248results about How to "Prevent accidental electric shock accidents" patented technology

The invention discloses bridge equipment comprising a matrix arranged above a base and an upper frame arranged above the matrix, wherein a fourth driver is arranged at the bottom in the base, the top of the fourth driver is connected with a rotary column, an extension end at the top of the rotary column penetrates through the inner wall of the base and is fixedly connected with an end face of the bottom of the matrix, a bearing is fixedly arranged between the matrix and the base, an accommodation cavity is formed in the matrix, a first hollow groove and a second hollow groove are formed in the matrix at the top of the accommodation cavity, a chute is formed in a top wall in the first hollow groove, a fetching groove is formed in an outer wall of the matrix on the right side of the accommodation cavity, a through groove and a clamping groove are formed between the fetching groove and the accommodation cavity, a rotating shaft arranged to extend up and down is arranged in the accommodation cavity, an extension segment at the top of the rotating shaft penetrates through the inner wall of the matrix and stretches into the first hollow groove, a first toothed wheel is fixedly arranged at the tail of the rotating shaft in the first hollow groove, a reel is fixedly arranged on the rotating shaft in the accommodation cavity, conducting wires are wound on the reel, a slide block is arranged in the chute, the bottom of the slide block stretches into the first hollow groove, and a first driver is arranged in the end face at the bottom of the slide block. The bridge equipment disclosed by the invention has the advantages of simple structure, convenient operation, capability of realizing automatic take-up and high safety.

The invention discloses a vehicle charging device of solar power supply control. The device comprises an engine body fixed on a protection base and a weather enclosure arranged above the engine body, the engine body is internally provided with an accommodation cavity, the engine body at the top of the accommodation cavity is internally provided with a first cavity body and a second cavity body, the inner top wall of the first cavity body is provided with a slide groove, the outer wall of the engine body at the right side of the accommodation cavity is internally provided with an operation groove, a through hole and a clamping groove are formed between the operation groove and the accommodation cavity, the accommodation cavity is internally provided with a rotary shaft extending up and down, the extending section of the top portion of the rotary shaft penetrates through the inner wall of the engine body and extends into the first cavity body, the tail end of the rotary shaft in the first cavity body is fixedly provided with a first gear, the rotary shaft in the accommodation cavity is provided with an accommodation disc in the circumferential direction of the rotary shaft, a charging line twines in the accommodation disc, a sliding block is arranged in the sliding groove, the bottom of the sliding block extends into the first cavity body, and the end surface of the bottom of the sliding block is internally provided with a first motor. The vehicle charging device of solar power supply control is simple in structure and convenient to operate, can conduct wire collection work automatically, and is high in safety.

The invention discloses an electric-shock-proof LED lighting lamp with automatic plug-in power supply, which comprises a lamp holder body and an LED lamp cap assembly for matching and connecting with the lamp holder body. A first cavity is arranged inside the lamp holder body. The rotating sleeve is connected with the rotating sleeve, and the inside of the right side of the rotating sleeve is provided with an internal thread cavity, and the internal thread cavity is provided with a moving block that is threaded and connected, and the right end surface of the moving block is fixed with a connecting rod extending to the right. The upper and lower sides of the connecting rod are symmetrically provided with the first chute. A motor is embedded in the inner wall on the left side of the first cavity. The side inner wall is symmetrically provided with grooves, each groove is equipped with a gear and the lamp holder on the left side is equipped with a second cavity, and the opposite side of the second cavity is equipped with a second chute, the second cavity The body is provided with a sliding block extending into the second chute.

The invention discloses a new energy automobile charging interface safe in power supply and a charging device. The charging device comprises a charging pile and the automobile interface. A take-up cavity is formed in the charging pile. An operating groove is formed in the outer end face, on the right side of the take-up cavity, of the charging pile. A through hole is formed between the operating groove and the take-up cavity. A first sliding groove with the top communicating with the take-up cavity is longitudinally formed in the inner bottom wall of the right side of the take-up cavity. A second sliding groove is transversely formed in the middle of the first sliding groove in a penetrating mode and communicates with the first sliding groove. A rotating shaft is longitudinally arranged in the take-up cavity. The top of the rotating shaft is connected with a take-up motor in a power fit mode. A take-up reel is fixedly and circumferentially arranged on the rotating shaft. A charging line is wound on the take-up reel. A charging gun is arranged in the operating groove. A plug used for being in plugging fit with the through hole is arranged on the left side end face of the charging gun. The left side end face of the plug is fixedly connected with the charging line. A connecting block is arranged in the charging gun. A protruding block is arranged on the right side end face of the connecting block. The charging device is simple in structure, convenient to operate, stable in connection and high in safety.

