292 results about "Safety relay" patented technology

Safety level error detection comparable to that provided by redundant wired safety relays is obtained on a backplane of a programmable logic controller or the like by a combination of error detection methods that in sum provide the requisite level of error detection required without necessitating a particular hardware requirement or duplicative message transmissions.

A safety relay system includes one or more additional input units each for sending safety input from a safety component, a master unit for receiving the safety input from the additional input unit and providing safety output to operate a safety relay based on the safety input, a safety information line for transferring safety information between the units, a non-safety information line for transferring non-safety information separate from the safety input, the non-safety information being information concerning an operation state of each safety component or each unit, and a non-safety information output section for outputting the non-safety information transferred on the non-safety information line.

The invention discloses a safety chain system of a wind generating set and a fault rapid identification method thereof. According to different safety chain trigger objects, a non-intelligent safety relay and a conventional relay are adopted to construct a safety chain loop by a hard-wired series mode so as to form a unit safety system; the state of the safety system is effectively monitored; for the same protected object, the safety chain loop adopts a redundancy design mode; and at least two independent safety chain protection connection points can simultaneously operate, so that the state of effectiveness loss of the safety chain, which is caused by output adhesion of a certain equipment object protection relay connection point, can be more effectively prevented. The safety chain system of the wind generating set and the fault rapid identification method thereof, which are disclosed by the invention, are simple to implement, effective to monitor and low in cost; and meanwhile, the safety and reliability of the safety chain system of the wind generating set are protected by adopting a multilevel protection mode.

The invention discloses a load-off method of billboard wind power loading, the handle process is: A. measure the wind speed in real time, changing the wind speed into electric control signal; B. Anemometry instrument comparison circuit composes the electric control signal with the control of parameter which is pre-established, controlling the running of the motor by the relay; C. The electric motor drive the vane of the shutter billboard plate to do angular adjustment. This invention of the billboard against strong wind, the plate face is shutter and set with electromagnetism lock implement, the live shaft of each vane on the plate face are set on the transmission mechanism; the electric motor assembles transmission mechanism by the reducer ,the anemometry instrument is equipped with the safety relay and the replacement relay , two relays link the positive and negative rotate control circuit of the electric motor respectively , the safety relay links with blade electromagnetism lock implement; setting regular location arriving limit switch and revolving arriving limit switch on the transmission mechanism respectively. The invention can realize the load-off of the billboard wind power loading, improved the resistivity ability against the strong wind of the outdoor billboard.

The invention discloses a full-electronic security computer interlocking system. The full-electronic security computer interlocking system comprises a special railway security computer, an interlocker, a control and display machine and an electronic executing unit subsystem, wherein the special railway security computer comprises two security computers as a master computer and a spare computer; each security computer comprises a CPU (central processing unit) board and multiple communication boards; data transmission and data synchronization between a first CPU module and a second CPU module of the CPU board are finished through a two-port RAM (random access memory) and interrupt operation; the CPU board and the communication boards in a same system exchange data through the two-port RAM and the interrupt operation; during system operation, the first CPU module and the second CPU module output control signals for driving a master relay; and a normally open contact of the master relay is used for controlling acting power of onboard safety relays of all the communication boards. By a working method of the full-electronic security computer interlocking system, the special railway security computer can achieve functional safety of a double 2-vote-2 platform, can achieve short-period task-level synchronization of a single computer and two computers, and can achieve seamless handover under fault conditions.

The invention discloses a signal energy synchronous transmission relay transmission method in physical layer safety communication. The method comprises the following implementation steps that: 1) a source node transmits an energy signal and calculates an optimal energy collection time scale alpha<H>, and an unreliable relay node and a destination node collect energy; 2) in a first (1-alpha<H>)T/2 time slot, the source node transmits an information signal x<s>, the destination node transits an interference signal x<z>, and the unreliable relay node receives the signals; 3) in a second (1-alpha<H>)T/2 time slot, the unreliable relay node forwards the received mixed signals, and the destination node receives the signals; 4) the destination node performs adaptive interference cancellation for the mixed signals forwarded by the unreliable relay node, and performs information detection on the signals of which interference is cancelled. The method provided by the invention can effectively prolong network service life of a relay network, and has low implementation complexity and high transmission safety, thus, the method can be used for a physical layer safety relay collaborative communication system.

