1273results about How to "Ensure connection stability" patented technology

The invention discloses an energy storage grid-connected cabinet control management system, and particularly relates to the technical field of energy storage grid-connected cabinets. The intelligent power dispatching module is used for optimizing a charging and discharging strategy of the energy storage system and dynamically adjusting power output; the fault protection management module is used for detecting, preventing and processing a fault intelligent protection mechanism in real time to guarantee the safety of the system; and the intelligent monitoring communication module is used for collecting operation data of the grid-connected cabinet in real time and providing remote monitoring and communication support. By introducing the intelligent power dispatching module, the fault protection management module, the intelligent monitoring communication module and the energy optimization integration module, intelligent management and efficient dispatching of the energy storage system are achieved, the system can automatically adjust the charging and discharging strategy of the energy storage system by predicting the future power grid load, and the energy efficiency is improved. The power resource of the energy storage unit is reasonably distributed when the power grid demand changes, and the resource waste is avoided.

The invention relates to the technical field of wharf construction processing, in particular to a construction method for a front-edge double-pile bearing beam and a berthing component, according to a support building method, hoops are installed on front-edge double-row PHC piles to serve as anchoring points, cantilever beams are welded to the front edge sides of the hoops to serve as structures for supporting the berthing component, and the whole installation mode is simple, convenient and reliable; the double-layer hoops are adopted on the front-edge double-row PHC piles to serve as supports of different layers of structures, so that installation stability is guaranteed, later adjustment can be facilitated, and particularly, the installation levelness of the cantilever beam can be adjusted conveniently. In addition, the cross beams at the upper ends of the front-edge double-row PHC piles are connected through the supporting I-shaped steel oblique beams, so that the connecting stability between the front-edge double-row PHC piles and the rear-row double piles can be guaranteed, and the front-edge double-row PHC piles and the rear-row double piles are matched in different directions. The installation efficiency can be effectively improved by prefabricating the berthing component.

The utility model discloses an insulating anti-blocking structure and a thin film capacitor thereof. The insulating anti-blocking structure comprises an insulating part, a pasting part, a first copper bar and a second copper bar, the insulating part is positioned between the first copper bar and the second copper bar, so that the first copper bar and the second copper bar are insulated; two ends of the pasting part are respectively adhered to the insulating part and the first copper bar; the two sides of the pasting part are provided with blocking blocks extending outwards, and the blocking blocks are located between the first copper bar and the insulating part. By arranging the insulating part and the pasting part, the insulating property between the first copper bar and the second copper bar is ensured, and the production yield of the film capacitor is improved; by arranging the barrier block and the injection molding part, the injection molding material can be effectively prevented from overflowing between the insulating part and the first copper bar to influence the structural stability of the injection molding part and the product performance of the film capacitor.

The invention belongs to the technical field of power connectors, and discloses a combined power connector which comprises a plug shell and a socket board, a socket connector is fixedly connected to the middle of the socket board, and a conductive assembly used for being communicated with the socket connector is installed in the plug shell. The two swing rods swing rightwards through the grip, so that the openings of the locking rods and the swing rods are aligned with the first L-shaped rods, then the plug connector is inserted into the socket connector, and the grip is swung leftwards, so that the contact sliding of the two locking rods and the two first L-shaped rods automatically drives the plug shell to move leftwards; the plug connector and the socket connector are connected more easily, after the two swing rods are perpendicular, the connection stability of the plug connector and the socket connector is guaranteed, meanwhile, a second T-shaped rod automatically moves downwards through the elastic tension of a tension spring and is inserted into a limiting groove, the two swing rods cannot continue to swing, and therefore the plug connector and the socket connector can be connected more easily. Therefore, the socket connector and the plug connector are locked.

The utility model provides a broadband silencer and an engine air inlet system. The broadband silencer comprises an air inlet pipe, an air outlet pipe, a silencer shell connected between the air inlet pipe and the air outlet pipe, and a resonance sound absorption structure arranged in the silencer shell. The resonance sound absorption structure is made of an elastic vibration material and is configured to be tubular; the resonance sound absorption structure is connected between the air inlet pipe and the air outlet pipe and forms an air inlet channel together with the air inlet pipe and the air outlet pipe. The inner diameter of the silencer shell is larger than the outer diameter of the resonance sound absorption structure, and a silencing cavity is formed between the silencer shell and the resonance sound absorption structure. According to the broadband silencer, elastic vibration of the resonance sound absorption structure enables the silencing cavity to form a resonance cavity, energy of noise is converted into vibration kinetic energy, and therefore the silencing performance of the broadband silencer can be improved.

