JPH0769582A - Electric hoist with emergency brake releasing device - Google Patents

Abstract

PURPOSE:To let a cargo fall approximately at constant speed by actuating an operation button switch from the ground at the time of a power failure for releasing a brake force with direct current from a battery, and adjusting the moment of inertia with the mechanical loss of a brake rotor or the like. CONSTITUTION:A brake 16 is released to let a cargo fall, when a power failure takes place. Namely, a pushbutton is pressed to cause a DC solenoid to attract a brake lever 7 for the turn thereof. As a result, a brake rod 7 is pulled back against the force of a brake spring 4, and the pushing force of a brake disc 2 disappears. Thus, brake torque drops to zero level. In this case, a clutch gear rotating only at the time of a power failure, a gear 12, a brake rotor 11, a brake wheel 1 and the like act as resistance to rotation. (Namely, these act as a mechanical loss for retarding rotational acceleration.) Furthermore, the moment of inertia increases, when the weight of the brake rotor 11 is adjusted (i.e., change in diameter and thickness) and the cargo continues to gradually fall without any sudden acceleration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hoist having an AC brake using a three-phase induction motor or an AC rectifying DC brake, and is used for work that requires urgent unloading in the event of a power failure. Electric hoist.

[0002]

2. Description of the Related Art Figures 5 and 6 show the conventional type.

FIG. 5 is an external view of a conventional type, and FIG. 6 is a cross-sectional view of a key brake portion.

The brake rod 5 for pressing the brake lever 3 overcomes the brake spring 4 of the manual brake lever 7 by the force to release the pulling brake force.

As for the manual brake lever 7, the double rail type is upward so that it can be operated by riding on a girder, and the monorail type is downward so that it can be operated from below by using a mobile scaffold.

Since it is not possible to instantaneously cope with this, for momentary correspondence, a method of hanging a string or a chain and pulling it, a bicycle wire, a grip with a grip to pull the manual brake lever 7 is used. There is a wire method, etc.

The method of directly moving the lever for manual operation by human hands is reliable in operation, but cannot be dealt with immediately when a power failure occurs.

Although the string, the chain and the wire can be dealt with instantly, the string and the chain obstruct the work.

Especially in the case of a wire, twisting the wire,
If it is bent, the wire will be pulled and the brake will be released when it is not intended.

Further, if the manual operation is not intermittently performed, there is a drawback that the load may be accelerated and dropped, and the operation needs attention.

[0011]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention
An object of the present invention is to provide a brake release device that releases a load by a simple operation during a power failure to unload (fall) a load, and at the same time, to drop at a constant speed so as not to accelerate and drop.

In the quenching work, when the processed product is heated to the quenching temperature and placed in an oil tank and stopped due to a power failure, the processed product cannot be rapidly cooled and becomes defective. There is a risk of sticking.

Even in the plating work, if a power failure occurs just before the next process, the processed product may become defective, and there is a need to unload the product urgently.

In general cargo handling work as well, there is a need to unload a load for the time being in the event of a power failure or an abnormality.

[0015]

The operation is carried out by a normal operation push button switch.

The emergency brake is operated by a small direct current battery which is relatively close to an automobile or a motorcycle.

A torque transmission gear and a brake rotor are installed between the motor and the brake. These generate mechanical loss that acts as resistance when dropped (lowered), and the torque transmission is turned on and off by the clutch by changing the operation method during normal operation and during abnormal operation.

[0018]

[Function] The DC battery is used as the power source of the brake release device in case of power failure.

The operation button switch is an operation button for displaying an abnormal condition and for operating the brake releasing device.

The brake rotor has a certain moment of inertia and can also adjust the moment of inertia.
Prevents accelerated fall by generating mechanical loss.

[0021] The normally powered solenoid of the second aspect of the present invention is such that the brake wheel periodically presses and sticks between the brake disc and the embra over the years.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIGS.

FIG. 1 is an external view of the present invention.

FIG. 2 is a sectional view of the emergency brake section.

FIG. 3 is a circuit diagram of the present invention.

First, the normal operation will be described.

The brake spring 4 of the brake section is connected to the brake wheel 1 via the brake lever 3 and the brake disc 2.
Is pressed against the embra 15, and the brake rotor 11 is stopped.

The brake is always engaged.

The motor is rotated forward and backward to wind up and down, and at the same time, the clutch 14 is turned on and off to connect and disconnect the brake portion.

In practice, the clutch 14 acts as a brake.

In this case, the brake wheel 1, the brake rotor 11, the gear 12, the clutch gear 13 and the like on the side of the brake section hardly rotate.

Next, operation during a power failure will be described.

At the time of power failure, both the clutch 14 and the brake 16 are in an operating (connected) state.

The brake 16 is released to drop the load.

By pressing the (non) 26 push button, D
The C solenoid 10 attracts and turns the brake lever B7 so that the brake rod 5 causes the brake spring 4 to rotate.
The brake disc 2 loses the pushing force by overcoming and pulling back. Therefore, the brake torque becomes 0.

Due to the load torque applied to the drum by the load, the rotating objects such as the drum, the gear (not shown), the rotor 17, the clutch gear 13, the gear 12, the brake rotor 11 and the brake wheel 1 gradually start to rotate. Begins to fall.

The clutch gear 13, the gear 12, the brake rotor 11, the brake wheel 1 and the like, which rotate only during an abnormality (during a power failure), become a resistance to rotation (a mechanical loss that delays acceleration of rotation).

The moment of inertia is changed by adjusting the weight of the brake rotor 11 (changing the diameter and thickness).

That is, since the moment of inertia of the rotating body is increased or adjusted, it does not accelerate suddenly but continues to fall slowly.