The invention discloses an advertisement display screen device. The advertisement display screen device comprises a base and a display screen, wherein the base is composed of a push part and a power connection part, and the display screen is used for being connected with the base in a matched mode. A first transmission cavity is formed in the bottom of the lower right end of the push part, a first screw rod is arranged in the first transmission cavity, the right side end of the first screw rod is connected with a first motor in a transmission mode, a sliding lock part is arranged on the first screw rod and connected with the first screw rod in a screw thread fit mode, a second transmission cavity is formed in the sliding lock part, a second screw rod is arranged in the second transmission cavity, the right side end of the second screw rod is connected with a second motor in a transmission mode, an installation groove is formed in the bottom of the second transmission cavity, a cavity is formed in the portion, on the left side of the installation groove, of the sliding lock part, a push block is arranged in the cavity, the upper portion of the push block penetrates into the second transmission cavity and is in screw thread fit with the second screw rod, a placement groove is formed in the portion, on the right side of the installation groove, of the sliding block part, a clamping groove is formed in the lower end of the placement groove, and a guide groove is formed between the clamping groove and the installation groove.

The invention discloses a new-energy-automobile charging device. The new-energy-automobile charging device comprises a pile seat and a plug connected with an electric automobile. A protruding part is integrally arranged at the top end of the pile seat, a first sliding chute extending left and right is formed in the pile seat, and a gear groove is formed in the position, located at the left end of the first sliding chute, in the pile seat; and a turbine groove extending upwards into the protruding part is further formed in the pile seat, a baffle groove transversely penetrating left and right and communicating with the turbine groove is formed in the protruding part, and a baffle plate is arranged in the baffle groove in a left-right sliding mode. According to the new-energy-automobile charging device, the whole structure is simple, power supply is safe and reliable, and operational manipulation is simple and convenient; electric shock accidents caused by plug inserting and pulling are effectively reduced, the life safety of people is ensured, and sudden break-off of electric automobile charging caused by accidental-kicking of the people can be avoided; and the service life of an accumulator in the electric automobile is effectively prolonged, energy saving and environmental protection are achieved, and the new-energy-automobile charging device is suitable for being popularized and used.

The invention discloses a high-safety electric power supply device, including a power supply base formed by an execution part and a power supply part and a plug piece used for being matched and connected with the power supply base, the bottom of the lower right side of the execution part is provided with a first sliding groove, a first screw is arranged in the first sliding groove, the right side end of the first screw is in power connection with a first motor, the first screw is provided with locking guide sliding blocks connected therewith in a screw-thread fit mode, a second sliding groove is arranged in the locking guide sliding block, a second screw is arranged in the second sliding groove, the right side end of the second screw is in power connection with a second motor, the bottom of the second sliding groove is provided with an installation groove, an accommodating cavity is arranged in the locking guide sliding block at the left side of the installation groove, a movable locking piece is arranged in the accommodating cavity, the top of the movable locking piece stretches into the second sliding groove and is in screw-thread fit with the second screw, a placing cavity is arranged in the locking guide sliding block at the right side of the installation groove, the lower side of the placing cavity is provided with a clamping groove, and an inclined plane guide sliding groove is arranged between the clamping groove and the installation groove.

The invention discloses an automatic plug-in LED lighting lamp, which comprises a lamp holder body and an LED lamp cap assembly for matching and connecting with the lamp holder body. A first cavity is arranged inside the lamp holder body, and the inside of the first cavity is rotatably fitted and connected. There is a rotating sleeve, the right side of the rotating sleeve is provided with an internal thread cavity, and the internal thread cavity is provided with a moving block that is threaded and connected, and the right end of the moving block is fixed with a connecting rod extending to the right. The first chute is symmetrically arranged on both sides. A motor is embedded in the inner wall on the left side of the first cavity, and a rotating shaft is connected to the power on the right side of the motor. The end surface on the right side of the rotating shaft is fixedly connected with the rotating sleeve. There are grooves, each groove is equipped with a gear and the lamp holder on the left is provided with a second cavity, the opposite side of the second cavity is provided with a second chute, and the second cavity is provided with a The sliding block that extends into the second chute.

