99results about How to "Structure is easy to implement" patented technology

The present invention prevents the amount of slack from decreasing below a predetermined value when a yarn slack eliminating device is used to control a winding tension during a yarn winding process executed by a spinning machine. A winding device 12 winds a yarn spun by a spinning device 5, into a package 16, while a yarn slack eliminating device 10 is eliminating the slack of the yarn. During this process, when it is detected that the amount of slack in the yarn slack eliminating device 10 decreases below a predetermined value, the package 16 is separated from a rotating drum 13 to reduce a winding speed to increase the amount of slack. At this time, the time for which the package 16 remains separated is controlled in accordance with the winding diameter of the package 16 to adjust the aspect of reduction of the winding speed. When the amount of slack is increased, the time for which the reduction of the winding speed is continued and the amount of speed reduction are adjusted taking the winding diameter of the package into account. Therefore, the optimum speed reduction aspect can be set in accordance with a variation in the inertia moment of the package.

The invention discloses a full-automatic winding production line and a processing method thereof. The full-automatic winding production line comprises at least one automatic feeding machine, at leastone winding machine and an automatic winding disc feeding and discharging robot, wherein the automatic feeding machine is used for supplying a filament-shaped body; the winding machine is used for fixing a winding disc and driving the winding disc to rotate; and the automatic winding disc feeding and discharging machine can move the winding disc onto the winding machine and taking the winding discdown from the winding machine, and the position of the filament-shaped body can be determined visually when the filament-shaped body is grabbed and cut off. According to the scheme, the automatic winding disc feeding and discharging robot cooperates with the automatic feeding machine and the winding machine, so that the whole process of feeding, winding and discharging is achieved automatically,and the novel full-automatic winding production line which is simple in structure and capable of controlling the winding process easily is provided; in addition, the visual positioning technique can effectively and accurately determine the position of the filament-shaped body, so that automatic grabbing and shearing are made possible; and the visual positioning technique is good in flexibility andhigh in accuracy and efficiency, so that the winding efficiency is improved.

The invention discloses a differential capacitive micro-acceleration transducer and a manufacturing method thereof. According to the method, the manufacturing of a movable mass block and an elastic beam is completed by using a bulk-silicon process, and the structure manufacturing and the releasing of a device structure are simultaneously completed by using a dry etching method; a movable electrode and the movable mass block are same in shape and size, so that an operation of repeated photoetching is avoided, thereby greatly simplifying the process; the stiffness of the designed elastic beam is small in the sensitive direction and large in the sensitive vertical direction, therefore, the elastic beam is higher in selectivity and anti-crosstalk capacity; and a device is simply and reliably packaged by using a wafer-level low-temperature vacuum aligned-bonding technology, thereby facilitating the large-scale manufacturing of the device. In addition, the differential capacitive micro-acceleration transducer disclosed by the invention adopts a variable-area type operating principle, so that the movable mass block is only damped by a sliding membrane in the process of moving, thereby improving the sensitivity.

The invention discloses a coupling coil and magnetic core structure used for underwater wireless charging and an underwater wireless charging system. The coupling coil and magnetic core structure comprises a transmitting end and a receiving end. The transmitting end and receiving end comprise annular-shaped magnetic core skeletons and coils disposed on the skeletons in a coiled manner. The transmitting end coil and the receiving end coil are in an embedded arrangement, and a certain gap is arranged therebetween, and the transmitting end coil and the receiving end coil are coupled with each other, and a coupling magnetic field is in a radial direction. The transmitting end coil and the receiving end coil are coupled with each other by the radial magnetic field, and an object of realizing wireless electric energy transmission is achieved.

The invention provides a low-temperature drift band gap reference voltage circuit and method, and a chip of the circuit. The circuit comprises a self-biasing module, a band gap reference core module and a voltage generation module. The method comprises the following steps of generating a primary reference voltage; generating a reference voltage before compensation through base current correction and the primary reference voltage; and generating a low-temperature drift band gap reference voltage. The low-temperature drift band gap reference voltage circuit and method is applied to a power management chip. The method has the advantages that the band gap reference voltage source circuit with ultrahigh precision and an ultralow-temperature drift coefficient is realized, and the high-stabilityreference voltage can be provided for circuit applications with relatively high reference voltage requirements.

