Extrusion structure for a terpene resin pelletizer

Abstract

The utility model relates to the technical field of plastic processing equipment, and specifically discloses an extrusion structure of a terpene resin granulator, which comprises a support, a machine barrel, a driving device, a feeding hopper, a granulating assembly and an extrusion screw, one end of the extrusion screw is coaxially fixedly connected with the output end of the driving device; the extrusion screw comprises at least three helical sections with different pitches, the pitch of the helical sections gradually decreases from the feeding end to the discharging end; the machine barrel is provided with a plurality of heating zones with independent temperature control along the length direction; the granulating assembly comprises a die holder connected with the flange of the machine barrel and a die plate arranged between the die holder and the machine barrel; the utility model is integrally designed through gradient plasticization, accurate temperature control and synchronous granulation, effectively solves the problems of uneven plasticization of terpene resin, large particle size deviation caused by asynchronous granulation and the like in the prior art, and significantly improves the production efficiency and product quality.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing equipment technology, and specifically discloses an extrusion structure for a terpene resin granulator. Background Technology

[0002] Terpene resins, as thermoplastic resins, require extrusion to melt, plasticize, and shape during granulation. The structural design and temperature control of the extrusion screw directly affect the uniformity of resin melting, while the rationality of the pelletizing assembly determines the consistency of particle size. Existing granulation equipment has significant shortcomings: Firstly, Chinese utility model patent with publication number CN220196841U discloses a phenolic resin heating granulation head for coated sand. It adopts a single spiral pusher structure and the heating or cooling is controlled as a whole. It does not design a segmented pitch and independent temperature control structure for the melting characteristics of terpene resin, which makes it easy for the resin to have uneven melting, local overheating or insufficient plasticization during the extrusion process, thus affecting the stability of extrusion pressure and the final particle forming quality. Secondly, the pelletizing components of existing pelletizing equipment mostly adopt a single-blade or double-blade structure (such as the rotary cutter in the aforementioned patent). During the cutting process, the force is concentrated, which easily leads to uneven wear of the blades and makes it difficult to guarantee the fit with the discharge hole, resulting in large particle size deviations, stringing and sticking, etc., which seriously affect the product qualification rate.

[0003] In summary, the extrusion structure of existing resin granulators is insufficient in terms of adaptability to terpene resins and lacks an integrated design that takes into account both gradient plasticization and uniform pelletizing. There is an urgent need for an extrusion structure that can solve the above defects. Utility Model Content

[0004] This invention proposes an extrusion structure for a terpene resin granulator. Through the integrated design of gradient plasticization and uniform pelletizing, it effectively improves the product quality, production stability, and equipment durability of terpene resin granulation, while reducing production costs.

[0005] This utility model is implemented as follows: an extrusion structure for a terpene resin granulator includes a support, a barrel fixed to the top of the support, a drive device located at one end of the barrel, a feed hopper connected to the side wall of the barrel and close to the drive device, a pelletizing assembly located at the end of the barrel away from the drive device, and an extrusion screw passing through the barrel, one end of the extrusion screw being coaxially and fixedly connected to the output end of the drive device; characterized in that: the extrusion screw includes at least three helical sections with different pitches, the pitch of the helical sections gradually decreasing from the feed end to the discharge end; the barrel along its length... The device has multiple independently temperature-controlled heating zones. The pelletizing assembly includes a die base connected to the barrel flange, a template disposed between the die base and the barrel, and a blade holder disposed outside the die base. The blade holder includes an annular cutter disc and at least three blades arranged in an array on the outer wall of the annular cutter disc. The blades are in contact with the template surface. The end of the extrusion screw passes through the template and the annular cutter disc in sequence, and the end of the extrusion screw is provided with a keyway. The inner wall of the annular cutter disc is provided with a key bar that cooperates with the keyway. The end of the extrusion screw is locked by a nut, thereby driving the annular cutter disc to rotate synchronously.

[0006] As a preferred extrusion structure of the terpene resin granulator of this utility model, the spiral section includes a feeding section, a compression section and an extrusion section, the pitch of the feeding section is 8-12mm and the pitch of the extrusion section is 4-6mm.

[0007] In a preferred embodiment of the extrusion structure of a terpene resin granulator according to the present invention, each heating zone includes a resistance heater and a temperature sensor, wherein the temperature sensor is a thermocouple.

