阅读说明：本技术 一种旋转机械动平衡配重在线测试装置及方法 (Online testing device and method for dynamic balance weight of rotary machine ) 是由 司翔宇 陈悦 庞靖 袁昊 邢海波 李敬豪 于 2021-06-30 设计创作，主要内容包括：本发明提供了一种旋转机械动平衡配重在线测试装置,包括壳体,转子安装在壳体内,并能够相对壳体转动,所述壳体表面连接有振动监测单元,壳体上沿转子周向均匀固定有至少三个电磁铁,所述电磁铁分别与电流控制器电连接,所述转子表面具有标记点,转子外侧还固定有朝向标记点的识别单元,所述识别单元通信连接有转速监测单元。本发明还提供了动平衡配重在线测试方法。本发明的优点在于：通过控制多个电磁铁上的电流大小,为转子提供不同强度和方向的吸引力,从而模拟配重的效果,实现在转动过程中向转子施加配重的目的,从而实现机械动平衡配重的在线测试,调整方便,能够一次测试确定配重位置和大小,提高效率。(The invention provides an online testing device for a dynamic balance weight of a rotary machine, which comprises a shell, wherein a rotor is arranged in the shell and can rotate relative to the shell, the surface of the shell is connected with a vibration monitoring unit, at least three electromagnets are uniformly fixed on the shell along the circumferential direction of the rotor, the electromagnets are respectively and electrically connected with a current controller, the surface of the rotor is provided with a mark point, the outer side of the rotor is also fixed with an identification unit facing the mark point, and the identification unit is in communication connection with a rotating speed monitoring unit. The invention also provides an online test method for the dynamic balance weight. The invention has the advantages that: through controlling the current size on a plurality of electromagnets, for the appeal that the rotor provided different intensity and direction to the effect of simulation counter weight realizes applying the purpose of counter weight to the rotor at the rotation in-process, thereby realizes the on-line test of mechanical dynamic balance counter weight, and the adjustment is convenient, can once test confirm counter weight position and size, raises the efficiency.)

1. The utility model provides a rotating machinery dynamic balance counter weight on-line measuring device which characterized in that: including the casing, the rotor is installed in the casing to casing rotation relatively, casing surface is connected with vibration monitoring unit, evenly is fixed with at least three electro-magnet along rotor circumference on the casing, the electro-magnet is connected with the current controller electricity respectively, the rotor surface has the mark point, and the rotor outside still is fixed with the recognition cell towards the mark point, recognition cell communication connection has rotational speed monitoring unit.

2. The rotary machine dynamic balance weight on-line test device of claim 1, wherein: the vibration monitoring unit, the current controller and the rotating speed monitoring unit are respectively in communication connection with the controller, and the controller can display parameters in the rotating process of the rotor and send control signals.

3. The rotary machine dynamic balance weight on-line test device of claim 1, wherein: the mark points are light reflecting strips attached to the rotor, the identification unit is a laser sensor, and the rotating speed monitoring unit determines the rotating speed of the rotor according to the time difference of identifying the mark points twice.

4. The rotating machine dynamic balance weight on-line test method of the rotating machine dynamic balance weight on-line test device according to any one of claims 1 to 3, characterized in that: comprises that

Step A: enabling the rotor to rotate freely, and recording the vibration condition and the rotating speed of the rotor based on the vibration monitoring unit and the identification unit;

and B: determining the position and the size of a counterweight on the rotor based on the vibration conditions of the rotor at different moments and the positions of the mark points at corresponding moments;

and C: the current controller is used for respectively controlling the current of each electromagnet, and the balance weight is applied to the rotor through electromagnetic force;

step D: repeating steps A-C until the rotor vibration is within the standard range, and recording the position and size of the counterweight.

5. The on-line testing method for the dynamic balance weight of the rotary machine according to claim 4, wherein the method comprises the following steps: in step A, the rotating speed of the rotor in one circle is determined based on the time difference between two adjacent observed marking points of the identification unit.

