Control device for cover of electric induction furnace

[0025] Specific implementation method

[0026] The embodiments shown in the accompanying drawings are as follows: a pneumatic control device for the furnace cover of an induction electric furnace.

[0027] like figure 1 , figure 2 Shown: frame 20 is installed on one side of body of heater 19. Vertical shaft 15 is housed in framework 20 middle parts. A sleeve 14 is sheathed on the outside of the vertical shaft 15 . A bearing 16 is installed between the vertical shaft 15 and the sleeve 14 , and the sleeve 14 can rotate around the vertical shaft 15 through the bearing 16 . A connecting rod I13 is welded on the upper end of the sleeve 14, and the upper part of the connecting rod I13 is movably connected with the connecting rod 12 through a pin shaft I12. One end of the connecting rod 12 is an inclined oblique rod 17, and the end of the inclined oblique rod 17 is fixedly connected with the large furnace cover 18. The other end of the connecting rod 12 is a transverse connecting rod 8 . The lower end of the lifting cylinder 2 is fixedly connected with the sleeve 14, and the lifting cylinder 2 can rotate with the rotation of the sleeve 14. The upper part of the lifting cylinder piston rod 5 of the lifting cylinder 2 is movably connected with the connecting rod II10 through the pin shaft II9. The upper end of the connecting rod II10 is fixedly connected with the end of the horizontal connecting rod 8 . The connecting rod III3 is fixedly connected to the body of the lifting cylinder 2, the limit contact block I4 of the limit switch X2 at the end of the connecting rod III3, the connecting rod IV7 is fixed at the end of the horizontal connecting rod 8, and the limit switch is fixed at the end of the connecting rod IV7 Limit contact block Ⅱ6 of X2. There is a gap between the limit contact block I4 and the limit contact block II6. When the piston rod of the lifting cylinder is fully retracted, the limit contact block I4 and the limit contact block II6 touch each other to make the limit switch X2 conduct. The limit contact block I4 and the limit contact block II6 are electrically connected to the L contact and the coil of the contactor IV through wires respectively.

[0028]Rotary cylinder 1 is also housed on the frame 20 . The end of the rotary cylinder piston rod 26 of the rotary cylinder 1 is movably connected with the connecting rod V23 through the pin shaft III25, and the other end of the connecting rod V23 is connected with the outer ring of the sleeve 14 through the rubber chain I22. Connecting rod Ⅵ29 is fixedly connected to the body of rotary cylinder 1, the limit contact block Ⅲ28 of the limit switch X1 at the end of the connecting rod Ⅵ29, the sleeve 14 is connected with the connecting rod Ⅶ24 through the rubber chain Ⅱ21, and the limit switch at the end of the connecting rod Ⅶ24 The limit contact block of X1 Ⅳ27. There is a gap between the limit contact block III28 and the limit contact block IV27. When the rotary cylinder piston rod 26 is fully stretched out, the limit contact block III28 and the limit contact block IV27 touch each other to make the limit switch X1 conduction. The limit contact block III 28 and the limit contact block IV 27 are electrically connected to the L contact and the coil of the contactor III through wires respectively.

[0029] like image 3 As shown: the high-pressure air pump 30 is respectively connected to two electromagnetic reversing valves DTⅠ31 and DTII34 controlled by two electromagnets through pipelines. Electromagnetic reversing valve DTⅠ31 is connected with the air chamber 33 before the lifting cylinder of the lifting cylinder 2 and the rear air chamber 32 of the lifting cylinder of the lifting cylinder 2 through two pipelines respectively. Electromagnetic reversing valve DTII34 communicates with the front air chamber 36 of the rotary cylinder 1 and the rear air chamber 35 of the rotary cylinder 1 through two pipelines respectively.

[0030] like Figure 4 The circuit diagram shown is as follows, the L contact and the N contact are respectively connected to the live wire and the neutral wire of the 220V AC power supply. The L contact point and the N contact point are electrically connected to the loop one 37 , the loop two 38 , the loop three 39 , the loop four 40 , the loop five 41 and the loop six 42 respectively.

[0031] The L contact is electrically connected with the furnace cover button A1 of the loop one 37. The other end of the cover button A1 is electrically connected with the coil of the contactor J2. The normally open contact J1-1 of the contactor J1 and the normally closed contact J2-1 of the contactor J2 connected in series are connected in parallel at both ends of the furnace cover button A1. The other end of the coil of the contactor J1 is electrically connected to the N contact.

[0032] The L contact is electrically connected with the furnace lid opening button A2 of the loop two 38. The other end of the button A2 for opening the furnace lid is electrically connected with the coil of the contactor J2. The two ends of the furnace lid opening button A2 are connected in parallel with the normally open contact J2-2 of the contactor J2 and the normally closed contact J1-2 of the contactor J1 which are connected in series. The other end of the coil of the contactor J2 is electrically connected to the N contact.

[0033] The L contact is electrically connected to the limit contact X1 of the circuit three 39 . The other end of the limit contact X1 is electrically connected to the coil of the contactor J3. The other end of the coil of the contactor J3 is electrically connected to the N contact.

[0034] The L contact is electrically connected to the limit contact X2 of the circuit four 40 . The limit contact X2 is electrically connected with the coil of the contactor J4. The other end of the coil of the contactor J4 is electrically connected to the N contact.

[0035] The L contact is electrically connected to the normally open contact J3-1 of the contactor J3 of the circuit 5 41 . The other end of the normally open contact J3-1 of the contactor J3 is electrically connected to the normally closed contact J2-3 of the contactor J2. The other end of the normally closed contact J2-3 of the contactor J2 is electrically connected to the electromagnetic reversing valve DTI, and the other end of the electromagnetic reversing valve DTI is electrically connected to the N contact.

[0036] The L contact is electrically connected to the normally open contact J1-3 of the contactor J1 of the circuit 6 42 . Both ends of the normally open contact J1-3 of the contactor J1 are connected in parallel with the normally closed contact J4-1 of the contactor J4. The other end of the normally open contact J1-3 of the contactor J1 is electrically connected to the electromagnetic reversing valve DTII. The other end of the electromagnetic reversing valve DTII is electrically connected to the N contact.