The invention discloses a new energy vehicle charging device adopting solar energy power supply control. The new energy vehicle charging device comprises a machine body fixed at the top of a protective pedestal and a rain-proof shed arranged above the machine body. A containing cavity is formed in the machine body, and a first cavity and a second cavity are formed in the position, inside the machine body, at the top of the containing cavity. A sliding groove is formed in the inner top wall of the first cavity, and an operating groove is formed in the position, inside the outer wall of the machine body, of the right side of the containing cavity. A through hole and a clamping groove are formed between the operating groove and the containing cavity, and a rotary shaft arranged in a vertically extending mode is arranged in the containing cavity. An extending section at the top of the rotary shaft penetrates through the inner wall of the machine body and stretches into the first cavity, and a first gear is fixedly arranged on the position, inside the first cavity, at the tail end of the rotary shaft. A containing disc is fixedly arranged on the position, inside the containing cavity, on the rotary shaft in the circumferential direction. A charger cable is wound inside the containing disc, and a sliding block is arranged inside the sliding groove. The bottom of the sliding block stretches into the first cavity, and a first motor is arranged in the end face of the bottom of the sliding block. The new energy vehicle charging device adopting solar energy power supply control is simple in structure, convenient to operate, capable of conducting automatic winding and high in safety.

The invention discloses a new energy automobile charging device with a protection function. The device comprises a pile body, an electricity connection cavity, a first transmission cavity, a second transmission cavity, a third transmission cavity and a wire retraction cavity are formed in the pile body, an operation cavity and a sealing cavity with the openings facing right are formed in the rightend surface of the pile body, and a charging gun placing cavity is communicated with the left end of the sealing cavity; a sliding block capable of transversely sliding is arranged in the electricityconnection cavity, an upper power supply block and a lower power supply block are arranged on the right end wall of the electricity connection cavity, and an upper electricity connection hole matchedwith the upper power supply block and a lower electricity connection hole matched with the lower power supply block are formed in the right end surface of the sliding block. The device is simple in structure, wire retraction and release work of a charging wire can be well achieved, the problem that the charging wire is exposed outside the charging device and damaged is avoided, and closing and opening of the charging gun placing cavity can be selectively controlled through an operation hand wheel; operation is easy and convenient, the safety is high, and the risk of an electric shock in the operation process is greatly reduced.

The invention discloses an LED illumination lamp easy to install. The LED illumination lamp easy to install comprises a fixing seat and an installation part, wherein the fixing seat is composed of an upper seat body and a lower seat body, and the bottom of the installation part is provided with an LED lamp cap. An insertion connecting cavity extending downwards is formed in the middle position of the interior of the upper seat body, and the bottom of the insertion connecting cavity penetrates the lower seat body. A partition plate is arranged on the inner top wall of the insertion connecting cavity, and first sliding cavities are formed in the positions, on the left side and the right side of the partition plate, in the upper seat body. Containing cavities are formed in the bottoms of the first sliding cavities. Second sliding cavities are formed in the positions, at the bottoms of the containing cavities, in the lower seat body. First sliding blocks are arranged in the first sliding cavities, and electrifying holes are formed in the inner sides of the bottoms of the first sliding blocks. First rack parts are arranged at the positions, on the outer sides of the electrifying holes, at the bottoms of the first sliding blocks. Gears connected with the bottoms of first rack parts in an engaged manner are arranged in the containing cavities. Second sliding blocks are arranged in the second sliding cavities. The outer sides of the second sliding blocks are provided with slope locking rods which penetrate the lower seat body and are connected in a sliding fit manner. The sides, away from the slope locking rods, of the second sliding blocks are provided with slope protruding parts, and the top end faces of the second sliding blocks are provided with second rack parts connected with the bottoms of the gears in an engaged manner.

