CN202897453U - Rubber belt conveyor and monitoring protection device used for the same - Google Patents
Rubber belt conveyor and monitoring protection device used for the same Download PDFInfo
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- CN202897453U CN202897453U CN 201220563831 CN201220563831U CN202897453U CN 202897453 U CN202897453 U CN 202897453U CN 201220563831 CN201220563831 CN 201220563831 CN 201220563831 U CN201220563831 U CN 201220563831U CN 202897453 U CN202897453 U CN 202897453U
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- adhesive tape
- central axis
- transverse central
- contact support
- sensor
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 238000012545 processing Methods 0.000 claims abstract description 14
- 239000002390 adhesive tape Substances 0.000 claims description 97
- 239000000463 material Substances 0.000 claims description 11
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 239000008397 galvanized steel Substances 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000011664 signaling Effects 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000017105 transposition Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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Abstract
The utility model provides a monitoring protection device used for a rubber belt conveyor. The monitoring protection device used for the rubber belt conveyor comprises a rubber belt contact support frame, a signal processing component and a support base. The rubber belt contact support frame comprises a transverse center shaft which is arranged on the support base in a suspended mode and is capable of rotating. The signal processing component comprises a launcher, a sensor and a processor, wherein the launcher is installed on the rubber belt contact support frame, the sensor is not contacted with the launcher and is installed corresponding to the position of the launcher, the sensor is used for monitoring a signal sent by the launcher and transmitting the signal the processor, and the processor is used for analyzing the signal and controlling stopping or operating of the rubber belt conveyor. The utility model further provides the rubber belt conveyor. The monitoring protection device used for the rubber belt conveyor has the advantages of being reliable, accurate, sensitive and capable of timely and accurately finding out longitudinal tear of rubber belt.
Description
Technical field
The utility model relates to rubber belt conveyor protector, relates in particular to a kind of monitoring and protecting device and travelling apron for travelling apron.
Background technology
The belt travelling apron is to double as trailer coupling and load carrier with load-transfer device, the equipment that transports continuously under the driving of electrical motor.Load-transfer device runs through the total length of conveyer, be more than 2 times of fuselage length, and consumption is large, and price is high, needs periodic replacement, accounts for about half of conveyer operating cost.The load-transfer device of travelling apron is wanted crack-free, and laterally breach is no more than 5% of bandwidth, and the protection glue-line comes off and is no more than 0.3m
2, median fiber slabbing mouth must not surpass 5% of bandwidth.But, rubber belt from deviating, broken belt often can occur in the production and application process, skid, reverse the most common failures such as driving, longitudinal tear.After particularly the longitudinal rupture of adhesive tape accident has occured travelling apron, cause the increase of the great direct or indirect economic loss of bargh, productive costs, incur loss through delay and produce, impact is produced and is carried out smoothly.
Over the years; travelling apron is along with in industry widespread use and popularizations such as coal, metallurgy, electric power, food, medicines; have many people to begin one's study and discussion prevents the transportation rubber belt protective device against longitudinal tear, the direction of its research roughly has the protection in advance device that puts prevention first and tears the monitoring device of the physical quantity that rear transportation rubber belt changes.The protection in advance device can be limited the possibility of avoiding occuring the longitudinal tear accident; but in the important fender guard of conveyer safe operation; existing protection in advance device has limitation; generally can only be for causing a kind of reason of tearing; all can't be removed fully and the hidden danger of tearing can be caused; in fact also be difficult to prevent fully the generation of the accident of tearing, so the effect of protection in advance device is limited.Also having some to use control monitor units is to wear out appearance projection behind the adhesive tape, drives other mechanicals device actions and since the error of installing and operation can not be accurate, just must cause misoperation or the sensitivity of detecting device.
Therefore, develop a kind of reliably, accurate, sensitive, can find promptly and accurately that the monitoring and protecting device of longitudinal rupture of adhesive tape is very important.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of reliable, accurate, sensitive the monitoring and protecting device and the travelling apron that are used for travelling apron are provided.
The technical solution of the utility model provides a kind of monitoring and protecting device for travelling apron, comprises adhesive tape contact support, signal processing component and bearing; Described adhesive tape contact support comprises transverse central axis, and described transverse central axis is erected on the described bearing and can rotates; Described signal processing component comprises projector, sensor and treater, described projector is installed on the described adhesive tape contact support, described sensor does not contact with described projector, also install the position of corresponding described projector, the signal that described sensor sends for detection of described projector, described sensor is used for described signal is passed to described treater, and described treater is used for analyzing described signal and stopping or moving according to the described travelling apron of described signal control.
