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Refiner

Refiner


JM9E Refiner
Jechen JM9E refiner is developed for the MDF productionline with annual output of 30,000 m3. This machine provides thehighest output per unit power, highest utilization of low-voltage power, andthe highest energy efficiency. Thus, the refiner remains the ideal equipment inthe fiberboard industry.

Development and Debugging ofRefiner Simulation Software
We at Jechen Group have established long-termcooperative relationships with Forestry& Wood Working Mechanical Engineering Technology Center of NortheastForestry University, which is titled as the key laboratory by the Ministry ofEducation, the only science and technology laboratory for biomass materials andis formed based on computer science. In 2008, we implemented the cooperationproject of development and debugging of refiner simulation software.


Implementationof National Key Project
In 2008, we at Jechen Group carried out the project concerning developmentof high-power hot refining technology and energy conservation technology. Our54 inch large refiner, developed in 2010, emerges as the earliest model in China.Also in 2010, we have been involved in the design and trial-manufacture of a 60inch refiner.

M Series Refiner
Naming Rules
The nameof M series refiner comprises the capital letter M and two Arabic numbers.
The Mderives from the naming rules stipulated according to national standards, whilethe two figures included indicate the diameter of grinding disc whose unit isconventionally inch. For the updated models, it is generally to add Englishletters from A to Z at the end of the name of the original models, thus makinga distinction. In case of larger grinding discs can be loaded, there is often aslash followed by another two figures, at the end of the name.


For the M series refiner, M48/50, M52/54, M60, andmore are available. And the M42/44 refiner is upgraded model of JMseries refiner.


Spindle System
Regarding mainshaft bearing structure of refiner, there are typically two kinds in the world,namely, the one made by SUNDS, and the other by Andritz.


The spindle structure by SUNDS was commonly adoptedfor refiner made in China,as it allows the refiner to have wide applications that suit various precisionneeds and different operating environment.


Today, most refiners use the spindle structuredesigned by Andritz, which is becoming increasinglypopular in China.Refiner with this structure is to accommodate special requirements of precisionand operating environment.


The JM series refiner comes with the spindlestructure similar to that of SUNDS, while the M series refiner commonly usesspindle structure designed by Andritz.


Structure
The M48/50 and M52/54 refiners use high precision single rollroller bearings for machines as the front bearings, which provide radialbracing and high centering precision. Self-aligning spherical roller bearing isutilized as the rear bearing. Hydraulic thrust bearing moves together with theaxis.


StructuralFeatures
When runout of the rolling disc occurs due to impactload, the spindle can change its location automatically. This helps bufferstrong vibration to the refiner which may be caused by excess load. Thehydraulic thrust bearing serves to hold the axial grinding force, providinglarge bearing capacity and long service life. The thrust bearing does notrotate but is fixed inside the thrust bearing housing. The thrust disc, whichmoves with the spindle at high speed, provides load capacity in directproportion to the spindle rotation speed. High speed rotation of the thrustdisc helps result in rigid lubricant film between the thrust bearing and thrustdisc. Provided users strictly follow operating instructions, the bearing offerslong life of over five years. Minimum wear and tear of the thrust bearing caneffectively ensure high axial alignment accuracy of the spindle system. Withsimple structure, the spindle of the refiner offers easier installation andmaintenance, more stable performance, longer life and lower maintenance cost.In addition, accurate clearance between grinding discs can be guaranteed.


Grinding Chamber
The large M series refiner is designed with unique grinding chamber which has aside-opening door. This is different from the split type chamber with anup-sliding door. The M series refiner can thus avoid problems involving thespindle arm, maintenance, and replacement of grinding disc, which are commonlyseen in many other refiners.


Disadvantages ofUp-sliding Door Structure
Designers enlarge the axial space inside the grinding chamber, for the purposeof facilitating maintenance and replacement of mechanical seal. However, it isactually difficult to do this due to large size, 100kg heavy weight ofmechanical seal and limited space.


Once the space has beenexpanded inside the chamber, the stuff will come in stock and can not besmoothly discharged. The accumulated materials will then affect the high speedrunning of the rolling disc, adding extra load to the main motor and thusincreasing power consumption.


The expansion of axialspace inside the grinding chamber also leads to extended cantilever length ofthe spindle, which runs counter to the design principle of “ the shorter thecantilever, the better”.


Expanded axial space canalso cause trouble for maintenance and replacement of mechanical seal. Themaintenance men will first need to separate the spiral part from the grindingchamber, and then take the static disk with weight up to one ton out of thechamber. Too much time taken to maintain the machine reduces the productionline efficiency drastically.


Advantages ofSide-opening Door Structure
The side-opening doordesign makes it exceedingly convenient to repair and replace the grinding disc.The stationary disc or stator is mounted on the rotary door, which is jointedtogether with the grinding chamber by means of two rotating shafts. The rotarydoor is in connection with a spiral pipe, under which there is a supportingleg. When the rotary door opens, the spiral pipe and the door revolves aroundthe axis. While the supporting leg serves to protect the shaft from harm due tooverturning moment of the rotary door. It is much easier for your maintenanceand replacement of mechanical seal and grinding disc by first opening the door.With the side-opening door, the grinding chamber comes with more compact andreasonable structure. This can facilitate discharging of stuff from thechamber.


