84results about How to "Reasonable installation location" patented technology

The invention discloses a seven-axis linkage numerical control abrasive belt grinding and polishing machine tool. The seven-axis linkage numerical control abrasive belt grinding and polishing machine tool mainly solves the problems that according to a vertical six-axis linkage abrasive belt grinding and polishing method in the prior art, asymmetrical margins on a curved face can not be stably removed and excessive cutting or insufficient cutting is easy to occur. The seven-axis linkage numerical control abrasive belt grinding and polishing machine tool comprises a rotation clamp, a top tip, a horizontal machine tool body, a pillar, a Y-direction motion device, a Z-direction motion device, an X-direction motion device, a B-direction rotation drive device and a grinding and polishing device, wherein the rotation clamp and the top tip are used for fixing a blade part. The Y-direction motion device drives the pillar to move linearly in the Y direction, the Z-direction motion device drives the pillar to move linearly in the Z direction and the X-direction motion device is used for fixing the top tip and driving the top tip to move linearly in the X direction. The B-direction rotation drive device is used for fixing the rotation clamp and driving the rotation clamp to achieve 360-degree rotation motion. The grinding and polishing device is installed on the horizontal machine tool body and on the position corresponding to the pillar. By means of the technical scheme, the objects of convenient construction, the high performance cost ratio and high precision are achieved and high utility value and popularization value are achieved.

The invention discloses an automatic recording instrument for static pressure pile construction and a static pressure pile construction device. The automatic recording instrument comprises a measuring unit and a data acquisition processing unit, wherein the measuring unit comprises a pile pressing force sensor and a pile pressing depth sensor; the data acquisition processing unit is provided with a main control module and a data acquisition module and an input and output module that are respectively connected into the main control module; the pile pressing force sensor and the pile pressing depth sensor are both connected into the data acquisition module; the pile pressing force sensor is installed in a hydraulic oil circuit of a hydraulic cylinder of a static pile pressing machine; the pile pressing depth sensor is installed on a support of the static pile pressing machine; and the outer periphery of a friction wheel is in contact and fit with a pile pressing platform. The automatic recording instrument for static pressure pile construction is convenient to install and suitable for working environments of high on-site dust concentration, oil pollution and the like. The measuring way that a roller rotates and moves is adopted, the structure is sturdy and durable and suitable for continuous operation, and the proper signal pulse width ensures sufficient pulse interval and anti-interference property.

The invention relates to an oil gas well down-hole fault diagnosis system and method. The diagnosis system is provided with a well drilling liquid inlet flow sensor, a well drilling liquid outlet flow sensor, a pressure sensor, a multi-channel signal collecting and sending device, a multi-channel signal receiving device and a computer system. The well drilling liquid inlet flow sensor is fixed on a ground manifold or a stand pipe. The well drilling liquid outlet flow sensor is fixed at a well drilling liquid backflow pipe or a mud ditch at a well opening of an oil gas well. The pressure sensor is arranged on the stand pipe. The multi-channel signal collecting and sending device is arranged on a drilling table of a well frame. Down-hole fault forecasting, locating and quantification diagnosis can be achieved, the accuracy and the identifying effect of fault diagnosis are greatly improved, changing of well drilling liquid flow and pressure is grasped timely and accurately, early-stage diagnosis of well leakage, well kicking and drilling rig washout is achieved, cost is low, mounting is convenient, a mounting position is reasonable, and the safety factor is high.

The invention relates to a compensated step-less bare weight automatic adjuster of truck with damping vibration attenuation, while the former brake system can not reduce the pressure of brake cylinder significantly. The invention uses the control part 14 and the compensate part 15 of sensing valve to assist the adjusting valve 12 to adjust the pressure of brake cylinder and reduce the pressure of wind cylinder. It can step-less adjust the pressure of brake cylinder from bare weight to heavy weight of truck, without changing the former brake system, to significantly reduce the pressure of brake cylinder. The invention comprises a damping spring recover function, a air damping vibration attenuation, and a brake pressure self-locking weight-detecting restrain disc 17, to completely eliminate the effect on detecting weight by vibration when driving, therefore, the working state of restrain disc and sensing valve will all the same when the truck is braked. The invention can effectively reduce the longitudinal impact and avoid accidence.

