107results about How to "Strong connection" patented technology

The invention discloses a door lock cooperative voice transmission method and system, and the method comprises the steps: triggering a voice call connection process according to a voice call connection between a Bluetooth tag device carried by a mobile user and an initial door lock; according to a user face image captured by a door lock along the way through a camera and a Bluetooth label signal, the advancing direction of a user is recognized, and the door lock in the advancing direction is informed to enter a continuous preparation state through multicast communication; according to connection requests of a plurality of opposite users received by a middle door lock, when a path conflict is detected, re-planning a connection path of at least one user; and according to the coordination result, switching the connection path of the coordinated user to the door lock of the opposite door or the jumping door lock, and completing stable handover of the voice call when the user arrives at a new connection door lock. By utilizing the embodiment of the invention, seamless and stable connection of voice communication among a plurality of door locks can be realized, path conflicts are avoided, and the communication continuity and experience of a user in a mobile scene are improved.

The utility model discloses a kind of tapping hole sliding plate inlay plate pressing device, including pressing table, slag baffle sliding plate and inlay plate, the top of pressing table is fixedly installed with side plate by support foot, the top of side plate is fixedly installed with hydraulic telescopic pump by top plate, the bottom of hydraulic telescopic pump is fixedly installed with pressing plate, the top of pressing table is provided with slag baffle sliding plate, the top of slag baffle sliding plate is provided with inlay plate, lower pressure assembly for carrying out around knocking to inlay plate is provided on side plate, it is related to tapping hole sliding plate relevant field, rotation movement is carried out by driving motor under L type motor plate to drive driving gear, driving gear engages synchronous rotation movement on the rotation gear of annular sliding slot, rotation gear drives push column to carry out around movement in the four around movable hole, the top four around inlay plate is rotated interval by push column and pressed down, so that inlay plate can be evenly stressed and enter into slag baffle sliding plate, improve the quality of slag baffle sliding plate.

The invention relates to the technical field of robot control, and provides a multi-stage compliance control and track deviation correction system and method for a grinding robot. The multi-stage compliant control and track deviation correction system of the grinding robot comprises an AGV chassis, a Z-axis servo module, a force control grinding head, a laser detection unit, a six-dimensional force sensor and a main controller. According to the multi-stage compliant control and track deviation correction system for the grinding robot, zero-missing grinding and zero-overlapping precise splicing of adjacent grinding paths can be achieved through a macro track deviation correction algorithm based on a virtual guide rail, and response lag of a force control system is eliminated through front laser feedforward pre-judgment control; the problems that in the weak texture environment, track drifting occurs, the adaptability of the complex curved surface is poor, and force control response is not timely are solved, and the purposes of high-precision track deviation correction and compliant force control of large-area complex curved surface grinding are achieved. In addition, the invention further provides a method applied to the multi-stage compliance control and track deviation correction system of the grinding robot.

This utility model provides a novel universal power adapter, relating to the field of power adapter technology. It includes a housing assembly comprising an outer shell, an interface end cover, and a socket bottom cover. The socket bottom cover also includes an adapter circuit board mechanism disposed between the outer shell and the inner shell. A heat dissipation assembly comprises a heat dissipation sleeve embedded within the outer shell. A threaded heat-conducting plate is embedded in the heat dissipation sleeve. The threaded heat-conducting plate has a threaded structure, and the heat dissipation sleeve has annularly distributed heat dissipation holes. Heat generated during device operation is transferred to the outer shell and then conducted to the heat dissipation sleeve embedded therein. The threaded structure of the threaded heat-conducting plate increases the contact area with heat, efficiently absorbing heat and rapidly conducting it along the threaded path. The annularly distributed heat dissipation holes on the heat dissipation sleeve allow air to circulate inside and outside the sleeve. Hot air is discharged from the heat dissipation holes, and cool air is introduced, achieving continuous heat dissipation and maintaining a stable internal temperature of the device.

