31 results about "Electric bell" patented technology

The utility model discloses an electrical equipment temperature measurement alarm device, which comprises a display screen and a sensor, the bottom of the display screen is provided with a connecting assembly, the connecting assembly comprises a support rod and a rotating rod, the support rod is provided with a fixing assembly, the fixing assembly comprises a support plate and a sealing sleeve, the support rod is provided with a temperature control assembly, and the temperature control assembly is provided with a temperature sensor. The temperature control assembly comprises a clamping sleeve and a sleeve, the inner side of the sleeve is provided with a movable assembly, the movable assembly comprises a piston and a button, the electrical equipment temperature measurement alarm device can turn on the electric bell through the sensor and the button at the same time to carry out alarm work, even if a certain alarm mechanism breaks down, the alarm work can be carried out smoothly, and the alarm efficiency is improved. The display screen is fixed by rotating the display screen on the supporting rod through the rotating rod and loosening the bayonet lock, so that the display screen is convenient for personnel to check and work, and the display screen can be conveniently mounted at different positions of the electrical equipment and is suitable for temperature measurement and alarm of the electrical equipment.

The pressure relief device of the liquid carbon dioxide storage tank comprises a storage tank, the upper surface of the storage tank is fixedly connected with a valve body, the bottom of the inner side face of the valve body is connected with a valve element in a sliding mode, and the upper surface of the valve element is fixedly connected with a spring. According to the pressure relief device of the liquid carbon dioxide storage tank, three groups of pressure relief pipes, a connecting rod, a supporting arm, an induction button and an electric bell are arranged, so that the pressure relief speed of the device is increased, the device can realize graded pressure relief, and the safety of the device can be improved; when the storage tank is decompressed, the other end of the supporting arm presses the sensing buttons, so that the electric bell gives out warning sound to remind a worker that the storage tank is decompressed and is careful, the electric bell can be provided with three warning sounds corresponding to the three sets of sensing buttons, the device can give out different warning sounds according to different levels of pressure relief speeds, the effect is better, and use is convenient.

The utility model relates to a kind of coal gas blower speed measurement early warning device in the technical field of equipment monitoring, to solve the problem that speed measurement early warning device is poor in anti-interference, leading to inaccurate measurement, and there is no early warning and the measures of the stop of coal gas blower.The device converts the speed of gear into electrical signal by three speed probes, reduces the signal interference of environment using shielding layer and protection device box, improves the anti-interference of detection equipment, shielding layer is connected with transmitter and safety barrier in protection device through cable, multiple safety barriers are connected with PLC controller, flash alarm and bell, when detecting abnormal speed, flash alarm will emit light and bell will alarm, when PLC controller receives at least two probe over-limit signals and lasts 1-3 seconds, PLC controller will send interlock parking signal, control coal gas blower to stop running, meet the demand of safe and accurate monitoring, reduce economic loss.

The application relates to the technical field of intelligent compact shelves, and discloses an intelligent compact shelf with initiative safety protection, which comprises a compact shelf body, a control module, a display screen, a pulley, a guide rail and a floor. The control module is fixedly installed at the top of the compact shelf body, the display screen is arranged on the front of the compact shelf body, the pulley is movably installed at the bottom of the compact shelf body, the inside of the guide rail is slidably connected with the bottom of the pulley, and the top of the floor is inlaidly installed with the guide rail. Through the arrangement of the horizontal detection assembly, when the compact shelf body slightly inclines during the operation of the pulley on the guide rail, the balance cylinder at the bottom of the receiving frame will be inclined, the inclination of the balance cylinder will pull the lead, and the electric bell will ring to warn that the compact shelf has the risk of falling, so that the compact shelf can be detected at any time, the effect of immediate early warning is achieved, and the staff is reminded to timely eliminate the risk and prevent the risk from occurring.

