Non Metalic Chain Scrapers
Chain scraper system for collecting bottom sediment and floating substances for a rectangular primary sedimentation tank and secondary sedimentation tank
Scraper description
Chain scraper system is suitable for skimming, dross and scraping sand in rectangular tanks such as sedimentation tanks, grit tanks, grease traps and other rectangular tanks in refineries, water plants or sewage treatment plants. This equipment should be used with auxiliary settings such as oil collection pipes and sludge discharge valves to separate the oil slick residue on the water surface and the sediment at the bottom of the pool to complete the initial purification treatment.
The non-metallic chain scraper is equipped with two parallel closed traction chains. It is equipped with a number of scrapers, and under the traction of the driving device, the chain and scraper run along the guide wheels and guide rails set up and down the sedimentation tank to form a quadrilateral track. Using the scraper to circulate slowly up and down, the oil residue floating on the liquid surface can be scraped from the inlet end to the inlet end of the oil collection pipe and discharged, and the sediment settled at the bottom of the pool can be scraped from the inlet end to the sludge collection tank at the outlet end and discharged through the sludge discharge valve, so as to complete the purpose of the first mechanical purification of sewage.
Features of chain scraper:
1) The number of scraping plates is large, and the ability to scrape mud is strong; The scraper moves slowly, has little disturbance to sewage, and is conducive to sedimentation.
2) The scraper makes continuous linear motion in him, does not have to commutate back and forth, and therefore does not need a stroke switch. The drive unit is located on a platform at the top of the pool, which is easy to distribute and maintain.
3) No additional mechanism is required, and it can double as a skimmer at the same time.
4) There are no heavy structural components and supports in the system, and the energy consumption of the system is low.
Overall composition
Figure 4-2-1 is the overall structure of the chain scraper, which is mainly composed of drive device, transmission chain and sprocket, traction chain and sprocket, scraper, guide wheel, tensioning device, sprocket shaft and guide rail. A safety pin is installed on the active sprocket of the drive sprocket for overload protection
V. Working principle
1. The chain scraper is to continuously remove the solid suspended solids floating on the water surface and the sludge at the bottom of the pool, move along the pool surface and the bottom of the pool, and push the suspended solids from the inlet end of the liquid level to the outlet end. It can be applied to rectangular primary and secondary sedimentation tank inner surface skimming and bottom scraping operations, as well as surface skimming of various tank shapes, and has been widely used in the water treatment industry in recent years.
2. Under the drive of the peripheral drive device, the main beam travels along the top of the pool at a linear speed of 2.0m/min with the central rotating support as the axis, and the lower part of the main beam is connected to the bracket, sludge scraper, etc. When the main beam rotates, the scum scraper skimming the liquid level from the center of the pool to the pool circumference, collected in the chain scraper area, the collected dross moves with the host around the pool to the skimming hopper, scrapes into the skimming hopper through the chain activity of the scraper plate, and is discharged to the outside of the pool.
3. When the scraper reciprocates, there is a layer of sludge at the bottom of the pool that is always moving forward until it falls into the mud collection trench. The reciprocating movement of the scraper also has the effect of thickening the sludge, which is important in practical applications. When the amount of sewage is equal, the higher the concentration of sludge, the lower its water consumption rate, which also reduces the loss of water and energy.
1. Main structure
(1) Drive mechanism
The drive mechanism adopts the helical gear reducer directly connected to the motor, which is provided by Shandong Tianlang Environmental Protection Technology Co.,Ltd. with high transmission efficiency and stable operation. The safety service factor of the reducer ≥ 12
(2) Drive chain
The drive chain is made of glass fiber reinforced nylon rollers, stainless steel chain plates, and pins. The pitch is 25.4mm, and the transmission movement is stable, accurate, and efficient. Considering the harsh working environment, the safety factor is 8.
(3) Scraper device
The underwater sprocket is made of glass fiber reinforced nylon precision casting, and the transmission movement is accurate and reliable. The chain pitch is 152.4mm, which is specially designed and manufactured. The drive chain adopts the plate chain structure form. The chain plate and roller are made of glass fiber reinforced nylon by one-time precision casting.
The scraper is made of high glass fiber + toluene dimethyl polyester (glass fiber reinforced plastic), which has strong rigidity and corrosion resistance. The installation distance of the scraper is 2.74 meters. The scraper is installed with a wear-resistant fiberglass-reinforced nylon, which is in contact with the upper and lower guide rails, and can be exchanged on both sides. long lasting. time wear. The guide rail is made of reinforced polyethylene, the seeding guide rail is fastened to the pool bolt by the guide rail bracket, and the bottom rail is fastened with stainless steel bolts.