[0008] As a preferred extrusion structure of the terpene resin granulator of this utility model, the outer wall of the barrel is provided with a cooling device, which is an annular water-cooled jacket, sleeved on the outer wall of the barrel and distributed at intervals with the heating zone.

[0009] In a preferred embodiment of the extrusion structure of the terpene resin granulator of this utility model, the driving device is a variable frequency motor, which is connected to the extrusion screw via a coupling.

[0010] As a preferred extrusion structure of the terpene resin granulator of this utility model, the inner wall of the barrel is coated with a tungsten carbide wear-resistant coating.

[0011] As a preferred extrusion structure of the terpene resin granulator of this utility model, the surface of the spiral part is provided with a polytetrafluoroethylene anti-stick coating.

[0012] As a preferred extrusion structure of the terpene resin granulator of this utility model, the template is a porous template with a pore diameter of 1-3 mm and a pore spacing of 2-4 mm.

[0013] The beneficial effects of this utility model are: 1. The multi-stage variable pitch extrusion screw, combined with an independent temperature-controlled heating zone, achieves gradient plasticization of terpene resin, solving the problems of uneven melting, local overheating, or insufficient plasticization in traditional equipment, and improving the quality of resin plasticization and the stability of extrusion pressure.

[0014] 2. The annular cutter array is equipped with at least three blades, which are connected by a key and rotate synchronously with the extrusion screw. This results in more uniform cutting force and a higher degree of contact between the blades and the template, effectively solving the problems of large particle size deviation and stringing caused by single / double blade cutting, and significantly improving particle uniformity and product qualification rate.

[0015] 3. The variable frequency motor can flexibly adjust the screw speed to adapt to different production needs, and the water-cooled jacket enables precise temperature control, further ensuring product quality stability.

[0016] 4. The design of tungsten carbide wear-resistant coating and polytetrafluoroethylene anti-stick coating extends the service life of the equipment, reduces material residue, and lowers the equipment maintenance cost and cleaning difficulty. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the mold base and template of this utility model.

[0020] Figure 3 This is a schematic diagram of the structure of the annular cutter head, blade, keyway, and key bar of this utility model.

[0021] Figure 4 This is a schematic diagram of the structure of the barrel and the tungsten carbide wear-resistant coating of this utility model.

[0022] Figure 5 This is a schematic diagram of the extrusion screw and polytetrafluoroethylene anti-stick coating of this utility model.

[0023] The markings in the diagram are: 1. Support; 2. Barrel; 3. Drive unit; 4. Feed hopper; 5. Pelletizing assembly; 6. Extrusion screw; 7. Die base; 8. Template; 9. Annular cutter head; 10. Blade; 11. Keyway; 12. Key bar; 13. Nut; 14. Feeding section; 15. Compression section; 16. Extrusion section; 17. Resistance heater; 18. Temperature sensor; 19. Cooling device; 20. Tungsten carbide wear-resistant coating; 21. Polytetrafluoroethylene anti-stick coating. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0025] Please see Figure 1-5 An extrusion structure for a terpene resin granulator includes a support 1, a barrel 2 fixed to the top of the support 1, a drive device 3 located at one end of the barrel 2, a feed hopper 4 connected to the side wall of the barrel 2 and close to the drive device 3, a pelletizing assembly 5 located at the end of the barrel 2 away from the drive device 3, and an extrusion screw 6 passing through the barrel 2. One end of the extrusion screw 6 is coaxially and fixedly connected to the output end of the drive device 3. The extrusion screw 6 includes at least three helical sections with different pitches, the pitch of which gradually decreases from the feed end to the discharge end. The barrel 2 has multiple independently temperature-controlled heating elements distributed along its length. Hot zone; Pelletizing assembly 5 includes a die base 7 connected to the flange of the barrel 2, a template 8 disposed between the die base 7 and the barrel 2, and a cutter holder disposed outside the die base 7. The cutter holder includes an annular cutter disc 9 and at least three blades 10 arrayed on the outer wall of the annular cutter disc 9. The blades 10 are in contact with the surface of the template 8. The end of the extrusion screw 6 passes through the template 8 and the annular cutter disc 9 in sequence, and the end of the extrusion screw 6 is provided with a keyway 11. The inner wall of the annular cutter disc 9 is provided with a key bar 12 that cooperates with the keyway 11. The end of the extrusion screw 6 is locked by a nut 13, thereby driving the annular cutter disc 9 to rotate synchronously.