The utility model discloses a remote control system for quantitative coke loading, which comprises a coke storage bin, a dust hood, a camera, a radar level gage, a DCS (distributed control system), a display and an electric bell, the dust hood is fixedly arranged on the outer side of a discharge pipe of the coke storage bin, and a gate valve, a lifting mechanism and a lifting chute are arranged in the dust hood. The gate valve is arranged on a discharging pipe of the coke storage bin, the fixed end of the lifting mechanism is fixed to the inner top of the dust hood, the movable end of the lifting mechanism is fixed to the fixed end of the lifting chute, and the lifting chute is arranged below the discharging pipe of the coke storage bin. A camera and a radar level gage are further fixed in the dust removal cover, the camera is in signal connection with a displayer, the signal output end of the radar level gage is connected with the signal input end of a DCS control system, and the DCS control system is electrically connected with the electric bell, the gate valve, the lifting mechanism and the driving end of the lifting chute. According to the utility model, the in-place of the truck is remotely monitored, the charge level indicator senses the charging amount, the coke loading is remotely and accurately quantified, a single person can simultaneously control a plurality of trucks to load, the automation degree is higher, and the operation is quick and convenient.

The utility model discloses an electronic component detection tool, which comprises a base and a support plate, a clamping assembly is arranged on the base, the clamping assembly comprises a first clamping plate and a second clamping plate, a pushing assembly is arranged on the support plate, the pushing assembly comprises a motor and a screw rod, a movable assembly is arranged on the second clamping plate, and the movable assembly is arranged on the support plate. The movable assembly comprises a movable plate and a first spring, a pressure control assembly is installed on the inner side of the second clamping plate, and the pressure control assembly comprises a first button and a threaded rod, the electronic element detection jig can prevent the electronic element from being loosened from the connector due to vibration or external force, the stability of circuit connection is guaranteed, and the detection efficiency is improved. The clamping force is controlled through the first button, the safety of the electronic element is guaranteed, when the electronic element is loosened, the electric bell is used for giving an alarm to prompt personnel to stop working, the electronic element and a connector are prevented from being damaged, then the working safety of the electronic element and the jig is guaranteed, and the clamping device is suitable for clamping when the electronic element is detected.

An intelligent electric bell comprises a reading circuit, a load element and a processor. The reading circuit is electrically connected to a bell circuit to be tested. The load element is electrically connected to the reading circuit. The processor is electrically connected with the reading circuit and the load element. The processor measures the reading circuit to obtain a first voltage value when the load element is in a closed state. The processor measures the reading circuit to obtain a second voltage value when the load element is in an on state. The processor calculates a voltage difference value based on the first voltage value and the second voltage value. And the intelligent electric bell judges that the electric bell circuit to be tested is provided with an electric bell in response to the fact that the voltage difference value is larger than a threshold value.

The present invention introduces an automatic loading system capable of switching aggregate varieties and a method for using the system, including a loading system and a logistics system; the loading system includes a finished product stacking shed, a double-layer rod valve, an electric fan valve, a feeding belt, a loading channel, a material distribution belt, a material distribution trolley, a truck scale, and a control cabinet; the logistics system is arranged at the loading channel, and the logistics system includes a control box, a sound system, an electric bell, a camera, a gate, a license plate recognition all-in-one machine, an LED screen, a traffic light, a laser radar, and a grating. The automatic loading system capable of switching aggregate varieties of the present invention and a method for using the system can realize multiple operation modes such as on-site, central control, and fully automatic; it automatically switches aggregate varieties, has a wide range of applications, does not require the driver to move the vehicle, improves loading and shipping efficiency, and has a good market prospect.

