A method for post-correction dynamic balancing of magnetic levitation machine head

Abstract

The present invention relates to the field of magnetic levitation machine head correction, and in particular to a method for post-correction dynamic balancing of a magnetic levitation machine head. The method uses a balancing tool to correct the magnetic levitation machine head. The magnetic levitation machine head includes a motor, a three-dimensional flow impeller, and a heat dissipation impeller. The interior of the motor is provided with an axially penetrating main shaft, and radial induction probes are provided at the middle of both ends of the main shaft. The three-dimensional flow impeller and the heat dissipation impeller are respectively connected to the two ends of the main shaft and abut against the motor; wherein, a plurality of first threaded holes are provided on the end with a smaller surface area of ​​the three-dimensional flow impeller, and a plurality of second threaded holes are provided on the end with a smaller surface area of ​​the heat dissipation impeller. By grinding the studs on the three-dimensional flow impeller and the heat dissipation impeller, the radial fluctuation value of the entire magnetic levitation machine head is in a normal state, ensuring that there will be no deviation fluctuation in the dynamic balance value of the three-dimensional flow impeller when it is assembled to the machine head.

Description

Technical Field

[0001] The invention relates to the field of magnetic levitation machine head correction, and in particular to a post-correction dynamic balancing method for a magnetic levitation machine head. Background Art

[0002] For various rotating bodies, the centrifugal inertial forces generated by each tiny particle on the rotating body cannot offset each other during rotation due to various factors such as material unevenness or rough defects, errors in the machining and assembly processes, and even geometric asymmetry in the design. Centrifugal inertial forces act on the machine and its foundation through the bearings, causing vibration and noise, shortening the machine's life, and in severe cases, even causing destructive accidents. Therefore, it is necessary to balance the rotor to achieve an acceptable level of balancing accuracy or reduce the resulting mechanical vibration amplitude to within an acceptable range.

[0003] When replacing the three-dimensional flow impeller of air suspension blowers, magnetic suspension blowers and compressors, different impeller models can be replaced to change the exhaust pressure and flow of the model. Under normal circumstances, the three-dimensional flow impeller is dynamically balanced and corrected together with the main shaft assembly. However, since one handpiece can be equipped with multiple models of three-dimensional flow impellers, and a single three-dimensional flow impeller needs to be assembled to the handpiece after dynamic balancing correction, there will still be deviations and fluctuations in the dynamic balance amount. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a method for post-correction dynamic balancing of a magnetic levitation machine head. By using this method, the three-dimensional flow impeller will not have deviation fluctuations in the dynamic balance when it is assembled to the machine head.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] A method for post-correction dynamic balancing of a magnetic levitation handpiece is disclosed. The method uses a balancing tool to correct the magnetic levitation handpiece. The magnetic levitation handpiece includes a motor, a three-dimensional flow impeller, and a heat dissipation impeller. The motor is provided with an axially extending main shaft, and radial induction probes are provided at the middle of both ends of the main shaft. The three-dimensional flow impeller and the heat dissipation impeller are respectively connected to both ends of the main shaft and abut against the motor. The end of the three-dimensional flow impeller with a smaller surface area is provided with a plurality of first threaded holes, and the end of the heat dissipation impeller with a smaller surface area is provided with a plurality of second threaded holes.

[0007] The method comprises the following steps:

[0008] S1. Install a first stud in the first threaded hole of the three-dimensional flow impeller, install a second stud in the second threaded hole of the heat dissipation impeller, and install a controller and a dynamic balancing device outside the magnetic levitation head;

[0009] S2. Place the balancing fixture on the dynamic balancing equipment, and bolt the three-dimensional flow impeller and the heat dissipation impeller to the two ends of the balancing fixture, and perform dynamic balancing correction on the three-dimensional flow impeller using the dynamic balancing equipment;

[0010] S3. Remove the three-dimensional flow impeller and the heat dissipation impeller from the balancing tool and install them on both ends of the motor main shaft. The three-dimensional flow impeller and the heat dissipation impeller are fixedly connected to the main shaft by bolts;

[0011] S4, driving the motor of the magnetic levitation head to operate at a low speed, and monitoring the signal emitted by the radial induction probe through the controller;

[0012] S5. The data detected by the controller shows the radial fluctuation value of the main shaft of the magnetic levitation head when running at low speed. When the radial fluctuation value is ≤5%, it is normal; when the radial fluctuation value is greater than 5%, it is abnormal. In this case, the weight of the first stud installed on the three-dimensional flow impeller needs to be adjusted;

[0013] S6. Remove the first stud on a three-dimensional flow impeller, use a tool to slightly grind the first stud, and then install it back to its original position.