The invention belongs to the technical field of heat exchangers, powder metallurgy sintering technology application, ultra-low temperature technology, ultra-low temperature equipment and the like, and discloses a plum blossom type silver powder sintering heat exchange sheet and a mixing chamber. The plum blossom type silver powder sintering heat exchange piece comprises a supporting framework and a silver powder sintering block, a threaded hole and a plurality of through holes surrounding the threaded hole are formed in the supporting framework, and the threaded hole is used for being matched with an installation column of the mixing chamber. The silver powder sintered blocks are formed on the two oppositely-arranged faces of the supporting framework through sintering, and the silver powder sintered blocks are provided with connecting parts filled in the through holes. According to the plum blossom type silver powder sintered heat exchange piece, the concentrated-phase or dilute-phase heliumtrihelium tetra mixed liquid and the large surface area of the silver powder sintered block have the sufficient contact condition, the heat exchange effect and the heat exchange efficiency are improved, and the plum blossom type silver powder sintered heat exchange piece is compact in structure and quite suitable for a mixing chamber of a small-refrigerating-capacity dilution refrigerating machine.

The utility model discloses a combined type double-end drilling tool which comprises a first drill tip and a second drill tip which are oppositely arranged, a first connecting block is arranged at the bottom of the first drill tip, a second connecting block is arranged at the bottom of the second drill tip, a first thread is arranged on the outer side of the first connecting block, and a second thread is arranged on the outer side of the second connecting block. And internal thread connecting pipes are arranged on the outer sides of the first connecting block and the second connecting block. According to the first drill tip and the second drill tip which can be separated, the adaptability of the tool is improved, and a user is allowed to rapidly replace the drill tips according to different operation requirements. And meanwhile, the first connecting block and the second connecting block are connected and fixed through the internal thread connecting pipe, so that the connecting stability is ensured, and the loosening or falling risk in the working process is reduced. The design of the sliding rail and the sliding block ensures that the first drill tip and the second drill tip can be aligned in position when being combined, so that the first drill tip and the second drill tip can be easily connected through the internal thread connecting pipe.

The embodiment of the utility model provides a heat dissipation framework, a plug-in frame, network equipment and a communication system, relates to the technical field of communication, and is used for ensuring the heat dissipation requirement before and after network upgrading and reducing the cost at the same time. The heat dissipation framework comprises a heat dissipation frame body, at least one limiting piece and at least one fan box. The heat dissipation frame body is provided with a heat dissipation cavity. The heat dissipation frame comprises a first cavity wall and a second cavity wall which are oppositely arranged. And a first ventilation opening communicated with the heat dissipation cavity is formed in the heat dissipation frame body. The limiting piece is located in the heat dissipation cavity, and the limiting piece is arranged on the first cavity wall. A first containing cavity is formed between the surface of the side, away from the first cavity wall, of the limiting piece and the second cavity wall. The limiting piece divides the heat dissipation cavity into a second containing cavity and a third containing cavity in the extending direction of the limiting piece. The fan box is located in the heat dissipation cavity, and an air opening of the fan box faces the first ventilation opening. The fan box is in sliding fit with the limiting piece in the extending direction of the limiting piece.

The invention is suitable for the technical field of automobile shock absorbers, and provides an automobile adjustable damping shock absorber with a built-in electromagnetic valve and a characteristic modeling method thereof.The automobile adjustable damping shock absorber comprises a cylinder body, a lower base is fixedly installed at the lower end of the cylinder body, an air chamber assembly is installed on one side of the upper end of the lower base, and a connecting base is fixedly connected to the upper end of the inner wall of the cylinder body; the upper end of the connecting seat is in threaded connection with a connecting rod assembly, the lower end of the connecting seat is in threaded connection with an electromagnetic valve, the electromagnetic valve is connected with a piston assembly in a matched mode, the outer wall of the cylinder body is fixedly sleeved with a spring seat, a gasket is placed at the upper end of the spring seat, and a third spring is fixedly arranged between the gasket and the connecting rod assembly. The shock absorber has the advantages that the shock absorption capacity of the shock absorber is improved, the structure is optimized to enhance the temperature stability, the electromagnetic force and damping force output is stabilized, the action time lag and flutter of the valve element are reduced, the design period is shortened, and the development cost is reduced.

