38results about How to "Move up and down quickly" patented technology

The invention discloses a key structure. According to the key structure, a spring assembly composed of multiple springs connected in series supplies resilience force to a key cap. When the key cap moves towards a base of the key structure, one of the springs stops deformation after the key cap moves beyond a switching position, so that the elastic coefficient of the whole spring assembly is increased, and elasticity of the spring assembly can be enhanced. As a result, a user will feel feedback force which is light at first and heavy later in the process of pressing the key cap. The characteristic of the feedback force enables the user to press the key cap quickly, and the key cap can quickly rebound after being pressed. Further, a laterally actuated switch can be applied to the key structure, and influences of the resilience force of the switch on up-down action of the key cap can be reduced.

The invention discloses a semi-automatic vegetable seedling planter, belonging to the technical field of agricultural machinery. The semi-automatic vegetable seedling planter mainly comprises a seeding device, a conveyor belt, a frame, a cam A and a cam B, wherein the seeding device is located on the front end of the frame; the conveyor belt is installed on the upper surface of the frame and conveys vegetable seedlings to the seeding device for automatic seeding; and the process of seeding is mainly implemented through up-and-down movement of the seeding device under the co-action of the cam Aand the cam B and the seedling conveying of the conveyor belt. The semi-automatic vegetable seedling planter of the invention has the beneficial effects that the step of digging is omitted; rapid sowing of the vegetable seedlings is realized; labor force can be reduced; and time can be saved.

The invention relates to a loading and unloading vehicle and particularly relates to the loading and unloading vehicle suitable for rapidly replacing a battery box of a pure electric vehicle. A height regulating mechanism is connected on an outer vehicle body, a movable box body is arranged on the height regulating mechanism and rolling wheels are respectively arranged on the periphery of the movable box body; and baffle plates of the movable box body are respectively arranged on the two sides of the upper end of the movable box body, a push-pull rod is connected on the outer vehicle body, side baffle plates of the outer vehicle body are respectively arranged on the two sides of the outer vehicle body, and wheels are arranged at the bottom of the outer vehicle body. The loading and unloading vehicle can control the movable box body to move up and down, the height can be regulated flexibly, electricity utilization is not required, the loading and unloading vehicle is suitable for the electric vehicles in different types, the structure is simple, the operation and the maintenance are convenient, and the loading and unloading vehicle can be used for transportation of batteries of theelectric vehicles in different heights, realize the rapid loading and unloading of the power battery box and improve the stability of the whole vehicle. The product according to the invention can push the large-scale commercial development of the pure electric vehicles and further has social and economic benefits with better prospects.

The invention provides a carrying head of electronic components, which can realize stroke movement of suction nozzle and high accuracy carrying load control. The carrying head includes a movable part moving along the up and down direction by using the Z axis; a suction nozzle shaft capable of rotating around the axis and movably supported on the movable part; a pressuring shaft for pressing the suction nozzle shaft downward corresponding to the movable part; and a load sensor, for detecting load acted on the suction nozzle shaft when pressing is proceeded through the pressing shaft, wherein the detection shaft for making the load sensor face downward, configured offset to the suction nozzle in relative, and at the same time continuously formed on lower part of the pressing shaft, the suction nozzle shaft is connected with the load arm through bearings, and the load arm is locked with the load sensor at the same time, and the load arm is pressed by the load sensor pressed by the pressing shaft, such that the suction nozzle shaft pressing downward.

The invention discloses a linear vibrator. An upper-end fixation part includes an upper case and a first permanent magnet fixed with the upper case. A lower fixation part consists of a lower case, a flexible circuit board, and a second permanent magnet fixed to the lower case. A vibration part includes an elastic part, a hollow coil, a metal plate and a mass body; the elastic part enables the vibration part and the upper case to be connected mutually; the upper case and the lower case form a housing of the linear vibrator to provide internal space. The first permanent magnet and the second permanent magnet are opposed to the upper and lower end surface of the hollow coil respectively and the magnetic properties of the first permanent magnet and the second permanent magnet are identical with the magnetic property of a magnetic pole opposite to the hollow coil. The mass body is arranged at the periphery of the hollow coil; a metal body is arranged in the hollow coil; an external power supply is inputted into the coil by a flexible circuit board; and when the coil is electrified, the metal body becomes an electromagnet. According to the linear vibrator, the metal body inserted into the hollow coil serves as the electromagnet and interacts with the permanent magnets, so that the vibration part moves up and down rapidly to make vibration.

