Extruder with pushing mechanism

Abstract

The invention relates to the technical field of extruders, and particularly discloses an extruder with a pushing mechanism, a material pushing and mixing cavity is arranged between a first melt blending cavity and a second melt blending cavity, the pushing mechanism is added, and a pushing module of the pushing mechanism can be utilized to drive a pushing rod, so that a pushing plate can do reciprocating motion in the material pushing and mixing cavity; when a molten material is spirally guided by a second screw rod to enter a material pushing and mixing cavity from a first melt blending cavity, a push plate pushes the molten material to the direction of the second melt blending cavity, the molten material penetrates through a through hole of a baffle, the molten material can be fully mixed in the process that the molten material passes through the through hole, the structure is ingenious, and the practicability is high. By arranging the material pushing and mixing cavity and the pushing mechanism, materials can be mixed, compared with a traditional structure with a lengthened screw, the length of the extruder can be shortened, the structure is more compact, the occupied space of the first melt blending cavity, the material pushing and mixing cavity and the second melt blending cavity is small, and the heating efficiency is higher.

Description

Technical Field

[0001] The invention relates to the technical field of extruders, in particular to an extruder with a pushing mechanism. Background Art

[0002] Screw extruder is a kind of equipment used for melt mixing to produce plastics. After mixing various plastic masterbatches, they are put into the blending chamber of the extruder. The mixture is molten by high temperature. After shear mixing by a single screw or a twin screw, a mixed molten material is obtained. It is best to inject it into the mold through the discharge port. After the mold is closed and cooled, a plastic product is obtained.

[0003] Usually, in order to improve the mixing effect of various plastic masterbatches, the conventional means is to set multiple temperature intervals and appropriately extend the length of the screw. This type of structure can be seen in a lengthened twin-screw extruder disclosed in Chinese Patent Publication No. CN215825918U, which includes a box, a main barrel installed on the top of the box, and an extended barrel installed at one end of the main barrel. The main barrel is rotatably installed with a main screw, and one end of the main screw is fixedly installed with an extended screw. The extended screw is located in the extended barrel, and the main screw is provided with a connecting groove at one end of the extended screw. The end of the extended screw near the main screw is fixedly connected with a connecting block adapted to the connecting groove. The present application adds an extended barrel to the rear end of the main barrel and adds an extended screw to the rear end of the main screw. Since the spacing of the spiral sheets on the surface of the extended screw is shortened to half of that of the main screw, the raw material is conveyed more smoothly before being extruded, the conveyed raw material is more uniform, and the defective rate is reduced.

[0004] Although the use of a lengthened screw can improve the blending effect, it will make the entire equipment longer, occupy a large plant space, have a less compact structure, and consume a lot of heating energy.

[0005] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0006] In view of the above-mentioned deficiencies of the prior art, an object of the present invention is to provide an extruder with a pushing mechanism to solve the problems of the prior art screw extruder having an insufficiently compact structure and high heating energy consumption.

[0007] An extruder with a pushing mechanism, comprising:

[0008] A chassis, wherein a first melting and blending cavity, a pushing and mixing cavity, and a second melting and blending cavity are sequentially arranged in the chassis along the feeding direction;

[0009] A first screw, rotatably disposed in the first melt blending cavity;

[0010] a second screw, rotatably disposed in the second melt blending cavity;

[0011] The pushing mechanism includes a baffle fixed between the pushing and mixing chamber and the second melting and blending chamber and having a plurality of through holes, a pushing plate movable in the pushing and mixing chamber along the feeding direction, a push rod for driving the pushing plate to move along the feeding direction, and a pushing module for driving the push rod, wherein one end of the push rod passes through the chassis, and the pushing module is fixed outside the chassis.

[0012] Specifically, the aperture of the through hole gradually decreases along the feeding direction.

[0013] Specifically, the first screw rod is provided with a first movable hole along the feeding direction, the push rod passes through the first movable hole, the second screw rod is provided with a second movable hole along the feeding direction, and one end of the push rod away from the pushing module moves in the second movable hole.