The invention discloses an automobile charging pile comprising a supporting column, a unit body and a lifting protective cover, wherein the unit body is fixed to the top of the supporting column, and the lifting protective cover is arranged on the outer side of the top of the unit body. A first cavity is formed in the unit body; a second cavity is formed in the part, on the right side of the first cavity, of the unit body; a first sliding cavity is formed in the part, above the left side of the first cavity, of the unit body, and a second sliding cavity is formed in the part, below the second cavity, of the unit body; a rotating shaft extending towards the left side and the right side is arranged in the first cavity; the extending section on the right side of the rotating shaft penetrates through the inner wall of the unit body and extends into the second cavity to be rotationally connected with the second cavity in a matched mode; baffles are arranged in the positions, in the first cavity, of the rotating shaft in a bilaterally-symmetrical mode; a charging wire is arranged in the position, between the baffles, on the rotating shaft in an embracing mode; a first wire is arranged inside the left side of the rotating shaft; the tail end of the left side of the charging wire is embedded into the rotating shaft and electrically connected with the first wire; and a conductive annular piece is arranged outside the baffle on the left side in an embracing mode. The structure is simple, operation is convenient, the charging wire can be automatically wound, meanwhile, safety is improved, and accidental electric-shock accidents are prevented.

The invention discloses a power supply device for electricity. The power supply device comprises a power supply seat and a plug piece, wherein the power supply seat comprises an execution part and a power supply part, the plug piece is used for connecting the power supply seat in a matching way, a first sliding groove is formed in the bottom of a right lower part of the execution part, a first screw rod is arranged in the first sliding groove, a right side end of the first screw rod is in power connection with a first motor, a locking guide sliding block is arranged on the first screw rod and is connected with the first screw rod in a screw-thread fit way, a second sliding groove is formed in the locking guide sliding block, a second screw rod is arranged in the second sliding groove, a right side end of the second screw rod is in power connection with a second motor, an installation groove is formed in the bottom of the second sliding groove, an accommodating cavity is formed in the locking guide sliding block at a left side of the installation groove, a mobile locking block is arranged in the accommodating cavity, the top of the mobile locking block extends into the second sliding groove and is in threaded matching with the second screw rod, a placement cavity is formed in the locking guide sliding block at a right side of the installation groove, a clamping groove is formed under the placement cavity, and an inclined surface guide sliding groove is formed between the clamping groove and the installation groove.

The invention discloses a convenient-to-install alternating current smoke detector device which comprises a fixed seat and an assembly part in fit connection with the fixed seat, wherein a first cavity is arranged in the fixed seat; a shell jacket is in running fit connection in the first cavity; an internal thread cavity is arranged in the right side of the shell jacket; a push block in threaded fit connection is arranged in the internal thread cavity; a push rod extending toward the right side is fixed on the right end surface of the push block; first slip grooves are correspondingly formed on the upper and lower sides of the push rod; a motor is arranged in the left inner wall of the first cavity; the right side of the motor is connected with a coupling shaft; the right end surface of the coupling shaft is fixedly connected with the shell jacket; placing grooves are correspondingly formed in the inner walls on the upper and lower sides of the first cavity; a gear wheel is arranged in each placing groove, and a second cavity is arranged in the left fixed seat; second slip grooves are formed on the upper and lower sides of the second cavity respectively; and a slip block penetrating into the second slip groove is arranged in the second cavity.

The invention discloses a high-efficiency welding device, which includes an electric welding machine and a connecting piece. The connecting piece is composed of a vertical pole, a container fixed on the top of the vertical pole, and a shell sleeve arranged outside the top of the container. One cavity, the container on the right side of the first cavity is provided with a second cavity, the container above the left side of the first cavity is provided with a first sliding cavity, and the container below the second cavity is provided with The second sliding chamber, the first chamber is provided with a rotating shaft extending to the left and right sides, the extended section on the right side of the rotating shaft penetrates the inner wall of the container and penetrates into the second chamber and is connected in operation. There are retaining columns on the left and right sides of the rotating shaft, cables are wound around the rotating shaft between the retaining posts, a first wire is arranged inside the left side of the rotating shaft, and the left end of the cable is embedded in the rotating shaft and electrically connected to the first wire. A guide ring is provided around the outer circle of the left retaining column; the invention is simple in structure, easy to operate, can automatically rewind the cable, improves safety at the same time, and prevents accidental electric shock accidents.

