CN205818227U - A pelletizing device of an underwater pelletizer - Google Patents

Abstract

The utility model discloses a granulating device of an underwater granulator, which comprises a cutter component, a granulating cavity, a cooling water pipe, a heating structure and a mould, wherein the cutter component is arranged in the granulating cavity; when the plastic cutting device is used, the cutter assembly enters the cutting grain cavity to be close to the working surface of the die, molten plastic enters from a die hole in the die, and the molten plastic is heated and then interacts with the cutter rotating at a high speed and cooling water to generate plastic particles. This pelleter device of underwater granulator simple structure can effectively prevent the rigidity collision of cutter and mould, reduces the wearing and tearing of cutter, also reduces the destruction of all moulds simultaneously, promotes pelleter efficiency under water.

Description

A pelletizing device of an underwater pelletizer

technical field

The utility model relates to the technical field of plastic pelletizers, in particular to a pelletizer for underwater pelletizers.

Background technique

The working principle of the traditional waste plastic recycling extrusion granulator is to melt and filter the plastic through a single-stage or double-stage extruder, extrude the strands, and then pelletize after cooling and solidification, while underwater pelletizing extrusion The granulator is a new type of machine that contacts the cooling water at the moment when the melt is extruded from the die surface and directly granulates without using or being unable to pull the sliver. The melt granulation has obvious advantages compared with the solid granulation. Advantage. Since the plastic is scraped off by the blade in the melt state and solidified after being cooled by circulating water, high polymers of different viscosities can be pelletized in this way, and pelletizing in the melt state will not form any dust, and pelletizing The shape is regular, and the packaging and transportation are relatively convenient; according to the extrusion volume, the output volume of the die head and the pelletizing speed can be adjusted automatically to change the pelletizing size. Size and shape; granulation and cooling are integrated, eliminating the need for a 4-6mm long cold water tank, which greatly reduces the floor space; the granulation process is automated, easy to operate, low noise, and good slice quality. It has larger output and lower energy consumption than traditional strand pelletizing.

The underwater pelletizing and pelletizing unit generally includes a single-stage or two-stage exhaust extruder, a grinding and pelletizing system, a flexible knife seat, a vertical automatic dehydration (drying) device, a vibrating separator, an air delivery system, a set Material hopper, control system composition. When the uniform high-temperature molten material enters the flow channel of the die head from the end of the upstream equipment (reactor/screw extruder/melt pump, etc.), the material is cut into pieces by the high-speed rotating pelletizer blade just as it leaves the die hole. The droplet enters the processing water. Due to the physical characteristics of maximizing the specific surface area of the particles and the temperature difference between the molten droplet polymer and the processing water, the droplet solidifies and forms particles close to spheres. This granulation method "between the critical state of hot cutting and cold cutting" determines that it can be well qualified for the granulation operation of materials with poor strength in molten state, high viscosity and high heat sensitivity.

Among them, the grinding and granulation system is the key component of the underwater granulator. The cutter and the mold hole cooperate to produce plastic particles. The cutter and the mold are often very close, which is easy to cause collision or wear of the cutter, and even damage the mold. .

Contents of the invention

The purpose of the invention of the utility model is to overcome the deficiencies of the prior art methods and provide a simple structure that can effectively prevent the rigid collision between the cutter and the mold, reduce the wear of the cutter and reduce the damage of the mold at the same time, and lift the water The pelletizing device of the underwater pelletizer with lower pelletizer efficiency.

In order to realize the above-mentioned purpose of the invention, following technical scheme is proposed:

A pelletizing device of an underwater pelletizer, comprising a cutter assembly, a pelletizing chamber, a cooling water pipe, a heating structure, and a mould. The knife is installed on the side end of the knife seat through a fixing nut, and the knife shaft and the knife seat are floatingly connected at the center; the cooling water pipes are arranged on the upper and lower sides of the cutting chamber and communicate with each other, and the cooling water enters the cutting chamber from one of the cooling water pipes. The pelletizing cavity flows out from another cooling water pipe; the other end of the pelletizing cavity is connected to the mold, and a heating assembly is arranged on the outer circumference of the mold; when in use, the cutter assembly enters the pelletizing cavity and is close to the working surface of the mold, and the molten plastic flows from the mold The upper mold hole enters, and after heating, it works together with the high-speed rotating cutter and cooling water to produce plastic particles.

The pelletizing chamber is a metal pipe, and the inner wall is hardened to prevent rust.

The surface of the mold opposite to the cutting knife has an annular ceramic layer, and the mold hole is arranged in the middle of the annular ceramic layer. The material of the ceramic layer is zirconia; the thickness of the zirconia layer is greater than 5mm.

