SU1486479A2 - Device for simulating cutting forces in wood-working machines - Google Patents

Description

The invention relates to wood industry. purpose

inventions - improving the accuracy of testing. An additional insert 10 is introduced into the device in the form of a disk with a crown of blades 12, which has the ability to rotate around a vertical

2

anchor axes. The device contains a bracket 1, nozzles 2 and 3 with a pneumatic hose, an anchor 9 and an insert 10 mounted on it on spindle 8. At the same time, the anchor 9 and the insert 10 have rims of blades 11 and 12. The number of blades is the same, and their central angles are equal. When opening the valve 7, the compressed air from the nozzle 3 enters the anchor 9. As a result, a constant force proportional to the pressure and air flow through the nozzle 3 is applied to the rotating spindle 8.

When opening the valve 6, the compressed air from the nozzle 2 enters the rims of the blades 11 and 1 2 of the armature 9 and the liner 10, rotating with the spindle, loading them with force impulses, the amplitude of which is also proportional to pressure and air flow.

2 Il.

1486479 A2

3

1486479

The invention relates to the woodworking industry, in particular to the technique of testing various designs and devices, can be used as a load-simulating device for testing wood cutting machines (milling, quadrilateral, circular saw) at machine-tool plants; in laboratories, etc., including on reliability and durability, and is an improvement of the invention according to ed. Sr.No. 1272144

The purpose of the invention is to improve the accuracy of the test by adjusting the pulse duration.

FIG. 1 shows a schematic side view of the device; Fig.2to same, top view.

The device 'is mounted on the table of the test machine and contains a bracket 1, on which nozzles 2 and 3 are mounted, which are connected to the pneumatic tubes 4 and 5 connected through the valves 6 and 7 to the air line. On the machine spindle 8, an anchor 9 is fastened with an insert 10 inserted into it, and an anchor 9 is provided with a crown of blades 11, and a crown of blades 12 on the anchor. Between the anchor 9 and the liner 1 0 on the spindle 8 are cup springs 13. The anchor and liner are mounted on the spindle with a nut 1 4.

Nozzles 2 and 3 have the ability to adjust the gaps and with screws 15 in the direction of the arrow. Outside, the device is closed with a sound-absorbing casing (not shown).

The device works as follows.

When the crane 7 is opened, compressed air from the air line through the pneumatic hose 5 enters the nozzle 3, and from it the cylindrical part of the armature 9, resulting in a constant (static) force proportional to the rotating spindle 8 of the machine through the anchor. pressure and flow of air through the nozzle 3, as well as the size of the gap with? between nozzle 3 and anchor 9.

When opening the valve 6, the air through the pneumatic hose 4 and the nozzle 2 enters the rims of the blades 11 and 12 of the armature 9 and the liner 10, rotating with the spindle 8, loading them with force impulses, the amplitude of which is also proportional to the pressure and flow rate of air, as well as the size of the gap 8 . The magnitude of the gaps with £, and (Λ, is regulated by screws 15.

The frequency £ of the simulated effort is given by

_{£ =} ^, GN,

where w - the number of blades of the crown;

η is the spindle speed,

min ' ¹ .

The duty ratio of the impulses of force is determined by the ratio of the total (effective) arc length of two adjacent blades II and I 2 and the inter-blade depressions. Regulation of the duty cycle is as follows: when loosening the nut 14, the insert I 0 is squeezed out by disc springs I 3 of the armature 9, manually the anchor 9 and the liner unfold around the vertical axis, and the blades II and 12 can be a total (effective) arc in the range from about (to

= 2o /, which allows you to set the angle of contact of the cutter with wood corresponding to the test mode.

After installing the required arc, the anchor 9 and liner I0 are fixed on the spindle with an I4 nut.

The combination of different in magnitude forces, as well as the frequency and duty cycle of force pulses, makes it possible to simulate almost all types and ratios of forces that arise when milling and sawing wood, expanding the technological capabilities of the device.

Claims (1)

Claim A device for simulating cutting forces on woodworking machines according to ed. St. No. 1272144, which is based on the fact that, in order to increase the accuracy of the tests by adjusting the pulse duration, an insert in the form of a disk with blades fixed on its end surface is mounted on the spindle in the armature cavity the number of blades of the anchor, and the central angles of each of the blades of the anchor and liner are equal. 1486479 11 12 —7 four four- Phie2