171 results about "Active support" patented technology

The invention discloses a power grid active support control method for an offshore wind power low-frequency power transmission system. Real-time response of low-frequency power grid angular frequency to power-frequency power grid angular frequency is realized by using an onshore M3C converter; the active power response of the low-frequency fan to the angular frequency of the low-frequency power grid is realized by utilizing a low-frequency fan side converter and a grid side converter; through cooperative control of the M3C converter and the low-frequency fan, active support of the offshore wind power low-frequency power transmission system for frequency fluctuation of an onshore power frequency power grid can be realized, the system stability is improved, and the method has a good application prospect.

The invention discloses an anti-settlement method and system for a conjoined building with asynchronous foundation construction. The method comprises the following steps: step 1, establishing a multi-stage coupling settlement prediction finite element model of the conjoined building; 2, a settlement active control system composed of a central control unit, a distributed sensor network and a servo hydraulic actuator array is arranged at the structure connection interface of the asynchronous construction areas of the connected building; 3, in the whole construction process, relative settlement data of all the areas are continuously monitored in real time; 4, comparing the real-time settlement data with the prediction model data, and calculating a deviation value; and 5, according to the deviation value, the needed active supporting force is calculated, the servo hydraulic actuator array is instructed to adjust the output force of the servo hydraulic actuator array in real time, and therefore differential settlement in the construction process is actively controlled within the preset minimum threshold value range. According to the invention, the internal stress of the structure is greatly reduced, and a long waiting period required by technologies such as post-cast strips is canceled.

The invention discloses a network construction type VSG power grid fault active support cooperative control method, and belongs to the technical field of new energy grid-connected control. According to the method, the power grid voltage is monitored in real time, and a cooperative strategy is dynamically triggered: when the voltage drops below a set value, a cooperative control mechanism is started, including (1) self-adaptive active power adjustment based on a power angle stability margin and dynamic correction of a power instruction value to suppress kinetic energy accumulation of a rotor; (2) voltage tracking type reactive compensation is superposed in a reactive control loop, reactive current is increased in real time according to the drop depth, continuous reactive support is provided, and steady-state overcurrent is restrained; and (3) inputting a virtual resistance inductor, and limiting a transient over-current peak value by suppressing a dq-axis coupling current component. When the voltage is normal, the conventional VSG control mode is maintained. According to the invention, power-reactive power-impedance three-dimensional cooperation is realized, power angle stability, current limitation and voltage support are considered, and the stability and active support capability of the network-forming VSG under the power grid drop fault are significantly improved.

The invention discloses an anchor rod and grouting combined reinforcement control method for surrounding rock of an argillaceous weak cemented roadway, relates to the technical field of coal mine roadway support, and solves the problems of poor anchoring performance of an anchor rod, insufficient grouting pertinence and poor grouting and anchoring collaboration in the prior art. According to the technical scheme, the method comprises the steps that grouting and supporting parameter collaborative design is conducted; after roadway tunneling, full-section concrete spraying sealing is immediately carried out; deep and shallow hole step-by-step differential grouting is conducted, shallow hole low-pressure permeation is conducted firstly to form a shallow reinforcing ring, and then deep hole high-pressure splitting is conducted to form a deep reinforcing area; and finally, high-pretightening-force anchor rods (cables) are installed to form a cooperative bearing body. The reinforcing ring layer with the reasonable strength gradient is formed, efficient cooperation of surrounding rock modification and active supporting is achieved, and the supporting reliability and the overall stability of surrounding rock are remarkably improved.

The invention belongs to the related technical field of direct current power transmission of a power system, provides an active support control method and system suitable for an offshore wind power direct current delivery system, overcomes the defect that active power is borne by a hybrid MMC when a traditional flexible direct current system active support control strategy is transplanted to a DR-hybrid MMC topology, and particularly solves the problem that when the hybrid MMC runs at zero direct current voltage, the active power cannot be borne by the hybrid MMC. The hybrid MMC can be prevented from increasing the active power transmitted by the hybrid MMC, the rated capacity of the hybrid MMC is reduced, and the economic benefit of the system is improved. The frequency and voltage supporting capacity of the DR-hybrid MMC series topology direct current sending-out system for the receiving end power grid is effectively improved, and the stability of the power grid is enhanced in the scene that high-proportion new energy is connected into the power grid.

