35results about How to "Avoid reverse rotation" patented technology

The utility model belongs to the technical field of thermal power plants, and particularly relates to a thermal power plant EH oil system high-pressure explosion-proof connector which comprises a transmission pipe and a connecting bolt installed on one side of the transmission pipe, a positioning clamp is installed on one side of the connecting bolt, an anti-disengaging block is arranged at one end of the positioning clamp and connected with a clamping ring, and the clamping ring is connected with the transmission pipe. According to the device, the transmission pipe and the connecting base can be rapidly connected through rotation between the connecting bolt and the mounting nozzle, and meanwhile, under pushing of the connecting bolt, connection between the positioning clamp and the clamping ring and connection between the anti-disengaging block and the clamping ring can be further driven; and after the connecting bolt and the mounting nozzle are connected, reverse rotation between the connecting bolt and the mounting nozzle can be avoided, so that loosening and even loosening between the connecting bolt and the mounting nozzle can be prevented, and stable and effective guarantee can be provided for production safety.

This utility model discloses a folding cabinet, which includes a front panel, a rear panel, a top panel, a bottom panel, a top stopper, a bottom stopper, and a foldable side panel in the middle. One side panel is rotatably mounted on one side of the front panel and one side of the rear panel, respectively, and the other side panel is rotatably mounted on the other side of the front panel and the other side of the rear panel, respectively. The top stopper is disposed on one of the top of the front panel and the top of the rear panel. The pivot side of the top panel is rotatably mounted on the other of the top of the front panel and the top of the rear panel, and the free side of the top panel can be blocked by the top stopper. The bottom stopper is disposed on one of the bottom of the front panel and the bottom of the rear panel. The pivot side of the bottom panel is rotatably mounted on the other of the bottom of the front panel and the bottom of the rear panel, and the free side of the bottom panel can be blocked by the bottom stopper.

The utility model discloses an elastic reset type motor positive and negative rotation brake device, which relates to the technical field of motor control, and comprises a fixed shell and two brake pads, two limiting plates and two limiting rings are connected in the fixed shell in a sliding manner, two ends of each limiting plate are fixedly connected with the adjacent limiting rings, and the two ends of each limiting plate are fixedly connected with the corresponding brake pad. Two limiting rods are fixedly connected between the inner walls of the limiting ring, penetrate through the brake pad and are in sliding connection with the brake pad; a motor shaft body; according to the brake device, the first electric push rod is started to drive one of the clamping rings to be clamped with the positioning ring, and the clamped spring is replaced by starting the first electric push rod before the motor shaft body brakes, so that the spring is driven to contract to drive the brake pad to clamp and decelerate the motor shaft body, and brake resistance can be provided when the motor slides down in a power failure; when the motor slides down due to insufficient torsion, the motor shaft generates frictional resistance to prevent the motor shaft from rotating reversely.

The utility model relates to the field of railway platform protection equipment, in particular to a rope winding tensioning mechanism which comprises a rope winding base and a passenger intercepting rope, a passenger intercepting rope leading-in device and a rope pressing device are respectively arranged on the rope winding base, and the rope pressing device is rotatably arranged on the rope winding base. The passenger intercepting rope penetrates through the passenger intercepting rope leading-in device to enter the rope winding base and then is fixed on the rope pressing device; the rope winding base is provided with a rope winding anti-skid device used for preventing the rope pressing device from reversely rotating in a non-control state, according to the rope winding tensioning mechanism, the passenger intercepting rope is conveniently guided into the rope winding base through the arrangement of the passenger intercepting rope guiding-in device, the rope pressing device can press and fix the passenger intercepting rope, and the rope winding anti-skid device is used for preventing the rope pressing device from reversely rotating in the non-control state. When the rope pressing device rotates, the passenger intercepting rope can be wound, and the rope winding anti-skid device is arranged, so that the situation that the rope pressing device rotates reversely can be avoided.

