1511results about How to "Improve the anti-theft effect" patented technology

The invention discloses an electrical locomotive auto-passing neutral section control system. In the control system, a signal generator used for transmitting passing neutral section anticipating signal is arranged on a vehicle mainframe of an electrical locomotive, wherein the vehicle mainframe comprises a signal receiver used for receiving the passing neutral section anticipating signal, a memory unit used for storing the required time of locomotive neutral section operation, a clock, a speed sensor used for providing the current speed of the electrical locomotive for a controller, the controller used for outputting passing neutral section control signal and restoring the control signal and a contact network connection controller used for controlling a contact network electrical connection device. The timing that the invention executes the auto-passing neutral section operation is accurate and the reliability of the auto-passing neutral section control is high.

The invention relates to a full-automatic intermittent multi-specification carton boxing machine which comprises a machine frame, a carton opening system, a carton conveying system, a material conveying system, a material pushing device, a semi-finished carton cabin, a carton sealing device and a transmitting mechanism. The material conveying system the carton box conveying system synchronous drive and are partially overlapped, the carton opening device is distributed at the beginning end of a carton conveying chain, the carton conveying system and the carton opening device are arranged in a carton conveying cabin, the material pushing device is distributed above the overlapped portion between the material conveying system and the carton conveying system and is perpendicular to the carton conveying system, the semi-finished carton cabin is arranged on the carton conveying cabin and distributed above the carton opening system, and the carton sealing device is arranged on the carton conveying system. The full-automatic intermittent multi-specification carton boxing machine is simple in structure, low in manufacturing cost and good in generality and can meet the carton opening requirements of various-specification cartons by adjusting the carton opening device, the semi-finished carton cabin and the carton conveying system according to the sizes of different products.

Theft resistant upstanding mounts adjustably support at temporary, often unattended outdoor locations, such costly devices as compact, wireless electronic devices that control such excavation machinery as bulldozers and road graders. Each mount is connectable to or includes a massive base structure, and includes an upstanding, telescopically extensible mast. Lockable connections are provided between many components of the mount. A lockable, swivel connection provided between the mast and a costly device supported atop the mast permits leveling of the costly device for proper operation even if a longitudinal axis of the upstanding mast deviates significantly from true vertical. A protective cover locked to the mast assembly denies access to a control knob that might otherwise be used to detach the costly device from the mast.

The invention relates to a vehicle-bone 3G remote monitoring system and a monitoring method, which uses a 3G communication module as a camera terminal, and a 3G mobile phone as a monitoring terminal. The system comprises an automobile, the 3G communication module, a 3G communication channel and the 3G mobile phone. The camera terminal consists of the 3G communication module and a vehicle-bone power supply and is positioned in an automobile; the output end of the vehicle-bone power supply is connected with the power supply input end of the 3G communication module through a power supply convertor; the work triggering end of the 3G communication module is controlled by a signal output by a sensor or an instruction sent by the 3G mobile phone; video signals and audio signals taken by the 3G communication module automatically put through the 3G mobile phone by the triggering of the sensor signal; one path of the video signals and audio signals are transmitted to the 3G mobile phone of the monitoring terminal through the 3G communication channel, and the other path is transmitted to a vehicle-bone hard disk or a memorizer, or receives the instruction of the 3G mobile phone to automatically start work; and the video signals and audio signals taken by a camera are transmitted to the 3G mobile phone of the monitoring terminal or the vehicle-bone hard disk or the memorizer through the 3G communication channel.

