NEXEN, a first level agent of Lisheng in the United States, has an agent certificate for the 924001 brake

NEXEN, a first level agent of Lisheng in the United States, has an agent certificate for the 924001 brake

The main power and gas source (pneumatic brake) of the equipment must be cut off first, and a "Do not close during maintenance" sign must be hung; For heavy-duty equipment such as cranes and elevators, additional mechanical support/counterweight protection should be installed to prevent the equipment from accidentally slipping during the disassembly of the brake.

Preparation of materials and tools

Data: original manual of the brake (including assembly drawings and parameter tables), equipment operation records (time, frequency, and operating conditions of faults);

Tools: Insulated multimeter, torque wrench, feeler gauge, tension gauge (for measuring braking force), specialized disassembly tool (to avoid damaging brake discs/brake shoes);

Consumables: matching brake shoes, sealing rings, lubricating grease (selected according to high temperature/food grade requirements), electromagnetic coil insulation paint, etc.

New cooperation model of the company:

1. Provide a European email address for overseas inquiries;

2. The number of email addresses is limited, first come, first served.

Advantage:

The success rate is higher, making it more convenient and free to place orders at a discount.

Verification process after repair

Static testing: Conduct a power on test to ensure that there is no jamming or abnormal noise during the closing/releasing action of the brake. The closing response time should be ≤ the value specified in the manual (usually ＜ 0.5s); After power failure, reset the brake to its original position and manually try to rotate the equipment shaft end without displacement.

Dynamic testing: Run the equipment without load and verify the braking stability through multiple start stop cycles; Test the braking force under heavy load conditions (using a tension gauge/torque meter to detect, and it needs to reach more than 90% of the rated braking force).

Parameter recording: Record data such as brake clearance, coil resistance, braking force, etc. after maintenance, and keep maintenance files for subsequent fault tracing.

4、 Key precautions for maintenance

Prohibition of unauthorized modifications: Do not replace non original brake shoes or springs at will (materials/specifications that do not match will result in insufficient braking force or excessive braking);

Insulation protection: After repairing the electromagnetic brake coil, an insulation withstand voltage test (usually with a 500V megohmmeter to measure insulation resistance ≥ 5M Ω) is required to prevent leakage;

Regular pre maintenance: After maintenance, it is necessary to set the next maintenance cycle (usually running for 5000 hours or 6 months, with high-frequency conditions shortened to 3 months), focusing on checking brake shoe wear, fastener torque, and coil temperature rise.

Scrap judgment after repair

If the following situations occur, the repair is of no value and the brake assembly needs to be replaced directly:

Brake disc/wheel hub cracks extend to critical stress areas;

Deformation of electromagnetic coil skeleton and carbonization of insulation layer;

Irreversible deformation of brake arm/housing;

After multiple repairs, the braking force still cannot reach 80% of the rated value.

NEXEN, a first level agent of Lisheng in the United States, has an agent certificate for the 924001 brake

Fault Typetypical phenomenonCore maintenance actions

Brake shoe wear/agingBrake weakness, excessive brake clearance, abnormal noise1. Replace brake shoes with the same specifications (prioritize original parts to avoid material mismatch that may cause a decrease in braking coefficient);

2. Use a feeler gauge to calibrate the brake clearance (usually 0.1-0.5mm, according to manual requirements);

3. Clean the dust/oil stains between the brake shoes and brake discs.

Electromagnetic coil malfunctionThe brake cannot be closed, trips after being closed, and the coil heats up1. Measure the coil resistance with a multimeter (compare with the standard value in the manual, if the deviation is greater than 10%, it needs to be replaced);

2. Check the insulation layer of the coil (if it is damaged, it needs to be repainted or replaced);

3. Check the power supply voltage (if the fluctuation exceeds ± 5%, a voltage regulator device needs to be installed).

mechanical stickingThe brake opening and closing are not smooth, and the reset is slow1. Disassemble the brake arm/shaft, clean rust and dust accumulation;

2. Apply high-temperature resistant grease to the pin shaft/sliding surface (ordinary butter is prohibited to avoid high-temperature carbonization);

3. Check if the spring is deformed/broken, and replace the failed reset spring.

Malfunction of pneumatic/hydraulic system (non electromagnetic brake)Delay in brake response and inability to brake1. Check for pipeline leaks and whether the pressure of the pressure reducing valve meets the standard;

2. Clean the solenoid valve core and replace the aging sealing ring;

3. Check the cleanliness of hydraulic oil/compressed air and replace the filter element as needed.

Brake disc/wheel hub damageScratches, deformations, and cracks on the disc surface1. Minor scratches can be polished, and if the depth is greater than 0.5mm or cracks occur, the brake disc needs to be replaced;

2. Correct the coaxiality of the brake disc (deviation>0.2mm can cause brake shake).

The core components of industrial brake vary depending on their driving methods (electromagnetic, permanent magnet, or pneumatic), but their core functional structures are similar. The following are the main core components based on publicly available materials:

Electromagnetic brake (type)

Electromagnetic brake controls braking through electromagnetic force, and its core components include:

Electromagnetic: Composed of a coil, iron core, and armature, it generates a magnetic field when powered and attracts the armature to overcome the spring force.

Brake arm (or lever): connects the electromagnetic armature and brake shoe to transmit electromagnetic force to achieve brake release.

Friction pad (or brake shoe): directly in contact with the brake wheel, braking is achieved through friction, usually made of high temperature resistant and high friction coefficient materials (such as metal ceramic composite materials).

Spring: Provides resetting force, pushing the brake arm to press the friction plate against the brake wheel when power is off, ensuring the safety feature of "power-off braking".

Brake wheel (or brake wheel): rigidly connected to the motor or load shaft, it is a rotating component acted upon by friction plates.

Industrial clutch is the core component of industrial transmission system, which achieves fast and controllable engagement/disengagement between power shaft and load shaft through friction, electromagnetic, pneumatic/hydraulic or mechanical self-locking, adapting to automation and heavy-duty scenarios.

1、 Working principle (mainstream type)

1. Friction clutch

Joining: The pressure device (spring/hydraulic/pneumatic) compresses the active friction disc and the driven friction disc, transmitting torque through frictional force.

Separation: Pressure release, friction disc detachment, power interruption.

Dry type: air cooling, suitable for medium and low loads, frequent start stop.

Wet: Oil lubricated cooling, suitable for high load, high frequency, and high temperature environments.

2. Electromagnetic clutch (automation)

Electric connection: The coil is energized to generate a magnetic field, which attracts the armature and compresses the friction disc to transmit torque.

Power off separation: The magnetic field disappears, the reset spring pushes open the friction disc, and the power is cut off.

Multi disc type: Multiple sets of friction discs stacked together, resulting in greater torque for the same volume.

3. Pneumatic/Hydraulic Clutch (Heavy Duty, High Torque)

Pneumatic: Compressed air pushes the piston to compress the friction disc; After exhaust, the spring returns and separates.

Hydraulic: High pressure oil drives the piston, with high pressure, high torque, and stable response.

4. Overpass clutch (one-way/reverse)

Wedge/roller structure: When driven faster than driven, the wedge tightens and transmits torque; Automatic release (overtaking) when driven faster than active, anti reverse, one-way transmission

As a first tier agent of NEXEN in China, Shanghai Hengzhe can sell multiple products under the brand, some of which are in stock.