Extruder for modified plastic production

Abstract

The utility model relates to the technical field of modified plastic production equipment, in particular to an extruder for modified plastic production, which comprises an extruder, the extruder comprises a shell, a heating device is wrapped outside the shell, and two extrusion screws are rotatably mounted in the shell. The two extrusion screws are meshed with each other, and the tail ends of the extrusion screws penetrate through the shell to be connected with a driving assembly. According to the utility model, through the clamping connection of the connecting groove and the connecting sleeve, the threaded blocks can be connected and fixed with each other, and the torque bearing capacity of the threaded blocks can be improved, so that a higher rotating speed can be borne, and the production efficiency is improved; through cooperation of the connecting grooves and the connecting sleeves, the contact area of every two adjacent threaded blocks is increased, when the seam width changes, molten materials cannot enter the positions between the threaded blocks and the center rod, the center rod is prevented from being polluted, follow-up disassembly, replacement and cleaning are facilitated, the maintenance efficiency can be improved, the maintenance difficulty is reduced, and therefore the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of modified plastics production equipment, specifically an extruder for modified plastics production. Background Technology

[0002] Modified plastics refer to plastic products made from general-purpose and engineering plastics through processing methods such as filling, blending, and reinforcement, which improve their properties such as flame retardancy, strength, impact resistance, and toughness. The production of modified plastics places high demands on extruders, as traditional screw extruders cannot meet the blending requirements. Therefore, twin-screw or three-screw extruders are generally used.

[0003] In existing technology, twin-screw extruders generally include two meshing screws that rotate in opposite directions. The rotation and meshing of the two screws are used to mix and extrude materials. The screws of a twin-screw extruder typically consist of a shaft and a threaded block. The threaded block is slidably mounted on the outside of the shaft and engages with the shaft via splines. Rotation of the shaft drives the threaded block to rotate. By using different threaded blocks, the extruder can adapt to the production and processing requirements of different plastics.

[0004] However, in current technology, the threaded blocks are fixed only by the pressure applied by the cones at the ends. During processing, the gaps between the threaded blocks will change due to thermal expansion and contraction. This causes some molten plastic to enter between the threaded blocks and the rod body through the gaps between the threaded blocks. After the machine stops and the plastic cools down, it will cause the rod body and the threaded blocks to stick together, contaminating the keyway of the rod body, affecting the disassembly of the threaded blocks, and also affecting the installation of new threaded blocks. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an extruder for the production of modified plastics.

[0006] The technical solution of this utility model is:

[0007] An extruder for producing modified plastics, comprising:

[0008] An extruder includes a housing, a heating device is wrapped around the outside of the housing, and two extrusion screws are rotatably mounted inside the housing. The two extrusion screws mesh with each other, and the tail ends of the extrusion screws pass through the housing and are connected to a drive assembly.

[0009] The extrusion screw includes a central rod, and a plurality of threaded blocks are circumferentially engaged with the central rod. The threaded blocks are capable of moving along the axial direction of the central rod, and the threaded blocks are engaged with each other.

[0010] The threaded block has a connecting sleeve at its tail end and a connecting groove on the inner side of its head. The length of the connecting sleeve is shorter than that of the connecting groove.

[0011] The connecting sleeves and connecting grooves of two adjacent threaded blocks are circumferentially engaged, and the connecting sleeves and connecting grooves can slide relative to each other axially.

[0012] The central rod is threadedly connected to a limiting sleeve. The connecting sleeve can be inserted into the limiting sleeve. The connecting sleeve and the limiting sleeve are circumferentially engaged and can slide relative to the limiting sleeve axially.

[0013] Preferably, a fixed sleeve is axially slidably connected between the top of the central rod and the threaded block. The fixed sleeve is circumferentially engaged with both the central rod and the connecting groove, and the inner side of the top of the fixed sleeve abuts against the end face of the threaded block.

[0014] Preferably, the outer side of the end face of the fixed sleeve is provided with a cone head, and the middle of the end face of the cone head is provided with a cone head screw. The cone head screw passes through the fixed sleeve and is threadedly connected to the center rod, and the end face of the cone head abuts against the end face of the threaded block.

[0015] Preferably, a linkage gear is circumferentially engaged at the tail of the central rod, with two linkage gears meshing, and one of the linkage gears being connected to the drive assembly.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention utilizes the snap-fit ​​connection between the connecting groove and the connecting sleeve to fix the threaded blocks together, thereby improving the torque bearing capacity of the threaded blocks and enabling them to withstand higher speeds, thus increasing production efficiency. The cooperation between the connecting groove and the connecting sleeve increases the contact area between two adjacent threaded blocks. When the joint width changes, molten material cannot enter between the threaded block and the central rod, avoiding contamination of the central rod. This facilitates subsequent disassembly, replacement, and cleaning, improving maintenance efficiency and reducing maintenance difficulty, thereby increasing production efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the extruder structure in this utility model;

[0020] Figure 3 This is an exploded view of the extruder structure in this utility model;

[0021] Figure 4 This is an exploded view of the extrusion screw structure in this utility model;

[0022] Figure 5 This is a schematic diagram of the threaded block structure in this utility model.

