488 results about "Planetary gearbox" patented technology

A drive arrangement for manipulating a vehicle control surface, comprises: a first drive; a second drive; an output member for connecting to the vehicle control surface; first engaging means for selectively engaging and disengaging the first drive and the output member; and second engaging means for selectively engaging and disengaging the second drive and the output member, wherein the first engaging means comprises a first epicyclic gearbox.

The invention discloses a high-reliability planetary gearbox signal denoising method, system, medium and equipment, and the method comprises the steps: obtaining original vibration signals of a nuclear power circulating pump planetary gearbox in different health states, and carrying out the detrending and demean preprocessing of the signals; performing modal decomposition on the original vibration signal by adopting an empirical mode decomposition (EMD) algorithm, an ensemble empirical mode decomposition (EEMD) algorithm and a variational mode decomposition (VMD) algorithm to obtain a plurality of different modal components; iteratively optimizing a hyper-parameter value in the variational mode decomposition algorithm VMD by adopting a sparrow search algorithm SSA so as to realize the self-adaptive decomposition of the variational mode decomposition algorithm VMD on the signal; and carrying out modal decomposition on the gearbox vibration signal by adopting a variational modal decomposition algorithm VMD after iterative optimization, removing noise components in modal components, and reconstructing the signal to realize gearbox vibration signal denoising.

The invention provides a planetary gearbox fault diagnosis method based on time-frequency statistical feature fusion and CNN, and the method comprises the steps: carrying out the fault diagnosis of a to-be-diagnosed planetary gearbox based on a pre-trained optimal fault diagnosis model; the pre-training step comprises the steps that vibration acceleration signals of the planetary gearbox in different states are collected; intercepting a sample from the vibration acceleration signal; extracting time domain statistical features and frequency domain statistical features of the samples; splicing the time-domain statistical features and the frequency-domain statistical features to obtain a time-frequency statistical feature sample; dividing the time-frequency statistical characteristic samples into a training set, a verification set and a test set; training a CNN network model based on the training set; determining an optimal fault diagnosis model from the trained CNN network model based on the verification set; and comprehensively evaluating the trained and debugged CNN network model based on the test set. By using multi-source sensor data, the limitation of single sensor information is effectively overcome, and the generalization of the diagnosis system is improved.

The invention discloses a planetary gear system digital twin model updating method based on deep reinforcement learning. The planetary gear system digital twin model updating method comprises the steps of S1, simplifying a planetary gear system; s2, describing the kinetic model by using a lumped parameter method, and constructing a planetary gear train oscillatory differential equation set; s3, a frequency response function family is calculated through finite element analysis, and a planetary gearbox rigid-flexible coupling model, namely a digital twinborn body, is constructed; s4, vibration response of the planetary gearbox shell under the stable rotating speed is obtained through a vibration signal collecting device; s5, defining an action space and a state space, and establishing a reinforcement learning environment; s6, solving the oscillatory differential equation set to obtain a simulation response, and constructing a reward function according to the simulation response; step S7, setting neural network parameters; step S8, optimizing by using a deep reinforcement learning algorithm; and step S9, loop iteration is carried out, the optimal physical parameters of inversion are output, and updating of the digital twinborn body is realized.

The invention provides a compound uniform-load and shunt load shedding type planetary gear gearbox with a face gear. The compound uniform-load and shunt load shedding type planetary gear gearbox comprises an input planet carrier integrated assembly, a first-stage compound uniform-load planet row, an inter-stage flexible connection structure, a second-stage planet row and a face gear steering output assembly. The input planet carrier integrated assembly is connected with the first-stage compound uniform-load planet row, the inter-stage flexible connection structure is arranged between the first-stage compound uniform-load planet row and the second-stage planet row, and a first-stage floating sun gear in the first-stage compound uniform-load planet row and the main shaft planet carrier structure are coaxially arranged. The first-stage floating sun gear is installed in a floatable mode through a first-stage sun gear supporting shaft, self-adjustment can be achieved in the radial direction and the axial direction, and the first-stage floating sun gear is meshed with the first planet gear and the second planet gear in a double-side mode. The energy conversion efficiency can be improved, uneven load distribution is improved, and the system integration degree is improved.

