Viscometer with rotor detection
A viscometer arrangement includes a detection system for detecting the proper placement of a rotor. An optical detection system may be used to detect the presence of an obstruction between the upper and lower dies while the upper and lower dies are in an open position.
1. A viscometer for measuring properties of a sample material, comprising:
a rotor including a rotor head and a rotor stem;
a motor and a drive shaft coupled to the motor, the rotor being removably couplable to the drive shaft;
an upper platen, an upper die, a lower platen and a lower die, the upper and lower dies having an open position to receive a sample therebetween and a closed position to define a sealed test chamber that encloses the rotor head and the sample, the upper and lower dies being separated by a space when in the open position;
a crosshead coupled to the upper platen, the crosshead adapted to move the upper platen and the upper die relative to the lower platen and lower die;
a controller;
a transmitter being positioned to transmit an energy transmission over the lower die and across the space when the upper and lower dies are in the open position; and
a receiver adapted to receive the energy transmission and to output a signal to the controller when the energy transmission is received by the receiver,
the controller being configured to control closure of the upper and lower dies in response to receipt of the signal from the receiver.
2. The viscometer of claim 1 , wherein the energy transmission includes a light beam.
3. The viscometer of claim 1 , wherein the controller permits closure of the upper and lower dies in response to receipt of the signal from the receiver.
4. The viscometer of claim 1 , wherein the controller prohibits closure of the upper and lower dies in response to receipt of the signal from the receiver.
5. The viscometer of claim 1 , wherein the controller outputs an alert when the signal is received.
6. The viscometer of claim 1 , wherein the controller outputs an alert in response to non-receipt of the signal from the receiver.
7. The viscometer of claim 1 , wherein there is an absence of a locking arrangement between the rotor and the drive shaft.
8. The viscometer of claim 1 , wherein the viscometer comprises a Mooney viscometer.
9. The viscometer of claim 1 , further comprising a reflector that is positioned to reflect the energy transmission from the transmitter to the receiver.
10. The viscometer of claim 1 , wherein the energy transmission includes infrared light.
11. A method of detecting proper rotor alignment in a viscometer, comprising acts of:
(a) providing a rotor that is removably couplable to a drive shaft that drives the rotor, the rotor including a rotor head;
(b) providing an upper platen, an upper die, a lower platen and a lower die, the upper and lower dies having an open position to receive a sample therebetween and a closed position to define a sealed test chamber that encloses the rotor head and the sample, the upper and lower dies being separated by a space when in the open position;
(c) transmitting an energy transmission over the lower die and across the space when the upper and lower dies are in the open position;
(d) sending a signal to a controller when the energy transmission is received by a receiver; and
(e) controlling closure of the upper and lower dies in response to the controller receiving the signal from the receiver.
12. The method of claim 11 , wherein act (e) includes prohibiting closure of the upper and lower dies in response to receipt of the signal from the receiver.
13. The method of claim 11 , wherein act (e) includes permitting closure of the upper and lower dies in response to receipt of the signal from the receiver.
14. The method of claim 11 , wherein act (c) includes transmitting a light beam.
15. The method of claim 11 , wherein act (c) includes transmitting infrared light.
16. The method of claim 11 , further comprising:
(f) reflecting the energy transmission from a transmitter to the receiver.
17. The method of claim 11 , wherein the act (c) includes hitting an obstruction with the energy transmission.
18. The method of claim 17 , wherein the obstruction blocks at least a portion of the energy transmission from reaching the receiver.
19. The method of claim 18 , wherein act (e) includes prohibiting closure of the upper and lower dies.
20. The method of claim 11 , wherein the viscometer comprises a Mooney viscometer.