US3319898A - Bar-mills used more particularly for the preparation of inks and paints - Google Patents

Bar-mills used more particularly for the preparation of inks and paints Download PDF

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Publication number
US3319898A
US3319898A US369219A US36921964A US3319898A US 3319898 A US3319898 A US 3319898A US 369219 A US369219 A US 369219A US 36921964 A US36921964 A US 36921964A US 3319898 A US3319898 A US 3319898A
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bar
cylinder
pressure
cavity
groove
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US369219A
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English (en)
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Brizon Jean Marie Annic
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/10—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member
    • B02C4/18—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member in the form of a bar
    • B02C4/22—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member in the form of a bar specially adapted for milling paste-like material, e.g. paint, chocolate, colloids

Definitions

  • the force which tends to lift the bar under the effect of the hydraulic counter-pressure in the cavity is directly proportional to the surface area of the groove, and therefore to the width of the groove for a given cylinder.
  • a very wide bar millimeters for example
  • a cavity which is also very wide.
  • the width of the said cavity reached 40 millimeters, that of the lips having a total of only 10 millimeters, which corresponds to a ratio between the total width of the lips of the bar and that of the cavity which is less than unity and may fall as low as 1/4.
  • the cavity was thus finally up to 40 times wider than during all the first tests which led to the filing of the above-mentioned patent.
  • a first means for cont-rolling the leakage flow may be simply constituted by a valve with micrometric regulation, preferably arranged on a conduit which returns the pulp to the hopper.
  • This valve is associated with a pressure-gauge enabling the pressure of the pulp in the cavity to be maintained at the value which corresponds exactly to the desired fineness.
  • This regulation may advantageously be automatic and not manual only, for example by means of an elastic diaphragm subjected to the counter-pressure of the pulp and coupled to the moving part of the valve, which thus becomes self-regulating.
  • a second regulating means rests on the fact that a barmill, the cylinder of which carries away the pulp by adhesion at a thickness determined by the clamping pressure of the bar, may be considered as a volumetric machine.
  • the regulation of the pressure to a value different from that which is spontaneously established in a closed cavity in the said bar (which can be determined by a pressure gauge and which results from the leakages under the lips of the bar, these leakages depending in turn on the width of the lips) may be obtained by utilizing a volumetric pump having an output which is a fraction of that of the mill, which is coupled to a suction conduit terminating in the cavity in the bar and which preferably discharges into the hopper.
  • This pump is preferably of the gear type and may be mechanically driven by the rotating cylinder of the mill, but it may alternatively be provided with its own driving means. Its output may be made variable by modifying its speed and even when so required by modification of its unitary volume as a function of the back-pressure in the cavity.
  • the bar is generally rigidly fixed to a hopper located above the cylinder and containing the pulp to be ground, which flows by gravity through a port or interstice existing between the hopper and the cylinder along the greater part of a generator line of the said cylinder, except necessarily at the extremities of the hopper at which the latter bears on the cylinder.
  • a grinding bar is not generally supplied with pulp up to its two extremities, properly so-called, at which there is all the more risk of occurrence of seizure at high degrees of pressure of the bar against the cylinder.
  • the invention permits these risks to be substantially reduced, including at the extremities, the inventor determined to make use of the pulp in course of grinding contained in the cavity of the bar to lubricate the extremities of the said bar, even beyond the width of the supply from the hopper.
  • the output lip of the bar may be given a constant width over the entire length of the bar without any disadvantage, since it is thus supplied almost up to its extremities by the ground product passing out of the cavity in the bar.
  • FIG. 1 is a vertical section of a grinder in accordance with the present invention, provided with a volumetric regulating pump and a pressure gauge.
  • FIG. 2 is a perspective view of a bar with a cavity and a pressure gauge according to the invention, turned over and partly cut away in order to show the regulating valve and the particular shape of the extremities of the groove with which it is provided.
  • FIG. 3 is an enlarged diametral section of the valve shown in FIG. 2.
  • FIG. 4 also shows an alternative form of the selfregulating valve.
  • a paint mill which comprises an offset hopper 2 and a bar 4 arranged at the upper part of the cylinder 1.
  • This bar is provided with a groove which extends over its entire length and forms a cavity 9 with the surface of the cylinder.
  • the bar is applied against this cylinder in a manner known per se by the pressure of a fluid acting on a number of jacks 5, 6, distributed along its length and provided with a common source of supply (not shown).
  • a scraper device 5 is arranged at the lower part of the cylinder.
  • a gear-pump 10 driven in rotation by the cylinder 1 at an appropriate speed, for example by means of two toothed wheels 21, 22 connected together by a chain 23, is provided with an input conduit 11 which terminates in the cavity 9 of the bar 4f, and an outlet conduit 12 which preferably delivers into the hopper.
  • the easy modification of the diameter of the toothed wheels 21 and 22 enables the speed of rotation of the pump and therefore its output to be adjusted to the nature of the pulp in course of grinding (viscosity of the binder, mean size and hardness of the pigments in particular).
  • the pump can be directly driven, its output always remaining very small as compared with that of the mill, by means of a small electric motor which may have several speeds of operation, if so required.
