Pelletizer for PP (polypropylene) plastic particles

Abstract

The utility model relates to the technical field of plastic particle production, in particular to a pp (polypropylene) plastic particle granulator, which comprises an extrusion cooling cylinder mounted on a discharge pipe on the left side of the granulator, a cooling forming mechanism is arranged in the extrusion cooling cylinder, and a cutting mechanism is arranged at the left end of the extrusion cooling cylinder. According to the extrusion cooling device, the extrusion pipe is mounted in the extrusion cooling cylinder for cooling, so that the plastic strips are prevented from being pulled into an external water tank for cooling, the plastic strips are prevented from being pulled and deformed, and the uniformity of plastic particles is influenced; the spiral turbulence is formed, the turbulence degree of a flow field is increased, so that heat transfer is more efficient, the cooling efficiency is improved, the cutting motor drives the rotating shaft to rotate, then the cutting blades installed on the cutting disc on the rotating shaft in an array mode are driven to rotate, extruded plastic strips are cut at a constant speed, and the consistency of plastic particles is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of plastic particle production, especially to a pp plastic particle granulator. BACKGROUND

[0002] PP plastic, namely polypropylene, is a kind of semi-crystalline thermoplastic, which has the characteristics of non-toxic, odorless, light weight, wear resistance, antibacterial and easy dyeing, etc., and is usually white waxy solid, small density, high melting point, and has good heat resistance and chemical stability, PP plastic particles in the production process: plastic is plasticized and melted by the plasticizer of the granulator, and is cut into particles by the cutting device after being extruded into a strip or a belt shape through a die hole.

[0003] However, after the plastic raw material is extruded into a strip shape by the granulator, the strip-shaped plastic is usually pulled into a water tank for cooling, but the pulling force will cause the strip-shaped plastic to deform during the pulling process, affecting the particle uniformity, and the plastic particle uniformity will directly affect the physical and mechanical properties of the subsequent plastic products, and the water tank cooling will continuously consume water resources, and the water used after cooling will also cause environmental pollution after being discharged. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model provides a pp plastic particle granulator, which solves the technical problem that the strip-shaped plastic is deformed when being pulled into a water tank for cooling in the prior art, and improves the uniformity of the plastic particles.

[0005] To solve the above technical problems, the utility model provides the following technical scheme: a pp plastic particle granulator, which comprises an extrusion cooling cylinder mounted on a discharge pipe on the left side of the granulator, a cooling and forming mechanism for cooling and forming the strip-shaped plastic is arranged in the extrusion cooling cylinder, and a cutting mechanism for cutting and granulating the strip-shaped plastic is arranged at the left end of the extrusion cooling cylinder.

[0006] The cooling and forming mechanism comprises an extrusion pipe installed in the extrusion cooling cylinder in a ring array, a liquid storage tank is installed below the extrusion cooling cylinder, a water pump is installed on the liquid storage tank, a liquid outlet of the water pump is provided with a liquid delivery pipe extending into the extrusion cooling cylinder, and a reflux pipe extending into the liquid storage tank is installed at the bottom left side of the extrusion cooling cylinder.

[0007] Further improvement lies in that the interior of the extrusion cooling cylinder is a hollow structure, and a spiral auger is installed in the interior.

[0008] Further improvement lies in that a refrigerator is installed on the back of the liquid storage tank, heat dissipation fins are arrayed on the reflux pipe, and heat dissipation holes are formed through the heat dissipation fins.

[0009] Further improvement lies in that the bottom of the extrusion cooling cylinder is symmetrically provided with support frames on the left and right sides, and the bottom of each support frame is provided with a placing table, and the infusion pipe and the return pipe both penetrate through the placing table.

[0010] Further improvement lies in that the cutting mechanism comprises a cutting motor installed on the placing table and a bearing seat located on the left side of the cutting motor, the cutting motor is connected with a rotating shaft which is rotatably connected to the bearing seat at the output end, the left end of the rotating shaft is provided with a cutting disc, the outer side of the cutting disc is annularly and arrayed provided with cutting blades, the left side of the placing table is provided with a protective shell which is sleeved on the outer side of the cutting blades through a connecting block, and the left side of the placing table is provided with a screening assembly for screening the plastic particles after cutting and granulating.