The invention discloses an electromechanical side-locking interlocking anti-theft alarm lock. A rear key cylinder and a connecting body are completely disconnected from a front key cylinder; the connecting body is hidden in an invisible hole; a lock angle and a lock column of a rotation block lock the front key cylinder; a lock head locks the rear key cylinder; the front key cylinder and the rear key cylinder perform asynchronous rotation alarm; an electronic remote control device is installed in a power supply circuit of an electromagnet; mechanical and electrical invisible interlocking, mechanical interlocking, invisible connection and asynchronous alarm of the front and rear key cylinders are integrated into a whole, so that thieves cannot open the interlock device and rotate the rear key cylinder, and even the thieves use brutal means to damage the side-locking device and the connection lock, only the front key cylinder can rotate, and the rear key cylinder cannot rotate. Even the thieves use an electric hand drill to remove the front key cylinder and the rear key cylinder, and use clamps to rotate a connection tongue, rotating contacts cannot in contact with fixed contacts, so that the power supply circuit of the electromagnet cannot be connected; and the electronic remote control device interrupts the power supply circuit of the electromagnet, so that a safety lock can be opened.

The invention provides an anti-theft municipal well cover detachment structure, and belongs to the field of equipment of municipal engineering, which solves the problem of poor anti-theft property of the existing well cover. The anti-theft municipal well cover detachment structure comprises a well base, a cover body, a detachment ring, a plurality of detachment rods, a hinge base and a steel plate, wherein the top part of the inner wall of the well base is provided with an annular groove; the cover body is covered on the annular groove; detachment holes are formed in the cover body; a connecting base is fixedly arranged at the inner edge of the detachment ring, penetrating holes are formed in the connecting base, and the detachment rods are penetrated into the penetrating holes in the connecting base; the hinge base is fixedly arranged on the bottom surface of the cover body; the steel plate is movably connected with a pin shaft; the pin shaft is movably connected with the hinge base; the inner wall of the well base is provided with a clamp groove; the outer end of the steel plate is positioned on the clamp groove; a tension spring is connected between the top surface of the inner end of the steel plate and the bottom surface of the cover body; each detachment hole is projected onto the top surface of the inner end of the steel plate. The anti-theft municipal well cover detachment structure has the advantage that the anti-theft property is good.

The invention discloses an anti-theft lock integrating the functions of asynchronous interlocking, electromechanical interlocking, warning and invisibility. An asynchronous lock spring is arranged in an asynchronous bearing hole and abuts against an asynchronous lock head in an asynchronous lock hole, and a push rod is arranged behind the asynchronous lock head; an invisible key or an invisible connection is hidden in an invisible hole, a fixed contact is arranged on a lock body, a rotating contact is arranged on a rotary surface of a rear lock cylinder or arranged behind the rear lock cylinder, a main contact is arranged at the front end of the rear lock cylinder, and an auxiliary contact is arranged at the rear end of a front lock cylinder; the front lock cylinder is completely disconnected from the rear lock cylinder, the rear lock cylinder is locked through the asynchronous lock head, a power supply contact and the rotating contact are connected into a power supply circuit of an electromagnet, an electronic remote control device interrupts the power supply circuit of the electromagnet, and the main contact and the auxiliary contact are connected into a power supply circuit of an asynchronous warning system. The rear lock cylinder and a connection tongue cannot be rotated if a specifically-matched key is not used for unlocking. The anti-theft lock integrates the functions of asynchronous interlocking, electromechanical interlocking, invisibility, self locking and asynchronous warning and is high in safety index.

The invention discloses a cloud control navigator system for reporting road conditions in real time. The system comprises a navigator which carries a positioning module, positions position information of a current vehicle through satellite navigation and transmits the position information to a base station; and the base station which is provided with a cloud road condition service system for receiving the real-time position information of the current vehicle, carrying out big data statistical analysis and transmitting road congestion conditions to the navigator. The navigator combines the received real-time road congestion conditions with an electronic map to form a real-time road condition map, gives a prompt to a car owner, and at the same time, analyzes a current vehicle speed and congestion conditions of a destination route set by the car owner and carries out route planning according to instruction conditions. The navigator is also provided with a query module, a speed measurement module, a sensing module, a prompt module and a communication module, and at the same time, also carries a voice operation system and a traditional button operation system, and a monitoring pick-up head capable of 360-degree rotation is also arranged in the vehicle. An automobile safety protection system can be improved.

