GB2237616A - Fluid dampers - Google Patents

Fluid dampers Download PDF

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Publication number
GB2237616A
GB2237616A GB8924163A GB8924163A GB2237616A GB 2237616 A GB2237616 A GB 2237616A GB 8924163 A GB8924163 A GB 8924163A GB 8924163 A GB8924163 A GB 8924163A GB 2237616 A GB2237616 A GB 2237616A
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GB
United Kingdom
Prior art keywords
tank
arrangement
tanks
side surround
liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8924163A
Other versions
GB8924163D0 (en
Inventor
William Egerton Marsden
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB8924163A priority Critical patent/GB2237616A/en
Publication of GB8924163D0 publication Critical patent/GB8924163D0/en
Publication of GB2237616A publication Critical patent/GB2237616A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
    • F16F9/103—Devices with one or more members moving linearly to and fro in chambers, any throttling effect being immaterial, i.e. damping by viscous shear effect only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G13/00—Weighing apparatus with automatic feed or discharge for weighing-out batches of material
    • G01G13/003—Details; specially adapted accessories

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Cultivation Receptacles Or Flower-Pots, Or Pots For Seedlings (AREA)

Abstract

A position stabilising and damping arrangement is for use with a suspended body ie. a weigh hopper (10). The arrangement includes two damping devices (12). Each device (12) comprises a first tank (14) located within a second tank (16) containing a liquid, namely oil. The first tank (14) has a top (18), a side surround (20) and a bottom (26) in which one or more apertures (24) are provided for passage of liquid. The second tank (16) has a bottom (26), a side surround (28) and an open top through which the first tank (14) passes. The second tanks (16) are each supported on a stationary frame (30) with the first tanks (14) each being carried on a respective arm (32) projecting from said hopper (10). In a modification (Figs 5, 6) the first and second tanks each have one or more baffle walls (38, 40) which are interleaved to provide a labyrinth arrangement. <IMAGE>

Description

POSITION ST.R3ILISIN AND DAMPING ARiAgaEIENTS .
This invention relates to a position stabilising and damping arrangement primarily, but not necessarily, for use with a weigh hopper supported through suspension means, particularly but not essentially load cells, from a stationary structure.
A problem with weigh hoppers is that when material is fed thereinto to be held thereiii during a weighing operation the hopper moves, however is required to be stabilised for such operation to give acurate readings of the weight.
An object of the present invention is to provide means to stabilise a weigh hopper in a manner to obviate or mitigate the problem.
Accordingly, the present invention is a position stabilising and damping arrangement for use with a suspended body, the arrangement including at least two damping devices, each device comprising a first tank located within a second tank containing a liquid, the first tank having a top, a side surround and a bottom in which one or more apertures are provided for passage of liquid with the second tank having a bottom, a side surround and an open top through which the first tank passes, the second tanks each being supported on a stationary frame with the first tanks each being carried on a respective arin projecting from said body.
Preferably, the tanks are of similar concentric shape, desirably of rectangular horizontal crosssection. Two devices are preferably provideS with their first tanks carried on respective arms projecting from opposite locations on said body.
Tne liquid is preferably oil. The first tank of each device may preferably have one or laore baffle walls, similar in shape to te side surround and sequentially spaced inwardly from the side surround, an the corresponding second tank of the device may be provided with one or more baffle walls with the side surround and baffle wall(s) of the first tank being sequentially spaced inwardly of the corresponding side surround and baffle wall(s) of the second tank.
Desirably, one additional baffle wall is provided in each second tans than in each first tank with the bottom of the first tank being supported on a central spindle with its edyes spaced from said additional baffle wall of the second tank.
An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which; Fig. 1 is a plan view of a weigh hopper having two position stabilising and damping arrangements according to the present invention mounted thereon; Fig. 2 is a side view; Fiy. 3 is a front view; Fig. 4 is a vertical cross-sectional view of an arrangement to an enlarged scale; Fig. 5 is a vertical cross-sectional view of a modified arrangement to the same scale as Fig. 4; and Fig. 6 is a horizontal cross-sectional view on the line VI-VI of Fig. 5.
Referring to the drawings, a position stabilising and daitping arrangement is for use with a suspended body, in this elabodiment a weigh hopper 10. The arrangement includes two similar damping devices 12.
sach device 12 comprises a first tank 14 located within a second tank 16 which contains a liquid, desirably oil.
The first tank 14 has a top 1S, a side surround 20 and a bottom 22 in which one or more [two in this embodiment) apertures in the form of slots 24 are provided for passage of liquid. The second tank 16 has a bottom 26, a side surround 2.3 and an open top through which the first tank 14 passes. The second tanks 16 are each supported on a separate stationary frame 30. The first tanks 14 are carried on a respective arm 32 projecting from opposite locations of said hopper 10. The hopper 10 is supported by load cells 34 from a stationary structure represented by beams 36.
The tanks 14, 16 are of similar concentric shape, in this embodiment of rectangular horizontal crosssection as shown.
In use, when material is fed into the nopper 13 and held therein to be weighed, the hopper 13 moves due to its movable suspension means, however tne arrangements dampen the moveents and stabilise the hopper 13.
In a modification as shown in Figs. 5 and o, the first tank 14 of each device has one or more baffle walls 38 one in this modification and as snown in the drawings, similar in shape to the side surround 20 and sequentially spaced inwardly from tne side surround 23, and the corresponding second tank 16 of the device is provided with one or more baffle walls 43 (two in tis modification) with the side surround 23 and baffle walls 33 of the first tank 14 being sequentially spaced inwardly of the corresponding side surround 23 and baffle walls 40 of the second tank 16. In this modification, one additional baffle wall 40 is provided in the second tank 16 than in the first tank 14 with the bottom 22 of the first tank 14 being supported on a central spindle 42 rooted to the top 13 with the edges of the bottom 22 spaced from said additional baffle wall 40 of the second tank 16. The spindle 42 is provided with gusset webs 44 between itself and the bottom 22 and between itself and the top 13. This modification provides the arrangements with greater stability than those of the embodiment.

