DM-1.1 Rail Grinding Machine

DM1.1 Rail End Grinding Machine for Sale

DM-1.1 Electric Rail End Grinding Machine

AGICO supplies various rail grinder models for different rail grinding works, among them DM-1.1 rail grinding machine is a support equipment for ensuring railway track welding quality and operational safety. In railway track maintenance, the rail’s end flatness directly affects welding quality. The DM-1.1 Electric Rail End Grinder is a high-efficiency, precision grinding tool specifically designed for pre-welding grinding of rail ends, it is usually used together with small mobile gas pressure welding equipment.
Performance: This rail grinder is designed for rail end grinding before rail welding. It can quickly removing oxidation layers, burrs, and uneven defects from rail end surfaces, improve the surface quality to meets the strict requirements of Rail Welding Technical Specifications.

Key Features:

DM-1.1 rail end grinding machine is one of our hot sale models, it is designed to have the following advanced designs and advantages,

Quick Mounting: It has a unique concave rail hook and set screw design for rapid positioning and secure mounting.
Easy Operation: Users can control the axial and radial feeds separately by handwheel and lever.
High Grinding Efficiency: The DM-1.1 rail grinding machine adopts a high-power motor installed with a high-speed bowl-shaped grinding wheel.
Reliable Precision: It has a solid structure design to ensure the grinding wheel surface is perpendicular to the rail axis.

Technical Specifications of DM-1.1 Rail Grinding Machine

DM-1.1 rail grinding machine is designed to have the following parameters, check this table below to learn more about this rail grinder. If you still have any other questions, feel free to contact now!

Parameter	Specification
Motor	Three-phase asynchronous motor
Rated Voltage	380V / 50Hz
Rated Power	1.1 kW
Rated Speed	2800 r/min
Grinding Wheel	Bowl-shaped grinding wheel (BW)
Dimensions (OD×Thickness×Bore)	150 mm × 50 mm × 32 mm
Maximum Peripheral Speed	≤ 35 m/s
Equipment Dimensions	Approx. 500 mm × 260 mm × 180 mm
Net Weight	Approx. 15 kg

How does DM-1.1 Rail Grinding Machine Work

The DM-1.1 rail grinding machine achieves precision grinding of rail end surfaces through the control of 3 aspects :

Primary Grinding: The motor directly drives the bowl-shaped grinding wheel to rotate at high speed, providing cutting power.
Axial Feed: Rotating the handwheel engages the internal lead screw-nut mechanism, moving the entire swing frame along with the motor to control grinding depth.
Radial Feed: Operating the lever causes the swing frame to pivot around the guide rod axis within a certain angle, enabling the grinding wheel to perform radial (perpendicular to the rail axis) reciprocating grinding on the rail end surface.

Note: A structural schematic diagram should be inserted here for reference.

Main Components of DM-1.1 Rail Grinding Machine

DM1.1 Rail End Grinding Machine Structure

DM-1.1 rail grinding machine has a simple structure which is easy for quick-mounting. The concave rail hook, set screw , and positioning screw together can securely fixing the rail grinder to the rail and ensuring accurate initial positioning.

Power & Grinding Unit: Motor, bowl-shaped grinding wheel.
Feed Mechanism: Handwheel (axial feed screw-nut), lever and swing frame (radial swing).
Mounting & Positioning Mechanism: Concave rail hook, set screw, guide rod, positioning screw.
Frame & Guards: Main frame, necessary protective covers.

Operating DM-1.1 Rail Grinding Machine

DM-1.1 Rail Grinding Machine Package

DM-1.1 Rail End Grinding Machine Delivery

Before the rail grinding work, a series of check works shall be completed. The grinding wheel shall be inspected for cracks and damage, check the power cord, plug and ground wire connection. Check the rotation direction before install the grinding wheel.

Operating Steps for Rail End Grinding

The operation of DM-1.1 rail grinding machine is simple, the operator shall be well trained before the operation, user shall learn from the operation video or be trained by an experienced operator.

Startup: Ensure the operation area is safe, then start the motor.
Axial Feed: Slowly rotate the handwheel to bring the grinding wheel into contact with the rail end, beginning axial feed grinding. Apply feed evenly and in small increments to avoid impact.
Radial Grinding: Simultaneously or alternately with axial feed, reciprocate the lever to swing the grinding wheel left and right across the end surface for radial grinding until the entire surface is covered.
Process Observation: Observe grinding sparks and surface condition. Grind evenly until the entire end surface exhibits uniform metallic luster and the required flatness is achieved.
Shutdown: After grinding, first retract the wheel from the workpiece, then turn off the motor power.

