40results about How to "To achieve the transmission effect" patented technology

A shift tilting-type wafer automatic transmission device overcomes the shortcomings that the prior art can not make complex movements in the narrow space of the manufacturing process; the wafer automatic transmission device comprises a machine frame, a feeding platform, a bellows body and an arm mechanism and is technically characterized in that a lower arm of the arm mechanism is connected with a grasping mechanism through a shift mechanism and a tilting mechanism which are assembled together; an assembly gear connecting rod transmission mechanism is used to drive the grasping mechanism to rotate around the axis; a grasping motor of the grasping mechanism drives a gripping claw to move back and forth; and a positioning mechanism on the grasping mechanism is provided with an adjustable positioning block. The device has rational design and stable transmission and running in the production process, as well as flexible and reliable movement; the device expands the scope of application and can realize bilateral shift and tilting of a wafer box while the device completes the automatic wafer transmission in the horizontal or vertical state of the wafer so as to fully realize the automatic transmission in a small space in which the center distance of the parallelly arranged process equipment is less than the center distance of the transmission equipment; moreover, the device can flexibly stop in the face of external interference to achieve the precisely controlled transmission effect.

The invention discloses a shoe cabinet with automatic cleaning function for smart home, which comprises anti-skid feet, a shoe cabinet main body, a shoe cabinet dustproof board, a partition, a pick-and-place door, a transmission device and a cleaning device. The lower end of the shoe cabinet main body is Anti-skid feet are welded, a partition is installed inside the main body of the shoe cabinet, the main body of the shoe cabinet and the partition form a clean room, a transmission device is installed inside the clean room, and a cleaning device is installed on one side of the main body of the shoe cabinet , both ends of the transmission device are equipped with a rotating cylinder, and the outside of the rotating cylinder is connected by a conveyor belt. The outer surface of the conveyor belt is equipped with equidistantly distributed shoe holders, and the inside of the rotating cylinder on the side away from the access door is A rotating shaft is plugged in, and the cleaning device is installed with a connecting pipe inside the main body of the shoe cabinet, and an atomizing nozzle is installed on the side of the connecting pipe close to the transmission device. The invention can clamp the shoes, drive the shoes to move inside the cleaning room through the rotating motor, and carry out disinfection through the cleaning device.

The invention discloses a stranding machine which comprises a wire feeding mechanism A, a wire feeding mechanism B and a wire draw-in mechanism, wherein the feeding mechanisms and a wire pay-off mechanism are fixed on the same framework, the lower end of the wire feeding mechanism A is provided with a wire pay-off main drive gear type belt pulley which is connected with a reverse clutch, a gear form belt pulley arranged at the lower end of the reverse twist clutch is connected with a gear form belt pulley arranged at the lower end of a motor by belts, the belt pulley arranged at the lower end of the motor is connected with a gear form belt pulley arranged at the lower end of the wire feeding mechanism B by a gear form belt, another arranged at the lower end of the wire feeding mechanism B is connected with a gear form belt pulley of an alternative gear, and a gear form belt pulley arranged at the lower end of the wire draw-in mechanism is connected with a drive motor. The invention can realize two functions of reverse twist, pair stranding and triple reverse twist, complete two conventional techniques in one machine one tome and increase the productive capacity 50%. Pitch of strand of the invention is completed in lines by the main drive output, and the pitch of strand has high stability. The three main machines of the invention use vertical structure. The cover area of the invention is reduced to 50% of the original one.

The invention discloses a uniformly-sprayed irrigation device which comprises two beams. Supporting legs are fixedly connected at the bottoms of the beams, fixed blocks are fixedly connected at the bottoms of the beams, motors are fixedly connected at the bottoms of the fixed blocks, first bevel gears are connected with output shafts of the motors in a clamped manner and engaged with second bevelgears, rotating shafts are fixedly connected at axes of the second bevel gears, winding wheels are connected on the surfaces of the rotating shafts in a clamped manner, the surface of each winding wheel is fixedly connected with one end of a pulling rope, and the pulling ropes are connected with rollers of the left sides of the beams in an overlapped manner. According to the novel uniformly-sprayed irrigation device, rotation of the motors drives the bevel gears and the winding wheels to rotate to draw the pulling ropes to draw sliding plates, so that the sliding plates slide in first throughholes. The device is provided with a spring, reset of the spring draws the sliding plates, so that a sprayer reciprocates, and the whole irrigation device is formed by the two supporting legs and thetwo beams.