[0023] The meanings of the labels in the diagram are as follows:

[0024] 1. Workbench;

[0025] 2. Extruder; 21. Outer shell; 22. Sealing plate; 23. Extrusion head; 24. Feed channel; 25. Support frame; 26. Heating device; 27. Feed hopper;

[0026] 3. Extrusion screw; 31. Center rod; 32. Limiting sleeve; 33. Threaded block; 34. Connecting sleeve; 35. Connecting groove; 36. Fixing sleeve; 37. Conical head; 38. Conical head screw; 39. Linkage gear;

[0027] 4. Drive components; 41. Power source; 42. Gearbox. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1:

[0030] Please see Figure 1-5 The present invention will describe the above technical solution in detail through the following embodiments:

[0031] An extruder for producing modified plastics, comprising:

[0032] Extruder 2 includes a housing 21, with a heating device 26 wrapped around the outside of the housing 21. Two extrusion screws 3 are rotatably installed inside the housing 21. The two extrusion screws 3 mesh with each other and the tail end of the extrusion screws 3 passes through the housing 21 and is connected to a drive assembly 4.

[0033] A worktable 1 is located below the extruder 2 and drive assembly 4. The outer casing 21 is fixedly mounted on the top surface of the worktable 1 by a bracket 25. A heating device 26 is used to heat the outer casing 21 to molten the material.

[0034] A sealing plate 22 is fixedly installed at the tail end of the outer shell 21 by bolts, and an extrusion head 23 is fixedly installed at the front end of the outer shell 21 by bolts. A material channel 24 is axially connected inside the outer shell 21, and a feeding hopper 27 is fixedly installed above the tail end of the outer shell 21 by bolts, and the feeding hopper 27 is connected to the material channel 24.

[0035] The extrusion screw 3 includes a central rod 31, and a number of threaded blocks 33 are circumferentially engaged with the central rod 31. The threaded blocks 33 can move axially along the central rod 31, and the threaded blocks 33 are engaged with each other.

[0036] The center rod 31 has an external spline on the outside and the threaded block 33 has an internal spline on the inside. After the threaded block 33 is fitted onto the center rod 31, it can only slide along the axial direction and cannot rotate independently.

[0037] It should be noted that the threaded blocks 33 on the same central rod 31 have different patterns, and the spiral pattern of the threaded blocks 33 needs to be adjusted according to the actual situation.

[0038] The tail of the center rod 31 is circumferentially engaged with a linkage gear 39. The two linkage gears 39 mesh, and one of the linkage gears 39 is connected to the drive assembly 4.

[0039] The linkage gears 39 mesh with each other, ensuring that when one of the linkage gears 39 rotates, the two central rods 31 can rotate synchronously in opposite directions.

[0040] The drive assembly 4 includes a power source 41, which is connected to one of the linkage gears 39 via a gearbox 42.

[0041] The power source 41 can be a known electric motor. The output shaft of the power source 41 is engaged with the input shaft of the gearbox 42. The gearbox 42 is a known reduction gearbox, used to reduce the speed and increase the torque.

[0042] When the power source 41 is working, it can drive one of the linkage gears 39 to rotate through the gearbox 42.

[0043] The threaded block 33 has a connecting sleeve 34 at its tail end and a connecting groove 35 on the inner side of its head. The length of the connecting sleeve 34 is shorter than that of the connecting groove 35.

[0044] The threaded block 33, the connecting sleeve 34, and the connecting groove 35 are integrally formed.

[0045] The inner diameter of the connecting sleeve 34 is the same as the inner diameter of the threaded block 33, and the outer diameter of the connecting sleeve 34 is the same as the inner diameter of the connecting groove 35.

[0046] The connecting sleeves 34 and connecting grooves 35 of two adjacent threaded blocks 33 are circumferentially engaged, and the connecting sleeves 34 and connecting grooves 35 can slide relative to each other axially.

[0047] The connecting sleeve 34 has an external spline on its exterior, and the connecting groove 35 has an internal spline on its interior. After the connecting sleeve 34 and the connecting groove 35 are engaged, they can only slide axially.

[0048] The connecting sleeve 34 and connecting groove 35 of multiple threaded blocks 33 cooperate to make the threaded blocks 33 a whole, improving the torque bearing capacity of the threaded blocks 33. At the same time, the cooperation between the connecting sleeve 34 and connecting groove 35 can increase the contact area between the threaded blocks 33 and reduce the possibility of material seepage.

[0049] The center rod 31 is threadedly connected to the limiting sleeve 32. The connecting sleeve 34 can be inserted into the limiting sleeve 32. The connecting sleeve 34 and the limiting sleeve 32 are circumferentially engaged and can slide relative to the limiting sleeve 32 axially.

[0050] The tail of the connecting sleeve 34 is threaded to the center rod 31. The inner side of the head of the connecting sleeve 34 is provided with an internal spline. After the head of the connecting sleeve 34 is assembled with the limiting sleeve 32, it can restrict the rotation of the limiting sleeve 32.

