366results about How to "Solve design problems" patented technology

The invention relates to the field of broadband satellite communication and navigation, in particular to an LTE system-based satellite mobile communication uplink transmitting terminal timing adjustment method. According to the LTE system-based satellite mobile communication uplink transmitting terminal timing adjustment method, the satellite LTE uplink timing synchronization problem is solved, and the process that in LTE, receiving terminal timing synchronization is conducted by means of TA (timing advance) is omitted; and meanwhile, the leader sequence design and detection problems caused by large user transmission time delay differences in satellite beams are solved, the one-time success rate of user access is increased, the influences of Doppler frequency shift on uplink timing synchronization are reduced, and the signal transmission efficiency is improved.

The invention discloses a multi-robot route planning method applied to a dangerous chemical environment, and belongs to the technical field of robot route planning. The method is applied to intelligent robots, can realize full map inspection of multi-robot under a complex and dangerous chemical environment with high dynamic performance, and can realize real-time formation reaction to special events. The core algorithm of the method is a deep reinforcement learning algorithm combined with a deep deterministic policy gradient and a curiosity driven algorithm. According to the core algorithm, thecomplex and tedious step of artificially designing environment rewarding in the same kind of algorithm are avoided, while the unknown complex environment is explored and adapted through the intrinsicrewarding and the sparse environment rewarding in the intelligent body itself; and meanwhile, a multi-Agent collaboration learning algorithm is adopted among the multi-robot to obtain the optimal cooperation strategy.

The invention discloses an optical system of a multispectral area array CCD (Charge Coupled Device) imager, relating to the field of design and manufacture of the optical system of the multispectral area array CCD imager and solving the problems that the traditional multispectral imager can only obtain spectrum information of a certain wave band of a target at the same time and can not realize the design requirements of a multispectral optical system with wide wave band range and temperature range and a long back working distance. The system consists of two sets of subsystems, a first set of subsystem realizes spectrum information of untraviolet, blue, green, red and infrared wave bands, and the system obtains information of different wave bands through two lens sets and a corresponding detector and carries out imaging; and a second set of subsystem image the obtained information by adopting two germanium lenses and a long wave infrared detector to realize spectrum information of a long wave infrared wave band. The invention realizes simultaneously imaging of a target at six wave bands by adopting two sets of optical systems and is suitable for multispectral imaging places with strict requirements on the volume and the weight, such as aviation shooting.

The invention relates to a method for designing a jointless track of a long and large bridge girder longitudinal butt plate type ballastless track for a high-speed railway. According to the method provided by the invention, ANSYS software is utilized to establish a latitude vertical space coupling statics model of the jointless track of the long and large bridge girder longitudinal butt plate type ballastless track for the high-speed railway, and ABAQUS software is utilized to establish a space coupling kinetic model. According to the method, the compositions of systems such as a steel rail, a fastener, track plates, a slurry placement layer, bed plates, a sliding layer, a consolidation mechanism, high-strength extruded sheets and L-shaped side check blocks, and structures such as supporting layers on a subgrade soil body and a road foundation and the action of high-speed vehicles are taken into full consideration, and friction factors of sliding layers on different bridge or friction plates, the longitudinal resistance of the fastener, the temperature difference of the bridge girder, the temperature difference of a ballastless track structure, the elastic modulus of the slurry placement layer and the like are calculated, so that the stress and deformation of the track and the bridge girder are obtained. The method provided by the invention is suitable for the design and computational check of the jointless track of the long and large bridge girder longitudinal butt plate type ballastless track for the high-speed railway, and providing service for the design calculation as well as conservation and maintenance of the high-speed railway.

The invention provides a low-voltage ride-through testing system of a wind generating set. The testing system comprises a voltage dropping system, an on-site measuring system, a remote monitoring system and an on-site controlling system, wherein the on-site measuring system is in bidirectional connection with the remote monitoring system; the remote monitoring system is in bidirectional connection with the on-site controlling system; the on-site controlling system is in bidirectional connection with the voltage dropping system; the voltage dropping system is in one-way connection with the on-site measuring system; and the on-site measuring system is in bidirectional connection with the on-site controlling system. The low-voltage ride-through testing system of the wind generating set, disclosed by the invention, is in accordance with criterion IEC61400-21, can realize voltage drop of different degrees and various types and can satisfy requirements of wind generating sets in all countries on low-voltage ride-through testing. The low-voltage ride-through testing system is a movable detecting system which is adaptable to performing the low-voltage ride-through characteristic testing on all wind generating sets which have been operated in the wind power field, and has high safety as well as high stability.