The invention relates to a method and system for estimating life of a planetary gearbox (100). The system comprises an arrangement of sensors (S1 – S8) for obtaining field operational data relating to loading and speed of components of the gearbox and a processing unit (150) configured to execute method steps of the invention comprising: i) receiving sensors signals during a series of time intervals t; and for each time interval t ii) calculating a distance travelled Li by each gear (105, 107, 110) and each bearing (115) of the gearbox, based on the received sensor signals; iii) calculating the load acting on each bearing and on each, based on the received sensor signals; iv) calculating a scale parameter Ai of a Weibull distribution associated with the life of each gear and bearing, based on a probabilistic life that is determined from the load calculated in step iii) and a known rating for each of these components, to obtain an operating condition severity (F), where ki is a known shape parameter of the Weibull distribution; v) calculating a used capacity ci(t) of each bearing and each gear by summing the operating condition severity (F) obtained for each time interval multiplied by the distance travelled Li by the component during the associated time interval, and vi) calculating a used capacity C(t) for the gearbox, based on the used capacity calculated for each component in step v) and on a shape parameter ks of a Weibull distribution associated with the life of the gearbox. A remaining useable capacity of the gearbox (100) may be determined from the calculated used capacity C(t), which is turn may be used to estimate a remaining useable life of the gearbox.

A planet carrier arrangement for a planetary gear system comprises a planet carrier (63) having a first support element (631) and a second support element (632) axially spaced from the first support element (631), a number of planet gears (62), and a coupling recess (634) in which a number of circumferentially spaced internal gear sectors (635) are provided. A number of support sections (636) are provided circumferentially between the internal gear sectors (635), the support sections (636) being located at least partially radially within an effective diameter of the internal gear sectors (635).Furthermore, an output element (71) is provided, to which a rotation of the planetary gear can be transmitted, wherein the output element (71) can be attached to the coupling recess (634) of the planet carrier (63) such that internal gear sectors (635) of the planet carrier (63) engage with external gear sectors (711) of the output element (71) to transmit a torque. The planet carrier arrangement is applicable in a drive system for a muscle-powered vehicle.

A planetary gearbox includes a housing having a pair of stops, a planet bearing mounted in the housing, and a planet gear rotatable on the planet bearing. The planet bearing is formed from an axially aligned planet pin and a thrust washer. The thrust washer includes two integrally-formed projections, each facing one of the stops to prevent rotation of the thrust washer about the planetary axis. The thrust washer also includes first thrust surfaces disposed on a first side of the thrust washer facing the housing, first lubrication channels formed axially opposite the first thrust surfaces and extending radially outwards, second thrust surfaces circumferentially offset from the first thrust surfaces and disposed on a second side of the thrust washer facing the planet gear, and second lubrication channels formed axially opposite the second thrust surfaces and extending radially outwards.

Disclosed herein is an integrated in-line emergency lube pump assembly for a planetary gearbox, including a main lube pump, a coaxial lube pump coaxially aligned with and coupled to the planetary gearbox, and an oil tank having a main section and an auxiliary section. There is no physical boundary between the main section and the auxiliary section of the oil tank. When the detected pressure in the oil supply line is equal to or exceeds a predetermined pressure threshold, the main lube pump operates to causes the main pump to pump oil from the main section of the oil tank to the planetary gearbox. Alternatively, when the detected pressure in the oil supply line is less than the predetermined pressure threshold the main lube pump ceases operation to cause the coaxial lube pump to draw oil from the auxiliary section of the oil tank to the planetary gearbox.

The invention relates to the technical field of fault diagnosis, in particular to a sun gear fault tooth positioning method based on combination of rotor sensing and tidal period effect, which comprises the following steps of: fixing a sensor module on an input shaft of a planetary gear box through a thermocouple adhesive, establishing a reference frame of a fixed shaft system and a rotating coordinate system, collecting radial vibration signals, and determining the radial vibration signals; mathematical modeling analysis is carried out on the collected radial vibration signals, and low-frequency components of the vibration signals are extracted by using a low-pass filter and can be used as absolute phase reference signals; the method comprises the following steps: performing time domain compensation on a meshing event of a sun gear and a single planetary gear by calculating meshing dynamic excitation time offset of the sun gear and simplifying a gearbox model, and ensuring the integrity of the single-tooth meshing times of the sun gear in a complete meshing period, so as to accurately analyze the meshing characteristics of each single tooth of the sun gear and the planetary gear; a sun gear fault working condition is simulated through an experiment, and periodic change of fault tooth meshing is analyzed; deterministic components and random components in the vibration signals are separated through cepstrum analysis; a band-pass filter is used for extracting gear meshing components from deterministic components; a minimum entropy deconvolution filtering technology and a square envelope technology are used for carrying out fault feature enhancement on random components; finally, absolute phase reference provided by gravitational acceleration of a rotor perception sensor is used, and a tidal period effect is combined; and calculating a single-tooth meshing frequency code of the fault tooth lag absolute phase reference point, and determining the position of the fault tooth by using different codes corresponding to different fault positions. The complexity of the monitoring system is effectively reduced, the influence of monitoring equipment on the operation of the planetary gear box is reduced, and the fault positioning accuracy of the sun gear is effectively improved.

