Revolving body balancing device and balancing method

Abstract

The invention discloses a revolving body balancing device and balancing method, belongs to the technical field of nondestructive testing, and is used for solving the problem of unbalanced rotation of a revolving body of large nondestructive testing equipment. The revolving body balancing device comprises a balancing unit, a force application unit, a guide unit and a mounting frame, the balancing unit comprises an eccentric gear which is used for being meshed with a driven gear of the rotating body. According to the revolving body balancing device and the revolving body balancing method, self-adaptive rotating balance of the revolving body can be achieved, the scanning precision is improved, and the quality and the service life of key parts of products are guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of nondestructive testing, and relates to a rotating body balancing device and a balancing method. Background Art

[0002] For the ray source and detector rotating body of a vertical nondestructive testing system, since there is usually a deviation between the center of mass and the rotation center of the rotating body, the rotating body will be unbalanced due to eccentricity during rotation, resulting in poor rotation accuracy and thus affecting the product performance index.

[0003] Currently, for the ray source and detector rotating body of a vertical CT testing system in the market, the maximum diameter of the rotating profile does not exceed 2500 mm, the mass of the rotating body is generally less than 1.5 t, the energy of the ray source generally does not exceed 450 kv, and the rotation drive of the rotating body is generally belt drive. The belt is tightened by a tensioning pulley to achieve the control of the motion accuracy of rotation. The weight and size of the rotor are relatively small, and the balance adjustment of the rotor rotation can generally be achieved by adding or subtracting counterweights and measuring the thrust difference in the tangential direction of rotation at specific points not exceeding a certain value.

[0004] However, for the rotating body of a large nondestructive testing device, for example, the rotating profile of the rotating body is Ф8000 mm and the mass of the rotating body is 4 t. If the balance is still adjusted by repeatedly carrying and loading counterweights, the workload is extremely large, the adjustment period is long, and the production efficiency is extremely low. Summary of the Invention

[0005] In view of the above analysis, the present invention aims to provide a rotating body balancing device and a balancing method to solve the problem of unbalanced rotation of the rotating body of a large nondestructive testing device.

[0006] The object of the present invention is mainly achieved by the following technical solutions.

[0007] In a first aspect of the present invention, a rotating body balancing device is provided, including a balancing unit; the balancing unit can apply a reverse torque to the rotating body that is balanced with the deflection torque generated by the center of mass of the rotating body.

[0008] Further, it further includes a force application unit for applying a thrust towards the rotating body to the balancing unit.

[0009] Further, it further includes a mounting bracket for fixedly connecting with the rotating body.

[0010] Further, the force application unit includes a first mounting seat fixedly connected with the mounting bracket.

[0011] Further, the force application unit further includes an elastic component; the elastic component is used to apply a thrust to the balancing unit.

[0012] Further, the force application unit further includes an adjustment member, and the other end of the elastic member abuts against one end of the adjustment member.

[0013] Further, a threaded hole is formed in the first mounting seat; the other end of the adjustment member is threadedly connected to the threaded hole.

[0014] Further, the balancing unit includes an eccentric gear, and the eccentric gear is used for meshing with the driven gear of the rotating body.

[0015] Further, the balancing unit further includes a second mounting seat, the second mounting seat includes an extrusion member, and the extrusion member presses against the other end of the elastic member.

[0016] Further, a guiding unit is further included, the guiding unit includes a guide rail and a slider; the second mounting seat is fixedly connected to the slider.

[0017] Further, the adjustment member further includes a baffle, the baffle is located on the outer periphery of the adjustment member and is arranged between the elastic member and the first mounting seat.

[0018] On the other hand, the present invention discloses a method for balancing a non-destructively detected rotating body, adopting any one of the rotating body balancing devices in the first aspect of the present invention, including the following steps:

[0019] Step S100 detects the position where the centroid of the rotating body is located, and sets a centroid position mark M at the position where the centroid is located according to the detection result;

[0020] Step S200 assembles the rotating body balancing device according to the position of the centroid position mark M;

[0021] Step S300 starts the non-destructive testing equipment to rotate the rotating body;

[0022] Step S400 enables the rotating body balancing device to achieve adaptive balance during the rotation of the rotating body.

[0023] Further, in step S100, the position where the centroid of the rotating body is located is determined by monitoring the current value of the motor.