The invention discloses a well type thermal treatment furnace for a ring piece. The thermal treatment furnace is arranged in a laid foundation below a horizon line of a workshop. A furnace bottom channel which can facilitate maintenance of the thermal treatment furnace is arranged between a furnace body of the treatment furnace and the foundation; a middle barrel is arranged in the furnace body; furnace linings are arranged on both the inner wall of the furnace body and the outer wall of the middle barrel and are respectively tightened and fixed through stainless steel and round steel; a plurality of heating elements positioned by high-aluminum porcelain nails are hung on the furnace linings; a furnace cover with heat insulation property and sealing property is also arranged at the top end of the furnace body; and a lifting mechanism and a moving mechanism are arranged on the furnace cover. The well type thermal treatment furnace is simple in structure and convenient to manufacture, is generally used for performing thermal treatment such as hardening, normalization, quenching, annealing and tempering on medium and large size metal ring pieces and is relatively professional periodic thermal treatment equipment which is more energy-saving.

The invention relates to a single-speed electromagnetic fan clutch for cooling an automobile engine, and aims to provide an electromagnetic fan clutch which can lead a fan to run at full speed to cool under the condition that power is switched off suddenly. The electromagnetic fan clutch comprises a transmission shaft, a transmission disc, a fan fixing disc, a first transmission, a second transmission and a first electric control device, the transmission disc is fixedly mounted on the transmission shaft, the fan fixing disc is mounted on the transmission shaft via a first bearing, the second transmission is fixedly connected with the fan fixing disc, and when powered, the first electric control device drives the first transmission to lead the second transmission to be separated from the transmission disc; and when in power failure, the first electric control device drives the first transmission to lead the second transmission to be connected with the transmission disc. The invention further relates to a manufacturing method and a control method for the electromagnetic fan clutch.

The invention discloses an oiling device for a spring part of a clock. The oiling device for the spring part of the clock comprises a base, a shell arranged on the base and a spraying assembly installed on the shell. The spraying assembly further comprises an oiling tube and a fixed frame for fixing the oiling tube. The oiling device further comprises a pressure adjustor arranged above the shell for providing pressure for the oiling tube, a driving mechanism installed on the base, a synchronous servo motor driving the driving mechanism to work and a rotary table driven by the driving mechanism. The rotary table is arranged right below the oiling tube. The oiling device for the spring part of the clock provided by the invention uses gear transmission and is simple in structure, and not only is the surface of the spring part of the clock oiled uniformly and the work efficiency improved, but also the service life of the device is prolonged, and the oiling efficiency of the spring part of the clock is improved. A baffle is further arranged in the oiling device with a plurality of spraying assemblies so that oil mists sprayed by the oiling tubes of different spraying assemblies are effectively blocked, interference among the oil mists is prevented, and the demand of meeting the actual production is better met.

The invention discloses a self-unfolding and self-gathering vibrating type vibrating rod for concrete construction, belongs to the technical field of concrete construction, and can realize that underthe linkage of a variable-speed linkage assembly, a driving rod moves up and down relative to a connecting sleeve to drive an annular piston to move up and down, and the annular piston moves upwards to extrude air into a strip-shaped balloon. When the vibrating rod is inserted into concrete, the strip-shaped balloon tends to be horizontally stretched, so that the self-unfolding vibration plate isdriven to be unfolded outwards, when the vibrating rod is inserted into the concrete, the self-unfolding vibration plate can be automatically unfolded, the vibration range of the vibrating rod is effectively enlarged, the vibrating efficiency is improved, and when the vibrating rod is pulled out after vibrating is completed, the self-unfolding vibrating plate can be automatically folded, the spacearea formed when the vibrating rod is drawn out is reduced, then the proper construction amount is guaranteed, the vibrating efficiency and the construction quality can be considered, and on the premise that the construction quality is guaranteed, the vibrating efficiency is effectively improved, and the practicability is remarkably improved.

