A plastic powder feeding device

Abstract

The present invention provides a plastic powder feeding device, which relates to the field of plastic powder processing technology. The plastic powder feeding device comprises a box, a reciprocating mechanism, an adjusting mechanism, a screening mechanism and a conveying mechanism. The output end of the reciprocating mechanism is provided with a connecting gear, the upper side of the connecting gear is meshedly connected with a first rack fixedly connected to the inner wall of the box, the lower side of the connecting gear is meshedly connected with a second rack slidably connected to the inner wall of the box, the right end of the second rack is fixedly connected with a dividing hopper, the interior of the box is provided with two synchronous and reversely rotating crushing rollers, the adjusting mechanism drives the two crushing rollers to adjust the spacing, the inner bottom side of the box is provided with an upper screen plate and a lower screen plate, the screening mechanism drives the upper screen plate and the lower screen plate to reciprocate synchronously and reversely, and realizes the adjustment of the moving distance. The present invention can crush and screen materials while ensuring the linkage of the overall device, and the subsequent feeding effect is good.

Description

Technical Field

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

[0002] Plastic powder is the mainstream coating raw material nowadays, with good spraying effect, low cost, bright color and beautiful appearance. When processing plastic powder, the plastic powder raw material needs to be continuously poured into the processing machine for further processing.

[0003] For the processing of plastic powder, the raw material (plastic) needs to be placed in the machine for crushing and screening to ensure the particle size of the plastic powder. In the prior art, during the crushing process, since the spacing of the crushing rollers is consistent, it is impossible to perform adaptive adjustment according to the required particle size. Even if some devices have the function of adjustment, they cannot ensure the linkage of the device during the adjustment process, which can easily cause the device to get stuck and fail, and can no longer be processed;

[0004] Secondly, during the screening process, since the aperture sizes between the sieve plates are consistent, it is impossible to adaptively adjust according to the actual required particle size. Even if some devices have the adjustment function, most of them only adapt the aperture during the adjustment process. However, in the actual screening process, the linkage and efficiency of the screening cannot be guaranteed. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a plastic powder feeding device, which solves the problem that the crushing and screening processes cannot be linked.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a plastic powder feeding device, comprising a box, a reciprocating mechanism, an adjusting mechanism, a screening mechanism and a conveying mechanism, the upper surface of the box is provided with a feeding port, the reciprocating mechanism is arranged at the upper left part of the box, the output end of the reciprocating mechanism is provided with a reciprocating connecting gear, the upper side of the connecting gear is meshedly connected with a first rack fixedly connected to the inner wall of the box, the lower side of the connecting gear is meshedly connected with a second rack slidably connected to the inner wall of the box, the right end of the second rack is fixedly connected with a distribution hopper, and the distribution hopper is connected to the feeding port through a soft sleeve;

[0009] The adjustment mechanism is arranged in the middle of the left side of the box body, and two crushing rollers rotating synchronously and in opposite directions are arranged in the middle of the box body, and the adjustment mechanism drives the two crushing rollers to adjust the spacing;

[0010] The screening mechanism is arranged at the left bottom of the box body, and an upper screen plate and a lower screen plate are arranged on the inner bottom side of the box body. The screening mechanism drives the upper screen plate and the lower screen plate to move synchronously and reversely, and realizes the adjustment of the moving distance;

[0011] It also includes a conveying mechanism for returning the material on the upper surface of the upper screen plate, and the output end of the conveying mechanism guides the material back to the feed inlet through a conduit;

[0012] A feeding port is arranged at the middle side of the bottom of the box body, supporting legs are arranged at the four corners of the bottom of the box body, and an observation window is arranged at the front side of the box body.