[0024] Further, step S100 includes the following sub-steps:

[0025] S110 takes the rotation center C of the driven gear of the rotating body as the center of a circle, sets a zero angle mark M0 on the driven gear 300, and takes the initial position of the zero angle mark MO as the zero angle position of the rotating body;

[0026] S120 starts the motor to rotate the rotating body and monitors the current value of the motor;

[0027] S130 plots the current-angle curve of the motor to determine the centroid angle A where the centroid of the rotating body is located;

[0028] S140 Set the centroid position mark M at the centroid angle A on the driven gear according to the zero-angle mark M0.

[0029] Further, the assembly process of step S200 includes the following sub-steps:

[0030] S210 Rotate the rotating body so that the rotating body stops at a position where the line connecting the centroid position mark M and the rotation center C is horizontal when M rotates downward.

[0031] S220 Assemble the rotating body balancing device directly below the rotating body so that the eccentric end of the eccentric gear meshes with the driven gear.

[0032] Further, step S400 includes the following sub-steps:

[0033] S410 During the rotation of the eccentric gear, it moves up and down reciprocally, and the elastic member is repeatedly compressed and extended.

[0034] S420 The elastic member exerts an upward radial reaction force F1 on the eccentric gear according to the compression amount.

[0035] S430 The eccentric gear transmits the radial reaction force F1 to the driven gear through meshing, and part of the radial reaction force F1 is decomposed into a tangential rotational resistance F2 on the driven gear 300, so that the driven gear is subjected to a rotational resistance moment.

[0036] S440 When the line connecting the centroid position mark M of the rotating body and the rotation center C is horizontal when M rotates downward, the eccentric end of the eccentric gear meshes with the driven gear, and the compression amount of the elastic member is the largest, so that the driven gear is subjected to the maximum rotational resistance moment to balance the maximum eccentric moment received by the rotating body.

[0037] Compared with the prior art, the present invention can at least achieve one of the following beneficial effects:

[0038] 1. The rotating body balancing device of the present invention can generate an adaptive resistance moment for the eccentric moment of the rotating body by setting a balancing unit and a force application unit including an eccentric gear, so that the rotating body realizes self-adaptive rotational balance, improves the performance stability of the nondestructive testing equipment, and at the same time greatly reduces the time and resources occupied when adjusting the balance of the rotating body, and significantly improves the production efficiency.

[0039] 2. The rotating body balancing device of the present invention can make the eccentric gear move stably and smoothly along the extension of the center line by setting a guiding unit, ensuring that the rotating body balancing device generates an adaptive balance resistance moment for the rotating body.

[0040] 3. The balancing method of the rotating body of the present invention realizes self - adaptive balance during the rotation of the rotating body by installing a rotating body balancing device, improves the performance stability of the nondestructive testing equipment, and at the same time greatly reduces the time and resources occupied when adjusting the balance of the rotating body, significantly improving the production efficiency.

[0041] 4. The balancing method of the rotating body of the present invention decomposes the radial reaction force acting on the driven gear by the eccentric gear in step S400 into the tangential rotational resistance of the driven gear, achieving the effect of balancing the eccentric moment of the rotating body and realizing rotational balance.

[0042] In the present invention, the above - mentioned technical solutions can also be combined with each other to achieve more preferred combined solutions. Other features and advantages of the present invention will be described in the subsequent specification, and some advantages can be made obvious from the specification or understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained from the content specifically pointed out in the embodiments of the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is the overall structural schematic diagram of the rotating body balancing device of Embodiment 1 of the present invention;

[0044] Figure 2 It is one of the exploded structural schematic diagrams of the rotating body balancing device of Embodiment 1 of the present invention;

[0045] Figure 3 It is another exploded structural schematic diagram of the rotating body balancing device of Embodiment 1 of the present invention;

[0046] Figure 4 It is the sectional structural schematic diagram of the rotating body balancing device of Embodiment 1 of the present invention;

[0047] Figure 5 It is one of the working principle schematic diagrams of the rotating body balancing device of Embodiment 1 of the present invention;

[0048] Figure 6 It is another working principle schematic diagram of the rotating body balancing device of Embodiment 1 of the present invention;

[0049] Figure 7 It is the step schematic diagram of the rotating body balancing method of Embodiment 2 of the present invention;

[0050] Figure 8 It is the motor current - angle curve schematic diagram in step S130 of Embodiment 2 of the present invention;

[0051] Figure 9 It is the sub - step schematic diagram of step 300 of the rotating body balancing method of Embodiment 2 of the present invention.