The utility model relates to the technical field of winch lifting devices, and discloses a safety type double-output winch lifting device which comprises a bottom plate, a plurality of fixing plates are fixedly connected to the side face of the bottom plate, first shells are fixedly connected to the side faces of the two fixing plates, and driving assemblies are arranged on the inner sides of the two first shells. Second shells are fixedly connected to the side faces of the other two fixing plates, clamping assemblies are arranged on the inner sides of the second shells, a plurality of supporting plates are fixedly connected to the side face of the bottom plate, and reciprocating limiting assemblies are arranged on the side faces of the two supporting plates. According to the rope limiting device, the sliding groove lead screw is matched with the limiting rod, the limiting block can move in the direction of the limiting rod, the clamping block moves on the surface of the sliding groove lead screw along with the limiting block, meanwhile, height adjustment of the limiting ring is achieved through the hole shell and the hole plate through the fixing bolt, and therefore the rope is accurately limited. The position of the clamping block on the sliding groove lead screw can be accurately controlled through a groove in the surface of the sliding groove lead screw.

The utility model relates to the technical field of clamps, in particular to a quick-opening clamp structure of a miniature reaction kettle. The kettle comprises a quick clamping assembly, a kettle body and a kettle cover are connected through the quick clamping assembly, and an anti-loosening assembly and a fixing assembly are arranged on the quick clamping assembly. Through the design of the quick clamping assembly, the kettle body and the kettle cover are extremely simple, convenient and quick to connect and disassemble, the left half lantern ring shell and the right half lantern ring shell are connected through the first rotating shaft, an operator only needs to manually rotate the right half lantern ring shell to realize opening and closing of the lantern ring, and compared with a traditional complex connecting mode, the connecting structure has the advantages that the structure is simple and convenient; the operation time and the labor cost are greatly saved, and the working efficiency can be remarkably improved especially in an experiment or production scene where the reaction kettle needs to be frequently opened and closed.

The utility model provides a battery pack air tightness detection tool, which comprises a base and a pressing assembly arranged above the base, an accommodating space for accommodating a battery pack is formed between the base and the pressing assembly, the pressing assembly comprises a support frame arranged on the base in an up-and-down sliding manner, and the support frame is arranged on the base in an up-and-down sliding manner. The supporting frame is arranged on the base, the mounting plates are arranged on the supporting frame and arranged in the length direction of the base at intervals, each mounting plate is in threaded connection with a plurality of screw rods, the screw rods on each mounting plate are arranged in the width direction of the base at intervals, and one end of each screw rod extends into the containing space and can press the top of the battery pack. The battery pack air tightness detection tool is simple in design structure and can adapt to battery packs of different sizes, and a detection tool does not need to be independently designed for each type of battery pack.

The utility model belongs to the technical field of petroleum drilling and production mechanical equipment, and discloses a vertical transmission chain box with a novel structure. The input shaft and the output shaft are arranged in parallel, and the chain is in vertical transmission. A push disc clutch is installed at the end of a chain box input shaft assembly, an inner gear ring is designed to be connected with a clutch friction disc, meanwhile, a connecting disc is designed to be connected with the inner gear ring and a chain wheel, and rolling bearings are arranged inside and outside the chain wheel. A friction hub is designed at the end of the output shaft, and a pneumatic tire clutch and a connecting disc are installed outside the friction hub to serve as a reaction torque releasing device. According to the chain box, independent hanging or separation can be achieved through power, and abrasion and equipment loss caused by idle running of the chain are avoided. Meanwhile, the anti-torque release device arranged on the output shaft can release the deformation energy of the drill rod, the drill rod cannot rapidly and reversely rotate, and the safety performance of petroleum drilling equipment is greatly improved.

