47results about How to "No vibration noise" patented technology

The invention provides a speed changing magnetic pump, which comprises a pump body, a speed changing magnetic transmission device installed in a casing cavity and a driving motor. The speed changing magnetic transmission device comprises an inner magnetic rotor, an outer magnetic rotor, an isolation sleeve and a magnetic field adjusting ring. The inner magnetic rotor comprises an inner magnetic rotor magnet ring and an inner magnetic rotor magnet core, the outer magnetic rotor comprises an outer magnetic rotor magnet core and an outer magnetic rotor magnet ring which forms an annular cavity with the inner magnetic rotor magnet ring, and the isolation sleeve fixedly connected with a pump body is arranged in the annular cavity. The magnetic field adjusting ring fixedly installed on the isolation sleeve is an annular body formed by connecting a plurality of magnet core blocks and a plurality of epoxy blocks at intervals and used for adjusting magnetic fields of the inner magnetic rotor and the outer magnetic rotor to enable the rotating speed of an output rotating shaft connected to an impeller in a pump body to be different from the rotating speed of an input rotating shaft connected to the driving motor.

The invention relates to a magnetism transmission gear pair of a novel transverse magnetic field, which can be widely applied to wind power generation, electric cars, ship drive and other industrial transmission fields requiring direct drive. The magnetism transmission gear pair is characterized in that a driving wheel and a driven wheel of the magnetism transmission gear pair are of a flat disk shape, 2pr driving wheel permanent magnets 3 are distributed on the driving wheel, and 2ps driven wheel permanent magnets 7 are distributed on the driven wheel; a ferromagnetic magnetic modulation grid 6 playing a role of modulating an air-gap magnetic field is arranged between the driving wheel and the driven wheel, air gaps are reserved between the ferromagnetic magnetic modulation grid 6 and the end surfaces of the driving wheel and the driven wheel, and the ferromagnetic magnetic modulation grid 6, the driving wheel and the driven wheel have no mechanical contact and are distributed along the same axis; the air-gap magnetic field Bg passes through an air-gap plane along a route parallel to a rotation axis to form a transverse magnetic field of the magnetism transmission gear pair; and during working, power speed change transmission without mechanical contact and friction is realized by utilizing a principle of heteropolarity attraction of an N pole and an S pole of a permanent magnet material.

A novel magnetic drive oblique gear pair with an oblique air-gap magnetic field can be widely applied to the industrial drive field of wind power generation, electric cars, ship drive and the like with the requirement of direct driving. The novel magnetic drive oblique gear pair is characterized in that the inner hole of a stator of the magnetic drive oblique gear pair is conical internally; 2ps of stator permanent magnets 4 are distributed on an internally-conical stator iron core 3; a driving gear is conical externally; 2pr of driving gear permanent magnets 6 are distributed on an conical driving gear iron core 7; conical hollow driven gear ferromagnetic grids 5 for modulating the action of a space oblique air-gap magnetic field are mounted between the driving gear permanent magnets 6 and the stator permanent magnets 4; conical space oblique air gaps in coaxial distribution exist among the conical hollow driven gear ferromagnetic grids 5, the driving gear permanent magnets 6 and the stator permanent magnets 4 so as to form an air-gap magnetic field Bg of the magnetic drive oblique gear pair to pass along the conical space air gaps, thereby forming an oblique magnetic field of the magnetic drive oblique gear pair. During work, the power variable speed drive of the magnetic drive oblique gear pair is realized without mechanical contact and friction by utilizing the principle that N pole and S pole of a permanent magnetic material are attracted to each other based on different polarity.

