HOSCH Sprung Blade Scraper Type B6-C · PDF fileHOSCH Sprung Blade Scraper Type B6-C removes,...

INSTALLATION &OPERATING INSTRUCTIONSINSTALLATION & OPERATINGINSTRUCTIONS

HOSCH SPRUNG

BLADE SCRAPER

TYPE B6-C

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Installation & Operating Instructions Type B6-C – 02/12

Range of application

UseBelt conveyor systems tend to soil as a result of bulk material sticking to the return belt and falling down. The HOSCH Sprung Blade Scraper Type B6-C removes, to the extent possible, sticking material from conveyor belts, before it enters the conveyor line. The B6-C is installed on the return belt after the discharging drum of the conveyor system.

General operating conditionsThe HOSCH Sprung Blade Scraper Type B6-C can be used as follows:● for belt widths from 650 up to 1.400 mm, in standard design as in the dimension sheet,● for belt widths from 1.500 up to 3.200 mm, with double assembly carrier locking devices and support nuts● for belt speeds < 3.0 m/s, in standard design (with long elements and straight blades)● for conveyor belts of rubber or PVC with a smooth cover plate and a hardness of 60 to 65° Shore A● for vulcanized belt splices, in standard design. The cover plate hardness in the junction area may deviate

from the undisturbed section by approx. ±5° Shore A. The junction and patched areas in the belt must be level and undamaged to enable a proper function of the scraper.

● for conveyor belts with mechanical belt splices (clamps), only with special blade/element combination and special blade material (contact HOSCH).

● in a temperature range of max. –20 to +80° C● by free, undisturbed discharge of the removed material● scraper must be fixed to sufficiently twist-resistant, low-vibration structural components or consoles● scraper may only be used in non-explosive environments according to the Directive 2014/34/EU.

Optional operating conditionsThe HOSCH Sprung Blade Scraper Type B6-C may only be used with special accessories in the case of the following operating conditions:● Reversing operation – Accessories: Disengaging device (in some cases, the execution with V-shaped blades

240mm and short elements may also be suitable, please contact HOSCH) ● For belt speeds ≤ 6.0 m/s, with Z-shaped blades, short elements, double assembly carrier locking devices

and support nuts● Special cleaning conditions – Accessories: elements and blades in special execution (Please contact

HOSCH)● Special installation position –Installation as a pre-scraper on the head-pulley also possible (Please contact

HOSCH)● Explosive environments - Accessory: Earthing cable (if the scraper is used in explosive environments

according to Directive 2014/34/EU, the ATEX execution of the scraper is to be used) ● Structural obstacles in the installation area – Accessories: offset profiles (see extra sheet “Execution with

offset profiles”)● Special documents are available for HOSCH Sprung Blade Scrapers Type B6-C with special accessories.

NoteThe HOSCH Sprung Blade Scraper Type B6-C must not be used in other operating conditions without the prior approval by HOSCH.

The contents of this document may be subject to technical modifications

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DesignThe HOSCH Sprung Blade Scraper Type B6-C is a so-called main scraper. Characteristic features are the single row, spring-bearing cleaning blades. By means of the plastic skirts, the scraped material is deflected forwards.


Functional Description

1. Assembly carrier end section

2. Spindle M42 (M60)

3. Element

4. Cleaning blade

5. Skirt

6. Assembly carrier midsection

7. Assembly carrier locking device

8. Parallel elasto-mount

9. Nut M42 (M60)

10. Assembly carrier flange

FunctionThe essential items of the scraper are its torsion spring units (3) – also called elements - fitted with cleaning blades (4). During continuous operation, their construction guarantees the permanent and constant contact with the belt surface. The blades usually have a scraping edge made from tungsten carbide. The elements are fitted with rubber torsion springs to avoid any obstacle on the belt surface. For poor belt surfaces, or in the case of mechanical belt junctions, special blade/element combinations and special blade material are utilized. In variance to the standard execution, these show a modified blade geometry and a modified overall height. The elements are screwed down onto the assembly carrier (1). In the scraper execution B6-C, the assembly carrier is divided. The assembly carrier end sections (6) are screwed onto both ends of the assembly carrier midsection (1). As an option, offset profiles can be screwed vertically between the assembly carrier midsection and the assembly carrier end sections. In this way, disruptive profiles can avoid the belt construction for example.