The utility model discloses a novel porous precast slab reinforcing assembly which comprises a plurality of first reinforcing strips, second reinforcing strips and third reinforcing strips (41), the first reinforcing strips are distributed in parallel to the stress direction of precast slabs (63) and located at the splicing seams of the precast slabs (63), and the third reinforcing strips (41) are distributed in parallel to the stress direction of the precast slabs (63). The second reinforcing strips are distributed in the direction perpendicular to the stress direction of the prefabricated plate (63), the second reinforcing strips and the first reinforcing strips are arranged at intervals, and the third reinforcing strips (41) wrap the side edge of the non-stress side of the prefabricated plate (63). The floor has the advantages of being good in floor integrality and capable of preventing floor leakage.

The invention provides an emergency stop reset control method and system for a charging pile, and relates to the technical field of data processing, and the method comprises the steps: receiving an emergency stop trigger signal, generating an emergency stop state signal, cutting off a main circuit power supply of the charging pile, and recording the operation state parameter of the current charging pile; classifying the operation state parameters through a preset safety threshold group to generate a normal state subset and an abnormal state subset; performing multi-dimensional analysis on the abnormal state subset; when the analysis result is prohibition, generating a reset failure instruction; when the analysis result is allowed, a reset confirmation signal is generated; executing a reset activation operation, and recording the change of the running state parameters of the charging pile; dynamically monitoring the operation state parameters of the charging pile to form monitoring data; when abnormal state data is detected in the monitoring data, repeating the steps until the equipment is in a stable state or enters a manual intervention mode; the accuracy and the intelligent degree of sudden stop reset of the charging pile are improved.

The utility model relates to a connector, a wire harness structure and an electronic device, and the connector comprises a female head assembly which comprises a female sleeve body and a clamping part disposed on the peripheral wall of the female sleeve body; the male head assembly comprises a male sleeve body used for being matched with the female sleeve body in an inserted mode and a locking part arranged on the peripheral wall of the male sleeve body. Wherein the locking part can be guided into the clamping part in a sliding mode under the driving of the male sleeve body, so that the locking part is matched with the clamping part in a locking mode, and the clamping part can rotate under the driving of the female sleeve body so as to be separated from the locking part in an unlocking mode. The connector is simple to operate and convenient to use, a user can stably connect the female head assembly and the male head assembly of the connector through simple operation, the connection stability of the female head assembly and the male head assembly of the connector is ensured, the female head assembly and the male head assembly are prevented from being separated by external force in the use process of the connector, and the service life of the connector is prolonged. And the female head assembly and the male head assembly of the connector can be easily disconnected and separated, so that the overall use convenience of the connector is improved.

The invention relates to the technical field of fabricated buildings, and provides a wallboard system easy to assemble and install, the wallboard system comprises a plurality of wallboard units, connecting assemblies and driving assemblies, and the connecting assemblies and the driving assemblies are arranged in one-to-one correspondence with the wallboard units; an inserting groove and a connecting groove are formed in each wallboard unit, and the inserting grooves and the connecting grooves are arranged in a manner of deviating from each other; each connecting assembly comprises a connecting strip and a connecting sliding block, the connecting strips are arranged on the sides, provided with the inserting grooves, of the wallboard units, the connecting sliding blocks are arranged away from the connecting strips and slidably connected to the wallboard units, each connecting sliding block comprises an inserting part, and the inserting parts can be inserted into the inserting grooves of the adjacent wallboard units. The connecting strips can be inserted into the connecting grooves of the adjacent wallboard units; when the connecting strips slide into the connecting grooves of the adjacent wallboard units, the driving assemblies can drive the inserting parts to slide into the inserting grooves of the adjacent wallboard units. According to the invention, the convenience of wallboard assembly is further improved, and the flatness of the wall surface after assembly is also ensured.