The invention relates to an energy storage active support control method, device and equipment, a medium and a program product, and the method comprises the steps: carrying out the adaptive adjustment of a first control parameter of a virtual synchronous generator based on the output angular frequency of the virtual synchronous generator, and determining the power grid angular frequency deviation value of a power grid system based on the power grid angular frequency of the power grid system, constructing a prediction equation aiming at the power grid angular frequency deviation value at the future moment, constructing a cost function by taking the power grid angular frequency deviation value at the future moment and the output power compensation value at the current moment as variable parameters, and determining the minimum cost value corresponding to the cost function as an optimization target; and performing optimization solution on the pre-obtained target function based on the first control parameter to obtain an output power compensation value at the current moment, thereby improving the dynamic response capability of the network-building energy storage technology, timely and effectively tracking and compensating system changes, and simultaneously considering the cost adjustment and enhancing the inertia support and frequency adjustment capability of the power system.

The invention provides a multi-micro-grid cooperative active support control method, which belongs to the technical field of micro-grid cooperative control, and comprises the following steps: classifying micro-grids as energy providers or consumers according to positive and negative net power values of each micro-grid in a micro-grid cluster system; an energy transaction model based on the non-cooperative game is established, the consumer microgrid serves as a participant, the electricity purchase price serves as a strategy variable, and economic benefits serve as an optimization target; designing a dynamic energy distribution rule, and dynamically adjusting an energy distribution proportion according to a supply-demand relationship; obtaining a priority factor of a micro-grid of a provider, and optimizing an energy distribution sequence; judging whether the non-cooperative game energy transaction model has a Nash equilibrium solution or not; and solving the Nash equilibrium solution to obtain an optimal energy scheduling scheme. The method has the advantages that on the basis of the non-cooperative game theory, the N micro-grid energy transaction models are established and gather each other in the bidding process, so that own benefits are maximized, power grid impact can be effectively avoided, and the active supporting capacity and stability of the system are improved.

The invention relates to the field of surrounding rock stability control of deep-buried roadway engineering, in particular to a surrounding rock stability control method based on a rigidity coupling mechanism, which comprises the following steps: measuring rock physical and mechanical parameters, investigating joint fissures in an engineering area, obtaining rock mass quality grades, calculating the deformation modulus of the rock mass in the engineering area, and designing an active support of the rock mass in the engineering area. And calculating the surrounding rock deformation modulus after supporting by combining the rock deformation modulus, and carrying out passive supporting design on the rock in the engineering area according to the surrounding rock deformation modulus after active supporting. By calculating the overall deformation modulus of surrounding rock after supporting and designing parameters such as passive supporting concrete proportion, an active supporting system and a passive supporting system have the same or similar deformation stiffness, and it is ensured that the two supports can synchronously coordinate deformation and share loads together; the risks of stress concentration and one-by-one failure of the supporting units caused by rigidity difference are effectively avoided, and the supporting reliability is improved.

The invention relates to the technical field of roadway supporting, and provides a soft rock dynamic pressure roadway supporting method adopting a combined supporting device, which comprises the following steps: S1, prefabricating a connecting piece 5 and a supporting unit; s2, performing double-gradient grouting on the surrounding rock of the roadway; s3, a roadway surrounding rock anchoring system is constructed; s4, mounting a bearing plate on the surrounding rock of the roadway; s5, the connecting pieces and the multiple supporting units are spliced according to the section shape of the roadway to form a rectangular roadway combined supporting device or a three-star-arch roadway combined supporting device; s6, a displacement sensor, a pressure sensor group and a controller are installed; step S7, floor heave construction; and S8, dynamic support regulation and control. According to the combined supporting device, active supporting, real-time monitoring, dynamic compensation and bottom plate reinforcing are integrated, and the problem of multi-dimensional deformation of the extremely soft rock dynamic pressure roadway is solved through structural innovation and construction process optimization.