The application discloses a kind of electric shovel slewing vertical shaft devices, including slewing vertical shaft, shaft sleeve, slewing pinion, bearing, the shaft end baffle fixed in the lower end of slewing vertical shaft by coupling bolt and pressure sensing system, pressure sensing system includes power module, wireless transmitting module and wireless receiving module, each bolt hole on the shaft end baffle is provided with a pressure sensor, power module is fixed on the bottom surface of shaft end baffle, pressure sensor is electrically connected to power module and is connected with wireless transmitting module, wireless receiving module is arranged on the slewing platform of electric shovel, wireless transmitting module is communicatively connected to wireless receiving module, wireless receiving module is communicatively connected to alarm device arranged in the cab of electric shovel.The application monitors the state of coupling bolt in real time through pressure sensing system, when monitoring that coupling bolt loosens, alarm signal is formed in the cab of electric shovel, avoid safety accident to occur, improve the safety of equipment.

This utility model relates to the field of drainage pipe technology and discloses a quick-sealing connector for drainage pipe interfaces. It includes a drainage pipe body, with a connector body located at the right end of the drainage pipe body. Two mounting plates are fixedly connected to the top of the connector body. A groove is formed at the top of the connector body, located at one end of each mounting plate close to the other. The two mounting plates are connected by a limiting bolt threaded to the inner wall of a nut. This utility model ensures alignment of the connector body with the drainage pipe body by placing the connector body at the right end. A rotating ring is fixed to the right end of the drainage pipe body, and then a connecting ring is fixed to the right end of the rotating ring, ensuring a tight connection between them. A fixing block is fixed to the right end of the connecting ring, ensuring a tight fit between the external thread on the left end of the fixing block and the internal thread of the connecting ring. A waterproof rubber ring is installed between the connecting ring and the fixing block.

The present application relates to the technical field of coal mine conveying, and particularly relates to a mine scraper chain structure, which comprises a chain body, a mounting plate, a spring one, a spring two, a telescopic baffle, a contact plate, a threaded column, a lifting box and a telescopic plug plate, and the chain body is arranged in parallel in the left-right direction and has two; the mounting plate is placed on the two chain bodies, the height of the lifting box is adjusted, the telescopic plug plate is pulled out from both ends and passes through the eyelet in the chain body, the lifting box is adjusted upward again, the telescopic plug plate is tightly pressed on the inner upper surface of the chain body, the end of the telescopic plug plate and the mounting plate is fixed by using a bolt and a nut, quick installation is completed, the operation is convenient, the connection is stable, the fastening property is good, when conveying materials, the telescopic baffles on both sides are pushed outward by the spring two, the contact plate is tightly attached to the inner walls on both sides of the groove, the scraper body is always tightly attached to the groove bottom by the spring one, thereby effectively reducing the gap, reducing the conveying omission of the materials and improving the conveying efficiency of the device.

The invention discloses a bearing capacity self-adaptive scheduling system and method for a high-proportion new energy power grid, and relates to the technical field of power system scheduling. The system adopts a three-layer structure: a multi-dimensional bearing capacity state generation layer constructs a power grid digital twinborn body which can be updated in a rolling manner, models bearing capacity into a multi-dimensional bearing capacity state variable and maps the multi-dimensional bearing capacity state variable into a bearing capacity constraint parameter, and constructs an operation feasible region; a rolling scheduling optimization decision-making layer establishes a rolling scheduling optimization model of cross-time scale coupling under the uncertainty of new energy output, and generates a scheduling scheme meeting the operation feasible region constraint and the consistency constraint; and the online safety check and feedback layer performs online safety check by adopting an agent model based on the digital twinborn body, outputs a corrected bearing capacity constraint parameter to update the operation feasible region and trigger re-solving, and issues an execution instruction and writes back operation feedback for continuous updating after the check is passed. According to the method, the real-time performance and the scheduling performability of the security boundary description can be improved, and the new energy consumption capability is improved.

