CN112123619B - A extruder feed arrangement for powder coating preparation - Google Patents

A extruder feed arrangement for powder coating preparation Download PDF

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Publication number
CN112123619B
CN112123619B CN202010936582.XA CN202010936582A CN112123619B CN 112123619 B CN112123619 B CN 112123619B CN 202010936582 A CN202010936582 A CN 202010936582A CN 112123619 B CN112123619 B CN 112123619B
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Prior art keywords
inner cover
cover
wall
feeding
extruder
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CN202010936582.XA
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CN112123619A (en
Inventor
夏连心
方志望
朱满子
李时雨
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Hunan Lianxin Technology Co Ltd
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Hunan Lianxin Technology Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00Mixing; Kneading
    • B29B7/30Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58Component parts, details or accessories; Auxiliary operations
    • B29B7/60Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00Mixing; Kneading
    • B29B7/30Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix

Abstract

The invention is suitable for the field of extruders, and provides an extruder feeding device for powder coating preparation, which comprises a motor, a feeding box, an outer cover and an inner cover, wherein the output end of the motor is connected with a rotating shaft, and the rotating shaft penetrates through the feeding box, the outer cover and the inner cover and is fixedly connected with the inner cover; the feeding box is provided with a material pouring port and a material discharging port, and the upper end of the inner cover is provided with an annular through hole close to the lower part of the material discharging port; the inner wall of the inner cover is provided with an inclination angle which can enable the coating to roll down along the inner wall of the inner cover, the inner cover is arranged in the outer cover, a plurality of circles of rolling pieces are rotatably arranged between the inner cover and the outer cover, the section of the rotating shaft in the inner cover is also connected with an extrusion part, the extrusion part is arranged close to the inner wall of the inner cover, and a feeding hole is arranged at a position close to the lower part of the inner cover; the outer wall of the outer cover is provided with the vibrating device, the vibrating device can enable the inner cover to vibrate, the device provided by the invention can prevent a feed inlet of the extruder from being blocked, and the smashing efficiency of the caked materials is further improved.

Description

A extruder feed arrangement for powder coating preparation
Technical Field
The invention relates to the field of extruders, in particular to an extruder feeding device for powder coating preparation.
Background
The extruder is a device which can fully stir and uniformly mix materials in the screw by means of pressure and shearing force generated by the rotation of the screw; in the preparation process of the powder coating, the main materials to be mixed are heated and then enter a screw part of an extruder from a feed inlet of the extruder to be fully stirred and mixed with other raw materials.
Fig. 1 shows the feed inlet part of current extruder, wherein the material gets into from the extruder discharge opening, motor output end below is provided with rabbling mechanism, rabbling mechanism is including pressing close to the stirring end of device lateral wall, the material also can be stirred by the stirring end at the in-process that down falls, when the material is in the position between stirring end and the device lateral wall, the great material of caking is just easily pressed by the stirring end and is smashed to pieces in device lateral wall position, and the material of smashing continues to fall and gets into the screw rod position from the feed inlet below the rabbling mechanism.
The existing stirring mechanism has two defects, namely, when materials are directly poured into an impact feed port from a material pouring port of an extruder, the feed port can be blocked; secondly, the material of caking does not necessarily can follow the clearance process between stirring end and the device lateral wall, probably directly falls to the feed inlet from the intermediate position of rabbling mechanism, and this can lead to stirring end can not contact the caking material of smashing to pieces, and if for promoting the effect that stirring end smashes caking material to pieces and set up comparatively narrowly with feed mechanism, efficiency when will influencing the material feeding.
Disclosure of Invention
The invention provides an extruder feeding device for powder coating preparation, and aims to solve the problems in the background art.
