Plastic melt filtering device

Abstract

The invention discloses a plastic melt filtering device, which belongs to the field of plastic processing. The device comprises a flow channel tube, which is a non-continuous pipeline and is rotatably connected to a turntable at a disconnection of the flow channel tube, and two end faces of the turntable are fitted with two disconnected end faces of the flow channel tube; a plurality of through holes are arranged in an annular array on the turntable, and filter units are connected in the plurality of through holes. When the turntable rotates, the plurality of through holes can be respectively connected to the flow channel tube, so that the plurality of filter units can work alternately; the invention arranges filter units in the through holes arranged on the turntable, and the filter units filter the plastic fluid and impurities flowing in the flow channel tube. When the filter units need to be replaced, the through holes on the turntable can be alternately connected to the flow channel tube by rotating the turntable, so that the plurality of filter units can be used alternately, making the replacement of the filter units more convenient and without the need to stop the machine or stop the machine for too long, thereby improving the working efficiency of the equipment.

Description

Technical Field

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

[0002] In the plastics processing industry, the purity of the plastic melt is crucial to the quality of the final product. Molten plastic often carries tiny impurities, particulate matter, or incompletely melted residues. If these impurities are not effectively removed, they can seriously affect the product's appearance, performance, and even service life. Therefore, before entering the mold for molding, the plastic melt must undergo rigorous filtration to ensure its cleanliness.

[0003] Traditional plastic melt filtration systems often use fixed filters or filter elements. These filter elements gradually accumulate impurities during continuous operation, leading to reduced filtration efficiency and even clogging, which in turn affects the continuity and stability of the production line. Cleaning or replacing these clogged filter elements often requires downtime, which not only increases production costs but also reduces efficiency. Furthermore, downtime for cleaning can cause the plastic melt to degrade or solidify during downtime, further increasing the difficulty and cost of cleanup. Summary of the Invention

[0004] The object of the present invention is to provide a plastic melt filtering device, which solves the problem of inconvenience in replacing the filtering unit of the existing device.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a plastic melt filtration device, comprising a flow channel tube, wherein the flow channel tube is a discontinuous pipe, and a turntable is rotatably connected to the disconnection portion of the flow channel tube, and two end surfaces of the turntable are in contact with the two disconnected end surfaces of the flow channel tube;

[0006] The turntable is provided with a plurality of through holes in a circular array, and filter units are connected to the plurality of through holes. When the turntable rotates, the plurality of through holes can be connected to the flow channel pipes respectively, so that the plurality of filter units can work alternately.

[0007] Preferably, a box is provided at the lower portion of the turntable, the box being slidably connected to the melter, a flushing pipe and a return pipe being symmetrically connected thereto, and acetone is contained in the box, the acetone being able to flow through the flushing pipe and the return pipe, the flow direction of the acetone being opposite to the flow direction of the plastic melt, a gap being provided between the flushing pipe and the return pipe, and the distance of the gap being equal to the thickness of the turntable;

[0008] When one of the filter units is in working state, the corresponding through hole of the replaced filter unit is connected to the flushing pipe and the return pipe, and the acetone flows through the flushing pipe, the through hole and the return pipe, thereby flushing the filter unit;

[0009] Before the acetone flushes the filter unit, the housing slides so that the reflux pipe is plugged into the through hole, thereby pushing out the filter unit in the through hole and locking the turntable at the same time.

[0010] Preferably, a first support is slidably connected to the box body and a second support is fixedly connected thereto, the return pipe is connected to the first support, the first support and the inner wall of the box body are connected to a first telescopic rod, a first spring is sleeved on the first telescopic rod, and both ends of the first spring are respectively in contact with the first support and the box body.

[0011] Preferably, a vertically arranged filter screen is connected to the box body, and the filter screen can isolate the washed plastic;

[0012] The second support is connected to a base, the base is connected to a water pump, the water pump is connected to a metal pipe, and both ends of the metal pipe are respectively connected to the box and the flushing pipe.

[0013] Preferably, a section of the flow channel tube located on the second support side is connected to a rectangular tube, and a rectangular block is slidably connected inside the rectangular tube;

[0014] After the box body slides to unlock the turntable, the turntable can rotate, and when the turntable rotates, the rectangular block slides in a direction away from the flow channel tube.

