41results about How to "Improve safety production performance" patented technology

The invention provides a mine ventilating fan control system capable of automatically adjusting air quantity. The mine ventilating fan control system comprises a frequency conversion system, a programmable logic control (PLC) system and an inspection and monitoring system. The frequency conversion system comprises a power source wire leading-in device, a power source feed device and a frequency converter. The PLC system comprises a control power source wire leading-in device, a control power source feed device and a PLC device. The inspection and monitoring system comprises an operating platform, a display screen, a wind pressure transducer, a vibration transducer, a temperature transducer, and the like. A closed-loop control link is set in the PLC device, and the output frequency of the frequency converter is controlled by taking ventilating condition signals of a working face, which are acquired from the sensors or a mine local area network, as closed-loop feedback signals according to a difference between a set value and a practical sampled value, so as to automatically adjust the air quantity of mine ventilating fans. Two sets of facilities with relative independence are arranged in a speed adjusting link, the control link, an inspection link and an operating link to respectively perform control and online inspection on the two mine ventilating fans, so that the mutual switchover of the two mine ventilating fans from working to standby can be completed in a short time.

The invention belongs to a control technique for mine hoists, and provides a method for completely unloading mineral aggregates from a skip, The method comprises the following steps that: a fixed interval is set; when a hoist is in an absolute releasing state, and an unloaded skip enters into the fixed interval at a constant speed, the current of a major loop is continuously sampled and read in a circulating mode; through comparing an actually-measured value with a reference value, whether the unloaded skip is empty is determined, if the unloaded skip is not empty, a master controller sends a signal for indicating that the unloaded skip is not empty to a loading station controller and a monitoring system, the loading station controller sends a command for closing a weighing hopper valve, and the unloaded skip enters the shaft bottom and is no longer loaded, then the unloaded skip continues going upwards to be unloaded for the second time, and the working procedure above is repeated until the unloaded skip is empty. By using the method disclosed by the invention, a situation that a main shaft hoist runs in an overload or severe overload mode is avoided, the occurrence of serious accidents caused by the severe overload of the hoist is reduced or avoided, and the safety production capacity of a main-shaft hoisting system is increased.

The invention belongs to mine lifting control technologies and provides a lifting control device with a skip emptying function. The lifting control device with the skip emptying function comprises an operating control system for automatically controlling a running process of a lifting system, a speed-adjusting system and a monitoring system, wherein the speed-adjusting system is used for supplying electricity to a motor and adjusting and controlling a running speed of an elevator, and the monitoring system is used for operating and monitoring a running process of the lifting control device. A fixed interval is arranged in a hardware mode or a combination mode of hardware and software; the elevator is in a full brake release state, and when a skip enters the set interval at a constant speed, sampling reading is continuously performed to current of a speed regulator in a circulating mode, and whether the skip is emptied is judged; and if the skip is not emptied, adopted corresponding measures are continuously taken to unload the skip which is not emptied. The lifting control device with the skip emptying function improves safe production capability of the lifting system, eliminates lifting intermittent time during the loading process of the skip, and improves production efficiency.

The invention relates to a spray drying system for wall-attaching materials, and relates to the technical field of material drying. According to the invention, a layer of air wall wind with adjustable temperature, humidity and air volume is directly formed at the power-attaching part in a tower, the temperature and the humidity of the air wall wind are lower than the thermal boning temperature and the moisture absorption humidity of powder and particle materials, the air wall wind and the wind in the tower are finally mixed to form mixed wind, the temperature and humidity of the mixed wind are lower than the thermal boning temperature and the moisture absorption humidity of the powder and particle materials, and the temperature of the particle materials under the action of air wall wind before contacting the tower wall is lower than the thermal boning temperature. With the adoption of the system provided by the invention, three wall-attaching conditions of materials can be solved or reduced, and the effects of improving the production efficiency, improving the per unit yield, reducing energy consumption, prolonging the continuous production time, improving the production safety and the improving the quality of a product are achieved through high air inlet temperature.

The invention aims to provide a process of producing diphenyl carbonate by non-solvent method. The process can improve the quality of proeducts and also reduce the production cost of products and the waste discharge. The method comprises the following steps: melting phenol, and heating up to 110-130 DEG C; adding DMF or N,N-dimethylaniline or analogs thereof as catalyst in an amount of 0.03-3% of phenol; maintaining the temperature, and introducing phosgene for photochemical reaction while stirring; heating up to 140-180 DEG C and maintaining for 1-5 hours; and performing reduced pressure distillation to obtain the final product. The new process provided by the invention improves the quality and yield of products, completely eliminates sodium chloride mother liquid and waste water and reduces distillation residues, reduces the production cost, and achieves the purpose of clean production. The operation of phenol system recovery and the procedure of ingredients are reduced, the production efficiency is greatly increased, the operation is more stable, and the safety of production is improved.

