61results about How to "Reduce personal safety hazards" patented technology

The invention relates to a method for refurbishing old wall ceramic tiles. Three materials are adopted for overglazing the old ceramic tiles at normal temperature by four steps, and the steps are base layer treatment, coating of a bottom surface material special for ceramic tiles, coating of a middle layer material special for the ceramic tiles, and coating of a glaze material special for the ceramic tiles. The bottom surface material can be well combined with the surfaces of the ceramic tiles and cannot fall off; the middle layer is a bridge, has the property similar to the bottom layer and the surface layer, and can better bear the bottom layer and the glaze layer, so that the whole surface is more plump; and the glaze layer can achieve the glaze effect similar to the surfaces of the ceramic tiles. The method overcomes the defect that the traditional method for refurbishing and transforming the ceramic tiles has high difficulty and high cost, can maintain the decoration effect of the original ceramic tiles simultaneously, and also can change the colors of the surfaces of the ceramic tiles according to customer requirements. The materials are environment-friendly and nontoxic, and the normal office work is not influenced in the construction process.

The invention discloses a preparation method of a transparent conductive thin film with a grating structure. The method comprises the steps of adopting a pulse laser of which the pulse width is less than 20ns, and the wavelength is 400-1000 nanometers, ensuring that a laser beam emitted from the pulse laser is positioned with a distance of 0-2.55 millimeter above an M layer of an M / TCO glass transparent conductive thin film after passing through a focus formed by lens focusing, controlling the laser energy to be 0.70-1.30J / cm<2>, and controlling the scanning speed to be 5-20mm / s; performing one-way line-by-line scanning on the laser beam, controlling the scanning line overlapping rate to be 50-70%, and performing laser irradiation treatment on the surface of the M / TCO thin film, so that crystals on the surface of the conductive thin film are subjected to re-crystallization, and a regular grating structure is induced on the surface. The preparation method is simple in process operation, short in preparation time and good in controllability, does not need to introduce harsh environmental conditions such as special gas or liquid medium and the like, and improves the light transmittance of the thin film.

The invention discloses a slag removing machine for an ore-smelting furnace, which comprises a slide way frame device, a pitching device, a lifting device and a slag removing device, wherein a moving trolley is driven by a motor drive so as to realize extension of a slag removing arm; a hydraulic cylinder drive is connected with a rotating shaft so as to realize pitching of the slag removing arm; the lifting of the slag removing arm is realized through the hydraulic cylinder drive; the rotation of the slag removing arm is driven through the motor; and therefore, the whole device controls the actions such as the rotation, pitching and lifting of the slag removing machine and the extension of the slag removing arm through a hydraulic system so that slag removing work with different angles at different positions is finished.

The invention relates to the field of valve casting, in particular to a furnace-front mechanical hand for molten iron casing. The furnace-front mechanical hand comprises a whole machine rotating support mechanism, a vertical lifting mechanism, a material conveying mechanism and an extending mechanism, wherein the whole machine rotating support mechanism is connected with the vertical lifting mechanism, the vertical lifting mechanism is connected with the extending mechanism, the extending mechanism is connected with the material conveying mechanism, the lower end of the whole machine rotating support mechanism is fixedly arranged on the ground through a base, the furnace-front mechanical hand also comprises a computer control system and a balance mechanism, the computer control system is electrically connected with each mechanism, one end of the balance mechanism is connected with the whole machine rotating support mechanism through a support rod, the other end of the balance mechanism is connected with the extension mechanism, and the balance mechanism is connected with the vertical lifting mechanism through a support plate. The furnace-front mechanical hand has the advantages that the intelligent control is realized, the personnel safety of workers is ensured, and the work efficiency is improved.