The invention discloses a computer interlocking system and an operation method thereof. The interlocking system comprises an interlocking machine, a communication gateway, a turnout execution unit, a signal execution unit and a track execution unit, wherein the turnout execution unit comprises a first action controller, a second action controller, a directional operation control ciruit, a reversed operation control circuit, a safety relay and a select switch, wherein the first action controller and the second action controller are used for controlling a group of switching tubes respectively arranged on the directional operation control circuit and the reversed operation control circuit, alternating current is input into the directional operation control circuit and the reversed operation control circuit and is controlled by the normally-open switch of the safety relay, the select switch is in communication connection with the first action controller, the second action controller and a signal collecting unit, and output of the first action controller, the second action controller and the select switch controls the safety relay by means of logical relation treatment. The invention uses the switching tubes to replace relays in the existing system, and adopts one safety relay and one select switch to ensure high reliability of the turnout execution unit, thereby greatly reducing cost of the whole system on the premise of ensuring the high reliability.

A system to reduce standby losses in a hot water heater is presented. The system utilizes a dual safety relay valve between the combination gas controller and the burner. The dual safety relay valve bypasses gas to a rotary damper actuator valve to position a damper flapper valve located over/inside the flue pipe. Once the flapper valve has opened to ensure combustion, the gas is allowed to flow back to the dual safety relay valve. Some of the bypass gas may be diverted to boost the pilot or to supply a booster. The dual safety relay valve is then opened to allow the gas supply to the burner. Once the burner is turned off, bypass gas bleeds out of the rotary damper actuator valve to close the damper flapper valve to reduce standby losses through the flue pipe, and to allow the dual safety relay valve to close tightly.

The invention discloses a computer interlocking system and a working method thereof, wherein the computer interlocking system comprises an interlocking machine, a communication gateway and a turnout, signal and railway execution unit; the signal execution unit comprises a signal lamp control unit, a protective unit and a signal acquisition unit, wherein the protective unit comprises a logic protection unit and a signal safety relay, the logic protection unit receives first signal state information and second signal state information respectively output by a first signal controller and a second signal controller, and the first signal controller, the second signal controller and the logic protection unit all receive system feedback information acquired by the acquisition unit; the first signal state information, the second signal state information and the system feedback information are logically compared by the logic protection unit through hardware, and a signal lamp abnormal signal for controlling the signal safety relay is output according to a comparison result; and under the condition that the signal lamp abnormal signal is output, the signal safety relay is only controlled by the signal lamp abnormal signal, so that the signal execution unit is led to be safe from faulty.

A system to reduce standby losses in a hot water heater is presented. The system utilizes a safety relay valve between the combination gas controller and the burner. The safety relay valve bypasses gas to a damper actuator valve to position a flapper valve located over the flue pipe. Once the flapper valve has opened to ensure combustion, the gas is allowed to flow back to the safety relay valve. Some of the bypass gas may be diverted to boost the pilot or to supply a booster. The safety relay valve is then opened to allow the gas supply to the burner. Once the burner is turned off by the combination gas controller, the small amount of bypass gas bleeds out of the damper actuator valve to close the flapper valve to reduce standby losses through the flue pipe, and to allow the safety relay valve to close tightly.

A relay having a base on which is arranged an electromagnetic system that actuates at least one pair of closing contact springs and at least one pair of opening contact springs where actuation is effected by a slide having actuation lugs located at different heights relative to the fixing of the active spring contacts for actuating the active opening spring contacts at a height different from that of the active closing spring contacts so that the characteristic curve of the magnetic system can be better adjusted to that of the spring contacts.

The invention discloses a wind generating set safety chain control system. The wind generating set safety chain control system comprises a master control programmable logic controller (PLC), a pitch system, a converter system, a yaw system, a rotor braking system, a power device, a plurality of failure nodes and a plurality of safety relays. An output end of the power device is respectively connected with the pitch system, the converter system, the yaw system and the rotor braking system through different relays. The wind generating set safety chain control system further comprises a safety PLC, the failure nodes are respectively connected with an input end of the safety PLC, and coils of the plurality of safety relays are respectively connected with an output end of the safety PLC. The wind generating set safety chain control system can accurately locate different failure information and dispose the different failure information in a specific mode.

