CN109624210B

CN109624210B - Plastic granules material loading machine

Info

Publication number: CN109624210B
Application number: CN201811559590.6A
Authority: CN
Inventors: 彭华雯
Original assignee: Ganzhou Tongzhou Plastic Machinery Co ltd
Current assignee: Ganzhou Tongzhou Plastic Machinery Co ltd
Priority date: 2018-12-20
Filing date: 2018-12-20
Publication date: 2021-03-02
Anticipated expiration: 2038-12-20
Also published as: CN109624210A

Abstract

The invention provides a plastic particle feeding machine which comprises a barrel body, wherein a heat conducting plate is arranged on the inner wall of the barrel body, cavities with one open outer wall side are formed in the heat conducting plate, arc-shaped cover plates are arranged on the outer sides of the open openings, a heating tube mounting seat and a heating tube are arranged on the concave surface of each arc-shaped cover plate, and the heating tube is positioned in the cavity; the top of the barrel body is provided with a material containing hopper, a stirring rod driven by a driving motor is arranged in the barrel body, an annular plate is arranged below the material containing hopper, the top surface of the annular plate is provided with two guide rails, the guide rails are provided with stop blocks used for plugging the bottom of the material containing hopper, and the stop blocks are driven by a double-shaft motor through lead screws to move in opposite directions or move away from each other; the stirring rod positioned below the annular plate is provided with a spiral stirring blade; the plastic particle preheating device has the function of preheating plastic particles, so that the melting time of the subsequent plastic particles can be shortened, and the production efficiency is improved; the heating structure is convenient to disassemble and assemble, and the maintenance and the replacement of the heating structure are convenient; and the internal materials can be stirred, so that heat transfer is facilitated, and a good preheating effect is provided.

Description

Plastic granules material loading machine

Technical Field

The invention relates to the field of feeding machines, in particular to a plastic particle feeding machine.

Background

Injection molding, also known as injection molding, is a method of molding by injection molding, in which a completely molten plastic material is stirred by a screw at a certain temperature, injected into a mold cavity at a high pressure, and cooled to solidify to obtain a molded article. The method is suitable for mass production of parts with complex shapes, and is one of important processing methods.

In the injection molding process, plastic particles are generally conveyed and thrown by a feeding machine, most of the existing feeding machines do not have a preheating function, so that the subsequent melting of the plastic particles needs longer time, the processing and production time is prolonged, and the production efficiency is reduced; although a few feeding machines have the preheating function, most of the preheating feeding machines of the type have complex structures, and internal heating devices are difficult to disassemble and assemble, inconvenient to overhaul and replace and inconvenient to operate; and the heat transfer between the internal materials is not uniform, so that a good preheating effect cannot be achieved.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a plastic particle feeding machine which is novel in structure, has the function of preheating plastic particles, can shorten the melting time of the subsequent plastic particles, shortens the processing and production time and improves the production efficiency; the heating structure is convenient to disassemble and assemble, and the maintenance and the replacement of the heating structure are convenient; and the device can control the addition of subsequent new materials and stir the internal materials at regular time, thereby facilitating heat transfer and providing good preheating effect.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a plastic particle feeding machine which comprises a barrel body, wherein a feeding pipe is communicated with the bottom of the barrel body, a feeding valve is arranged on the feeding pipe, a plurality of vertically arranged heat-conducting plates are fixedly arranged on the inner wall of the barrel body, the width of each heat-conducting plate is smaller than the radius length of the inner wall of the barrel body, the heat-conducting plates are distributed in a circumferential array manner around the axis of the barrel body, the side wall, away from the axis of the barrel body, of each heat-conducting plate is fixedly connected with the inner wall of the barrel body, the bottom wall of each heat-conducting plate is fixedly connected with the bottom wall of the barrel body and extends into the feeding pipe, and the top surfaces of the heat-conducting plates are downwards; cavities are formed in the heat conduction plates, an opening penetrating through the outer wall of the barrel body is formed in one side, away from the axis of the barrel body, of each cavity, and the heat conduction plates and the barrel body are of an integral structure;