[0013] Preferably, the reciprocating mechanism includes a first connecting frame fixedly connected to the left outer surface of the box body, a driving motor is arranged inside the first connecting frame, the output end of the driving motor is fixedly connected to the first turntable, the outer surface of the first turntable is rotatably connected to the first connecting rod on the outside, the right end of the first connecting rod is rotatably connected to the first slide, the right side of the first slide is fixedly connected to the first guide rod, and the connecting gear is rotatably connected to the right side of the first guide rod.

[0014] Preferably, the adjustment mechanism includes a second connecting frame fixedly connected to the left outer surface of the box body, the outer surface of the second connecting frame is fixedly connected to an adjusting motor, the output end of the adjusting motor passes through the interior of the second connecting frame, and is connected to a bidirectional threaded rod through a first bevel gear set, the outer walls on both sides of the bidirectional threaded rod are threadedly connected to thread blocks, the outer surfaces of the two threaded blocks are rotatably connected to a rotating rod, and the two crushing rollers are respectively fixedly connected to the right ends of the rotating rod.

[0015] Preferably, one side of the rotating rod is rotatably connected to a telescopic rod via a second bevel gear set, and a sleeve rod that rotates synchronously with the telescopic rod is slidably sleeved on the outer wall of the telescopic rod;

[0016] The middle outer wall of the sleeve rod is rotatably connected to the first connecting rod through the third bevel gear set, and the upper end of the first connecting rod is connected to the output end of the driving motor through the fourth bevel gear set;

[0017] The middle outer wall of the sleeve rod is rotatably connected to the second connecting rod through the fifth bevel gear set, and the bottom of the second connecting rod is rotatably connected to the rotating shaft through the sixth bevel gear set.

[0018] Preferably, the outer wall of the telescopic rod is fixedly connected to a limiting block, and the limiting block is slidably engaged with the inner wall of the sleeve rod;

[0019] It also includes a connecting frame, one end of which is fixedly connected to a first bearing seat for connecting the threaded block and the rotating rod, and the other end of which is fixedly connected to a second bearing seat sleeved on the outer wall of the telescopic rod;

[0020] It also includes a fixing rod fixedly connected to the outer surface of the box body, and the other end of the fixing rod is fixedly connected to a positioning bearing seat sleeved on the outer wall of the sleeve rod.

[0021] Preferably, the screening mechanism includes a third connecting frame fixedly connected to the left outer surface of the box body, the upper inner wall of the third connecting frame is fixedly connected to a fixed frame, the interior of the fixed frame is rotatably connected to a rotating shaft, the outer end of the rotating shaft is fixedly connected to a second turntable, the outer surface of the second turntable is rotatably connected to a second connecting rod on the outer side, the bottom of the second connecting rod is rotatably connected to a second slide plate, the bottom of the second slide plate is fixedly connected to a second guide rod, and the bottom of the second guide rod is slidably connected to a connecting plate via a positioning block;

[0022] The front side of the connecting plate is provided with a first positioning bolt and a second positioning bolt, and the first positioning bolt and the second positioning bolt are respectively adapted to the thread of the positioning block.

[0023] Preferably, a left rack is fixedly connected to the left side of the bottom of the connecting plate, and an outer cylinder is meshedly connected to the right side of the left rack, a right rack is fixedly connected to the right side of the bottom of the connecting plate, and an inner cylinder is meshedly connected to the left side of the right rack, the outer cylinder and the inner cylinder are coaxial, and a positioning rod fixedly connected to the third connecting frame is fixedly connected in the middle.

[0024] Preferably, the upper side of the outer cylinder is meshedly connected with an upper rack fixedly connected to the upper sieve plate, and the lower side of the outer cylinder is meshedly connected with a lower rack fixedly connected to the lower sieve plate.

[0025] Preferably, partitions are fixedly connected to the inner walls on both sides of the box body, a connecting pipe is arranged on the rear side of the interior of the box body, a plurality of feed covers are arranged at the bottom of the connecting pipe, and the connecting pipe is connected to the conveying mechanism through a negative pressure pump.