The scraper is screwed to the belt-supporting structure by way of the so-called mounting. The essential item of the mounting is the parallel elasto-mount (8). This is fitted with rubber torsion springs, and compensates for any jolts that may occur, or any vibrations from the conveyor belt installation. The parallel elasto-mounts, together with the elements, hold the scraper under constant tension. The elasto-mounts are mounted and screwed onto threaded spindles (2). The threaded spindles allow infinitely variable positioning of the scraper to the belt.

The assembly carrier locking device (7) connects the scraper with the parallel elasto-mount. It can be adjusted both up and down, and enables flexible adaptation of the scraper to the belt construction, bearing the hole-pattern in mind. The assembly carrier locking device is screw-connected with the assembly carrier end section by way of two cutting ring screws.

The assembly carrier should always be tensioned as short as possible by both of the assembly carrier locking devices (arms of the elasto-mount always in the belt direction).

In order to stabilize the mountings, the free ends of the spindles can be fixed on the conveyor structure by means of optional support nuts.


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F

100

H

A

G

100A

B

CDE

RS

F100A

J

KML

N

F

100A

Q

P

PCPM

PC

O

1200 - 1400 1500 - 2000

8 8

240 250

45 75

45 75

70 75

217 217

185 185

25 25

M42 x 4,5 M60 x 5,5

400 450

Ø 18 Ø 22

190 210

140 140

650 - 1050

8

230

45

45

70

217

185

25

M42 x 4,5

400

Ø 18

190

140

8

50

2200 - 3200

8

260

90

90

90

240

185

25

M60 x 5,5

450

Ø 22

210

140

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

≥ 80 ≥ 118

≤ 290 ≤ 328

≥ 123 ≥ 150

≤ 333

≥ 80

≤ 290

≥ 123

≤ 333 ≤ 360

≥ 118

≤ 328

≥ 150

≤ 360


Device layout / Characteristics

Index

Rmin

Smin

Belt width (mm)

Dimension table

Spindle positioning andinstallation dimensions

Installation area forthe parallel elasto-mount with standingor hanging assemblycarrier locking devices.

Element pre-tensionPM = torsion springcentre point

Scraper alignmentPC - Assembly carriercentre point

List of toolsThe following tools are required for the installation and maintenance of the scraper (minimum requirements):2 pcs. 19 mm ring/open-end spanner;2 pcs. 24 mm ring/open-end spanner;(2 pcs. 30 mm ring/open-end spanner); 1 pc. 36 mm open-end spanner 36;1 pc. 65 mm open-end spanner;(1 pc. 75 mm open-end spanner);1 pc. measuring tape 2 m;1 pc. hand-brush; 1 pc. fitter's square 160x250;1 pc. wire brush; 1 pc. one-hand right-angle grinder; 1 pc. marking pen or chalk

NoteBefore installation and commissioning of the scraper, the conveyor system and the conveyor belt must be checked for proper function and condition, e.g. mistracking, belt tension, round running of drums, grooved or patched belt surface, vibrations. In the case of thick layers of sticking material (s > 3 mm) a pre-scraper should be installed.In the case of special operating conditions (reversing operation, runback, highly damaged belt surface, vibrations, etc.), the scraper must be equipped with the corresponding accessories.Please contact HOSCH.


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General Danger Notice


● Before carrying out installation or maintenance work on HOSCH Sprung Blade Scrapers, ensure that the conveyor belt has been stopped and “locked-off”. Do not begin any work that has not been previously authorised by a responsible works manager and co-ordinated with all the departments involved (such as electrical engineering, safety departments, production department, operation department). Protective cloth-ing, in particular safety boots, gloves, helmet and protective glasses are compulsory.

● An authorised work permit from the relevant manager must be obtained prior to any welding and cutting work. Make sure that appropriate fire extinguishing devices are available.

● When working at height, provide safety devices, for example scaffolds, railings, guard nets, safety belts. The devices must have been installed or inspected by a specialised company and released, as fit for work.

