Twin-screw extrusion equipment with automatic internal cleaning function

Abstract

The invention relates to twin-screw extrusion equipment with an automatic internal cleaning function, and relates to the technical field of screw extruders, the twin-screw extrusion equipment comprises an extrusion module and a machine head, a discharge channel is arranged in the machine head, a filter screen is nested in the machine head, the filter screen is arranged in the discharge channel, and a collection barrel is arranged on the machine head; a first adjusting assembly located on the upstream of the filter screen and a second adjusting assembly located on the downstream of the filter screen are arranged on the machine head, a discharging cavity and a discharging assembly are arranged on the first adjusting assembly, the discharging cavity can be communicated with the collecting barrel, and the first adjusting assembly can adjust the discharging cavity to be opposite to the filter screen; the discharging assembly can push impurity materials between the discharging cavity and the filter screen into the collecting barrel. And an air pressure assembly is arranged on the second adjusting assembly, and the air pressure assembly can transfer impurity materials blocked in meshes of the filter screen into the discharging cavity. The device has the effects that the filter screen does not need to be detached, the cleaning time of the filter screen is saved, and thus the injection molding efficiency of workpieces is improved.

Description

Technical Field

[0001] The present application relates to the technical field of screw extruders, and in particular to a twin-screw extrusion device with an automatic internal cleaning function. Background Art

[0002] A twin-screw extruder is an efficient polymer material processing device. Its core structure consists of two meshing screws and a heating barrel, and realizes the transportation, mixing and plasticization of materials through co-rotation or counter-rotation.

[0003] The filter screen at the head of the extruder is used to intercept impurities such as uncompletely melted particles, metal debris, carbides or foreign objects in the melt, and prevent them from entering the subsequent forming process. As the impurities increase, the blockage of the filter screen becomes more and more serious. Therefore, it is necessary to clean the impurity materials on the filter screen. The existing cleaning method is to stop the extruder, remove the filter screen for cleaning, and then install the filter screen on the head after cleaning, resulting in a long time for cleaning the filter screen and reducing the injection molding efficiency of workpieces. Summary of the Invention

[0004] In order to improve the problem that it takes a long time to clean the filter screen and reduces the injection molding efficiency of workpieces, the present application provides a twin-screw extrusion device with an automatic internal cleaning function.

[0005] The twin-screw extrusion device with an automatic internal cleaning function provided by the present application adopts the following technical solutions: A twin-screw extrusion device with an automatic internal cleaning function includes an extrusion module and a head. An outlet channel communicating with the material cavity of the extrusion module is provided in the head. A filter screen is nested in the head. The filter screen is arranged in the outlet channel to be able to filter materials. A collection cylinder is provided on the head; A first adjustment component located upstream of the filter screen and a second adjustment component located downstream of the filter screen are provided on the head. An outlet cavity and an outlet component are provided on the first adjustment component. The outlet cavity can communicate with the collection cylinder. The first adjustment component can adjust the outlet cavity to face the filter screen. The outlet component can push the impurity materials between the outlet cavity and the filter screen into the collection cylinder; A pneumatic component is provided on the second adjustment component. The second adjustment component can adjust the pneumatic component to face the filter screen. The pneumatic component can transfer the impurity materials blocking the mesh holes of the filter screen into the outlet cavity.

[0006] By adopting the above technical solution, when cleaning the impurity material in front of the filter screen, the discharge of the extruder is paused. The first adjustment component adjusts the discharge cavity to face the filter screen, and the second adjustment component adjusts the air pressure component to face the filter screen. The air pressure component conveys high-pressure gas towards the filter screen, pressing the blocked impurity material in the filter screen into the discharge cavity. Then, the discharge component pushes the impurity material through the discharge cavity into the collection cylinder for collection, realizing the cleaning of the impurity material on the filter screen. Compared with the prior art, this solution does not require the disassembly of the filter screen, saving the cleaning time of the filter screen, thereby improving the injection molding efficiency of the workpiece.

[0007] Preferably, the first adjustment component includes a first adjustment cylinder rotatably inserted into the head, and the front end face of the filter screen is an arc surface that fits the cylindrical surface of the first adjustment cylinder.