The invention provides an automatic cutting, feeding and counting device for connected ribbons. The automatic cutting, feeding and counting device for connected ribbons comprises a main frame, a ribbon support, a guiding plate, a guiding arc, a control processor, a ribbon pressing plate, blades, blade holders, an indexing roller, an indexing mechanism, a support plate, pushing blocks, a pushing cylinder, valve seats, valves, valve cylinders and feeding tubes with square cross sections; by the indexing mechanism, the indexing roller can carry out indexing movement intermittently; the indexing roller rotates to drive the connected ribbons to be fed; the blades cut off rib plates of the ribbons and the connected ribbons; the pushing blocks push the ribbons into the feeding tubes with the square cross sections; compressed air pushes the ribbons to automatic ribbon tool terminals; and the control processor controls the indexing mechanism, the pushing blocks, the valves and the compressed air to carry out operation in sequence. The automatic cutting, feeding and counting device for connected ribbons can further be matched with the two or more automatic ribbon tool terminals. When the automatic cutting, feeding and counting device for connected ribbons is used for automatic packing and counting of the ribbons, parts such as the valve seats, the valves, the valve cylinders and the feeding tubes with the square cross sections are not required.

The invention relates to a locking device for a battery assembly and an electric automobile. The locking device comprises a main shaft structure, a rotating structure and a fixed block structure. Themain shaft structure comprises a main shaft body, a first circumferential limiting structure, a clamping structure, a limiting shaft structure and a limiting structure, the clamping structure is usedfor being connected with an external driving mechanism, and the limiting shaft structure is used for being connected with the locking block; the rotating structure comprises a rotating cylinder body,a second circumferential limiting structure arranged on the inner wall surface of the rotating cylinder body and a spring clamped in the rotating cylinder body, the main shaft body penetrates in the rotating cylinder body, the first circumferential limiting structure is matched with the second circumferential limiting structure to limit the rotation of the main shaft body, and the spring is arranged between the rotating cylinder body and the limiting structure; and the fixed block structure comprises a fixed block body with a connecting hole, and the rotating cylinder body penetrates in the connecting hole. According to the locking device for the battery assembly and the electric automobile, no vibration noise exists in the use process, the structure is simple, use is convenient and reliable, and the implementing cost is low.

The invention discloses an ion fan with a self-cleaning function, which comprises a collecting electrode, a discharge electrode for heat dissipation, a discharge electrode for self-cleaning and an electrode frame. The collecting electrode comprises a substrate that is in contact with a heating element, and fins arranged at equal intervals on the substrate, wherein an ion wind channel is formed between the fins. The discharge electrode for heat dissipation is fixed to the electrode frame above the ion wind channel, and the discharge electrode for self-cleaning is located on the electrode framelocated on one side of the ion wind channel. The collecting electrode, the discharge electrode for heat dissipation and the discharge electrode for self-cleaning are connected with a power supply viawires, and the discharge electrode for heat dissipation and the discharge electrode for self-cleaning are controlled independently by switches. The ion fan is simple in the system structure, free of vibration noise, low in energy consumption and capable of better exerting the inherent advantages of the ion fan.

The invention discloses a bi-stable pulse electromagnetic valve, which is used for controlling a circulating path of a refrigerant in a refrigerating system and comprises a magnet exciting coil and a valve body component. The magnet exciting coil of the prior art comprises a coil winding, a thermistor and a current connecting insert. When the electromagnetic valve of the prior art is struck by lightning and disturbed by external high-voltage pulse during use, the magnet exciting coil of the electromagnetic valve produces instantaneous electromagnetic pulse magnetic fields so that error reversion produced by a core iron in the valve body component or vibration noise produced by unreliable core iron motion seriously affects the using reliability of the electromagnetic valve. The magnet exciting coil is connected in parallel with a voltage dependent resistor so as to radically solve the problem that the electromagnetic valve produces the error reversion or the vibration noise when the electromagnetic valve is struck by lightning and disturbed by the external high-voltage pulse and ensure the reliability of a product in the system.

Provided is a vibration generating device and mobile communication terminal thereof. The vibration generating device includes a first magnet disposed on the top of the bottom board; a vibration board arranged on the top of the first magnet and separated a certain distance from the magnet; a second magnet disposed on the bottom the vibration board and corresponded with the first magnet; an elastic component connected with the bottom board and the vibration board, for controlling the movement of the vibration board based on the repulsion force and attraction force of the magnets. The device of the invention improves the structure of the vibration generating device wherein the vibration is generated by the lift and the descent of the vibration board, therefore increasing the vibration intensity, decreasing the heating caused by the interior friction, eliminating the vibration noise, enhancing the durability, and adjusting the vibration number and vibration intensity.