the outer side of each open hole is provided with an arc-shaped cover plate used for covering the open hole, the concave surface of the arc-shaped cover plate is abutted against the outer wall of the barrel body and is fixedly connected with the outer wall of the barrel body through screws, the concave surface of the arc-shaped cover plate is fixedly provided with a plurality of heating tube mounting seats, each heating tube mounting seat is provided with a heating tube, and the heating tubes are positioned in the cavities;

a containing hopper is arranged in the barrel body, the outer wall of the containing hopper is matched with the inner wall of the barrel body in shape, a first convex ring is arranged on the outer wall of the top of the containing hopper, a second convex ring is arranged on the outer wall of the top of the barrel body, the containing hopper is positioned at the top of the barrel body, the first convex ring is positioned on the outer side of the top of the barrel body, the bottom surface of the first convex ring is abutted against the top surface of the second convex ring, a barrel cover is covered at the top of the barrel body, the barrel cover, the first convex ring and the second convex ring are fixedly connected through bolts, and a feeding pipe is communicated with the barrel cover;

a supporting seat is arranged inside the lower end of the blanking pipe, the side wall of the supporting seat is fixedly connected with the inner wall of the blanking pipe through a plurality of connecting rods, a stirring rod penetrates through the supporting seat and the barrel cover through a bearing, the top end of the stirring rod penetrates through the barrel cover, the end part of the stirring rod is connected with an output shaft of a driving motor through a coupling, and the driving motor is fixedly arranged on the top surface of the barrel cover through a supporting frame; an annular plate is arranged below the material containing hopper, the annular plate is of a grid plate structure, the outer wall of the annular plate is fixedly connected with the inner wall of the barrel body, the circle center of the annular plate is positioned on the axis of the barrel body, the inner diameter of the annular plate is larger than the diameter of the discharging opening of the material containing hopper, two guide rails are fixedly arranged on the top surface of the annular plate, the two guide rails are arranged along the radial direction of the annular plate and are positioned on the same straight line, the two guide rails are symmetrically arranged relative to the central line of the annular plate, a stop block is arranged on each guide rail in a sliding manner, the top surface of each stop block and the bottom surface of the discharging opening of the material containing hopper are positioned at the same height, a double-shaft motor is arranged on the same side of each stop block, lead screws are arranged on the two sides of the double-shaft motor and are arranged on the top surface of the annular, the end parts of the two screw rods correspond to the two output shafts of the double-shaft motor and are connected through a coupler, a sliding block is arranged on each screw rod in a sliding mode, the two sliding blocks correspond to the two stop blocks respectively and are fixedly connected with the two stop blocks respectively, and the two stop blocks move towards each other or move away from each other under the driving of the two screw rods; the middle part of the side surface of the baffle close to the stirring rod is provided with a semicircular arc-shaped groove, and the arc-shaped groove is matched with the stirring rod in shape; and a spiral stirring blade is arranged on the stirring rod below the annular plate.

In a preferred technical scheme of the invention, the arc-shaped cover plate comprises a foam layer and an aluminum alloy layer which are fixedly bonded with each other, and the aluminum alloy layer is positioned on one side far away from the barrel body.

In a preferred technical scheme of the invention, at least three heating tube installation seats are arranged on each arc-shaped cover plate, the three heating tube installation seats are vertically arranged and are positioned on the same vertical line, and the heating tubes installed on the heating tube installation seats are matched with the cavity in shape.

In a preferred technical scheme of the invention, a partition board for isolating light is arranged between any two adjacent heating tubes, and the periphery of the partition board is fixedly propped against the inner wall of the cavity; the arc-shaped cover plate is provided with three light holes corresponding to the three heating tubes, and a perspective window made of heat insulation glass is embedded in each light hole.