The spindle arm becomes shorter, which reduces rotor bouncesoff the stator due to arm deflection. This helps ensures parallel matingsurfaces of rotor and stator, and also uniform and constant clearance.


Mechanical Seal
There is mechanical seal between the grinding chamber and spindle. Themechanical seal represents the development trend of refiner manufacturing.


Advantages ofMechanical Seal
Due to compact structure of mechanical seal device, the refiner comes withshorter axial length than that of packing seal. This can translates intoimproved load-bearing conditions of the front bearing. With no friction betweenthe spindle and packing, power consumption of the main motor can be largelyreduced. The cooling water filled inside the seal assembly serves to decreasethe heat transmission to the front bearing, greatly enhancing the stability ofthe refiner. What’s more, the mechanical seal has longer life and does notrequire so frequent maintenance as the packing seal.


For mechanical seal,high stand stiffness, high assembling accuracy, high cooling water quality, andforce balance are essential.


Working Principle of Mechanical Seal
The following isabout how the cartridge typemechanical seal works. The rotary ring is attached to the shaft sleeve, whichis fastened to the spindle by means of expansion sleeve. Two O-rings are usedas a seal between the shaft sleeve and the spindle. In addition, the two staticrings on both sides of the rotary ring, under the action of the force of thespring seats below, are pressed onto the side faces of the rotary ring. Thespring seat ensures ideal bonding force applied between the rotary ring andstatic ring as well as excellent seal. The mechanical seal housing is designedwith three water channels, including two inlets and one outlet. One inletchannel is for high pressure water, which prevents the stuff in the grindingchamber from entering into the cavity of the mechanical seal. The cooling waterfrom the other inlet is used for cooling the friction surface of rotary ringand static ring. High water quality is necessary for mechanical seal, for thewater not up to related standards can affect the service life of mechanicalseal.


Refiner DiscClearance and Grinding Pressure Adjustment Mechanism
Clearance between grinding discs and grinding pressure are two factors affectingthe refining quality. In case of excessive clearance or too low pressure, therewill be insufficient refining and high coarse fiber content. When the clearanceis too small or the pressure too high, the fiber may be over pressurized, orshortening of fiber will occur. And you may even discover powder fiber.Therefore, it is important to keep proper and constant clearance between discsand grinding pressure so as to ensure high productivity and low powerconsumption.


Methods for Application of Grinding Force
The grindingforce can be applied either hydraulically (typical of SUNDS) or mechanically(typical of Andritz).

Firstly, most refiners in China use the method of applying grinding forcehydraulically. In this case, the grinding force is liable to frequentfluctuation which is caused by load change. This may further lead to inaccurateclearance between the grinding discs. Hence, it is important to adjust theforce regularly in the process of grinding, so that we can guarantee precisionof the clearance is kept within prescribed range. Theoretically, there is abalance of the hydraulic force applied to the spindle and the opposing force ofthe load on the rolling disc. However, due to varying materials, feeding speed,feed quantity and vapor pressure, the load the rolling disc bears is constantlychanging. While through the use of relief valve, the hydraulic action remainsthe same. Thus, the two forces are in an unbalanced state in practicaloperation. When the load is larger than the hydraulic action, the spindle willmove back. An enlarged gap thus caused means insufficient grinding force.Contrarily, the gap will become smaller. That is why the gap constantly varieswithin a range.

And M series refiner is typical of applying grinding force mechanically. Theuse of nut lifter enables axial movement of spindle, while changing thedistance between the rotating disc and stationary disc. Thus, the grindingforce and the clearance between grinding discs can also be adjusted. Driven bydouble-speed motor, the nut lifter which is mounted on the support plate hasits lead screw fixed and the worm couple move axially. Then the support plate,fastened to the thrust bearing housing, makes the spindle achieve axialmovement.

Refiner

The worm gear and leadscrew, which are used to make the spindle move axially, have auto-lockfunction. Therefore, once the initial clearance is set, the spindle will stayat the same position. This can prevent clearance fluctuation caused by loadvariation.


The double-speed motorof the clearance adjustment mechanism enables both high speed and low speedadvance and retreat of grinding disc. When the clearance adjustor works, themagnetic clutch is energized to offer regulation of spindle advance andretreat. As soon as the clearance between grinding discs has been set, theclutch stops working due to loss of power, and the double-speed motor detachesfrom the gear set. At this time, you can make fine adjustment of the clearanceby turning the hand wheel.


A sensor is used tomeasure the clearance between the grinding discs, and the value obtained isonly for the clearance when the discs have zero wear and tear.


