BEd Series Explosion-Proof Electro-Hydraulic Thruster
Product Introduction
Purpose
The BEd series explosion-proof electro-hydraulic thruster (hereinafter referred to as "the thruster") is primarily designed for actuating electro-hydraulic drum brakes, cylinders, ratchets, valves, and other similar components. It can also drive lever mechanisms of various configurations to perform a range of motions, including reciprocating, oscillating, and rotary movements.This product is suitable for explosive environments containing methane and coal dust in underground coal mines.
Explosion-Proof Type & Product Category
Explosion-Proof Type:
Type: Mining Explosion-Proof Type
Explosion-Proof Mark: ExdbIMb
Product Category:
Classified by Thrust: 30 (300 N); 50 (500 N); 80 (800 N); 121 (1250 N); 201 (2000 N); 301 (3000 N)
Features
This thruster serves as an ideal component for realizing semi-automation and full automation of relevant mechanical equipment. Its piston rod is equipped with advanced protective treatment and double-layer protective seals, which effectively reduces wear and corrosion. The oil chamber of the hydraulic system adopts double-layer sealing rings, significantly extending the service life of the thruster.This thruster boasts such advantages as smooth and silent operation, low power consumption, long service life, and convenient maintenance.
Working conditions
-Installation altitude shall not exceed 1,000 m.
-Ambient temperature range: 0 °C to 40 °C.
-Power supply: Three-phase alternating current (AC) with a rated frequency of 50 Hz; rated voltage options are 380 V/660 V and 660 V/1140 V. Allowable voltage fluctuation range: -15% to +10%.
-Thruster duty cycle: S1 continuous duty cycle or S3 intermittent periodic duty cycle. For S3 duty cycle, the load duration rate shall not exceed 60%.
-Suitable for applications in coal mine belt conveyors, mine hoisting equipment, and other similar workplaces.
-Motor duty cycle: S1 continuous duty cycle and S3 intermittent periodic duty cycle (S3-60%).
Structure and working principle
The BEd series thrusters are mainly composed of explosion-proof motors, impellers, intermediate flanges, complete piston assemblies, and oil cylinders.When the thruster is powered on, the motor rotates to drive the impeller, which generates pressure oil. The pressure oil then drives the piston and connecting rod to move upward, and maintains the thrust load once the rated stroke is reached. When the thruster is powered off, the motor and impeller stop rotating and cease pressure oil production; the piston and connecting rod then return to their initial position under external force.
Technical Parameters (See Tables 1 and 2)
Table 1
|
Model |
Rated thrust (N) |
Rated stroke (mm) |
Rise time (S) |
Descent time (S) |
Operating frequency (c/h) |
|
BEd30/5 |
300 |
50 |
0.90 |
1200 |
|
|
BEd50/6 |
500 |
60 |
0.95 |
||
|
BEd50/12 |
120 |
1.28 |
0.90 |
900 |
|
|
BEd80/6 |
800 |
60 |
0.92 |
0.90 |
900 |
|
BEd80/12 |
120 |
1.64 |
1.0 |
900 |
|
|
BEd121/6 |
1250 |
60 |
0.92 |
0.90 |
900 |
|
BEd121/12 |
120 |
1.64 |
1.0 |
900 |
|
|
BEd201/6 |
2000 |
60 |
0.92 |
0.90 |
900 |
|
BEd201/12 |
120 |
1.64 |
1.0 |
900 |
|
|
BEd301/6 |
3000 |
60 |
0.92 |
0.90 |
900 |
|
BEd301/12 |
120 |
1.64 |
1.0 |
900 |
|
Table 2
|
Model |
Rated power (W) |
Rated current (A) |
Industrial frequency (Hz) |
Rated speed (r/min) |
Phase number |
Efficiency (%) |
Power factor |
Connection |
||
|
380V |
660V |
1140V |
||||||||
|
BEd30(380/660) |
130 |
0.47 |
0.27 |
/ |
50 |
2830 |
3 |
0.65 |
0.65 |
△/Y |
|
BEd30(660/1140) |
/ |
0.27 |
0.16 |
|||||||
|
BEd50(380/660) |
330 |
1.21 |
0.70 |
/ |
||||||
|
BEd50(660/1140) |
/ |
0.70 |
0.41 |
|||||||
|
BEd80(380/660) |
1.21 |
0.70 |
/ |
|||||||
|
BEd80(660/1140) |
/ |
0.70 |
0.41 |
|||||||
|
BEd121(380/660) |
1.21 |
0.70 |
/ |
|||||||
|
BEd121(660/1140) |
/ |
0.70 |
0.41 |
|||||||
|
BEd201(380/660) |
500 |
1.30 |
0.75 |
/ |
50 |
2830 |
3 |
0.77 |
0.76 |
△/Y |
|
BEd201(660/1140) |
/ |
0.75 |
0.44 |
|||||||
|
BEd301(380/660) |
500 |
1.30 |
0.75 |
/ |
||||||
|
BEd301(660/1140) |
/ |
0.75 |
0.44 |
|||||||
Technical features
- Working Current: When the thruster is operated at rated frequency, voltage and load to reach the rated stroke, its operating current shall not exceed the rated current specified in Table 1.