This invention discloses an industrial control board testing device, comprising: an insulated box with an inlet and a second conveyor belt; a first conveyor belt disposed on the outer side of the second conveyor belt away from the insulated box; a testing unit disposed above the feeding section of the first conveyor belt; a cylinder mounted on the side of the first conveyor belt opposite to a transition plate; a strip-shaped baffle disposed on the side of the second conveyor belt opposite to the transition plate; a first guide plate and a second guide plate disposed on the side of the strip-shaped baffle opposite to the first conveyor belt and above the second conveyor belt; and a guide portion formed at the other end of the second guide plate that is inclined toward the second conveyor belt opposite to the first guide plate. This invention can quickly screen out defective products based on the test results through the cooperation between the testing unit and the cylinder, and can also achieve stable connection and high-precision transport of good products, facilitating the direct feeding of good products into the insulated box for high and low temperature testing, thus improving testing efficiency.

The utility model discloses a kind of vertical cabinet board diagonal connecting piece and cabinet body, it is related to the technical field of furniture accessories, the utility model aims to solve the problem that the strength is lower when existing connecting piece is applied to the connection of 9mm cabinet board vertical diagonal, obvious top hole or connection trace will be stored on cabinet board, the utility model includes arc connecting body, the connecting body middle part is provided with protruding connecting part and recessed avoidance slot, the connecting part is close to the surface on the side of avoidance slot and is provided with clamping body, two connecting holes are set in the upper and lower sides of the avoidance slot, and the two connecting holes are respectively provided in the upper and lower sides of the avoidance slot;The convex blade is provided on the two arc-shaped edges of the connecting body.

The utility model provides a hollow glass door body and a refrigerator. The hollow glass door body comprises a door frame and hollow glass, the hollow glass comprises inner glass and outer glass, and the door frame comprises a door body frame arranged on the periphery of the hollow glass and arranged in an L shape; the door body inner frame is connected between the door body frame and the hollow glass, the two ends of the door body inner frame are connected with the two ends of the door body frame in a clamped mode to form a containing space filled with a foaming agent, and the door body outer frame is connected with the door body inner frame in a buckled mode to define a mounting groove used for mounting the hollow glass. In the utility model, the door body inner frame and the door body outer frame simultaneously buckle and press the hollow glass to achieve a stable state. The foaming agent is filled between the door body frame and the door body inner frame, so that condensation of the door body frame is effectively reduced. Meanwhile, the foaming agent is not in contact with the hollow glass, different types of hollow glass can be replaced according to different use environments so as to meet specific use requirements, and higher compatibility is achieved.

The utility model belongs to the field of circuit breakers, and particularly relates to an isolation circuit breaker which comprises a mechanism frame, a circuit breaker unit and an isolation switch unit, the isolation switch unit comprises an isolation shaft, an isolation knife and a static contact, the isolation knife is in linkage fit with the isolation shaft, the isolation knife acts along with the isolation shaft, and connection or disconnection of the isolation knife and the static contact is achieved. Two cooling fins are arranged at the positions, corresponding to the two sides of the isolation knife, of the static contact, one end of each cooling fin is provided with a contact part extending in the direction of the isolation knife, and when the isolation knife is connected with the static contact, the contact parts of the two cooling fins are attached to the two sides of the isolation knife respectively; the two cooling fins are additionally arranged on the static contact, when the isolation knife is connected with the static contact, the contact portions of the two cooling fins are attached to the two sides of the isolation knife, the cooling fins can conduct heat of the isolation knife, heat dissipation of the isolation knife is facilitated, and therefore temperature rise can be reduced.

This utility model discloses a backrest lock, including a base plate. A locking hook and a locking plate are movably disposed on the base plate. The end of the locking plate has a pull head for connecting and cooperating with an external car pull rod, so that when the pull rod is pulled, the locking plate swings to release the restriction on the swing of the locking hook. The inner wall of the locking hook has a positioning strip for synchronously moving along the swing trajectory of the locking hook when it swings. The inner wall of the base plate has a positioning structure that works in conjunction with the positioning strip to guide the swing trajectory of the locking hook and limit the direction of the hook's swing, and an auxiliary structure that works in conjunction with the positioning structure to limit the wobbling or loosening of the locking hook when it is subjected to vibration and to improve the smoothness of the hook's swing. This utility model solves the problems of unstable hook swing trajectory and insufficient positioning accuracy in traditional backrest locks, easy loosening or wobbling of the locking hook under vibration, and insufficient smoothness of the hook's swing leading to operational jamming.

