There is no better source for Crane Control Equipments than Electro Mechanik Co.

Products

 

Gear Control Equipments

 

D.S.L. Systems

 

Electro Hydraulic Thrustor

 

Thrustor Brake

 

Steel Grid Resistor

 

Cable Reeling Geared Coupling

 

Cable Reeling Drums

 

Limit Switches

 

Master Controllers

 

Radio Remote Control

 

Mill Duty Brakes

 

Electromagnetic Brakes

 
 
 
 
 
 
D.S.L. Systems
 
     
 
D.S.L. Systems
 
 
   
 
 
 
 

 
Electro Hydraulic Thrustor
 
     
 
Electro Hydraulic Thrustor
 
 
 

Application
"EMC" Electro Hydraulic Thrustor is robust and dependable, possessing the stamina needed for the toughest duty conditions imposed by unattended drives in any industry. Because of its extra-ordinary versatility it has wide applications in electrically driven Hoists, Cranes Elevators, Ropeways, Flap Valves Guillotine Machines, Conveyors, Steel Mills, etc.

Construction
The "EMC" Electro Hydraulic Thrustor consists of a cylinder filled with oil containing the centrifugal pump located at the bottom and the electric motor assembled on the top cover. The rotor shaft of the motor is extended vertically downwards into the cylinder and carries an impeller at its lower end. The top bearing of the motors are grease lubricated and the bottom bearing is splash lubricated from oil in the tank.

Operation
When the motor drives the impeller, it pumps the oil from the upper to the lower side of the piston. In model 50-2018 Thrustor, the whole motor and assembly move up during power stroke. Inall other models inside the cylinder, above the impeller is a piston with thrust rods connected by a cross bar which delivers the useful thrust. When the power to the motor is switched off, the impeller stops. Oil flows in the reverse direction through the stationary impeller and the load force the piston down.

Features
"EMC" Electro Hydraulic Thrustors deliver gentle thrust without any jerks, consuming very negligible power. It is rated for 100% continuous duty and can withstand many switching operations without over heating the motor. They can be fitted up to 100 from the vertical in either direction due to swivel mounting arrangement.

 
 
 
 
 

 
Thrustor Brake
 
     
 
Thrustor Brake
 
 
 

Operation
The braking torque is applied through the action of compression springs that operate the shoes when the current is interrupted. When the current is switched on the shoes is lifted from the drum, the electro-hydraulic thrustor unit acting against the pressure of the springs. The normal position of the brakes is, therefore, 'ON' (shoes gripping the drum), and the brake will return to this position when the current fails.

General Specification

Break Construction
The brakes are robustly made with few and simple working parts, The shoes and base of close grained cast iron and the fulcrum pins are of ground mild steel working in long, reamed bearings. The shoes are fitted with easily renewable woven, fibre, linings held by countersunk rivets, They are adjustable for wear and the pressure exerted by them is easily varid Pivoted shoes are standard on all thrustor-operated brakes.

Thrustors
These are standard electro-hydraulic supplied complete with their first filling of oil. This is 'insulating' oil, Grade 8.30 to British Standard 148, which is readily available at home and overseas. The thrustor cannot be injured by overload or under load.

Windings
All size can be wounded for 3 phase A.C. supplies up to 550 volts and outputs are given here for 50 and 60 C/S supplies. For lower supply frequencies the outputs will be reduced and enquiries should-be referred to us. All thrustors are continuously rated.

Enclosures
All standard units are totally enclosed. Dust seals are fitted as standard, but in extremely dusty situations, or for mounting in the open, a cowl or cover the thrustor is recommended.

Cable Entry
Standard units have tapped ¾ inch BS conduit thread. Supply leads must be flexible to allow free movement, and cables should have 18 inches free length and be not larger than three-core 7/0.029'' to avoid side drag.

Optional Special Features

Manual Release
A level for releasing the brake can be fitted at a small extra cost; this lever is self-resetting.