Preferably, described adhesive tape contact support comprises hinged upper grooved frame and lower parallel shelf, and described transverse central axis is arranged on the middle part of described upper grooved frame.
Preferably, described upper grooved frame is divided into groove type top and rectangular lower take described transverse central axis as the boundary, be provided with two vertical poles between described groove type top and the described transverse central axis, be provided with two crossing branching rods between described rectangular lower and the described transverse central axis.
Preferably, described treater comprises Programmable Logic Controller.
Preferably, described bearing comprises the oscillating bearing that is arranged in described transverse central axis two ends, and described oscillating bearing is used for supporting described transverse central axis.
Preferably, described bearing is provided with fixing rack for sensor.
Preferably, it is stainless steel material that described adhesive tape props up contact bar, or galvanized steel pipe is made.
Another technical scheme of the present utility model provides a kind of travelling apron, comprise at least two idler assemblies, described idler assembly comprises for the upper groove profile carrier roller frame of transmission adhesive tape with for the lower parallel roll frame that transmits lower adhesive tape, be provided with the monitoring and protecting device between the adjacent described idler assembly, described monitoring and protecting device comprises adhesive tape contact support, signal processing component and bearing; Described adhesive tape contact support is arranged on the below of described adhesive tape or described lower adhesive tape, and the middle part of described adhesive tape contact support is provided with transverse central axis, and described transverse central axis is erected on the described bearing and can rotates; Described signal processing component comprises projector, sensor and treater, described projector is installed on the described adhesive tape contact support, described sensor does not contact with described projector, also install the position of corresponding described projector, the signal that described sensor sends for detection of described projector, described sensor is used for described signal is passed to described treater, described treater is used for analyzing described signal, and stopping or moving according to the described travelling apron of described signal control.
Preferably, described adhesive tape contact support comprises hinged upper grooved frame and lower parallel shelf, described transverse central axis is arranged on the middle part of described upper grooved frame, and described upper grooved frame is arranged in the below of described adhesive tape, and described lower parallel shelf is arranged in the below of described lower adhesive tape.
Preferably, described upper grooved frame is divided into groove type top and rectangular lower take described transverse central axis as the boundary, be provided with two vertical poles between described groove type top and the described transverse central axis, be provided with two crossing branching rods between described rectangular lower and the described transverse central axis.
Preferably, the distance between described upper grooved frame and the described adhesive tape is 30mm, and the distance between described lower parallel shelf and the described lower adhesive tape is 20mm.
Preferably, described treater comprises Programmable Logic Controller.
Preferably, described bearing comprises the oscillating bearing that is arranged in described transverse central axis two ends, and described oscillating bearing is used for supporting described transverse central axis.
Preferably, described bearing is provided with fixing rack for sensor.
Preferably, described adhesive tape contact support is stainless steel material, or galvanized steel pipe is made.
After adopting technique scheme; has following beneficial effect: because the contact of the adhesive tape in monitoring and protecting device support is positioned at the below of adhesive tape or lower adhesive tape; when the initial stage of adhesive tape at longitudinal tear; or the cracking that occurs after the normal wear; decortication; during the phenomenons such as adhesive tape is lax; adhesive tape touches adhesive tape contact support; so that adhesive tape contact support rotates around transverse central axis; angular transposition occurs; after sensor detects angular displacement signal; be transferred to treater; treater is according to angular displacement signal, analyzes the damage situations of adhesive tape, and the stopping or continuing of control travelling apron moves.
Description of drawings
Fig. 1 is the block diagram of travelling apron among the utility model one embodiment;
Fig. 2 is the cutaway view of travelling apron among the utility model one embodiment;
Fig. 3 is the structural representation of monitoring and protecting device among the utility model one embodiment;
Fig. 4 is the partial enlarged drawing of signal processing component among the utility model one embodiment;
Fig. 5 be among Fig. 4 A to structural representation.