The utility model relates to the technical field of automobile fasteners, and discloses an automobile fastener with an anti-loosening structure, which comprises a shell and a bolt, and the anti-loosening mechanism is fixedly mounted on the inner wall of the shell; the anti-loosening mechanism comprises a mounting sleeve, the side face of the mounting sleeve is fixedly connected with the inner wall of the shell, and a sliding groove is fixedly formed in the inner wall of the mounting sleeve. The limiting block is aligned with the limiting groove, the bolt is inserted into the limiting groove, the bolt is connected with an automobile installation position through the wrench, the limiting block abuts against the limiting groove when the bolt rotates, the rotor and the sliding ring are driven to rotate, then the ratchet wheel is driven to rotate, and after the bolt and the nut are fastened and connected, the connecting rod is further driven to rotate through rotation of the wrench. And then the shifting block installed on the side face of the connecting rod is driven to deflect, then the clamping block is driven to deflect, the abutting direction of the clamping block and the ratchet wheel is changed, limiting is conducted through the reset spring, the situation that the bolt is loosened due to rotation of the bolt caused by vibration is prevented, and the anti-loosening performance of the bolt is improved.

The rotation stopping mechanism comprises a large gear and a tray, the tray is rotationally connected with a shell, a groove is formed in the center of the large gear, the tray is embedded into the groove, a resistance rotation stopping part is arranged on the side wall of the groove, a first pawl is arranged on the side wall of the tray, and a second pawl is arranged on the side wall of the first pawl. And the first pawl is in contact with the resistance rotation stopping part. Compared with the prior art, the first pawl and the resistance rotation stopping part are matched with each other, the tray can drive the large gear to rotate together when supplying a film belt in a rotating mode, the small gear is driven to rotate through the transmission gear, the small gear rotates to wind the film belt, the structure is simpler, the tray and the large gear are matched more firmly, and the film belt can be wound more stably. And disassembly and assembly are more convenient and faster.

The utility model provides a kind of anti-loose nut for building belongs to nut technical field.It solves the problem that existing nut bolt connection is easy to loosen.The anti-loose nut for building, including the nut body with threaded hole in middle part and the gasket with through hole in middle part, gasket is the open gasket with opening, nut body and gasket between being equipped with when the width of opening is used to make the retraction structure smaller when both coaxial relative movement, nut body and gasket between still being equipped with ratchet and pawl structure.Gasket is open gasket, when nut body and gasket coaxial relative movement, guide cone hole can make gasket hug tightly screw rod, realize axial positioning, simultaneously through the ratchet and pawl structure of being set can prevent nut body reverse rotation, anti-loose effect is good, stable and reliable, and it has advantages such as reasonable structure design, easy to process, low manufacturing cost.

The utility model discloses a sectional type bolt fastening device with a self-locking function, which is applied to the field of bolt fastening devices and comprises a bolt head, a connecting rod is integrally formed on the surface of the bolt head, and a screw is arranged at one end of the connecting rod. The clamping block is clamped with the ratchet wheel under the action of the spring, so that the ratchet wheel rotates unidirectionally, the nut rotates unidirectionally due to the unidirectional rotation of the ratchet wheel, after the nut is fastened in place, the clamping block is clamped with the ratchet wheel, and the nut is prevented from rotating reversely, so that the purpose of having a self-locking function can be achieved, the stability of the fastener is ensured, and the safety is improved; according to the utility model, the second bolt is loosened by using a tool, the insertion rod is pulled out from the insertion hole, then the connecting rod with the required length is inserted into the insertion rod, the second bolt is mounted and tightened, and the second bolt is fixed, so that the purpose of adjusting the length can be achieved, the use cost is reduced, and the practicability and the applicability are improved.

The application provides a multi-point sampling device for lake water quality inspection, and relates to the field of environmental monitoring, which comprises a winding mechanism, a cable rope, a plurality of sampling units arranged at intervals along the cable rope, and a control component, the winding mechanism is used for winding and unwinding the cable rope; each sampling unit comprises a sampling bottle and a solenoid valve arranged on the sampling bottle; a positioning assembly is detachably connected to the outer wall of the cable rope, and the sampling bottle is detachably installed in the positioning assembly; the control component is arranged on the winding mechanism and is used for controlling the opening and closing of the solenoid valves of the plurality of sampling units. The application solves the problem of few sampling points in the prior art by arranging the plurality of sampling units at intervals, and can simultaneously collect water samples at different depths; the depth sensor detects the depth in real time, the controller controls the opening and closing of the solenoid valve according to the preset depth, ensures the accuracy of the sampling depth, avoids the error of manual operation, and improves the reliability of the monitoring data; the limiting assembly prevents the reverse rotation of the winding wheel, and ensures the stability of the winding and unwinding of the cable rope.

