2262results about "Centrifuges" patented technology

The invention relates to the technical field of centrifugal machine PID control, in particular to a centrifugal machine control method and system for soybean protein production. Obtaining time sequence data of the rotating speed and the torque of the centrifugal machine, analyzing data differences and fluctuation trends, calculating abnormal indexes of state parameters at all moments, accurately identifying abnormal data points and abnormal moments, and positioning rotating speed sudden change key nodes; determining an abnormal time period based on the time sequence characteristic of the abnormal moment, analyzing the relation between the rotating speed and the torque, the similarity of abnormal indexes and the rotating speed fluctuation characteristic in the time period, quantifying the dynamic relation between the two, and formulating an adjustment index; aiming at the problem of control lag caused by fixed parameters of the traditional PID, the PID parameters are dynamically adjusted by combining the abnormal index difference of the rotating speed and the torque at the current moment and the adjustment index determined in the early stage, so that the control strategy is adaptively optimized along with the change of the working condition, and finally, the stable, efficient and accurate control on the rotating speed of the centrifugal machine is realized.

Disclosed herein are cell processing systems, devices, and methods thereof. A system for cell processing may comprise a plurality of instruments each independently configured to perform one or more cell processing operations upon a cartridge, and a robot capable of moving the cartridge between each of the plurality of instruments.

To provide an improved system and method for balancing a centrifuge rotor.SOLUTION: A hub assembly 10 for a centrifuge rotor 12 includes a rotor hub 14 including a head portion 20, an elongated shaft portion 22 extending axially away from the head portion 20, and a central bore 102 extending through the head and shaft portions 20, 22. A system and method for balancing a centrifuge rotor 12 in which a head 20 includes a plurality of balance holes 52 each configured to selectively receive at least one balance weight 16 for balancing the centrifuge rotor 12.SELECTED DRAWING: Figure 4

The invention discloses a centrifugal system adaptive to bottom extraction, and relates to the technical field of solid-liquid separation, and the centrifugal system adaptive to bottom extraction is characterized by comprising a centrifugal machine main body, a rotating drum is arranged in the centrifugal machine main body, and a bottom extraction device is arranged at the bottom of the rotating drum; the dynamic sealing structure is arranged between the bottom extraction device and the rotary drum and used for keeping the sealing performance in the centrifugal process and preventing material leakage; the modular interface is connected with the bottom extraction device and the material collection container, so that quick replacement and adaptation to components of different specifications are facilitated; and the automatic control system comprises a sensor module, a PLC (Programmable Logic Controller) and a remote monitoring module, and is used for monitoring parameters including the rotating speed, the temperature and the pressure in the centrifugal process in real time and realizing automatic control.

The invention relates to the technical field of data processing, in particular to a centrifugal machine state online monitoring method and system. The method comprises the steps of collecting vibration data, temperature data and coal dehydration granularity data, obtaining the abrupt change degree of the vibration data of each vibration sensor at a feeding port and a discharging port of a screen basket at each moment, obtaining the vibration abnormity score in the operation process of the screen basket based on the abrupt change degree of the vibration data, and calculating the coal dehydration granularity according to the vibration abnormity score. Obtaining the temperature anomaly degree at each moment in the operation process of the screen basket, and obtaining the temperature anomaly score in the operation process of the screen basket based on the temperature anomaly degree; the particle size abnormal score in the operation process of the screen basket is obtained, the abnormal degree of operation of the screen basket is obtained according to the particle size abnormal score, the temperature abnormal score and the vibration abnormal score in the operation process of the screen basket, the abnormal operation state of the screen basket is judged according to the abnormal degree, and the accuracy of detection of the operation state of the screen basket of the centrifugal machine is improved.

The invention relates to the technical field of cell detection, and particularly discloses a physical detection and analysis device based on stem cell characteristics, the physical detection and analysis device comprises a detection mechanism arranged in an analyzer, the detection mechanism comprises mounting plates, the mounting plates are arranged in an annular array, and the ends, close to each other, of the mounting plates are fixedly connected; according to the stem cell detection liquid preparation device, a test tube is installed in an analyzer through the detection mechanism, so that preparation of the stem cell detection liquid can be completed, and compared with a traditional stem cell detection liquid preparation process, the stem cell detection liquid preparation device has the advantages that the detection efficiency is greatly improved; the test tube needs to be opened for multiple times to extract supernate or add a buffer solution and the like, the operation is simple, the detection and analysis efficiency of the stem cells is improved, stem cell suspension and the like cannot be exposed in an external environment, the damage of the stem cells is reduced, the supernate is conveniently and accurately extracted, and the influence on subsequent detection and analysis use is avoided.