The grinding chamber isinstalled onto the machine base through the use of three locating keys. Thespindle goes through the front and rear bearing seat holes, with a gland ontop. The gland is designed with spring guide keys, which can eliminate theradial clearance between front and back bearing sleeves as well as betweenbearing seats. This helps buffer vibration caused by load change and reducesthe impact of load variation on the spindle system.


Application
Jechen refiner, together with hot refiningtechnology, is applied to material preparation or making qualified fiber forthe whole MDF production line. In addition, refiner and hot refining technologyare also crucial in making MDF and paper, and have found extensive applicationsin pulping and papermaking industry.


Technical Specifications



Main Data of Refiner

Series Number

Technical Parameters

BM119/15H(JM9H)

BM119/15(JM38)

BM1111/15(JM42F)

BM1111/15(JM42A)

BM1111/15(JM42FC)

BM1111/15(M42/M44)

BM1112/15(M48/M50)

BM1113/15(M52/M54)

1

Bone-dry fiber output(t/d)

60~100

90~120

180~200

200~250

200~250

200~250

300~320

400~420

2

Main part of refiner

Main motor power (Kw)

480

1000/1250 (optional)

1000/1250(optional)

1600/1800/2000 (optional)

1600/1800/2000 (optional)

1600/1800/2000 (optional)

3300

5000

Main motor voltage(V)

380

10000

10000

10000

10000

10000

10000

10000

Grinding disc diameter (mm)

φ900

φ950(38")

φ1066.8(42")

φ1066.8 (42")

φ1066.8 (42")

φ1066.8 (42") φ1117.6 (44")

φ1219.2 (48") φ1270 (50")

φ1320.8 (52") φ1371.6 (50")

Clearance adjusting style

Cylinder

Cylinder

Cylinder

Cylinder

Cylinder

Cylinder

Mechanical

Mechanical

Method of connection between spindle and rolling disc

Conical surface single key

Conical surface single key

Conical surface single key

Conical surface single key

Conical surface

Conical surface multiple keys

Conical surface single key

Conical surface single key

Grinding disc rotation speed (r/min)

1500

1500

1500

1500

1500

1500

1500

1500

Sealing type

Packing seal

Packing seal

Packing seal

Packing seal

Packing seal

Mechanical seal

Mechanical seal

Mechanical seal

Sealing water pressure (MPa)

~1.2

~1.2

~1.2

~1.2

~1.2

~1.2

~1.2

~1.2

3

Feeding screw

Screw diameter (mm)

φ305 (12")

φ305 (12")

φ355 (14")

φ405 (16")

φ355 (14")

φ405 (16")

φ455 (18")

φ505 (20")

Motor power (Kw)

132

132

250

315

315

355

450

600

Rotation rate (mm)

~83

~83

~107

~107

~107

~107

~92

~94

4

Backspray preventor

Cylinder bore (mm)

φ300

φ300

φ300

φ300

φ300

φ300

φ300

φ300

Cylinder pressure(MPa)

0.2~0.5

0.2~0.5

0.2~0.5

0.2~0.5

0.2~0.5

0.2~0.5

0.2~0.5

0.2~0.5

5

Size of cylinder for cooking (top diameter× bottom diameter × height)

φ680×φ880×6920

φ680×φ880×5920

φ780×φ980×8000

φ780×φ980×8000

φ780×φ980×8000

φ780×φ980×8000

φ1100×φ1300×10000

φ1100×φ1300×10000

6

Max. saturated vapor pressure (MPa)

1.2

1.2

1.2

1.2

1.2

1.2

1.2

1.2

7

Cooking time for wood chips(min.)

5~10

5~10

5~10

5~10

5~10

5~10

5~10

5~10

8

Feeder

Rotation rate(r/min)

5.7

5.7

5.5

5.5

6.1

8.2

11.5

16.5

Motor power(Kw)

7.5

7.5

11

11

15

15

22

30

9

Conveying screw

Screw diameter (mm)

φ270

φ280

φ340

φ340

φ340

φ340

φ405

φ455

Revolution speed of screw (r/min)

60

60

65

65

65

75

83.3

85.2

Motor power (Kw)

11

18.5

18.5

18.5

22

30

55

75

10

Band screw

Screw diameter (mm)

 

 

 

 

 

φ390

φ455

φ590

Rotation rate of screw (r/min)

 

 

 

 

 

580

650

650

Motor power (Kw)

 

 

 

 

 

22

30

37

11

Installed power (Kw)

~600

1200~1450

1200~1450

2000~2500

2000~2500

2000~2500

~4000

~4000

12

Machine weight (Kg)

~25000

~27000

~35000

~38000

~38000

~45000

~85000

~90000




Jechen isa China refiner manufacturer and supplier. We offer refiner, and multi-layerparticle board hot press, MDF steaming production line. Our high qualityproducts are offered at competitive prices. Jechen islocated in China, and the full chain of manufacturing single board machine, MDFand HDF production line can be completed in China, even in one city. Lowermanufacturing cost saves your purchasing cost. The more details of each productare shown on the page with description.


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