The invention relates to an oxide p-i-n junction device and a method for preparation the same, wherein the device comprises a substrate, a p-type oxide layer formed on the substrate, an n-type oxide layer formed on the p-type oxide layer, leading-out ends respectively formed on the p-type oxide layer and the n-type oxide layer to be connected with lead wires, and a ferroelectrics potential barrier layer arranged between the p-type oxide layer and the n-type oxide layer; the n-type oxide layer and the ferroelectrics potential barrier layer, which are arranged at one side of the p-type oxide layer, occupy one third to two thirds of the area of the p-type oxide layer with the other part used as the leading-out end of the p-type oxide layer; the surface of the n-type oxide layer is used as the leading-out end of the n-type oxide layer; the leading-out ends of the p-type oxide layer and the n-type oxide layer are respectively provided with precious metal bonding pads used to be connected with the lead wires; moreover, both the p-type oxide layer and the n-type oxide layer are metallic. With a simple preparation method and an easily realized structure, the device realizes diversified functions of a single device.

The invention provides a power management circuit and a chip thereof. The power management circuit comprises a pre-voltage stabilizing module, a linear voltage stabilizing module, and a bias current generation module. Input voltages sequentially pass through the pre-voltage stabilizing module, the linear voltage stabilizing module, and the bias current generation module to generate a pre-stabilized voltage VPR, a voltage stabilizing voltage VREG, and a bias current Ibias separately. The power management circuit in the chip provides a power supply voltage and a current bias for modules in the chip. The invention has the advantages that the circuit can generate stable voltages at high input voltage conditions to provide stable power supply for each module in a power management IC (IntegratedCircuits); output currents are stable, and the driving capacity is large; the power consumption of the power management circuit is low, helping to control the overall power consumption of the chip; and the circuit structure is easy to realize so as to be suitable for engineering application.

An EBPSK-based communication method and system are disclosed in the present invention, relating to the field of digital communications. The method includes: a transmitting end performs encoding and EBPSK modulation for an information sequence to obtain an EBPSK modulation signal; and a receiving end performs EBPSK demodulation and decoding for the EBPSK modulation signal to obtain the information sequence. The present invention can enhance the anti-interference ability of the EBPSK communication system.

The invention relates to a method for grinding double sides of a disc type rotary work piece, a double-sided grinding system and a vertical double-sided grinding machine. The method is to grip a work piece on a transfer system through an inverted rotary gripping mechanism, and feed the work piece into a vertical double-sided grinding device to grind double sides of the work piece. The system grinds the work piece by adopting the vertical double-sided grinding machine. The grinding machine is provided with a double-sided grinding head consisting of an upper grinding wheel and a lower grinding wheel which are oppositely arranged; the two grinding wheels are parallel to each other, are positioned on the top of the grinding head device, and are connected with a grinding wheel rotary drive system which can lead the two grinding wheels to rotate synchronously, wherein at least one of the grinding wheels is connected with a grinding wheel vertical motion drive system. The method, the system and the grinding machine are beneficial to improvement of the manufacturing efficiency, ensure that the horizontally placed work piece is uneasily deformed in grinding, guarantee high precision processing of the thin-disc type work pieces, have stable system performance, easily realized structure, convenient installation and small occupied space, can be widely applied to double-sided synchronous grinding of various parts, and are mainly used for processing of the disc type rotary work piece and other disc shaped work pieces.

The invention discloses a design method for a non-minimum-phase-controlled hydraulic turbine set rotation speed regulating system. The design method comprises the following steps: SS1 establishing a nonlinear mathematical model of a hydraulic turbine set according to an inelastic water hammer equation of the hydraulic turbine set given by an IEEE (Institute of Electrical and Electronics Engineers); SS2 performing precise state feedback linearization on the nonlinear mathematical model to obtain a linearized standard system; SS3 verifying whether a controlled system is a non-minimum-phase system or not; SS4 resolving a nonlinear sub system of the standard system; SS5 establishing a common form of a system controller; SS6 determining to-be-determined parameters according to a pole assignment theory; SS7 determining to-be-determined parameters according to a Lyapunov stability theory; SS8 designing the hydraulic turbine set rotation speed regulating system by utilizing a DSP (digital signal processor) controller. According to the design method, adverse effects generated by nonlinear non-minimum-phase characteristics in a production process are overcome very well, and the system can be guaranteed to have good control effects within a relatively large operation range.

