CN115824497A - CT dynamic balance correction device, equipment and correction method - Google Patents
CT dynamic balance correction device, equipment and correction method Download PDFInfo
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- CN115824497A CN115824497A CN202211588905.6A CN202211588905A CN115824497A CN 115824497 A CN115824497 A CN 115824497A CN 202211588905 A CN202211588905 A CN 202211588905A CN 115824497 A CN115824497 A CN 115824497A
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Abstract
The application discloses CT dynamic balance correcting unit, equipment and correction method, this CT dynamic balance correcting unit includes: the frame body is used for being fixed on a rotor of the CT scanning equipment; the first counterweight is arranged on the frame body, can linearly move and be positioned on the frame body along a first direction, and the first direction is the radial direction of the rotor; the second counterweight is arranged on the frame body, can move and be positioned on the frame body along a second direction, and the second direction is parallel to the axis of the rotor and perpendicular to the direction of the rotation plane of the rotor. This application has realized reducing CT scanning equipment's dynamic balance and has rectified the degree of difficulty, reduces the technological effect to the reliance of quality weight and other adjusting device on the place, and then has solved among the correlation technique CT dynamic balance and has rectified all to have higher requirement to the quality design of minimum counter weight and place adjustment scheme, to the higher problem of other adjusting device dependencies.
Description
Technical Field
The application relates to the technical field of CT scanning, in particular to a CT dynamic balance correction device, equipment and a correction method.
Background
The static equilibrium state is a state in which the rotation axis of the rotating body passes through the center of mass. The dynamic balance state is a state in which the rotation axis of the rotating body coincides with the center principal axis of inertia of the rotating body. The dynamic balance is a special state of static balance, and if the rotating body reaches the static balance state, the even unbalance can be eliminated through further adjustment so as to reach the dynamic balance state.
CT scanning frame major structure: a rotating part (rotor), bearings and a stationary part. The rotating part is connected with various large parts through a rotating plate, and the mass of each rotating part component, the uncertainty of the mass center and the assembly error require that the dynamic balance is corrected aiming at different individual systems.
The traditional system dynamic balance correction scheme is that a dynamic balance tester independent of the system is used for detecting the dynamic balance state of equipment, calculating and analyzing the dynamic balance state, outputting counterweight indication, and performing counterweight adjustment according to the counterweight indication; the balance weight adjustment is realized by respectively arranging configuration points on at least two different planes parallel to the rotating system and not less than two angular phases and properly increasing or decreasing weights on the corresponding configuration points. However, the conventional correction scheme has limitations of detection and analysis of the balance state and adjustment of the balance weight.
Limitations of detection and analysis of equilibrium states: dependence on expensive equipment (dynamic balance tester), resulting in high costs of production and service; the operation of the equipment is complicated, and due to layout limitation, the operability of the counterweight indication of the equipment is not strong due to the irregularity of the design of the counterweight point rotation radius, the rotation plane, the angle quadrant and the like.
Limitation of counterweight adjustment: the field counterweight needs additional mass weights, so that the types of material spare parts are increased, and the dependence of counterweight adjustment on the spare parts is strong; the weight of the weight can not just meet the counterweight requirement of a specific counterweight point, so that the weight design and the field adjustment scheme of the minimum counterweight weight have higher requirements.
Disclosure of Invention
The main purpose of this application is to provide a CT dynamic balance correcting unit to solve CT dynamic balance among the prior art and rectify and all have higher requirement to the quality design of minimum counter weight and place adjustment scheme, to the higher problem of other adjustment device dependencies.
In order to achieve the above object, the present application provides a CT dynamic balance correction apparatus, including:
the frame body is used for being fixed on a rotor of the CT scanning equipment;
the first counterweight is arranged on the frame body, can linearly move and be positioned on the frame body along a first direction, and the first direction is the radial direction of the rotor;
the second counterweight is arranged on the frame body, can move and be positioned on the frame body along a second direction, and the second direction is parallel to the axis of the rotor and perpendicular to the direction of the rotation plane of the rotor.
