KR0143435B1 - Moving method and apparatus of vibrator - Google Patents

Abstract

The present invention relates to a starting method and apparatus for driving a vibration controller or an exciter using an eccentric weight. More specifically, the eccentric weight located under the rotating disc in a stationary state uses a starting motor and a gear having a very high reduction ratio. This method relates to starting by raising the potential energy to the highest position, and using a DC motor connected to the reduction gear to reduce the vibration using eccentric weight or to reduce the starting torque of the excitation device. After reaching the position by the proximity sensor, it is characterized by the drive control method (squeen control) by the starting motor device and the drive motor, and the two-axis drive excitation or vibration reduction device using the above two methods.

Description

Vibration reduction and starting method and device using eccentric weight

1 is an eccentric weight drive device configuration

2 is pulse connection module wiring diagram

3 is a circuit diagram of a starting motor control panel

4 shows the centrifugal force synthesis vector of the eccentric weight

5 is the change of eccentric potential energy

* Explanation of symbols for the main parts of the drawings

SM: Starting Motor CM: Driving Motor

NS: Proximity switch N1, N2: Reduction gear

PC: pulse control module X1, X2: relay

T1, T2: Timer 1: Eccentric Weight

2: rotating disc 3: vortex coupling

The present invention relates to a starting method and apparatus for driving a vibration controller or an exciter using an eccentric weight. More specifically, the eccentric weight located under the rotating disc in a stationary state uses a starting motor and a gear having a very high reduction ratio. To raise the potential energy to the highest position.

Vibration reduction, which is used for the vibration characteristics analysis of bridges, high-rise buildings, offshore structures, or seismic tests, and that eliminates or reduces abnormal vibrations of the hull caused by vibrations generated by reciprocating engines installed as main engines in ships. The excitation device rotates two eccentric weights so that the synthesized centrifugal force vector acts up and down or left and right, so that the vibration wave is in phase with the main vibration frequency.

In general, a ship equipped with a diesel engine, which is a reciprocating engine, as a main engine, when the ship is in resonance with the hull due to an unbalance amount or an unbalance moment due to the reciprocating mass, abnormal vibrations occur, which may cause damage to the ship's habitability and navigational propulsion system. Adversely affects. To solve this problem, eccentric weights with large moments of inertia (hereinafter referred to as GD ² ) have been rotated at twice the speed of diesel engines in opposite directions to each other, so that the forces in the horizontal direction collide with each other and generate only the forces in the vertical direction. The above problems are solved by using a vibration reducer which eliminates the vibration generated in the hull by causing the vibration of the vibration wave generated from the diesel engine to be up and down caused by the eccentric weight and phase.

In this case, the vibration reducer generates vibration only because of the centrifugal force generated by rotating the eccentric weight, so once the start is completed and the normal operation is performed, the motor that rotates the eccentric weight hardly takes a load, thus causing the motor to produce shaft bearings and gears. In consideration of loss torques such as friction torque, stirring torque of lubricating oil, acceleration torque at speed change, etc., it is possible to rotate the eccentric weight sufficiently even with a small capacity electric motor.

In practice, however, in the stationary state of vibration reduction, the center position of the eccentric weight is in the direction of the rotational axis in accordance with the gravity field. Therefore, in order to enter the large eccentric weight of the GD ² into the rotational motion, it generates a very large torque compared to the aforementioned torque. The reality is that you are using an electric motor that you can.

In other words, it is light load in normal operation, but it uses a large-capacity motor only for short time during start-up, so the power consumption is increased and it is not suitable for ship vibration reduction and when the large eccentric weight of GD ² enters the rotary motion. Since the starting current is very large and a short time, there is a fatal flaw that it is necessary to increase the capacity of the generator that supplies the electric motor to increase the flow of the starting current. Therefore, a countermeasure is always desired.

It is an object of the present invention to provide a method and apparatus for starting a new vibration reducer capable of rotating an eccentric weight even with a small drive motor that can be driven during normal operation in order to solve the above problems of the prior art. .