In a preferred technical scheme of the invention, the thickness of the thin wall of the heat conducting plate is 1 mm-3 mm.

In a preferred technical scheme of the invention, the bottom of the barrel body is of a funnel-shaped structure, and the bottom of the heat conduction plate is matched with the shape of the inner wall of the bottom of the barrel body.

The invention has the beneficial effects that:

the plastic particle feeding machine provided by the invention is novel in structure, and the heat conducting plate and the heating tube are designed to have the function of preheating plastic particles, so that the plastic particles have a certain temperature before entering a smelting furnace, the melting time of the subsequent plastic particles can be shortened, the processing and production time can be shortened, and the production efficiency can be improved; the arc-shaped cover plate for mounting the heating tube is connected with the barrel body through the screw, so that the heating tube can be conveniently disassembled and assembled, the heating tube can be conveniently overhauled or replaced, and the heating tube can be replaced even under the normal working condition of the feeding machine; the design of the material containing hopper can temporarily store the subsequently added materials, and the addition amount is controlled under the coordination of the double-shaft motor, the lead screw and the stop block, so that the temperature of the preheated materials is prevented from being reduced due to excessive material addition; the driving motor, the stirring rod and the spiral stirring blade are matched, so that when the injection molding machine is not supplied with materials, the spiral stirring blade rotates upwards along with the stirring rod to stir the materials, heat transfer is facilitated, and a good preheating effect is provided; when needs are for the injection molding machine feed, spiral stirring leaf is along with the puddler down rotation, arranges the material with higher speed, prevents to block up.

Drawings

Fig. 1 is a schematic structural view of a plastic pellet feeder according to an embodiment of the present invention;

FIG. 2 is a top view of an annular plate and its top surface configuration provided in an embodiment of the present invention;

fig. 3 is a schematic structural view of an arc-shaped cover plate provided in an embodiment of the present invention.

In the figure:

100. a barrel body; 110. a discharging pipe; 120. a discharge valve; 130. a second convex ring; 140. a supporting seat; 150. a connecting rod; 160. an annular plate; 170. a guide rail; 180. a stopper; 190. an arc-shaped slot; 200. a heat conducting plate; 210. a cavity; 220. an opening is formed; 230. a partition plate; 300. an arc-shaped cover plate; 310. a heating tube mounting base; 320. a heat generating tube; 330. a foam layer; 340. an aluminum alloy layer; 350. a light-transmitting hole; 360. a perspective window; 400. a material containing hopper; 410. a first convex ring; 500. a barrel cover; 510. a feeding pipe; 520. a support frame; 610. a stirring rod; 620. a drive motor; 630. a spiral stirring blade; 710. a double-shaft motor 720 and a screw rod; 730. a slide block.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1 and 2, in a specific embodiment of the present invention, a plastic particle feeder is disclosed, which includes a barrel 100, a feeding pipe 110 is communicated with the bottom of the barrel 100, a feeding valve 120 is disposed on the feeding pipe 110, a plurality of vertically disposed heat conducting plates 200 are fixedly disposed on an inner wall of the barrel 100, a width of each heat conducting plate 200 is smaller than a radius length of the inner wall of the barrel 100, the plurality of heat conducting plates 200 are circumferentially distributed around an axis of the barrel 100 in an array manner, a sidewall of each heat conducting plate 200 away from the axis of the barrel 100 is fixedly connected to the inner wall of the barrel 100, a bottom wall of each heat conducting plate 200 is fixedly connected to the bottom wall of the barrel 100 and extends into the feeding pipe 110, and a top surface of each heat conducting plate 200 is disposed from a side close to the inner wall of the barrel 100 to a; a cavity 210 is arranged in each heat conduction plate 200, an opening 220 penetrating through the outer wall of the barrel body 100 is arranged on one side of the cavity 210 far away from the axis of the barrel body 100, and the heat conduction plates 200 and the barrel body 100 are of an integral structure;

