DTII Belt Conveyor Screw Idler for Mining Machinery

DTII Belt Conveyor Screw Idler for Mining Machinery

The DTII Belt Conveyor Screw Idler is a specialized component in the DTII conveyor system, an advanced version of the TD75 standard, widely used in mining, coal, ports, and other heavy industries. Positioned on the return side (underside) of the conveyor, these idlers feature a spiral or helical design on the roller surface, typically made of steel or rubber, to clean sticky material from the belt and prevent buildup.

The screw idler’s unique spiral structure scrapes off debris like coal dust, mud, or sticky aggregates, ensuring the belt remains clean and reducing the risk of misalignment or damage. Built to withstand harsh mining conditions, these idlers enhance conveyor efficiency, reduce maintenance, and extend belt life [,]. This page explains what screw idlers do, where they’re used, how to install them, what users say, and answers common questions, all in plain language to help you decide if they’re right for your conveyor system.

DTII Belt Conveyor Screw Idler for Mining Machinery Dimensions:

Explanation: The fasteners connected to the intermediate frame are included in this assembly drawing.Unit: mm

Belt width B	Roller				E	A	H1	P	Q	d	Drawing No
	D	L	Drawing No	Bearing
800	108	950	DTⅡGL2111	4G204	1142	1090	166	145	90	M12	DTⅡ03C3121
			DTⅡGL2311	4G305							DTⅡ03C3123
1000		1150	DTⅡGL2312		1342	1290	176	150		M16	DTⅡ04C3123
	133		DTⅡGL3312				188.5				DTⅡ04C3133
1200		1400	DTⅡGL3313		1592	1540	198.5				DTⅡ05C3133
			DTⅡGL3413	4G306							DTⅡ05C3134
	159		DTⅡGL4313	4G305			211.5				DTⅡ05C3143
			DTⅡGL4413	4G306							DTⅡ05C3144
1400	133	1600	DTⅡGL3314	4G305	1800	1740	208.5				DTⅡ06C3133
			DTⅡGL3414	4G306							DTⅡ06C3134
	159	1600	DTⅡGL4314	4G305			221.5				DTⅡ06C3143
			DTⅡGL4414	4G306							DTⅡ06C3144

DTII Belt Conveyor Screw Idler for Mining Machinery Features:

The DTII Screw Idler is designed to support the return side of the conveyor belt while actively cleaning sticky material, ensuring smooth operation and minimal maintenance in rugged mining environments. Here’s what it offers:

1. Spiral Cleaning Design

   • Features a helical or spiral surface (steel, rubber, or polyurethane) that scrapes sticky material like coal dust, mud, or aggregates from the belt.

   • Prevents material buildup, reducing belt misalignment and wear.

2. Durable Materials

   • Roller tubes made of Q235 steel (equivalent to SS400/JIS G3101/ASTM A36) for strength in harsh conditions.

   • Shafts crafted from 45# steel (equivalent to DIN C45/JIS S45C/ASTM A1045) for precision and durability.

   • Optional rubber or polyurethane spiral coatings for enhanced wear resistance and corrosion protection.

3. High-Quality Bearings

   • Equipped with deep groove ball bearings (6204, 6205, 6305, etc., with C3 clearance, 2RZ/2Z seals) for smooth rotation and long life.

   • Triple labyrinth seals protect against dust, dirt, and moisture, ideal for mining environments.

4. Low Noise and Vibration

   • Precision manufacturing and balance testing minimize noise and vibration during operation.

   • Reduces wear on the belt and conveyor frame, extending system lifespan.

5. Corrosion Resistance

   • Options for zinc plating, baking paint, or epoxy coatings to resist rust in environments like coastal ports.

   • Rubber or polyurethane spiral surfaces provide additional durability in abrasive or corrosive conditions.

6. Customizable Design

   • Roller diameters from 63.5mm to 219mm, lengths from 120mm to 2200mm, fitting belts 400mm to 2400mm wide.

   • Customizable spiral pitch, material, and frame designs to match specific conveyor setups and material types.

7. Standards Compliance

   • Meets DTII, DTII(A), CEMA (B, C, D, E), JIS, and ISO 9001:2015 standards for quality and safety.

   • Tested for radial runout (≤0.5mm), axial displacement (≤1.2mm), and rotation resistance (≤3.5N) to ensure reliability.

DTII Belt Conveyor Screw Idler Applications:

The DTII Screw Idler is used on the return side of conveyors to support the empty belt and clean sticky material, making it ideal for handling wet, sticky, or abrasive materials in various industries. It’s perfect for these applications:

1. Mining

   • Cleans sticky coal dust, iron ore, or bauxite from return belts in underground or open-pit mines.

   • Suits long-distance systems, like a 5 km conveyor in Shanxi, ensuring clean belts and stable operation.

2. Metallurgy

   • Removes sticky residues from return belts in smelting plants handling raw or processed metals.

   • Corrosion-resistant coatings withstand abrasive or high-temperature environments.

3. Ports and Terminals

   • Cleans sticky materials like coal or grain from return belts during loading/unloading.

   • Rust-resistant options are ideal for salty coastal conditions.

4. Construction

   • Removes sticky aggregates or mud from return belts on job sites.

   • Works with mobile or fixed conveyors for versatile setups.

5. Power Plants

   • Cleans coal dust or ash from return belts in fuel or waste systems.

   • Designed for dusty, high-tension environments.

