Screen changer for plastic extruder

Abstract

The utility model discloses a screen exchanger for a plastic extruder, which comprises a mounting shell and an extruding machine port, and the extruding machine port is mounted at the front end of the mounting shell; the holding rod is arranged at the rear end of the mounting shell, an upper bevel gear is mounted at the outer end of the holding rod, a lower bevel gear is connected to the front end of the upper bevel gear, a screw rod is connected to the front end of the lower bevel gear, the outer side of the screw rod is annularly sleeved with a sleeve, a fixing ring is mounted in the sleeve, and a sealing gasket is mounted in the fixing ring; a filter screen is mounted in the sealing gasket; and the positioning rod penetrates through the upper end of the filter screen, mounting blocks are mounted at the left end and the right end of the positioning rod correspondingly, and a bolt is mounted on the outer side of the upper end of the extruding machine opening. According to the screen changer for the plastic extruder, the filter screen is convenient to disassemble, clean or replace and convenient to repeatedly clean, so that the use cost of the device is reduced, the sealing performance is high, and raw materials can be prevented from leaking in the machining process.

Description

Technical Field

[0001] This utility model relates to the field of screen changer technology, specifically a screen changer for a plastic extruder. Background Technology

[0002] Plastic extruders are used to plasticize and mold plastics. The extruder heats the raw material to turn the solid material into a uniform viscous fluid. Under the action of the extrusion mechanism of the extruder, the molten material is continuously extruded from the die head at a certain pressure and speed to become the desired plastic part. The screen changer is usually installed in the die head of the plastic extruder.

[0003] CN 103935016 A discloses a screen changer for a plastic extruder. It includes a first die plate and a second die plate connected together, a filter plate disposed between the first and second die plates, and a sealing element disposed between the second die plate and the filter plate. A sealing ring, comprising multiple separable sealing blocks, is also disposed between the second die plate and the filter plate. When molten material flows through the screen changer, the material exerts pressure on the sealing ring, causing it to expand. The sealing blocks disperse and press against the sealing element. The inclined surface of the bell mouth pushes the sealing element, causing the sealing blocks and the sealing element to press and move against each other, thus tightly sealing the various components of the screen changer and filling the gap between the two die plates. This achieves a sealing effect, solves the problem of material leakage in the screen changer, eliminates the need for manual cleaning and maintenance, saves costs, and improves efficiency.

[0004] The existing technical solutions described above have the following drawbacks: the screen changer is not easy to disassemble, is not thoroughly cleaned, cannot replace the filter screen, cannot repeatedly clean the filter screen, has high operating costs, weak sealing, and raw materials may leak during processing. Therefore, this utility model provides a screen changer for a plastic extruder to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this utility model is to provide a screen changer for a plastic extruder, so as to solve the problems mentioned in the background art, such as the screen changer being inconvenient to disassemble, not being thoroughly cleaned, being unable to replace the filter screen, being unable to repeatedly clean the filter screen, having high operating costs, weak sealing, and raw material leakage during processing.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a screen changer for a plastic extruder, comprising a mounting shell and an extrusion port, wherein the extrusion port is mounted on the front end of the mounting shell;

[0007] Also includes:

[0008] A handle is located at the rear end of the mounting housing. An upper conical tooth is installed on the outer end of the handle, and a lower conical tooth is connected to the front end of the upper conical tooth. A screw is connected to the front end of the lower conical tooth. A sleeve is sleeved around the outer side of the screw, and a fixing ring is installed inside the sleeve. A sealing gasket is installed inside the fixing ring, and a filter screen is installed inside the sealing gasket.

[0009] A positioning rod extends through the upper end of the filter screen. Mounting blocks are installed at both ends of the positioning rod. A bolt is installed on the outer side of the upper end of the extrusion port, and a nut is connected to the lower end of the bolt. A positioning key is installed at the front end of the extrusion port, and a spring is provided at the outer end of the positioning key.

[0010] Preferably, two upper conical teeth are symmetrically installed at the left and right ends of the grip, and the lower ends of the upper conical teeth are connected to the lower conical teeth in an engaging manner.

[0011] Preferably, the screw passes through the interior of the sleeve, and the interior of the screw is connected to the sleeve by a thread.