The invention relates to a pile pressing machine which comprises a press machine body and a chuck (5). The chuck (5) is connected to the press machine body through a pin shaft. The press machine body comprises an upper machine body (1), a sliding seat (2), a base (3) and fixing clamps (4). The fixing clamps (4) are connected with the base (3). The base (3) is connected with the sliding seat (2). The upper machine body (1) is arranged on the sliding seat (2) and provided with installation holes (6) and a controller (7). The installation holes (6) are used for being connected with other components. The chuck (5) comprises a protecting mechanism (503), a hydraulic mechanism (501) and a clamping mechanism (502). By the adoption of the pile pressing machine, a pile planting manner is changed, hydraulic pressure is adopted for planting a pile, and the pile pressing machine has the beneficial effects of being low in noise, small in vibration, small in influence on a soil layer and the like.

The invention discloses a method for machining a high-precision bearing adapter sleeve. The method comprises the following steps: (1) removing inner stress of a workpiece; and annealing the workpiece; (2) processing the benchmark surface (3) using a lathe to cut a clamping claw of a hydraulic automatic chuck; (4) adjusting a clamping force of a hydraulic oil cylinder; removing the windage of a mainshaft to ensure cutting; adjusting the clamping force of the oil cylinder through an overflow valve and a hydraulic valve of the hydraulic oil cylinder; and oil pressure is within the range between 1 and 4 Pa; (5) adopting a machine clamp to rotate the position of a cutter; adopting a blade material of 1 / T15, wherein in a titanium carbide coating layer, a positive rake angle r is between 10 and 15 degrees; a rear angle alpha is between 5 and 8 degrees; an end cutting edge angle phi is 15 degrees; and (6) processing the workpiece by the mounting of four working positions. With the matching with the high-precision bearing adapter sleeve, a bearing has smooth operation, no vibration and no noise and can improve service life by 30 to 100 percent averagely.

The invention discloses a treadmill folding device with a lockable function and a using method of the treadmill folding device. The treadmill folding device comprises a treadmill platform main body and a first column, the lower end of the first column is movably connected with the two sides of the treadmill platform main body, the first column can rotate front and back relative to the treadmill platform main body, left and right symmetrically distributed first lockable telescopic mechanisms are connected between the middle of the first column and the two sides of the treadmill platform main body, a triangular area is formed among the first column, the treadmill platform main body and the first lockable telescopic mechanisms when the first lockable telescopic mechanisms are in the stretchedout state, and the first column is parallel or almost parallel to the treadmill platform main body when the first lockable telescopic mechanisms are in the drawn back state. When unfolded, the deviceis stable and reliable, when stored, the device is small in occupied space, and packing materials are also saved; when in the folded and stored state, the column is in the tightened and balanced state, and the column and a dial plate are prevented from generating vibration noise during transportation.

The invention discloses a high-precision temperature control film casting machine. A rubber roller, a patterned roller, a grinding roller, a first cooling roller and a second cooling roller are sequentially and rotationally supported on a rack from front to back, a rubber roller outer barrel is installed on a rubber roller end cover, a rubber roller semiconductor refrigeration barrel is laid on the inner barrel wall of the rubber roller outer barrel, the rubber roller outer barrel is provided with a flexible roller sleeve in a sleeving mode, two ends of the flexible roller sleeve are fixedly connected to roller sleeve supporting end plates at the corresponding ends respectively, end face cams are arranged on the inner sides of the roller sleeve supporting end plates, and cam rolling bodies installed on the roller sleeve supporting end plates are movably supported on the end faces of the end face cams; a patterned roller semiconductor refrigeration cylinder is laid on the inner cylinder wall of a patterned roller outer cylinder, a grinding roller cooling water cavity is formed between a grinding roller inner cylinder and a grinding roller outer cylinder, and the grinding roller cooling water cavity leads to a grinding roller end shaft water hole in a grinding roller end roller through a grinding roller end water hole in a grinding roller end cover. The casting machine not only can accurately control the temperature of the casting cooling roller, but also can control the transverse shrinkage phenomenon of a casting film.

