72results about How to "Avoid operational hazards" patented technology

The invention provides an autonomous flight pesticide spraying unmanned aerial vehicle controlled precisely and a plant protection method using the autonomous flight pesticide spraying unmanned aerialvehicle controlled precisely. The autonomous flight pesticide spraying unmanned aerial vehicle comprises a fuselage, four or more rotor wings, an undercarriage, a mounting plate, an externally-hung pesticide box, a control device and a power source. The control device of the unmanned aerial vehicle collects environment data in real time, and comprehensive dynamic adjustment is conducted accordingto the environment data, specifically, the expansion amount of expansion joints is adjusted according to the deviation angle, a wind speed empirical value is added on the basis of the expansion amount, and thus spraying precision is improved; and PWM is adjusted according to the wind speed, the spraying amount is increased, and the unmanned aerial vehicle plans a path automatically and makes a return flight automatically under the situation that the wind speed is too large. According to the autonomous flight pesticide spraying unmanned aerial vehicle controlled precisely, the spraying precision can be effectively improved, and the using safety of the unmanned aerial vehicle is improved.

The invention provides a defrosting method of a variable-frequency air source heat pump unit. The defrosting method comprises the following steps that when a defrosting condition is reached, a compressor is reduced to the lowest frequency and kept for 5 seconds, a defrosting mode is started, the frequency of the compressor is increased to the defrosting frequency, the expansion opening degree is adjusted to the defrosting opening degree, then the defrosting frequency is reduced by 5Hz every 30 seconds, the defrosting opening degree is reduced by 4%, and the adjustment is stopped until the frequency is reduced to the defrosting lower limit frequency; and the air exchange temperature, the unit high-pressure value and the defrosting duration are monitored, when any one of the three parametersexceeds a set value, the unit exits the defrosting mode, the frequency of the compressor is reduced to the lowest frequency and kept for 5 seconds, a fan is started and waits for 5 seconds, and the unit is switched back to normal heating. The method can reduce the defrosting switching impact of the air source heat pump, improves the unit safety, and reduces the noise. Meanwhile, the real-time matching of the defrosting heat demand and the unit heat supply can be kept, the total defrosting time is shortened, and the defrosting energy consumption is reduced.

The invention discloses a preparation method of an asymmetric aromatic azo compound. The preparation method comprises the following steps: performing condensation on aromatic hydrazine and aryl halide which are used as raw materials in a dichloromethane two-phase system of a solid base catalyst to obtain asymmetric disubstituted hydrazine, and performing catalytic oxidation on the asymmetric disubstituted hydrazine to prepare the asymmetric aromatic azo compound. The asymmetric aromatic azo compound prepared by the preparation method has the yield of above 85% and the purity of 98% and above; compared with the prior art, the preparation method is safe, simple and convenient to operate, greatly improves an operating environment, and avoids of a dangerous diazotization step; moreover, the method is mild in reaction condition, good in selectivity, easy in process control and stable in product quality, can recycle and reuse unreacted organic raw materials, and greatly reduces the treatment intensity of environment-friendly COD, thereby being suitable for industrial production.

The invention relates to a method for achieving classified recovery of metals in circuit boards, in particular to a method for recycling copper, tin, nickel, palladium, gold, silver and resin in the circuit boards. The method comprises the technological processes such as smashing, acid leaching, anode rotating forced-striking electrolysis and floatation. The method comprises the steps that the circuit boards are smashed into tiny fragments firstly; then the tiny fragments are subjected to acid leaching to enable reactive metal tin or nickel to be dissolved out; insoluble substances are placedin an anode rotating forced-striking electrolysis bath to be electrolyzed for recycling copper; anodic filter residues are obtained after filtering is conducted and transferred into water or heavy oilfor floatation, by means of density differences of the metals, resins and solvents, noble metals settles, the resins float on the surface and is separated, and resin powder is recycled on the upper layer; and finally, the noble metals are smelted and further separated. According to the method, various metals and resins can be separated and recycled form the waste circuit boards, and an environment-friendly process for recycling all resources in the circuit boards is achieved.

The invention belongs to the technical field of medical chemistry, and particularly relates to a novel intermediate compound of silodosin, a crystal form of the novel intermediate compound, a method for preparing the same and a novel method for preparing the silodosin by the aid of intermediates. The novel intermediate compound, the crystal form and the methods have the advantages that compounds IV are prepared and transformed into compounds III in hydrochloride forms, accordingly, dehydrogenation impurities can be effectively removed and reduced, and the quality of products can be improved; the methods are easy to implement and high in reaction yield and are safe and controllable, reaction conditions are mild, the products are high in purity, and the novel intermediate compound and the methods are applicable to industrial production.