The invention provides a method for controlling the surrounding rock stability of a weathered and expanded soft rock roadway, and belongs to the technical field of underground mine roadway surrounding rock control. The method comprises the following steps: spraying a macromolecular waterproof material on the whole section of the surrounding rock surface of the roadway to form a water-resisting layer to prevent water vapor from infiltrating into the surrounding rock; a graded supporting structure is arranged in a roadway, and an active supporting layer with shallow anchor rod reinforcement and deep anchor cable suspension cooperating with each other is formed; spraying steel fiber reinforced concrete on the surface of the active support layer of the roadway to form a passive support layer coupled with the active support layer; the bottom face of the roadway is excavated into an arch wave face, a plane corresponding to the arch wave face is an arch plate face, an anti-arch space is defined by the arch wave face and the arch plate face, gravel concrete is poured into the anti-arch space, and an anti-arch structure is formed at the bottom of the roadway. The method can effectively control deformation and instability of the surrounding rock, solves the problems of waterproof failure, support system mismatch and floor heave out-of-control of the easily-weathered expansion soft rock roadway, and realizes long-term safety and stability of the easily-weathered expansion soft rock roadway.

The invention provides an active support self-adaptive control method for a network construction type converter. The active support self-adaptive control method for the network construction type converter comprises the following steps: S01, calculating a frequency difference value and a frequency change rate value of the network construction type converter; s02, calculating an inertia coefficient according to a frequency change degree comprehensive threshold value; s03, calculating a damping coefficient according to the frequency difference threshold value; s04, realizing active support control by simulating the characteristics of a synchronous machine; and S05, performing pulse width modulation on the internal potential through vector control. According to the active support self-adaptive control method for the network construction type converter, main parameters are self-adaptively adjusted according to the external environment of the system to suppress power and frequency fluctuation, the method can be suitable for the operation occasion of a power electronic converter, and particularly, the steady state of the network construction type converter is not influenced by external disturbance; therefore, the active support control performance of the converter is improved.

The application discloses a kind of active support control method, device and medium of wind turbine, it is related to wind turbine active support control technical field, for the problem that current power grid voltage fault cannot identify power grid parameter, and then active support control effect is not good, provide a kind of active support control method of wind turbine.The voltage and current data of grid-connected point before and after power grid failure are collected to determine the parameter change of power grid before and after voltage failure.Furthermore, the short-circuit point position, short-circuit current and transition resistance value are identified, and the determination of all unknown quantities in the wind turbine grid-connected point voltage model after failure is realized.At this time, all parameters in the wind turbine grid-connected point voltage model after failure are known, the equivalent voltage and equivalent impedance of the power grid after failure can be determined, and the power grid parameter identification during failure is completed.Based on the identified power grid parameters during failure, the active and reactive output current optimal proportion of wind turbine can be redesigned, and better support for power grid voltage recovery effect is brought.

This application provides a tunnel boring machine (TBM) and its control method, relating to the field of engineering machinery technology. The TBM includes: a cutterhead; the cutterhead is disposed at one end of a shield; at least one advance support assembly is disposed within the shield, and the advance support assembly has multiple support members; the advance support assembly is configured to, depending on the surrounding rock condition in front of the cutterhead, selectively extend the multiple support members from within the shield to above the cutterhead to form a temporary support zone, or drive the support members to retract from above the cutterhead back into the shield. According to the embodiments of this application, active support for the surrounding rock above the cutterhead is achieved through the advance support assembly based on the surrounding rock condition, and the machine does not need to be stopped during support, enabling continuous and rapid traversal of deformable surrounding rock sections, thus improving the TBM's adaptability to complex terrain, tunneling capacity, and tunneling efficiency.

The invention relates to a Tripteron-type parallel manipulator configured to provide three purely translational degrees of freedom by means of three orthogonal linear actuators and their respective parallelogram-shaped kinematic chains. The system incorporates an auxiliary active support arranged on the Z-axis, intended to apply an upward vertical force to the moving platform (11) in order to reduce the load borne by the kinematic chain and the main Z-axis actuator. This support can be implemented using electric or pneumatic actuators, elastic elements, or cable-driven mechanisms, allowing for active, passive, or semi-active operating modes.The integration of the auxiliary support increases the manipulator's load capacity, improves its dynamic stability, and reduces the mechanical demands on the vertical actuator, while maintaining the purely translational kinematics and structural characteristics of the original Tripteron unchanged.