Furthermore, two first guide rails are arranged on the frame body, the first guide rails extend along a first direction, the two first guide rails are distributed at two ends of the frame body, and two ends of each first guide rail are connected with the frame body;
the two first balance weight parts are respectively sleeved on the two first guide rails in a sliding manner and can be positioned; the two first balance weight parts are connected through a first connecting rod;
the first connecting rod is provided with a second guide rail, the second guide rail extends along a second direction, and the second counterweight is movably arranged on the second guide rail and can be positioned.
Further, the device also comprises a driving mechanism, and the driving mechanism is used for driving the first connecting rod to linearly reciprocate along the first direction.
Furthermore, a first adjusting screw rod is arranged on the frame body, the first adjusting screw rod extends along a first direction and is positioned between the two first guide rails, two ends of the first adjusting screw rod are rotatably connected with the frame body, and the first connecting rod is in threaded connection with the first adjusting screw rod;
the driving mechanism is in transmission connection with the first adjusting screw rod.
Furthermore, a second guide rail is provided as a second adjusting screw rod, the two second adjusting screw rods are arranged and distributed on two sides of the first connecting rod, and the second adjusting screw rods extend along a second direction;
the second counterweight part is in threaded connection with the second adjusting screw rod.
Furthermore, the frame body comprises a bottom plate and a top plate, the two ends of the first guide rail are fixedly connected with the bottom plate and the top plate respectively, and the two ends of the first adjusting screw rod are rotatably connected with the bottom plate and the top plate respectively.
According to another aspect of the present application, there is provided a CT scanning apparatus, comprising at least two of the CT dynamic balance correction devices described above;
at least two CT dynamic balance correction devices are fixedly arranged on a rotor of the CT scanning equipment, and phase angles on a rotating plane of the rotor are not coincident.
According to another aspect of the present application, there is provided a dynamic balance correction method of a CT scanning apparatus, which is applied to the CT scanning apparatus described above, and includes the following steps:
monitoring the waveform of vibration VR in a first direction and the waveform of vibration VZ in a second direction during the rotation of the rotor by using a vibration sensor;
forming balance feature data V from VR based on rotation angle information theta of rotary encoder in synchronization with rotation of rotor R (theta), forming equilibrium characteristics data V from VZ Z (θ)；
Based on equilibrium characteristic data V R (theta) and V Z (θ) performing a balance adjustment analysis and determining an adjustment mode of the first and second weight members.
Further, in the balance characteristic data V R In the step (theta), the peak point phase theta represents the phase relation between the current unbalance phase and the vibration sensor, and the amplitude represents the magnitude of the unbalance;
at equilibrium characteristic data V Z In the step (theta), the peak point phase theta represents the phase relation between the current unbalance phase and the vibration sensor, and the amplitude represents the magnitude of the unbalance.
According to another aspect of the present application, there is provided a dynamic balance correction system of a CT scanning apparatus, the dynamic balance correction method using the above-mentioned method includes:
a vibration sensor for monitoring a waveform of vibration VR in a first direction and a waveform of vibration VZ in a second direction during rotation of the rotor;
a phase vibration processing module for forming balance characteristic data V according to VR based on rotation angle information theta of the rotary encoder synchronous with the rotation of the rotor R (θ), forming balance features according to VZSign data V Z (θ)；
A balance analysis module based on balance characteristic data V R (theta) and V Z (theta) performing balance adjustment analysis and determining adjustment modes of the first counterweight member and the second counterweight member;
the balance analysis module includes:
a vibration analysis unit for analyzing the balance characteristic data V R (theta) and balance characteristic data V Z (theta) analyzing to obtain a vibration characteristic state related to the balance state, and quantitatively judging whether the related vibration characteristic state reaches balance or not;
the state management unit is used for recording two current and historical states: a mass distribution state and an equilibrium state corresponding to the mass distribution state;
the balance adjusting unit outputs an adjusting scheme and executes adjusting control operation when the vibration analyzing unit judges that the balance is not reached; the determination of the adjustment scheme is given by performing feature learning based on all the mass distribution states recorded in the state management unit and the balance state corresponding to the mass distribution state;
after the adjustment scheme is executed, the state management unit updates the current quality distribution state and the balance state corresponding to the quality distribution state.
