Plastic powder grinding device

Abstract

The present invention relates to the technical field of plastic powder manufacturing, and specifically discloses a plastic powder grinding device, comprising a shell having a accommodating chamber on the top side, a cover body which completely covers the accommodating chamber is installed on the top side of the shell, an exhaust hole is opened in the middle of the cover body, a rotating shaft is installed in the accommodating chamber, a grinding ring is fixed on the inner wall of the accommodating chamber, a plurality of rotating components are installed on the rotating shaft, the rotating component comprises a plate body, one end of the plate body is fixedly connected to the rotating shaft, a grinding block is fixed on the other end of the plate body, and the grinding block is located in the grinding ring, the bottom side of the accommodating chamber gradually tilts downward in a direction away from the rotating shaft, an annular tube is provided on the edge of the bottom side of the accommodating chamber, an annular opening is opened on the top side of the annular tube, the inner cavity of the annular tube is connected to one end of an air inlet pipe, and the other end of the air inlet pipe passes through the shell and extends to the outside of the shell. In the plastic powder grinding device, the plastic powder is air-cooled after being ground to avoid the plastic powder from sticking together, thereby ensuring the plastic powder grinding efficiency and realizing the screening of the plastic powder.

Description

Technical Field

[0001] The invention relates to the technical field of plastic powder manufacturing, in particular to a plastic powder grinding device. Background Art

[0002] Plastic powder is a kind of fine powder, which is mainly divided into two categories: thermoplastic powder coating and thermosetting powder coating. Plastic powder is attached to the surface of the material through electrostatic adsorption or compressed air spraying, and solidifies into a hard coating under high temperature environment. The coating has good hardness and wear resistance.

[0003] Since plastics tend to stick together after being heated, the heat generated during the grinding process of plastic fragments tends to cause the plastic powder to stick together, affecting the quality of the plastic powder. In the prior art, the temperature of the plastic fragments is often lowered to avoid the sticking of the plastic powder. However, if the fineness of the plastic powder does not reach the set fineness, the plastic powder needs to be ground again. Before grinding again, the plastic powder needs to be cooled again, which reduces the grinding efficiency of the plastic powder. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a plastic powder grinding device, in which the plastic powder is air-cooled after being ground to avoid the plastic powder from sticking together, ensuring the plastic powder grinding efficiency and realizing the screening of the plastic powder.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a plastic powder grinding device, comprising a shell having an accommodating chamber on the top side, a cover body that completely covers the accommodating chamber is installed on the top side of the shell, an exhaust hole is opened in the middle of the cover body, a rotating shaft is installed in the accommodating chamber, a driving component that drives the rotating shaft to rotate is installed on the shell, a grinding ring is fixed to the inner wall of the accommodating chamber, and a plurality of rotating components are installed on the rotating shaft.

[0006] The rotating assembly comprises a plate body, one end of the plate body is fixedly connected to the rotating shaft, and a grinding block is fixed to the other end of the plate body, and the grinding block is located in the grinding ring.

[0007] The bottom side of the accommodating cavity gradually tilts downward in a direction away from the rotating shaft. An annular tube is provided at the edge of the bottom side of the accommodating cavity. An annular opening is provided on the top side of the annular tube. The inner cavity of the annular tube is connected to one end of the air intake pipe, and the other end of the air intake pipe passes through the shell and extends outside the shell.

[0008] The shell is provided with a feed opening connected to the accommodating cavity, and the feed opening is connected to the discharge port of the feeding device.

[0009] The feeding device transports the plastic fragments into the accommodating cavity, the end of the air inlet pipe away from the annular pipe is connected to an external air source, the air in the air inlet pipe is ejected from the annular opening to form an annular airflow, and the annular airflow blows toward the inner wall of the grinding ring.

[0010] As a preferred technical solution of the present invention, the inner wall of the grinding ring is provided with a plurality of grooves.

[0011] As a preferred technical solution of the present invention, the feeding device transports the plastic fragments and dry ice into the containing chamber.

[0012] As a preferred technical solution of the present invention, an opening is formed on the plate body, and a shielding member for shielding the opening is provided on the plate body.

[0013] A moving part is installed on the rotating shaft, and the moving part and the shielding part are connected through a connecting part.

[0014] As a preferred technical solution of the present invention, the feed opening is located between the grinding ring and the annular tube.