6. The on-line testing method for the dynamic balance weight of the rotary machine according to claim 4, wherein the method comprises the following steps: in step C, after the position and size of the loading counterweight are determined, the relative position of the electromagnet and the counterweight is determined based on the relative position of the electromagnet and the mark point and the relative position of the counterweight and the mark point, and two electromagnets adjacent to each other before and after the counterweight position are searched, so that the electromagnetic forces provided by the two electromagnets are respectively:

wherein, F₁The electromagnetic force of the first electromagnet on the rotor, F₂The electromagnetic force of the second electromagnet on the rotor is alpha, theta and F, the central angle between the first electromagnet and the counterweight direction is relative to the rotor rotating shaft, and the centrifugal force exerted by the counterweight on the rotor is applied to the rotor.

7. The on-line testing method for the dynamic balance weight of the rotary machine according to claim 6, wherein the method comprises the following steps: the rotor is controlled to rotate at a constant speed or a fixed function changing rotating speed, the change rule of the electromagnetic force provided by each electromagnet is determined according to the change rule of the included angle between the counterweight loading position and the electromagnet, and the current controller is controlled to adjust the current change of each electromagnet in real time, so that the electromagnetic force exerted on the rotor under the comprehensive action of the electromagnets always corresponds to the position and the size of the counterweight.

Technical Field

The invention relates to the technical field of rotating machine rotating balance fault diagnosis, in particular to a rotating machine dynamic balance weight online testing device and a rotating machine dynamic balance weight online testing method.

Background

During the operation of the rotary machine, the imbalance of the rotor is inevitable, particularly the mechanical vibration of high-speed rotation, and the imbalance of the rotor is the main exciting force of the rotor; for example, a fan, a water pump, a turbo generator set and the like, the main vibration cause is rotor imbalance, so that solving the rotor imbalance is an important measure for eliminating field operation vibration, and the cause of the rotor imbalance is caused by mass eccentricity of a rotor component and the like, so that in order to improve the mass eccentricity condition of the rotor component, a field dynamic balance test is often needed, the problem of improving the mass eccentricity of the rotor by monitoring vibration data of the rotor to perform dynamic balance weighting is carried out, and the long-term stable operation of the rotary machine is ensured. However, the existing dynamic balance is realized, vibration data are often measured and analyzed after equipment is started, then the equipment can be weighted after the equipment is completely stopped, the effect after the weighting is tried needs to be started again to check the weighting effect, if the effect is not ideal, the equipment needs to be frequently started and stopped, a large amount of time is consumed, and certain damage is possibly caused to the equipment.

The invention patent application with publication number CN111005768A discloses an electromagnetic counterweight device for an aircraft engine rotor, wherein permanent magnets are fixed on rotor blades, electromagnets are arranged outside stators, and the current pair of the electromagnets is controlled to change the adsorption force on the permanent magnets, so as to adjust the counterweight of the rotor, thereby reducing the weight of the rotor; the main purpose of this scheme is to reduce rotor self weight, produces the counter weight with the help of the effect of electromagnetic force, does not solve rotor self unbalanced problem.

Disclosure of Invention

The invention aims to provide a device and a method for online testing of a rotor counterweight, which can adjust the electromagnetic force in real time on line so as to balance the rotor mass.

The invention solves the technical problems through the following technical scheme: the utility model provides a rotating machinery dynamic balance counter weight on-line measuring device, includes the casing, and the rotor is installed in the casing to casing rotation relatively, casing surface is connected with vibration monitoring unit, evenly is fixed with at least three electro-magnet along rotor circumference on the casing, the electro-magnet is connected with the current controller electricity respectively, the rotor surface has the mark point, and the rotor outside still is fixed with the identification element towards the mark point, identification element communication connection has rotational speed monitoring unit.

The invention can obtain the time difference between two adjacent observed mark points through the identification unit and the rotating speed monitoring unit, thereby roughly determining the rotating speed of the rotor, can obtain the vibration condition of the rotor through the vibration monitoring unit, can determine the position and the size of the theoretical counter weight on the rotor based on the prior art, and on the basis, controls the current sizes of a plurality of electromagnets to provide attraction forces with different strengths and directions for the rotor, thereby simulating the effect of the counter weight, realizing the purpose of applying the counter weight to the rotor in the rotating process, and adjusting the current sizes of the electromagnets according to the subsequent test condition, thereby realizing the online test of the mechanical dynamic balance counter weight, being convenient to adjust, being capable of determining the position and the size of the counter weight through one-time test, and improving the efficiency.