The invention discloses an interlocking asynchronous alarming key-hidden anti-theft lock. An asynchronous lock head locks a rear lock cylinder, a front lock cylinder and the rear lock cylinder are completely disconnected, a hidden key shields part of a locking-holding hole, a thief can not open an interlocking device or rotate the rear lock cylinder, can not open a projectile partially shielded by the hidden key inside a hidden hole through an unlocking tool, and can not rotate the front lock cylinder and the rear lock cylinder. Even though the thief damages an ejection cylinder brutally through a flat tool and forcedly rotates the front lock cylinder, the rear lock cylinder is not connected with the front lock cylinder due to the locked and hidden asynchronous lock head and does not rotate along the front lock cylinder, only the front lock cylinder can be rotated, the hidden rear lock cylinder can not rotated, and an alarm is given due to the asynchronous rotation of the front lock cylinder and the rear lock cylinder. The interlocking asynchronous alarming key-hidden anti-theft lock integrates the functions of being anti-theft, being hidden, achieving asynchronous interlocking and giving an alarm.

A hidden electronic lock, comprising a lock body assembly, an identity authentication reading device, and a controller that operates the lock body assembly to open and close according to the identity authentication reading device, is characterized in that: the hidden electronic lock has at least one locking point, each There is a set of lock body components on each lock point, and the lock body components are arranged on the inner side of the door body; the lock body components are composed of electromagnets, shelves, dead bolts, springs, lock hooks and elastic elements; when energized and locked, the electromagnetic The electromagnetic force of the iron acts on the lock tongue downwards, the elastic force of the spring acts on the lock tongue upwards, and the friction force on the friction surface acts on the lock tongue downwards. When unlocking, the power off cancels the electromagnetic force, and the Press the door body in the direction of the lock tongue so that the head of the lock tongue is separated from the side wall of the blind hole, the friction force disappears, and the elastic force of the spring forces the lock tongue completely away from the blind hole of the lock hook to unlock the lock body assembly . The concealed electronic lock of the present invention does not have any pickable point for forced opening, and has better anti-theft performance.

The invention provides an electricity-larceny-preventing electricity meter box which comprises an electricity meter box body and an electromagnetic lock. A separating partition separating the electricity meter box into an electricity meter chamber and a meter checking chamber is vertically arranged in the electricity meter box body, a meter reading window is formed in the separating partition, two sides of the separating partition are slidably arranged on the inner side of the electricity meter box body, the electromagnetic lock is fixed on the inner side of the electricity meter box body, locks the separating partition and is connected with an electromagnetic lock unlocking controller. The electricity-larceny-preventing electricity meter box has the advantages of scientific design, reasonable structure, high practicability and good electricity-larceny-preventing effect.

The invention discloses an asynchronous alarming and invisible interlocking safety anti-theft lock. In the asynchronous alarming and invisible interlocking safety anti-theft lock, an asynchronous lock hole penetrates through the front and rear end surface of a back lock core in a position close to the outer edge part of the back lock core; the interior of an asynchronous lock hole is provided with an asynchronous lock head; an asynchronous lock spring is positioned behind the asynchronous lock head; a push rod is arranged in front of the asynchronous lock head; the asynchronous lock head firmly locks the back lock core; a front lock core is completely disconnected from the back lock core; invisible connection is hidden inside an invisible hole; an electronic remote control device is invisibly mounted inside the circuit of an electromagnet and breaks the circuit, so that a thief is unable to open the interlocking, rotate the back lock core and connect power supply circuit of the electromagnet; even if the thief adopts an unlocking tool and rotates the front lock core, due to the locking and invisibility of the asynchronous lock head, the back lock core is not connected with the front lock core and does not rotate with the front lock core; since only the front lock core can be rotated and the invisible back lock core cannot be rotated, the asynchronous rotation of the front lock core and the back lock core gives out an alarm; moreover, the invisible installation of the electronic remote control device enables the functions of theft prevention, invisibility, asynchronous interlocking and alarming to be integrated.