In the embodiment of the application, the frame body is used for being fixed on a rotor of the CT scanning equipment; the first counterweight is arranged on the frame body, can linearly move and be positioned on the frame body along a first direction, and the first direction is the radial direction of the rotor; the second counterweight member is arranged on the frame body and can move and be positioned on the frame body along a second direction, the second direction is parallel to the axis of the rotor and is perpendicular to the direction of the rotating plane of the rotor, the position of the first counterweight member on the frame body is adjusted to change the position relation of the mass center and the rotating shaft of the rotor under the phase, the distribution of the rotational inertia on the phase is adjusted by the first counterweight member, the included angle between the central inertia main shaft and the rotating shaft of the rotor under the phase is changed by adjusting the position of the second counterweight member on the frame body, and the couple unbalance under the phase is eliminated by the second configuration member, so that the dynamic balance correction difficulty of the CT scanning equipment is reduced, the technical effect of dependence on the mass weight and other adjusting equipment on the field is reduced, the problem that the CT dynamic balance correction in the related technology has higher requirements on the mass design of the minimum counterweight weight and the field adjusting scheme and has higher dependence on other adjusting equipment is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
FIG. 1 is a schematic structural diagram according to an embodiment of the present application;
FIG. 2 isbase:Sub>A schematic cross-sectional view A-A of an embodiment according to the present application;
FIG. 3 is a schematic diagram of an application of a calibration device according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a dynamic balance correction system according to an embodiment of the present application;
the device comprises a frame body 1, a top plate 101, a bottom plate 102, a first adjusting screw rod 2, a first guide rail 3, a first counterweight 4, a first connecting rod 5, a second counterweight 6, a second guide rail 7, a dynamic balance correction device 8CT, a first direction 9 and a second direction 10.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used.
In the present application, the terms "upper", "lower", "inner", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as the case may be.
Furthermore, the terms "disposed," "provided," "connected," "secured," and the like are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The traditional system dynamic balance correction scheme is that a dynamic balance tester independent of the system is used for detecting the dynamic balance state of equipment, calculating and analyzing the dynamic balance state, outputting counterweight indication, and performing counterweight adjustment according to the counterweight indication; the balance weight adjustment is realized by respectively arranging configuration points on at least two different planes parallel to the rotating system and not less than two angular phases and properly increasing and decreasing weights on the corresponding configuration points. However, the conventional correction scheme has limitations in detection and analysis of the equilibrium state and in adjustment of the balance weight. For the balance weight adjustment, the field balance weight needs additional mass weights, the types of material spare parts are increased, and the dependence of the balance weight adjustment on the spare parts is strong; the weight of the weight can not just meet the counterweight requirement of a specific counterweight point, so that the weight design and the field adjustment scheme of the minimum counterweight weight have higher requirements.
Therefore, to solve the above problem, as shown in fig. 1 to 3, an embodiment of the present application provides a CT dynamic balance correction device 8, where the CT dynamic balance correction device 8 includes:
the frame body 1 is used for being fixed on a rotor of CT scanning equipment;
the first counterweight 4 is arranged on the frame body 1, can linearly move and be positioned on the frame body 1 along a first direction 9, and the first direction 9 is the radial direction of the rotor;
the second weight 6 is disposed on the frame body 1 and can be moved and positioned on the frame body 1 along a second direction 10, and the second direction 10 is a direction (parallel to the Z axis) parallel to the axis of the rotor and perpendicular to the rotation plane of the rotor.
In this embodiment, the CT dynamic balance correction device 8 mainly comprises three parts, namely a frame body 1, a first counterweight 4 and a second counterweight 6, and the frame body 1 serving as a mounting base of the first counterweight 4 and the second counterweight 6 can be fixed on a rotor of the CT scanning device and can synchronously rotate along with the rotor. The frame body 1, the first counterweight 4 and the third counterweight jointly form a mass load device arranged on the rotor. Since the dynamic balance of the rotor needs to be adjusted in two dimensions, one of which is the radial direction of the rotor, i.e. to the position of the mass loading device in the radial direction of the rotor, different radial positions will affect the size of the rotational inertia of the rotor (I = mR ^ 2), i.e. the distribution of the rotational inertia. The other dimension is a direction parallel to the axis of the rotor, and different positions can influence the included angle between the central inertia main shaft and the rotating shaft of the rotor in the rotating process, namely the couple unbalance.