The invention relates to a livestock breeding environment automatic control system which comprises an environment monitoring subsystem, a cloud platform and a control subsystem and further comprises afirst transmission module, a second transmission module and a third transmission module, the environment monitoring subsystem communicates with the cloud platform through the first transmission module, the cloud platform communicates with the control subsystem through the second transmission module, the environment monitoring subsystem is used for monitoring environment data information in the breeding workshop, the cloud platform is used for comparing and analyzing the environment data information, and the control subsystem is used for adjusting environment conditions of the breeding workshop according to a comparison and analysis result. The system has the effects of being high in automation degree and high in production efficiency.

The invention relates to the valve pouring field, in particular relates to a stokehole auxiliary robot used for pouring molten iron. The stokehole auxiliary robot comprises a molten iron kettle, wherein the molten iron kettle is fixed on a molten iron kettle support by virtue of a molten iron kettle support base, the molten iron kettle support is connected with a lifting screw rod, the other end of the lifting screw rod is provided with a lifting sensor, the molten iron kettle is connected with a lifting servo motor, the molten iron kettle is connected with a molten iron kettle inclining servo motor, and a molten iron kettle inclining sensor is arranged between the molten iron kettle and the molten iron kettle inclining servo motor, so as to control an inclination angle of the molten iron kettle. The stokehole auxiliary robot disclosed by the invention solves the problems that working efficiency is low and potential safety hazard exists in operation; moreover, the stokehole auxiliary robot has the advantages that intelligent control is realized, personal safety of working personnel is guaranteed, and working efficiency is improved.

The invention aims at providing a gate door opening / closing device. A torque motor drives a connecting rod transmission mechanism to drive the opening or closing of a door component; the torque motor is electrically connected with a controller; the controller sets a resistance value for the torque motor; when the torque motor detects that the resistance value of the door component exceeds the set resistance value, the torque motor is stopped or rotated reversely; a connecting rod transmission mechanism limiting device automatically detects the opening or closing point of the door component; and anti-pinch and forced-opening functions as well as an automatic opening function in the case of power failure of the gate door are realized. The gate door opening / closing device provided by the invention reduces the personal safety hazard of people passing through the gate door and brings convenience to people.

The invention discloses an intelligent metal plate molding machine. The intelligent metal plate molding machine comprises a base, an upper mold plate, a lower mold plate, an ejection oil cylinder, stand columns, an edge pressing module, a molding oil cylinder and edge pressing oil cylinders, wherein the lower mold plate is fixedly mounted on the base, the piston rod of every edge pressing oil cylinder penetrates the upper mold plate and is connected with the upper mold plate, and the molding oil cylinder, the edge pressing oil cylinders and the ejection oil cylinder are all connected with a pump control hydraulic system. The pump control hydraulic system comprises a plurality of hydraulic control check valves and a first electro-hydraulic directional control valve, wherein the plurality of hydraulic control check valves are used for respectively locking the oil supply pipelines of the plurality of edge pressing oil cylinders during the edge pressing process, and the first electro-hydraulic directional control valve is connected with the hydraulic control check valves. The pump control hydraulic system is connected with an automatic control system which is used for adjusting the output pressure of the pump control hydraulic system. The intelligent metal plate molding machine can automatically adjust the pressure of the pump control hydraulic system according to the drawing force needed during the workpiece drawing process, can guarantee the product quality, is low in power loss and good in energy-saving performance, can automatically achieve feeding and blanking and has a high production efficiency, low production costs and a low accident occurrence rate.

The invention relates to a metal part thermal forming two-man ladle mechanical arm which comprises the mechanical arm, a program control cabinet and a portal frame. The mechanical arm is mounted on the portal frame, the program control cabinet is fastened to a side wing of the portal frame, the mechanical arm is electrically connected with the program control cabinet, and the mechanical arm comprises a casting ladle lifting transportation mechanism, a casting ladle horizontal plane swing mechanism, a casting ladle vertical plane swing mechanism, a positioning mechanism and a temperature measurement mechanism. The mechanisms act on the casting ladle to achieve movements such as lifting transportation, rotation, positioning, casting and reciprocating loading and transportation. According to the metal part thermal forming two-man ladle mechanical arm, the PLC microcomputer technology controls the movements of the parts, the sequence of the movements, the time and relative angles of the movements, work efficiency is high, and the operation is safe.