an arc-shaped cover plate 300 used for covering the open opening 220 is arranged on the outer side of each open opening 220, the concave surface of each arc-shaped cover plate 300 is abutted against the outer wall of the barrel 100 and is fixedly connected with the outer wall of the barrel through screws, a plurality of heating tube installation seats 310 are fixedly arranged on the concave surface of each arc-shaped cover plate 300, a heating tube 320 is installed on each heating tube installation seat 310, and the heating tube 320 is positioned in the cavity 210;

a material containing hopper 400 is arranged in the barrel body 100, the outer wall of the material containing hopper 400 is matched with the inner wall of the barrel body 100 in shape, a first convex ring 410 is arranged on the outer wall of the top of the material containing hopper 400, a second convex ring 130 is arranged on the outer wall of the top of the barrel body 100, the material containing hopper 400 is positioned at the top of the barrel body 100, the first convex ring 410 is positioned at the outer side of the top of the barrel body 100, the bottom surface of the first convex ring 410 is abutted against the top surface of the second convex ring 130, a barrel cover 500 is covered at the top of the barrel body 100, the barrel cover 500, the first convex ring 410 and the second convex ring 130 are fixedly connected through bolts, and a material feeding pipe 510 is communicated;

a supporting seat 140 is arranged inside the lower end of the blanking pipe 110, the side wall of the supporting seat 140 is fixedly connected with the inner wall of the blanking pipe 110 through a plurality of connecting rods 150, a stirring rod 610 penetrates through the supporting seat 140 and the barrel cover 500 through a bearing, the top end of the stirring rod 610 penetrates through the barrel cover 500, the end part of the stirring rod is connected with an output shaft of a driving motor 620 through a coupling, and the driving motor 620 is fixedly arranged on the top surface of the barrel cover 500 through a supporting frame 520; an annular plate 160 is arranged below the material containing hopper 400, the annular plate 160 is of a grid plate structure, the outer wall of the annular plate 160 is fixedly connected with the inner wall of the barrel body 100, the circle center of the annular plate 160 is positioned on the axis of the barrel body 100, the inner diameter of the annular plate 160 is larger than the diameter of the discharging opening of the material containing hopper 400, as shown in fig. 2, two guide rails 170 are fixedly arranged on the top surface of the annular plate 160, the two guide rails 170 are both arranged along the radial direction of the annular plate 160, the two guide rails 170 are positioned on the same straight line, the two guide rails 170 are symmetrically arranged about the central line of the annular plate 160, a stopper 180 is slidably arranged on each guide rail 170, the top surface of the stopper 180 and the bottom surface of the discharging opening of the material containing hopper 400 are positioned at the same height, a double-shaft motor 710 is arranged on the same side of the two stoppers 180, lead screws 720, the two lead screws 720 are arranged on the top surface of the annular plate 160 through bearing seats, the two lead screws 720 are parallel to the guide rail 170, the end parts of the two lead screws 720 correspond to the two output shafts of the double-shaft motor 710 and are connected through a coupling, a sliding block 730 is arranged on each lead screw 720 in a sliding manner, the two sliding blocks 730 respectively correspond to the two stop blocks 180 and are respectively and fixedly connected with the two stop blocks 180, and the two stop blocks 180 move towards each other or move away from each other under the driving of the two lead screws 720; the middle part of the side surface of the baffle 180 close to the stirring rod 610 is provided with a semicircular arc-shaped groove 190, and the arc-shaped groove 190 is matched with the stirring rod 610 in shape; the stirring rod 610 positioned below the annular plate 160 is provided with a spiral stirring blade 630.