● Prior to starting work, the serviceman is to consult the person in charge of site safety and establish the conveyor environment as well as possible specific security instructions.

● Prior to operating the scraper, ensure that the site is completely cleared. All equipment or parts, such as scaffolds, lifting gears, tools etc. should be removed from the area prior to restarting the conveyor belt. Guards etc. that may have been dismantled to ease the installation/maintenance must be refitted.

● HOSCH Sprung Blade Scrapers are generally equipped with shock absorbing elasto-mounts. During the operation, unexpected bouncing movements may occur. Be aware of the nip points! The site operator should guard the mountings to prevent accidental contact.

● The blade cleaning tips are already sharp when delivered. As the risk of injury during installation or mainte-nance is very high, protective clothing is compulsory. Prevent the scraper from unintentional pivoting.

● Due to the friction occurring during operation, the blade tips are likely become very hot. Touching them immediately upon stopping the belt can lead to serious burns.

● The contact between the blades and the running of the conveyor belt can create electrical charges, sparking may also occur through discharge. Be cautious!

● Mineral or metallic particles may collect on the belt surface and cause sparking when passing the blades.

● All scraper parts, especially the components situated in the product flow, are subject to extreme wear. The wearing of the component material may cause sharp edges. The risk of injury is high if this occurs.

● The weakened structures of worn parts are likely to break. To guarantee the personnel and conveyor safety, these parts have to be replaced with new ones.

● Scraper systems are exposed to high dynamic stress. Therefore, all screwed connections are to be checked and secured before each commissioning and upon each maintenance. Security elements (spring washers, counter nuts) should not be re-used. They must be replaced by new parts. In case of mechanical damage e.g. corrosion, new parts are to be installed.

● Only original, genuine HOSCH parts should be used.


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100

≥ 350

PA

PB

100A

PC

B

PB


Installation

1. Determining the installation position

PA : Run-off point (point wherebelt runs off the pulley)

PB : Contact point of the bladeswith the belt

The blade tips are to be positioned 100 mm after the run-off point (PA) at point (PB). Both points are to be marked on both sides of the frame construction. Make sure that the clearance behind the scraper to the next components, e.g. roller or chute is sufficient. Minimum space requirements = 350 mm.

2. Determining the assembly carrier centre point

PB : Contact point of the bladeswith the belt

PC : Assembly carrier centrepoint

A : 8 mm

Belt width: 650 -1.050 mmB : 230 mm

Belt width: 1.200 - 1.400 mmB : 240 mm

Belt width: 1.500 - 2.000 mmB : 250 mm

Belt width: 2.200 - 3.200 mmB : 260 mm

Starting from point (PB) the centre point of the assembly carrier (PC) is to be determined at the frame construc-tion using measures A and B. The measures are always to be marked parallel and vertically to the belt direc-tion.


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100

PC

BV V

VW

100

Q(P

)O

(N)

FPC


Installation (continued)

If the installation is carried out at a closed supporting structure, e.g. in the case of lateral chute plates, an open-ing must be provided for the scraper. The opening must be parallel and vertical to the belt direction. The open-ing must be dimensioned in such a way that the scraper with the pre-assembled elements and blades can be inserted from the side.

The spindles are installed vertically to the belt at distance F from the assembly carrier center point. The spindles may be installed in hanging (preferably) or standing position. The measures O and Q are the max. assembly range, N and P are the min. assembly range depending on the installation of the assembly carrier locking devices (see illustration in dimension table).The position of the spindle base is to be selected in such a way that it can be fixed to stable, twist-resistant components of the supporting structure such as sectional steel beams.