The present invention relates to the technical field of neutron reflection, particularly to a neutron reflection spectrometer optical path structure capable of performing rapid switching between a polarization mode and a non-polarization mode. The optical path structure mainly comprises an incident arm, a sample table and a reflection arm, wherein the incident arm comprises a first slit, a second slit, a third slit, a focusing conduction pipe, a polarizer, a first translation table, a second translation table, a first platform, a second platform and an incident arm base, the sample table comprises a vertical electromagnet, a sample, a cryostat, a third platform, a sample attitude adjustment mechanism and a sample table base, and the reflection arm comprises a fourth slit, a lifting table, a polarization analyzer, a detector, a third translation table, a reflection arm base, a fourth platform and a reflection arm rotation drive mechanism. According to the present invention, the rapid switching between the polarization mode and the non-polarization mode can be achieved by simply controlling and adjusting the movements of the three translation tables and the lifting table, such that the structure is easily achieved, and the precision of the experiment is high.

The invention relates to an automobile magneto-rheological absorber based on a multistage circumferential flow mode. The absorber has an inner cylinder barrel which is packaged up and down. A piston having a certain number and aperture of piston holes and a piston rod are installed in the cylinder. The inner cylinder barrel has communication holes communicated with circumferential channels. Multistage circumferential channels are installed on the out wall of the inner cylinder barrel. Annular blocks with high magnetic conductive and the same sectional area as the circumferential channels are all arranged at both ends of each stage of the circumferential channel. The out wall of an external cylinder barrel is the winding position. Chucks themselves at the end of the external cylinder are main path of the magnetic force lines. A magnetic conductive cylinder is arranged between a coat of the absorber and a coil. The magnetic force lines form a closed loop circuit through the annular blocks, the circumferential channels and magnetorheological fluid, chucks at the end of the external cylinder, a magnetic conductive cylinder, and a support block upper end part. The maximum damping force provided by the structure is larger, the adjustment range is wider, the magnetic field use ratio is high, the energy consumption is little, the use is wide, the universality is strong, the structure is simple, it is convenient to maintain, and the absorber body has long service life.

The invention discloses a full-angle luminous LED (light-emitting diode) chip encapsulation structure, which comprises an LED chip. The full-angle luminous LED chip encapsulation structure is characterized by further comprising a base material, an electrode, a first adhesive layer, a second adhesive layer and a protective adhesive layer, wherein the base material is used for bearing the LED chip on the front side; the electrode is arranged on the front side of the base material and is used for being electrically connected with the outside; the first adhesive layer is arranged between the base material and the LED chip; the second adhesive layer is used for covering the LED chip; the protective adhesive layer is coated at the outer side of the second adhesive layer for playing a protection role; the LED chip is completely cladded by the first adhesive layer and the second adhesive layer; the first adhesive layer, the second adhesive layer and the protective adhesive layer are transparent; and the electrode and the LED chip are electrically connected. The full-angle luminous LED chip encapsulation structure has the beneficial effects that full-angle lightening of the LED can be achieved, and meanwhile, the full-angle luminous LED chip encapsulation structure is simple in structure and can fully protect the LED chip, and the machining technology is easy to realize.

The invention discloses a longitudinal gradient short-fiber piezoelectric composite material and a preparation method thereof, and relates to the technical field of material preparation. The longitudinal gradient short-fiber piezoelectric composite material comprises an interdigital electrode and a piezoelectric fiber composite layer, wherein the piezoelectric fiber composite layer is arranged between an upper electrode and a lower electrode of the interdigital electrode and comprises a plurality short-fiber piezoelectric composite units, the plurality of short-fiber piezoelectric composite units are sequentially pasted along an axial direction, the axial lengths of the plurality of short-fiber piezoelectric composite units are changed in a gradient way, and each short-fiber piezoelectriccomposite unit comprises a plurality of polarization short piezoelectric fibers and a plurality of polymer fibers. Polarization is completed before package of the longitudinal gradient short-fiber piezoelectric composite material, the polarization is complete and uniform, the problem of polarization dead zone is prevented, and meanwhile, the adaptability of a non-planar structure is improved. According to the preparation method of the longitudinal gradient short-fiber piezoelectric composite material, the longitudinal gradient short-fiber piezoelectric composite material is prepared, the structural size of the composite material is accurately controlled, and series and mass production of the piezoelectric composite material in structure and performance are easily achieved.

