181results about How to "Play a controlling role" patented technology

This invention relates to a static filature device pushed by a gas layer and its industrial application, in which, the device includes: a gas circulation push device, a gas drying and heating device, a sealed filaturing room, and air inlet at the top of the sealed room, a material room at the upper part of the sealed room, a spinneret at the lower part of the material room, electrode connected on the spinneret, a material receiving device at the lower part of the sealed room, an air outlet at the lower-right part of the room, a cooling device cooling gas flow with solvent and a solvent recovering device, which can make static filature to molding to polymers, increases spinning efficiency greatly by applying multiple sprayers, controls the temperature and humid of the entry flows to alter the temperature and humid of filature raw liquid, and further more, the pushed gas flow can drive the volatiled solvent in the process to flow out to be recovered.

The invention discloses a large-span tunnel arch secondary lining steel bar binding construction method based on skeleton beams. A bound tunnel arch secondary lining steel bar comprises an outer layer reinforcement mat, an inner layer reinforcement mat and a vertical connecting bar for connecting the outer layer reinforcement mat with the inner layer reinforcement mat. The construction method comprises the following steps of: arranging skeleton beam: arranging a plurality of skeleton beams below a tunnel arch primary supporting structure from front to back, wherein the skeleton beams are arch-shaped beams of which the radiuses are the same as that of the outer layer reinforcement mat, and the plurality of skeleton beams construct a load bearing structure of a tunnel arch secondary lining steel bar; and II, binding the tunnel arch secondary lining steel bar: binding the outer layer reinforcement mat on the upper parts of the plurality of skeleton beams, and suspending the inner layer reinforcement mat on the outer layer reinforcement mat through the vertical connecting bar. The method has the advantages of simple construction process, convenience in constructing, good use effect, high practical value, no damage to a paved waterproof structure and easiness and convenience in controlling the deflection of a large-span station arch secondary lining steel bar.

The invention discloses a method for optimizing the main steam pressure of a large steam turbine set, which belongs to the field of learning, modeling and optimizing algorithms of machines. The method comprises the following steps of: firstly, learning and modeling a heat loss characteristic sample set obtained by a machine set performance test by a support vector machine method; obtaining a parameter relation of machine set heat loss, main steam pressure, main steam temperature, ambient temperature and a machine set load; then learning a subset in the sample set, establishing a heat loss model and carrying out increment analysis; establishing a steam turbine set pressure optimizing model and optimizing and solving the steam turbine set pressure optimizing model by a genetic algorithm to obtain main steam pressure optimizing value and curve and an optimizing data set; and finally, carrying out secondary modeling on the optimizing data set to obtain a pressure optimizing characteristic relation. The method gives an optimized main steam pressure set value according to the current running condition of the machine set, greatly amplifies the optimizing range and is particularly beneficial to the energy saving and the consumption reduction of the large power station steam turbine set.

The invention discloses a DC energy consumption device, which comprises at least two voltage-sharing energy consumption modules and at least two first power semiconductor devices, wherein the at leasttwo voltage-sharing energy consumption modules are connected in series in the same direction to form an energy consumption unit, the at least two first power semiconductor devices are connected in series in the same direction to form a one-way conduction unit, and the one-way conduction unit is connected with the energy consumption unit in series. Each voltage-sharing and energy-consuming moduleis formed by connecting a DC capacitor and an energy-consuming branch in parallel; the energy-consuming branch is formed by connecting a second power semiconductor device and an energy-consuming resistor in series. The invention further discloses a control method based on the DC energy consumption device. When the voltage of a DC line rises, the second power semiconductor device can be controlledto control the on-off of the energy consumption resistor so as to stabilize the DC voltage. When the voltage-sharing energy consumption module breaks down, multiple bypass modes are adopted, so that the reliability of the device is guaranteed. The device is very high in cost performance, high in reliability and easy to implement.