The utility model belongs to railway signal system technical field discloses a 6502 electric concentration voice alarm system mainly used to solve the problem that the existing bell fault alarm mode cannot quickly distinguish fault types and has low fault processing efficiency. The utility model prestores a plurality of customized voice alarm data based on different fault types in the voice control module. When the specific alarm relay in the 6502 electric concentration console is excited, the corresponding control relay of the alarm relay can be triggered to be excited synchronously, and then the corresponding control port in the voice control module is connected, so that the corresponding alarm voice broadcast is carried out through the voice power amplifier module and the loudspeaker. Compared with the traditional bell alarm mode, the system does not need technical personnel to check the console indicator light on site, and the voice directly broadcast fault type can effectively improve the fault identification efficiency, and also enable the technical personnel to instantly identify the core problem in the multiple fault concurrent scene, and significantly improve the emergency disposal efficiency.

The utility model discloses an anti-seismic support hanger system which comprises a top plate and a hanging rod, a supporting assembly is installed at the bottom end of the hanging rod, the supporting assembly comprises a supporting block and a supporting plate, a clamping assembly is installed on the supporting plate and comprises a sleeve plate and a clamping plate, a pushing assembly is installed on the inner side of the sleeve plate, and the clamping plate is installed on the clamping plate. According to the anti-seismic supporting and hanging bracket system, a spring can be used for pulling a clamping pin to fix the screw to the inner side of a fixing hole, the supporting and hanging bracket is prevented from falling off, and the anti-seismic supporting and hanging bracket system has the advantages that the anti-seismic supporting and hanging bracket system is simple in structure, convenient to use and high in practicability. When the button is separated from the roof due to looseness between the top plate and the roof, the electric bell is turned on to prompt personnel to reinforce in time, so that the fixing firmness and the use safety of the support hanger are guaranteed, and the support hanger can adapt to fixing and hoisting operation of equipment of different sizes and types and is suitable for hoisting and fixing equipment such as pipelines and cables.

The utility model discloses a 3D printing platform stripping structure which comprises a printing platform and an inner groove, the printing platform is provided with a stripping assembly, the stripping assembly comprises a movable plate and a groove, the inner side of the inner groove is provided with a lifting assembly, the lifting assembly comprises a motor and a lead screw, the inner side of the groove is provided with a connecting assembly, and the connecting assembly is connected with the movable plate. The connecting assembly comprises a screw sleeve and a clamping groove, a locking assembly is installed on the inner side of the clamping groove, and the locking assembly comprises a clamping pin and a spring. According to the stripping structure of the 3D printing platform, the movable plates can move downwards one by one, the force applied to products by stripping operation is reduced, the products are prevented from being damaged due to too large stress, and the safety of the products is guaranteed; and when the downward pulling force of the clamping pin on the movable plate through the clamping opening under the elastic force of the spring is not enough to overcome the adhesive force of the movable plate and the product, the electric bell is turned on, so that personnel are reminded to assist in stripping, the working safety of stripping equipment is guaranteed, and the device is suitable for stripping operation of the 3D printing platform.

The utility model discloses an explosion-proof electric bell with a mounting structure, which relates to the technical field of explosion-proof electric bell mounting and comprises an explosion-proof electric bell body, and a mounting component is arranged on the rear side of the explosion-proof electric bell body. The interior of the mounting assembly comprises a mounting plate which is arranged on the rear side of the anti-explosion electric bell body and has a T-shaped section, a first sliding groove is formed in the surface of the mounting plate, a first sliding block is slidably connected to the interior of the first sliding groove, and a mounting strip is connected to the surface of the first sliding block; and a plurality of fixing grooves are annularly formed in the surface of the mounting plate at equal intervals. According to the utility model, through the arrangement of the auxiliary assembly, the first sliding block and the first sliding groove, the mounting strip and the mounting hole can be driven to move, the mounting hole in the mounting strip can be moved to a specified position for mounting, and after the movement is completed, the fixing rod can be directly connected with the interior of the fixing groove through the action of the spring and the like; and therefore, the mounting strips and the like can be conveniently limited, and subsequent mounting is facilitated.

