CN109404043A - A kind of underground equipment sensory perceptual system - Google Patents
A kind of underground equipment sensory perceptual system Download PDFInfo
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- CN109404043A CN109404043A CN201811220375.3A CN201811220375A CN109404043A CN 109404043 A CN109404043 A CN 109404043A CN 201811220375 A CN201811220375 A CN 201811220375A CN 109404043 A CN109404043 A CN 109404043A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
Abstract
The invention discloses a kind of underground equipment sensory perceptual system, which includes multiple vibration acquisition units, and the vibration acquisition unit includes multiple sensors, collector, data switching exchane and transient data analytical unit；Multiple sensors are electrically connected with collector, and the collector and the data exchange mechatronics, the data switching exchane are electrically connected with the transient data analytical unit.Underground equipment sensory perceptual system provided by the present application is by continuously monitoring rotating machinery operational shock parameter on-line, the operation conditions of unit is understood in time, important data information is provided for the pre- diagnosis of accident sign, quick diagnostic analysis is carried out to the failure occurred, failure cause is pointed out in time, it reminds operations staff to take necessary measure, provides reliable guarantee for the safe operation of unit.Furthermore it can judge that rotating machinery has without exception or fault trend by the tight monitoring of system and diagnostic analysis.
Description
Technical field
The present invention relates to slewing monitoring technical fields, are suitable for colliery downhole equipment perception system more particularly to one kind
System.
Background technique
In recent years, significantly improving with the enlargement of coal mining enterprise device structure and the degree of automation, to equipment can
Requirement by property and safety is also higher and higher.Each large coal mine enterprise also has been devoted to improve production link means
Scientific and technological content and level, explore equipment control long-range, the target that operation is unmanned, monitoring of tools is scientific.One of them
Critically important project is exactly to study the status monitoring of coal mine large size Key generating unit equipment, finds security risk in time, estimated in advance,
And alarm, the transformation in maintenance direction how is predicted from traditional scheduled overhaul to state.
On the one hand, facilities and equipments perception status monitoring and failure analysis techniques are not only related to the maintenance aspect of equipment, it
To improving the work of links in equipment life cycle management, including design, manufacture, installation, maintenance, maintenance and spare part and set
Standby management etc. both provides science, guiding foundation.
On the other hand, important component of the failure analysis techniques as sophisticated equipment management is equipment management and dimension
Repair the essential means of management.In today that market competition is increasingly fierce, the control and reduction of maintenance of equipment cost are enterprises
One of the potentiality that can most excavate.Therefore, application failure technology, make state Predictive Maintenance replace tradition and fall behind breakdown maintenance and
Preventive maintenance is the certainty of history.
Summary of the invention
The present invention provides a kind of underground equipment sensory perceptual systems.
The present invention provides following schemes:
A kind of underground equipment sensory perceptual system, comprising:
Multiple vibration acquisition units, the vibration acquisition unit include multiple sensors, collector, data switching exchane and
Transient data analytical unit；Multiple sensors are electrically connected with collector, and the collector is electrically connected with the data switching exchane
It connects, the data switching exchane is electrically connected with the transient data analytical unit；
Central server, the central server are electrically connected with the transient data analytical unit；
Wherein, multiple sensors are installed at the easy vibration component test point of equipment to be monitored, the equipment to be monitored
Including at least water pump assembly and Belt Conveying unit；Multiple sensors include multiple speed probes and or it is multiple plus
Velocity sensor and or temperature sensor；The collector, which is used to obtain equipment to be monitored by multiple sensors, easily to shake
The vibration monitoring data of dynamic component；The data switching exchane is for will be transferred to the transient state after the vibration monitoring data conversion
Data analysis unit；The transient data analytical unit is used to be analyzed and be handled acquisition number for the vibration monitoring data
According to characteristic signal, and the characteristic signal is periodically transferred to the central server.
