CT dynamic balance correction method and system

Abstract

The invention belongs to the technical field of CT scanners. The CT dynamic balance correction method comprises the steps that under the condition that a CT scanner body is in initial static balance, according to the initial position of an initial balance weight on a track, the size and the position of a balance weight needing to be added / subtracted corresponding to a plane I and a plane II are determined, and the plane I and the plane II represent two planes perpendicular to the Z axis under the condition that the CT scanner body is arranged in a coordinate system; on the plane I and the plane II, the size and the position of the counter weight needing to be added / reduced are decomposed to the plane I and the plane II, and decomposition results are obtained; according to the decomposition result, the weight and Z-axis coordinates of a target balance weight needing to be added to a track are obtained, the track indicates that the weight of the target balance weight slides between the plane I and the plane II, and the weight of the target balance weight indicates the sum of the weight needing to be added / subtracted on the plane I and the weight needing to be added / subtracted on the plane II; and adjusting on the track according to the Z-axis coordinates of the target counterweights to obtain the target positions of the plurality of target counterweights.

Description

Technical Field

[0001] The present application belongs to the technical field of CT scanners, and in particular, relates to a CT dynamic balance correction method and system. Background Art

[0002] CT scanners play a vital role in medical diagnosis. Their stability and precision directly determine the quality of imaging and the accuracy of diagnosis. Due to imperfections in the manufacturing and assembly process, the core components of CT scanners, including the X-ray tube and detector system, may become unbalanced when running at high speeds, which can cause vibration, noise and image distortion, thus affecting the diagnosis results. Therefore, dynamic balancing is a key step to ensure the normal operation and image quality of CT scanners.

[0003] The traditional dynamic balancing correction method mainly eliminates the imbalance by adding or removing weight from the machine, but this method has many inconveniences. The operation process is cumbersome, time-consuming and labor-intensive, and requires the handling and operation of large mass counterweights, which places high demands on both the operator and the operation location. In addition, this method is inefficient and difficult to adapt to the fast-paced medical environment. Therefore, improving the CT dynamic balancing correction method to make it simpler and more efficient has become an important issue in improving the performance of medical equipment. There is an urgent need for a new correction method that can reduce the difficulty and complexity of operation, improve the dynamic balancing efficiency of production and after-sales, and meet the needs of modern medical equipment for high efficiency and high precision. Summary of the invention

[0004] Based on this, it is necessary to provide a CT dynamic balance correction method and system to address the above technical issues.

[0005] In a first aspect, the present application provides a CT dynamic balance correction method, the method comprising: When the CT scanner body is initially statically balanced, the size and position of the counterweight to be added / subtracted corresponding to plane I and plane II are determined according to the initial position of the initial counterweight on the track, wherein plane I and plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system; On the plane I and the plane II, respectively, the size and position of the counterweight to be added / reduced are decomposed on the plane I and the plane II to obtain a decomposition result; According to the decomposition result, the weight and Z-axis coordinate of the target counterweight to be added on the track are obtained, wherein the track represents the weight of the target counterweight sliding track between the plane I and the plane II, and the weight of the target counterweight represents the sum of the counterweight to be added / subtracted on the plane I and the counterweight to be added / subtracted on the plane II; According to the Z-axis coordinate of the target counterweight, adjustments are made on the track to obtain target positions of several target counterweights.

[0006] In some practicable embodiments, when the CT scanner body is initially statically balanced, the step of determining the size and position of the counterweight to be added / subtracted corresponding to the plane I and the plane II according to the initial position of the initial counterweight on the track includes: When it is known that the initial counterweight is located at the initial position of the track, the CT scanner body is subjected to preliminary static balancing to obtain the weight of the initial counterweight; wherein the track is parallel and symmetrically distributed on the left and right sides of the rotor of the CT scanner body. If there are two initial counterweights, the weight calculation formula of the two initial counterweights is: ; in, For components The weight, For components Position vector; is the weight of the initial counterweight on the left side of the rotor, is the weight of the initial counterweight on the right side of the rotor, Parts Position vector, is the maximum weight that can be added.