The invention provides a HARQ feedback method, a HARQ feedback device, a base station and a terminal, wherein the HARQ feedback method comprises the following steps of: determining a HARQ feedback time sequence of a TDD system adopting a sTTI according to a HARQ feedback time sequence of a TDD system adopting a legacy TTI, wherein the sTTI is formed by dividing the legacy TTI into P TTIs having shorter duration; and P is an integer, which is greater than or equal to 2; and performing HARQ feedback of received data according to the determined HARQ feedback time sequence of the TDD system adopting the sTTI. By means of the technical scheme of the invention, the design problem of a HARQ ACK or NACK feedback time sequence when the sTTI is used can be solved.

The invention provides a manual shale physical model and a manufacturing method and application of the manual shale physical model. The manufacturing method of the manual shale physical model includes the first step of mixing adhesives and stone powder evenly, wherein the adhesives are epoxy resin adhesives, the stone powder comprises 10%-70% of quart, 10%-80% of kaoline, 4%-25% of organic carbon powder and 3%-10% of calcite, and the use amount of the adhesives is 5%-35% of the total mass of the stone powder, the second step of filling a mould with mixtures of the adhesives and the stone powder, placing and fixing the mould on a pressure gauge horizontally, adjusting the perpendicular pressure intensity to 80-300 MPa, fixedly placing the mould for more than 24 hours for preliminary solidifying, and the third step of demoulding, drying a shale sample subjected to preliminary solidifying at the temperature ranging from 30 DEG C to 50 DEGC and obtaining the manual shale physical model. The obtained manual shale physical model is compact, has specific porosity and density, has anisotropic characteristics, has transverse isotropic characteristics and can provide a reliable basis for comparison and verification of research results of actual shale reservoir strata.

The invention discloses a span-adjustable bending test clamp with a positioning function, and belongs to the technical field of aircraft structure bending tests. The clamp comprises two clamp upper fulcrums, two clamp lower fulcrums, an upper clamp guide rail platform, a lower clamp guide rail platform and an acting barrel. The upper clamp guide rail platform and the lower clamp guide rail platform are provided with sliding rails respectively and provided with scales in the direction of the sliding rails. Threaded holes are formed in the sliding rails. The clamp upper fulcrums and the upper clamp guide rail platform are in sliding connection and are fixed through bolts. The clamp lower fulcrums and the lower clamp guide rail platform are in sliding connection and are fixed through bolts. The lower clamp guide rail platform is fixed to a test machine loading frame through a test machine lower chuck. The upper clamp guide rail platform is fixedly connected with the acting barrel through a test machine upper chuck. The problems that when large-load and large-deformation bend tests are carried out, the span of clamp fulcrums cannot be adjusted, and a clamp cannot adapt to test piece size changes or meet design requirements are solved.

The invention relates to a modeling method of a gas compressor capable of achieving graded regulation and control over the angles of adjustable vanes. The modeling method of the gas compressor capable of achieving graded regulation and control over the angles of the adjustable vanes is suitable for the gas compressor with two-grade adjustable vanes, wherein adjustable guide vanes serve as one grade, and adjustable static vanes serve as the other grade. The modeling method of the gas compressor capable of achieving graded regulation and control over the angles of the adjustable vanes comprises the steps that firstly, features of the gas compressor with the angle of the adjustable guide vanes and the angle of the adjustable static vanes controlled respectively are established; secondly, gas compressor model calculation is completed with the established features of the gas compressor. The modeling method of the gas compressor capable of achieving graded regulation and control over the angles of the adjustable vanes achieves the purpose of establishing a model of the gas compressor with the angle of the adjustable guide vanes and the angle of the adjustable static vanes of an inlet controlled respectively, or solves the problem that design and testing need to depend on a control system of an engine model.