If the distance is short, it can be dropped at a substantially constant speed.

A slight difference occurs depending on the size of the load.

The circuit for performing these operations is shown in FIG.
Described in.

The operation is performed by a normal push button switch for operation.

Button (non-enter) 24, (non-off) 25,
(Non) 26 is prepared for emergency.

The emergency power source is a small DC battery 19 which is relatively familiar to automobiles, motorcycles, etc.
Use about 48V.

During normal operation, the button (ON) 22 is pressed. The lamp (RL) 21 is turned on. (ON) 28 is a relay for switching between normal and abnormal conditions.

(MM) 29 is a relay for controlling the DC solenoid.

Further, a button (non-entry) 24 is inserted.

(Non-entry) -entry a- (non)-(MM) is an open circuit, and (MM) 29 is OFF.

As a result, the (MM) a- (BM2) circuit is open, and the (BM2) 10a is OFF.

(Non) -On a- (GL) -is open circuit, and (GL) 27 is off.

In the normal state, even if (non) 26 is inserted, the state is
does not change.

In the abnormal state, the power is turned off in the above-mentioned state, so that the (RL) 21 is turned off. Naturally (upper)-(north)
Can't drive.

The (GL) 27 lights up, which indicates that there is a power failure.

When the load needs to be unloaded, the (non) button 26 is pushed while paying attention to the surroundings.

(Non-entry) -entry a- (non)-(MM) is closed, and (MM) 29 is turned on.

As a result, the (MM) a- (BM2) circuit is closed and the (BM2) 10a is turned on, and the DC solenoid 1
0 sucks. After that, the dropping operation is performed.

The DC battery 19 needs to be regularly inspected, charged and replaced.

For daily battery inspection, in the state of (OFF) 23, insert (NON) 24 and confirm by lighting (GL) 27 (If it is off, the battery is insufficient.) Examples are shown in FIGS. 7 and 8.

The brake wheel 1 has been pressed between the brake disc 2 and the embra 15 for many years except in an emergency.

It is conceivable that the product may become sticky over a long period of time and may not come off in an emergency.

A solenoid that operates on a normal power source (hereinafter referred to as an AC solenoid) is installed in parallel, and an AC is periodically used.
The brake is tested by operating (suctioning) the solenoid 18.

As shown in FIG. 8, a (test) button 30 is attached to the operation button switch to operate the brake.

Although an external view of the operation button switch is omitted, a (test) button is added between the (North) and (Non) buttons in the external view shown in FIG.

(R) 31 is a relay for controlling the AC solenoid 18.

When the (Test) button 30 is pressed, (R) 3
1 turns on.

As a result, the (BM3) 18a is turned on, the AC solenoid 18 is operated, and the brake is released.

The connecting portion between the brake rod 5 and the manual brake lever 7 has a half-moon shape so that the brake lever 5 is not affected even if the brake rod 5 is moved from the AC solenoid 18 side. (The manual brake lever 7 and the DC solenoid 10 have no effect even if they are pulled from the AC solenoid 18 side).

[0069]

According to the present invention, an abnormal state at the time of power failure can be recognized by the lamp display of the operation button switch.

By operating the operation button switch, the load can be quickly lowered (dropped) safely (at a constant speed).

In the event of a power failure, there is no need to urgently climb to a high place or urgently prepare a scaffold, and since it can be done quickly, it is possible to eliminate defective products.

It is possible to eliminate the risk of fire when the high-temperature heating object is hung. It has the effects of being able to respond quickly in an emergency, having excellent safety, being able to reduce product defects, and being economical with low equipment maintenance costs.

The brake releasing device can be improved in performance by installing it in parallel with the solenoid that is operated by the normal power source.

[Brief description of drawings]

FIG. 1 is an external view of the present invention.

FIG. 2 is a cross-sectional view of an emergency brake unit according to the present invention.

FIG. 3 is a circuit diagram of the present invention.

FIG. 4 is an external view of an operation button switch of the present invention.

FIG. 5 is an external view of a conventional type.

FIG. 6 is a sectional view of a conventional brake unit.

FIG. 7 is a cross-sectional view of the emergency braking portion of the present invention (explaining claim 2).

FIG. 8 is a circuit diagram of the present invention (explaining claim 2).

[Explanation of symbols]

1 ... Brake wheel, 2 ... Brake disc, 3 ... Brake lever, 4 ... Brake spring, 5 ... Brake rod,
7 ... Manual brake lever, 10 ... DC solenoid, 1
0a ... DC solenoid coil, 11 ... Brake rotor, 12 ... Gear, 13 ... Clutch gear, 14 ... Clutch part, 15 ... Embra, 16 ... Brake, 17 ... Rotor, 18 ... AC solenoid, 18a ... AC solenoid coil, a ... Brake lever B semicircular shape, 19 ... DC battery, 21 ... Lamp RL, 22 ... Button (on), 2
3 ... button (off), 24 ... button (non-entry), 25 ... button (non-off), 26 ... button (non), 27 ... lamp GL,
28 ... relay (ON), 29 ... relay (MM), 30 ... button (test).

Claims (2)

[Claims] 1. A power supply comprising a speed reducer, a drum, a wire rope, a clutch, a brake rotor, a brake, a DC battery, and an operation button switch with a status display. When a power failure occurs, a DC battery power source is operated by operating the operation button switch from the ground. An electric hoist with an emergency brake release device characterized by unloading the luggage at a nearly constant speed with mechanical loss such as a brake rotor that can release the braking force and adjust the moment of inertia. 2. An electric hoist with an emergency brake release device, wherein the brake release device that operates even with a normal power source is added to claim 1.