- Rise and Fall Time: When the thruster is installed vertically and operated at rated frequency, voltage and load, its rise and fall time shall not exceed the action time specified in Table 1.
- Maximum Thrust: When the thruster is installed vertically and operated at rated frequency and voltage, its maximum thrust shall not be less than 1.25 times the rated thrust specified in Table 1.
- Thrust and Stroke: At rated thrust, the thruster shall be capable of extending from the initial position to the end position within the specified time, and operate continuously for 15 minutes at the rated operating frequency without any abnormal phenomena. The stroke shall conform to the rated value with a tolerance of ±5%.
- Temperature Rise of Actuator: Under ambient air temperature not exceeding +40 °C, rated voltage, rated load and S1 continuous duty cycle, the temperature rise of the actuator housing shall not exceed 70 K.
- Power Supply Voltage Fluctuation: When the supply voltage fluctuates between 85% and 110% of the rated value (at rated frequency), the thruster's output thrust shall not be less than the rated thrust, and the push rod shall be able to extend to the rated stroke under rated load.
- Motor Performance: The performance of the electric motor shall comply with the requirements of the applicable standards.
- Key Design Requirements for Explosion-Proof Structure: In the structural design of the motor for this thruster series, full consideration is given to preventing the ignition of external explosive mixtures in the event of an internal explosion caused by the intrusion of explosive mixtures. Therefore, three critical conditions for ensuring explosion-proof performance are strictly controlled:
1. Mechanical strength of the motor housing
2. Length and gap dimensions of the explosion-proof mating surfaces of each housing component
3.Temperature limitation of the housing surface
Frequently Asked Questions
BEd Series Electro-Hydraulic Thruster
How does the BEd series explosion-proof electro-hydraulic thruster work?
+
-
It is mainly composed of an explosion-proof motor, intermediate flange, impeller, complete piston assembly, and other components.When powered on, the motor rotates to drive the impeller, which generates pressure oil. The pressure oil then drives the piston and connecting rod to move upward and maintain the thrust load after reaching the preset stroke.When the power is cut off, the motor and impeller stop rotating, and the piston and connecting rod return to their original position under external force.
How to Install the BEd Series Explosion-Proof Electro-Hydraulic Thruster?
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-
It is typically installed in a vertical orientation (with the motor positioned at the bottom). Angled or horizontal installation is also permissible, provided that the balance chamber faces upward and the piston rod is not subjected to radial forces.Prior to installation, inspect the explosion-proof marking, certificate number, and fastening bolts to ensure the explosion-proof housing is free from damage or defects.For electrical wiring, operations must be performed in accordance with the instructions provided inside the junction box. Ensure that the cable diameter matches the size of the rubber sealing ring, and maintain the junction box in a clean and fully sealed condition.
How to Perform Daily Maintenance on the BEd Series Explosion-Proof Electro-Hydraulic Thrusters?
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-
Conduct regular inspections to ensure the equipment functions properly and the wiring is secure. Check the oil every six months: if the oil has deteriorated or is contaminated with debris, it must be replaced; if the oil level is low, top it up in a timely manner. When refueling, move the push rod up and down repeatedly to bleed air from the system. Pay close attention to checking for oil leaks and seepage. Ensure all components of the brake system operate sensitively, and lubricate the shaft holes with oil once a week.
What should I do if the push rod of the BEd series explosion-proof electro-hydraulic thruster fails to extend?
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-
This problem may be caused by motor reversal or oil pump reversal, in which case you should check the wiring connections. It can also be attributed to air trapped inside the oil cylinder, which requires air bleeding to resolve. Other potential causes include an improper hydraulic oil level, contaminated oil, hydraulic cylinder leakage, or impeller detachment. For these circumstances, inspect the oil level and oil quality, examine the condition of the hydraulic cylinder, and disassemble the impeller for inspection if necessary.
How to Select Hydraulic Oil for the BEd Series Explosion-Proof Electro-Hydraulic Thruster?
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-
When the ambient temperature ranges from -20 °C to 40 °C, DB-25 transformer oil is recommended. When the ambient temperature ranges from 0 °C to 20 °C, YH-10 aviation hydraulic oil is recommended.
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