[0008] By adopting the above technical solution, the fitting of the first adjustment cylinder and the front end face of the filter screen is used to reduce the range of the cleaning dead angle, thereby reducing the residue of the impurity material in front of the filter screen and making the cleaning of the impurity material more thorough.

[0009] Preferably, the first adjustment cylinder is provided with a first intermediate channel and a first channel; The discharge cavity includes a second intermediate channel and a discharge port. The first intermediate channel faces the discharge channel, the second intermediate channel faces the filter screen, the first channel can communicate with the first intermediate channel and the second intermediate channel so that the material flows towards the filter screen, and the second intermediate channel can communicate with the discharge port so that the impurity material can move to the collection cylinder.

[0010] By adopting the above technical solution, the flow path formed by the first intermediate channel, the first channel, and the second intermediate channel is used to ensure that the material can flow stably towards the filter screen, and relying on the impurity material flow path formed by the second intermediate channel and the discharge port, the stable discharge of the impurity material is ensured.

[0011] Preferably, the first adjustment cylinder is provided with a communication ring groove that can communicate with the discharge channel. The rotation axis of the communication ring groove is collinear with the rotation axis of the first adjustment cylinder. Both ends of the first channel are communicated with the communication ring groove. Two blocking parts inserted into the communication ring groove are fixedly arranged on the head. Both blocking parts are slidably sealed with the communication ring groove and form the first intermediate channel facing the discharge channel and the second intermediate channel facing the filter screen; when the first intermediate channel, the first channel, and the second intermediate channel are communicated, the discharge port is disconnected from the second intermediate channel, and when the discharge port is communicated with the second intermediate channel, the first channel is disconnected from the first intermediate channel and the second intermediate channel.

[0012] By adopting the above technical solution, the first intermediate channel and the second intermediate channel are formed by using the connecting annular groove and the blocking part, ensuring that the material can normally flow from the discharge channel through the first intermediate channel, the first channel, and the second intermediate channel to the filter screen; and when the material flows, the discharge port is disconnected from the second intermediate channel, thereby separating the impurity material from the normal material, reducing the amount of normal material discharged into the collection cylinder, and reducing the loss of the material. Rotating the first adjustment cylinder realizes the on-off of the channel for the material to flow to the filter screen channel and the channel for the impurity material to flow to the collection cylinder, improving the convenience of adjusting the material flow and cleaning the impurity material.

[0013] Preferably, the discharge assembly includes an extrusion plate and a linear drive mechanism. The extrusion plate is slidably arranged on the first adjustment cylinder. The linear drive mechanism is connected to the extrusion plate and can drive the extrusion plate to extrude the impurity material. The first adjustment cylinder can drive the extrusion plate to be opposite to the second intermediate channel; When the second intermediate channel is in relative communication with the discharge port, the extrusion plate can push the impurity material through the discharge port into the collection cylinder.

[0014] By adopting the above technical solution, when cleaning the impurity material, the linear drive mechanism drives the extrusion plate to press down the impurity material in the second intermediate channel to the discharge port and discharge it into the collection cylinder through the discharge port, completing the cleaning of the impurity material.

[0015] Preferably, the second adjustment assembly includes a second adjustment cylinder rotatably inserted into the machine head. The second adjustment cylinder is provided with a second channel capable of communicating with the discharge channel; The air pressure assembly includes an air pump and an air pipe. A gas channel is arranged in the second adjustment cylinder. The air pump is connected to the inlet end of the gas channel through the air pipe, and the outlet end of the gas channel can be opposite to the filter screen.

[0016] By adopting the above technical solution, the air pump can transport high-pressure gas into the gas channel in the second adjustment cylinder through the air pipe. When the outlet end of the gas channel is opposite to the filter screen, the impurity material that is likely to block the filter screen can be transferred to the discharge cavity, making the cleaning of the impurity material on the filter screen more thorough and reducing the residue of the impurity material on the filter screen.

[0017] Preferably, a pressure chamber is formed on the circumferential side wall of the second adjustment cylinder. The outlet end of the gas channel is communicated with the pressure chamber, and the pressure chamber can be opposite to the filter screen.