Hydraulic Over-Ride
Hydraulic control, which enables the brake to be applied by the operator by means of a lever or pedal while the thrustor is energized, can be fitted at extra cost. These brakes can be supplied complete with master and brake cylinder, copper pipe and pedal assembly.

Brake Drums
Brake drums, or drums combined with rigid or flexible couplings, can be supplied to customers' requirements at extra cost. A stout high duty cast-iron drum will be supplied with the brake, if specified. Drums are machined and keywayed ready for fitting to the motor shaft at cost.

Asbestos Linings
Asbestos linings can be fitted to any of the brakes listed in the table. These linings withstand higher temperatures but result in reduced torques, about 0%, because of their lower friction coefficient. They should only used when drum temperatures of over 2200F have to be tolerated and should be the subject of a special enquiry to us.

Choosing The Correct Brake
When selecting a brake from the rating table, opposite, it is important to consider not only the brake torque but also its duty, i.e. its frequency of application and the duration of each stop.

Torque 
When a large amount of store energy has to be dissipated or when the stopping times is specified, it will be necessary to caculate the torque from inertias and speeds of the moving parts. For many purposes, however the braking torque can be related to the torque being transmitted. The full load torque of a shaft transmitting a known horsepower is given by:
Torque (lb-ft.) = hp x 5250 
rev/min of shaft.
Usually, sufficient will be known about the drive to enable a suitable brake torque to be determined.

Duty
The bake must be chosen with consideration of its intended duty to ensure that the linings will not overheat or wear down too quickly. Selection of a brake for torque only would not ensure this. Since the speed of the drum will also affect the rate at which the drum can dissipate the absorbed energy without overheating. The higher the drum speed for a given torque, the higher will be the rate of energy dissipation in the brake linings during each stopping period the rate being expressible as a horsepower. The column headed 'Nominal horsepower based on linings' in the table is intended as a rough guide to the horsepower of the motor for which a brake is suitable when the duty is equivalent to 'normal' crane duty, i.e. not more than 120 operations per hour continuously applied and with a stopping time not exceeding about one second. If the duty of the brake is less than this 'normal' the horsepower given in the table can be increased. If however, the frequency of application is greater or the stopping time is longer, a larger brake may have to be used; asbestos linings can be fitted and a higher drum temperature accepted with a lower torque. Details of brakes with non-standard features may be obtained from us.
"EMC" THRUSTOR OPERATED BRAKES
AC THRUSTOR-OPERATED BRAKES have a wide application; they can be used with such machinery as electrically driven hoists, cranes elevators, ropeways, machine tools, mixers and laundry machinery.

 
 
 
 
 

 
Steel Grid Resistor
 
     
 
Steel Grid Resistor
 
 
 

Original Non Breakable resistor met with instant
favour operates continuously in adverse conditions
such as Dust, Moisture & Vibration

Wire Grid or Punched Grid are corrosion resisting
chromium alloy S.S.304

 
 
 
 
 

 
Cable Reeling Geared Coupling
 
     
 
Cable Reeling Geared Coupling
 
 
 

Geared Coupling in Standard sizes from EM 100 to 118, Full Gears ad half gear & half rigid coupling, are also available in same size. Geared Brake Drum couplings are Drum dia of 100 to 500 can be
supplied.

 
 
 
 
 

 
Cable Reeling Drums
 
     
 
Cable Reeling Drums
 
 
 

Cable Reeling Drums, spring operated up to 30 meters in different Drum Sizes based on cable size.

 
 
 
 
 

 
Limit Switches
 
     
 
Limit Switches
 
 
 

Roller Level type, Rotary Geared with Ratio 48 : 1 &
60 : 1 No. of contacts up to 4, Rating 10 A. & 40A.
Series Limit Switch up to150 Amp.
The Limit Switch contact block is of high grade
melamine capable of withstanding heavy arcing. The
tips are made of high grade silver cadmium oxide
alloy.