[0015] Preferably, the base is connected to a motor, the output end of the motor is connected to a drive shaft, the turntable is coaxially connected to a rotating shaft, the end of the drive shaft is connected to a clamping block, and the end of the rotating shaft is provided with a clamping slot that cooperates with the clamping block;

[0016] When the box moves, the box can drive the flushing pipe to push the filter unit to reset, so that the return pipe is drawn out of the through hole, and the card block is connected to the card slot, so that the motor can drive the turntable to rotate.

[0017] Preferably, a gear is connected to the rotating shaft, and a rack is hinged at the end of the rectangular block, and the rack can be engaged with the gear;

[0018] The flushing pipe is connected to a first wedge and a second wedge. When the flushing pipe approaches the gear and the return pipe is pulled out of the through hole, the first wedge can slide to the lower part of the rack, so that the first wedge can push the rack to swing up to engage with the gear. Moreover, when the flushing pipe moves away from the gear, the first wedge moves out of the lower part of the rack, the rack fits into the flushing pipe, and the second wedge then abuts against the end of the rack, so that when the flushing pipe continues to move away from the gear, the second wedge can push the rack to drive the rectangular block to reset.

[0019] Preferably, a pressure plate is connected to the upper surface of the second wedge block, and a protrusion is provided at the end of the rack. When the second wedge block abuts against the rack, the pressure plate presses on the upper part of the protrusion;

[0020] The rack is connected with a rotating rod, the rotating rod rotates on the rectangular block, and a torsion spring is connected between the rotating rod and the rectangular block.

[0021] Preferably, locking blocks corresponding to the plurality of filter units are radially slidably disposed in the turntable. When the locking blocks are engaged with the engagement grooves, the locking blocks abut against the filter units, thereby locking the filter units to the turntable.

[0022] Preferably, a second telescopic rod is axially slidably connected in the rotating shaft, a push block and a limit block are connected to both ends of the second telescopic rod respectively, and a second spring is connected between the push block and the limit block;

[0023] The locking block is connected to a slide rod, an end of the slide rod is provided with a first inclined surface, and the push block is provided with a second inclined surface that fits with the first inclined surface.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention places a filter unit in the through hole on the turntable. The filter unit filters the plastic fluid and impurities flowing in the flow channel pipe. When the filter unit needs to be replaced, the through hole on the turntable can be alternately connected to the flow channel pipe by rotating the turntable, so that multiple filter units can be used alternately, making the replacement of the filter unit more convenient without stopping the machine or stopping it for too long, thereby improving the working efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the box body of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the turntable of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the rack of the present invention;

[0030] Figure 5 This is a schematic structural diagram of the first wedge block of the present invention;

[0031] Figure 6 It is a structural schematic diagram of the torsion spring of the present invention;

[0032] Figure 7 It is a structural schematic diagram of the sliding rod of the present invention;

[0033] Figure 8 It is a structural schematic diagram of the push block of the present invention.

[0034] In the figure: 1. flow channel pipe; 11. connecting seat; 12. turntable; 13. filter unit; 2. box body; 201. filter screen; 21. first support; 22. second support; 23. base; 24. water pump; 25. metal pipe; 26. first telescopic rod; 27. first spring; 28. return pipe; 29. ​​flushing pipe; 3. rotating shaft; 31. gear; 32. rectangular cylinder; 33. rectangular block; 34. rack; 341. protrusion; 342. rotating rod; 343. torsion spring; 35. second wedge block; 351. pressure plate; 36. first wedge block; 4. motor; 41. drive shaft; 42. block; 43. limit block; 44. second telescopic rod; 45. second spring; 46. push block; 47. slide bar; 48. lock block; 49. first inclined plane. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0036] Reference Figures 1-8 The present embodiment provides a technical solution: a plastic melt filtering device, comprising a runner tube 1, which is a discontinuous pipe and is rotatably connected to a turntable 12 at the disconnection portion of the runner tube 1, and the two end faces of the turntable 12 are in contact with the two disconnected end faces of the runner tube 1; a plurality of through holes are provided in an annular array on the turntable 12, and a filtering unit 13 is connected to each of the plurality of through holes. When the turntable 12 rotates, the plurality of through holes can be respectively connected to the runner tube 1, so that the plurality of filtering units 13 can work alternately.

