433results about How to "Safe and reliable operation" patented technology

The invention relates to a novel large torque piling machine power head hardened reducer. The reducer comprises an engine body, a cover body, a central gear, an output shaft and more than two groups of planetary transmission mechanisms, wherein two ends of the output shaft are respectively supported on the engine body and the cover body in a penetrating manner; the output shaft at one side of the engine body is in end connection with a grouting device system; the central gear is connected onto the output shaft in a penetrating manner and is arranged between the engine body and the cover body; the more than two groups of planetary transmission mechanisms are supported on the engine body by taking the output shaft as a symmetric center; the planetary transmission mechanism comprises an input motor, and first-stage and second-stage planetary transmission mechanisms; the input motor is connected to an inclined gear shaft which is arranged in the engine body and the cover body through the first-stage and second-stage planetary transmission mechanisms; and the inclined gear shaft is meshed with the central gear. By adopting the more than two groups of planetary transmission mechanisms, the running power of the reducer is shunted; the reducer can stably and safely run for a long time under the large torque in matched with the meshed inclined gear shaft and the output shaft through the combination supporting of a roller bearing and a plane bearing; and the reducer has the advantages of compact structure, stable running, shunted work load, little equipment abrasion, low noise and long service life.

The invention discloses an air conditioning system and a condensation preventing control method and device for a refrigerant radiating pipe of the air conditioning system. The condensation preventingcontrol method comprises the following steps that a current operation mode of the air conditioning system is obtained, and the temperature of the refrigerant radiating pipe and the dew point temperature of air around a frequency conversion module are obtained; the condensation extent of the refrigerant radiating pipe is obtained according to the temperature of the refrigerant radiating pipe and the dew point temperature of the air around the frequency conversion module; and the opening degree of an outdoor throttling element, the opening degree of an indoor throttling element, the air speed ofan outdoor fan and the operation frequency of a compressor are adjusted according to the current operation mode of the air conditioning system and the condensation extent of the refrigerant radiatingpipe so that condensation on the refrigerant radiating pipe can be removed. Through the method, the condensation on the refrigerant radiating pipe can be removed, the situation that condensed water enters an electric control mainboard, and consequently the electric control mainboard is burned out is prevented, and accordingly, the effect that the system operates safely and reliably can be ensured.

The invention discloses a start-up method for an ex-situ prevulcanization secondary activity center hydrogenation catalyst. After resistance to air loss of a device is qualified, circulating hydrogen compressor working load is adjusted to 0-20% of a maximum load, the catalyst reacts at a low temperature to release heat; when the bed layer temperature rise to 60-150 DEG C, start-up activation oil is introduced, the circulating hydrogen compressor working load is adjusted to 60-100% of the maximum load for wetting of the catalyst; the start-up activation oil is cycled in a reaction system closed path, the catalyst bed temperature is risen to 180 to 230 DEG C by heat exchange; a proper amount of olefin-enriched naphtha is added into the start-up activation oil, the catalyst bed temperature is risen to 300-380 DEG C to complete start-up activation. The start-up method, in the premise of no influence on the use properties of the secondary activity center hydrogenation catalyst, can better use the catalyst characteristics, reduce the device energy consumption, and reduce the device investment cost, and the start-up process can be simplified.

The invention belongs to the technical field of robots and particularly relates to an intelligent modular hollow joint. The intelligent modular hollow joint comprises a motor, a brake, an incremental encoder, a harmonic reducer, an absolute encoder, a torque sensor, a hollow wiring tube and a tail-end output shaft. The brake and the incremental encoder are arranged on a rear end cover of the motor and in transmission connection with the rear end of a motor output shaft through a transmission device, the front end of the motor output shaft is connected with the harmonic reducer which is connected with one end of the tail-end output shaft, the outer end of the tail-end output shaft is connected with the torque sensor, and the absolute encoder is mounted on the tail-end output shaft. The motor output shaft and the tail-end output shaft are both in hollow structures, the hollow wiring tube sequentially penetrates through the tail-end output shaft, the harmonic reducer and the motor output shaft, and one end of the hollow wiring tube is connected with the rear end cover of the motor while the other end of the hollow wiring tube is rotatably connected with the tail-end output shaft. The intelligent modular hollow joint in modular design is applicable to robot joints, and all parts of the intelligent modular hollow joint are replaceable to make it convenient for modification.