This utility model provides a detachable and retractable blind box mahjong machine, relating to the technical field of blind box mahjong machines. It includes four separate modules, which are detachably connected to form a rectangular blind box mahjong machine. Each separate module also includes an arc-shaped receiving portion and two table legs. The four receiving portions of the four separate modules together form a mahjong tile receiving space extending towards the lower part of the module. The advantages of this utility model are: in terms of structural design, the mahjong machine is divided into four separate modules, which are easily assembled using a snap-fit ​​structure. The modules can be stacked for storage, greatly saving storage space and making it easy to carry, solving the problems of inconvenient storage and large size of traditional mahjong machines; its connection method is stable and can withstand various forces during normal use; damaged modules can be replaced individually during maintenance, reducing maintenance costs; the panel is detachable and can hide the mahjong tiles, increasing the fun; the overall practicality is strong, and it is suitable for various usage scenarios.

The utility model discloses a drying application device with a pipeline incrustation cleaning structure, relates to the technical field of drying application, and aims to solve the problems of pipeline blockage and low heat efficiency caused by incrustation accumulation of a closed water circulation system. On the basis of a drying room, a water supplementing tank, a circulating hot water pump, an air energy normal-temperature and high-temperature heat pump unit and other components are arranged, detachable connecting sleeves and connecting pipes are arranged on the outer sides of pipelines such as a main water pipe entering the drying room, cross rods are arranged on the inner sides of the pipelines, and the cross rods are matched with a cleaning device composed of a cleaning wiper and a pull rope. During use, the connecting sleeve and the connecting pipe are disconnected, the pull rope is pulled to enable the cleaning eraser to move in a manner of being attached to the inner wall of the pipeline, and scale can be quickly scraped. According to the device, through a convenient incrustation cleaning structure, corrosion of chemical cleaning to the pipeline is avoided, and the maintenance cost is reduced; pipeline heat transfer performance is recovered, and energy utilization efficiency is improved; the drying room has the advantages of being reasonable in structure and high in practicability.

The utility model discloses a high security liquid oxygen blasting device, including a plurality of liquid oxygen explosion pipe, each liquid oxygen explosion pipe all is installed with branch line, a plurality of branch line common installation has main line, the end of main line is installed with two plug -in post, one side of two plug -in post common is equipped with detonator, the top of detonator is installed with protective cover, be equipped with limiting mechanism on the protective cover, be equipped with four adjusting mechanism on the protective cover, the outer wall fixed connection of detonator has two C type handle that is symmetrically set, install rotary button on detonator, be equipped with two insertion slot on detonator, two plug -in post all cooperate with insertion slot. The utility model discloses through the setting of protective cover and its limiting mechanism, can reliably isolate sundries, greatly promote operation security, the adjusting mechanism on protective cover can adjust support leg height flexibly, make control equipment also can keep level on the uneven ground, be convenient for staff operation.

The utility model relates to the technical field of color steel tiles, in particular to a color steel tile with a heat insulation function, which comprises a metal single plate, a heat insulation layer is arranged below the metal single plate, and a protective layer is arranged below the heat insulation layer. The front end and the rear end of the metal single plate are upward to form triangular clamping grooves, so that the metal single plate can be conveniently butted with a photovoltaic module, and the joint of the pair of triangular clamping grooves and the middle part of the metal single plate is step-shaped. According to the color steel tile with the heat preservation and heat insulation function, the metal single plate, the heat preservation layer, the protective layer and the like form a composite structure, the good heat preservation and heat insulation effect is achieved, the service life is longer, triangular clamping grooves are upwards formed in the front end and the rear end of the metal single plate, and the color steel tile can be in butt joint with a photovoltaic module through the triangular clamping grooves; the photovoltaic assembly can be conveniently installed on the color steel tile, and the triangular clamping groove at the front end of the rear metal single plate can slide into the triangular clamping groove at the rear end of the front metal single plate, so that the adjacent color steel tiles can be connected, and the overall cohesion of the color steel tiles is stronger.