[0026] Preferably, the conveying mechanism includes a conveyor fixedly connected to the right outer surface of the box body, the upper surface of the conveyor is fixedly connected to a conveying motor, the output end of the conveying motor passes through the interior of the conveyor and is fixedly connected to a conveying blade.

[0027] (III) Beneficial effects

[0028] The present invention provides a plastic powder feeding device having the following beneficial effects:

[0029] 1. A reciprocating mechanism, a connecting gear, a first rack, a second rack and a material distribution hopper are provided. Under the reciprocating movement of the reciprocating mechanism, the connecting gear can be driven to reciprocate. Under the transmission action of the first rack, the second rack can be driven to perform extended-range reciprocating movement, thereby expanding the moving range of the material distribution hopper within a limited range, and evenly dispersing the materials to avoid blockage.

[0030] 2. An adjustment mechanism is provided, which drives the bidirectional threaded rod to rotate by adjusting the driving action of the motor, and then drives the two threaded blocks to move toward each other, so that the distance between the two crushing rollers can be adjusted to adapt to the processing of particles of different sizes. Secondly, during the adjustment process, the power source can be kept unaffected to ensure the overall linkage.

[0031] 3. A screening mechanism is provided to further adjust the moving range of the upper and lower screen plates while ensuring the consistency of the power source. On the one hand, the aperture can be adjusted, and on the other hand, the screening efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 It is a schematic cross-sectional view of the box body of the present invention;

[0034] Figure 3 It is a schematic diagram of the reciprocating mechanism of the present invention;

[0035] Figure 4 It is a schematic top view of the box body of the present invention;

[0036] Figure 5 It is a top view schematic diagram of the adjustment mechanism of the present invention;

[0037] Figure 6 It is a schematic diagram of the connection between the telescopic rod and the sleeve rod of the present invention;

[0038] Figure 7 For the present invention Figure 6 A schematic diagram of the structure enlarged at B in the middle;

[0039] Figure 8 It is a side view connection diagram of the first connection frame, the second connection frame and the fixed frame of the present invention;

[0040] Fig. 9 For the present invention Figure 1 A schematic diagram of the structure enlargement at the center A;

[0041] Fig.10 It is a schematic diagram of the screening mechanism of the present invention.

[0042] Among them, 1. box body; 2. feeding port; 3. reciprocating mechanism; 4. connecting gear; 5. first rack; 6. second rack; 7. material distribution hopper; 8. adjustment mechanism; 9. crushing roller; 10. screening mechanism; 11. upper screen plate; 12. lower screen plate; 13. connecting pipe; 14. feeding cover; 15. conveying mechanism; 16. conduit; 17. partition; 18. feeding port; 19. supporting leg; 20. observation window;

[0043] 301, first connection frame; 302, driving motor; 303, first turntable; 304, first connection rod; 305, first slide plate; 306, first guide rod;

[0044] 801, second connecting frame; 802, regulating motor; 803, first bevel gear set; 804, bidirectional threaded rod; 805, threaded block; 806, connecting frame; 8061, first bearing seat; 8062, second bearing seat; 807, rotating rod; 808, second bevel gear set; 809, telescopic rod; 810, sleeve rod; 811, limit block; 812, positioning bearing seat; 813, fixing rod; 814, third bevel gear set; 815, first linkage rod; 816, fourth bevel gear set; 817, fifth bevel gear set; 818, second linkage rod; 819, sixth bevel gear set; 820, rotating shaft;

[0045] 1001, third connecting frame; 1002, fixed frame; 1003, second turntable; 1004, second connecting rod; 1005, second slide plate; 1006, second guide rod; 1007, positioning block; 1008, connecting plate; 1009, left rack; 1010, right rack; 1011, outer cylinder; 1012, inner cylinder; 1013, positioning rod; 1014, upper rack; 1015, lower rack; 1016, first positioning bolt; 1017, second positioning bolt; 1501, conveyor; 1502, conveying motor; 1503, conveying blade. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Example:

[0048] like Figure 1-10As shown, an embodiment of the present invention provides a plastic powder feeding device, including a box body 1, a reciprocating mechanism 3, an adjusting mechanism 8, a screening mechanism 10 and a conveying mechanism 15. A feeding port 2 is provided on the upper surface of the box body 1, and the reciprocating mechanism 3 is arranged at the upper left part of the box body 1. A reciprocating connecting gear 4 is provided at the output end of the reciprocating mechanism 3. Specifically, the reciprocating mechanism 3 includes a first connecting frame 301 fixedly connected to the outer surface of the left side of the box body 1, and a driving motor 302 is arranged inside the first connecting frame 301 (which serves as the power source of the entire device, which will be explained one by one below), and a first turntable 303 is fixedly connected to the output end of the driving motor 302. The outer surface of the first turntable 303 is rotatably connected to the first connecting rod 304 on the outer side, and the right end of the first connecting rod 304 is rotatably connected to the first slide plate 305, and the right side of the first slide plate 305 is fixedly connected to the first guide rod 306, and the connecting gear 4 is rotatably connected to the right side of the first guide rod 306.

[0049] The above structure drives the first rotating disk 303 to rotate under the driving action of the driving motor 302, and drives the first sliding plate 305 to move back and forth left and right under the connecting action of the first connecting rod 304, thereby driving the first guide rod 306 to move back and forth left and right.

[0050] Secondly, the upper side of the connecting gear 4 is meshedly connected with a first rack 5 fixedly connected to the inner wall of the box body 1, and the lower side of the connecting gear 4 is meshedly connected with a second rack 6 slidably connected to the inner wall of the box body 1. The right end of the second rack 6 is fixedly connected to a distribution hopper 7, and the distribution hopper 7 is connected to the feed port 2 through a soft sleeve.

[0051] In combination with the above, under the reciprocating movement of the reciprocating mechanism 3, the connecting gear 4 can be driven to move reciprocatingly, and under the transmission action of the first rack 5, the second rack 6 can be driven to move reciprocatingly with an extended range, thereby expanding the moving range of the distribution hopper 7 within a limited range, and evenly dispersing the material to avoid blockage.

[0052] The adjusting mechanism 8 is arranged in the middle of the left side of the box body 1. Two synchronously and counter-rotating crushing rollers 9 are arranged on the inner middle side of the box body 1. The adjusting mechanism 8 drives the two crushing rollers 9 to adjust the spacing. Specifically, the adjusting mechanism 8 includes a second connecting frame 801 fixedly connected to the outer surface of the left side of the box body 1. The outer surface of the second connecting frame 801 is fixedly connected to the adjusting motor 802. The output end of the adjusting motor 802 passes through the interior of the second connecting frame 801 and is connected to a bidirectional threaded rod 804 through a first bevel gear set 803. The outer walls on both sides of the bidirectional threaded rod 804 are threadedly connected to thread blocks 805. The outer surfaces of the two thread blocks 805 are rotatably connected to rotating rods 807. The two crushing rollers 9 are respectively fixedly connected to the right ends of the rotating rods 807.

[0053] The above structure, under the driving action of the adjusting motor 802, drives the bidirectional threaded rod 804 to rotate, and then drives the two threaded blocks 805 to move toward each other, so that the distance between the two crushing rollers 9 can be adjusted to adapt to the processing of particles of different sizes.