The invention discloses a distributed ultrasonic obstacle avoidance system and an obstacle avoidance method thereof. The obstacle avoidance system comprises a carrier, a processor, and a plurality of ultrasonic modules. The carrier is used for carrying the processor and the ultrasonic modules. The ultrasonic modules are arranged on the carrier, the emitting direction is outward, and the included angle between the emitting directions of every two adjacent modules is equal. The processor is used for calculating the detection distance of obstacles in all ultrasonic module directions and sending an obstacle avoidance instruction to the carrier. The system works according to the following steps: judging whether an obstacle is within a set obstacle avoidance range; judging whether the speed of the carrier in the obstacle direction is nonnegative; and if the speed of the carrier in the obstacle direction is nonnegative, randomly generating at least two paths not passing the obstacle range from the current position according to a preset step length, taking one step along the paths, and linearly marching towards the endpoint from the current point. The distributed ultrasonic obstacle avoidance system and the obstacle avoidance method are of low cost and high adaptability, and have great practical values.

The invention relates to the field of environmental protection equipment, in particular to an intelligent trash bin with a classification collection function. The intelligent trash bin comprises multiple outer shells, each outer shell is provided with a trash throwing-in door and a door opening device controlling the trash throwing-in door to be opened automatically, and a bin body used for storing trash is arranged in each outer shell; a weighing device is arranged at the bottom of each bin body; an operating device is arranged on a front panel of one of the outer shells, and a guiding device used for blocking a gap is arranged between each trash throwing-in door and the corresponding bin body; a bin body volume monitor is arranged in each outer shell. The intelligent trash bin with the classification collection function has the advantages that the bin bodies can be moved out of the outer shells and are convenient to clean and replace, and the space between the bin bodies and the outer shells are kept clean; a trash overflow alarming function is achieved, the weighing structure is reasonable, weighing is accurate, and the intelligent trash bin is convenient to use.

An electromagnetic short current protective mechanism for a breaker belongs to the technical field of low voltage electric appliances. The protective mechanism is characterized by comprising an iron core, an elastic element and a lock catch actuating device, wherein the iron core is used for being arranged on the upper part of one end along the length direction of an arc extinguish chamber shell of the breaker and is matched with an upper fixed contact arranged on the arc extinguish chamber shell; the elastic element is supported on the upper fixed contact; and the lock catch actuating device of a lock catch is used for actuating a breaker operating mechanism, and the lock catch actuating device is hinged on the arc extinguish chamber shell and is contacted with the elastic element. The protective mechanism has the advantages of having concise structure, saving space usage, improving operational reliability and stability of the breaker and ensuring personal safety and the safety of circuits and power equipment. Meanwhile, the protective mechanism guarantees the internal isolation level and has good processing safety particularly when a roof cover of the breaker is opened to perform maintenance or replace internal attachments.

The invention relates to the field of seabed immersed tunnel construction, in particular to a cooling method of mass concrete vibration. The method includes: a first air cooler is mounted on a top plate reinforcement cage, second air coolers are respectively mounted on two outer wall form boards, and the first air cooler and the second air coolers are communicated into a reinforcement cage form board through hoses. The method has the advantages that the air coolers are respectively mounted on the top plate reinforcement cage and the two outer walls, the air coolers are connected with the corrugated hoses communicated into the reinforcement cage, cold air is conveyed to lower vibration environment temperature, a cool vibration environment is provided to vibration workers, and vibration quality is increased; the method is simple in equipment, convenient in equipment mounting and demounting and high in cooling efficiency; meanwhile, the mounting positions of the air coolers are reasonable and effectively, the communicating positions of the corrugated hoses conveying the cold air are evenly distributed along the length of the reinforcement cage, evenly cooling inside the reinforcement cage is achieved, and smooth construction is guaranteed.

