CN203443733U - High-speed wire drive cabinet cooling fan motor balance correction device - Google Patents

Abstract

The utility model discloses a dynamic balance correcting device for a cooling fan of a high-speed wire transmission cabinet, which comprises a fan rotor and a motor stator which are fixedly connected, and also comprises a supporting platform, wherein a connecting flange is arranged at the middle position of the supporting platform, and the motor stator is fixedly connected with the supporting platform through the connecting flange; the motor stator is connected with a starting control panel through a power line, and the starting control panel is connected with a power supply; an acceleration sensor of the vb3000 vibration measuring instrument is horizontally placed at the extension part of the connecting flange, and a non-contact phase sensor is placed on the supporting platform. The dynamic balance of the cooling fan of the transmission cabinet is corrected through the device, and the stable and reliable operation of the corrected cooling fan after installation and use is ensured. The corrected transmission cabinet cooling fan can reach the design allowable unbalanced residual quantity, so that the design service life of the original transmission cabinet cooling fan is prolonged by 12480 hours. The dynamic balance correction method can be widely applied to the dynamic balance correction of the cooling fan of the main transmission cabinet and the cooling fan of the main motor of the rolling mill in the field of steel rolling.

Description

High-speed wire drive cabinet cooling fan motor balance correction device

technical field

The utility model relates to a dynamic balance correction device, in particular to a high-speed wire transmission cabinet cooling fan dynamic balance correction device.

Background technique

The main drive of the high-speed rolling line adopts the AC-DC-AC frequency conversion system of Siemens 6SE70 series full digital control. The monitoring of the vibration and deterioration trend of the cooling fan of the 6SE70 series transmission cabinet is a weak link. The consequences caused by the abnormality of the cooling fan of the transmission cabinet are: the operating temperature of the transmission cabinet exceeds the range, which reduces the service life of the electronic components in the transmission cabinet and increases maintenance costs. ;The temperature of the transmission cabinet is out of range, which leads to the shutdown of the entire rolling line; the vibration of the cooling fan causes the electronic components and wiring in the transmission cabinet to loosen, and a short-circuit blasting accident occurs.

The cooling fan is installed on the upper part of the transmission cabinet through a drawer, and the AC 220v power supply is provided in the transmission cabinet. When the cooling fan is running, the heat emitted by the power components in the transmission cabinet is discharged to the top of the transmission cabinet, so that the temperature in the transmission cabinet can be maintained for a long time. Stay within the specified range. The cooling fan is mainly composed of a stator, a componentized fan rotor, a drawer-type fixed box, and a control power supply. The componentized fan rotor realizes the integrated assembly of the fan blades and the motor. The design of the cooling fan is compact and requires high assembly accuracy. It is not only necessary to ensure the dynamic balance of the motor rotor mass point, but also to ensure the dynamic balance of the cooling fan blade mass point offset. Since the cooling fan of the transmission cabinet is enclosed and installed in the transmission cabinet, in order to ensure the stable operation of the cooling fan, the current manufacturer mainly uses the dynamic balance correction of the cooling fan after assembly, but after a period of operation (17520 hours), due to the Due to wear, vibration and other reasons, the factory-configured balance mass point lead on the outer ring of the motor rotor falls off. When the fan rotor rotates around its axis at high speed, due to the uneven mass distribution relative to the axis, the center of gravity and the center of rotation are offset. Centrifugal force is generated and the original dynamic balance is destroyed, so the monitoring of the vibration and deterioration trend of the cooling fan of the transmission cabinet is extremely important.

When the cooling fan of the high-line transmission cabinet is used online to the design life of 17520 hours, the technical problem of on-site vibration monitoring cannot be realized because the cooling fan of the transmission cabinet is installed in a closed manner. When the cooling fan of the transmission cabinet is used online to the design life of 17520 hours, only To replace the new fan, since no domestic manufacturer has used the cooling fan for Siemens 6SE70 series drive cabinets for domestic transformation, the maintenance cost remains high.

Utility model content

The purpose of this utility model is to provide a high-speed wire transmission cabinet cooling fan dynamic balance correction device, which can perform dynamic balance correction for the transmission cabinet cooling fan, and ensure that the calibrated cooling fan runs smoothly and reliably after installation.

In order to achieve the above object, the technical scheme that the utility model takes is:

A cooling fan dynamic balance correction device for a high-speed wire drive cabinet, including a fixedly connected fan rotor and a motor stator, and a support platform, the connecting flange is placed in the middle of the support platform, and the motor stator passes through the connecting flange It is fixedly connected with the support platform; the motor stator is connected to the start control board through the power line, and the start control board is connected to the power supply; the acceleration sensor of the vb3000 vibration measuring instrument is placed horizontally on the extension of the connecting flange, and the vb3000 vibration measurement The instrument's non-contact phase sensor is placed on the support platform.