After Grinding, the operator shall remove the rail grinder from the rail track and turn off the main power, clean metal dust from the equipment using compressed air or a brush, especially from motor cooling fins and moving parts, put the rail grinder in a dry, clean toolbox.

Maintenance Before and During Operation

Maintenance of the DM 1.1 rail grinding machine differs before and during operation. Here are the details:

Before Operation

Grinding Wheel Condition: Check for cracks and uneven wear.
Electrical System: Inspect cable, switch insulation, and grounding reliability.
Mounting Mechanism: Check concave rail hook for deformation, set screw thread smoothness, and the positioning screw effectiveness.
Moving Parts: Check handwheel rotation and swing frame movement for smoothness and abnormal resistance.

DM 1.1 Rail Grinding Machine for Rail End Grinding

DM-1.1 Electric Rail Grinding Machine Operation

During Operation

Lubrication Management: Every 2 hours of continuous operation, apply a small amount of No. 2 lithium-based grease to friction surfaces such as the lead screw, guide rod sliding surfaces, and nut thrust grooves to maintain smooth movement.
Heat Control: Avoid prolonged continuous heavy-duty operation. Recommended: Stop for 5 minutes every 30 minutes to prevent excessive motor temperature rise (housing temperature should not exceed 80°C).
Dust Removal: Periodically use compressed air to blow away iron dust accumulated in motor cooling fins and mechanism gaps.

Storage Requirement for Long Period

When DM 1.1 rail grinding machine is not in use for a long time, it shall be storaged in a dry, ventilated warehouse with temperature -10°C to +40°C, relative humidity ≤75%. And it shall be cleaned thoroughly and apply anti-rust oil to exposed metal surfaces (e.g., guide rod, lead screw). Grinding Wheel shall be removed for separate storage, and each month run the rail grinding machien unloaded for 15 minutes to dispel moisture and maintain electrical component condition.

Troubleshooting Guide Table

Symptom	Possible Cause	Solution
Motor does not start	1. Power not connected or phase loss 2. Switch damaged 3. Motor damaged	1. Check power, plug, fuses 2. Check/replace switch 3. Repair/replace motor
Motor overheats	1. Continuous operation too long 2. Feed rate too high 3. Cooling fins clogged 4. Low voltage	1. Allow to cool; operate intermittently 2. Reduce grinding feed 3. Clean dust from cooling fins 4. Check power supply voltage
Low grinding efficiency	1. Dull or incorrect wheel type 2. Insufficient motor speed 3. Loose mounting causing vibration	1. Replace with sharp wheel 2. Check voltage and motor 3. Remount and secure equipment
Axial/radial movement stiff	1. Poor lubrication 2. Bent lead screw or guide rod 3. Contamination with metal chips	1. Clean and lubricate 2. Check, straighten, or replace 3. Clean moving parts
Excessive vibration	1. Unevenly mounted or cracked wheel 2. Damaged spindle bearings 3. Unstable mounting	1. Remount or replace wheel 2. Replace bearings 3. Remount and secure

Read and understand this entire manual before operating or maintaining.

This manual is based on the standard version. Product improvements may not be notified separately; refer to the actual equipment. Operations and maintenance must comply with your organization's safety regulations.

Personal Protection: Always wear safety glasses, dust mask, hearing protection, and durable gloves. Do not wear loose clothing.
Electrical Safety: Ensure power supply is 380V/50Hz three-phase with correct wiring. The equipment housing must be grounded. Check cable insulation before use to prevent electric shock.
Grinding Wheel Safety: Inspect the grinding wheel for cracks or damage before installation. Never use a defective wheel. Ensure the wheel clamping nut is securely tightened.
Secure Mounting: Confirm the grinder is firmly secured to the rail using the rail hook and set screws before operation to prevent loosening or detachment during startup or operation.
Operation Monitoring: Keep body parts away from rotating components during operation. Listen for abnormal vibrations or noises and stop immediately if detected.
Environmental Safety: Ensure adequate ventilation in the work area. Keep away from flammable materials. Outdoor operation is prohibited in wet or rainy conditions.

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