[0052] Reference Signs:

[0053] 1-Balancing unit;

[0054] 11-eccentric gear; 111-gear spindle;

[0055] 12-second mounting seat; 121-mounting plate; 122-sleeve; 123-extrusion piece; 1231-extrusion

[0056] Block; 1232-first positioning block;

[0057] 13- bearing;

[0058] 14- spacer sleeve;

[0059] 15-locking nut;

[0060] 2-Force application unit;

[0061] 21- elastic member;

[0062] 22-first mounting seat; 221-adjusting screw hole;

[0063] 23-adjusting component; 231-second positioning block; 232-baffle;

[0064] 3-Guidance unit;

[0065] 31-guide rail;

[0066] 32-slider;

[0067] 4-Mounting frame;

[0068] 100-motor; 200-driving gear; 300-driven gear;

[0069] L1-center line; G-center of mass of rotating body; C-center of rotation C; F1-radial reaction force; F2-tangential rotation resistance. DETAILED DESCRIPTION

[0070] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0071] In the vertical non-destructive testing system, the radiation source and detector are integrated into the rotating structure, and multi-angle tomography of the workpiece is achieved through 360° continuous rotation. Due to factors such as uneven mass distribution of the internal units of the rotating body, processing and assembly errors, and long-term operation wear, there is generally a millimeter-level deviation between its actual center of mass and the theoretical center of rotation. This center of mass deviation will form periodic centrifugal force during high-speed rotation, causing core problems such as deterioration of motion accuracy, damage to the mechanical system, and surges in energy consumption and noise.

[0072] The specifications of the rotating bodies of current mainstream vertical CT systems in the market are generally as follows: the diameter of the rotating contour ≤ 2500 mm, the total mass ≤ 1.5 t, and the energy of the radiation source ≤ 450 kV. For such medium and small-sized systems, counterweight installation grooves are generally evenly distributed on the outer periphery of the rotating body. By manually increasing or decreasing counterweight blocks (the mass of a single block is 0.5 - 2 kg) and measuring the thrust difference in the tangential direction of rotation (the threshold is set at ±50 N), iterative adjustment is then carried out until the balance requirement is met.

[0073] However, this method faces fundamental challenges in large-scale scenarios. On the one hand, due to the mass-inertia amplification effect, when the specifications of the rotating body are increased to the Ф8000 mm / 4 t level, its moment of inertia (J = mR 2 ² / 2) will increase to more than 10 times that of medium and small-sized systems. The centrifugal force (F = mω 2 ²r) generated by the same centroid offset (such as 1 mm) surges according to the square relationship, and the adjustment accuracy of traditional counterweight blocks (in kg level) can no longer meet the requirement of micro-newton-meter level torque compensation. On the other hand, the Ф8000 mm rotating body needs to be equipped with hundreds of counterweight installation points. Each adjustment requires hoisting counterweight blocks of several tons, which takes more than 8 hours each time, and there are safety hazards in high-altitude operations. Taking a certain type of Ф8000 mm / 4 t non-destructive testing as an example, if the traditional manual counterweight method is used, 20 - 30 times of iterative adjustment (taking 5 - 7 days) are required to make the residual unbalance meet the standard, while medium and small-sized systems can complete the debugging of 3 - 5 devices within the same time, and the productivity gap is significant.

[0074] In view of the above problems, the exemplary embodiments of the present invention provide a rotating body balancing device and a balancing method.

[0075] Embodiment 1

[0076] This embodiment discloses a rotating body balancing device for adjusting the rotational balance of a rotating body on a non-destructive testing device driven by gears, especially for adjusting the rotational balance of a large-sized high-energy industrial CT rotating body with a rotating contour of Ф8000 mm, a rotating body mass of 4 t, and a rotating drive mode of the CT rotating body being gear drive. As Figure 1 and Figure 2 shown, the rotating body balancing device includes a balancing unit 1 and a force application unit 2; the balancing unit 1 includes an eccentric gear 11, and the eccentric gear 11 meshes with the driven gear of the rotating body; the force application unit 2 is used to apply a force to the eccentric gear 11 so that the eccentric gear 11 generates an adaptive resistance torque on the rotating body when there is an eccentric moment on the rotating body.