4. Determining the spindle position


F : 217 mm (240 mm*)N : 80 mm (118 mm*)O : 290 mm (328 mm*)P : 123 mm (150 mm*)Q : 333 mm (360 mm*)

* For belt widths from1.500mm up to 3.200mmwith spindle M60– see dimension table

3. Installation opening


Belt width: 650 - 1.050 mmB : 230 mm

Belt width: 1.200 - 1.400 mmB : 240 mm

Belt width: 1.500 - 2.000 mmB : 250 mm

Belt width: 2.200 - 3.200 mmB : 260 mm

V : min. 100 mmW : min. 240 mm


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ML

K



If the spindles cannot be fixed to the supporting structure sections directly, appropriate intermediate consoles must be provided (not included in scope of supply). When assembling spindles, elasto-mounts and assembly carrier locking devices, make sure they are installed in such a way that sufficient space (approx. 90 mm) is available on the spindle for tensioning the scraper against the belt. The assembly carrier locking devices can be mounted in steps of 35 mm variably to the elasto-mount.

Assemble the assembly carrier midsection and the assembly carrier end sections using the supplied fastenings. Assemble the elements and the blades as shown in detail "X": screw the elements and the blades hand-tight to the assembly carrier midsection. Next align all blades to a uniform, average height level and tighten the screws. The blades should not touch each other (gap 1-2mm). (Note: To align the blades, one may use a string)

5. Mounting the spindle, support and locking device


K : Ø18 mm (Ø22 mm*)L : 190 mm (210 mm*)M : 140 mm

* For belt widths from1.500mm up to 3.200mmwith spindle M60– see dimension table

6. Pre-assembling and checking the assembly carrier

X

Assembly carrier end section

Assembly carriermidsection

FasteningsFastening plate

Blade Element

SkirtDetail "X"


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= =

A

A 4

2

1

3

=

1

2

3

RS

PM PB



Insert the pre-assembled assembly carrier in the assembly carrier locking devices. Spindle up the elasto-mounts on both sides evenly until the scraping edges have slight contact with the belt and the assembly carrier is paral-lel (1) to the belt surface. Then center the assembly carrier (2) to the belt. Turn the assembly carrier until the assembly carrier flanges are parallel and/or vertical (3) to the belt. Finally arrest the assembly carrier by tightening the cutting ring screws. If necessary, adjust the height of the blades to the existing belt contour until they contact the belt without any gap (4).

Mark the position of the untensioned scraping edges (1) with a chalk line (PB) on the belt. Spindle up the elasto-mounts evenly on both sides (2), while pulling back the elements manually (3). Continue the tensioning procedure until the distance S (4) between the angle and the scraping edges is reached. For that, place the angle at point PM = center of element torsion spring. Alternatively, you can use the measure (S - R) = 42 mm. Pull back the scraper again and check the pre-tension measure, then tighten the spindle nuts.

8. Pre-tensioning the scraper

7. Aligning the assembly carrier

R : 8 mm S : 50 mm

PM : centre of element torsionspring

PB : contact point of the bladeswith the belt

Section A-A


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Check all fixing elements of the scraper, re-tighten and secure screws (1). Secure locknuts at elasto-mounts. Check function and free motion of all scraper components. Check assembly using the installation checklist (2).Tip: Assembly carrier end sections that jut out over the passage way can be cut off up to the mounting.

Check if the cleaning function of the scraper is OK. If necessary, readjust the height of individual blades. Check if the scraper works smoothly and without vibrations. Check if the loading width of the belt corresponds to the cleaning width of the scraper. Belt junctions, patches or other defects must pass the scraper without causing any problems. Check system for mistracking and runback.In order to stabilize the mountings, the free ends of the spindles can be fixed on the conveyor structure by means of optional support nuts (see the additional sheet to the installation instructions: Execution with spindle support)

9. Checking the installation

Minimum period of trial runwith material = 0.5 hrs.

For belt width from 1.500 upto 3.200mm(see the additional sheet to theinstallation instructions:Execution with spindle support)

10. Trial run with material

*Spindle support nut


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Maintenance and Service

To maintain its performance, the HOSCH Sprung Blade Scraper Type B6-C must be inspected and serviced regularly.

First inspection:Directly after the first full working day of a scraper, a visual inspection should be carried out. In this inspection, the function of the device, the cleaning efficiency, the material discharge and the working behavior of the scraper should be checked. In addition to that, the belt surface, the belt junctions and patches are to be checked.