Therefore, in order to adjust the CT dynamic balance correction device 8 in two dimensions, the CT dynamic balance correction device includes the first weight 4 and the second weight 6, and the positions of the first weight 4 and the second weight 6 on the frame body 1 are adjustable, and the two weights are different in the adjustable direction. The linear moving direction of the first balance weight 4 on the frame body 1 is a first direction 9, the first direction 9 is the radial direction of the rotor, the linear moving direction of the second balance weight 6 on the frame body 1 is a second direction 10, and the second direction 10 is a direction perpendicular to the rotation plane of the rotor and parallel to the axis of the rotor.
Specifically, the center of mass/mass of the rotor is adjusted in the radial direction as follows: the relation between the mass center of the rotor and the rotating shaft of the rotor in the phase (namely the phase of the first counterweight 4 on the rotating plane of the rotor) is changed, the rotational inertia of the rotor in the phase (I = mR ^ 2) is changed by adjusting the position (changing the rotating radius R) of the first counterweight 4 in the radial direction (the first direction 9) of the rotor, the rotational inertia distribution of the mass on the phase is further adjusted, and finally the aim is to enable the mass center of the rotor to be located on the axis of the rotor by adjusting the position of the first counterweight 4 in the radial direction of the rotor.
The center of mass plane of the rotor is adjusted as follows: the adjustment of the center of mass in the axial direction (second direction 10) of the rotor can change the included angle between the central inertia main shaft of the rotor and the axial line of the rotor in the phase, and further the couple unbalance amount in the phase can be eliminated through the adjustment of the center of mass plane. Specifically, the position of the second counterweight 6 in the second direction 10 is adjusted to change the angle between the central inertia main shaft and the axis of the rotor at the phase, and finally the purpose to be achieved is to make the central inertia main shaft coincide with the axis of the rotor by adjusting the position of the second counterweight 6 in the axial direction of the rotor.
When the first balance weight 4 and the second balance weight 6 are adjusted in place, the first balance weight 4 and the second balance weight 6 need to be fixed so as to prevent the rotor from being incapable of keeping dynamic balance due to displacement caused by centrifugal force in the rotation process of the rotor. Therefore, the first counterweight member and the second counterweight member 6 cannot be simply connected with the frame body 1 in a sliding manner, and the first counterweight member 4 and the second counterweight member 6 need to be positioned by a self-locking structure or by a locking mechanism. When a self-locking structure is selected, the frame body 1 can be provided with screw rods corresponding to the first weight part 4 and the second weight part 6, the first weight part 4 and the second weight part 6 are in threaded connection with the corresponding screw rods, and self-locking is achieved through threads. When an additional locking structure is employed, positioning pins for matching the first and second weights 4 and 6 may be disposed on the frame body 1.
In the present embodiment, the distribution of the adjusting mass in the radial direction of the rotor is achieved by adjusting the position of the first counterweight 4 in the first direction 9 of the rotor, thereby adjusting the distribution of the moment of inertia of the mass in this phase, and the distribution of the adjusting mass in the axial direction of the rotor is achieved by adjusting the position of the second counterweight 6 in the second direction 10 of the rotor, thereby eliminating the couple imbalance of the rotor in this phase. The rotor is further brought into a dynamic balance state by adjusting the positions of the first and second balance weights 4 and 6. For the rotor dynamic balance adjustment realized by replacing weights with different weights in the prior art, the correcting device in the embodiment does not need to replace a plurality of weights, and only needs to adjust the positions of the weights. Therefore, the types of material spare parts are reduced, the dependency of counterweight adjustment on the spare parts is reduced, the mass of a minimum counterweight is not required to be designed, and the difficulty of counterweight adjustment is reduced.
The adjustment process of the CT dynamic balance correction device 8 is realized by the linear movement of the first weight 4 and the second weight 6, and the moving directions of the first weight 4 and the second weight 6 are perpendicular to each other, so that the whole correction device can be reduced in size as much as possible while the two can move in the first direction 9 and the second direction 10 on one frame body 1 respectively, and certain moving space requirements can be met.