[0014] Specifically, the push rod is a square rod, and the push rod is also used to drive the first screw rod and the second screw rod to rotate synchronously.

[0015] Specifically, the pushing module includes a first bracket fixed to the outside of the chassis, a first driving device fixed to the first bracket, a pushing block connected to the driving end of the first driving device, and a first mounting plate rotatably arranged on the pushing block, and the push rod is connected to a second mounting plate at one end facing the pushing mechanism, and the first mounting plate is fixedly connected to the second mounting plate.

[0016] Specifically, the diameter of the push plate is d, and the inner diameter of the material pushing and mixing cavity is e, satisfying the following condition: d≤0.8e.

[0017] Specifically, the pushing mechanism also includes an annular plate that can move in the pushing and mixing chamber along the feeding direction. The pushing plate can push the annular plate toward the baffle plate. When the pushing plate abuts against the annular plate, the radial space of the pushing and mixing chamber is closed.

[0018] Specifically, an elastic body for pushing the annular plate to return to the direction of the first screw is provided between the annular plate and the baffle.

[0019] Specifically, the extruder also includes a screw drive mechanism, which includes a second bracket fixed to the outside of the chassis, a second drive device fixed to the second bracket, a driving gear connected to the output end of the second drive device, and a driven gear connected to one end of the first screw and meshing with the driving gear.

[0020] Specifically, a feed hopper with a sealing cover is provided on the chassis, and the lower end of the feed hopper is connected to the first melt blending cavity. The chassis is also provided with a discharge hole, and the discharge hole is connected to the second melt blending cavity.

[0021] Beneficial effects of the present invention:

[0022] The extruder with a pushing mechanism of the present invention has a pushing and mixing chamber between the first melt blending chamber and the second melt blending chamber, and an additional pushing mechanism, the pushing mechanism includes a baffle, a push plate, a push rod and a pushing module, the push rod can be driven by the pushing module so that the push plate can reciprocate in the pushing and mixing chamber, when the molten material enters the pushing and mixing chamber from the first melt blending chamber under the spiral guidance of the second screw, the push plate pushes the molten material toward the second melt blending chamber, and the molten material then passes through the through hole of the baffle, and the process of the molten material passing through the through hole can make the molten material fully mixed, the structure is ingenious, and the mixing of materials can be achieved by setting the pushing and mixing chamber and the pushing mechanism, compared with the traditional structure of lengthening the screw, the length of the extruder can be shortened, the structure is more compact, and the space occupied by the first melt blending chamber, the pushing and mixing chamber and the second melt blending chamber is small, and the heating efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A perspective view of the extruder of the present application;

[0024] Figure 2 The internal structure diagram of the extruder of this application;

[0025] Figure 3 It is a three-dimensional cross-sectional schematic diagram of the extruder of the present application;

[0026] Figure 4 for Figure 3 A magnified view of part B;

[0027] Figure 5 for Figure 3 Enlarged view of part C;

[0028] Figure 6 A top view of the extruder of the present application;

[0029] Figure 7 for Figure 6 Cross-section of the middle AA surface;

[0030] Figure 8 This is a schematic structural diagram of the extruder pushing process of the present application.

[0031] The figures are marked as: chassis 10, first molten blending chamber 11, pushing and mixing chamber 12, second molten blending chamber 13, first screw 20, second screw 30, pushing mechanism 40, through hole 411, baffle 41, push plate 42, push rod 43, pushing module 44, second movable hole 31, first bracket 441, first driving device 442, push block 443, first mounting plate 444, second mounting plate 445, annular plate 45, elastomer 46, screw driving mechanism 50, second bracket 51, second driving device 52, driving gear 53, driven gear 54, feed hopper 14, discharge hole 15, bearing 47. DETAILED DESCRIPTION

[0032] The present invention provides an extruder with a pushing mechanism. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] like Figures 1 to 8 As shown, this embodiment discloses an extruder with a pushing mechanism, comprising:

[0035] A machine case 10, wherein a first melting and blending chamber 11, a pushing and mixing chamber 12, and a second melting and blending chamber 13 are sequentially arranged in the machine case 10 along the feeding direction;

[0036] A first screw 20 is rotatably disposed in the first melt blending chamber 11;

[0037] A second screw 30 is rotatably disposed in the second melt blending chamber 13;

[0038] The pushing mechanism 40 includes a baffle 41 fixed between the pushing and mixing chamber 12 and the second melt blending chamber 13 and having a plurality of through holes 411, a pushing plate 42 movable in the pushing and mixing chamber 12 along the feeding direction, a pushing rod 43 for driving the pushing plate 42 to move along the feeding direction, and a pushing module 44 for driving the pushing rod 43, one end of the pushing rod 43 passes through the chassis 10, and the pushing module 44 is fixed outside the chassis 10.

[0039] In the extruder of this embodiment, a pusher mixing chamber 12 is provided between the first melt blending chamber 11 and the second melt blending chamber 13, and a pushing mechanism 40 is added. The pushing mechanism 40 includes a baffle 41, a pusher plate 42, a push rod 43 and a pushing module 44. The pusher plate 43 can be driven by the pushing module 44 to enable the pusher plate 42 to reciprocate in the pusher mixing chamber 12. When the molten material enters the pusher mixing chamber 12 from the first melt blending chamber 11 under the spiral guidance of the second screw 30, the pusher plate 42 pushes the molten material to the first melt blending chamber 11. The molten material is pushed in the direction of the second melt blending chamber 13, and then passes through the through hole 411 of the baffle 41. The process of the molten material passing through the through hole 411 can make the molten material fully mixed. The structure is ingenious. By setting the pushing and mixing chamber 12 and the pushing mechanism 40, the mixing of materials can be achieved. Compared with the traditional structure of lengthened screw, the length of the extruder can be shortened, the structure is more compact, and the space occupied by the first melt blending chamber 11, the pushing and mixing chamber 12, and the second melt blending chamber 13 is small, and the heating efficiency is higher.

[0040] Further, in order to improve the mixing effect of the molten material and better guide the molten material to pass through the through hole 411 along the feeding direction, please refer to Figure 3 and Figure 4 The aperture of the through hole 411 of this embodiment gradually decreases along the feeding direction. Such a design helps to reduce the resistance when the material passes through, allowing the molten material to pass through faster and improving the efficiency of the material passing; it also helps to optimize the mixing effect of the molten material and improve the mixing efficiency of the molten material.

[0041] It should be noted that the through hole 411 of this embodiment is a truncated cone-shaped through hole, which is easier to shape and manufacture. Of course, the truncated cone-shaped through hole 411 is only one of the preferred implementations. In other embodiments, the through hole 411 can also be a trumpet-shaped through hole, and is not limited to the above implementation.

[0042] Please refer to Figure 6 and Figure 7 In this embodiment, the first screw 20 is provided with a first movable hole along the feeding direction, and the push rod 43 passes through the first movable hole. The second screw 30 is provided with a second movable hole 31 along the feeding direction. The end of the push rod 43 away from the pushing module 44 moves in the second movable hole 31. Through such a design, the position of the push rod 43 can be set more reasonably, avoiding the push rod 43 occupying the space in the first melt blending cavity 11, the pushing and mixing cavity 12 and the second melt blending cavity 13, and the structure is more compact.

[0043] For further information, please refer to Figure 2The push rod 43 of this embodiment is a square rod, and the corresponding first movable hole and second movable hole 31 are designed as square holes that match the shape of the square rod. Therefore, the push rod 43 can drive the first screw 20 and the second screw 30 to rotate synchronously. When the first screw 20 is driven by the screw driving mechanism 50, the linkage effect of the push rod 43 can synchronously drive the second screw 30 to rotate. Therefore, the second screw 30 does not need to be provided with an independent motor or other driving device, thereby reducing equipment costs.