[0026] In this embodiment: the drive device 3 is started, driving the extrusion screw 6 to rotate, and the terpene resin raw material enters the barrel 2 from the feed hopper 4; under the synergistic effect of multiple independent temperature-controlled heating zones distributed along the length of the barrel 2, the resin is gradually heated and melted; at the same time, at least three spiral sections on the extrusion screw 6 with the pitch gradually decreasing from the feed end to the discharge end generate a strong shearing effect on the molten resin and make it undergo the process of conveying, compression and homogenization extrusion, thereby obtaining a plasticized and pressure-stable melt; subsequently, the melt is extruded into strips through the template 8. At this time, the end of the extrusion screw 6 locked by the nut 13 cooperates with the key strip 12 on the inner wall of the annular cutter disc 9 through the keyway 11 on it, directly driving the annular cutter disc 9 equipped with multiple blades 10 to rotate synchronously at high speed with the screw, so that the blades 10 close to the surface of the template 8 accurately and synchronously cut the extruded resin strip into particles with uniform particle size. It should be noted that the key bar 12 and the annular cutter head 9 are integrally formed structures.

[0027] As a technical optimization of this utility model, the spiral section includes a feeding section 14, a compression section 15 and an extrusion section 16. The pitch of the feeding section 14 is 8-12mm and the pitch of the extrusion section 16 is 4-6mm.

[0028] In this embodiment, the specific pitch range of each section of the spiral can accurately adapt to the gradient plasticization requirements of terpene resin from feeding, compression to extrusion, further improving melt uniformity and extrusion pressure stability, and providing an executable standard for structural parameters.

[0029] As a technical optimization of this utility model, each heating zone includes a resistance heater 17 and a temperature sensor 18, wherein the temperature sensor 18 is a thermocouple.

[0030] In this embodiment: the thermocouple temperature sensor 18 ensures accurate temperature detection, the resistance heater 17 achieves stable heating, ensures the reliability of the independent temperature control function, and avoids resin plasticization defects caused by temperature fluctuations.

[0031] As a technical optimization of this utility model, the outer wall of the barrel 2 is provided with a cooling device 19, which is an annular water-cooled jacket, sleeved on the outer wall of the barrel 2 and distributed at intervals with the heating zone.

[0032] In this embodiment: by adding a water-cooled jacket cooling device 19, the temperature can be quickly reduced when the heating zone is overheated or the resin is locally overheated, thus balancing the temperature of the barrel 2, preventing the terpene resin from degrading due to high temperature, and improving the stability of product quality.

[0033] As a technical optimization of this utility model, the drive device 3 is a variable frequency motor, which is connected to the extrusion screw 6 through a coupling.

[0034] In this embodiment, a variable frequency motor and coupling are used to drive the screw, enabling stepless adjustment of the screw speed to adapt to different production volumes and resin melting states. At the same time, the coupling reduces transmission shock, protects the screw and motor, and extends the service life of the equipment.

[0035] As a technical optimization of this utility model, the inner wall of the barrel 2 is coated with a tungsten carbide wear-resistant coating 20.

[0036] In this embodiment, the inner wall of the barrel 2 is coated with a tungsten carbide wear-resistant coating 20 to enhance the wear resistance of the barrel 2, reduce the wear on the barrel wall during resin extrusion, extend the equipment maintenance cycle, and reduce the operating cost.

[0037] As a technical optimization of this utility model, the surface of the spiral part is provided with a polytetrafluoroethylene anti-stick coating 21.

[0038] In this embodiment, a polytetrafluoroethylene anti-stick coating 21 is provided on the surface of the spiral section to prevent the terpene resin from adhering to the screw after melting, ensuring the continuity of feeding, conveying and extrusion, and reducing cleaning problems and product contamination caused by material residue.

[0039] As a technical optimization of this utility model, template 8 is a multi-hole template with a hole diameter of 1-3mm and a hole spacing of 2-4mm.