[0014] Preferably, the method further comprises:

[0015] S7, re-driving the motor of the magnetic levitation handpiece to make it run at a low speed again, and monitoring the signal emitted by the radial induction probe through the controller;

[0016] S8. Observe whether the radial fluctuation value detected by the controller after correction is within the normal range;

[0017] S9. When the radial fluctuation value decreases and is still not in a normal state, the step S6 needs to be repeated; when the radial fluctuation value increases gradually or sharply, the second stud in the second threaded hole needs to be removed, and the second stud needs to be slightly ground with a tool, and then installed back to its original position after grinding;

[0018] S10, re-driving the motor of the magnetic levitation handpiece to make it run at a low speed again, and monitoring the signal emitted by the radial induction probe through the controller;

[0019] S11. When the radial fluctuation value is in a normal state, the operation is terminated; when the radial fluctuation value is in an abnormal state, the operations of S9 and S10 are repeated until the radial fluctuation value is in a normal state.

[0020] Preferably, in step S1 , the depth of the first threaded hole is greater than or equal to the length of the first stud, and the depth of the second threaded hole is greater than or equal to the length of the second stud.

[0021] Preferably, in step S2, when fixing the three-dimensional flow impeller and the heat dissipation impeller, the end of the three-dimensional flow impeller with a larger surface area abuts one end of the balancing tooling, and the end of the heat dissipation impeller with a larger surface area abuts the other end of the balancing tooling.

[0022] Preferably, the balancing tool is a spare shaft body, and the structure of the spare shaft body is the same as that of the main shaft.

[0023] Preferably, the spare shaft is provided with dynamic balancing points, and two dynamic balancing points are symmetrically arranged; in step S2, the dynamic balancing device fixes the spare shaft by abutting against the dynamic balancing points of the spare shaft.

[0024] Preferably, the two dynamic balancing points are located in the middle of both ends of the spare shaft body, and are at the same position as the radial induction probe is set on the main shaft.

[0025] Preferably, a first through hole extending axially through the three-dimensional flow impeller is provided, a tie rod shaft is inserted into the first through hole, and both ends of the tie rod shaft protrude from the first through hole, a first nut is provided on one end of the tie rod shaft, and the first nut abuts against the end of the three-dimensional flow impeller with a smaller surface area.

[0026] In summary, the advantages of the present invention are as follows:

[0027] After the three-dimensional flow impeller is dynamically balanced on the balancing fixture, it needs to be installed on the magnetic levitation handpiece. During installation, new deviation fluctuations will occur. By grinding the studs on the three-dimensional flow impeller and the heat dissipation impeller, the radial fluctuation value of the entire magnetic levitation handpiece is normalized, ensuring that there will be no deviation fluctuations in the dynamic balance of the three-dimensional flow impeller when it is assembled to the handpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the balancing tooling, the three-dimensional flow impeller and the heat dissipation impeller;

[0029] Figure 2 Schematic diagram of the structure of the magnetic levitation head;

[0030] Figure 3 It is a structural diagram of the three-dimensional flow impeller;

[0031] Figure 4 Schematic diagram of the structure of the heat dissipation impeller;

[0032] Figure numerals: 1. Magnetic levitation head; 2. Motor; 3. Three-dimensional flow impeller; 4. Heat dissipation impeller; 5. Balancing tooling; 21. Main shaft; 22. Radial induction probe; 31. First threaded hole; 32. First stud; 33. First through hole; 34. Pull rod shaft; 35. First nut; 41. Second threaded hole; 42. Second stud; 51. Spare shaft; 52. Dynamic balancing point. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0035] It should also be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0036] The following is a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings.

[0037] like Figures 1 to 4 Figure 1 shows a post-correction dynamic balancing method for a magnetic levitation handpiece. This method uses a balancing fixture 5 to calibrate a magnetic levitation handpiece 1. The magnetic levitation handpiece 1 includes a motor 2, a three-dimensional flow impeller 3, and a heat dissipation impeller 4. A main shaft 21 extends axially through the motor 2, and radial induction probes 22 are located midway between the ends of the main shaft 21. The three-dimensional flow impeller 3 and the heat dissipation impeller 4 are respectively connected to the ends of the main shaft 21 and abut against the motor 2.

[0038] The smaller end of the three-dimensional impeller 3 has several first threaded holes 31, within which first studs 32 are located. The smaller end of the heat dissipation impeller 4 has several second threaded holes 41, within which second studs 42 are located. The depth of the first threaded holes 31 is greater than or equal to the length of the first studs 32, while the depth of the second threaded holes 41 is greater than or equal to the length of the second studs 42. This arrangement prevents the first studs 32 from protruding from the first threaded holes 31, and the second studs 42 from protruding from the second threaded holes 41, ensuring that the studs are not exposed and are securely fastened.