The invention provides a robust adaptive trajectory tracking control strategy designed for a six-freedom-degree twelve-state model of an NSV (Near Space Vehicle) at a cruising flight stage. The method comprises the steps: firstly proposing a brand-new dynamic model approximation method which is applied to the design of a flight path controller; secondly designing an interference estimator independent of the controller through employing the adaptive technology; and thirdly employing dynamic inverse to be combined with a backstepping method, and respectively giving design methods for position, attitude angle and angular rate controllers, wherein an instruction filter is used for avoiding differential expansion in the backstepping design, and a tracking error caused by that a project approval instruction cannot be completely executed is corrected through a compensation item, so as to construct a robust item to inhibit the impact on the trajectory tracking from an interference estimation error. According to the embodiment of the invention, the above method is described in detail.

Disclosed herein is a system and methods for determining the alleles, neoantigens, and vaccine composition as determined on the basis of an individual's tumor mutations. Also disclosed are systems andmethods for obtaining high quality sequencing data from a tumor. Further, described herein are systems and methods for identifying somatic changes in polymorphic genome data. Finally, described herein are unique cancer vaccines.

The invention discloses a parameterization designing system for non-standard parts of hydraulic cylinders and a method thereof. The parameterization designing system for non-standard parts of the hydraulic cylinders comprises a work parameter setting and computing module, a part parameterization modeling module, an engineering drawing linkage updating module and a non-standard part warehouse management module. The method includes steps of creating a part model in a parameterization manner according to the set work parameters and conditions of the hydraulic cylinder and assembling integrally, and meanwhile updating two-dimensional engineering drawings automatically, and finally, realizing database management of developed non-standard parts so as to transfer, optimize and produce the non-standard parts conveniently. The parameterization designing system and the method thereof have the advantages of accuracy and high efficiency in design and convenience and reliability in management, cost for time and space of optimization of production process of the hydraulic cylinder is reduced, and the parameterization designing system can exchange data information with an operation management system of production enterprises and realize paperless working from development and production of non-standard parts.

The invention discloses a method for expanding modular multilevel converter based high voltage direct current (MMC-HVDC) model simulation scale under a real time digital simulator (RTDS) in the technical field of power system multilevel distribution simulation. The method comprises the following steps of: simulating three phase bridge arms of a modular multilevel converter (MMC) by six multi-bridge series modules of the RTDS; placing two multi-bridge series modules which simulates an in-phase bridge arm of the MMC in the same small step-length module; connecting the direct current sides of the three phase bridge arms, positioned in different small step-length modules, of the MMC by using a small step-length circuit model in the RTDS; establishing an alternating current system in the RTDS; connecting the rectifier side and the inverter side of the MMC by utilizing the small step-length circuit model; and respectively performing simulation computation on the rectifier side and the inverter side of the MMC by utilizing two computing communication units in the RTDS. By using the method, the problem of limited simulation scale of the MMC-HVDC under the RTDS is solved.

The invention provides a silicon carbide ceramic lined desulphurization pump and specifically relates to a centrifugal pump which is manufactured so that a pump case liner and an impeller are made of an integrated silicon carbide ceramic material or the impeller is lined with a ceramic material of a metal framework and which has wear-resisting and corrosion-resisting characteristics; the silicon carbide ceramic lined desulphurization pump is applied to a flue gas desulphurization system and used for conveying a slurry or other highly abrasive and highly corrosive solutions. The invention provides a centrifugal ceramic desulphurization pump in which a metal housing and a silicon carbide ceramic liner are integrated closely and integrally, and an impeller is made of the integrated silicon carbide ceramic material, and which is corrosion-resistant, and a manufacturing process of the centrifugal ceramic desulphurization pump. The centrifugal ceramic desulphurization pump comprises a pump body with a spiral volute chamber, and is characterized in that the pump body is lined with ceramics, an impeller nut is provided with a ceramic layer, the impeller is integrally made of the ceramics, a front cover plate core bar is arranged in the front cover plate of the impeller, while a rear cover plate core bar is arranged in the rear cover plate of the impeller, and a blade core bar is arranged in a blade of the impeller.

The invention belongs to the technical field of building steel structure, in particular relates to a limb type circular tube node transferring structure and a manufacturing method thereof. The limb type circular tube node transferring structure comprises a trunk circular tube, a fork transitional node which is connected to one end of the trunk circular tube, a limb supporting rod circular tube and a space bracket which is installed on the external surface of the integral node; the fork transitional node is formed by two sections of special cone tubes through a central pull rod and a transverse insertion plate by penetrating; two half tiles at the bottom of the fork transitional node are combined to be an integral circle which is connected with the trunk circular tube; the end portion of the fork transitional node is connected with the two fork supporting rod circular tubes. The limb type circular tube node transferring structure has the advantages of solving the design problem of the circular tube fork connecting node, being simple and reasonable in structural design, attractive in appearance design and the like.