Preferred: the transient data analytical unit includes Intel Bay Trail J1900/E3845 double-core 1.4G low
Power consumption processor chips and built-in 2G memory and 64G memory capacity.
Preferred: the water pump assembly includes motor and centrifuge；The test point includes that motor anti-drive end is vertical
Test point, the horizontal test point of motor anti-drive end, motor drive terminal vertical detection point, the horizontal test point of motor drive terminal, centrifugation
Machine input terminal vertical detection point, the horizontal test point of centrifuge input terminal, centrifuge non-input end vertical detection point, centrifuge are non-defeated
Enter the horizontal test point in end, water pump at the end of the axial inspection test point, shaft coupling test point.
Preferred: the motor anti-drive end vertical detection point, the horizontal test point of motor anti-drive end, motor drive terminal hang down
Straight test point, the horizontal test point of motor drive terminal, centrifuge input terminal vertical detection point, the horizontal test point of centrifuge input terminal,
Centrifuge non-input end vertical detection point, the horizontal test point in centrifuge non-input end, water pump at the end of the axial inspection test point are used to
Acceleration transducer is set, and the shaft coupling test point is for being arranged speed probe.
It is preferred: the water pump assembly be 4 groups, multiple acceleration transducers that water pump assembly described in 4 groups respectively contains with
And speed probe is connected with independent collector respectively.
It is preferred: the Belt Conveying unit include belt motor, belt conveyor and without driving roller；The belt
Motor, belt conveyor and without driving roller be respectively arranged with multiple test points.
Preferred: the test point that the belt motor includes includes belt motor anti-drive end vertical detection point, belt electricity
The horizontal test point of machine anti-drive end, belt motor pedestal vertical detection point, belt motor drive end vertical detection point, belt motor
Drive the horizontal test point in end, fluid coupling vertical detection point, gear-box input vertical detection point, the detection of gear-box input level
Point, gear-box export vertical detection point, gear-box output level test point, drum driven end vertical detection point, drum driven end
Horizontal test point, Rotating speed measring point；Wherein, the belt motor anti-drive end vertical detection point, belt motor anti-drive end water
Flat test point, belt motor pedestal vertical detection point, belt motor driving end vertical detection point, belt motor driving end level inspection
Measuring point, fluid coupling vertical detection point, gear-box input vertical detection point, gear-box input level test point, gear-box are defeated
Vertical detection point, gear-box output level test point, drum driven end vertical detection point are used to setting acceleration transducer out,
The horizontal test point in drum driven end is for being arranged temperature sensor, and the Rotating speed measring point is for being arranged velocity sensor.
It is preferred: described that driving roller is provided with multiple test points for being used to detect bearing fault.
Preferred: the test point for including without driving roller includes without driving roller left bearing vertical detection point, without drive
Dynamic roller right bearing vertical detection point；Wherein, described to hang down without driving roller left bearing vertical detection point, without driving roller right bearing
Straight test point is respectively used to setting acceleration transducer and temperature sensor.
It is preferred: it is described without driving roller be 8.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
By the invention it is possible to realize a kind of underground equipment sensory perceptual system, in an implementation mode, which be can wrap
Multiple vibration acquisition units are included, the vibration acquisition unit includes multiple sensors, collector, data switching exchane and transient state number
According to analytical unit；Multiple sensors are electrically connected with collector, the collector and the data exchange mechatronics, described
Data switching exchane is electrically connected with the transient data analytical unit；Central server, the central server and the transient state number
It is electrically connected according to analytical unit；Wherein, multiple sensors are installed at the easy vibration component test point of equipment to be monitored, it is described to
Monitoring device includes at least water pump assembly and Belt Conveying unit；Multiple sensors include multiple speed probes and
Or multiple acceleration transducers and or temperature sensor；The collector is used to obtain by multiple sensors to be monitored
The vibration monitoring data of the easy vibration component of equipment；The data switching exchane after the vibration monitoring data conversion for will be transferred to
The transient data analytical unit；The transient data analytical unit is for being analyzed the vibration monitoring data and being located
Reason obtains the characteristic signal of data, and the characteristic signal is periodically transferred to the central server.The application provides
Underground equipment sensory perceptual system be integrated with the high-tech of the technologies such as sensor technology, signal processing, computer application, expert system
Application product.System understands the operation conditions of unit in time, is thing by continuously monitoring rotating machinery operational shock parameter on-line
Therefore the pre- diagnosis of sign provides important data information, carries out quick diagnostic analysis to the failure occurred, points out event in time
Hinder reason, reminds operations staff to take necessary measure, provide reliable guarantee for the safe operation of unit.Furthermore it can pass through and be
The tight monitoring of system and diagnostic analysis, judge that rotating machinery has without exception or fault trend.