The present invention relates to konjak dietary fiber healthcare biscuits and a preparation method thereof. The konjak dietary fiber healthcare biscuits are prepared by the following raw materials including, by mass, 30-50 parts of konjak powder, 20-30 parts of compound dietary fiber, 20-30 parts of whole wheat flour, 20-30 parts of purple sweet potato powder, 20-30 parts of vegetable oil, 5-8 parts of white granulated sugar, 3-5 parts of xylitol, 8-10 parts of egges, 10-15 parts of water, and 1-2 parts of leavening agent, wherein the compound dietary fiber is composed of apple dietary fiber, pawpaw dietary fiber and bamboo shoot dietary fiber with a weight ratio of 3:1:1. The konjak dietary fiber healthcare biscuits have comprehensive nutrition and have good healthcare effects.

The invention discloses an underwater signal electrical-coupling non-contact type bi-directional transmission connector, which comprises two parts, namely a plug and a socket. The plug and the socket are two independent waterproof and pressure-resistant cavities. Circuit elements are arranged in the cavities. The plug and the socket are interchangeable and are respectively connected with an electric energy and signal receiving device and an electric energy and signal sending device. During operation, the plug and the socket approach each other, and the electric energy and signals are transmitted between the receiving device and the sending device via the connector. The input electric energy and the output electric energy can be a direct current (DC) or an alternating current (AC). The transmission of the electric energy and signals is conducted based on the basic principles of electromagnetic induction. The high-frequency carrier of a signal is injected into the AC carrier of the transmitted electric energy, transmitted to the other end via a coupling coil and then extracted at the other end. The transmission frequency of the electric energy and the harmonic compensation capacitance value of a transmission module can be adjusted in real time via the signal, so that the transmission efficiency is always in the highest state. The connector can be applied in any sea of any water depth, and is stable in operation, long in service life and high in efficiency.

The embodiment of the invention discloses a video communication method, a system and a device and is applied to the field of communication technology. The video communication system establishes the communication connection with a terminal by a communication connecting element in a set top box and receives operational orders through the connection by an order receiving unit, wherein the operational orders comprise video-on-demand orders, or video recording orders, or video transferring orders or the operational orders on the set top box; an order operation unit carries out the corresponding operation according to the operational order; therefore, the terminal has the control function on the set top box; compared with the prior art that the set top box is controlled by a remote controller, the system of the embodiment of the invention can conveniently control the set top box, realize the communication of the long-range control video and form the bidirectional interaction of the terminal and the video receiving end.

The invention discloses a hardware polishing machine with a dust removal function. The hardware polishing machine comprises a dust removal box, wherein a waste box is fixedly mounted on the bottom at the right side of the inner wall of the dust removal box; the bottom at the left side of the waste box communicates with a gas exhaust tube; a first filter block is fixedly connected at the right side of the gas exhaust tube; a second exhaust fan is fixedly mounted at the left side of the gas exhaust fan; and a second filter block is fixedly connected at the left side of the gas exhaust pipe. According to the hardware polishing machine disclosed by the invention, a rotary rod drives fan blades to rotate for blowing dust to the surface of a conveyor belt, the conveyor belt rotates for feeding dust into a bent pipe, the first exhaust fan is used for extracting out dust from the bent pipe, dust enters the waste box through a straight pipe, dust is filtered by the first filter block in an inner cavity of the waste box and flows to the gas exhaust pipe, metal particles in dust are left in the waste box, and dust waste gas is purified by the second filter block through the second exhaust fan for being changed into harmless gas to discharge, so that the effect of protecting the environment is achieved.