The invention discloses an electromagnetic reversing valve. The valve comprises a valve body, valve cores, oil cavities and electromagnets; the valve cores and the oil cavities are formed in the valve body; the electromagnets are arranged outside the valve cores; sealed control cavities are formed among the electromagnets, the valve cores and the valve body, so that the control cavities do not communicate with the oil cavities; the control cavities communicate with each other through a connecting oil way; and oil flow between the control cavities is balanced through the connecting oil way. In the manner, with the electromagnetic reversing valve, the effect of pressure impact of working oil ports on the connecting oil way can be cut off while the valve core can be reversed smoothly, then the normal reversing cannot be affected, and the vibration noise can be avoided.

The invention belongs to the technical field of magnetic gear transmission, and particularly relates to a magnetic-gathering Halbach small-range magnetic gear reducer which comprises a machine shell, an end cover and an input shaft, two pieces of stator magnetic steel are arranged on the inner wall of the machine shell side by side in a spaced mode, two rotor discs are arranged on the input shaft side by side in a sleeved mode, and the space phase difference between the two rotor discs is 180 degrees. Rotor magnetic steel is respectively sleeved on the two rotor discs, the input shaft is respectively provided with non-magnetic baffle plates at two sides of the single rotor magnetic steel, the two rotor discs are also jointly provided with a crankshaft in series, two ends of the crankshaft are respectively connected with the two end covers, and the stator magnetic steel and the rotor magnetic steel are respectively of a magnetism gathering Halbach array arrangement structure. The magnetic gear reducer breaks through the bottleneck of friction clearance of a mechanical gear and the like, and compared with a mechanical reducer, the magnetic gear reducer has the advantages of being low in noise, free of friction, high in efficiency, high in durability and the like.

The invention discloses a hole plug for a paddle lifting hole and an installation method, and belongs to the technical field of ships. The hole plug comprises a first plug, a second plug and a connecting piece, the first plug is inserted into one end of the paddle lifting hole, the second plug is inserted into the other end of the paddle lifting hole, the connecting piece is located in the paddlelifting hole and is used for connecting the first plug with the second plug. According to the hole plug, a blade body can be prevented from being damaged in the process of removing the hole plug, theproblems of power fluctuation and vibration and noise are avoided, the service life of the blade is prolonged, and operation is facilitated.

The invention discloses a push-lean type rotary steering drilling system comprising a drill bit, a rotary shaft, a turning part, a push-lean assembly, a transmission and a control unit. The rotary shaft comprises an upper rotary shaft and a lower rotary shaft. The turning part is arranged on the outer side of the rotary shaft in a sleeving mode. The push-lean assembly comprises a plurality of push-lean parts arranged at intervals in the circumferential direction of the turning part. The transmission device comprises a transmission mechanism driving the push-lean parts to stretch out of the turning part. The transmission mechanism comprises a driving electromagnetic gear arranged on the upper rotary shaft, and a driven electromagnetic gear arranged on the turning part. A motion conversionunit is further included and converts rotary motion of the driven electromagnetic gear into liner motion of the push-lean parts. The control unit is used for modulating a magnetic field, so that the driving and driven electromagnetic gears achieve linkage through magnetic coupling and operate with an adjustable transmission ratio. According to the push-lean type rotary steering drilling system, circuits elements, conductive sockets and the like do not need to be arranged on the turning part, the structure of the turning part is simplified, the size of the turning part is reduced effectively, flexibility of underground feed motion is improved, and cost is lowered.

