JM type screw rod and machine barrel spiral feeding structure for plastic processing

Abstract

The utility model discloses a JM type screw and machine barrel spiral feeding structure for plastic processing, and relates to the technical field of extrusion molding, a transmission shaft is sequentially provided with an average stroke section, a gradual change compression section, a gradual change plasticizing section and an average mixing section along the propelling direction of a shaft rod, the gradual change compression section is of a double-spiral variable-pitch structure, and the gradual change plasticizing section is of a double-spiral variable-pitch structure. And the gradually-changed plasticizing section is of a circumferential spiral staggered structure. According to the designed extrusion screw component, the feeding and mixing uniformity and stability of extrusion molding raw materials are improved through the cooperation of the average stroke section and the feeding spiral on the inner wall of the machine barrel, the compression compactness and plasticization of the extrusion molding raw materials are enhanced through J and M type gradual change channels of the gradual change compression section, and the compression efficiency is improved through J and M type gradual change channels of the gradual change plasticization section. And then stirring and mixing of the uniform mixing section are utilized, so that the extrusion uniformity of the extrusion molding raw materials is improved, the multi-stage screw propulsion extrusion characteristic is achieved, and the plasticizing extrusion stability of the extrusion molding raw materials is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of plastic extrusion, especially to JM type screw rod and machine cylinder helical feeding structure for plastic processing. BACKGROUND

[0002] Plastic extruder is an important equipment for plastic forming, which conducts plastic conveying, compaction, melting, shearing and mixing extrusion molding through external power transmission and heat transfer of external heating elements, and is widely used in pipe, film, automobile parts, packaging and other fields. As an important part of plastic extruder, the extrusion screw determines the quality of plastic extrusion molding. Therefore, with the vigorous development of the plastic industry, the types of extruder screws are increasing. For example, the screw rod and machine cylinder of the rubber machine disclosed by China Patent Network (publication number CN215095515U) have a heat dissipation hole groove inside the screw rod to discharge heat, and then use the threads on the screw rod to complete the helical advancement and extrusion of the plastic along the machine cylinder.

[0003] However, the extrusion screw components adopted by the above-mentioned disclosed patent and existing market still have some deficiencies: most of the existing screw components are single helical structures, and their helical advancement and extrusion performance is relatively single, which is poor for the mixing and plasticizing performance of the extruded raw materials, resulting in uneven quality of the extruded workpieces and poor extrusion quality stability. Therefore, the technical personnel in the field provide JM type screw rod and machine cylinder helical feeding structure for plastic processing to solve the problems raised in the above background technology. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model provides JM type screw rod and machine cylinder helical feeding structure for plastic processing, which solves the problem of poor extrusion quality stability of the extrusion components of the existing extrusion equipment raised in the above background technology.

[0005] To achieve the above purpose, the utility model realizes the following technical scheme: JM type screw rod for plastic processing, including transmission shaft,

[0006] The transmission shaft is sequentially provided with uniform stroke section, gradually changing compression section, gradually changing plasticizing section and uniform mixing section along the advancement direction of the shaft rod;

[0007] The gradually changing compression section is a double helix variable pitch structure;

[0008] The gradually changing plasticizing section is a circumferential helical staggered structure.

[0009] As a further technical scheme of the utility model: the double helix of the gradually changing compression section forms a J-shaped channel, and each group of independent helix of the gradually changing compression section forms an M-shaped channel.

[0010] As a further technical scheme of the utility model: each group of circumferential spiral of the gradually changing plasticizing section is J-shaped channel, and M-shaped channel is formed between the two adjacent groups of circumferential spiral.

[0011] As a further technical scheme of the utility model: the spiral of the uniform-amount travel section and the gear ring of the uniform-amount mixing section are arranged at equal intervals along the shaft rod direction of the transmission shaft.

[0012] The machine cylinder spiral feeding structure for plastic processing comprises a machine cylinder, and a JM-type screw rod is arranged in the machine cylinder.

[0013] As a further technical scheme of the utility model: the machine cylinder comprises a melting cylinder body, a feeding cylinder body and a flange seat connected integrally, and the melting cylinder body and the feeding cylinder body and the feeding cylinder body and the flange seat are connected by bolts.

[0014] As a further technical scheme of the utility model: the inner wall of the feeding cylinder body is provided with a feeding spiral along the feeding opening direction thereof.

