TEST BED FOR PNEUMATIC IMPACT TOOLS Russian patent published in 1995 - IPC

FIELD: test engineering. SUBSTANCE: test bed for pneumatic impact tools has bedplate 1, device for installing the tool at a certain angle to the processing surface, unit for fastening the processed specimens 12 located on mobile platform 2 and charging mechanism 20. The new feature of the test bed for the pneumatic impact tools lies in the fact that it is equipped with the computer system of recording and processing of measurements including the electronic computer and the blocks recording the impact of energy, the vibration and energy parameters. The device for installing tool 48 simulative of the operator's hands with its impedance is made for one hand of the operator in the form of balance beam 4 hinged on stand 3 of bedtable 1. Clamp 5 is hinged on one end of the balance beam, transversal step bearing 6 is made on the other end. Step bearing 6 interacts with spring-loaded tared rod 7 mounted on cantilever 8 of bedplate 1 for the longitudinal fixation. A telescopic retaining tool of stand 10 with wrist elastic-swinging clamp 11 is made for the operator's other hand in the shape of bedtable 1 hinged on ear 9 and is located parallel to balance beam 4. The unit for fastening processed specimens 12 is made as coaxially located outer drum 13 with processed specimens 12 uniformly disposed along the circumference on its outer surface and inner cylindrical housing 17 mounted on shaft 14 with drive 15 for rotation on stands 16 of platform 2 connected between themselves by three pairs of springs radially mounted and uniformly disposed along the circumference and by three pairs of pneumatic rods set up coaxially to the springs and located in relation to then on the diametrically opposite sides of cylindrical housing 17. Mobile platform 2 is equipped with a pneumatic cylinder placed on its lower side. The pneumatic cylinder has a rod with the profiled head engaging with the reciprocal longitudinal groove of bedplate 1. Platform 2 is kinematically equipped with traction 33 rigidly attached to platform 2 which interacts with charging mechanism 20 by means of flexible rope 34 one end of which is attached to rod 35 of returning pneumatic cylinder 36 horizontally located on bedplate 1, the other end to counterweight 38 mounted on helical 39 and guide 40 bars for longitudinal displacement along bars 39, 40 and the fixed position on them of the bar set up on housing 41 hinged to bedplate 1 with drive 42 of rotation of helical bar 39. In this case if flexible rope 34 is disrupted, compensating spring 43 and taring dynamometer 44 are set up between traction 33 and the counterweight. The block of recording the impact energy of the tool includes acceleration transducers located in three coordinates on the interior surface of drum 13 suspended on springs 18 to cylindrical housing 17, with platform 2 being rigidly fixed to bedplate 1, and electrically connected through a filter and the analog-to-digital converter with the electronic computer. The unit of recording the vibration parameters of the tool includes the system of transducers set up on clamps 5.11 of the imitators of the operator's hands and electrically connected through the filters and the analog-to-digital converters with the electronic computers. The device for recording the energy parameters includes: flowmeter 29, pressure transducers and temperature-sensitive elements electrically connected through the filters and the analog-to-digital converters with the electronic computers. The latter is equipped with the data bank for the recorded parameters of the tool on the whole predicting the actual possibilities of the further usage of the tool in certain modes of operation and during the preset time interval. EFFECT: less power-consuming and safer handling the tool in the process of exploitation. 3 cl, 4 dwg