The invention relates to mobile communication technology, specially a data transmission control method in MIMO system, receiver and data transmission control system, the problem that simplifying H-ARQ mechanism in current technology and every emission antenna can be controlled at the same time is resolved. Said method includes: receiving end ensures the speed matching relationship of every emission antenna in corresponding TTI and feedback to the sending end; sending end ensures speed matching relationship of every emission antenna in next TTI and executes speed matching. And, the receiving end ensures average modulating mode or modulating mode of every emission antenna and feedback to the sending end; the sending end modulates data which is to be transmitted in next TTI based on the feedback modulating mode. A speed matching and executing module is connected with every emission antenna of said multi antenna receiver.

The invention discloses a dyeing device with the functions of multiple water filtration and automatic washing. The dyeing device comprises a device body, the bottom on the left side of the device bodyis fixedly connected with a water pump, the top of the device body is fixedly connected with a fixing frame, a first motor is fixedly connected in the fixing rack, and the bottom of an output shaft of the first motor penetrates through the device body and stretches into the device body and is fixedly connected with a connection frame. According to the dyeing device, water is conveyed to a conveying pipe through the water pump, then the water is sprayed to a washing cylinder through the conveying pipe, at the same time, the first motor drives the washing cylinder to rotate for washing, and a first filtering screen and a second filtering screen are driven by a transmission mechanism to conduct up-down floating filtration, so that the first filtering screen and the second filtering screen are prevented from being blocked. The problem that a filtering screen of an existing multiple filtration washing dyeing device is easy to block is solved, the dyeing device with the functions of multiple water filtration and automatic washing has the advantage of being not prone to blocking, and the filtration efficiency is improved.

The invention discloses a coil coupling type underwater wireless electric energy transmitter. The transmitter comprises a transmitting end and a receiving end; the transmitting end comprises a transmitting end coil, a transmitting end circuit board, a connecting cable, a first communication line and a transmitting end fixed point; the receiving end comprises a receiving end coil, a receiving end circuit board, an MCU and a second communication line; the receiving end circuit board, the MCU and the second communication line are arranged in an underwater vehicle; the receiving end circuit boardis connected with the MCU through the second communication line; the transmitting end circuit board is arranged in the transmitting end fixed point; and the transmitting end circuit board is connectedwith a base station through the connecting cable and the first communication line. An underwater wireless electric energy transmission system is optimized, so that the system is more humanized, and unnecessary electric energy loss is reduced; and a wireless communication function of the underwater wireless electric energy transmitter is set, so that great convenience is provided for the underwater wireless electric energy transmission system.

The invention relates to the technical field of ceramic automatic machining complete equipment, and discloses an automatic movable grinding device of a ceramic machining production line. The automatic movable grinding device comprises a rack, the rack is made of a metal material and used for supporting the whole grinding device, the right side of the rack is fixedly connected with a first motor, the first motor is a reverse rotation motor, the first motor is used to drive a first electric shaft to rotate, and the first electric shaft is fixedly connected to the upper part of the first motor. According to the automatic movable grinding device for the ceramic machining production line, a suction pump is fixedly connected to the left side of a second motor, a water tank is fixedly connected to the lower portion of the suction pump, and a water pipe is fixedly connected to the right side of the suction pump, the end, away from the suction pump, of the water pipe is fixedly connected with an atomization nozzle, water in the water tank is pumped into the water pipe through the suction pump and conveyed to the atomization nozzle, and therefore water mist sprayed out through the atomization nozzle is fused with dust generated during grinding, and the effect of avoiding dust flying is achieved.

The invention discloses a transmission structure. The transmission structure comprises an output cam, retainer assemblies, pulling rings, steel ball assemblies and an input cam. The pulling rings, theretainer assemblies as well as the input cam and the output cam are symmetrically disposed on the two sides of the steel ball assemblies. The input cam rotates to drive rollers of one retainer assembly to rotate, then the rollers drive one pulling ring to rotate, the other side of the pulling ring makes contact with steel balls in the planetary positions, the pulling ring drives the steel balls to perform autorotation, the steel balls perform autorotation to drive the other pulling ring at the output end to rotate, the other pulling ring drives the other retainer assembly and the output cam to rotate, and therefore the transmission effect is achieved. The transmission structure is mainly applied to a continuously variable transmission of a bicycle, and is steady in transmission, free of pause and transition and capable of achieving one-way transmission so as to prevent backward sliding during upslope riding.