[0015] As a preferred technical solution of the present invention, the depth of the groove is 1.0-10.0 mm.

[0016] As a preferred technical solution of the present invention, the distance between the grinding block and the grinding ring is 0.5-5.0 mm.

[0017] As a preferred technical solution of the present invention, it also includes a first annular plate and a second annular plate, the outer edge of the first annular plate abuts against the inner wall of the accommodating cavity, the inner edge of the first annular plate abuts against the outer edge of the annular opening, and the height of the first annular plate gradually increases in the direction away from the rotating shaft.

[0018] The outer side edge of the second annular plate abuts against the inner edge of the annular opening, the inner side edge of the second annular plate abuts against the bottom side of the shell, and the height of the second annular plate gradually decreases in a direction away from the rotating shaft.

[0019] As a preferred technical solution of the present invention, it also includes a baffle plate located below the exhaust hole, and the bottom side of the cover body and the baffle plate are connected via a fixing frame.

[0020] As a preferred technical solution of the present invention, the plate body is fixedly connected to one end of the rod body, and the other end of the rod body is close to the annular tube.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The plastic powder grinding device of the example of the present invention, on the one hand, the annular airflow blows the plastic fragments falling on the bottom side of the accommodating chamber to the inner wall of the grinding ring, the grinding block and the grinding ring grind the plastic fragments, the upward airflow generated by the annular airflow drives the plastic powder generated by the grinding to move upward, and the upward airflow rotates around the rotating shaft during the rotation of the plate body, and the upward airflow is discharged through the exhaust hole. The upward airflow cools the plastic powder generated by the grinding to prevent the plastic powder from sticking together. The centrifugal force on the large volume of plastic powder at the exhaust hole is greater than the force of the airflow on the plastic powder, and the large volume of plastic powder moves downward to achieve plastic powder screening; on the other hand, the staff adjusts the position of the moving part on the rotating shaft to change the area of ​​the opening blocked by the moving part, thereby adjusting the rotation speed of the upward airflow in the accommodating chamber, and the plastic powder screening fineness is convenient to adjust.

[0023] 2. In the plastic powder grinding device of the example of the present invention, on the one hand, when the grinding block moves to the groove, some of the plastic fragments accumulated on the grinding block enter the groove, so that the plastic fragments accumulated on the grinding block are replaced, thereby preventing the plastic fragments accumulated on the grinding block from overheating and sticking; on the other hand, the feeding device transports the plastic fragments and dry ice into the accommodating chamber, and when the grinding block leaves the groove, the grinding block squeezes the dry ice between the grinding block and the edge of the groove, causing the dry ice to sublime rapidly, and the carbon dioxide gas generated by the sublimation of the dry ice expands rapidly to form a micro-explosion effect, thereby causing the plastic powder adhered to the grinding block to detach, and the sublimation of the dry ice reduces the temperature of the grinding block, thereby achieving cooling of the grinding block.

[0024] 3. In the plastic powder grinding device of the example of the present invention, the feed opening is located between the grinding ring and the annular tube, and the iron impurities or stone impurities remain on the bottom side of the accommodating cavity to prevent the iron impurities or stone impurities from damaging the grinding ring or grinding block. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0026] Figure 2 It is a partial cross-sectional structural schematic diagram of the present invention;

[0027] Figure 3 for Figure 2 A schematic diagram of the structure at A;

[0028] Figure 4 for Figure 2 A schematic diagram of the structure at B;

[0029] Figure 5 It is a schematic diagram of the top view of the shell structure of the present invention.

[0030] In the figure: 1 cover body, 2 shell body, 3 feeding device, 4 air inlet pipe, 5 rotating shaft, 6 grinding ring, 7 plate body, 8 grinding block, 9 driving assembly, 10 moving part, 11 connecting part, 12 shielding part, 13 opening, 14 feeding opening, 15 first annular plate, 16 annular pipe, 17 second annular plate, 18 rod body. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] See also Figure 1-5 The present embodiment discloses a plastic powder grinding device, including a shell 2 with a accommodating chamber on the top side, a cover body 1 that completely covers the accommodating chamber is installed on the top side of the shell 2, an exhaust hole is opened in the middle of the cover body 1, a vertically rotating shaft 5 is installed in the accommodating chamber, a driving component 9 that drives the rotating shaft 5 to rotate is installed on the shell 2, a grinding ring 6 is fixed to the inner wall of the accommodating chamber, and a plurality of rotating components are installed on the rotating shaft 5.

