Hydraulic press machine pressure switch failure

Diaphragm pressure switch has the following several ways.

(1) because of plunger and absorbing bad cooperation (or framework), or due to burrs and not clean, cause of plunger die, pressure relay action. Valve core (plunger) cooperate with medium hole clearance should guarantee 0.007 ~ 0.015 mm, burr to in addition to clean, when assembly cleaned first, then the surface coating aluminum sulfide (black) lubrication. Users tend to think aluminum sulfide as dirt and to wash it, it is wrong.

(2) the rubber diaphragm rupture. Diaphragm pressure switch is the use of the oil pressure rise, bolstered membrane upward push plunger and work. When film burst pressure oil column effect directly on the plug, there will be the oil from the plunger and the fit clearance leakage out of science and technology, make its operating value and return interval have a obvious change and appear unstable phenomenon, thus caused by false start, at this time only change the new film.

(3) hydraulic press micro switch position is not fastened or pressure. DP - 63 type pressure switch of micro switch, originally only by a bolt clamping positioning, not reach, a small screw top micro switch on the back, not back. Later at the top of the micro switch and add wire after the improvement, but still lack of rigidity. When wiring, remove the screw driver, therefore, the force added to micro switch 15 and maintenance cover touch the twisted wire force, are likely to cause dislocation micro switch, change the action value, namely changes the original adjustable pressure action, and launched a signal by mistake.

(4) micro switch is not sensitive, reset sex differences. Reed elastic enough within the micro switch, contactor under pressure after it was not up, or because of the dust stick to contact the micro switch signals not mistakenly launched as normal. At this point should repair or replace the micro switch.

(5) the manufacturing precision of pressure relay is bad, such as leverage in body slot don't groove, spring seat and the fit clearance between the upper is too small, plunger size is wrong, and the pressure relay vice screw adjustment is very loose, the main levers don't press the micro switch, the pressure relay failure, etc.

(6) columns on the great circle painted aluminum disulfide wash off grease, make the plunger moves flexible and not appear misoperation.

All landowners hydraulic press for differential pressure relay, for micro switch part and drainage chamber is separated with a rubber membrane, when the drainage and oil inlet cavity, pressure oil will break the rubber diaphragm into the micro switch, so as to damage the micro switch, false action or no action. In addition, owing to the pressure regulating spring cavity and drain the cavity are interlinked, adjusting screws and no sealing device, thus in the adjustment screw will appear to outside leakage phenomenon, so the drain port and oil inlet cavity P L can't come to the (mainly for tube), and drain tank mouth L must take back alone