SU1232202A2 - Arrangement for mincing tea mass - Google Patents

Description

one

The invention relates to the food industry and is an improvement of the invention according to the author. No. 511059.

The purpose of the invention is to increase reliability in operation, reduce energy consumption while improving the quality of the product by eliminating overheating from friction on the device parts.

FIG. 1 shows a device dp of grinding the tea mass, the general view {in FIG. 2 is a section A-A or FIG. in fig. 3 is a front view of the knife in FIG. And - a knife, side view on fig. five-

12

Section BB in FIG. 3; in fig. 6 - external grille, on. FIG. 7 is a section bb of FIG. 6; in fig. 8 — node I in FIG. one.

The device for grinding the tea mass includes a hopper 1 with a metering unit, a cylindrical body 2 with corrugations 3 on the inner surface, auger 4, a cutting mechanism consisting of the inner grid 5 and mounted on a separate shaft 6 of the knife 7, and a drive. The screw is made two-star, and the cutting edges 8 and 9 of the knife 7 are made of different widths and are angled one relative to another inside the body of the knife 7.

Behind the knife there is an outer grill 10 with holes 11, stretched out to the lUMH in the radial direction. Lattice 10 and knife 7 are set No. 3 p. possibility of axial movement. The hub of the knife 7 has on its outer shank a cup 13 fixed on a radial-thrust bearing 12, which is included in a threaded connection with the hub of the outer grill 10, made in the form of a hollow cylinder with internal and external cutting, which in turn is connected with an izhyushy nut 14 The dispenser is a rotating yalki 15 with a paddle and mounted on a cylindrical body.

Double-threaded auger 4 and the cutting mechanism is installed inside the cylindrical body 2. The width of the working face 8 of the knife 7, directed toward the outer grille 10, is greater than the width of the working face 9, directed in the opposite direction. The knife 7 is provided with a ring 16 of rigidity, the inner surface of which has

t5

ten

32202

bevel towards the supply of material. The shank of the blade 7 of the knife 7 protruding through the internal grille is placed in the central hole of the grille 5, the Glass 13 is mounted for axial movement inside the shank of the external grille 10. The internal grille 5 is rigidly fixed on the housing 2, and the external grille 10 is mounted for axial movement in the hub of the pressure nut 14. Last fixed on the housing 2.

The internal grid 5 is in the form of a disk with spiral-shaped channels (not shown), and the external grid 10 is made in the form of a disk with holes 11 that extend in the radial direction.

The shaft 6 of the knife 7 is placed inside the hollow shaft 17 of the screw 4. The drive of the device consists of an electric motor 18, which is connected via a pulley 19 and 20 to a belt drive with a 25 speed gearbox 21, including two two-speed gears, cocTt of gears 22-29. The shaft 6 of the blade 7 is rotated by means of gears 22 and 23 or 24 and 25, and the shaft 17 of the screw 4 by means of gears 26 and 27 or 28 to 29.

20

thirty

five

0

five

0

five

The number of revolutions is set depending on the quality of the processed tea and the degree of grinding.

The device works as follows.

The internal grid 5 is inserted and rigidly fixed to the housing 2. By axial movement of the glass 13 with the hub of the knife 7 placed inside, the required 11 ”gap from 0.05 to 0.1 mm between the internal grid 5 and the knife 7. Further axial movement naggzhnoy lattice 10 set the desired gap from 0.05 to 0.1 mm between the knife 7 and the outer grid 10. Then turn on the electric motor 18, which causes the rotational movement of the shafts 6 and 17.

A large fraction of the tea mass is fed into the hopper 1 to the rollers 15. From here, the tea mass is metered with a continuous flow of the screw 4 to the cutting mechanism. Large impurities remain on the surface of the rolls 15.

With the passage of the spiral channel of the inner grid 5, the tea mass moves in a spiral in the direction of rotation of the knife 7. The mass is subjected to singing. In this case, due to the presence of a gap between the knife 7 and the bars 5 and 10, friction between them is eliminated. The cut mass under the action of the pressure carried out by the screw 4 and the buoyant force arising from the difference in width of the cutting edges 8 and 9 of the knife 7 as it rotates is pushed between the blades 8 and 9 of the knife 7 and is secondarily cut between the cutting edges of the other side of the knife 7 and the outer grille 10. After this, the tea mass is pushed through the radially elongated holes 11 of the outer grill 10, pressed out and directed to the following operations. The use of a gap between the knife and the grating in tea-grinding machines more than the minimum thickness of the tea leaves is unacceptable due to the fact that this can cause free passage of tea leaves without cutting between the cutting surfaces. Passing the tea leaves without cutting in turn reduces the number of crushed cells, which negatively affects the quality of the finished product. In addition, the hitting of tea leaves between the knife and the grill surfaces significantly increases the friction force, which increases the temperature of the cut mass, which negatively affects the product quality and increases the energy consumption for knife rotation and, accordingly, the device as a whole per unit of production.