[0034] The rotating assembly includes a plate body 7 , one end of which is fixedly connected to the rotating shaft 5 , and the other end of the plate body 7 is fixed with a grinding block 8 , and the grinding block 8 is located in the grinding ring 6 .

[0035] The bottom side of the accommodating cavity gradually tilts downward in a direction away from the rotating shaft 5. An annular tube 16 is provided on the edge of the bottom side of the accommodating cavity. An annular opening is provided on the top side of the annular tube 16. The inner cavity of the annular tube 16 is connected to one end of the air intake pipe 4. The other end of the air intake pipe 4 passes through the shell 2 and extends outside the shell 2.

[0036] The shell 2 is provided with a feed opening 14 connected to the accommodating cavity, and the feed opening 14 is connected to the discharge port of the feeding device 3 .

[0037] Furthermore, the feeding device 3 is a screw conveyor, a tube chain conveyor or a positive pressure pneumatic conveying device in the prior art.

[0038] Furthermore, the driving assembly is an electric motor or a hydraulic motor in the prior art.

[0039] Furthermore, the distance between the grinding block 8 and the grinding ring 6 is 0.5-5.0 mm.

[0040] The working process and principle of this embodiment are:

[0041] The staff uses the feeding device 3 to transport the plastic fragments into the accommodating chamber, and the end of the air inlet pipe 4 away from the annular tube 16 is connected to the external air source. The staff uses the external air source to continuously input air into the annular tube 16 through the air inlet pipe 4. The air in the air inlet pipe 4 is ejected from the annular opening to form an annular airflow, and the annular airflow blows toward the inner wall of the grinding ring 6. The annular airflow blows the plastic fragments that fall on the bottom side of the accommodating chamber toward the inner wall of the grinding ring 6.

[0042] The staff operates the driving assembly 9, which drives the plate body 7 and the grinding block 8 to rotate through the rotating shaft 5. The grinding block 8 and the grinding ring 6 grind the plastic fragments. The upward airflow generated by the annular airflow drives the plastic powder produced by the grinding to move upward, and the upward airflow rotates around the rotating shaft 5 during the rotation of the plate body 7. The upward airflow is discharged through the exhaust hole. The upward airflow cools the plastic powder produced by the grinding to prevent the plastic powder from sticking together.

[0043] The centrifugal force exerted on the large-volume plastic powder at the exhaust hole is greater than the force exerted by the airflow on the plastic powder, and the large-volume plastic powder moves downward, thereby achieving the screening of the plastic powder.

[0044] Furthermore, the external gas source is an air pump or a compressed gas tank.

[0045] Embodiment 2:

[0046] like Figure 2 As shown, this embodiment discloses a plastic powder grinding device, and its structure is substantially the same as that of the first embodiment, except that a plurality of grooves are provided on the inner wall of the grinding ring 6 of this embodiment.

[0047] Furthermore, the depth of the groove in this embodiment is 1.0-10.0 mm.

[0048] The working process and principle of this embodiment are:

[0049] The driving assembly 9 drives the grinding block 8 to rotate through the rotating shaft 5 and the plate body 7. Plastic fragments are accumulated on one side of the rotation direction of the grinding block 8. When the grinding block 8 moves to the groove, some of the plastic fragments accumulated on the grinding block 8 enter the groove, so that the plastic fragments accumulated on the grinding block 8 are replaced, thereby preventing the plastic fragments accumulated on the grinding block 8 from overheating and sticking.

[0050] Embodiment three:

[0051] like Figure 1 , 2 As shown, this embodiment discloses a plastic powder grinding device, and its structure is substantially the same as that of the second embodiment, except that the feeding device 3 of this embodiment conveys plastic fragments and dry ice into the containing chamber.

[0052] Furthermore, the volume ratio of the plastic fragments to the dry ice is 10.0-300.0:1.0.