The invention discloses an electric meter box device with the functions of preventing electricity stealing and carrying out monitoring. The electric meter box device comprises a reed tube, a power source, an alarm, a release switch and a time-delay relay. The power source, the alarm and the reed tube form a magnetic field alarm circuit. The time-delay relay, the release switch and the power source form a trigger alarm circuit. A mobile phone with the one-key get-through function is arranged below the time-delay relay. A camera module is arranged in a box body and used for collecting audio-video data and sending the audio-video data to an audio-video decoder, then compressed encoding processing is conducted on the audio-video data, and the audio-video data after the compressed encoding processing is conducted are sent to an M2M module and then are uploaded to a management platform through the M2M module. After the electric meter box device is used, not only is the good effect of preventing electricity stealing achieved, but also criminal offenders are arrested lawfully and unwittingly, arrogance of the criminal offenders is greatly struck, and behaviors of stealing electricity and damaging an electric meter box are eliminated.

An induction-type lock for the power switch of motorcycle is composed of a turning part, a drive rod driven by said turning part for locking the handle-bar of motorcycle, a lock bolt driven by said drive rod, a confirming part for confirming the locking state to make the drive rod be separated from turning part, an electromagnetic valve, and a guide pin controlled by said electromagnetic valve for limiting the position of confirming part and unlocking the handle-bar.

An electric energy meter single enclosure structure designed according to the invention solves the technical problems of complex operation and low efficiency in the current electric energy meter enclosure. The structure comprises an electric energy meter shell and a flip cover, wherein the flip cover is engaged with the upper part of the shell in a covering manner and is provided with a through hole thereon, a metal piece with a slot is embedded on a surface where the shell is corresponding to the through hole, the upper part of the slot is a reverse step structure with narrow outside and wide inside, a bolt with a buckle on the tail thereof penetrates through the through hole to be in clamping connection with the metal piece, and the buckle is buckled on the step surface of the slot, and the head of the bolt adopts a step-shaped structure and the step surface thereof abuts against a working surface of the flip cover. The electric energy meter single enclosure structure can prevent the electric energy meter from being modified viciously during the use of the electric energy meter, and the bolt clamping connection structure is not exposed so as not to be restored after being destroyed, the sign representing that the electric energy meter is destroyed can be easily found, the destroyed electric energy meter can be replaced in time, and the anti-electricity theft effect is excellent.

The invention provides an infrared correlation technology based intrusion detection device. The infrared correlation technology based intrusion detection device comprises an infrared transmitter and an infrared receiver. The infrared correlation technology based intrusion detection device is characterized by also comprising an LED (Light Emitting Diode) lighting device and a camera device which are connected with the infrared receiver; the LED lighting device comprises an LED lamp control circuit, an LED driving circuit and an LED lamp which is connected with the LED driving circuit; the LED lamp control circuit is trigged by an alarm signal and the LED driving circuit is driven to start the LED lamp; the camera device comprises a camera host and a camera; the camera device is triggered by the alarm signal to perform shooting and enters into the standby state after the alarm trigger signal is interrupted. According to the infrared correlation technology based intrusion detection device, a multiple function integrated security product is provided for a user, intruders can be deterred by multiple warning methods indeed, and accordingly crimes can be reduced.

The invention discloses a safe box with a black box. The safe box comprises a box body, a safe box liner, an opening and closing door, a partition plate, a camera, a controller and a locking component, wherein the safe box liner is placed in the box body, the opening and closing door is rotatably connected to the safe box liner, the partition plate is rotatably fixed into the safe box liner, the camera is placed on the opening and closing door, the controller is placed in the opening and closing door, processes information transmitted by the camera and accordingly controls locking of the opening and closing door, the locking component is connected to the controller and clamped to the safe box liner, and the safe box liner is divided by the partition plate into the black box for placing valuables and a vacant box close to the opening and closing door. Even if a burglar opens the opening and closing door, the burglar thinks that the safe box is empty and gives up, safety is enhanced, the burglar can hardly open the opening and closing door by special design of the safety door, and antitheft effect is fine.

