Vertical moving method, vertical moving apparatus, and vertical moving system

Patent metadata

Field	Value
Publication number	US-10858227-B2
Application number	US-201816026182-A
Country	US
Kind code	B2
Filing date	Jul 3, 2018
Priority date	Mar 29, 2016
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

A vertical moving method of a vertical moving unit on which a conveyance target object is mounted includes steps of causing a non-electric biasing unit to generate a biasing force to raise the vertical moving unit, causing an electric motor unit to generate a thrust in a direction to raise the vertical moving unit or a thrust in a direction to lower the vertical moving unit, and causing an electromagnetic brake unit to generate a braking force to resist a movement of the vertical moving unit. Independently of presence/absence of the object and a weight of the object, the thrust and/or the braking force is controlled such that the vertical moving unit stops when an external force of overload more than a predetermined value acts on the vertical moving unit during a vertical movement.

First claim

The invention claimed is:

1. A vertical moving method of a vertical moving unit on which a conveyance target object is mounted, comprising steps of:
causing a non-electric biasing unit to generate a biasing force to raise the vertical moving unit;
causing an electric motor unit to generate a thrust in a direction to raise the vertical moving unit or a thrust in a direction to lower the vertical moving unit; and
causing an electromagnetic brake unit to generate a braking force to resist a movement of the vertical moving unit,
wherein independently of presence/absence of the conveyance target object and a weight of the conveyance target object placed on the vertical moving unit, the thrust and/or the braking force is controlled such that the vertical moving unit stops when an external force of overload more than a predetermined value acts on the vertical moving unit during a vertical movement.

2. The vertical moving method according to claim 1 , wherein the electric motor unit comprises an electric motor, and a second electromagnetic brake different from the electromagnetic brake unit, and
when the vertical moving unit stops due to action of the external force, the electric motor is stopped, and rotation of an output shaft of the electric motor is braked by the second electromagnetic brake.

3. The vertical moving method according to claim 1 , wherein the external force is a force within a range of 50 N (inclusive) to 150 N (inclusive).

4. The vertical moving method according to claim 1 , wherein letting UF be the biasing force, DF be the thrust, BF be the braking force, W 1 be a weight of the vertical moving unit, W 2 be the weight of the conveyance target object, and F be the external force, when, as for values, a force in the direction to raise the vertical moving unit is defined as a positive value, and a force in the direction to lower the vertical moving unit is defined as a negative value,
DF−BF −{( W 1+ W 2)− UF}≤F

is satisfied.

5. The vertical moving method according to claim 1 , wherein the thrust by the electric motor unit is controlled to a constant thrust, and
the braking force by the electromagnetic brake unit is controlled in accordance with the presence/absence of the conveyance target object and the weight of the conveyance target object at the time of raising or lowering of the vertical moving unit.

Assignees

• Hirata Spinning

Inventors

• Matsumoto Bungo

Classifications

• B66F19/00

  Hoisting, lifting, hauling or pushing, not otherwise provided for · CPC title

• B66F7/02 Primary

  with platforms suspended from ropes, cables, or chains {or screws and movable along pillars} · CPC title

• B66F3/46

  Combinations of several jacks with means for interrelating lifting or lowering movements · CPC title

• B66F17/00

  Safety devices, e.g. for limiting or indicating lifting force · CPC title