The invention relates to an online testing device and testing method for full-field deformation in the contact print of a rubber tire tread rubber material. The online testing device comprises a support platform, a linear loading adjustment mechanism, a rotation loading adjustment mechanism, an adaptive clamping mechanism and a vision detection system, wherein the linear loading adjustment mechanism and the vision detection system are fixedly connected on the support platform according to a certain location relationship; the linear loading adjustment mechanism and the rotary loading adjustmentmechanism are fixedly connected; the adaptive clamping mechanism is fixedly connected with a pressure sensor; and the pressure sensor is fixedly connected with a torque sensor. The device can completely simulate stress deformation of a tire tread rubber material of a tire in the contact print under various work conditions, can solve the problems that a single-point contact measurement mode of anexisting tire tread rubber material in the contact print is difficult to implement, has a large testing result error and cannot acquire full-field deformation characteristics of the tire tread rubbermaterial in the contact print by a non-contact vision measurement method, has the characteristic of concise structure, and is easy to control and adjust.

The invention discloses a trimaran anti-pitching decoupling controller and design method, belonging to the technical field of ship control. The trimaran anti-pitching decoupling controller includes a trimaran, a first PD controller, a second PD controller, a decoupling compensator, a first amplitude limit link, a second amplitude limit link, a heaving measurement module and a pitching measurement module. The closed-loop negative feedback control of the system is carried out to reduce the influence of the anti-pitching floating bodies, namely, a T-wing and a spray strip, on the heaving and pitching motion of the trimaran. According to the T-wing and the spray strip theoretical angle output by the decoupling controller, the lifting and lifting moment of the T-wing and the spray strip can be controlled to offset the wave force and wave moment of the ocean wave, so that the heaving and pitching can be reduced. For the trimaran anti-pitching decoupling control problem, a decoupling method based on the feedforward compensation is proposed, the decoupling of the T-wing and the spray strip, the two anti-pitching floating bodies can be realized, the performance in the respective effect area can be improved, the mutual interference control effect can be prevented, and the anti-pitching effect is optimal.

The invention discloses a polarization-maintaining ASE light source with an intensity noise cancellation function and a fiber-optic gyroscope. Output tail fibers of the polarization-maintaining ASE light source are connected with optical paths of the fiber-optic gyroscope respectively, and then intensity noise cancellation of the light source can be achieved. According to the polarization-maintaining ASE light source, the optical integrator is adopted to replace an isolator, a filter and a 50: 50 coupler, the optical integrator has the functions of isolation, filtering, polarization and lightsplitting, linearly polarized light is output, the number of optical devices can be effectively reduced, and the structural complexity of the ASE light source is greatly reduced. Light output by the optical integrator is linearly polarized light, the insertion loss of the optical integrator is small, the index requirements for the splitting ratio and polarization of the two polarization-maintaining couplers behind can be reduced, the whole structure is easy to achieve, and the machining cost can be reduced. Moreover, the splitting ratios of the two polarization maintaining couplers can be matched and adjusted according to the lengths of different optical fiber rings, and the structure is flexible.

The invention provides a remote control device for a vehicle key. The remote control device is used for solving the technical problem of how to remotely control and unlock a vehicle door. The remote control device for the vehicle key structurally comprises a key storage bin, a key key pressing mechanism and a controller, the appearance of the key storage bin is matched with the appearance of a vehicle key. The key key touch pressing mechanism is provided with two groups of pressing components; the setting positions of the two pressing components are respectively aligned with the setting positions of an unlocking key and a locking key on a vehicle key placed in the key storage bin; the pressing stroke of the pressing component meets the requirement that the unlocking key or the locking keyis triggered and returns to the original position in time after the unlocking key or the locking key is triggered. And the controller is electrically connected with a driving device of the key key pressing mechanism. The vehicle door can be remotely unlocked.

The invention discloses a vacuum pressurization impregnation apparatus for preparing a ceramic matrix composite material through a PIP method. The vacuum pressurization impregnation apparatus is characterized by comprising an impregnation device 60, a water bath heating device 70, a pressurizing device 10, a vacuuming device 20 and a power control device 90, wherein the pressurizing device, the vacuuming device and the impregnation device are connected by stainless steel pipes; the water bath heating device wraps the periphery of the impregnation device and can be used for heating the impregnation device, the pressurizing device is a pressurizing pump, the vacuuming device is a vacuum pump, and the power control device sequentially controls the impregnation device, the water bath heating device, the pressurizing device and the vacuuming device through a power line. The vacuum pressurization impregnation apparatus has the beneficial effects that (1) the vacuum, pressurizing and water bath heating impregnation methods are combined to effectively improve the efficiency of impregnating a fiber prefabricated member in a precursor in the process of preparing the ceramic matrix compositematerial by PIP; (2) the operation is simple and the device structure is easy to realize; (3) through water bath heating, a precursor solution can be heated uniformly, stably and gently, thereby improving the impregnation efficiency and quality of the precursor solution.