[0007] In some practicable manners, the step of decomposing the size and position of the weight to be added / reduced on the plane I and the plane II respectively to obtain the decomposition result includes: Acquiring an initial vibration value of the CT scanner body; Obtaining the vibration value I of the plane I after adding the trial weight I; Obtain the vibration value II after adding the test weight II to the plane II; Determining a system influence coefficient according to the initial vibration value, the vibration value I and the vibration value II; According to the system influence coefficient, the decomposition results of the size and position of the counterweight to be added / reduced on the plane I and the plane II are obtained.

[0008] In some practicable manners, the step of adjusting on the track according to the Z-axis coordinate of the target counterweight to obtain the target positions of the target counterweights includes: If the number of the plurality of target weights between the plane I and the plane II is two: The calculation formulas for the counterweight of plane I and the counterweight of plane II are: ; ; The distance of the target weight on the plane I side and the distance on the plane II side are: ; ; in, Indicates the target weight on the right side, represents the weight of the right target counterweight in plane I, represents the weight of the right target weight in plane II, Indicates the left target weight, represents the weight of the left target counterweight on plane I, represents the weight of the left target counterweight in plane II, represents the Z-axis coordinate of the plane I, represents the Z-axis coordinate of the plane II; According to the Z-axis coordinate of the plane I and the Z-axis coordinate of the plane II, calculation is performed to obtain the target positions of several target counterweights.

[0009] In a second aspect, the present application provides a CT dynamic balance correction system, characterized in that it is applied to the above-mentioned CT dynamic balance correction method, and the system includes: A CT scanner body having a plane I and a plane II, wherein the plane I and the plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system; A plurality of tracks are arranged between the plane I and the plane II, wherein the tracks are parallel to the Z-axis tracks, and the two ends of the tracks are respectively connected to the plane I and the plane II; An initial counterweight and a positioning mechanism are provided in the track, and the positioning mechanism can adjust the position of the initial counterweight in the track; wherein the initial counterweight is located at an initial position in the track, and the weight of the initial counterweight is the weight that enables the CT scanner body to be in a preliminary static balance; when the amount of counterweight to be added / subtracted in the plane I and the plane II is known, the weight of the initial counterweight is adjusted to form a target counterweight weight; A control system connected to the positioning mechanism, wherein the control system is configured as follows: When the CT scanner body is initially statically balanced, the size and position of the counterweight to be added / subtracted corresponding to the plane I and the plane II are determined according to the initial position of the initial counterweight on the track, wherein the plane I and the plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system; On the plane I and the plane II, respectively, the size and position of the counterweight to be added / reduced are decomposed on the plane I and the plane II to obtain a decomposition result; According to the decomposition result, the weight and Z-axis coordinate of the target counterweight to be added on the track are obtained, wherein the track represents the weight of the target counterweight sliding track between the plane I and the plane II, and the weight of the target counterweight represents the sum of the counterweight to be added / subtracted on the plane I and the counterweight to be added / subtracted on the plane II; According to the Z-axis coordinate of the target counterweight, adjustments are made on the track to obtain target positions of several target counterweights.

[0010] In some practicable manners, the center of the plurality of tracks is the initial position; the plurality of tracks are parallel and symmetrically distributed on the left and right sides of the rotor of the CT scanner body; The control system is also configured to: When it is known that the initial counterweight is located at the initial position of the track, the CT scanner body is initially statically balanced to obtain the weight of the initial counterweight; if there are two initial counterweights, the weight calculation formula of the two initial counterweights is: ; in, For components The weight, For components Position vector; is the weight of the initial counterweight on the left side of the rotor, is the weight of the initial counterweight on the right side of the rotor, Parts Position vector, is the maximum weight that can be added.

[0011] In some embodiments, the control system is further configured as follows: Acquiring an initial vibration value of the CT scanner body; Obtaining the vibration value I of the plane I after adding the trial weight I; Obtain the vibration value II after adding the test weight II to the plane II; Determining a system influence coefficient according to the initial vibration value, the vibration value I and the vibration value II; According to the system influence coefficient, the decomposition results of the size and position of the counterweight to be added / reduced on the plane I and the plane II are obtained.