[0037] The melted plastic flows through the runner tube 1 and is divided into two sections when it flows to the tube 1. The turntable 12 is set at the disconnection point of the runner tube, and a sealing ring is set around the through-holes on the runner tube 1 or the turntable 12. The setting of the sealing ring prevents the plastic melt from flowing out of the disconnection point of the runner tube 1 or flows out less. A filter unit 13 is placed in the through-hole on the turntable 12. The filter unit 13 filters the plastic fluid and impurities flowing in the runner tube 1. When the filter unit 13 needs to be replaced, the through-holes on the turntable 12 can be alternately connected to the runner tube 1 by rotating the turntable 12, so that multiple filter units 13 can be used alternately, making the replacement of the filter unit 13 more convenient and without the need to stop the machine or stop it for too long, thereby improving the working efficiency of the equipment.

[0038] A box body 2 is provided at the lower part of the turntable 12, and the box body 2 is slidably connected to the melt machine. A flushing pipe 29 and a return pipe 28 are symmetrically connected in the box body 2, and acetone is contained in the box body 2. Acetone can flow in the flushing pipe 29 and the return pipe 28. The flow direction of acetone is opposite to the flow direction of the plastic melt. There is a gap between the flushing pipe 29 and the return pipe 28, and the distance of the gap is equal to the thickness of the turntable 12; when one of the filter units 13 is in working state, the corresponding through hole of the replaced filter unit 13 is connected to the flushing pipe 29 and the return pipe 28, and the acetone flows in the flushing pipe 29, the through hole and the return pipe 28, thereby flushing the filter unit 13; before the acetone flushes the filter unit 13, the box body 2 slides so that the return pipe 28 is inserted into the through hole, thereby pushing out the filter unit 13 in the through hole and locking the turntable 12 at the same time.

[0039] The box body 2 is driven to slide on the melting machine by a cylinder or a screw rod. As the turntable 12 rotates, the new filter unit 13 is moved to a coaxial position with the flow tube 1 for use. After the replaced filter unit 13 is stabilized, it can be located between the return pipe 28 and the flushing pipe 29. At this time, the return pipe 28 and the flushing pipe 29 can be in a coaxial position with the filter unit 13, and the flow direction of the acetone in the flushing pipe 29 is opposite to the flow direction of the plastic melt in the flow tube 1. The acetone flowing in the flushing pipe 29 can backwash the filter unit 13, so that the replaced filter unit 13 is cleaned, thereby facilitating the subsequent continued use of the filter unit 13. In addition, when the return pipe 28 is inserted into the through hole of the turntable 12, acetone begins to flow in the flushing pipe 29, and the insertion of the return pipe 28 into the through hole of the turntable 12 fixes the position of the turntable 12, ensuring that the filter unit 13 in use is stably in a coaxial position with the flow tube 1.

[0040] A first support 21 is slidably connected to the box body 2, and a second support 22 is fixedly connected thereto. The return pipe 28 is connected to the first support 21. A first telescopic rod 26 is connected to the first support 21 and the inner wall of the box body 2. A first spring 27 is sleeved on the first telescopic rod 26. The two ends of the first spring 27 are respectively in contact with the first support 21 and the box body 2.

[0041] The arrangement of the first support 21 and the second support 22 enables the return pipe 28 and the flushing pipe 29 to be connected. The arrangement of the first telescopic rod 26 enables the first support 21 to slide in a limited position. The arrangement of the first spring 27 pushes the first support 21, so that the return pipe 28 and the flushing pipe 29 can firmly clamp the filter unit 13, ensuring that after the filter unit 13 is pushed out of the through hole, the return pipe 28 and the flushing pipe 29 can clamp the filter unit 13 to prevent the filter unit 13 from falling, thereby ensuring that acetone can stably flush the filter unit 13.

[0042] A vertically arranged filter screen 201 is connected to the box body 2, which can isolate the flushed plastic; a base 23 is connected to the second support 22, a water pump 24 is connected to the base 23, and a metal pipe 25 is connected to the water pump 24. The two ends of the metal pipe 25 are respectively connected to the box body 2 and the flushing pipe 29.