A centrifugal separator arrangement includes: an energy converter positioned in proximity to a rotor of the centrifugal separator and configured to collect and convert the non-electrical energy generated by the rotor of the centrifugal separator into electrical energy; and a sensor configured to obtain a parameter associated with the operation of the centrifugal separator, wherein the sensor includes a processor configured to produce corresponding data, and wherein the sensor is in electrical connection with the energy converter to be powered by the electrical energy collected and converted by the energy converter. A method and a system for energy harvesting in the centrifugal separator arrangement is also provided.

The invention relates to the technical field of centrifugal machine control, in particular to a lower discharging centrifugal machine control method and system based on a PLC, and the method comprises the steps: obtaining a flow time sequence and a concentration time sequence of a material at a feeding valve in a feeding stage, and a power time sequence of a main motor of a centrifugal machine; obtaining a first characteristic value and a second characteristic value of the control moment by combining a correlation and an average trend of a flow time sequence and a concentration time sequence in a change trend in a time range corresponding to any control moment and a previous control moment, and a periodic fluctuation characteristic of a power time sequence; and a proportion parameter value is obtained by combining the first characteristic value and the second characteristic value, so that the rotating speed of a main motor of the lower discharging centrifugal machine is controlled at the corresponding control moment. The control effect on the main motor of the lower discharging centrifugal machine is improved, and therefore the filtering effect on materials is improved.

The invention relates to the technical field of hydrometallurgy production systems, in particular to a solvent regeneration control system for separating zirconium and hafnium through MIBK method centrifugal extraction, which comprises a control module used on a solvent regeneration neutralization reactor, and the control module comprises a heat exchange module; the heat exchange module comprises a heat exchange unit; the heat exchange unit comprises a cooling liquid flow adjusting unit, a cooling liquid temperature detecting unit and a cooling liquid pressure detecting unit. And the heat exchange module is used for controlling the flow of the cooling liquid, the pressure of the cooling liquid and the temperature of the cooling liquid of the heat exchange unit so as to adjust the temperature of the mixed phase in the neutralization reactor. The control system can monitor the flow, temperature and pressure of cooling liquid in real time, accurately control opening, closing and temperature adjustment of the heat exchange unit, quickly respond to temperature change of a mixed phase in the neutralization reactor, remove reaction heat in time, effectively avoid the problem of extraction system emulsification caused by high-temperature decomposition and polymerization of thiocyanic acid in the solvent regeneration process, and improve the extraction efficiency. The solvent regeneration efficiency and quality are ensured.

The cell treatment centrifugal cup comprises a cover body and a cup body, the cover body is used for sealing an upper opening of the cup body, the cup body comprises an upper cup body and a lower cup body which are integrally formed, a circular sleeve is arranged in the centrifugal cup, the upper end of the circular sleeve is fixedly connected with the lower portion of the cover body, and the lower end of the circular sleeve extends into the lower cup body and is suspended; a plurality of stirring paddles are mounted outside the circular sleeve; the upper cup body is of a cylindrical or big-end-up circular truncated cone structure, the inner wall face of the lower cup body gradually inclines towards the center from top to bottom, at least one protrusion is arranged on the inner wall face of the lower cup body, and the protrusions are arranged in the circumferential direction of the inner wall face of the lower cup body.

The invention provides a centrifugal machine rotor identification and control method and system, and relates to the field of centrifugal machines. The method comprises the steps that experimental data are input, sensing data are collected for comparison and verification, centrifugal parameters are generated, and the centrifugal parameters comprise the type, the volume, the mass and the concentration of a centrifugal tube and a solution; scanning a rotor ID and calling historical data, constructing a rotating speed-centrifugal parameter curve model, and determining a target rotating speed according to centrifugal parameters; real-time state data of a main shaft in the double-bearing structure of the rotor are monitored, implicit association between the real-time state data is analyzed, a constraint rule is generated, and the real-time state data comprise the physical state of the main shaft, the pawl-torsion spring mechanism state, the state of the double-bearing structure and the wind speed; and the real-time rotating speed of the rotor is obtained, and the real-time rotating speed of the rotor is adjusted in real time based on the constraint rule The technical problem that the centrifugal machine is low in precision, safety and efficiency due to the fact that the rotor rotating speed is preset depending on fixed single data is solved.