The invention relates to the technical field of reducer vibration noise optimization, and discloses a planet row coaxial reducer vibration noise optimization method, which comprises the steps of obtaining initial assembly parameters of a reducer, collecting load measurement signals of planet wheels of the reducer under an order frequency sweeping working condition, converting the load measurement signals into equivalent meshing loads based on a calibration curve, and calculating the equivalent meshing loads according to the equivalent meshing loads. Calculating a load imbalance coefficient according to the equivalent meshing load, and taking a peak value of the load imbalance coefficient as a first evaluation index; shell radial acceleration and sound pressure signals are synchronously collected under the order frequency sweeping working condition, the side-band ratio is calculated, and the peak value of the side-band ratio is taken as a second evaluation index; and performing diagnosis shunting based on the first evaluation index and the second evaluation index, determining an assembly parameter which is adjusted preferentially, executing iterative adjustment, and outputting a final assembly parameter after iteration is completed. According to the method, uniform load unbalance caused by assembly errors and side band amplification caused by geometric eccentricity can be effectively separated and solved, and vibration and noise of the speed reducer are reduced fundamentally.

According to the planetary gear box fault diagnosis method based on order analysis and the time domain non-stationary model, a non-stationary vibration signal appearance model is established, and intelligent diagnosis of actual vibration signals of the gear box under the non-stationary working condition is achieved. The method comprises the following steps: firstly, proposing a manifestation model which considers modulation components and modulation intensity at the same time; for a variable speed signal, a signal model based on an angular domain order component is established. Secondly, accurately extracting a modulation order component by using a VMD method, providing a method for quantifying the contribution degree of the modulation component, and training and verifying the effectiveness of a modulation intensity coefficient; and finally, verifying the model through an actual gearbox signal, extracting an intensity coefficient, inputting the intensity coefficient into a support vector machine for classification, and completing fault diagnosis. The model is used for fault diagnosis of the gear box under the non-stable working condition, the modeling idea can be widely applied to modeling analysis of various rotating machines, and the fault diagnosis capability of the gear box in the actual complex environment is improved.

An oil collecting pan for a planetary gearbox includes a pan body and a retaining plate. The pan body includes a channel-like oil collection space and axially protruding, hollow oil feed ports which communicate with the channel-like oil collection space. The retaining plate extends radially into the channel-like oil collection space and runs at least partially circumferentially through the channel-like oil collection space. The retaining plate forms an oil retaining space within the channel-like oil collection space.

A battery-powered troweling machine is driven by an electric motor powered by a pair of twenty-four volt batteries coupled in series to drive a planetary gearbox to rotate a trowel blade assembly engageable with the surface of the poured concrete. The controls are carried by a detachable handle that is connectable with a receiver box that traps the handle between interior and exterior stops and uses over center clamps to maintain the handle in proper position within the receiver box. The controls at the rearward distal end of the handle can be used to vary the speed of rotation of the troweling assembly, to adjust the pitch of the individual trowel blades through an actuator and linkage assembly, to initiate actuation of the electric motor and to provide an emergency stop for the operation of the troweling machine.

The invention provides a planetary gearbox intelligent fault diagnosis method based on ITD and LSTM-CNN, and relates to the technical field of planetary gearbox fault diagnosis. The planetary gear box intelligent fault diagnosis method based on the I TD and the LSTM-CNN comprises the following steps that firstly, vibration signals of a planetary gear box are collected through a sensor, I TD decomposition is carried out on each sampling signal to obtain a plurality of PR components, the PR components with large instantaneous frequency fluctuation are selected through Hilbert transform, and the PR components with large instantaneous frequency fluctuation are obtained; converting the reconstructed signal into a frequency spectrum function through Fourier transform, extracting the amplitude of a feature frequency, constructing a feature vector, inputting the feature vector into an LSTM-CNN for intelligent diagnosis, and combining a classification cross entropy loss function to ensure the stability of calculation and the high efficiency of training. A comprehensive and efficient solution is provided for fault type and degree diagnosis of the sun gear of the gear transmission system, and compared with a classic neural network model, the diagnosis accuracy of different types of gear faults and different degrees of faults is improved.