The plastic particle feeding machine is novel in structure, and the heat conducting plate 200 and the heating tube 320 are designed to have the function of preheating plastic particles, so that the plastic particles have a certain temperature before entering a smelting furnace, the melting time of the subsequent plastic particles can be shortened, the processing and production time can be shortened, and the production efficiency can be improved; the arc-shaped cover plate 300 for mounting the heating tube 320 is connected with the barrel 100 through screws, so that the heating tube 320 can be conveniently disassembled and assembled, the heating tube 320 can be conveniently overhauled or replaced, and the heating tube 320 can be replaced even under the normal working condition of a feeding machine; the design of the material containing hopper 400 can temporarily store the materials added subsequently, and the addition amount is controlled under the matching of the double-shaft motor 710, the lead screw 720 and the stop block 180, so that the temperature of the preheated materials is prevented from being reduced due to excessive material addition; the driving motor 620, the stirring rod 610 and the spiral stirring blade 630 are matched, so that when the injection molding machine is not supplied with materials, the spiral stirring blade 630 rotates upwards along with the stirring rod 610 to stir the materials, heat transfer is facilitated, and a good preheating effect is provided; when the injection molding machine needs to be supplied, the spiral stirring blades 630 rotate downwards along with the stirring rod 610, so that the material is discharged in an accelerating manner, and the blockage is prevented.

Further, the arc-shaped cover plate 300 includes a foam layer 330 and an aluminum alloy layer 340 that are bonded and fixed to each other, and the aluminum alloy layer 340 is located on a side away from the barrel 100; the design of foam layer 330 and aluminium alloy layer 340 can constitute the heat preservation, ensures that a large amount of heat lock stay in the cavity 210, prevents the heat loss that heating tube 320 produced, reduces extravagantly.

Further, as shown in fig. 3, at least three heating tube installation seats 310 are arranged on each arc-shaped cover plate 300, the three heating tube installation seats 310 are vertically arranged and located on the same vertical line, and the heating tube 320 installed on each heating tube installation seat 310 is matched with the cavity 210 in shape; at least three heating tube mounting seats 310 are installed to provide sufficient heat; the length of the heating tube 320 is matched with the width of the cavity 210, so that the heating tube 320 is close to the inner wall of the cavity 210 as much as possible, and the heat transfer effect is improved; and the heating tube 320 is an independent body, one of the heating tubes can be singly replaced after being burned out, and the heating tube 320 can be replaced even under the normal working condition of the feeding machine, so that the waste is reduced and the cost is reduced.

Furthermore, a partition plate 230 for isolating light is arranged between any two adjacent heating tubes 320, and the periphery of the partition plate 230 is fixedly abutted against the inner wall of the cavity 210; three light holes 350 are formed in the arc-shaped cover plate 300 corresponding to the three heating tubes 320, and a perspective window 360 made of heat-insulating glass is embedded in each light hole 350; the cooperation of the partition 230 and the light hole 350 can facilitate the timely checking of the working condition of each heating tube 320 from the outside, the timely finding of whether the heating tube 320 is burned out, the timely maintenance or replacement, and the guarantee of normal heat supply; the transparent window 360 is made of heat-insulating glass to reduce heat loss.

Further, the thickness of the thin wall of the heat conducting plate 200 is 1 mm-3 mm; the heat conducting plate 200 with the structure can facilitate heat transfer and improve preheating effect.

Further, the bottom of the barrel body 100 is of a funnel-shaped structure, and the bottom of the heat conducting plate 200 is matched with the shape of the inner wall of the bottom of the barrel body 100; the bottom of the barrel body 100 is funnel-shaped, so that plastic particles can be collected to the bottom of the barrel body 100 conveniently, and when the blanking valve 120 is opened, the plastic particles can be smoothly dismounted and enter the next device.