[0012] Preferably, the upper end of the filter screen and the fixing ring form a rotating structure, and the lower end of the filter screen and the fixing ring are connected by a snap-fit ​​method.

[0013] Preferably, the front end of the fixing ring is symmetrically provided with slots that fit the inner protrusion of the positioning key, and the interior of the positioning key is connected to the fixing ring by a snap-fit ​​method.

[0014] Preferably, the positioning keys are symmetrically arranged about the central axis of the extruder opening, and the positioning keys form a sliding structure inside the extruder opening.

[0015] Compared with the prior art, the beneficial effects of this utility model are: the screen changer for plastic extruder is easy to disassemble, clean or replace the filter screen, and it is easy to clean the filter screen repeatedly, thereby reducing the operating cost of the device. It has strong sealing performance and can prevent raw material leakage during processing.

[0016] 1. Equipped with a screw, sleeve, and positioning key, the device allows for quick installation or removal of the filter screen as needed, facilitating cleaning or replacement and making it easy to use;

[0017] 2. The device is equipped with a filter screen, a positioning rod, and a mounting block. The positioning rod can be pulled out from inside the filter screen to disassemble it for cleaning or replacement. This disassembly structure allows the filter screen to be repeatedly cleaned and reused, thereby reducing the operating cost of the device.

[0018] 3. It is equipped with a fixing ring, a sealing gasket, and a filter screen. The sealing gasket is placed between the fixing ring and the filter screen to prevent raw material leakage during processing, making it highly practical. Attached Figure Description

[0019] Figure 1 This is a top view sectional structural diagram of the present invention;

[0020] Figure 2 This is a side view sectional structural diagram of the present invention;

[0021] Figure 3 This utility model Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0022] Figure 4 This utility model Figure 2 Enlarged schematic diagram of the structure at point B.

[0023] In the diagram: 1. Mounting housing; 2. Extrusion nozzle; 3. Handle; 4. Upper bevel gear; 5. Lower bevel gear; 6. Screw; 7. Sleeve; 8. Retaining ring; 9. Sealing gasket; 10. Filter screen; 11. Positioning rod; 12. Mounting block; 13. Bolt; 14. Nut; 15. Positioning key; 16. Spring. Detailed Implementation

[0024] 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.

[0025] Please see Figure 1-4 This utility model provides a technical solution: a screen changer for a plastic extruder, comprising a mounting shell 1, an extruder inlet 2, a gripping rod 3, an upper conical tooth 4, a lower conical tooth 5, a screw 6, a sleeve 7, a retaining ring 8, a sealing gasket 9, a filter screen 10, a positioning rod 11, a mounting block 12, a bolt 13, a nut 14, a positioning key 15, and a spring 16.

[0026] The handle 3 is located at the rear end of the mounting shell 1. The outer end of the handle 3 is equipped with an upper conical tooth 4, and the front end of the upper conical tooth 4 is connected to a lower conical tooth 5. The front end of the lower conical tooth 5 is connected to a screw 6. The outer side of the screw 6 is fitted with a sleeve 7, and a fixing ring 8 is installed inside the sleeve 7. A sealing gasket 9 is installed inside the fixing ring 8, and a filter screen 10 is installed inside the sealing gasket 9.

[0027] The positioning rod 11 passes through the upper end of the filter screen 10. Mounting blocks 12 are installed on both the left and right ends of the positioning rod 11. Bolts 13 are installed on the outer side of the upper end of the extruder port 2, and nuts 14 are connected to the lower end of the bolts 13. A positioning key 15 is installed at the front end of the extruder port 2, and a spring 16 is provided at the outer end of the positioning key 15.

[0028] like Figure 1 and Figure 2 As shown, two upper conical teeth 4 are symmetrically installed at the left and right ends of the gripping rod 3, and the lower end of the upper conical teeth 4 is connected to the lower conical teeth 5 by meshing. The screw 6 passes through the inside of the sleeve 7, and the inside of the screw 6 is connected to the sleeve 7 by threads. The screen changer can be connected to the extruder port 2 by bolts 13 and fixed by nuts 14. When in use, the gripping rod 3 is rotated, so that the upper conical teeth 4 at the right end of the gripping rod 3 meshes with the lower conical teeth 5 and rotates. The lower conical teeth 5 drives the screw 6 to rotate, so that the sleeve 7 sleeved on the outer end of the screw 6 can move forward. When the fixing ring 8 moves forward to the inside of the extruder port 2, when the groove at the front end of the fixing ring 8 slides to the positioning key 15, the positioning key 15 engages with the front end of the fixing ring 8 to position the filter screen 10, thereby facilitating the use of the extruder. A sealing gasket 9 is provided between the fixing ring 8 and the filter screen 10. The sealing gasket 9 can prevent the raw material from leaking during the processing, which is highly practical.