The utility model provides a water drilling machine connector which comprises a main body connected with a water drilling machine, an expansion connector arranged at one end, connected with a drill bit, of the main body and capable of moving in the radial direction of the main body, a driving rod arranged on the main body and used for driving the expansion connector to move in the radial direction, and a water flow channel arranged in the driving rod. The main body is provided with a grip for driving the driving rod to move axially, the grip is in transmission fit with the driving rod through a transmission part, the expansion connector further comprises a positioning mechanism for positioning the expansion connector to be in an expansion state, and the positioning mechanism is arranged between the main body and the grip. The drill bit has the advantages that the positioning mechanism for positioning the expansion connector to be in the expansion state is arranged between the main body and the grip, so that the expansion connector can be stably kept in the expansion state, and the connection stability of the drill bit is ensured.

The invention discloses a dental implant fixator, and particularly relates to the technical field of dentistry, the dental implant fixator comprises an implant, an abutment and a connecting screw, the top of the implant is provided with a hexagonal hole, the abutment comprises a base body, the bottom of the base body is fixedly provided with a hexagonal block, the bottom of the hexagonal block is inserted into the hexagonal hole, and the connecting screw is connected with the hexagonal hole. And the connecting screw penetrates through the abutment and is in threaded connection with the implant. According to the dental implant fixator disclosed by the invention, the implant and the abutment are locked together in the mounting process of the connecting screw through the arranged anti-falling device, the implant and the abutment are prevented from loosening under the dual locking matching of the anti-falling component of the connecting screw, and meanwhile, the implant and the abutment are prevented from loosening due to the loosening of the connecting screw. The anti-loosening assembly is arranged outside the connecting screw, and the tooth socket matched with the anti-loosening assembly is arranged inside the implant, so that the connecting screw is prevented from loosening, and the connection stability between the abutment and the implant is further ensured.

The invention discloses a large-air-volume ammonia gas decomposition hydrogen production purification device, and relates to the technical field of ammonia gas hydrogen production. Through the arrangement of an auxiliary sealing replacement mechanism, when a large amount of ammonia gas is subjected to hydrogen production purification, power is generated through circulation of airflow to blow a fan to rotate, then rotation of the fan is converted into centrifugal force, an arc-shaped sliding block is pushed to abut against a through hole, and therefore when hydrogen production purification work is carried out, the connection stability of a drawing plate and a purification device is guaranteed; furthermore, under the action of a sealing rubber ring arranged on the periphery of the drawing plate, the sealing performance and the stability of the auxiliary connection are guaranteed during the purification operation of hydrogen production through large-air-volume ammonia gas decomposition, and the situation that poisonous gas in decomposed gas leaks and hurts workers is avoided; and due to the implementation of the structure, further fastening is achieved under the flowing of the air flow, and the situation of loosening is avoided.

The embodiment of the invention provides an applicator, an applying device and an applying set, and relates to the field of medical instruments. The applicator comprises a shell and a pressing structure, a container containing cavity is formed in the shell and can contain at least two containers, a pressing hole penetrates through the shell and communicates with the container containing cavity, the pressing structure comprises a pressing piece and a crushing piece which are connected, the pressing piece is movably connected with the shell, and the crushing piece is movably connected with the shell. The pressing piece is used for driving the crushing piece to penetrate through the pressing hole to directly act on the surface of the container under the action of external force, so that the crushing piece crushes the container, liquid in the container flows out and reaches the smearing cotton, and then subsequent smearing work is conducted. In the using process, the pressing structure can directly act on the surface of the container, the container can be crushed through small force, and more labor is saved in the using process.

The invention discloses an argon welding gun head capable of rapidly adjusting a needle, and relates to the technical field of argon welding guns. By rotating the insulating shell, the second sliding bin, the sliding bin cover cap and the first sliding bin can rotate, so that the tungsten needle clamp can move in the connecting shell in the axial direction, the tungsten needle can be pushed to stretch out and draw back, the purpose of adjusting different positions can be achieved, the welding precision is high, operation is easy, and the welding efficiency is high. A large amount of time does not need to be consumed, and the working efficiency is effectively improved; all the parts are connected through threads, so that the connection stability of the device can be ensured, and the device is convenient to disassemble and is beneficial to combined installation.