[0054] Secondly, one side of the rotating rod 807 is rotatably connected to the telescopic rod 809 through the second bevel gear set 808, and the outer wall of the telescopic rod 809 is slidably sleeved with a sleeve rod 810 that rotates synchronously with the telescopic rod 809. Specifically, the outer wall of the telescopic rod 809 is fixedly connected to a limiting block 811, and the limiting block 811 is slidably engaged with the inner wall of the sleeve rod 810, thereby ensuring that the telescopic rod 809 can slide inside the sleeve rod 810 and maintain the synchronous rotation of the two; secondly, the device also includes a connecting frame 806, one end of the connecting frame 806 is fixedly connected to a first bearing seat 8061 for connecting the threaded block 805 and the rotating rod 807, and the other end of the connecting frame 806 is fixedly connected to a second bearing seat 8062 sleeved on the outer wall of the telescopic rod 809, which plays a role in positioning connection; secondly, the device also includes a fixed rod 813 fixedly connected to the outer surface of the box body 1, and the other end of the fixed rod 813 is fixedly connected to a positioning bearing seat 812 sleeved on the outer wall of the sleeve rod 810, which also plays a role in positioning connection.

[0055] The middle outer wall of the sleeve rod 810 is rotatably connected to the first connecting rod 815 through the third bevel gear set 814 , and the upper end of the first connecting rod 815 is further connected to the output end of the driving motor 302 through the fourth bevel gear set 816 .

[0056] The above structure allows the driving force of the driving motor 302 to continue to act on the sleeve rod 810, thereby ensuring the normal synchronous operation of the crushing roller 9 and achieving a linkage effect.

[0057] The middle outer wall of the sleeve rod 810 is rotatably connected to the second connecting rod 818 through the fifth bevel gear set 817 , and the bottom of the second connecting rod 818 is rotatably connected to the rotating shaft 820 through the sixth bevel gear set 819 .

[0058] In combination with the above, the driving force of the driving motor 302 is further transmitted downward and combined with the following structure to achieve synchronous operation.

[0059] The screening mechanism 10 is arranged at the left bottom of the box body 1, and an upper screen plate 11 and a lower screen plate 12 are arranged on the inner bottom side of the box body 1, and a plurality of screen holes are opened in the upper screen plate 11 and the lower screen plate 12. The screening mechanism 10 drives the upper screen plate 11 and the lower screen plate 12 to move synchronously and reversely, and adjusts the moving distance. Specifically, the screening mechanism 10 includes a third connecting frame 1001 fixedly connected to the left outer surface of the box body 1, and the upper inner wall of the third connecting frame 1001 is fixedly connected to a fixed frame 1002, and the interior of the fixed frame 1002 is rotatably connected to a rotating shaft 820, and the outer end of the rotating shaft 820 is fixedly connected to the rotating shaft 820. A second turntable 1003 is fixedly connected, and a second connecting rod 1004 is rotatably connected to the outer surface of the second turntable 1003, and a second slide plate 1005 is rotatably connected to the bottom of the second connecting rod 1004. The bottom of the second slide plate 1005 is fixedly connected to a second guide rod 1006, and the bottom of the second guide rod 1006 is slidably connected to a connecting plate 1008 via a positioning block 1007. The front of the connecting plate 1008 is provided with a first positioning bolt 1016 and a second positioning bolt 1017, and the first positioning bolt 1016 and the second positioning bolt 1017 are respectively threadedly adapted to the positioning block 1007.

[0060] The above structure, through the driving force of the driving motor 302, continues to act on the rotating shaft 820 to make it rotate, thereby driving the second turntable 1003 to rotate, and under the connecting action of the second connecting rod 1004, drives the second slide plate 1005 to move back and forth up and down, and then drives the second guide rod 1006 and the connecting plate 1008 to move back and forth up and down. Secondly, the connecting plate 1008 can be positioned after the adjusted position by the first positioning bolt 1016 and the second positioning bolt 1017.

[0061] Furthermore, a left rack 1009 is fixedly connected to the left side of the bottom of the connecting plate 1008, and the right side of the left rack 1009 is meshedly connected to the outer cylinder 1011. A right rack 1010 is fixedly connected to the right side of the bottom of the connecting plate 1008, and the left side of the right rack 1010 is meshedly connected to the inner cylinder 1012. The outer cylinder 1011 and the inner cylinder 1012 are coaxial, and a positioning rod 1013 fixedly connected to the third connecting frame 1001 is fixedly connected in the middle for positioning.

