JPS58113093A - Stepless variable-speed device for moving travelling body - 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 The present invention relates to hoisting, customary,
This relates to a device that changes gears to a floor when there is no speed tLt for running, etc.

In conventional mobile vehicles, such as cranes for general cargo handling, hoisting, traversing, and traveling are all done by constant speed operation.
Alternatively, a stepped variable speed system is adopted.

In the former case, speeds other than the set value cannot be shifted at high speeds even when there is no load, so it is inefficient, and when low speeds are required, such as when installing machinery, it is not possible to reduce the speed to the desired speed, which is inconvenient. In addition, there are problems such as the occurrence of various S failures. Therefore, when there is such a demand, a variable speed drive device is used, but the speed change means is, for example, a secondary side resistance control of the electric motor, and a stepped p# variable speed is used. Is an inverter a stepless speed control method for motive 1? lIJ
There is an Ig10,000 type, but I have no luck using an inverter for the motor.
IiIlI@ll, regenerative braking that often occurs, for example, when the inverter setting value (i.e. frequency) is suddenly changed from a high speed value to a low speed value, or when a suspended load is being lowered by a crane etc. The torque generated when the motor rotates at high speed works as regenerative braking, but in the conventional structure, the generated electric power is returned to the power supply via an inverter. The structure is also complicated and expensive.

In addition, to change the speed, it is necessary to operate the frequency (speed) adjustment device provided on the inverter, and it is difficult to operate the inverter each time during crane operation, and it is difficult for the operator to operate the inverter. There was a problem in applying the inverter-based continuously variable transmission VL to anything other than the large $Tai traveling body.

Furu & Akira was made in consideration of this point, and it uses an inverter to perform stepless speed for each motor for hoisting, traversing, and traveling, and also transmits control signals to a push button switch for operating the traveling body. This mobile traveling body is attached to an actuator provided with the motor, and the speed can be easily changed at the same time as starting and stopping the motor, and the regenerative power generated during regenerative braking is contained in the resistor group, thereby simplifying the configuration. Our focus is to provide a continuously variable speed device.

The invention will be specifically described below based on embodiments shown in the drawings.

(The figure shows a push button from the floor) applied to an overhead crane operated by a push button? II, and the lane in which it runs (not shown) is equipped with a hoisting motor Ml as is well known.

A traversing motor MR1 is provided with a traversing motor M3, and an inverter speed control system is applied to each of the traversing motors. A traverse inverter A2 is provided for the running layer M3, and a running inverter A3 is provided for the running layer M3, and each inverter is operated based on a J-order from the control device. The control device C is connected with a round operating device that is operated from the floor, and the operating device DKri is connected to each of the above-mentioned screens.
The ninth ('!ml switch) of the forward/reverse drive command for the hoisting motor MIK, the lifting push button 1 and the lowering push button 2 for the hoisting motor MIK, and the traveling direction along the crane gutter for the traversing motor MB, e.g. The east row push button 3, the 100 row push button 4, and the travel motor M3 are provided with a push button 5 with a shoulder and a hole push button 6 according to their running directions.

A3 speed setting devices, namely a hoisting speed setting device 7, a traversing speed setting device 8, and a running speed setting device 9, are installed.For each of the above inverters, a regeneration control is performed using a resistor group, respectively.B1 ．． B1. B! I is connected to absorb the regenerated power generated as described above.6
- Operation by inverter for each motor! All territories are the same 1! For example, the operating procedure for the hoisting motor Ml will be explained based on Fig. 2. , is connected to a variable frequency inverter A11. The output frequency of the inverter is made variable by a signal from a pulse generator, for example, and a variable resistor 10t'i in the speed setting circuit is drawn out from the output terminals H, O, and L, and is installed in the operating device. The variable resistor 10Fi
Main l of hoisting speed setting 5iL device 7! constitute the department. The switch SWI is a forward rotation switch when the circuit is open, and a switch for reverse rotation, that is, raising and lowering when the circuit is closed. ON, when released it turns OFF
1 and each pushbutton 1.2 is O for switch SWI.
It is related to perform both N and OFF.

The regenerative braking unit) Bl is configured with a resistor n as a living body, and the inverter is equipped with a motor current detection means t (not shown), and when a roundworm current is generated, the regenerative braking unit is made to apply the current to the regenerative braking unit. In the figure, 20 is a thermal relay, 21 is a discharge resistor, and 22 is an emergency safety switch such as 4 o'clock.

Further, 30 is a starting circuit, and when the first pusher 51 is pressed and closed, the solenoid of the stain magnetic switch 52 is energized, and the self-holding hard point 34 is closed together with the Nr point 35 for the inverter AX.
Self-maintained. 35 is a stop press ml.

Next, about its effect? , when you press operation-〇 raising pushbutton 1, switch SWl turns OFF and switch S turns OFF.
W2 is turned ON and the hoisting motor Ml of the crane is driven. In this case, the hoisting speed IIt setting device 7 is connected to the variable resistor 1
It starts at the nine resistance value, that is, the speed, set by the o knob, but by increasing or decreasing the indication scale of the knob, the p resistance value changes, and the scissor resistance value is used as a gate signal to be stamped on the pulse generator, and the inverter is activated. Winding is performed at a predetermined frequency, that is, at a predetermined speed.

Next, when lowering the hoist, in the case of normal operation, the motor outputs the current and voltage tm, and based on this, the pulse -fll is output.
llll! is activated, the frequency of the inverter is controlled, and the inverter is lowered at a predetermined speed IfVc. However, when performing the roundworm side @, the regenerative energy generated at this time is applied to the regenerative braking (ennin) Bl, and the resistance group is Let's consume more. In this case, in the case of regeneration and +j14 sea bream, the frequency is low compared to the total operating time, so the power consumption is also low, and there is no cooling means for the resistor group.

As described above, according to the present invention, the inverter 11 controls the construction, i.e., hoisting, customary operation, and running of the moving body.
In addition to performing stepless speed change operation, the speed change &'il control device is connected to the operating device equipped with a start/stop button for the valley motor of the traveling body, allowing easy speed change by simply operating the knob. Now, the operator can operate at the optimal speed for transporting the load, improving efficiency through high-speed transport and precise operation of stopping positions, and operation with less slippage frequency due to frequency control using an inverter. It also has the advantage of being able to easily perform regenerative braking.

[Brief explanation of the drawing]

Fig. 1 is an overall block wiring diagram of a crane device to which the present invention is applied, and Fig. 1jg2 is a block wiring diagram of a hoisting motor. A1... Hoisting inverter A2... Traversing inverter A3... Traveling inverter Bl, 81 B! ...N student 111J motion unit D...
- Operator Ml...Hoisting motor M8...Traversing motor M3...Travel motors 1 to 6...Push button switch 7...Hoisting speed foot device 8...-Traversing Speed 11 + Setting device 9...Travel speed ItL setting'Ii! Equipment patent applicant: Hitachi Kikou II & Co., Ltd.
1 Agent Hayashi yf/Akira

Claims (1)

[Claims] S0 controls the speed of the MA Tai electric motor using an inverter.
In the speed control of the body, the operating device 1C equipped with a push button switch for the upper i-pi electric sea bream operation is generated by the frequency 1- of the inverter.
#In addition to installing a speed Ife regulator to control t, the regenerative power during regenerative braking is absorbed by the regenerative braking unit, which is a group of resistors, to imitate t-%! Continuously variable speed device for IPII11 running body.