SU1278653A1 - Propeller device test stand - Google Patents

Abstract

The invention relates to bench equipment intended for accelerated testing of assemblies and mechanisms, in particular for testing roller propellers for pulling mechanism of stem-cutting machines. The purpose of the invention is to approximate test conditions to operational ones. The stand consists of the base 1, on which the guides 2 are mounted, the U-shaped frame 3 (L N0 sk o SP 00

Description

and pillars 4. A loading device, made in the form of a lever 7 and a hydraulic cylinder 13, and a simulator of a feed element of a roller drive, made in the form of a sector of roller 9 connected to a strain gauge element (heavy) 11, are installed on the U-shaped frame. .2

278653

A movable support table 14 is installed on which the wood sample is placed. When the sector of the roller 9 is rotated, the sample is moved, and the force of the pressing of the roller and the force of its movement are measured by means of the corresponding. strain gauge elements. 3 il.

The invention relates to bench equipment intended for accelerated testing of self-propelled machines, assemblies and mechanisms, in particular for testing roller propellers of the pulling mechanism of barreling machines.

The purpose of the invention is to approximate test conditions to operational ones.

Fig. I shows the proposed stand, a general view; figure 2 is the same, view a in figure 1; on fig.Z - the same, type B in figure 1,

The stand consists of a base I of the construction with polished guides 2, a vertically arranged U-shaped frame 3 and a stand 4 on which the lever of the loading device 6 is installed by means of the hinge 5, which can be rotated relative to the hinge 5 in the vertical plane. In order to eliminate the occurrence of torque when braking the sample during the feeding process, the hinge 5 has the ability to be mounted in a vertical plane at different heights in the grooves made on the rack 4 depending on the sample diameter. On the arm 7 of the loading device, the feed element simulator is installed roller drive, made in the form of a roller sector 9, which is equipped with interchangeable engagement elements and a mechanism for its rotation in the form of a two-arm lever 10, mounted coaxially with the axis Ktorov and bonded thereto by means of strain gauge rod 11, the other end of the lever 10 is connected with hydraulic cylinder 12 rotating drum sector.

The loading device is connected to the frame cross-beam by means of a hydraulic cylinder 13. On a ground guide rail 2 of the base 1, a movable support table 14 is fitted, equipped with rollers 1.5. On the axles of the rollers, load cells are glued (not shown).

L1

The stand works as follows. The wood sample is placed on the support table 14. The flow of hydraulic fluid into the piston cavity

the hydraulic cylinder 13 holds the loading device 6 with the roller sector 9 against the sample. In this case, the adjustment of the pressing force in a wide range is carried out by changing the pressure of the fluid in the hydraulic cylinder I3. The force of the pressing of the roller sector to the sample is perceived by the carriage axes and, accordingly, by the strain gauges glued onto them, the signals from the sensors are fed to the measuring equipment and recorded on the photo tape with an oscilloscope. By feeding the working fluid into the piston cavity of the hydraulic cylinder 12, the two shoulders lever 10 is rotated, which in turn, the strain gauge rod rotates the roller sector, resulting in a longitudinal movement along the guides

Claims (1)

the frame of the carriage with the sample, due to the forces of adhesion of the sector of the roller with the wood. The sample is delivered until it stops at rack 4. At the moment of braking, at the point of contact of the sector with wood, an increase in the adhesion force occurs, which is directed tangentially to the outer surface of the sector. The true magnitude of this force is perceived by a tensometric pull 11, the longitudinal axis of which is kinematically located also tangentially to the outer surface of the roller sector. The signals from the strain gage are fed to an amplifier, an oscilloscope, and are recorded on a photofactener. The limiting magnitude of the adhesion force is determined by the moment of movement of the mover relative to the sample. In order to determine the dependence of the adhesion force on the above factors, the stand is equipped with a shift set of roller sectors and sets of interchangeable teeth, which can be fixed on the cylindrical surface of each sector in special grooves and in different variations of the teeth pitch, both around the sector circumference and along its generatrix. In addition, the stand design allows the rolls and hooks of various designs and sizes to be tested. Claims for testing propulsion units, mainly for pulling 12 53 mechanisms of stem-cutting devices, containing a U-shaped frame fixed on the base, with a loading device installed on it, having an axis for mounting the tested motor, a movable support table mounted on the base for fixing and moving the elements interacting with the propulsor, and strain gauge equipment , differing in that, in order to bring the test conditions closer to the operational ones, the loading device is made in the form of a lever, one end of which is pivotally connected through racks The other is pivotally connected to the hydraulic cylinder rod, the casing of which is pivotally connected to the crossbar of the U-shaped frame and is equipped with a mechanism for turning the actuator around the axis, which is in the form of a two-armed lever mounted on the specified axis and connected at one end through a strain gauge that made in the form of gi, with a thruster, and the other through a second hydraulic cylinder with a lever loading device,