Heavy-Duty Shock Absorbers

Deceleration Technology

LDS 75

ONLINE

Calculation and 2D / 3D CAD Download

V

F

S

m

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Operating Principle Steel Cap

Operating Principle LDS models are filled with hydraulic oil and nitrogen. This construction allows the reset of the piston with a low force.

Piston rod

Filling Valve for Nitrogen

When the piston rod is pushed into the cylinder, the piston displaces the oil through different sized holes which are progressively closed off. As a result the speed of the piston rod proportionally decreases to the stroke covered. The displaced oil from the volume of the piston rod is compensated by an accumulator of nitrogen, which is above the oil. During the stroke the pressure in the nitrogen is increased. When the mass is released the piston rod is returned by the pressure of the nitrogen.

Seal Bushing

Housing

Piston Pressure Tube

Throttle orifices

Oil

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20

ø22

FH ø45

32

ø130

170 125

ø70

Stroke

B

125

A

170

FV 20

Sensor (Option)

ø130

Stroke

B A

20

FB Stroke

170

ø22 40 24

24

216

D

255

Rear flange recommended only for shock absorbers up to 300 mm stroke!

øPiston

Stroke

Energy/Stroke

max. Counterforce

mm

mm

Nm

N

Emergency

max. angular tolerance ° Constant Load

FV / FH kg

Weight FB kg

Mounting: horizontal A mm

B mm

D mm

A mm

Mounting: vertical B mm

D mm

LDS-75-050

75

50

9600

240000

2,0

2,0

23

29

318

226

258

318

226

258

LDS-75-075

75

75

14400

240000

2,0

1,5

25

31

365

247

279

365

247

279

LDS-75-100

75

100

19200

240000

2,0

1,5

26

32

418

276

308

418

276

308

LDS-75-125

75

125

24000

240000

2,0

1,5

27

33

468

301

333

468

301

333

LDS-75-150

75

150

28800

240000

2,0

1,5

29

35

540

348

380

540

348

380

LDS-75-200

75

200

38400

240000

1,5

1,0

31

37

618

376

408

718

476

508

LDS-75-250

75

250

48000

240000

1,5

0,5

34

40

718

426

458

868

576

608

LDS-75-300

75

300

57600

240000

1,5

0,5

37

43

818

476

508

918

576

608

LDS-75-350

75

350

67200

240000

1,5

0,5

40

46

969

576

608

1071

678

710

LDS-75-400

75

400

76800

240000

1,5

0,5

43

49

1070

627

659

1172

729

761

LDS-75-450

75

450

86400

240000

1,5

0,5

45

51

1171

678

710

1323

830

862

LDS-75-500

75

500

94000

235000

1,5

0,5

50

56

1272

729

761

1475

932

964

LDS-75-600

75

600

112800

235000

1,0

0,5

56

62

1472

830

862

1675

1033

1065

LDS-75-700

75

700

136900

230000

1,0

0,5

62

68

1675

932

964

1925

1182

1214

LDS-75-800

75

800

134000

195000

1,0

0,5

67

73

1876

1033

1065

2025

1182

1214

LDS-75-900

75

900

134000

185000

1,0

0,5

73

79

2125

1182

1214

2425

1482

1514

LDS-75-1000

75

1000

134000

170000

1,0

0,5

79

85

2324

1282

1314

2604

1562

1594

LDS-75-1100

75

1100

134000

160000

1,0

0,5

85

91

2525

1382

1414

2875

1732

1764

LDS-75-1200

75

1200

134000

150000

1,0

0,5

91

97

2724

1482

1514

3140

1898

1930

LDS-75-1400

75

1400

134000

140000

0,8

0,3

102

107

3275

1832

1864

3625

2182

2214

LDS-75-1500

75

1500

130000

140000

0,8

0,3

105

110

3491

1948

1980

3875

2332

2364

LDS-75-1600

75

1600

120000

140000

0,6

0,2

120

125

3725

2082

2114

4075

2432

2464

LDS-75-1800

75

1800

120000

140000

0,5

0,2

140

145

4175

2332

2364

4575

2732

2764

Adjustmend

The shock absorbers LDS-75 are non adjustable. The shock absorber is calculated according to the technical designations of the customer and can be used then only for this application.