The utility model discloses an ancient building transformation steel structure reinforcing unit, which relates to the technical field of building construction, and comprises an original wall body and a steel column positioned on one side of the original wall body, a reinforcing layer is arranged between the original wall body and the steel column, and the reinforcing layer is attached to the right end surface of the original wall body. A reinforcing unit is arranged on the surface of the end, away from the original wall body, of the reinforcing layer, a fastening mechanism is inserted into the reinforcing unit in a penetrating mode, the bottom of the steel column is connected with a steel column foundation, and the top of the steel column is connected with a steel beam. According to the utility model, a series of structures are arranged, so that the service life is greatly prolonged, the compression-resistant and shock-resistant bearing capacity is ensured, and the locking assembly is utilized, so that the situation of structure looseness cannot occur subsequently.

The utility model discloses a kind of cable storage mechanisms for multi-line charging pile, apply in charging pile field, including shell, the inner wall rotation sleeve joint of shell is provided with winding drum, winding drum and the surface between shell is provided with anti-reverse mechanism;The utility model is through when storage, rotates rotating head and makes screw rod drive ratchet block and ratchet wheel to separate, winding drum rotates rod under the action of coil spring, winding drum rotates and is reeled to cable, after winding is completed, charging gun is inserted into charging pile, to reach the purpose of easy storage, reduce workload, improve practicality, facilitate use, the utility model is through when pulling out cable, ratchet block cooperates with ratchet wheel under the action of spring, prevent winding drum reverse rotation, to prevent cable retraction, facilitate charging, improve practicality, by loosening fixed nut, rotating adjusting shaft, the torsion of coil spring can be adjusted, improve service life and stability.

The utility model relates to medical instrument technical field discloses obstetrical and gynecological pregnant woman leg support adjusting frame, including medical bed, the outer wall left side of medical bed is provided with lifting mechanism, the lifting mechanism is used for lifting, the outer wall left side of medical bed is provided with adjusting mechanism, the adjusting mechanism is used for adjusting the distance of support block, the lifting mechanism includes fixed block no.

This utility model discloses an adaptive mechanical gripper, belonging to the technical field of mechanical automation. It includes a first support plate, a drive mechanism, and a clamping mechanism. The drive mechanism is mounted on the first support plate, and the clamping mechanism is mounted below the first support plate. The drive mechanism includes a linkage assembly, a rotating shaft rotatably mounted on the first support plate, and a one-way locking member mounted on the first support plate, with the one-way locking member engaging with a first end of the rotating shaft. The first end of the linkage assembly engages with a second end of the rotating shaft, and the second end of the linkage assembly engages with the clamping mechanism. Under the action of the rotating shaft, the linkage assembly has a first moving position and a second moving position. In the first moving position, the clamping mechanism is in a clamping state; in the second moving position, the clamping mechanism is in a released state. The one-way locking member prevents the rotating shaft from rotating in the opposite direction, enabling the clamping mechanism to form a relatively balanced holding force. The clamping mechanism can be adjusted according to the size and weight of the workpiece, improving its stability.

The utility model discloses a rotary locking type filter bag fixing structure which comprises a filter cartridge, a filter basket is arranged in the filter cartridge, and a filter bag is sleeved in the filter basket; a circle of bearing table is arranged on the inner side of the top of the filter basket, a plurality of openings distributed at intervals are formed in the upper portion of the bearing table, a communicated pressing opening is formed in one side of each opening, and a sealing gasket is arranged in each pressing opening; a reinforcing ring is installed on the bearing table, pressing elastic pieces in one-to-one correspondence with the openings are arranged on the edge of the outer side of the reinforcing ring, and the pressing elastic pieces can enter from the openings and rotate along the pressing openings to be tightly attached to the sealing gasket so as to clamp and fix the filter bag; a plurality of positioning stand columns are arranged on the top face of the reinforcing ring, a cover pressing plate is further installed on the filter basket in a pressing mode, a plurality of positioning holes corresponding to the positioning stand columns in a one-to-one mode are formed in the cover pressing plate, and the cover pressing plate is detachably connected with the filter cylinder. The filter bag is easy and convenient to install, the filter bag cannot fall off, the overall sealing performance is good, and looseness cannot be generated.