The utility model relates to the technical field of measuring instruments, in particular to an early warning system for safe operation of a cabinet position of an industrial gas cabinet, and aims to solve the problem that static pressure type and optical fiber type measuring devices and the like are conventionally adopted in the cabinet position detection process of the industrial gas cabinet at present. Usually, the cabinet position high-low limit alarm function of the industrial gas cabinet is limited and is easily interfered by lightning stroke and the like, and finally cabinet position measurement is not accurate. The system mainly comprises a radar level meter, a reflecting plate, a current detection safety barrier, an alarm, a PLC (programmable logic controller) and the like, and by adopting linkage of the integrated high-frequency radar level meter, the current detection safety barrier, the flash alarm and an electric bell, the operation safety of the cabinet position of the industrial gas cabinet is improved, the uncertain operation risk is reduced, and the safety of the industrial gas cabinet is improved. The fault and risk of the cabinet position can be predicted in time, operators are guided to make correct judgment and operation, equipment accidents are obviously avoided, the operation safety and efficiency of the gas cabinet are improved, and therefore the overall operation efficiency of the industrial gas cabinet is improved.

The utility model discloses an electrical automation equipment fault alarm device, relates to the electrical equipment field, and comprises a heat dissipation rack and a controller, the middle part of the heat dissipation rack is provided with a ventilation slot in a penetrating manner, the ventilation slot is internally provided with an exhaust fan used for heat dissipation, one side of the heat dissipation rack is provided with a vertical rod, and the vertical rod is provided with a through hole. And a positioning structure for adjusting the height position of the vertical rod is arranged on the side wall of the heat dissipation frame. A vertical rod is pulled up to drive an alarm bell to rise to a proper height, then a sound amplification cover is rotated to enable an opening of the sound amplification cover to face a personnel frequently-waiting area, after the internal temperature of the electrical equipment is increased to a heat dissipation preset value, a controller controls an exhaust fan to rotate to dissipate heat and drives hot air in the electrical equipment to be exhausted, and after the internal temperature is increased to an alarm preset value, the controller controls the exhaust fan to rotate to dissipate heat. The controller controls the alarm electric bell to give an alarm ringtone, the ringtone is spread towards a specified direction through the sound amplifying cover to give an alarm, effective heat dissipation can be achieved, directional high-pitch alarm can be achieved, and multifunctional use of the device is achieved.

1. The name of this design product: explosion-proof electric bell. 2. Purpose of this design product: used to sound an alarm in explosive environments. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

The utility model discloses a marine alarm bell, and specifically relates to the technical field of marine alarm bells, the marine alarm bell comprises an external impact type electric bell assembly, the bottom end of the external impact type electric bell assembly is provided with a cast iron assembly, the cast iron assembly comprises knocking cast iron, and the center of the front surface of the knocking cast iron is rotatably inserted with a rotating shaft; the marine alarm bell can regularly clean a shell knocking cast iron by controlling the sleeving scraper to rotate, so that a rust layer is prevented from being formed on the outer surface of the knocking cast iron in a humid and salt mist environment on the sea, the situation that the outer surface of the knocking cast iron is corroded is further avoided, and when the knocking hammer strikes the knocking cast iron, the sound made by the knocking hammer is always clear, and the service life of the knocking hammer is prolonged. And meanwhile, when the sleeving scraping plate rotates, the conveying pipe and the atomization spray head can be driven to rotate, the atomization spray head is opened, the atomization spray head can spray an anti-rust agent to the outer surface of the knocking face of the cast iron assembly in an all-around mode when rotating, and knocking cast iron can adapt to the high-humidity and high-salt-mist environment.