The die hole is a series of through holes arranged in an annular array. After the molten plastic is extruded and filtered by the filter device, it enters the pelletizing chamber from the die hole.

The heating structure includes a heating tube mounting seat and a heating tube; the heating tube mounting seat is in the shape of a ring, and the mold is arranged in the heating tube mounting seat; a number of mounting holes are arranged on the heating tube mounting seat, and the heating tube is arranged on the inside the hole.

The knife seat is a square structure, and four cutting knives are respectively arranged at the four corners of the square. The four cutting knives are installed symmetrically, and arc-shaped grooves are arranged between the two cutting knives, and the opposite arc-shaped grooves are symmetrical to each other.

The floating connection includes pins and installation grooves, and more than one set of pins are arranged at the end of the cutter shaft and installed vertically with the cutter shaft; The axial length of the groove is greater than that of the pin, and the radial direction is in clearance fit with the pin; the contact surface between the end of the knife shaft and the mounting hole of the knife seat is a spherical clearance fit. When in use, the cutter shaft drives the tool seat to rotate at high speed. Since there is a certain gap between the axial tool shaft and the tool seat, the tool seat can be offset by a certain angle on the contact spherical surface. When rotating, due to the self-centering of the spherical surface As a result, the tool seat can maintain a perpendicular relationship with the tool axis.

The cutter is a rectangular alloy cutter with surface hardening treatment, and several installation holes are arranged in the middle of the cutter. When the cutting knife is worn out, the utilization rate of the cutting knife is improved by changing different mounting holes.

The beneficial effect of this utility model:

In the pelletizing device of the underwater pelletizer of the utility model, the cutter assembly adopts a floating connection between the cutter seat and the cutter shaft, so that the collision between the cutter and the mold can be effectively prevented, the wear of the cutter can be reduced, and the work of the cutter A ceramic layer is set on the surface, which effectively reduces the wear of the mold.

Description of drawings

Fig. 1 is a front sectional view of a pelletizing device;

Fig. 2 is a left view of the pelletizing device;

Fig. 3 is a three-dimensional perspective view of the cutter assembly;

Figure 4 is a front sectional view of the cutter assembly;

Fig. 5 is a three-dimensional structure diagram of a cutter;

Among them, 1. Cutter assembly; 2. Pelletizing cavity; 3. Cooling water pipe; 4. Heating pipe mounting seat; 5. Heating pipe; 6. Mold; 7. Mold hole; 8. Ceramic layer;

11, knife seat; 12, knife shaft; 13, cutter; 14, fixed nut; 15, pin; 16, installation groove; 131, installation hole.

detailed description

Below in conjunction with accompanying drawing, the pelletizing device of a kind of underwater pelletizer of the present utility model is described in further detail:

As shown in Figure 1, a pelletizing device of an underwater pelletizer includes a cutter assembly 1, a pelletizing chamber 2, a cooling water pipe 3, a heating structure, and a mold 6, and the cutter assembly 1 is arranged in the pelletizing chamber 2 , including a knife seat 11, a knife shaft 12, a cutter 13, the cutter 13 is installed on the side end of the knife seat 11 through a fixing nut 14, and the knife shaft 12 is connected to the knife seat 11 in a floating position at the center; the cooling water pipe 3 are arranged on the upper and lower sides of the pelletizing chamber 2 and communicate with each other. Cooling water enters the pelletizing chamber 2 from one of the cooling water pipes 3 and flows out from the other cooling water pipe 3; the other end of the pelletizing chamber 2 is connected with the mold 6, and the mold 6 The outer circumference is provided with a heating assembly; when in use, the cutter assembly 1 enters the pelletizing chamber 2 and is close to the working surface of the mold 6, and the molten plastic enters from the mold hole 7 on the mold 6, and is heated with the high-speed rotating cutter 13 and The cooling water works together to create plastic particles.

Preferably, the pelletizing chamber 2 is a metal pipe, the inner wall of which is surface-hardened and has good rust resistance.

As shown in FIG. 2 , the surface of the mold 6 opposite to the cutter 13 has an annular ceramic layer 8 , and the mold hole 7 is arranged in the middle of the annular ceramic layer 8 . The material of the ceramic layer 8 is zirconia; the thickness of the zirconia layer is greater than 5mm. The die hole 7 is a series of through holes arranged in an annular array, and the molten plastic enters the pelletizing cavity 2 from the die hole 7 after being extruded and filtered by the filter screen device.

As shown in Figures 1 and 2, the heating structure includes a heating pipe mounting seat 4 and a heating pipe 5; the heating pipe mounting seat 4 is in the shape of a ring, and the mold 7 is arranged in the heating pipe mounting seat 4; the heating pipe mounting seat 4 Several installation holes are arranged on the top, and the heating pipe 5 is arranged in the installation holes.

