Choosing the right equipment for your lifting application

by Apr 5, 2019Uncategorized

Choosing the right equipment for your lifting application

AC Lift products have been designed to perform specific tasks. Customer satisfaction is paramount and it is important that consideration be given to all of the following conditions to insure the proper lift is matched to a specific job application.

Lowered Height

Model selection considerations should include maximum lowered height for application. For ground level operations, consider pit mounting of the unit.

Raised Height

Model selection considerations should include maximum raised height for application. For higher level operations, consider a double high model.

Vertical Travel

Decide how high a load needs to be raised and note the distance. Specifications for all lifts show “standard vertical travel.” Distances are expressed in inches. Select one of these standard travels (or the next higher travel) from the specification tables shown for the product being considered.

Single Scissor Lift Also referred to as “Single Stage” type with power unit normally mounted between legs. Depending on application, can be combined into Double Long, Double Wide or even Double High.

Double Long Scissor Lift For applications requiring very long platforms. Combination consists of two standard scissors lifts with a common platform and base. Single power unit controls both lifts. Rated maximum capacity for combination is 80% of combined catalogued capacities of single scissors lifts selected. Consult Sales for pricing.

Double Wide Scissors Lift For applications requiring very wide platforms. Combination consists of two standard scissors lifts mounted side-by-side with a common platform and base. Single power unit controls both sets of lifts. Rated maximum capacity of combination is 80% of combined catalogued capacities of single scissors lifts selected.

Double High Scissor Lift For applications requiring high travel with relatively short platforms. Combination consists of two standard lifts stacked one on top of the other. The capacity rating is that of the upper lift. Lower lift must be sized to raise rated load plus weight of upper lift. Single power unit in lower lift controls both sets of lifts. Travels which exceed 60” may require guarding – consult sales. Double pantograph models are also available.

Lifting Capacity

Lifting capacity is the gross weight a lift is required to raise. Determine the maximum weight that must be handled. Select a “standard lifting capacity” for one of the products from the specification table. When doing so, be sure to consider the following:

Side-End Load: The amount of static load that can be applied over the edge of a lift platform in the fully raised position.

Axle Load: Rolling load which takes into account the added forces applied to the lift through momentum and impact of the wheels.

Platform Size

Determine overall dimensions which the largest load will occupy and attempt to select a “Standard Platform Size” from an product specification table. If a non-standard platform size is required, find the minimum and maximum size of the platform for a particular model lift. Be sure this size falls within the available range. Factors affecting platform size are lifting capacity, vertical travel, pit installation requirements, mounting of various accessories, etc. Electric toe guards or hanging toe indicator bars are required on units equipped with straight side platforms. Toe protection is required per ANSI MH29.1.

Oversize Platform

Will also require de-rating. The end or side load capacity must be reduced by 2% for each additional inch that is added to the Standard Minimum Platform width or length.

Pit Mounting

For pit mounted installations, OSHA requires platforms be equipped with toe protection, (i.e. beveled toe guards, electric toe guards or hanging toe indicator bars). The minimum lowered height is noted in the product matrix for each model; however roller shades or accordion skirting may increase the lowered height of the unit. Pit mounted turntables require bevel toe guards on lift, skirting on turntable and an orientation interlock if the turntable platform dimensions are equal to or less than the lift platform dimensions. If turntable platform size exceeds lift platform size, beveled toe guards on turntable and an orientation interlock are required.

Operating Speed

Product specification tables will provide the standard operating speed for a unit. If different requirements are needed, request information from sales.

Duty Cycles

Standard duty: for general industrial applications. Number of cycles should not exceed 100,000 per year. Equipment downtime does not adversely affect production under these conditions. (The “frequency” of lift operations should not exceed standard shown below.)

High Cycle: When total number of cycles per year exceeds 100,000. When possible equipment downtime could seriously affect production. Speed and cycle frequency determines size of power unit, motor horsepower, pump output, and tank capacity to dissipate heat buildup. Power units are usually built for continuously running operation. Special pivot bearings are used which have longer life at high cycles. Units are designed to accommodate fatigue stress and extra wear.

High Speed: When required speed exceeds standard catalogued speed, larger pump and motors are used.

Frequency of Lift Operations

Intermittent duty rated motors are used in all standard applications and are rated for a frequency of operation not exceeding one full lift every 2 minutes. Failure to observe these frequencies could cause motor to overheat.

If “jogging” is required, as a part of a feeding operation, be sure jogs are limited to one 2 second jog every 10 seconds for a limited time, but not to exceed 200 motor starts an hour. If application should require greater frequency, check with the sales department for a high cycle rated special lift, which is equipped with a continuous-running power unit. (NOTE: All internally mounted power units are equipped with oil and power cord. Externally mounted power unit does not include either.)

Turntables

Stand-alone:

  1. All standard turntable capacities assume that the load on the turntable is uniformly distributed and that the C.G. of the load is placed within 10″ of the center pin.
  2. Standard turntables are not designed to withstand true edge or axle loading. If edge or axle loading is anticipated, additional turntable platform support at the edges must be considered and provided.
  3. The smallest turntable platform size with bevel toe guards is 44″ x 44″ to adequately clear the support rollers mounted to the standard 24″ x 24″ turntable base plate.
  4. Turntables are available with optional detents, locks, physical stops, limit switch signals, or powered drive.

Mounted to Lifts:

  1. If the lift platform provided is the standard minimum size (with or without bevel toe guards), the lift capacity does not have to be de-rated for the mounting of manual turntables up to 48″ x 48″ in size.
  2. Regardless of platform size, the lift capacity must be derated by 500 lbs. for the mounting of catalogued powered turntables which exceed 36″ x 36″ in size.
  3. As a rule, turntable platform dimensions must not exceed either maximum allowable platform dimension of the lift that it mounts to. Exceptions will be reviewed and approved by Engineering on an application by application basis.
  4. Turntables that mount to lifts in pits must be at least 10″ in lowered height to accommodate bevel toe guards and a “home position” limit switch on the turntable platform.

Tilters

Stand-alone

  1. A tilter application form & approval is required if at least one of the following conditions exist:
    1. Tilt angle in excess of 45 degrees, or
    2. Platform requirements exceed standard, or
    3. Off-center loading along the width of the platform is required, or
    4. Container size exceeds, in any dimension, 50″W x 50″L x 55″H without a pallet or 50″W x 48″L x 48″H on a pallet up to 5″H, or
    5. Any container load (including pallet) which has a height/length ratio greater than 1.0

Mounted to Lifts

  1. Regardless of platform size, the lifting capacity must be de-rated by 500 lbs. for the mounting of catalogued tilters.
  2. Tilter platform width must not exceed the maximum allowable lift platform width.
  3. Tilters mounted to lifts must tilt over the roller end of the lift, never over the side. Total load plus tilter weight must not exceed the maximum allowable end load of the lift.

Power Supply

Standard for single phase horsepower units is 230V/1PH/60Hz. 115V/1PH/60hz is also available. Standard for three phase power units is 208/230/460V/3PH/60Hz. (NOTE: Always specify power supply requirements. Proper operation on 115 Volt power involves the provision of a separate 30 amp or larger circuit and adequate wiring to assure an actual 115 Volts at the control box during operation under full load.)

Controls

24VAC is standard control voltage, 115VAC and 24VDC are available upon request. Where applicable, standard controls include an UP/DOWN constant pressure pushbutton station. Also available upon request are foot, key and automatic (PLC) operating devices.

Inplant products provide various lifting , tilting and turning solutions that increase productivity and safety in the workplace.

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