JPH0820494A - Inverter hoist - Google Patents

Abstract

PURPOSE:To provide an inverter hoist of which work efficiency is improved by detecting a lifting height. CONSTITUTION:In an inverter hoist having an inverter 21 in a hoist main body 12 in which a lifting motor 18 is driven by receiving an output current of the inverter 21, it is provided with an encoder 26 installed on a speed reducer 17 drive-connected to the lifting motor 18, a control part 22 to drive the lifting motor 18 by adjusting the inverter 21 based on an output result of the encoder 26, and a display part 27 to display lifting by receiving an output of the inverter 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter hoist, and more particularly to an inverter hoist capable of easily and accurately detecting a lift.

[0002]

2. Description of the Related Art An electric hoist is, for example, a carrying device in a factory for unloading and horizontally moving luggage.
In this electric hoist, there is an inverter hoist that controls the hoisting motor (induction machine) with an inverter. In this inverter hoist, by detecting the value of the variable resistor that rotates in cooperation with the hoisting drum, it is possible to display the lift by changing the resistance value.

That is, in this inverter hoist,
A control box with a built-in inverter is provided in a hoist body that can move freely on a traverse rail, and a hand device push button is attached from this control box via a cable. On the other hand, the hoist body is equipped with a hoisting drum wound with a wire rope having a hook, and the hoisting drum is drivingly connected to a hoisting electric motor. A connecting gear meshes with the hoisting drum, and a potentiometer is attached to the connecting gear.

Therefore, when the operator operates the hand device push button, the hoisting electric motor is driven by receiving the output current of the inverter, and the hoisting drum is rotated to wind up or wind out the wire rope, thereby hooking the wire rope. Move up and down to load and unload luggage. Further, at this time, the potentiometer rotates with the rotation of the hoisting drum, and the lift is displayed by the change in the resistance value.

[0005]

In the above-mentioned conventional inverter hoist, the potentiometer is mounted on the connecting gear meshing with the hoisting drum, and the resistance value detected by the rotation of the potentiometer is adjusted. The head is detected by the change and is displayed. However, this potentiometer is a single-rotation type, and if the head is long, the detected resistance value will have some variations. Then, the error of the lift detection becomes large, and only the rough lift can be displayed, which may cause a trouble in the work, which is inconvenient.

The present invention solves such a problem, and an object of the present invention is to provide an inverter hoist with which the lift can be detected with high accuracy to improve the working efficiency.

[0007]

An inverter hoist of the present invention for achieving the above object has an inverter in a hoist body, and an inverter hoist driven by a hoisting motor in response to an output current of the inverter, A lift detection sensor mounted on a speed reducer drivingly connected to the hoisting motor, and a control unit that adjusts the inverter based on an output result of the heading sensor to drive the hoisting motor.
And a display unit for displaying the lift according to the output of the inverter.

[0008]

The lift detecting sensor detects the current lift from the output of the speed reducer drivingly connected to the hoisting motor, and the controller adjusts the inverter based on the output result of the hoisting motor to drive the hoisting motor. On the other hand, the head section is displayed on the display unit in response to the output of the inverter.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing an inverter hoist according to an embodiment of the present invention, FIG. 2 is a cross section showing a head detecting portion, and FIG. 3 is a flow chart of head detecting control.

As shown in FIG. 1, in an inverter hoist 10 of this embodiment, a hoist body 12 is movably supported by wheels 13 on a traverse rail 11.
This wheel 13 can be driven and rotated by a traverse electric motor 14. A hoisting drum 15 is mounted on one side of the hoist body 12, and a brake unit 16 to be described later is provided.
A speed reducer 17 having a motor (see FIG. 2) is mounted. A hoisting electric motor 18 is mounted on the other side of the hoist body 12, and the hoisting electric motor 18 is drivingly connected to the hoisting drum 15 via a speed reducer 17. And the winding drum 1
A wire rope 20 engaged with a hook 19 is wound around 6.

The hoist body 12 is provided with a control box 23 having an inverter 21 and a control unit 22, and the control box 23 has a hand-operated push button 25 through a cable 24.
Is connected. In addition, an encoder 26 is built in the speed reducer 17 so that the head can be detected.
The hand operation push button 25 is provided with a display unit 27 for displaying the lift.

