Hydraulic Overload Protection System
Specification
Releasing Flow Rate
|
Ratio of Overload Pressure |
Under 200 tons |
200-600 tons |
Over 600 tons |
||
|---|---|---|---|---|---|
|
Small type |
Standard type |
Large Flow type |
Standard type |
||
|
V口06 |
V口08 |
VS10 |
V口12 |
VA20 |
|
|
40 Ratio |
----- |
----- |
----- |
----- |
96000 |
|
50 Ratio |
15500 |
15500 |
----- |
39000 |
84000 |
|
70 Ratio |
13000 |
13000 |
18000 |
31000 |
70000 |
|
90 Ratio |
11500 |
11500 |
14500 |
27000 |
60000 |
Type of Limit Switch
|
During the Production |
When Overload Happening |
After Overload |
|
|
2 : NO type |
OFF |
ON |
ON |
|
6 : NC type |
ON |
OFF |
OFF |
Installation Mode
CIRCUIT CONTROL SYSTEM
VA type
VS type
〈 Selection Basis 〉
Specification & Parameter of Press
F: Press Rated Capacity (tons)
S: Stroke Length (mm)
N: Stroke per Minute (SPM)
H: Rated Tonnage Point (mm)
D: Cylinder Diameter (cm)
n: Cylinder Number (pc)
h: Cylinder Stroke (cm)
Calculation Formulas for Model Selection
|
A |
= |
(πD²/4) x n (cm²) |
Cylinder Area |
|
P |
= |
F x 110% x 1000/A (kgf/cm²) |
Hydraulic Pressure Setting of Overload (VS model) |
|
Pa |
= |
P/m (kgf/cm²) |
Air Pressure Setting Of Overload (VA model) |
|
V |
= |
N√SH-H² /87.5 (cm/sec) |
Drop Speed Of Slide |
|
Q |
= |
A x V (cm³/sec) |
Releasing Flow Rate |
|
L |
≥ |
4 x A x h(cm³) |
Volume of Oil Tank |
* m: Ratio of overload hydraulic pressure
* Releasing flow rate (Q) of overload protector, which you choose has to be more than of cylinder volume. If releasing flow rate isn't enough, please use two sets of overload protector.
Example (model: VA(VS)08-7口口 )
|
F |
= |
160 tons |
A |
= |
(π26²/4) x 1 = 531 (cm²) |
|
|
S |
= |
200 mm |
P |
= |
160 x 110% x 1000/531≒332(kgf/cm²)----VS model |
|
|
N |
= |
40 SPM |
Pa |
= |
332/70≒ 4.75 (kgf/cm²)----VA model |
|
|
H |
= |
6 mm |
V |
= |
40200×6-62 |
|
|
D |
= |
26 cm |
Q |
= |
531 x 15.6= 8284 (cm³/sec) |
|
|
n |
= |
1 pc |
L |
≧ |
4 x 531 x 1 ≧ 2120(cm³) |
|
|
h |
= |
1 cm |
/87.5=15.6 (cm/sec)
Note
1. Hydraulic pressure (P) and air pressure (Pa) of overload protector, should be choose as higher as possible.
(Example: P=335 kgf/cm² or Pa=4.8 kgf/cm²)
2. Hydraulic Piping Size:
|
VA (VS)08 – ☐ ☐ ☐ – ☐ ☐ ☐ |
VA (VS)12 – ☐ ☐ ☐ – ☐ ☐ ☐ |
||
|
Size (I.D/O.D) |
Work Pressure (maxi.) |
Size (I.D/O.D) |
Work Pressure (maxi.) |
|
12/18 mm |
400 kgf/cm² |
14/22 mm |
400 kgf/cm² |
|
13/18 mm |
320 kgf/cm² |
16/12 mm |
300 kgf/cm² |
|
14/18 mm |
250 kgf/cm² |
18/22 mm |
200 kgf/cm² |
3. Inside diameter of air piping must be more than 6 mm
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