In this embodiment, the frame body 1 is provided with two first guide rails 3, the first guide rails 3 extend along a first direction 9, the two first guide rails 3 are distributed at two ends of the frame body 1, and two ends of each first guide rail 3 are connected with the frame body 1;
the two first balance weight parts 4 are respectively sleeved on the two first guide rails 3 in a sliding manner and can be positioned; the two first balance weights 4 are connected through a first connecting rod 5;
the first connecting rod 5 is provided with a second guide rail 7, the second guide rail 7 extends along a second direction 10, and the second counterweight 6 is movably arranged on the second guide rail 7 and can be positioned.
In the present embodiment, the first guide rail 3 and the second guide rail 7 have various structures, and the specific structure needs to be taken into consideration of the connection mode with the first weight member 4 and the second weight member 6. For example, the first weight 4 is slidably sleeved on the first guide rail 3, the second weight 6 is slidably sleeved on the second guide rail 7, the first guide rail 3 and the second guide rail 7 are both arranged in a cylindrical or square shape, the first weight 4 is provided with a cylindrical through hole or a square through hole matched with the first guide rail 3 in shape, and the second weight 6 is similar to the first weight. Of course, the first weight member 4 is slidably connected to the first guide rail 3, the second weight member 6 is slidably connected to the second guide rail 7, the first guide rail 3 may be provided with a T-shaped chute, the first weight member 4 is provided with a slide block matched with the chute, and the second guide rail 7 and the second weight member 6 are similar.
In consideration of occupancy rate in space and stability of operation of the apparatus, it is preferable in the present embodiment that the first weight 4 is slidably fitted over the first rail 3, the second weight 6 is slidably fitted over the second rail 7, and the first rail 3 and the second rail 7 are provided in a cylindrical configuration.
In this embodiment, since the first connecting rod 5 is connected with the second guide rail 7, the second weight 6 will move linearly along the first direction 9 synchronously with the first weight 4, while the first weight 4 will not move linearly with the second weight 6. In other words, the entire frame body 1 has a sufficient space for the movement of the first weight member 4 and a sufficient space for the movement of the second weight member 6. And other structures are adopted, so that the moving space of the two balance weights in the respective directions is inevitably reduced, or the volume of the whole device is inevitably increased.
The positions of the first counterweight 4 and the second counterweight 6 can be manually adjusted or automatically adjusted, and when the positions are automatically adjusted, a driving structure capable of realizing linear motion, such as a linear motor, a linear screw rod transmission mechanism, a crank slide block, an air cylinder and the like, is required to be configured for the first counterweight 4 and the second counterweight 6. Since the second weight 6 moves in accordance with the first weight 4, when the second weight 6 is also provided with an automatic adjusting device, it is necessary to consider that the device moves in accordance with the movement of the first weight 4.
For the sake of simplicity, only one driving mechanism is provided in this embodiment to drive the first weight 4 to be automatically adjusted, while the second weight 6 can be manually adjusted. Therefore, the correcting device in this embodiment further includes a driving mechanism for driving the first link 5 to linearly reciprocate in the first direction 9. The specific structure of the driving mechanism is not limited in this embodiment, and any motion mechanism capable of outputting linear motion may be adopted.
In order to improve the correction efficiency, the number of the first balance weights 4 is two, the corresponding first guide rails 3 are two and are distributed on two sides of the frame body 1, and the number of the first balance weights 4 is two and are respectively sleeved on the two first guide rails 3; in order to enable the two first balance weights 4 to move synchronously, the two first balance weights 4 are connected with each other through a first connecting rod 5. The frame body 1 comprises a bottom plate 102 and a top plate 101, two ends of a first guide rail 3 are fixedly connected with the bottom plate 102 and the top plate 101 respectively, and two ends of a first adjusting screw rod 2 are rotatably connected with the bottom plate 102 and the top plate 101 respectively.
