CN219360265U - Conical extrusion molding screw - Google Patents

Abstract

The utility model provides a toper extrusion molding screw rod, includes two conical screw rods, and the structure of two screw rods is the same, and arbitrary screw rod includes the body of rod and sets up the spiral shell arris on the body of rod, and the spiral shell arris of arbitrary screw rod stretches into in the spiral shell arris clearance of another screw rod, stretches into the spiral shell arris and corresponds the processing clearance that leaves extrusion materials between another screw rod surface, the spiral shell arris includes feeding section, melting section and ejection of compact section, the ejection of compact section is the triple spiral arris, ejection of compact section includes ejection of compact section, ejection of compact second section and ejection of compact third section, and the spiral shell arris width of ejection of compact section is greater than the spiral shell arris width of ejection of compact third section, and the spiral arris interval of ejection of compact second section is not greater than the spiral arris interval of ejection of compact third section. The utility model has the advantages that: the pushing effect is good, and smooth discharging of the materials can be realized.

Description

Conical extrusion molding screw

Technical Field

The utility model relates to the technical field of screw manufacture, in particular to a conical extrusion molding screw.

Background

The prior Chinese patent application No. CN202022747340.4 entitled "Cone twin-screw machine barrel combination device" discloses a Cone twin-screw machine barrel combination device, which comprises a Cone twin-screw machine barrel and a screw, wherein the inner wall of a first section of machine barrel from a feed inlet to the right end opening of the first section of machine barrel is a nitriding layer formed after nitriding treatment, a first refining steel sleeve penetrating through the second section of machine barrel is arranged on the inner wall of the second section of machine barrel, a second refining steel sleeve penetrating through the third section of machine barrel is arranged on the inner wall of the third section of machine barrel, the right opening diameter of the nitriding layer is the same as the left opening diameter of the first refining steel sleeve, the right opening diameter of the first refining steel sleeve is the same as the left opening diameter of the second refining steel sleeve, and a surface alloy layer is arranged on the outer surface of the screw corresponding to the Cone twin-screw between the feed inlet and a discharge outlet. The utility model has the advantages that: the cooperation position of the cone double machine barrel and the screw rod is provided with a reinforcing structure, so that the combined device has good wear resistance and corrosion resistance, can treat corrosive plastics for a long time, and has long service life. However, the screw width of the screw rib of the discharge section of the screw adopted in the combined device is not changed, so that the thrust of the material at the discharge end is insufficient, the discharge effect is not ideal, and the structure of the screw of the combined device is further improved.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a conical extrusion molding screw with good pushing effect and smooth discharging aiming at the current state of the art.

The technical scheme adopted for solving the technical problems is as follows: this toper extrusion molding screw rod, including two conical screw rods, the structure of two screw rods is the same, and arbitrary screw rod includes the body of rod and sets up the spiral shell arris on the body of rod, and the spiral shell arris of arbitrary screw rod stretches into in the spiral shell arris clearance of another screw rod, stretches into the spiral shell arris and corresponds and leave the processing clearance of extrusion material between another screw rod surface, spiral shell arris includes feeding section, melting section and ejection of compact section, its characterized in that: the discharging section is a triple-screw rib, the discharging section comprises a discharging section, a discharging section II and a discharging section III, the screw rib width of the discharging section I is larger than that of the discharging section III, the screw rib width of the discharging section III is larger than that of the discharging section II, and the screw rib interval of the discharging section II is not larger than that of the discharging section III.

As an improvement, the screw pitch of the third discharge section can preferably be greater than the screw pitch of the second discharge section.

Further improvements may be made in that the pitch of the flights of one section of the discharge is preferably greater than the pitch of the flights of three sections of the discharge.

As an improvement, the normal cross sections of the discharging sections can be preferably trapezoid structures with large root widths and small top widths, and the normal cross section included angle of the discharging second section and the normal cross section included angle of the discharging third section are larger than the normal cross section included angle of the discharging first section.

Further improved, the included angle of the normal cross section of the discharging second section can be preferably the same as the included angle of the normal cross section of the discharging third section.

As an improvement, the feeding section may preferably include a first feeding section, a second feeding section and a third feeding section, in which the pitch of the flights decreases in sequence and the widths of the flights decrease in sequence.

Further improvements may be preferred in which the surface of the feed section two to the discharge section is covered with an alloy layer.

As an improvement, the melting section may preferably include a first melting section, a second melting section, and a third melting section, the pitch of the flights of the first melting section, the second melting section, and the third melting section being sequentially increased and the widths of the flights being sequentially increased.

Further improvements may be obtained in that the melting section is preferably circumferentially provided with spiral grooves.

As a modification, a nitriding layer may be preferably provided on the surface of the screw, and the thickness of the nitriding layer is 0.4 to 0.7mm.

Compared with the prior art, the utility model has the advantages that: the screw width of the discharge section screw edge adopts the change, along with the increase of the screw width, the screw rod in the corresponding position can discharge larger volume of materials, the first discharge section can push the molten materials to the second discharge section faster, the second discharge section changes the flow velocity of the materials to play a role of a reservoir, the materials are compacted tightly at the second discharge section, the feeding of the third discharge section is sufficient, and the smooth discharge of the screw rod is realized.