The invention discloses a treatment method of the settlement of high-speed railway roadbeds in soft-soil areas. The treatment method comprises the following steps: firstly, reinforcing and strengthening the foundation of a high-speed railway roadbed; and then, reinforcing and strengthening the side slopes or the ground of the high-speed railway roadbed. In the step of reinforcing and strengthening the foundation of the high-speed railway roadbed, a plurality of rows of rotary jet grouting piles are constructed among original pile foundations at slope toes of a conventional high-speed railway roadbed for performing reinforcement and strengthening. In the step of reinforcing and strengthening the side slopes or the ground of the high-speed railway roadbed, grouting holes are formed in the side slopes or the ground of the conventional high-speed railway roadbed; perforated grouting pipe are inserted in the grouting holes; the seriflux is injected in the perforated grouting pipe, so that the reinforcement and the strengthening are completed. The treatment method of the settlement of high-speed railway roadbeds in soft-soil areas, provided by the invention is safe, reliable, scientific and reasonable, and low in cost. Through the adoption of the treatment method, the settlement of roadbeds is effectively controlled, and influence caused by the settlement of roadbeds on conventional roadbed structures and the surrounding environment is reduced.

The invention discloses a sparrow brace type device for deformation control and energy dissipation of a timber frame, which belongs to the technical field of timber structures. The sparrow brace type device for the deformation control and earthquake resistant energy dissipation of the timber frame is provided with a hinge type steel plate member and a sparrow brace type timber member, wherein a bolt hole which is used for connecting the reinforced timber frame is formed in the end of the hinge type steel plate member, and a deformation limiting device and a friction energy dissipation spacer are arranged in hinged positions of the hinge type steel plate member; the sparrow brace type timber member is fixed on the hinge type steel plate member and covers the outer part of the hinge type steel plate member. According to the sparrow brace type device, the deformation control and earthquake resistant energy dissipation of the timber frame and a reinforcing device are integrally designed, the sparrow brace type device is in sparrow brace type combination with the timber member, the sparrow brace type device has the characteristics of attractive appearance, simple structure, convenience in installation and good mechanical property, and a novel method is provided for repairing and reinforcing the timber frame.

The invention discloses a modular DC energy consumption device. The device comprises at least two voltage-sharing energy consumption modules, wherein the at least two voltage-sharing energy consumption modules are connected in series in the same direction, each voltage-sharing energy consumption module comprises a DC capacitor, a current-limiting unit, an energy consumption branch and a bypass switch, the DC capacitor and the current-limiting unit are connected in series to form a first series unit, an initial end and a tail end of the first series unit both are used as an initial end and a tail end of the voltage-sharing energy consumption module, the energy consumption branch is connected in parallel with two ends of the DC capacitor, and the bypass switch is connected in parallel with the first series unit. The invention also discloses a control method of the modular DC energy consumption device. When a voltage of a DC circuit is raised, the withdraw of an energy consumption resistor is controlled by controlling a first power semiconductor device so as to stabilize a DC voltage; and when a fault occurs in the voltage-sharing energy consumption module or a DC circuit is circuit-shorted, a discharging current of the capacitor is limited by the current-limiting unit. The device is high in cost performance and high in reliability and is easy to implement.

The invention relates to an integrated LED (light emitting diode) display unit panel with a large viewing angle. The integrated LED display unit panel comprises an LED display module. A driving IC (integrated circuit) is welded on a driving circuit board, the back surface of a circuit board is connected with the driving circuit board through socket strips, and LED wafers are fixed on the front surface of the circuit board. The integrated LED display unit panel is characterized in that the integrated LED display unit panel further comprises transparent face masks and shading layers; air outlet holes are reserved at the positions, corresponding to the LED wafers, of the shading layers; the shading layers are connected with the front surface of the circuit board tightly; the transparent face masks are inserted into the LED wafers; and the back surfaces, away from the LED wafers, of the transparent face masks are connected with the shading layers tightly. The integrated LED display unit panel has the advantages of large viewing angle, high contrast, low light loss, low production cost and the like.