The invention belongs to the field of pulp making, and particularly relates to a method for making pulp by using plant fiber as the raw material. The method includes the process steps of cleaning, filament rolling, hydrolysis reaction, pressing, grinding and pulping. By adopting a protease aqueous solution to carry out hydrolysis reaction on the plant fiber to hydrolyze the lignin structure, the integrity of the linear macromolecules of the plant fiber can be guranateed to the greatest extent, and the quality of the product is guranateed; meanwhile, the protease aqueous solution can be recycled. According to the method, high temperature and high pressure are not required in the whole pulp production process, and thus the danger of operation is avoided; the whole process can achieve zero discharge of sewage, has no pollution to the environment, and promotes energy conservation and environment protection.

The invention discloses a method and system for generating measurement point alarm and reset information in a background of a distributed control system. The method comprises the steps of: deploying a real-time database, and building a measurement point information table; judging a real-time value in an analog quantity measurement point information table in the real-time database of an upper computer and an alarm out-of-limit threshold value of a measurement point to obtain an analog quantity measurement point line-crossing state result; comparing the line crossing state result of the measuring point with an alarm state stored in a library; according to real-time values and alarm modes in a switching quantity measuring point information table in the real-time database of the upper computer, judging the measuring point alarm state of a switching quantity; comparing the judged alarm state result of the measuring point with an alarm state stored in the library; and ending the background alarm generation process, and continuing the next round of background alarm detection after a fixed period time. According to the method, monitoring hidden dangers caused by loss of alarm and reset messages can be prevented; the situation that messages may be lost due to communication between the upper computer and a lower computer is avoided, and the operation safety of the control system is improved.

The present invention provides a spotlight positioning automatic following system. The system comprises a spotlight, an image generation device, a client control module and a gateway controller. The spotlight is provided with a spotlight control module which is in wireless communication connection with the gateway controller, the spotlight control module controls the beam of the spotlight to follow a specific irradiation pattern or irradiation point irradiated by the image generation device to move, and the spotlight can regulates the irradiation angle and position according to a operator's demand. The operator also can regulate the color temperature and brightness of the light on the client control module so as to reach a perfect object display effect while attracting eyeballs.

The invention discloses a device for hanging cable hooks. The device comprises a jaw part, a rod part and a handle part which are sequentially connected, the jaw part comprises a fixed jaw and a flexible jaw, the rod part comprises a telescopic rod and a pull rod, and the handle part comprises a fixed handle and a flexible handle. The fixed jaw is fixed at the upper end of the telescopic rod, a protrusion is arranged in the middle of the fixed jaw, the flexible jaw is hinged to the fixed jaw, the flexible jaw is hinged to the pull rod in the telescopic rod, the fixed handle is fixed at the lower end of the telescopic rod, the head of the flexible handle is hinged to the fixed handle, and a locking part is arranged on the flexible handle. According to the device for hanging the cable hooks, the cable hooks can be fixed at the upper end of the rod part, and the cable hooks with different sizes can be hanged on a steel strand; the cable hooks can be taken down only by loosening the fixed handle and the flexible handle; the length of the telescopic rod is adjustable, and the device is suitable for cable steel strands with different heights and convenient to carry; the size of the jaw is adjustable, and installation requirements of the cable hooks with different sizes can be met.

The invention provides a section-bar cutting device which comprises a fixing base, an angle adjusting mechanism and a section-bar fixing device. The angle adjusting mechanism is arranged on the fixing base and can rotate by an angle on the fixing base and be fixed. The section-bar fixing device is arranged on the angle adjusting mechanism and fixedly connected with the angle adjusting mechanism. A section bar can be obliquely fixed through the section-bar fixing device relative to the angle adjusting mechanism.

The invention discloses an insulation sleeve. The insulation sleeve comprises a terminal, an upper flange, an upper sealing plate, an insulating tube, a conducting rod, a lower flange, a lower sealingplate and a shielding electrode. The conducting rod is coaxially installed in the insulating tube and passes through the shielding electrode. One end of the conducting rod is fixedly connected to theupper sealing plate. The upper sealing plate is fixedly arranged on one end of the insulating tube through connection with the upper flange. The lower sealing plate is provided with the shielding electrode. The lower sealing plate is fixedly arranged at the other end of the insulating tube through connection with the lower flange. A protection cover is wrapped on at least one of a peripheral surface of the upper flange and a peripheral surface of the lower flange, wherein the peripheral surface of the upper flange is connected to the upper sealing plate, and the peripheral surface of the lower flange is connected to the lower sealing plate. The invention also discloses the protection cover used for insulating sleeve repairing and a repairing method of the insulating sleeve. Through wrapping the protection cover in advance, water vapor is kept out of the protection cover, a sealing environment in the insulation sleeve is ensured, an insulation sleeve electrode breakdown phenomenon is avoided, reliability of high pressure equipment operation is increased, and a service life of the insulation sleeve is prolonged.