The invention discloses a centrifugal machine dynamic filtering efficiency improving method based on artificial intelligence optimization control, and relates to the technical field of centrifugal machine filtering efficiency optimization. Constructing an edge-cloud collaborative architecture system; the sensing layer deploys various sensors to acquire equipment operation data; the edge calculation layer processes the data and makes a decision; the network transmission layer ensures reliable transmission of data; the cloud platform is used for model training and global optimization; through preprocessing and feature extraction of collected data, the state is evaluated by using a hybrid model fusing deep learning and physical simulation, control parameters are optimized based on a multi-objective optimization function in combination with fuzzy logic and an adaptive algorithm, and dynamic feedback adjustment is realized by using electro-hydraulic servo and machine vision. According to the technology, intelligent operation of the centrifugal machine is achieved, compared with traditional control, the filtering efficiency is improved, energy consumption is reduced, the service life of filter cloth is prolonged, equipment fault diagnosis is more accurate, maintenance response is faster, production benefits are improved, and product market competitiveness is enhanced.

The invention relates to the technical field of centrifugal machines, in particular to an automatic discharging control method and system for a top-suspended scraper discharging centrifugal machine, and the method comprises the steps that vibration data and rotating speed data of a rotary drum of the centrifugal machine are obtained; dividing the whole data acquisition time into a plurality of time windows; according to the peak pulse characteristic, the periodic characteristic, the frequency change characteristic and the high-frequency characteristic of the vibration data of each time window, acquiring a comprehensive abnormal coefficient of each time window, and acquiring an abnormal influence coefficient of each time window in combination with the dispersion degree of the rotating speed data of each time window; and according to the change characteristics of the abnormal influence coefficient of the adjacent window of each time window, the unloading abnormal coefficient of each time window is obtained, and then the optimized prediction range parameter of each time window is obtained, so that the scraper movement control of the next time window is optimized. And the unloading efficiency of the centrifugal machine is improved by adaptively adjusting the prediction range parameter of each time window.

The invention discloses a centrifugal machine for sludge dewatering, belongs to the technical field of sludge dewatering, and aims to solve the problems that when the centrifugal machine for sludge dewatering is used, sludge on the inner wall of a rotary drum can be gradually compacted to form a filter cake layer, particles in the filter cake layer easily form a bridging structure at an inlet of a through hole, and the sludge dewatering efficiency is affected. A controller is arranged on the outer wall of the supporting frame, a cylinder is arranged in the supporting frame, one side of the cylinder communicates with a drainage pipe, a first driving assembly is arranged in the cylinder, a dewatering assembly is arranged on one side of the first driving assembly, a second driving assembly is arranged in the cylinder and rotationally connected with the cylinder, and a sewage pumping assembly is arranged at the top of the supporting frame. According to the invention, dual blockage clearing of crushing blockages by the conical rod and purging by high-pressure gas is conveniently realized, shutdown disassembly is not needed, continuous smoothness of the water outlet hole is guaranteed, stable efficiency of centrifugal dewatering is maintained, and the dewatering effect is enhanced.

The utility model relates to the technical field of turpentine recovery, and discloses a turpentine processing waste recycling device which comprises a recovery cylinder, the lower surface of the recovery cylinder is fixedly connected with a first motor, the output end of the first motor is fixedly connected with a centrifugal cylinder, and the lower end of the left side surface of the recovery cylinder is fixedly connected with a discharging pipe communicated with the interior of the recovery cylinder. Two filter plates are movably connected to the upper surface of the discharge pipe from left to right in a penetrating manner; racks are fixedly connected to the upper ends of the filter plates, and a driving mechanism is arranged at the position, between the two filter plates, of the upper surface of the discharging pipe; according to the turpentine recycling device, the scraping mechanism is arranged, and a spring in the scraping mechanism is stretched under the action of centrifugal force, so that a scraping plate is attached to the inner wall of the recycling barrel, and adhered turpentine is removed; impurities in rosin are filtered through filter plates, a second motor drives a gear to rotate, and staggered lifting of two racks can be realized, so that the two filter plates are quickly switched for use, and blockage caused by long-time use of the same filter plate is avoided.