Preferably, the vibration monitoring unit, the current controller and the rotating speed monitoring unit are respectively in communication connection with the controller, and the controller can display parameters in the rotating process of the rotor and send control signals.

Preferably, the mark points are reflective strips attached to the rotor, the identification unit is a laser sensor, and the rotating speed monitoring unit determines the rotating speed of the rotor according to the time difference between two times of identification of the mark points.

The invention also provides an online test method for the dynamic balance weight of the rotating machinery, which comprises the steps of

Step A: enabling the rotor to rotate freely, and recording the vibration condition and the rotating speed of the rotor based on the vibration monitoring unit and the identification unit;

and B: determining the position and the size of a counterweight on the rotor based on the vibration conditions of the rotor at different moments and the positions of the mark points at corresponding moments;

and C: the current controller is used for respectively controlling the current of each electromagnet, and the balance weight is applied to the rotor through electromagnetic force;

step D: repeating steps A-C until the rotor vibration is within the standard range, and recording the position and size of the counterweight.

Preferably, in step a, the rotation speed of the rotor in one turn is determined based on the time difference between two adjacent observation of the mark point by the identification unit.

Preferably, in step C, after the position and the size of the loading counterweight are determined, the relative position between the electromagnet and the counterweight is determined based on the relative position between the electromagnet and the mark point and the relative position between the counterweight and the mark point, and two electromagnets adjacent to each other before and after the counterweight position are searched, so that the electromagnetic forces provided by the two electromagnets are respectively:

wherein, F₁The electromagnetic force of the first electromagnet on the rotor, F₂The electromagnetic force of the second electromagnet on the rotor is alpha, theta and F, the central angle between the first electromagnet and the counterweight direction is relative to the rotor rotating shaft, and the centrifugal force exerted by the counterweight on the rotor is applied to the rotor.

Preferably, the rotor is controlled to rotate at a constant speed or a fixed function changing rotation speed, the change rule of the electromagnetic force provided by each electromagnet is determined according to the change rule of the included angle between the counterweight loading position and the electromagnet, and the current controller is controlled to adjust the current change of each electromagnet in real time, so that the electromagnetic force exerted on the rotor under the comprehensive action of the electromagnets always corresponds to the position and the size of the counterweight.

The rotary machine dynamic balance weight on-line testing device and the method provided by the invention have the advantages that: the time difference between two adjacent observed mark points can be obtained through the identification unit and the rotating speed monitoring unit, the rotating speed of the rotor is roughly determined, the vibration condition of the rotor can be obtained through the vibration monitoring unit, the position and the size of the theoretical counter weight on the rotor can be determined based on the prior art, on the basis, the current sizes of the electromagnets are controlled, attractive forces in different strengths and directions are provided for the rotor, the counter weight effect is simulated, the purpose of applying the counter weight to the rotor in the rotating process is achieved, the current sizes of the electromagnets can be adjusted according to the subsequent test conditions, the online test of the mechanical dynamic balance counter weight is achieved, the adjustment is convenient, the position and the size of the counter weight can be determined through one-time test, and the efficiency is improved.

Drawings

FIG. 1 is a schematic diagram of an online testing apparatus for a rotating mechanical dynamic balance weight according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an acting force of an electromagnet on a rotor of the online testing apparatus for a dynamic balance weight of a rotating machine according to an embodiment of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below in detail and completely with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the present embodiment provides an online testing device for a dynamic balance weight of a rotating machine, which includes a housing 1, a rotor 2 is installed in the housing 1 and can be driven to rotate, a vibration monitoring unit 3 is connected to a surface of the housing 1, at least three electromagnets 11 are uniformly fixed on the housing 1 along a circumferential direction of the rotor 2, the electromagnets 11 are electrically connected to a current controller 4, a marking point 21 is arranged on the surface of the rotor 2, an identification unit 6 facing the marking point 21 is further fixed on an outer side of the rotor 2, and the identification unit 6 is in communication connection with a rotating speed monitoring unit 61.