The invention discloses a display module and a rugged tablet personal computer thereof. The display module comprises a panel module unit and an LCD (Light Crystal Display) module unit which are independent mutually, wherein the panel module unit is arranged in front of the LCD module unit and is detachably and fixedly connected with the LCD module unit. The rugged tablet personal computer comprises a host module and a display module, wherein the host module and the display module are independent respectively and are detachably and fixedly connected together; the host module comprises a rear cover and a host unit arranged in the rear cover; the host unit comprises a mainboard, a rigid disk, an IO (Input / Output) interface board, a power source and a power filter; the mainboard is respectively and electrically connected with the IO interface board, the power source and the power filter; and the mainboard is spliced with the IO interface board. The display module provided by the invention is strong in compatibility and easy to maintain and replace. The rugged tablet personal computer has the characteristics of complete computer modularization, high assembling efficiency, easiness for maintaining and replacing and balanced customization and industrialization.

The invention discloses a method for determining multi-state tracking guidance parameters. The method includes the steps that a multi-state motion model of aircraft flight process reentry is established, small-deviation linear processing is carried out on the multi-state motion model, and a processed linear equation is obtained; based on the linear equation, a guidance equation is obtained; based on a linear quadratic regulator (LQR), an LQR tracking controller is designed, and a corresponding feedback control rule is obtained; according to the multi-state tracking requirement, a controller weighting matrix is selected; according to the controller weighting matrix and the guidance equation, the guidance parameters are obtained through calculation. By means of the method, tracking control over multiple state quantities can be achieved according to the determined guidance parameters, and mutual influences in tracking of multiple state quantities are reduced.

The invention relates to a radiator and floor radiation heating loop cascade heat exchange station system and a heat gradient utilization method. The system and the method aim to solve the problems that an existing radiator heating and floor radiation heating second-class network parallel heat exchange station system and a radiator heating and floor radiation heating heat exchanger parallel heat exchange station system cannot effectively utilize the temperature of heating media, namely the second-class network return water temperature is high, and the investment of the radiator heating and floor radiation heating heat exchanger parallel heat exchange station system is excessively high. Particularly, the radiator and floor radiation heating loop cascade heat exchange station system comprises a heat exchanger unit, a second-class network circulating water pump unit P1, a second-class network circulating water pump unit P2, a water mixing pump unit P3, a control valve unit F1, a control valve unit F2 and a control valve unit F3. A radiator heating loop and a floor radiation heating loop are connected in series. The system and the method are applied to the field of heat-supply engineering.

The invention discloses Internet-based remote picture designing, printing and synthesizing system and method, aiming at large-size file transmission among different industries. The system comprises a server and a client side, the server comprises a management system server and a product synthetic system server. The management system server is used for storing high-precision pictures and synthesizing to the product synthetic system server; the product synthetic system server is used for storing the high-precision pictures from the management system server, and monitoring whether the client side submits necessarily generated practical printed files at regular time; the client side can look up thumbnail pictures from the management system server and acquires proper low-precision pictures from the server according to screen resolution so as to conduct secondary design and edition, and records the operation in a vector manner and synthesizes the inserted elements to the product synthetic system server. With the Internet-based remote picture designing, printing and synthesizing system and method, the problems of looking up, designing, printing pictures and the like in a remote mode can be solved, large-size file transmission can be avoided, and the working efficiency from remote picture designing to printing can be improved.

The invention discloses a combined optimization method for problems related to containers. Aiming at the problems relating to the combined optimization and operation deployment in industrial production, the invention adopts a coding form that takes group as object and is suitable for the problematic combination structure, so that a genetic algorithm can pass information that is related to the problems about chromosome heredity. The invention classifies the chromosome into an object part and a group part to generate chromosomes with different length. Besides, the invention, by utilizing a mutation operator and an inverse operator designed according to the characteristics of combination problem, carries out the iteration of algorithm for a plurality of times and finally acquires the quasi-optimal combined solution to the problem. Therefore, aiming at the problem of the container that an accurate global solution is hard to get, the invention adopts the combined optimized method by taking groups as objects, which effectively realizes the optimized design of container problems, resolves the design for fast stuffing and enhances the design efficiency.

