Roller Mills

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Roller Mills

Increasingly stringent requirements being made of product properties mean that comminution processes in the bulk materials industry today must satisfy significantly higher standards.

Requirements that SIEBTECHNIK roller mills for applications in the mineral and metal industry, the food industry through to the chemical and pharmaceutical industry are well up to.

Our roller mills are capable of comminuting very hard through to soft products homogeneously and with a minimum fine material content, depending on requirements, to a reduction ratio of between 1:5 and 1:1.5 and our double-roller mills to a Mohs hardness of up to approx. 8.5.

Single-roller mill

With the single-roller mills, brittle, soft to medium-hard materials can be reduced in size with a reduction ratio of approx. 1:5 to 1:5.

The stepped arrangement of the crushing jaws on the crushing wall enables any material rolling off being minimised, so that, compared to the double-roller mill, coarser material can be drawn in.

Double-roller mill

The doubel-roller mills can be used to crush brittle materials such as ore, slag, glass, ceramics, battery materials, limestone, … up to a Mohs hardness of approx. 8.5. Depending on the material and size of the crusher, comminution ratios of 1:2, … , 1:5, max. up to approx. 1:20 can be realized.
Comminution mainly takes place by means of a pressure and shear stress, between two counter-rotating grinding rollers.

Our laboratory roller mills have an innovative app control, a continously adjustable roller gap, reversible overload protection, high fore transmission to the moving grinding roller and a dust extractor connection. Via the flap-open upper crusher housing the cleaning and inspection of the crushing chamber is made easy. And with grinding rollers made from cast steel, tungsten carbide or aluminium oxide, low-contamination comminution is guaranteed.

Operating Behavior & Mechanical Characteristics Single-roller mill

Comminution occurs between a rotating roller and a flexibly supported crushing wall mainly through compressive and shear stress. The fed material is drawn in through the rotating roller by means of shear and compressive stress until it can pass through the smallest opening between the roller and crushing wall.

The stepped arrangement of the crushing jaws on the crushing wall enables any material rolling off being minimised, so that, compared to the double-roller mill, coarser material can be drawn in.

In the model with toothed crushing strip, the feeding behaviour is additionally improved by appropriately formed crushing strips, especially with moist feed materials.

The throughput of the single-roller mill is determined decisively by the final grain size required and thus by the gap width between the rollers.

The single-roller mill has a crushing roller provided with crushing strips. The crushing strips can be lined to improve the feeding behaviour, which additionally improves the throughput with a final product that becomes coarser. The crushing wall with mounted crushing jaws is supported by springs, so that protection is ensured against overloading and minor foreign bodies. It can also be adjusted via threaded spindles to set the end product fineness.

Technical specification Single-roller mill

Single-roller mill		EW 30/25	EW 30/25-L	EW 30/40	EW 30/60
Dimensions (W x H x D)	mm	675 x 500 x 1360	1000 x 1500 x 925	850 x 1100 x 2120	1100 x 1160 x 2300
Weight	kg	480	570	590	820
Motor	kW	5.5	5.5	7.5	9.2
Roller size (Ø x W)	mm	Ø300 x 250	Ø300 x 250	Ø300 x 400	Ø300 x 600
Gap width, min. - max.	mm	5 - 30	5 - 30	5 - 30	5 - 30
Max. feeding size	mm	120	120	120	120
Throughput	kg/h	500 - 2500	500 - 2500	750 - 3500	1000 - 4500
The throughput is dependent on the size of the discharge opening, the bulk weight and the size reduction behaviour of the crushed material. Fineness is decisively determined by the discharge opening set. Subject to technical changes.

Single-roller mill		EW 50/40	EW 50/60	EW 65/40	EW 65/60
Dimensions (W x H x D)	mm	1300 x 1100 x 3400	1750 x 1100 x 3400	1300 x 1400 x 1620	1660 x 1400 x 2480
Weight	kg	1410	2150	2450	3720
Motor	kW	11	15	15	18.5
Roller size (Ø x W)	mm	Ø500 x 400	Ø500 x 600	Ø650 x 400	Ø650 x 600
Gap width, min. - max.	mm	5 - 60	5 - 60	5 - 60	5 - 60
Max. feeding piece size	mm	200	200	300	300
Throughput	kg/h	750 - 5500	1000 - 7500	750 - 5500	10007- 500
The throughput is dependent on the size of the discharge opening, the bulk weight and the size reduction behaviour of the crushed material. Fineness is decisively determined by the discharge opening set. Subject to technical changes.

