CN214982954U

CN214982954U - Special high-speed high-plasticizing screw for main and auxiliary threads PP

Info

Publication number: CN214982954U
Application number: CN202120765594.0U
Authority: CN
Inventors: 沈琪; 杨国林; 郑银强; 姚海峰
Original assignee: Zhoushan Tongda Plastic Machinery Co ltd
Current assignee: Zhoushan Tongda Plastic Machinery Co ltd
Priority date: 2021-04-15
Filing date: 2021-04-15
Publication date: 2021-12-03
Anticipated expiration: 2031-04-15

Abstract

The special high-speed high-plasticization screw rod for the main and auxiliary threads PP comprises a screw rod body, a rod handle, a clamping groove, a straight section, a threaded connection section, a thread groove, a feeding section, a long outer diameter tolerance gradient section, a plasticization section, a metering section 7, a first metering section, a groove, a main screw edge, an auxiliary screw edge, an A groove and a B groove. The utility model has the advantages that: the screw is specially used for a PP foaming injection molding machine, the design of large length-diameter ratio of the screw is innovatively adopted, high-torque and high-speed production can be realized, and the production efficiency is effectively improved; in a screw plasticizing area, a main thread and an auxiliary thread are adopted, the auxiliary thread is designed in a variable pitch mode, an A-shaped groove is gradually changed to the auxiliary thread, and the technical bottleneck of PP foaming injection molding is solved. The plasticizing effect meets the requirement, the product quality is stable, the efficiency is high, the yield is high, the energy consumption is low, the service life is greatly prolonged, the yield is improved compared with that of a common three-section screw, and the energy consumption is reduced under the same yield, so that the plasticizing agent has good economic benefit.

Description

Special high-speed high-plasticizing screw for main and auxiliary threads PP

Technical Field

The utility model relates to a special high-speed high plastify screw rod of major-minor screw thread PP belongs to screw rod technical field.

Background

The foamed PP has excellent mechanical property, thermal stability, high-temperature dimensional stability and degradability and recoverability, and is a green packaging material which is vigorously developed at home and abroad at present. The PP foaming material is usually prepared by methods such as extrusion molding, compression molding and the like, and the PP injection molding foaming molding is rare. At present, a common three-section screw is commonly used in a PP foaming injection molding machine, and the defects of air bubbles in injection molding PP, bending deformation of PP injection molding products, air holes in the surface, material flow marks and the like can be frequently caused during injection molding, so that the plasticizing effect cannot meet the requirement, and the product quality is unstable. Therefore, a screw rod specially used for PP foaming injection molding is urgently needed to be developed, so that the production efficiency can be effectively improved, and good economic benefits are achieved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a special high-speed high plastify screw rod of major-minor screw thread PP.

The to-be-solved problem of the utility model is that the ordinary syllogic screw rod of current PP foaming injection moulding machine general use, it has the bubble often to take place to mould plastics PP when injection moulding, and PP injection moulding bending deformation, the defect that the surface has gas pocket, stream material trace.

For realizing the purpose of the utility model, the utility model adopts the technical proposal that:

the special high-speed high-plasticization screw rod of major-minor screw thread PP includes screw rod body, pole handle, draw-in groove, straight section, threaded connection section, thread groove, adds the material section, long external diameter tolerance gradual change section, plastify section, measurement section, first measurement section, ditch groove section, slot, main spiral shell arris, vice spiral shell arris, A groove and B groove, characterized by: the screw rod body sequentially comprises a rod handle, a straight section, a threaded connection section, a feeding section, a plasticizing section and a metering section, wherein a plurality of clamping grooves are axially and uniformly distributed on the outer wall of the rod handle, the tail end of the rod handle is in smooth transition connection with the straight section, the tail end of the straight section is connected with the threaded connection section, threaded grooves are obliquely and uniformly distributed on the outer wall of the threaded connection section, the tail end of the threaded connection section is connected with the feeding section, a long outer diameter tolerance gradual change section is arranged on the feeding section, the tail end of the long outer diameter tolerance gradual change section is connected with the plasticizing section, the tail end of the plasticizing section is connected with a first metering section, the tail end of the first metering section is connected with a groove section, a plurality of groups of grooves are obliquely and uniformly distributed on the outer wall of the groove section, main screw ridges are arranged on the long outer diameter tolerance gradual change section, the plasticizing section and the first metering section, the screw pitch of the main screw ridge is W, the height of the screw ridge is H, the width of the screw ridge is L, the front angle of the main screw ridge is alpha, and auxiliary screw ridges are arranged between adjacent main screw ridges of the plasticizing section, the pitch of the auxiliary screw edge is W ', the height of the screw edge is H ', the width of the screw edge is L ', a groove A is formed between the auxiliary screw edge and the main screw edge in the same side direction of the metering section, and a groove B is formed between the auxiliary screw edge and the main screw edge in the same side direction of the feeding section.