The invention relates to anti-theft doors and discloses an intelligent anti-theft door and a control method thereof. The intelligent anti-theft door comprises a door frame and a door body hinged to the door frame and further comprises a door handle lock and a reinforcing lock, wherein the door handle lock and the reinforcing lock are used for locking the door body and the door frame. An infrared microwave sensor and an infrared thermal inductor are arranged on the door frame. The infrared microwave sensor is used for sensing whether an objected is inserted into the door handle lock or not. The infrared thermal inductor is used for sensing the heat of a human body. A controller is further arranged on the door frame. The infrared thermal inductor is used for transmitting a detected heat signal to the controller. The controller transmits a command to start the infrared microwave sensor. The infrared microwave sensor is used for feeding the detected signal back to the controller. The controller is connected with the reinforcing lock and used for controlling the reinforcing lock to be started. As for the controller, whether a door opener is a house owner or a thief can be judged through the infrared microwave sensor according to the door unlocking duration, when the door unlocking duration is longer than the time set by the controller, the door body is locked by the reinforcing block on the door frame, and thus the anti-theft effect of the anti-theft door is better.

The invention relates to the field of public facilities, in particular to an improvement on a street lamp with an umbrella, and provides a street lamp with an automatic umbrella, which is ingenious in structure, high in stability and high in safety, is not required to be controlled manually during use, and can open and close the umbrella automatically. A triggering assembly is arranged above the umbrella, is accommodated in a lamp post and comprises a fixed seat, a spring, a triggering ball head, a balance weight block and sponge; the fixed seat is fixedly connected with the interior of the lamp post and is positioned below a plurality of through holes; the balance weight block is in sliding connection with the interior of the lamp post and is positioned above the fixed seat; the triggering ball head is movably connected to the inner wall of the lamp post and is positioned between the fixed seat and the balance weight block; the sponge is supported on the top surface of the balance weight block, and an electrothermal wire fixedly connected to the balance weight block is further arranged between the balance weight block and the sponge. No manual operation is needed; the street lamp with the automatic umbrella has the characteristics of high automation degree, high response rate and high safety.

The invention discloses an electric alternative type interlocking anti-theft lock. A fixed contact is fixed on a lock body or a fixed casing of the anti-theft lock; a lock cylinder and interlocking holes are formed in the lock body; locking holes and locking stopping holes are formed in the lock body and the lock cylinder; ejecting pin holes are formed in lock barrels; interlocking springs, ejecting pins, locking pins and propping pins are arranged in the interlocking holes and the ejecting pin holes; headpins and interlocking tops in the locking stopping holes are contacted and matched with the propping pins; a rotating connector is located at the rear end part of the lock cylinder, and a rotating contact is fixed on the rotating connector; and the rotating contact and the fixed contact are connected to a power supply circuit of an electromagnet which is connected with a horizontal lock piece. According to the scheme, the structure is reasonable, manufacturing and use are convenient, the ejecting pins and the locking pins can lock the lock barrels transversely, so that the lock cylinder and the rotating connector are completely disconnected, a thief or an unlocking specialist cannot open the interlocking device and cannot rotate the rotating connector, the circuit of the electromagnet cannot be connected, and accordingly, anti-theft interlocking and anti-theft invisibility of the anti-theft lock are realized.