The invention discloses manual lake water wave power generation equipment which comprises an acting device and a power generation device. The acting device is arranged on a lakeside or a riverside. The power generation device is connected with the acting device. The acting device comprises a limiting sleeve fixed to the bulkhead wall. A floating pole is arranged inside the limiting sleeve. The power generation device comprises a cutting coil and a magnet device. A rotating shaft is arranged on the cutting coil. The rotating shaft is fixedly arranged relative to the floating pole. A gear is arranged on the rotating shaft. A gear rack matched with the gear is arranged on the floating pole. Compared with the prior art, the manual lake water wave power generation equipment has the power generation mode that the floating pole floats upwards or sinks downwards under the effect of water waves to drive the cutting coil to rotate and cut magnetic induction lines for power generation, the power generation mode is more environment-friendly, suitable for residents on the lakeside or the riverside, and damages caused by waves to bulkhead wall buildings can be reduced due to large-scale construction.

The invention provides a fuel gas pipeline control valve based on the Internet of Things. The fuel gas pipeline control valve based on the Internet of Things comprises a fuel gas pipeline, a pipeline fixing block, a first connecting body, a bolt, a control valve of the Internet of Things, a flow meter and a control terminal of the Internet of Things. The pipeline fixing block and the first connecting body are arranged on the fuel gas pipeline and are fixedly connected. The first connecting body is connected with a second connecting body through the bolt. The second connecting body is connected with an intermediate. A spinning shaft is arranged on a spinning valve block and connected with a spinning device. The spinning device is connected with a spinning controller. The spilling controller is connected with the control terminal of the Internet of Things through a wire. A flow guiding body is connected with a flow guiding tail end body which is connected with a flow meter statistical meter. Compared with the prior art, the fuel gas pipeline control valve based on the Internet of Things has the beneficial effects of being compact in structure, high in safety performance, accurate in flow metering and signal transmission and fast and accurate in valve control.

The invention relates to the technical field of electric power, and discloses an equipment mounting seat for a power supply department. The equipment mounting seat comprises a supporting plate. Sliding sleeves are arranged on the left side and the right side of the supporting plate, the upper portions of the sliding sleeves are slidingly connected with the lower portions of first sliding rods, theupper portions of the first sliding rods are slidingly connected to the lower portions of second sliding rods, the upper ends of the second sliding rods are fixedly connected with the lower surface of a supporting plate, the lower portions of the sliding sleeves are slidingly connected to the left side and the right side of a bottom plate, bearing seats are arranged on the left side and the rightside of the lower surface of the bottom plate, the middles of the bearing seats are rotationally connected with the left end and the right end of a lead screw, the left side and the right side of thelead screw are in threaded connection to the middle of a fixing plate, and the front end and the rear end of the fixing plate are fixedly connected with the middles of first sliding blocks. Accordingto the equipment mounting seat for the power supply department, through the arrangement of pull rods, height adjusting of the device can have two ranges, the range of the maximum height is widened, and the device is more convenient to use.

The invention relates to the technical field of heating devices, in particular to a heating device for a physical test. The heating device comprises a base, wherein a T-shaped groove is formed in thecenter of the upper side of the base; a T-shaped threaded rod is rotationally arranged in the T-shaped groove; a rotary switch is arranged on the outer side of the T-shaped threaded rod in a sleevingmanner; a threaded pipe is arranged on the outer side of the upper end of the T-shaped threaded rod in the sleeving manner; a putting board is fixedly supported at the upper side of the threaded pipe;limiting plates are fixed at two ends of the upper side of the base; sliding rails are respectively arranged at certain sides, which are opposite to each other, of the limiting plates; sliding blocksare arranged in the sliding rails in a sliding manner; in addition, the other sides of two sliding blocks are respectively fixed at two sides of the putting boards; a limiting mechanism is arranged at the upper side of the putting board; a supporting plate is fixed at the upper ends of the two limiting plates; a heating hole is formed in the center of the upper side of the supporting plate in a penetrating manner; a threaded rod is fixed at one end of the upper side of the supporting plate; a threaded sleeve is arranged on the threaded rod in a sleeving manner. The heating device disclosed bythe invention has the advantages that the position of an alcohol lamp can be quickly adjusted, a heating object can be able to contact with the outer flame of the alcohol lamp and the heating efficiency is improved.

