JPS5845292B2 - How to stop the grinder at equilibrium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an equilibrium stopping method in a crusher such as a ball mill or rod mill for crushing lumps that is equipped with a drive motor separate from the drive motor.

A crusher such as a ball mill or a rod mill that crushes wind particles is equipped with a drive motor M that is separate from the drive motor M as shown in Fig. 1, and the back plate attached to the inside of the body 1 is inspected.
During replacement work, etc., this drive motor M is connected to the drive shaft of the crusher via an appropriate power disconnection device such as a clutch, chain, or other shaft coupling, and the drive motor M operates the chain transmission mechanism 2, Pinion 3, ring gear 4
After the fuselage 1 is driven at low speed in the direction of arrow a and stopped at a desired position, the electromagnetic brake MB is used to hold the fuselage 1 at a desired position, and the back plate is inspected and maintained.

However, in this case, since the center of gravity of the air body 5 filled in the fuselage 1 is shifted from the axis of the fuselage 1 due to the driving operation, the fuselage 1 is always rotated in the opposite direction (arrow b). Therefore, after the drive operation is completed, if the electromagnetic brake MB is released in order to disconnect the power intermittent device in order to return to normal operation in such a state,
Since the fuselage 1 suddenly reverses in the direction of arrow b and the drive device rotates at high speed, the drive device is damaged.

The present invention solves these conventional problems and is characterized by the fact that after the normal drive operation is completed,
A reverse command is given to the drive motor to reverse the drive motor so that the rotation speed is lower than that due to the wind load inside the crusher, and at this time, a braking force is applied to the crusher and the body is rotated. It's at the point where it stops.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. During normal operation, the crusher is driven by a drive electric motor (not shown), and when inspecting or replacing the back plate of the body 1, the At the same time as the electric motor is stopped, it is switched to the electric motor M for driving, and the electric motor M for driving drives the fuselage 1 at low speed in the forward rotation direction.This is done as follows.

That is, in FIG. 2, first the switch (10-8W) is turned on.

This is an abbreviation for SW on the 10th line, and the same applies hereafter).
1 is excited, the a contact 13-R1 is turned on, and the b contact 1B-R1 is turned off.

Then, when the drive start switch 13-PB1 is turned on, the relay 12-MC1 and the relay 13-MC2 are energized.
The indicator lamp 15-RL lights up.

The a contact 14MC1 is turned on by the excitation of the relay 12-MC0 and self-holds.

On the other hand, when the relay 13-MC2 is energized, the normal rotation a contact MC2 shown in FIG. 3 is turned on, the drive motor M rotates in the normal direction, and the body 1 of the crusher begins to rotate at a low speed in the direction of the arrow a.

At the same time, the a contact 17-MC2 turns on, and the relay 16
-R3 is excited and the a contacts 14-R3 and 16-R3 are turned on.

When the fuselage 1 rotates to the desired position, press the drive stop switch 13-PB2, which turns on the relay 12-MC1.
, 13-MC2 is demagnetized, and the normal rotation a contact MC2 in FIG.
is turned off, and at the same time as the drive motor M stops, the electromagnetic valve 1 is turned off.
/- Ki MB operates to hold fuselage 1 at the desired stop position,
The driving operation ends.

In this case, the wind bodies, balls, rods, etc. inside the fuselage 1 will not collapse unless the angle of inclination is approximately 30 degrees or more, so the load is applied to the fuselage 1 to rotate it in the direction of arrow b as described above ( There it is.

It goes without saying that the electromagnetic brake MB is released when current is flowing through the drive motor M, and is activated when no current is flowing.

Therefore, when transitioning to normal operation after the end of the drive operation, the switch io-sw is turned on to the reverse rotation side 1l-eL, a reverse rotation command is given to the drive motor M, and the reverse rotation returns the fuselage 1 to the equilibrium state. After that, the power cut-off device mentioned above is disconnected and the drive motor is switched on.

That is, the switches 1O-8W are set to the reverse side 1l-e4. When it is turned on, relay 1l-R2 is energized and a contact 14-R2,
21-R2 turns on.

At this time, since the a contact 14-R3 is already in the on state,
After turning on the a contact 14-R2, the starting switch 13-PBl
When you press , relay 14-MC3 is energized, the reverse rotation a contact MC3 shown in Fig. 3 is turned on, and the electromagnetic brake MB is released.
The driving electric motor M rotates in reverse.

