I. Application
The HGY5314TFC synchronous chip sealer is used for chip sealing the surfaces of roads and coating and waterproofing bridges. Asphalt binder spraying and aggregate spreading are performed synchronously so they achieve maximum cohesion.

Our asphalt sealer is researched and developed independently, earning proprietary intellectual property rights for its advanced technology. Improving on the design of the KT0608 synchronous chip sealer, we have enlarged the asphalt tank to 8 m³and the hopper to 14 m³. This synchronous chip sealer can spread chips without lifting the hopper, which allows it to be used in narrow spaces such as under bridges or around curves. A strong agitator in the asphalt tank prevents the asphalt rubber from separating into liquids and solids. The pavement chip sealer incorporates mechanical, electric and hydraulic systems in one machine, simplifying the operating process.

III. Components and Structures of the Synchronous Chip Sealer
The synchronous chip sealer consists of 8 systems: a tractor, asphalt spray system, aggregate spreading system, air circuit system, water circuit system, control system, speed measuring system and power supply system.

Tractor
The synchronous chip sealer is equipped with a Sinotruk Howo tractor, model ZZ3317N4667D1 (a National Emissions Standard Stage Four vehicle) which features strong power (max power is 276kw), a heavy load capacity, low fuel consumption, easy operation and a reliable braking system.

Asphalt Spray System
The asphalt spray system for the synchronous chip sealer includes a heating subsystem and asphalt spray subsystem.

Heat Oil Heating Subsystem

4. Burner: Directly heats the interlayer between the fire tube and asphalt tank. Nozzles and asphalt pipelines are heated and insulated by a heat oil circuit that keeps asphalt moving smoothly from the pipes to the tank. The synchronous chip sealer employs an imported burner which has a short preheating time and high heating efficiency, maintaining a proper temperature for spraying.

5. Mixing: A vertical mixing device in the tank shortens the time it takes to heat up the asphalt and prevents the asphalt mixture from separating.

Asphalt Spray Subsystem
The asphalt spray subsystem consists of an asphalt tank, asphalt pipeline, asphalt pump, asphalt valve bank, asphalt filter, spray unit, and lifting and swinging device for the spray bar.

2.Asphalt Pipeline: Delivers asphalt to the spray bar and begins major and minor cycles: asphalt tank – pipeline – asphalt pump – pipeline – asphalt tank. A heating oil pipe alongside the asphalt pipes reduces thermal loss in transport.

4.Asphalt Valve Bank: Controls circulation of the asphalt via a valve block and cylinder. Patent No. 200520078497.

5.Asphalt Filter: Filters out foreign matter in the asphalt to protect the asphalt pump and prevent blocked nozzles.

7.Lifting and Swinging Unit of Spray Bar: Two hydraulic lifting cylinders and one swinging cylinder are utilized by the synchronous chip sealer to regulate the direction and height of the spray bar, thus achieving a better performance.

Air Circuit System
The air circuit system consists of an air source from the chassis, distribution gas bag, control valve, air conduct, joint, solenoid valve and cylinder. An air source from the chassis allows the aggregate spreading system, asphalt spray system, asphalt valve bank and water circuit system to work well.

Water Circuit System
This system includes a water tank, filter, solenoid valve, water pipeline, water sprinkler rack and nozzle. Nozzles on each tire spray water to prevent wet asphalt from sticking to the tires during operation and keeps the synchronous chip sealer from skidding or overheating in tough working conditions. A nozzle installed on the belt conveyor’s roller sprays small amounts of water on the roller to keep the belt from slipping.

Control System
1. The special controller, ensuring the stability of the electrical system, features high protection grade and is dustproof, waterproof, and resistant to impact.
2. PLC accurately calculates spraying data according to various work requirements and sets parameters for real-time conditions.
3. The PLC automatically modifies and calibrates parameters according to asphalt density and truck load to accurately regulate the asphalt pump displacement and limit the error rate of the spray amount to within 1.5%.
4. Encoder monitors vehicle speed and asphalt pump speed for precise spraying.
5. Easy to switch between manual and automatic modes.
6. Modify amount of asphalt spraying and aggregate spreading depending on pavement width. Aggregate level limits transducer makes sure the synchronous chip sealer always release the right amount of aggregate.
7. Automatic alert when aggregate reaches minimum and maximum limits and adjusts asphalt amount.
8. High-definition camera at the rear of the vehicle lets users operate while driving in the cab.

Speed Measuring System
The speed measuring system includes electric power, velocity radar, radar mounting, signal conversion devices and signal output devices. The electricity system uses a 12V DC inverse power supply, avoiding potential safety hazards caused by heavy outdoor currents. The radar, made in America, features high accuracy, wide range of speed measuring, flexible operation and adaptability. The whole waterproof system is capable of resisting interferences and shock, making the synchronous chip sealer possible to work full-time in any weather.

Chip Spreading System
The chip spreading system consists of a spreader frame, feed gate, roller, distributor plate, and spreader plate. The 35° angle of the inclined plane allows aggregate to free fall from the fixed hopper to the feed gate to the roller, which pushes the chips evenly to the distributing plate. When the aggregate reaches a maximum level, the lifting hydraulic cylinder transfers the aggregate from the portable hopper to fixed hopper for spreading.
1. Spreader frame: Connects the hopper to the spreader, feeding the aggregate through a designated feed gate.
2. Feed gate: Controls the size of the feed gate and the spread volume.
3. Roller: Adjusts the spread volume.
4. Distributor plate: Evenly distributes the aggregate from the roller to spreader plate.
5. Spreader plate: Spreads aggregate on the ground.

Power Supply System
The auxiliary engine has the advantages of strong power and reliable performance, supplying power to the hydraulic and electrical systems to keep the synchronous chip sealer performing stably.

IV. Advantages
1. Automatic controls means there is no need to lift the hopper to spread aggregate, allowing the synchronous chip sealer to be used in narrow spaces such as under bridges and at curves.
2. The road maintenance equipment reduces the intensity of labor, initial cost investment, and human resources while improving work efficiency and quality.
3. The anti-corrosive and durable insulation layer keeps the insulation index at no more than 20℃ for 8 hours.
4. High precision nozzles maintain uniform and reliable spraying of aggregate sized 3mm to 25mm.
5. Remote control features make the synchronous chip sealer easy and convenient to operate, and a HD camera in the back allows users to operate from the cab.
6. The amount of asphalt spray and spreading width can be precisely calculated.
7. Improvements based on customer feedback keep this chip sealing equipment reliably performing, easy to operate, and cost-effective.