The invention discloses a monitoring device for pile hammering machine construction and a networked automatic monitoring and recording system for the pile hammering machine construction. The monitoring device for the pile hammering machine construction comprises a depth sensing unit and a data collecting and processing unit, wherein the depth sensing unit is used for collecting depths of piles, and the data collecting and processing unit is connected with the depth sensing unit. The networked automatic monitoring and recording system for the pile hammering machine construction comprises at least one monitoring device for the pile hammering machine construction and a systematic host machine which is connected with the at least one monitoring device for the pile hammering machine construction through a signal transmission device. The monitoring device for the pile hammering machine construction can automatically record data of sunken depths of the piles and hammering times in the sinking process of the piles in the process of the pile hammering machine construction. The networked automatic monitoring and recording system for the pile hammering machine construction can achieve real-time monitoring on a plurality of pile hammering machines and carry out data processing.

The invention discloses a rotary kiln in the field of aluminum-used anode production, and particularly relates to a carbon calcining rotary kiln which comprises a kiln body, a lining, a kiln head, a kiln tail, a secondary air supply system and a tertiary air supply system. The secondary air supply system comprises a secondary air fan, a front secondary air pipe and a rear secondary air pipe, the front secondary air pipe and the rear secondary air pipe comprise 3-6 air pipes respectively, the air pipes are circularly arranged on the kiln body equidistantly, the straight-line distance between each two adjacent air pipes is 1.2-1.5m, the tertiary air supply system is composed of a tertiary air fan, a front tertiary air pipe and a rear tertiary air pipe, the front tertiary air pipe and the rear tertiary air pipe are composed of 3-6 air pipes respectively, the air pipes are circularly arranged on the kiln body equidistantly, and the straight-line distance between each two adjacent air pipes is 1.2-1.5m. The carbon calcining rotary kiln is in favor of fully utilizing combustion of volatiles, maintaining a longer calcining zone and high temperature of the calcining zone and improving product quality of calcined coke, and energy consumption is lowered.

The invention discloses an automatic separating device for a medical injector, and belongs to the field of medical-apparatus-and-instrument auxiliary devices. The automatic separating device for the medical injector aims at mechanically separating waste injector needles, needle bolts and needle cylinders generated in working. A guiding rail of the automatic separating device is sequentially provided with a fixedly-arranged cutting device, a separating device fixed on the guiding rail through a rail wheel and a loading cart arranged on the guiding rail through walking wheels, wherein the back side of the separating device is connected with a stopping block through a reset spring, and the stopping block is fixedly installed. The automatic separating device is easy to operate, the injector only needs to be reasonably installed, a key is accurately operated, and separating can be automatically completed.

The invention provides a rear wheel drive structure of a hybrid power motorcycle and relates to the hybrid power motorcycle, in particular to a single-suspension and unilateral-shaft hybrid power pedal motorcycle rear wheel drive structure. A wheel hub and a wheel rim are integrally designed, a stator adopts split design, the unique advantage of a double-row angular contact bearing is utilized to make structure combination perfect. A hollow shaft located on one side does not bear the vertical load of a rear wheel itself, so that a triangular support is not adopted for supporting, energy-saving update and installation of motorcycles including a pedal motorcycle is promoted, and an ideal scheme is also provided for development of novel vehicle types. In addition, an original rear wheel hub brake is improved into a disc brake, so that the safety performance of vehicles is improved.

The invention discloses a passive type automobile fire automatic suppressing method and device. A container containing fire extinguishing agents is arranged in an automobile; a pressure valve is arranged at a fire extinguishing agent outlet of the container for the fire extinguishing agents, an outlet of the pressure valve communicates with a pressure storage hose in a linkage mode, and the pressure in the container is not larger than the pressure of the pressure storage hose; and when the interior of the automobile is on fire and burns, the pressure storage hose bursts, the fire extinguishingagents in the container are sprayed out under the pressure in the container for suppressing burning. The mounting position is reasonable, and damage to a system, environment pieces and passengers isavoided; damage of the used fire extinguishing agents to an engine and electrical parts of the automobile is avoided; and arrangement is convenient, a monitoring area is not limited basically, no power source is needed and thus reliability is high, and a fire origin can be automatically detected and suppressed timely during the fire initial period.

