JPS6227295A - Variable speed winding machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a variable speed hoisting machine that uses an inverter to control a hoisting machine driven by a motor.

[Conventional technology]

FIG. 5 is a diagram showing a conventional variable speed hoisting machine disclosed in Japanese Patent Application Laid-Open No. 58-197195. In the figure, (1)
is a motor, (2) is an inverter that controls the rotational speed of this motor (1), (3) is a push button operation box, and (4) and (5) are respectively arranged in this push button operation box (3) and are in the first stage. A two-stage push-button switch for hoisting and a two-stage push-button switch for hoisting that instructs low-speed operation at the second stage and variable-speed operation at the second stage, and (6) continuously changes the variable speed output of the inverter (2). Speed variable device consisting of volume, (7) is push button operation box (3
) is a cable that outputs the signal of each switch (41 (51) and speed variable device (6)), and a signal line (7a) that outputs the signal of the push button switch (41 (51) and a signal that outputs the signal of the volume (6) (8) is a control bag that controls the inverter (2) by the signal from the cable (7) (fit-+9).
1': Installed n inverter t2) (n is a speed setting device that makes variable speed output a constant output.

Next, the operation will be explained. The speed of the motor (1) is continuously controlled by the output of the inverter (2), and the speed command is given by the speed setter (9) in the control bag W+81 during low-speed operation, and by the push button operation box (3) during high-speed operation. ) and is output to the inverter (2) via the control device (8). This will be explained with reference to FIG. First, time 1. By pushing the two-stage hoisting push button switch (4) to the first stage at time t2, hoisting drive of the motor (11) is started and the speed is accelerated from vl to v2.At time t2, the speed v2 By the way, the speed ■ is determined by setting the speed setting device (9) in advance, and is set to a constant low speed.Furthermore, at time t1, the two-stage winding push button switch ( 4)
By pushing to the second step, the speed can be accelerated from v2 to V. At time [4], velocity v3 is reached. By the way, the speed V3 is determined by setting the speed variable device (6) in advance.
), its size can be continuously changed by changing its rotational position.

For example, if the rotational position of the speed variable device (6) is changed while operating at the hoisting speed V, the magnitude of the hoisting speed V3 is changed, and the motor (1) is driven at the lower rotational speed. be done.

Next, when the two-stage winding push button switch (4) is returned to the first stage at the time of opening t3, the speed is decelerated from ■ to V. At time t6, speed V2 is reached. Further time t
If you release the winding two-stage push button switch (4) at point 7,
The speed of motor (1) decreases toward vl, and motor (11) stops at time ts.

[Problem that the invention seeks to solve]

Conventional variable speed hoisting machines are constructed as described above, and the cable has a signal wire for the high-power circuit for the push button switch and a signal wire for the low-power circuit for the volume control.
Noise is propagated from the strong current circuit signal line to the low current circuit signal line in the cable, causing the inverter to malfunction (there is a risk that shielded wire must be used to reduce this, making the cable expensive). (There was also the problem that it was difficult to reproduce the speed because it was continuously variable control using the volume. Also, it was difficult to reproduce the speed when the volume was set appropriately.) After that, if you want to move on to the next task at high speed in order to shorten the travel time, you have to turn the volume every time, which is very inconvenient.

This invention was made to solve the above-mentioned problems, and it allows users to work at low speeds and move at high speeds repeatedly without having to turn the volume every time.It also prevents the inverter from malfunctioning due to noise. The purpose of this invention is to obtain a variable speed hoist that can reduce the cost of cables and easily reproduce the speed.

[Means for solving problems]

The variable speed hoisting machine according to the present invention includes a speed variable device that changes the rotational speed of the motor by controlling an inverter and changing its output, and a two-stage pushbutton switch mounted on a pushbutton operation box. It is.

[Function] The variable speed hoist according to the present invention operates the hoist at high speed on the second stage of the two-stage push button switch, and by attaching the first stage to the push button operation box and operating the speed variable device. , by changing the speed command and changing the rotational speed of the motor via the inverter 2, more variable speed operation can be achieved.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, (4F) and (4S) are the normally open contacts of the first and second stage, respectively, of the two-stage push button switch (4) for hoisting, and (5F>, (5S) are the two-stage normally open contacts for hoisting down. Type push button switch (
5), the first and second stage normally open contacts, αQ is a relay for hoisting instructions, αD is a relay for hoisting instructions, (2)
) is a relay for high-speed operation instruction, (Rlm), (
R2a) and (R3i)1. respectively IJlz−Q[I
, Qfi and α9 normally open contacts, (R, b) is relay 04
, a3 is the bias resistor for maintaining the lowest speed even when the speed variable device (6) or the speed setter (9) is set to the lowest speed, and 04 is the inverter (2).
) is reversed when it starts outputting! relay, (R4m)
is its normally open contact, slope is the brake of the hoisting machine, e2D is a magnet that is energized when the normally open contact (R41) is closed, and (Mla) is its normally open contact.

Descriptions of other symbols are omitted as they are the same as the conventional system.

Next, the operation will be explained using FIGS. 1 and 2.