(4) Scum collector
The tilting tube type scum collector has simple structure, no power device and reliable operation. The seal is made of binary B inner rubber, and the scum collector tube is made of stainless steel. The diameter of the pipe is 400mm, and the thickness of the pipe wall is 6mm. The scum collector discharges the collected scum into the scum well.
Manually operate the scum collector installation vehicle at the center of the slag-spreading side of each sedimentation tank, using handwheel operation, and the manual operating force is less than 150N.
(5) Electrical control
The electric control cabinet has the protection function of motor phase loss, undervoltage, leakage, etc. At the same time, it has the function of dynamic and automatic control. The PLC interface is reserved for joint control with other equipment, and the acceptance signal is sent to the central control room. The electric control cabinet is outdoor type, and the protection level is IP55.
2. Working principle
The scraper on the rotating chain is used to scrape the mud and sand deposited at the bottom of the pool into the sludge collection bucket, and the scum on the pool surface is collected into the scum collector, which can be operated continuously or intermittently.
3. Scope of supply
Supply of the whole machine, including auxiliary mud plate, drive device (motor, reducer, drive chain)
Guide rails and brackets, scraper chains, drive sprockets, all mounting accessories and fasteners
Electric control box and spare parts
SELECTION & TECHNICAL QUESTIONS
Q1: How do I select the right conveyor model? What information should I provide?
> To recommend the most suitable solution, please provide the following details:
> 1. Material type: What material are you conveying? (e.g., fly ash, wood chips, biomass pellets, bottom ash, etc.)
> 2. Material properties: Particle size, temperature, moisture content, abrasiveness
> 3. Capacity requirement: How many tons per hour (t/h) do you need?
> 4. Installation conditions: Conveying distance, incline angle, space limitations
> 5. Application industry: Which industry is this for? (e.g., waste-to-energy plant, biomass power plant, cement plant)
> You can also email us or contact us via WhatsApp. Our engineers will get back to you within 24 hours.
Q2: What is the difference between screw conveyors and chain conveyors? Which one should I choose?
> Both types have different applications:
> – Screw Conveyors: Best for powdery and small-grain materials (e.g., fly ash, cement powder). Good sealing performance, simple structure, low maintenance cost.
> – Chain Scraper Conveyors: Best for bulky, highly abrasive materials (e.g., bottom ash, municipal solid waste, biomass fragments). Supports multiple inlet and outlet points.
> – Bucket Elevators: Ideal for vertical or steep-incline material lifting.
> If you are not sure, tell us your material and working conditions, and our engineers will help you choose.
Q3: Can your equipment handle high-temperature materials? What is the maximum temperature?
> We can customize equipment according to material temperature:
> – Standard type: 0~80°C, carbon steel
> – Medium temperature type: 80~200°C, thickened wear-resistant liner
> – High temperature type: 200~400°C, special heat-resistant steel, optional cooling jacket
> Please tell us your material temperature, and we will recommend the most suitable material solution.
Q4: Are there any limits on conveying distance and lifting height?
> Standard design range:
> – Screw conveyor: Single section up to 70 meters; multiple sections can be connected for longer distances
> – Chain conveyor: Single machine up to 60 meters
> – Bucket elevator: Lifting height up to 50 meters
> We can also customize for extra-long distances or special angles. Contact us for detailed solutions.
Q5: Do you provide explosion-proof design?
> Yes. For explosive and flammable conditions such as pulverized coal and biomass dust, we offer:
> – Explosion-proof motors (Ex d IIB T4 standard)
> – Reserved openings for explosion vents / rupture discs
> – Fully sealed structure to prevent dust leakage
> Please specify your explosion-proof rating requirements.
CUSTOMIZATION & MANUFACTURING
Q6: Do you support customization? What is the lead time?
> Over 90% of our equipment is customized according to customer working conditions. Standard models take about 90–120days. Special customizations take 120–180 days, depending on configuration complexity.
Q7: What material options do you offer?
> Common materials include:
> – Carbon steel (Q235B): Standard working conditions
> – Wear-resistant steel (NM400/NM500): Highly abrasive materials
> – Stainless steel 304/316L: Food, chemical, corrosion-resistant requirements
> – Bi-metal wear-resistant composite plate: Extreme abrasion conditions
> We will recommend the most cost-effective material solution based on your material properties.
Q8: What certifications do you have?
> We hold the following certifications:
> – ISO 9001:2015 Quality Management System
> – ISO 14001 Environmental Management System
> – ISO 45001 Occupational Health & Safety Management
> – CE Certification (EN 1090 Steel Structure)
> If you need scanned copies of specific certificates, please contact us.