The invention provides a flexible interlink steel gate and a support opening / closing device thereof, which belongs to the technical field of hydraulic engineering. The flexible interlink steel gate mainly comprises a flat plate steel gate (1), a gate support hinge (2), a cylindrical rubber bag communicated (7) with a water supply / drainage system, a flange (6) at the upper part of the rubber bag, a connecting piece (8) at the lower part of the rubber bag, a bottom water stop (3), a side water stop (18), a door interlink, and the like. The steel gate is made of a steel panel and a light structural steel beam grid system through welding, adjacent gates can be connected through the water stops and the interlink fasteners, and one gate is connected with a bottom plate pre-embedded part (5) through a hinge, and is controlled to be opened or closed through the expansion and the retraction of the rubber bag which is filled with water or discharges water. The invention has the advantages that less central piers are used, water is not blocked, the gate has a light and thin body and can be controlled to be opened or closed by a person, the water filled and discharge amount is small, the cost of construction is low, and the use is convenient, so that the flexible interlink steel gate and the support opening / closing device thereof can be widely applied in mountainous area watercourses and small hydro-electric power plants.

The invention relates to an integrated swing-arm pedestal device enabling to make use of an integrated swing-arm pedestal to integrate a rear transverse pull-bar fulcrum pin, an absorber fulcrum pin, a rear swing-arm pedestal reinforced-plate, and a rear transverse pull-bar fulcrum pin bracket to form a whole, and the assembling method thereof. The integrated swing-arm pedestal device of the invention comprises an integrated swing-arm pedestal, wherein, the integrated swing-arm pedestal is provided with a rear transverse pull-bar fulcrum pin mounting hole, an absorber fulcrum pin mounting hole, and a rear transverse pull-bar fulcrum pin bracket mounting portion; the rear transverse pull-bar fulcrum pin bracket is fixed to the integrated swing-arm pedestal by the rear transverse pull-bar fulcrum pin; the integrated swing-arm pedestal, the rear transverse pull-bar fulcrum pin, the absorber fulcrum pin, the rear swing-arm pedestal reinforced-plate, and the rear transverse pull-bar fulcrum pin bracket are integrated by jointing to form a whole. According to the invention, the rear shaft has more centralized parts and the installation position of each part is more reasonable so that the function of each part can be achieved to the maximum extent; the whole device has simple assembly and reasonable design, thus considerably saving the installation space for the rear shaft.

The invention discloses a water tank mounting structure which comprises a water tank and a mounting seat. The water tank is slidably arranged in the mounting seat; a locking pop-up mechanism is arranged at the upper part of the mounting base, the locking pop-up mechanism stores force in the process of locking the water tank, releases force in the process of unlocking the water tank and provides pop-up power for the water tank; a connecting mechanism is arranged on the locking pop-up mechanism; the water tank can be connected with the connecting mechanism in the forward moving process; the water tank is separated from the connecting mechanism in the retreating process, the sliding stroke of the water tank in the containing cavity has a first stroke and a second stroke, the water tank is separated from the locking pop-up mechanism in the first stroke and moves independently, and the water tank is connected with the locking pop-up mechanism through the connecting mechanism in the second stroke and moves in cooperation with the locking pop-up mechanism. The locking mechanism and the pop-up mechanism are combined into a whole, the structure is simple and compact, the installation spaceis saved, the locking pop-up mechanism and the water tank are arranged separately, the water tank slides stably and smoothly, and the locking pop-up mechanism is not prone to damage.