The invention relates to a position line drawing device, in particular to a device for assisting in drawing a position line for shoemaking. The technical problems that a device for assisting in drawing a position line for shoemaking is large in labor capacity, low in accuracy and complex in operation need to be solved. In order to solve the above-mentioned technical problems, the device for assisting in drawing the position line for shoemaking is provided. The device comprises a placing table, an assisting plate, connecting rods, a guide plate, fixed stop dogs, a chuck, an electric push rod, a motor, a left bearing pedestal, a nut, a lead screw, a fixed plate, a right bearing pedestal, a rotating shaft, a rack, a gear, a sliding block and a sliding rail, the fixed plate is arranged above the placing table, and the bottom of the fixed plate is provided with the motor, the left bearing pedestal and the right bearing pedestal in sequence from left to right. According to the device for assisting in drawing the position line for shoemaking, the effects of being small in labor capacity, high in accuracy and easy to operate are achieved, a smooth and horizontal straight line can be well drawn, and the device can rapidly move up and down to reduce the operation time.

The invention discloses a key structure, providing resilience for a keycap by using a spring set composed of a plurality of springs in serial connection; when the keycap moves toward a base of the key structure and after the keycap exceeds a shift position, one spring stops continuously deforming; therefore, elasticity coefficient of the whole spring set increases, and elastic energy storage of the spring set can be increased; as a result, when a user presses the keycap, feedback force light and then great may be perceived; the feedback force is characteristically helpful for the user to press the keycap quickly, and the keycap may return quickly after being pressed; furthermore, the key structure may employ a lateral-acting switch, and the influence of resilience of the switch upon vertical movement of the keycap; the key structure may also employ a spring plate arranged below a keycap, and tactile feedback may be provided for a user to a the switch.

The invention discloses a rapid polishing device for communication device production. The device comprises a bottom plate and a second holding clamp. A bearing block is fixed to the outer wall of thetop of the bottom plate through a bolt, a motor mounting groove is formed in the outer wall of the top of the bearing block, the inner wall of the bottom of the motor mounting groove is fixedly provided with a motor through a bolt, a connecting plate is welded to the top end of an output shaft of the motor, a first annular groove is formed in the outer wall of the top of the bearing block, balls distributed at equal distances are placed in the first annular groove, second annular grooves distributed at equal distances are formed in the outer wall of the bottom of the connecting plate, a firstholding clamp is fixed to the outer wall of the top of the connecting plate through a bolt, and two polishing devices are arranged on the outer wall of the top of the bottom plate. Equipment is tightly fixed to the device, a motor can more rapidly rotate, t he polishing speed of the device is increased, the effective polishing area of the device is effectively increased, under the same rotating speed, the polishing degree of the device is higher than that of other devices, and the polishing rate of the device is improved.

The invention relates to a building external wall water seepage testing device for building supervision. The device comprises a detection frame and a water supply device mounted on the detection frame;the detection frame comprises mounting rods;a spraying pipe is mounted between the two mounting rods; spraying holes are formed in the side face, close to the wall, of the spraying pipe. The water supply device comprises a watering tank and a water pump; a water inlet of the water pump is connected with the watering tank; a water outlet of the water pump is connected with a water outlet pipe; theother end of the water outlet pipe is connected with the spraying pipe; a height adjusting device is mounted on the detection frame; the height adjusting device comprises two adjusting cross rods andtwo adjusting chains; the two ends of the adjusting cross rod are fixedly connected with the two adjusting chains respectively; the two adjusting chains are parallel to each other and perpendicular to the adjusting cross rod, an adjusting cylinder is fixedly installed on the mounting rod, the adjusting chains are arranged in the adjusting cylinder in a penetrating mode, an adjusting motor is fixedly installed on the mountingrod, and an adjusting chain wheel meshed with the adjusting chains is fixedly installed on an output shaft of the adjusting motor. The structure is stable, and falling offfrom the wall body is not prone to happening.

The invention discloses a mold of an electronic equipment shell. The mold comprises a base box. A damping device is fixedly connected with the right side of an inner cavity of the base box. A first motor is fixedly connected with the top of the damping device. An output shaft of the first motor is fixedly connected with a rotating shaft by a coupler. One end of the rotating shaft is rotatably connected with the left side of the inner cavity of the base box by a bearing. The outer surface of the rotating shaft is fixedly connected with a D-shaped roller. The top of the base box is fixedly connected with a thermal insulation plate. The top of the thermal insulation plate is fixedly connected with a fixed mold. The fixedly mold is internally provided with an fixed mold cavity. The bottom of the fixed mold cavity is in sliding connection with a mold ejecting plate. The invention relates to the technical field of mold manufacturing. According to the mold of the electronic equipment shell, the fixed mold can quickly push out a shaped mold through the mold ejecting plate, depanning speed is high, depanning efficiency is improved, labor is reduced, manual shaped mold taking out is not required, automation is high, and benefits of a factory are increased.

