Crushing device for double-screw extruder

Abstract

The utility model provides a crushing device for a twin-screw extruder, and relates to the technical field of crushing devices, the crushing device comprises a feeding box arranged at a feeding port of the extruder, a cutter rod and a plurality of blades on the cutter rod, the bottom of the feeding box extends downwards to be communicated with the feeding port of the extruder, the bottom end of the cutter rod is sleeved on the inner bottom surface of the feeding box, and the cutter rod is arranged on the feeding box. The bottom edge of the outer wall of the feeding box is fixedly connected with a motor, the side edge of the outer wall of the feeding box is fixedly connected with a gearbox, a plurality of inserting blocks rotate to drive a mounting disc to drive a cutter rod to rotate, then a plurality of blades rotate, and due to the fact that one side of each blade is attached to the inner wall of the feeding box, gaps between the blades and the interior of the feeding box can be ignored; therefore, when the raw materials pass through the plurality of rotating blades, the raw materials can be effectively crushed.

Description

Technical Field

[0001] The utility model relates to the technical field of crushing devices, in particular to a crushing device for a twin-screw extruder. Background Art

[0002] As a new type of material, the application fields of nano plastics are constantly expanding. In order to achieve plastic nanoization, a compounding method is often used. As the most widely used compounding equipment at present, when the twin-screw extruder is used for nano material compounding, in order to prevent the nano plastics entering the extruder from being granulated in the nano plastic finished products due to the shear gap.

[0003] Therefore, a twin-screw extruder with a mixing structure, with the publication number: CN219926881U, includes a base plate and a mixing mechanism. The mixing mechanism includes a central controller, an electronic display screen is arranged at the front end of the central controller, a mixing chamber is arranged on the left side of the central controller, a rotating shaft is arranged inside the mixing chamber, and a crusher is arranged at the left end of the rotating shaft. When in use, first operate the extruder through the electronic display screen, put the raw materials into the mixing chamber, and then rotate the crusher to uniformly mix the raw materials. After uniform mixing, enter the twin-screw housing. Through the settings of the mixing chamber and the crusher, the raw materials can be crushed and dispersed in the mixing chamber.

[0004] However, since the installed crusher is fixed in position in the mixing chamber, when the raw materials in the mixing chamber pass through the gap between the crusher and the mixing chamber, they will miss the crusher, and then the raw materials will enter the extruder without being crushed, which may affect the final product quality. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problems existing in the prior art, and to propose a crushing device for a twin-screw extruder.

[0006] To achieve the above object, the utility model adopts the following technical scheme: A crushing device for a twin-screw extruder, including a feed box installed at the feed inlet of the extruder, a cutter bar and a plurality of blades on the cutter bar. The bottom of the feed box extends downward to communicate with the feed inlet of the extruder, and the bottom end of the cutter bar is sleeved on the inner bottom surface of the feed box. The bottom edge of the outer wall of the feed box is fixedly connected with a motor, and the side edge of the outer wall is fixedly connected with a gearbox. The input shaft of the gearbox extends downward and is driven by a belt with the main shaft of the motor. The main shaft of the motor extends into the feed box and is fixedly connected with a plug board. A lifting cover is sleeved on the plug board. Two chain-driven sprockets are rotatably connected to the top of the inner cover of the lifting cover. One of the sprockets is penetrated by the plug board, and a plurality of insertion blocks are fixedly connected to the bottom edge of the other sprocket. The top end of the cutter bar is detachably connected with a mounting plate inserted with the plurality of insertion blocks, and a plurality of blades installed on the surface of the cutter bar are slidably connected with the inner side wall of the feed box.

[0007] Preferably, a chuck sleeved on the plug board is rotatably connected to the top of the inner cover of the lifting cover.

[0008] Preferably, the edge of the mounting plate is provided with tooth-like shapes, and the end face of the mounting plate and the top end of the cutter bar are connected by a plurality of bolts.

[0009] Preferably, the handles of a plurality of blades at the same height on the surface of the cutter bar are arranged in a ring shape and are also connected to the cutter bar by bolts.

[0010] Preferably, a plurality of lead screws distributed in a circular array are rotatably connected to the side edge of the bottom of the feed box. A pressing plate is sleeved on the lead screws. Among the plurality of lead screws, two lead screws along the length direction of the extruder and in the same vertical plane as the gearbox are threadedly penetrated by the pressing plate.

[0011] Preferably, a support frame is fixedly connected to the outer side of the feed box above the gearbox. A rotating frame that swings along the length direction of the extruder is rotatably connected to the support frame. Two belt wheels driven by a belt are rotatably connected to the rotating frame. One end faces of the two belt wheels extend outward in a convex shape and are respectively inserted into the top ends of the two lead screws in the same vertical plane as the gearbox.