The utility model relates to the technical field of underground engineering, in particular to an underground engineering toughness supporting structure and underground engineering. The tough supporting structure for the underground engineering comprises a surrounding rock toughening layer which is grouted or sprayed on surrounding rock of the underground engineering in a rotary mode; the fiber sprayed concrete primary support layer is sprayed on the excavation contour surface of the underground engineering; the anchor rod or the anchor cable is driven to the surrounding rock of the underground engineering from the fiber sprayed concrete primary support layer; the telescopic arch frame is erected in the fiber sprayed concrete primary support layer; the buffer layer is laid or sprayed on the inner side of the fiber sprayed concrete primary support layer; and the self-repairing secondary lining layer is laid on the inner side of the buffer layer. A traditional passive supporting technology is changed, the toughness of the supporting structure is systematically improved in the mode of structural toughening, active supporting and graded deformation, and the whole structural system is better in deformation adaptability, higher in bearing capacity and higher in disaster resistance.

The application provides an active support type extra-high voltage direct current transmission system, comprising a judgment module, when a frequency variation of a receiving end AC power grid is greater than or equal to a first frequency reference value, power instructions of a receiving end flexible direct current valve are switched from being output by a direct current voltage controller to being the power value of the receiving end within a latch time before switching; a first switching module switches a control mode of a direct current direct hanging super capacitor valve from a constant current control mode to a direct current voltage control mode, and provides the required power for frequency support of the receiving end power grid. The application also provides an active support type extra-high voltage direct current transmission control method. The active support type extra-high voltage direct current transmission system and the control method provided by the application can realize frequency support of the receiving end power grid under the premise that the sending end power is unchanged.

The application discloses a frequency active support strategy based on a wind storage system, and is characterized in that the method comprises the following steps: S1, wind speed partitioning; S2, frequency dead zone correction; S3, unit reactive power compensation; and S4, determination of a cooperative control strategy; the wind speed interval in which a wind turbine is located is determined according to the operation state of the wind turbine, and power adjustment is performed on the wind storage system to realize frequency support; in the meanwhile, the system frequency secondary drop caused by wind turbine power recovery, load fatigue caused by frequent action of a pitch angle mechanical component, and economic loss caused by limited power frequency modulation to wind farm grid-connected operation are avoided.

The invention belongs to the technical field of receiving-end power grid evaluation, and particularly relates to a receiving-end power grid active support capability evaluation method and system based on the total risk potential of a system, and the method comprises the steps: firstly constructing an active support capability evaluation index system of a receiving-end power grid; then calculating an individual risk potential function of each index and a coupling risk coefficient between each index and other indexes, and then calculating a system total risk potential based on the individual risk potential function and the coupling risk coefficient, the system total risk potential including a system individual risk potential and a system coupling risk potential; and finally, active support capability evaluation of the receiving-end power grid is realized based on the total risk potential of the system. According to the method, on one hand, a scientific and comprehensive evaluation system is constructed, the deep evaluation of the active support capability is realized, on the other hand, on the basis of quantifying the deviation degree by using the individual risk potential, the non-linear superposition risk additionally generated by the interaction or simultaneous degradation among multiple indexes is quantified through the coupling risk potential field, and the evaluation accuracy of the active support capability is improved. And the diagnosis precision is obviously improved.

The application discloses a wind turbine equivalent inertia estimation method based on frequency dynamic response equivalence, which dynamically equivalent the frequency change of a system supported by a wind turbine to the frequency change of a system with equivalent inertia increased, and the equivalent inertia of the wind turbine is the inertia of the system after equivalence minus the inertia of the synchronous machine before equivalence. Compared with the traditional equivalent inertia evaluation of the power system, the method provided by the application can quantify the equivalent inertia of the wind turbine under different active support methods, and provides an auxiliary decision for the dispatching operation of the power grid.

The application relates to a new energy station active support control performance evaluation method, which comprises the following steps: determining a first index of a new energy station active support control performance index system configured with energy storage, and constructing a second index based on the first index; determining the weights of the first index and the second index, calculating a new energy station active support control performance value based on the weight values of the first index and the second index, and realizing new energy station active support control performance evaluation. The application can reflect the active support capability of the new energy station and has a high credibility.

A method for determining the working resistance of a unit support in the advance section of a mining roadway includes the following steps: S1, collecting geological parameters of the overlying strata in the advance section of the roadway to be tested and determining the load on the roadway; S2, classifying the roadway into six types based on the lithology of the roadway roof, the structure of the roadway roof, whether the roadway is affected by impact, and whether the roadway is along the goaf; S3, calculating the surrounding rock load in the advance section for each of the six types of roadways; S4, calculating the roadway bearing capacity for each of the six types of roadways; S5, calculating the rated working resistance of the unit support for each of the six types of roadways. The method described in this invention comprehensively considers all possible load sources that the unit support may bear, as well as the active support provided by the roadway anchor cables, maximizing the stability of the active support system for the roadway. It can accurately calculate the working resistance of the unit support under different roadway types and support conditions, providing systematic guidance for the scientific use of the unit support throughout the entire process, ensuring that the working space is in a safe zone, and reducing safety hazards.

