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Brake Systems Application Guide

INDEX

INTRODUCTION

BRAKE SUMMARY AND KEY FEATURES

TYPICAL DESCRIPTION AND APPLICATIONS HYDRAULIC BRAKES

4-7

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

OVERHAULING LOADS

HYDRAULIC BRAKE SELECTION FOR BRIDGE BRAKES

HYDRAULIC BRAKE TORQUE RATINGS AND THERMAL CAPACITIES

DC MAGNETIC SHOE BRAKE TORQUE RATINGS AND THERMAL CAPACITIES

NOTE: Pages 9 through 14 describe brake calculations that in general apply to all style
Gemco brakes. The hydraulic brake selection, pages 15 through 19 are specifically for
hydraulic brakes used as bridge brakes for overhead cranes.

Содержание Gemco TM 43

Страница 1: ......

Страница 2: ...10 SELECTING BRAKE SIZE BASED ON LOAD DATA 10 OVERHAULING LOAD TORQUE 12 BRAKE THERMAL CAPACITY 13 OVERHAULING LOADS 14 HYDRAULIC BRAKE SELECTION FOR BRIDGE BRAKES 15 HYDRAULIC BRAKE TORQUE RATINGS AN...

Страница 3: ...Gemco For more than 40 years Gemco has been an acknowledged leader in brake systems technology for heavy duty industrial applications BRAKE SYSTEM KEY FEATURES SUMMARY H HM AH AHM CB TM ET S DB Hydra...

Страница 4: ...ies and heavy duty cranes The hydraulic brakes described in the following pages have been utilized for many years in steel mill cranes shipyards and other applications where an operator control stop i...

Страница 5: ...LICATIONS Large overhead crane brakes for ladle cranes and other hot metal cranes usually four brakes systems DESCRIPTION Type AH H RC Air Hydraulic Hydraulic Remote Control brake systems with operato...

Страница 6: ...systems 6 through 8 brake TYPICAL APPLICATIONS Any remote radio or pendent control brake requirement for bridge brakes DESCRIPTION Type AH ERC Conversion package adds remote control capability to exis...

Страница 7: ...ng for outdoor crane applications DESCRIPTION Type TMH System for remote operation of D C Electric Brake assemblies Auxiliary cab control also allows hydraulic operation for controlled braking sizes a...

Страница 8: ...er brakes and lock and dam motor brakes DESCRIPTION Type ET brake spring applied electrical release by A C or D C electro thrust mechanism TYPICAL APPLICATIONS Bridge brakes lock and dam project stack...

Страница 9: ...e torque required to hold the load at rest SELECTING BRAKE TORQUE BASED ON MOTOR DATA The full load torque of a motor is a function of horsepower and speed and is commonly used to determine a brake to...

Страница 10: ...quired the brake should be selected based on the total inertia of the load Total system inertia reflected to the brake shaft can be expressed as follows WKT 2 WKB 2 WKM 2 WKL 2 where WKT 2 Total refle...

Страница 11: ...ollowing formula WKT 2 x NB Td 308 x t where Td Average dynamic braking torque lb ft WKT 2 Total inertia reflected to brake lb ft2 NB Shaft speed at brake RPM t Desired stopping time sec 308 Constant...

Страница 12: ...RQUE Applications with a descending load such as crane hoists elevators etc require a brake with sufficient torque both to stop the load and to hold it at rest The total system inertia reflected to th...

Страница 13: ...two types of thermal capacity The first is referred to as the maximum energy the brake can absorb in one stop or emergency stop The second is the heat dissipation capability of the brake if it is for...

Страница 14: ...PE In general a brake will repetitively stop a load at the duty cycle that the electric motor can repetitively start the load For rotating or linear loads the rate at which a brake is required to abs...

Страница 15: ...t WE _____Tons Full load crane weight WL _____Tons Max bridge speed FPM _____Ft Min Stops per hour N _____Number value Track wheel diameter DIA _____Inches Gear ratio brake shaft to track wheel R ____...

Страница 16: ...E RATINGS AND THERMAL CAPACITIES Using the table below select the smallest brake size that will exceed KE and TMX calculations listed above TMN calculations for air powered systems should be above Min...

Страница 17: ...ations to establish the prelimary brake size BRAKE SIZE BRAKE WHEEL INERTIA 6 x 3 55 lb Ft2 8 x 3 1 41 Lb Ft2 10 x 4 4 25 Lb Ft2 14 x 6 24 20 Lb Ft2 18 x 8 75 73 Lb Ft2 2 Record the following data fro...

Страница 18: ...The chart below shows the dynamic torque ranges developed by air powered hydraulic systems The maximum torques shown are developed by a 70 lb force applied on the air treadle on Type A H systems or ap...

Страница 19: ...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 1...

Страница 20: ...WHEEL DIAMETER inches TORQUE LB FT Max ET8 8 100 ET10 10 200 ET13 13 550 ET16 16 1000 ET19 19 2000 ET23 23 4000 ET30 30 9000 Wheel Size Ft Lb per Hour 4 5 396 000 6 0 660 000 8 0 990 000 10 1 716 000...

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