The invention relates to a water seepage test device for building exterior walls for building supervision, comprising a detection frame and a water supply device installed on the detection frame. The detection frame includes installation rods, and a spray pipe is installed between the two installation rods. There are spray holes on the side near the wall. The water supply device includes a sprinkler tank and a water pump. The water inlet of the water pump is connected with the sprinkler tank, and the water outlet of the pump is connected with a water outlet pipe, and the other end of the water outlet pipe is connected with the spray pipe. A height adjustment device is installed on the detection frame. The height adjustment device includes two adjustment bars and two adjustment chains. The two ends of the adjustment bars are respectively fixedly connected with the two adjustment chains. On the adjusting crossbar, an adjusting cylinder is fixedly installed on the mounting rod, the adjusting chain is penetrated in the adjusting cylinder, an adjusting motor is fixedly installed on the mounting rod, and the output shaft of the adjusting motor is fixedly installed with an adjusting sprocket engaged with the adjusting chain. Its structure is stable, and it is not easy to fall off the wall.

An adjustable locking pulley device comprises a fixing plate structure, a first adjusting structure, a second adjusting structure and a pulley structure, the fixing plate structure comprises a fixingplate, a groove and a first through hole are formed in the fixing plate, and the first adjusting structure comprises a first piston, a fixing rod, a connecting frame, a second pipeline and a second valve which are arranged in the groove. The two pulleys are arranged to stably support a single corner on the upper surface of the door body, the two pulley structures are arranged at the upper ends ofthe two driving rods which are arranged in the crossed mode and are in pivot connection with each other respectively, and meanwhile the lengths of the upper sections, located above the pivot connection position, of the two driving rods are equal. The length of the upper section below the pivot connecting position is equal to that of the lower section below the pivot connecting position, so that the up-down moving distances of the two pulleys are equal, the two pulleys abut against a guide rail above the door body at the same time in the installation process, and the two pulleys are stressed evenly.

The invention discloses a quick disassembling device for a chain. The quick disassembling device for the chain comprises a support base and a support block; the support base comprises an upper support plate, a lateral plate and a bottom plate; a through hole is formed in the upper support plate; a guide sleeve is arranged in the through hole; a countersink is formed in the bottom plate; a bushing is arranged on the countersink; a plurality of permanent magnets are arranged on the bushing in an embedded manner; the upper end faces of the permanent magnets are flush with the upper end face of the bushing; the central axis of the countersink is collinear with the central axis of the through hole in the support plate; a rotary handle is arranged at the upper part of the support block; the rotary handle is rotatably connected with the support block; a sliding groove is formed in the lower part of the support block; a sliding block is arranged on the support block; a sliding block matched with the sliding groove is arranged on the back of the sliding block; a connecting rod is arranged between the sliding block and the rotary handle; the rotary handle, the connecting rod, the sliding block and the support block form a crank sliding block mechanism; an ejector pin is arranged at the bottom of the sliding block; and the ejector pin and the sliding block are detachably connected. According to the quick disassembling device for the chain, disclosed by the invention, the defects of low efficiency and low safety coefficient in disassembly of the chain in the prior art are overcome.

The invention relates to a circulating fluidized bed slagging pipe device and a dredging method. In the present, a power plant generally utilizes a site manual slag poking mode to solve the problem that a slagging pipe is plugged; generally, two operators must be needed to be specially responsible for operation in site; in the moment, slag spray, bed material self flow and other abnormal phenomenaendangering personal safety are prone to happening; an operation environment is severe, labor intensity is large, and labor cost is high; furthermore, overhaul efficiency for boiler shutdown caused by plug is higher, and safety and economy of a boiler are poorer. The circulating fluidized bed slagging pipe device disclosed by the invention comprises a slagging pipe (1), a hole is formed in the upper part of the slagging pipe, a connection pipe (5) is welded in the hole, the upper part of the connection pipe is in angle welding to a sealing device (21), the sealing device is connected with a slag breaking device (22), the slag breaking device is fixed to a fixed frame (2), and the fixed frame is respectively fixed to the ground and the connection pipe. The slagging pipe device and the dredging method disclosed by the invention are applied to a circulating fluidized bed.