[0011] Further improvement lies in that the screening assembly comprises a screening box placed on the left side of the placing table, and the screening box is obliquely provided with a screening mesh plate, the left side surface of the screening box is provided with a box door, and the box door is provided with an observation window made of transparent tempered glass.

[0012] By the above technical scheme, the pp plastic particle granulator has at least the following beneficial effects:

[0013] 1、The extrusion pipe is installed in the extrusion cooling barrel for cooling, so that the plastic strip is not pulled into an external water tank for cooling, and the plastic strip is not deformed in the process, thereby affecting the uniformity of the final plastic particles.

[0014] 2、The spiral auger is installed in the extrusion cooling cylinder, the cooling liquid in the extrusion cooling cylinder flows through the spiral auger to form spiral turbulent flow, the turbulent degree of the flow field is increased, heat transfer is more efficient, and the cooling effect is improved.

[0015] 3、The cutting motor drives the rotating shaft to rotate, and then drives the cutting blades arrayed on the cutting disc on one side of the rotating shaft to rotate, so that the extruded plastic strip is uniformly cut, and the consistency of the plastic particles is ensured.

[0016] 4、The screening mesh plate in the screening box is used for uniformity screening of the plastic particles after cutting and granulating, so that the quality of the plastic particles is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application.

[0018] In the drawings:

[0019] Figure 1 It is a whole structure schematic view of the utility model;

[0020] Figure 2 It is a rear view structure schematic view of the utility model;

[0021] Figure 3 It is a cross section internal structure schematic view of the utility model extrusion cooling cylinder;

[0022] Figure 4 It is a cutting mechanism local enlarged structure schematic view of the utility model;

[0023] Figure 5 It is a screening assembly independent side view structure schematic view of the utility model.

[0024] In the drawing: 1, granulator; 2, extrusion cooling cylinder;

[0025] 3, cooling forming mechanism; 301, extrusion pipe; 302, liquid storage tank; 303, water pump; 304, liquid delivery pipe; 305, return pipe; 306, spiral auger; 307, refrigerator; 308, cooling fin; 309, support frame; 310, placing table;

[0026] 4, cutting mechanism; 401, cutting motor; 402, bearing seat; 403, rotating shaft; 404, cutting disc; 405, cutting blade; 406, protective shell;

[0027] 407, screening assembly; 4071, screening box; 4072, screening mesh plate; 4073, box door; 4074, observation window. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0029] Embodiment 1

[0030] Based on the problem that the existing prior art causes the strip-shaped plastic to deform when being pulled into the sink for cooling, affecting the particle uniformity, the embodiment provides a pp plastic particle granulator, please refer to Figures 1-5The embodiment provides a pp plastic particle granulator which can avoid deformation of the strip-shaped plastic and improve the uniformity of the plastic particles. The pp plastic particle granulator comprises an extrusion cooling cylinder 2 which is arranged on a discharge pipe on the left side of a granulator 1, a cooling and forming mechanism 3 which is arranged in the extrusion cooling cylinder 2 and is used for cooling and forming the strip-shaped plastic, and a cutting mechanism 4 which is arranged at the left end of the extrusion cooling cylinder 2 and is used for cutting and granulating the strip-shaped plastic. The strip-shaped plastic is wrapped in the extrusion cooling cylinder 2 to be cooled and formed through the cooling and forming mechanism 3, so that the strip-shaped plastic does not need to be pulled and cooled through a water tank, the strip-shaped plastic is not deformed in the pulling process, and then the strip-shaped plastic which is cooled and formed is cut and granulated through the cutting mechanism 4.