The platform surface of the supporting platform is a plain carbon steel plate, and a connecting hole connected with the connecting flange is provided, and the lower part of the platform is fixedly connected with a supporting plate.

The non-contact phase sensor of the vb3000 vibration measuring instrument is adsorbed on the support platform through a magnetic base.

Using the high-speed wire drive cabinet cooling fan motor balance correction device provided by the utility model can perform dynamic balance correction on the cooling fan used for more than 17520 hours. The cooling fan runs smoothly and reliably after installation and use. Moreover, the calibrated drive cabinet cooling fan can reach the design allowable unbalanced residual amount, prolonging the designed service life of the original drive cabinet cooling fan by 12480 hours. The high-speed wire drive cabinet cooling fan motor balance correction device can be widely used in the steel rolling field for the main drive cabinet cooling fan and the rolling mill main motor cooling fan motor balance correction, which solves the difficult technical problem of the imported cooling fan motor balance correction, and extends the The service life of the cooling fan is extended, which directly reduces the cost of production, maintenance and operation.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure, 1-fan rotor, 2-motor stator, 3-fan blade, 4-reflective tape marking point, 5-angle marking point, 6-counterweight lead block hole, 7-supporting platform, 8-connecting flange, 9-square head bolt, 10-hexagon socket head bolt, 11-bearing, 12-start control board, 13-non-contact phase sensor of vb3000 vibration measuring instrument, 14-shaft retaining ring, 15-hole retaining ring, 16- The acceleration sensor of the vb3000 vibration measuring instrument.

Detailed ways

The utility model will be further described in detail below in conjunction with specific embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

As shown in Figure 1, the high-speed wire transmission cabinet cooling fan dynamic balance correction device provided by the utility model includes a fixedly connected fan rotor 1 and a motor stator 2, fan blades 3 are installed on the fan rotor 1, and a support platform 7 is also included , the connecting flange 8 is placed in the middle of the supporting platform 7, the motor stator 2 is fixedly connected to the supporting platform 7 through the connecting flange 8, the motor stator 2 is connected to the start control board 12 through the power line, and the start control board 12 is connected to the power supply connect. The acceleration sensor 16 of the vb3000 vibration measuring instrument is placed horizontally on the extension of the connecting flange 8, and the non-contact phase sensor 13 of the vb3000 vibration measuring instrument is adsorbed on the support platform 7 through a magnetic base.

A shaft retaining ring 14 is installed on the outer retaining ring groove on the shaft of the fan rotor 1, and a retaining ring 15 for the hole is installed in the inner retaining ring groove on the motor stator 2 hole, and the retaining ring 14 for the shaft and the retaining ring 15 for the hole pass through the bearing 11 Fixed connection. The platform surface of the square supporting platform 7 is plain carbon steel plate, the acceleration sensor 16 of the vb3000 vibration measuring instrument is placed horizontally on the extension of the connecting flange 8, and the non-contact phase sensor 13 of the vb3000 vibration measuring instrument is adsorbed on the supporting platform 7 through a magnetic base On, it is connected to the vb3000 vibration measuring instrument through its own connection. The platform surface of the square support platform 7 is provided with a connection hole connected with the connecting flange 8 , and a support plate is welded on the bottom of the platform to strengthen the strength of the support platform 7 . The connecting flange 8 is placed in the middle of the supporting platform 7. After the motor stator 2 and the connecting flange 8 are connected with the hexagon socket bolt 10 and aligned, use the lag bolt 9 to pass through the connecting hole on the supporting platform 7 plane and connect to the connecting flange 8. M10 thread fastening connection.

The working process of the high-speed wire transmission cabinet cooling fan motor balance correction device provided by the utility model is as follows:

1. Remove the cooling fan drawer-type fixed box from the high-speed wire transmission cabinet, and then remove the componentized fan rotor 1 and motor stator 2 in the drawer-type fixed box.

，根据上述测量数据，理论计算一个平衡质点铅块脱落后冷却风机所产生离心力

。 2. Place the dismantled fan rotor 1 and motor stator 2 horizontally on the support platform 7, check the amount of lead weights falling off in the balance weight lead block hole 6 on the outer ring of the motor rotor configured by the factory, and use a ruler and a vernier caliper Measure the diameter d and height L of the original counterweight lead block installation hole, and then measure the distance from the center of the original counterweight lead block installation hole to the centerline of the fan rotor

, according to the above measurement data, theoretically calculate the centrifugal force generated by the cooling fan after the lead weight of a balanced mass falls off

.

calculation steps:

(1) Calculate the weight m of a lead block, according to m=ρ·A·L, formula,

In the formula: m-the weight of the lead block (g), ρ-the density of the lead (ρ=11.34g/cm ³ ), L-the height of the lead block hole (L=1.2cm), d-the diameter of the lead block hole (d= 0.8cm), lead block sectional area-A,

。 but:

.