The invention relates to an anti-collision guardrail construction trolley, a construction method and an engineering supervision platform. The trolley comprises a supporting part, a balance weight partand a standing table. An automatic walking system is arranged on the lower side of the supporting part, a hydraulic adjusting and formwork folding and unfolding system is further connected with the supporting part, the hydraulic adjusting and formwork folding and unfolding system comprises at least one hydraulic adjusting subsystem, each hydraulic adjusting subsystem comprises a hydraulic oil cylinder part and a formwork part, and the hydraulic oil cylinder parts are connected with the formwork parts. The construction method comprises the steps of first-stage trial operation model building and second-stage conventional operation. The engineering supervision platform comprises a plurality of crash barrier construction trolleys, a plurality of construction site control centers, an engineering research and development center and a safety supervision center. According to the anti-collision guardrail construction trolley, the cost is reduced, and the material distribution efficiency is greatly improved; the control system is arranged to control the whole construction of the trolley, the intelligent degree is greatly improved, and the construction efficiency is remarkably improved.

The invention discloses a garden pest monitoring method and a large vertical garden pest monitoring device. A transparent intercepting plate with a hole is elevated through a bracket, and pests are attracted by means of a slow-release attractant, so that the insects fall into an insect collecting funnel at the bottom after colliding with the transparent intercepting plate; a pest collecting cup containing a specimen preservation solution is arranged below the insect collecting funnel to collect the fallen pests, so that garden pest monitoring can be achieved by counting the pests in the pest collecting cup; meanwhile, the garden pests are subjected to centralized trapping and killing, and the number of the garden pests can be effectively controlled.

The invention relates to the field of tunnel technical control, in particular to a double-layer firefighting escape tunnel which comprises a concrete shell with a circular section, an anti-seepage protective layer, an upper-layer travel lane, a lower-layer travel lane, a lower-layer smoke exhaust channel, ventilating and lighting systems, traffic lamps, vertical bearing walls, an upper-layer smokedischarge channel, anti-collision protective pads, fireproof heat-insulation walls, escape channels, a gravel and coarse sand layer, firefighting water spray devices, lane structure bottom plates, fireproof sensing and alarm systems, an upper-layer escape channel, a lower-layer escape channel, through holes, smoke exhaust machines, waterproof cloth and a special cabin for sponge cities. The double-layer firefighting escape tunnel has the advantages that the continuous anti-seepage protective layer is arranged on the outer side of the concrete shell with the circular section, the upper-layer travel lane is arranged on an upper layer of the double-layer firefighting escape tunnel, the lower-layer travel lane is arranged on a lower layer of the double-layer firefighting escape tunnel, accordingly, the problems that personnel in tunnels cannot escape from danger at present due to accidents such as collapse, fire hazards or blocked tunnel exits and the like can be effectively solved by theaid of the double-layer firefighting escape tunnel, and personnel in the double-layer firefighting escape tunnel can effectively save themselves when danger and accidents occur.

The invention relates to a damping control device of an offshore platform, a high-rise building and related structure, belonging to the ocean engineering and civil engineering structure damping technology field. The damping control device is characterized in that an upper-layer connection steel plate 5 and a lower-layer connection steel plate 3 which are used for connecting a viscoelastic material layer 4 are arranged and connected in cross shape, the upper layer connection steel plate 5 is connected with an auxiliary positioning device 1 by bolts 2, the auxiliary positioning device 1 is connected with a structural upper layer beam by the bolts 2, the lower-layer connection steel plate 3 is connected with a structural support 7 by the bolts 2, the viscoelastic material layer 4 is parallel to a structural upper layer plane and can deform along two directions in the plane, and simultaneously, the deformation of the viscoelastic material layer 4 outside the material layer plane can be avoided. The damping control device has the effects and benefits that: the damping device effectively reduces the vibration response of the related structure, greatly reduces the cost of the damper simultaneously, has simple structure and convenient construction, and can produce huge economic benefits and social benefits when being applied in the related structure engineering.