[0077] The above structure of the rotary body balancing device in this embodiment can generate an adaptive resistance moment for the eccentric moment of the rotary body, so that the rotary body can achieve adaptive rotational balance, improve the performance stability and image quality of the non-destructive testing equipment, enhance the scanning accuracy, ensure the quality and service life of the key components of the product, and at the same time greatly reduce the time and resources occupied during the adjustment of the balance of the rotary body, significantly improving the production efficiency.

[0078] A preferred solution of this embodiment is as Figure 1 and Figure 2 shown. The force application unit 2 includes an elastic member 21. The elastic member 21 is arranged in the direction of the line of centers L1 between the eccentric gear 11 and the driven gear. The axis of the eccentric gear 11 can move along the direction of the line of centers L1, so that the elastic member 21 is compressed to apply a force to the eccentric gear 11, realizing the function of the eccentric gear 11 generating an adaptive resistance moment for the rotary body, and achieving the effect of making the rotary body rotate in balance. Preferably, the elastic member 21 is a compression spring.

[0079] A preferred solution of this embodiment is as Figure 1 and Figure 2 shown. The rotary body balancing device further includes a guiding unit 3 and a mounting frame 4. The guiding unit 3 is installed on the mounting frame 4 and is used to guide the movement of the eccentric gear 11 along the direction of the line of centers L1. The mounting frame 4 is used to be fixedly connected with the rotary body.

[0080] A preferred solution of this embodiment is as Figure 2 and Figure 3 shown. The balancing unit 1 includes an eccentric gear 11, a second mounting seat 12 and a bearing 13.

[0081] The eccentric gear 11 meshes with the driven gear on the rotary body, and the tooth number ratio of the driven gear to the eccentric gear 11 needs to be an integer. As Figure 3 shown, the eccentric gear 11 includes a gear core shaft 111, and the eccentric gear 11 is rotationally connected with the second mounting seat 12 through the gear core shaft 111.

[0082] As Figure 2 , Figure 3 and Figure 4 shown, the second mounting seat 12 includes a mounting plate 121, a bushing 122 and an extrusion member 123. Preferably, the mounting plate 121 is a rectangular plate, the bushing 122 is located at the center of the mounting plate 121, the gear core shaft 111 passes through the bushing 122, and the bearing 13 is assembled between the gear core shaft 111 and the bushing 122, so that the eccentric gear 11 can rotate around the gear core shaft 111 on the mounting plate 121.

[0083] Preferably, as Figure 3 and Figure 4As shown, there are two bearings 13, with a spacer sleeve 14 provided in the middle. The end of the gear mandrel 111 is threadedly engaged and locked with two lock nuts 15.

[0084] As Figure 3 and Figure 4 shown, the extrusion part 123 is fixed on the mounting plate 121 and is used to extrude one end of the elastic part 21. Preferably, the extrusion part 123 includes a first positioning block 1231 and an extrusion block 1232. The first positioning block 1231 is a cylindrical block perpendicular to the extrusion block 1232. The first positioning block 1231 is inserted into one end of the elastic part 21 to limit one end of the elastic part 21, so as to ensure that the acting force between the extrusion block 1232 and the elastic part 21 is perpendicular to the surface of the extrusion block 1232.

[0085] In a preferred solution of this embodiment, the force application unit 2 includes an elastic part 21, a first mounting seat 22 and an adjustment part 23.

[0086] As Figure 2 and Figure 4 shown, the first mounting seat 22 is fixedly connected to the mounting frame 4. A threaded hole 221 is provided on the first mounting seat 22. The adjustment part 23 is located in the threaded hole 221. One end of the adjustment part 23 is provided with an external thread matching the threaded hole 221, and the other end is provided with a second positioning block 231. The second positioning block 231 is arranged opposite to the first positioning block 1231. Both ends of the elastic part 21 are respectively sleeved on the outer circumferences of the first positioning block 1231 and the second positioning block 231, so as to ensure the telescopic direction of the elastic part 21. Exemplarily, the adjustment part 23 is a screw rod matching the threaded hole 221.

[0087] In a preferred solution of this embodiment, the guiding unit 3 includes a guide rail 31 and a slider 32; As Figure 2 shown, the guide rail 31 is fixed on the mounting frame 4. One side of the slider 32 is slidably connected to the guide rail 31, and the other side is fixedly connected to the mounting plate 121. Preferably, two sets of guiding units 3 are provided, which are respectively located on both sides of the force application unit 2.