The following description is made of the linear movement driving structure of the first weight 4 in the present embodiment:
the frame body 1 is provided with a first adjusting screw rod 2, the first adjusting screw rod 2 extends along a first direction 9, two ends of the first adjusting screw rod 2 are rotatably connected with the frame body 1, the first adjusting screw rod 2 is positioned in the middle of the frame body 1, two ends are rotatably connected with a corresponding top plate 101 and a corresponding bottom plate 102 through bearings, and a first connecting rod 5 is in threaded connection with the first adjusting screw rod 2; the first driving mechanism is in transmission connection with the first adjusting screw rod 2, the first adjusting screw rod 2 is driven to rotate through the first driving mechanism, so that the first counterweight 4 is driven to linearly move on the first guide rail 3, and the first guide rail 3 can limit the rotation of the first counterweight 4 while playing a guiding role.
The second guide rail 7 is provided with two second adjusting screw rods which are distributed on two sides of the first connecting rod 5 and extend along a second direction 10; the second counterweight 6 is in threaded connection with the second adjusting screw rod. The position of the second weight member 6 in the second direction 10 can be adjusted by manually rotating it.
According to another aspect of the present application, there is provided a CT scanning apparatus, comprising at least two CT dynamic balance correction devices 8; to meet the adjustment requirement, as shown in fig. 3, at least two CT dynamic balance correction devices 8 are fixed on the rotor of the CT scanning apparatus, and the phase angles on the rotation plane of the rotor are not coincident.
According to another aspect of the present application, there is provided a dynamic balance correction method of a CT scanning apparatus, which is applied to the CT scanning apparatus described above, and includes the following steps:
monitoring the waveform of the vibration VR in a first direction and the waveform of the vibration VZ in a second direction during the rotation of the rotor by using a vibration sensor;
in order to ensure that the periodic vibration waveform related to the phase of the rotation angle can be detected, a multi-axis vibration probe is arranged on the stator or a static part which is close to the stator and is stably and rigidly connected with the stator to monitor the vibration signal of the rotor;
forming balance feature data V from VR based on rotation angle information theta of rotary encoder in synchronization with rotation of rotor R (theta), forming equilibrium characteristics data V from VZ Z (θ)；
To convert the input vibration signal into analyzable data, the phase angle may be correlated with the vibration waveform function based on a clock synchronization manner to generate balance characteristic data V R (theta) and V Z (θ)；
At equilibrium characteristic data V R In the step (theta), the peak point phase theta represents the phase relation between the current unbalance phase and the vibration sensor, and the amplitude represents the magnitude of the unbalance;
at equilibrium characteristic data V Z In the step (theta), the peak point phase theta represents the phase relation between the current unbalance phase and the vibration sensor, and the amplitude represents the magnitude of the unbalance;
based on equilibrium characteristic data V R (theta) and V Z (theta) analysis of balance adjustment and confirmationAnd determining the adjustment mode of the first counterweight member and the second counterweight member.
In this embodiment, V R The vibration signal of (theta) is the detection and analysis basis of the static unbalance, the principle basis is that the mass center is far away from the rotating shaft to bring radial vibration, and the radial vibration extreme value phase of the curve is the superposition phase of the installation phase of the vibration sensor and the static unbalance, so that the static unbalance state can be detected, and an adjustment scheme can be provided by analysis. The vibration signal of VZ (theta) is the detection and analysis basis of even unbalance, as shown in the following chart, the extreme phase of Z-direction vibration of a Z vibration curve brought by a couple of force is the superposition phase of the installation phase of the detector and the even unbalance, and therefore the even unbalance state can be detected and an adjustment scheme can be recommended.
In the balance adjustment analysis, balance characteristic data V is included R (theta) and equilibrium feature data V Z And (theta) analyzing to obtain the vibration characteristic states (such as amplitude, frequency, phase and the like) related to the balance state, and quantifying the related vibration characteristic states to judge whether the balance is achieved. And when the balance is judged not to be reached, an adjustment scheme needs to be determined. And the adjustment scheme is determined through the current mass distribution state and the balance state corresponding to the mass distribution state, and the historical mass distribution state and the balance state corresponding to the mass distribution state.
The determination of the adjustment scheme is given by feature learning based on all recorded mass distribution states and the equilibrium state corresponding to the mass distribution state. After the adjustment scheme is executed, the state management unit updates the current quality distribution state and the balance state corresponding to the quality distribution state.