Principle of operation

The specific process of preheating the plastic particles comprises the steps of firstly feeding a certain amount of plastic particles into the barrel body 100 through the feeding pipe 510, then starting the double-shaft motor 710, enabling the two stoppers 180 to approach each other and movably abut against the stirring rod 610, and then continuously feeding the plastic particles through the feeding pipe 510 and temporarily storing the plastic particles in the material containing hopper 400; then, the heating tube 320 and the driving motor 620 are started, the heating tube 320 continuously supplies heat and preheats plastic particles, the driving motor 620 rotates reversely in the gap to drive the spiral stirring blade 630 to rotate upwards to stir materials, heat transfer is facilitated, and a good preheating effect is provided; when the injection molding machine needs to be supplied with materials, the blanking valve 120 is opened, the driving motor 620 positively drives and drives the spiral stirring blade 630 to rotate downwards, so that accelerated discharging is realized, after the preset opening duration of the blanking valve 120 is reached, the blanking valve 120 is closed, the driving motor 620 is started to rotate reversely in a clearance, the spiral stirring blade 630 rotates upwards, the materials are stirred, and preheating is continued; after the blanking valve 120 is opened for a certain number of times, the biaxial motor 710 is started to enable the two stoppers 180 to move away from each other, so that plastic particles fall from the material containing hopper 400 to the position below the annular plate 160, after the opening state is maintained for a preset time, the biaxial motor 710 is started to rotate reversely, the two stoppers 180 move oppositely and block the material outlet of the material containing hopper 400, and then the preheating action is continued; it should be noted that, a worker can check the working condition of the corresponding heating tube 320 through the light hole 350, if the heating tube 320 is found to be out of order or burnt out, the heating tube 320 needs to be replaced, and when the heating tube 320 is replaced, the corresponding arc-shaped cover plate 300 can be directly detached, and the heating tube 320 that needs to be replaced can be replaced.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.

Claims

1. The utility model provides a plastic granules material loading machine, includes staving (100), staving (100) bottom intercommunication is equipped with unloading pipe (110), be equipped with unloading valve (120) on unloading pipe (110), its characterized in that:

a plurality of heat conduction plates (200) which are vertically arranged are fixedly arranged on the inner wall of the barrel body (100), the width of each heat conduction plate (200) is smaller than the radius length of the inner wall of the barrel body (100), the heat conduction plates (200) are distributed in a circumferential array manner around the axis of the barrel body (100), the side wall of each heat conduction plate (200) far away from the axis of the barrel body (100) is fixedly connected with the inner wall of the barrel body (100), the bottom wall of each heat conduction plate (200) is fixedly connected with the bottom wall of the barrel body (100) and extends into the discharging pipe (110), and the top surface of each heat conduction plate (200) is obliquely arranged from one side close to the inner wall of the barrel body (100) to one side close to the axis of; cavities (210) are formed in the heat conduction plates (200), an opening (220) penetrating through the outer wall of the barrel body (100) is formed in one side, away from the axis of the barrel body (100), of each cavity (210), and the heat conduction plates (200) and the barrel body (100) are of an integrated structure;

arc-shaped cover plates (300) used for covering the open openings (220) are arranged on the outer sides of the open openings (220), concave surfaces of the arc-shaped cover plates (300) are abutted against the outer wall of the barrel body (100) and fixedly connected through screws, a plurality of heating tube installation seats (310) are fixedly arranged on the concave surfaces of the arc-shaped cover plates (300), heating tubes (320) are installed on the heating tube installation seats (310), and the heating tubes (320) are located in the cavities (210);

a material containing hopper (400) is arranged in the barrel body (100), the outer wall of the material containing hopper (400) is matched with the inner wall of the barrel body (100) in shape, a first convex ring (410) is arranged on the outer wall of the top of the material containing hopper (400), a second convex ring (130) is arranged on the outer wall of the top of the barrel body (100), the material containing hopper (400) is positioned at the top of the barrel body (100), the first convex ring (410) is positioned on the outer side of the top of the barrel body (100), the bottom surface of the first convex ring is abutted to the top surface of the second convex ring (130), a barrel cover (500) is covered at the top of the barrel body (100), the barrel cover (500), the first convex ring (410) and the second convex ring (130) are fixedly connected through bolts, and a material feeding pipe (510) is communicated with the barrel;