The invention discloses an ice flood observation system based on the technology of computer vision. A system which consists of an observation device, data processing equipment and terminal equipment is designed, wherein the observation device and the data processing equipment are in wireless signal connection. Moreover, a data collection and processing method based on the above system is also designed, and the method comprises the steps: automatically collecting image data through a camera mechanism, and transmitting the image data to the data processing equipment through a wireless signal; carrying out the image space conversion of the image collected by the camera mechanism through the data processing equipment, thereby achieving the quantitative analysis of ice flood distribution image data of a river. The beneficial effects of the invention are that the structure is simple; the design is reasonable; the system reads the ice flood data of engineering observation points in a region from one display according to the collection time; the system is high in data reading precision, is high in timeliness, is convenient and quick, can save a large amount of observers, alleviates the labor intensity, and eliminates the personal potential safety hazards.

The invention discloses a clamp for automatic disassembly and assembly of a container deck lock. The clamp is characterized by comprising a clamp body and a shifting fork. The clamp specifically comprises a seat body, the top surface of the seat body is concave downwards to form a groove, and the groove is used for containing the lower portion of the deck lock; and one side wall of the groove is provided with a through groove running through the side wall, and the through groove extends from top to bottom. One end of the shifting fork is located outside the groove, the other end of the shifting fork penetrates through the groove via the through groove, and the shifting fork can rotate along the through groove and can pull a buckle, for disassembly and assembly, of the deck lock. Compared with the prior art, the clamp has the advantages that a pure mechanical structure is adopted to automatically realize lock disassembly and assembly, the reliability is high, personal safety hazards arereduced, and the efficiency is improved.

The invention discloses a three-phase synchronous deicing device for a power transmission line, and belongs to a device for automatically advancing and striking to deice on a three-phase power transmission line. An advancing device along the three-phase power transmission line mainly comprises three advancing wheels, a front supporting wheel and a rear supporting wheel, wherein the advancing wheels are arranged on a transmission shaft which is driven by a motor through a gear transmission mechanism; the front supporting wheel and the rear supporting wheel are positioned at a front position and a rear position of the middle part of the transmission shaft; and all the advancing wheels and the supporting wheels are arranged on a bottom plate. A striking deicing device mainly comprises an upper swing arm and a lower swing arm which are arranged on a direct current motor; and the bottom plate is correspondingly provided with a swing arm slotted hole and a crushed ice through hole for providing a movement space for the upper swing arm and the lower swing arm. A control part of the device comprises a control circuit, an emitter, a receiver and the like. The control circuit comprises a circuit for controlling the positive rotation and the reverse rotation of a traveling motor and a striking direct current motor through a plurality of relays and a coupling oscillation circuit with oscillation frequency of 2Hz consisting of the relays, an electrolytic capacitor and a triode. The device has the characteristics of remote control, automatic advancing and automatic deicing.

The invention provides a truss welding device. The truss welding device comprises a machine frame and two welding brackets, wherein the two edges of the middle of the machine frame are provided with platform guide rails, the welding brackets are in a C shape and installed on the two sides of the machine frame correspondingly, a fixed rod and a moving rod are installed between the first edge and the opposite second edge of the welding bracket, and a welding assembly plate is slidably installed on the fixed rod and the moving rod; and welding gun bases, a supporting frame, a rebar platform, a cutting device and a height control plate are further arranged. The truss welding device is overall of a cuboid structure, is limited to occupied area and achieves automatic welding of main body steel pipes and web bar rebars of multiple height specifications of trusses, in addition, the truss welding device is high in welding precision and small in quality fluctuation, the manual operation cost isreduced, potential personal safety hazards in the welding process are decreased, and the production efficiency is greatly improved.