， (2) Calculate the centrifugal force generated by the cooling fan after the lead weight of a balanced mass falls off

,

according to ,

-铅块安装孔的中心到风机转子中心线距离（

=78mm），n-转速（冷却风机工作转速2850r/min），

-转子旋转的角速度（

）； In the formula: m - the mass of the lead block (g), G - the weight of the lead block (N), g - the acceleration of gravity (g=9.81m/s ² ),

- The distance from the center of the lead block installation hole to the centerline of the fan rotor (

=78mm), n-speed (cooling fan working speed 2850r/min),

- the angular velocity of the rotor rotation (

);

=（0.087/9.8)×0.078×84665.48=57.8N； but:

=(0.087/9.8)×0.078×84665.48=57.8N;

(3) Theoretical calculation of the allowable unbalance of the cooling fan rotor: Eper=(G×1000)/(n/10)

In the formula: Eper-allowable balance degree (μm), G-balance accuracy grade (refer to ISO1940 international standard, classification of rotor type use conditions, select the balance accuracy of the cooling fan of the transmission cabinet to G6.3 level), n-operating speed (n= 2850r/min),

Then: Eper=(6.3×1000)/(2850/10)=22.1μm;

(4) Calculate the allowable maximum residual unbalanced mass: m=(Eper×M)/r,

In the formula: m-allowable residual unbalance (g), M-mass of fan rotor (M=15kg), r-test configuration radius (mm), according to the actual measurement, the radius of the test balance weight is r=185mm, then: m=22.1×15/185=1.79g.

3. Mark the angle scale from 0 to 359 on the edge of the fan rotor 1 with the angle mark point 5, stick the reflective tape to the mark point 4 of the reflective tape of the fan rotor 1, and fix the non-contact phase sensor 13 of the vb3000 vibration measuring instrument on the support On the platform 7, align with the reflective tape marking point 4 on the fan rotor 1, place the acceleration sensor 16 of the vb3000 measuring instrument horizontally on the extension of the connecting flange 8, and insert the start control board 12 into the external 220V power socket.

4. Press the switch on the start control panel 12 to start the cooling fan rotor 1 to the operating speed, use the vb3000 vibration measuring instrument to measure the initial vibration and phase angle of the unbalanced cooling fan rotor through the acceleration sensor 16 and the non-contact phase sensor 13, and test Add the counterweight m to the 90° position of the angle marking point 5 of the fan rotor 1, and measure its vibration response. According to the recommendation of the vb3000 vibration measuring instrument, add the counterweight to the corresponding angle marking point 5 of the fan rotor to confirm the rotor The balance effect, the residual unbalance of the fan rotor 1 can be eliminated by the above-mentioned correction device.

The above are only preferred embodiments of the utility model, and do not limit the utility model. It should be pointed out that for those of ordinary skill in the art, under the technical inspiration provided by the utility model, other equivalent modifications and improvements can also be made, all of which can achieve the purpose of the utility model, and should be regarded as the invention of the utility model. protected range.

Claims (3)

1. a high-speed rod transmission cabinet cooling blower dynamic balance calibration device, comprise the fan rotor (1) and the motor stator (2) that are fixedly connected with, it is characterized in that, also comprise support platform (7), joint flange (8) is placed on the medium position of described support platform (7), and described motor stator (2) is fixedly connected with support platform (7) by joint flange (8); Described motor stator (2) is connected with startup control panel (12) by power lead, starts control panel (12) and is connected with power supply; The acceleration transducer of vb3000 vibration measuring set (16) lies in a horizontal plane in the extension place of described joint flange (8); The noncontact phase detector (13) of vb3000 vibration measuring set is placed in described support platform (7).

2. high-speed rod transmission cabinet cooling blower dynamic balance calibration device according to claim 1, it is characterized in that, the flat surface of described support platform (7) is straight carbon steel steel plate, is provided with the connecting hole being connected with described joint flange (8), and the bottom of platform is fixedly connected with back up pad.

3. high-speed rod transmission cabinet cooling blower dynamic balance calibration device according to claim 1, is characterized in that, the noncontact phase detector (13) of described vb3000 vibration measuring set is adsorbed in described support platform (7) by magnetic bases.

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