[0043] The side wall of the return pipe 28 is connected to a pipe for discharging acetone, or a groove is formed on the side wall of the return pipe 28, so that the refluxed acetone can flow into the box body 2. The filter 201 in the box body 2 can filter the refluxed acetone, so that plastic particles that may be mixed with the acetone can be separated. The metal pipe 25 is arranged on the other side of the filter 201. The metal pipe 25 can prevent corrosion by the acetone. The acetone extracted by the flushing pipe 29 is filtered acetone.

[0044] A rectangular tube 32 is connected to a section of the flow tube 1 located on the side of the second support 22, and a rectangular block 33 is slidably connected inside the rectangular tube 32; after the box body 2 slides to unlock the turntable 12, the turntable 12 can rotate, and when the turntable 12 rotates, the rectangular block 33 slides in the direction away from the flow tube 1.

[0045] When the turntable 12 rotates, the through hole and the runner tube 1 are misaligned, and the plastic melt will flow out of the broken part of the runner tube 1. When the turntable 12 rotates, the rectangular block 33 can be pulled out of the rectangular cylinder 32, so that the space inside the rectangular cylinder 32 increases. At this time, the plastic melt in the runner tube 1 can flow into the rectangular cylinder 32, so that the plastic melt in the section of the runner tube 1 where the plastic melt flows out can be extracted into the rectangular cylinder 32, so that when the turntable 12 rotates, the amount of plastic melt flowing out of the runner tube 1 is reduced.

[0046] A motor 4 is connected to the base 23, and a drive shaft 41 is connected to the output end of the motor 4. The rotary shaft 3 is coaxially connected to the turntable 12, and a clamping block 42 is connected to the end of the drive shaft 41. A slot that cooperates with the clamping block 42 is provided at the end of the rotary shaft 3; when the box body 2 moves, the box body 2 can drive the flushing pipe 29 to push the filter unit 13 to reset, so that the return pipe 28 is pulled out of the through hole, and the clamping block 42 is clamped in the clamping slot, so that the motor 4 can drive the turntable 12 to rotate.

[0047] Before controlling the rotation of the turntable 12, first control the sliding of the box body 2 so that the return pipe 28 is pulled out of the through hole on the turntable 12, so that the turntable 12 is not locked by the return pipe 28 and can rotate. When the box body 2 slides, the base 23 can move synchronously with the motor 4. At this time, the drive shaft 41 of the motor 4 is close to the rotating shaft 3, and the flow channel tube 1 is connected to the connecting seat 11. The rotating shaft 3 rotates on the connecting seat 11. After the return pipe 28 is completely pulled out of the through hole on the turntable 12, the block 42 can be completely engaged in the card slot of the rotating shaft 3, so that the motor 4 can drive the turntable 12 to rotate.

[0048] A gear 31 is connected to the rotating shaft 3, and a rack 34 is hinged at the end of the rectangular block 33, and the rack 34 can engage with the gear 31; a first wedge 36 and a second wedge 35 are connected to the flushing pipe 29. When the flushing pipe 29 approaches the gear 31 and the return pipe 28 is pulled out of the through hole, the first wedge 36 can slide to the lower part of the rack 34, so that the first wedge 36 can push the rack 34 to swing up to engage with the gear 31, and when the flushing pipe 29 moves away from the gear 31, the first wedge 36 moves out of the lower part of the rack 34, and the rack 34 fits the flushing pipe 29, and the second wedge 35 then abuts the end of the rack 34, so that when the flushing pipe 29 continues to move away from the gear 31, the second wedge 35 can push the rack 34 to drive the rectangular block 33 to reset.

[0049] When the box body 2 moves and drives the flushing tube 29 to approach the turntable 12, the first wedge block 36 on the flushing tube 29 can move and approach the rack 34. At this time, the first wedge block 36 pushes the rack 34, causing the rack 34 to swing up, so that the rack 34 can mesh with the gear 31. When the rotating shaft 3 rotates and drives the turntable 12 to rotate, the filter unit 13 on the turntable 12 is in a switching state. At this time, the gear 31 can drive the rack 34 to move, so that the rack 34 can drive the rectangular block 33 to move and slide in the direction away from the rectangular cylinder 32, so that the plastic solution in the flow channel tube 1 can partially enter the rectangular cylinder 32, reducing the plastic solution overflowing when switching the filter unit 13. When the box body 2 slides in the opposite direction to reset, the first wedge block 36 first disengages from the lower part of the rack 34. At this time, the lower hem of the rack 34 contacts the flushing tube 29. After the first wedge block 36 disengages from the rack 34, the flushing tube 29 continues to move so that the second wedge block 35 can contact the end of the rack 34. As the flushing tube 29 moves, the second wedge block 35 can push the rectangular block 33 to reset through the rack 34, preparing for the next switching of the filter unit 13. In addition, when the return pipe 28 is not connected to the through hole on the turntable 12, the water pump 24 does not start. In addition, a support frame can be connected to the box body 2 to support the filter unit 13 pushed out of the turntable 12 to prevent the filter unit 13 from falling.