Furthermore, the screw body is made of 42CrMo alloy material, the surface of the screw body is coated with alloy, the surface hardness is more than or equal to HV900, the alloy thickness is more than or equal to 1.5mm, and the bending strength is as follows: more than or equal to 1100MPa, high temperature resistance: not less than 600 ℃.

Further, the screw body is of a structure with a large length-diameter ratio, and the long outer diameter tolerance on the long outer diameter tolerance gradual change section is gradually changed; the bottom diameter of the screw of the first metering section is slightly larger than that of the screw of the long outer diameter tolerance gradual change section; the first metering section and the long outer diameter tolerance transition section are of equidistant equal-depth screw rod structures.

Furthermore, the main screw edge is of an equidistant equal-depth structure, and the auxiliary screw edge is of a variable-pitch structure; the height H of the main screw ridge is greater than the height H 'of the auxiliary screw ridge, and the width L of the main screw ridge is greater than the width L' of the auxiliary screw ridge; the height H of the main screw edge is equal to the screw pitch W.

Further, the front angle alpha of the main screw edge on the feeding section is 5 degrees.

Furthermore, the surface roughness Ra of the main spiral edge and the auxiliary spiral edge is less than or equal to 0.8.

Furthermore, the secondary screw ridge at the tail end of the plasticizing section is gradually deepened to be as deep as the metering section, and the groove A is gradually shallowed to be as high as the secondary screw ridge.

Further, the depth of the groove A is greater than that of the groove B.

The utility model has the advantages that: the screw is specially used for a PP foaming injection molding machine, the design of large length-diameter ratio of the screw is innovatively adopted, high-torque and high-speed production can be realized, and the production efficiency is effectively improved; in a screw plasticizing area, a main thread and an auxiliary thread are adopted, the auxiliary thread is designed in a variable pitch mode, an A-shaped groove is gradually changed to the auxiliary thread, and the technical bottleneck of PP foaming injection molding is solved. The plasticizing effect meets the requirement, the product quality is stable, the efficiency is high, the yield is high, the energy consumption is low, the service life is greatly prolonged, the yield is improved compared with that of a common three-section screw, and the energy consumption is reduced under the same yield, so that the plasticizing agent has good economic benefit.

Drawings

FIG. 1 is a schematic structural diagram of a high-speed high-plasticizing screw special for a main thread and an auxiliary thread PP;

FIG. 2 is a schematic sectional view of a shank B-B of a high-speed and high-plasticizing screw dedicated for the main and auxiliary threads PP;

FIG. 3 is a schematic sectional view of a thread connecting section K-K of a high-speed high-plasticizing screw dedicated for the main and auxiliary threads PP;

FIG. 4 is a schematic structural diagram of a main screw ridge of a high-speed high-plasticizing screw special for a main screw thread and an auxiliary screw thread PP;

FIG. 5 is a schematic sectional view of grooves A and grooves B N-N of a high-speed and high-plasticization screw dedicated for the main and auxiliary screw threads PP;

FIG. 6 is a schematic sectional view of a groove C-C of a high-speed and high-plasticizing screw dedicated for the main and auxiliary screw threads PP;

FIG. 7 is a schematic sectional view of a groove section M-M of a high-speed and high-plasticizing screw dedicated for the main and auxiliary screw threads PP;

in the figure: 1. the screw comprises a screw body 2, a rod handle 21, a clamping groove 3, a straight section 4, a threaded connection section 41, a threaded groove 5, a feeding section 51, a long outer diameter tolerance gradient section 6, a plasticizing section 7, a metering section 71, a first metering section 72, a groove section 721, a groove 8, a main screw ridge 9, an auxiliary screw ridge 10, a groove A11 and a groove B.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