[0018] By adopting the above technical solution, the setting of the pressure chamber can increase the cleaning area of the high-pressure gas on the filter screen, making the cleaning of the impurity material on the filter screen more thorough.

[0019] Preferably, a pressure relief valve is provided on the collection cylinder.

[0020] By adopting the above technical solution, the pressure relief valve performs a pressure relief operation on the collection cylinder, thereby maintaining the pressure stability in the collection cylinder and ensuring that the impurity materials can be stably discharged into the collection cylinder.

[0021] Preferably, a first driving motor and a second driving motor are provided on the machine head. The output shaft of the first driving motor is coaxially and fixedly connected to the first adjusting cylinder, and the output shaft of the second driving motor is coaxially and fixedly connected to the second adjusting cylinder.

[0022] By adopting the above technical solution, the first driving motor can accurately drive the first adjusting cylinder to rotate, facilitating the adjustment of the relative position between the discharge cavity and the filter screen. The second driving motor can accurately drive the second adjusting cylinder to rotate, facilitating the adjustment of the relative position between the air pressure assembly and the filter screen.

[0023] Preferably, encoders are provided on both the first adjusting cylinder and the second adjusting cylinder.

[0024] By adopting the above technical solution, the encoder can accurately feedback the rotation position and angle information of the first adjusting cylinder and the second adjusting cylinder, enabling the device to accurately control the rotation of the two according to the actual situation, and then more accurately adjust the relative positions of the discharge cavity, the air pressure assembly and the filter screen, improving the accuracy and working efficiency of cleaning the impurity materials.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. When cleaning the impurity materials in front of the filter screen, the first adjustment assembly adjusts the discharge cavity relative to the filter screen, and the second adjustment assembly adjusts the air pressure assembly relative to the filter screen. The air pressure assembly conveys high-pressure gas towards the filter screen, pressing the blocked impurity materials in the filter screen into the discharge cavity, and then the discharge assembly pushes the impurity materials through the discharge cavity into the collection cylinder for collection, realizing the cleaning of the impurity materials on the filter screen. Compared with the prior art, this solution does not require the disassembly of the filter screen, saving the cleaning time of the filter screen, thereby improving the injection molding efficiency of the workpiece; 2. The air pump can convey high-pressure gas into the gas passage in the second adjusting cylinder through the ventilation pipe. When the air outlet end of the gas passage faces the filter screen, the impurity materials that are likely to block the filter screen can be transferred into the discharge cavity, making the cleaning of the impurity materials on the filter screen more thorough and reducing the residue of the impurity materials on the filter screen; 3. The pressure relief valve performs a pressure relief operation on the collection cylinder, thereby maintaining the pressure stability in the collection cylinder and ensuring that the impurity materials can be stably discharged into the collection cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a twin-screw extrusion device with an automatic internal cleaning function according to an embodiment of the present application.

[0027] Figure 2 It is a schematic structural diagram for showing the head structure.

[0028] Figure 3 It is a top view for showing the head structure.

[0029] Figure 4 It is a sectional view along Figure 3 the A-A line in

[0030] Figure 5 It is a schematic structural diagram for showing the filter net.

[0031] Figure 6 It is a front view for showing the head structure.

[0032] Figure 7 It is a sectional view along Figure 6 the B-B line in

[0033] Figure 8 It is a sectional view along Figure 3 the C-C line in

[0034] Figure 9 It is a schematic structural diagram for showing the positional relationship between the extrusion plate and the discharge port.

[0035] Figure 10 It is a sectional view along Figure 3 the D-D line in

[0036] Explanation of reference numerals: 1. Extrusion module; 2. Head; 21. Discharge channel; 22. Mounting hole; 23. Motor frame; 24. Encoder; 3. Filter net; 31. Net body; 32. Ear plate; 4. First adjustment assembly; 41. First adjusting cylinder; 411. Communicating ring groove; 412. Blocking portion; 413. First intermediate channel; 414. Second intermediate channel; 415. First channel; 42. First driving motor; 5. Second adjustment assembly; 51. Second adjusting cylinder; 511. Second channel; 512. Pressing cavity; 52. Second driving motor; 6. Discharge cavity; 61. Discharge port; 7. Discharge assembly; 71. Extrusion plate; 72. Linear driving mechanism; 74. Connecting rod; 8. Collection cylinder; 81. Pressure relief valve; 9. Pneumatic assembly; 91. Air pump; 92. Vent pipe; 93. Gas channel. Detailed implementation manners

[0037] The following further describes the present application in detail in conjunction with Figures 1-10 the accompanying drawings.