Certainly, it implements any of the products of the present invention and does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of connection block diagram of underground equipment sensory perceptual system provided in an embodiment of the present invention；
Fig. 2 is system body vibration measuring points placement figure provided in an embodiment of the present invention；
Fig. 3 is the vibration detection point layout drawing of water pump provided in an embodiment of the present invention；
Fig. 4 is belt feeder winding schematic diagram provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's every other embodiment obtained belong to what the present invention protected
Range.
Embodiment
It is a kind of underground equipment sensory perceptual system provided in an embodiment of the present invention, such as Fig. 1 institute referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4
Show, which includes multiple vibration acquisition units, and the vibration acquisition unit includes multiple sensors, collector, data exchange
Machine and transient data analytical unit；Multiple sensors are electrically connected with collector, the collector and the data exchange
Mechatronics, the data switching exchane are electrically connected with the transient data analytical unit；
Central server, the central server are electrically connected with the transient data analytical unit；
Wherein, multiple sensors are installed at the easy vibration component test point of equipment to be monitored, the equipment to be monitored
Including at least water pump assembly and Belt Conveying unit；Multiple sensors include multiple speed probes and or it is multiple plus
Velocity sensor and or temperature sensor；The collector, which is used to obtain equipment to be monitored by multiple sensors, easily to shake
The vibration monitoring data of dynamic component；The data switching exchane is for will be transferred to the transient state after the vibration monitoring data conversion
Data analysis unit；The transient data analytical unit is used to be analyzed and be handled acquisition number for the vibration monitoring data
According to characteristic signal, and the characteristic signal is periodically transferred to the central server.
Further, the transient data analytical unit includes Intel Bay Trail J1900/E3845 double-core 1.4G
Low power processor chip and built-in 2G memory and 64G memory capacity.
Further, the water pump assembly includes motor and centrifuge；The test point includes that motor anti-drive end hangs down
Straight test point, the horizontal test point of motor anti-drive end, motor drive terminal vertical detection point, the horizontal test point of motor drive terminal, from
Scheming input terminal vertical detection point, the horizontal test point of centrifuge input terminal, centrifuge non-input end vertical detection point, centrifuge are non-
The horizontal test point of input terminal, water pump at the end of the axial examine test point, shaft coupling test point.The motor anti-drive end vertical detection
Point, the horizontal test point of motor anti-drive end, motor drive terminal vertical detection point, the horizontal test point of motor drive terminal, centrifuge are defeated
Enter to hold vertical detection point, the horizontal test point of centrifuge input terminal, centrifuge non-input end vertical detection point, centrifuge non-input end
Horizontal test point, water pump at the end of the axial inspection test point are used to setting acceleration transducer, and the shaft coupling test point is for setting
Set speed probe.The water pump assembly is 4 groups, multiple acceleration transducers that water pump assembly described in 4 groups respectively contains and
Speed probe is connected with independent collector respectively.