The invention relates to a special method or equipment for installing, maintaining, repairing or dismantling electric cables or electric wires, in particular to a tool for fixing 10kV insulated conductors. The tool for fixing the 10kV insulated conductors is characterized by comprising a main clamp arm, an auxiliary clamp arm, a clamp jaw, a transmission bar and an offsetting spring; the clamp jaw comprises a fixing part and a movable part which are hinged with each other and are respectively installed at the front end of the main clamp arm and the front end of the auxiliary clamp arm; a long-shaped groove is arranged at the internal side of the main clamp arm; a position-limiting member is installed in the long-shaped groove; one end of the transmission bar is fixedly connected onto the auxiliary clamp arm; and the other end of the transmission bar is a movable end which is positioned in the groove of the main clamp arm, can slide in the groove by taking the long groove as a guide rail and supports against the position-limiting member. By fixing the insulated conductors and using a wire-stripping tool in a coordination manner, the tool for fixing the 10kV insulated conductors has the advantages that: the problem of swinging caused by the distortion and energy storage of the conductors is solved; and the insulation layers are easy to strip off, and the discontinuous wire-stripping or the repeated wire-stripping is not needed, so that the time for stripping is reduced, the working efficiency is greatly enhanced, and the potential safety hazards of wires are prevented or reduced.

The invention discloses an automatic assembling and welding device and method for a pressure vessel, and belongs to the technical field of pressure vessel welding. The device comprises lifting mechanisms for lifting a shell ring to be separated from a longitudinal shell ring conveying mechanism, an automatic grounding device, an inner expanding rounding device and a shell ring welding circular seam back protection device, wherein a welding station used for butt welding of two shell rings is arranged in the middle of the longitudinal shell ring conveying mechanism, a special welding machine is arranged above the welding station, the lifting mechanisms are arranged on the two sides of the welding station, and transmission mechanisms used for circumferential rotation of the shell rings are arranged on the lifting mechanisms, and the automatic grounding device comprises a fixed base mounted in the middle of the longitudinal shell ring conveying mechanism, and the inner expanding rounding device extends into the shell ring to calibrate a shell ring connector. By using the device, the shell ring assembling precision can be improved, the shell ring welding quality and efficiency are improved, a large amount of labor cost is reduced, and the working intensity is reduced.

The invention discloses an aluminum billet casting machine, and relates to the field of casting machines. The aluminum billet casting machine comprises a rubber vulcanization machine base and a workbench; an oil tank is arranged at the lower end of the rubber vulcanization machine base; a supporting vertical column and an overturning vertical column are arranged on the rubber vulcanization machine base; the workbench is arranged on the supporting vertical column and is hinged to the overturning vertical column; an overturning oil cylinder is arranged between the workbench and the rubber vulcanization machine base; the overturning oil cylinder is respectively hinged to the workbench and the rubber vulcanization machine base; the overturning oil cylinder is connected with an oil tank; a movable die device is arranged at one upper end of the workbench, and while a fixed die device is arranged at the other end of the workbench. The aluminum billet casting machine is simple and reasonable in structure; the cost is saved; the potential risk for human body is reduced; the labor intensity of workers can be greatly reduced; the production efficiency is increased; the product quality is stable.

The invention provides an oversized-area efficient energy-saving vacuumizing soft foundation treatment system and a construction method. The system is composed of a vacuumizing device, a gas-liquid separation device, a water collection device and an automatic vacuum data transmission device. The automatic vacuum data transmission device is composed of a vacuum data signal sensor, an automatic vacuum data transmitter and a vacuum data receiver. The vacuum data signal sensor is composed of a pressure induction module and a pressure data collection module. The vacuum data receiver is composed of a wireless signal receiving module and a display module. According to the system, the mode that data are monitored by a worker everyday is changed into the mode that data are automatically transmitted and monitored and technicalization and automation of the construction technique and management are facilitated; the structure that a jet pump and a water storage tank are designed in a split mode is adopted in the gas-liquid separation device, so that the system is transported, repaired and replaced in a soft foundation conveniently, and the defect that the traditional vacuum preloading technology is large in power consumption is overcome by the system.