[0088] The mounting frame 4 is used to be fixedly connected to the rotating body. After connection, it is necessary to ensure that the eccentric gear 11 is engaged with the driven gear and the elastic part 21 is arranged on the extension line of the center line L1 between the eccentric gear 11 and the driven gear. When the driven gear rotates and drives the eccentric gear 11 to rotate, the eccentric gear 11 will move periodically along the direction of the center line L1 under the guiding action of the guiding unit 3, so that the pressure of the extrusion part 123 on one end of the elastic part 21 will change periodically. Correspondingly, the radial reaction force of the elastic part 21 on the eccentric gear 11 will also change periodically.

[0089] It should be noted that, as Figure 5As shown, when the rotating body rotates to the position where the eccentric moment generated by its center of mass is the largest, it is necessary to ensure that the remote center end of the eccentric gear 11 meshes with the driven gear, that is, the remote center end of the eccentric gear 11 meshes with the driven gear.

[0090] As Figure 5 and Figure 6 shown, since there is generally a deviation between the actual center of mass G of the rotating body and the theoretical rotation center, there will definitely be an eccentric situation when the rotating body rotates. When the eccentric load moment generated by the center of mass G of the rotating body is greater than the frictional moment generated between the components during the rotation of the rotating body, there will be an eccentric moment T during the rotation of the rotating body, resulting in a situation of rotational imbalance. The rotating body balancing device of this embodiment can decompose part of the radial force between the eccentric gear 11 and the driven gear into tangential resistance by making the eccentric gear 11 mesh with the driven gear after assembly, thereby forming a rotational resistance moment of the driven gear. Since the eccentricity of the eccentric gear 11 is variable, the pressure of the elastic member 21 abutting below the pressing member 123 also changes accordingly. Therefore, during the rotation of the rotating body, not only does the position of the center of mass G of the rotating body change periodically, but the rotational resistance moment exerted by the eccentric gear 11 on the rotating body also changes periodically. Since the tooth ratio of the driven gear to the eccentric gear 11 is an integer, and the assembly conditions of this device satisfy the position where the eccentric load moment generated by the center of mass G of the rotating body is the largest, the remote center end of the eccentric gear 11 meshes with the driven gear, thereby ensuring that every time the rotating body rotates to the position where the eccentric moment generated by the center of mass G of the rotating body is the largest, the rotational resistance moment exerted by the eccentric gear 11 on the driven gear is the maximum value to balance the maximum eccentric moment received by the rotating body.

[0091] Exemplarily, as Figure 5 shown, when the center of mass G of the rotating body rotates downward and the connection line with the rotation center C is horizontal, the eccentricity of the eccentric gear 11 is the largest, the compression amount of the elastic member 21 is the largest, the radial reaction force exerted by the elastic member 21 on the eccentric gear 11 is the largest, and the corresponding tangential component force is also the largest, and the balancing resistance moment generated on the rotating body is also the largest. Therefore, every time the center of mass G of the rotating body approaches Figure 5When in the position in [description], the moment of the centroid is most likely to be greater than the frictional moment within the rotating body, generating an eccentric moment. According to the arrangement of this device, since the tooth number ratio of the driven gear 300 to the eccentric gear 11 is an integer, the rotational resistance exerted by the eccentric gear 11 on the driven gear 300 at this time is at its maximum value, and it increases and decreases synchronously with the increase and decrease of the eccentric moment in the vicinity, thus achieving the beneficial effect of adaptively adjusting the rotational balance of the rotating body, improving the scanning accuracy, and ensuring the quality and service life of the key components of the product. On the other hand, due to the backlash between the driving gear and the driven gear 300 and the rotational inertia of the driven gear 300, the driven gear is prone to overshoot, resulting in out-of-control rotational accuracy. The balancing resistance moment exerted by the eccentric gear 11 in this embodiment on the rotating body can offset the rotational inertia of the driven gear, avoiding overshoot and further realizing the adaptive balance of the rotating body during the 360° rotation process.

[0092] As Figure 6 shown, considering that when the centroid G of the rotating body rotates upward and the connection line with the rotation center C is horizontal, the rotational resistance generated by the centroid G of the rotating body is already at its maximum. At this time, the compression amount of the elastic member 21 needs to be the smallest. Therefore, the eccentric gear 11 should rotate to the position where the eccentricity is zero to generate the smallest balancing resistance moment on the rotating body. Therefore, the tooth number ratio of the driven gear to the eccentric gear 11 needs to be an odd integer.

