Coupling elements
Application
On machine tools with pallet changing systems, the coupling elements transfer hydraulic oil or compressed air from the machine table to the hydraulic clamping fixture.
Description
The coupling mechanism and the coupling nipple are provided with axial seals (see coupling situation) and have a very short coupling stroke.
The smooth front face of the coupling mechanism is easy to clean in case of swarf formation. The recessed sealing disk can be easily replaced with the assembly tool if it is damaged.
The built-in type is fixed with an intermediate plate and is particularly suitable for multi-couplings (see also data sheet F 9.440).
The intermediate plates (location plates or covers) must absorb the axial forces generated by the hydraulic pressure.
In case of the threaded-body type, the coupling mechanism is screwed directly into the base plate and the coupling nipple into the clamping fixture. Depending on the sealing, the coupling elements can be coupled either against pressure or only without pressure.
Coupling nipple with preloaded valve (VSV)
With double-acting cylinders, internal leakage oil from individual clamping or control elements can cause an increase in pressure in the return line when uncoupled, which can cause mal-functions or loss of clamping force. The built-in VSV limits the pressure increase to 5 bar. If the pressure is exceeded, hydraulic oil will leak, which indicates a larger internal leakage.
Type with integrated nozzle
A nozzle on the coupling mechanism generates a strong air stream to clean the smooth front face.
Important notes
The sealing surfaces on the front face of the coupling elements have to be cleaned before coupling to ensure the tightness in coupled condition. We recommend to wash the elements and finally clean them with compressed air. Protection covers should be used as far as possible.
The mounting bodies of the coupling elements must be guided in parallel 2 – 3 mm before coupling without exceeding the radial positioning tolerance.
To transmit compressed air and vacuum, use only the coupling elements for “depressurised coupling”.
Advantages
- Many installation variants
- Space-saving installation dimensions
- 4 different nominal diameters for optimum adaptation to the flow rate
- Built-in and threaded-body type of the same nominal size can be combined
- Transmission of hydraulic oil, compressed air and vacuum
- Stainless steel coupling elements
- Coupling mechanism with smooth front face reduces contamination and is easy to clean
- Axial sealing disk easily renewable
- Additional bushing simplifies the fabrication of the location hole for the coupling mechanism
- Relatively large positioning tolerances
- Threaded-body type ND 5 with integrated nozzle to clean the sealing surface
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Sealing disk ND3
as per data sheet F9.428
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Sealing disk ND8
as per data sheet F9.428
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Sealing disk ND5
as per data sheet F9.428
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Sealing disk ND12
as per data sheet F9.428
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Screw tool ND12
for coupling mechanism and nipple
as per data sheet F9.428
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Rotary indexing table - clamping fixture, hydraulically operated, with trunnion bearing and hydraulic positioning
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