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Features Applications: - Automated warehouses, Stacker cranes, Cranes



Packaging: - Wooden boxes; depending on national regulations according to ISPM 15

Deceleration characteristics: - Customer special

RoHS-conform: - Directive 2002/95/EC

Coating: - Standard: Housing zinc plated - Outdoor: Housing and seal bushing painted conforming to DIN ISO 12944-C5L Piston rod: nickel (30 µm) and harchrome (20 µm) plated

Extended Life Cycle: - Piston rod: hard chrome-plated - Seal bushing from high strength aluminium - Special Seals + Oils Temperature: Standard: -20°C -...+80°C Low-temperature: -40°C-...+60°C High-temperature: 0°C-...+100°C

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Accessories Stop Cap D 80

LDS 75

F 25

ø E1 66

Proximity Switch Order no. N U max = 10 ... 30V DC I max = 200mA Sn = dependent on a magnetic field

PNP M

BK

short-circuit protection reverse polarity protection

BN

BU

L+ A L-

NO

Protection Bellow LDS 75 Stroke

A

mm

mm

50

390

75

436

100

490

125

540

150

612

200

690

250

790

ØG

70 mm

300

945

ØF

130 mm

350

1095

400

1196

450

1297

500

1398

600

1599

700

1866

800

2067

900

2316

1000

2516

LDS 75

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Accessories Return Spring

Enlarged Stop Cap

Metal Wiper

øD

L

LDS 75

L 32

øD 80

Application: Shock absorber against Shock absorber

LDS 75

øD 106

(Stroke: -10 mm)

Security Chain

For safety reasons we recommend the use of a security chain when the installation height of the LDS / HLS heavy-duty shock absorber is 2 m or above.

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Accessories Clevis Mounting

DIMENSIONS Stroke

A

F

G

H

J

øK

L

M

P

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

LDS-75-050

50

432

90

38

32

60

25

45

38

60

LDS-75-075

75

483

90

38

32

60

25

45

38

60

LDS-75-100

100

520

90

38

32

60

25

45

38

60

LDS-75-125

125

585

90

38

32

60

25

45

38

60

LDS-75-150

150

642

90

38

32

60

25

45

38

60

LDS-75-200

200

736

90

38

32

60

25

45

38

60

LDS-75-250

250

838

90

38

32

60

25

45

38

60

LDS-75-300

300

940

90

38

32

60

25

45

38

60

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Instructions for use and assembly LDS LDS series shock absorbers are delivered ready for installation. After receiving the shock absorbers, check for transport damage. This applies particularly for damage to the chrome finish on the piston rod. Before using, ensure that the part number in the order confirmation and on the shipping documents coincides with the number on the shock absorber. Use the shock absorbers only as specified in the technical data, based on the design. Always observe the following installation instructions: Ensure that shock absorbers are installed rigidly and vibration-free. Ensure that the stop surfaces are perpendicular to the stop cap and mounting flange Ensure that the mass is applied parallel to the damping direction and in the center of the stop cap/piston rod (see angle deviation in our catalog) The mounting bolts should not be more than 2 mm smaller than the intended mounting holes. Ensure that the shock absorbers are never subjected to direct or indirect distortion, because this would prevent the piston rod from moving. Protect the piston rod against damage From 800 mm stroke the shock absorber has to be mounted with foot mounting or with flanges at each side We recommend to use a front flang mounting from 300 mm stroke. For the LDS series is recommended for an easy maintaince to mount the damper so that the filling valve is at the top. Heavy duty shock absorbers versions “FVFH” (2 flanges) and “FB” (foot mounting): In these versions, the rear flange and the rear foot mounting are not glued in (status: 10.06.2009). The shock absorber must be mounted free of tension. This is possible by twisting the rear flange if necessary. Control: the shock absorber can be removed without tools after loosening the fastening screws. For safety reasons we recommend the use of a security chain when the installation height of the LDS heavy-duty shock absorber is 2 m or above. The customer decides on the use. In creep gear (maximum shock absorber compression rate 0.5 m/s) the shock absorber should not be compressed more than 70% of its maximum stroke. Operating temperature (standard version): -20° C to max. +80° C; Continuous operation (standard version): -10° C to max. +70° C;