 
 
 
 
 

 
Master Controllers
 
     
 
Master Controllers
 
 
 

Cam type, Contacts get actuated by Cams on 
operating sequence, shaft to the desired sequence
and are wired to contactor panel. IP41 & IP54
enclosur. Options feature like dead means handle,
spring return and twin controllers can be supplied.
Long Life, Simple Maintenance, Wide Electrical
Clearance.
Size-1 upto 6 contacts.
Size-2 upto 12 contacts.
Size-3 upto 18 contacts.
Size-4 upto 24 contacts.

 

Application

The following arrangements show the most common ways of installing the reels. For other applications please consult our technical sales department.

 
 
 
 
 

 
Radio Remote Control
 
     
 
Radio Remote Control
 
 
 

Water / Dust proof IP 65 Strong Casing
Adapts to different applications
Specification :
Sections-assembled push buttons, easy to upgrade 
to different models.
Gold plated switches, specially for industrial 
used, long stage with high sensivity
PC casing, extremely shock, water, dust proof
Extra-protection : International standard EMS-stop push buttons
Features :
Securitycoad : 256 sets
Output power : Less than 1mW
Frequency Control : Quartz crystals

 
 
 
 
 

 
Mill Duty Brakes
 
     
 
Mill Duty Brakes
 
 
 
  1. D C Brakes, IPSS/AISE standards,
  2. Dia 100 mm to 800 mm with breaking torque
  3. ranging from 6 Kgm. to 700 Kgm.
  4. Thruster Brakes with Electro Hydraulic Thrusters having thrusts - of 18 Kg 228 Kg
     
    Model No.
    Drum Dia 
    (mm)
    Brake Shoe Width (mm)
    Thrust Braking (kgs)
    Torque (kg mtr)
    94-1021
    100
    57
    18
    6.0
    94-1521
    150
    70
    18
    10.0
    94-2021
    200
    88
    18
    20.0
    94-2022
    200
    88
    34
    30.0
    94-2023
    200
    88
    45
    40.0
    94-2521
    250
    108
    18
    28.0
    94-2522
    250
    108
    34
    44.0
    94-2523
    250
    108
    45
    68.0
    94-3021
    300
    127
    18
    44.0
    94-3022
    300
    127
    34
    60.0
    94-3023
    300
    127
    45
    70.0
    94-3721
    375
    152
    18
    52.0
    94-4021
    400
    152
    18
    58.0
    94-4022
    400
    152
    34
    90.0
    94-4023
    400
    152
    45
    120.0
    94-4024
    400
    152
    68
    170.0
    94-4025
    400
    152
    114
    280.0
    94-5024
    500
    190
    68
    225.0
    94-5025
    500
    190
    114
    370.0
    94-6024
    600
    228
    68
    340.0
    94-6025
    600
    228
    114
    570.0

     
 
 
 
 
 

 
Electromagnetic Brakes
 
     
 
Electromagnetic Brakes
 
 
 
  1. Instant Operation
  2. Maximunm No. of Operations 240
  3. Requires Stroke Adjustment
  4. Sizes 100 mm to 400 mm
  5. Braking Torque - 2 Kgm. to 65 Kgm.
  6. Disk Brakes for Hoist, with torque rating
  7. upto 35 Kgm
  8. Available in single phase 220V, 440V & 
  9. 3 phase 440V
     
    DRUM DIA
    50 % RATING
    100 % RATING
    APPROX POWER
    MODEL
    TORQUE
    MODEL
    TORQUE
    COSNUMPTION-VA
               
    100
    90-10-C1
    220
    90-10-C2
    184
    165
    150
    90-15-C1
    760
    90-15-C2
    650
    165
    200
    90-20-C1
    1775
    90-20-C2
    1500
    280
    250
    90-25-C1
    2270
    90-25-C2
    1930
    335
    300
    90-30-C1
    4570
    90-30-C2
    3880
    350
    375
    90-37-C1
    6900
    90-37-C2
    5860
    600