The use of the gap between the knife and the grating with a size close to zero for the cutting process is positive. However, since the blade of the knife is a cantilever beam, on the end surface of which the axial load acts, which is expressed in significant quantities, the use of a gap of the specified value is unacceptable.

This load causes elastic deformation of the blade of the knife, as a result of which its end surface, especially in the peripheral part, will come into contact with the end surface of the lattice. This in turn causes friction between those indicated

5 S f5 20 25 o

five

0

surfaces and, accordingly, heating of the surfaces and tea mass. Friction increases the device's required power per unit of production, and heating affects the quality of the finished product. In addition, the heating of the tea mass when cutting a semi-finished tea creates the danger of igniting the tea mass.

It was established experimentally that if such a gap is established with respect to fixed gratings, in the process of operation significant loads act on the knife that increase the pre-established gap between the knife and the inner grid and completely select the gap /: between the knife and the outer grid, resulting in large friction force.

Friction between the knife and the outer grille causes an increase in electric power and strong wear on the working surfaces of the knife and the outer grille. Wear, in the CBOjo queue, leads to a further increase in the gap between the knife and the inner grille, the process progresses rapidly, and the machine goes out of order. The process of repairing the machine entails a high consumption of materials, labor, time (dismantling and installation of the line).

Thus, in order to increase the reliability of operation, reduce energy consumption with simultaneous 1m increase in the quality of the product by eliminating overheating from the friction of the device parts, it is necessary to regulate the rf to maintain the required gap between the knife and the grids.

In the proposed device, the internal grille 5 is rigidly fixed to the housing 2. The knife 7 and the external grille 10 have the possibility of translational movement along the axis of rotation of the knife in both directions. The external grille 10 is provided with a cylindrical shank hub with threaded surfaces. By means of an external threaded surface, the hub of the grill 10 is connected to the pressure nut 14, inside which there is also a threaded surface. Screwing the pressure nut 14 onto the body 2 at the same time performs the translational movement of the grid in the axial direction (since the rotation of the grid 10 is limited), which makes it possible to adjust and maintain the gap between the outer surface of the knife 7 and the inner surface of the lattice 10. Into the inner surface of the hub of the grille 10. On the inner surface of the cup 13 by means of a radial-stop ball bearing, the hub 7 is installed through the hub, which ensures a rotation. The rotation of the cup 13 relative to the grid 10 makes it possible to regulate and maintain the necessary clearance between the fixed grid 5 and the inner surface of the knife 7.

Thus, the proposed contour of the device makes it possible to adjust the necessary clearance on both sides of the knife 7 between its surface and the surfaces of the grids. The use of the glass with the inside of the hub of the knife 7 installed with the possibility of axial movement inside the hub of the outer grille, mounted with the possibility of axial movement in the hub of the seal, makes it possible to provide a gap between the knife and the grilles of 0.05-0.1 mm.

This prevents friction between their working surfaces and thus premature failure of the knife and the grids. The possibility of temperature povysheno between rubbing surfaces, resulting in reduced energy consumption for the rotation of the knife. .

In addition, due to the constant clearance of 0.05-0.1 mm

prevented the passage of uncut tea, which increases the reliability of the device. The quality of the final product by reducing the temperature during the cutting process

increased by 0.05 points.

f (-f

FIG. 2

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Yu

P

bb

about

FIG. five

Figm

AT

AT

in-in

7

FIG. b

VNIIPI Order 2672/3 Circulation 543 Subscription Proizv.-poly. pr-tie, Uzhgorod, st. Project, 4

Claims (1)

* 511059. cl. A 23 F 3/00, 1974.., DEVICE FOR GRINDING TEA MASS by ed. No. 511059, characterized in that, in order to increase reliability in operation, reduce energy consumption while improving the quality of the product by eliminating its overheating from friction on the device parts, the external grill and knife are mounted with the possibility of axial movement, while the knife hub has on its outer a shank mounted on a bearing cup, included in a threaded connection with the hub of the external grill, made in the form of a hollow cylinder with internal and external threads, which is connected with a pressure nut.