The invention relates to a cashmere processing device, in particular to an oiling method and an oiling process of wool lubricant during the slivering process of cashmere. The device comprises a cashmere condensing device and a conveyor belt which is mounted below the cashmere condensing device and can move left and right, and the device is characterized in that wool lubricant spray heads are fixedly mounted at two ends of the conveyor belt, and the horizontal height of the wool lubricant spray heads is lower than that of the conveyor belt. The oil injection way of the wool lubricant spray heads is changed from the vertical way to the horizontal way, thereby simultaneously spraying the wool lubricant to two sides of raw material during the falling process of the raw material, realizing uniform oiling and simultaneously ensuring that the moisture regain of the raw material achieves 25%-30%; furthermore, as the spray heads are mounted below the conveyor belt, the sprayed wool lubricant can not pollute the conveyor belt, the cashmere sliver preparation rate can be improved by 2 percent on the existing basis, and the quality of cashmere slivers is further improved.

The invention provides a pesticide-spraying unmanned aerial vehicle framework structure. The pesticide-spraying unmanned aerial vehicle framework structure is convenient for an individual to maintainand assemble a pesticide box on a pesticide-spraying unmanned aerial vehicle; the invention designs a novel unmanned aerial vehicle framework with the pesticide box; the unmanned aerial vehicle framework with the pesticide box comprises an overall framework and the pesticide box, wherein the overall framework comprises an H-shaped framework body; transverse machine arms are arranged on the upper side and the lower side of the H-shaped framework body respectively; middle connecting components are mounted on the two sides of the H-shaped framework body respectively; inclined machine arms are arranged in two through pipes of each middle connecting component; the inclined machine arms and the transverse machine arms are connected through machine arm connecting components; a pesticide box holder is fixedly arranged at the middle part of the H-shaped framework body; the pesticide box is mounted on the pesticide box holder; the pesticide box comprises a box; an inlet of the pesticide box is formed in the top surface of the box; an outlet of the pesticide box is formed in the middle part of the box; the outlet is downwardly formed; a suction pipe is arranged inside the box; a filter is mounted at one end of the suction pipe; the filter is fixedly arranged at the bottom of the box; a stop valve is mounted at the other end of the suction pipe; and the stop valve is mounted at the outletin a sealed manner.

The invention discloses a top cover decoration strip installation buckle; a buckle body comprises a frame-shaped part; the frame-shaped part is rectangular; a separation plate is arranged in the frame-shaped part, and is provided with a positioning chute; an installation hole is formed in one end of the positioning chute; a limiting boss is arranged in the connected place of the installation hole and the positioning chute; a positioning piece is arranged outside a long edge at one side of the frame-shaped part; the two ends of the long frame of the frame-shaped part are both extended and provided with elastic legs; guide surfaces are arranged at the outer sides of the ends of the elastic legs; limiting pieces are arranged in middle of short borders at the two ends of the frame-shaped part; and a convex block is arranged at the end of the limiting piece. As opposite positions of rivets welded on the buckle body and a top cover are adjusted, the reasonability of installation position of the buckle body can be guaranteed, the relative error of the welding position of the rivet on the top cover is made up, a top cover decoration strip can be firmly fixed, and the installation adjustment is more convenient.

The invention discloses a rewinding roller for removing static electricity. The air expansion shaft and the transition roller can be rotatably connected to the support, and the meter counter can be slidably connected to the support through an adjustment rod. The adjustment rod is located above the transition roller. The meter counting wheel of the device is attached to the upper surface of the transition roller, and the meter counting wheel rotates with the rotation of the transition roller, and the static electricity removal device is detachably connected to the bracket. The invention has the advantages of simple operation, good static removal effect, adjustable static removal device, improved film quality, and reasonable installation position of the meter counter, which can be adjusted to improve measurement accuracy.

The invention belongs to the technical field of agricultural equipment, and provides a steering engagement and disengagement driving mechanism of a combine-harvester. The steering engagement and disengagement driving mechanism comprises an engagement and disengagement steering shaft, a steering main gear assembly, a steering gear assembly, a steering shifting fork assembly and a braking assembly, and a shaft seal assembly is arranged at the outer side end of the braking assembly and used for keeping the rotating position of the engagement and disengagement steering shaft and the fixed position of the braking assembly. The steering engagement and disengagement driving mechanism has the advantages that by means of the steering main gear and steering gear structure of the steering engagement and disengagement driving mechanism, good stability is achieved, the mounting position is precise and reliable, the clearance arrangement is reasonable, and walking and steering of the combine-harvester can be fast and stably achieved; according to the braking assembly, a plurality of alternately combined separation plates and friction plates cooperate, braking stability is good, the running speed of the combine-harvester on a smooth-riding surface is increased, the adaptability of the combine-harvester to complex field blocks is improved, and the cross-regional operation performance of the combine-harvester is greatly improved.

