33results about How to "Eliminate major security risks" patented technology

The invention relates to an ABS brake control circuit of an elevator brake system, which comprises a brake controller, a back-up source, an artificial rescue command circuit, a power grid power down command circuit, a system fault command circuit, a signal identification circuit, a brake mode switching circuit and the like. By adopting the ABS brake control circuit, when carrying equipment, such as an elevator and an escalator, has system fault, an electric grid is power-down or emergency rescue is required, the carrying equipment can be converted to safety stopping from antecedent safety speed reduction, the major hidden danger in the elevator brake system caused by once complete braking of the elevator brake system is canceled, the ABS brake control circuit can also ensure that the phenomena that an elevator car is out of speed and a brake is out of control can not occur when manual brake release is adopted, and the brake safety of the carrying equipment, such as an elevator, an escalator and an passenger conveyor, is improved.

The invention relates to a device for eliminating rail gnawing of a trolley of a large-size bridge crane. An additional disc spring supporting arm is arranged at the bottom of an existing trolley of the bridge crane. The device comprises a main body frame, the disc spring supporting arms, rolling balls and disc springs; a disc spring shell is installed on the periphery of each disc spring; the main body frame is fixedly connected with a crane trolley bottom connector; the two ends of the crane trolley bottom connector are provided with trolley wheels; the trolley wheels are arranged on trolley rails which are arranged on girders of the bridge crane; the two disc spring supporting arms are fixedly arranged on the two horizontal sides of the lower end of the main body frame; each rolling ball is installed at the end of the corresponding disc spring supporting arm; and a circular-groove-shaped guide rail is arranged between each rolling ball and the corresponding girder of the bridge crane. The device for eliminating rail gnawing of the trolley of the large-size bridge crane has the beneficial effects that the structure is simple, and operation is stable; and fraction and rail gnawing between the trolley wheels and the guide rails is eliminated, meanwhile, serious potential safety hazards cased by rail gnawing of the trolley is eliminated, and the safety of operation of the device and the personnel security are effectively ensured.

The invention provides a low-density ammonium nitrate fuel oil explosive, and a preparation method and application of the low-density ammonium nitrate fuel oil explosive. The low-density ammonium nitrate fuel oil explosive is prepared from the following raw materials in parts by weight: 86 to 90.7 parts of porous granulated ammonium nitrate, 4 to 9 parts of perlite particles and 5.0 to 5.3 parts of diesel oil. The preparation method comprises the following steps: (1) preparing the porous granulated ammonium nitrate, the perlite particles and the diesel oil in parts by weight; (2) uniformly mixing the porous granulated ammonium nitrate, the perlite particles and the diesel oil, thus obtaining the low-density ammonium nitrate fuel oil explosive. The application is characterized by applying the low-density ammonium nitrate fuel oil explosive in open-pit coal step loose blasting. The low-density ammonium nitrate fuel oil explosive provided by the invention is low in cost, small in blasting unit consumption, good in blasting effect and beneficial for increasing the block coal rate and increasing the economic benefit. The preparation method provided by the invention is simple and easy to operate and is also matched with conditions of an open-pit coal mine. According to the application of the low-density ammonium nitrate fuel oil explosive in the open-pit coal step loose blasting, disclosed by the invention, secondary charging is avoided, the probability that blast holes and blasting devices are crushed by an explosive truck is reduced, the blasting quality is favorably increased, and major hidden dangers are removed.

The invention discloses a safety valve installed in an intelligent gas meter and integrated with a brushless gear motor in a fastened mode. The valve is driven by the brushless gear motor free from electric sparks, and the brushless gear motor free from the electric sparks is tightly sealed. The valve is installed at the air inlet end or the air outlet end of a ventilation path in the gas meter. An original control method, original use conditions and an original drive circuit are not changed basically, an original installation position is not changed either, and possible potential safety hazards caused by brush sparks of the motor are eliminated under the condition that an original opening / closing control function is guaranteed.

The invention relates to a current leakage protection plug, which comprises a shell. The shell is provided with a reset button and a testing button, a circuit board is arranged in the shell, the circuit board is provided with a live wire stationary contact and a zero wire stationary contact, the live wire stationary contact and the zero wire stationary contact are electrically connected with a live wire pin and a zero wire pin on the shell through wires, the shell is provided with a ground wire pin, the ground wire pin is provided with a ground wire stationary contact, the ground wire stationary contact is provided with a ground wire stationary contact, a live wire spring plate, a zero wire spring plate and a ground wire spring plate are arranged in the shell and are connected with an output power cord, the live wire spring plate, the zero wire spring plate and the ground wire spring plate are correspondingly provided with a live wire dynamic contact, a zero wire dynamic contact and a ground wire dynamic contact which are contacted with the live wire stationary contact, the zero wire stationary contact and the ground wire stationary contact, a tripping device is also arranged in the shell, and the ground wire spring plate is provided with an elastic ejection component which can eject the live wire dynamic spring plate, the zero wire dynamic spring plate and the ground wire dynamic spring plate to be away from the stationary contacts in testing or current leakage. The invention aims to provide a current leakage protection plug with high safety and simple and reliable structure.