[0015] The utility model provides JM-type screw rod and machine cylinder spiral feeding structure for plastic processing, and has the following beneficial effects compared with prior art:

[0016] The extrusion screw part of the design is based on the transmission shaft as the driving source, drives the combined linkage operation of the uniform-amount travel section, the gradually changing compression section, the gradually changing plasticizing section and the uniform-amount mixing section, improves the feeding and mixing uniformity and stability of the extrusion raw material by the cooperation of the uniform-amount travel section and the feeding spiral of the inner wall of the machine cylinder, strengthens the compression compactness and plasticity of the extrusion raw material by the J and M type gradually changing channels of the gradually changing compression section, further strengthens the extrusion plasticity of the extrusion raw material by the J and M type gradually changing channels of the gradually changing plasticizing section, and then improves the extrusion uniformity of the extrusion raw material by the stirring and mixing of the uniform-amount mixing section, which has the multi-stage spiral propulsion extrusion characteristics, and the plasticization and extrusion stability of the extrusion raw material is higher, and the quality of the extrusion product is better. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is structure schematic view of JM type screw rod for plastic processing embodiment one;

[0018] Figure 2 It is plane schematic view of JM type screw rod for plastic processing embodiment one;

[0019] Figure 3 It is structure schematic view of gradually changing compression section in JM type screw rod for plastic processing embodiment one;

[0020] Figure 4 It is structure schematic view of gradually changing plasticizing section in JM type screw rod for plastic processing embodiment one;

[0021] Figure 5 Structure diagram of the second embodiment of the JM screw for plastic processing;

[0022] Figure 6 Structure diagram of the screw feeding structure of the cylinder for plastic processing;

[0023] Figure 7 Plan view of the screw feeding structure of the cylinder for plastic processing.

[0024] In the figure: 11, transmission shaft; 12, uniform stroke section; 13, gradually changing compression section; 14, gradually changing plasticizing section; 15, uniform mixing section; 16, first uniform stroke section; 17, tapered compression section; 18, second uniform stroke section; 2, cylinder; 21, smelting cylinder body; 22, feeding cylinder body; 23, flange seat; 24, feeding screw. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. EMBODIMENT

[0026] Please refer to Figures 1-4 The present application provides a JM screw for plastic processing: the JM screw for plastic processing comprises a transmission shaft 11, and the transmission shaft 11 is sequentially provided with a uniform stroke section 12, a gradually changing compression section 13, a gradually changing plasticizing section 14 and a uniform mixing section 15 along the advancing direction of the shaft of the transmission shaft 11. The combination of the uniform stroke section 12, the gradually changing compression section 13, the gradually changing plasticizing section 14 and the uniform mixing section 15 arranged on the transmission shaft 11 has the characteristics of multi-stage screw advancing and extruding, and the plasticizing extrusion stability of the extruded raw material is higher, and the quality of the extruded product is better.

[0027] The gradually changing compression section 13 is a double-spiral variable-pitch structure, and the double spirals of the gradually changing compression section 13 form a J-shaped channel, and each group of independent spirals of the gradually changing compression section 13 forms an M-shaped channel. By arranging the gradually changing compression section 13 as a double-spiral variable structure, the gradually changing compression section 13 has good gradually changing compression and plasticizing characteristics. When the extruded raw material is advanced to the gradually changing compression section 13, the gradually changing compression section 13 utilizes the variable conversion of the J-shaped channel and the M-shaped channel (for reference to the description of the accompanying drawings) to perform variable-pitch compression and advancement on the extruded raw material. On the one hand, the compactness and air bubble-free performance of the extruded raw material are improved, and on the other hand, the plasticizing characteristics of the extruded raw material are improved. Figure 3

[0028] ​The gradual plasticizing section 14 is a circumferential spiral staggered structure, each group of circumferential spirals of the gradual plasticizing section 14 is a J-shaped channel, and an M-shaped channel is formed between two adjacent groups of circumferential spirals, by setting the gradual plasticizing section 14 as a circumferential spiral staggered structure, the gradual plasticizing section 14 has good gradual extrusion and plasticizing performance, the J-shaped channel formed by the channels serves as an inlet groove and an outlet groove, and the M-shaped channel formed between the channels is milled to the outlet groove, so that the extrusion material is gradually compressed and pushed out, so as to improve the plasticizing of the extrusion material (for details, refer to the description and the accompanying Figure 4

[0029] The spirals of the uniform-amount travel section 12 and the gear rings of the uniform-amount mixing section 15 are arranged at equal intervals along the axial direction of the transmission shaft 11, by using the uniform-amount travel of the uniform-amount travel section 12, the extrusion material is stably and spirally pushed forward for feeding, and by using the uniform-amount mixing of the uniform-amount mixing section 15, the extrusion material is stably and mixed for feeding. Embodiment

