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  • Address: No.27,Beichen Village Industrial Park,Weiyang District,Shaanxi Province

  • Phone: +86 13279217918

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Stressing Jacks

Feature of automatic stressing jack:
1.more compact structure
2.good sealing performance
3.light weight
4.small volume
5. convenient installation and dismantlement.

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  • Product Details

Application:  

bridges, high buildings, coal  mine , railway and subway,  water conservancy and hydropower engineering .

Working principle:

The oil cylinder ,heading cover(adjusting nut) ,end cover(hold-down ring), front sealing plate,back sealing plate of this jack connect with cross-core socket to form a “motionless body”, and the piston of the jack is “motion body”, when the hydraulic oil pushes the “motion body” to the right, it begins to tension; When the hydraulic oil pushes the motion body to the left, it is the piston-return after the tension.

Use hydraulic oil for 65°C,kinematic viscosity for 15~ 50 mm2/s,the diameter of the impurity is not more than 137 μ m and high quality mineral oil with a certain rust resistance, recommend 32 # hydraulic oil in winter, 46 # hydraulic oil in summer, when it is used in special environment, please consider to use other types of oil .

Specification:

Model

Nominal Tensio(KN)

Nominal Pressure(KN)

Tension Piston Area

Return Piston Area

Return Pressure

Center Hole Dia.

Tension Stroke

(mm)

Weight

(kg)

Dimension

(mm)

Setcrew Open End Dia.

Open End Dia.

ZTW60

600

52

1.15*10-2

0.41*10-2

≤25

∅60

200

33

∅170*325

∅102

∅90

ZTW100

992

52

1.91*10-2

0.78*10-2

≤25

∅78

200

65

∅216*330

∅149

∅130

ZTW120

1202

48

2.505*10-2

1.103*10-2

≤25

∅78

200

80

∅238*330

∅149

∅130

ZTW150

1511

50

3.02*10-2

1.6*10-2

≤25

∅102

200

106

∅280*360

∅170

∅156

ZTW200

1960

52

3.77*10-2

1.84*10-2

≤25

∅120

200

135

∅310*360

∅196

∅176

ZTW250

2480

54

4.59*10-2

2.80*10-2

≤25

∅140

200

162

∅350*369

∅210

∅186

ZTW300

3000

52

5.773*10-2

3.13*10-2

≤25

∅146

200

217

∅380*372

∅230

∅216

ZTW350

3497

54

6.48*10-2

3.46*10-2

≤25

∅175

200

268

∅413*380

∅252

∅252

ZTW400

3955

52

7.61*10-2

4.46*10-2

≤25

∅175

200

278

∅440*380

∅252

∅252

ZTW450

4400

59

7.61*10-2

4.46*10-2

≤25

∅175

200

278

∅440*380

∅252

∅252

ZTW500

4924

49

10.05*10-2

4.77*10-2

≤25

∅196

200

385

∅500*390

∅302

∅302

ZTW600

6050

50

12.1*10-2

5.82*10-2

≤25

∅196

200

590

∅530*405

∅302

∅302

ZTW650

6500

50

13.13*10-2

6.29*10-2

≤25

∅617

200

617

∅575*465

∅362

∅362

Structure:

stressing jack-05

Preparation for the procedure:

1. In order to ensure the accuracy of the tension, the jack should be matched with the oil pump, pressure gauge and external high-pressure hose to carry out the calibration of “oil pressure value-output force”. The calibration is based on the working state of the jack, and the classification is recorded. The average value of the three measurements is taken and the chart is used as the basis for the tension.

2. Re-calibrate the jacks under the following circumstances:

(1) After the jack has been dismantled and repaired;

(2) The pressure gauge has collided or failed;

(3) When replacing a new pressure gauge;

(4) The jack is reused after a long time.

 3. The jack should be made of No. 46 high quality hydraulic oil. The oil is free of water, acid and other mixtures. The oil should be kept strictly clean, often filtered and replaced regularly. 

 4. When installing the oil pipe, the interface part should be cleaned and clean. Strictly prevent sand and dust from entering the jack and disassemble it as much as possible. When using the new tubing, do not connect it directly to the jack nozzle. It should be cleaned beforehand or washed in the oil output from the pump before use. After the oil pipe is removed, the jack and the oil pump are stressed and dustproof to prevent dirt from entering. 5. Before using the jack, it is better to run the air for more than three times to use the air inside the cylinder. 6. The jack should be cleaned regularly according to the actual use. If the work finds faults, oil leakage, surface scratches, etc., it should be stopped.

 7. When the jack is in operation, the operator should stand on both sides, and it is strictly forbidden to stand in the direction of the end face to avoid accidents.

 8. The exposed work surface of the jack should be kept clean and should be returned to the end after the work is completed. When it is idle, it should be covered with dust and placed indoors.


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