SU666453A1 - Stand for testing hand-operated tools - Google Patents

Description

one

The invention relates to the field of testing and determining the vibration characteristics of hand-held machines, in particular pneumatic radial grinding machines.

A stand for testing manual machines is known, containing a frame with loading mechanisms of variable force and torque II installed on it.

The disadvantages of the known test bench include the lack of connection between the magnitude of the torque and the load, as well as the need to re-load the load device when the load characteristics change.

The aim of the invention is to automatically adjust the torque depending on the magnitude of the loading force.

This goal is achieved by the fact that the loading mechanism is made in the form of two swinging arms and is equipped with a control hydraulic cylinder, the rod n

the casing of which is connected with swinging arms, one of which is equipped with a hydraulic cylinder, the piston of which is rigidly connected with the specified lever, and the second lever is equipped with a torque loading mechanism, made in the form of a hydraulic brake with a disc, and inserted into the stand a support roller for supporting the tested manual machine, wherein the control hydraulic cylinder is hydraulically connected to the torque load brake mechanism.

FIG. 1 is a diagram of the stand; FIG. 2 - pneumatic tool mount and hydraulic brake.

Claims (1)

The stand contains a bed 1, in the lower part of which sand is poured to improve. Stand stability and vibration absorption, the swing arm 2 with the housing 3, which for the best self-installation according to the test pneumatic tool has the ability to swing. F3 housing 3 mounted 1 hydraulic brake 4 consisting of two hydraulic cylinders 5 and a freely rotating disk 6, and support roller 7. Disk 6 interacting with the mandrel 8 imitating the grinding wheel and clamped pneumatic tool chuck, provides a cool pneumatic tool loading moment, and the roller 7 supports the pneumatic tool during testing. The brackets 9 with clamps 10 serve to fasten the pneumotool. The brackets 9 are attached to the bed 1 through elastic elements 11, which are vibration pads and allow the pneumotool to be fixed loosely. A lever 12 is pivotally attached to the frame 1, in which the body of the hydraulic or pneumatic cylinder 15, which acts as a load, moves from the limit switch 13 to the final switch 14, which results in a change in pressing force. A scale 16 of pressing force and load torque is attached to lever 12. The position of the lever 12 is determined by the stop 17 mounted on the frame, to which it is pressed by a spring 18 located inside the pneumatic cylinder 19. The spring 18 prevents spontaneous movements of the lever-loading system, and the pneumatic cylinder 19, compressing it, frees the lever-loading system for the duration of the tests under load. The pressing force of the non-mandrel 8 through the disk 6, the roller 7 and the lever 2 is transmitted through the control hydraulic cylinder 2 O, the pressure in which varies according to the position of the load on the lever rod 12. The control hydraulic cylinder 2 O. the stem and body of which is hinged on the lever - the rod 12 and the lever 2, are hydraulically connected with the cylinder 5 of the hydraulic brake 4. This provides automatic control of the magnitude of the load torque depending on the magnitude of the pressing force applied to the pneumatic tool, i.e., every constant value corresponds to the pressing force values at the defined torque value ki LOAD. Replenishment of leakage losses is made from tank 21 with a check valve 22. A bed 1 with all the mechanisms mounted on it is mounted on the floor on a vibration control unit 23, which reduces the influence of external vibrations. The sensors 24 of the vibration measuring equipment are installed at the points of contact between the hands of the worker and the pneumatic tool, the devices 25 for measuring the vibration characteristics are installed on a separate table. The stand works as follows. The pneumatic tool to be tested is mounted on the brackets 9 and clamped using clamps Y. Sensors 24 are installed at the points of contact between the worker’s hands and the pneumatic tools. lever cargo system. Under the action of the cylinder cylinder 15 lever-rod 12 and lever. 2 is rotated until the disk 6 and the support roller 7 are in contact with the mandrel 8. Thus, the weight of the cylinder 15 through the lever system and the control cylinder 2O provides a pressing force, and the hydraulic brake 4 together with the hydraulic cylinder 2O converts the weight cylinder 15 at load torque. The supply of fluid or air to the cylinder 15 causes it to move along the lever rod 12 within the limit switch 13 to the final switch 14, which simulates a change in the feed force and torque of the load applied to the pneumatic tool during operation. An invention stand for testing hand-held machines, such as pneumatic radial grinding machines, comprising a stand with mounted loading mechanisms with variable force and torque, characterized in that, in order to automatically adjust the torque, depending on the magnitude of the loading force, the loading mechanism is made in the form of two swinging arms and is equipped with a control hydraulic cylinder, the rod and the body of which are pivotally connected with; Kachaychischis levers, on the oshum of KOTopF.ix is mounted with the possibility of cracking a hyarocylinder, the piston of which is rigidly connected with the indicated lever, and on the second lever a torque loading mechanism, made in the form of an i-hydraulic brake with a disk, a support roller inserted into the stand to support an in-line hand-held machine, whereby the control cylinder and the cylinder are connected to the engine with the brake of the mechanism loaded with torque. Information sources taken into account in the examination 1, USSR Author's Certificate NO 478087, class, B 23 B 25 / On, 1974. 7 ff S Yu fSJS p 2 p 21/7