a supporting seat (140) is arranged inside the lower end of the blanking pipe (110), the side wall of the supporting seat (140) is fixedly connected with the inner wall of the blanking pipe (110) through a plurality of connecting rods (150), a stirring rod (610) penetrates through the supporting seat (140) and the barrel cover (500) through a bearing, the top end of the stirring rod (610) penetrates through the barrel cover (500), the end part of the stirring rod is connected with an output shaft of a driving motor (620) through a coupler, and the driving motor (620) is fixedly arranged on the top surface of the barrel cover (500) through a supporting frame (520); an annular plate (160) is arranged below the material containing hopper (400), the annular plate (160) is of a grid plate structure, the outer wall of the annular plate (160) is fixedly connected with the inner wall of the barrel body (100), the circle center of the annular plate (160) is located on the axis of the barrel body (100), the inner diameter of the annular plate (160) is larger than the diameter of a discharging opening of the material containing hopper (400), two guide rails (170) are fixedly arranged on the top surface of the annular plate (160), the two guide rails (170) are arranged along the radial direction of the annular plate (160), the two guide rails (170) are located on the same straight line, the two guide rails (170) are symmetrically arranged relative to the central line of the annular plate (160), a stop block (180) is arranged on each guide rail (170) in a sliding manner, the top surface of the stop block (180) is located at the same height as the bottom surface of the discharging opening of the material containing hopper (400), a double-shaft motor (710) is arranged on the same side of the two stop blocks (180), lead screws (720) are arranged on two sides of the double-shaft motor (710), the two lead screws (720) are arranged on the top surface of the annular plate (160) through bearing seats, the two lead screws (720) are parallel to the guide rail (170), the end parts of the two lead screws (720) correspond to two output shafts of the double-shaft motor (710) and are connected through a coupler, a sliding block (730) is arranged on each lead screw (720) in a sliding mode, the two sliding blocks (730) correspond to the two stop blocks (180) respectively and are fixedly connected with the two stop blocks (180), and the two stop blocks (180) move towards each other or move away from each other under the driving of the two lead screws (720); a semicircular arc-shaped groove (190) is formed in the middle of the side face, close to the stirring rod (610), of the stop block (180), and the arc-shaped groove (190) is matched with the stirring rod (610) in shape; and spiral stirring blades (630) are arranged on the stirring rod (610) below the annular plate (160).

2. A plastic pellet feeder as claimed in claim 1, wherein:

arc apron (300) are including mutual fixed foam layer (330) and the aluminium alloy layer (340) that bonds, aluminium alloy layer (340) are located and keep away from one side of staving (100).

3. A plastic pellet feeder as claimed in claim 2, wherein:

at least three heating tube installation seats (310) are arranged on each arc-shaped cover plate (300), the three heating tube installation seats (310) are vertically arranged and are positioned on the same vertical line, and the heating tubes (320) installed on the heating tube installation seats (310) are matched with the cavities (210) in shape.

4. A plastic pellet feeder as claimed in claim 3, wherein:

a partition plate (230) for isolating light is arranged between any two adjacent heating tubes (320), and the periphery of the partition plate (230) is fixedly abutted against the inner wall of the cavity (210); the arc-shaped cover plate (300) is provided with three light holes (350) corresponding to the three heating tubes (320), and a perspective window (360) made of heat-insulating glass is embedded in each light hole (350).

5. A plastic granules feeder according to claim 4, characterized in that:

the thickness of the thin wall of the heat conducting plate (200) is 1 mm-3 mm.

6. A plastic granules feeder according to claim 5, characterized in that:

the bottom of the barrel body (100) is of a funnel-shaped structure, and the bottom of the heat conducting plate (200) is matched with the shape of the inner wall of the bottom of the barrel body (100).