The utility model provides a novel combined type building template fixing structure, which relates to the technical field of novel combined type building templates, and comprises a main body mechanism, the main body mechanism comprises a splice plate I, a splice plate II is arranged on one side surface of the splice plate I, through holes are formed in the splice plate I and the splice plate II, and the splice plate I and the splice plate II are arranged in the main body mechanism. The outer surface of the first splicing plate and the outer surface of the second splicing plate are sleeved with hexagonal blocks, and the hexagonal blocks are slidably connected with the first splicing plate and the second splicing plate. According to the utility model, through the arrangement of the main body mechanism, the splice plate I and the splice plate II can be conveniently connected, and meanwhile, the connection between the splice plate I and the splice plate II is stronger, so that the splice plate I and the splice plate II can form a whole in actual use, and further the splice plate I and the splice plate II can be connected through a similar connection mode; therefore, the combined building template can form a larger and tighter building template.

The utility model relates to the technical field of regulation and control gates, in particular to a farmland water diversion port regulation and control gate structure which comprises a lower movable gate, an upper fixed gate, a gate frame, a fixator, a chain and a fixing rod. The gate frame is fixed at the boundary of the main channel and the side channel, and the contact surface is sealed by glass cement; the upper fixed gate is in rigid connection with the gate frame, the lower movable gate is in sliding fit with the gate frame in the vertical direction through a sliding rail in the gate frame, and the lower movable gate is 2-3 cm longer than the upper fixed gate; the chain is composed of a plurality of closed chain rings and fixed to the top of the lower movable gate through a fixator, and the top end of the chain is connected with a pull ring. The fixed rod is vertically installed on the upper portion of the gate frame, and the pull ring is sleeved with the fixed rod to lock the opening degree of the lower movable gate. A stilling pool and an apron are arranged on the downstream of the side channel, and the apron is laid by masonry. According to the method, the channel water distribution and water resource utilization efficiency can be improved, and the channel irrigation accuracy is enhanced.

The utility model discloses a convenient fast-assembly retractable grading ring for a field test, which comprises an air bag, a plurality of groups of metal covers are uniformly arranged on the outer side of the air bag, the plurality of groups of metal covers are connected with each other through wires, an inflation and deflation port is arranged at the bottom of one side of the inner side of the air bag, and the inflation and deflation port is communicated with the air bag. Six sets of hook-and-loop fastener connecting assemblies are evenly arranged on the edge of the bottom of the air bag. According to the utility model, through mutual cooperation among the air bag, the metal cover, the lead and the hook-and-loop fastener connecting assembly, when the device is installed, the device can be covered on experimental equipment, the grading ring and the experimental equipment are rapidly and reliably connected through the hook-and-loop fastener A and the hook-and-loop fastener B, and the connection effect is enhanced through clamping of the clamping groove and the buckle; the installation and maintenance time is greatly shortened, and after the device is installed, the grading ring can inflate and expand the air bag when a product test is carried out in a use state, so that the diameter of the grading ring meets the voltage and anti-corona requirements.

The application discloses a multifunctional scanning rod for temporary dentures and relates to the technical field of oral implantation and repair. The scanning rod comprises a shell, an expansion sleeve, an inner screw, a threaded sleeve and a reference rod. An assembly hole is arranged in the shell and penetrates in the axial direction, a fixed part of the expansion sleeve is fixed in the assembly hole, and an expansion part is surrounded by a plurality of elastic expansion plates and is gathered to the axial line in a natural state. The inner screw has an outer threaded section and a distraction section, the threaded sleeve is internally provided with a first reverse conical insertion hole and a second insertion hole with an inner thread, and the outer periphery of the threaded sleeve is provided with a first outer thread and a second outer thread with different pitches. The outer threaded section of the inner screw is connected with the second insertion hole, and the distraction section is located in the expansion part. The rod part of the reference rod is threadedly connected with an inner mounting hole of the inner screw. When the reference rod is rotated, the distraction section radially expands the expansion plates. The scanning rod has adjustable locking force, high connection rigidity and can significantly improve the reliability of in-mouth scanning data.