The utility model discloses a clamping base chassis structure for crawler-type drill carriage transportation, and relates to the field of crawler-type drill carriage transportation supporting, the clamping base chassis structure comprises a crawler-type drill carriage, winding mechanisms are symmetrically arranged at the bottom of the crawler-type drill carriage, and a locking mechanism is arranged on one side of each winding mechanism; a winding mechanism; comprising a gear box fixedly installed at the bottom of the crawler drill carriage, transmission shafts are arranged on the two sides of the gear box, and limiting plates are installed on the opposite sides of the bottom of the crawler drill carriage. Due to the effect of the winding mechanism, the crawler drill carriage can be stabilized on the transport vehicle, displacement and damage caused in the crawler drill carriage transporting process are prevented, the hook on the front side of the bottom of the crawler drill carriage is hung at the firm position of the transport vehicle, and the position faces the center of the crawler drill carriage, so that the crawler drill carriage is prevented from being damaged. And then the other hook is hung on a firm part at the rear end of the transport vehicle, and the rope is tensioned under the winding action of the winding drum, so that the crawler drill carriage is stabilized on the transport vehicle and is convenient to transport.

The utility model relates to the technical field of pigging valves, in particular to an extensible pigging valve and pressure regulating valve combined device, which comprises a pigging valve main body, a mounting ring seat, a support frame, a connecting piece, a regulating piece and a locking mechanism, one end of the pigging valve main body is connected with a pressure regulating valve; the mounting ring seat is communicated with the pigging valve main body; a quick release cover is arranged in the mounting ring seat and is used for sealing the pigging valve main body; the support frame is arranged on the mounting ring seat, and one end of the support frame is connected with the quick release cover; the connecting piece part is arranged on the mounting ring seat; the adjusting piece is arranged on the supporting frame, and one end of the adjusting piece is connected with the quick release cover; the locking mechanism is arranged on the adjusting piece and used for preventing the quick-release cover from loosening. According to the pipeline pigging valve, the adjusting piece and the locking mechanism are arranged in a matched mode, the limiting pawl is attached to the ratchets of the limiting ratchet wheel under the action of the attaching spring, reverse rotation of the quick-release cover is avoided, and then sealing between the quick-release cover and the pipeline pigging valve body is guaranteed.

The utility model discloses an electric motor car car light sealing structure belongs to electric motor car car light technical field, this electric motor car car light sealing structure includes installation shell and protective lamp shade, the inside of installation shell is provided with circuit board and lamp pearl, one side of installation shell is installed with the connecting shell, the outer wall of connecting shell is provided with outer thread and sealing strip, the inner wall cooperation of protective lamp shade is provided with inner thread, the upper end cooperation of connecting shell is installed with the reinforcing mechanism of protective lamp shade, the inner wall of one side of protective lamp shade close to connecting shell is provided with sealing groove, the inner wall cooperation of sealing groove is provided with second sealing strip with sealing strip. The device carries out the preliminary thread connection through protective lamp shade cooperation connecting shell, can further reinforce protective lamp shade through reinforcing mechanism, and the fixed effect is better, and the installation and dismounting are convenient and quick simultaneously, can save certain time.

The utility model discloses a kind of assembled energy-saving building curtain walls, specifically related to curtain wall technical field, including installation frame, the side of installation frame is equipped with mounting rod, the inside center of installation frame is equipped with baffle, the both sides wall of mounting rod is fixedly connected with clamping block;The center of installation frame is equipped with rectangular hole, the top and bottom of installation frame are equipped with fixed groove, the both sides of installation frame and the position corresponding with clamping block are equipped with clamping groove;The inside center of mounting rod is penetrated with screw rod, and the top of screw rod is fixedly connected with knob;The bottom of clamping block is provided with extruded plate, and the side edge of clamping block away from mounting rod is fixedly connected with rubber sheet.The utility model has the advantages of convenient assembly, avoid loosening, convenient for adjusting illumination, more environmental protection.