DTII Belt Conveyor:

Purpose and Scope of Use:

DTII、DTII(A) fixed belt conveyors. Their main parameters, transmission power, and tension calculation methods adopt ISO international standards, and are widely used in various industries.The material is transported by a single or multiple unit synthetic transportation system.This conveyor is suitable for working in temperatures ranging from -25°C to 40°C.

Product Features:

◆ Conveying materials is below 2.5t/m3◆ Can be divided into 500, 650, 800, 1000, 1200, 1400, 1600, 1800, 2000、2200, 2400◆ Can be divided into：0.8, 1.0, 1.25, 1.6, 2.0, 2.5, 3.15、4.0, (4.5), 5.0, (5.6), 6.5 

Belt  width  (mm)	0.8	1.0	1.25	1.6	2.0	2.5	3.15	4	(4.5)	5.0	(5.6)	6.5
500	69	87	108	139	174	217
650	127	159	198	254	318	397
800	198	248	310	397	496	620	781
1000	324	405	507	648	811	1014	1278	1622
1200		593	742	951	1188	1486	1872	2377	2674	2971
1400		825	1032	1321	1652	2065	2602	3304	3718	4130
1600					2186	2733	3444	4373	4920	5465	6122
1800					2795	3494	4403	5591	6291	6989	7829	9083
2000					3470	4338	5466	6941	7808	8676	9717	11277
2200							6843	8690	9776	10863	12166	14120
2400							8289	10526	11842	13158	14737	17104

Note:1. The conveying capacity in the table is calculated based on horizontal transportation, with a dynamic stacking angle of 20° and a roller groove angle of 35°.2. The belt speeds of 4.5m/s and 5.6m/s in the table are non-standard values and are generally not recommended for use.

Installation Guidelines:

Installing DTII Screw Idlers is straightforward with these steps:

1. Verify Specifications

   • Ensure the idler’s diameter, length, spiral pitch, and frame design match your conveyor’s belt and return side requirements.

   • Confirm the frame can support the idler’s weight and belt tension.

2. Position the Idlers

   • Install on the return side, typically spaced 6-10 feet apart, depending on the belt width and material type.

   • Use sturdy frames to secure the screw idlers, ensuring proper alignment with the belt.

3. Align the Idlers

   • Set idlers perpendicular to the belt to ensure even support and effective cleaning.

   • Use a laser level or string line to align the frame with adjacent idlers for consistent tracking.

4. Inspect Bearings and Seals

   • Verify bearings are lubricated with lithium soap grease and triple labyrinth seals are intact.

   • Avoid disturbing seals to maintain dust and water resistance.

5. Adjust Belt Tension

   • Set tension to keep the return belt taut without overloading the idlers. Use:[ T = \frac{P_p \cdot 1000}{v} ] where (T) is tension (Newtons), (P_p) is power (kilowatts), and (v) is belt speed (meters/second).

6. Test the System

   • Run the conveyor at low speed with no load to check idler performance, spiral cleaning effectiveness, and belt alignment.

   • Adjust the frame or idler position if material buildup persists or the belt drifts.

Installation Tips

• Utilize trained technicians to ensure compliance with safety and industry standards.

• Document installation details for maintenance records.

• Contact [Your Company Name] for expert setup assistance.

Maintenance Tips

Regular care keeps DTII Screw Idlers performing well:

• Inspect Regularly: Check spiral surfaces, rollers, bearings, and frames every 3-6 months for wear or damage.

• Lubricate Bearings: Apply lithium soap grease every 6 months to ensure smooth rotation.

• Clean Spiral Surfaces: Remove any material buildup from the spiral to maintain cleaning effectiveness.

• Check Alignment: Verify idlers remain perpendicular to prevent belt drift.

• Use OEM Parts: Replace with DTII-compliant parts to maintain performance.

• Avoid Damage: Do not strike the idler or spiral surface with heavy objects to prevent damage to bearings or seals.

Customer Feedback:

Here’s what users of DTII Screw Idlers say:

1. Australian Iron Ore Mine

   “These spiral rollers clear sticky ore residue like nothing else. Our belts stay clean, and downtime is way down.” – Jack Thompson, Site Engineer

2. South African Port Terminal

   “The corrosion-resistant coatings are perfect for our coastal setup. These idlers need minimal upkeep.” – Zanele Mokoena, Logistics Manager

3. Chilean Copper Mine

   “Our conveyor’s efficiency is up 20% with these screw idlers. They’re tough and keep the belt clean.” – Maria Gonzalez, Maintenance Supervisor

Related Questions (FAQs):

Got questions? Here are clear answers with keywords to help you find us:

1. What’s a DTII Screw Idler?

A return-side idler with a spiral surface that cleans sticky material from the conveyor belt, preventing buildup and misalignment.

2. How does it clean the belt?

The helical or spiral surface scrapes off sticky material like coal dust or mud as the belt moves, keeping it clean.

3. What’s it made of?

Q235 steel for roller tubes, 45# steel for shafts, with optional rubber or polyurethane spiral coatings for durability.

4. How often should I maintain it?

Inspect every 3-6 months, lubricate bearings, clean spiral surfaces, and check alignment. Don’t tamper with seals.

5. Can it be customized?

Yes, we offer various sizes, spiral pitches, and coatings to fit your conveyor.

6. Where’s it used?

Mining, metallurgy, ports, construction, and power plants for handling sticky materials like coal or ore.

7. How does it improve my conveyor?

It prevents material buildup, reduces belt wear, and lowers maintenance for better efficiency and safety.