[0062] Furthermore, an upper rack 1014 fixedly connected to the upper sieve plate 11 is meshedly connected to the upper side of the outer cylinder 1011 , and a lower rack 1015 fixedly connected to the lower sieve plate 12 is meshedly connected to the lower side of the outer cylinder 1011 .

[0063] In combination with the above, the connecting plate 1008 moves rightward, so that the left rack 1009 meshes with the outer cylinder 1011, and the right rack 1010 is now separated from the inner cylinder 1012. Under the up and down reciprocating movement of the connecting plate 1008, the outer cylinder 1011 can be driven to reciprocate, thereby driving the upper screen plate 11 and the lower screen plate 12 to reciprocate synchronously and in the opposite direction, so that the crushed materials can be screened;

[0064] The connecting plate 1008 moves to the left, so that the right rack 1010 is engaged with the inner cylinder 1012. At this time, the left rack 1009 is separated from the outer cylinder 1011. Under the up and down reciprocating movement of the connecting plate 1008, the inner cylinder 1012 can be driven to rotate back and forth, and the inner cylinder 1012 drives the outer cylinder 1011 to rotate, thereby increasing the transmission ratio, that is, increasing the mutual moving distance of the upper sieve plate 11 and the lower sieve plate 12, and realizing the adjustment of the sieve hole size.

[0065] The device also includes a conveying mechanism 15 for returning the material on the upper surface of the upper screen plate 11. The output end of the conveying mechanism 15 guides the material back to the feed port 2 through a conduit 16. Specifically, partitions 17 are fixedly connected to the inner walls on both sides of the box body 1 to play a role in guiding the material. A connecting pipe 13 is arranged on the rear side of the interior of the box body 1, and a plurality of feed hoods 14 are arranged at the bottom of the connecting pipe 13. The connecting pipe 13 is connected to the conveying mechanism 15 through a negative pressure pump.

[0066] The above structure, under the action of the negative pressure pump, can introduce the incompletely screened materials on the upper screen plate 11 into the conveying mechanism 15 for further processing. Specifically, the conveying mechanism 15 includes a conveyor 1501 fixedly connected to the right outer surface of the box body 1, and a conveying motor 1502 is fixedly connected to the upper surface of the conveyor 1501. The output end of the conveying motor 1502 passes through the interior of the conveyor 1501 and is fixedly connected to a conveying blade 1503, that is, the conveying motor 1502 drives the conveying blade 1503 to rotate, thereby realizing the conveying of the return material.

[0067] A material discharge port 18 is provided at the middle side of the bottom of the box body 1 for material discharge, supporting legs 19 are provided at the four corners of the bottom of the box body 1, and an observation window 20 is provided on the front of the box body 1 for observing the internal situation.

[0068] Working principle: Before using the plastic powder feeding device, adjust the position of the connecting plate 1008 according to the required material size and adjust the spacing of the crushing rollers 9. Specifically:

[0069] When larger materials are needed, the connecting plate 1008 moves to the left, so that the right rack 1010 is meshed with the inner cylinder 1012, and the positioning block 1007 is locked by the second positioning bolt 1017; at the same time, the switch of the regulating motor 802 is turned on to increase the spacing of the crushing rollers 9, and everything is ready to continue, pouring the materials to the feed port 2, and turning on the switch of the driving motor 302 at the same time, the crushing and screening of the materials can be achieved, and then the materials that are not completely screened on the upper screen plate 11 are introduced into the conveying mechanism 15 for further processing;