First, at time to, the two-stage push button switch for winding (4)
When pressed to the first step, the normally open contact (4F) closes, the normally open contact (R, I) of relay 01 closes, and the inverter (2)
In order to input a hoisting command to the inverter (2), the frequency is gradually increased in the phase order in which the motor +11 rotates normally, and when a predetermined frequency is reached [1], the inverter (2) outputs the frequency to the motor (1). Relay α (is energized. Therefore, the normally open contact (R
41) is closed and the normally open contact (Mla
) is closed, the brake (e) is released, and the motor (1
] starts hoisting drive, and the inverter (2) increases the output frequency up to the frequency specified by the speed variable device (6), so that the speed V1 changes to V! and reaches the speed v2 at time t2.

Furthermore, when the pushbutton switch (4) is pushed to the second stage at time point [3], the normally open contact (4S) is also closed, the normally closed contact (R3b) of the relay (2) is opened, and the normally open contact (R3m) is closed. For closing, the speed variable device (6) is disconnected and a speed setting device (9) is connected to the inverter (2) in its place. Inverter (
2) increases the output frequency to the point specified by the speed setting device (9), and further increases the speed from the speed V;
The speed v3 is reached at time t4.

Next, at time ts, when the pushbutton switch (4) is returned to the first stage, the normally open contact (4S) opens, the normally open contact (R3m) of the relay @ opens, and the normally closed contact (R3b) closes. Therefore, the speed setter (9) is disconnected and a speed variable device (6) is connected to the inverter (2) instead. The speed is v
2 and reaches the time point [6]. Furthermore, when the push button switch (4) is released at time t1, the normally open contact (4F) opens and the normally open contact (Rla) of relay QCI.
is opened and there is no longer a lowering command to the inverter (2), so the inverter (2) starts decelerating further from the speed v2, and at the time ta when the speed v1 is reached, the inverter (2) stops energizing the relay 04. Then the normally open contact (R4 pin) opens,
The normally open contact (Mla) of the magnet (C) is opened and the brake (E) is applied, so that the motor (1) stops the hoisting drive. In addition, when the lowering push button switch (5) is pressed, the normally open contact (R2m) is closed and the inverter (
In order to input a lowering command to 2), the frequency is increased in the phase order in which the motor (1) reverses, and the same operation as during hoisting is performed.

By the way, in the above explanation, the speed variable device (6) consisting of a volume was explained, but as shown in Fig. 3, a rotary switch is attached to the push button operation box (3), and the first to fifth relay gradients ), any one of the normally open contacts (Rs a ) to (R71) is closed, and the settings are set stepwise in the order of the first, second to fifth contacts. The first variable resistor (to), the second variable resistor αG
- A command from any one of the fifth variable resistors Q7+ is input to the inverter (2) to select the speed of the motor (1) in steps. In this case, in the push button operation box (3),
Only the rotary switch... and the push button switch (41 (5+) are arranged, and each variable resistor OI9 to aη is arranged in the control device (8), and the strong signal line and the weak signal line are parallel to each other. This is avoided by using relays (2) to @.

For this reason, it is possible to prevent a stubborn signal line from entering the circuit of the variable resistor (to) to Oη.

In addition, instead of the speed variable device (6) consisting of a volume, as shown in Figure 4, by using a digital potentiometer that changes the resistance tap step by step in proportion to the number when the displayed number is changed, The speed of the motor (1) can be changed in steps.

〔Effect of the invention〕

As described above, according to the present invention, the speed variable device that changes the rotational speed of the motor and the two-stage pushbutton switch are attached to the pushbutton operation box, so it is possible to work at low speeds and at high speeds without having to turn the volume every time. This has the effect of preventing inverter malfunctions due to noise, making cables cheaper, and making it easier to reproduce speeds.

In addition, by integrating the first switch and the second switch into a two-stage push button switch, operability is further improved. By changing the rotational speed in stages, it is possible to easily reproduce a desired speed suitable for the work.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing one embodiment of this invention, Fig. 2 is a diagram of its operating characteristics, Fig. 3 is a circuit diagram showing one embodiment of this invention, and Fig. 4 is another embodiment of this invention. Circuit diagram showing 5th
The figure is a circuit diagram of a conventional device, and FIG. 6 is a diagram of its operating characteristics. In the figure, (1) is the motor, (2) is the inverter, and (3) is the motor.
) is the push button operation box, (4F), (5F) are the first switch, (4S), (5S) are the second switch, ..., ...,
The symbol (9) is a speed variable device, and the speed setting device (9). Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (4)

[Claims] (1) In a hoisting machine whose driving source is a motor controlled by an inverter, a speed variable device that controls the inverter and changes its output to change the rotational speed of the motor, and a speed variable device that controls the inverter. a speed setting device that sets the output to a preset constant output and rotates the motor at a certain high speed; a first switch that connects the inverter and the speed variable device; and a first switch that connects the inverter and the speed setting device. A variable speed hoist comprising: a second switch for connection, and the speed variable device is mounted on a push button operation box. (2) The speed variable device is a continuous speed variable device that continuously changes the output of the inverter to continuously change the rotational speed of the motor. variable speed hoist. (3) The variable speed hoisting machine according to claim 1, wherein the first switch and the second switch are integrated two-stage push button switches. (4) The speed variable device is a step speed variable device that changes the rotational speed of the motor in steps by changing the output of the inverter in steps. variable speed hoist.