The Reference numeral synopsis:
1---idler assembly 2---monitoring and protecting device 3---feeder
11---upper groove profile carrier roller frame 12---lower parallel roll frame 21---adhesive tape contact supports
22---signal processing component 23---bearing 31---adhesive tapes
32---the upper grooved framves of lower adhesive tape 211---transverse central axis 212---
212a---the vertical pole of groove type top 212b---rectangular lower 212c---
212d---crossing branching rod 213---lower parallel shelf 221---projector
222---sensor 231---oscillating bearing 232---fixing rack for sensor
The specific embodiment
Further specify the specific embodiment of the present utility model below in conjunction with accompanying drawing.
As Figure 1-3, travelling apron comprises at least two idler assemblies 1, idler assembly 1 comprises for the upper groove profile carrier roller frame 11 of transmission adhesive tape 31 with for the lower parallel roll frame 12 that transmits lower adhesive tape 32, be provided with monitoring and protecting device 2 between the adjacent idler assembly 1, monitoring and protecting device 2 comprises adhesive tape contact support 21, signal processing component 22 and bearing 23; Adhesive tape contact support 21 is arranged on the below of adhesive tape 31 or lower adhesive tape 32, and the middle part of adhesive tape contact support 21 is provided with transverse central axis 211, and transverse central axis 211 is erected on the bearing 23 and can rotates; Signal processing component 22 comprises projector 221, sensor 222 and treater (not shown), projector 221 is installed on the adhesive tape contact support 21, sensor 222 does not contact with projector 221, also install the position of corresponding projector 221, the signal that sensor 222 sends for detection of projector 221, sensor 222 is used for signal is passed to treater, treater is used for analytic signal, and stopping or moving according to the signal control travelling apron.
But; after being pierced through adhesive tape (31 and 32) with material by hard thing or ironware and forming longitudinal tear; perhaps since pointed hard thing adhesive tape (31 and 32) is pierced through when tearing; having material falls behind under the tearing port and touches on the adhesive tape contact support 21; or produce laterally breach peeling of adhesive tape (31 and 32) because of normal wear; the decortication of protection glue-line; outward flange has been cut bar; during the phenomenons such as the longitudinal tear that causes after wire-core is drawn out of; make adhesive tape (31 and 32) upper along being with foreign matter to contact support 21 contacts with adhesive tape; so that adhesive tape contact support 21 rotates around transverse central axis 211; produce angular transposition; the projector 221 that is installed in this moment on the adhesive tape contact support 21 produces angular transposition with adhesive tape contact support 21; sensor 222 detects angular displacement signal; angular displacement signal is passed to treater; treater diagonal displacement signal is analyzed; after angular transposition surpasses predefined numerical value; for example: during more than or equal to 15 °; treater control travelling apron quits work; so that adhesive tape (31 and 32) in time was found at the initial stage that produces longitudinal tear; in time change, avoid producing larger loss.When less than 15 °, the rotation of adhesive tape contact support 21 may be that slight scraping is caused because mechanical vibration or adhesive tape (31 and 32) contacts support 21 with adhesive tape, and travelling apron does not quit work, and continuation moves.
In actual applications, the angular dimension of angular transposition can specifically arrange according to the model of travelling apron, the weight of transporting material, working environment etc.
In the present embodiment, as shown in Figure 3, adhesive tape contact support 21 comprises hinged upper grooved frame 212 and lower parallel shelf 213, and transverse central axis 211 is arranged on the middle part of grooved frame 212, upper grooved frame 212 is arranged in the below of adhesive tape 31, and lower parallel shelf 213 is arranged in the below of lower adhesive tape 32.When adhesive tape 31 is worked for travelling apron, the adhesive tape of convey materials, the adhesive tape of lower adhesive tape 32 for making the return trip empty.Upper groove-shaped frame 212 is the groove type rod member, and the shape of itself and adhesive tape 31 and upper groove profile carrier roller frame 11 is complementary, and lower parallel shelf 213 is rod member parallel to the ground, and the shape of itself and lower adhesive tape 32 and lower parallel roll frame 12 is complementary.The employing hinge-coupled is integral, and is in order to reach globality, convenient and swift in order to install and to change simultaneously.Transverse central axis 211 is arranged on the middle part of grooved frame 212, so that the weight of the part of transverse central axis below 211 is greater than the weight of transverse central axis part more than 211, adhesive tape contact support 21 can balance and is kept center of gravity line forever to protect straight down state like this, can be sensitive under the effect that is subjected to external force, the accurately effect that changes of response behaviour.