[0012] In some embodiments, the control system is further configured as follows: If the number of the plurality of target weights between the plane I and the plane II is two: The calculation formulas for the counterweight of plane I and the counterweight of plane II are: ; ; The distance of the target weight on the plane I side and the distance on the plane II side are: ; ; in, Indicates the target weight on the right side, represents the weight of the right target counterweight on plane I, represents the weight of the right target weight in plane II, Indicates the left target weight, represents the weight of the left target counterweight on plane I, represents the weight of the left target weight in plane II, represents the Z-axis coordinate of the plane I, represents the Z-axis coordinate of the plane II; According to the Z-axis coordinate of the plane I and the Z-axis coordinate of the plane II, calculation is performed to obtain the target positions of several target counterweights.

[0013] Beneficial effect: The present application provides a CT dynamic balance correction system, comprising a CT scanner body, having a plane I and a plane II, wherein the plane I and the plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system; a plurality of tracks are arranged between the plane I and the plane II, the track is parallel to the track of the Z axis, and its two ends are respectively connected from plane I to plane II; an initial counterweight and a positioning mechanism are arranged in the track, and the positioning mechanism can adjust the position of the initial counterweight in the track; wherein the initial counterweight is located at an initial position in the track, and the weight of the initial counterweight is the weight that the CT scanner body can be in a preliminary static balance state; when the amount of counterweight to be added / subtracted in plane I and plane II is known, the weight of the initial counterweight is adjusted to form a target counterweight weight; a control system is connected to the positioning mechanism, wherein the control system is applied to the CT dynamic balance correction method, and is configured as follows: a control system is connected to the positioning mechanism, and In the embodiment, the control system is configured as follows: when the CT scanner body is initially statically balanced, according to the initial position of the initial counterweight on the track, the size and position of the counterweight to be added / subtracted corresponding to the plane I and the plane II are determined, wherein the plane I and the plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in the coordinate system; on the plane I and the plane II, the size and position of the counterweight to be added / subtracted are decomposed to the plane I and the plane II respectively to obtain the decomposition result; according to the decomposition result, the weight and Z-axis coordinate of the target counterweight to be added on the track are obtained, wherein the track represents the weight of the target counterweight sliding track between the plane I and the plane II, and the weight of the target counterweight represents the sum of the counterweight to be added / subtracted on the plane I and the counterweight to be added / subtracted on the plane II; according to the Z-axis coordinate of the target counterweight, adjustments are made on the track to obtain the target positions of several target counterweights. The above method can be used to calculate the weight that needs to be added or reduced at the adjustable counterweight position, as well as the position of the center of gravity. Finally, the counterweight is driven by the positioning mechanism to move the counterweight to the target position and lock it. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 is a flow chart of a CT dynamic balance correction method in one embodiment; Figure 2A schematic diagram of a plane of a CT dynamic balance correction system in a coordinate system in one embodiment; Figure 3 A schematic diagram of adding / removing counterweight in dynamic balancing of a CT dynamic balancing correction system in one embodiment; Figure 4 A schematic diagram of a Z-axis coordinate adjustment counterweight for a CT dynamic balance correction system in one embodiment; Figure 5 It is a structural schematic diagram of a CT dynamic balance correction system in one embodiment; Figure 6 The figure is a schematic diagram of the overall process of a CT dynamic balance correction system in one embodiment. DETAILED DESCRIPTION

[0016] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all couplings of one or more related listed items.

[0018] It can be understood that the terms "first", "second", etc. used in the present application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0019] Some terms involved in this application are explained below to facilitate understanding of this application: Unbalance is a term used in rotating machinery. It refers to the phenomenon that the mass distribution of rotating parts (such as rotors, shafts, turbines, etc.) is uneven, resulting in the center of mass (center of gravity) not coinciding with the center of the rotating shaft. This uneven mass distribution will generate centrifugal force during rotation, causing vibration.

[0020] like Figures 1 to 6 As shown, in a first aspect, the present application provides a CT dynamic balance correction method, the method comprising: S100, when the CT scanner body is initially statically balanced, the size and position of the counterweight to be added / subtracted corresponding to plane I and plane II are determined according to the initial position of the initial counterweight on the track.

[0021] The plane I and the plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system.

[0022] Exemplarily, plane I and plane II may be two opposite end surfaces of the CT scanner body.