Operating Behavior & Mechanical Characteristics Double-roller mill

Crushing is done between two counter-rotating rollers mainly through compressive and shear stress. The smooth crushing rollers are arranged on opposite sides, one of them being fixed to the housing and the other arranged flexibly. The flexibly appointed crushing roller can be moved via a spindle in order to thus set the opening between the two rollers infinitely variably. To protect the crusher from minor foreign bodies, the flexible roller is supported by spring packages that can be adjusted to meet requirements in the prestressing force. The two crushing rollers are driven by a V-belt drive.

The double-roller mills are executed by us in two versions: In the laboratory version, the machine is equipped with a tamper-proof feeding funnel, the base frame with integrated control system and the safety-monitored collecting box.

For installation of the double-roller mills in plants, there is also a version available without these additional attachments, so that simple integration is possible.

In the laboratory version, our roller mills have:

Innovative app control

Standard Operating Procedures (SOP)
Roller gap display
Accessing the operating instructions
Direct spare parts inquiry
Sample/machine data exportable in csv format
Update-friendly app and firmware

Continuously adjustable roller gap
One of the two rollers is fixed in position, while the second roller can be adjusted via a spindle. The roller gap setting is displayed via the app.
The zero point can be reset accordingly when the rollers are worn.

Reversible overload protection
Spring packs give the moving roller the possibility to avoid damage in the event of comparatively small non-breakable materials.

Easy cleaning and inspection of the crushing chamber
via the flap-open upper crusher housing High force transmission to the moving grinding roller by installation on a rocker, high compressive forces can be generated in the roller gap.

Dust extractor connection
in the feed hopper or below the rollers

Low-contamination comminution with grinding rollers made from
cast steel, tungsten carbide or aluminum oxide

Technical specification Single-roller mill Double-roller mill

Zweiwalzenmühle		WS 250x150	WS 400x200	WS 400x400	WS 600x400	WS 600x800
Abmessungen (B x H x T)	mm	675 x 500 x 1360	850 x 1100 x 2120	1100 x 1160 x 2300	1300 x 1100 x 3400	1750 x 1100 x 3400
Gewicht	kg	345	1280	1920	3000	5500
Motor	kW	3	2 x 5,5	2 x 7,5	2 x 15	2 x 22
Walzengröße (Ø x B)	mm	Ø250 x 150	Ø400 x 200	Ø400 x 400	Ø600 x 400	Ø600 x 800
Spalt, min. - max.	mm	0,2 - 5,0	0,5 - 15	0,5 - 15	0,5 - 15	0,5 - 15
Max. Aufgabestückgröße	mm	12	20	20	50	50
Durchsatzmenge	kg/h	50 - 2000	75 - 6000	150 - 10000	180 - 10000	360 - 17000
Die Durchsatzmenge ist abhängig von der Größe des Austragsspaltes, dem Schüttgewicht und dem Zerkleinerungsverhalten des Brechgutes.
Die Feinheit wird maßgeblich durch den eingestellten Austragsspalt bestimmt. Technische Änderungen vorbehalten.

Zweiwalzenmühle			WS 250x150 - L	WS 400x200 - L
Abmessungen ( B x H x T)		mm	1113 × 1368 × 676	1916 × 1547 × 950
Gewicht		kg	479	973
Antriebsleistung		kW	3	2 x 5,5
Brechwalzenabmessungen	( Durchmesser x Breite)	mm	Ø 250 × 150	Ø 400 × 200
Austragsspalt		mm	0,2 - 5,0	0,5 - 15,0
Aufgabekorngröße (max.)		mm	12	20
Durchsatzmenge		kg/h	50 - 2000	75 - 6000
Auffangbehältervolumen		dm³	30	40
Betriebsspannung			400 V, 3/N/PE, 50 Hz
Die Durchsatzmenge ist abhängig von der Größe des Austragsspaltes, dem Schüttgewicht und dem Zerkleinerungsverhalten des Brechgutes. Die erhaltene Endfeinheit wird maßgeblich durch den eingestellten Austragsspalt und dem Zerkleinerungsverhalten des Materials bestimmt.
Technische Änderungen vorbehalten.