JPH0743118Y2 - Inverter operating device for electric hoist - Google Patents

Description

[Detailed Description of the Invention] A. Industrial Field of Application The present invention relates to an inverter operating device in which an inverter hoist can set a frequency setting VR remotely.

B. Outline of the Invention The present invention is an inverter hoist equipped with a frequency setting VR, which drives a variable mechanism for changing the frequency setting VR on the hoist body side by operating the operation push button. It eliminates the action of an operator or climbing to the hoist body side.

C. Conventional technology and its problems An electric hoist is, for example, a transportation device in a factory for loading and unloading and moving north, south, east, and west, and an operator operates a push button on the hand to load or unload a package to a desired location. It is to carry. Of these, the hoist body is used to move on the traverse rails and to load and unload cargo.

8 to 11 are configuration diagrams of a conventional electric hoist, and FIG. 8 is a hoist body 2 moving on a traverse rail 1.
It is equipped with a control box 3 with a built-in inverter.
1 shows a configuration having a hand operation push button 6 suspended from a hoist body 2 including a cap tire cable 4 and a shield wire 5, and a configuration in which a frequency setting VR 7 is provided on the operation push button 6 side.

On the other hand, FIG. 9 is an example in which a crane control box 9 with a built-in inverter is arranged on the traverse rail 1 of the hoist crane 8. The control box 9 and the hoist body are connected, and the hoist body 2 is connected to the cable 4 and the shield wire. 5 is connected to an operation push button 6 having a push button 7.

In the configuration shown in FIGS. 8 and 9, since the frequency setting VR 7 is present on the hand operation push button 6, the operator can change the frequency as desired. The shield wire 5 is required, and a thin wire is used due to the nature of the wire 5. As a result, wiring of the shield wire 5 is required, and use of the shield wire 5 thinner than other wires is inconvenient in consideration of disconnection.

FIG. 10 and FIG. 11 show an example in which the frequency setting VR is provided in the control box 3 provided in the hoist body 2. In FIG. 10, the frequency setting VR is arranged in the inverter-equipped control box 3 attached to the hoist body 2, and the control box 3 and the operation push button 6 are connected only by the cap tire cable 4.
Further, in FIG. 11 as well, since the frequency setting VR is built in the crane control box 9 on the traverse rail 1, the connection between the hoist body 2 and the operation push button 6 is limited to the cap tire cable 4. It has a configuration according to.

In the configuration shown in FIGS. 10 and 11 as described above, since the hoist body 2 side is provided with the frequency setting VR,
The shielded wire as shown in Fig.8 and Fig.9 is not necessary, but when the operator tries to change the frequency, climb the high place to open the control box on the hoist body 2 and adjust the frequency setting VR. It is extremely troublesome and dangerous.

Therefore, the present invention provides an electric hoist inverter operating device that does not require shielded wires and does not require height adjustment work.

D. Means for Solving the Problems The present invention that achieves the above-mentioned object is an electric hoist having a motor connected to a power source via an invar, and the inverter having a VR for frequency setting. A hoist drive button and an up-down button are provided as operation push buttons that can be suspended by a single cable, and a relay panel that is driven by being connected to the hoist drive button is used to set the frequency that is driven by being connected to the up-down button. The feature is that each electric hoist body is equipped with a VR variable mechanism.

E. Action For frequency setting by driving the variable mechanism by operating the push button at hand
You can adjust the value of VR.

F. Embodiment An embodiment of the present invention will now be described with reference to FIGS. In FIG. 1, a control box 3 is arranged on the hoist body side with respect to the operation push button 6 at hand, and the operation push button 6 and the control box 3 are connected by a cable 10.
In the control box 3, an inverter 11 is built in.
VR12 for frequency setting is connected to 11, and for frequency setting
A frequency setting VR variable mechanism 13 for adjusting the VR 12 is connected. The frequency setting VR variable mechanism 13 has a push button 6 at hand.
Connected to the up / down button. On the other hand, the up / down / left / right relay board 14 in the control box 3 is connected to the up / down / left / right buttons of the push button 6 so as to drive the inverter 11 by a system different from the frequency setting VR.

In this way, the frequency setting VR 12 is arranged for the operation push button 6 at hand through the cable 10, and the frequency setting VR variable mechanism 13 in the control box 3 has the same value as the frequency setting VR 12 value. The driving part is provided to change the temperature and has a structure as shown in FIG.

In FIG. 2, a drive motor 13a and a speed reducer 13b for reducing the motion of the motor 13a have a structure including a gear 13c connected to the speed reducer 13b and a gear 12a of the frequency setting VR 12. The gear 13c is provided with a mechanical stopper 13d, for example, as shown in FIG. 3, in order to prevent the gear 13c from overshooting due to the driving of the motor 13a. In such a structure, when the motor 13a is driven, the frequency setting VR12 can be moved and adjusted via the speed reducer 13b and the gears 13c, 12a.