This utility model discloses a fire hydrant pressure testing device, relating to the field of fire protection testing technology. It includes a fire hydrant pressure testing connector, which can be installed at the fire hydrant outlet. A fixed plate is fixedly connected to the side of the fire hydrant pressure testing connector. A disc is fixedly connected to the side of the fixed plate away from the fire hydrant pressure testing connector. A hexagonal groove is formed on the disc, and a sliding column is slidably connected inside the hexagonal groove. A clamping plate is fixedly connected to the sliding column. A rotating disc is rotatably connected to the fixed plate, and a sliding groove is formed on the rotating disc. The clamping plate fits snugly at the connection between the fire hydrant pressure testing connector and the fire hydrant outlet. This clamps the connection between the fire hydrant pressure testing connector and the fire hydrant outlet, improving the connection strength. Furthermore, silicone sealant can tightly fit the gap at the connection, reducing the entry of external air into the fire hydrant pressure testing connector and thus improving the accuracy of pressure measurement.

The utility model relates to the technical field of electrical equipment, in particular to a power socket and a double-sided socket module thereof. The double-sided socket module comprises two groups of socket units which are arranged back to back and are fixedly connected, and an L-pole conductive strip and an N-pole conductive strip which are arranged between the two groups of socket units, and the two groups of socket units are each consistently equipped with at least one power taking potential; and when the two groups of socket units are fixedly connected in a back-to-back manner, the contacts in the socket units are conducted with the L-pole conductive strips and the N-pole conductive strips. According to the scheme, on one hand, two groups of socket units opposite to each other can be fixedly connected without a socket shell, and on the other hand, the mounting structure can be simplified.

The invention relates to a single-phase Internet of Things intelligent electric energy meter, and relates to the technical field of electric meters, and the electric energy meter comprises an electric meter body which is provided with a wiring area, a display area and a drainage channel arranged in a thickness direction in a penetrating manner, a terminal cover with a seal, a connecting screw with a first hole channel, and an elastic plugging mechanism. The terminal cover is provided with a plug-in solenoid, and the threaded hole is axially opposite to the threaded groove of the wiring area in a closed state. When the connecting screw is inserted in place, the first hole channel in the screw rod is communicated with the second hole channel in the side wall of the inserting screw pipe and forms an air guide flow channel with the drainage channel, and an external air source removes dust in a wiring area through the flow channel. And after the connecting screw is taken away, the plugging mechanism seals the port of the second hole channel under the elastic action to hide the channel. According to the structure, dust removal convenience and channel concealment are both considered, and the electricity larceny prevention effect can be improved.

The utility model discloses an air valve adjusting wrench which comprises a sleeve and a fixing rod arranged on the right upper side of the sleeve, a sleeve block is arranged on the inner side of the sleeve, a connecting rod is arranged on the right upper side of the sleeve block, a quadrangular groove is formed in the inner side of the bottom of the sleeve block, a hexagonal groove is formed in the inner side of the bottom of the sleeve, and the connecting rod is connected with the hexagonal groove. The air bag is arranged outside the upper left side of the sleeve block, the oil injection groove is formed in the inner side of the middle of the sleeve block, a user can achieve lubricating operation by simply extruding the air bag through the air bag and the oil injection groove structure, extra tools or complex steps are not needed, the efficiency of lubricating a to-be-adjusted structure is greatly improved, and the maintenance time cost is saved. In the working scenes of actual maintenance or valve adjustment and the like, lubricating oil can be quickly supplemented to a connecting part, normal operation of equipment is ensured, in addition, the air bag is in threaded connection with the sleeve block, a user can easily complete lubricating oil supplementation by himself / herself, professional technicians or special equipment are not needed, and the maintenance difficulty and cost are reduced.