[0093] Since the magnitudes of the eccentric moments T of different rotating bodies are different and will change during use, in order to make the balancing resistance moment exerted by the eccentric gear 11 on the rotating body relatively balanced with the eccentric moment of the rotating body, as Figure 3 and Figure 4 shown, the adjusting member 23 further includes a baffle 232. The baffle 232 is an annular plate located on the outer periphery of the adjusting member 23 and is between the elastic member 21 and the first mounting seat 22; the baffle 232 abuts against one end of the elastic member 21. When the adjusting member 23 is rotated to move the baffle 232 on the first mounting seat 22, the baffle 232 will squeeze the elastic member 21, thereby increasing the base value of the radial reaction force of the elastic member 21 on the eccentric gear 11 to ensure that the balancing resistance moment exerted by the eccentric gear 11 on the rotating body is relatively balanced with the eccentric moment of the rotating body. By providing the baffle 232 on the adjusting member 23, it is not necessary to replace elastic members 21 with different rigidities, making the rotating body balancing device have better flexibility and adaptability.

[0094] Embodiment 2

[0095] This embodiment discloses a rotating body balancing method, which adopts the rotating body balancing device of Embodiment 1 for balancing the rotating body of a nondestructive testing device.

[0096] As Figure 7 shown, the rotating body balancing method of this embodiment includes the following steps:

[0097] Step S100 detects the position where the centroid of the rotating body is located, and sets a centroid position mark M at the position of the centroid according to the detection result.

[0098] Step S200 assembles the rotating body balancing device according to the position of the centroid position mark M.

[0099] Step S300 starts the non-destructive testing equipment to rotate the rotating body.

[0100] Step S400 enables the rotating body balancing device to achieve adaptive balance during the rotation of the rotating body.

[0101] In the non-destructive testing rotating body balancing method of this embodiment, by installing the rotating body balancing device, the rotating body achieves adaptive balance during rotation, improves the performance stability of the non-destructive testing equipment, and at the same time greatly reduces the time and resources occupied when adjusting the balance of the rotating body, significantly improving the production efficiency.

[0102] Among them, step S100 includes the following sub-steps:

[0103] S110 takes the rotation center C of the driven gear 300 of the rotating body as the center of the circle, sets a zero angle mark M0 on the driven gear 300, and takes the initial position of the zero angle mark MO as the zero angle position of the rotating body.

[0104] S120 starts the motor 100 to rotate the rotating body and monitors the current value of the motor 100.

[0105] S130 plots the current-angle curve of the motor 100 and determines the centroid angle A where the centroid of the rotating body is located.

[0106] S140 sets the centroid position mark M at the centroid angle A on the driven gear 300 according to the zero angle mark M0.

[0107] The method for determining the centroid angle A where the centroid of the rotating body is located in sub-step S130 is as follows:

[0108] As Figure 5 and Figure 6 shown, since there is generally a deviation between the actual centroid G of the rotating body and the theoretical rotation center C, the rotating body will definitely be eccentric when rotating. When the eccentric moment generated by the centroid G of the rotating body is greater than the frictional moment generated between the components during the rotation of the rotating body, an unbalanced situation will occur during the rotation of the rotating body. Since the rotation of the rotating body is driven by the operation of the motor 100 to drive the driving gear 200 to rotate, and then the driving gear 200 drives the driven gear 300 to rotate. For the motor 100, the rotating body is the load. If the centroid G of the rotating body coincides with the rotation center C, the current value of the motor 100 is constant at this time; if the centroid of the rotating body deviates, as Figure 8As shown, during the rotation process, the current of the motor 100 will generate different current magnitudes when the center of mass rotates to different angular directions. Since the balancing method of the rotating body in this embodiment is used for a rotating body device driven by gears, the rotation center C of the rotating body is the center of the driven gear 300.

