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Related Manuals for Ametek Gemco H Series
Summary of Contents for Ametek Gemco H Series
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Page 2: Table Of Contents
Brake Systems Application Guide INDEX INTRODUCTION BRAKE SUMMARY AND KEY FEATURES TYPICAL DESCRIPTION AND APPLICATIONS HYDRAULIC BRAKES TYPICAL DESCRIPTION AND APPLICATIONS ELECTRIC BRAKES BRAKE CALCULATIONS SELECTING BRAKE TORQUE BASED ON MOTOR DATA CRANE HOIST BRAKING TORQUE CRANE TROLLEY BRAKING TORQUE SELECTING BRAKE SIZE BASED ON LOAD DATA OVERHAULING LOAD TORQUE BRAKE THERMAL CAPACITY... -
Page 3: Brake Summary And Key Features
Brake Systems Application Guide BRAKE SUMMARY AND KEY FEATURES HYDRAULIC, MAGNETIC, AND ELECTRO-THRUST BRAKE SYSTEMS Gemco Industrial Brakes stop virtually any type of industrial machine. Applications such as indoor and outdoor bridge cranes, gantries, heavy-duty cranes, high duty cycle cranes, lock and dam projects, stacker reclaimers, commercial laundry equipment, and heavy-duty industrial transfer equipment are just some of the uses for Gemco Industrial Brakes. -
Page 4: Typical Description And Applications Hydraulic Brakes
Brake Systems Application Guide TYPICAL DESCRIPTION AND APPLICATIONS HYDRAULIC BRAKES DESCRIPTION: Type H manually operated hydraulic brakes for smooth controlled service stops. Sizes are 6” through 18” with torque ratings 150 to 900 ft-lbs.; one and two brake systems. TYPICAL APPLICATIONS: Bridge brakes for overhead, gantries and heavy duty cranes. - Page 5 Brake Systems Application Guide DESCRIPTION: Type AH-ARC (Air/Hydraulic Remote Control) brake system for stopping large loads. Sizes one, two and four brake systems - 6” through 18” . TYPICAL APPLICATIONS: Large overhead crane brakes for ladle cranes and other hot metal cranes, usually four brakes systems.
- Page 6 Brake Systems Application Guide DESCRIPTION: Type AH-ERC systems operating hydraulic brakes by radio or pendent control. Size one, two and four brake systems - 6” through 8” brake. TYPICAL APPLICATIONS: Any remote radio or pendent control brake requirement for bridge brakes. DESCRIPTION: Type AH-ERC...
- Page 7 Brake Systems Application Guide DESCRIPTION: Type AHM System. All three of the previously described air over hydraulic systems can be provided with parking. (AHM- ARC, AHM-HRC, and AHM- ERC). TYPICAL APPLICATIONS: As previously described but with parking for “ outdoor crane” applications.
- Page 8 Brake Systems Application Guide DESCRIPTION: Type CB brakes spring applied electrically released via solenoid. Sizes, 4 ½ to 10’ , general duty. TYPICAL APPLICATIONS: Light duty crane bridge brakes and holding brakes. DESCRIPTION: Type TM brakes spring applied electrically released via D.C. magnet coils. AISE sizes, Mill Duty.
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Page 9: Selecting Brake Torque Based On Motor Data
Brake Systems Application Guide INTRODUCTION When selecting the proper brake for a specific application, there are several factors to consider; a few that need to be reviewed are brake torque, stopping time and/or deceleration rates, brake mounting, brake location, thermal rating, environment, and brake style. The brake systems manufactured by Gemco Industrial Brake Products are external friction brakes. -
Page 10: Crane Trolley Braking Torque
Brake Systems Application Guide CRANE TROLLEY BRAKING TORQUE Crane trolley brakes are typically sized with a torque rating less than the motor’ s full load torque (service factor less than 1.0) to provide a longer stopping time or a “ soft stop.” Overhead crane trolley brakes are minimized to prevent sway of the hook and load. - Page 11 Brake Systems Application Guide Horizontal Linear Motion: = W (V / 2pN Equivalent inertia of moving load where: reflected to brake shaft (lb-ft = Weight of linear load (Ib) = Linear velocity of load (ft/mm) = Shaft speed at brake (RPM) With the total system inertia calculated, the required average dynamic torque for a desired stopping time can be calculated using the following formula: 308 x t...
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Page 12: Overhauling Load Torque
Brake Systems Application Guide For linear applications, the dynamic braking torque can be calculated directly using the following formula: W x V x r g x t where: T Average dynamic braking torque (lb-ft) Total weight of linear moving load (lb.) Linear velocity of load (ft/sec.) Gravitational acceleration constant (32.2 ft/sec2) Desired stopping time (sec.) -
Page 13: Brake Thermal Capacity
Brake Systems Application Guide The total dynamic torque required for an overhauling load is the sum of T and T , as follows: where: = Total dynamic torque for descending load BRAKE THERMAL CAPACITY When a brake stops a load, the energy required to stop is converted to heat. This heat is absorbed by the brake and the wheel. -
Page 14: Overhauling Loads
Brake Systems Application Guide OVERHAULING LOADS In the case of overhauling loads, both the kinetic energy of the linear and rotating loads and the potential energy transformed into kinetic energy by the change in height must be considered. The potential energy transformed to kinetic energy is determined as follows: Where: Change in potential energy, (ft-Ib) Weight of overhauling load (Ib) - Page 15 Brake Systems Application Guide BRAKE SELECTION FOR BRIDGE BRAKES The following formulas apply for calculating linear loads such as bridge brake applications: W x V W x V x r 2 x g g x t where: Kinetic energy (ft-lb) Weight (lb.) Linear velocity (ft/sec) Gravitational constant (32.2 ft/sec...
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Page 16: Hydraulic Brake Torque Ratings And Thermal Capacities
Brake Systems Application Guide The kinetic energy and torque calculations can be stated in terms of crane specifications as follows: Kinetic energy absorption rate, per brake per hour: N x (FPM) x (WE + WL) 232 x NB Minimum stopping torque (to stop empty crane at minimum deceleration rate): 2.59 x WE x d x DIA NB x R... - Page 17 Brake Systems Application Guide Maximum stops per hour can be calculated using the following: N x (Max. KE per brake per hour) Max. stops/hr. where: (Max. KE per brake per hour) = Value for brake size as shown in table above. The additional torque required to stop the drive rotor and the brake wheel inertia is normally insignificant and is ignored when the gear ratio (R) is less than about 10 x 1.
- Page 18 Brake Systems Application Guide 5.Calculate Total Minimum and Maximum Torques: (previous) ___________Lb-Ft. T (previous) ___________Lb-Ft. + ___________ Lb-Ft. T Lb-Ft. ___________ Lb-Ft. T Lb-Ft. 6.Check to determine that T is still within the torque limits of the brake size selected. If necessary, recalculate the problem based on alternate brake size and brakewheel inertia.
- Page 19 Brake Systems Application Guide Static holding torque values tabulated below are those developed by the parking spring on the Type HM brakes. The brake must be correctly adjusted in order to get the holding torque tabulated. Brake Size 6 x 3 8 x 3 10 x 4 14 x 6...
- Page 20 660,000 6.0” DB12 990,000 8.0” 1,716,000 10” DB14 3,300,000 13” 16” 5,016,000 7,425,000 DB17 19” 23” 10,890,000 30” 18,150,000 ® AMETEK PATRIOT SENSORS 6380 BROCKWAY ROAD PECK, MI 48466-9766 USA • 800-325-8074 810-378-5511 Fax 810-378-5516 • • www.patriotsensors.com • www.ametek.com...