[0031] The prior art causes the deformation of the strip-shaped plastic when the strip-shaped plastic is pulled into the water tank to be cooled, and the uniformity of the particles is affected, so that the device is provided with the cooling and forming mechanism 3 which comprises an extrusion pipe 301 which is arranged in the extrusion cooling cylinder 2 in a ring array, a liquid storage tank 302 which is arranged below the extrusion cooling cylinder 2, a water pump 303 which is arranged on the liquid storage tank 302, a liquid delivery pipe 304 which is arranged on the water pump 303 and extends into the extrusion cooling cylinder 2, a backflow pipe 305 which is arranged at the bottom left side of the extrusion cooling cylinder 2 and extends into the liquid storage tank 302, and the molten plastic raw material in the granulator 1 is extruded into the extrusion pipe 301 in the extrusion cooling cylinder 2. After the water pump 303 is started, the cooling liquid in the liquid storage tank 302 is pumped into the liquid delivery pipe 304 and the inside of the extrusion cooling cylinder 2, so that the strip-shaped plastic in the extrusion pipe 301 in the extrusion cooling cylinder 2 is cooled and formed, the strip-shaped plastic is not deformed due to being pulled into the water tank to be cooled, and the uniformity of the final plastic particles is affected. The cooling liquid after heat exchange is backflowed into the inside of the liquid storage tank 302 through the backflow pipe 305, so that the cooling liquid is recycled.

[0032] In order to further improve the heat exchange and cooling efficiency, the inside of the extrusion cooling cylinder 2 is a hollow structure, and a spiral auger 306 is arranged in the inside of the extrusion cooling cylinder 2. The cooling liquid input into the extrusion cooling cylinder 2 flows through the spiral auger 306 to form spiral turbulent flow, the turbulence degree of the flow field is increased, heat transfer is more efficient, and the cooling effect is improved.

[0033] The natural cooling can not ensure the heat dissipation efficiency of the cooling liquid flowing back into the liquid tank 302, thereby causing the heat dissipation efficiency of the cooling liquid to decrease. Therefore, the device is provided with a refrigerator 307 mounted on the back of the liquid tank 302, and the heat dissipation fins 308 are arrayed on the return pipe 305 and have heat dissipation holes penetrating through the heat dissipation fins 308. The cooling liquid flowing back into the liquid tank 302 is rapidly cooled by the refrigerator 307 to ensure the circulating cooling effect of the cooling liquid. The heat dissipation fins 308 dissipate heat of the relatively hot cooling liquid flowing back in the return pipe 305. The heat dissipation holes in the heat dissipation fins 308 increase the contact area of the heat dissipation fins 308 with air, thereby more effectively dissipating heat.

[0034] The support frames 309 are symmetrically mounted on the left and right sides of the bottom of the extrusion cooling cylinder 2, and the support frames 309 are provided with the placement table 310 mounted on the bottom of the support frames 309. The infusion pipe 304 and the return pipe 305 penetrate through the placement table 310, and the extrusion cooling cylinder 2 is lifted by the placement table 310 and the support frames 309.

[0035] The cooled and formed plastic strip needs to be cut into particles. Therefore, the device is further provided with the cutting mechanism 4. The cutting mechanism 4 includes the cutting motor 401 mounted on the placement table 310 and the bearing seat 402 located on the left side of the cutting motor 401. The cutting motor 401 is provided with the rotating shaft 403 rotatably connected to the bearing seat 402 at the output end. The left end of the rotating shaft 403 is provided with the cutting disc 404. The cutting disc 404 is provided with the cutting blades 405 arrayed in a ring shape on the outer side of the cutting disc 404. The left side of the placement table 310 is provided with the protective shell 406 sleeved on the outer side of the cutting blades 405 through the connecting block. The left side of the placement table 310 is provided with the screening assembly 407 for screening the plastic particles after cutting and granulation. When the cooled and formed plastic strip is extruded, the cutting motor 401 is started to drive the rotating shaft 403 to rotate in the bearing seat 402, thereby driving the cutting blades 405 on the cutting disc 404 on one side of the rotating shaft 403 to rotate, so as to cut and granulate the extruded plastic strip. The arrayed cutting blades 405 keep uniform cutting, thereby ensuring the consistency of the plastic particles. The protective shell 406 is arranged to accommodate the cutting blades 405, thereby improving the safety of the device.