The invention discloses a real-time state evaluation method for safety tools, relates to the field of safety tools, and solves the problem of real-time state evaluation for safety tools. The present invention includes establishing a ledger of safety equipment to collect information; calling the information of the safety equipment to be tested to determine the real-time state of the safety equipment to be tested; establishing a state model of the safety equipment to be tested, and comparing the state model with two types of data to analyze data results; Carry out real-time comprehensive evaluation of the safety equipment; then judge whether the safety equipment to be tested is normal; if not, formulate a monitoring method corresponding to the safety equipment to be tested according to the type of the safety equipment to be tested. The present invention correctly evaluates the scrapping, maintenance and use of safety tools and appliances through various monitoring methods, does not waste available resources, and improves economic benefits.

The invention relates to the technical field of automobile rotating shaft welding, in particular to an automobile rotating shaft welding forming surface fine treatment system. The automobile rotatingshaft welding forming surface fine treatment system comprises an automobile transmission shaft and further comprises a clamping device used for clamping the automobile transmission shaft, an autorotation device used for rotating the clamping device and a cutting and grinding device used for removing welding slag. The clamping device comprises supporting columns, a mounting table, a clamping groove, a clamping block, a containing groove, a clamping column, clamping torsional springs, clamping plates, stirring strips and an inner supporting mechanism. The autorotation device comprises a supporting frame, a driving groove, autorotation gears, rotating columns, a rack groove, a matching rack, a rotating motor and a driving gear. The cutting and grinding device comprises a combined groove, a rotating table, a mounting column, a telescopic air cylinder, a matching block, driving teeth, a mounting disc, a mounting block and an executing assembly. The automobile rotating shaft welding formingsurface fine treatment system has the effects of multiple functions, automatic polishing and reduction of potential safety hazards to workers.

A ground wire hook device with a self-locking function disclosed by the present invention comprises a mounting plate and a hook body, the hook body is fixedly mounted on the upper end face of the mounting plate, two mounting grooves are symmetrically formed in the inner wall of the hook body, a magnet is fixedly mounted on the inner wall of each mounting groove, and a magnet is fixedly mounted on the inner wall of each mounting groove. Iron blocks are slidably connected into the mounting grooves, a plurality of limiting barbs are vertically arranged on the sides, away from the magnets, of the iron blocks at equal intervals, and each iron block is sleeved with a magnet exciting coil. The stress condition of the hook is monitored through the pressure sensor, effective hooking of a grounding wire is ensured based on scientific data analysis, meanwhile, the hook is locked based on pulse driving, the problem that the hook is loosened due to the influence of external wind power is solved to a certain extent, power can be supplied through the battery, power consumption is low, and the size is small; and the situation that a worker hangs the grounding wire by feeling and experience is avoided, the situation that the hook is loosened and falls off is prevented, and personal potential safety hazards are reduced.

The embodiment of the invention provides a window character display control method and device, a vehicle and a readable medium, and is applied to a terminal, the method comprises the following steps: when the terminal creates a page, monitoring a text window created in the page, and obtaining the window attribute of the text window, wherein the window attributes comprise character sizes and font units; determining a target text window based on the font unit, wherein the target text window comprises a target character size; judging whether the size of a preset system font is changed or not when the page in the system is refreshed, the system font having a scaling parameter; and if yes, refreshing the characters in the target text window by adopting the target character size and the scaling parameter. Therefore, when the size of the font of the system is changed, the characters in the window can be directly refreshed, so that the speed of changing the sizes of the characters is high, the use experience of a user is improved, and the workload of developers is not increased.