The invention discloses a test device of performance test of a stepped diffuser of a headbox, comprising a water storage tank, a centrifugal pump, an electromagnetic flowmeter, a steady flow box, a transparent stepped diffuser, a transparent water tank, a PIV test system and the like. The water storage tank is successively connected with a first ball valve, a first flexible single ball rubber elbow, the centrifugal pump, an adapter flange, the electromagnetic flowmeter, a second ball valve, a reducer union, the steady flow box, a first piezometer, the transparent stepped diffuser, a second piezometer and a second flexible single ball rubber elbow; the transparent stepped diffuser, the second piezometer, the second flexible single ball rubber elbow are arranged in the transparent water tank; the second flexible single ball rubber elbow is connected with the water storage tank; and the PIV test system is arranged on a corresponding part of the transparent stepped diffuser. Judgment and forecast are performed on rag rectifying performance of the stepped diffuser when flow velocity distribution and cavitation conditions at stepped parts of an axial cross section thereof are obtained.

The invention discloses a no-balance-weight horizontal-rotation construction method of a steel truss girder bridge spanning a railway operating line. The construction method comprises the following construction steps: 1) the design and the construction of a rotation body facility at the rotating end is conducted, wherein the rotation body facility at the rotating end comprises a rotation body running track girder and a pier top facility No.25; 2) the design and the construction of a rotation body facility at the rotating shaft end is conducted, wherein the rotation body facility at the rotating shaft end comprises a positioning shaft, a bearing arm brace, a slide ship, a slide way and a pier pillar widening structure; and 3) the design and the construction of a rotation body running mechanism is conducted, wherein a rotation process adopts a walking type incrementally-launching running mechanism, and the running mechanism comprises the slide ship, a slide groove, an incrementally-launching hydraulic oil cylinder and an incrementally-launching counterforce device. Through technical economy comparison and selection, the invention adopts the construction scheme that a steel truss girder is assembled at a high level on the lateral side of the railway operating line by using a bracket method, and the girder is lowered and emplaced after being rotated to a design position by using the no-balance-weight horizontal-rotation method.

The invention relates to a performance index test method of a PIN-FET (p-intrinsic-n field effect transistor) light receiving assembly. The performance index test method comprises the steps that direct current light signals are input into a linear response region of the PIN-FET light receiving assembly so that the output voltage of the PIN-FET light receiving assembly is the first preset voltage V1; sine alternating current light signals with the frequency being 10KHz are added into the direct current light signals, and the peak-to-peak value of the output voltage of the PIN-FET light receiving assembly is the second preset voltage V2; and the frequency of the sine alternating current light signals is increased, the frequency of the sine alternating current light signals when the peak-to-peak value of the output voltage of the PIN-FET light receiving assembly is lowered to 0.707.V2 is read, and the 3dB bandwidth of the PIN-FET light receiving assembly is obtained. The performance index test method is used for solving the signal to noise ratio problem of an analog optical fiber sensing system, and the system design problem in the exiting analog optical fiber sensing can be creatively solved through the introduction of the performance index test method.

The invention relates to a superhigh-pressure pressure-reducing valve performance testing bench. The structure is as follows: in a casing, a filter is connected with the inflation port of a gas cylinder through a pipeline; the inflation port of the gas cylinder is connected with the air inlet of a pressure-reducing valve through the pipeline; the air outlet of the pressure-reducing valve is connected with a gas flowmeter; and the gas flowmeter is connected with a damping orifice plate through a pneumatic valve. The superhigh-pressure pressure-reducing valve performance testing bench solves the problems of designing, manufacturing and installing of a testing bench in a large-flow pressure-reducing valve performance testing system with gas medium pressure reaching superhigh pressure of 60 MPa and a pressure-reducing valve maximum flow being 120 L / min.

The invention discloses a terminal multiple-input-multiple-output high-isolation adjustable antenna including a dielectric substrate, metal ground, an antenna A, an antenna B, an isolated microstrip line, an adjustable network, and a matching network, parts of the front and rear sides of the dielectric substrate are provided with the metal ground, the head and tail areas belong to a non-metal ground area, the antennas A and B are arranged in the non-metal ground area of the dielectric substrate and have the spacing less than a wavelength of 1 / 10, a section of isolated microstrip line is arranged between the antennas A and B, the adjustable network is arranged between the isolated microstrip line and the antennas, and by adjusting the capacitance or inductance value on the adjustable network to adjust the resonant frequency points of the antennas, the coupling degree at the antenna resonant frequency parts is the lowest. the matching network is arranged between the feed line and the feed point, and the echo loss at the center frequency part in the adjustable frequency range is small by adjusting the matching degree of the resonant points via the matching network. The invention is not only suitable for the design of double antennas, but also is suitable for 4MIMO, 8MIMO or other multi-antenna systems.