[0040] In this embodiment, the aperture and spacing parameters of the template 8, in conjunction with the multi-blade pelletizing structure, further ensure the consistency of particle size, while the reasonable spacing of the holes avoids particle adhesion and improves the granulation qualification rate.

[0041] Working principle and usage process of this utility model: Terpene resin raw material is fed into the barrel 2 from the feed hopper 4 near the drive unit 3. Multiple independently temperature-controlled heating zones on the barrel 2 are set to different temperatures according to process requirements to provide gradient heating for the resin. At the same time, the extrusion screw 6, driven by the drive unit 3 (such as a variable frequency motor) through a coupling, begins to rotate. The multi-segment variable pitch spiral section on the screw conveys the material forward, and under the action of compression ratio and shear force generated by the pitch change, the material is fully melted and uniformly plasticized. The water-cooling jacket on the outer wall of the barrel 2 can assist in temperature control when necessary. The uniformly plasticized molten resin is pushed by the end of the extrusion screw 6 and extruded into multiple thin and long resin strips of uniform thickness through the template 8 with small holes. The end of the extrusion screw 6 is directly driven by a key to rotate the annular cutter disc 9 synchronously. Multiple blades 10 on the outer wall of the annular cutter disc 9 rotate at high speed in close contact with the surface of the template 8, instantly cutting the extruded resin strips to form uniformly sized granules. The cut granules are collected to complete the entire granulation process.

[0042] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. An extrusion structure for a terpene resin granulator, comprising a support (1), a barrel (2) fixedly mounted on the top of the support (1), a drive device (3) disposed at one end of the barrel (2), a feed hopper (4) connected to the side wall of the barrel (2) and close to the drive device (3), a pelletizing assembly (5) disposed at the end of the barrel (2) away from the drive device (3), and an extrusion screw (6) passing through the barrel (2), one end of the extrusion screw (6) being coaxially and fixedly connected to the output end of the drive device (3); characterized in that: The extrusion screw (6) includes at least three helical sections with different pitches, the pitch of which gradually decreases from the feed end to the discharge end; the barrel (2) has multiple independently temperature-controlled heating zones distributed along its length; the pelletizing assembly (5) includes a die base (7) connected to the flange of the barrel (2), a template (8) disposed between the die base (7) and the barrel (2), and a cutter holder disposed outside the die base (7), the cutter holder including an annular cutter disc (9) arrayed on the annular cutter disc. At least three blades (10) on the outer wall of the cutter head (9) are attached to the surface of the template (8). The end of the extrusion screw (6) passes through the template (8) and the annular cutter head (9) in sequence. The end of the extrusion screw (6) is provided with a keyway (11). The inner wall of the annular cutter head (9) is provided with a key bar (12) that cooperates with the keyway (11). The end of the extrusion screw (6) is locked by a nut (13), thereby driving the annular cutter head (9) to rotate synchronously.

2. The extrusion structure of a terpene resin granulator according to claim 1, characterized in that: The spiral section includes a feeding section (14), a compression section (15) and an extrusion section (16). The pitch of the feeding section (14) is 8-12 mm, and the pitch of the extrusion section (16) is 4-6 mm.

3. The extrusion structure of a terpene resin granulator according to claim 1, characterized in that: Each of the heating zones includes a resistance heater (17) and a temperature sensor (18), wherein the temperature sensor (18) is a thermocouple.

4. The extrusion structure of a terpene resin granulator according to claim 1, characterized in that: The outer wall of the barrel (2) is provided with a cooling device (19), which is an annular water-cooled jacket, fitted on the outer wall of the barrel (2) and distributed at intervals with the heating zone.

5. The extrusion structure of a terpene resin granulator according to claim 1, characterized in that: The drive device (3) is a variable frequency motor, which is connected to the extrusion screw (6) via a coupling.

6. The extrusion structure of a terpene resin granulator according to claim 1, characterized in that: The inner wall of the barrel (2) is coated with a tungsten carbide wear-resistant coating (20).

7. The extrusion structure of a terpene resin granulator according to claim 1, characterized in that: The surface of the spiral section is provided with a polytetrafluoroethylene anti-stick coating (21).

8. The extrusion structure of a terpene resin granulator according to claim 1, characterized in that: The template (8) is a porous template with a hole diameter of 1-3 mm and a hole spacing of 2-4 mm.

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