The invention discloses a constant-temperature vaccine transfer trolley adopting semiconductor solid-state refrigeration. The constant-temperature vaccine transfer trolley adopting semiconductor solid-state refrigeration comprises a trolley (1) and a refrigeration bucket (2). According to the constant-temperature vaccine transfer trolley adopting semiconductor solid-state refrigeration, the adopted trolley is provided with a chassis, wheels, a handlebar and a battery compartment, a storage battery is arranged in the battery compartment, and the chassis is provided with an electric control cabinet; the refrigeration bucket is provided with an interlayer, a semiconductor refrigeration chip is arranged in the interlayer in the side surface of the refrigeration bucket, a heat-insulation layeris arranged in the interlayer in the lower surface of the refrigeration bucket, and the refrigeration bucket is further provided with a temperature sensor and a bucket cover; the refrigeration bucketis located above the chassis, and the semiconductor refrigeration chip, the temperature sensor and the storage battery are connected with the electric control cabinet through a conductive wire separately; and during working, a vaccine bucket filled with vaccines is arranged in the refrigeration bucket, electric power is provided by the storage battery, the electric control cabinet controls the semiconductor refrigeration chip to carry out refrigeration, and constant temperature in the refrigeration bucket is kept. Due to the technical scheme of manually pushing the trolley to transfer the vaccines, constant-temperature transfer for the active vaccines in a clean area achieves the purposes of being capable of realizing constant-temperature control, avoiding noise and flying dust, and facilitating sterile treatment.

The invention relates to the field of washing machines of household appliances. 'Impeller' and 'drum' washing machines introduced from foreign countries have been applied for more than thirty years, but both washing machines still have innate and acquired defects and are far away from the goal of ideal washing machines for consumers. The originality of the inventor is to build a section of 'rail' of 'Made in China' and fill the psychological gap and perfect state of 'ideal washing' dreamed by hundreds of millions of families. So the invention has no impeller, drum or dehydration drum, adopts unusual 'three-no' unique design, namely a silent vacuum gravitation dehydration method with an electric control panel at a high position, a natural and orderly double-drying method, an anti-dry heating blind fire-free universal electric heating method for quick water heating, and a rigid-flexible power conversion method, and has four special washing functions of involute double-cam kneading, enclosing wall type rotary washboard scrubbing, intangible 'needles' penetration washing on woven holes, boiling type airbag and bubble bionic hand massaging and the like; the cleaning rate reaches 99 percent; and the novel washing machine is efficient, water-saving and energy-saving, is most suitable for high and middle-grade dress materials and the like, has no hidden trouble, is spectacular in form and comprehensive in manner, and possesses eight innovative matching technology and four safety protection measures. The novel washing machine can be called a big drill of an innovative scientific and technical result in the field of washing machines, and is also a new generation local 'only-child' which has been bred for thirty years in the field of the washing machines.

An automotive instrument pointer assembly fixture, comprising a horizontal support plate, a rotating clamp, a buffer spring, a pointer placement plate, a pointer clamp rod, a pointer positioning hole, a pointer and an instrument panel surface; the pointer placement plate protrudes from the base plate and it is located on the right side of the horizontal support plate and set close to the outer eaves of the base plate; the pointer positioning hole is opened on the top of the pointer placement plate, and there are six arrays in sequence, and the pointer is fixedly inserted in the pointer positioning hole. The inside of the hole; the top of the instrument panel is placed on the top of the axial support plate and the transverse support plate and is pressed and fixed by rotating the clamp around. The automobile instrument pointer assembly fixture is provided with a buffer spring, which is supported on the top of the buffer spring when the instrument panel is in the state of installation and positioning. The buffer spring can buffer the vertical downward extrusion force from the fixture to avoid The severe extrusion force directly presses the surface of the instrument panel against the axial support plate and the transverse support plate, resulting in extrusion damage to the surface of the instrument panel.

The invention discloses a sampling analysis device for atmosphere volatile organic compounds. The sampling analysis device comprises a low-temperature environmental box and an atmosphere sampler, wherein low-temperature cold trap devices are arranged in the low-temperature environmental box and comprise a first cold trap, a second cold trap and a third cold trap, the first cold trap comprises a first condensation pipe and a first semiconductor chilling plate set, and a first heating wire is wound on the first condensation pipe; the second cold trap comprises a second condensation pipe and a second semiconductor chilling plate set, and a second heating wire is wound on the second condensation pipe; the third cold trap comprises a third condensation pipe and a third semiconductor chilling plate set. The invention further discloses a sampling analysis method for the atmosphere volatile organic compounds. The sampling analysis device and the sampling analysis method can meet requirements on the online monitoring of the contents of the volatile organic compounds and can be used for automatically detecting the contents of the atmosphere volatile organic compounds in an on-site and online manner.