Preferably, as shown in Figure 3, upper grooved frame 212 is divided into groove type top 212a and rectangular lower 212b take transverse central axis 211 as the boundary, be provided with two vertical pole 212c between groove type top 212a and the transverse central axis 211, be provided with two crossing branching rod 212d between rectangular lower 212b and the transverse central axis 211.Vertical pole 212c and crossing branching rod 212d are used for brace groove shape top 212a, transverse central axis 211 and rectangular lower 212b.
Preferably, the distance between upper grooved frame 212 and the adhesive tape 31 is 30mm, and the distance between lower parallel shelf 213 and the lower adhesive tape 32 is 20mm.Distance is crossed the sensitivity that conference affects the monitoring and protecting device, and the too small meeting of distance affects the accuracy of this monitoring and protecting device owing to the vibration of adhesive tape trace.
Preferably, treater comprises Programmable Logic Controller (Programmable Logic Controller is called for short PLC).In the present embodiment, sensor 222 belongs to inductance sensor, is widely used in very much in the industrial circle, according to different environmental requirements, corresponding model is arranged, and down-hole and surface production facilities all can be used.Inductance sensor has perfect condition precedent: no touch and without wearing and tearing mode of operation and high switching frequency and switch precision.Have in addition antidetonation and swing, prevent dust and explosion-proof, moistureproof moist.Sensor 222 sends impulse singla and is delivered to PLC, and PLC carries out sending the instruction that whether stops the travelling apron operation after logic analysis is judged.
Preferably, shown in Fig. 4-5, bearing 23 comprises the oscillating bearing 231 that is arranged in transverse central axis 211 two ends, and oscillating bearing 231 is used for supporting transverse central axis 211.Oscillating bearing 231 is quick on the draw transverse central axis 211, and is simple in structure, stable.
Preferably, shown in Fig. 4-5, bearing 23 is provided with fixing rack for sensor 232.Fixing rack for sensor 232 is used for fixation of sensor 222.
Preferably, adhesive tape contact support 21 is stainless steel material, or galvanized steel pipe is made.
Monitoring and protecting device in the utility model can be arranged many places in travelling apron, the realization multiple spot is monitored simultaneously, increases the sensitivity of monitoring.Travelling apron of the present utility model and monitoring and protecting device project organization are simple, alerting signal is reliable accurately, low production cost, produce in process of production the longitudinal tear initial stage just can control fault spread and again generation.
Above-described only is principle of the present utility model and preferred embodiment.Should be pointed out that for the person of ordinary skill of the art, on the basis of the utility model principle, can also make some other modification, also should be considered as protection domain of the present utility model.
Claims (15)
1. a monitoring and protecting device that is used for travelling apron is characterized in that, comprises adhesive tape contact support, signal processing component and bearing;
Described adhesive tape contact support comprises transverse central axis, and described transverse central axis is erected on the described bearing and can rotates;
Described signal processing component comprises projector, sensor and treater, described projector is installed on the described adhesive tape contact support, described sensor does not contact with described projector, also install the position of corresponding described projector, the signal that described sensor sends for detection of described projector, described sensor is used for described signal is passed to described treater, and described treater is used for analyzing described signal and stopping or moving according to the described travelling apron of described signal control.
2. monitoring and protecting device according to claim 1 is characterized in that, described adhesive tape contact support comprises hinged upper grooved frame and lower parallel shelf, and described transverse central axis is arranged on the middle part of described upper grooved frame.
3. monitoring and protecting device according to claim 2; it is characterized in that; described upper grooved frame is divided into groove type top and rectangular lower take described transverse central axis as the boundary; be provided with two vertical poles between described groove type top and the described transverse central axis, be provided with two crossing branching rods between described rectangular lower and the described transverse central axis.
4. monitoring and protecting device according to claim 1 is characterized in that, described treater comprises Programmable Logic Controller.
5. monitoring and protecting device according to claim 1 is characterized in that, described bearing comprises the oscillating bearing that is arranged in described transverse central axis two ends, and described oscillating bearing is used for supporting described transverse central axis.
6. monitoring and protecting device according to claim 1 is characterized in that, described bearing is provided with fixing rack for sensor.
7. monitoring and protecting device according to claim 1 is characterized in that, described adhesive tape contact support is stainless steel material, or galvanized steel pipe is made.
