We use a pendulum punching test machine, if not performed correctly, there will be some difficult issues, the following test machine Cheung Lee to help you answer.
Fault: the dial pointer sensitivity poor, have stopped halfway after unloading phenomenon, or frequent changes in the zero position, the cause of this phenomenon is multifaceted, a toothed pulley rod and rail excessive dust, rust. At this point you need to remove clean, plus the promise watches less oil. 2. pointer rotating shaft dirty, clean contact between the tablet and 3. The gear lever gear lever, loosen 4. The buffer should return oil adverse circumstances, should be adjusted or cleaned. 5. Force the belt off the piston or too loose (so that the piston can not uniform operation) 6 piston friction force increases in the fuel tank or stuck phenomenon, the application of oxide abrasive paste on the research network until normal. 7. Raising the pendulum has in the course of obstacles, or shaft is dirty or corroded, the pointer back to zero big change.
Failure II: tensile test, the specimen fracture always off on both sides, the cause of this phenomenon, we must first consider the main part of the installation test machine is not the pituitary, such as the exclusion of this reason, from the following three aspects excluded. 1. When the clamping jaws did not put a positive shall be required to make good specimen clamp jaws symmetrical jaw 2. poor quality, tooth damage, in addition to the effects of different jaw, but also makes the testing process test to slip, so that the yield point is difficult to identify, then replace the jaws 3. Lift cause wheel adjustment is not correct, the upper and lower jaw misalignment, should be processed a test rods, after the upper and lower jaw tension to force the column is based on two dial indicator measure until the adjusted qualified so far.
Failure three: Pendulum position is not normal, the pendulum of misaligned mark, mainly because of the viscosity of the oil is too large or the oil is dirty, troubleshooting. Replace the appropriate viscosity oil. Greater rotational force piston friction or does not rotate, Remedy: detecting whether or not the level of impact testing machine, exclude force the piston failure, instability friction Remedy: Clean the pendulum shaft bearing, gear lever, pointers, wire wheel adjustment Good test machine level, reduce the presence of unstable friction.
Troubleshooting four: hammer back position is not normal, when the fast slowly, under normal circumstances, the buffer can be screwed into the proper position, however, if the buffer hole is blocked, or cushion valve ball and as soon as there is contact portion Dirty or gap is too large, it will cause buffer failure. The solution is to clean the cushion valve, ball and seat adjustment gap around 0.5mm, place the needle knob, so that the gap between the needle and the body is reduced, re―list the signs, and, when the temperature greater impact , it may be appropriate to replace the oil.