[0023] Step S100 may include the following steps: When it is known that the initial counterweight is located at the initial position of the track, the CT scanner body is subjected to preliminary static balancing to obtain the weight of the initial counterweight; wherein the track is parallel and symmetrically distributed on the left and right sides of the rotor of the CT scanner body. If there are two initial counterweights, the weight calculation formula of the two initial counterweights is: ; in, For components The weight, For components Position vector; is the weight of the initial counterweight on the left side of the rotor, is the weight of the initial counterweight on the right side of the rotor, Parts Position vector, is the maximum weight that can be added.

[0024] It should be noted that since the CT scanner body itself is a precision instrument, if counterweights are directly added and then the dynamic balance vibration value is measured, the CT scanner body may be damaged due to improper addition of counterweights. Therefore, before performing a dynamic balance test, a static balance test should be performed first to ensure that the quality of the added counterweights will not cause vibration damage to the CT scanner body.

[0025] This application is exemplified with two initial counterweights, which can be adjusted as needed, for example, the number of initial counterweights is 2, 3, 4, 5, 6, 7, 8, etc. The weight calculation formula of the two initial counterweights ensures that the torque of the CT scanner body is balanced in the initial static balance state, thereby avoiding equipment damage caused by unbalanced torque. In this way, dynamic balance testing can be achieved without damaging the CT scanner body. This method of performing a static balance test first is based on considerations for the precision of the CT scanner body to ensure that the added counterweights in the dynamic balance test will not cause damage to the equipment.

[0026] S200, decomposing the size and position of the counterweight to be added / reduced on the plane I and the plane II respectively to obtain a decomposition result.

[0027] Specifically, obtaining the decomposition result may include the following steps: S201, obtaining an initial vibration value of the CT scanner body.

[0028] S202, obtaining the vibration value I of the plane I after adding the trial weight I.

[0029] S203, obtaining the vibration value II after adding the trial weight II to the plane II.

[0030] S204: Determine the system influence coefficients of the plane I and the plane II according to the initial vibration value, the vibration value I, and the vibration value II.

[0031] S205, obtaining decomposition results of the size and position of the counterweight to be added / reduced on the plane I and the plane II according to the system influence coefficient.

[0032] Exemplarily, in obtaining the size and position of the weight to be added / subtracted on the plane I and the plane II, the calculation formula for adding / subtracting the weight is: Using the sensors inside the CT scanner body, collect the initial vibration values ​​of measurement points 1 and 2 .

[0033] Plane I adds test weight and measures vibration value after adding test weight , try weight .

[0034] Plane II adds test weight and measures vibration value after adding test weight , try weight .

[0035] Calculate the influence coefficient, the system influence coefficient of plane I adding test weight on measuring point 1 and measuring point 2:

[0036] Calculate the influence coefficient, and add the system influence coefficient of plane II to test points 1 and 2:

[0037] Calculate the weight of the counterweight, , The weight to be added / reduced for plane I and plane II is as follows: , as well as the system influence coefficient, determine the decomposition result of the size and position of the counterweight to be added / subtracted.

[0038] It should be noted that the influence coefficient Respectively represent the influence of adding test weight on plane I and plane II on the vibration value of measuring point 1 and measuring point 2. These influence coefficients describe the contribution of adding weight on a specific plane to the vibration response.

[0039] By solving the linear equations , Indicates the size and position of the counterweight that needs to be added / subtracted on Plane I and Plane II.

[0040] Next, the decomposed result of the size and position of the counterweight to be added / reduced is compared and adjusted with the initial counterweight to obtain the target counterweight. For example, the initial counterweight refers to the weight of the counterweight already present on the CT scanner body before any adjustment is made. ) is calculated based on the vibration value and the influence coefficient, indicating the amount of counterweight that needs to be added or reduced on plane I and plane II to achieve dynamic balance. For plane I, if If it is a positive value, it means that the counterweight needs to be increased; if it is a negative value, it means that the counterweight needs to be reduced. Similarly, for plane II, The positive and negative values ​​of also indicate the need to increase or decrease the counterweight. The counterweight that needs to be adjusted on each plane is calculated, that is, the difference between the counterweight to be added / reduced and the initial counterweight. Based on the calculated counterweight adjustment amount, the initial counterweight on the CT scanner body is actually increased or decreased.