The special high-speed high-plasticization screw rod for the main and auxiliary threads PP comprises a screw rod body 1, a rod handle 2, clamping grooves 21, a straight section 3, a threaded connection section 4, a threaded groove 41, a feeding section 5, a long outer diameter tolerance gradient section 51, a plasticization section 6, a metering section 7, a first metering section 71, a groove section 72, a groove 721, a main screw ridge 8, an auxiliary screw ridge 9, an A groove 10 and a B groove 11, wherein the screw rod body 1 sequentially comprises the rod handle 2, the straight section 3, the threaded connection section 4, the feeding section 5, the plasticization section 6 and the metering section 7, a plurality of clamping grooves 21 are axially and uniformly distributed on the outer wall of the rod handle 2 for fixed installation, the smooth transition connection at the tail end of the rod handle 2 is provided with the straight section 3 for transition connection, the threaded connection section 4 is connected at the tail end of the straight section 3 for threaded connection, the threaded grooves 41 are obliquely and uniformly distributed on the outer wall of the threaded connection section 4 for threaded connection, the tail end of the threaded connection section 4 is connected with the feeding section 5, the material conveying device is used for conveying materials, a long outer diameter tolerance gradual change section 51 is arranged on a feeding section 5 and is used for conveying materials, the tail end of the long outer diameter tolerance gradual change section 51 is connected with a plasticizing section 6 and is used for compressing and mixing the materials, the tail end of the plasticizing section 6 is connected with a first metering section 71 and is used for melting and metering the materials, the tail end of the first metering section 71 is connected with a groove section 72 and is used for shunting the materials, a plurality of groups of grooves 721 are obliquely and uniformly distributed on the outer wall of the groove section 72 and are used for shunting the materials, main screw ridges 8 are arranged on the long outer diameter tolerance gradual change section 51, the plasticizing section 6 and the first metering section 71 and are screw rod components, the screw pitch of the main screw ridge 8 is W, the screw ridge height is H, the screw ridge width is L, the front angle of the main screw ridge 8 is alpha, auxiliary screw ridges 9 are arranged between adjacent main screw ridges 8 of the plasticizing section 6 and are used for separating solid plastics and molten plastics, the screw pitch of the auxiliary screw ridges 9 is W ', the screw ridge height is H', the screw ridge width is L', an A groove 10 is formed between the auxiliary screw ridge 9 and the main screw ridge 8 in the same side direction of the metering section 7 and is used for separating solid plastic and molten plastic, and a B groove 11 is formed between the auxiliary screw ridge 9 and the main screw ridge 8 in the same side direction of the feeding section 5 and is used for separating the solid plastic and the molten plastic.

Furthermore, the screw body 1 is made of 42CrMo alloy material, the surface of the screw body adopts an alloy coating process, the surface hardness is more than or equal to HV900, the alloy thickness is more than or equal to 1.5mm, and the bending strength is as follows: more than or equal to 1100MPa, high temperature resistance: not less than 600 ℃.

Further, the screw body 1 is of a structure with a large length-diameter ratio, and the tolerance of the long outer diameter on the long outer diameter tolerance gradual change section 51 is gradually changed; the screw bottom diameter of the first metering section 71 is slightly larger than that of the long outer diameter tolerance gradual change section 51; the first metering section 71 and the long outer diameter tolerance transition section 51 are of an equidistant equal depth screw configuration.

Further, the main screw edge 8 is of an equidistant and equal-depth structure, and the auxiliary screw edge 9 is of a variable-pitch structure; the height H of the main screw edge 8 is greater than the height H 'of the secondary screw edge 9, and the width L of the main screw edge 8 is greater than the width L' of the secondary screw edge 9; the height H of the main flight 8 is equal to the pitch W.

Further, the front angle alpha of the main screw edge 8 on the feeding section 5 is 5 degrees.

Furthermore, the surface roughness Ra of the main spiral rib 8 and the auxiliary spiral rib 9 is less than or equal to 0.8.

Further, the secondary screw ridge 9 at the end of the plasticizing section 6 is gradually deeper to be as deep as the metering section 7, and the groove A10 is gradually shallower to be as high as the secondary screw ridge 9.

Further, the depth of the a groove 10 is greater than that of the B groove 11.

The using method comprises the following steps: adding a PP raw material into a machine barrel of a PP injection foaming forming machine, enabling the material to enter a plasticizing section 6 from a feeding section 5 through the rotation of a screw body 1, enabling grooves A10 and grooves B11 to be distributed at intervals in a plasticizing area due to main and auxiliary threads in the plasticizing section 6, enabling the material to be molten due to the fact that the outer wall of the machine barrel is heated and the plasticizing section 6 has a certain compression ratio, enabling the molten material and the non-molten material to be separated from each other when passing through a plurality of groups of grooves A10 and grooves B11, enabling the molten material to pass through the plasticizing section 6 and then enter a first metering section 71, finally enter a groove section 72, enabling the material to be divided and converged for multiple times through a plurality of groups of grooves 721, enabling the flow direction of the material to be changed, and enabling melt components to be homogenized with temperature; and finally, by means of the thrust of the screw body 1, injecting the plasticized material in a molten state into a closed die cavity, and solidifying and shaping to obtain the product.

