GB2042743A - Chain Tensometer - Google Patents
Chain Tensometer Download PDFInfo
- Publication number
- GB2042743A GB2042743A GB7906314A GB7906314A GB2042743A GB 2042743 A GB2042743 A GB 2042743A GB 7906314 A GB7906314 A GB 7906314A GB 7906314 A GB7906314 A GB 7906314A GB 2042743 A GB2042743 A GB 2042743A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chain
- piston
- tensioner according
- chain tensioner
- cylinder arrangement
- 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- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
- G01L5/08—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using fluid means
Abstract
A chain tensometer consists of a piston-and-cylinder arrangement 2 to the piston component 14 of which is secured a chain 19 through the agency of attachment 17. The piston hydraulic pressure in chamber 16 is monitored by suitable means indicative of the tension in the chain 19. <IMAGE>
Description
SPECIFICATION
Chain Tensometer
This invention relates to chain tensometers.
In particular, although not essentially, the
present invention relates to chain tensometers for
measuring the tension of a stationary haulage
chain extending along a longwall face in an
underground mine, the chain providing an
anchored rack along which drivably engages a
drive sprocket on a mining machine to haul the
machine to and fro along the longwall face.
An object of the present invention is to
provide a chain tensometer which is sufficiently
robust to withstand the rigors encountered during
continuous underground use and which will give a
continuous indication of chain tension.
According to the present invention a chain tensometer comprises a support bracket adapted for attachment to an anchorage, a piston and cylinder arrangement comprising a cylinder
component and a piston component, one of the
components being fixedly secured to the support bracket and the other of the components being adapted for fixed attachment to a chain the tension of which is to be measured, both the components defining a through passage for the chain, and means enabling a force exerted
between the two components of the piston and cylinder arrangement to be sensed, in use the force being generated by the action of the tensioned chain.
Preferably, the piston and cylinder arrangement is hydraulic, the means enabling the hydraulic pressure to be sensed.
Preferably, the cylinder component comprises an open ended bush including a stepped through bore.
Advantageously, the bush is provided with a port constituting at least a part of the means enabling the hydraulic pressure within the piston and cylinder arrangement to be sensed.
Conveniently, a hydraulic pressure monitor is connected to the port.
Preferably, the piston component comprises a tubular piston rod.
Preferably, an outwardly extending flange is provided on the tubular piston rod.
Conveniently, attachment means are provided on the tubular piston rod for fixedly engaging the chain.
Alternatively, the piston and cylinder arrangement comprises resilient means acting between the piston component and the cylinder component.
Preferably, the means senses relative movement between the two components.
By way of example only, two embodiments of the present invention are described with reference to the accompanying drawings in which:
Figure 1 is an end view of a chain tensometer constructed in accordance with the present invention;
Figure 2 is a section along line Il-Il of Figure 1;and Figure 3 is an incomplete section similar to
Figure 2 but showing a second embodiment of chain tensometer.
Figures 1 and 2 of the drawings show the first embodiment of chaim tensometer to comprise a support bracket 1 having bolt holes 3 for securing the bracket to a head frame (not shown) of an armoured flexible conveyor extending along a longwall face of an underground mine. A hydraulic piston and cylinder arrangement 2 comprising an open ended cylinder component secured around one end to the support bracket by bolts 4 and a piston component slidably mounted within the cylinder component.
The cylinder component comprises a buch 5 including a through stepped bore 6 and two end caps 7 and 8 secured to the bush by bolts 9. A cross port 10 provides hydraulic access means to the piston and cylinder arrangement and in use a self sealing connector (not shown) is provided in the mouth of the port, the connector being connected to hydraulic pressure monitor means (not shown) for displaying and/or recording the pressure sensed within the piston and cylinder arrangement.
Seal assemblies 12 are provided within the stepped bore to prevent leakage of pressure fluid.
The piston component comprises a tubular piston rod 14 provided with an outwardly extending flange 1 5 defining a sealed chamber 1 6 for pressure fluid.
Attachment means 1 7 are provided for fixedly attaching a chain 1 9 to the piston component, in use the chain being arranged along the longwall face and providing a stationary rack along which a mining machine having a driven sprocket drivably engaging the chain, can haul itself.
In use, with the tensioned chain arranged along the longwall face and fixedly connected to the piston component by the attachment means 17, hydraulic fluid is introduced via the self sealing connector in the port 10 until the piston component is urged towards the end cap 8 by the fluid pressure in the sealed chamber 16, the piston component being urged to move against the action of chain tension.
The hydraulic feed is then removed from the piston and cylinder arrangement and replaced by the pressure sensing monitor Thus, when the machine starts to haul itself along the longwall face the tension in the haulage chain due to the action of the machine is measured by the monitor sensitive to the pressure in chamber 16, the pressure being proportional to the chain tension.
