Electric lifting apparatus and roll press machine

Patent metadata

Field	Value
Publication number	US-11612924-B2
Application number	US-201917041347-A
Country	US
Kind code	B2
Filing date	Mar 1, 2019
Priority date	Mar 28, 2018
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

A lifting apparatus of the present invention includes: a ball screw; a frame configured to support bearings for the ball screw; an electric motor supported by the frame and having an output shaft being rotatable; and a rotational force transferring mechanism configured to transfer a rotational force of the output shaft as a rotational force of a threaded shaft of the ball screw. A first moving body providing a first sliding surface inclined at a predetermined angle with respect to a plane including a direction of an axis is fixed to a nut of the ball screw. A second moving body is arranged to be movable linearly in a direction perpendicular to the direction of the axis with respect to the frame, has a second sliding surface configured to be slidably movable with respect to the first sliding surface, and is caused to move linearly in the direction perpendicular to the direction of the axis by a slidably movement between the first sliding surface and the second sliding surface when the nut and the first moving body moves linearly in the direction of the axis. The threaded shaft extends through the first moving body in the direction of the axis, and the pair of bearings is arranged on both sides of the first moving body.

First claim

What is claimed is:

1. A roll press machine comprising:
(a) an electric lifting apparatus comprising:
a ball screw including a threaded shaft having an axis,
a pair of bearings configured to support the threaded shaft in such a manner that the threaded shaft is rotatable around the axis,
a nut threadedly engaged with the threaded shaft via a plurality of rolling elements in such a manner that the nut moves linearly in a direction of the axis when the threaded shaft rotates,
a frame configured to support the pair of bearings,
an electric servo motor supported by the frame and having an output shaft being rotatable, wherein the output shaft of the electric servo motor and the axis of the threaded shaft are parallel to each other,
a rotational force transferring mechanism configured to transfer a rotational force of the output shaft to a rotational force of the threaded shaft, wherein the rotational force transferring mechanism has a belt which is laid over the output shaft and the threaded shaft,
a first moving body fixed to the nut and providing a first sliding surface inclined at a predetermined angle with respect to a plane including the direction of the axis, and
a second moving body arranged to be movable linearly in a vertical direction perpendicular to the direction of the axis with respect to the frame, the second moving body having a second sliding surface configured to be slidably movable with respect to the first sliding surface,
wherein the second moving body is caused to move linearly in the vertical direction by a sliding movement between the first sliding surface and the second sliding surface when the nut and the first moving body move linearly in a horizontal direction parallel to the axis,
the threaded shaft extends through the first moving body in the direction of the axis, and
the pair of bearings is arranged, respectively, on both sides of the first moving body;

(b) first and second side rolls arranged in parallel to each other, wherein the first side roll is arranged stational, and the second side roll is arranged movable toward the first side roll to press itself against the first side roll by operation of the electric lifting apparatus;
(c) a link member arranged between the second side roll and the second moving body of the electric lifting apparatus to transmit the vertical movement of the second moving body to the second side roll, wherein the link member includes a load cell for measuring a load applied by the second side roll against the first side roll;
(d) a roll frame configured to support the first and second side rolls for rotation, wherein the roll frame extends downward below the first and second side rolls to surround at least part of the electric lifting apparatus, and
(e) a controlling device connected to the electric servomotor and the load cell, the controlling device being configured to carry out a feedback control of the electric servo motor based on an applied load measured by the load cell and one of a target load value or a target load range,
wherein two pairs of the first sliding surface and the second sliding surface are provided, wherein the first sliding surface and the second sliding surface are slidably movable to each other in each pair, and
the two pairs of the first sliding surface and the second sliding surface are arranged on both sides with respect to the threaded shaft and at predetermined distances from the threaded shaft in a direction perpendicular to both the direction of the axis and the direction in which the second moving body is linearly movable.

2. The roll press machine according to claim 1 , wherein as seen in the direction in which the second moving body is linearly movable, the output shaft of the electric servomotor and the axis of the threaded shaft are partially overlapped with each other.

3. The roll press machine according to claim 1 , wherein
the threaded shaft has a protruded part which extends outward through one of the pair of bearings, and
the belt is laid over the protruded part of the threaded shaft.

4. The roll press machine according to claim 1 , wherein
the frame is provided with a first sliding guide which extends in parallel with the direction of the axis, and
the first moving body is provided with a first sliding part which is slidably movable relative to the first sliding guide.

5. The roll press machine according to claim 4 , wherein
two pairs of the first sliding guide and the first sliding part are provided, wherein the first sliding guide and the first sliding part are slidably movable to each other in each pair, and
the two pairs of the first sliding guide and the first sliding part are arranged on both sides with respect to the threaded shaft and at predetermined distances from the threaded shaft in a direction perpendicular to both the direction of the axis and the direction in which the second moving body is linearly movable.

6. The roll press machine according to claim 4 , wherein
the frame is provided with a second sliding guide which extends perpendicularly to the direction of the axis, and
the second moving body is provided with a second sliding part which is slidably movable relative to the second sliding guide.

7. The roll press machine according to claim 1 , wherein the predetermined angle is within a range of 5.7 degrees to 11.3 degrees.

8. The roll press machine according to claim 1 , further comprising:
a second side roll supporting part supported by the second moving body, the second side roll being supported by the second side roll supporting part in such a manner that the second side roll is rotatable; and
a first side roll supporting part configured to support the first side roll in such a manner that the first side roll is rotatable,
wherein the roll frame is configured to fix the first side roll supporting part to a base.

9. The roll press machine according to claim 8 , wherein
the roll frame is provided with a third sliding guide which extends perpendicularly to the direction of the axis, and
the second side roll supporting part is provided with a third sliding part which is slidably movable relative to the third sliding guide.

10. The roll press machine according to claim 8 , further comprising
one or more displacement sensors configured to measure a local displacement at a predetermined position of at least one of the first or second side rolls, and
a displacement sensor frame configured to fix the one or more displacement sensors to the base, the displacement sensor frame being a separate frame from the roll frame.

11. The roll press machine according to claim 8 , wherein the load cell is provided between the second side roll supporting part and the second moving body.

12. The roll press machine according to claim 8 , wherein the roll frame is configured to fix the frame of the electric lifting apparatus to the base.

13. The roll press machine according to claim 1 , wherein the output shaft of the electric servomotor and the axis of the threaded shaft are aligned in straight line.

14. The roll press machine according to claim 13 , wherein
the frame of the electric lifting apparatus is provided with a first sliding guide which extends in parallel with the direction of the axis,
the first moving body is provided with a first sliding part which is slidably movable relative to the first sliding guide,
the frame of the electric lifting apparatus is provided with a second sliding guide which extends perpendicularly to the direction of the axis,
the second moving body is provided with a second sliding part which is slidably movable relative to the second sliding guide,
a pair

Assignees

• Sintokogio Ltd

Inventors

• Nakajima Shogo

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• B21B31/24

  by screws · CPC title

• B32B37/1054

  Regulating the dimensions of the laminate, e.g. by adjusting the nip or platen gap · CPC title

• B21C51/00 Primary

  Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F · CPC title

• B32B37/22

  involving the assembly of both discrete and continuous layers · CPC title