[0039] like Figures 1 to 2As shown, the balancing fixture 5 is a spare shaft 51, and the structure of the spare shaft 51 is the same as that of the main shaft 21. Before installing the three-dimensional flow impeller 3 and the heat dissipation impeller 4 on the magnetic levitation head 1, a first adjustment of the dynamic balance is required; this first adjustment requires installing the three-dimensional flow impeller 3 and the heat dissipation impeller 4 on the left and right ends of the spare shaft 51.

[0040] Among them, the three-dimensional flow impeller 3 is provided with a first through hole 33 that passes axially through it, a tie rod shaft 34 is inserted into the first through hole 33, and both ends of the tie rod shaft 34 protrude from the first through hole 33, and a first nut 35 is provided on the left end of the tie rod shaft 34, and the first nut 35 abuts against the end (left end) with a smaller surface area of ​​the three-dimensional flow impeller 3.

[0041] To adjust the dynamic balance of the three-dimensional flow impeller 3 and the heat dissipation impeller 4, first bolt the three-dimensional flow impeller 3 and the heat dissipation impeller 4 to the ends of the balancing fixture 5. Then, place the installed balancing fixture 5 on the dynamic balancing equipment, and use the dynamic balancing equipment to perform dynamic balance correction on the three-dimensional flow impeller 3. This correction requires deduplication of the first stud 32 of the three-dimensional flow impeller 3 and pneumatic grinding to ensure that the dynamic balance value is within a small range.

[0042] like Figure 1 As shown, a dynamic balancing point 52 is provided on the spare shaft body 51, and there are two dynamic balancing points 52 symmetrically located near the middle of both ends of the spare shaft body 51. The dynamic balancing device fixes the spare shaft body 51 by abutting against the dynamic balancing points 52 of the spare shaft body 51.

[0043] When fixing the three-dimensional flow impeller 3 and the heat dissipation impeller 4 , the end of the three-dimensional flow impeller 3 with a larger surface area abuts one end of the balancing tool 5 , and the end of the heat dissipation impeller 4 with a larger surface area abuts the other end of the balancing tool 5 .

[0044] like Figures 1 to 2 As shown, after the first dynamic balancing adjustment of the three-dimensional flow impeller 3, the three-dimensional flow impeller 3 and the heat dissipation impeller 4 need to be removed from the balancing tool 5 and installed on both ends of the main shaft 21 of the motor 2, wherein the three-dimensional flow impeller 3 and the heat dissipation impeller 4 are fixedly connected to the main shaft 21 by bolts.

[0045] At this point, the motor 2 of the magnetic levitation handpiece 1 is driven to a low speed, and the controller monitors the signal from the radial sensing probe 22. The data detected by the controller indicates the radial fluctuation value of the main shaft 21 of the magnetic levitation handpiece 1 during low-speed operation. A radial fluctuation value of ≤5% is normal; a radial fluctuation value greater than 5% is abnormal, indicating that the weight of the first stud 32 mounted on the three-dimensional flow impeller 3 needs to be adjusted. This is the second adjustment.

[0046] The second adjustment involves removing the first stud 32 from one of the three-dimensional impellers 3, slightly grinding it with a tool, and then reinstalling it. After the adjustment, the motor 2 of the magnetic levitation head 1 is reactivated to a low speed. The controller monitors the signal from the radial sensing probe 22 and observes the radial fluctuation value detected by the controller after correction to determine whether it is within the normal range.

[0047] When the radial fluctuation value is still not in a normal state, a third adjustment is required, and when it is in a normal state, the operation is stopped.

[0048] The third adjustment is divided into two situations, namely, the radial fluctuation value decreases and the radial fluctuation value increases or increases sharply.

[0049] 1. When the radial fluctuation value decreases, repeat the second adjustment operation.

[0050] 2. When the radial fluctuation value increases or increases sharply, it is necessary to remove the second stud 42 in the second threaded hole 41, and use a tool to grind the second stud 42 a little, and install it back to its original position after grinding; and re-drive the motor 2 of the magnetic levitation head 1 to make it run at a low speed again, and monitor the signal emitted by the radial sensing probe 22 through the controller.

[0051] By observing the radial fluctuation value of the third adjustment, it is determined whether the entire magnetic levitation head 1 still has deviation in the dynamic balance. If it is in a normal state, the operation is terminated; if it still exists, the third adjustment operation is repeated until the radial fluctuation value is in a normal state.