The invention discloses a fixed swing gate movement with damping property and flexibility. A radial buffering body and an axial buffering body are additionally arranged in an inner structure of the movement. In an operation process of the movement, vibration noise caused by manufacturing and mounting errors is not caused; meanwhile, in a rotation process, when the movement is dynamically impacted, the damage of the impact to a movement component can be relieved, and the impact of gate machine passage pedestrians to a vehicle can also reduced. A door wing fixing plate in a rotating cylinder component is connected to a rotating cylinder by a screw or a rivet other than a welding way, so that machining and surface treatment on the rotating cylinder are greatly facilitated, the surface treatment quality can be improved, and precision error caused by a connecting process is eliminated.

The invention discloses a material screw elevator which is provided with a support body, sliding rails, a material box, a packing auger shaft, a driving mechanism, a supporting frame and a second pulley shaft. The sliding rails are arranged on the two sides of the support body; the material box is used for containing materials; the packing auger shaft is arranged at the bottom of the interior of the material box and can output the materials contained inside the material box; the driving mechanism can drive the packing auger shaft to rotate; the supporting frame is fixedly connected with the material box and supports the material box; the two sides of the supporting frame are each provided with a first pulley shaft and a fixing shaft, a pulley is arranged at the end of each first pulley shaft and can slide in the corresponding sliding rail, and the fixing shafts are detachably connected with the support body through fixing blocks; and the second pulley shaft is arranged at the upper portion of the material box, a pulley is also arranged at the end of the second pulley shaft and can slide in the corresponding sliding rail. The material screw elevator is small in noise, the conveying amount is conveniently controlled, and the material screw elevator can be suitable for using requirements for different heights.

The invention discloses a three-pole sputtering ion pump, and belongs to the technical field of vacuum obtaining equipment. The three-pole sputtering ion pump comprises a shell with an air inlet pipe arranged at the top; a plurality of permanent magnets arranged outside the shell; and M cavities and N air exhaust assemblies. The cavities and the air exhaust assemblies are communicated with the side wall of the shell, M is equal to N, the N air exhaust assemblies are arranged in the cavities in a one-to-one mode. Each air exhaust assembly comprises an anode cylinder array, a plurality of anode needles and two parallelly arranged cathode plates, wherein the anode cylinder array is arranged between the two parallelly arranged cathode plates, the anode needles vertically penetrate through the cathode plates, and the positions of the anode needles correspond to the axes of the anode cylinders in the anode cylinder array. The permanent magnets are in contact with the outer walls of the cavities, and the positions of the permanent magnets correspond to the positions of the cathode plates in the adjacent cavity. According to the three-pole sputtering ion pump, the angle of the positive ion emitted into the cathode plates is increased, and the pumping speed of the sputtering ion pump under the conditions of high vacuum and ultrahigh vacuum is increased.

The invention discloses a switch door structure for an air-conditioning indoor unit and the air-conditioning indoor unit, which relate to the technical field of air-conditioning and are invented to solve the problem that the movement of the door body easily produces relatively large vibration noise in the drive structure of the opening and closing door in the prior art. The invention relates to a switch door structure for an air-conditioning indoor unit, comprising a front shell, an air outlet is formed on the front shell, a damper is arranged at the air outlet, and a driving assembly is connected to the damper, the driving assembly includes a driving part and a driven part, and the driving part passes through the The active part bracket is connected to the front shell, and the driven part is fixedly connected with the air door. The active part can drive the follower to move so that the damper opens or closes the air outlet. There is a reserved space at the connection between the active part support and the front shell. When the damper expands or contracts, the reserved space allows the active component bracket to move relative to the front shell. The invention relates to a switch door structure for an air conditioner indoor unit, which is used to open or close the damper of the air conditioner indoor unit.