Follow-up inspections:The intervals for follow-up inspections are variable and mainly depend on the operating conditions of the scraper. Generally, the inspections should be carried out at intervals of 4 weeks. If necessary, the inspection intervals must be shorter. The follow-up inspections include the same steps as the first inspection. Additionally, the degree of wear of the blades must be assessed, and any material sticking to the scraper must be removed, if necessary. When cleaning the scraper, make sure not to damage the anti-corrosion coat or the scraping edges of the blades.CAUTION – Damaged tungsten carbide parts of the blades can damage the belt surface.

Maintenance:Depending on the degree of wear, the scraper must undergo a regular service inspection. A maximum of 4.000 operating hours is a very general value for the time between two service inspections. Depending on the type of installation and the material conveyed, this value may differ greatly, however. Please coordinate the service intervals with HOSCH.

The following work is to be carried out:● Cleaning of all scraper components● Disassembly of the assembly carrier● Functional check of all components● Assessment and, if necessary, repair of anti-corrosion coat of all components● Assessment of the degree of wear of all components● Replacement of worn-out or damaged parts by original parts● If used modules are reinstalled, the scraping edges must be rounded, otherwise the belt surface may be

damaged● Installation and re-adjustment of the scraper according to the installation & operating instructions.

Wearing partsThe blades are subject to constant wear. They must be replaced if the height of the tungsten carbide tip is less than or equal to 2mm. All rubber springs are subject to material fatigue. For this reason it is recommended that components equipped with torsion springs, such as parallel elasto-mounts and blades with a low tungsten carbide wear should be replaced after approx. 8.000 operating hours in order to maintain a good operating result and plant safety. New screw securing elements must be installed in each service inspection.

HOSCH ServiceThe required inspection and service intervals can be coordinated with HOSCH's Service Department if requested. HOSCH service staff is available world-wide to carry out the work. Additionally, HOSCH offers its customers training seminars on the selection, installation, inspection and service of its belt conveyor cleaning systems.


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HOSCH in the United Kingdom

The HOSCH Group

HOSCH Equipment (India) PVT Ltd.Calcutta, Indiae-mail: [email protected]

HOSCH Italia S.R.L.Pontecagnano, Italye-mail: [email protected]

HOSCH Techniki Transportowe Polska Sp. z o.o.Wrocław, Polande-mail: [email protected]

HOSCH Fördertechnik (SA) (Pty) Ltd.Johannesburg, South Africae-mail: [email protected]

HOSCH Iberia S.R.L.U.Barcelona, Spaine-mail: [email protected]

HOSCH COMPANYPittsburgh, USAe-mail: [email protected]

HOSCH International Pty Ltd.Perth, Australiae-mail: [email protected]

HOSCH do Brasil Ltda.Belo Horizonte, Brazile-mail: [email protected]

HOSCH France S.A.R.L.Limoges-Fourches, Francee-mail: [email protected]

HOSCH Schweiz GmbHRotkreuz, Switzerlande-mail: [email protected]

HOSCH (G.B.) Ltd.97, Sadler Forster Way, Thornaby, Teesside, TS17 9JYTel: 01642 751 100, Fax 01642 751 448e-mail: [email protected], web: www.hosch.co.uk

HOSCH Hellas Monoprosopi E.P.E.Thessaloniki, Greecee-mail: [email protected]

HOSCH Fördertechnik GmbHRecklinghausen, Germanye-mail: [email protected]

HOSCH Austria GmbHVienna, Austriae-mail: [email protected]

HOSCH Asia PLTPuchong, Malaysiae-mail: [email protected]

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©2018 HOSCH Fördertechnik GmbH

No part of this publication may be reproduced, transmitted, transcribed, stored in any retrieval system or translated into any human or computer language by any means or in any form, without the prior written permission of HOSCH Fördertechnik GmbH. Contravention of the owner's copyright may also reduce the ability of HOSCH Fördertechnik GmbH to provide effective support for its equipment.

HOSCH Fördertechnik GmbH reserves the right to make changes without notice to both this document and to its products described within this document. Nothing in this publication represents any contractual or other commitment on the part of HOSCH Fördertechnik GmbH and should not be taken as such. All possible care has been taken in the preparation of this publication.

However, if you find any errors or would like to make suggestions for improvement then write to HOSCH Fördertechnik GmbH.


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