The invention provides an earthed telescopic meshed-type civil electrical connecting device as well as a plug and a socket thereof. The earthed telescopically-meshed civil electrical connecting device is particularly suitable for wired or wireless plugs, fixed or movable sockets, interconnecting couplers, appliance couplers and the like used for the indoor or outdoor. The earthed telescopically-meshed civil electrical connecting device comprises a rotary springback meshed-type electrical connecting plug and a rotary spirngback meshed-type electrical connecting socket, wherein the rotary springback meshed-type electrical connecting plug is provided with a metal contact A and the like, the rotary spirngback meshed-type electrical connecting socket is provided with a metal contact B and the like, and the metal contact A and the metal contact B are electrically connected through mutually meshing under the action of an earthed telescopic spring mechanism. The earthed telescopic meshed-type civil electrical connecting device has the advantages of wide application range, simple structure, simplicity and convenience in operation, reliable connection performance and capability of ensuring that earthed metal contacts are firstly connected, and then a firing line and a zero line are connected when the connecting device is spliced every time, ensuring that the firing line and the zero line are firstly disconnected, and then the earthed metal contacts are disconnected when the connecting device is pulled out, ensuring that the firing line and the zero line are uniform and reliable in contact pressure, ensuring safety and preventing accidental electric shock.

The invention discloses a new energy car charging device convenient for retracting and releasing wires. The device comprises a pile body, a power connection chamber, a first transmission chamber, a second transmission chamber, a third transmission chamber and a wire retracting chamber are formed in the pile body, the right end face of the pile body is provided with an operating chamber with an opening facing the right direction and a closed chamber, the left end of the closed chamber is communicated with a charging gun placement chamber, the power connection chamber is provided with a slidingblock capable of sliding to the left and right directions, an upper power supply block and a lower power supply block are arranged on the right end wall of the power connection chamber, and the rightend face of the sliding block is provided with an upper power connection hole cooperatively connected with the upper power supply block and a lower power connection hole cooperatively connected with the lower power supply block. The charging device has the advantages of being simple in structure, better achieves the retracting and releasing work of the charging wires and prevents the charging wires from being exposed outside the charging device to be damaged; and the opening and closing of the charging gun placement chamber can be selectively controlled by operating a hand wheel; and the charging device is simple and convenient to operate, has high safety, and greatly reduces the existing risks of electric shock during operation.

The invention discloses convenient bridge equipment. The convenient bridge equipment comprises a base body arranged above a base and a top frame arranged above the base body; a fourth driver is arranged at the bottom of the interior of the base; the top of the fourth driver is connected with a rotary column; an extension end on the top of the rotary column runs through the inner wall of the base and is fixedly connected with the bottom end plane of the base body; a bearing is fixedly arranged between the base body and the base; an accommodating cavity is formed in the base body; a first hollow groove and a second hollow groove are formed in the base body on the top of the accommodating cavity; a sliding groove is formed in the inner top wall of the first hollow groove; a fetching-taking groove is formed in the outer wall of the base body on the right side of the accommodating cavity; a through groove and a clamping groove are formed between the fetching-taking groove and the accommodating cavity; a rotary shaft which extends up and down is arranged in the accommodating cavity; an extension section on the top of the rotary shaft runs through the inner wall of the base body to extend into the first hollow groove; a first tooth-shaped wheel is fixedly arranged at the tail part of the rotary shaft in the first hollow groove; a reel is fixedly arranged on the rotary shaft in the accommodating cavity; a wire is wound in the reel; a sliding block is arranged in the sliding groove; the bottom of the sliding block extends into the first hollow groove; and a first driver is arranged in the bottom end plane of the sliding block. The convenient bridge equipment is simple in structure, convenient to operate, capable of collecting wires automatically, and high in safety.