The invention describes a handling apparatus (1) for use in a maintenance procedure of a wind turbine drivetrain (2, 4, 6) comprising a planetary gearbox (4) and a generator (6) coaxially mounted to the gearbox (4), which handling apparatus (1) comprises a suspension rail (10) dimensioned to extend from the interior of the generator rotor (64) outward to the exterior of the generator (6); a mounting means (100, 10F, 10B) for mounting the rail (10) to a stationary drivetrain part (42, 62, 64); at least one carriage (12) arranged to move along the underside of the suspension rail (10); and at least one lifting fitting (14, 140, 142) adapted for attachment to a drivetrain component (66, 68, 8, 44) and comprising a means of suspending that lifting fitting (14, 140, 142) from a carriage (12). The invention further describes a method of performing a maintenance procedure on a wind turbine drivetrain (2, 4, 6) using such a handling apparatus (1).

The present invention relates to a dual-motor two-speed non-power-interruption electric drive bridge, comprising a differential, an output shaft, and a motor drive unit; the output shaft comprises a left output half shaft and a right output half shaft, the differential has an input end and two output ends, one of the output ends is connected to the left output half shaft, and the other output end is connected to the right output half shaft, and the input end of the differential is connected to an intermediate shaft gear; the motor drive unit comprises two motor drive assemblies arranged in parallel on both sides of the output shaft, the motor drive assembly comprises a drive motor, a compound planetary gear, and a high-low gear reduction mechanism; the two high-low gear reduction mechanisms are both meshed with the intermediate shaft gear. Two sets of motor drive units respectively arranged on both sides of the output shaft are used to realize the input to the output shaft, and the two sets of motor drive units are independently operated. When one set of the motor drive units shifts gears, the other set still maintains the input to the output shaft, and sequential shifting is performed, thereby realizing the purpose of non-power interruption during the shifting process.

A change-speed gearbox for orthopedic devices has a planetary gearbox with at least one planet stage having a central sun gear, a plurality of planet gears rotatably mounted on a planet carrier which come into engagement with the sun gear, and has a ring gear which meshes with the planet gears. The sun gear can be coupled to a drive. The planet carrier is coupled to an output element. The ring gear is pivotably mounted in a ring gear carrier and is coupled to the ring gear carrier via a switchable freewheel.

The invention discloses a double-speed-ratio transmission planetary driving gearbox, which relates to the technical field of planetary gearboxes and comprises a pressurizing mechanism, a linkage mechanism and a positioning mechanism. According to the invention, online dynamic speed ratio switching of the planetary gearbox under the continuous operation condition is realized, a set of intelligent execution mechanism based on pneumatic driving and magnetic coupling is integrated in the input shaft, and a power transmission path is quickly changed from a high-speed direct connection mode to a high-speed direct connection mode to a high-speed direct connection mode. The planetary reduction mechanism comprising the sun gear, the planet gear and the gear ring locked by the positioning mechanism is seamlessly switched, the output rotating speed is remarkably reduced finally, the torque is multiplied finally, the whole switching process is smooth and rapid, transmission of input power does not need to be interrupted, and the switching efficiency is improved. The operation efficiency and the self-adaptive capacity of the equipment in the continuous technological process are greatly improved, and production interruption, capacity loss and extra energy consumption caused by frequent start and stop are fundamentally avoided.

The invention discloses a planetary gearbox fault diagnosis method based on time-varying modulation feature extraction. The method comprises the following steps: separating amplitude-modulated and frequency-modulated signals from original vibration signals through Hilbert transform; respectively generating time-frequency diagrams of amplitude-modulated and frequency-modulated signals by adopting multi-order synchronous compression transformation; extracting a fault related ridge line by using an adaptive multi-ridge line extraction algorithm; reconstructing the signal and carrying out non-uniform resampling in a time domain by using time warping; and analyzing the frequency spectrum of the amplitude-modulated and frequency-modulated signal after resampling, and confirming the specific fault type of the planetary gearbox under the working condition of the time-varying rotating speed. According to the method, the time-varying modulation characteristics of amplitude modulation and frequency modulation components in original signals can be extracted respectively, non-uniform resampling is carried out on time-varying signals in a time domain to eliminate interference of rotating speed fluctuation, and extraction of fault characteristics and fault diagnosis of the planetary gearbox under the time-varying rotating speed working condition are achieved.