The invention discloses a display panel and a display device, and relates to the technical field of display, the display panel comprises a drive circuit, wherein the drive circuit comprises N stages of shift registers cascaded with each other, and N is greater than or equal to 2; each shift register includes: a first control unit; a second control unit; a third control unit; and a fourth control unit which is used for receiving the third voltage signal and the fourth voltage signal and generating an output signal in response to the signal of the second node and the signal of the fourth node, wherein the third voltage signal is a high-level signal, the fourth voltage signal is a low-level signal, the potential of the first voltage signal is higher than the potential of the third voltage signal, and / or the potential of the second voltage signal is lower than the potential of the fourth voltage signal. The shift register solves the problem that a shift register in the prior art cannot meet different voltage requirements of a pixel circuit for different signals.

The invention discloses a gene chip for detecting 15 clinical common pathogenic microorganisms. The gene chip comprises specific detection probes fixed on a solid phase vector, wherein the probes are designed for 16SrRNA gene and ITS gene sequences of staphylococcus aureus, klebsiella pneumoniae, pseudomonas aeruginosa, proteus mirabilis, Escherichia coli, shigella, enterobacter aerogenes, pseudomonas fluorescens, candida albicans, candida glabrata, candida tropicalis, candida parapsilosis, aspergillus terreus, aspergillus flavus and rhizopus oryzae, and screened and verified by repeated tests, and have high hybridization specificity and accuracy. The chip provided by the invention ensures simple detection operations and relatively lower cost, saves time, is applied to the screening of the clinical common pathogenic microorganisms, the early rapid diagnosis of critical patients and the diagnosis of suddenly occurring infection event pathogens and favorable for clinically rapidly diagnosing infection sources and functions in the early detection and early diagnosis of clinical diseases.

The invention discloses a power output control circuit which is arranged between the output end of a power circuit and a load. The power output control circuit is characterized in that the power output control circuit is composed of a switch tube and a detection control circuit set with the preset voltage value, the switch tube is connected between the output end of the power circuit and the load in series, the detection control circuit detects the output voltage of the power circuit, when the output voltage is lower than the preset voltage value, the switch tube is controlled to be turned off, and when the output voltage exceeds the preset voltage value, the switch tube is controlled to be turned on. The power output control circuit has the technical advantages that the supply voltage establishing time taken to supply power to the load through the power circuit can be adjusted, and the starting capability of the self-oscillation power circuit is improved. A back-level power source can be easily and reliably started until a pre-level power source is completely started, and the accurate and reliable starting time sequence of a multi-layer power supply system starting is guaranteed. The invention further discloses the multi-layer power supply system with the power output control circuit.

The invention discloses a hydraulic machine provided with an automatic-sensing safety protection device. The hydraulic machine comprises a base plate, upright posts and a top plate; the upright postsare fixedly installed at the two sides of the upper surface of the base plate; the top plate is fixedly connected between the top ends of the two upright posts; a hydraulic cylinder is fixedly installed at the middle part of the top end of the top plate; the end part of the hydraulic cylinder is fixedly connected with a hydraulic rod after penetrating through the top plate; and one end of the hydraulic rod is fixedly connected with a supporting plate. According to the hydraulic machine disclosed by the invention, the middle part of the bottom end of the supporting plate is provided with a fixed base; the fixed base is internally provided with a sliding chamber; a limiting plate, a spring and a connecting column are arranged inside the sliding chamber; a good shock absorption and bufferingeffect is achieved; when the telescopic hydraulic rod is driven to move downwards by the hydraulic cylinder, the limiting plate slides inside the sliding chamber so as to extrude the spring so that apressing plate can achieve a certain buffering effect, thus the pressing plate can achieve a buffering and shock absorption effect on a workpiece which is machined on a worktable; by arranging a shockabsorbing mechanism at the bottom end of the worktable, the vibration, generated by the pressing plate, of the worktable can be effectively reduced; and the stability is improved.

