This document describes the 250D Concrete Grinding Machine, an electric model designed for various floor grinding applications. It serves as an operator's manual, providing essential information on safety, operation, maintenance, and technical specifications.
Function Description
The WKG250D is specifically designed for concrete floor grinding, flattening concrete floors, and removing surface residues such as glue, adhesive, and putty. It operates by rotating grinding discs equipped with diamond tools to abrade the floor surface. The machine is an electric model, requiring a power supply for operation.
Important Technical Specifications
The manual provides the following operating dimensions for the WKG250D Electric Model:
- Model: WKG250D
- Length: 740mm
- Width: 420mm
- Height: 850mm
- Weight: 68kg
It is noted that all dimensions and weight are for reference only and are subject to change.
The machine utilizes different types of grinding tools depending on the application:
- For general grinding: 1pc 10-inch grinding cup wheel.
- For specific applications (e.g., removing thick glue or soft floors): 3pcs 4-inch trapezoid diamond segments. The manual advises increasing the number of diamonds under the machine to reduce the load on the grinder and operator when dealing with challenging surfaces.
Usage Features
The 250D Concrete Grinding Machine incorporates several features to enhance its usability and performance:
- Adjustable Design: The machine features an adjustable component, likely for controlling grinding depth or handle position, though specific details are not provided.
- Level and Water Cooling: The manual mentions "Level and water cooling," suggesting the machine may have a system for maintaining a level grinding surface and potentially a water-cooling mechanism for the diamond tools or motor, which can be crucial for wet grinding applications and extending tool life.
- Removable Shroud for Edge Grinding: A removable shroud is included, specifically for edge grinding, allowing the machine to work closer to walls and obstacles. This enhances the machine's versatility for comprehensive floor preparation.
- Transportability: The machine is designed to be folded to minimize space required for transport. Operators are instructed to carefully fold the machine forward and place padding between the motor and the electric box to prevent damage during transit.
- Vacuum Cleaner Connection: The machine must be connected to a vacuum cleaner during grinding to suck off dust. This is particularly important for dry grinding applications to maintain a clean working environment and ensure safety. Operators are reminded to ensure vacuum cleaner filters are intact and clean.
Maintenance Features
The manual outlines several maintenance and troubleshooting aspects to ensure the machine's longevity and safe operation:
- Regular Checks: Operators should regularly check all parts, ensure fixtures are tightened, and verify the functionality of safety equipment.
- Rubber Dust Skirt: It is essential to ensure the rubber dust skirt is intact, clean, and seals tightly against the floor, especially for dry grinding. Damaged skirts should be replaced.
- Diamond Tool Management: Diamond tools should always be removed after each grinding/polishing operation. Operators are warned that diamond tools can be very hot after use and protective gloves should be worn during removal.
- Cool-down Period: The grinding disc continues to rotate after the motor stops. Operators must maintain grinding action until the fan comes to a complete stop and ensure the grinding head has stopped rotating before raising the machine.
- Preventing Sticking: When removing glue, asphalt, or paint, the machine should be raised from the surface after use to prevent it from sticking to the floor due to heat.
- Rubber Shock Absorber Pads: These pads in the grinding unit should be checked monthly and replaced if worn out or damaged, as they can cause the machine to "jump around."
- Cleaning: The machine should be cleaned at the end of each working day. The plug must be pulled from the outlet before cleaning. High-pressure washers should not be used. Cooling air openings must be kept clear and clean to ensure sufficient cooling.
- Electrical Feed: Operators must check that the power cord and extension cord are intact and in good condition. Damaged cables can cause serious injury and must be repaired by an authorized service workshop.
- Professional Repairs: All types of repairs should only be carried out by authorized repairmen to prevent risks to operators.
- Overload Protection: If the machine stops after a short period, it may be overloaded, and the overload protection has been released. Reducing the load will allow the machine to reboot after the motor cools off. If the machine stops during start-up, it could indicate an overloaded electric motor or a missing phase, requiring a reset or contact with an authorized service workshop.
Safety Instructions
The manual places a strong emphasis on safety, requiring operators to:
- Read and understand the manual before use.
- Only operate the machine if they have received necessary education and training.
- Always use common sense and avoid situations beyond their capability.
- Consult an expert or dealer if uncertain about operating procedures.
- Personal Protective Equipment (PPE): Always use approved PPE, including a protective helmet, hearing protection, protective goggles or a visor, a breathing mask, tight-fitting heavy-duty clothing, and boots with steel toe-caps and non-slip soles.
- First Aid Kit: Always have a first aid kit nearby.
- No Modifications: Never modify the original design of the machine without manufacturer approval. Only use original spare parts. Unauthorized modifications can lead to serious injury or death.
- Dust and Vapors: Be aware that grinding can generate dust and vapors containing harmful chemicals. Operators must know the nature of the material being worked on and wear appropriate dust masks or respirators.
- Power Supply: Ensure the power supply and cables are not damaged. Check that the emergency stop button is not pressed.
- Starting the Machine: Only start the machine when grinding heads are resting on the ground, except during testing procedures. Never start without the rubber dust skirt attached.
- Power Disconnection: When changing grinding discs, ensure the power supply is OFF by engaging the Stop Button and disconnecting the power plug.
This comprehensive overview highlights the key aspects of the 250D Concrete Grinding Machine, emphasizing its functionality, technical details, operational features, and critical safety and maintenance guidelines.
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