The invention relates to an intelligent automatic telescopic spray irrigation device which comprises a first pipe, a second pipe and a third pipe which are sequentially connected in a sleeving manner.A water inlet is formed in the bottom of the first pipe, a first piston is connected at the end, positioned in the first pipe, of the second pipe and connected with the second pipe in a threaded manner, a first spring is arranged in the first pipe and positioned on the periphery of the second pipe, a second piston is connected at the end of the third pipe positioned in the second pipe and connected with the third pipe in a threaded manner, a second spring is arranged in the second pipe and positioned on the periphery of the third pipe, a lighting device is arranged at one end, far away from the second pipe, of the third pipe, an annual sprayer is arranged at one end, close to the lighting device, of the third pipe, and spraying holes are formed in the sprayer. Compared with the prior art,the device has the advantages that the device is reasonable in structure and convenient to implement, intelligently and automatically extends and contracts and has a lighting function.

The invention discloses a soldering flux spraying system for wave soldering, which comprises a spraying unit (1). The system is characterized in that a power unit (2) is arranged on the outer side ofthe spraying unit, one end of the power unit is provided with a fixed guide rail (3), a slide block (4) of the fixed spraying unit (1) is arranged on the fixed guide rail (3), and the power unit and the block connected with a driving block slide along the fixed guide rail. The sliding of the spraying unit is realized by the arrangement of the fixed guide rail and the slide block of the fixed spraying unit, so the device has the advantages of small vibration and noise and stable operation in use; and the device has multiple types of sprayers with different diameters so as to realize the regulation on multiple flow rates, so that the atomization effect is more even.

The invention discloses an erbium-doped wedge-shaped waveguide amplifier capable of realizing high efficiency, large energy and small volume. A wedge-shaped double-cladding erbium glass waveguide structure is used, pump light is fully absorbed after passing through a gain medium for multiple times, and the absorption length and the absorption uniformity of the gain medium are increased, so that the heat effect is improved, and the pump absorption efficiency is effectively improved. A gain medium wraps the four sides of a material which absorbs 1.5 microns and does not absorb pump light, so that a self-excited oscillation loop is cut off, the influence of ASE is improved, the energy storage efficiency is improved, and the output laser energy is improved. The novel waveguide structure is small in size and compact in structure. The inner cladding and the outer cladding play a role of heat sink for the erbium glass, so that the gain medium can better dissipate heat, the temperature gradient of the center and the side surface of the gain medium is effectively improved, the heat effect is reduced, and high-energy output is realized. The amplifier gain medium is prepared by adopting a bonding technology, so that the whole structure of the amplifier is simpler and more compact, and integration and structural miniaturization are easy to realize.

A power conversion device is provided with a power conversion unit (4) (an inverter circuit, for example) having multiple switching elements (Sp, Sn) that can be made to perform reverse conducting; and a control unit (10) that prescribes ON-periods for each of the switching elements (Sp, Sn) according to the output voltage of the power conversion unit (4), and switches each of the switching elements (Sp, Sn). The control unit (10) makes the power conversion unit (4) perform synchronous rectification, and also adjusts the aforementioned ON-periods in line with the ON voltage drop of the switching elements (Sp, Sn).

The embodiment of the invention discloses a data conversion method and device, equipment and a storage medium, and the method comprises the steps: extracting to-be-processed space division data from inputted multichannel data; carrying out row crossing on the to-be-processed space division data, and writing the space division data after row crossing into a preset array, the array being used for processing the stored space division data according to a preset operation rule; carrying out column crossing on the data in the array and then outputting the data; and splicing the output data by utilizing row intersection to obtain time division data.

The invention relates to a fuel cell bipolar plate with an interrupt structure. An air interrupt structure, a hydrogen interrupt structure and a cooling water interrupt structure are respectively arranged on a negative pole plate and a positive pole plate of the bipolar plate, the air interrupt structure comprises a boss arranged at an edge runner groove and a boss arranged on an isolation region,the hydrogen interrupt structure comprises a boss arranged at an edge runner groove of the positive pole plate and a boss arranged on the isolation region, and the cooling water interrupt structure comprises a boss which is formed from grooves in the isolation regions of the negative pole plate and the positive pole plate in a cooling water cavity, a boss which is formed from grooves in runner ridges of the negative pole plate and the positive pole plate in the cooling water cavity and a boss which is formed from grooves in the isolation regions of the negative pole plate and the positive pole plate in the cooling water cavity. The bipolar plate has the advantages that no battery part is additionally arranged, the structure is easy to implement, the bypass flowing of air, hydrogen and cooling water can be effectively reduced, and the durability and the stability of the fuel cell are improved.