As shown in Figure 3, the knife holder 11 is a square structure, and a cutting knife is respectively arranged at the four corners of the square. The curved grooves are symmetrical to each other.

As shown in Figure 4, the floating connection includes a pin 15 and a mounting groove 16, and more than one set of pins 15 are arranged at the end of the cutter shaft 12, and are installed vertically with the cutter shaft 12; the mounting groove 16 is arranged on the knife seat 11 in the installation hole, corresponding to the pin 15, the installation groove 16 is longer than the pin 15 in the axial direction, and has a clearance fit with the pin 15 in the radial direction; the contact surface between the end of the knife shaft 12 and the installation hole of the knife seat 11 is a spherical clearance fit . When in use, the knife shaft 12 drives the knife seat 11 to rotate at a high speed. Because there is a certain gap between the axial knife shaft 12 and the knife seat 11, the knife seat 11 can be offset by a certain angle on the contact spherical surface, and when rotating, due to Due to the self-centering effect of the spherical surface, the tool seat 11 can maintain a vertical relationship with the tool shaft 12 .

As shown in FIG. 5 , the cutter 13 is a rectangular alloy cutter with surface hardening treatment, and several mounting holes 131 are provided in the middle of the cutter 13 . When the cutter 13 is worn out, the usage rate of the cutter 13 is improved by replacing different mounting holes 131 .

Claims (10)

1. the pellet device of a underwater pelletizer; it is characterized in that; including cutter assembly, pelletizing chamber, cooling water pipe, heating arrangement, mould; described cutter assembly is arranged on pelletizing chamber; including tool rest, cutter shaft, cutting knife; cutting knife is arranged on the side end of described tool rest by fixing nut, and cutter shaft and tool rest are at center floating connection；Described cooling water pipe is arranged on upper and lower both sides, pelletizing chamber and communicates, and a cooling water cooling water pipe from which enters pelletizing chamber, flows out from another cooling water pipe；The described pelletizing chamber other end is connected with mould, and mould excircle is provided with heating assembly；During use, it is close with die-face that cutter assembly enters pelletizing chamber, and melted plastics die hole from mould enters, and the heated rear and cutting knife of high speed rotating and cooling water act on generation plastic grain jointly.

The pellet device of a kind of underwater pelletizer the most according to claim 1, it is characterised in that described heating arrangement includes adding heat pipe mounting seat, adding heat pipe；The described heat pipe mounting seat that adds is ring-shaped, and mould is arranged on and adds in heat pipe mounting seat；Add and in heat pipe mounting seat, be provided with some installing holes, described in add heat pipe and be arranged in installing hole.

The pellet device of a kind of underwater pelletizer the most according to claim 1, it is characterised in that described die hole is the through hole that a series of annular array is arranged, molten plastic, after filter screen device extruding is filtered, enters pelletizing chamber from die hole.

The pellet device of a kind of underwater pelletizer the most according to claim 1, it is characterised in that described pelletizing chamber is metal tube, the case hardened process of inwall.

The pellet device of a kind of underwater pelletizer the most according to claim 1, it is characterised in that described pelletizing chamber is metal tube, the case hardened process of inwall；Described die hole is the through hole that a series of annular array is arranged, and molten plastic, after filter screen device extruding is filtered, enters pelletizing chamber from die hole.

6., according to the pellet device of a kind of underwater pelletizer described in claim 2 or 5, it is characterised in that the surface that described mould is relative with cutting knife has one layer of ring-shaped pottery layer, described die hole is arranged in the middle of ring-shaped pottery layer.

The pellet device of a kind of underwater pelletizer the most according to claim 6, it is characterised in that described ceramic layer material is zirconium oxide；The thickness of described zirconia layer is more than 5mm.

8. according to the pellet device of a kind of underwater pelletizer described in claim 1-5 or 7 any one; it is characterized in that; described tool rest is square structure; it is respectively arranged with a cutting knife in square corner; four described cutting knifes are symmetrically installed; being provided with arc groove between two cutting knifes, relative arc groove is symmetrical.

9. according to the pellet device of a kind of underwater pelletizer described in claim 1-5 or 7 any one, it is characterised in that described floating connection includes that pin and mounting groove, the described pin of more than a group are arranged on cutter shaft end, with cutter shaft right angle setting；Described mounting groove is arranged in tool rest installing hole, corresponding with pin, and described mounting groove is more than pin at axial length, in radial direction and pin matched in clearance；Cutter shaft end is that Spherical Clearance coordinates with tool rest installing hole contact surface.

10., according to the pellet device of a kind of underwater pelletizer described in claim 1-5 or 7 any one, it is characterised in that described cutting knife is harveyed rectangle alloy cutter, described cutting knife centre position is provided with some installing holes.