[0041] S300: Obtain the weight and Z-axis coordinate of the target counterweight to be added to the track according to the decomposition result.

[0042] Among them, the track represents the weight of the target counterweight sliding track between the plane I and the plane II, and the weight of the target counterweight represents the sum of the counterweight to be added / subtracted on the plane I and the counterweight to be added / subtracted on the plane II.

[0043] Specifically, step S300 may include the following steps: S301, if the number of the plurality of target weights between the plane I and the plane II is two: The calculation formulas for the counterweight of plane I and the counterweight of plane II are: ; ; The distance of the target weight on the plane I side and the distance on the plane II side are: ; ; in, Indicates the target weight on the right side, represents the weight of the right target counterweight in plane I, represents the weight of the right target weight in plane II, Indicates the left target weight, represents the weight of the left target counterweight on plane I, represents the weight of the left target weight in plane II, represents the Z-axis coordinate of the plane I, Represents the Z-axis coordinate of the plane II.

[0044] It is understandable that the target amount of weight can be adjusted as needed.

[0045] S302, calculating according to the Z-axis coordinate of the plane I and the Z-axis coordinate of the plane II to obtain target positions of a plurality of target counterweights.

[0046] Through the above process, it is possible to ensure that the target counterweight is accurately placed between plane I and plane II to achieve dynamic balancing of the CT scanner. This method improves the stability of the device and ensures the imaging quality and diagnostic accuracy.

[0047] S400, adjusting on the track according to the Z-axis coordinate of the target counterweight to obtain target positions of a plurality of target counterweights.

[0048] Specifically, in the aforementioned steps, the Z-axis coordinate of the target counterweight in the track is obtained, so that the target counterweight is adjusted accordingly on the track so that the target counterweight is located at the coordinate on the Z-axis to achieve CT dynamic balance correction.

[0049] like Figures 2 to 6 In a second aspect, the present application provides a CT dynamic balance correction system, which is applied to the aforementioned CT dynamic balance correction method, and the system includes: A CT scanner body having a plane I and a plane II, wherein the plane I and the plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system; A plurality of tracks are arranged between the plane I and the plane II, wherein the tracks are parallel to the Z-axis tracks, and the two ends of the tracks are respectively connected to the plane I and the plane II; An initial counterweight and a positioning mechanism are provided in the track, and the positioning mechanism can adjust the position of the initial counterweight in the track; wherein the initial counterweight is located at an initial position in the track, and the weight of the initial counterweight is the weight that enables the CT scanner body to be in a preliminary static balance; when the amount of counterweight to be added / subtracted in the plane I and the plane II is known, the weight of the initial counterweight is adjusted to form a target counterweight weight; A control system connected to the positioning mechanism, wherein the control system is configured as follows: When the CT scanner body is initially statically balanced, the size and position of the counterweight to be added / subtracted corresponding to the plane I and the plane II are determined according to the initial position of the initial counterweight on the track, wherein the plane I and the plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system; On the plane I and the plane II, respectively, the size and position of the counterweight to be added / reduced are decomposed on the plane I and the plane II to obtain a decomposition result; According to the decomposition result, the weight and Z-axis coordinate of the target counterweight to be added on the track are obtained, wherein the track represents the weight of the target counterweight sliding track between the plane I and the plane II, and the weight of the target counterweight represents the sum of the counterweight to be added / subtracted on the plane I and the counterweight to be added / subtracted on the plane II; According to the Z-axis coordinate of the target counterweight, adjustments are made on the track to obtain target positions of several target counterweights.

[0050] It should be noted that, for the configuration of the control system, reference can be made to the aforementioned CT dynamic balance correction method, which will not be elaborated here. However, it should be clarified that the adjustment from the initial counterweight to the target counterweight can be performed through manual participation. For example, when the target counterweight is different from the initial counterweight, the control system can display the weight value of the target counterweight, such as through a display, displaying the weight (also called mass) of the target counterweight. In this way, the staff can replace the initial counterweight according to the target weight value displayed on the display.

[0051] It should also be noted that the positioning mechanism may include a motor and a lead screw, and the track may be understood as a guide rail.