The utility model relates to the technical field of vulcanizing machine monitoring, in particular to a vulcanizing machine state real-time monitoring device which comprises a shell and a fixing plate, a fault display screen is fixedly connected to the front side of the shell, an electric bell alarm is fixedly connected to the upper side of the shell, two bottom frames are fixedly connected to the bottom of the shell, and a lead screw is rotationally connected to the middle of the position between the two bottom frames. A sliding rod is fixedly connected to the front portion between the two bottom frames, a sweeping assembly is arranged on the outer side of the sliding rod, a mounting plate is fixedly connected to the left side of the shell, two mounting holes are formed in the mounting plate, a fixing plate is fixedly connected to a wall through bolts, a control box is fixedly connected to the upper side of the fixing plate, and a plurality of relays are arranged in the control box. According to the monitoring device, the fault display screen and the bell alarm are arranged, and the relay is electrically connected with the vulcanizing machine, so that an operator can be effectively and accurately prompted that a certain vulcanizing machine breaks down, and the purpose of early prompting and early processing of the fault of the vulcanizing machine is achieved.

1. The name of the design product: carbon dioxide indicating lamp bell. 2. The use of the design product: used as a carbon dioxide indicating lamp alarm bell device for ships. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.

The utility model discloses a middle-distance running circle counting reminding device, and belongs to the field of track and field competition articles. The remote controller comprises a base, a supporting rod, a display screen, a remote controller and an electric bell, the supporting rod is fixedly arranged on the base, the display screen is rotationally connected with the supporting rod, the electric bell is fixedly installed on one side of the display screen, the remote controller is provided with number keys, setting keys, a circle counting key and a bell ringing key, and the keys are electrically connected with a coding circuit through a key circuit. The coding circuit is electrically connected with the remote signal emitter, the remote signal emitter sends signals to the remote signal receiver, the remote signal receiver is electrically connected with the single-chip microcomputer, and the single-chip microcomputer is electrically connected with the display screen and the electric bell. According to the utility model, the number of rest circles of a match of an athlete is measured, and the athlete is reminded, so that the athlete can keep high concentration on the match, keep high competitive level and obtain better results.

The application discloses a dry quenching circulating fan safety state monitoring and early warning device and an early warning method thereof, belongs to the field of dry quenching circulating fans, and is characterized in that a first vertical vibration speed sensor, a first horizontal vibration speed sensor and a first axial vibration speed sensor are arranged at a non-load end of the circulating fan and connected to a controller; a second vertical vibration speed sensor, a second horizontal vibration speed sensor and a second axial vibration speed sensor are arranged at a load end of the circulating fan and connected to the controller; the controller is connected with a flashing alarm, the input end of the flashing alarm is connected with a corresponding alarm loop of the controller, and the output end of the flashing alarm is connected with a bell, a confirmation button, a pilot lamp button and a test button respectively. The application adopts a multi-channel array combination structure to install the flashing alarm to form a light-emitting matrix alarm system, when a certain parameter exceeds a limit, a corresponding loop can send out flashing and audible alarms. Moreover, the application can provide alarms caused by simultaneous exceeding of several process parameters.

The utility model relates to the technical field of radiation dose, in particular to a radiation dose protection instrument with an alarm function, which comprises a frame body assembly, the frame body assembly comprises a shell, sound holes are respectively arranged on two sides of the shell, the sound holes are used for transmitting sound and preventing skid, one end of the outer surface of the shell is fixedly connected with a mounting seat, and the mounting seat is fixedly connected with the shell. A detection assembly is fixedly connected into the shell and comprises a knocking alarm which is used for reminding a user to pay attention, the installation base is in threaded connection with a Geiger pipe, the Geiger pipe is externally arranged and directly makes contact with air, and the other end of the installation base is electrically connected with a signal amplifier which is used for amplifying electric signals input by the Geiger pipe. According to the radiation dose protection instrument with the alarm function, the electric bell can give out loud and unique sound, compared with sound of a common buzzer and the like, the volume and the tone of the electric bell can more easily attract attention of people, a good warning effect can be achieved in a noisy environment, and the sound production structure of the electric bell is relatively simple and stable.

