RU184229U1 - Piston extruder grinding grill - Google Patents

Abstract

The utility model relates to the grinding of aquatic biological resources and can be used in reciprocating extruders for grinding both ice cream (blue whiting, stingrays and sugar kelp), and defrosted (stingrays) and blanched raw materials (stingrays). The grate for the piston extruder is made in the form of a disk with through holes located on it for forcing the crushed raw materials. Holes of the lattice - such as an hourglass. The technical result of the utility model is to increase the efficiency of using the lattice, reducing cutting forces, the possibility of using the lattice on both sides, improving the quality of the crushed product, ease of manufacture. In this case, the grate can be used for grinding both frozen, defrosted and blanched raw materials. For each type of grinded product, a grill with pre-selected diameters is installed depending on the condition and degree of grinding of the raw material. 1 s.p. f-ly, 2 ill.

Description

The utility model relates to the grinding of aquatic biological resources and can be used in reciprocating extruders for grinding both ice cream (blue whiting, stingrays and sugar kelp), and defrosted (stingrays) and blanched raw materials (stingrays).

Known cutting unit for a meat grinder (US Pat. RF No. 2171142, publ. 07/27/2001), containing knives with curved blades and blades and a grill with holes of a conical shape. The lattice holes are made with an angle at the apex of 60 °, ribs of a triangular section corrugated from the inside.

The disadvantages of this device are:

the complexity of manufacturing the cutting unit as a whole and the lattice in particular

the impossibility of grinding only through the grill without the use of knives.

Known grill for meat grinder (US Pat. RF №2136371, publ. 09/10/1999), having round holes in the cross section arranged in concentric rows with an angle of inclination to the plane of the grill in the direction opposite to the direction of rotation of the knife, the axis of each hole is simultaneously inclined at an angle α to a straight line in the plane of the lattice directed in the direction opposite to the rotation of the knife and at an angle β to a straight line directed towards the axis of the lattice. The angle α is chosen equal to α = 90 °, where α is the angle of internal friction of the product minced by the meat grinder, deg., And the angle β is determined from the ratio

where f is the coefficient of friction of the crushed product on the last turn of the screw; d is the average diameter of the last turn of the screw, mm; t is the pitch of the last turn of the screw, mm

The disadvantages of this device are:

the complexity of manufacturing the lattice,

the inability to use raw materials for grinding ice cream.

Known grill for meat grinder (US Pat. RF No. 2368423, publ. 09/27/2009), made in the form of a disk with holes for passing the crushed raw materials located on it and a keyway on the outer circumference, fixing the position of the grill in the auger body, in order to expand technological capabilities to reduce internal pressure, increase productivity, reduce energy intensity, the lattice openings are made in the form of parallel rectangular or trapezoidal grooves, and the lattice has several keyways for simultaneous installation Novki two grids being offset by an angle of rotation for the formation of through-holes of various configurations.

The disadvantages of this device are:

the inability to use a grill for grinding frozen raw materials;

work of a lattice on one side.

Known grinding grill for meat grinder (US Pat. RF No. 2440191, publ. 20.01.2012) in the form of a disk with holes located therein for passing the crushed raw materials and a Central hole for fixing, in order to improve the quality of grinding, reduce internal pressure, increase productivity, reduce the energy intensity of the grating openings is made with rectilinear walls, the perimeter of the inlet part of the opening being larger than the perimeter of the outlet opening, and the rectilinear faces of the inlet parts of the holes are in contact, forming a sharp conductive edge.

The disadvantages of this device are:

the complexity of manufacturing the lattice;

the inability to use a grill for grinding frozen raw materials;

work on one side.

The technical result, which is achieved by the claimed utility model, is to increase the efficiency of using the lattice, reducing cutting forces, the possibility of using the lattice on both sides, improving the quality of the crushed product, ease of manufacture.

часть толщины решетки, тангенс угла наклона α боковой поверхности отверстия к горизонтальной равен 6.To achieve the specified technical result, the grinding grill for the piston extruder is made in the form of a disk of constant thickness with through holes round in cross section and located on concentric circles and representing an hourglass, the height of each part of the hole being

part of the thickness of the lattice, the tangent of the angle of inclination α of the side surface of the hole to the horizontal is 6.

Thanks to the implementation of the grinding grill of this design, a reduction in the force of pushing the product through the grill is achieved by reducing the friction force on the wall of the holes, which increases the efficiency of its use and expands the field of application.

The lattice of the invention is illustrated by the drawings shown in FIG. 1, 2. In FIG. 1 shows a grid with diameters of concentric circles from d ₁ to d ₁₀ , FIG. 2 - the hole of the lattice.

часть толщины решетки (диска 1), т.е. сечение отверстия 2 уменьшается от входа к середине и увеличивается от середины к выходу. Соответственно каждое отверстие 2 имеет по два диаметра: больший диаметр 3 на входе и выходе продукта и меньший диаметр 4 в самом узком месте, т.е. посередине отверстия 2. Тангенс угла наклона α (фиг. 2) боковой поверхности отверстия 2 к горизонтальной равен 6. Изменение диаметра отверстий, который дифференцируется в зависимости от вида измельчаемого продукта, позволяет расширить область эффективного применения решеток, обеспечив при этом уменьшение усилий продавливания и высокое качество измельчения.The grinding grid is a disk 1 of constant thickness (Fig. 1). In the disk 1, through holes 2 are made round in cross section. Holes 2 are located on concentric circles. In the section of the hole 2 is an hourglass (Fig. 2), the height of each part of the hole 2 is

part of the thickness of the lattice (disk 1), i.e. the cross section of the hole 2 decreases from the entrance to the middle and increases from the middle to the exit. Accordingly, each hole 2 has two diameters: a larger diameter 3 at the inlet and outlet of the product and a smaller diameter 4 at the narrowest point, i.e. in the middle of the hole 2. The tangent of the angle of inclination α (Fig. 2) of the side surface of the hole 2 to the horizontal is 6. The change in the diameter of the holes, which is differentiated depending on the type of product being ground, allows us to expand the area of effective use of gratings, while ensuring a reduction in punching forces and high grinding quality.

Grinding is as follows.

Raw materials (frozen blue whiting, frozen, defrosted or blanched slope, frozen kelp sugar) fed into the working chamber of the piston extruder are pressed by the piston into the holes 2 of the disk 1. In this case, the raw materials are cut initially by the cutting edges of the inlet 2 of a larger diameter 3, and then by the cutting ones the edges of the holes of a smaller diameter 4. The sharp cutting edges of the grating significantly reduce the necessary pushing pressure, providing a reduction in energy consumption.

A preliminary design has been developed for the invention, several prototypes with a diameter of the central part of the hole of 7 mm, 4.5 mm and 2 mm have been manufactured and tested.

Claims (2)

1. Grinding grate for a piston extruder, characterized in that it is made in the form of a disk of constant thickness with through holes round in cross section located on concentric circles and representing an hourglass, the height of each part of the hole being 1/2 part the thickness of the lattice, the tangent of the angle of inclination α of the side surface of the hole to the horizontal is 6. 2. The grinding grate according to claim 1, characterized in that the diameter of the Central part of the holes made in the form of "hourglass" can be 7, or 4.5, or 2 millimeters, depending on the crushed raw materials.

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