US2546654A

US2546654A - Contrivance for determining the degree of beating of fiber mass suspensions

Info

Publication number: US2546654A
Application number: US724029A
Authority: US
Inventors: Qveflander Thor Gustaf
Original assignee: ABLSTROM OSAKEYHTEO A
Current assignee: A ABLSTROM OSAKEYHTEO; ABLSTROM OSAKEYHTEO A
Priority date: 1946-07-24
Filing date: 1947-01-24
Publication date: 1951-03-27
Anticipated expiration: 1968-03-27

Description

March 27, 1951 QVEFLANDER 2,546,654

CONTRIVANCE FOR DETERMINING THE DEGREE 0F BEATING OF FIBER MASS SUSPENSIONS Filed Jan. 24, 1947 2 Sheets-Sheet 1 INVENTOR. THOR G as TAF C) VB FLANDER ATTORNEY.

March 1951 T G QVEFLANDER 2,546,654

CONTRIVANCE FOR DETERMINING THE DEGREE 0F BEATING OF FIBER MASS SUSPENSIONS Filed Jan. 24, 1947 2 Sheets-Sheet 2 INVENTOR. THOR Gus TAF QVEFLANDE ATTORNEY Patented Mar. 27, 1951 CONTRIVANCE FOR DETERMINING THE DEGREE F BEATIN G OF FIBER MASS SUSPENSION S Thor Gustaf Qveflander, Karhula, Finland, as-

signor to A. Ablstrom Osakeyhteo, Karhula Bruk, a corporation of Karhula, Finland Application January 24, 1947, Serial No. 724,029 InFinland July 24, 1946 Claims.

The invention here presented relates to a contrivance for automatic determination and continuous registration of the degree of beating of fibre mass suspensions. The invention is based on already known apparatus for determination of the degree of beating of pulp. All of this apparatus is affiicted with the drawback of requir ing manual operation, thus being slow and inconvenient in use, necessitating moreover tedious 1determinations of the consistency or the dry conent.

In the manually operated contrivances previously known the. suspension is fed into a cylinder the bottom of which consists of filter cloth. On. this cloth a layer of pulp forms, the thickness of which depends on the degree of fatness of the pulp. The water running down throughthe filter cloth is collected in a conical funnel with a smallopening in its point. The dimensions of this hole bear a fixed relation to the diameter of an overflow arranged above this hole. The water running out of the hole and the overflow respectively is collected in graduated measuring cylinders placed below them.

The advantage in the use of the contrivance disclosed in the invention here presented is that it can by means of an auxiliary contrivance with adjustable timer be adjusted to completely automatically and continuously determine and register'the degree of beating at fixed time intervals.

The contrivance according to the invention here presented consists of a perforated cylinder that can be raised and lowered, equipped with a conical bottom out of which issues a vertical pipe which continues on down through the bottom of a pulp container. The cylinder is immersed in a pulp suspension of known concentration, causing a layer of pulp of a density depending on the fineness of the pulp to form on the perforated surface of the cylinder. The quantity of water that filters through the perforated cylinder walls during the formation of the pulp layer and runs off through the vertical pipe is collected in a "funnel of the same construction as used in previously' known contrivances of this kind, thence going on through an overflow to a measuring cylinder equipped with a float designed to operate a registering device by means of a lever.

Figure 1 is a side elevation of a device in acd'ash lines.

Figure 2 is an enlarged fragmentary elevation 1 Figure 3 is a vertical section of the fragment shown in Figure 2,, and taken on line 33 of Figure 2 and looking in the direction of the arrows.

The contrivance is actuated by means of a tilting device I consisting of two water containers 2. and 3- so arranged that each, after filling, tilts and empties, moving, the other into filling position. The tilting arrangement itself, is shown. by dashed lines in the drawing, being located immediately adjoining and outsideof a container 31 situated in the lower portion of the contrivance and being connected with the latter by means of an opening 39, through which. the water running in turn out of

scoops

2 and 3 is carried off. The tilting arrangement is surrounded by a casing 5| fastened to the container 31 also at the sidewall of the same that, is extended upward 52.. The motion of the tilting arrangements axle 4 turns the chain pulley 5 and by means of the chain 6 actuates the four-way valve 1, which, distributes water under pressure to two hydraulic pistons 8 and 9, which are thus caused to move up and down at greater or lesser time intervals by regulating a water-inflow circuit Hi to the tilting arrangement I.