[0036] Embodiment 2

[0037] On the basis of Embodiment 1, as Figures 1-5As shown, in order to further improve the quality of the plastic particles, it is necessary to carry out the uniformity screening on the plastic particles after the granulation, and for this purpose, the device is further provided with a screening assembly 407, which comprises a screening box 4071 placed on the left side of the placing table 310, and an inclined screening mesh plate 4072 is installed in the screening box 4071, a box door 4073 is installed on the left side surface of the screening box 4071, and a transparent tempered glass observation window 4074 is installed on the box door 4073, the cut and granulated plastic particles fall on the screening mesh plate 4072 in the screening box 4071, wherein the larger particles are intercepted by the screening mesh plate 4072, and the plastic particles meeting the standard fall into the bottom of the screening box 4071, and the amount of the plastic particles can be observed through the observation window 4074 on the box door 4073, and the plastic particles can be taken out by opening the box door 4073.

[0038] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0039] Although the embodiments of the present application have been shown and described, it is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A pp plastic granulator comprising an extrusion cooling cylinder (2) mounted on the left side of the discharge pipe of the granulator (1), characterized in that: The extrusion cooling cylinder (2) is provided with a cooling forming mechanism (3) for cooling and forming the strip-shaped plastic, and the left end of the extrusion cooling cylinder (2) is provided with a cutting mechanism (4) for cutting and granulating the strip-shaped plastic. The cooling forming mechanism (3) comprises an extrusion pipe (301) installed in the extrusion cooling cylinder (2) in an annular array, a liquid storage tank (302) is installed below the extrusion cooling cylinder (2), a water pump (303) is installed on the liquid storage tank (302), a liquid delivery pipe (304) extending into the extrusion cooling cylinder (2) is installed at the outlet of the water pump (303), and a backflow pipe (305) extending into the liquid storage tank (302) is installed at the bottom left side of the extrusion cooling cylinder (2).

2. The pp plastic particle granulator according to claim 1, characterized in that: The extrusion cooling cylinder (2) is hollow, and a spiral auger (306) is installed inside.

3. The pp plastic particle granulator according to claim 1, characterized in that: A refrigeration device (307) is installed on the back of the liquid storage tank (302), and a plurality of heat dissipation fins (308) are installed in an array on the backflow pipe (305), and a plurality of heat dissipation holes are formed through the heat dissipation fins (308).

4. The pp plastic granulator according to claim 1, characterized in that: Support frames (309) are symmetrically installed on the left and right sides of the bottom of the extrusion cooling cylinder (2), and a placement table (310) is installed at the bottom of the support frames (309), and the liquid delivery pipe (304) and the backflow pipe (305) both penetrate the placement table (310).

5. The pp plastic granulator according to claim 1, characterized in that: The cutting mechanism (4) comprises a cutting motor (401) installed on the placement table (310) and a bearing seat (402) located on the left side of the cutting motor (401), the cutting motor (401) is connected with a rotating shaft (403) rotatingly connected in the bearing seat (402) at the output end, a cutting disc (404) is installed at the left end of the rotating shaft (403), a plurality of cutting blades (405) are installed in an annular array on the outer side of the cutting disc (404), a protective shell (406) is installed on the outer side of the cutting blades (405) through a connecting block on the left side of the placement table (310), and a screening assembly (407) for screening the plastic particles after cutting and granulation is placed on the left side of the placement table (310).

6. A pp plastic pelletizer as claimed in claim 5, wherein: The screening assembly (407) comprises a screening box (4071) placed on the left side of the placement table (310), and a screening mesh (4072) is installed obliquely in the screening box (4071), a box door (4073) is installed on the left side surface of the screening box (4071), and an observation window (4074) made of transparent tempered glass is installed on the box door (4073).

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