The invention discloses a hybrid wind power plant frequency active supporting method, system, equipment, medium and product considering cooperation of a following network type fan and a construction network type fan, and relates to the field of wind power generation. The method comprises the steps that when the frequency deviation of a power grid exceeds a frequency deviation threshold value or the frequency change rate exceeds a frequency change rate threshold value, the frequency change rate of the power grid exceeds a frequency deviation threshold value; calculating the total required power support increment of the power grid; calculating the real-time supportable power capacity of the following-net type fan and the net-constructing type fan in the hybrid wind power plant; based on the total required power support increment and the real-time supportable power capacity, distributing a power support instruction by adopting a collaborative optimization principle; based on the power support instruction, generating a control instruction of the following net type fan and the construction net type fan; and the output power of the following net type fan and the construction net type fan is adjusted based on the control instruction, and frequency support is provided. According to the method, the active frequency support requirement of the wind power plant mixed with the following / constructing network type fans can be met, the following / constructing network type fans are enabled to synergistically exert respective advantages, and the optimal frequency support is realized.

This invention discloses a method for improving the active support capability of a doubly-fed wind turbine under asymmetric faults. This method establishes an optimization model for a doubly-fed wind turbine with the goal of minimizing voltage imbalance at the common connection point. The optimization problem is delimited into two sub-optimization problems: one in which the negative-sequence voltage can be eliminated and the other in which it cannot. By using the Karush-Kuhn-Tucker condition and geometric analysis to shrink the constraints, an analytical solution for the rotor's positive and negative sequence current commands is obtained. This method overcomes the problem of insufficient unbalanced voltage suppression capability under asymmetric faults in doubly-fed wind turbines, thereby significantly reducing voltage imbalance at the common connection point under asymmetric faults. This method provides a reference for improving the active support capability of doubly-fed wind turbines under asymmetric faults.

The invention discloses an active support control method and device for a grid-connected system containing a virtual synchronous machine. The method comprises the following steps: acquiring a grid-connected point voltage amplitude of each virtual synchronous generator in a grid-connected system and reactive power injected into the grid-connected system based on a wide-area measurement system; performing preliminary support control on the grid-connected system according to the grid-connected point voltage amplitude and reactive power of each virtual synchronous generator and a preset stability criterion set; determining a key branch of the grid-connected system after the grid-connected system is subjected to preliminary support control; and judging whether the branch parameters of the key branch meet a preset key branch criterion or not, if so, proving that the grid-connected system is recovered to be stable, otherwise, searching a minimum cut set range containing the key branch, and taking an active splitting measure on the branch in the minimum cut set range.

This invention discloses a robot and method for installing spacer bars. The spacer bar installation robot includes a frame and a walking mechanism, a storage mechanism, a transfer mechanism, and a clamping mechanism mounted on the frame. The storage mechanism includes symmetrically arranged support rods and extension rods, with an anti-detachment block at the rear end of the extension rods. The transfer mechanism includes a receiving mechanism, a pushing mechanism, and a moving mechanism; the receiving mechanism has a vertical linearity module, a receiving platform, and a receiving rod. When the receiving rod rises to the same height as the support rod, it is aligned with the extension rod, supporting the movable and fixed buckles of the spacer bar respectively. The pushing mechanism pushes the spacer bar from the support rod to the receiving rod, the receiving rod descends to the height of the conductor, the moving mechanism pushes the spacer bar to the installation position, and the clamping mechanism closes the latch. This invention, through active support and precise transfer throughout the process, avoids attitude deviation caused by gravity falling, thus improving the accuracy and success rate of spacer bar installation.