Here, the speed reducer 17 having the encoder 26 built therein will be described in detail. As shown in FIG. 2, the drive shaft 3 of the hoisting electric motor 18 (see FIG. 1) is provided in the case 31.
An output shaft 33 connected to 2 is rotatably supported, and a brake unit 16 having an electromagnetic coil 34 is attached to the tip of the output shaft 33. Further, the output shaft 33 has a gear portion 35 formed at an intermediate portion thereof, and a support cylinder 36 connected to the hoisting drum 15 is provided at a base end portion of the output shaft 3.
3, and an output gear 37 is fixed to the support cylinder 36. On the other hand, an intermediate shaft 38 is rotatably supported in the case 31 in parallel with the output shaft 33. The intermediate shaft 38 has two large and small intermediate gears 3.
The large intermediate gear 39 meshes with the gear portion 35 of the output shaft 33, and the small intermediate gear 40 meshes with the output gear 37. The encoder 26 is attached to one end of the intermediate shaft 38. Reference numeral 41 is a brake cover.

Therefore, when the hoisting motor 18 is driven, the drive shaft 32 thereof rotates and the intermediate shaft 38 rotates via the output shaft 33, the gear portion 35, and the large intermediate gear 39. And
The reduced driving force is transmitted to the support cylinder 36 via the small intermediate gear 40 and the output gear 37 to rotate, and the hoisting drum 15
Can be rotated. At this time, the encoder 26 can detect the rotation speed of the intermediate shaft 38.

Then, the operation of the above-described inverter hoist 10 according to the present embodiment will be completed. As shown in FIG. 1, when the operator operates the hand device push button 25, the hoisting electric motor 18 receives and drives the output current of the inverter 21, and rotates the hoisting drum 15 via the speed reducer 17. Then, the wire rope 20 of the hoisting drum 15 is wound up,
Alternatively, by unwinding, the hook 19 is moved up and down to load and unload luggage.

At this time, the encoder 26 detects the current head from the rotation speed of the intermediate shaft 38 of the speed reducer 17, and the control unit 2
2 adjusts the inverter 21 based on the output result of the encoder 26 to drive the hoisting electric motor 18, while the display unit 27 receives the output of the inverter 21 and displays the hoist head.

That is, as shown in FIG. 3, the hoist is turned on and the upper limit switch is also turned on to adjust the origin. Then, when the hoisting electric motor 18 is driven to rotate the hoisting drum 15 and the hook 19 descends, the encoder 26 counts the number of pulses of the distance the hoisting drum 15 winds down. The detection pulse is input to the inverter 21, and when the detection pulse number and the set pulse number inside the inverter 21 match, the detection pulse is output to the hoisting motor 18 to shut off the control circuit and stop the hoist. On the other hand, the inverter 21 outputs the detected pulse number to the display unit 27 and the head is displayed.

As described above, in the inverter hoist of this embodiment, the encoder 26 is provided in the speed reducer 17, and the control unit 22 adjusts the inverter 21 based on the output result thereof to drive the hoisting electric motor 18. On the other hand, in response to the output of the inverter 21, the hoist head is displayed on the display unit 27, so that the hoist head can be detected easily and accurately. Also, the encoder 2
6 is provided in the speed reducer 17, the size of the entire hoist does not change, and there is no need for wind and rain countermeasures for outdoor use, and the parts can be unified.

Further, in the inverter hoist of this embodiment, when it is used for construction of sewer, the position where the operator operates the push button is 5 to 6 m, but when it is lowered to the pit by several tens of meters. Is effective for. Then, in order to use it at such a construction site, it is necessary to change the lifting height each time, and it is possible to cope with this by changing the set value on the inverter side.

In the above embodiment, the display unit 27
Although the handheld device push button 25 is provided, the installation position is not limited to this, and may be the hoist body 12, for example.

[0021]

As described above in detail with reference to the embodiments, according to the inverter hoist of the present invention, the hoist body has an inverter, and the hoisting motor drives the hoisting motor by receiving the output current of the inverter. In the hoist, a control unit that drives the hoisting motor by adjusting the inverter based on the output result of the heading detection sensor mounted on the speed reducer that is drivingly connected to the hoisting motor is provided, and the head output is displayed by receiving the output of the inverter. Since the display section for performing the above is provided, the lift of the hoist can be detected with high accuracy and easily recognized, and the working efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an inverter hoist according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a lift detecting section.

FIG. 3 is a flowchart of head detection control.

[Explanation of symbols]

 10 Inverter Hoist 11 Traverse Rail 12 Hoist Main Body 14 Traverse Motor 15 Hoisting Drum 17 Speed Reducer 18 Hoisting Motor 21 Inverter 22 Controller 25 Hand Operated Push Button 26 Encoder (Height Detection Sensor) 27 Display

Claims (1)

[Claims] 1. An inverter hoist having a hoist body having an inverter, and receiving a current output from the inverter to drive the hoisting motor, wherein the hoist detection sensor is mounted on a speed reducer drivingly connected to the hoisting motor. An inverter comprising: a control unit for adjusting the inverter based on the output result of the lift sensor to drive the hoisting motor; and a display unit for receiving the output of the inverter and displaying the lift. Hoist.