In order to achieve the above object, the present invention provides a method of starting with a required DC motor connected to a reduction gear to reduce vibration or reduce starting torque of an excitation device using an eccentric weight, and when a counterweight reaches an uppermost direction, a proximity sensor. A drive control method (squaen control) by the start motor device and the drive motor after position detection, and a two-axis drive excitation or vibration reduction device using the above two methods.

According to the present invention as described above, a very large starting torque is required in order to start after rotating the heavy eccentric weight located at the lowermost part at a low speed in a stopped state, but after one rotation, friction of the support bearing or the driving motor is lost. It is possible to reduce the driving motor capacity of the eccentric weight because the normal operation continues even if only the rotation torque that compensates for it is possible. Therefore, the vibration cost can be reduced or the size and starting current of the excitation device can be reduced, thus reducing the manufacturing cost and operating cost. . In addition, according to this starting method, since the starting current can be lowered, it is possible to reduce the generator capacity for only a short time, thereby reducing power consumption by 60%.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The configuration diagrams of the starting motor SM, the reduction gears N1 and N2, and the driving motor CM used during the normal operation to move the eccentric weight upward are as shown in FIG. 1, and the driving motor CM And a pulse control module (PC) for operating the vortex capping 3 between the rotating disc 2 with the eccentric weight 1 attached thereto is the same as the third degree.

Referring to the above starting sequence, when the start button start (Start) is pressed in FIG. 3 to operate the relay (X1), the driving motor (CM) operates to operate the driving motor (CM) in a state where the eddy current coupling (3) does not operate. Timer (T1, T2) and relay (X2) are operated at the same time, and after 5 seconds, relay (X1) is activated and start motor (SM) is started by battery power supply (DC 2V). When a pulse signal is generated from the quick contact switch NS immediately before falling by rotating in the direction of rotation, the pulse controller PC operates to excite current to the eddy current coupling 3 of the driving motor CM in the pulse control module PC of FIG. Flows to continue to rotate the eccentric weight (1) and at the same time the relay (X6) is activated to start the motor (SM) is stopped.

The starting system SM is stopped even when no pulse signal is generated because the eccentric weight 1 does not approach the proximity switch NS even after 30 seconds due to an abnormal starting system. Eccentric weight (1) attached to two rotary disks (2) rotated by drive motor (CM) and reduction gears (N1, N2) to generate vibration or counter electromotive force using centrifugal force by eccentric weight (1) When the centrifugal force is generated, the composite vector F of centrifugal force can be considered as shown in FIG. The reduction ratios of the driving motor side reduction gear N1 and the starting motor side reduction gear N2 configured as shown in FIG. 1 are n1 = 3 and n2 = 166/9, respectively, and the rotation speed of these motors is N1 = 1,750. When the output of driving motor (CM) and starting motor (SM) required when rpm, N2 = 2,000rpm and the combined centrifugal force of eccentric weight F = 7,500㎏.f is calculated and compared.

(A) Calculation of output of drive motor

When the weight of the eccentric weight is W (㎏), the center of gravity of the eccentric weight r (m), the acceleration of gravity g (= 9.8m / sec ² ) and the rotational angular velocity W (= 2πN1 / 60N1), the combined centrifugal force F and the torque Wr The relationship between

F = (W / g) rw ² = (W / g) r (2πN1 / 60N1) ²

7,500 = {2 × 3.14159 × 1,750 (60 × 3)} ² Wr / 9.8 = 380.8Wr

Wr = 7,500 / 380.8 = 19.70 (kg.m)

Therefore, L1 is the output of drive motor

L1 = 0.746Wrw / 75 = 0.746 × 19.70 × {2 × 3.14159 × 1,750 / (60 × 3)} / 75 = 11.97 (Kw)

(B) Calculation of starting torque for rotating the eccentric weight

When the eccentric weight is rotated while the eccentric weight is rotated to move the eccentric weight from the bottom to the top in the stopped state as shown in FIG.