[0052] A counterweight is arranged on the lead screw, and the motor drives the lead screw to rotate, and the lead screw transmits the counterweight to the target position, thereby achieving dynamic balance of the CT scanner body; in addition, the control system can be a computer.

[0053] In one embodiment, the center of the plurality of tracks is the initial position; the plurality of tracks are parallel and symmetrically distributed on the left and right sides of the rotor of the CT scanner body; The control system is also configured to: When it is known that the initial counterweight is located at the initial position of the track, the CT scanner body is initially statically balanced to obtain the weight of the initial counterweight; if there are two initial counterweights, the weight calculation formula of the two initial counterweights is: ; in, For components The weight, For components Position vector; is the weight of the initial counterweight on the left side of the rotor, is the weight of the initial counterweight on the right side of the rotor, Parts Position vector, is the maximum weight that can be added.

[0054] It should be noted that the center of the track is the initial position, and the center of gravity of the initial counterweight or the target counterweight is located at the center of the track. For the configuration of the control system, reference may be made to the aforementioned CT dynamic balance correction method, which will not be described in detail here.

[0055] In one embodiment, the control system is further configured to: Acquiring an initial vibration value of the CT scanner body; Obtaining the vibration value I of the plane I after adding the trial weight I; Obtain the vibration value II after adding the test weight II to the plane II; Determining a system influence coefficient according to the initial vibration value, the vibration value I and the vibration value II; According to the system influence coefficient, the decomposition results of the size and position of the counterweight to be added / reduced on the plane I and the plane II are obtained.

[0056] It should be noted that, for the configuration of the control system, reference can be made to the aforementioned CT dynamic balance correction method, which will not be described in detail here. As mentioned above, for adjusting the initial counterweight to the target counterweight, the control system can generate a signal carrying the target counterweight weight, and use relevant conversion equipment to display the information on the display screen so that the staff can replace the initial counterweight to the target counterweight.

[0057] In one embodiment, the control system is further configured to: If the number of the plurality of target weights between the plane I and the plane II is two: The calculation formulas for the counterweight of plane I and the counterweight of plane II are: ; ; The distance of the target weight on the plane I side and the distance on the plane II side are: ; ; in, Indicates the target weight on the right side, represents the weight of the right target counterweight in plane I, represents the weight of the right target weight in plane II, Indicates the left target weight, represents the weight of the left target counterweight on plane I, represents the weight of the left target counterweight in plane II, represents the Z-axis coordinate of plane I, Represents the Z-axis coordinate of plane II; According to the Z-axis coordinate of the plane I and the Z-axis coordinate of the plane II, calculation is performed to obtain the target positions of several target counterweights.

[0058] It should be noted that, for the configuration of the control system, reference may be made to the aforementioned CT dynamic balance correction method, which will not be elaborated here. Example

[0059] The present application proposes a CT dynamic balance correction system, which may include the following process after the CT dynamic balance correction is performed: Static balance: There are two places on the CT scanner body where you can add or remove weights, such as Figure 2 , which are distributed parallel and symmetrically on the left and right sides of the rotor and fixed between planes I and II. Before the actual dynamic balancing, preliminary static balancing is also required to prevent the CT scanner body from vibrating and damaging during rotation due to excessive initial imbalance and causing dangerous accidents. Given the detailed mass and center of mass information of each component of the system (the component refers to the original component on the CT scanner body), the mass of the counterweight that needs to be added to achieve preliminary static balance can be calculated: ; In the formula, is the mass of component i, is its position vector; is the mass of the left counterweight, is the mass of the right side counterweight, are their position vectors, is the maximum mass that can be added.

[0060] Dynamic balance After completing the initial static balance, dynamic balance is performed according to the principle of the dual-plane influence coefficient method. The CT scanner body is started and operated at the working speed. The internal sensor of the CT scanner body collects the vibration value. Subsequently, two test weights are added and measured. Finally, the weight to be added / reduced on the two planes is obtained through computer signal processing and calculation. (two-dimensional vector, including size and phase information). Since the position where the weight can be added on the CT scanner body is fixed, it is necessary to further decompose the weight that should be added or reduced at each of the two points, such as Figure 3As shown. After the decomposition is completed, we can get (The superscript represents the plane, and the subscript represents the position of the counterweight), and the added / reduced counterweight on the left and right sides can be expressed as:

[0061] It is true on the X, Y plane, but it still needs to be determined The z-axis coordinate of Figure 4 As shown:

[0062] Calculated After that, the computer transmits the command to the motor, and the automatic balancing is achieved through the lead screw guide. Figure 5 shown.