Drawings

FIG. 1 is a front elevation view of one of the screws employed in an embodiment of the present utility model;

FIG. 2 is a cross-sectional view taken along line E-E of FIG. 1;

FIG. 3 is a normal cross-sectional view of the outfeed section of FIG. 1;

FIG. 4 is a normal cross-sectional view of the outfeed section of FIG. 1;

fig. 5 is a normal cross-sectional view of the outfeed three section of fig. 1.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

As shown in fig. 1 to 5, the conical extrusion screw of this embodiment includes two conical screws, the two screws have the same structure, any screw includes a rod body 1 and a screw rib 2 disposed on the rod body 1, the screw rib 2 of any screw extends into the screw rib gap of another screw, and a processing gap for extruding materials is left between the extending screw rib 2 and the outer surface of the corresponding other screw. The surface of the screw is provided with a nitriding layer, and the thickness of the nitriding layer is 0.4-0.7 mm.

The screw edge 2 comprises a feeding section A, a melting section B and a discharging section C, wherein the discharging section C is a triple screw edge, the discharging section C comprises a discharging section C1, a discharging section C2 and a discharging section C3, the screw edge width K1 of the discharging section is larger than the screw edge width K3 of the discharging section, the screw edge width K3 of the discharging section is larger than the screw edge width K2 of the discharging section, and the screw edge distance T2 of the discharging section is not larger than the screw edge distance T3 of the discharging section. The screw pitch T3 of the third discharge section is larger than the screw pitch T2 of the second discharge section. The screw pitch T1 of the first discharge section is larger than the screw pitch T3 of the third discharge section. The normal cross section of the discharging section C is of a trapezoid structure with large root width and small top width, and the normal cross section included angle a2 of the discharging second section and the normal cross section included angle a3 of the discharging third section are both larger than the normal cross section included angle a1 of the discharging first section. The normal section included angle a2 of the second discharging section and the normal section included angle a3 of the third discharging section are the same in size.

The feeding section comprises a first feeding section A1, a second feeding section A2 and a third feeding section A3, the screw pitch of the first feeding section A1, the second feeding section A2 and the third feeding section A3 is sequentially reduced, and the screw width is also sequentially reduced. The surface from the feeding section II to the discharging section is covered with an alloy layer D.

The melting section comprises a first melting section B1, a second melting section B2 and a third melting section B3, the screw pitch of the first melting section B1, the second melting section B2 and the third melting section B3 is sequentially increased, and the screw width is also sequentially increased. Spiral grooves 21 are circumferentially distributed on the melting section B2.

Claims (10)

1. The utility model provides a toper extrusion molding screw rod, includes two conical screw rods, and the structure of two screw rods is the same, and arbitrary screw rod includes body of rod (1) and sets up screw edge (2) on body of rod (1), and screw edge (2) of arbitrary screw rod stretch into to the screw edge clearance of another screw rod in, leave the processing clearance of extrusion material between the screw edge (2) that stretch into and the corresponding another screw rod surface, screw edge (2) include feeding section (A), melting section (B) and ejection of compact section (C), its characterized in that: the discharging section (C) is a triple-screw rib, the discharging section (C) comprises a discharging section (C1), a discharging section (C2) and a discharging section (C3), the screw rib width (K1) of the discharging section is larger than the screw rib width (K3) of the discharging section, the screw rib width (K3) of the discharging section is larger than the screw rib width (K2) of the discharging section, and the screw rib distance (T2) of the discharging section is not larger than the screw rib distance (T3) of the discharging section.

2. The tapered extrusion screw of claim 1 wherein: the screw pitch (T3) of the discharging three sections is larger than the screw pitch (T2) of the discharging two sections.

3. The tapered extrusion screw of claim 2 wherein: the screw pitch (T1) of one discharge section is larger than the screw pitch (T3) of three discharge sections.

4. A tapered extrusion screw as claimed in any one of claims 1 to 3, wherein: the normal cross section of the discharging section (C) is of a trapezoid structure with large root width and small top width, and the normal cross section included angle (a 2) of the discharging second section and the normal cross section included angle (a 3) of the discharging third section are both larger than the normal cross section included angle (a 1) of the discharging first section.

5. The tapered extrusion screw of claim 4 wherein: the normal section included angle (a 2) of the second discharging section and the normal section included angle (a 3) of the third discharging section are the same in size.

6. A tapered extrusion screw as claimed in any one of claims 1 to 3, wherein: the feeding section comprises a first feeding section (A1), a second feeding section (A2) and a third feeding section (A3), the screw pitch of the first feeding section (A1), the second feeding section (A2) and the third feeding section (A3) is sequentially reduced, and the screw width is also sequentially reduced.

7. The tapered extrusion screw of claim 6 wherein: the surface of the feeding section II to the discharging section is covered with an alloy layer (D).

8. A tapered extrusion screw as claimed in any one of claims 1 to 3, wherein: the melting section comprises a first melting section (B1), a second melting section (B2) and a third melting section (B3), the screw pitch of the first melting section (B1), the second melting section (B2) and the third melting section (B3) is sequentially increased, and the screw width is also sequentially increased.

9. The tapered extrusion screw of claim 8 wherein: spiral grooves (21) are circumferentially distributed on the melting second section (B2).

10. A tapered extrusion screw as claimed in any one of claims 1 to 3, wherein: the surface of the screw is provided with a nitriding layer, and the thickness of the nitriding layer is 0.4-0.7 mm.