Further, the Belt Conveying unit include belt motor, belt conveyor and without driving roller；The skin
Translator, belt conveyor and without driving roller be respectively arranged with multiple test points.The test point that the belt motor includes
It is vertically examined including belt motor anti-drive end vertical detection point, the horizontal test point of belt motor anti-drive end, belt motor pedestal
Measuring point, belt motor driving end vertical detection point, the horizontal test point in belt motor driving end, fluid coupling vertical detection point,
Gear-box inputs vertical detection point, gear-box input level test point, gear-box and exports vertical detection point, gear-box output level
Test point, drum driven end vertical detection point, the horizontal test point in drum driven end, Rotating speed measring point；Wherein, the belt motor
Anti-drive end vertical detection point, the horizontal test point of belt motor anti-drive end, belt motor pedestal vertical detection point, belt motor
Drive end vertical detection point, the horizontal test point in belt motor driving end, fluid coupling vertical detection point, gear-box input vertical
Test point, gear-box input level test point, gear-box output vertical detection point, gear-box output level test point, roller drive
Moved end vertical detection point is used to setting acceleration transducer, and the horizontal test point in drum driven end is for being arranged temperature sensing
Device, the Rotating speed measring point is for being arranged velocity sensor.It is described multiple for detecting bearing fault without driving roller to be provided with
Test point.The test point for including without driving roller includes without driving roller left bearing vertical detection point, without driving roller
Right bearing vertical detection point；Wherein, it is described without driving roller left bearing vertical detection point, without driving roller right bearing vertical detection
Point is respectively used to setting acceleration transducer and temperature sensor.It is described without driving roller be 8.
The technical program is that it is complete to provide rotating machinery state on_line monitoring system according to the technical characterstic of live unit
Whole solution, and hardware support kit is provided, technology and Engineering Service etc..Design feature of the system based on water pump, it is normal in conjunction with unit
See failure mechanism and feature, sufficiently uses computer technology, modern signal processing technology and INTERNET technology, in conjunction with
DAM9210, DAM9121 collector and TDP9100 transient data analysis module.With reliable and stable, data are accurate, accident analysis
The features such as powerful.
Vibration acquisition device module is specific to the height that the status signals such as vibration equipment, revolving speed, temperature, electric current are acquired
Performance evaluation module.It is using current international state-of-the-art calculating order tracking technique algorithm.(COT,Computation Order
Tracking algorithm) equipment vibrating signal is acquired, it analyzes and calculates.Module uses DSP+FPGA framework,
FPGA guarantees vibration and the tach signal high speed synchronous sample of access, and DSP utilizes its superpower computing capability, in real time to signal meter
Calculate order tracking technique analysis.
TDP9100 (Transient data analysis processor) uses Intel Bay Trail J1900/
E3845 double-core 1.4G low power processor chip.Built-in 2G memory and 64G memory capacity, powerful processing capacity can be simultaneously
Signal analysis is carried out to up to a hundred vibration measuring points.TDP9100 has double netcard structure, and entire FiEHMS (equipment health pipe
Reason system) Communication Gateway module in framework, on the one hand its one side chained device layer links with central server.TDP9100
By the signals such as Ethernet or the vibration of serial acquisition mechanical floor, current of electric, temperature, flow, and to data carry out analysis and
The characteristic signal of data, is finally periodically uploaded to central server again and stored by processing.It will be huge by TDP9100
Vibration primary data analysis function transfers to mechanical floor, carries out edge calculations in facility network network layers, significantly mitigation enterprise's main ring network
With the pressure of central server.
One complete water pump include motor and centrifugal chiller at.Unit entire so just includes rotor, axis, leaf
The more component for being also easy to produce vibration such as wheel, the pump housing, therefore the normal vibrations for being mingled with the generation of these components in unit vibration frequency spectrum more
Dynamic frequency or abnormal frequency.Since vibration monitoring is to carry out the most common monitoring side of condition monitoring and fault diagnosis to mechanical equipment
Method, therefore the diagnosis to water pump is realized by vibration monitoring, need to extract and analyze the rumble spectrum of most common failure.The vibration of water pump
Dynamic measuring point value arrangement map is as shown in Fig. 2, Fig. 3 and table 1.And event common according to the summary of experience water outlet pump of the structure of water pump and many years
The failure mode that barrier frequency is easy to mix includes: the part of bearing fault, rotor failure, shaft coupling failure, rotating part
Loosening, cracking etc..