The invention relates to the technical field of centrifugal machines, in particular to a variable-frequency energy-saving automatic control system of a centrifugal machine, which comprises a centrifugal module used for separating materials according to the centrifugal machine to obtain a target product and comprising a driving motor used for providing centrifugal power; the data processing module comprises a data acquisition unit used for acquiring operation data of the centrifugal machine; the frequency conversion self-control module comprises a main MCU (Microprogrammed Control Unit) for outputting an adjusting strategy of the centrifugal machine according to a neural network model; the counting adjusting module is used for determining the counting frequency of the timer in the slave MCU according to the start-stop response duration of the driving motor; the feed-forward adjusting module is used for determining the feed-forward lead of the auxiliary motor according to the phase deviation value of the PWM signal; and the cache adjustment module is used for determining an operation data cache trigger threshold according to the slave MCU instruction response deviation duration. The real-time performance of frequency conversion self-control of the centrifugal machine is improved.

The present invention relates to a centrifugal separator arrangement, the arrangement comprising: an energy converter positioned in proximity to a rotor of the centrifugal separator arrangement and configured to collect and convert the non-electrical energy collected from the centrifugal separator into electrical energy; a sensor configured to obtain a parameter associated with the operation of the centrifugal separator, wherein the sensor comprises a processor configured to produce corresponding data; wherein the sensor is in electrical connection with the energy converter to be powered by the electrical energy produced by the energy converter. The present invention also relates to a method and a system for energy harvesting in the centrifugal separator arrangement.

A portable centrifuge comprising a base, which includes a rotational mechanism contained within. A sequester wheel having a plurality of concentric rings, forming at least one channel and a central container. The at least one channel comprising a second volume and the central container comprising a first volume. A first cover is disposed over the sequester wheel to create a seal. A second cover is disposed over the first cover and is rotatable to engage with the rotational mechanism to initiate rotation at a predetermined RPM. The whole blood and / or other tissue is separated into its constituent components and deposited into the at least one channel and the central container. Specific volumes of the constituent components may be calculated to match or substantially match the first and second volumes for predetermined volume control and ease of access.

The utility model discloses a leukocyte-rich PRP (platelet rich plasma) extraction device. The centrifugal tube comprises a centrifugal tube body and a tube cap which are buckled with each other, the centrifugal tube body sequentially comprises a first cavity, a second cavity and a third cavity from top to bottom, the first cavity, the second cavity and the third cavity are communicated in sequence, and the tube inner diameter of the second cavity is smaller than that of the third cavity; the piston is embedded in the third cavity in a manner of moving up and down; the separation device is arranged in the third cavity in a penetrating manner; the separation device moves in the length direction of the second cavity so as to communicate or close the second cavity and the third cavity; according to the scheme, the leukocyte-rich platelet-rich plasma (LR-PRP) extraction device is efficient and easy and convenient to operate, high-concentration platelets and leukocytes can be effectively separated and extracted in single operation, the operation steps are simplified, the pollution risk is reduced, the extraction efficiency and the sample activity are improved, and therefore clinical requirements are better met.

The invention relates to the technical field of centrifugal machine intelligent control, in particular to an intelligent control system of a high-speed centrifugal machine, and the system comprises a sensing module which is used for collecting operation state parameters of the centrifugal machine in real time, carrying out the synchronous sampling of the operation state parameters, and generating multi-mode operation data; the dynamic modeling module is used for correcting parameters of the dynamic physical model in real time so as to generate a characteristic parameter set reflecting the overall dynamic state of the centrifugal machine; the control execution module is used for adjusting the rotating speed and the running time of the centrifugal machine driving motor in real time to realize closed-loop control; the automatic control module is used for adaptively correcting control strategy parameters according to a learning result so as to generate a dynamically updated centrifugal control curve and sending the centrifugal control curve to the control execution module so as to execute real-time control; and the sample characteristic data module is used for storing the sample characteristic data. And the operation stability, the control precision and the self-adaptive capacity of the centrifugal machine can be improved.

Systems and methods of clarifying a liquid suspension at high speeds contained in a flexible bag is provided. The method includes nesting at least one flexible bag containing the liquid suspension within at least one bag adapter with the at least one inlet line and / or outlet line extending from the flexible bag to an exterior of the bag adapter. The method further includes at least partially enclosing the at least one inlet line and / or outlet line within a crown cavity defined by a crown assembly. The method further includes centrifuging the at least one bag adapter and the at least one flexible bag containing the liquid suspension in a centrifuge to produce a super-natant fluid and a pellet in the at least one flexible bag.