The invention is suitable for the technical field of chip processing, and provides an integrated circuit chip packaging and film covering device which comprises a device frame, a sliding seat, a film covering frame, a packaging film, a reel, a conveying belt and a film covering disc and further comprises a rotating mechanism, an intermittent regulation and control mechanism, a guide mechanism and a film covering mechanism. The film covering mechanism comprises a pressing and covering assembly and a cutting assembly. According to the integrated circuit chip packaging and film covering device, the film covering mechanism is matched with the rotating mechanism, the film covering disc, the intermittent regulation and control mechanism and the guide mechanism, so that automatic packaging and film covering of the chip can be completed, and a packaging film on a track from the edge end of the chip to the center position of the chip can be effectively and fully pressed and covered; according to the invention, the connection stability of the packaging film and the chip is ensured, the packaging quality and the packaging efficiency of the chip are improved, the working efficiency and the practicability of the device are further improved, the packaging time of the chip is shortened, and the packaging cost of the chip is reduced.

An EMB braking system ball screw comprises a screw nut, a screw and balls, the screw nut and the screw are provided with a first channel and a second channel respectively, the first channel and the second channel are matched to form a channel allowing the balls to move therein, an assembly groove allowing the output end of a driving motor to be inserted therein is formed in the center of the screw, and the assembly groove is matched with the first channel and the second channel. A clamping groove matched with the output end of the driving motor is formed in the tail end of the assembling groove and used for being fixed to the output end of the driving motor and transmitting driving force provided by the driving motor to the lead screw. The beneficial effects of the utility model are that: firstly, because the clamping groove is arranged at the tail end of the assembling groove, the output end of the driving motor can be well covered by the assembling groove, so that the space occupied by the whole structure is reduced during use; and secondly, the lead screw is directly connected with the driving motor through the clamping groove, so that the driving force provided by the driving motor can directly act on the lead screw, and the transmission stability is effectively improved.

The utility model relates to the technical field of awning steel structures, and discloses a stadium stand awning steel structure which comprises a stand column and a supporting seat, the upper surface of the supporting seat is connected with a rotating handle, a connecting cylinder is installed at the bottom of the supporting seat, and an outer through hole is formed in the surface of the connecting cylinder. A conical insertion rod is connected to an inner cavity of the outer through hole, a rotating shaft is connected to an inner cavity of the connecting cylinder, a fan-shaped pressing plate is installed on the surface of the rotating shaft, arc-shaped side plates are additionally arranged on the two sides of the rotating shaft, and reset springs are arranged between the arc-shaped side plates and the conical insertion rod in a sleeving mode; and an outer connecting hole is formed in the inner wall of the fixed cylinder. According to the steel structure for the awning of the stadium stand, the fixed barrel is fixed to the stadium stand through cast-in-place fixing, the connecting barrel enters the fixed barrel, the rotating handle drives the rotating shaft, the fan-shaped pressing plate rotates along with the rotating shaft to extrude the arc-shaped side plate, and the arc-shaped side plate can drive the conical inserting rod to enter the interior of the outer connecting hole along the outer through hole for connection operation.

The utility model discloses a connecting structure of an H-shaped steel structure, which comprises a steel column and an H-shaped steel structure which are connected with each other, the steel column is vertically arranged, the H-shaped steel structure is horizontally arranged, the end part of the H-shaped steel structure is fixedly provided with a connecting plate through a first bolt, and the outside of the H-shaped steel structure is sleeved with a fixing sleeve in a sliding fit manner; the fixing sleeve is fixedly connected with the steel column through a second bolt, a containing groove is formed in the end of the fixing sleeve, and the connecting plate is partially extruded and fixed in a space jointly defined by the steel column and the containing groove. According to the connecting structure of the H-shaped steel structure, welding operation of a user is not needed, mounting and dismounting of the user are facilitated, cost is reduced, it is guaranteed that the H-shaped steel structure can be reused, meanwhile, the structural strength of the end of the H-shaped steel structure can be enhanced through the fixing sleeve, and connecting stability is high.