The invention relates to a circuit current-limiting alarm method and device, and belongs to the technical field of circuit protection, and the circuit current-limiting alarm device comprises a housing, a circuit board fixedly installed in the housing, and two interfaces arranged at one side of the housing and used for connecting positive and negative electrode lines. The series-connected bulbs are used as current-limiting resistors, the electromagnets of the electric bells connected in parallel effectively reduce the resistance of the lamp filaments when the lamp filaments do not emit light, if external equipment is short-circuited, the bulbs are used as electric appliances to bear voltage and give out light to give an alarm, and different brightness and colors can represent serious short-circuit conditions. The electric bell can work under the voltage to give a sound alarm and repeatedly cut off the current at the same time, the wireless transmitting module can also work by utilizing the voltage to give a wireless alarm to indicate a short-circuit line, the voltage of an electric device can be reduced after an alarm mechanism such as a bulb runs, the electric device is subjected to current limiting protection, and the service life of the electric device is prolonged. The bulb and other alarm mechanisms do not need to be replaced after alarming, the normal mode is automatically recovered after short circuit is eliminated, and the later maintenance cost is reduced.

The utility model discloses a detector fixing seat which comprises a detector and a fixing seat body, a sealing assembly is installed on the fixing seat body and comprises a taper sleeve and a rubber sleeve, a clamping assembly is installed on the inner side of the taper sleeve and comprises a sliding rod and a clamping pin, a pulling assembly is installed on the inner side of the sliding rod, and the clamping pin is installed on the outer side of the sliding rod. The pulling assembly comprises a screw rod and a rotating plate, an anti-loosening assembly is installed on the screw rod, the anti-loosening assembly comprises a thread sleeve and a second spring, and the detector fixing seat can keep the installation firmness of a detector and prevent the detector from loosening by means of the elastic force of the second spring to the thread sleeve when the screw rod is loosened due to vibration; and meanwhile, the sealing effect of the taper sleeve and the rubber sleeve on the pipeline is guaranteed till the thread sleeve is pushed to the button, reminding work is conducted through the electric bell, personnel can conduct fastening in time, the situation of pipeline leakage caused by installation looseness is avoided, the sealing effect on the pipeline is guaranteed, and the detector fixing device is suitable for being used for installing and fixing the detector.

The invention discloses an explosion-proof electric bell. According to the technical scheme, the anti-explosion bell comprises a base, a shell arranged on the base and a bell bowl arranged above the shell, the shell is provided with an anti-explosion knocking mechanism assembly used for knocking the bell bowl, and the anti-explosion knocking mechanism assembly comprises a motor and a first anti-explosion shaft sleeve arranged on an output shaft of the motor in a sleeving mode. A mounting plate is arranged at the lower end of the first explosion-proof shaft sleeve, a mounting frame is arranged at the upper end of the first explosion-proof shaft sleeve, a first screw connected with the motor and a second screw connected with the shell are arranged on the mounting plate, and movable metal knocking rings are arranged at the two ends of the mounting frame through fixing shafts; the anti-explosion bell has the advantages that the direct-current motor is adopted to drive the two metal knocking rings to knock the bell bowl to find sound, the direct-current motor is not prone to generating electric arcs, and the anti-explosion shell structure is combined, so that the anti-explosion performance is better.

The utility model discloses a pendant type electric bell seismograph, which comprises a shell and an electric bell assembly, the top and the bottom of the shell are respectively covered with an upper cover and a lower cover, the top and the bottom of one side of the shell are respectively provided with a fixed support, and the top and the bottom of the interior of the shell are respectively provided with an upper insulating ring and a lower insulating ring. The two sides of the top of the upper insulating ring are both provided with first wiring piles, the middle position of the top of the lower insulating ring is provided with a conductor embedded part, one side of the top of the lower insulating ring is provided with a second wiring pile, and the top of the second wiring pile and the tops of the first wiring piles are jointly connected with an outgoing wire. The pendant type electric bell seismograph is small and exquisite in overall structure, suitable for household use and convenient to install, can be installed on a wall body and can also be buried underground for use, an integrated dual-purpose installation method is achieved, and convenience and flexibility of installation and use of the pendant type electric bell seismograph are improved.