The invention discloses an island integrated energy supply and safeguard system. The system includes a small-sized nuclear power generation device which serves as a main power supply of an island micro-grid; a switch station which is intended for connecting the small-sized nuclear power generation device to the micro-grid; a high capacity energy storage system for energy storage and a super capacitor; a distributed regeneration power generation system which serves as an auxiliary power supply of the island micro-grid; a diesel power generation system which serves as an emergency energy source of the island micro-grid; and a micro-grid integrated control management center system; the mall-sized nuclear power generation device, the switch station, the high capacity energy storage system, the distributed regeneration power generation system, the diesel power generation system, and the micro-grid integrated control management center system are connected through power transmission lines or / and micro-grid communication lines. According to the invention, the system can provide integrated energy supply and safeguard.

The invention relates to a full-automatic compression band cleaning system and a cleaning process. The system comprises a spray previous cleaning unit, an ultrasonic cleaning unit and a spray rinsing unit, wherein the spray previous cleaning unit comprises a first cleaning solution storage tank and a first cleaning tank positioned below the first cleaning solution storage tank; the ultrasonic cleaning unit comprises a second cleaning solution storage tank and a second cleaning tank positioned below the second cleaning solution storage tank; the spray rinsing unit comprises a third cleaning solution storage tank and a third cleaning tank positioned below the third cleaning solution storage tank; and a transmission structure is arranged in the first cleaning tank, the second cleaning tank and the third cleaning tank, and the transmission structure is used for sequentially sending a work piece to be cleaned into the first cleaning tank, the second cleaning tank and the third cleaning tank for cleaning. The system disclosed by the invention adopts a passing type cleaning line, a special stainless steel net strip is adopted, the operation is safe and reliable and the service life is long; and ultrasonic waves adopt upper and lower radiation cleaning against the characteristics of a cleaning product so as to achieve a best cleaning effect.

The invention discloses a vertical ventilating shaft explosion door capable of automatically resetting after blast release and pressure relief, which belongs to the technical field of ventilating safety of coal mines and solves the problems that an explosion door fast depressurizes and releases blast air pressure and safely, automatically resets to close the mouth of a well and protects a ventilator device to be safely operated and normally ventilated when downhole blast impacts the mouth of a vertical ventilating shaft. A template pressure relief device and a skylight for a pilot pressure relief device capable of automatically resetting and closing are arranged on the top and a shell surface of the explosion door respectively; the explosion door is provided with four groups of hydraulic cylinders which synchronously move in two directions and are used for pulling and pushing the explosion door to automatically ascend and descend along the cylinders (tracks) and a hydraulic control and electric control system; the explosion door is also provided with a control device for operating a door body lifting hydraulic cylinder in a machine room and a pump station so as to realize natural ventilation and inverted ventilation operation; and a magnet steel sucking skylight is locked to realize inverted ventilation without manual operation. A composite technical system for operation and lifting control of the explosion door is safe and reliable, remote control operation is convenient and rapid, a ventilator is safely operated and ventilated during an accident, and an explosion-proof effect of the explosion door is achieved.

The invention provides a coal tar hydrogenation system and a coal tar hydrogenation method. The method comprises a hydrogenation refining reactor, a separation unit and a hydrogenation cracking reactor, wherein the hydrogenation refining reactor is an up-flow fixed bed reactor, the hydrogenation cracking reactor is a down-flow fixed bed reactor, and the separation unit is a middle liquid separation tank; gas-liquid separation is performed on raw oil and hydrogen after a hydrogenation refining reaction, a part of liquid-phase heavy fractions is separated, one path is used as circulating oil and returned to perform the hydrogenation refining reaction again, and the other path is used as quenching oil after being cooled and added between catalyst bed layers for the hydrogenation refining reaction to play a role of cooling; and the other part of the liquid-phase heavy fractions is used as refined generated oil and mixed with hydrogen to perform a hydrogenation cracking reaction, and the obtained reaction product is combined with gas-phase light fractions after the gas-liquid separation to form the final product. The system and the method provided by the invention are low in equipment cost, simple to operate, capable of prolonging the life of the catalysts of the hydrogenation refining reactor and the hydrogenation cracking reactor, and suitable for raw oil with worse conditions.

A jogging machine having a platform folding structure includes a base, a platform, a lifter, a pedal, a cable and a block. The lifter includes a cylinder having an engaging end for engagement with the block to maintain the platform in an upright position firmly. By operating the pedal, the cable will pull the block outward so that the platform is released and lowers down slowly.