[0030] Please refer to Figure 5 The utility model provides a JM type screw rod for plastic processing technical scheme: JM type screw rod for plastic processing, including transmission shaft 11, its relative embodiment one different is, transmission shaft 11 along its axial direction of advancement is sequentially provided with first uniform-amount travel section 16, taper compression section 17, second uniform-amount travel section 18, gradual plasticizing section 14, uniform-amount mixing section 15, wherein

[0031] The travel spirals of the first uniform-amount travel section 16 and the second uniform-amount travel section 18 are arranged at equal intervals, and by using the uniform-amount feeding of the first uniform-amount travel section 16 and the second uniform-amount travel section 18, the extrusion material is uniformly and stably pushed forward for feeding.

[0032] The taper spirals of the taper compression section 17 are arranged in a taper expansion along the axial direction of advancement of the transmission shaft 11, and the taper is between 1° and 3°, by using the gradual extrusion of the taper compression section 17, the extrusion material is gradually compressed, so that the spiral advancement of the extrusion material is more compact, the generation of bubbles is reduced, and the fullness of the extrusion material is ensured.

[0033] Please refer to Figures 6-7 The utility model provides a spiral feeding structure of cylinder for plastic processing: spiral feeding structure of cylinder for plastic processing, including cylinder 2, be provided with JM type screw rod in cylinder 2.

[0034] ​The machine barrel 2 comprises a melting barrel body 21, a feeding barrel body 22 and a flange base 23 which are integrally connected, and the melting barrel body 21 and the feeding barrel body 22 and the feeding barrel body 22 and the flange base 23 are fixedly connected through bolts. By setting the melting barrel body 21, the feeding barrel body 22 and the flange base 23 in a disassembled and integrated assembly form, independent production and processing of each component is facilitated, the production and processing intensity is reduced, and disassembled transportation and flexible on-site assembly are facilitated.

[0035] The inner wall of the feeding barrel body 22 is provided with a feeding spiral 24 along the feeding opening direction. The feeding spiral 24 provided on the feeding opening of the machine barrel 2 can be combined with the screw spiral to form a double-spiral pushing and extruding state, improve the feeding stability and the initial feeding plasticity of the extrusion raw material.

[0036] The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled persons in the art, some improvements and refinements can be made without departing from the principle of the utility model, and these improvements and refinements should be regarded as the protection scope of the utility model. The structures, devices and operation methods which are not specifically described and explained in the utility model are implemented according to the conventional means in the art without special description and limitation.

Claims

1. JM type screw for plastic processing, characterized by the fact that, The transmission shaft (11) is sequentially provided with a constant stroke section (12), a gradually changing compression section (13), a gradually changing plasticizing section (14) and a constant mixing section (15) along the axial direction of the transmission shaft (11). The gradually changing compression section (13) is of a double helix variable pitch structure. The gradually changing plasticizing section (14) is of a circumferential helix staggered structure. The double helix of the gradually changing compression section (13) forms a J-shaped channel, and each group of independent helix of the gradually changing compression section (13) forms an M-shaped channel.

2. The JM screw for plastic processing according to claim 1, characterized by, Each group of circumferential helix of the gradually changing plasticizing section (14) is a J-shaped channel, and the two adjacent groups of circumferential helix form an M-shaped channel.

3. The JM screw for plastic processing according to claim 1, wherein The helix of the constant stroke section (12) and the gear ring of the constant mixing section (15) are arranged at equal intervals along the axial direction of the transmission shaft (11).

4. The JM screw for plastic processing according to claim 1, wherein The machine cylinder (2) is provided with the JM type screw rod as claimed in claims 1-4.

5. A machine cylinder screw feeding structure for plastic processing, the JM type screw for plastic processing according to any one of claims 1 to 4, characterized in that, The machine cylinder (2) comprises a melting cylinder body (21), a feeding cylinder body (22) and a flange seat (23) which are connected in one body, and the melting cylinder body (21) and the feeding cylinder body (22) and the flange seat (23) are connected by bolts.

6. The barrel screw feed structure for plastic processing according to claim 5, wherein The inner wall of the feeding cylinder body (22) is provided with a feeding helix (24) along the feeding opening direction.

7. The barrel screw feed structure for plastic processing according to claim 6, characterized by, ​

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