The present invention discloses a parameter setting method of the bilateral LC type electric field coupling type WPT system constant current output, and belongs to the WPT technology field. A system comprises a high-frequency full-bridge inverter circuit, a primary side LC compensation network containing a primary side compensation inductor and a primary side compensation capacitor, a coupling capacitance plate containing two emission polar plates and two reception polar plates, a secondary side LC compensation network containing a secondary side compensation inductor and a secondary side compensation capacitor and a full-bridge rectifying and filtering circuit. The parameter setting method, under the premise of guaranteeing a constant current needed by a load, adjusts the parameters of the primary side and secondary side compensation networks to balance the voltage stresses of the primary side and secondary side compensation networks, so that the system outputs the constant current needed by the load, and the circuit zero approximation reactive circulation and the soft on-off of the switch devices are realized, the own reactive power of the coupling capacitance plate is lowest, the efficiency and the reliability of a WPT system are improved, the cost is reduced, and the transmission power grade is improved.

The invention discloses a system for realizing collection and playback of an input / output trace (I / O Trace) under a distribution environment. The system comprises an I / O Trace collection and playback control unit, an I / O Trace acquisition unit and an I / O Trace playback unit, wherein the I / O Trace collection and playback control unit is mainly used for managing a tester node; the I / O Trace collection unit and the I / O Trace playback unit are mainly used for acquiring host information, registering from a master control console, receiving a control command of the master control console and performing corresponding Trace collection and playback operation; and the problem of uncontrollability of an I / O request in the prior art is solved, and the generated Trace is inconvenient for the evaluation of a memory system, so that an I / O Trace collection and playback system which guarantees controllability of the I / O request and is convenient for design and the evaluation of the memory system is provided.

The invention discloses an undercarriage buffer. At first, load of an undercarriage is calculated when the undercarriage extends to the greatest degree, initial parameters of the undercarriage are calculated according to a traditional method, and wheel axial center and barycentric coordinates under a shutdown compression condition are calculated according to wheel axle center and barycentric coordinates under the condition that the undercarriage extends to the greatest degree; shutdown load of the undercarriage is calculated again; a dynamic compression curve is fit, a largest dynamic compression curved is fit according to largest stroke, and relevant parameters are calculated reversely via the largest dynamic compression curve, so that a complete method is formed. An enforceable calculation scheme of the undercarriage buffer is provided, and the difference between a theoretical value and a test value of load of the undercarriage can be reduced effectively. The largest stroke and the large dynamic compression load simultaneously meet designed requirements of the specific structure and the largest load coefficient under the condition that weight is not increased. Designed results can meet production reality better, and the design period of the undercarriage is shortened to a certain degree.

The invention discloses a hydraulic system for a tunnel loading test platform. The hydraulic system comprises a hydraulic station, an actuating mechanism and a control system, wherein the hydraulic station comprises a constant-pressure variable pump, a motor, a display element and an auxiliary device; the actuating mechanism is a spliced loading device consisting of a hydraulic cylinder, a push plate and a push rod, and the hydraulic cylinder, the push plate and the push rod are connected with one another in a threading manner; the entire spliced loading device is controlled by the control system; the control system consists of a central control element and an auxiliary control element, the auxiliary control element is a bottom layer electromagnetic valve and used for directly controlling the loading and unloading of the hydraulic cylinder; the central control element is an electro-hydraulic servo valve element and a pressure reduction-reversing electromagnetic valve element; when in low-pressure loading, the electro-hydraulic servo valve element is adopted, so that the hydraulic oil is conveyed from an oil supply circuit to the bottom layer electromagnetic valve; when in high-pressure loading, the pressure reduction-reversing electromagnetic valve element is adopted, so that the hydraulic oil enters the bottom layer electromagnetic valve through an upper electromagnetic reversing valve after being stabilized by a pressure reduction valve through the oil supply circuit.