The invention relates to a numerical simulation method for the temperature and thickness relation of a static thrust bearing gap oil film based on film thickness variation, and belongs to the technical field of fluid mechanics simulation, which aims at solving the problems that as the thickness variation of the oil film is not taken into account in the traditional static thrust bearing internal fluid numerical simulation method, the temperature number simulation result of the oil film is lower the actual number. The method comprises the following steps of: establishing a static thrust bearing gap oil film female model and carrying out pretreatment; simulating the flow-state numerical value of the oil film; guiding the averaged temperature of the rotary wall surface of the oil film and the temperature of an appointed fixed wall surface of the oil film after simulating the numerical value; calculating the new thickness value of the oil film by utilizing the relation of the temperature of the oil film and the temperature of lubricating oil; judging whether the new thickness value of the oil film, obtained in the step, is less than the critical temperature of the oil film or not; returning the thickness of the oil film as the thickness initial value of the oil film and then continuously executing subsequent steps; repeatedly calculating until the thickness of the oil film reaches the critical value of the oil film; and obtaining a final pressure field distribution cloud picture and a final temperature field distribution cloud picture of the oil film. The method is suitable for numerical value simulation of a static thrust bearing gap oil film.

The invention discloses a refrigerating system with a Knudsen compressor as the core. The refrigerating system is composed of the Knudsen compressor (1), a high-temperature heat source (2), a condenser (3), a storage device (4), a throttling valve (5), an evaporator (6) and a dryer (7). The refrigerating system has the advantages that movement parts do not exist, lubricating oil is not needed, operation is safe and reliable, noise is avoided, pollution of the compressor to refrigerants is prevented, and the service life of the refrigerating system can be effectively prolonged; the refrigerating system is directly driven by heat energy, waste heat on some devices can be recycled, and the energy use ratio is improved; the environment-friendly novel energy, namely the solar energy, is directly used in the refrigerating system.

Tube furnaces for pyrolyzing or sintering are large in axial heat radiation, nonuniform in hearth temperature and low in machining amount. The invention discloses an environment-friendly automatic-temperature-control quartz tube furnace device for pyrolysis of high polymer, wherein the environment-friendly automatic-temperature-control quartz tube furnace device comprises a quartz glass tube furnace, a sample stand, a heat-isolation ventilation assembly, a fireproof heat-insulation furnace body, an automatic-heating temperature control device, a safety protection device and a tail gas treatment device. Different from other tube furnaces, the quartz tube furnace device is characterized in that a furnace body structure is improved by taking heat insulation measures additionally for inner and outer ports of a hearth, the axial-radial ratio of the tube furnace is high up to 12.5, resistance wires are arranged in a nonuniform winding manner and are arranged densely at the ports and sparsely in the middle, in addition, a safety protection bag and a tail gas purification column are arranged, and the furnace is internally vacuumized and is introduced with nitrogen. The environment-friendly automatic-temperature-control quartz tube furnace device disclosed by the invention is simple in equipment, low in investment, good in gas tightness, high in vacuum degree, convenient for heating as well as temperature measuring and controlling, and good in heat insulation effect, and is safe, energy-saving and environment-friendly, and an intra-furnace pyrolysis region is long and uniform in temperature, so that pyrolysis and doping reaction effects are good, and the processing amount is large. The environment-friendly automatic-temperature-control quartz tube furnace device can also be applied to other high-temperature reaction processes.

The invention discloses a large wind turbine generator system with double wind wheels, belongs to the field of generators, and aims at solving the problems of low unit capacity, high generator system investment, low generating capacity and the like of the existing wind turbine generator system with a single wind wheel. The large wind turbine generator system with the double wind wheels comprises a tower barrel, a cabin seat, the wind wheels, blades, transmission devices and a generator, wherein two groups of wind wheels, blades, transmission devices are provided respectively, and symmetrically arranged at the two sides of the generator respectively, and the first-group transmission device comprises a first main shaft, a first coupling, a first low gear shaft, a first gearbox, a first high-speed shaft and a first elastic coupling which are sequentially connected; and the second-group transmission device comprises a second main shaft, a second coupling, a second low gear shaft, a second gearbox, a second high-speed shaft and a second elastic coupling which are sequentially connected, and the first elastic coupling and the second elastic coupling are connected with double output shafts at the two ends of the generator respectively. The wind turbine generator system with the double wind wheels, which is disclosed by the invention, is safe and reliable in running, and easy to manufacture, install and maintain.