The invention discloses a novel gear transmission gear box, and belongs to the field of gear boxes, the novel gear transmission gear box comprises a box body, a transmission assembly is arranged in the box body, a first mounting part and a second mounting part are arranged in the box body, a box cover is arranged at the top of the box body, and a gear transmission assembly is arranged in the box body. Two dustproof assemblies are arranged on the outer side of the box body, the transmission assembly comprises a first rotating shaft, a main shaft, three first gears and a first bevel gear, the left end of the first rotating shaft penetrates through and is rotationally connected to the left side of the box body, and the two ends of the main shaft penetrate through and are rotationally connected to the interior of the box body; and the first gear at the top is fixedly connected to the middle part of a first rotating shaft. Compared with a transmission gear box, the transmission distance is shortened, the fault rate of the gear box is reduced, the transmission effect is guaranteed, meanwhile, the torque direction can be adjusted according to the actual working requirement, and application and popularization are facilitated.

The invention discloses a bending device for hardware machining. The bending device for hardware machining comprises a box body, an outer frame is fixedly connected to the upper portion of the left side of the box body, a first sliding groove is formed in the right side of the outer frame, an inner cavity of the first sliding groove is movably connected with an opening and closing door, a connecting rod is fixedly connected to the lower portion of the right side of the opening and closing door, a plurality of air outlets are formed in the top of an inner cavity of the outer frame, a feeding port is formed in the rear side of the outer frame, a communicating pipe is inserted into an inner cavity of the feeding port, the left side of the communicating pipe extends to the rear side of the box body, a dust suction pump is arranged on the left side of the communicating pipe, the front side of the dust suction pump is fixedly connected with the box body, the left side of the communicating pipe penetrates through an inner cavity of the dust suction pump and extends to the outer side of the dust suction pump, and a rust removal plate is fixedly connected to the position, close to the center, of the top of the box body. The bending device is reasonable in structural design, a hardware body can be subjected to a series of operation such as rust removal, bending and collection, and hardware bending work can be conveniently carried out.

The invention discloses a fruit tree branch trimming assisting tool comprising a supporting seat, a connection frame and a load bearing frame, the supporting seat, the connection frame and the load bearing frame are arranged from bottom to top in sequence, and the supporting seat, the connection frame and the load bearing frame are all connected through connection rod mechanisms. The supporting seat comprises a supporting frame plate and supporting pillars vertically fixed to the upper surface of the supporting frame plate. Each connection rod mechanism comprises a first connection rod and a second connection rod. A supporting frame is movably provided with the first connection rods, and an electric push rod mechanism is movably arranged on the corresponding first connection rod. The surface of the load bearing frame is fixedly provided with sixth shaft rods, and the sixth shaft rods are movably provided with the second connection rods. The fruit tree branch trimming assisting tool issimple in structure and easy to operate, the height of the load bearing frame can be adjusted conveniently and rapidly through control over stretching and contracting of the electric push rod and thetransmission mechanism of the connection rods, a fruit grower stands in the load bearing frame, adjusts the height of the load bearing frame for different heights of fruit trees and trim the fruit tree branches.

The invention discloses a continuous ink supply ink box ink filling system based on oil ink for preventing ink bubbles and air spraying in a kettle way. The system structurally comprises a separated nozzle groove, an expanded plate continuous ink supply ink box, a tank cover plate, an ink tank pool, an ellipsoid plug, a finger hook sleeve cap, a containing tank and a filter element flat pipe belt. The separated nozzle groove is matched with the expanded plate continuous ink supply ink box to form an ink liquid moisture removal adsorption effect, so that the ink can be purified, the moisture can be dissipated at the output end, and bonding on the separated nozzle groove and the paper surface can be avoided. The ink liquid level is quantitatively output after a thin expanded plate is unfolded, the ink is continuously supplied to the upper part of a flow bed type and discharged from a lower water seepage bin, a simple support enables the oily fluid and a water body to be conveyed in a double-flow channel manner, a sliding pultruded cotton block slides to extrude a water absorbing cotton bed to discharge water through the rotation of a twisting rope winding seat, the activity of the cotton body is adjusted through the rotation of the twisting rope winding seat intermittently for a period of time, and the effects of water vapor isolation and ink purification and color enhancement of the oily ink filling system are achieved.