In order to realize the purpose, the invention adopts the following technical scheme to realize the purpose:
a feeding device of an extruder for preparing powder coating comprises a motor, a feeding box, an outer cover and an inner cover, wherein the output end of the motor is connected with a rotating shaft, and the rotating shaft penetrates through the feeding box, the outer cover and the inner cover and is fixedly connected with the inner cover; the feeding box is provided with a material reversing port and a material discharging port, valves are arranged on the material reversing port and the material discharging port to control the material reversing port and the material discharging port to be opened and closed, an annular through hole is formed in the upper end of the inner cover and close to the lower position of the material discharging port, a material guiding portion is further arranged on the rotating shaft and close to the lower position of the annular through hole, and the material guiding portion can guide paint entering from the annular through hole to the inner wall of the inner cover; the inner wall of the inner cover is provided with an inclination angle which can enable the coating to roll down along the inner wall of the inner cover, the inner cover is arranged in the outer cover, a plurality of circles of rolling pieces are rotatably arranged between the inner cover and the outer cover, the rotating shaft is positioned in one section of the inner cover and is also connected with an extrusion part, the extrusion part is arranged close to the inner wall of the inner cover, and the motor can drive the inner cover to rotate relative to the outer cover through the extrusion part and the rolling pieces; a spiral feeding rod is arranged close to the lower part of the extrusion part, and a feeding hole is arranged close to the lower part of the inner cover; the outer wall of the outer cover is provided with a vibrating device which can make the inner cover vibrate.
The raw materials to be mixed enter the feeding box from the material pouring port, and a rotating shaft, a material guiding part, an inner cover, an extruding part and a spiral feeding rod which are connected to the output end of the motor can rotate along with the raw materials under the driving of the motor; raw materials leak from a feed opening below the feeding box and enter the inner cover through the annular through hole on the inner cover; because the motor generates a friction force for driving the inner cover to rotate to the inner cover through the rotating shaft and the extrusion part, and a plurality of circles of rolling pieces are arranged between the inner cover and the outer cover, the inner cover can rotate relative to the outer cover at a speed slower than the rotating speed of the rotating shaft in the outer cover, so that the position of the raw material falling into the inner cover through the annular through hole can be changed continuously; the raw materials are guided by the material guide part to roll down to the side wall of the inner cover, and the side wall of the inner cover has a certain inclination angle so that the raw materials can roll down from the side wall of the inner cover at a speed slower than the free falling speed; when the raw materials roll down along the side wall of the inner cover, the extruding part is arranged close to the inner wall of the inner cover, so that the efficiency of the extruding part for mashing the agglomerated materials is further increased; when the raw material passes through the position of the feeding hole, the raw material enters the feeding hole along the side edge of the feeding hole, so that compared with the prior art that the raw material is directly poured into the feeding hole to pass through the feeding hole, the feeding mode is less prone to blocking the feeding hole; the vibrating device arranged on the outer wall of the outer cover can vibrate the inner cover, so that powder materials bonded on the inner cover are more easily shaken off and fall into the feeding hole.
Furthermore, the extrusion part is connected with the rotating shaft through a connecting piece, the extrusion part is a rotatable roller which is obliquely arranged, the inclination angle of the extrusion part is matched with that of the inner wall of the inner cover, the surface of the extrusion part is provided with a flexible material, and the surface of the extrusion part and the surface of the inner wall of the inner cover are both in a corrugated shape; when the roller rubs the inner wall of the inner cover, the roller can rotate to further increase the efficiency of mashing the caked materials; the surface of the roller and the surface of the inner wall of the inner cover are all arranged to be corrugated, so that the friction force between the roller and the inner cover can be increased, and the falling speed of the raw materials along the side wall of the inner cover can be reduced, so that the roller has more time to smash the caking materials.
Furthermore, the connecting piece is a screw rod, a rotating cover is arranged around the outer ring of the rotating shaft, the connecting piece is in threaded connection with the rotating cover, and the distance between the extrusion part and the inner wall of the inner cover is adjusted by screwing the screw rod into or out of the rotating cover.
Furthermore, an angle adjusting device is arranged between the connecting piece and the extrusion part and used for adjusting the angle of the extrusion part so that the angle of the extrusion part is matched with the angle of the inner wall of the inner cover.
