SU41155A1 - Fitting to a sawing frame for feeding wood - Google Patents

Description

Research results show that the productivity of a sawing frame with continuous feed decreases due to the log sliding in the feed rollers as a result of a sharp increase in squeezing forces when the saws are in the bottom dead center. Therefore, it is advisable to design the parcel mechanism for the sawmill frame, in which the squeezing forces between the saw and the log are either absent or insignificant in size at this time. In order to accomplish this goal, it is proposed in timber frames of conventional construction (for example, the Bolinder factory) to use a device for variable tree feeding.

In FIG. 1 shows a longitudinal section of the device; FIG. 2 is a side view of the piston device; FIG. 3 is the same in the top view; FIG. 4- scan of the outer cylinder fixture; FIG. 5 - the same inner cylinder; FIG. 6 is a modified sweep of the inner cylinder; FIG. 7- velocity curves of the points of the vehicle fitting; FIG. 8 - curves of the paths of points

The washer (fig. 1) of the friction gear /, 2 of the proposed tool is mounted on a vertical shaft on

the tongue and, during operation, is held at a certain height in the usual way, for example, used in the parcel mechanism of the Bolinder frames, and shifting the puck up and down to increase or decrease the parcel is the same as in the Bolinder parcel mechanism. The vertical shaft in the proposed device is designed in the form of a hollow cylinder 3, freely rotating in the pins 9 on the inner brush. Inside the cylinder, the piston 5 moves vertically, which is rotatably connected with the rod 6 and the crank mechanism 7, 8 to the main shaft of the sawmill. The piston 5 is provided with protrusions 7 /, which move as the piston 5 moves up and down along the vertical guides on the inner surface of the cylinder 3.

Inside cylinder 3 there is a second hollow cylinder 4 with oblique at an angle to the vertical grooves along which the inclined or curved protrusions / 2 pistons 5 run. The cylinder 4 is connected with the vertical shaft Yu driving the gear through the gear system.

When Porsch 5 of the described device moves up and down when the clamp 7 is stationary, the inner cylinder 4 will have rotational motion with variable speed corresponding to the slope and outline of the projections 12 of the piston 5. When the washer 7 rotates from the friction wheel 2 at a constant speed and vertical movement piston 5, the speed of the rotational movement of the cylinder 4 will be equal to the sum of the speeds in its main rotational movement of the washer 1.

The paths traveled by a point on the circumference of the second cylinder are shown in FIG. 8, where the curve / represents the magnitudes of the path traveled by the point of the cylinder in its own rotary motion; the curve // is the path values traversed by the point of the piston 5 when rotating at a constant speed, and the curve /// are the resulting path values when the two movements of the point of cylinder 4 are added. The corresponding velocity diagrams are shown in FIG. 7, with the angles of rotation of the crank of the main shaft of the sawmill plotted on both diagrams on the x-axis.

Consider the curve /// FIG. 7 and the curve /// FIG. 8, it can be seen that on the section of changes in the angle of rotation of about 270 there is a stop of the log. From this it follows that by shifting the phases of movement of the main crank and feeding it is possible to combine the moment of stopping the supply with the moment of passing the saw frame through the bottom dead position, which will achieve the elimination of the pressing forces and the elimination of the corresponding harmful effects.

Obviously, with the change in the angular velocity of the friction washer 7, the character of the resulting dvilsepi changes, why in this case it is necessary to obtain the desired effect

Change the piston stroke accordingly.

Due to the variable speeds of movement of the log and the transmitting links in the feed mechanism, inertial forces should arise, the action of which will also be in the friction pair. Estimates of the inventor, as well as observations on the operation of the existing friction parcel mechanisms of the sawmill frames, show that the forces that can arise in the friction pair will not cause slipping and the prescribed law of motion for the elements of the parcel mechanism will be maintained. However, to improve the performance of the friction pair 7, 2 (e.g., reduce wear), it is useful to eliminate the influence of variable forces, for example, by inserting a flywheel.

The subject matter of the invention.

Adaptation to the sawing frame for wood supply, characterized in that the washer 7 of the friction gear is wedged on the cylinder 3 freely positioned in the trunks 9, provided on the inside parallel to its axis by grooves for the protrusions 77 on the piston 5, also having inclined or curvilinear protrusions 72, the corresponding slots in the walls of the second cylinder 4 placed inside the cylinder 3 and connected to the transmission shaft 10 to the feed rollers of the saw-frame, in which the device of the piston 5 is articulated, can be rotated freely , With the rod 6 associated crank mechanism with the main shaft sawmill in order to inform JO alternating rotation shaft.

Figure 1 n.f}. 2

Fig7