The invention provides a turbine heater which comprises an air inlet passage, a steam inlet pipe and a hot air outlet passage. Air and steam enter a mixing chamber through corresponding pipelines to be mixed; the mixing chamber is positioned in a host housing; the air inlet passage is connected with the host housing in a sealing manner; steam spray nozzles are arranged at the end part of the steam inlet pipe, which is positioned in the host housing; the steam spray nozzles are uniformly distributed into a strip arc shape along the periphery of the steam inlet pipe; centrifuge blades are uniformly distributed on the peripheries of the steam spray nozzles; the tangential direction of each arc steam spray nozzle outlet passage is opposite to that of each arc centrifuge blade; a centrifugal impeller consisting of the centrifuge blades is connected with a rotating shaft by a fixing part; the maximum included angle alpha between the tangential direction of an outlet of each steam spray nozzle outlet passage and a string of each arc centrifuge blade is 90 degrees; and a demister is arranged in the host housing or in the hot air outlet passage. The turbine heater adopts steam as a heating source and a fan power source, enables the air to be directly heated, and does not require a heat exchanger and an electric motor so as to overcome the defects in the prior art.

The invention discloses a steam-driven lubricating oil pump emergency oil supply system and a method thereof. The steam-driven lubricating oil pump emergency oil supply system comprises an emergency steam source, an automatic power-losing emergency starting system, a drive turbine, a centrifugal oil pump body and an experiment system. The steam inlet end of a turbine body is connected to the emergency steam source, and the automatic power-losing emergency starting system is arranged on a steam pipe connected with the emergency steam source. The drive turbine is coaxially connected with the centrifugal oil pump body. The automatic power-losing emergency starting system comprises an electromagnetic pneumatic linkage door and a quickly-closing main steam door which are connected in series. By means of the steam-driven lubricating oil pump emergency oil supply system and the method, the reliability of an emergency pneumatic oil pump is guaranteed, lubricating oil can be effectively provided when turbine accidents occur, a rotor can stop walking safely in the idling curve time, occurrence of serious accidents is prevented, and the safety production performance of a power plant is improved.

The invention belongs to leakage detection technology, and relates to an H-Q characteristic curve-based pipeline breakage and leakage positioning method. The method is characterized by comprising steps A and B, wherein the step A comprises four sub-steps for initialization; and the step B comprises six sub-steps for monitoring and positioning to finish pipeline breakage and leakage positioning. The H-Q characteristic curve-based pipeline breakage and leakage positioning method has the advantages of performing timely and accurate judgment and positioning on the breakage and leakage of a pipeline running under a complex working condition so as to maximally reduce damage caused by the breakage and leakage of the pipeline, and simultaneously improving the security and the reliability of production running to ensure that each production process on the ground realizes continuously and stably running and fulfill the aims of saving energy, reducing consumption and improving economic benefit.

The invention relates to the technical field of safety control of mines, in particular to an underground man and machine positioning and slope ramp signal system, which can position underground personnel and equipment, controls signal lamps of a slope ramp vehicle in real time according to the position of the vehicle and comprises a man and machine positioning subsystem and a slope ramp signal subsystem. The man and machine positioning subsystem comprises mobile information terminals, a base station I and a server I; the server I is used for receiving information, which is acquired by the base station I, of the mobile information terminals and positioning and recording the personnel with the mobile information terminals and equipment with the mobile information terminals; and the slope ramp signal subsystem comprises a vehicular information platform, a base station II and a server II, the server II is used for receiving information, which is obtained by the base station II, of the vehicular information platform, positioning the vehicle with the vehicular information platform and controlling states of corresponding signal lamps on a slope ramp according to the position of the vehicle. The underground man and machine positioning and slope ramp signal system can effectively improve safety production ability of a mine, and strengthens supervision to the personnel into the mine and supervision to the environmental monitoring equipment.

A production scheduling and safety management and control system comprises a system hardware and network platform, and the system hardware and network platform collects production related data and transmits the data to a database management system platform. The system is characterized by also comprising a production scheduling subsystem, a safety management and control subsystem, an emergency management subsystem and a production and operation integrated display subsystem; and the production and operation integrated display subsystem displays production and operation integrated information of a company, concentratedly manages, integratedly displays and unifiedly regulates an SCADA system, a production scheduling system, a safety management and control system, vehicle positioning management and a 3D simulated training system, can call and display all information conveniently and flexibly, can be associated with a computer network system, a video monitoring system and other independent computer work stations, realizes integrated display for graph and video image information of computers, and satisfies different display requirements for monitoring, commanding and scheduling.

The invention provides a method and system for testing the methane electric blocking function. When testing the methane electric blocking function, it is first judged whether the methane sensor is in the calibration state; If the switch of the equipment controlled by the sensor is in the power-off state, an alarm will be issued to remind the relevant testers to stop the test, which ensures that the on-site testers can always conduct on-site tests when the switch of the equipment is powered on, and avoid potential safety hazards.