[0053] The working process and principle of this embodiment are:

[0054] The driving assembly 9 drives the grinding block 8 to rotate through the rotating shaft 5 and the plate body 7. Plastic fragments and dry ice are accumulated on one side of the rotation direction of the grinding block 8. When the grinding block 8 moves to the groove, the groove is filled with plastic fragments and dry ice. When the grinding block 8 leaves the groove, the grinding block 8 squeezes the dry ice between the grinding block 8 and the edge of the groove, causing the dry ice to sublime rapidly. The carbon dioxide gas generated by the sublimation of the dry ice expands rapidly to form a micro-explosion effect, which causes the plastic powder adhered to the grinding block 8 to detach. The sublimation of the dry ice reduces the temperature of the grinding block 8, thereby cooling the grinding block 8, as well as cooling the plastic fragments and plastic powder.

[0055] Preferably, the exhaust hole on the cover body 1 is connected to the air inlet of the external cyclone dust collector, the air outlet of the external cyclone dust collector is connected to the air inlet of the external air pump, the air outlet of the external air pump is connected to the end of the air inlet pipe 4 away from the annular tube 16, the external air pump transports the air in the external cyclone dust collector into the air inlet pipe 4, the sublimated dry ice reduces the oxygen concentration in the accommodating chamber, reduces the risk of plastic powder explosion in the accommodating chamber, improves the safety of the plastic powder grinding device, and the external cyclone dust collector separates the plastic powder from the airflow.

[0056] Embodiment 4:

[0057] like Figure 2 , 3 As shown, this embodiment discloses a plastic powder grinding device, and its structure is substantially the same as that of the third embodiment, except that an opening 13 is provided on the plate body 7 of this embodiment, and a shielding member 12 for shielding the opening 13 is provided on the plate body 7.

[0058] A moving member 10 is installed on the rotating shaft 5 , and the moving member 10 and the shielding member 12 are connected via a connecting member 11 .

[0059] Furthermore, the moving member 10 can slide along the length direction of the rotating shaft 5, and the moving member 10 is fixed on the rotating shaft 5 by bolts or clamps.

[0060] Furthermore, the moving member 10 is a shielding plate or a shielding cover.

[0061] The working process and principle of this embodiment are:

[0062] The staff adjusts the position of the moving member 10 on the rotating shaft 5 to change the area of ​​the opening 13 blocked by the moving member 10, thereby adjusting the rotation speed of the upward airflow in the accommodating chamber, and the fineness of the plastic powder screening can be easily adjusted.

[0063] The larger the area of ​​the opening 13 blocked by the moving member 10 is, the finer the plastic powder discharged from the exhaust hole of the cover body 1 is.

[0064] Embodiment five:

[0065] like Figure 2 , 4 As shown, this embodiment discloses a plastic powder grinding device, and its structure is substantially the same as that of the second embodiment, except that the feed opening 14 of this embodiment is located between the grinding ring 6 and the annular tube 16 .

[0066] The working process and principle of this embodiment are:

[0067] When iron impurities or stone impurities are mixed in the plastic fragments, the density of the iron impurities or stone impurities is greater than the density of the plastic fragments, and the iron impurities or stone impurities remain on the bottom side of the accommodating cavity to prevent the iron impurities or stone impurities from damaging the grinding ring 6 or the grinding block 8.

[0068] Embodiment six:

[0069] like Figure 2 , 4 As shown, this embodiment discloses a plastic powder grinding device, and its structure is substantially the same as that of the first embodiment, except that this embodiment further includes a first annular plate 15 and a second annular plate 17, the outer side edge of the first annular plate 15 abuts against the inner wall of the accommodating cavity, the inner side edge of the first annular plate 15 abuts against the outer edge of the annular opening, and the height of the first annular plate 15 gradually increases in the direction away from the rotating shaft 5.

[0070] The outer side of the second annular plate 17 abuts against the inner side of the annular opening, the inner side of the second annular plate 17 abuts against the bottom side of the housing 2 , and the height of the second annular plate 17 gradually decreases in the direction away from the rotating shaft 5 .

[0071] The working process and principle of this embodiment are:

[0072] The first annular plate 15 and the second annular plate 17 are both fixed in the accommodating chamber. The first annular plate 15 and the second annular plate 17 move the plastic fragments falling downward toward the annular opening, and the annular airflow ejected from the annular opening moves the plastic fragments toward the inner wall of the grinding ring 6, thereby reducing the plastic fragments accumulated on the bottom side of the accommodating chamber and improving the grinding efficiency of the plastic powder grinding device for the plastic fragments.

