SU447179A1 - Bolt - Google Patents

Description

one

The invention relates to screens used primarily to separate coal and rock mass of a medium strength category into desired fractions.

There are known screens containing

the working cloth on a support in the form of shnekovy shaft and the drive with power shaft.

To increase productivity in the proposed rumble working canvas

Made in the form of cascaded sections, fitted along the edges with cylindrical rollers to drive the screw shafts, which are kinematically connected to the power shafts.

Figure 1 shows the proposed screen, two projections; in fig. 2 - the same cross section; ca fig. 3 - fastening of screw hooks to supports.

The screen has supports 1, 2, 3 connected by frame 4. A working sheet is installed on the supports, which is made in the form of sections 5.6 located in cascade relative to the frame and consists of two-thread screw shafts 7. The latter are connected

parasitic cogwheels and are installed parallel to the edge to the edge, so that they form a hexagonal closed cell with equal distances between the opposite faces. The cell size is set depending on the class of the undersize products, and its area corresponds to the area of the corner cell of standard sizes. The screening cell area can be halved by the mutual displacement of the edges of adjacent shafts, which is carried out with parasitic gears removed. The shafts 7 rotate respectively to the right and to the left of the longitudinal axis of the screen. The working blade provides hay cylindrical rollers 8, which are located along the edges of each section 5,6 and are designed to drive the screw shafts 7 and to prevent crushing of pieces of coal between the moving ribs of the protein auger shafts and non-sorted Grades.

To ensure rotation of the upper 5 and lower 6 sections with different speeds of auger shafts 7, the following drive & drive scheme is adopted. From engines Y with identical speeds rotate by means of a V-belt transmission 1O, power shafts 11. The latter are installed in two bearings fixed on the frame 4 of the roar, and kinematically connected with cylindrical rollers 8, which rotate the screw shafts 7 through the parasitic gears. Kinematically link made in the form of a chain transmission 12. By selecting a chain-transmission sprocket mounted on the power shafts 11 and the shanks of the cylindrical rolls 8, different rotation speeds can be given to the upper and lower sections of the screen, that is, egulirovat linear speed of movement nadreschet Nogo material so as to achieve the maximum coefficient otgrohachivani. In order to compensate for a certain amount of material acceleration by the augers of the shaft, the cross section of the screen is concave.

When the drive is turned on, the torque from the engines 9 is transmitted through the V-belt transmissions 1O to the power shafts 11. The latter, through the chain gear 12, rotate the cushion rolls 8, which, in turn, rotate the screw shafts 7 using parasitic gears.

affecting the material being transported. The edges of the shafts drive the material in the longitudinal direction, causing it to agitate and fall out of the fines fraction. Pad from the top of the screen to the bottom,

the layer of material is tilted, which causes additional purification of coarse material from adhering fines and reorientation of pieces of material relative to cells, thereby

the most improved screening conditions.

Prev.met from obr.e shadows

The screen contains a working canvas mounted on supports in the form of screw shafts and a drive with power shafts, characterized in that, in order to improve its performance, the working blade is made in the form of cascaded sections equipped with cylindrical rollers along the edges to drive the screw shafts, kinematically associated with power shafts.