The utility model belongs to the technical field of building block toys, and particularly relates to a building block quick connection structure and a toy. The building block quick-connecting structure comprises a first connecting part and a second connecting part, an inserting hole is formed in the first connecting part, a plurality of guide convex ribs are arranged on the hole wall of the inserting hole in the circumferential direction, the extending direction of each guide convex rib is consistent with the hole axis direction of the inserting hole, and a first buckling structure is arranged on the inner wall of the inserting hole; the second connecting part is provided with an inserting rod, the outer side wall of the inserting rod is provided with a second buckling structure and a plurality of guide grooves distributed in the circumferential direction, the extending direction of each guide groove is consistent with the axis direction of the inserting rod, and the guide grooves and the guide convex ribs are arranged in a one-to-one correspondence mode; and the second buckling structure and the first buckling structure are mutually buckled so as to limit the inserting rod from being separated from the inserting hole. According to the technical scheme, the problems that when an existing toy of a building block splicing structure is assembled, the requirement for the operation flexibility of children is high, the assembling speed of the children is low, and the dislike mood of the children is likely to be caused are solved.

The utility model relates to the technical field of batteries, and provides a battery, which comprises a battery shell provided with a pole through hole; the battery cell is arranged in the battery shell; the battery core is electrically connected with the pole assembly, and the pole assembly is fixed on the battery shell by the first bending section and the second bending section; the plugging piece is arranged in the groove, and the plugging piece is connected with the pole assembly in a welding manner, so that a welding mark is formed on one side, deviating from the battery cell, of the plugging piece and / or the pole assembly; at least part of the insulating part is arranged between the pole assembly and the battery shell, the minimum vertical distance between the welding mark and the circumferential outer surface, facing the hole wall of the pole through hole, of the penetrating section is d, and d is larger than or equal to 0, so that the transfer distance of heat on the penetrating section in the welding process can be increased, the probability that the heat is transferred to the insulating part is reduced, and the welding quality of the battery is improved. Therefore, the insulating property and the sealing capability of the insulating part are ensured, and the safe use performance of the battery is improved.

The utility model discloses a via hole connector, which is used for installing a cable on electrical equipment, and comprises a rear cover sleeved on the cable; the connecting part is arranged on the cable in a sleeving manner and comprises an inner connecting body and an outer connecting body arranged on the inner connecting body in a sleeving manner, the outer connecting body comprises a first ring body, a second ring body and a third ring body which are coaxially arranged, a plurality of open grooves are formed in the first ring body, folded edges are arranged in the open grooves, the folded edges are arranged in an inclined manner, and the first ring body and the second ring body are coaxially arranged. A plurality of open holes are formed in the second ring body, a plurality of openings are formed in the third ring body, and the second ring body is gradually shrunk from the first ring body to one side of the second ring body; and the sealing ring is arranged between the rear cover and the connecting ring and is sleeved on the cable. According to the utility model, the light-weight design is adopted, the cost and the weight can be reduced, the cable can be prevented from falling off when being inserted, and the connection stability is ensured.

The utility model relates to the technical field of photoelectric connectors, in particular to a butt joint device of a photoelectric connector, which comprises a box body, the top of the box body is open, a double-end screw rod is rotatably mounted in the top opening of the box body, and connecting blocks are in threaded connection with threads at two ends of the double-end screw rod; clamping grooves are formed in the clamping blocks, the sliding rods are sleeved with second springs, and one ends of the second springs abut against the clamping blocks; the two connecting blocks can be driven to synchronously and relatively move by rotating the double-end lead screw, the connecting blocks can drive the two supports to synchronously and relatively move, when the two supports synchronously and relatively move, rapid butt joint of the two photoelectric connectors can be achieved, and under the elastic force effect of the second spring, the two photoelectric connectors can be connected in a butt joint mode. Therefore, the situation that the photoelectric connectors are separated due to pulling of external force is avoided, the connection stability of the photoelectric connectors after butt joint is guaranteed, and normal transmission of optical signals and the stability of a whole optical communication system are guaranteed.