8. travelling apron, comprise at least two idler assemblies, described idler assembly comprises for the upper groove profile carrier roller frame of transmission adhesive tape with for the lower parallel roll frame that transmits lower adhesive tape, it is characterized in that, be provided with the monitoring and protecting device between the adjacent described idler assembly, described monitoring and protecting device comprises adhesive tape contact support, signal processing component and bearing;
Described adhesive tape contact support is arranged on the below of described adhesive tape or described lower adhesive tape, and the middle part of described adhesive tape contact support is provided with transverse central axis, and described transverse central axis is erected on the described bearing and can rotates;
Described signal processing component comprises projector, sensor and treater, described projector is installed on the described adhesive tape contact support, described sensor does not contact with described projector, also install the position of corresponding described projector, the signal that described sensor sends for detection of described projector, described sensor is used for described signal is passed to described treater, described treater is used for analyzing described signal, and stopping or moving according to the described travelling apron of described signal control.
9. travelling apron according to claim 8, it is characterized in that, described adhesive tape contact support comprises hinged upper grooved frame and lower parallel shelf, described transverse central axis is arranged on the middle part of described upper grooved frame, described upper grooved frame is arranged in the below of described adhesive tape, and described lower parallel shelf is arranged in the below of described lower adhesive tape.
10. travelling apron according to claim 9, it is characterized in that, described upper grooved frame is divided into groove type top and rectangular lower take described transverse central axis as the boundary, be provided with two vertical poles between described groove type top and the described transverse central axis, be provided with two crossing branching rods between described rectangular lower and the described transverse central axis.
11. travelling apron according to claim 9 is characterized in that, the distance between described upper grooved frame and the described adhesive tape is 30mm, and the distance between described lower parallel shelf and the described lower adhesive tape is 20mm.
12. travelling apron according to claim 8 is characterized in that, described treater comprises Programmable Logic Controller.
13. travelling apron according to claim 8 is characterized in that, described bearing comprises the oscillating bearing that is arranged in described transverse central axis two ends, and described oscillating bearing is used for supporting described transverse central axis.
14. travelling apron according to claim 8 is characterized in that, described bearing is provided with fixing rack for sensor.
15. travelling apron according to claim 8 is characterized in that, described adhesive tape contact support is stainless steel material, or galvanized steel pipe is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220563831 CN202897453U (en) | 2012-10-30 | 2012-10-30 | Rubber belt conveyor and monitoring protection device used for the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220563831 CN202897453U (en) | 2012-10-30 | 2012-10-30 | Rubber belt conveyor and monitoring protection device used for the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202897453U true CN202897453U (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220563831 Expired - Lifetime CN202897453U (en) | 2012-10-30 | 2012-10-30 | Rubber belt conveyor and monitoring protection device used for the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202897453U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016187963A1 (en) * | 2015-05-26 | 2016-12-01 | 中国矿业大学 | Coal dropping impact energy buffer monitoring device and method for coal mine belt conveying system |
| CN107555124A (en) * | 2016-06-30 | 2018-01-09 | 南京梅山冶金发展有限公司 | Multifunctional leather belt detection means and signal recognition method |
| CN106144492B (en) * | 2016-08-25 | 2018-06-15 | 永城煤电控股集团有限公司 | Contactless coal mine travelling belt sideslip guard method and device |
| CN114180268A (en) * | 2022-02-17 | 2022-03-15 | 江苏科比泰智能科技有限公司 | Rubber belt conveyor monitoring system and method based on machine vision |
-
2012
- 2012-10-30 CN CN 201220563831 patent/CN202897453U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016187963A1 (en) * | 2015-05-26 | 2016-12-01 | 中国矿业大学 | Coal dropping impact energy buffer monitoring device and method for coal mine belt conveying system |
| CN107555124A (en) * | 2016-06-30 | 2018-01-09 | 南京梅山冶金发展有限公司 | Multifunctional leather belt detection means and signal recognition method |
| CN106144492B (en) * | 2016-08-25 | 2018-06-15 | 永城煤电控股集团有限公司 | Contactless coal mine travelling belt sideslip guard method and device |
| CN114180268A (en) * | 2022-02-17 | 2022-03-15 | 江苏科比泰智能科技有限公司 | Rubber belt conveyor monitoring system and method based on machine vision |
| CN114180268B (en) * | 2022-02-17 | 2022-05-27 | 江苏科比泰智能科技有限公司 | Rubber belt conveyor monitoring system and method based on machine vision |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130424 |
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| CX01 | Expiry of patent term |