[0052] like Figures 1 to 2 As shown, the spare shaft 51 is the unused main shaft 21. In order to detect whether the magnetic levitation head 1 has a deviation in the dynamic balance, the radial sensing probe 22 needs to be set at the dynamic balance point 52. That is, the radial sensing probe 22 is set at the same position as the dynamic balance point 52. This arrangement makes the detected dynamic balance more accurate.

[0053] Normal dynamic balancing requires removing the three-dimensional flow impeller 3 and adjusting it again; however, deviations will still occur after reinstallation. However, through the above steps, the three-dimensional flow impeller 3 and the heat dissipation impeller 4 can be adjusted dynamically after installation in the magnetic levitation handpiece 1 without removal, thus preventing deviations and ensuring the accuracy and service life of the magnetic levitation handpiece 1.

[0054] The method is as follows:

[0055] S1. Install a first stud 32 in the first threaded hole 31 of the ternary flow impeller 3, install a second stud 42 in the second threaded hole 41 of the heat dissipation impeller 4, and install a controller and a dynamic balancing device on the outside of the magnetic levitation head 1; wherein the depth of the first threaded hole 31 is greater than or equal to the length of the first stud 32, and the depth of the second threaded hole 41 is greater than or equal to the length of the second stud 42;

[0056] S2. The dynamic balancing device fixes the spare shaft 51 by abutting against the dynamic balancing point 52 of the spare shaft 51, and abuts the end of the three-dimensional flow impeller 3 with a larger surface area against the left end of the balancing fixture 5, and abuts the end of the heat dissipation impeller 4 with a larger surface area against the right end of the balancing fixture 5, and performs dynamic balancing correction on the three-dimensional flow impeller 3 by the dynamic balancing device;

[0057] S3, remove the three-dimensional flow impeller 3 and the heat dissipation impeller 4 from the spare shaft 51 and install them on both ends of the main shaft 21 of the motor 2, and the three-dimensional flow impeller 3 and the heat dissipation impeller 4 are fixedly connected to the main shaft 21 by bolts;

[0058] S4, driving the motor 2 of the magnetic levitation head 1 to run at a low speed, and monitoring the signal emitted by the radial induction probe 22 through the controller;

[0059] S5. The controller detects data showing the radial fluctuation value of the main shaft 21 of the magnetic levitation machine head 1 during low-speed operation. A radial fluctuation value of ≤5% is considered normal. A radial fluctuation value of >5% is considered abnormal, and the weight of the first stud 32 installed on the ternary flow impeller 3 needs to be adjusted.

[0060] S6. Remove the first stud 32 from a three-dimensional flow impeller 3, slightly grind the first stud 32 with a tool, and then install it back to its original position.

[0061] S7, re-driving the motor 2 of the magnetic levitation handpiece 1 to make it run at a low speed again, and monitoring the signal emitted by the radial induction probe 22 through the controller;

[0062] S8. Observe whether the radial fluctuation value detected by the controller after correction is within the normal range;

[0063] S9. When the radial fluctuation value decreases and is still not in a normal state, the step S6 needs to be repeated. When the radial fluctuation value increases gradually or sharply, the second stud 42 in the second threaded hole 41 needs to be removed and slightly ground with a tool, and then installed back to its original position after grinding.

[0064] S10, re-driving the motor 2 of the magnetic levitation handpiece 1 to make it run at a low speed again, and monitoring the signal emitted by the radial induction probe 22 through the controller;

[0065] S11. When the radial fluctuation value is in a normal state, the operation is terminated; when the radial fluctuation value is in an abnormal state, the operations of S9 and S10 are repeated until the radial fluctuation value is in a normal state.