[0012] Preferably, two chain-driven sprockets are also rotatably connected to the rotating frame. One end face of one of the sprockets on the rotating frame is fixed to the other end face of the belt wheel close to the support frame. The other end face of the other sprocket on the rotating frame is slidably inserted with a transmission plate fixed to the output end of the gearbox.

[0013] Compared with the prior art, the advantages and positive effects of the utility model are as follows.

[0014] 1. In the present utility model, a number of insertion blocks rotate to drive the mounting disc, which drives the cutter bar to rotate, and further rotates a number of blades. Since one side of the blade is in contact with the inner wall of the feed box, the gap between the blade and the inside of the feed box can be ignored. Therefore, when the raw material passes through the rotating blades, it can be effectively crushed.

[0015] 2. In the present utility model, by rotating the two lead screws threadedly connected to the pressing plate, and with the assistance of the other lead screws passing through the pressing plate, the pressing plate is lifted and lowered as the fixed-position lead screw rotates. By lowering the pressing plate, the raw material in the feed box can fully pass through the rotating blades without bouncing at the blades, thus affecting the crushing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic three-dimensional structure diagram of a crushing device for a twin-screw extruder proposed by the present utility model;

[0017] Figure 2 FIG. is a schematic structural diagram of the feed box of a crushing device for a twin-screw extruder proposed by the present utility model;

[0018] Figure 3 FIG. is a crushing device for a twin-screw extruder proposed by the present utility model Figure 2 viewed from below;

[0019] Figure 4 FIG. is a crushing device for a twin-screw extruder proposed by the present utility model Figure 2 in sectional view;

[0020] Figure 5 FIG. is a crushing device for a twin-screw extruder proposed by the present utility model Figure 4 with an enlarged view of part A.

[0021] LEGEND: 1. Feed box; 2. Pressing plate; 3. Gearbox; 4. Lead screw; 5. Rotating frame; 6. Pulley; 7. Transmission plate; 8. Chuck; 9. Support frame; 10. Motor; 11. Cutter bar; 12. Lifting cover; 13. Insertion plate; 14. Sprocket; 15. Insertion block; 16. Mounting disc; 17. Blade. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to more clearly understand the above objects, features and advantages of the present utility model, the present utility model will be further described below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0023] In the following description, many specific details are set forth in order to provide a thorough understanding of the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed in the following specification.

[0024] As Figures 1-5 shown, a crushing device for a twin-screw extruder includes a feed box 1 installed at the feed inlet of the extruder, a cutter bar 11 and a plurality of blades 17 on the cutter bar 11. The extruder is an existing twin-screw extruder. The bottom of the feed box 1 extends downward to communicate with the feed inlet of the extruder, and the bottom end of the cutter bar 11 is sleeved on the inner bottom surface of the feed box 1. The cutter bar 11 is arranged directly above the feed inlet of the extruder. The bottom edge of the outer wall of the feed box 1 is fixedly connected with a motor 10, and the side edge of the outer wall is fixedly connected with a gearbox 3. The input shaft of the gearbox 3 extends downward and is driven by a belt strip with the main shaft of the motor 10. By installing belt pulleys on the main shaft of the motor 10 and the input shaft of the gearbox 3, while the main shaft of the motor 10 rotates, the input shaft of the gearbox 3 is driven to rotate, and through the speed-changing function of the gearbox 3, it is realized to output at a lower speed:

[0025] In addition, the main shaft of the motor 10 extends into the feed box 1 and is fixedly connected with a plug board 13. A lifting cover 12 is sleeved on the plug board 13. The main shaft of the motor 10 drives the plug board 13 to rotate relative to the lifting cover 12, and the provided lifting cover 12 can lift and rotate along the surface of the plug board 13. Two chain-driven sprockets 14 are rotatably connected to the top of the inner cover of the lifting cover 12, and one of the sprockets 14 is arranged through the plug board 13, and the bottom edge of the other sprocket 14 is fixedly connected with a plurality of insertion blocks 15. When the plug board 13 drives the sprocket 14 on the right side to rotate by using the provided chain, the sprocket 14 on the left side can rotate synchronously, thereby realizing the rotation of a plurality of insertion blocks 15 installed on the end face of the left sprocket 14. The top end of the cutter bar 11 is detachably connected with a mounting plate 16 inserted with a plurality of insertion blocks 15, and a plurality of blades 17 installed on the surface of the cutter bar 11 are slidably connected with the inner side wall of the feed box 1. As Figure 5 shown, the edge of the end face of the mounting plate 16 is in an engaged state with a plurality of insertion blocks 15. Therefore, when a plurality of insertion blocks 15 rotate, correspondingly, the mounting plate 16 is driven to drive the cutter bar 11 to rotate, thereby realizing the rotation of a plurality of blades 17. Also, because one side of the blade 17 is attached to the inner wall of the feed box 1, the raw material can be effectively crushed when passing through a plurality of rotating blades 17. In addition, in this solution, the lifting cover 12 is raised until the insertion blocks 15 are disengaged from the mounting plate 16, and then the lifting cover 12 is rotated to make the insertion blocks 15 and the mounting plate 16 out of alignment, so that the disassembly and assembly of the cutter bar 11 can be realized by the insertion of the cutter bar 11 into the bottom of the feed box 1.