The invention discloses an operation method for improving sleeper replacement efficiency and reducing personal potential safety hazards, and relates to the technical field of railway construction. The method comprises the following steps that cooperation personnel quickly loosen about forty cement sleeper binding nuts in the front in advance, remove elastic strips, pinch plates and the like, and then replace the sleeper in a five-in-five-out mode in a rotating mode; the cooperation personnel quickly insert the prepared clamping plates into cement sleeper bolts with nuts on the outer side of a steel rail, tighten screw openings through an electric wrench, continue to loosen twenty-five cement sleeper fastener nuts in front of the sleeper replacing machine and remove and collect the elastic strips, the buckle plates and the like, and the operation is repeated. According to the operation method for improving the pillow replacement efficiency and reducing the personal potential safety hazards, the pillow replacement efficiency can be improved by about 50%, and the square pillow penetrating efficiency can be improved by 90%-130%; due to the fact that only two cooperation persons are needed and do not need to work under the bottom of the end of the sleeper changing machine, the potential safety hazards are greatly reduced.

The invention provides an oversized-area efficient energy-saving vacuumizing soft foundation treatment system and a construction method. The system is composed of a vacuumizing device, a gas-liquid separation device, a water collection device and an automatic vacuum data transmission device. The automatic vacuum data transmission device is composed of a vacuum data signal sensor, an automatic vacuum data transmitter and a vacuum data receiver. The vacuum data signal sensor is composed of a pressure induction module and a pressure data collection module. The vacuum data receiver is composed of a wireless signal receiving module and a display module. According to the system, the mode that data are monitored by a worker everyday is changed into the mode that data are automatically transmitted and monitored and technicalization and automation of the construction technique and management are facilitated; the structure that a jet pump and a water storage tank are designed in a split mode is adopted in the gas-liquid separation device, so that the system is transported, repaired and replaced in a soft foundation conveniently, and the defect that the traditional vacuum preloading technology is large in power consumption is overcome by the system.

The invention discloses a coal field drilling depth measuring device, which relates to the geological related field, comprises a depth detection mechanism, a signal transmission mechanism and a secondary signal receiving mechanism, and is characterized in that the depth detection mechanism, the signal transmission mechanism and the secondary signal receiving mechanism are connected through electric signals; the depth detection mechanism comprises a depth detection base plate, the top end of the depth detection base plate is provided with an air blowing mechanism access plate, one end, far away from the depth detection base plate, of the air blowing mechanism access plate is provided with an air inlet, the bottom end of the depth detection base plate is provided with an air bag recovery port, and the side wall of the bottom end of the depth detection base plate is provided with a hinge support; meanwhile, when the measuring rod is used, by arranging an independent signal transmission mechanism, the rock drilling depth in a mine pit can be measured according to the signal strength, and the problem that a traditional measuring rod is inaccurate in measurement in a rugged environment is solved; and meanwhile, potential personal safety hazards to the measuring personnel possibly caused by the fact that the measuring personnel enter an unstable environment are reduced.

The invention relates to an overturning and discharging device for a baked graphite electrode saggar. The device comprises an upper cover rotating part (3), a lower cover rotating part (5), an overturning part (4), a hydraulic system (14), a coupling (1), a power shaft (8), a main shaft support frame (7), a support shaft (6), a support device (9) and the like, and is characterized in that: the support shaft (6) of the overturning part (4) is connected with the power shaft (8); a power hydraulic cylinder (15) is connected to the power shaft (8) by the coupling (1); the upper cover rotating part (3) and the lower cover rotating part (5) are provided with lateral hydraulic cylinders (2); the overturning part (4) is connected with the support device (9) by the support shaft (6); and ground nails (10) are arranged on a ground base by the support device (9). By the overturning and discharging device provided by the invention, the damage of dust generated by the conventional discharging method to workers can be greatly reduced, the work efficiency can be improved, and both waste of filling materials and cost can be reduced.