The invention discloses a saw chain guide plate double-sided continuous polishing production equipment, which includes an automatic feeder, an A-side polishing machine, an automatic turning machine, a B-side polisher, and a cleaning machine. The automatic feeder transports the saw chain guide plate to the A-side Polishing machine, the A side polishing machine grinds the A side of the saw chain guide plate, the automatic turning machine turns over the saw chain guide plate and then transports it to the B side polishing machine, and the B side polishing machine grinds the B side of the saw chain guide plate Grinding is carried out, and the cleaning machine cleans the polished saw chain guide plate, and the surface A polishing machine and the surface B polishing machine adopt water grinding polishing. The invention can realize automatic material feeding and automatic flipping, so that the saw chain guide plate can complete continuous surface A polishing, surface B polishing and water washing, and the efficiency is improved.

The invention provides a marble heat preservation and decoration integrated plate and a wall body structure. According to the scheme, the integrated plate comprises a heat preservation plate, a marble plate, a hanging piece, an adjusting piece and a fixing piece; the adjusting piece comprises an adjusting vertical plate and an adjusting transverse plate, the adjusting transverse plate is installed on a fixing transverse plate and connected with the fixing transverse plate through a connecting piece, the hanging piece comprises a plate body, the plate body is provided with a front plate face and a rear plate face, the front plate face of the plate body is provided with a protruding inserting part, the rear plate face of the plate body is provided with a connecting part, the plate body is installed on the adjusting vertical plate through the connecting part, the heat preservation plate is installed between the adjusting vertical plate and a fixing vertical plate, and the marble plate is installed on the hanging piece. The wall body structure comprises the integrated plate and a base layer wall body, the integrated plate is installed on the outer side of the base layer wall body, and the problems that in the existing wall body construction process, the marble plate subjected to dry hanging cannot be adjusted, the hanging piece cannot adapt to the design thickness of the heat preservation plate, construction is troublesome, and cost is high are solved.

A continuous forced feeding machine for mixed fat micelles proposed by the present invention includes a radially connected feeding container and a reducer driven by a motor (1), and a feeding screw shaft (15) connected to the rotating shaft of the reducer is fixed vertically. The joint-defense bridging mixing blade (5) extends vertically into the feeding port (16) of the screw forming machine (9), and on the circumference of the rod body at the tapered end of the feeding screw shaft, there are three layers consisting of upper, middle and lower layers. The feeding screw spinning feeder (6) composed of feeding screw spinning blades of different structures, and the middle layer screw blade (19) with a radial opening splitter groove (21), while allowing the material to start feeding into the screw feeding state, While letting part of the material return upward through the opening of the vane splitter groove, the material is exhausted and diverted, and the lower continuous spiral blade continuously feeds the material to the feed port of the screw press. The invention safely and stably feeds materials into the screw press machine uniformly, without agglomeration, without material blocking, and evenly feeds materials. The quality stability of the molding process of the mixed fat blasting charge is improved.

The invention relates to the technical field of municipal engineering devices, and provides a municipal anti-theft manhole cover. The manhole cover comprises a cover body, wherein the cover body is arranged on a base; drain holes, which are used for conducting drainage, are arranged in the cover body; a locking mechanism, by which the cover body is locked on the base, is arranged on the cover body; an opening component, which is used for opening the locking mechanism, is arranged at the bottom of the cover body; and the opening component is arranged between the cover body and the base. The cover body can be stably fixed to the base under a locking effect of the locking mechanism, so that a problem that the manhole cover can be stolen easily can be solved, and serious injuries on pedestrians and vehicles due to the absence of the manhole cover can be effectively prevented.

The invention discloses a coke oven heating system. Limit switches are respectively arranged at the movement limit positions at both ends of the piston rod of each hydraulic oil cylinder; piston rod flanges are respectively arranged at the two ends of the piston rod; when the piston rod flange moves to the limit position, the piston rod flange triggers the corresponding limit switch; the limit switch obtains the information of the actual state of the piston movement of the hydraulic cylinder and sends this information to the control unit of the coke oven heating system. The invention also discloses an exchange heating control method of the heating system. The present invention analyzes and diagnoses hydraulic faults by adopting optimized safety interlocking and adding oil circuit pressure detection devices, which eliminates the major safety hazards in the heating system when the hydraulic system fails in the prior art, and can identify the hydraulic faults of the gas heating system in time, and carry out Safe stop effectively improves the safety performance of the coke oven heating system.