[0038] The embodiment of the present application discloses a twin-screw extrusion device with an automatic internal cleaning function.

[0039] Refer to Figure 1, Figure 2 , a twin-screw extrusion device with an automatic internal cleaning function includes an extrusion module 1 and a head 2. An outlet channel 21 communicating with the material cavity of the extrusion module 1 is provided in the head 2. The extrusion module 1 uses twin screws to extrude and melt the material in the material cavity.

[0040] Referring to Figure 3 , Figure 4 , a filter screen 3 is nested in the head 2. The head 2 is composed of two parts spliced together. The filter screen 3 is installed at the splicing position of the two parts of the head 2, which is convenient for installing the filter screen 3. The filter screen 3 is arranged in the outlet channel 21 and covers the entire cross-section of the outlet channel 21, so as to realize the filtration of the material.

[0041] Referring to Figure 2 , a first adjustment component 4 located upstream of the filter screen 3 and a second adjustment component 5 located downstream of the filter screen 3 on the head 2. An outlet cavity 6 (as shown in the appendix Figure 8 ) and an outlet component 7 are provided on the first adjustment component 4. The outlet cavity 6 can communicate with the collection cylinder 8. The first adjustment component 4 can adjust the outlet cavity 6 to face the filter screen 3. A collection cylinder 8 is fixedly provided below the first adjustment component 4 on the head 2. A pressure relief valve 81 is installed on the collection cylinder 8 to ensure the stability of the pressure in the collection cylinder 8. The outlet component 7 can push the impurity material between the outlet cavity and the filter screen 3 into the collection cylinder 8.

[0042] Referring to Figure 2 , a pneumatic component 9 is provided on the second adjustment component 5. The second adjustment component 5 can adjust the pneumatic component 9 to face the filter screen 3. The pneumatic component 9 can transfer the impurity material blocking the mesh holes of the filter screen 3 into the outlet cavity 6.

[0043] When cleaning the impurity material in front of the filter screen 3, the extrusion machine is paused from discharging. The first adjustment component 4 adjusts the outlet cavity 6 to face the filter screen 3, and the second adjustment component 5 adjusts the pneumatic component 9 to face the filter screen 3. The pneumatic component 9 conveys high-pressure gas towards the filter screen 3, pressing the impurity material blocked in the filter screen 3 into the outlet cavity 6, and then the outlet component 7 pushes the impurity material through the outlet cavity 6 into the collection cylinder 8 for collection, realizing the cleaning of the impurity material on the filter screen 3. Compared with the prior art, this solution does not require the filter screen 3 to be disassembled, saving the cleaning time of the filter screen 3, thereby improving the injection efficiency of the workpiece.

[0044] Referring to Figure 4 , Figure 5, in this embodiment, the filter screen 3 includes a screen body 31 and ear plates 32 on both sides of the screen body 31. The mesh holes are provided on the screen body 31, and the screen body 31 faces the discharge. The ear plates 32 are embedded into the machine head 2, so that the installation between the filter screen 3 and the machine head 2 is completed. The front and rear end faces of the screen body 31 are arranged in parallel, and the projection of the front end face of the screen body 31 on the horizontal plane is an arc segment with a radius of R. There are two vertically arranged mounting holes 22 on the machine head 2. One mounting hole 22 is located upstream of the filter screen 3, and the other mounting hole 22 is located downstream of the filter screen 3. The radii of both mounting holes 22 are R. Each mounting hole 22 penetrates through the top wall and the bottom wall of the machine head 2. The rotation axis of the mounting hole 22 is perpendicular to and intersects with the rotation axis of the discharge channel 21, and the radius of the mounting hole 22 is larger than the radius of the discharge channel 21. The front end face of the screen body 31 is concentrically arranged with the mounting hole 22.