According to another aspect of the present application, as shown in fig. 4, there is provided a dynamic balance correction system of a CT scanning apparatus, the dynamic balance correction method using the above-mentioned method includes:
a vibration sensor for monitoring a waveform of vibration VR in a first direction and a waveform of vibration VZ in a second direction during rotation of the rotor;
a phase vibration processing module for processing the phase vibration based on the rotation angle information theta of the rotary encoder in synchronization with the rotation of the rotor,forming equilibrium characteristics data V from VR R (theta), forming equilibrium characteristics data V from VZ Z (θ)；
In order to convert the input vibration signal into analyzable data, the phase vibration processing module should associate the phase angle with the vibration waveform function based on the clock synchronization mode to generate the balance characteristic data V R (theta) and V Z (θ)；
A balance analysis module based on balance characteristic data V R (theta) and V Z (theta) performing balance adjustment analysis and determining adjustment modes of the first counterweight member and the second counterweight member;
the balance analysis module is generally decomposed into three secondary units according to functions, wherein the three secondary units are respectively as follows:
a vibration analysis unit for analyzing the balance characteristic data V R (theta) and equilibrium feature data V Z (theta) analyzing to obtain vibration characteristic states (such as amplitude, frequency, phase and the like) related to the balance state, and quantifying and judging whether the related vibration characteristic states reach balance;
the state management unit is used for recording two current and historical states: a mass distribution state and an equilibrium state corresponding to the mass distribution state, and the two states can be called and updated from a database;
the balance adjusting unit outputs an adjusting scheme and executes adjusting control operation when the vibration analyzing unit judges that the balance is not reached; the determination of the adjustment scheme is given by performing feature learning based on all the mass distribution states recorded in the state management unit and the balance state corresponding to the mass distribution state;
after the adjustment scheme is executed, the state management unit updates the current quality distribution state and the balance state corresponding to the quality distribution state.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A CT dynamic balance correction apparatus, comprising:
the frame body is used for being fixed on a rotor of the CT scanning equipment;
the first counterweight is arranged on the frame body, can linearly move and be positioned on the frame body along a first direction, and the first direction is the radial direction of the rotor;
the second counterweight is arranged on the frame body, can move and be positioned on the frame body along a second direction, and the second direction is parallel to the axis of the rotor and perpendicular to the direction of the rotation plane of the rotor.
2. The CT dynamic balance correction device according to claim 1, wherein the frame body is provided with two first guide rails, the first guide rails extend along a first direction, the two first guide rails are distributed at two ends of the frame body, and two ends of each first guide rail are connected with the frame body;
the two first balance weight parts are respectively sleeved on the two first guide rails in a sliding manner and can be positioned; the two first balance weight parts are connected through a first connecting rod;
the first connecting rod is provided with a second guide rail, the second guide rail extends along a second direction, and the second counterweight is movably arranged on the second guide rail and can be positioned.
3. The CT dynamic balance correction device according to claim 1, further comprising a driving mechanism for driving the first link to linearly reciprocate in a first direction.
4. The CT dynamic balance correction device of claim 2, wherein a first adjusting screw rod is disposed on the frame body, the first adjusting screw rod extends along a first direction and is located between the two first guide rails, two ends of the first adjusting screw rod are rotatably connected with the frame body, and the first connecting rod is in threaded connection with the first adjusting screw rod;
the driving mechanism is in transmission connection with the first adjusting screw rod.
5. The CT dynamic balance correction apparatus according to claim 2, wherein the second guide rail is provided as a second adjusting screw, the second adjusting screw is provided in two and distributed at both sides of the first connecting rod, the second adjusting screw extends in a second direction;
the second balance weight part is in threaded connection with the second adjusting screw rod.
6. The CT dynamic balance correction device according to claim 2, wherein the frame body comprises a bottom plate and a top plate, two ends of the first guide rail are respectively and fixedly connected with the bottom plate and the top plate, and two ends of the first adjusting screw rod are respectively and rotatably connected with the bottom plate and the top plate.