[0070] When smaller materials are needed, the connecting plate 1008 moves to the right, so that the left rack 1009 engages with the outer cylinder 1011, and the positioning block 1007 is locked by the first positioning bolt 1016; at the same time, the switch of the adjusting motor 802 is turned on to reduce the spacing between the crushing rollers 9, and everything is ready to continue. The material is poured toward the feed port 2, and the switch of the driving motor 302 is turned on at the same time, so that the material can be crushed and screened. Secondly, the material that is not completely screened on the upper screen plate 11 is introduced into the conveying mechanism 15 for further processing.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plastic powder feeding device, characterized in that: The invention comprises a box body (1), a reciprocating mechanism (3), an adjusting mechanism (8), a screening mechanism (10) and a conveying mechanism (15), wherein the upper surface of the box body (1) is provided with a material inlet (2), the reciprocating mechanism (3) is arranged at the upper left part of the box body (1), and the output end of the reciprocating mechanism (3) is provided with a reciprocating connecting gear (4), the upper side of the connecting gear (4) is meshingly connected with a first rack (5) fixedly connected to the inner wall of the box body (1), and the lower side of the connecting gear (4) is meshingly connected with a second rack (6) slidably connected to the inner wall of the box body (1), and under the reciprocating action of the reciprocating mechanism (3), the connecting gear (4) is driven to reciprocate, and under the transmission action of the first rack (5), the second rack (6) is driven to reciprocate in an extended range, and the right end of the second rack (6) is fixedly connected with a distribution hopper (7), and the distribution hopper (7) is connected to the material inlet (2) through a soft sleeve; The adjusting mechanism (8) is arranged at the middle of the left side of the box body (1); two crushing rollers (9) rotating synchronously and in opposite directions are arranged at the middle side of the interior of the box body (1); the adjusting mechanism (8) drives the two crushing rollers (9) to adjust the spacing; the adjusting mechanism (8) comprises a second connecting frame (801) fixedly connected to the outer surface of the left side of the box body (1); the outer surface of the second connecting frame (801) is fixedly connected to an adjusting motor (802); the output end of the adjusting motor (802) passes through the interior of the second connecting frame (801) and is connected to the first bevel gear. The wheel group (803) is connected to a bidirectional threaded rod (804); both sides of the bidirectional threaded rod (804) are threadedly connected to threaded blocks (805); the outer surfaces of the two threaded blocks (805) are rotatably connected to a rotating rod (807); the two crushing rollers (9) are respectively fixedly connected to the right ends of the rotating rod (807); one side of the rotating rod (807) is rotatably connected to a telescopic rod (809) via a second bevel gear group (808); the outer wall of the telescopic rod (809) is slidably sleeved with a sleeve rod (810) that rotates synchronously with the telescopic rod (809); The middle outer wall of the sleeve rod (810) is rotatably connected to a first connecting rod (815) via a third bevel gear set (814); the upper end of the first connecting rod (815) is further connected to the output end of the drive motor (302) via a fourth bevel gear set (816); The middle outer wall of the sleeve rod (810) is rotatably connected to a second connecting rod (818) via a fifth bevel gear set (817), and the bottom of the second connecting rod (818) is rotatably connected to a rotating shaft (820) via a sixth bevel gear set (819); The screening mechanism (10) is arranged at the bottom of the left side of the box body (1); an upper screening plate (11) and a lower screening plate (12) are arranged on the inner bottom side of the box body (1); the screening mechanism (10) drives the upper screening plate (11) and the lower screening plate (12) to move synchronously and in opposite directions to achieve adjustment of the moving distance; the screening mechanism (10) comprises a third connecting frame (1001) fixedly connected to the outer surface of the left side of the box body (1); the upper inner wall of the third connecting frame (1001) is fixedly connected to a fixing frame (1002); the fixing frame (1002) is fixedly connected to the inner wall of the fixing frame (1001); 02) is rotatably connected to a rotating shaft (820) inside, the outer end of the rotating shaft (820) is fixedly connected to a second rotating disk (1003), the outer surface of the second rotating disk (1003) is rotatably connected to a second connecting rod (1004) on the outer side, the bottom of the second connecting rod (1004) is rotatably connected to a second slide plate (1005), the bottom of the second slide plate (1005) is fixedly connected to a second guide rod (1006), and the bottom of the second guide rod (1006) is slidably connected to a connecting plate (1008) via a positioning block (1007); A first positioning bolt (1016) and a second positioning bolt (1017) are provided on the front side of the connecting plate (1008), and the first positioning bolt (1016) and the second positioning bolt (1017) are threadably matched with the positioning block (1007) respectively; A left rack (1009) is fixedly connected to the left side of the bottom of the connecting plate (1008); an outer cylinder (1011) is meshedly connected to the right side of the left rack (1009); a right rack (1010) is fixedly connected to the right side of the bottom of the connecting plate (1008); an inner cylinder (1012) is meshedly connected to the left side of the right rack (1010); the outer cylinder (1011) and the inner cylinder (1012) are coaxial, and a positioning rod (1013) fixedly connected to the third connecting frame (1001) is fixedly connected in the middle; The upper side of the outer cylinder (1011) is meshedly connected with an upper rack (1014) fixedly connected to the upper sieve plate (11), and the lower side of the outer cylinder (1011) is meshedly connected with a lower rack (1015) fixedly connected to the lower sieve plate (12); It also includes a conveying mechanism (15) for returning material on the upper surface of the upper sieve plate (11), wherein the output end of the conveying mechanism (15) guides the material back to the feed inlet (2) via a conduit (16); A feeding port (18) is provided at the middle of the bottom of the box body (1), supporting legs (19) are provided at the four corners of the bottom of the box body (1), and an observation window (20) is provided at the front of the box body (1).