Live bearing mounting temperature sensor, supervises bear vibration so this mainly installs vibrating sensor
It surveys.Measuring point is given in every water pump configuration 10, wherein motor side 4, is mainly used for monitoring motor bearings and rotor failure, centrifugation
Generator terminal monitors 5, too low or too high caused axial for resonance caused by water pump bearing, impeller and pipeline and flow
Vibration.Monitoring pump rotary speed measuring point 1 carries out waiting periodic samplings and real-time tachometric survey when for vibration analysis.Collector makes
With 10 channel collector DAM9210, a water pump measuring point demand can satisfy.
Table 1
Belt feeder is mainly made of devices such as motor, fluid-flywheel clutch, speed reducer, driving roller, changed course, belt tensioning drums.
Integral body is earned using quality steel plate branch, belongs to suspension support structure.Equipped with belt/roller, carrying roller etc. in belt feeder rack, use
In drive and bearing conveyor belt.Belt feeder winding is as shown in Figure 4:
Wherein belt motor system belongs to more transmission coupled structures, and motor side revolving speed is 1448rpm, belongs to vibration measurement
Normal frequency, for motor speed after fluid coupling, gearbox speed reduction, output revolving speed is less than 48rpm, belongs to low-frequency range,
0.8HZ or less frequency response low frequency explosion-proof sensor should be selected.
It is as follows that belt motor system installs measuring point: motor side installation measuring point 5 (motor drive terminal and anti-drive end each 2,
Motor support pedestal 1), fluid-flywheel clutch measuring point 1,4 measuring points of gear-box drive for monitoring gear wear and bearing fault
Dynamic roller bearings at both ends installation 1 low-frequency vibration measuring point of each installation and temperature point.Drive roller end that one revolution speed sensing is installed
Device, real-time monitoring revolving speed.
Belt feeder system acquisition device selects collector DAM9121-164 set and 1 set of DAM9210 collector, DAM9133 temperature altogether
4 sets of collector of degree.Measuring point installation and the distribution of measuring point collector are as shown in 2 and table 2.
Table 2
Non-driven roller (changed course, tensioning etc. drive roller without motor) is consistent with driving roller, and two in roller survey each peace
Fill 1 low-frequency vibration measuring point and temperature point.8 be may include in scheme provided by the present application without driving roller, specific detection
Point is arranged as shown in Fig. 2 and table 3.
Underground equipment sensory perceptual system provided by the present application is integrated with sensor technology, signal processing, computer application, expert
The high-tech application product of the technologies such as system.System is understood in time by continuously monitoring rotating machinery operational shock parameter on-line
The operation conditions of unit provides important data information for the pre- diagnosis of accident sign, carries out to the failure occurred quick
Diagnostic analysis points out failure cause in time, reminds operations staff to take necessary measure, provides reliably for the safe operation of unit
Guarantee.Furthermore it can judge that rotating machinery has without exception or fault trend by the tight monitoring of system and diagnostic analysis.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (10)
1. a kind of underground equipment sensory perceptual system, which is characterized in that the system comprises:
Multiple vibration acquisition units, the vibration acquisition unit include multiple sensors, collector, data switching exchane and transient state
Data analysis unit；Multiple sensors are electrically connected with collector, the collector and the data exchange mechatronics, institute
Data switching exchane is stated to be electrically connected with the transient data analytical unit；
Central server, the central server are electrically connected with the transient data analytical unit；
Wherein, multiple sensors are installed at the easy vibration component test point of equipment to be monitored, and the equipment to be monitored is at least
Including water pump assembly and Belt Conveying unit；Multiple sensors include multiple speed probes and or multiple acceleration
Sensor and or temperature sensor；The collector is used to obtain the easy vibration section of equipment to be monitored by multiple sensors
The vibration monitoring data of part；The data switching exchane is for will be transferred to the transient data after the vibration monitoring data conversion
Analytical unit；The transient data analytical unit, which is used to that the vibration monitoring data to be analyzed and be handled, obtains data
Characteristic signal, and the characteristic signal is periodically transferred to the central server.