[0044] Please refer to Figure 3 and Figure 5 The pushing module 44 of this embodiment includes a first bracket 441 fixed to the outside of the chassis 10, a first driving device 442 fixed to the first bracket 441, a pushing block 443 connected to the driving end of the first driving device 442, and a first mounting plate 444 rotatably arranged on the pushing block 443. The push rod 43 is connected to a second mounting plate 445 at one end facing the pushing mechanism 40. The first mounting plate 444 is fixedly connected to the second mounting plate 445. The first driving device 442 is used to drive the push rod 43 to reciprocate along the feeding direction. Since the push rod 43 of this embodiment is also used to drive the first screw rod 20 and the second screw rod 30 to rotate synchronously, by providing a rotatable first mounting plate 444 and then fixing the first mounting plate 444 to the second mounting plate 445 at the end of the push rod 43, it can be solved that the push rod 43 can both rotate and be driven by the first driving device 442 to reciprocate along the feeding direction, and the structure is ingenious.

[0045] Please refer to Figure 6 In this embodiment, the diameter of the push plate 42 is d, and the inner diameter of the pushing and mixing chamber 12 is e, which satisfies the following condition: d≤0.8e. Through such an arrangement, before the push plate 42 does not perform the pushing action, an annular gap is formed between the push plate 42 and the pushing and mixing chamber 12, and the molten material can pass through the annular gap into between the push plate 42 and the annular plate 45, and then pass through the circular gap in the middle of the annular plate 45 into between the annular plate 45 and the baffle 41.

[0046] Please refer to Figure 6 and Figure 7 The pushing mechanism 40 also includes an annular plate 45 that can move in the pushing and mixing chamber 12 along the feeding direction. The pushing plate 42 can push the annular plate 45 toward the baffle 41. When the pushing plate 42 and the annular plate 45 are in contact with each other, the radial space of the pushing and mixing chamber 12 is closed. When pushing the material, the pushing plate 42 is driven by the push rod 43 to move toward the baffle 41. The pushing plate 42 is in contact with the annular plate 45 during the movement process. The pushing plate 42 and the annular plate 45 are combined to form a closed plate body, so that the radial space of the pushing and mixing chamber 12 is closed, thereby pushing the molten material between the closed plate body and the baffle 41 through the through hole 411 of the baffle 41, thereby realizing rapid mixing of the molten material.

[0047] In addition, in order to realize the automatic reset of the annular plate 45, please refer to Figure 2 and Figure 3 In this embodiment, an elastic body 46 is provided between the annular plate 45 and the baffle 41 for pushing the annular plate 45 to return to the direction of the first screw 20. The elastic body 46 is preferably a common spring with low cost, but is not limited to common springs. Other elastic metal parts such as butterfly springs can also be used.

[0048] Please refer to Figure 2 The extruder of this embodiment also includes a screw driving mechanism 50, which includes a second bracket 51 fixed to the outside of the chassis 10, a second driving device 52 fixed to the second bracket 51, a driving gear 53 connected to the output end of the second driving device 52, and a driven gear 54 connected to one end of the first screw 20 and meshing with the driving gear 53. The second driving device 52 can be a motor, and the second driving device 52 drives the driving gear 53, and the driving gear 53 drives the driven gear 54 to rotate, thereby driving the first screw 20 to rotate, and the structure is simple.

[0049] Please refer to Figure 3 In this embodiment, a feed hopper 14 with a sealing cover is provided on the chassis 10, and the lower end of the feed hopper 14 is connected to the first melt blending chamber 11. The chassis 10 is also provided with a discharge hole 15, and the discharge hole 15 is connected to the second melt blending chamber 13. The mixed plastic masterbatch can be fed from the feed hopper 14, and the mixed plastic masterbatch forms a molten body at high temperature in the first melt blending chamber 11, and is mixed in turn through the pushing mixing chamber 12 and the second melt blending chamber 13, and finally ejected from the discharge hole 15.