2. A plastic powder feeding device according to claim 1, characterized in that: The reciprocating mechanism (3) comprises a first connecting frame (301) fixedly connected to the left outer surface of the box body (1); a driving motor (302) is arranged inside the first connecting frame (301); an output end of the driving motor (302) is fixedly connected to a first rotating disk (303); an outer surface of the first rotating disk (303) is rotatably connected to a first connecting rod (304) on the outer side; a first slide plate (305) is rotatably connected to the right end of the first connecting rod (304); a first guide rod (306) is fixedly connected to the right side of the first slide plate (305); and the connecting gear (4) is rotatably connected to the right side of the first guide rod (306).

3. A plastic powder feeding device according to claim 1, characterized in that: The outer wall of the telescopic rod (809) is fixedly connected to a limit block (811), and the limit block (811) is slidably engaged with the inner wall of the sleeve rod (810); It also includes a connecting frame (806), one end of the connecting frame (806) being fixedly connected to a first bearing seat (8061) for connecting the threaded block (805) and the rotating rod (807), and the other end of the connecting frame (806) being fixedly connected to a second bearing seat (8062) sleeved on the outer wall of the telescopic rod (809); It also includes a fixing rod (813) fixedly connected to the outer surface of the box body (1), and the other end of the fixing rod (813) is fixedly connected to a positioning bearing seat (812) sleeved on the outer wall of the sleeve rod (810).

4. A plastic powder feeding device according to claim 1, characterized in that: Partition plates (17) are fixedly connected to the inner walls of both sides of the box body (1), a connecting pipe (13) is arranged at the rear side of the interior of the box body (1), a plurality of feed covers (14) are arranged at the bottom of the connecting pipe (13), and the connecting pipe (13) is connected to a conveying mechanism (15) via a negative pressure pump.

5. A plastic powder feeding device according to claim 4, characterized in that: The conveying mechanism (15) comprises a conveyor (1501) fixedly connected to the right outer surface of the box body (1), a conveying motor (1502) fixedly connected to the upper surface of the conveyor (1501), an output end of the conveying motor (1502) passing through the interior of the conveyor (1501) and fixedly connected to a conveying blade (1503).

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