The invention relates to a laser detection and control system for barriers between a shield door of a metro platform and a train door, comprising a monitoring unit, a control unit and an alarm unit, wherein, the controller comprises a CPU module, a liquid crystal terminal, a signal isolator, buttons and a safety relay; generating lasers are respectively installed on a front bracket, and a laser receiver or a laser reflection plate is installed on a rear bracket corresponding to the front bracket; the control ends of the generating lasers are connected with the output end of the controller, and the output end of the laser receiver is connected with the input end of the controller; the corresponding output end of the controller is correspondingly connected with the control input end of the shield door; and the corresponding output end of the controller is connected with a buzzer and a caution light of the platform. The laser detection and control system realizes the intelligent operation of judging the existence of barriers between the shield door of the metro platform and the train door, has the advantages of compact integral structure, reasonable cost, easy and convenient installation, simple and intelligent operation, stable and reliable performance, higher practicability and favorable development prospect, and is applicable to metro platform.

A safety relay for supervising and ensuring safe operation of a machine industrial process and corresponding safety devices and actuators. The safety relay has at least one input, which is monitored for short circuits and open circuits, for connection to said safety devices and actuators, at least one output for connection to said machine or process, one or more than one stop relay for maintaining and interrupting, respectively, the connection to said machine or process depending on a momentary status of said safety devices and actuators, and a reset circuit with at least one capacitor and a reset input. The capacitor receives and stores electrical energy in a first state, while discharging the electrical energy in a second state for resetting the safety relay to a normal state of operation. The safety relay also has first means connected to the capacitor, the first means establishing, in a first state, a closed current path between a first and second supply conductor for charging the capacitor, and, in the second state, the first means isolating the capacitor from the second supply conductor. Second means are arranged in parallel to the capacitor for conducting current, in the second state, from the capacitor via the second supply conductor to the relay coils in the stop relays for resetting the safety relay.

The invention discloses a signal execution unit of a computer interlocking system and a working method thereof. The execution unit comprises a signal lamp control unit, a protective unit and a signal acquisition unit, wherein the protective unit comprises a logic protective unit and a signal safety relay; the logic protective unit receives first signal state information and second signal state information which is output by a first signal controller and a second controller respectively and represents the working state of each signal lamp control unit; the first and second signal controllers and the logic protective unit receive system feedback information acquired by the signal acquisition unit; the logic protective unit performs logical comparison on the first and second signal state information and the system feedback information through hardware, and outputs a signal lamp abnormal signal for controlling the signal safety relay according to a comparison result; and under the condition that the signal lamp abnormal signal is output, only the signal lamp abnormal signal is used for controlling the signal safety relay to ensure that the signal execution unit finishes fault oriented safety.

The invention relates to a device for monitoring foreign matters between a rail transit platform door and a train based on machine vision, wherein the device collects visible light images, infrared light images and depth images between the rail transit platform door and the train, integrates the visible light images, the infrared light images and the depth images to form three-dimensional space three-dimensional images, which can cover all targets in a shooting visual angle; events can be identified in the images by analyzing the data of the three-dimensional images, wherein the main events comprises: whether or not foreign objects exist in the track area, whether or not the train is at the station, the number of trains, the switch status of the platform door and the train door, the door seam of platform sliding door and train door, whether or not foreign objects inrude into the portion between the train and the platform door, the size and type of foreign objects, whether or not the foreign objects affects driving safety and the like; the device drives the foreign object alarm safety relay, and transmits the monitoring result and live real-time image in real time. The device can achieve no dead angle and full-area detection in an area, is not influenced by vehicle type, gap space size, vibration and environmental illumination, is suitable for underground, ground and ground platform environments, and is suitable for unmanned environments.