The utility model discloses a structure capable of enabling a fan head to automatically shake left and right and simultaneously swing up and down, which is characterized in that one end of a left-right first rotating arm is vertically and fixedly connected with a rotor of a left-right shaking motor, and the other end of the left-right first rotating arm is rotatably connected with one end of a left-right second rotating arm in an overlapping manner; the rotating seat is fixedly installed in a connecting hole of the fixed seat and is rotatably connected with the supporting rotating shaft, the supporting rotating shaft is fixedly connected with the fan supporting rod, one end of the first up-down rotating arm is vertically and fixedly connected with a rotor of the up-down swing motor, and the other end of the first up-down rotating arm is rotatably connected with one end of the second up-down rotating arm in an overlapped mode; and the other end of the up-down second rotating arm is fixed on a rotating arm hole in the outer side of the fixed seat. The multi-angle automatic rotating air supply device achieves up-down and left-right multi-angle automatic rotating air supply, is large in air supply angle and wide in air supply range, is friendly to special users such as old people and children which cannot directly blow air, and can also be used in cooperation with household appliances such as air conditioners, humidifiers and purifiers.

The invention belongs to the technical field of building engineering, and discloses a fabricated building reverse construction method and a fabricated underground building. The fabricated building reverse construction method comprises the steps that S1, a plurality of prefabricated middle stand columns are connected through inter-column connecting structures, column end connecting structures are pre-buried at the ends of the prefabricated middle stand columns on the bottommost layer, and the prefabricated middle stand columns on the bottommost layer are connected with a cast-in-place pile reinforcement cage; s2, a pile hole is drilled to the designated depth, a cast-in-situ bored pile is poured to a cast-in-situ pile reinforcement cage to the bottom of the bottom plate structure, and the multiple prefabricated middle stand columns, the inter-column connecting structures between every two adjacent prefabricated middle stand columns, the column end connecting structures and the cast-in-situ bored pile are connected into an integrated supporting column structure; s3, side walls are constructed; s4, constructing a middle layer; s6, the step S5 is repeated until all the middle layers are constructed; and S7, a bottom layer is constructed. According to the fabricated underground building, prefabrication of building components is achieved, the construction time is greatly shortened, and the construction efficiency is improved.

The invention relates to the field of bed sheet production, and particularly discloses a bed sheet production winding device which comprises a base, two symmetrically-arranged supports are arranged on the upper side of the base, a winding roller is detachably connected between the two supports, a through groove penetrating through the peripheral wall of the winding roller is formed in the peripheral wall of the winding roller, and a leveling rod abutting against the periphery of the winding roller is arranged on the lower side of the winding roller. Connecting seats are rotationally connected to the two ends of the leveling rod, damping rods are fixed between the connecting seats and the base, and a through groove is formed in the peripheral wall of the winding roller, so that one end of the bed sheet cloth can penetrate through the through groove, the bed sheet cloth and the winding roller are fixed conveniently, and the connection firmness between the cloth and the winding roller is ensured when the winding roller winds the cloth; when the bed sheet cloth is rolled to a certain diameter, the cloth abuts against the cutting knife, the cloth is cut off through the cutting knife, it is ensured that the rolling length of the cloth is consistent when the cloth is cut off every time, meanwhile, the height of the cutting knife can be adjusted under rotation of the threaded rod, and therefore the diameter of the cloth after rolling is completed is adjusted.

The invention relates to the technical field of bolt connection, and particularly discloses a high-strength bolt connection pair which comprises an outer screw rod and outer threads arranged at the bottom of the outer screw rod, the outer screw rod is sleeved with a first gasket and a second gasket, and the bottom of the outer screw rod is sleeved with a screw cap. The inner wall of the screw cap is provided with a first inner screw groove which is matched and screwed with the outer screw teeth, the top of the screw cap is movably connected with a connecting ring, the inner wall of the connecting ring is provided with two symmetrical positioning grooves, and the middle position of the bottom of the outer screw rod is provided with a second inner screw groove. Double screw joint fixation is formed, the connecting stability of the screw cap and the outer screw rod is guaranteed, a structure for preventing the screw cap from loosening is arranged, the problem that the screw cap rotates due to vibration is solved, the fastening effect of the whole bolt connecting pair is fully improved, the permanent fixing performance is guaranteed, the screw joint area is completely covered with the screw cap, and the screw joint effect is improved. And the problems of corrosion and the like caused by environmental influence due to long-time exposure of the screw joint part are avoided.