Turntable’s parts mainly include rotary device body, cast base, input shaft assembly, locking device, main bushing device, and upper cover, etc.
The rotary table is a cast steel piece, drilling tool and casing string can pass it through the hole in its center. To rotate the drill string, there are 2 grooves on the upper rotary table, and the 2 pin on upper main bushing device are seated in these two grooves.
The base of rotary table device is on the primary and secondary combination bearings, which is supported on the bottom base through the off circle of bearings. The upper section of off circle of combination bearings acts as the primary bearing, which bears all load from drill column and casing string. The lower section of off circle acts as the secondary bearing, which is mounted on lower drilling platform via lower base circle to support the jumping-up from shaft bottom.
The rotary table rotates using a pair of bevel gear pair. The Big teeth circle is installed on rotary table.
The small bevel gear is fitted on one side of shaft which is in turn supported on the two bearings seated in the bearing pedestals. A flange and double row sprocket are fitted on the other side, making up an input shaft assembly.
A locking device which brake the rotary table to rotate towards the left and right is installed on the top of turntable. One of the left and right ratchet pawls is fed into one of the 28 slot positions of rotary table by the joystick when the rotary table is braked.
Main bushing device consists of two sections, the upper section includes two outshots seated in the grooves of rotary table.
The big and small gears are all made from alloy steel.
The main bushing as a whole is steel casting.
The turntable is lubricated fully, and sealed safely.
|
Item
|
Model
|
|
ZP175
|
ZP205
|
ZP275
|
ZP375
|
ZP495
|
|
Bore diameter (mm)
|
444.5
|
520
|
698.5
|
952.5
|
1257.3
|
|
Max. static load (kN)
|
1350
|
3150
|
4500
|
5850
|
7250
|
|
Max. working torque (Nm)
|
14000
|
23000
|
28000
|
33000
|
37000
|
|
Max. speed (r/min)
|
300
|
300
|
300
|
300
|
300
|
|
Gear ratio
|
3.58
|
3.22
|
3.67
|
3.56
|
3.93
|
|
The distance from RT
centerline to the center line
of sprocket inside teeth (mm)
|
1118
|
1353
|
1353
|
1353
|
1651
|
|
Overall size
|
L (mm)
|
1935
|
2292
|
2392
|
2468
|
2940
|
|
W (mm)
|
1280
|
1475
|
1670
|
1810
|
2184
|
|
H (mm)
|
585
|
668
|
685
|
718
|
813
|
|
Weight (kg)
|
3888
|
5530
|
6163
|
7548
|
11626
|