FIG. 4 shows an electric circuit of the drive motor 13a. When the up button 6a or the down button 6b of the operation push button 6 at hand is pressed, the relay MCU or MCD is turned on, and the contact MCU or MCD of this relay is turned on to drive the motor. 13a will be forward or reverse.

FIG. 5 shows an example in which an electric stopper is provided in the electric circuit. The limit switch LSU is provided between the up button 6a or the down button 6b of the operation push button 6 at hand and the relay MCU or MCD.
Or with LSD. This limit switch is L
SU is opened at the upper limit of up and LSD is opened at the lower limit of down.

The configuration shown in FIG. 2 is a mechanical one of the frequency setting VR variable mechanism 13, while FIGS. 6 and 7 show an electrical one of the frequency setting VR variable mechanism 13. In FIG. 6, the frequency setting device in the inverter 11 is for frequency setting.
Resistors R _{1 to} R ₄ are connected in parallel as VR. Then, relay XU to short the resistor R _1, R _2, R ₃ at contact points on, the contacts of the _{XD X 1, X 2, X} 3 are disposed. Relay x
U and XD are up button 6a and down button 6b among the operation push buttons 6 at hand.
It operates by turning on. Therefore, the degree of, for example, contact X ₁ operates relay XU presses the up button 6a is turned to short-circuit the resistor R _1, and then contact X ₂ are short-circuited to be turned resistor R ₂ Pressing A resistance change is made. On the contrary, when the down button 6b is pressed, the resistance increases in order.
X _3, X _2, becomes X ₁ opens it.

Explaining in more detail in FIG. 7, for example, when the up button 6a is pressed, the relay XU is excited and the contact XU is closed,
Relay X ₁ is excited and contact X ₁ self-holds. By turning on the contact X _1, the resistor R ₁ is short-circuited as shown in FIG. 6 to change the input of the inverter frequency setting device.

Next, by pushing the up button 6a, the relay X ₂ is excited, the contact X ₂ performs self-holding, and the resistor R ₂ is short-circuited.
Further, by pushing the up button 6a, the contact X ₃ relay X ₃ is energized to short the charged resistor R _3.

On the other hand, when the down button 6b while doing the self-holding is depressed relay Y ₃ releases the self-holding of the relay X ₃ opens the contact Y ₃ is excited by the contact X _3. Then, when the down button 6b is pressed, the relay Y ₂ is excited and the contact Y ₂ is opened to release the self-holding of the relay X ₂ . Furthermore, the contact Y ₁ relay Y is energized by pushing the down button 6b releases the self-holding relay X ₁ is opened. Thus resistors R _3, R _2, R ₁ is that is sequentially inserted.

As described above, pressing the up button 6a raises the frequency, and pressing the down button 6b lowers the frequency.

G. Effect of the Invention According to the present invention as described above, by pressing the input signal contact to the frequency setting VR to the pushbutton switch, (1) VR is not directly attached to the pushbutton switch. , It is possible to use the same cables as other operation lines without using shielded wires.

(2) When working at a constant frequency (constant speed),
The VR input signal contact can be used to set the frequency to match the work speed.

(3) When deflecting the frequency, it can be done with a push button switch at hand, and it is not necessary to open the hoist control box.

[Brief description of drawings]

1 to 7 are embodiments of the present invention, FIG. 1 is an overall configuration diagram, FIG. 2 is a configuration diagram of a mechanical variable mechanism, FIG. 3 is an explanatory diagram of a stopper, and FIG. 4 and FIG. Is a motor drive circuit diagram, FIG. 6 and FIG. 7 are configuration diagrams of an electric variable mechanism, and FIGS. 8 to 11 are configuration diagrams of conventional inverter hoists. In the figure, 3 is a control box with a built-in inverter, 6 is an operation push button, 6a is an up button, 6b is a down button, 10 is a cable, 11 is an inverter, 12
Is a frequency setting VR, and 13 is a frequency setting VR variable mechanism.

Claims (1)

[Scope of utility model registration request] 1. An electric hoist having a motor connected to a power source via an invar and having a frequency setting VR in the inverter, wherein a hoist drive button is used as an operation push button suspended from the electric hoist body by a single cable. And an up / down button, and a relay panel connected to and driven by the hoist drive button, and a frequency setting VR variable mechanism connected to and driven by the up / down button, on the electric hoist body, respectively. An electric hoist inverter operating device characterized in that