Claims (10)

CI.,AIMS:
1. A position stabilising and damping arrangement for use with a suspended body, the arrangement including at least two damping devices, each device comprising a first tank located within a second tank containing a liquid, the first tank having a top, a side surround and a bottom in which one or more apertures are provided for passage of liquid with the second tank having a bottom, a side surround and an open top through which the first tank passes, the second tanks each being supported on a stationary frame with the first tanks each being carried on a respective arm projecting from said body.
2. An arrangement as claimed in Claim 1, wherein the tanks are of similar concentric shape.
3. An arrangement as claimed in Claim 2, wherein the tanks are of rectangular horizontal cross-section.
4. An arrangement as claimed in Claim 1, 2 or 3, wherein two devices are provided with their first tanks carried on respective arms projecting from opposite locations on said body.
5. An arrangement as claimed in Claim 1, 2, 3 or 4, wherein the liquid is oil.
6. An arrangement as claimed in any one of Claims 1, 2, 3, 4 or 5, wherein the first tank of each device has one or more baffle walls, similar in shape to the side surround and sequentially spaced inwardly from the side surround.
7. An arrangement as claimed in Claim 6, wherein the corresponding second tank of the device is provided with one or more baffle walls with the side surround and baffle wall(s) of the first tank being sequentially spaced inwardly of the corresponding side surround and baffle wall(s) of the second tank.
8. An arrangement as claimed in Claim 7, wherein one additional baffle wall is provided in each second tank than in each first tank.
9. An arrangement as claimed in Claim 8, wherein the bottom of the first tank is supported on a central spindle with its edges spaced from said additional baffle wall of the second tank.
10. An arrangement substantially as hereinbefore described with reference to Figs. 1 to 4 of the accompanying drawings.
11 . An arrangement substantially as hereinbefore described with reference to Figs. 5 and 6 of the accompanying drawings.
GB8924163A 1989-10-26 1989-10-26 Fluid dampers Withdrawn GB2237616A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8924163A GB2237616A (en) 1989-10-26 1989-10-26 Fluid dampers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8924163A GB2237616A (en) 1989-10-26 1989-10-26 Fluid dampers

Publications (2)

Publication Number Publication Date
GB8924163D0 GB8924163D0 (en) 1989-12-13
GB2237616A true GB2237616A (en) 1991-05-08

Family

ID=10665228

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8924163A Withdrawn GB2237616A (en) 1989-10-26 1989-10-26 Fluid dampers

Country Status (1)

Country Link
GB (1) GB2237616A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB648931A (en) * 1948-04-13 1951-01-17 British Messier Ltd Improvements in or relating to aircraft and like shock absorbers
US4648577A (en) * 1984-06-27 1987-03-10 Gerb Gesellschaft Fur Isolierung Mbh & Co., Kg Viscous damper having a conical plunger tube

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB648931A (en) * 1948-04-13 1951-01-17 British Messier Ltd Improvements in or relating to aircraft and like shock absorbers
US4648577A (en) * 1984-06-27 1987-03-10 Gerb Gesellschaft Fur Isolierung Mbh & Co., Kg Viscous damper having a conical plunger tube

Also Published As

Publication number Publication date
GB8924163D0 (en) 1989-12-13

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)