Claims

1. Special high-speed high plastify screw rod of major-minor screw thread PP, including screw rod body (1), lever handle (2), draw-in groove (21), straight section (3), threaded connection section (4), thread groove (41), reinforced section (5), long external diameter tolerance gradual change section (51), plastify section (6), measurement section (7), first measurement section (71), ditch groove section (72), slot (721), main spiral shell arris (8), vice spiral shell arris (9), A groove (10) and B groove (11), characterized by: the screw rod body (1) sequentially comprises a rod handle (2), a straight section (3), a threaded connection section (4), a feeding section (5), a plasticizing section (6) and a metering section (7), wherein a plurality of clamping grooves (21) are axially and uniformly distributed on the outer wall of the rod handle (2), the tail end of the rod handle (2) is in smooth transitional connection with the straight section (3), the tail end of the straight section (3) is connected with the threaded connection section (4), threaded grooves (41) are obliquely and uniformly distributed on the outer wall of the threaded connection section (4), the tail end of the threaded connection section (4) is connected with the feeding section (5), a long outer diameter tolerance gradual change section (51) is arranged on the feeding section (5), the tail end of the long outer diameter tolerance gradual change section (51) is connected with the plasticizing section (6), the tail end of the plasticizing section (6) is connected with a first metering section (71), the tail end of the first metering section (71) is connected with a groove section (72), and a plurality of groups of grooves (721) are obliquely and uniformly distributed on the outer wall of the groove section (72), the long outer diameter tolerance gradual change section (51), the plasticizing section (6) and the first metering section (71) are provided with main screw ridges (8), the screw pitch of the main screw ridges (8) is W, the screw ridge height is H, the screw ridge width is L, the front angle of the main screw ridges (8) is alpha, auxiliary screw ridges (9) are arranged between adjacent main screw ridges (8) of the plasticizing section (6), the screw pitch of the auxiliary screw ridges (9) is W ', the screw ridge height is H ', the screw ridge width is L ', an A groove (10) is formed between the auxiliary screw ridges (9) and the main screw ridges (8) in the same side direction of the metering section (7), and a B groove (11) is formed between the auxiliary screw ridges (9) and the main screw ridges (8) in the same side direction of the feeding section (5).

2. The high-speed and high-plasticization screw rod special for the main and auxiliary threads PP according to claim 1, is characterized in that: the screw body (1) is made of 42CrMo alloy material, the surface of the screw body adopts an alloy coating process, the surface hardness is more than or equal to HV900, the alloy thickness is more than or equal to 1.5mm, and the bending strength is as follows: more than or equal to 1100MPa, high temperature resistance: not less than 600 ℃.

3. The high-speed and high-plasticization screw rod special for the main and auxiliary threads PP according to claim 1, is characterized in that: the screw body (1) is of a structure with a large length-diameter ratio, and the tolerance of the long outer diameter on the long outer diameter tolerance gradual change section (51) is gradually changed; the screw bottom diameter of the first metering section (71) is slightly larger than that of the long outer diameter tolerance gradual change section (51); the first metering section (71) and the long outer diameter tolerance transition section (51) are of an equidistant and equal-depth screw structure.

4. The high-speed and high-plasticization screw rod special for the main and auxiliary threads PP according to claim 1, is characterized in that: the main screw ridge (8) is of an equidistant and equal-depth structure, and the auxiliary screw ridge (9) is of a variable-pitch structure; the height H of the main screw edge (8) is greater than the height H 'of the auxiliary screw edge (9), and the width L of the main screw edge (8) is greater than the width L' of the auxiliary screw edge (9); the height H of the main screw edge (8) is equal to the screw pitch W.

5. The high-speed and high-plasticization screw rod special for the main and auxiliary threads PP according to claim 1, is characterized in that: the front angle alpha of the main screw edge (8) on the feeding section (5) is 5 degrees.

6. The high-speed and high-plasticization screw rod special for the main and auxiliary threads PP according to claim 1, is characterized in that: the surface roughness Ra of the main screw edge (8) and the auxiliary screw edge (9) is less than or equal to 0.8.

7. The high-speed and high-plasticization screw rod special for the main and auxiliary threads PP according to claim 1, is characterized in that: the secondary screw ridge (9) at the tail end of the plasticizing section (6) is gradually deepened to be as deep as the metering section (7), and the groove A (10) is gradually shallowed to be as high as the secondary screw ridge (9).

8. The high-speed and high-plasticization screw rod special for the main and auxiliary threads PP according to claim 1, is characterized in that: the depth of the groove A (10) is greater than that of the groove B (11).