The invention relates to a centrifuge for continuous flow centrifugation with drum (3), a rotor (4) and a motor (5), wherein the drum (3), driven by the motor (5), rotates around a common rotation axis (A) with a rotational frequency during use of the centrifuge (1), wherein the rotor (4) is coupled to the drum (3), wherein the centrifuge (1) comprises a drive bearing arrangement (7) with at least two drive ball bearings (8), wherein the drive ball bearings (8) each comprise an inner race (9), an outer race (10) and a bearing axis (8), wherein the drive ball bearings (8) rotate around the common rotation axis (A). It is proposed that the drive ball bearings (8) are angular drive ball bearings (8).

The utility model discloses a leukocyte-poor PRP (platelet rich protein) extraction device. The centrifugal tube comprises a centrifugal tube body and a tube plug which are buckled with each other, the centrifugal tube body sequentially comprises a first containing cavity, a second containing cavity and a third containing cavity from top to bottom, the first containing cavity, the second containing cavity and the third containing cavity are communicated in sequence, and the inner diameter of the second containing cavity is smaller than that of the third containing cavity; the piston is embedded in the third accommodating cavity in a manner of moving up and down; the device further comprises a separation assembly arranged in the third containing cavity in a penetrating mode, and the separation assembly moves in the length direction of the second containing cavity so as to communicate or close the second containing cavity and the third containing cavity. The pipe plug extends towards the first containing cavity and is provided with a protrusion. The scheme provides a leukocyte-poor platelet plasma (P-LR PRP) extraction device which is efficient and simple and convenient to operate. According to the device, high-concentration platelets can be effectively separated and extracted in simple operation, meanwhile, the content of white blood cells is remarkably reduced, the operation steps are simplified, and the pollution risk is reduced.

The invention discloses a centrifugal machine rotating speed control method and system based on image recognition. The method comprises the following steps: acquiring each frame of preprocessed rotor region image; feature point extraction is carried out on each continuous two frames of images of each frame of preprocessed rotor region image, so that a rotation angle, an angular velocity estimation value and a rotor motion track are obtained; obtaining a fused rotation angle and an angular velocity estimation value according to the preprocessed rotor region image; according to the fused rotation angle and angular velocity estimation value, the rotation angle and angular velocity estimation value after self-adaptive fusion is obtained; calculating a real-time rotating speed estimation value of the centrifugal machine; generating a corrected real-time rotating speed estimated value according to the real-time rotating speed estimated value; and acquiring a control signal according to the corrected real-time rotating speed estimation value. According to the technical scheme, the anti-interference performance, the control precision and the environmental adaptability of the system can be remarkably improved, and the high-precision and high-stability control requirements of the high-speed centrifugal machine are met.

A processing device includes a pump system, a valve system, a centrifuge, and a controller. A fluid flow circuit is mounted to the device to execute a procedure in which whole blood is processed into a red blood cell product, a plasma product, and a platelet concentrate product. The blood is first separated into red blood cells, buffy coat, and plasma using the centrifuge, with the red blood cells and plasma being removed from the centrifuge, while the buffy coat remains in the centrifuge. The fluid remaining in the centrifuge is circulated through the centrifuge to form a homogenous mixture. Once the mixture is formed, it is separated in the centrifuge into platelet concentrate and red blood cells. A platelet product is then collected by using whole blood or previously collected red blood cells to push the platelet concentrate from the centrifuge to a collection container.

The application provides a centrifuge fault early warning method, device and equipment, and relates to the centrifuge field, which solves the problem that the centrifuge must be stopped during the working process. The centrifuge fault early warning method is characterized in that: the rotor system of the centrifuge is discretized, at least one component of the discretized rotor system is obtained, the rotor system motion equation is determined according to the at least one component, the rotor system motion equation is corrected, the centrifuge fault prediction model is determined through the corrected rotor system motion equation, the real-time parameters of the at least one component of the discretized rotor system of the centrifuge are input into the centrifuge fault prediction model for prediction, the fault prediction result including the offset degree of the at least one component of the discretized rotor system is obtained, and the functions of online monitoring, trend analysis and fault early warning of the centrifuge are realized, so that the preventive maintenance of the centrifuge is achieved.