On the other hand, a contact 19MC5 of relay 14-MC3 is turned on, relay 18-R4 is energized, and a contact 18-R, 20
-R4 is turned on, and the b contact 20-MC3 is turned off.

When the drive motor M rotates in the forward direction, a current is passed through the coil C as shown in FIG. 4A to generate a rotating magnetic field in the direction of the arrow a, thereby rotating the armature AM in the same direction. During reverse rotation, a rotating magnetic field (in the direction of arrow b) is generated as shown in FIG.

However, the center of gravity of the wind body 5 in the fuselage 1 is shifted, and a force that constantly tries to balance the fuselage 1 acts on it, and that force is applied to the armature AM of the drive motor M.
Simultaneously with the release of the electric brake MB, the armature AM rotates in the direction indicated by the arrow b, cutting off the external rotating magnetic field and generating an electromotive current (electromotive force) in the opposite direction on the coil C side.

When an electromotive current (electromotive force) is generated in this drive motor M by power generation, when it is detected as electric power, the current and voltage are detected by a current transformer 6 and a transformer 7, as shown in FIG. The electromotive force from these is detected by the wattmeter WM, and its pointer swings to one side.

When the value exceeds the set value of contact WM-H of wattmeter WM, this contact WM-H turns on and relay 2l-R
5 is excited, and its a contact 23-R5 is turned on.

As the fuselage 1 approaches an equilibrium state, the pointer of the wattmeter WM approaches zero, and when the pointer returns to the set value of the contact WM-L, this contact WM-L turns on, the relay 23R6 is energized, and the b contact 14-R6 turns off.

Therefore, the relay 14-MC3 is demagnetized, and the reverse a contact M
Since C3 is turned off, the electromagnetic brake MB operates at the same time as the drive motor M stops, braking and maintaining the fuselage 1 in an equilibrium state.Therefore, if you switch to the drive motor 1 after a certain time, you can avoid danger. It is possible to quickly shift to normal operation without any complications.

When the relay 14-MC3 is demagnetized, the B contact 20-MC3 is turned on, and since the A contact 2O-R4 is already on, the relay 2O-R7 is energized, and the B contact 16-R is turned off.
When relay 16-R3 is demagnetized, contact 16-R3 is turned off,
A contact 14-R3 turns off.

In other words, once the fuselage 1 is in an equilibrium state, the forward rotation side 9e
Turn on switch 10-8W to K, energize relay 13MC2, energize relay 16-R3, a contact 16-R3,
Since the a contact 14-R3 is off unless the contact 14-R3 is turned on, it will not rotate in the reverse direction.

In other words, they actively prevent it from rotating.

Relay 20R7 is for protection.

Although Fig. 3 shows a drive motor M with a built-in electromagnetic brake MB, in the case of a separate electromagnetic brake MB type, the relay 13-MC3 is installed in the DC power supply circuit as shown in Fig. 5.
, 14-MC3 may be interposed with a contacts MC2 and MC3, respectively.

As described in detail in the embodiments above, in the present invention, after the end of the inch movement, the drive electric motor is reversed so that the rotation speed is lower than the rotation speed due to the wind load O inside the crusher, and at that time, the drive motor is The electromotive force or electromotive force generated in the drive motor is detected, and when this becomes zero or a set minute value, braking force is applied to the crusher, so the drive motor acts to brake the rotation of the crusher. , the crusher can be returned to an equilibrium state safely and smoothly, and handling is easy and safe when transitioning to normal operation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a configuration diagram of a drive system, FIG. 2 is a control circuit diagram, FIG. 3 is a power supply circuit diagram of a drive motor, and FIGS. 4A and B are a drive motor. Action explanatory diagram, 5th
The figure is a power supply circuit diagram of the electromagnetic brake. 1... body, 5... wind body, M...
...Drive electric motor, MB...Electromagnetic brake, W
M...Power meter.

Claims (1)

[Claims] 1. In the drive operation of a crusher such as a ball mill or rod mill for crushing lumps that is equipped with a drive motor separate from the drive motor, after the normal drive operation is completed, a reverse command is given to the drive motor, and the drive motor is The motor is reversed so that it rotates at a lower speed than the rotation speed due to the wind load inside the crusher, and the electromotive current or electromotive force generated in the drive motor at this time is detected, and the electromotive force or electromotive force is determined to be zero or set. An equilibrium stopping method for a pulverizer, characterized in that a braking force is applied to the pulverizer when the value reaches a very small value.