[0026] As Figure 5As shown in the figure: A chuck 8 sleeved on the insertion plate 13 is rotatably connected to the top of the lifting cover 12. By using the rotational connection between the chuck 8 and the lifting cover 12, the lifting cover 12 can rotate relative to the chuck 8, that is, the insertion plate 13. Also, by using the sleeving of the chuck 8 and the insertion plate 13, the lifting cover 12 drives the chuck 8 to move up and down along the surface of the insertion plate 13, and the chuck 8 rotates relative to the lifting cover 12 as the insertion plate 13 rotates. The edge of the mounting plate 16 is provided with tooth-like shapes, and the end face of the mounting plate 16 is connected to the top end of the tool rod 11 through a number of bolts, ensuring that the mounting plate 16 smoothly engages with a number of insertion blocks 15, and the tool rod 11 can be replaced individually by removing the bolts. The tool holders of a number of blades 17 at the same height on the surface of the tool rod 11 are arranged in a ring shape and are also connected to the tool rod 11 through bolts, facilitating the replacement of only the blades 17 with a relatively large degree of wear according to the wear degree of the local blades 17.

[0027] As Figure 2 , 3 , 4 shown: The bottom side of the feeding box 1 is rotatably connected with screw rods 4 distributed in an annular array. A pressing plate 2 is sleeved on the screw rods 4. Among the several screw rods 4, two screw rods 4 along the length direction of the extruder and in the same vertical plane as the gearbox 3 are threadedly penetrated through the pressing plate 2. By rotating the two screw rods 4 threadedly connected to the pressing plate 2, with the assistance of the other screw rods 4 penetrating through the pressing plate 2, the pressing plate 2 is lifted and lowered as the screw rods 4 at the fixed positions rotate. By using the lowering of the pressing plate 2, the raw materials in the feeding box 1 can fully pass through the rotating blades 17 without jumping at the blades 17, affecting the crushing effect. A support frame 9 is fixedly connected to the outer side of the feeding box 1 above the gearbox 3. A rotating frame 5 that swings along the length direction of the extruder is rotatably connected to the support frame 9. As Figure 2As shown, when the rotating frame 5 rotates to the horizontal state, it is just located above the two lead screws 4 that are threadedly connected to the pressure plate 2. Two belt pulleys 6 that are rotationally connected to the rotating frame 5 and are driven by a belt are provided. One end faces of the two belt pulleys 6 extend outwards in a convex shape and are respectively inserted into the tops of the two lead screws 4 located in the same vertical plane of the gearbox 3. As shown in the figure, the end faces of the two belt pulleys 6 on the rotating frame 5 in the horizontal state are just inserted into the tops of the two lead screws 4 that are threadedly connected to the pressure plate 2. Therefore, under the driving action of the belt, the two belt pulleys 6 will rotate synchronously, and then the two lead screws 4 will rotate simultaneously, so that the lifting of the pressure plate 2 can be realized. Two chain wheels 14 that are driven by a chain are also rotationally connected to the rotating frame 5. And one end face of one of the chain wheels 14 on the rotating frame 5 is fixed to the other end face of the belt pulley 6 close to the support frame 9. The other end face of the chain wheel 14 on the rotating frame 5 is slidably inserted with a transmission plate 7 fixed to the output end of the gearbox 3. As shown in the figure again, the two chain wheels 14 provided on the rotating frame 5 can rotate synchronously under the driving action of the chain. And because the right chain wheel 14 is inserted into the end face of the output shaft of the gearbox 3, the rotation of the output shaft of the gearbox 3 will drive the right chain wheel 14 to rotate, and then the left chain wheel 14 will drive the right belt pulley 6 to rotate. And because the rotating frame 5 is hinged to the support frame 9, by using the insertion of the belt pulley 6 and the lead screw 4 and the insertion of the chain wheel 14 and the output shaft of the gearbox 3, the rotating frame 5 can be rotated to the vertical state, that is, it is convenient to remove the pressure plate 2 and add raw materials into the feeding box 1. Or holes can be opened on the pressure plate 2, and the raw materials can be pumped into the feeding box 1 by a pump, and then the raw materials are extruded through the rotating blades 17 by the lowering of the pressure plate 2.