The invention discloses a water-flow cleaning type blackboard, which comprises a board surface, guide rails are installed on the left and right sides of the board surface, a blackboard eraser device is installed above the guide rail, and a controller is installed on the right side of the guide rail. A water storage tank is installed above the board surface, and a water pump is installed inside the water storage tank, and the lower surface wall of the water storage tank is provided with a water spray port, and a screen is installed below the board surface, and a screen is installed under the screen. A sump is installed. Compared with the traditional blackboard, the water-cleaning blackboard is equipped with a water storage tank and a water spray port above the board surface to spray water on the chalk characters on the surface of the board surface, which is convenient for wiping with a cloth, and at the same time avoids chalk characters due to Wipe and the dust flies. By installing a dry erase box and a wet erase box in the blackboard eraser, different operations can be performed on the blackboard to ensure that the blackboard is cleaner. Through the buckle installed on the right surface wall of the wet wiping box, the wiping cloth can be taken out for cleaning to ensure the cleanliness of the blackboard.

The invention discloses a cutting device used in the production of bed sheets, which comprises a bracket, a sliding sleeve is sleeved at both ends of the bracket, a rotating shaft is fixedly welded on one side of the outer wall of the sliding sleeve, and a rotating shaft is connected to the rotating shaft. A bead, a spring is welded between the bead and the sliding sleeve, a transmission plate is movably installed between the two supports, a bed sheet is arranged on the upper end of the drive plate, and the bed sheet is fixed on the drive plate through the bead, the two The rear end of the bracket is connected with a crossbeam, and a sliding cutting machine is sleeved on the crossbeam. The bottom end of the sliding cutting machine is provided with a sliding port, and a motor is welded on the inner wall of the bottom end of the sliding cutting machine. The output shaft of the motor A cam is fixedly sleeved on the top, and a support column is fixed on the inner wall of the bottom of the sliding cutting machine. A slideway is opened on one side of the outer wall of the support column. The sliding to the top is connected to a pulley, and the pulley is welded with Fixed column. The invention has simple structure and reasonable design, and greatly improves the cutting efficiency.

The invention belongs to the field of bridge construction, and particularly relates to crack pouring auxiliary equipment for bridge construction; the equipment comprises a fixing block, a handle is fixedly connected to the rear side wall of the fixing block, mounting grooves are formed in the two side walls of the fixing block, and first electric push rods are fixedly mounted in inner cavities of the mounting grooves. The outer end of a piston rod of each first electric push rod is fixedly connected with a connecting plate. The first electric push rods can drive two sets of blades to be adjusted to adapt to the width of an expansion joint, the blades are attached to the inner surface of a steel plate, then an electromagnet is started, the direction of current introduced into the electromagnet is continuously changed, so that the suction force and thrust force on a magnet block can be rapidly and alternately generated; the blades can be driven to quickly move up and down, so that the blades can be attached to the steel plate to quickly remove the bonded joint mixture, the operation is convenient and quick, and compared with manual removal in the past, more labor is saved, the efficiency is remarkably improved, and meanwhile, the adaptability is high.

Disclosed is a handling trolley usable for fast exchange of purely electric vehicle battery boxes, wherein a height adjusting mechanism (5)is connected to an external trolley body (4), the height adjusting mechanism (5) is provided thereon with a movable case body (1), the movable case body (1) is provided on a circumference thereof with rollers (3); the movable case body (1) is provided respectively at both sides of an upper end with a movable case body fender (20), a push / pull bar (8) is connected onto the external trolley body (4), the external trolley body (4) is provided respectively at both sides thereof with an external trolley body side fender (2), and the external trolley body (4) is provided at the bottom with trolley wheels (7). The handling trolley is able to control the movable case body (1) to move up and down, has a flexibly adjustable height and no electricity consumption, thus being suitable for various kinds of electric vehicles, has a simple structure, convenient operation and maintenance, thus being usable for carrying electric vehicle batteries having various heights, and achieves fast loading and unloading of battery boxes, being able to improve the stability of the vehicle as a whole.