The invention discloses a smoke alarm installation device. The smoke alarm installation device comprises an installing shell, a wall adhering plate is integrally arranged at the bottom of the outer side of the installing shell, a plurality of expansion screws penetrate through and are connected to the surface of the wall adhering plate, a closed cavity is formed in the inner side of the installing shell, an installing groove is formed in the axis position of the bottom end of the wall adhering plate, a limiting ring groove is formed in the outer side of the installing groove, and a plurality of evenly-distributed sliding blocks are slidably connected into the limiting ring groove. According to the smoke alarm installation equipment, a smoke alarm body is horizontally hoisted, a first double-shaft motor enables two storage coils to synchronously store a rope, under the cooperation of a travel switch, an infrared sensor and a single-chip microcomputer, the storage coils have the two states of being driven and being not affected by movement, finally the smoke alarm body is automatically and accurately installed and fixed, disassembly, replacement and maintenance are convenient and fast, a worker does not need to climb to a high position for operation by adopting a tool, the personal potential safety hazards of the worker are reduced, and the working efficiency is improved.

The invention relates to a split-phase electrified deicing device, belonging to mechanical and electrical integrated deicing equipment for a power transmission line. A control part consists of a transmitter, a receiver and a control circuit. A mechanical part comprises a traveling unit, a deicing unit and the like. In the traveling unit, a traveling wheel is a gear with a groove in the middle anda traveling motor drives the traveling wheel to rotate through a driving gear to move forwards or backwards along the power transmission line; and the deicing unit consists of a double-pendulum striking hammer which is installed on a motor and rotates forwards and backwards within 180 degrees together with the motor so as to strike to remove ice covering the power transmission line. In consideration of balance during movement, a dynamic balance device is also designed and consists of a liquid level switch, a set of gear transmission mechanism and a counterbalance. When a bottom plate tilts, the liquid switch is turned on, the motor is electrified to drive the gear transmission mechanism to rotate, the counterbalance is enabled to move on the bottom plate to change the gravity center of the device and therefore the bottom plate is kept in a balanced state. The split-phase electrified deicing device has the advantages of remote control, automatic traveling and automatic icebreaking.

The invention provides a steel bar welding position correction device. The steel bar welding position correction device comprises a first position correction structure, a second position correction structure and a top end limiting structure. The first position correction structure and the second position correction structure are arranged oppositely and can horizontally slide face to face. The first position correction structure and the second position correction structure are both provided with position correction parts. The position correction parts get close to each other to clamp and locatetwo welding spots of steel bars. The top end limiting structure is arranged between the first position correction structure and the second position correction structure and used for limiting the vertical positions of top protrusions of the steel bars. Through cooperation of the two matched position correction structures and the top end limiting structure, the steel bar welding position correctiondevice automatically complete correction of the two welding spots of the steel bars to enable the welding spots of the steel bars to be aligned with the welding positions of a steel tube, the locating precision of the welding spots and the automatic welding accuracy and quality of a truss are improved,

The invention discloses a method for preventing a hard roof of a high-gas stope from collapsing and falling to burn gas, and relates to the technical field of coal mine safety. Preventing measures are taken from multiple aspects of the factors of gas detonation caused by collapsing and falling of the hard roof of a stope face of a highly gassy mine, the construction method is easy and convenient to implement, through experiments of many times, the preventing effect is obvious, cost is low, the method is suitable for being applied and popularized within a large range of a mine lot, the probability that the hard roof of the highly gassy mine causes gas detonation is reduced, and the potential hazard to personal safety of underground coal miners is reduced.

The invention discloses efficient permanent magnet motor direct-drive screw pump oil mining and transporting equipment and belongs to the field of oil mining equipment. The efficient permanent magnet motor direct-drive screw pump oil mining and transporting equipment comprises a screw pump component (9) and is characterized in that a bottom centralizer (1), an efficient permanent magnetic submersible electric unit, a serial bearing pack and a bidirectional thrust universal coupler (6) are sequentially mounted at the lower portion of the screw pump component (9) from bottom to top, an oil delivery pipe (17) is connected to the upper portion of the screw pump component (9), a plurality of valve components are mounted in the oil delivery pipe (17), and the upper end of the oil delivery pipe (17) is connected with surface equipment. By the arrangement, reliability and transmission efficiency of products can be greatly improved, service life of the equipment is prolonged, bearing force is high, and requirements on high delivery lift and large displacement units are met.