Speed detection device and passenger conveyer device

Patent metadata

Field	Value
Publication number	US-11078050-B2
Application number	US-201916283238-A
Country	US
Kind code	B2
Filing date	Feb 22, 2019
Priority date	Feb 23, 2018
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

A speed monitoring device and a passenger conveying device. The speed monitoring device includes a transmission rotor disposed on a shaft side surface of a shaft of which the speed is to be measured and rotating with rotation of the shaft of which the speed is to be measured; an encoder having an input shaft, the input shaft of the encoder being connected to the transmission rotor and rotating with rotation of the transmission rotor; and a mounting bracket for securing the transmission rotor and the encoder to a position where they are to be mounted.

First claim

What is claimed is:

1. A speed monitoring device comprising:
a transmission rotor disposed on a shaft side surface of a shaft of which the speed is to be measured and rotating with rotation of the shaft of which the speed is to be measured;
an encoder having an input shaft, the input shaft of the encoder being connected to the transmission rotor and rotating with rotation of the transmission rotor;
a mounting bracket for securing the transmission rotor and the encoder to a position where they are to be mounted;
a friction increasing portion disposed around the shaft of which the speed is to be measured and having an outer circumferential surface that is engaged with the transmission rotor.

2. The speed monitoring device according to claim 1 , further comprising a positioning portion disposed at a connection position of the input shaft of the encoder and the transmission rotor, for preventing a relative movement between the encoder and the transmission rotor.

3. The speed monitoring device according to claim 1 , wherein the transmission rotor has an outer circumferential surface made of polyurethane and/or a rotor body made of a nylon material.

4. The speed monitoring device according to claim 3 , wherein the outer circumferential surface of the transmission rotor is integrally formed with the rotor body.

5. The speed monitoring device according to claim 3 , wherein a reinforcing rib is further disposed on a sidewall of the rotor body.

6. The speed monitoring device according to claim 1 , wherein a static friction coefficient of the outer circumferential surface of the friction increasing portion is larger than a static friction coefficient of the outer circumferential surface of the shaft of which the speed is to be measured.

7. The speed monitoring device according to claim 6 , wherein the friction increasing portion comprises a retaining ring that is disposed around the shaft of which the speed is to be measured and remains relatively stationary with respect to the shaft of which the speed is to be measured during operation.

8. The speed monitoring device according to claim 7 , wherein the retaining ring comprises a plurality of retaining segments engaged to one another.

9. The speed monitoring device according to claim 8 , wherein each of the plurality of retaining segments has an inclined end surface, and the inclined end surfaces of adjacent retaining segments are engaged with each other.

10. The speed monitoring device according to claim 8 , further comprising
a plurality of sets of stepped shafts, each having a first stepped segment and a second stepped segment;
a plurality of sets of positioning members; and
mounting holes respectively disposed on sidewalls of adjacent retaining segments near ends;
wherein in a mounted state, the first stepped segment is engaged with the mounting hole of the retaining segment; the second stepped segment passes through the mounting hole, and the second stepped segment is provided with a fastening hole; the positioning member in each set fastens an adjacent stepped shaft through the fastening hole in the second stepped segment.

11. The speed monitoring device according to claim 7 , wherein a convex portion is provided on an inner circumferential surface of the retaining ring, and the retaining ring is in an interference fit with the shaft of which the speed is to be measured through the convex portion.

12. The speed monitoring device according to claim 11 , wherein the convex portion is constructed as a strip-shaped boss.

13. The speed monitoring device according to claim 1 , further comprising a pressure bearing bracket, wherein the transmission rotor and the encoder are fixed to the pressure bearing bracket through the mounting bracket;
and in an operation state, the pressure bearing bracket is used for providing pressure from the transmission rotor toward the shaft of which the speed is to be measured.

14. The speed monitoring device according to claim 13 , wherein the pressure bearing bracket comprises: a torque fulcrum, an elastic member located on a first side of the torque fulcrum, and a second side opposite to the first side; wherein the transmission rotor and the encoder are connected through the mounting bracket to the pressure bearing bracket at the second side of the torque fulcrum; and the elastic member acts as a source of pressure that presses the transmission rotor against the shaft of which the speed is to be measured.

15. The speed monitoring device according to claim 14 , further comprising an elastic force control portion coupled to the elastic member and configured to control a degree of compression of the elastic member.

16. The speed monitoring device according to claim 13 , wherein the transmission rotor and the pressure bearing bracket are disposed on an upper side or a lower side of the shaft of which the speed is to be measured.

17. The speed monitoring device according to claim 13 , wherein a line connecting circle centers of the transmission rotor and the shaft of which the speed is to be measured is at an angle of 45°-90° with respect to a horizontal plane.

18. The speed monitoring device according to claim 13 , further comprising a shroud; wherein the shroud is disposed on a side of the pressure bearing bracket and the transmission rotor away from the shaft of which the speed is to be measured.

19. A passenger conveying device comprising the speed monitoring device according to claim 1 , wherein the speed monitoring device is disposed on a shaft side surface of a main drive shaft.

20. A speed monitoring device comprising:
a transmission rotor disposed on a shaft side surface of a shaft of which the speed is to be measured and rotating with rotation of the shaft of which the speed is to be measured;
an encoder having an input shaft, the input shaft of the encoder being connected to the transmission rotor and rotating with rotation of the transmission rotor;
a mounting bracket for securing the transmission rotor and the encoder to a position where they are to be mounted;
a positioning portion disposed at a connection position of the input shaft of the encoder and the transmission rotor, for preventing a relative movement between the encoder and the transmission rotor;
wherein the transmission rotor has a stepped mounting hole, and the positioning portion comprises an elastic plug; wherein a first side of the stepped mounting hole is engaged with the input shaft of the encoder, and the elastic plug is engaged with a second side of the stepped mounting hole and the input shaft of the encoder.

21. The speed monitoring device according to claim 20 , wherein the elastic plug is constructed to have a frustoconical body and is provided on a sidewall thereof with a receiving region for providing space for elastic deformation; wherein in a mounted state, one end of the elastic plug having a smaller diameter is toward the stepped mounting hole.

22. A speed monitoring device, characterized by comprising:
a transmission rotor disposed on a shaft side surface of a shaft of which the speed is to be measured and rotating with rotation of the shaft of which the speed is to be measured;
an encoder having an input shaft, the input shaft of the encoder being connected to the transmission rotor and rotating with rotation of the transmission rotor;
a mounting bracket for securing the transmission rotor and the encoder to a position where they are to be mounted;
a pressure bearing bracket, wherein the transmission rotor

Assignees

• Otis Elevator Co

Inventors

• Cheng Lifei
• Hu Zhaoxia

Classifications

• B66B27/00 Primary

  Indicating operating conditions of escalators or moving walkways (of general application G08) · CPC title

• B66B23/02 Primary

  Driving gear · CPC title

• B66B29/00

  Safety devices of escalators or moving walkways (walkways of variable speed type B66B21/12; handrails of variable speed type B66B23/26) · CPC title

• B66B5/00

  Applications of checking, fault-correcting, or safety devices in elevators · CPC title

• G01P3/02

  Devices characterised by the use of mechanical means · CPC title