The invention discloses a steel pipe carrying and collecting vehicle for a construction site. The bottom of an equipment device main body is movably connected with a connecting belt, the inner side ofthe connecting belt is movably connected with a movable shaft, one side of the movable shaft is movably connected with rotating teeth, the top of the connecting belt is movably connected with a rotating shaft, one side of the connecting belt is movably connected with a movable wheel, a first hydraulic rod is movably connected to the top end of the interior of the movable wheel, and a movable shaft is arranged on the inner side of the connecting belt. According to transmission of the movable shaft, connection is performed through the rotating teeth, the transmission effect is conveniently achieved through rotation of the rotating teeth, and when the vehicle is required to walk on the road surface, first hydraulic rods can be put down; the equipment device main body can move conveniently through use of the movable wheels, a crawler belt is used for work, the stability is improved, the crawler belt and the movable wheels can be switched for use, fixing work and moving are convenient, andthe vehicle is applicable to buildings and has wide development prospects in the future.

The invention discloses a drying device for treating chicken and duck feces, including the base, the right side of the top of the chassis is fixedly connected with a transmission box, The left side ofthe top of the base is fixedly connected with a support plate, the left side of the transmission box is fixedly connected with a support seat, the top of the support seat is provided with a drying box, the right side of the drying box is provided with a cleaning mechanism, the top of the support plate is fixedly connected with a fixed plate, and the left side of the top of the fixed plate is fixedly connected with a hot air blower. As that drive mechanism drives the dry box to perform jerk cleaning during operation, As that inn wall of the drying oven can be prevent from adhering to the excrement, At that same time, the inn wall of the running dry box is cleaned by a cleaning structure, thereby having the advantages of convenience for clean, solving the problem that the existing chicken and duck dung treatment and drying device is not convenient for cleaning, and the chicken and duck dung treatment and drying device of the chicken and duck breeding is simple in operation, strong in practicability and convenient for users to use.

The invention discloses a novel rigid coupling capable of being used for high-speed rotary connection and a preparation method thereof. The novel rigid coupling comprises a left connecting flange, a connecting shaft and a right connecting flange, and a first regular hexagon inner hole is formed in the center of the end face of the left connecting flange in a penetrating mode. A plurality of first threaded holes and first counter bores are formed in the end face of the left connecting flange with the first regular hexagon inner hole as the center in a circumferential array mode, and the left connecting flange is arranged on the left end portion b of the connecting shaft in a matched and sleeved mode through the first regular hexagon inner hole. In order to protect important parts of a transmission system from being damaged, the connecting shaft can play a role of a fuse by forming an annular notch groove in the radial position of the connecting shaft, when the relative torque between a driving shaft and a driven shaft exceeds the designed maximum value, the connecting shaft will be broken. Therefore, important transmission parts on the driving shaft and the driven shaft are protected from being damaged, and the connecting shaft is replaced after troubleshooting.

The invention discloses a continuous waterproof drainage device for double-channel hydraulic engineering construction. A base is fixedly connected with the bottom of a fixing bottom plate; a spiral groove is fixedly connected with one side of the inner bottom end of the base; a connecting rod is connected with the interior of the spiral groove in an embedded mode; a water inlet pipe is connected with one side of the outer portion of a drainage box in an embedded mode; a drainage pipe is connected with the other side of the exterior of the drainage box body in an embedded mode; a limiting buckle is fixedly connected with one side of the water inlet pipe; and a limiting clamping part is fixedly connected with one side of the limiting buckle in an embedded mode. The base plays a supporting role and is internally provided with the spiral groove used for fixing the connecting rod and rotating the connecting rod into the spiral groove; the water inlet pipe and the water outlet pipe are connected with the interior of into the limiting buckle, and the limiting clamping part is arranged at the connecting position of the water inlet pipe and the water outlet pipe. When fixing, the limiting clamping part needs to be rotated into the connecting position; and the limiting clamping part needs to be rotated by a certain depth when being arranged, so that falling is prevented, workers can conveniently and rapidly fix the water inlet pipe and the water outlet pipe, and the device is suitable for being used in water conservancy projects and has wide development prospects in the future.