The invention provides a circular lifting type solar energy charging pile, which comprises a driving system, a solar energy panel lifting system and a power system located in a shell. The solar energypanel lifting system comprises multiple circular solar energy panels held in a holding cavity and sequentially nested on the outer side of a hydraulic air cylinder; the circular solar energy panels stretch out along with the rising of the hydraulic air cylinder and are distributed step by step; an outer clamping ring or at least two clamping blocks arranged at an interval are arranged on the lower end of an outer circumference of the circular solar energy panel on the inner side, a corresponding inner clamping ring or at least two clamping blocks arranged at an interval are arranged on the upper end of an inner circumference of the adjacent circular solar panel on the outer side, so that the circular solar energy panels are not separated when stretching out; the power system comprise a power supply tank and an energy storage battery connected electrically. According to the circular lifting type solar energy charging pile provided by the invention, the circular solar energy panels canbe automatically stretched, and all direct or indirect sunlight in an ambient environment is fully utilized, so that the circular lifting type solar energy charging pile is higher in efficiency, energy saving, environmentally friendly, and safe and stable during a charging process.

The invention discloses auxiliary equipment of a new-energy vehicle. A moving groove is arranged in a pile body. The left side on the moving groove and the outer end of the pile body communicate with a pin groove. A vertical groove communicating with the pin groove is arranged in the pile body on the left side of the pin groove. An electrification groove opposite to the vertical groove is arranged in the pile body on the right side of the pin groove. An electrification contact sheet connected with the municipal electricity is arranged on the groove bottom of the electrification groove. The upper part of the vertical groove communicates with a transformation groove which stretching out towards the right side. A moving block capable of up-down moving is arranged in the moving groove. An electrification hole which is in matched connection with a plug of the new-energy vehicle is arranged in the left end face of the moving block. According to the invention, the auxiliary equipment is simple in structure, safe, reliable and high in power supply stability; occurrence of electric shock accidents is greatly reduced; safety of people is effectively ensured; and the whole equipment is simple to operate and suitable for promotion and use.

The invention discloses an improved advertisement display screen device, which comprises a base which is defined by a push part and an electric connecting part and a display screen which is matched with and connected to the base, wherein a first transmission cavity is formed in the bottom of the lower right end of the push part; a first spiral rod is arranged in the first transmission cavity; the right side end of the first spiral rod is in transmitting connection to a first motor; a sliding locking part, which is in matched connection to the first spiral rod by virtue of a screw thread; a second transmission cavity is kept in the sliding locking part; a second spiral rod is arranged in the second transmission cavity; the right side end of the second spiral rod is in transmitting connection to a second motor; an arranging groove is formed in the bottom of the second transmission cavity; a cavity is kept in the sliding locking part at the left side of the arranging groove; a push block is arranged in the cavity; the upper side of the push block is inserted into the second transmission cavity and is matched with the second spiral rod by virtue of a screw thread; a placing groove is formed in the sliding locking part at the right side of the arranging groove; a clamping groove is formed in the lower end of the placing groove; and a guide groove is kept between the clamping groove and the arranging groove.

The invention discloses a charging device for a solar energy automobile. The charging device for the solar energy automobile comprises a body fixed on the top of a protection base, and a rain-proof shed arranged above the body. A receiving cavity is arranged in the body, a first cavity and a second cavity are arranged in the body, above the receiving cavity, a sliding groove is arranged in the inner top wall of the first cavity, an operating groove is arranged in the outer wall of the body, on the right side of the receiving cavity, a through hole and a clamping groove are arranged between the operating groove and the receiving cavity, a rotating shaft which extends up and down is arranged in the receiving cavity, the extending section at the top of the rotating shaft penetrates the inner wall of the body and extends into the first cavity, the tail end of the rotating shaft in the first cavity is fixedly provided with a first gear, a receiving tray is fixedly arranged in the receiving cavity, on the circumference of the rotating shaft, a charging wire is coiled in the receiving tray, a sliding block is arranged in the sliding groove, the bottom of the sliding block extends into the first cavity, and a first motor is arranged in the end face of the bottom of the sliding block. The charging device for the solar energy automobile has the advantages of simple structure, convenience in operation, capability of automatically performing winding-up and high security.