Figure 3 shows a second embodiment of chain tensometer in which the hydraulic piston and cylinder arrangement of the previously described embodiment is replaced by a piston and cylinder arrangement 20 comprising a piston component having a tubular piston rod 21 and an outwardly extending flange 22 slideable within a cylinder component comprising a bush 23 having a stepped bore 24. The piston component is urged along the cylinder component against the action of tension in a haulage chain 25 by resilient means 26 constituted by a plurality of pre-loaded disc springs, the chain 25 being fixedly secured to the piston component by attachment means 28.
Movement of the piston component along the cylinder due to the action of chain tension is sensed by a resiliently loaded plunger 30 of a linear potentiometer 31 arranged to derive a signal indicative of piston movement due to chain tension and hence indicative of chain tension, the derived signal being fed to monitor means (not shown).
In alternative embodiments the plunger 30 is marked with a scale enabling the chain tension to be read directly.
Claims (10)
1. A chain tensometer comprising a support bracket adapted for attachment to an anchorage, a piston and cylinder arrangement comprising a cylinder component and a piston component, one of the components being fixedly secured to the support bracket and the other of the components being adapted for fixed attachment to a chain the tension of which is to be measured, both the components defining a through passage for the chain, and means enabling a force exerted between the two components of the piston and cylinder arrangement to be sensed, in use the force being generated by the action of the tensioned chain.
2. A chain tensioner according to claim 1 in which the piston and cylinder arrangement is hydraulic, the means enabling the hydraulic pressure to be sensed.
3. A chain tensioner according to claim 2, in which the cylinder comprises an open ended bush including a stepped through bore.
4. A chain tensioner according to claim 3 in which the bush is provided with a port constituting at least a part of the means enabling the hydraulic pressure within the piston and cylinder arrangement to be sensed.
5. A chain tensioner according to claim 4 in which a hydraulic pressure monitor is connected to the port.
6. A chain tensioner according to any one of the preceding claims in which the piston component comprises a tubular piston rod provided with an outwardly extending flange.
7. A chain tensioner according to any one of the preceding claims in which attachment means are provided on the tubular piston for fixedly engaging the chain.
8. A chain tensioner according to claim 1 in which the piston and cylinder arrangement includes resilient means acting between the piston component and the cylinder component.
9. A chain tensioner according to claim 8 in which the means senses relative movement between the two components of the piston and cylinder arrangement.
10. A chain tensioner substantially as hereinbefore described with reference to Figures 1 and 2 or 3 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7906314A GB2042743A (en) | 1979-02-22 | 1979-02-22 | Chain Tensometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7906314A GB2042743A (en) | 1979-02-22 | 1979-02-22 | Chain Tensometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2042743A true GB2042743A (en) | 1980-09-24 |
Family
ID=10503367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7906314A Withdrawn GB2042743A (en) | 1979-02-22 | 1979-02-22 | Chain Tensometer |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2042743A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2183350A (en) * | 1985-10-26 | 1987-06-03 | Erlau Ag Eisen Drahtwerk | Device for checking overloading of chains |
| FR2732459A1 (en) * | 1995-03-27 | 1996-10-04 | Mannesmann Ag | DEVICE FOR MEASURING FRICTION FORCE TO BE SET BETWEEN TWO WORKPIECES |
| CN101692015B (en) * | 2009-09-05 | 2011-03-30 | 山西煤矿机械制造有限责任公司 | Device for measuring tension of scraper conveyer chain |
| WO2015157830A1 (en) * | 2014-03-26 | 2015-10-22 | BASTOS DE ARAUJO, Jairo | Equipment for determining traction in anchoring lines |
-
1979
- 1979-02-22 GB GB7906314A patent/GB2042743A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2183350A (en) * | 1985-10-26 | 1987-06-03 | Erlau Ag Eisen Drahtwerk | Device for checking overloading of chains |
| GB2183350B (en) * | 1985-10-26 | 1990-03-28 | Erlau Ag Eisen Drahtwerk | Device for checking overloading of chains |
| FR2732459A1 (en) * | 1995-03-27 | 1996-10-04 | Mannesmann Ag | DEVICE FOR MEASURING FRICTION FORCE TO BE SET BETWEEN TWO WORKPIECES |
| CN101692015B (en) * | 2009-09-05 | 2011-03-30 | 山西煤矿机械制造有限责任公司 | Device for measuring tension of scraper conveyer chain |
| WO2015157830A1 (en) * | 2014-03-26 | 2015-10-22 | BASTOS DE ARAUJO, Jairo | Equipment for determining traction in anchoring lines |
| US10078025B2 (en) | 2014-03-26 | 2018-09-18 | Bastos De Araújo, Jairo | Device for determining tension on anchoring lines |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |