KR20090042102A

KR20090042102A - Velocity control apparatus for electric hoist

Info

Publication number: KR20090042102A
Application number: KR1020070108014A
Authority: KR
Inventors: 남상경; 이광기
Original assignee: 주식회사 고려호이스트
Priority date: 2007-10-25
Filing date: 2007-10-25
Publication date: 2009-04-29

Abstract

The present invention relates to a speed control apparatus for an electric hoist mounted on an electric hoist for moving an animal using an electric motor, the speed control device for controlling the speed of the electric motor; A down button for manipulating the animal to descend; A speed adjusting unit connected to the electric motor to adjust the speed of the electric motor and to control the forward and reverse rotation of the electric motor when the up and down buttons are input; High speed setting resistance means connected in series with the input terminal of the speed control unit in a high speed section in which the up or down button is input once; Low speed setting resistance means connected in series with the high speed setting resistance means in a low speed section in which the rising button or the falling button is input twice; And a low speed control volume connected in series with the resistance means for setting the low speed, the low speed control volume allowing a manual operation of the speed of the motor in the low speed section, wherein the speed in the high speed section is kept constant. It is possible to arbitrarily adjust the speed, increase the ease of operation to facilitate manual guide work of the animal, and more particularly relates to a speed control device for an electric hoist suitable for continuous repetitive work.

Description

Velocity control apparatus for electric hoist

The present invention relates to a speed control device for an electric hoist, and more particularly, to a speed control device for an electric hoist installed in a small hoist to control an electric motor in two speeds, so that the speed can be arbitrarily adjusted only in a low speed section. It is about.

In general, an electric hoist is a device for lifting or lowering an object using an electric motor, and is a device mainly used for moving a heavy object. 1 illustrates a typical electric hoist. Referring to this, the hook 3 is provided at one end of the hoisting rope 1, and the hook 3 is fastened to the animal 5 of the weight to be moved. This electric hoist is connected to the other end of the rope (1) is connected to an electric motor, not shown, by winding or loosening the rope (1) by the rotational force of the electric motor to move the hook (3) in the vertical or horizontal direction.

The electric hoist as described above is mainly used to move the animal 5 to the desired place through the forward and reverse rotation of the motor using a single-phase electric motor. At this time, the reverse rotation control and the speed control of the motor is very important.

The speed control device for a conventional electric hoist is configured to control only forward and reverse rotation of the electric motor. This electric hoist is mainly used for lifting work, it was difficult to handle the delicate and impossible to handle the delicate work.

Along with this, in recent years, electric hoists having two modes of high speed section and low speed section have been mainly used by dividing the rotational speed of the electric motor into two stages. For example, when lifting or horizontally moving the animal 5, the motor rotates at high speed to increase the working speed. When the animal 5 is put down or other precise position control is required, the motor is rotated at low speed to control work precision. Increase However, such an electric hoist has a disadvantage that the work speed is very slow in the low speed section. Therefore, it is not suitable in places requiring continuous repetitive work due to increased process time.

Alternatively, electric hoists have been developed that can arbitrarily adjust the rotational speed of the electric motor in all sections. This electric hoist has the advantage of working at the desired speed across the entire road, but there is always the hassle of adjusting the speed. In particular, while pressing the up or down button with one hand, the other hand is inconvenient to operate the speed control switch at all times. This inconvenience in operation makes it difficult to manually guide the assembly in order to allow the assembly to be moved to an appropriate position during the lowering operation of the assembly in an assembly line or the like.

The present invention has been proposed to solve the above problems, by controlling the speed of the motor in two stages, by maintaining a constant speed in the high-speed section and controlling the speed can be adjusted only in the low-speed section, the process required time It provides a speed control device for the electric hoist which is particularly suitable in places where the animal can be manually guided properly, and the fragile object can be handled easily and the continuous repetitive work is required. The purpose is.

The objects of the present invention are not limited to the above-mentioned objects, and other objects which are not mentioned will be clearly understood by those skilled in the art from the following description.

Speed control device for an electric hoist of the present invention for achieving the above object is mounted on an electric hoist for moving the animal using an electric motor, in the speed control device for an electric hoist for controlling the reverse rotation and speed of the electric motor Up button for manipulating the animal to raise; A down button for manipulating the animal to descend; A speed adjusting unit connected to the electric motor to adjust the speed of the electric motor and to control forward and backward rotation of the electric motor when the up and down buttons are input; High speed setting resistance means connected in series with the input terminal of the speed control unit in a high speed section in which the up or down button is input once; Low speed setting resistance means connected in series with the high speed setting resistance means in a low speed section in which the rising button or the falling button is input twice; And a low speed control volume connected in series with the low speed setting resistor and configured to manually operate the speed of the motor in the low speed section.

According to a preferred embodiment of the present invention, the control unit further includes an emergency stop button installed at an input of the speed control unit and selectively blocking power applied to the speed control unit.

In addition, the present invention may further include a resistance against short circuit is connected in parallel to the input terminal of the speed control unit.

More preferably, the speed control apparatus for an electric hoist of the present invention is such that the up button, the down button, the low speed control volume, and the emergency stop button are arranged on a control box operated by a user.

According to the speed control apparatus for an electric hoist of the present invention, the speed of the motor is kept constant in the high speed section in which the up and down buttons are input once, and the low speed control volume is used in the low speed section in which each button is input twice. By arbitrarily adjusting the speed of the motor, the ease of operation is increased in the high speed section where speed control is relatively unnecessary, and the speed adjustment operation is simplified in the low speed section to manually guide the position of the animal. Ease of use is improved, handling of fragile objects is easy, and it has an effect suitable for a place requiring continuous repetitive work.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various forms, and the present embodiments are merely provided to make the disclosure of the present invention complete and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, the invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

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

First, the speed control apparatus for an electric hoist of the present invention is a device for controlling the reverse rotation and the speed of an electric motor. In the following description, a detailed description of the general configuration of the electric hoist is similar to that of the conventional electric hoist. In addition, in the following description, the general structure of the electric hoist can be understood with reference to FIG.

2 is a circuit diagram showing an example of a speed control apparatus for an electric hoist according to the present invention. Referring to this, the present invention is mounted on the electric hoist for moving the animal using the electric motor, the speed control unit 10 for controlling the forward and reverse rotation and speed of the electric motor, the rising button 12, the rising contactor 14 And a lowering button 16, a lowering contactor 18, a high speed setting resistance means 20, a low speed setting resistance means 22, and a low speed control volume 24.

The speed control unit 10 is installed between the electric motor and the input power side, and means for controlling the forward and reverse rotation and speed of the electric motor. For example, the speed control unit 10 may be a terminal for supplying input power to the motor, and further, may be a converter for converting the input power to match the rated power of the motor.

The up button 12 and down button 16 are provided as push buttons, as shown in the circuit diagram of FIG. In the present embodiment, the up button 12 and the down button 16 are configured such that a switch used as a contact point of the magnetic contactor and a switch for controlling power input to the speed adjusting unit 10 are interlocked to operate. As shown, the rising button 12 is connected to the rising contactor 14 in series. The rising contactor 14 is an electromagnetic contactor for inputting a power supply to the speed control unit 10 so that when the rising button 12 is input, the rotation direction of the motor is determined in the animal rising direction. Similarly, the down contactor 18 is connected to the down button 16 in series, and the down contactor 18 has a speed such that when the down button 16 is input, the rotation direction of the motor is determined in the animal down direction. It is a magnetic contactor for supplying the supply power to the control unit (10).

For example, when the up contact 12 is input, the movable contact of the uplink contactor 14 is input, and the electric motor is rotated forward by the speed control unit 10. On the contrary, when the down button 16 is input, the motor is reversed. Can be controlled to reverse rotation. Of course, the direction of rotation of the electric motor may be set to be reversely rotated when the animal rises and forward rotated when the animal descends.

The high speed setting resistance means 20 is a resistor connected in series to the input terminal of the speed control unit 10 in a high speed section in which the rising button 12 or the falling button 16 is input once. The resistance value of the high speed setting resistance means 20 may be selected to have an appropriate value depending on the purpose of the electric hoist. The low speed setting resistance means 22 is a resistor connected in series to the high speed setting resistance means 20 in a low speed section in which the rising button 12 or the falling button 16 is input twice. The resistance value of the low speed setting resistance means 22 may also be selected to an appropriate value depending on the purpose of the electric hoist. Preferably, the resistance value of the low speed setting resistance means 22 is selected such that the basic speed of the low speed section has a value of 1/2 compared to the high speed section.

In the present invention, the ascending and descending of the animal has two speed modes which are divided into a high speed section and a low speed section. The up and down buttons 12 and 16 are operated in a toggle switch type, and the motors are operated in a high speed mode when each button 12 and 16 are input once, and in a low speed mode when inputted once more. . Of course, when the buttons 12 and 16 are input again in the low speed mode, the mode is switched back to the high speed mode. That is, the expressions of one-time input and two-time input of the up button 12 and the down button 14 mean that the high speed mode and the low speed mode are selected by a toggle method.