[0051] A fixed sleeve 36 is axially slidably connected between the top of the center rod 31 and the threaded block 33. The fixed sleeve 36 is circumferentially engaged with both the center rod 31 and the connecting groove 35. The inner side of the top of the fixed sleeve 36 abuts against the end face of the threaded block 33.

[0052] The fixed sleeve 36 has splines on both its inner and outer sides. The fixed sleeve 36 is inserted from the top of the central rod 31 and simultaneously engages with the central rod 31 and the threaded block 33, pressing against the end face of the threaded block 33.

[0053] A cone head 37 is provided on the outer side of the end face of the fixed sleeve 36, and a cone head screw 38 is provided in the middle of the end face of the cone head 37. The cone head screw 38 passes through the fixed sleeve 36 and is threadedly connected to the center rod 31. The end face of the cone head 37 abuts against the end face of the threaded block 33.

[0054] The cone head 37 is fixed by the threaded connection between the cone head screw 38 and the center rod 31. The cone head 37 is used to press and fix the sleeve 36 and the threaded block 33, thereby fixing the threaded block 33.

[0055] In this embodiment, when using this equipment, the operator can select different combinations of threaded blocks 33 according to the processing requirements of the modified plastic to be produced.

[0056] First, put the limiting sleeve 32 onto the center rod 31 and tighten it.

[0057] Next, threaded blocks 33 are fitted onto the center rod 31 in sequence and at the correct angle. The connecting sleeves 34 of the threaded blocks 33 that are in contact with the limiting sleeve 32 are inserted into the limiting sleeve 32, and the connecting sleeves 34 and connecting grooves 35 of two adjacent threaded blocks 33 are engaged with each other.

[0058] Then, the fixing sleeve 36 is inserted from the top of the center rod 31, simultaneously engaging with the center rod 31 and the threaded block 33 and pressing against the end face of the threaded block 33. Next, the tapered head 37 is fixed by the threaded connection between the tapered screw 38 and the center rod 31, and the tapered head 37 is used to press the fixing sleeve 36 and the threaded block 33 to fix the threaded block 33.

[0059] Then the extrusion screw 3 is inserted into the feed channel 24 to ensure that the threaded blocks 33 of the two extrusion screws 3 mesh with each other.

[0060] Control the operation of power source 41 and heating device 26.

[0061] When the power source 41 is working, it can drive one of the linkage gears 39 to rotate through the gearbox 42. The linkage gears 39 mesh with each other, which can ensure that when one of the linkage gears 39 rotates, the two central rods 31 can rotate synchronously in opposite directions.

[0062] When the heating device 26 is working, it heats the outer casing 21.

[0063] Material is fed into the hopper 27, and after entering the feed channel 24, it is heated and melted. Under the rotation of the extrusion screw 3, it is mixed and finally discharged from the extrusion head 23.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An extruder for producing a modified plastic, characterized by comprising: The utility model relates to an extruder, which comprises: an extruder (2) comprising a shell (21) wrapped with a heating device (26) outside, two extrusion screws (3) rotatably installed inside the shell (21), the two extrusion screws (3) being intermeshed and the tail end of the extrusion screw (3) being connected with a driving assembly (4) through the shell (21); the extrusion screw (3) comprises a central rod (31) with a plurality of threaded blocks (33) circumferentially clamped thereon, the threaded blocks (33) being axially movable along the central rod (31), and the threaded blocks (33) being clamped with each other; the threaded block (33) is provided with a connecting sleeve (34) at the tail end, and the inner side of the head of the threaded block (33) is provided with a connecting groove (35), the connecting sleeve (34) being shorter than the connecting groove (35) in length; the connecting sleeve (34) and the connecting groove (35) of the two adjacent threaded blocks (33) are circumferentially clamped, and the connecting sleeve (34) and the connecting groove (35) can axially slide relative to each other; the central rod (31) is provided with a limiting sleeve (32) at the middle part, the connecting sleeve (34) being capable of being inserted into the limiting sleeve (32), the connecting sleeve (34) being circumferentially clamped with the limiting sleeve (32) and being capable of axially sliding relative to the limiting sleeve (32).

2. The extruder for producing a modified plastic according to claim 1, wherein: a fixing sleeve (36) is axially and slidably connected between the top of the central rod (31) and the threaded block (33), the fixing sleeve (36) being circumferentially clamped with the central rod (31) and the connecting groove (35) at the same time, the inner side surface of the top of the fixing sleeve (36) being abutted with the end surface of the threaded block (33).

3. The extruder for producing a modified plastic according to claim 2, wherein: the end surface of the fixing sleeve (36) is provided with a taper head (37), the taper head screw (38) being provided at the middle part of the end surface of the taper head (37), the taper head screw (38) being threadedly connected with the central rod (31) through the fixing sleeve (36), and the end surface of the taper head (37) being abutted with the end surface of the threaded block (33).

4. The extruder for producing a modified plastic according to claim 3, wherein: the central rod (31) is circumferentially clamped with a linkage gear (39) at the tail end, the two linkage gears (39) being intermeshed, and one of the linkage gears (39) being connected with the driving assembly (4).

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