The invention discloses a recording sheet discharge device. The device is provided with a driving roller and a driven roller which are used for discharging recording sheets, wherein the driving roller is driven to rotate, and the driven roller is butted with the driving roller to rotate. The device is characterized in that a circumference surface of the driven roller comprises a circumference surface part and a recessed part which is concave relative to the circumference surface part, the recessed part is a plurality of grooves which extend in a direction parallel to the axial line of the driven roller; and any line, which is parallel to the axial line of the driven roller, on the circumference surface passes through the circumference surface part.

The invention discloses an underwater vehicle, which comprises a casing and an impeller assembly installed on the casing. A gyro assembly is installed in the casing. The gyro assembly includes a gyro bracket and a control moment gyro group. The control moment gyro group includes four single The frame control moment gyroscope, each single frame control moment gyroscope includes a single frame, a gyro rotor, a single frame shaft, a single frame drive motor and a gyro rotor drive motor, the single frame drive motor is installed on the gyro bracket and drives the single frame through the single frame shaft The frame rotates, the gyro rotor driving motor and the gyro rotor are installed on the single frame, and the gyro rotor is driven to rotate by the gyro rotor driving motor. The control moment gyro group of the present invention can provide continuous and smooth output torque, which meets the requirements for agility and precision in navigation, and can realize zero turning radius under the state of zero momentum, greatly improving the maneuverability of the aircraft .

The invention discloses a high-precision temperature-controlled film casting machine. A rubber roller, a twisted roller, a frosted roller, a cooling roller 1 and a cooling roller 2 are rotatably supported on the frame from front to back, and the end cover of the rubber roller is equipped with The outer cylinder of the rubber roller, the inner wall of the outer cylinder of the rubber roller is covered with a rubber roller semi-conductor cooling cylinder, the outer cylinder of the rubber roller is covered with a flexible roller sleeve, and the two ends of the flexible roller sleeve are respectively fixedly connected to the roller sleeve supporting end plate at the corresponding end On the inner side of the supporting end plate of the roller sleeve, an end cam is arranged, and the rolling body of the cam installed on the supporting end plate of the roller sleeve is movably supported on the end surface of the end cam; The cooling cylinder, the grinding roller cooling water cavity is set between the grinding roller inner cylinder and the grinding roller outer cylinder, and the grinding roller cooling water cavity leads to the grinding roller end on the grinding roller end cover through the grinding roller end water hole on the grinding roller end cover Axis water hole. The casting machine can not only accurately control the temperature of the casting chill roll, but also control the transverse shrinkage of the casting film.

The invention discloses a light-emitting diode (LED) power supply driving circuit, which is used for being electrically connected with external alternating current and controlling an LED lamp, and comprises a rectifier bridge, a driving power module and a photoelectric coupler, wherein the rectifier bridge is used for converting the alternating current into direct current; the driving power module is used for outputting constant current and driving the LED lamp; and the photoelectric coupler is used for isolating, feeding back or correcting the output constant current. By the circuit, current fluctuation of the LED lamp can be automatically detected, fed back or corrected, stable and high-efficiency constant current is output through a field effect transistor, and the whole power supply driving circuit stably and reliably works and has the advantages that: high-frequency switch oscillation, electromagnetic radiation and high-frequency interference are not generated, vibration noise is absent, ripple resistance and interference resistance are high, electric energy efficiency is over 90 percent, the circuit has an anti-overload / overshoot protection function, and the like.

The invention relates to a hydrogen supply device for analytical instruments, belonging to the field of hydrogen supply. The device includes air intake coil, cabinet, filter, check valve, pressure gauge, ball valve, safety valve, hydrogen booster tank, thermocouple, thermostat, silicone heating jacket, insulation jacket, aluminum silicate insulation cotton balls , hydrogen storage tank, gas outlet coil and other components. It can purify hydrogen and provide hydrogen at any output pressure between 1‑20MPa. The hydrogen supply device has no vibration and noise, simple structure, easy to implement, simple, convenient and safe to operate, and occupies a small space. It can use the existing low-pressure pipeline hydrogen in the laboratory as the gas source without any liquid for heating or cooling. medium, there is no risk of leakage, and the intermediate gas path can be vacuumed during use, which will not cause a lot of gas waste.