Furthermore, the extruder feeding device also comprises a switch valve, the switch valve can control the opening and closing of the feeding hole, and a drain valve is arranged at a position close to the upper part of the control valve; when will wasing extruder feed arrangement, the ooff valve is closed, through pouring the water injection among the material mouth to extruder feed arrangement, the starter motor, under the motor output drives, pivot, guide portion, inner cover, extrusion portion and spiral feed rod all can follow the rotation, consequently form the vortex in rivers, open the drain valve after a period and make rivers play, treat to open the ooff valve again after the inside moisture evaporation of extruder feed arrangement.
Furthermore, the material pouring blade is connected to a section of the rotating shaft, which is located in the feeding box, and the material pouring blade rotates to push the material in the feeding box to the position of the discharging opening under the driving of the rotating shaft.
Further, be provided with the chute in the guide portion, this chute is used for the guide to drop the material in the guide portion, and it is rotatory to receive pivot drive guide portion, and the material of guide portion top can be thrown away and fall to the inner wall lateral wall by the centrifugal force effect influence this moment.
Furthermore, a hot air blower is arranged at a position close to the material pouring port and used for evaporating moisture left after the feeding device of the extruder is cleaned.
Furthermore, the vibrating device comprises a vibrating plate, a pulse electromagnet is arranged on the vibrating plate, the vibrating plate is connected with a vibrating frame through a spring, the vibrating frame is arranged on an outer cover, the vibrating plate is arranged close to the outer cover, the pulse electromagnet can generate a vibration amplitude under the action of current, the vibration amplitude is transmitted to the vibrating plate through the spring, the vibrating plate impacts the outer cover at intervals to enable the inner cover to generate a vibration amplitude, and due to the fact that a gap exists between the outer cover and the inner cover and the gap is not of an integrated structure, the vibration amplitude of the inner cover can be further increased.
The invention has the beneficial effects that: in the invention, the inner cover rotates in the outer cover at a speed slower than the rotating speed of the rotating shaft, so the position of the raw material falling into the inner cover through the annular through hole can be changed continuously; the side wall of the inner cover has a certain inclination angle to ensure that the raw materials fall from the side wall of the inner cover at a speed slower than the free falling speed, and at the moment, because the extrusion part is also arranged close to the inner wall of the inner cover, the efficiency of the extrusion part for mashing the caking materials is further increased; in addition, when the raw materials pass through the position of the feeding hole, the raw materials enter the feeding hole along the side edge of the feeding hole, and compared with the mode of directly pouring the raw materials into the feeding hole in the prior art, the feeding mode is less prone to blocking the feeding hole; the vibrating device arranged on the outer wall of the outer cover can make the inner cover vibrate, so that the powder materials bonded on the inner cover are more easily shaken off and fall into the feed inlet; the device is convenient to clean through the arrangement of the hot air blower, the drain valve and the switch valve.
Drawings
FIG. 1 is a schematic view of a feed mechanism of an extruder in the prior art;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a partial enlarged view of the present invention;
fig. 4 is a top view of the inner shroud and feed box portion of the present invention.
In the figure: 1. a motor; 2. a feeding box; 3. a housing; 4. an inner cover; 5. a rotating shaft; 6. pouring a material port; 7. a feeding port; 8. an annular through hole; 9. a material guide part; 10. a rolling member; 11. a pressing section; 12. a screw feed rod; 13. a feed inlet; 14. a screw; 15. a rotating cover; 16. an angle adjusting device; 17. an on-off valve; 18. a drain valve; 19. pouring blades; 20. a hot air blower; 21. a vibrating device; 22. a vibrating plate; 23. a pulse electromagnet; 24. a vibration frame; 25. a spring; 26. and (3) feeding.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.