The invention provides a biochemically treating and discharging refinery wastewater within controlling index of national standard. The method comprises oil removal, floatation and biochemical treatment, wherein the biochemical treatment is performed in sequence through an anaerobic flow bed biofilm reactor, an anoxic basin and an aerobic flow bed biofilm reactor; and a part or all of mixed liquidflowing out of the aerobic flow bed biofilm reflows into the anaerobic flow bed biofilm reactor. According to the method, refinery wastewater is treated by adopting an 'aerobic flow bed biofilm reactor-anoxic method-aerobic flow bed biofilm reactor' process which has high impact resistance and is safe during running. High instantaneous impact resistance is achieved, and the treatment effect is hardly influenced. The entire biochemical system has high salt resistance, and the treatment effect is hardly influenced by the change of temperature. The refinery wastewater does not need to be subjected to subsequent further oxidation after being treated with the process, the effluent COD (Chemical Oxygen Demand) meets the national primary discharge standard less than or equal to 60 mg / l, and investment cost and running cost are saved. The entire system has a compact structure, so that the floor space is reduced.

The invention relates to an efficient and energy-saving device for a hydraulic station. The device comprises a control cabinet, a hydrocylinder, a hydraulic control valve, an oil pump with a motor, a pressure gauge with an electric contact, an electromagnetic relief valve, an accumulator, a check valve and an intelligent control valve, wherein the intelligent control valve is arranged between theinlet of the oil pump and a hydraulic oil tank and connected with the hydraulic control valve through the accumulator; an oil return tubule which is communicated with the hydraulic oil tank is arranged on the oil pump; the check valve and the pressure gauge with the electric contact are arranged between the oil pump and the hydraulic control valve in turn; a pipeline between the check valve and the pressure gauge with the electric contact is communicated with the oil tank through the electromagnetic relief valve; and the intelligent control valve, the pressure gauge with the electric contact and the electromagnetic relief valve are all connected with the control cabinet. The device has the advantages that: the structure is simple; cooling equipment does not need to be added; the using cost is low; the control cabinet is matched with the intelligent control valve, so that the hydrocylinder is automatically boosted, and high-speed oil return is avoided and the oil pump can run in an unpowered mode continuously; the whole energy consumption is low; and the equipment runs safely, has a long service life and is environmental-friendly.

A jogging machine having a platform folding structure includes a base, a platform, a lifter, a pedal, a cable and a block. The lifter includes a cylinder having an engaging end for engagement with the block to maintain the platform in an upright position firmly. By operating the pedal, the cable will pull the block outward so that the platform is released and lowers down slowly.

The invention relates to a wave-powered generating device belonging to the field of hydraulic machinery or hydraulic generators, and aims to provide a device for continuously generating electricity by utilizing waves. The wave-powered generating device comprises a shell which is anchored on seabed; floating ball generating systems are arranged in the shell and mounted on a rotating shaft; the system comprises a spring, a ligament, a ratchet wheel mechanism and a transmission wheel, wherein the ratchet wheel mechanism comprises a small flywheel and a ratchet wheel; the small flywheel and the transmission wheel are fixedly mounted on the rotating shaft; the transmission wheel drives a gear in a gearbox to rotate; the ratchet wheel is in a box shape; the small flywheel is arranged in the ratchet wheel; a pawl is arranged on the inner circumferential surface of the ratchet wheel; the outer circumferential surface is wound by the ligament, one end of which is fixed on the ratchet wheel; and the other end is connected with the floating ball which is arranged on the exterior of the shell; the sealing side of the ratchet wheel is connected with the spring which is wound on the rotating shaft; the other end of the spring is fixed; and the shell is internally provided with at least two floating ball generating systems. The invention has simple structure, convenient use, strong wave resistance, low manufacture and construction costs and long-term use without manual maintenance.

The invention relates to a sewage treatment method in synthetic rubber production and belongs to the technical field of industrial sewage treatment. The method comprises steps in the following order: sewage pretreatment, sludge adsorption, hydrolytic acidification, aerobic biochemical treatment and advanced oxidation treatment, inclusive of domestic sewage and synthetic rubber production sewage blended treatment. By the adoption of the method, biodegradation rate and degradation effect are effectively raised. Iron-carbon microelectrolysis technology is adopted in the advanced oxidation stage, thus greatly reducing treatment cost and effectively removing pollutants of COD, NH3-N the like in the synthetic rubber production sewage. COD of an effluent obtained after the treatment is less than or equal to 60mg / L, and NH3-N is less than or equal to 5mg / L. therefore, the method achieves the standard of discharge and is of great realistic significance. In addition, the treatment cost of the sewage per ton can be reduced to 0.5 yuan. The economic benefit is great.