The invention relates to health-care purple sweet potato and Chinese yam biscuits and a preparation method thereof. The health-care purple sweet potato and Chinese yam biscuits are prepared from the following raw materials in parts by weight: 50-80 parts of purple sweet potato powder, 30-50 parts of yam flour, 20-30 parts of composite dietary fibers, 20-30 parts of vegetable oil, 5-8 parts of white granulated sugar, 3-5 parts of xylitol, 8-10 parts of eggs, 10-15 parts of water and 1-2 parts of a leavening agent, wherein the composite dietary fibers consist of apple dietary fibers, papaya dietary fibers and bamboo shoot dietary fibers in the weight ratio of the apple dietary fibers to the papaya dietary fibers to the bamboo shoot dietary fibers being 3 to 1 to 1. The health-care purple sweet potato and Chinese yam biscuits are comprehensive in nutrients and have a favorable health-care effect.

The invention discloses a circuit control device for preventing false touch, includes a main housing and a grounding protection device arranged on a lower side of the main housing, the main shell is provided with an on-off cavity with an opening upward, Between that inn walls of an on-off chamber are arranged pressure plates capable of sliding up and down, A first spring is fixedly installed between the lower end surface of the pressure-resisting plate and the lower end wall of the through-and-through cavity, A low side of that on-off cavity is provided with a circuit on-off device, An upperend of that circuit on-off device is rotatably connected with a control shaft extending upward, the on-off cavity is provided with a winding wheel control device which is rotatably matched and installed on the outer surface of the control rotating shaft, by disconnecting the rotation control circuit of the bobbin, A ratchet wheel locking device located on the upper side of the winding wheel control device is arranged in the on-off cavity, The ratchet locking device is used for locking the control rotating shaft when the circuit is in communication to prevent the circuit from being disconnectedby wrong operation. A fingerprint detecting device is arranged on the upper side of the control rotating shaft and is used for controlling the operation of the ratchet locking device. The fingerprintdetecting device is used for controlling the operation of the ratchet locking device.

The invention relates to an integrated display unit of a color LED display screen and a manufacture method thereof. The integrated display unit board of the color LED display screen comprises an LED display module and a surface cover base plate, wherein the positions of the surface cover base plate, which correspond to LED wafers of the LED display module, are provided with light outlet holes; a drive IC (integrated circuit) is welded on a drive circuit board, the back surface of a circuit board is connected with the drive circuit board through pin headers and female headers, and the LED wafers are fixed on the front surface of the circuit board; the side wall of every light outlet hole of the surface cover base plate is provided with a high-reflectance diffuse-reflection surface; and the surface cover base plate is fixed on the circuit board, and the light outlet holes of the surface cover base plate are filled with transparent colloid. Due to the high-reflectance diffuse-reflection surfaces of the side walls of the light outlet holes of the surface cover base plate, light reaching the sidewalls of the light outlet holes can be subjected to the diffuse-reflection dodging to significantly improve the light emitting uniformity of LEDs which have three colors of red, green and blue, the light energy usage rate is increased, and the heat dissipation burden is reduced. The integrated display unit board of the color LED display screen has the advantages of large visual angle, low light loss and the like.

The invention discloses a method for preparing a plant medicament for preventing and controlling wheat scab disease. The plant medicament comprises 5,000 grams of pine needle, 2,000 grams of tobacco leaf, 3,000 grams of nux vomica, 8,000 grams of tea dregs, 3,000 grams of thunder god vine powder and 5,000 grams of lime sulfur mixture. The method comprises the following steps: crushing the pine needle, tobacco leaf, nux vomica, tea dregs and thunder god vine powder according to the proportion and putting the crushed mixture into a large iron pan, adding 100 kilograms of warm water into the iron pan and soaking the mixture for 5 minutes, then decocting the mixture by intense fire for 30 minutes, stopping the fire, filtering the decoction, and mixing and stirring the decoction and the lime sulfur mixture for 10 minutes intensively to form a finished product.