DELIVERY & LOGISTICS
Q9: Which countries do you export to? Do you have export experience?
> Our equipment has been exported to more than 20 countries worldwide, including:
> – Europe: Germany, France, Poland, Turkey, etc.
> – Southeast Asia: Singapore, Thailand, Indonesia, Vietnam, etc.
> – Middle East: Saudi Arabia, UAE, etc.
> – South America**: Brazil, Chile, etc.
> We are familiar with the full export process: packaging, customs declaration, and ocean freight. We can provide FOB, CIF, and other trade terms.
Q10: What is your packaging method? Is it suitable for long-distance ocean shipping?
> Export-standard packaging:
> – Large items / complete machines**: Rust prevention + waterproof film + fumigated solid wood pallet
> – Precision components: Wooden case with shock-absorbing filling
> – Random accessories: Categorized packing with detailed packing list
> All wooden packaging meets IPPC fumigation standards for direct customs clearance.
Q11: What is your minimum order quantity?
> We do not have a strict minimum order quantity. Single-unit orders are welcome. Bulk orders can enjoy more favorable pricing.
INSTALLATION & AFTER-SALES
Q12: Do you provide installation guidance? Do engineers need to come to site?
> We offer two service options:
> 1. Remote guidance: Detailed installation drawings and operation manuals, video guidance for installation (free of charge)
> 2. On-site service: Dispatch engineers to site for installation and commissioning (travel costs are additional)
> Most customers choose remote guidance. Our equipment is designed as a modular structure for easy installation.
Q13: What is the warranty period? What are the wearing parts?
> Standard warranty period is 12 months (from the date of arrival at port).
> Wearing parts list:
> – Chain / screw flights: Approximately 1–3 years, depending on material abrasiveness
> – Liners: Approximately 2–4 years
> – Bearings: Approximately 2–3 years
> We recommend ordering a wearing-parts spare kit together with your first order.
Q14: How do you solve problems during operation?
> We provide 7×24 technical support:>
> – Response within 24 hours for technical issues
> – Remote video troubleshooting guidance
> – Engineer on-site service when necessary
> – Common spare parts in stock for fast delivery
QUOTATION & COOPERATION
**Q15: How can I get a quote? How long does it take?
> Quotation process:
> 1. You provide material parameters, capacity, installation conditions, and other requirements
> 2. Our engineers evaluate and select the appropriate model
> 3. Formal quotation and technical proposal provided within 7 working days
> You can contact us via email, or the online inquiry form.
Q16: What are your payment terms?
> Standard payment terms:
> – 30% advance payment: After contract signing, to start production
> – 70% balance: Before shipment, or against copy of Bill of Lading
For long-term cooperative customers, more flexible payment terms can be negotiated.
Follow these 3 steps to find your ideal conveyor solution
Step 1: Identify Your Material Type
Different materials require different conveyor designs. Tell us what you are conveying:
| Material Category | Examples | Recommended Conveyor Type |
| Powder / Fine Granules | Fly ash, cement powder, lime powder | Screw Conveyor |
| Small Granules / Pellets | Biomass pellets, plastic granules, grain | Screw Conveyor / Belt Conveyor |
| Fragments / Chips | Wood chips, bark, agricultural residues | Chain Scraper Conveyor |
| Bulky / Abrasive | Bottom ash, slag, MSW, clinker | Chain En-Masse Conveyor |
| Vertical Lift | Any bulk material needs vertical transport | Bucket Elevator |
Step 2: Define Your Working Conditions
Please prepare the following parameters before contacting us:
| Parameter | Why It Matters | Example |
| Capacity (t/h) | Determines conveyor size and power | 10 t/h, 50 t/h, 100 t/h |
| Conveying Distance (m) | Determines machine length | 15m horizontal, 30m incline |
| Incline Angle (°) | Affects capacity and design | 0° horizontal, 30° incline |
| Material Temperature (°C) | Determines material grade | Ambient, 150°C, 300°C |
| Moisture Content (%) | Affects discharge design | Dry, damp, wet (needs dewatering) |
| Abrasiveness | Determines liner thickness | Low, medium, high |
| Application Industry | Determines certification needs | Power plant, cement, mining, recycling |
Step 3: Choose Configuration Options
Based on your answers above, our engineers will recommend:
Material grade — carbon steel / wear-resistant steel / stainless steel
Sealing type — open trough / fully enclosed / gas-tight
Drive system — motor power, gearbox brand, speed range
Auxiliary options — explosion-proof motor, cooling jacket, cleaning device, level sensors
Not Sure Where to Start?
Send us your basic requirements, and our engineers will design a customized solution for you — completely free.
Email: bootec@bootecgroup.com Response time: Within 24 hours
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