A suckback prevention device for single use high-speed turbine dental drill handpiece, installed at the side assembled with the drilling needle of the head housing of the high-speed turbine dental drill handpiece which comprises a head, a drilling needle (3), a front handle (1), and a back handle (2). A powered wind wheel (7) and a wind wheel axle (15) driving the rotation of the drilling needle (3) are installed in the clearance space between the head housing (4) and the head cover (8). The wind wheel axle (15) is supported by the bearing (6). An O-shaped vibration reduction ring is disposed between the bearing (6) and the head housing (4). The upper end of the wind wheel axle (15) is connected orderly to the button cap spring (10) and the button cap (9). A water passage (19), an air passage (20), and a driving wind wheel air passage (12) are set at the neck portion of the head. The compressed air inlet (11) of the driving wind wheel is located in the powered wind wheel (7). The lower end of the wind wheel axle (15) is hidden inside of the head housing (4) and is connected with the drilling needle (3). The edge of the head housing (4) relative to the wind wheel axle (15) and the drilling needle (3) is an annular opening in a two-step profile shape. An elastic bowl-shaped axle shroud (14) is buckled in the inner step of the head housing (4). An eyelet for the drilling needle is set at the center of the axle shroud (14), and the size of the eyelet is slightly larger than the outer diameter of the drilling needle. An annular screw (13) is screwed connected to the outer step of the head housing (4).

The invention relates to a combined type jet flow fish pump with an automatic control system. The combined type jet flow fish pump comprises a diaphragm-type pressure difference switch, two guide pipes which are communicated with each other are respectively arranged at the two ends of a diaphragm, one ends of the guide pipes are communicated to the walls of a front fish suction pipe a large end of a drainage taper pipe, and the other ends of the guide pipes are communicated to the walls of a front jet device suction port on a small end of the drainage taper pipe; and an upper end of a bidirectional valve rod is provided with an electric rod which is connected with the diaphragm-type pressure difference switch, the diaphragm-type pressure difference switch controls to drive the electric rod according to the pressure difference which is generated by the two sides of the diaphragm, when the pressure difference is increased, the electric rod drives the bidirectional valve rod to move downwards to close an upper valve opening and open a lower valve opening, so that the pressure difference is reset to normal, the electric rod is reset, the electric rod drives the bidirectional valve rod to move upwards to open the upper valve opening and close the lower opening. The combined type jet flow fish pump is convenient to operate, the drainage taper pipe can be prevented from being blocked due to over high fish water density, the blockage problem of the drainage taper pipe can be automatically solved, and the combined type jet flow fish pump is enabled to reliably operate.

The invention discloses a solar thermal power high-temperature long shaft molten salt pump. The solar thermal power high-temperature long shaft molten salt pump comprises a pump shaft, a hydraulic part, a supporting vibration reduction structure, a fluid seal structure and a bearing cooling device are sequentially arranged on the pump shaft from bottom to top, a suction segment is arranged at the front end of the hydraulic part, a blade grid type filter is arranged on the front end of the suction segment, a tail stage flow guide shell is arranged at the tail end of the hydraulic part, the tail end of the tail stage flow guide shell and the front end of a supporting pipe of the supporting vibration reduction structure are fixedly connected, and the tail end of the supporting pipe of the supporting vibration reduction structure is fixedly connected with the bottom of the outlet segment of the fluid seal structure through a flange plate. The solar thermal power high-temperature long shaft molten salt pump is designed to be in the center flow-out manner, thermal expansion uniformity under the high-temperature state can be ensured, through solution schemes of reliable fluid seal design, reasonable cooling structures, flange type expansion joint vibration reduction configuration and the like, safe, reliable and efficient running of the solar thermal power high-temperature long shaft molten salt pump is ensured, and meanwhile, various property indexes are met.