The invention relates to a material extravehicular exposure friction wheel movement mechanism and an optical space inspection device. The output shaft of a driving mechanism is fixedly provided with adriving friction wheel, and is rotationally provided with a driving pre-tightening base; one end of a driven pre-tightening base and the driving pre-tightening base are rotationally installed, and adriven friction wheel is rotationally installed at the other end of the driven pre-tightening base; a friction rod is clamped between the driving friction wheel and the driven friction wheel assemblyand is in friction fit with the driving friction wheel and the driven friction wheel; a pre-tightening spring is arranged between the driven pre-tightening base and the driving pre-tightening base ina clamped mode and generates pushing force on the driven pre-tightening base and the driving pre-tightening base, so that the driven pre-tightening base rotates around the driving pre-tightening baseand drives the driven friction wheel to press the friction rod, and the driving pre-tightening base drives the driving friction wheel to press the friction rod. The material extravehicular exposure friction wheel movement mechanism has self-adaptive capability and certain pre-tightening force, so that the material extravehicular exposure friction wheel movement mechanism has enough temperature difference adjustment space and has high environmental adaptability and reliability.

An electromagnetic short current protective mechanism for a breaker belongs to the technical field of low voltage electric appliances. The protective mechanism is characterized by comprising an iron core, an elastic element and a lock catch actuating device, wherein the iron core is used for being arranged on the upper part of one end along the length direction of an arc extinguish chamber shell of the breaker and is matched with an upper fixed contact arranged on the arc extinguish chamber shell; the elastic element is supported on the upper fixed contact; and the lock catch actuating deviceof a lock catch is used for actuating a breaker operating mechanism, and the lock catch actuating device is hinged on the arc extinguish chamber shell and is contacted with the elastic element. The protective mechanism has the advantages of having concise structure, saving space usage, improving operational reliability and stability of the breaker and ensuring personal safety and the safety of circuits and power equipment. Meanwhile, the protective mechanism guarantees the internal isolation level and has good processing safety particularly when a roof cover of the breaker is opened to performmaintenance or replace internal attachments.

The invention provides a light-controlled LED light supplement lamp. The light-controlled LED light supplement lamp comprises an LED lamp and a circuit control module, wherein the LED lamp is packaged in a front housing, and the circuit control module is packaged in a rear housing; a rear wall of the front housing and a front wall of the rear housing are connected through a supporting rod; the circuit control module comprises a light control circuit board and a photosensitive diode; the light control circuit board is electrically connected with the LED lamp; the photosensitive diode is electrically connected with the light control circuit board; the photosensitive diode is embedded in the outer side wall of the rear housing; and the top of the photosensitive diode extends out of the surface of the rear housing. The light-controlled LED light supplement lamp disclosed by the invention has the beneficial effects that the light supplement lamp is stable in current, low in power consumption, good in sealing and waterproof properties, and good in heat dispersion, so that the service life of the light-controlled LED light supplement lamp is greatly prolonged, and the cost of maintaining and repairing the light-controlled LED light supplement lamp is reduced.