The present invention provides an electric connecting method for plugs, sockets, mobile sockets, cable couplers, appliance couplers and the like of indoor and outdoor and the device thereof. The electric connecting device comprises a rotary rebound wedge type connecting head of a metal contact A with a guide positioning concave groove and a wedge face C and a rotary rebound wedge type connecting base of a metal contact B with a guide positioning convex platform and a wedge face D, and completes the electric connecting through the mutual wedge of the wedge face C of the metal contact A and the wedge face D of the metal contact B. The present invention has wide application range, guaranteed safety and can prevent accident electric shock (the conductor can not contact the conductive elements even if putting into the hole with opened hole. The connector has no exposure of electrical objects after connecting or during connecting, thereby effectively improving safety coefficient and preventing occurrence of accident electric shock.), thereby greatly reducing arc rising and preventing explosion transmission. The present invention has the advantages of easy acquisition of material, simple art, large amount of copper saving, low cost, standardization, reasonable structure, simple operation and reliable connection performance. The connecting device has self locking function in connection with the power source in particular and can not loosen off due to shock, attack and external force (at the time the connecting device are wedged with each other so as to form a clipping state with good performance of conduction, anti-shock, anti-attack and anti-falling and can be pulled out only through correct operation by hand) and has good electric connection effect.

The invention discloses a letter box device with an illuminating function. The letter box device comprises a mounting shell fixedly mounted in the top of a letter box body and an illuminating lamp, wherein a boss is arranged at the top of the mounting shell, a first sliding chute expanding left and right is formed in the mounting shell, a tooth window is arranged at the left end of the first sliding chute in the mounting shell, a turbine groove upward expanding into the boss is also arranged in the mounting shell, a perforation which runs through left and right and is communicated with the turbine groove is formed in the boss, and a plate body which can translate left and right is arranged in the perforation. The letter box device disclosed by the invention is simple in overall structure, an electric shock accident caused during mounting or dismounting of the illuminating lamp is effectively reduced, energy conservation and environmental friendliness are realized, and the letter box device disclosed by the invention is applicable to popularization and application.

A loudspeaker device convenient to maintain, disclosed by the present invention, comprises a top seat composed of a fixing part and a locking part and an insertion part equipped with a loudspeaker at the bottom, the top end face of the fixing part is equipped with a fixing plate, and the fixing plate extends towards the left and right ends of the fixing part. Fixing holes are respectively arranged in the extended segments at the two ends of the fixing plate, bolts are arranged inside the fixing holes, and an insertion cavity extending downwards is arranged in the middle part of the fixing part. The bottom of the insertion cavity penetrates the locking part, the top wall of the insertion cavity is equipped with a spacer block, and the fixing parts at the left and right sides of the spacer block are both equipped with the first sliding cavities. The bottoms of the first sliding cavities are equipped with the cavities, the second sliding cavities are arranged in the locking part at the bottoms of the cavities, and the first sliding blocks are arranged inside the first sliding cavities. The plug pin holes are arranged at the inner sides of the bottoms of the first sliding blocks, the bottoms of the first sliding blocks at the outer sides of the plug pin holes are equipped with the first toothed chain parts, and the gear wheels in toe joint with the bottoms of the first toothed chain parts are arranged inside the cavities. The second sliding blocks are arranged inside the second sliding cavities, the locking rods which penetrate the locking part and are in slip cooperative connection are arranged at the outer sides of the second sliding blocks, and the sides of the second sliding blocks far away from the locking rods are equipped with the beveled end parts.

The invention provides a crawling ladder capable of preventing mistakenly climbing. The crawling ladder comprises a pair of vertical rods which are arranged in parallel, an upper fixed cross rod and a lower fixed cross rod, wherein the upper fixed cross rod is fixedly arranged between the upper parts of the pair of vertical rods; the lower fixed cross rod is fixedly arranged between the lower parts of the pair of vertical rods; a plurality of groups of footrest cross rod mounting racks are symmetrically arranged at the inner sides of the pair of vertical rods; each footrest cross rod mounting rack comprises a pair of pieces of L-shaped angle iron arranged on the vertical rods; each pair of pieces of L-shaped angle iron are fixed on the vertical rods up and down; a mounting groove is formed between each pair of pieces of L-shaped angle iron; and a footrest cross rod is arranged in the mounting groove. The crawling ladder has the advantages of being scientific in design, simple in structure, convenient to install and good in effect of preventing mistakenly climbing.