In the embodiment, the time difference between two adjacent times of observing the mark point 21 can be obtained through the identification unit 6 and the rotation speed monitoring unit 61, so that the rotation speed of the rotor 2 is roughly determined, the vibration condition of the rotor 2 can be obtained through the vibration monitoring unit 3, the theoretical counterweight position and size on the rotor 2 can be determined based on the prior art, on the basis, the current sizes of the electromagnets 11 are controlled, attractive forces with different strengths and directions are provided for the rotor 2, the counterweight effect is simulated, the purpose of applying the counterweight to the rotor 2 in the rotating process is realized, the current size of the electromagnet 11 can be adjusted according to the subsequent test condition, and the online test of the mechanical dynamic balance counterweight is realized.

The vibration monitoring unit 3, the current controller 4 and the rotating speed detection unit 61 are further respectively in communication connection with a controller 5, the controller 5 can display parameters in the rotor rotation process and send out control signals, the embodiment is summarized, the controller 5 is in communication connection with a computer 51, and the computer is at least one of a desktop computer, a notebook computer and a tablet computer and is mainly used for displaying parameters and inputting control logic and instructions.

The mark points 21 are reflective strips attached to the rotor 2, the identification unit 6 is a laser sensor, and the rotating speed monitoring unit 61 determines the rotating speed of the rotor 2 according to the time difference between two adjacent times of identification of the mark points 21.

The embodiment also provides an online test method for the dynamic balance weight of the rotating machine, which comprises the following steps:

step A: the rotor 2 is enabled to rotate freely, and the vibration condition and the rotating speed of the rotor 2 are recorded based on the vibration monitoring unit 3 and the identification unit 61;

wherein the rotational speed of the rotor 2 in one revolution is determined on the basis of the time difference between two adjacent observations of the marking point 21 by the recognition unit 6

And B: determining the position and the size of the counterweight on the rotor 2 based on the vibration conditions of the rotor 2 at different moments and the positions of the mark points 21 at corresponding moments;

and C: the current controller 4 respectively controls the current of each electromagnet 11, and a balance weight is applied to the rotor 2 through electromagnetic force;

referring to fig. 2, after determining the position and size of the loaded weight, determining the relative position of the electromagnet 11 and the weight based on the relative position of the electromagnet 11 and the mark point 21 and the relative position of the weight and the mark point 21, searching two electromagnets 11 adjacent to each other before and after the weight position, and applying current to the two electromagnets 11 to provide load to the rotor 2, the electromagnetic force provided by the two electromagnets 11 should satisfy the following condition:

the electromagnetic forces provided by the two electromagnets 11 obtained by the solution are respectively:

wherein, F₁The electromagnetic force of the first electromagnet (electromagnet B in FIG. 2) on the rotor, F₂The electromagnetic force of the second electromagnet (electromagnet A in figure 2) to the rotor, alpha is the central angle of the two electromagnets relative to the rotor rotating shaft, theta is the central angle of the first electromagnet and the counterweight direction relative to the rotor rotating shaft, and F is the centrifugal force exerted by the counterweight on the rotor.

Step D: repeating steps A-C until the vibration amplitude of the rotor 2 is within the standard range, and recording the position and size of the counterweight.

Based on the above formula, the rotor 2 is controlled to rotate at a constant speed or a fixed function changing rotation speed, the change rule of the electromagnetic force provided by each electromagnet 11 is determined according to the change rule of the included angle between the counterweight loading position and the electromagnet 11, and the current change of each electromagnet 11 is adjusted in real time through the current controller 4, so that the electromagnetic force exerted on the rotor 2 under the comprehensive action of the electromagnets 11 always corresponds to the position and the size of the counterweight, thereby realizing the online test and adjustment of the counterweight of the rotor 2, improving the test efficiency, being capable of continuously adjusting and being convenient to use.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.