2. underground equipment sensory perceptual system according to claim 1, which is characterized in that the transient data analytical unit includes
Intel Bay Trail J1900/E3845 double-core 1.4G low power processor chip and the storage of built-in 2G memory and 64G
Capacity.
3. underground equipment sensory perceptual system according to claim 1, which is characterized in that the water pump assembly include motor and
Centrifuge；The test point includes motor anti-drive end vertical detection point, the horizontal test point of motor anti-drive end, motor drive terminal
Vertical detection point, the horizontal test point of motor drive terminal, centrifuge input terminal vertical detection point, the detection of centrifuge input terminal level
Point, centrifuge non-input end vertical detection point, the horizontal test point in centrifuge non-input end, water pump at the end of the axial inspection test point, connection
Axis device test point.
4. underground equipment sensory perceptual system according to claim 3, which is characterized in that the motor anti-drive end vertical detection
Point, the horizontal test point of motor anti-drive end, motor drive terminal vertical detection point, the horizontal test point of motor drive terminal, centrifuge are defeated
Enter to hold vertical detection point, the horizontal test point of centrifuge input terminal, centrifuge non-input end vertical detection point, centrifuge non-input end
Horizontal test point, water pump at the end of the axial inspection test point are used to setting acceleration transducer, and the shaft coupling test point is for setting
Set speed probe.
5. underground equipment sensory perceptual system according to claim 4, which is characterized in that the water pump assembly is 4 groups, 4 groups of institutes
It states multiple acceleration transducers that water pump assembly respectively contains and speed probe is connected with independent collector respectively.
6. underground equipment sensory perceptual system according to claim 1, which is characterized in that the Belt Conveying unit includes belt
Motor, belt conveyor and without driving roller；The belt motor, belt conveyor and without driving roller be respectively arranged with
Multiple test points.
7. underground equipment sensory perceptual system according to claim 6, which is characterized in that the test point that the belt motor includes
It is vertically examined including belt motor anti-drive end vertical detection point, the horizontal test point of belt motor anti-drive end, belt motor pedestal
Measuring point, belt motor driving end vertical detection point, the horizontal test point in belt motor driving end, fluid coupling vertical detection point,
Gear-box inputs vertical detection point, gear-box input level test point, gear-box and exports vertical detection point, gear-box output level
Test point, drum driven end vertical detection point, the horizontal test point in drum driven end, Rotating speed measring point；Wherein, the belt motor
Anti-drive end vertical detection point, the horizontal test point of belt motor anti-drive end, belt motor pedestal vertical detection point, belt motor
Drive end vertical detection point, the horizontal test point in belt motor driving end, fluid coupling vertical detection point, gear-box input vertical
Test point, gear-box input level test point, gear-box output vertical detection point, gear-box output level test point, roller drive
Moved end vertical detection point is used to setting acceleration transducer, and the horizontal test point in drum driven end is for being arranged temperature sensing
Device, the Rotating speed measring point is for being arranged velocity sensor.
8. underground equipment sensory perceptual system according to claim 6, which is characterized in that described multiple without driving roller to be provided with
For detecting the test point of bearing fault.
9. underground equipment sensory perceptual system according to claim 8, which is characterized in that the detection for including without driving roller
Point includes without driving roller left bearing vertical detection point, without driving roller right bearing vertical detection point；Wherein, described to be rolled without driving
Cylinder left bearing vertical detection point is respectively used to setting acceleration transducer and temperature without driving roller right bearing vertical detection point
Sensor.
10. underground equipment sensory perceptual system according to claim 8, which is characterized in that it is described without driving roller be 8.
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