The invention relates to an active type safety evacuation system provided with a sound-light alarming function and capable of being connected to the Internet. The system comprises a frame, wherein an escape door is arranged on the frame, one side edge of the escape door is hinged to the frame, the other side edge of the escape door is provided with a set of stop pin and electromagnetic switch, the stop pin is linked with a stop pin release pull rod driven by a motor, an inflation bag connected with a high-pressure air source through a switching valve is arranged at the bottom of the frame, and the motor is linked with the switching valve through a linkage mechanism. When the system is in a defense state, the stop pin release pull rod is located at a stop pin closing position, an electromagnetic switch is in an attraction state, and the inflation bag is a rolling state without being inflated while the switching valve is closed; when the system is in an alarming state, the stop pin release pull rod is located at a stop pin opening position, the electromagnetic switch is in a release state, the inflation bag is inflated and unfolded to be in a sliding board or sliding pipe state after the switching valve is opened. One or a set of systems can be installed to form an escape way, relevant data are exchanged with a factory database regularly, and a certain anti-theft effect is achieved.

The invention discloses a coin-operated commercial clothes washing / drying machine and relates to the technical field of clothes washing and drying equipment. The coin-operated commercial clothes washing / drying machine comprises a box body and a coin box assembly arranged in the box body, wherein a supporting structure is fixedly arranged in the box body; at least the bottom surface of the coin box assembly is fixedly connected with the supporting structure through fasteners; the fasteners penetrate through the inside of the coin box assembly and are fixedly connected with the supporting structure. According to the coin-operated commercial clothes washing / drying machine, the supporting structure is arranged in the box body, the bottom surface of the coin box assembly is fixedly connected with the supporting structure, the fasteners such as screws and the like cannot be seen from the appearance of the whole machine, a thief cannot start stealing, the stealing intention of the thief is dispelled, or the thief gives up stealing; besides, the coin box assembly is fixed to the supporting structure through the bottom surface, the fixing structure is hidden on the bottom surface of the coin box assembly, thus, even if the thief can open a casing of the whole machine, the thief cannot or can hardly disassemble the coin box assembly, and the good anti-theft effect is realized.

The invention provides an anti-theft automatic lock, and belongs to the technical field of hardware door lock accessories. The problems that an existing anti-theft door cannot be locked automatically when the door is closed, and the anti-theft performance is poor are solved. The anti-theft automatic lock comprises a panel, a latch bolt, a lock body, a main lock tongue, a lock tongue plate, a lock tongue plate locking reset mechanism, a latch bolt lever and a lock tongue plate unlocking driving mechanism, the lock tongue plate unlocking driving mechanism comprises a thumb wheel, a toggle assembly and a handle shift fork, the toggle assembly is meshed with the thumb wheel and the handle shift fork simultaneously, a fixed block is fixedly arranged on the lock tongue plate, a guide mechanism is arranged between the lock tongue plate and the lock body, a limiting link piece is arranged on the lock body, an unlocking reset mechanism which drives the limiting link piece to switch from an insurance locking position to an unlocking position is arranged between the limiting link piece and the lock body, a locking mechanism which drives the limiting link piece to switch from the unlocking position to the insurance locking position is arranged between the limiting link piece and the lock tongue plate, and a touch unlocking mechanism is arranged between the latch bolt plate and the limiting link piece. The anti-theft automatic lock has multiple insurance functions, the anti-theft effect is good, and automatic locking can be achieved.

The invention discloses an electric anti-theft directional lock. The electric anti-theft directional lock comprises a shell 1, a lock cylinder 2 and a lock tongue 3. The shell 1 comprises a first through hole 11 and a second through hole 12. The lock cylinder 2 can be rotably arranged in the first through hole 11. The lock tongue 3 can be movably arranged in the second through hole 12. When the lock cylinder 2 rotates, the lock tongue 3 is driven by the lock cylinder 2 to move outwards or move inwards in the length direction of the second through hole 12. The electric anti-theft directional lock further comprises a limiting piece 5, a drive mechanism 6 driving the drive limiting piece 5 to retract, a control unit 7 connected with the drive mechanism and a remote control 8 which sends a control signal to the control unit 7 and ensures that the drive mechanism is driven by the control unit to move. A first elastic piece 61 is arranged between the limiting piece 5 and the drive mechanism 6. The limiting piece 5 stretches outwards under the action of the elasticity of the first elastic piece 61 and limits the lock tongue 3, and after the remote control 8 sends the control signal, the limiting piece 5 is driven by the drive mechanism 6 to retract, and limiting of the lock tongue 3 is relieved. The electric anti-theft directional lock has the advantages of being good in anti-theft effect.