[0073] Embodiment seven:

[0074] like Figure 2 As shown, this embodiment discloses a plastic powder grinding device, and its structure is substantially the same as that of the first embodiment, except that this embodiment further includes a baffle located below the exhaust hole, and the bottom side of the cover body 1 and the baffle are connected via a fixing frame, and the baffle enables the airflow entering the exhaust hole of the cover body 1 to move horizontally in a spiral manner, thereby improving the effect of plastic powder screening.

[0075] Embodiment eight:

[0076] like Figure 2 , 4 As shown, this embodiment discloses a plastic powder grinding device, whose structure is roughly the same as that of the first embodiment, except that the plate body 7 of this embodiment is fixedly connected to one end of the rod body 18, and the other end of the rod body 18 is close to the annular tube 16.

[0077] The working process and principle of this embodiment are:

[0078] The rod body 18 rotates with the plate body 7, and the rod body 18 hits the plastic fragments on the annular tube 16, so that the plastic fragments are evenly distributed on the bottom side of the accommodating cavity.

[0079] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A plastic powder grinding device, characterized in that: It comprises a shell (2) with a receiving cavity on the top side, a cover (1) which completely covers the receiving cavity is installed on the top side of the shell (2), an exhaust hole is opened in the middle of the cover (1), a rotating shaft (5) is installed in the receiving cavity, a driving component (9) which drives the rotating shaft (5) to rotate is installed on the shell (2), a grinding ring (6) is fixed to the inner wall of the receiving cavity, and a plurality of rotating components are installed on the rotating shaft (5); The rotating assembly comprises a plate body (7), one end of the plate body (7) is fixedly connected to the rotating shaft (5), and a grinding block (8) is fixed to the other end of the plate body (7), and the grinding block (8) is located in the grinding ring (6); The bottom side of the accommodating cavity is gradually inclined downward in a direction away from the rotating shaft (5); an annular tube (16) is provided at the edge of the bottom side of the accommodating cavity; an annular opening is provided at the top side of the annular tube (16); the inner cavity of the annular tube (16) is connected to one end of the air inlet pipe (4); the other end of the air inlet pipe (4) passes through the shell (2) and extends to the outside of the shell (2); The shell (2) is provided with a feed opening (14) connected to the accommodating cavity, and the feed opening (14) is connected to the discharge port of the feeding device (3); The inner wall of the grinding ring (6) is provided with a plurality of grooves; The plate body (7) is provided with an opening (13), the plate body (7) is provided with a shielding member (12) for shielding the opening (13), a moving member (10) is mounted on the rotating shaft (5), and the moving member (10) and the shielding member (12) are connected via a connecting member (11); It also comprises a first annular plate (15) and a second annular plate (17), wherein the outer side edge of the first annular plate (15) abuts against the inner wall of the accommodating cavity, the inner side edge of the first annular plate (15) abuts against the outer edge of the annular opening, and the height of the first annular plate (15) gradually increases in a direction away from the rotating shaft (5); The outer side edge of the second annular plate (17) abuts against the inner side edge of the annular opening, the inner side edge of the second annular plate (17) abuts against the bottom side of the housing (2), and the height of the second annular plate (17) gradually decreases in a direction away from the rotating shaft (5); The feeding device (3) conveys the plastic fragments into the containing chamber, the end of the air inlet pipe (4) away from the annular pipe (16) is connected to an external air source, the air in the air inlet pipe (4) is ejected from the annular opening to form an annular airflow, and the annular airflow is blown toward the inner wall of the grinding ring (6); The feeding device (3) transports the plastic fragments and dry ice into the containing chamber.

2. The plastic powder grinding device according to claim 1, characterized in that: The feed opening (14) is located between the grinding ring (6) and the annular tube (16).

3. The plastic powder grinding device according to claim 1, characterized in that: The depth of the groove is 1.0-10.0 mm.

4. The plastic powder grinding device according to claim 1, characterized in that: The distance between the grinding block (8) and the grinding ring (6) is 0.5-5.0 mm.

5. The plastic powder grinding device according to claim 1, characterized in that: It also comprises a baffle plate located below the exhaust hole, and the bottom side of the cover body (1) and the baffle plate are connected via a fixing frame.

6. The plastic powder grinding device according to claim 1, characterized in that: The plate body (7) is fixedly connected to one end of the rod body (18), and the other end of the rod body (18) is close to the annular tube (16).

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