Ep = Wh = 2Wr = 2 × 19.70 = 39.4 (kg.m)

Since this corresponds to twice the required torque Wr of the drive motor during normal operation, the output L2 of the drive motor by the starting torque 2Wr required to move the stopped eccentric weight from the bottom to the top is

L2 = 2L1 = 2 × 11.97 = 23.94 (Kw)

Therefore, the total output L3 of the drive motor is the sum of the output L1 required for normal operation and the output L2 required to move the eccentric weight to the top during starting.

L3 = L1 + L2 = 11.97 + 23.94 = 35.91 (kw) ≒ 36 (kw)

Here, if there is no friction loss of the drive shaft support bearing, heat dissipation of the drive motor, output loss of the cooling blower, wind power loss of the rotating disc, etc. It is possible to operate forever without this, but in reality, since there is a loss horsepower listed above, the eccentric addition is completed and the drive output of less than 2kw is required in normal external abduction, but the drive motor of about 14kw is used in consideration of the durability of the drive motor.

(C) Output calculation of starting motor

When calculating the output L4 of the starting motor used to raise the eccentric weight to the top as shown in Fig. 5, the starting torque is inversely proportional to the reduction ratio of the reduction gear, so the total reduction ratio of the reduction gear n = n1.n2 = 3 × 166/9 = 55.34 And the torque Ts of the starting motor because the number of rotations N2 = 2,000RPM during the load operation of the starting motor

Ts = Wh / n = 2Wr / n = 39.4 / 55.34 = 0.712 (kg.m)

L4 = 0.746 × 0.712 × (2 × 3.14159 × 2,000 / 60) /75=1.49 (Kw)

In consideration of the durability of the starting motor, when the output of the DC motor driven by battery power (24V DC) is selected as 2kw, the capacity of the driving motor is reduced by almost 62% from 36kw to 14kw, which can reduce manufacturing cost or power consumption.

In this way, the starting method of the present invention is configured to reduce the rotational speed of the eccentric weight and increase the weight and the center distance when the exciter or vibration reduction device generates the same centrifugal force.

In the present invention as described above, a very large starting torque is required for starting after rotating the heavy eccentric weight located at the lowermost position at a low speed from the top of the stationary state, but after one rotation, the friction of the support bearing or the driving motor is compensated. Normal operation continues even if only enough rotation torque is applied, so it is possible to reduce the drive motor capacity of the eccentric weight, and to reduce vibration or reduce the size and starting current of the excitation device, thereby reducing the manufacturing cost and operating cost. In addition, according to this starting method, since the starting current can be lowered, it is possible to reduce the generator capacity for only a short time, and thus the power consumption can be reduced by 60%.

Claims (2)

In order to reduce vibration by using eccentric weight or to reduce starting torque of the excitation device, press the start button Start to start the drive motor CM so that the drive motor CM operates while the vortex capping 3 is not operated. At the same time, the timers T1 and T2 and the relay X2 are operated to start the starter motor SM to generate a pulse signal from the proximity switch NS just before the eccentric weight 1 rotates to the top and falls. (PC) operates to keep the eccentric weight (1) continuously rotating, and at the same time, the relay (X6) is operated to stop the starting motor (SM) and there is a problem in the starting system. Vibration reduction and starting method using the eccentric weight, characterized in that the control to stop the start motor (SM) even when the pulse signal does not generate close to the switch (NS). Install the rotary disc 2 with the eccentric weight 1 in the direction in which the proximity switch NS is installed, and connect the shaft with the reduction gear N1 to the driving motor CM via the vortex coupling spring therebetween. ) And at the same time connect the reduction gear N2 to the starter motor SM in the reduction gear N1 and connect the proximity switch NS to the pulse control module PC, which is the starter motor ( SM) and vibration reduction and excitation device starting device using an eccentric weight, characterized in that the electrical connection to control the drive motor (CM).