The utility model discloses a synchronously-controlled multi-shaft tightening device, and relates to the technical field of mechanical disassembly and assembly. The bolt driving device comprises a gear transmission assembly, a first bolt driving assembly is arranged at the front end of the gear transmission assembly, the first bolt driving assembly comprises a first base, the first base is evenly and fixedly installed at the front end of the gear transmission assembly, and a first driving shaft is rotationally connected to the interior of the first base, penetrates through the first base and extends forwards. The first sleeve is connected to the front side of the first driving shaft in a sleeving mode, and the first spring is fixedly connected between the rear end of the first sleeve and the outer wall of the rear side of the first driving shaft. The multi-shaft screw-out and screw-up device can drive multiple shafts to rotate at the same time to achieve screw-out and screw-up of a bolt, the torque is kept uniform, the product quality is improved, the phenomena that due to misoperation, excessive screw-up is caused during disassembly, the bolt cannot be screwed in during assembly, and the bolt slips and falls off are avoided, stable disassembly and assembly are guaranteed, and the production efficiency is improved. And meanwhile, the wrench head can be aligned with the bolt for cap recognition, so that the working efficiency is improved.

The utility model provides a bicycle crank quick-assembly structure which comprises a connecting shaft arranged at one end of a crank, an assembling hole extending in the axial direction is formed in the connecting shaft, a positioning hole communicated with the assembling hole in the radial direction is formed in the side wall of the connecting shaft, a positioning pin is assembled in the positioning hole in a sliding mode, and a rotating sleeve capable of rotating is arranged outside the connecting shaft in a sleeved mode. The outer end of the positioning pin is in linkage fit with the inner wall of the rotating sleeve, the positioning pin can be driven to move inwards and outwards in the positioning space by rotating the rotating sleeve, and when one end of the middle shaft is inserted into the assembling hole, the positioning pin can be driven to move inwards by rotating the rotating sleeve so as to abut against and limit the outer wall of the middle shaft; during unlocking, the positioning pin can be driven to move outwards by reversely rotating the rotating sleeve. According to the quick assembling structure of the bicycle crank, a user can quickly assemble and disassemble the crank and the middle shaft without any work, and the experience feeling of the user is improved.

The utility model discloses a drawing type phase-to-phase spacer assembly comprising a spacer body, the left end and the right end of the spacer body are respectively connected with a control steering engine, the left end and the right end of the spacer body are respectively fixed with an L-shaped connecting piece, the upper side of the connecting piece is detachably connected with a fixed cover, and an electric wrench is fixed on the fixed cover. The lower ends of the connecting pieces are slidably connected with moving blocks respectively, fixed blocks are fixed to the outer sides of the connecting pieces respectively, folded edges are arranged on the outer sides of the fixed blocks respectively, insulating gaskets are fixed to the opposite sides of the fixed blocks and the moving blocks respectively, threaded rods are rotationally connected to the connecting pieces and are in transmission connection with the moving blocks, and sliding grooves are symmetrically formed in the inner sides of the connecting pieces. A fixed ring is fixed to the threaded rod, a plurality of arc-shaped movable blocks are rotationally connected to the fixed ring, the movable blocks are driven to move through the threaded rod, the movable blocks and the fixed block can be conveniently matched to clamp a cable, and the phenomenon that the movable blocks slide down is prevented through clamping and fixing of the clamping blocks and the clamping blocks.

This invention relates to the field of electronic connector technology, specifically a multi-contact spring-loaded electromagnetic shielded connector, including a connector socket and a connector plug. Both the connector socket and connector plug have a connector for connecting cables on one side, and a connector ear is connected to one side of the connector. The connector plug has an upper and a lower locking seat that engages with the cable. Each of the upper and lower locking seats contains a half-body induction coil. When the upper and lower locking seats are engaged, the half-body induction coil forms a complete induction coil. A control chip electrically connected to the half-body induction coil is installed in the upper locking seat. Upper clamps are located at both ends of the upper locking seat, and lower clamps are located at both ends of the lower locking seat. This invention, through the complete induction coil formed by the upper and lower locking seats and the control chip, can sense changes in the electromagnetic environment in real time and analyze the connector's operating status.

