SU934297A1 - Motor saw testing stand - Google Patents

Description

(54) MOTOPIL TEST BENCH

one

The invention relates to vibration testing means and can be used in the forest and woodworking industry.

A stand for testing motor saws is known, which includes a fixed base and a load device 1.

However, this stand does not allow simulating the dynamic properties of wood and therefore the level of vibration on the handles and the motor differs significantly from the real one.

A stand for testing motor saws is known, comprising a stationary base, a load device, mounting elements for the guide tire of the saw apparatus, made in the form of two L-shaped plates arranged symmetrically with respect to the tire, pressure elements, and elastic-damping elements 2.

In such a stand, a spatial vibration floor is created on stationary operating conditions of the power saw, however, in the case of transient conditions, the test results of the power saws differ from operational ones.

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

The goal is achieved by the fact that the stand is equipped with levers installed symmetrically with respect to the saw bar, some ends of which have curved surfaces for interacting with gland elements, while others are connected by means of driving them, which is made electromagnetic.

FIG. 1 shows a stand, side view;

10 in FIG. 2 - the same, top view.

Claims (2)

The bench contains a stationary base 1, a load device 2 in the form of a DC generator, an element 3 and 4 for fastening the guide rail of the 5-saw apparatus, clamping elements 6–9, elastically damping elements 10, connecting elements 3 and 4 with clamping elements 6- 9. The levers 11 and 12 are located in the HOU plane symmetrically to the HOU plane 5. The ends of the levers 11 and 12, which interact with the clamping elements 8 and 9, are made with a curvilinear surface, and their axes 13 and 14 are rigidly connected to the housing 15. Other ends The levers 11 and 12 are connected by means of their rotational drive, made in the form of an electromagnet, the core 16 and the body 17 of which are connected pivotally through the axes 18 and 19 with the levers 11 and 12. The electromagnet is equipped with a software device (not shown). The fastening elements 3 and 4 of the guide bus 5 are made in the form of two L-shaped pressure plates arranged symmetrically with respect to the guide 5. The pressing elements b-9 are located in mutually perpendicular planes relative to the plane 7 of the CV 5. Fixed position of the levers 11 and 12 are made by guide pins 20 and 21, which simultaneously serve to guide the gland elements 8 and 9. The amount of movement of the levers 11 and 12 is limited and adjusted by stops 22 and 23. The saw 24 is fixed by the handle dipper in the attachment member 25. The stand is operated as follows. The control winding of the electromagnet de-energizes. The gland elements 8 and 9 under the action of the elastic forces of the elements 10 push apart. The guide tire 5 is installed between the L-shaped elements 3 and 4. When the chain saw is operating, the payload of the engine from the drive sprocket shaft is perceived by the load device 2. Vibrations from the engine are transmitted through the elastic-damping elements 10 and the attachment elements 25 to the fixed base I. through the axes 18 and 19 on the levers And and 12, which, turning around the axes 13 and 14, act with curvilinear surfaces on the gland elements 8 and 9, changing the dynamic parameters of wood according to ////////, / back Nome law. This law is defined by the profile of the curved surface and the corresponding program that controls the current intensity of the electromagnet. The presence of guide shafts 20 and 21 and stops 22 and 23 limits the movement of the levers in the direction of the axes OX and OZ. The arising specific frequency-dependent forces create on the stand the spatial vibration field of the nodes of the saws on the transient conditions corresponding to the actual conditions of operation of the saw. Claims. Test bench for motor saws containing a fixed base, a load device, mounting elements for the guide tire of the saw apparatus, made symmetrically arranged relative to the guide tire of the pressure L-shaped plates, clamping and elastically damping elements, characterized in that, in order to approximate conditions tests to operational ones, it is equipped with levers installed symmetrically with respect to the saw bar, one ends of which have curved surfaces for interacting with gland ementami, while others are connected through their rotation drive. 2. The stand according to claim 1, characterized in that the drive for turning the levers is electromagnetic. Sources of information. , taken into account during the examination 1. Polishchuk A.P. Wood logging tools. M., 1970, p. 90-100. 2. USSR author's certificate No. 688853, cl. G 01 M 19/00, 1976 (prototype).