The invention discloses a triaxial rotation mechanism control apparatus with a real-time fault monitoring capability. A triaxial rotation mechanism is under the control of three orthogonally installed DC brushless motors. The apparatus mainly comprises a master control unit taking a DSP as a core, a signal acquisition module taking a CPLD as a core, and an optical coupler isolation module. The DSP receives external motor rotation instructions and synchronization signals and is connected with the signal acquisition module, a bus transmission module, a level conversion module and a communication module. The signal acquisition module is used for acquiring a rotation mechanism angle measuring apparatus signal, a temperature sensor signal, a vibration sensor signal, and a fault detection signal of a motor driving module and sends the acquired signals to the DSP. The DSP, according to the four received signals, determines whether the apparatus is currently at a normal working state so as to realize real-time monitoring of the control apparatus. In terms of a control algorithm, by use of an active control strategy, smooth transition of uniform-speed forwarding and reversing of the rotation mechanism are guaranteed, and the control precision of a system is ensured.

A transmission device with a steplessly adjustable branch transmission mechanism has two parallel transmission paths, wherein the steplessly adjustable branch transmission mechanism is arranged in the first transmission path of the two transmission paths .

A folding, self-erecting ladder for use in the marine environment comprises two rigid side rails with holes for holding rungs. Bungee cord is thread through the rungs and rails to tension the rails toward each other top hold the rungs in the rail holes. The ladder can be folded by pulling the rails apart, allowing the rungs to leave the rail holes, and moving the rails closer to each other, trapping the rungs therebetween, and binding the folded ladder to hold it in the folded position.

The invention relates to a power tool and battery pack assembly including a battery pack (18) for connection with the power tool (1) to provide power for the operation of the power tool (1) when connected thereto. The battery pack (18) includes a plurality of power cells and connection means (40, 42) are provided to allow the selective supply of power at least a first or second voltage level to the power tool (1) from the battery pack (18).

The invention discloses an insulator metamorphic detection robot mechanism. The mechanism comprises mobile units and a detection element, and least two mobile units are adopted and mutually connected into a whole to form a mobile mechanism surrounding an insulator chain. Each mobile unit comprises a hook surface frame with the hollowed-out middle, a cam mechanism is arranged on one side of the hook surface frame, a parallelogram mechanism is arranged on the cam mechanism, a driving device is mounted on the parallelogram mechanism, clamping jaws are arranged on the parallelogram mechanism, and a crawler belt type guide mechanism is arranged on the hook surface frame in the radial direction of insulators. Disassembling and assembling can be conducted, operators can carry and mount the mechanism conveniently, operation is relatively safe and reliable, and the crawler belt type guide mechanisms achieving the guiding function make flexible contact with the insulator chain, so that abrasion of the surfaces of the insulators in the guiding process is avoided; and the mechanism can well adopt to errors of the insulators, the mechanism is reasonable in structure design, stable in operation, capable of detecting horizontal, overhung and oblique insulator chains and wide in application range.

The invention provides a hydrodynamic pressure suspension double-flow pump, relating to an impeller ultra-small pump which has no external mechanism axis and is driven magnetically. The pump comprises two mutually separate flowing channels; each flowing channel consists of an inlet, an impeller, a pressure water chamber and an outlet; and the geometrical parameters of the flowing channels are the same or different; a stator of the pump is embedded in a pump shell, a permanent magnet is embedded in a rotor; and the stator and the permanent magnet are arranged opposite along a radial direction; a radial gap is formed between the internal surface of the pump shell and the external surface of the rotor, so that liquid hydrodynamic support for restricting axial movement is formed during normal operation of the pump; an axial gap is formed between the front cover plate of each impeller and the corresponding pump cover, so that liquid hydrodynamic support for restricting rotor axial movement is formed during the normal operation of the pump. In such a way, the rotor can be suspended in the pump cavity during normal operation. The pump provided by the invention can be used for meeting double-flow use requirement of different flows and pressures, and good flowing condition can be effectively and favorably formed in the internal cavity of the pump shell, and moreover, the operation reliability of the pump can be improved.

A technique is proposed for performing add / drop operations in an OADM assembly serving an optical network and comprising an add unit and a drop unit. With respect to at least one optical channel assigned to an optical wavelength λ, the OADM assembly is capable of dropping the channel from the network via the drop unit as a first signal, and adding the channel to the network via the add unit as a second signal. According to the technique, the OADM assembly additionally comprises an authentication and control unit ACU for authenticating the at least one optical channel and controlling the OADM assembly. The ACU is authenticates the optical channel by comparing one or more components of the first signal with one or more components of the second signal serving as a reference, and based on the authentication result, makes decisions whether to allow or block the dropping and / or adding of the optical channel.