The invention discloses a visual intelligent icing detection system for an overhead transmission line, and relates to the technical field of cable icing thickness detection. The photovoltaic solar panel and the wind power generation assembly are used for supplying energy, and low-energy-consumption operation is achieved; the diameter change of the cable is detected through the light shielding principle, and accurate measurement of the icing thickness is achieved; large-range dynamic detection is realized by combining the design of a traction roller and a planetary gearbox, and the system is compatible with various cable specifications, has an intelligent alarm function, can transmit icing information to maintenance personnel in real time, improves the safe operation efficiency of a power transmission line, and solves the problems of high cost and low precision of traditional manual detection.

The present disclosure relates to an outer-ring-free cylindrical roller bearing structure for a wind turbine gearbox, comprising: an inner ring, a first raceway and a second raceway being provided on the periphery of the inner ring; a first rolling body and a second rolling body, which are respectively located in the first raceway and the second raceway; and a first retainer and a second retainer, which are respectively used for circumferentially separating the first rolling body in the first raceway and the second rolling body in the second raceway, wherein the inner diameter of the first retainer is less than the diameter of a circle where the center of the first rolling body is located, the inner diameter of the second retainer is greater than the diameter of a circle where the center of the second rolling body is located, and the first retainer and the second retainer partially overlap in the axial direction. The two retainers axially overlap, and under the same axial dimension condition, such retainers can increase the lengths of the rolling bodies to the maximum extent, thereby maximizing the static bearing capacity of the bearing, so that a planetary gearbox achieves larger power density.

The invention relates to a gearbox fault diagnosis model construction method based on metric guide graph comparative learning, and belongs to the field of gearbox fault diagnosis model construction. The method comprises the following four core stages: firstly, carrying out frequency domain conversion and normalization on vibration signals of the gearbox to generate a node characteristic matrix; secondly, a cosine distance and an Euclidean distance are fused to construct a mixed distance matrix, and a fault diagnosis graph is generated based on a K-nearest neighbor algorithm; then unsupervised graph comparison pre-training is realized through graph data enhancement and a dynamic graph attention network (DGAT); and finally, weak supervision fine tuning is carried out by using a small number of marked samples to complete construction of the gearbox fault diagnosis model. According to the method, the construction of the high-precision gearbox fault diagnosis model can be realized in a scene with extremely few marked samples (1-10 samples per class), and the method is suitable for planetary gearbox health monitoring in the fields of wind turbines, helicopters, hybrid electric vehicles and the like.

An improved compound planetary gear system. In embodiments, a compound planetary gear system includes at least one planet pinion including a main shaft having a first gear for meshing with a sun gear and a second gear for meshing with a ring gear, and a carrier for supporting the at least one planet pinion. Teeth of the first gear are configured with a first helical angle with respect to a longitudinal angle of the at least one planet pinion, teeth of the second gear are configured with a second helical angle with respect to the longitudinal angle of the at least one planet pinion, the first helical angle different from the second helical angle.

The invention discloses geochemical sampling equipment and a using method thereof, and relates to the technical field of geological sampling, the geochemical sampling equipment comprises a sampling device base, the sampling device base is placed on geological soil, a lifting system is installed on the sampling device base, the lifting system is connected with a driving system, and the driving system is connected with the sampling device base. The bottom end of the driving system is connected with a hand-operating mechanism, a planetary gear box body mechanism is movably connected in the hand-operating mechanism, the output end of the driving system penetrates through the hand-operating mechanism and is in transmission connection with the planetary gear box body mechanism, and the output end of the bottom of the planetary gear box body mechanism is connected with a sampling drill bit. A collecting mechanism is connected into the planetary gear box body mechanism, and a cleaning mechanism is further connected into the planetary gear box body mechanism. According to the equipment, the planetary gear box body mechanism and the cleaning mechanism are combined, so that when the sampling drill bits cut soil, chippings can be collected and cleaned synchronously, and the collecting mechanism is of a surrounding type cleaning structure.