As shown in fig. 2-4, an extruder feeding device for powder coating preparation comprises a motor 1, a feeding box 2, an outer cover 3 and an inner cover 4, wherein the output end of the motor 1 is connected with a rotating shaft 5, and the rotating shaft 5 penetrates through the feeding box 2, the outer cover 3 and the inner cover 4 and is fixedly connected with the inner cover 4; the feeding box 2 is provided with a material reversing port 6 and a material discharging port 7, valves are arranged on the material reversing port 6 and the material discharging port 7 to control the material reversing port 6 and the material discharging port 7 to be opened and closed, an annular through hole 8 is formed in the upper end of the inner cover 4 close to the lower part of the material discharging port 7, a material guiding part 9 is further arranged on the rotating shaft 5 close to the lower part of the annular through hole 8, and the material guiding part 9 can guide the paint entering from the annular through hole 8 to the inner wall of the inner cover 4; the inner wall of the inner cover 4 is provided with an inclination angle which can enable the coating to roll down along the inner wall of the inner cover 4, the inner cover 4 is arranged in the outer cover 3, a plurality of circles of rolling pieces 10 are rotatably arranged between the inner cover and the outer cover, the rotating shaft 5 is positioned in one section of the inner cover 4 and is also connected with an extrusion part 11, the extrusion part 11 is arranged close to the inner wall of the inner cover 4, and the motor 1 can drive the inner cover 4 to rotate relative to the outer cover 3 through the extrusion part 11 and the rolling pieces 10; a spiral feeding rod 12 is arranged close to the lower part of the extrusion part 11, and a feeding hole 13 is arranged close to the lower part of the inner cover 4; the outer wall of the outer cover 3 is provided with a vibration device 21, and the vibration device 21 can make the inner cover 4 vibrate.
The raw materials to be mixed enter the feeding box 2 from the material pouring port 6, and the rotating shaft 5, the material guiding part 9, the inner cover 4, the extruding part 11 and the spiral feeding rod 12 which are connected to the output end of the motor 1 can rotate along with the motor 1; raw materials leak from a feed opening 7 below the feeding box 2 and enter the inner cover 4 through an annular through hole 8 on the inner cover 4; because the motor 1 generates a friction force for driving the inner cover 4 to rotate on the inner cover 4 through the rotating shaft 5 and the extrusion part 11, and the multi-ring rolling piece 10 is arranged between the inner cover 4 and the outer cover 3, at the moment, the inner cover 4 can rotate relative to the outer cover 3 at a speed slower than the rotating speed of the rotating shaft 5 in the outer cover 3, and the position of the raw material falling into the inner cover 4 through the annular through hole 8 can be changed continuously; the raw materials are guided by the material guide part 9 to roll down to the side wall of the inner cover 4, and the side wall of the inner cover 4 has a certain inclination angle so that the raw materials can roll down from the side wall of the inner cover 4 at a speed slower than the free falling speed; when the raw material rolls down along the side wall of the inner cover 4, the efficiency of the extruding part 11 for mashing the agglomerated material 26 is further increased because the extruding part 11 is also arranged close to the inner wall of the inner cover 4; when the raw material passes through the position of the feed opening 13, because the raw material enters the feed opening 13 along the side edge of the feed opening 13, compared with the prior art that the raw material is directly poured through the feed opening 13, the feeding mode is less prone to block the feed opening 13; the vibration means 21 provided on the outer wall of the outer cover 3 vibrates the inner cover 4 so that the powder material 26 adhered to the inner cover 4 is more easily shaken off into the feed port 13, and in the present invention, the vibration amplitude of the inner cover 4 is further increased because there is a gap between the outer cover 3 and the inner cover 4 rather than an integrated structure.