The invention discloses a structure for increasing one-way gain by side pumping and an implementation method. A non-absorptive cladding material is bonded on the outer side of a gain medium, so that pumping light is reflected on an upper reflecting surface, a lower reflecting surface and side surfaces of a cladding; and the two side surfaces have a relative angle, the light travels back and forthalong the gain medium while being reflected by the side surfaces, so that the light can pass through the gain medium for multiple times, the absorption of the gain medium is increased, and the size ofthe gain medium is effectively reduced while the pumping light absorption frequency is increased. Because the pump light is reflected for multiple times and passes through the gain medium, the energydistribution of the pump light is more uniform, the cladding material has high thermal conductivity, the temperature gradient of the gain medium can be effectively reduced, the possibility of damaging a device is reduced, and the quality of an output light beam is improved.

The invention discloses a bidirectional gradient short fiber piezoelectric composite material and a preparation method thereof, which relate to the technical field of material preparation. The bidirectional gradient short fiber piezoelectric composite material includes an interdigital electrode and a piezoelectric fiber composite layer. The piezoelectric fiber composite layer includes a plurality of short fiber piezoelectric composite units connected in sequence along the axial direction. The axial length of the short fiber piezoelectric composite units presents gradient change. Each short fiber piezoelectric composite unit includes a plurality of polarized short piezoelectric fibers and a plurality of polymer fibers, and the width of the polarized short piezoelectric fibers in the splicing direction presents gradient change. Polarization is completed before encapsulation. Polarization is complete, and there is no 'dead zone' for polarization. The adaptability to non-planar structures is enhanced. The structure size of the composite material obtained using the preparation method can be precisely controlled. The structure and performance of the piezoelectric fiber composite material can be serialized, and the piezoelectric fiber composite material can be mass-produced.

The embodiment of the invention discloses a liquid crystal display panel with an ultra-narrow lower frame. The liquid crystal display panel comprises a TFT array substrate, a CF substrate and a liquid crystal layer arranged between the TFT array substrate and the CF substrate, wherein the TFT array substrate comprises a substrate body, the substrate body comprises an active display area in the middle and peripheral area on the outer side of the active display area, at least one part of a lower frame area of the peripheral area extends out of the CF substrate, a pattern is etched on the lower frame area of the substrate body, an insulation layer is arranged on the pattern, the upper side of the insulation layer is etched to form a plurality of LCD conductive bonding pads, a plurality of via holes are formed in the insulation layer, and each LCD conductive bonding pad on the upper side of the insulation layer is electrically connected with the pattern etched on the lower frame area of the substrate body of the TFT array substrate through one via hole. The invention further discloses a corresponding manufacturing method. When the embodiment of the invention is implemented, the ultra-narrow lower frame of the liquid crystal display panel is achieved.

The invention discloses a rotating structure and a folding wing driven by shape memory alloy, and belongs to the field of rotating structures. The structure comprises a rotating shaft, a fixing piece and at least one shape memory alloy wire assembly. Each group of shape memory alloy wire assembly comprises a first shape memory alloy wire group and a second shape memory alloy wire group; the fixing piece comprises a vertical rod; one end of the first shape memory alloy wire group is connected with the rotating shaft, the other end of the first shape memory alloy wire groupis connected with the vertical rod, and the first shape memory alloy wire group is lengthened by a preset length at a preset temperature and can drive the rotating shaft to rotate by a preset angle around the axis of the rotating shaft in a first rotating direction when heated; one end of the second shape memory alloy wire group is connected with the rotating shaft, the other end of the second shape memory alloy wire group is connected with the vertical rod, the second shape memory alloy wire group is lengthened by a preset length at a preset temperature and can drive the rotating shaft to rotate by a preset angle around the axis of the rotating shaft in a second rotating direction when heated, and the first rotating direction and the second rotating direction are opposite; the preset lengthened lengths of the shape memory alloy wire assemblies are different. According to the invention, the two rotating parts can relatively rotate at a preset angle and reset.