The invention discloses an auxiliary feeding device of a forging hydraulic press. The device comprises a base, a support rod, a fixing frame, a moving mechanism, a clamp mechanism and a control box, wherein the support rod is arranged at the central position of the rear side of the top end of the base in the up-and-down direction, the fixing frame is detachably and fixedly arranged at the top endof the support rod through a screw, the moving mechanism is arranged at the front side of the bottom end of the fixing frame, the clamp mechanism is arranged at the bottom end of the moving mechanism,and the control box is arranged at the right rear portion of the top end of the base in the up-and-down direction. According to the auxiliary feeding device of the forging hydraulic press, automaticfeeding of a metal blank can be realized, and several workers do not need to manually cooperate and use tools for feeding, so that manpower waste is avoided, useless operation items are reduced, and operation danger caused by the high temperature of the metal blank is avoided.

A grinding wheel clamp capable of being used on a lathe belongs to the technical field of machining equipment, comprises a chunk, clamping jaws and a grinding wheel and further comprises a stepped shaft, a grinding wheel blocking sheet and a clamp nut, wherein an external thread is arranged on the periphery of the small end of the stepped shaft; a central hole is formed in the center of the head part of the small end of the stepped shaft; the grinding wheel is mounted with one surface against a shaft shoulder of the stepped shaft; the grinding wheel blocking sheet abuts against the other surface of the grinding wheel; and the clamp nut is tightened on one side of the grinding wheel blocking sheet through the external thread. The grinding wheel clamp is simple in structure; the grinding wheel clamp with the grinding wheel can be placed on the lathe to be used; the grinding wheel clamp is clamped in the chunk and propped against a centre, so that as the chunk of the lathe rotates, the grinding wheel clamp can be driven to rotate to realize grinding of a cutter on the lathe; and the grinding wheel clamp is simple and convenient to mount and dismount, can avoid operation danger caused by gathering of people during a practical training process, and improves the efficiency of practical skill training.

The invention discloses a discharger with an automatic opening and closing function, and relates to the technical field of manufacturing of discharging equipment. The following scheme is provided forsolving the problems that a traditional discharger cannot achieve automatic opening and closing and cannot rapidly adsorb dust to the exterior of the equipment, the discharger comprises a bottom plate, a discharging box is fixedly connected to the top of the bottom plate, an automatic opening and closing device is connected to the interior of the discharging box, a fixing plate is fixedly connected to the top of the discharging box, a supporting block is fixedly connected to the top of the bottom plate, a driving motor is fixedly connected to the top of the supporting block, a first rotating shaft is fixedly connected to an output shaft of the driving motor, and the exterior of the first rotating shaft is connected with a transmission system. According to the discharger with the automaticopening and closing function, opening and closing can be automatically achieved at a feeding port, the operation risk is reduced, meanwhile, the dust can be rapidly adsorbed to the exterior of the discharging box through a dust suction fan, the workload of cleaning the interior of the discharging box is reduced, and the service life of the discharger is prolonged.

The invention discloses an intelligent full-automatic bearing press-fitting machine which is integrally composed of a bearing feeding line, a press-fitting sleeve, a bearing feeding mechanical arm, abearing press-fitting machine main frame, a press-fitting main oil cylinder, a wheel set lifting mechanism and a bearing rotation detection mechanism. According to the intelligent full-automatic bearing press-fitting machine, the process of replacing a press-fitting guide sleeve and a press-fitting head in the press-fitting process of different types of wheel set bearings is omitted, and automaticfeeding and automatic press-fitting of the bearings are achieved; and meanwhile, automatic rotation detection of the bearings is achieved in the bearing press-fitting process, the labor intensity ofoperators is relieved, and the working efficiency of bearing press-fitting is greatly improved.

The invention discloses a feeding and discharging machine for a cross cut shear line. The machine comprises a displacement device and a rotary feeding and discharging device which are fixedly installed on a bottom plate, the displacement device comprises a base and a displacement transmission structure arranged in the base, and the rotary feeding and discharging device is fixedly arranged on the displacement transmission structure. The rotary feeding and discharging device comprises a rotary jacking structure fixedly installed on the displacement transmission structure, a pallet fork structureon the rotary jacking structure is fixedly installed on the rotary jacking structure, the displacement transmission structure comprises sliding rails symmetrically arranged on the base, and racks parallel to the sliding rails are arranged on the inner wall of the base. A displacement plate is fixedly installed on the sliding block on each sliding rail, a displacement driver is arranged on each displacement plate, a displacement driving gear is fixedly arranged on an output shaft of each displacement driver, and each displacement driving gear is meshed with the corresponding rack. By means ofthe manner, automatic feeding, discharging and heavy loading can be achieved, the positioning precision is high, transportation is stable, product transfer transportation is smooth, and the transportation efficiency is greatly improved.