The invention provides a carrying head of electronic components, which can realize stroke movement of suction nozzle and high accuracy carrying load control. The carrying head includes a movable part moving along the up and down direction by using the Z axis; a suction nozzle shaft capable of rotating around the axis and movably supported on the movable part; a pressuring shaft for pressing the suction nozzle shaft downward corresponding to the movable part; and a load sensor, for detecting load acted on the suction nozzle shaft when pressing is proceeded through the pressing shaft, wherein the detection shaft for making the load sensor face downward, configured offset to the suction nozzle in relative, and at the same time continuously formed on lower part of the pressing shaft, the suction nozzle shaft is connected with the load arm through bearings, and the load arm is locked with the load sensor at the same time, and the load arm is pressed by the load sensor pressed by the pressing shaft, such that the suction nozzle shaft pressing downward.

The invention provides an automatic medicine pounding machine. The machine comprises a support, a storage battery, a fixed cylinder, a cover, a first rotating motor and a second rotating motor, the storage battery is located at the rear side of the support, the storage battery is fixedly mounted to the support, the fixed cylinder is located in the middle position of the support, the fixed cylinderis movably connected with the support, the cover is located above the internal of the fixed cylinder, the outer circumference of the cover is attached to the inner wall of the fixed cylinder, the first rotating motor is located at the rear side of the top of the support, the first rotating motor is fixedly mounted to the support, the second rotating motor is located above the front side of the support, the second rotating motor is fixedly mounted to the support, a movable cylinder is matched with the fixed cylinder, and the inner wall of the movable cylinder is provided with convex fine and close lines. A crushed medicine can be separated from the fixed cylinder by the movable cylinder, so time waste and medicine waste caused by removal of the medicine from the deep bottom of the fixed cylinder are avoided, and the automatic medicine pounding machine is suitable for the production and use, and has a good prospect.

The invention discloses a machine head pelletizing device for a screw extruder. The machine head pelletizing device comprises a machine body and further comprises a cooling mechanism, a driving mechanism and a pelletizing mechanism, wherein, the cooling mechanism is connected to the upper portion of one side of the machine body through bolts, the driving mechanism is arranged between the machine body and the cooling mechanism, the pelletizing mechanism is arranged in the machine body, and the output end of the pelletizing mechanism is attached to one end, inserted into the machine body, of the cooling mechanism for use. According to the machine head pelletizing, the problems that a large amount of dust is attached to the surface of a formed material whether the material is subjected to air cooling or water cooling in the prior art, and cleanliness of a pelletized product cannot be guaranteed are solved; a structure of the pelletizing device is improved and optimized, so that the pelletizing device can conveniently guide materials, the environment around the materials can be cooled while the materials are guided, the materials are assisted to be rapidly cooled, the extruded and molded materials can be conveniently cooled and solidified, and the materials are conveniently pelletized.

The intelligent settlement table comprises a box body, a box door is installed on the front face of the box body through hinges, a bearing table is arranged on the side face of the box body, a control switch is arranged on the surface of the bearing table, a power source is arranged on the side face of the control switch, a storage plate is arranged at the top of the bearing table, and a through hole is formed in the top of the box body. A through hole is formed in the box body, a sliding table is clamped in the through hole, a positioning seat is arranged at the top of the sliding table, a face recognition camera is installed on the side face of the positioning seat, an intelligent settlement touch screen is installed at the top of the positioning seat through a support, a bottom plate is arranged in the box body, a bearing seat is arranged at the top of the bottom plate, and a rotating shaft is arranged on the upper side of the bearing seat. The settlement table is scientific and reasonable in structural design, the height of the settlement equipment can be simply and quickly adjusted, so that the requirements of different users are met, the settlement table can be well protected, and the service life of the settlement table is prolonged.

The invention discloses an underground fire fighting device with double water outlets which is easily buried.The device comprises a box body, a fixing frame and a plug body, the bottom of the box bodyis fixedly connected with the fixing frame, a cavity is formed in the fixing frame, a driving motor is fixedly mounted on the bottom of the cavity, an outlet shaft of the driving motor is fixedly connected to one end of a screw rod, an inner wall of the fixing frame is movably connected with a movable block,the top end of the movable block is fixedly provided with the plug body, the other end ofthe screw rod penetrates through the movable block,thescrew rod is in screwed connection with the movable block, and connecting blocksare fixedly connected to the left and right sides of the fixing frame. The underground firefighting device drives the up-and-down movement of the movable block and the plug body thereon by the forward and reverse rotation of the screw rod, so that the up-and-down movement of the plug body is not only very rapid, but also very stable.