[0109] Taking the clockwise rotation of the rotating body as an example, if the line connecting the center of mass G of the rotating body and the rotation center C is in the horizontal position and rotating upward, the current of the motor 100 is the largest. If the line connecting the center of mass G of the rotating body and the rotation center C is in the horizontal position and rotating downward, the current of the motor 100 is the smallest. Therefore, after completing sub-step S120, in sub-step S130, the current-angle curve (partial curve) as shown in Figure 8 is obtained. The angle corresponding to the minimum current in the current-angle curve graph is the center of mass angle A where the center of mass G of the rotating body is located. Finally, according to the zero-angle mark M0 marked in sub-step S110, a center of mass position mark M is set at the position of the center of mass angle A of the driven gear 300. Exemplarily, the center of mass position mark M is close to the tooth corresponding to the center of mass angle A.

[0110] Among them, the assembly process of step S200 includes the following sub-steps:

[0111] S210 Rotate the rotating body to make the rotating body stop at a position where the center of mass position mark M rotates downward and the line connecting it and the rotation center C is horizontal;

[0112] As shown in Figure 6 , taking the clockwise rotation of the rotating body as an example, when the center of mass position mark M rotates downward and the line connecting it and the rotation center C is horizontal, it is the position where the eccentric moment of the center of mass G of the rotating body is the largest.

[0113] S220 Assemble the rotating body balancing device directly below the rotating body, so that the remote center end of the eccentric gear 11 meshes with the driven gear 300.

[0114] Since the tooth number ratio of the driven gear 300 and the eccentric gear 11 is an integer, the assembly method of step S200 can ensure that every time the rotating body rotates to the position where the eccentric moment generated by the center of mass G of the rotating body is the largest, the remote center end of the eccentric gear 11 can mesh with the driven gear 300. In this step, the rotating body can also be stopped at a position where the center of mass position mark M is directly below, and the corresponding tooth of the eccentric gear 11 is meshed and assembled with the driven gear 300 through the calculation of the tooth number ratio, but it is necessary to ensure that when the rotating body rotates to the position where the eccentric moment generated by the center of mass G of the rotating body is the largest, the remote center end of the eccentric gear 11 meshes with the driven gear 300.

[0115] Among them, step S300 includes the following sub-steps:

[0116] S310 starts the motor 100, and the driving gear 200 drives the driven gear 300 to rotate, thereby rotating the rotating body;

[0117] S320 The driven gear 300 drives the eccentric gear 11 to rotate, and the rotation speed ratio of the driven gear 300 to the eccentric gear 11 is an odd number.

[0118] As Figure 6 shown, in this step, since the rotation speed ratio of the driven gear 300 to the eccentric gear 11 is an odd number, it can be ensured that when the centroid position mark M rotates upward and the line connecting it to the rotation center C is horizontal, the eccentricity of the eccentric gear 11 is zero.

[0119] Among them, as Figure 9 shown, the adaptive balance of the rotating body in step S400 includes the following process:

[0120] S410 During the rotation of the eccentric gear 11, it moves up and down reciprocally, and the elastic member 21 is repeatedly compressed and extended;

[0121] S420 The elastic member 21 exerts an upward radial reaction force F1 on the eccentric gear 11 according to the compression amount;

[0122] S430 The eccentric gear 11 transmits the radial reaction force F1 to the driven gear 300 through meshing, and part of the radial reaction force F1 is decomposed into a tangential rotational resistance F2 on the driven gear 300, so that the driven gear 300 is subjected to a rotational resistance moment;

[0123] S440 When the centroid position mark M of the rotating body rotates downward and the line connecting it to the rotation center C is horizontal, the far center end of the eccentric gear 11 and the driven gear 300 are meshed with the eccentric gear 11, and the compression amount of the elastic member 21 is the largest, so that the driven gear 300 is subjected to the maximum rotational resistance moment to balance the maximum eccentric moment received by the rotating body.

[0124] In the rotating body balance method of this embodiment, by adopting the assembly method of step S220, it is ensured that when the rotating body rotates to the position where the centroid eccentric moment is the largest, the compression amount of the elastic member 21 by the eccentric gear 11 is the largest, so that the reaction force of the elastic member 21 acting on the eccentric gear 11 is the largest, and correspondingly, the tangential rotational resistance F2 of the eccentric gear 11 acting on the driven gear 300 is also the largest, so that the rotational resistance moment received by the rotating body is also the largest when the eccentric moment T is the largest, ensuring the rotational balance of the rotating body. Since the rotation speed ratio of the driven gear 300 to the eccentric gear 11 is an integer, in this step, each time the rotating body rotates to the position where the eccentric moment T is the largest, the tangential rotational resistance F2 of the eccentric gear 11 acting on the driven gear 300 is the maximum value.

