Duff-Norton SK-2389 Manual de instrucciones de instalación, funcionamiento y mantenimiento - Página 3

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Table 2.

4800 and 9400 Series

Standard Actuator

Upright

Model No.

Inverted

Special Actuator

Upright

Model No.

Inverted

Rated Load (tons)

Torque at

Std Ratio

Full Load* (in-lbs)

Optional

Actuator Efficiency Std Ratio

Rating (%)

Optional

Closed Height (in)**

Weight with Base

Raise of 6˝ (lbs)

Note:

Additional specifications are same as for Series 1800 and 9000. See Table 1.

For loads from 25% to 100% of actuator load rating. Torque requirements are approximately proportional to the load.

Closed heights are for standard upright top plate models and may vary with different screw end, inverted models, or when bellows boot is used.

Table 3.

Decimal Ratios

Standard Actuator Upright

Model No.

Inverted

Special Actuator

Upright

Model No.

Inverted

Rated Load (tons)

Lifting Screw (inches)

Worm Gear Ratios

Turns of Worm For 1˝ Raise

Torque at Full Load (in-lbs)

Actuator Efficiency Rating (%)

Maximum H.P. Per Actuator

Note:

All other data for these models same as shown in Table 1.

1-4 Important Precautions

In order to ensure that Duff-Norton actuators

provide good service over a period of years the

following precautions should be taken:

1. Select an actuator that has a load rating greater

than the maximum load that may be imposed on

it.

2. The structure on which the actuator is mounted

should have ample strength to carry the maxi-

mum load, and should be rigid enough to pre-

vent undue deflection or distortion of the actua-

tor supporting members.

3. It is essential that the actuator be carefully

aligned during installation so that the lifting

screws are perfectly plumb and the connecting

shafts are exactly in line with the worm shafts.

After the actuators, shafting, gear boxes, etc.,

are coupled together, it should be possible to

turn the main drive shaft by hand. If there are no

signs of binding or misalignment, that actuator

system is then ready for normal operation.

4. Actuators should have a greater raise than is

needed in the actual application. Should it be

necessary to operate the actuator at the ex-

treme limits of travel, it should be done cau-

tiously.

Do not allow actuator travel to go beyond

4802 & 9402

9405

9410

4801 & 9401

9404

9409

5802 & 10402

10405

10410

5801 & 10401

10404

10409

135

500

1045

205

905

19.6

19.9

19.8

11.9

10.9

12.6

5 1/4

7 1/4

1802 & 9002

1801 & 9001

2002 & 10002

10005

2001 & 10001

10004

1˝ Dia.

1 1/2˝ Dia.

.250 Pitch

Acme

25:1

100

13.2

1/2

CAUTION

9415

9420

9414

9419

10415

10420

10414

10419

1573

2255

1290

1320

18.0

17.6

11.0

10.8

9 1/2

101

9005

9010

9004

9009

10010

10009

2˝ Dia.

2 1/4˝ Dia.

.250 Pitch

Acme

25:1

100

175

370

9.1

8.6

3/4

1 1/2

specified (catalog) closed height, or serious

damage to internal mechanism may result.

Refer to table of specifications (par. 1-3) for

closed heights of respective units.

5. The worm shaft speed for these actuators

should not exceed 500 RPM for heavy loads,

1200 RPM for light loads of one-fourth (or less)

of the actuators load rating.

6. The lifting screw should not be permitted to

accumulate dust and grit on the threads. If

possible, lifting screws should be returned to

closed position when not in use.

Where lifting screws are not protected from

airborne dirt, dust, etc., bellows boots should

be used. Inspect frequently at regular internals

to be certain that a lubricating film is present.

Lifting screws should never be run dry.

7. When using an 1800 (2000) or 9000 (10000)

Series Actuator, a periodic check of backlash of

the lifting screw thread is recommended to

check wear of the worm gear internal threads.

The normal backlash on a new unit of this type

is approximately .010 inch. Backlash of 50% or

more of the thread thickness indicates the need

to replace the worm gear.

The 4800 and 9400 Series Anti-backlash Actua-

9425

9435

4850 & 9450

9424

9434

4849 & 9449

10425

10435

5850 & 10450

10424

10434

5849 & 10449

1320

4400

4620

1320

2640

4620

13.4

13.7

12.4

8.3

7.7

7.3

197

250

440

9015

9020

9014

9019

10015

10020

10014

10019

2 1/2˝ Dia.

.250 Pitch

Acme

25:1

100

640

925

7.5

6.9

1 1/2

CAUTION

9475

9474

10475

10474

13200

7260

11.3

6.8

18 1/2

700

9025

9024

10025

10024

3˝ Dia.

.320 Pitch

Square

32:1

100

1500

5.3

2 1/2