1. Name of the product of this design: Electric bell. 2. Purpose of this design product: teaching aid for physics experiments. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

The utility model discloses a grinding file manufacturing structure with a warning effect, and aims to provide a grinding file manufacturing structure with a warning effect, which is provided with a component capable of opening attention to the surrounding environment and giving prompt information in time. The multifunctional file comprises a connecting piece, a transmission structure, an outer file pipe and a file head, the bottom end of the file head is connected with the outer file pipe, a warning installation shaft and a plurality of file blocks are installed on the file head, a first distance sensor and a plurality of second distance sensors are installed on the warning installation shaft, and a switch assembly and a single chip microcomputer are installed on the transmission structure. An alarm bell is installed on the warning shaft of the connecting piece, the first distance sensor and the second distance sensor are both electrically connected with the single-chip microcomputer, and the single-chip microcomputer is electrically connected with the alarm bell. The beneficial effects of the utility model are that: the purpose of installing a part capable of starting attention to the surrounding environment and giving prompt information in time can be achieved; the effect of preventing foreign objects from entering the human body structure can be achieved; and the effect of automatically adjusting the rotating speed is achieved.

The invention relates to the technical field of coal mine tunnel guniting operation, in particular to a feeding guniting machine which comprises a frame platform and a control system, crawler walking devices are jointly installed on the two sides of the lower surface of the frame platform, laser radars are arranged at the front ends and the rear ends of the two sides of the frame platform, and electric bells are arranged in the middles of the front ends and the rear ends of the frame platform. Scram buttons are arranged at four corners of two sides of the frame platform, and a guniting device is arranged in the middle of the rear end of the upper surface of the frame platform. The device is used in cooperation with a downstream guniting robot (mechanical arm), a practical intelligent guniting operation system can be formed, intelligence of guniting operation is achieved, only one worker is needed for equipment operation, an operator can be away from the equipment in the whole guniting operation process, harm to a human body by a severe environment is avoided, personal safety is guaranteed, and the working efficiency is improved. Compared with existing equipment, the working efficiency is obviously improved, and staff reduction and efficiency improvement are achieved.

Provided is a doorbell system, including an indoor terminal, an outdoor terminal, and a power supply (100). The indoor terminal includes a bell controller (220) and an indoor bell (210) which are connected in parallel; the outdoor terminal includes an outdoor doorbell (310) and an outdoor switch (320); the indoor terminal, the outdoor terminal, and the power supply (100) are connected in series to form a closed loop; in response to the outdoor switch (320) being switched off, the bell controller (220) is turned on, the indoor bell (210) is short-circuited, and the power supply (100) powers the outdoor doorbell (310); and in response to the outdoor switch (320) being switched on, the bell controller (220) is turned off, and the power supply (100) powers the indoor bell (210).

The utility model discloses an electronic fence acousto-optic voice alarm system in the field of safety protection. The electronic fence acousto-optic voice alarm system comprises an outer-layer alarm system and an inner-layer alarm system. And the outer layer alarm system comprises a plurality of groups of first infrared correlation alarms and second infrared correlation alarms which are configured in pairs, and infrared beams emitted by the first infrared correlation alarms and the second infrared correlation alarms are mutually correlated to form an electronic barrier. The electronic barriers are connected end to end to define an operation area, and an inner-layer alarm system is arranged in the center of the operation area. The inner layer alarm system comprises a control cabinet, an acousto-optic voice prompter and an electric bell. The acousto-optic voice prompter and the electric bell are both electrically connected with the control cabinet. According to the utility model, the outer-layer alarm system and the inner-layer alarm system are arranged, so that the alarm effect is improved, and the alarm information transmission efficiency is high.