[0125] Further, in step S440, when the eccentric moment T of the rotating body increases or decreases, the rotational resistance moment received by the driven gear 300 also increases or decreases, so that the rotating body achieves adaptive balance.

[0126] Since when the centroid position mark M of the rotating body rotates downward and the connection line with the rotation center C approaches the horizontal, the change of the eccentric moment of the rotating body is a gradual increase and decrease process, and the compression amount of the elastic member 21 by the eccentric gear 11 also gradually increases and decreases, so that the tangential rotational resistance F2 exerted by the eccentric gear 11 on the driven gear 300 also increases and decreases accordingly, enabling the rotating body to achieve adaptive balance during the rotation process.

[0127] The rotating body balance method of this embodiment further includes: step S500 to detect the current value of the motor 100, and when the amplitude of the current value is greater than a preset threshold, adjust the adjusting member 23 to increase the pre-compression amount of the elastic member 21.

[0128] Since the magnitudes of the eccentric moments T of different rotating bodies are different and will change during use, in order to make the balance resistance moment exerted by the eccentric gear 11 on the rotating body balance with the eccentric moment of the rotating body, the rotating body balance method of this embodiment can, through step S500, change the basic elastic force of the elastic member 21 by adjusting the adjusting member 23, without the need to frequently replace elastic members 21 with different rigidities, making the rotating body balance device have better flexibility and adaptability. The rotating body balance method of this embodiment, by assembling the rotating body balance device of Embodiment 1 on the rotating body, achieves the beneficial effect of adaptively adjusting the rotational balance of the rotating body, improves the scanning accuracy, and ensures the quality and service life of the key components of the product.

[0129] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A rotating body balancing device, characterized in that: comprising a balancing unit (1); The balancing unit (1) can apply a counter torque to the rotating body that is balanced with the deflection torque generated by the center of mass of the rotating body.

2. The rotating body balancing device according to claim 1, characterized in that: It also comprises a force applying unit (2), wherein the force applying unit (2) is used to apply a thrust in the direction of the rotating body to the balancing unit (1).

3. The rotating body balancing device according to claim 2, characterized in that: It also comprises a mounting frame (4), wherein the mounting frame (4) is used for being fixedly connected to the rotating body.

4. The rotating body balancing device according to claim 3, characterized in that: The force applying unit (2) comprises a first mounting seat (22), and the first mounting seat (22) is fixedly connected to the mounting frame (4).

5. The rotating body balancing device according to claim 4, characterized in that: The force applying unit (2) further comprises an elastic component (21); the elastic component (21) is used to apply a thrust to the balancing unit (1).

6. The rotating body balancing device according to claim 5, characterized in that: The force applying unit (2) further comprises an adjusting component (23), and the other end of the elastic component (21) abuts against one end of the adjusting component (23).

7. The rotating body balancing device according to claim 6, characterized in that: The first mounting seat (22) is provided with a screw hole (221); the other end of the adjustment component (23) is threadedly connected to the screw hole (221).

8. A non-destructive testing method for the balance of a rotating body, characterized in that: The rotary body balancing device according to any one of claims 1 to 7 comprises the following steps: Step S100 detects the position of the center of mass of the rotating body, and sets a center of mass position mark M at the center of mass position according to the detection result; Step S200: assemble the rotating body balancing device according to the position of the center of mass position mark M; Step S300: starting the nondestructive testing equipment to rotate the rotating body; Step S400: The rotating body balancing device enables the rotating body to achieve adaptive balance during the rotation process.

9. The non-destructive testing method for rotating body balance according to claim 8, characterized in that: The step S100 determines the position of the center of mass of the rotating body by monitoring the current value of the motor.

10. The non-destructive testing method for rotating body balance according to claim 9, characterized in that: The step S100 includes the following sub-steps: S110, taking the rotation center C of the driven gear (300) of the rotating body as the center of the circle, setting a zero angle mark M0 on the driven gear (300), and taking the initial position of the zero angle mark MO as the zero angle position of the rotating body; S120 starts the motor (100) to rotate the rotating body and monitors the current value of the motor (100); S130 draws a current-angle curve of the motor (100) to determine the mass center angle A where the mass center of the rotating body is located; S140 sets a mass center position mark M at a mass center angle A on the driven gear (300) according to a zero angle mark M0.

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