The application provides a new energy station group fault ride-through control method considering active and reactive power collaborative support, comprising the following steps: when a fault occurs in a station group, dividing fault branches and non-fault branches according to whether the fault station is included; constructing a post-fault station group model based on the Thevenin equivalent method, wherein the post-fault station group model comprises a first equivalent current source corresponding to a system between a fault point and a grid connection point of a fault branch, and a second equivalent current source corresponding to a system between a non-fault branch and the grid connection point; based on the post-fault station group model, obtaining first active current active support instructions and first reactive current active support instructions by using a station current limit utilization method, and controlling the station group. The method optimizes the collaborative support of active power and reactive power for the new energy station group, reduces the active power shortage of the station group during the fault under the premise of fully utilizing the controllable capacity and overcurrent capacity of each station, and ensures the safe and stable operation of the power system.

The invention discloses a mining hydraulic support. The mining hydraulic support comprises a supporting part, a control part and a support part. One end of a top beam of the supporting part is connected with a shield beam hinged to the support part, and the other end of the top beam provided with the face guard is covered with a buffer shield. The control part comprises a pushing module, a deflection module and an obstacle removing module. And the pushing module is connected with the support part and the top beam through a first hydraulic cylinder. A first motor of the deflection module extends out of a first rotating shaft in the direction approximately parallel to the top beam. The obstacle removing module comprises a rock breaking mechanism and a conveying mechanism; the rock breaking mechanism swings through a first mounting bracket fixedly connected to the first rotating shaft, and a second motor on the first mounting bracket extends to form a second rotating shaft with a stirring piece; and the second motor also realizes lifting through a second hydraulic cylinder. The conveying mechanism comprises a third motor and a conveying belt wound around an output shaft of the third motor and the top beam. According to the hydraulic support, the local damage risk is reduced through the arrangement of the buffer protective cover, and the supporting capacity is enhanced through active supporting and active obstacle removing.

The application discloses a kind of deep foundation pit active compensation support design methods of soil and rock combination stratum, belong to geotechnical mechanics field, first carry out geological survey to the excavation foundation pit, then carry out support scheme design based on obtained geological exploration parameter, and according to whether using long and short anchor cable support and double gradient grouting technology etc., combined with engineering actual design monitoring scheme;And creatively adopt anchor cable construction mode, combined with high pre-tight NPR anchor cable, W steel band etc. Measure, complete the point-line-surface active support of high prestress compensation to foundation pit excavation face.This scheme abandons traditional passive support mode, but takes active compensation mode, according to the stress lost after actual stratum excavation, carries out support parameter design to high prestress NPR anchor cable, realizes the compensation measure to foundation pit, and according to fault, fracture zone etc. Geological condition encountered in actual foundation pit construction process, respectively proposed corresponding support measure, improved foundation pit compensation support design scheme.

The invention discloses a lighting lamp with unfoldable supporting legs. The lighting lamp comprises a lamp body, trundle assemblies and supporting leg assemblies. The lamp body comprises a control seat body, a lifting push-pull rod and a luminous body; the lifting push-pull rod is erected on the control seat body, the luminous body is arranged on the lifting push-pull rod, and the luminous body realizes lifting motion based on the lifting push-pull rod; the trundle assembly and the supporting leg assembly are arranged at the bottom of the control seat body; the supporting leg assembly comprises a driving supporting leg and a driven supporting leg, a containing groove is formed in the bottom of the control base body, and the driving supporting leg and the driven supporting leg can be contained in the containing groove and can be unfolded out of the containing groove based on split type rotation. According to the illumination lamp, on one hand, a worker does not need to bend down to conduct manual operation to achieve unfolding or storage of the supporting legs, on the other hand, in the storage process of the supporting legs, the worker can be effectively guided, the worker can rapidly judge the correct storage sequence, and therefore the supporting legs are rapidly stored.

The present application relates to the field of rehabilitation equipment. The purpose is to provide a traction system for orthopedic rehabilitation, comprising a lying plate, the middle part of the lying plate is provided with a concave mounting cavity, the mounting cavity is provided with a thigh support plate, the lying plate on both sides of the thigh support plate is respectively provided with a hip support area and a foot support area; the foot support area is provided with a moving plate which can move along the length direction of the lying plate under the drive of a drive mechanism, the moving plate is provided with a foot pedal for fixing the foot of a patient; the thigh support plate can swing obliquely upward around the center line of the plate shaft when the moving plate moves toward the hip support area to form support for the thigh of the patient. When the present application is used for knee joint rehabilitation traction of a patient, it can form active support for the thigh of the patient, guide the bending direction of the thigh and the calf, and reduce the impact on the knee joint.