[0050] The upper surface of the second wedge block 35 is connected to a pressure plate 351, and a protrusion 341 is provided at the end of the rack 34. When the second wedge block 35 abuts against the rack 34, the pressure plate 351 presses on the upper part of the protrusion 341; the rack 34 is connected to a rotating rod 342, and the rotating rod 342 rotates on the rectangular block 33. A torsion spring 343 is connected between the rotating rod 342 and the rectangular block 33.

[0051] When the second wedge block 35 contacts the rack 34, the pressure plate 351 can be located above the protrusion 341 of the rack 34, so that when the second wedge block 35 pushes the rack 34, the rack 34 will not flip up and contact the gear 31, causing the rack 34 to be unable to be pushed.

[0052] Locking blocks 48 corresponding to the plurality of filter units 13 are radially slidably disposed in the rotary disk 12 . When the locking blocks 42 are engaged with the locking slots, the locking blocks 48 abut against the filter units 13 , thereby locking the filter units 13 to the rotary disk 12 .

[0053] The filter unit 13 is placed in the through hole of the turntable 12 so that it can be easily pushed out by the return pipe 28. When the turntable 12 is in a rotating state, the filter unit 13 does not need to be separated from the turntable 12. Therefore, the locking block 48 is in contact with the filter unit 13 at this time, making it difficult for the filter unit 13 to be separated from the turntable 12. The activation timing of the locking block 48 is when the clamping block 42 is completely engaged in the clamping groove on the rotating shaft 3.

[0054] A second telescopic rod 44 is axially slidably connected to the rotating shaft 3, and the two ends of the second telescopic rod 44 are respectively connected to a push block 46 and a limit block 43, and a second spring 45 is connected between the push block 46 and the limit block 43; a sliding rod 47 is connected to the locking block 48, and a first inclined surface 49 is provided at the end of the sliding rod 47, and a second inclined surface that fits the first inclined surface 49 is provided on the push block 46.

[0055] When the block 42 is engaged in the slot on the rotating shaft 3, the block 42 can push the limit block 43. At this time, the second telescopic rod 44 is pushed to shorten, so that the second spring 45 is compressed. At this time, the push block 46 pushes the slide rod 47, causing the slide rod 47 to slide radially, so that the locking block 48 abuts against the filter unit 13. When the drive shaft 41 moves away from the rotating shaft 3, the second spring 45 is not compressed, so that the locking force of the locking block 48 on the filter unit 13 is reduced, so that the filter unit 13 can be pushed out of the through hole on the turntable 12.