The utility model discloses an auxiliary disassembly and assembly tool for a manhole cover of an automobile tank car, which is characterized in that a connecting arm 11 of the tool is connected with a pallet fork of a stacking machine 1 through a bolt, and a shaft 6 is fixed at an opening end of the connecting arm 11; one end of the support steel 2 is fixed with the middle part of the shaft, and a through hole is formed in the part close to the fixed end; the rectangular bolt 3 horizontally penetrates through the through hole and is movably connected with the support steel 2; the manual wrench 9 drives the manhole cover to rotate through a rigid system formed by the shaft, the supporting steel 2 and the rectangular bolt 3, and the inclination angle of the manhole cover is adjusted; the ratchet wrench 10 controls the shaft to rotate in one direction and is used for reversely locking rotation of the shaft after the inclination angle of the manhole cover is adjusted in place. The auxiliary dismounting device can realize auxiliary dismounting of manhole covers with different inclination angles of the tank car, and has the advantages of high safety, strong practicability, convenience in operation and the like.

The application discloses a protective gear with reverse rotation prevention function, which comprises a gear body and a protection assembly. The protection assembly comprises a protection ring plate, which is fixedly connected to the middle part of the front and back surfaces of the gear body. A rotating ring is rotatably connected to the inner wall of the protection ring plate. A driving cylinder is fixedly connected to the side of the rotating ring, which is away from the protection ring plate. A rotating circular groove is formed in the middle part of the gear body, which is through the front and back surfaces. A ratchet is fixedly connected in the rotating circular groove. The rotating circular groove in the gear body is protected by the protection ring plate. The gear body has the function of preventing reverse rotation. In many mechanical devices, such as airplanes, cars, ships and industrial equipment, the reverse rotation of the gear may cause serious safety accidents. The function of preventing reverse rotation can ensure the safety of these devices during operation and reduce the danger caused by the reverse rotation of the gear.

The invention provides a thread machining auxiliary assembly, and relates to the field of internal thread machining. One side of the hollow supporting frame is fixedly connected with a fixed clamping base through bolts, three supporting rods are arranged on the outer side of the fixed clamping base in a surrounding mode, and each supporting rod is connected with two parallel connecting rods. A transmission screw is installed in the fixed clamping base, one end of the transmission screw is connected with a movable part, and the movable part is connected to the outer portion of the fixed clamping base. One ends of the parallel connecting rods are connected with a clamping jaw, and the clamping jaw is connected with the two parallel connecting rods. Through cooperation of the fixed ratchet disc and the movable ratchet disc, the rotation locking effect on the transmission screw rod is achieved, reverse rotation of the transmission screw rod is prevented, the stability of the state of the transmission screw rod is guaranteed, the problem of looseness of a screw tap clamping part is effectively avoided, and the thread machining precision is guaranteed. The screw tap chuck solves the problem that when a traditional screw tap chuck carries out machining operation, the screw tap clamping portion is prone to loosening, and the thread machining precision is affected.

The application discloses a hidden folding screen door and window, which comprises a window frame, an inner flat-opening window sash installed in the window frame, a mounting box fixed to the inner side of the top of the mounting frame, a pull roller rotatably installed in the inner side of the top edge of the mounting box through a torsion spring embedded type, a winding rod connected to one end of the bevel gear transmission assembly, a limiting ring connected to the winding rod through a second ratchet wheel assembly, the limiting ring being arranged on the outer side of the winding rod, a positioning rod slidably installed in the limiting ring through a fourth spring, a push head arranged on the top of the limiting ring, a fixed roller installed at the bottom of the side cavity of the mounting frame through a bearing, and a gear connected to one end of the fixed roller. The hidden folding screen door and window can realize the unfolding and folding of the screen through the opening and closing of the window, avoid the long-term exposure of the screen to the outside to accumulate dust, and reduce the light blocking.