Operating temperature (HT version): –5° C bis + 120° C; Continuous operation (HT version): -5°C - +110° C Operating temperature (LT version): -32° C to max. +50° C Continuous operation (LT version): -32° C to max. +50° C Operating temperature (LT version): –50° C bis max. + 50° C; Continuous operation (LT version): –50° C bis max. + 50° C; When used at low temperatures LT and LTT execution we recommend stationary installation; mobile mounting can result in leakage of the shock absorbers due to transfer of vibration! Do not weld shock absorbers or subject to aggressive liquids. If shock absorbers are painted, ensure that the piston rod and the area where the piston rod enters the housing remain paintfree. If it is not possible to maintain the above conditions, obtain written approval from Weforma Dämpfungstechnik GmbH before using. Standard version: with gas return If the piston rod does not extend by itself, the gas bladder can be filled through the pressure valve similar to a passenger car tire. Filling pressure: 6 bars/85 psi, Medium: Nitrogen, compressed air also possible. The filling valve for gas is labelled “AIR”. In the LDS series in the front flange mounting; in older versions(up to 2007) it is situated in the base of the housing. The filling screw for oil is located in the front flange mounting in the LDS. The filling screw for oil must not be opened by the customer without consulting Weforma. Before refueling the filling valve needs to point vertically upward, as it can otherwise lead to a loss of oil. After an accident be sure to check the shock absorber for proper function and leakage. Otherwise perform this test once a year. Design: Compression of piston rod in creep gear; after the load is relieved the piston rod should return to the original position. Caution: The shock absorber is charged with gas at a pressure of 6 bars and should never be opened by customers. Risk of injury! Version with return spring The return of the piston is effected by the return spring. The current versions of our operating and installation instructions apply. These can be downloaded under www.weforma. com menu point Login/Service. We reserve the right to make changes without further notice!

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Important information Attention!

Before Installation, commissioning, servicing and repair the date sheet is to be noticed. Realisation of the works only by trained, introduced specialist staff. Electric connections according to the suitable national regulation. for Germany: VDE regulation VD E0100 Before all repair, and servicing works the energy supplies (main switch, etc.) are to be switched off! Moreover, measures are necessary, around unintentional Reconnect to prevent, e.g., in the main switch a suitable warning „servicing works“, „repair works“ etc. attach.

Designated use

Check before installation and use whether the type name on the damper or on the packaging with the suitable name on the delivery note agrees Industrial shock absorbers are maintenance-free and ready with installation • • • • • • • •

Moved masses Can start with the installation of the shock absorbers by unintentional for injuries and body damages lead. Moved masses against unintentional procedure protect. The dampers can be inexpedient for the application and show no sufficient damping effect. Before the installation check the suitable suitability of the shock absorbers At the company beyond the allowed temperature area the damper can lose his function. To temperature area absolutely keep. Shock absorbers because of the warm radiotherapy do not varnish Fluide, gases and dirty particle in the surroundings can attack the poetry system of the shock absorber or destroy and lead to the functional financial loss of the shock absorber. Piston rod and poetry system against outside funds in the surroundings protect or isolate. Damages of the piston rod surface can destroy the Poetry system. Piston rod are not greasy, oil etc. and before dirty particles protect. the piston rod can be torn out from the damper. The piston rod do not load on train tension Shock absorber can break off in demand. The connection construction always lay out in such a way that the at most appearing forces with sufficient security can be recorded. The maximum supporting forces performed in the calculation programme can deviate from the later really appearing supporting forces, because these are based on theoretical values. A setting of the shock absorbers to the respective application is necessary compelling. A wrong setting of the damping leads to a raised machine charge and to an untimely financial loss of the shock absorber

Liability

Due to the number of possible uses of our products and the conditions of use that lie outside of our scope of influence, we accept no liability as to whether the purchase object is suitable for the Client‘s intended purpose. The verification to this effect, in particular the verification as to whether the purchase object is suitable for the planned use, is the responsibility of the Client alone, unless expressly agreed otherwise in writing. For the reasons we accept no liability for the suitability of the purchase object for the purpose intended by the Client, except in cases of intent or gross negligence. With damages, the not designated use and from high-handed, in these instructions do not originate to intended interventions, any guarantee and liability claim goes out towards the manufacturer.

Guarantee

By non-use of the original spare parts the guarantee claim goes out.

Environment protection

By the exchange from damaged parts is to be respected to a proper disposal.

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