When the tilting arrangement l turns the four-way valve 7 so that the pistons 8 and 9 moving in cylinders I5 and it move downward, a sluice-gate H actuated by piston s is quickly closed, causing the pulp suspension continuously streaming from a concentration regulator through port l3 into trough l2 to be damned up and to rise until it runs. oii through an overflow 34 in the trough and down a relatively wide drainpipe 35 to the container 31", which is located in the lower part of the apparatus and is equipped with drain 36. The inflow through port l3 to trough I2 goes through an arrangement in the nature of a water lock 53, which permits the level of the dammed-up pulp suspension to be regulated solely by the height of the overflow 3-45, independent of variations in feedfrom port IS.

The other piston 8, which is connected with a perforated, perpendicular cylinder l4, lowersthe latter slowly down into the pulp suspension in trough l2 and thus furnishes the run-off water to be measured in measuring cylinder l1, causing a line to be registered on graph paper strip [8, while a portion of this water runs. directly down into container 3'! through an opening 54 in the point of tunnel 2! located under the vertical pipe IS. The funnel 2| has. an overflow in the shape of a tube 20 of suitable diameter in relation to the opening 54. The speed with which cylinder l4 moves can be regulated by adjusting the exhaust valve 38 of cylinder l5. The upward and downward movement of the sluice-gate is always practically instantaneous.

When the measurement has been registered on the graph paper I8 the four way valve 1 is then turned, causing the pistons 8 and 9 to be moved upward. As already pointed out, the piston 9 operating the sluice gate moves quickly so that in short order the pulp suspension may stream freely through the trough [2. The other piston 8 moves more slowlyin raising the perforated cylinder I4.

As soon as the cylinder |4 together with the vertical pipe l9 connected to the conical bottom of cylinder l4 and the funnel 2| with its overflow 20 move upward, the funnel 2|, being mounted in a bearing on crosspiece 22 fastened to the vertical pipe l9, turns automatically to one side together with its overflow 20, so that the water with which the just formed pulp layer now will shortly be washed away will miss the measuring cylinder I! and run directly into the container 3?. This turning motion is accomplished by means of an angle lever 23, 24 pivoted on crosspiece 22, the levers lower end 24 being fastened to the casing of funnel 2| by means of a pin. The other lever arm 23, which consists of a stirrup-shaped part pivoted to the crosspiece 22 at both ends and firmly united with the arm 24 at one of them, is equipped with a friction shoe which bears on a slide 40 pressed against it by a spring. When the funnel moves upward the drag of the shoe on the slide turns the lever-arm 24 into position 24a, which is shown by the dotted lines in the drawing (the left-hand position). When the funnel again begins to move downward the shoe together with the lever-arm 23 is swun upward and the lever-arm 24 assumes the position 241; shown by the dash-dotted lines in the drawing (to the right).

In that the whole of the raisable and lowerable unit (the funnel 2| with the crosspiece 22, the vertical pipe I9 and the perforated cylinder l4) continues to rise, a stud 4| attached to the crosspiece 22 impinges on one end 25 of a two-armed lever swung on a pivot 42, the other end of which lever 25 correspondingly depresses a vertical rod 33 as the funnel unit rises. both a flushing valve 44 and the drain valve 45 of the measuring cylinder opening these valves against the pressure of respectively the

springs

43 and 41. The cylinder I! is thereby emptied, and the float 29 inside the same sinks to the zero position. When the stud 4| thus lifts lever-arm 25 a pin 48 or the like on the same is caught by the one arm 28 of an angle lever turning on pin 49 under the pull of spring 30. Flushing continues until the crosspiece 22 reaches its highest position and the

lever

25, 26 is released by the stud 4| impinging on the other arm 2'! of the angle lever, this allowing both the flushing valve 44 and the drain valve 45 of the measuring cylinder I! to be closed by the pressure of the

springs

43 and 41 respectively. Simultaneously the perforated cylinder M has passed through a flushing ring 32 mounted above the trough I2, and the whole apparatus is ready for the next measuring cycle, which is to take place after a time interval regulable as desired by adjusting the inflow valve u to the tilting arrangement.

When the perforated cylinder I4 again begins to move downward and before this cylinder l4 reaches the surface of the pulp suspension as This rod operates regulated by the overflow opening 34, the overflow tube 20 is automatically returned into such a position that the filtrate water to be measured runs down into the measuring cylinder IT.

We might further mention that the one arm 25 of the

angle lever

25, 26 is supplied with a latch 3|, the counterclockwise rotation of which is lim ited by a stop 46. This arrangement makes it possible for the stud 4| on crosspiece 22 to pass lever-arm 25 freely on its downward passage.

From the moveable float 29 in the measuring cylinder H the results of the measurement are transferred in the usual manner to a strip of graph paper on a drum mounted on a supporting rod 50. The drum is rotated, suitably by means of a clockwork or the like. In the drawing the float 29 is shown in both its upper and lower approximate positions. We might further mention the upand downward motion of the perforated cylinder l4 and the parts connected therewith may be brought about by means of some suitable mechanism other than the tilting arrangement here described, thus for instance by means of a servo-motor or the like, the which can be regulated to function at suitable time intervals.

