Port Lifting Machine Design

Contents

CONTENTS

I. PRELIMINARY CALCULATIONS OF CRANE MECHANISMS:

1. Load lifting mechanism

1.1 Initial data

1.2 Selection of kinematic circuit

1.3 Hook Suspension Selection

1.4 Rope Selection

1.5 Sizing Cable Blocks

1.6 Sizing of rope drum

1.7 Calculation of rope attachment to drum

1.8 Calculation of drum axis for strength

1.9 Calculation of bolts connecting the gear rim to the drum

1.10 Electric motor selection

1.11 Gear selection (gearbox)

1.12 Selection of couplings

1.13 Brake selection

2. Crane movement mechanism

2.1 Initial data

2.2 Selection of kinematic circuit

2.3 Determination of static loads on running wheels

2.4 Selection of running wheels

2.5 Selection of wheel units

2.6 Rail Selection

2.7 Determination of crane movement resistance

2.8 Electric motor selection

2.9 Gear selection (gearbox)

2.10 Selection of couplings

2.11 Brake selection

II. CHECK CALCULATIONS OF CRANE MECHANISMS:

1. Load lifting mechanism

1.1 Motor check for acceleration time

1.2 Check of electric motor for heating

2. Crane movement mechanism

2.1 Check of electric motor for acceleration time

2.2 Check of braking time

2.3 Check of track wheel engagement margin with rails

III. SAFETY INSTRUMENT SELECTION AND DESCRIPTION

Recommended Literature

1.1 Initial data:

Lifting capacity Q = 15 t

Lifting height of load H = 15 m

Load lifting speed Vpod = 20 m/min

Crane service life 30 years

Lifting mechanism operation mode: medium

Working conditions: indoors

Iii. selection and description of the safety device.

To protect the lifting mechanism and the load-bearing structure of the bridge crane from excessive loads, load-carrying capacity limiters are used. The load limiter is a device for emergency disconnection of the mechanism drive when lifting a load whose mass exceeds the permissible value.

Select eccentric load limiter with spring balancing. It has housing in which equalizing unit is installed on lever. Lever rests on balancing spring, which is located on rod, which is pivotally fixed on post. Pusher interacting with end switch lever is coupled with lever.