[0063] The overall process of a CT dynamic balance correction system is as follows: Figure 6 shown. Figure 6 In the process, the component mass and center of mass information are first input into the system, the mass of the counterweight to be added is calculated, and then the counterweight is added to complete the preliminary static balance, and the vibration measurement is performed. According to the vibration measurement results, signal processing and dual-plane influence coefficient method are performed to obtain the weight that should be added / subtracted on the two planes, and the corresponding addition / subtraction of the counterweight is decomposed and calculated. After the decomposition calculation results are obtained, the left and right side counterweight masses and z-axis position adjustment instructions are formed according to the calculation results, and the computer is used to send instructions to the motor to move the counterweight. Finally, the running results of the dynamic balancing correction are detected. If the vibration amount is less than the allowable value, the dynamic balancing correction is completed. Otherwise, signal processing and dual-plane influence coefficient method calculation are performed.

[0064] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0065] The various embodiments in the present disclosure are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0066] The protection scope of the present disclosure is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the scope and spirit of the present disclosure. If these changes and modifications fall within the scope of the claims of the present disclosure and their equivalents, the intention of the present disclosure also includes these changes and modifications.

Claims

1. A CT dynamic balance correction method, characterized in that the method include: When the CT scanner body is initially statically balanced, the size and position of the counterweight to be added / subtracted corresponding to plane I and plane II are determined according to the initial position of the initial counterweight on the track, wherein plane I and plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system; On the plane I and the plane II, respectively, the size and position of the counterweight to be added / reduced are decomposed on the plane I and the plane II to obtain a decomposition result; According to the decomposition result, the weight and Z-axis coordinate of the target counterweight to be added on the track are obtained, wherein the track represents the weight of the target counterweight sliding track between the plane I and the plane II, and the weight of the target counterweight represents the sum of the counterweight to be added / subtracted on the plane I and the counterweight to be added / subtracted on the plane II; According to the Z-axis coordinate of the target counterweight, adjustments are made on the track to obtain target positions of several target counterweights.

2. The CT dynamic balance correction method according to claim 1, characterized in that: The step of determining the size and position of the counterweight to be added / subtracted corresponding to the plane I and the plane II according to the initial position of the initial counterweight on the track when the CT scanner body is initially statically balanced comprises: When it is known that the initial counterweight is located at the initial position of the track, the CT scanner body is subjected to preliminary static balancing to obtain the weight of the initial counterweight; wherein the track is parallel and symmetrically distributed on the left and right sides of the rotor of the CT scanner body. If there are two initial counterweights, the weight calculation formula of the two initial counterweights is: ； ； in, For components The weight, For components Position vector; is the weight of the initial counterweight on the left side of the rotor, is the weight of the initial counterweight on the right side of the rotor, Parts Position vector, is the maximum weight that can be added.

3. The CT dynamic balance correction method according to claim 2, characterized in that: The step of decomposing the size and position of the counterweight to be added / reduced on the plane I and the plane II respectively to obtain the decomposition result comprises: Acquiring an initial vibration value of the CT scanner body; Obtaining the vibration value I of the plane I after adding the trial weight I; Obtain the vibration value II after adding the test weight II to the plane II; Determining a system influence coefficient according to the initial vibration value, the vibration value I and the vibration value II; According to the system influence coefficient, the decomposition results of the size and position of the counterweight to be added / reduced on the plane I and the plane II are obtained.