The invention discloses a burglary-resisting electric transformer room, which contains wall, floor, door and warning device. An auxiliary cement layer is set on the floor. The door is composed of a protect door and a burglary-resisting door inside the protect door. The burglary-resisting door has a triple-link lockset and several supporting bars between outer shell and inner shell which form a cavity filled with concrete packing to reinforce it. The triple-link lockset links mechanical lock, coded lock and control lock mutually, which improves the assurance coefficient and burglary-resisting effect. The warning device can send alerting signal to the reserved telephone number to realize allochthonous remote warning, spot horn warning and allochthonous operation and location, which has more perfect function and more convenient operation and improves the burglary-resisting ability.

The invention discloses a method for preventing a fastening nut from being stolen, an anti-theft nut and a special sleeve tool. A nut with internal threads is made into a cylindrical nut; when the cylindrical nut and a bolt are connected and fastened together, a washer sleeve with a cover sleeve is arranged on the bolt, and the cylindrical nut is connected to the bolt through the threads and is screwed on the bolt through the special sleeve tool with a one-way needle bearing, so that the cylindrical nut tightly presses the washer sleeve and is covered by the cover sleeve on the washer sleeve; and when the nut is needed to be loosened, another special sleeve tool with the one-way needle bearing in a different rotating direction stretches into an inner hole of the cover sleeve on the washer sleeve and is sleeved on the nut to loosen the nut. The invention has the advantages that: the anti-theft nut is difficult to steal, has a good anti-theft effect and reliable performance, and is convenient to install, maintain and disassemble.

The invention relates to the technical field of construction engineering pipelines. A manhole cover is composed of a manhole cover body, a base, pawls, cover opening ejector rods, elliptical reverse thread locking heads, unlocking opening reverse thread rods and the like. A trapezoid stopping ring on the bottom surface of the manhole cover body is sleeved with a pressure-proof rubber ring for preventing noise. When the manhole cover body is installed and placed on the base, the pawls are pressed down by the trapezoid stopping ring, and elastic force of ejector rod springs is transmitted to the pawls through levers and pawl connection rods to abut against and lock the trapezoid stopping ring so that an antitheft effect can be achieved. When the manhole cover body is opened, reverse thread pressure proof rubber plugs, gib headed keys and the elliptical reverse thread locking heads are taken out, the unlocking opening reverse thread rods are screwed into elliptical reverse thread locking holes, conical funnels and conical ejector rods are sleeved and connected, the levers are pushed, and the pawls are receded and unlocked through the pawl connection rods; and at the moment, the levers are just jacked to the upper ends of long-strip-shaped opening unlocking holes, and the manhole cover body is opened in a hidden mode by the pushing force of the unlocking opening reverse thread rods through the levers and the cover opening ejector rods. The contact surface between the manhole cover and a road is increased in a multilayer mode through a pawl mechanism box, a pressure-proof rubber ring flange face and a pavement flange face so that sedimentation can be prevented.

The present invention discloses a lock head of cylinder lock and its key. It is mainly characterized by that in the interior of lock shell a medium lock core is set, and in the interior of the medium lock core an intenal lock core is set, on two lock cores the ball holes are respectively set, the ball is mounted in the ball hole, and the central position of the described internal lock core is equipped with lock hole, on the edge of said lock hole a slot is cut, and is communicated with the lock hole, and the lock hole face of the described internal lock core is perpendicular to the ball hole on the intenal lock core, and the described slot is matched with ball on the medium lock core, the described lock shell and ball holes on the medium lock core and internal lock core can be mutually communicated when said lock is unlocked, and the front and side track of the key plate can be matched with balls on the internal lock core and medium lock core respectively.