The invention discloses a high-temperature alloy part surface polishing system, and relates to the technical field of part polishing. A plurality of grinding sand backflow channels which are arranged in a circular array mode are arranged between the grinding sand storage barrel and the backflow collection chamber, and automatic circulation flowing of grinding sand is achieved. Therefore, waste of the polishing sand is avoided, and the utilization rate of the polishing sand is increased. By means of the sand discharging opening and the rotating effect of the grinding sand driving impeller, grinding sand can continuously circulate between the storage barrel and the backflow collecting chamber, the continuous grinding effect of the grinding sand on parts is effectively guaranteed, and therefore the grinding efficiency and the grinding quality are improved. Through coordinated work of the driving motor, the planetary gear supporting disc, the planetary gearbox, the multiple pressurizing pipes and other assemblies, precise control over the internal pressure of the pressurizing pipes is achieved. The rotating speed and the internal pressure of the pressurizing pipe can be adjusted according to different outline structures and materials of parts, and it is ensured that the extrusion force of the telescopic rod on the parts is appropriate.

The invention relates to the field of planetary gear box fault diagnosis, and discloses a planetary gear box fault diagnosis method, system, medium and equipment based on visual atlas feature fusion, and the method comprises the steps: collecting a normal state and a fault time domain signal during the operation of a planetary gear box through a pre-built planetary gear box working platform; carrying out Welch transformation on the time domain signal to obtain a power spectrum, and constructing a visibility graph map by adopting a visibility graph algorithm according to the power spectrum so as to extract centrality indexes of map nodes and fuse the centrality indexes into a feature matrix; the feature data is normalized and divided into a training set and a test set, a CNN-Inception model is trained based on the training set, the CNN-Inception model is checked by the test set, and the performance index is the accuracy rate of fault diagnosis; and after feature extraction is carried out on planetary gearbox signals collected in real time, the planetary gearbox signals are input into the trained CNN-Inception model for diagnosis. Effective feature information can be extracted, and the model diagnosis accuracy is improved.

The invention discloses a cross-working-condition fault diagnosis method and system for a planetary gearbox driven by digital-analog fusion, and the method comprises the steps: collecting a vibration signal, a rotating speed signal and a torque signal of the planetary gearbox, and carrying out the preprocessing of the vibration signal; monitoring the preprocessed data, and judging whether the working condition is changed or not; when the working condition changes, updating corresponding parameters of the kinetic model according to the acquired rotating speed signal and torque signal data, and generating simulation data matched with the current working condition; dividing the simulation data into an analog signal, a source domain signal and a target domain signal, inputting the analog signal, the source domain signal and the target domain signal into the first model, and training parameters in the first model; excessive classification is effectively avoided, unnecessary calculation burden is reduced, and it is ensured that the classification result can better reflect the real physical characteristics of the data; and meanwhile, through preprocessing, the capability of extracting cross-working-condition fault features by the first model is enhanced, and the robustness and generalization capability of classification of the first model are high.

The invention relates to a rechargeable brushless no-spark pipe cutting machine, which is applied to cutting coated stainless steel pipes, stainless steel pipes, thin steel wire conduits (EMT pipes), copper pipes and plastic pipes, and comprises a pipe cutting machine base, a damping cutting semi-automatic peeling mechanism, a charging device and a control handle. Two rollers are arranged on the surface of a pipe cutting machine base, and a direct-current brushless motor, a planetary gearbox and a PCB control module are arranged in the pipe cutting machine base. The damping cutting-off semi-automatic peeling mechanism is arranged above the pipe cutting machine base and connected with the planetary gearbox, and the damping cutting-off semi-automatic peeling mechanism is connected with the gear reduction mechanism; the charging device is arranged on the side edge of the pipe cutting machine base. The control handle is pivoted to the top end of the pipe cutting machine base and electrically connected with the PCB control module. Therefore, the coated foaming layer can be directly stripped and the stainless steel pipe can be directly cut at the same time, the operation time is effectively shortened, and the working efficiency can be obviously improved.

A lifting module 100 for a patient lifting system 300a, 300b is provided. The lifting module 100 being coupled to a drum 50 of the patient lifting system. The lifting module comprises a first electric motor 10 configured to drive the drum 50, a second electric motor 20 configured to drive the drum 50, a planetary gearbox 40 connecting the first 10 and second motor 20 to the drum 50, the planetary gearbox 40 being configured to transfer torque from the first 10 and / or second 20 motor to the drum 50 and a variable locking mechanism 30. The locking mechanism 30 is configured to being coupled to the second motor 20, wherein the variable locking mechanism 30 is configured to provide controlled deceleration of an output shaft 43 of the planetary gearbox 40 dependent on the movement of the patient 200.