The invention relates to a hydraulic type valve lift adjusting and buffering device for an internal combustion engine. The hydraulic type valve lift adjusting and buffering device for the internal combustion engine comprises a cam, a tappet set, a valve set and a rocker arm, wherein the tappet set is connected to the cam and comprises a lower tappet, an upper tappet and a tappet length adjustment unit located between the lower tappet and the upper tappet and used for adjusting the distance between the tappets, and the tappet length adjustment unit comprises a tappet cavity which is formed between the lower tappet and the upper tappet and contains hydraulic oil, a piston which can move leftwards and rightwards to adjust the height of the tappet cavity, and a second servo driving unit which enables the piston to move leftwards and rightwards; the valve set comprises a valve, a valve spring and a valve spring seat; one end of the rocker arm is connected to the valve set, and the other end of the rocker arm is connected to the tappet set; and the cam rotates to drive the tappets to move up and down, and accordingly the rocker arm is made to rotate to control opening and closing of the valve. According to the device provided by the invention, air input or air output can be changed freely according to actual requirements of combustion emission, and the overall performance of the internal combustion engine can be further improved.

The invention discloses a thread trimming and presser foot lifting mechanism of a sewing machine and the sewing machine comprising the thread trimming and presser foot lifting mechanism, and belongs to the technical field of sewing machines. The purpose of the mechanism is achieved by that a frame is provided with a presser foot lifting mechanism and a thread cutting mechanism, a driving motor isarranged in the middle of the side surface of the frame, a motor shaft extends into the frame and drives the thread cutting mechanism and the presser foot lifting mechanism respectively, the upper side of a cam is provided with a presser foot lifting swing rod, and the lower side of the cam is provided with a thread cutting swing rod; the fixed end of the presser foot lifting swing rod is hinged to a bracket, the movable end of the presser foot lifting swing rod is hinged to the end of an upper push rod, the other end of the presser foot lifting swing rod drives the presser foot lifting mechanism, the fixed end of the thread cutting swing rod is hinged to the bracket, the movable end of the thread cutting swing rod is hinged to the top of a lower top bar, the movable end of the presser foot lifting swing rod and the movable end of the thread cutting swing rod are both located on the same side of the frame, one end of a reset spring hooks the movable end of the presser foot lifting swing rod, and the other end of the reset spring hooks the movable end of the thread cutting swing rod.

Disclosed is a solar photovoltaic system. The solar photovoltaic system is characterized in that a solar photovoltaic cell is mounted on a roof by support legs, an air flow channel is arranged between the roof and the solar photovoltaic cell, an induced draft fan is mounted in the air flow channel, and a wind cap is arranged at the upper end of the solar photovoltaic cell. The solar photovoltaic system has the advantages that the support legs are arranged on the lower side of the solar photovoltaic cell, so that a sandwich layer can be formed between the solar photovoltaic cell and the roof and is used as the air flow channel, heat is dissipated, the generating efficiency is improved, hot air can be quickly exhausted by the aid of the induced draft fan, and heat of the hot air can be quickly dissipated by the aid of the induced draft fan; the photovoltaic cell is reasonable in mounting position and structural design and is unaffected by the illumination time and the illumination intensity; safety factors such as water resistance of the roof, a structural supporting property and wind resistance are sufficiently considered; redundant electric power can be connected into a power grid, so that the power transmission cost and the power distribution cost are lowered, and the reliability of a power supply facility is improved; and the photovoltaic cell is harmonious with surrounding buildings and is low in operating cost, little in maintenance and long in service life.

The invention relates to a scientific experiment load light simulation device for an experiment cabinet, and relates to the technical field of space, the scientific experiment load light simulation device comprises an experiment cabinet main body, a scientific experiment load light part and a steel wire rope assembly, one side of the scientific experiment load light part is fixedly provided with a guide rail, the side wall of the experiment cabinet main body is fixedly provided with a guide groove, and the guide rail is slidably connected with the guide groove; the steel wire rope assembly is fixedly connected with the experiment cabinet body, and the lower end of the steel wire rope assembly is connected with the scientific experiment load light part and used for counteracting the gravity of the scientific experiment load light part. The device has the advantages that the scientific experiment load light part is suspended by the steel wire rope assembly, it can be guaranteed that the scientific experiment load light part cannot droop under the action of gravity, the space use environment of the guide rail and the guide groove is simulated, and therefore whether the installation positions of the guide rail and the guide groove are reasonable or not can be verified, and the feasibility of the device is verified. And meanwhile, an astronaut can practice and operate the experiment load conveniently.