[0050] In addition, in order to enable the push rod 43 to drive the push plate 42, the push rod 43 and the push plate 42 can be locked and fixed by locking parts such as bolts; since the baffle 41 is fixed, in order to ensure that the position where the push rod 43 passes through the baffle 41 does not affect the rotation of the push rod 43, a bearing 47 is also added at this position.

[0051] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. An extruder with a pushing mechanism, characterized in that: include: A machine case (10), wherein a first melting and blending chamber (11), a material pushing and mixing chamber (12), and a second melting and blending chamber (13) are sequentially arranged in the machine case (10) along a feeding direction; A first screw (20) rotatably disposed in the first melt blending chamber (11); a second screw (30) rotatably disposed in the second melt blending chamber (13); The pushing mechanism (40) comprises a baffle (41) fixed between the pushing and mixing chamber (12) and the second melt blending chamber (13) and having a plurality of through holes (411), a pushing plate (42) movable in the pushing and mixing chamber (12) along the feeding direction, a pushing rod (43) for driving the pushing plate (42) to move along the feeding direction, and a pushing module (44) for driving the pushing rod (43), wherein one end of the pushing rod (43) passes through the chassis (10), and the pushing module (44) is fixed outside the chassis (10).

2. An extruder with a pushing mechanism according to claim 1, characterized in that: The aperture of the through hole (411) gradually decreases along the feeding direction.

3. An extruder with a pushing mechanism according to claim 1, characterized in that: The first screw rod (20) is provided with a first movable hole along the feeding direction, and the push rod (43) passes through the first movable hole. The second screw rod (30) is provided with a second movable hole (31) along the feeding direction, and one end of the push rod (43) away from the pushing module (44) moves in the second movable hole (31).

4. An extruder with a pushing mechanism according to claim 3, characterized in that: The push rod (43) is a square rod, and the push rod (43) is also used to drive the first screw rod (20) and the second screw rod (30) to rotate synchronously.

5. The extruder with a pushing mechanism according to claim 1, characterized in that: The pushing module (44) includes a first bracket (441) fixed to the outside of the chassis (10), a first driving device (442) fixed to the first bracket (441), a pushing block (443) connected to the driving end of the first driving device (442), and a first mounting plate (444) rotatably arranged on the pushing block (443), and the push rod (43) is connected to a second mounting plate (445) at one end facing the pushing mechanism (40), and the first mounting plate (444) is fixedly connected to the second mounting plate (445).

6. The extruder with a pushing mechanism according to claim 1, characterized in that: The diameter of the push plate (42) is d, and the inner diameter of the material pushing and mixing chamber (12) is e, satisfying the following condition: d≤0.8e.

7. An extruder with a pushing mechanism according to claim 6, characterized in that: The pushing mechanism (40) further comprises an annular plate (45) movable in the pushing and mixing chamber (12) along the feeding direction; the pushing plate (42) can push the annular plate (45) toward the baffle (41); and when the pushing plate (42) abuts against the annular plate (45), the radial space of the pushing and mixing chamber (12) is closed.

8. An extruder with a pushing mechanism according to claim 7, characterized in that: An elastic body (46) is also provided between the annular plate (45) and the baffle plate (41) for pushing the annular plate (45) to return to the direction of the first screw rod (20).

9. The extruder with a pushing mechanism according to claim 1, characterized in that: The extruder further comprises a screw drive mechanism (50), the screw drive mechanism (50) comprising a second bracket (51) fixed to the outside of the chassis (10), a second drive device (52) fixed to the second bracket (51), a driving gear (53) connected to the output end of the second drive device (52), and a driven gear (54) connected to one end of the first screw (20) and meshing with the driving gear (53).

10. The extruder with a pushing mechanism according to claim 1, characterized in that: The chassis (10) is provided with a feed hopper (14) with a sealing cover, the lower end of the feed hopper (14) is connected to the first melt blending cavity (11), and the chassis (10) is also provided with a discharge hole (15), and the discharge hole (15) is connected to the second melt blending cavity (13).

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