Herstellung, Reparatur und Ersatzteilfertigung
Central Lubricator Grützner Model EZ
Description of the Central Lubricator Model EZThe central lubricator has a separat supply pump for each lubrication point. Such supply pump being unaffac- ted by counterpressure comprises a supply piston (60) and a control piston 61. When the supply piston car- ries out its suction stroke, the control piston follows its movement until an adjustable stop (62). As per the extent of regulation made by means of the notched setscrew (64), a vacuum is built between the supply piston and the control piston so that oil ist aspirated into the interior cylinder space. The aspirated amount of oil is always larger than the quantity to be supplied. The not used excess is returned in order to obtain compensa- tion with rrespect to the conveying efficiency of thin and viscous oils. The oil now passes through a channel and arrives at the dropcounter b where it drips off, in a visible and measurable manner, by means off gauga glass, into a control cup c. Also the control cups are separate for each point of lubrication. The oil leaving the control cup arrives at the feed piston (59a) by which it is forced through the sleeve valve (65) to the outlet. After completion of the feed stroke, the sleeve valve (65) is mechanically closed by cam and lever action (23). Cam d must follow the rotary motion of the crankpin. Thus, greatest care must be taken that the sense of rotation is correct. If the lubricator shall rotate in opposite direction, the crankshaft must be reverted so that cam d follows again the crankpin motion. Slip oil if any is collected by the balanced recesses in the feed piston (59a) and the sleeve valve (65) and then returned to the contol cup c. For this reason, troubles in pump operation becomes evident by the control device.
Adjustment:Regulation of the feed quantity is made by setscrew adjustment. Turning the setscrew (64) in clockwise direc- tion, the amount of oil is increased where as counter-clockwise adjustment gives a decrease of the oil quan- tity. Securing og the setscrew against unintentional turns is assured by means of a lock spring (63). If a pump shall be completely shut off, or fully opened the setscrew must be turned in counter-clockwise direction, or in clockwise direktion, until resistance is felt. Then, half a back-turn, is required.
Installation:The apparatus should preferably be fitted in a place, where the machine and dripping of the oiler can most easily be inspected. Then oil conduits should be as short as possible but it is advisable to use more piping if thereby the drip control is simplified.
Drive:As a rule the drive is effected by means of a double roller ratchet on to the crank-shaft without gearing (Fig.2). The drive can also be made by means of a switching mechanism comprising a larger number of shims. In the case of oilers with over 24 points the drive is transmitted through on upper shaft in order to obtain a uniform load on the crank shaft. The angel displacement of the actuating lever should, if possible, be not more than 60° and not less than 10°. According to the viscosity of oil the crank-shaft should run not less then 1 r.p.m. and not more than 12 r.p.m. in case of thick viscous oil and 30 r.p.m. in case of liquide oil. Drive can also be made by means of ratched mechanism with a rather large number of shims. In the case of central- lubricators comprising more than 24 points of lubrication, drive is effected through an upper shaft so that uniform loading of the crankshaft is ensured. In the case of built-on step gearings, care must be taken that they are filled with oil before being put into operation. For central oiling systems with increased speed of rotation, e.g. 1:1,75 the version as shown in sectional view fig. VI is applicable.
Supplement for the Grützner-Central Lubricator EZDThe Grützner central lubricator EZ are also supplied of pressurized design, then designated Model EZD. In the case of this model, top plate and cover plate of the lubricator are sealed, in such a manner that there is no risk of leakage even if an excess pressure results. All tapped holes for which provision is made in the casing for top plate and cover plate are in the form of blind holes so that oilleakage along the threads is also avoided. An important feature of the model EZD lubricator is that the control piston (61) is loaded by a corresponding spring (69). Owing to such characteristic, an unintentional adjustment of the dosed quantity due to excess pressure in the casing is impossible. Instead of a bayonet lid (7,) provision is made for a venting device which must be opened for the first oil filling so that the air contained in the oil tank can escape. After the tank has been filled, this venting device must at any rate be closed again. Oil feed from a reservoir being at a higher level is possible, through a bore in the casing which can be screwed completely tight. Usually, this bore has a thread R 3/8″. The oil level in the higher level reservoir should by no means be higher than more than 3 metres above the base of the equipment. When opening the top plate or cover plate of the lubricator, or when remo- ving the control mechanism, it must be guaranteed that the oil feed has been shut off.