The invention discloses a changeable air intake manifold of an engine and a control method of the changeable air intake manifold. The changeable air intake manifold is provided with a first air intake channel and a second air intake channel, wherein the second air intake channel is longer than the first air intake channel. The changeable air intake manifold is characterized in that an outlet of the first air intake channel and an outlet of the second air intake channel are arranged adjacent to each other and converge to an outlet of the changeable air intake manifold, valve plates are hinged to the adjacent pipe walls of the outlet end of the first air intake channel and the outlet end of the second air intake channel, a valve plate driving mechanism is arranged, and the valve plate driving mechanism drives the valve plates to rotate according to working conditions of the engine. The air intake flux can be controlled by controlling the positions of the valve plates. Through the changeable air intake manifold, the transient response performance of the engine is promoted, and the changeable air intake manifold is simple in structure and convenient to control.

The invention discloses an intelligent controller and method reducing the shimmy of a fan blade. A steel truss is arranged inside the blade. A magneto-rheological damper and an acceleration sensor are fixed to the steel truss. A computer obtains the acceleration information of the assigned point of the blade. The voltage needing to be provided is obtained through the fuzzy algorithm, the movement of the magneto-rheological damper is controlled, and therefore the shimmy of the fan blade is reduced. By means of the intelligent controller and method, the characteristic that the internal space of the blade is narrow and closed is overcome, a certain control function can be achieved for the blade shimmy in a wind power generator, the fatigue load of the fan can be reduced, and the safety coefficient of the blade in the using process is increased.

The invention discloses a high-efficiency and environment-friendly sewage treatment device. The sewage treatment device comprises filtering devices, a biological treatment device, a disinfecting tank,communicating pipes, water inlet pipes and a control terminal, wherein the filtering devices include a first filtering device and a second filtering device; the first filtering device is mounted on the second filtering device; the biological treatment device is mounted on one side of the second filtering device; the biological treatment device is mounted on the disinfecting tank; the water inletpipes include a first water inlet pipe and a second water inlet pipe; the communicating pipes include a plurality of first communicating pipes, a plurality of second communicating pipes, a plurality of third communicating pipes and a plurality of fourth communicating pipes. The sewage treatment device achieves the filtering effect through the first filtering device and the second filtering device,and can carry out secondarily recycle on waste residues obtained after the completion of operation and purified sewage; the sewage treatment device is simple in structure and reasonable in design, greatly improves the sewage purifying efficiency, and is effective and practical.

The invention discloses a tractor, which comprises a tractor shell. A synchronous motor and a speed reduction gear set are arranged in the tractor shell, the synchronous motor comprises a stator part and a rotor part, the stator part comprises an upper motor cover, a motor shell and a coil frame, the rotor part comprises magnetic steel arranged between the upper motor cover and the motor shell, acenter shaft is arranged at the center of the magnetic steel, and a center gear is arranged on the center shaft above the motor shell. The speed reduction gear set comprises a first gear and a secondgear, a slope separator for controlling vertical moving of the center gear is arranged on the center shaft, the magnetic steel and the center gear are provided with cross-tooth structures which are matched to each other, a center spring is arranged between the magnetic steel and the center steel, both the first gear and the second gear are provided with cross-tooth structure which are matched to each other, and a gear spring is arranged between the first gear and the second gear. The center gear and the first gear always mesh to each other when respectively move.

The invention relates to an asymmetric eight-figure steel plate built in an epiphyseal arrest, comprising two single-side hole plates, wherein hinge holes are respectively arranged on the single-side hole plates which are connected by a pivot through the hinge holes and can be assembled into the asymmetric eight-figure steel plate. The invention also provides application of the asymmetric eight-figure steel plate built in the epiphyseal arrest. The asymmetric eight-figure steel plate can be assembled, has various specifications and can be combined in various manners according to the condition that the deformities on two sides of an epiphyseal line of a patient are asymmetric. Proved by an animal experiment, the asymmetric eight-figure steel plate can play a role of effectively controlling the unmatured epiphysis growth and the skeleton shape and is a safe and effective medical instrument for the semi-epiphyseal arrest operation mode.