[0066] The above is a description of the embodiments of the present invention. The above description of the disclosed embodiments will enable professionals in the field to implement or use the present invention. Various modifications to these embodiments will be apparent to professionals in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for post-correction dynamic balancing of a magnetic levitation machine head, characterized in that: The method uses a balancing tool (5) to calibrate a magnetic levitation machine head (1). The magnetic levitation machine head (1) comprises a motor (2), a three-dimensional flow impeller (3) and a heat dissipation impeller (4). An axially penetrating main shaft (21) is provided inside the motor (2), and radial induction probes (22) are provided at the middle of both ends of the main shaft (21). The three-dimensional flow impeller (3) and the heat dissipation impeller (4) are respectively connected to both ends of the main shaft (21) and abut against the motor (2). A plurality of first threaded holes (31) are provided on an end of the three-dimensional flow impeller (3) with a smaller surface area, and a plurality of second threaded holes (41) are provided on an end of the heat dissipation impeller (4) with a smaller surface area. The method comprises the following steps: S1. A first stud (32) is provided in a first threaded hole (31) of a three-dimensional flow impeller (3), a second stud (42) is provided in a second threaded hole (41) of a heat dissipation impeller (4), and a controller and a dynamic balancing device are provided outside the magnetic levitation head (1); S2. placing the balancing tool (5) on the dynamic balancing device, and bolting the three-dimensional flow impeller (3) and the heat dissipation impeller (4) to the two ends of the balancing tool (5), and performing dynamic balancing correction on the three-dimensional flow impeller (3) by the dynamic balancing device; S3, removing the three-dimensional flow impeller (3) and the heat dissipation impeller (4) from the balancing tool (5) and installing them on both ends of the main shaft (21) of the motor (2), wherein the three-dimensional flow impeller (3) and the heat dissipation impeller (4) are fixedly connected to the main shaft (21) by bolts; S4, driving the motor (2) of the magnetic levitation head (1) to operate at a low speed, and monitoring the signal emitted by the radial induction probe (22) through the controller; S5. Data detected by the controller shows the radial fluctuation value of the main shaft (21) of the magnetic levitation machine head (1) when running at a low speed. When the radial fluctuation value is ≤5%, it is a normal state; when the radial fluctuation value is greater than 5%, it is an abnormal state, and in this case, the weight of the first stud (32) installed on the three-dimensional flow impeller (3) needs to be adjusted; S6. Remove the first stud (32) on a three-dimensional flow impeller (3), use a tool to slightly grind the first stud (32), and then install it back to its original position.

2. The method for post-correction dynamic balancing of a magnetic levitation handpiece according to claim 1, characterized in that: The method further includes: S7, re-driving the motor (2) of the magnetic levitation head (1) to make it run at a low speed again, and monitoring the signal emitted by the radial induction probe (22) through the controller; S8. Observe whether the radial fluctuation value detected by the controller after correction is within the normal range; S9. When the radial fluctuation value decreases and is still not in a normal state, the step S6 needs to be repeated; when the radial fluctuation value increases or increases sharply, the second stud (42) in the second threaded hole (41) needs to be removed, and the second stud (42) needs to be slightly ground with a tool, and then installed back to its original position after grinding; S10, re-driving the motor (2) of the magnetic levitation head (1) to make it run at a low speed again, and monitoring the signal emitted by the radial induction probe (22) through the controller; S11. When the radial fluctuation value is in a normal state, the operation is terminated; when the radial fluctuation value is in an abnormal state, the operations of S9 and S10 are repeated until the radial fluctuation value is in a normal state.

3. The method for post-correction dynamic balancing of a magnetic levitation handpiece according to claim 1, characterized in that: In step S1, the depth of the first threaded hole (31) is greater than or equal to the length of the first stud (32), and the depth of the second threaded hole (41) is greater than or equal to the length of the second stud (42).

4. The method for post-correction dynamic balancing of a magnetic levitation handpiece according to claim 1, characterized in that: In step S2, when the three-dimensional flow impeller (3) and the heat dissipation impeller (4) are fixed, the end of the three-dimensional flow impeller (3) with a larger surface area abuts against one end of the balancing tool (5), and the end of the heat dissipation impeller (4) with a larger surface area abuts against the other end of the balancing tool (5).

5. The method for post-correction dynamic balancing of a magnetic levitation handpiece according to claim 4, characterized in that: The balancing tool (5) is a spare shaft body (51), and the structure of the spare shaft body (51) is the same as that of the main shaft (21).

6. The method for post-correction dynamic balancing of a magnetic levitation handpiece according to claim 5, characterized in that: The spare shaft (51) is provided with dynamic balancing points (52), and the dynamic balancing points (52) are symmetrically arranged at two locations; in step S2, the dynamic balancing device fixes the spare shaft (51) by abutting against the dynamic balancing points (52) of the spare shaft (51).

7. The method for post-correction dynamic balancing of a magnetic levitation handpiece according to claim 6, characterized in that: The two dynamic balance points (52) are located in the middle of both ends of the spare shaft body (51) and are at the same position as the radial induction probe (22) of the main shaft (21).

8. The method for post-correction dynamic balancing of a magnetic levitation handpiece according to claim 1, characterized in that: A first through hole (33) is provided on the three-dimensional flow impeller (3) which passes axially therethrough, a tie rod shaft (34) is inserted into the first through hole (33), and both ends of the tie rod shaft (34) protrude from the first through hole (33), a first nut (35) is provided on one end of the tie rod shaft (34), and the first nut (35) abuts against the end of the three-dimensional flow impeller (3) with a smaller surface area.

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