The invention relates to the technical field of printers, and discloses a laser bar code printer, which comprises a bar code printer body; a paper groove is formed in the bar code printer body, and afuser fixedly connected to the interior of the bar code printer body is arranged at the bottom of the paper groove; and the bottom of the fuser is provided with a photosensitive drum part fixedly connected to the interior of the bar code printer body. Through mutual cooperation of a forward motor, a forward driving shaft, a forward roller, a reverse motor, a reverse driving shaft and a reverse roller, the effect that the forward roller and the reverse roller rotate oppositely can be achieved, so that the purpose of transporting bar code labels is achieved, and meanwhile the purpose of positioning the bar code labels can also be achieved; and through mutual cooperation of the forward motor, a forward driving gear, the forward driving shaft, a forward chain, a forward driven gear and a forward driven shaft, the transmission effect can be achieved, so that the purpose of providing power for a serrated knife is achieved, meanwhile, the purpose of reducing a power source is also achieved, and the cost is reduced.

The invention provides a wireless transmission system, a wireless transmission method and a computer system. The wireless transmission system comprises a control unit, a first transmission unit, a second transmission unit, a plurality of switchers and a plurality of radio frequency transmission ends. The first transmission unit comprises a first transceiver module and a first media access control module. The second transmission unit comprises a second transceiver module and a second media access control module. The plurality of radio frequency transmission ends have a plurality of data flows for transmitting wireless signals. The control unit controls the plurality of switchers to make the first transmission unit and the second transmission unit connected with the plurality of radio frequency transmission ends respectively for distributing the plurality of data flows, and at the same time, controls the first transceiver module and the second transceiver module to execute data flow management. The invention can achieve the required transmission effect and avoids adding another wireless transmission system.

The invention relates to the technical field of building wallboards, and discloses a house roof for building. The house proof comprises a roof body, arc-shaped protruding plates are fixedly mounted at the top of the roof body, a concave is formed between the two arc-shaped protruding plates, clamping grooves are formed in the left side and the right side of the roof body, a stacking cavity is formed between the two arc-shaped protruding plates, and an extrusion mechanism is arranged in the stacking cavity, an impact mechanism is arranged in the arc-shaped protruding plates, and a transmission mechanism is arranged between the extrusion mechanism and the impact mechanism. By arranging an elastic belt, the weight of accumulated snow can be used for enabling the elastic belt to deform, after the elastic belt deforms, the extrusion mechanism can be driven to rotate, the extrusion mechanism rotates to drive the impact mechanism to work, the impact mechanism impacts the arc-shaped protruding plates, and the accumulated snow on the upper portion slides down under the impact effect, so that manual accumulated snow cleaning is avoided, and manpower and material resources are saved.

The invention discloses an oiling device for clock spring parts, which includes a frame assembly and a clamp assembly. The frame assembly includes a frame and a first-layer installation frame connected with the frame. A clamp assembly is installed on the rotating disc, a horizontal drive cylinder and a drive motor are arranged on the frame, an oil injection assembly is arranged above the clamp assembly, and the oil injection assembly is connected to the frame. The fixture assembly and semi-finished products are driven by the servo motor, which facilitates the oiling operation, meets the production requirements, and improves the work efficiency; the design of the adjustment device and the quick installation handle realizes the free adjustment of the height and the free adjustment of the angle. It is driven by a servo motor to avoid uneven oil injection caused by uneven speed. The regular arrangement of multiple oil injection components and the cooperation with the baffle plate can effectively atomize the oil stains and better from point to surface. Radiation, to achieve all-round oiling of the product, to better meet the production needs.

The invention discloses a power grid structure for avoiding override tripping of a small switch station suitable for urban residential. The structure comprises: a junction box, a digital display, a differential relay, a magnetic seat button, a shell frame cover, a breaker square box, a storage battery box and a line cap crimping device. Through cooperation of the breaker square box and the line cap crimping device, a substation lead is inserted into a line cap shaft rod cover, when an impact current is mistakenly operated, an insulating folded plate drives a rotating eccentric wire pressing head to form a circuit breaking protection effect, a cover cap square groove of a closing contact is erected on each air switch gate of a switch station, so that a jumper switching circuit to be subjected to override tripping obtains the filtering shielding effect of closed insulation arc extinction of a pin column barrel, and an I-shaped sectional column rotates to form a sectional treatment effectof the insulating folded plate, thereby achieving the carding protection of one-to-one pipeline embedding, facilitating time division line detection during maintenance, and when the tripping is achieved, the armature frame is high in on-off attraction definition, and the safe and accurate tripping protection circuit effect of the power grid of the urban residential is guaranteed.