Furthermore, the extrusion part 11 is connected with the rotating shaft 5 through a connecting piece, the extrusion part 11 is a rotatable roller which is obliquely arranged, the inclination angle of the extrusion part 11 is matched with that of the inner wall of the inner cover 4, the surface of the extrusion part 11 is provided with a flexible material, and the surface of the extrusion part 11 and the surface of the inner wall of the inner cover 4 are both in a corrugated shape; when the roller rubs the inner wall of the inner cover 4, the roller can rotate to further increase the efficiency of mashing the caked materials 26; the surface of the roller and the surface of the inner wall of the inner cover 4 are arranged to be corrugated, so that the friction force between the roller and the inner cover 4 can be increased, and the speed of the raw materials falling along the side wall of the inner cover 4 can be reduced, so that the roller has more time to smash the caking materials 26.
Further, the connecting piece is a screw rod 14, a rotating cover 15 is arranged around the rotating shaft 5, the connecting piece is screwed with the rotating cover 15, and the distance between the extrusion part 11 and the inner wall of the inner cover 4 is adjusted by screwing the screw rod 14 into or out of the rotating cover 15.
Further, an angle adjusting device 16 is disposed between the connecting member and the extruding part 11, and the angle adjusting device 16 is used for adjusting the angle of the extruding part 11 so that the angle of the extruding part 11 matches the angle of the inner wall of the inner cover 4.
Further, the extruder feeding device also comprises a switch valve 17, the switch valve 17 can control the opening and closing of the feeding hole 13, and a drain valve 18 is arranged at a position close to the upper part of the control valve; when will wasing extruder feed arrangement, ooff valve 17 closes, through pouring hole 6 water injection in to extruder feed arrangement, starter motor 1, under the drive of motor 1 output, pivot 5, guide portion 9, inner cover 4, extrusion portion 11 and spiral feed rod 12 all can follow the rotation, consequently form the vortex in rivers, open drain valve 18 after a period and make rivers play, treat to open ooff valve 17 after the inside moisture evaporation of extruder feed arrangement again.
Further, the rotating shaft 5 is arranged at one section of the feeding box 2 and is connected with a material pouring blade 19, and the material pouring blade 19 rotates to push the material 26 in the feeding box 2 to the position of the feed opening 7 under the driving of the rotating shaft 5.
Furthermore, a chute is arranged on the material guiding portion 9, and is used for guiding the material 26 falling onto the material guiding portion 9, the material guiding portion 9 is driven by the rotating shaft 5 to rotate, and at the moment, the material 26 above the material guiding portion 9 is influenced by the centrifugal force and can be thrown onto the side wall of the inner wall.
Further, a hot air blower 20 is arranged close to the material pouring opening 6, and the hot air blower 20 is used for evaporating moisture left after the feeding device of the extruder is cleaned.
Further, the vibration device 21 includes a vibration plate 22, the vibration plate 22 is provided with a pulse electromagnet 23, the vibration plate 22 is connected to a vibration frame 24 through a spring 25, the vibration frame 24 is disposed on the outer cover 3, the vibration plate 22 is disposed adjacent to the outer cover 3, the pulse electromagnet 23 generates a vibration amplitude under the action of current, the vibration amplitude is transmitted to the vibration plate 22 through the spring 25, the vibration plate 22 strikes the outer cover 3 at intervals to generate a vibration amplitude for the inner cover 4, and in the present invention, the vibration amplitude of the inner cover 4 is further increased because a gap exists between the outer cover 3 and the inner cover 4 and is not an integrated structure.