  • a pressure gauge 29 is preferably provided on the bar and put into communication with the cavity 9 or, which. comes exactly to the same thing, in view of the relative magnitudes of the pressures and losses of pressure due to the conduit system, on the suction conduit 11 of the pump 10
  • This pressure gauge not only makes it possible to verify the uniformity of the pressure in the cavity of the bar and the correct operation of the grinder, but also the fluid tightness of the pump and its supply conduits and the proper running-in of the bar.
  • the cleaning of the device is facilitated by the pump 10f if the groove 9 of the bar is provided with a cock at its extremity opposite to the conduit 111. In fact it is only necessary to open this cock and to run the pump while supplying the groove with a small quantity of a solvent such as white spirit to clean the cavity, the pump and the piping system. The solvent is delivered into the hopper and also permits this latter to be cleaned.
  • FIGS. 2 and 3 relate to an alternative form of construction, very advantageous by reason of its great simplicity of construction, according to which the regulation of the pressure in the groove 9 of a bar 4g is obtained by means of a pressure gauge 26 and a micrometric valve which has the general reference number 24.
  • the bottom of the groove 9 is provided for that purpose with an orifice 25, preferably of elongated section, which communicates with a bore 26 bringing back the excess of pulp to the hopper arranged against the rear face 27 of the bar 4g.
  • In the bore 26 can move a ground rod 26a, on which an axial displacement can be impressed by means of the combination of a nut 28 rigidly fixed to the bar 4g and a threaded rod 26b coupled to the rod 26a.
  • the pitch of the screw 26b and graduations carried by the knob 29 at its periphery opposite a reference mark eventually forming a vernier scale carried by the dog 30, are such that the section of the orifice 25 which is not closed by the rod 26a can be regulated in a very precise manner (for example to the nearest hundredth of a millimeter).
  • the operation of a mill with a single cylinder is characterized by the accuracy but also by the stability of the regulation of the back-pressure in the cavity of the bar, this back-pressure being closely related to the fineness of grinding.
  • This regulation is possible and even readily obtained irrespective of the force applied to the bar by the hydraulic clamping jacks.
  • This force may reach high values, very much greater than those of current practice and amounting without disadvantage to and even tons.
  • Outputs in the vicinity of 200 kilograms of pulp per hour in the case of a pigment with a base of rutile, for example
  • valve 26, 26a self-regulating (see FIG. 4), by coupling the ground rod 26a to an elastic diaphragm 26c which is subjected on one of its faces to the pressure in the groove and which is rigidly fixed to a screw similar to 26b through the intermediary of an elastic member 26]), the adjustable tension of which finally determines the opening of the said valve and the fineness of grinding.
  • No fluid-tight joint of the sliding type is necessary with this form of embodiment, which enables the pressure inside the cavity of the bar to be determined before the machine is put into operation.
  • the elastic member may even have a calibration such that when it is set to the minimum by the knob 29, the valve maintains in the groove a back-pressure suflicient to prevent any seizure.
  • a cylinder bar-mill comprising a distributing hopper for the material to be ground, said hopper having an input opening and an output opening, a cylinder positioned immediately adjacent said output opening, a bar pressed against said cylinder by means of fluid actuated jacks,
  • said bar having two longitudinal lips separated by a groove which is closed at its extremities and which is spontaneously filled with material in the course of grinding, the width of said groove being greater than the thickness of the two lips combined, said mill being further provided with controllable discharge means for discharging the material which fills the groove, said discharge means comprising a conduit system connecting the groove of the bar to a container for the discharged material, and screw means with a micrometer thread for progressively closing said conduit system.
  • a cylinder bar-mill comprising a distributing hopper having both an input opening and a discharge opening and containing therein the material to be ground, a cylinder closely adjacent said discharge opening, a bar pressed against said cylinder by means of fluid actuated jacks, said bar having two longitudinally extending lips separated by a groove which is closed at its extremities and which is spontaneously filled with material in the course of grinding, the width of said groove being greater than the thickness of the two lips combined, said mill being further provided with controllable discharge means to discharge the material which fills the groove, said means comprising a conduit system connecting the groove of the bar to a container for the discharged material, a flexible wall the sides of which are respectively submitted to the action of the pressure of the material which fills the groove and to the action of an adjustable elastic calibration means, and a rod rigidly fixed to said wall and progressively controlling the opening of said conduit system in response to movements of said wall.
  • a cylinder bar-mill comprising a distributing hopper containing the material to be ground and having both input and discharge openings, a cylinder mounted adjacent said discharge opening, a bar pressed against said cylinder by means of fluid actuated means, said bar having two lips separated by a groove which is closed at its extremities and which is spontaneously filled with material in the course of grinding, the width of said groove being greater than the thickness of the two lips combined, said mill being further provided with controllable discharge means for the material Which fills the groove, said means comprising a conduit system connecting the groove of the bar to a container for the discharged material, and a volurnetric pump disposed in the conduit system and driven 1n rotation by the cylinder of said mill.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
US369219A 1963-05-31 1964-05-21 Bar-mills used more particularly for the preparation of inks and paints Expired - Lifetime US3319898A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR936779A FR83739E (fr) 1963-05-31 1963-05-31 Perfectionnements aux broyeurs à barre utilisés, notamment, pour la fabrication des encres et peintures