The utility model discloses multistage separation and purification equipment for fish oil, which is applied to the technical field of fish oil processing and comprises a box body, a centrifugal cavity is arranged at the top of the box body, one side of the centrifugal cavity is rotatably connected with a connecting rod through a bearing, and a driving motor in bolted connection with the connecting rod is mounted on one side of the centrifugal cavity through a fixing piece. A fixed seat is bolted in the centrifugal cavity; the fixing seat is mounted in the centrifugal cavity, the centrifugal cylinder is mounted at the bottom of the fixing seat, when the driving motor drives the connecting rod to rotate, the centrifugal cylinder rotates under the action of the bevel gear and the bevel fluted disc, the purpose of centrifugal separation of fish oil containing impurities is achieved, and the cleaning brush mounted on the support is matched, so that the cleaning efficiency is improved. The centrifugal barrel can be continuously cleaned when the centrifugal barrel rotates, so that impurities are prevented from blocking holes of the centrifugal barrel when the centrifugal barrel performs centrifugal separation and purification on fish oil, and normal operation of centrifugal separation and purification work is guaranteed.

The utility model discloses a device for preparing platelet-rich plasma suspension and gel containing blood cells. Comprising a fixing frame, at least one rapid clamping pipe clamp installed on the fixing frame, a vacuum centrifugal pipe clamped in the rapid clamping pipe clamp, and two suction devices capable of being inserted into the centrifugal pipe from the top or the bottom of the centrifugal pipe. The pusher is used for pushing the aspirator to be inserted into the centrifugal tube; the rotating mechanism is used for driving the pusher to rotate so as to enable the aspirator to face the top or the bottom of the centrifugal tube; the utility model solves the problems of blood pollution, manual operation error and low extraction rate in the manual operation process in the prior art, retains all blood platelets and white blood cells in the blood, retains red blood cells in normal proportion and most plasma proteins, and improves the extraction efficiency. Moreover, the concentration of platelets and leukocytes is constantly about 4 times of the concentration of blood of common normal people, the functions of erythrocyte components are reserved, and the functional effects of various components in the blood can be better exerted.

The centrifugal cup for cell treatment comprises a centrifugal cup body, a centrifugal cup head and a first flow guide pipe, the top of the centrifugal cup body is rotatably connected with the centrifugal cup head in a sealed mode along the longitudinal axis of the centrifugal cup, and a centrifugal treatment bin is arranged in the centrifugal cup body; an inlet, a first outlet and a second outlet are formed in the top of the centrifugal cup head, the bottom of the centrifugal cup head penetrates through the top of the centrifugal cup body and extends into the centrifugal cup body, and the top of the centrifugal cup body is rotatably connected with the middle of the centrifugal cup head in a sealed mode along the longitudinal axis of the centrifugal cup; the first flow guide pipe is arranged in the centrifugal cup body, the first end of the first flow guide pipe is fixedly connected with the inner side of the top of the centrifugal cup body, and the second end of the first flow guide pipe is arranged at the bottom of the centrifugal treatment bin and communicates with the outer edge of the centrifugal treatment bin; the inlet is communicated with the centrifugal treatment bin; the first outlet is communicated with the inner side of the centrifugal treatment bin through an interlayer flow channel in the side wall of the centrifugal cup body, and the interlayer flow channel is located above the outer edge; the second outlet is communicated with the outer edge through a first flow guide pipe.

A rotor assembly (10, 150, 270, 310) and method of using the rotor assembly (10, 150, 270, 310). The rotor assembly (10, 150, 270, 310) includes a bio-process bag (48), a drum (46) that receives a lower portion of the bag (48), and a pressure ring (50). A holder (54, 182) couples an upper portion of the bag (48) to the pressure ring (50). The pressure ring (50) is coupled to the drum (46) to define an interior space that contains the bag (48). A liquid transport assembly (35, 178, 272) passes through an opening in the holder (54, 182) so that liquids can be added to, and removed from, the bag (48) without removing the rotor (16, 154) from the centrifuge. A bearing assembly (190) in the holder (54, 182) couples the liquid transport assembly (35, 178, 272) to the rotor (16, 154), and enables the liquid transport assembly (35, 178, 272) to remain stationary while the rotor (16, 154) rotates around it. One or more seal assemblies (276, 312) provide a fluid-tight seal against the outer portion of the liquid transport assembly (35, 178, 272), and prevent fluids from leaking from the bag (48) during centrifugation.