[0029] like Figure 3 and Figure 4 As shown, the upper end of the filter screen 10 and the fixed ring 8 form a rotating structure, and the lower end of the filter screen 10 is connected to the fixed ring 8 by a snap-fit ​​method. The front end of the fixed ring 8 is symmetrically provided with slots that fit the protruding part of the inner end of the positioning key 15, and the inside of the positioning key 15 is connected to the fixed ring 8 by a snap-fit ​​method. The positioning key 15 is symmetrically arranged about the central axis of the extruder port 2, and the positioning key 15 forms a sliding structure inside the extruder port 2. When the screen changer has been used for a long time and a large number of ABS discolored particles are attached to the surface of the filter screen 10, making it inconvenient for extruder processing, the handle 3 can be rotated in the opposite direction, so that the lower conical tooth 5 drives the screw 6 to rotate counterclockwise and bring out the fixed ring 8, thereby facilitating the disassembly and replacement of the filter screen 10. The positioning rod 11 can be pulled out from the inside of the filter screen 10 to disassemble the filter screen 10 for cleaning or replacement with a new filter screen 10. The design of this disassembly structure allows the filter screen 10 to be repeatedly cleaned and reused, thereby reducing the operating cost of the device.

[0030] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A screen changer for plastic extruders, comprising a mounting shell (1) and an extruder port (2), wherein the extruder port (2) is mounted at the front end of the mounting shell (1); further comprising: characterized in that a handle (3) arranged at the rear end of the mounting shell (1), wherein the outer end of the handle (3) is provided with an upper bevel gear (4), the front end of the upper bevel gear (4) is connected with a lower bevel gear (5), the front end of the lower bevel gear (5) is connected with a screw rod (6), the outer side of the screw rod (6) is sleeved with a sleeve (7), the inner side of the sleeve (7) is provided with a fixing ring (8), the inner side of the fixing ring (8) is provided with a sealing gasket (9), and the inner side of the sealing gasket (9) is provided with a filter screen (10); a positioning rod (11) penetrating through the upper end of the filter screen (10), wherein the left and right ends of the positioning rod (11) are provided with mounting blocks (12), the upper end of the extruder port (2) is provided with a bolt (13), the lower end of the bolt (13) is connected with a nut (14), the front end of the extruder port (2) is provided with a positioning key (15), and the outer end of the positioning key (15) is provided with a spring (16). The left and right ends of the handle (3) are symmetrically provided with two upper bevel gears (4), and the lower end of the upper bevel gear (4) is connected with the lower bevel gear (5) in a meshing manner.

2. A screen changer for a plastic extruder according to claim 1, characterized in that: The screw rod (6) penetrates through the inner side of the sleeve (7), and the inner side of the screw rod (6) is connected with the sleeve (7) in a threaded manner.

3. A screen changer for a plastic extruder as claimed in claim 1, characterized in that: The upper end of the filter screen (10) is connected with the fixing ring (8) in a rotating manner, and the lower end of the filter screen (10) is connected with the fixing ring (8) in a clamping manner.

4. A screen changer for a plastic extruder as defined in claim 1, characterized in that: The front end of the fixing ring (8) is symmetrically provided with a slot hole matching the protruding part of the inner end of the positioning key (15), and the inner side of the positioning key (15) is connected with the fixing ring (8) in a clamping manner.

5. A screen changer for a plastic extruder as defined in claim 1, characterized in that: The positioning key (15) is symmetrically arranged about the central axis of the extruder port (2), and the positioning key (15) is connected with the extruder port (2) in a sliding manner.

6. A screen changer for a plastic extruder as defined in claim 1, characterized in that: ​

Images