JPS5842391Y2 - electric chain block - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an electric chain block.

In conventional overload prevention devices using friction plates and elastic bodies, the tightening of the spring was adjusted using an adjustment nut so that it would not slip under the rated load.

This had the disadvantage that slippage occurred under loads that did not exceed the rated load due to wear of the friction plates.

Also, at this time, the motor continued to reverse rotation at 11.

The purpose of this invention is to provide an electric chain block that restricts the rotation of the motor when the load exceeds the rated load.

As shown in the figure, the electric chain block A includes a motor 1, a pinion shaft 3 to which rotation is transmitted from the output shaft 2 of the motor 1, and is driven from the pinion shaft 3 via a group of four transmission gears. Installed load sheave 5
and the load 6 passed over the load sheave 5.

A spline shaft 7 is provided on the tip side of the pinion shaft 3, and a spline hole 9 of a cone-shaped rotating body 8 is fitted into the spline shaft 7, and a friction member 10 is provided on the outer periphery of the rotating body 8. put.

Further, in the electric chain block A, a stationary cylindrical body 11 is provided which comes into contact with a friction member 10 to stop the rotation of the rotary body 80 when the rotary body 8 advances toward the distal end side of the pinion shaft 3. .

A screw hole 12 is provided inwardly from the distal end surface of the rotating body 8 and is threaded in a direction opposite to the winding direction, which is on the same line as the spline hole 9. A male screw 13 threaded in the same direction as the tapped hole 12 provided at the end of the screw is screwed in.

Further, a spring 14 that presses the rotating body 8 toward the output shaft 2 is fitted into the outside of the pinion shaft 3 .

In the figure, 15 is a ring fitted into the annular groove of the pinion shaft 2 so as to support the other end of the spring 14 whose one end is in contact with the rotating body 8, and 16 is a hanging hook.

Note that the pressing force of the spring 14 is set so as to prevent the rotating body 8 from moving forward toward the cylindrical body 11 when a load that does not exceed the rated load is hoisted up.

The electric chain lock according to this invention has the above-mentioned structure, and its use will be explained as follows: The electric chain lock according to the invention has the above-mentioned structure. There is a gap.

When the motor 1 is operated, when the motor 1 is hoisting at the rated load without being overloaded, the rotating body 8 is engaged with the spline 7 and the spline hole 9 by the screw hole 12 and the male thread 13. I try to move forward, but
At this time, the forward movement of the rotating body 8 is prevented by the spring 14,
The load sheave 5 is driven through the pinion shaft 3 and 4 groups of gears.

Therefore, the load 6 can be hoisted.

However, when the hoisting load exceeds the rated load, an overload is applied to the motor 1 side that transmits rotation to the pinion shaft 3.

Therefore, the rotating body 8 is compressed by the screw hole 9 and the male screw 13 screwed into the screw hole 9 while compressing the spring 14.
is moved forward, thereby bringing the friction member 10 of the rotary body 8 into pressure contact with the cylindrical body 11.

Therefore, the operation of motor 1 is restricted and stopped.

At this time, an overcurrent circuit breaker may be activated to stop the operation of the motor 1 due to the generated overcurrent.

Note that a hemp member may be provided on the cylindrical body side.

As described above, according to the electric chain lock according to this invention, when the hoisting load exceeds the rated load, the advancing rotating body presses the friction member of the rotating body against the cylindrical body, thereby stopping the rotation of the motor shaft. to bound.

For this reason, there is no winding up, preventing accidents, and
As soon as the motor is running properly, the rate at which the load increases becomes slow, and you can tell that the rated load is exceeded.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of an electric chain block according to this invention, and FIG. 2 is an enlarged longitudinal sectional front view showing the main parts of the same. A: Electric chain block, 1: Motor, 2: Output shaft, 3: Pinion shaft, 4: Transmission gear, 5...
Load sheave, 6...Load, 7...Spline shaft, 8...Rotating body, 9...Spline hole, 10...Friction Material, 11...
・Cylindrical body, 12... Screw hole, 13...
Male thread, 14... Spring.

Claims (1)

[Scope of utility model registration request] In an electric chain block that transmits the rotation of the motor to the load through a pinion shaft and a group of transmission gears, a cone-shaped rotating body that rotates together with the pinion shaft and can slide in the axial direction is provided at the end of the pinion shaft. A stationary cylindrical body is provided outside the rotary body, a friction member is provided on either the inner periphery of the cylindrical body or the outer periphery of the rotary body, and a screw is attached to the output shaft of the motor in a direction opposite to the winding direction. A cut male threaded part is provided, and a threaded hole in the same direction as the male thread provided on the upper rotating body is screwed into this male threaded part. An electric chain block characterized by a rotating body pressed against the motor side by a spring.