At this time, the speed control apparatus for an electric hoist of the present invention is characterized in that the speed of the motor is kept constant in the high speed section, and the speed can be arbitrarily changed in the low speed section. For this purpose, the low speed control volume 24 is connected in series to the low speed setting resistance means 22. The low speed control volume 24 is a variable resistor that variably adjusts the input power applied to the speed adjusting unit 10 in the low speed mode in which the up button 12 and the down button 16 are input twice. Therefore, in the low speed section in which the up button 12 or the down button 16 is input twice, the low speed control volume 24 is adjusted so that the user can arbitrarily adjust the speed of the motor.

That is, the present invention is to maintain a constant speed in a relatively high speed section that does not require speed control to eliminate the hassle of operation, and to adjust the speed of the motor arbitrarily in a low speed section requiring the descending work and precise position control work of the animal do.

Meanwhile, as shown in FIG. 2, the speed control apparatus for the electric hoist according to the present invention further includes an emergency stop button 26 for emergency stop. The emergency stop button 26 is installed at the input terminal of the speed control unit 10 and selectively cuts off the power applied to the speed control unit 10. As an example, the emergency stop button 26 is provided as a B-contact type pushbutton in which normally closed contacts are opened upon button input. When the emergency stop button 26 is automatically returned and closed, the circuit works normally again. Of course, when the emergency stop button 26 is automatically returned after being manually operated, the emergency stop button 26 may be designed to maintain the circuit disconnection state unless the restart switch is operated.

In addition, the present invention may further be connected to the resistance means for preventing short circuit 28 in parallel to the input terminal of the speed control unit 10 in order to prevent the short circuit of the power supply line applied to the speed control unit 10. The short circuit prevention resistance means 28 is designed to have a high resistance value as much as possible.

3 shows a control box 30 in which input means are arranged in the present invention. Referring to this, the emergency stop button 26, the low-speed control volume 24, the up button 12, the down button 16 are arranged in a vertical direction on the front of the control box 30. This control box 30 configuration provides significant convenience in operating each button. For example, in a job that does not require precise position adjustment, each of the up and down buttons 12 or 16 disposed on the control box 30 is input once to set the high speed section, and then the motor is operated at high speed. To drive. At this time, in a process requiring precise position control, such as a step of lowering the animal to a predetermined position, the lower button 16 disposed on the control box 30 is input twice to set the low speed section. The knob of the low speed control volume 24 is rotated to set the desired speed in advance. Thereafter, if the down button 16 is pressed, the hook of the hoist descends at a low speed at a preset speed. At this time, while the operator presses the down button 16 with one hand, the operator can guide the animal with the other hand and change the position appropriately.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, the embodiments described above are to be understood in all respects as illustrative and not restrictive.

For example, although the speed control device, which is a key feature of the present invention, has been described as being limited to being applied to a hoist, it is obvious that the hoist may be applied to a winch used as well as the same function.

1 is a view schematically showing the configuration of a general electric hoist

2 is a circuit diagram showing an example of the speed control device for an electric hoist of the present invention;

Figure 3 is a front view showing a control box configuration in the present invention

10: speed control unit 12: up button

14: up contactor 16: down button

18: down contactor 20: resistance means for high speed setting

22: resistance means for low speed setting 24: volume for low speed control

26: emergency stop button 28: short circuit resistance means

30: control box

Claims

In a speed hoist for an electric hoist mounted on an electric hoist for moving an animal using an electric motor and controlling forward and reverse rotation and speed of the electric motor,

An elevation button for manipulating the animal to ascend;

A down button for manipulating the animal to descend;

A speed adjusting unit connected to the electric motor to adjust the speed of the electric motor and to control the forward and reverse rotation of the electric motor when the up and down buttons are input;

High speed setting resistance means connected in series with the input terminal of the speed control unit in a high speed section in which the up or down button is input once;

Low speed setting resistance means connected in series with the high speed setting resistance means in a low speed section in which the rising button or the falling button is input twice; And

And a low speed control volume connected in series with the low speed setting resistor and configured to manually operate the speed of the motor in the low speed section.

The method of claim 1,

And an emergency stop button installed at an input end of the speed regulating unit and selectively shutting off power applied to the speed regulating unit.

The method of claim 1,

Speed control device for an electric hoist characterized in that it further comprises a resistance means for preventing short circuit is connected in parallel to the input terminal of the speed control unit.

The method of claim 2,

Speed control device for an electric hoist further comprises a control box in which the rising button, the down button, the low-speed control volume, and the emergency stop button is disposed.