The specific working principle of the invention is as follows: the raw materials to be mixed enter the feeding box 2 from the material pouring port 6, and the material pouring blade 19 pushes the raw materials to the position of the feed opening 7 under the driving of the motor 1; raw materials leak from a feed opening 7 below the feeding box 2 and enter the inner cover 4 through an annular through hole 8 on the inner cover 4; as shown in fig. 4 (the arrow direction represents the rotation direction of the inner cover 4), since the inner cover 4 rotates in the outer cover 3, the position where the raw material falls into the inner cover 4 through the annular through hole 8 is constantly changed; the side wall of the inner cover 4 has a certain inclination angle so that the raw material rolls from the side wall of the inner cover 4 at a speed slower than the free falling speed, and when the raw material rolls along the side wall of the inner cover 4, the extrusion part 11 performs a mashing and stirring function on the material 26 under the driving of the motor 1; when the raw material passes through the position of the feed opening 13, because the raw material enters the feed opening 13 along the side edge of the feed opening 13, compared with the prior art that the raw material is directly poured through the feed opening 13, the feeding mode is less prone to block the feed opening 13; the raw material finally enters a screw 14 through a spiral feeding rod 12 and a feeding hole 13; the vibration means 21 provided on the outer wall of the outer cover 3 vibrates the inner cover 4 so that the powder material 26 adhered to the inner cover 4 is more easily shaken off into the feed port 13, and in the present invention, the vibration amplitude of the inner cover 4 is further increased because there is a gap between the outer cover 3 and the inner cover 4 rather than an integrated structure.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims (8)

1. A feeding device of an extruder for preparing powder coating is characterized by comprising a motor, a feeding box, an outer cover and an inner cover, wherein the output end of the motor is connected with a rotating shaft which penetrates through the feeding box, the outer cover and the inner cover and is fixedly connected with the inner cover; the feeding box is provided with a material pouring port and a material discharging port, an annular through hole is formed in the upper end of the inner cover close to the lower position of the material discharging port, a material guiding part is further arranged at the position, close to the lower part of the annular through hole, of the rotating shaft, and the material guiding part can guide paint entering from the annular through hole to the position of the inner wall of the inner cover; the inner wall of the inner cover is provided with an inclination angle which can enable the coating to roll down along the inner wall of the inner cover, the inner cover is arranged in the outer cover, a plurality of circles of rolling pieces are rotatably arranged between the inner cover and the outer cover, the rotating shaft is positioned in one section of the inner cover and is also connected with an extrusion part, and the extrusion part is arranged close to the inner wall of the inner cover; a spiral feeding rod is arranged close to the lower part of the extrusion part, and a feeding hole is arranged close to the lower part of the inner cover; the outer wall of the outer cover is provided with a vibrating device which can make the inner cover vibrate; the extrusion portion is connected with the rotating shaft through a connecting piece, the extrusion portion is a rotatable roller which is obliquely arranged, the inclination angle of the extrusion portion is matched with that of the inner wall of the inner cover, the surface of the extrusion portion is provided with a flexible material, the surface of the extrusion portion and the surface of the inner wall of the inner cover are in a fold shape, the inner cover is driven to rotate through friction force between the extrusion portion and the inner cover when the extrusion portion rotates, and the rotating speed of the extrusion portion is greater than that of the inner cover.
2. The feeding device of extruder for preparing powder coating material as claimed in claim 1, wherein the connecting member is a screw, a rotating cover is arranged around the rotating shaft, and the connecting member is screwed with the rotating cover.
3. The extruder feeding device for powder coating material preparation according to claim 1, wherein an angle adjusting device is provided between the connecting piece and the extrusion part.
4. The extruder feeding device for the preparation of the powder coating according to claim 1, further comprising a switch valve, wherein the switch valve can control the opening and closing of the feeding hole, and a drain valve is arranged near the upper position of the control valve.
5. The feeding device of an extruder for preparing powder coating according to claim 1, wherein the rotating shaft is connected with a material pouring blade at a section of the feeding box.
6. The feeding device of claim 1, wherein the guiding portion is provided with a chute.
7. The extruder feeding device for powder coating preparation of claim 1, wherein a hot air blower is provided adjacent to the pouring opening.
8. The extruder feeding device for powder coating preparation of claim 1, wherein the vibrating device comprises a vibrating plate, the vibrating plate is provided with a pulse electromagnet, the vibrating plate is connected with a vibrating frame through a spring, the vibrating frame is arranged on the outer cover, and the vibrating plate is arranged close to the outer cover.
CN202010936582.XA 2020-09-08 2020-09-08 A extruder feed arrangement for powder coating preparation Active CN112123619B (en)

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