[0056] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A plastic melt filtering device, comprising a flow channel tube (1), characterized in that: The flow channel tube (1) is a discontinuous pipe, and a rotating disk (12) is rotatably connected to the disconnected portion of the flow channel tube (1), and two end surfaces of the rotating disk (12) are in contact with two disconnected end surfaces of the flow channel tube (1); The rotating disk (12) is provided with a plurality of through holes in an annular array, and each of the plurality of through holes is connected to a filter unit (13). When the rotating disk (12) rotates, the plurality of through holes can be respectively connected to the flow channel tube (1), so that the plurality of filter units (13) can work alternately; A box body (2) is provided at the lower part of the turntable (12), the box body (2) is slidably connected to the melter, a flushing pipe (29) and a return pipe (28) are symmetrically connected in the box body (2), and acetone is contained in the box body (2), the acetone can flow in the flushing pipe (29) and the return pipe (28), the flow direction of the acetone is opposite to the flow direction of the plastic melt, there is a gap between the flushing pipe (29) and the return pipe (28), and the distance of the gap is equal to the thickness of the turntable (12); When one of the filter units (13) is in a working state, the corresponding through hole of the replaced filter unit (13) is connected to the flushing pipe (29) and the reflux pipe (28), and the acetone flows through the flushing pipe (29), the through hole and the reflux pipe (28), thereby flushing the filter unit (13); Before the acetone flushes the filter unit (13), the housing (2) slides so that the reflux pipe (28) is plugged into the through hole, thereby pushing out the filter unit (13) in the through hole and locking the rotary disk (12) at the same time; A first support (21) is slidably connected to the box body (2), and a second support (22) is fixedly connected to the box body (2); the return pipe (28) is connected to the first support (21), and the second support (22) is connected to a base (23); A section of the flow channel tube (1) located on the second support (22) side is connected to a rectangular tube (32), and a rectangular block (33) is slidably connected inside the rectangular tube (32); The box body (2) slides so that the turntable (12) is unlocked, and the turntable (12) can rotate. When the turntable (12) rotates, the rectangular block (33) slides in a direction away from the flow channel tube (1); The base (23) is connected to a motor (4), the output end of the motor (4) is connected to a drive shaft (41), the rotating disk (12) is coaxially connected to a rotating shaft (3), the end of the driving shaft (41) is connected to a clamping block (42), and the end of the rotating shaft (3) is provided with a clamping groove that cooperates with the clamping block (42); When the box (2) moves, the box (2) can drive the flushing pipe (29) to push the filter unit (13) to reset, so that the return pipe (28) is drawn out of the through hole, and the clamping block (42) is clamped in the clamping groove, so that the motor (4) can drive the rotating disk (12) to rotate; The rotating shaft (3) is connected to a gear (31), and the end of the rectangular block (33) is hingedly connected to a rack (34), and the rack (34) can be meshed with the gear (31); The flushing tube (29) is connected to a first wedge block (36) and a second wedge block (35). When the flushing tube (29) approaches the gear (31) and the return tube (28) is pulled out of the through hole, the first wedge block (36) can slide to the lower part of the rack (34), so that the first wedge block (36) can push the rack (34) to swing upward to engage with the gear (31). When the flushing tube (29) moves away from the gear (31), the first wedge block (36) moves out of the lower part of the rack (34), the rack (34) fits the flushing tube (29), and the second wedge block (35) then abuts against the end of the rack (34), so that when the flushing tube (29) continues to move away from the gear (31), the second wedge block (35) can push the rack (34) to drive the rectangular block (33) to reset.

2. The plastic melt filtering device according to claim 1, characterized in that: The first support (21) and the inner wall of the box body (2) are connected by a first telescopic rod (26), a first spring (27) is sleeved on the first telescopic rod (26), and two ends of the first spring (27) are respectively in contact with the first support (21) and the box body (2).

3. The plastic melt filtering device according to claim 2, characterized in that: A vertically arranged filter screen (201) is connected to the box body (2), and the filter screen (201) can isolate the washed plastic; The base (23) is connected to a water pump (24), the water pump (24) is connected to a metal pipe (25), and both ends of the metal pipe (25) are respectively connected to the box body (2) and the flushing pipe (29).

4. The plastic melt filtering device according to claim 3, characterized in that: The upper surface of the second wedge block (35) is connected to a pressure plate (351), and the end of the rack (34) is provided with a protrusion (341), and when the second wedge block (35) abuts against the rack (34), the pressure plate (351) presses on the upper part of the protrusion (341); The rack (34) is connected to a rotating rod (342), the rotating rod (342) rotates on the rectangular block (33), and a torsion spring (343) is connected between the rotating rod (342) and the rectangular block (33).

5. The plastic melt filtering device according to claim 4, characterized in that: A locking block (48) corresponding to the plurality of filter units (13) is radially slidable in the rotating disk (12); when the locking block (42) is engaged in the engaging groove, the locking block (48) abuts against the filter unit (13), thereby locking the filter unit (13) to the rotating disk (12).

6. The plastic melt filtering device according to claim 5, characterized in that: A second telescopic rod (44) is axially slidably connected inside the rotating shaft (3), two ends of the second telescopic rod (44) are respectively connected to a push block (46) and a limit block (43), and a second spring (45) is connected between the push block (46) and the limit block (43); The locking block (48) is connected to a sliding rod (47), an end of the sliding rod (47) is provided with a first inclined surface (49), and the pushing block (46) is provided with a second inclined surface that fits the first inclined surface (49).

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