4. The CT dynamic balance correction method according to claim 1, characterized in that: The step of adjusting on the track according to the Z-axis coordinate of the target counterweight to obtain the target positions of a plurality of target counterweights comprises: If the number of the plurality of target weights between the plane I and the plane II is two: The calculation formulas for the counterweight of plane I and the counterweight of plane II are: ； ； The distance of the target weight on the plane I side and the distance on the plane II side are: ； ； in, Indicates the target weight on the right side, represents the weight of the right target counterweight on plane I, represents the weight of the right target weight in plane II, Indicates the left target weight, represents the weight of the left target counterweight on plane I, represents the weight of the left target counterweight in plane II, represents the Z-axis coordinate of the plane I, represents the Z-axis coordinate of the plane II; According to the Z-axis coordinate of the plane I and the Z-axis coordinate of the plane II, calculation is performed to obtain the target positions of several target counterweights.

5. A CT dynamic balance correction system, characterized in that: The CT dynamic balance correction method applied to any one of claims 1 to 4, the system comprising: A CT scanner body having a plane I and a plane II, wherein the plane I and the plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system; A plurality of tracks are arranged between the plane I and the plane II, wherein the tracks are parallel to the track of the Z axis, and the two ends of the tracks are respectively connected to the plane I and the plane II; An initial counterweight and a positioning mechanism are provided in the track, and the positioning mechanism can adjust the position of the initial counterweight in the track; wherein the initial counterweight is located at an initial position in the track, and the weight of the initial counterweight is the weight that enables the CT scanner body to be in a preliminary static balance; when the amount of counterweight to be added / subtracted in the plane I and the plane II is known, the weight of the initial counterweight is adjusted to form a target counterweight weight; A control system connected to the positioning mechanism, wherein the control system is configured as follows: When the CT scanner body is initially statically balanced, the size and position of the counterweight to be added / subtracted corresponding to the plane I and the plane II are determined according to the initial position of the initial counterweight on the track, wherein the plane I and the plane II represent two planes perpendicular to the Z axis when the CT scanner body is arranged in a coordinate system; On the plane I and the plane II, respectively, the size and position of the counterweight to be added / reduced are decomposed on the plane I and the plane II to obtain a decomposition result; According to the decomposition result, the weight and Z-axis coordinate of the target counterweight to be added on the track are obtained, wherein the track represents the weight of the target counterweight sliding track between the plane I and the plane II, and the weight of the target counterweight represents the sum of the counterweight to be added / subtracted on the plane I and the counterweight to be added / subtracted on the plane II; According to the Z-axis coordinate of the target counterweight, adjustments are made on the track to obtain target positions of several target counterweights.

6. The CT dynamic balance correction system according to claim 5, characterized in that: The centers of the plurality of tracks are the initial positions; the plurality of tracks are parallel and symmetrically distributed on the left and right sides of the rotor of the CT scanner body; The control system is also configured to: When it is known that the initial counterweight is located at the initial position of the track, the CT scanner body is initially statically balanced to obtain the weight of the initial counterweight; if there are two initial counterweights, the weight calculation formula of the two initial counterweights is: ； in, For components The weight, For components Position vector; is the weight of the initial counterweight on the left side of the rotor, is the weight of the initial counterweight on the right side of the rotor, Parts Position vector, is the maximum weight that can be added.

7. The CT dynamic balance correction system according to claim 6, characterized in that: The control system is also configured to: Acquiring an initial vibration value of the CT scanner body; Obtaining the vibration value I of the plane I after adding the trial weight I; Obtain the vibration value II after adding the test weight II to the plane II; Determining a system influence coefficient according to the initial vibration value, the vibration value I and the vibration value II; According to the system influence coefficient, the decomposition results of the size and position of the counterweight to be added / reduced on the plane I and the plane II are obtained.

8. The CT dynamic balance correction system according to claim 6, characterized in that: The control system is also configured to: If the number of the plurality of target weights between the plane I and the plane II is two: The calculation formulas for the counterweight of plane I and the counterweight of plane II are: ； ； The distance of the target weight on the plane I side and the distance on the plane II side are: ； ； in, Indicates the target weight on the right side, represents the weight of the right target counterweight on plane I, represents the weight of the right target weight in plane II, Indicates the left target weight, represents the weight of the left target counterweight on plane I, represents the weight of the left target counterweight in plane II, represents the Z-axis coordinate of the plane I, represents the Z-axis coordinate of the plane II; According to the Z-axis coordinate of the plane I and the Z-axis coordinate of the plane II, calculation is performed to obtain the target positions of several target counterweights.

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