[0028] Working principle: Pour the raw materials into the feeding box 1, start the motor 10. Under the rotating action of the plug board 13, the chain wheel 14 in the lifting cover 12 rotates. Under the biting action of the plug 15 and the mounting disc 16, the tool rod 11 drives the blade 17 to rotate at a high speed. And the provided gearbox 3 can convert the high-speed rotation of the motor 10 into a lower-speed output, so that the right chain wheel 14 on the rotating frame 5 rotates, and then the left chain wheel 14 drives the right belt pulley 6 to rotate. Under the action of the belt, the left belt pulley 6 rotates, and then the two lead screws 4 rotate simultaneously, so that the pressure plate 2 can be slowly lowered to extrude the raw materials in the feeding box 1 through the rotating blades 17.

[0029] The wiring diagrams of the gearbox 3 and the motor 10 in the present utility model belong to the common knowledge in the art. Their working principles are already known technologies, and their models are selected according to actual use. Therefore, the control methods and wiring arrangements of the gearbox 3 and the motor 10 will not be explained in detail.

[0030] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model in other forms. Any person skilled in the relevant art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present utility model, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A pulverizing device for a twin-screw extruder, comprising a feed box (1) mounted at a feed port of the extruder, a cutter rod (11) and a plurality of blades (17) on the cutter rod (11), wherein the bottom of the feed box (1) extends downward to communicate with the feed port of the extruder, and the bottom end of the cutter rod (11) is sleeved on the inner bottom surface of the feed box (1), characterized in that: The bottom edge of the outer wall of the feed box (1) is fixedly connected to a motor (10), and the side edge of the outer wall is fixedly connected to a gearbox (3); the input shaft of the gearbox (3) extends downward and is driven by a main shaft of the motor (10) through a belt; the main shaft of the motor (10) extends into the feed box (1) and is fixedly connected to a plug plate (13); a lifting cover (12) is sleeved on the plug plate (13); the top of the inner cover of the lifting cover (12) is rotatably connected to two sprocket wheels (14) driven by a chain, and one of the sprocket wheels (14) is arranged to penetrate the plug plate (13); the bottom edge of the other sprocket wheel (14) is fixedly connected to a plurality of plug blocks (15); the top of the tool rod (11) is detachably connected to a mounting plate (16) plugged into the plurality of plug blocks (15); and a plurality of blades (17) mounted on the surface of the tool rod (11) are slidably connected to the inner wall of the feed box (1).

2. The pulverizing device for a twin-screw extruder according to claim 1, characterized in that: A chuck (8) sleeved on the insert plate (13) is embedded and rotatably connected to the top of the lifting cover (12).

3. The pulverizing device for a twin-screw extruder according to claim 1, characterized in that: The edge of the mounting plate (16) is arranged in a tooth-like shape, and the end surface of the mounting plate (16) is connected to the top end of the tool rod (11) via a plurality of bolts.

4. The pulverizing device for a twin-screw extruder according to claim 1, characterized in that: The handles of the plurality of blades (17) at the same height on the surface of the tool rod (11) are arranged in a ring shape and are also connected to the tool rod (11) via bolts.

5. The pulverizing device for a twin-screw extruder according to claim 1, characterized in that: The feed box (1) is rotatably connected to a screw rod (4) distributed in a ring array on the side of the bottom of the feed box (1), and a pressure plate (2) is sleeved on the screw rod (4). Among the plurality of screw rods (4), two screw rods (4) along the length direction of the extruder and located in the same vertical plane as the gearbox (3) are threadedly penetrated by the pressure plate (2).

6. The pulverizing device for a twin-screw extruder according to claim 5, characterized in that: The outer side of the feed box (1) is fixedly connected to a support frame (9) located above the gearbox (3); the support frame (9) is rotatably connected to a rotating frame (5) that swings along the length direction of the extruder; the rotating frame (5) is rotatably connected to two pulleys (6) driven by a belt; one end surface of the two pulleys (6) protrudes outward and is respectively plugged into the top ends of two screw rods (4) located on the same vertical plane of the gearbox (3).

7. The pulverizing device for a twin-screw extruder according to claim 6, characterized in that: The rotating frame (5) is also rotatably connected to two sprocket wheels (14) driven by a chain, and an end face of one of the sprocket wheels (14) on the rotating frame (5) is fixed to the other end face of a pulley (6) close to the support frame (9), and an end face of another sprocket wheel (14) on the rotating frame (5) is slidably plugged into a transmission plate (7) fixed to the output end of the gearbox (3).

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