7. A CT scanning device, characterized by comprising at least two CT dynamic balance correction devices as claimed in any one of claims 1 to 6;
at least two CT dynamic balance correction devices are fixedly arranged on a rotor of the CT scanning equipment, and phase angles on a rotating plane of the rotor are not coincident.
8. A dynamic balance correction method of a CT scanning apparatus, which is applied to the CT scanning apparatus according to claim 7, and comprising the steps of:
monitoring vibration V in a first direction during rotation of a rotor using a vibration sensor R And the waveform of the vibration VZ in the second direction;
forming balance characteristic data V from VR based on rotation angle information theta of rotary encoder in synchronization with rotation of rotor R (θ) forming equilibrium signature data V from VZ Z (θ)；
Based on equilibrium characteristic data V R (theta) and V Z (theta) performing a balance adjustment analysis and determining a first counterweight member and a second counterweightThe way of adjustment of the piece.
9. The dynamic balance correction method of CT scanner according to claim 8, wherein the balance characteristic data V R In the step (theta), the peak point phase theta represents the phase relation between the current unbalance phase and the vibration sensor, and the amplitude represents the magnitude of the unbalance;
at equilibrium characteristic data V Z In the step (theta), the peak point phase theta represents the phase relation between the current unbalance phase and the vibration sensor, and the amplitude represents the magnitude of the unbalance.
10. A dynamic balance correction system of a CT scanning apparatus using the dynamic balance correction method according to claim 8 or 9, comprising:
a vibration sensor for monitoring a waveform of vibration VR in a first direction and a waveform of vibration VZ in a second direction during rotation of the rotor;
a phase vibration processing module for forming balance characteristic data V according to VR based on rotation angle information theta of the rotary encoder synchronous with the rotation of the rotor R (theta), forming equilibrium characteristics data V from VZ Z (θ)；
A balance analysis module based on balance characteristic data V R (theta) and V Z (theta) performing balance adjustment analysis and determining adjustment modes of the first counterweight member and the second counterweight member;
the balance analysis module includes:
a vibration analysis unit for analyzing the balance characteristic data V R (theta) and equilibrium feature data V Z (theta) analyzing to obtain a vibration characteristic state related to the balance state, and quantitatively judging whether the related vibration characteristic state reaches balance or not;
the state management unit is used for recording two current and historical states: a mass distribution state and an equilibrium state corresponding to the mass distribution state;
the balance adjusting unit outputs an adjusting scheme and executes adjusting control operation when the vibration analyzing unit judges that the balance is not reached; the determination of the adjustment scheme is given by performing feature learning based on all the mass distribution states recorded in the state management unit and the balance state corresponding to the mass distribution state;
after the adjustment scheme is executed, the state management unit updates the current quality distribution state and the balance state corresponding to the quality distribution state.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116098644A (en) * | 2023-04-14 | 2023-05-12 | 赛诺威盛科技(北京)股份有限公司 | CT scanning equipment-based dynamic balance measurement architecture, CT scanning equipment-based dynamic balance measurement method and CT system |
| CN116115247A (en) * | 2023-04-14 | 2023-05-16 | 赛诺威盛科技(北京)股份有限公司 | CT equipment scanning frame balancing mechanism, dynamic balance automatic adjusting system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116098644A (en) * | 2023-04-14 | 2023-05-12 | 赛诺威盛科技(北京)股份有限公司 | CT scanning equipment-based dynamic balance measurement architecture, CT scanning equipment-based dynamic balance measurement method and CT system |
| CN116115247A (en) * | 2023-04-14 | 2023-05-16 | 赛诺威盛科技(北京)股份有限公司 | CT equipment scanning frame balancing mechanism, dynamic balance automatic adjusting system and method |
| CN116115247B (en) * | 2023-04-14 | 2023-06-30 | 赛诺威盛科技(北京)股份有限公司 | CT equipment scanning frame balancing mechanism, dynamic balance automatic adjusting system and method |
| CN116098644B (en) * | 2023-04-14 | 2023-06-30 | 赛诺威盛科技(北京)股份有限公司 | CT scanning equipment-based dynamic balance measurement architecture, CT scanning equipment-based dynamic balance measurement method and CT system |
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