The application discloses a coupling structure of an energy storage connector, and provides the advantages of simple assembly and disassembly, prevention of wrong insertion, and 360-degree rotation (whole line) allowance; the coupling structure comprises a male module and a female module; the male module is provided with a handle part and a head part connected with the handle part, the head part is provided with an outer wall, an inner wall, a plug-in cavity and at least three limiting parts arranged on the inner wall, the head part is provided with a plug-in barrel and a conductive part arranged in the plug-in barrel; and the female module is provided with a secondary plug-in barrel, the secondary plug-in barrel is provided with a secondary outer wall, a secondary inner wall and a secondary plug-in cavity; the secondary plug-in cavity is provided with a secondary conductive part; when the plug-in barrel is inserted into the secondary plug-in barrel to form an electrical connection, the secondary outer wall of the female module is tangent to (or tangent with) the limiting parts of the male module, at least three tangent points are formed, the secondary plug-in barrel is forced to be detained or surrounded in the plug-in cavity, and the stable coupling effect is achieved.

The utility model discloses a water inlet section for a submersible pump. The water inlet section comprises a pump body, a first water inlet section and a second water inlet section, an inner thread is formed in the inner side of the bottom end of the pump body, a first water inlet section is detachably connected to the inner thread in a threaded mode, a lug plate is fixed to the inner side of the first water inlet section, and a first filter screen is detachably installed at the lug plate through a fastening bolt. The first water inlet section and the second water inlet section are detachably connected to the bottom end of the first water inlet section in a threaded mode, the connection mode is firm, looseness is effectively prevented, and mounting and dismounting are convenient. The first filter screen is arranged in the first water inlet section, the second filter screen is arranged in the second water inlet section, and the mesh diameter of the second filter screen is larger than that of the first filter screen; water can be doubly filtered, impurities are effectively prevented from entering the pump body, abrasion of parts in the pump body is reduced, and the service life of the pump body is prolonged.

The application discloses a kind of multistage variable frequency air conditioning system operation control method and system, this includes: for each air conditioning unit in multistage variable frequency air conditioning system Set minimum operating frequency;Adopt real-time air temperature and preset target temperature comparison, and according to comparison result, the working frequency of air conditioning unit is regulated;For any two air conditioning units adjacent to each other, judge whether the current working frequency of front stage unit is greater than minimum operating frequency, if not, then, judge whether the output frequency of rear stage unit is greater than X% of rated frequency, if yes, then control front stage unit to run at minimum operating frequency, if not, then control front stage unit to gradually reduce load according to preset time period, until shutdown;Based on the above operation control method, not only can avoid system shock caused by frequent start-stop of front stage unit, but also can limit the unloading rate of front stage unit, even under the environmental conditions of season alternation, two-stage unit can also be smoothly connected.

This application discloses an LED display screen, relating to the field of LED display screen technology. The LED display screen includes a cabinet, LED display units, and an arc adjustment mechanism. The cabinet includes a first frame, a second frame, a first hinge structure, and a second hinge structure. The first hinge structure is rotatably connected between the first and second frames at their first ends, and the second hinge structure is rotatably connected between the second ends of the first and second frames. The LED display units are connected to the first and second hinge structures. The arc adjustment mechanism is located between the first and second frames and is used to adjust and fix the arc of the LED display units. This LED display screen solves the problem that current LED displays cannot achieve flexible angle adjustment while ensuring connection strength and angle consistency.

The utility model relates to the technical field of inverter supporting pieces, in particular to an inverter insulation bearing assembly which comprises a concave-character-shaped supporting plate used for supporting an inverter, ejector rods are arranged on the end walls of the two sides of the supporting plate in a penetrating mode and connected with the end walls of the two sides of the supporting plate in a threaded mode, one end of each ejector rod is fixedly connected with a screw base, and the other end of each ejector rod is fixedly connected with a nut. And the other end of the ejector rod is in contact with the end wall of the inverter. When the inverter is supported on the upper end face of the supporting plate and the size of the inverter is not matched with the size of the distance between the end walls of the two sides of the supporting plate, the screw seat rotates, the ejector rod rotates, the ejector rod and the supporting plate are in threaded transmission and displacement, the end of the ejector rod makes contact with the end walls of the inverter, the inverter is limited, the supporting plate and the inverter are firmly connected, and the inverter is prevented from shaking.