Vibration monitor for rotating or moving equipment

• US 5,034,729 A
• Filed: 04/18/1990
• Issued: 07/23/1991
• Est. Priority Date: 04/18/1990
• Status: Expired due to Fees

• Current Assignee: Soft-Noze USA, Inc.
• Original Assignee: Lynn C. Lundquist
• Inventors: Lundquist, Lynn C.
• Primary Examiner(s): Swann, III, Glen R.
• Application Number:
  US07/510,511
• Time in Patent Office: 461 Days
• Field of Search: 340/683, 340/566, 340/429
• US Class Current: 340/683
• CPC Class Codes: G01H 11/02 by magnetic means, e.g. reluctance
• CPC Class Codes: G01P 13/00 Indicating or recording presence, absence, or direction, of movement electric switches H01H; counting moving objects G06M7/00
• CPC Class Codes: H01H 35/142 Damping means to avoid unwanted response
• CPC Class Codes: H01H 35/144 operated by vibration
• CPC Class Codes: H03K 17/952 using inductive coils

Abstract

This invention pertains to a device which is attached on rotating or moving equipment for the purpose of monitoring unsafe levels of equipment vibration. The invention comprises a mechanical assembly which is adjustably sensitive to the vibration amplitude of its given application. The monitor is so designed that it does not include the electronic switching device as an integral part of the invention. Rather, commercially available switching devices (proximity switches) are used as the electronic switching component. In the preferred embodiment, the unit is sensitive to vibration in any plane. The vibration monitor is a signaling device; it can be used to sound an external alarm, engage safety equipment, or disengage or stop moving equipment. It was developed as an inexpensive, rugged, device which can be used in conjunction with general purpose proximity switches to give vibration monitoring capability to an existing proximity switch product line.

Claims

1. A vibration monitoring means comprising:

(a) an inertial mass which is caused to move responsive to vibration; and

(b) a proximity switch which is activated by an entrance of said inertial mass into a pre-determined sensing range of said proximity switch.

2. The vibration monitor of claim 1 further including a biasing means to fix the initial position and dampen the oscillation of said inertial mass wherein said biasing means is comprised of a permanent magnet adjustably located in a sleeve.

3. The vibration monitor of claim 1 further including a biasing means to fix the intial position and dampen the oscillation of said inertial mass wherein said biasing means is comprised of a permanent magnet with a magnet shield.

4. The vibration monitor of claim 1 further including a biasing means to fix the initial position and dampen the oscillation of said inertial mass wherein said biasing means is comprised of a wire spring adjustably bearing on the inertial mass through the means of a fulcrum pin.

5. The vibration monitor of claim 1 further including a biasing means to fix the initial position and dampen the oscillation of said inertial mass wherein said biasing means is comprised of a dampening bar adjustably bearing on the inertial mass through the means of a dampening spring.

6. The vibration monitor of claim 1 further including a biasing means to fix the initial position and dampen the oscillation of said inertial mass wherein said biasing means is comprised of a dampening coil spring adjustably retaining a pendulum.

7. The vibration monitor of claim 1 further including a biasing means to fix the initial position and dampen the oscillation of said inertial mass wherein said biasing means is comprised of a fixed sensitivity flat spring.

8. The vibration monitor of claim 1 further including a testing means to move the inertial mass into the sensing range of the proximity switch whereby the vibration monitor proper, and related circuits, may be verified comprising a slidable test button and magnet sleeve.

9. The vibration monitor of claim 1 further including a testing means to move the inertial mass into the sensing range of the proximity switch whereby the vibration monitor proper, and related circuits, may be verified comprising a non-magnetic test button.

10. The vibration monitor of claim 1 further including a testing means to move the inertial mass into the sensing range of the proximity switch whereby the vibration monitor proper, and related circuits, may be verified comprising a test button with an attached shielded and movable magnet.

11. The vibration monitor of claim 1 further including a testing means to move the inertial mass into the sensing range of the proximity switch whereby the vibration monitor proper, and related circuits, may be verified comprising a sleeve which moves over a fixed coil spring to move a pendulum.

12. The vibration monitor of claim 1 wherein a housing is incorporated which comprises:

(a) a longitudinally open portion within said housing;

(b) a threaded opening at right angles to said open portion for said proximity switch; and

(c) an opening in opposition to said threaded opening portion for a biasing magnet or test button assembly.

13. The vibration monitor of claim 1 wherein said inertial mass comprises a rotatably mounted assembly centered in a locating socket affixed to a spring device so mounted that displacement in either a plane parallel to, or a plane perpendicular to, said spring device causes said assembly to enter the sensitivity range of said proximity switch of claim 1.

14. The vibration monitor of claim 1 wherein said inertial mass comprises an inertial mass rigidly mounted to a spring device so that displacement in a plane perpendicular to said spring device causes said assembly to enter the sensitivity range of the proximity switch of claim 1.

15. The spring device for the inertial mass of claim 13 or 14 wherein said spring device is configured as a flat spring.

16. The spring device for the inertial mass of claim 15 wherein a fixed fulcrum disc locating socket is integral with said spring member.

17. The spring device for the inertial mass of claim 13 or 14 wherein said spring device is configured as a compound flat spring.

18. The spring device for the inertial mass of claim 17 wherein a fixed fulcrum disk locating socket is integral with said spring member.

19. The vibration monitor of claim 1 wherein said inertial mass comprises a pendulum suspendably mounted to a multiplicity of spring devices so that displacement in a plane perpendicular to said spring devices causes said pendulum to enter the sensitivity range of the proximity switch of claim 1.

20. The vibration monitor of claim 1 wherein said inertial mass comprises a rotatably mounted assembly suspendably mounted between a multiplicity of spring devices so that displacement in either a plane parallel to, or a plane perpendicular to, said spring devices causes said assembly to enter the sensitivity range of the proximity switch of claim 1.

21. The spring device for the inertial mass of claim 19 or 20 wherein said spring device is configured as an opposing pair of coil springs.