What I claim as my invention is:

1. A device for determining the degree of beating of fibre mass suspensions of the type in which water is separated from the suspension by filtra tion, which comprises, a perforated cylinder, a container constructed for the flow of pulp suspension therethrough, means for causing pulp suspension to rise to a fixed level in said container, means to periodically immerse said perforated cylinder into said suspension in said container and to remove said cylinder from said suspension, a downwardly extending vertical pipe operatively connected to said cylinder, a funnel, equipped with an overflow, in registry with the lower end of said vertical pipe, a measuring cylinder mounted for reception of water from said overflow, and means operable in response to the water received in said measuring cylinder to record the level of said water, whereby the water in said suspension will run through said perforated cylinder until the mat formed on the surface thereof substantially restricts its passage and such water will be caught in said measuring cylinder, so that the characteristics of the initial fibre mass suspension may be determined.

2. A device in accordance with claim 1 and including a rotatable mounting on said vertical pipe and means for mounting said funnel on said rotatable mounting for rotation with respect to said pipe.

3. A device in accordance with claim 1 and including means to flush said perforated cylinder, means to move said funnel upwardly with said cylinder, and means operable in response to the upward movement of said funnel to activate said flushing means.

4. A device in accordance with claim 1 and including a drain valve in the bottom of said measuring cylinder, means to move said funnel upwardly, and means operable in response to the upward movement of said funnel to open said drain valve.

5. A device in accordance with claim 1 and including means to move said funnel upward, a protruding stud extending from said fuh'nel',"fa drain valve for said measuring cylinder anda flushing valve to control the flushing of said perforated cylinder, a lever mechanism operating said valves, said lever mechanism being engaged by said stud to open saidvalves during the upward movement of said funnel.

6. A device in accordance with claim 5 wherein said lever mechanism includes an upper lever arm and a lower lever arm, said upper lever arm being formed with a latch to engage said lower lever arm, said protruding stud moving said 10wer lever arm into engagement with said latch and engaging said upper lever arm to release said latch during continued upward movement of said funnel.

7. A device in accordance withclaim 1 and including means to turn said funnel about its vertical axis during upward movement of said funnel, to deflect said overflow pipe away from alignment with said measuringcylinder.

8. A device in accordance withLclaim 7 and including lever means to turn said funnel in one direction during the upward movement thereof and to turn said funnel in the opposite direction during the downward movement thereof.

9. A device in accordance withi-claim 1 and including a tilting device mounted on a horizontal axis for imparting verticalimovement to said perforated cylinder and said; funnel, said tilting device including a pair of water scoops, means to fill said water scoops alternately to tilt said device from one position to another about said horizontal axis, a pair of control cylinders, a piston in each cylinder, means on one of said pistons to move said perforated cylinder up and down, and means on the other of said pistons to introduce and remove a sluice gate from said container, a four-way valve for contr'f'liing the introduction of actuating fluid to saidff control cylinders, and means connecting saidf'f our-way valvewith said tiltable device in orderto control said valve in response to the movement of said REFERENCES CITED The following references are of record in the file'of-this patent:

UNITED STATES PATENTS Number Name Date 1,594,941 Green Aug. 3, 1926 1,838,614 French Dec. 29, 1931 1,918,782 Randall July 18, 1933 1,945,988 Witham Eeb. 6, 1934 2,346,746 Green Apr. 18, 1944

Claims

1. A DEVICE FOR DETERMINING THE DEGREE OF BEATING OF THE MASS SUPENSIONS OF THE TYPE IN WHICH WATER IS SEPARATED FROM THE SUSPENSION BY FILTRATION, WHICH COMPRISES, A PERFORATED CYLINDER, A CONTAINER CONSTRUCTED FOR THE FLOW OF PULP SUSPENSION THERETHROUGH, MEANS FOR CAUSING PULP SUSPENSION TO RISE TO A FIXED LEVEL IN SAID CONTAINER, MEANS TO PERIODICALLY IMMERSE SAID PERFORATED CYLINDER INTO SAID SUSPENSION IN SAID CONTAINER AND TO REMOVE SAID CYLINDER FROM SAID SUSPENSION, A DOWNWARDLY EXTENDING VERTICAL PIPE OPERATIVELY CONNECTED TO SAID CYLINDER, A FUNNEL, EQUIPPED WITH AN OVERFLOW, IN REGISTRY WITH THE LOWER END OF SAID VERTICAL PIPE, A MEASURING CYLIN-