Publications (1)

Publication Number Publication Date
US3319898A true US3319898A (en) 1967-05-16

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ID=8805185

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US369219A Expired - Lifetime US3319898A (en) 1963-05-31 1964-05-21 Bar-mills used more particularly for the preparation of inks and paints

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US (1) US3319898A (enrdf_load_stackoverflow)
BE (1) BE648163A (enrdf_load_stackoverflow)
CH (1) CH427471A (enrdf_load_stackoverflow)
DE (1) DE1301703B (enrdf_load_stackoverflow)
FR (1) FR83739E (enrdf_load_stackoverflow)
GB (1) GB1050853A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114985044A (zh) * 2022-07-20 2022-09-02 耒阳市百汇粉体有限公司 一种碳酸钙粉体生产的粉碎研磨装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4223152C1 (de) * 1992-07-14 1993-10-21 Sanol Arznei Schwarz Gmbh Vorrichtung und Verfahren zur Herstellung eines Mikrosteckverbindungselementes sowie elektrische Versorgungsleitung mit wenigstens einem Mikrosteckverbindungselement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE66312C (de) * L. PH. MEYER in Erlenbach bei Heilbronn a. N Französischer Rundwirkstuhl zur Herstellung unterlegter Farbmuster
GB494636A (en) * 1937-07-23 1938-10-28 Ludwig Schoeffel Improvements in grinding bars for single and multiple roller machines
US3206129A (en) * 1961-04-22 1965-09-14 Brizon Jean Marie Annic Rod-mills used especially for the manufacture of inks and paints

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR713953A (fr) * 1930-03-27 1931-11-05 Grinding Mixing Separating Eng Broyeur monocylindrique pour couleurs cellulosiques et matières volatiles
DE669356C (de) * 1937-06-27 1938-12-23 Springer & Moeller Akt Ges Walzenmuehle mit Reibbarren

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE66312C (de) * L. PH. MEYER in Erlenbach bei Heilbronn a. N Französischer Rundwirkstuhl zur Herstellung unterlegter Farbmuster
GB494636A (en) * 1937-07-23 1938-10-28 Ludwig Schoeffel Improvements in grinding bars for single and multiple roller machines
US3206129A (en) * 1961-04-22 1965-09-14 Brizon Jean Marie Annic Rod-mills used especially for the manufacture of inks and paints

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114985044A (zh) * 2022-07-20 2022-09-02 耒阳市百汇粉体有限公司 一种碳酸钙粉体生产的粉碎研磨装置

Also Published As

Publication number Publication date
BE648163A (enrdf_load_stackoverflow) 1964-11-20
FR83739E (fr) 1964-10-02
CH427471A (fr) 1966-12-31
GB1050853A (enrdf_load_stackoverflow)
DE1301703B (de) 1969-08-21

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