The invention discloses a turnout execution unit of a computer interlocking system and a working method thereof. The turnout execution unit comprises a first action controller, a second action controller and a directional-operation and reverse-operation control circuit controlled by the first action controller and the second action controller, and the turnout execution unit also comprises a safety relay and a select switch; the first action controller and the second action controller are used for controlling a group of switching tubes on the directional-operation and reverse-operation control circuit; the AC input directional-operation and the reverse-operation control circuit is controlled by a normally-opened switch of the safety relay; the select switch is in communicating connection with the first action controller, the second action controller and a signal acquisition unit; and the first action controller, the second action controller and the output of the select switch process and control the safety relay through And logic relationship. By changing a relay in the traditional system into the switching tube, the invention ensures the high reliability of the turnout execution unit through the safety relay and the select switch and greatly reduces the cost of the whole system on the premise of ensuring the high reliability.

The invention provides a protecting device for preventing an elevator cage from accidently moving. The protecting device for preventing the elevator cage from accidently moving comprises a cage monitoring system, a first safety relay and a second safety relay, wherein the cage monitoring system is connected with the first safety relay and the second safety relay; the cage monitoring system is used for monitoring the position information and the speed information of the elevator cage and respectively outputting the position information and the speed information to the first safety relay and the second safety relay; the first safety relay and the second safety relay are used for performing safety control on the elevator cage according to the position information and the speed information of the elevator cage. The protecting device for preventing the elevator cage from accidently moving provided by the invention can reduce the potential safety hazard caused by the accident moving of the elevator cage and can increase the whole safety performance of the elevator.

The present invention relates to an intermediate module capable of being implemented in conjunction with a safety isolation system, as well as a control system employing such an intermediate module and related operational method. In one embodiment, the intermediate module includes a first input terminal capable of receiving a first signal from an additional device that is at least one of the safety isolation system and another device, and a first output terminal capable of providing a second signal to a controlled device. The intermediate module additionally includes at least one safety relay circuit that receives at least one of the first signal and a first intermediate signal based upon the first signal, and that generates in response at least one of the second signal and a second intermediate signal upon which the second signal is based. The safety relay circuit includes at least one redundant circuit component.

The invention discloses a working method of a secure computer specially used for railways. The computer comprises two secure computers which are respectively used as a principal machine and a standby machine; each secure computer comprises a CPU (Central Processing Unit) board and a plurality of communication boards, wherein data transmission and synchronization between a first CPU module and a second CPU module of the CPU board are completed through a double-port RAM (Random Access Memory) and interrupt operation; the data exchange between the CPU board and the communication board positioned in a same system is completed through the double-port RAM and the interrupt operation; the first CPU module and the second CPU module output control signals used for driving a general control relay during the operation of the system, and the normally open contact of the general control relay is used for controlling onboard secure relays and active power supplies of all the communication boards. The working method disclosed by the invention can realize the functional security of a square two-out-of-two architecture platform through the secure computer specially used for the railways, realize the synchronization of the short-period task levels of the system and double systems and achieve seamless switching under the condition of a fault.

The invention discloses a safety chain control system, which comprises an overspeed monitoring relay and a safety relay which are connected between a control box and an axle box, wherein the overspeed monitoring relay detects whether a PLC control system has a fault; and the safety relay detects whether an I/O end of the PLC control system has input/output signals. The safety chain control system has the following advantages that: a double safety chain control system is adopted, the normal operation of the PLC control system must be met before a master control system sends a pitch-controlled starting signal, and a pitch-controlled system can be started, so the safety and the reliability of the system are ensured, and the work efficiency is improved.

The invention provides a safe relay module tester which comprises a mechanical structure portion and a circuit portion. The safe relay module tester is characterized in that a beam is fixed on a base through two vertical beams, a lifting arm is fixed on the beam through a supporting frame, an upper movable board is fixed at the lower end of the lifting arm, a lower bearing board is fixed on the base, a plurality of conducting probes which are matched with wiring terminals and testing points of a PCB board of a safe relay are fixed on the lower bearing board, and a plurality of pressing rods which exert pressure on the PCB board of the safe relay are fixed on the lower surface of the upper movable board. The tester can effectively and rapidly fix a safe relay module, and can rapidly and accurately achieve measurement of performance of the safe relay module. When an inferior-quality product appears, inspection personnel can be reminded of the inferior-quality product through a sound-light alarm signal, and detection efficiency of the safe relay module is effectively improved. The safe relay module tester has the advantages of being novel in structure, easy to operate, high in work efficiency and convenient to apply and popularize.