[0045] Refer to Figure 4 , the first adjustment assembly 4 includes a first adjustment cylinder 41, and the second adjustment assembly 5 includes a second adjustment cylinder 51. The first adjustment cylinder 41 is inserted into the mounting hole 22 located upstream and is connected with the mounting hole 22 by interference fit. The second adjustment cylinder 51 is inserted into the mounting hole 22 located downstream and is connected with the mounting hole 22 by interference fit. Above the first adjustment cylinder 41 and the second adjustment cylinder 51 on the machine head 2, there is a motor bracket 23. A first driving motor 42 and a second driving motor 52 are provided on the motor bracket 23. Both the first driving motor 42 and the second driving motor 52 are servo motors. The output shaft of the first driving motor 42 is connected with the first adjustment cylinder 41 through a coupling, and the output shaft of the second driving motor 52 is connected with the second adjustment cylinder 51 through a coupling.

[0046] Refer to Figure 4 , an encoder 24 is installed on each coupling. The encoder 24 can accurately feedback the rotation position and angle information of the first adjustment cylinder 41 and the second adjustment cylinder 51, so that the device can accurately control the rotation of the two according to the actual situation, and further more accurately adjust the relative positions of the discharge cavity 6, the air pressure assembly 9 and the filter screen 3, improving the accuracy and working efficiency of cleaning impurity materials.

[0047] Refer to Figure 6 , Figure 7 , a communicating ring groove 411 is provided on the first adjustment cylinder 41. The communicating ring groove 411 is arranged in a circle along the circumferential direction of the first adjustment cylinder 41. When the first adjustment cylinder 41 is installed in the corresponding mounting hole 22, the communicating ring groove 411 faces the discharge channel 21. The side wall of the communicating ring groove 411 located below is composed of a sleeve detachably sleeved on the first adjustment cylinder 41, so that the first adjustment cylinder 41 is composed of two parts spliced together. The height of the communicating ring groove 411 is equal to the diameter of the discharge channel 21.

[0048] Refer to Figure 7, Figure 8 , on the hole wall of the mounting hole 22 located upstream, two blocking portions 412 are fixedly provided. The two blocking portions 412 are arranged oppositely, and the two blocking portions 412 are arc-shaped. When the first adjusting cylinder 41 is installed into the corresponding mounting hole 22, both of the two blocking portions 412 are inserted into the communication ring groove 411, and the inner wall of the blocking portion 412 fits with the bottom wall of the communication ring groove 411. A first intermediate channel 413 opposite to the discharge channel 21 and a second intermediate channel 414 opposite to the filter screen 3 are formed between the two blocking portions 412. The cross-sections of the first intermediate channel 413 and the second intermediate channel 414 are both square. A first channel 415 is provided on the first adjusting cylinder 41. The cross-section of the first channel 415 is circular. The axis of the first channel 415 is arranged along the radial direction of the first adjusting cylinder 41. The first channel 415 can be opposite to the discharge channel 21. The diameter of the first channel 415, the widths of the first intermediate channel 413 and the second intermediate channel 414 are all the same as the diameter of the discharge channel 21.

[0049] Refer to Figure 8 , Figure 9 , the discharge cavity 6 includes the second intermediate channel 414 and a discharge port 61. The discharge port 61 is located on a sleeve sleeved on the first adjusting cylinder 41. The discharge port 61 is arranged along the axial direction of the first adjusting cylinder 41. One end of the discharge port 61 penetrates through the side wall below the communication ring groove 411, and the other end penetrates through the bottom end wall of the first adjusting cylinder 41. The symmetry plane of the discharge port 61 in the vertical direction is perpendicularly arranged to the symmetry plane of the first channel 415 in this direction.

[0050] When the first intermediate channel 413, the first channel 415, and the second intermediate channel 414 are communicated, the discharge port 61 is disconnected from the second intermediate channel 414. When the second intermediate channel 414 is communicated with the discharge port 61, the first channel 415 is disconnected from the first intermediate channel 413 and the second intermediate channel 414.

[0051] When the extruder is working normally, the first intermediate channel 413, the first channel 415, and the second intermediate channel 414 are all arranged opposite to the discharge channel 21, so that the material can flow along the discharge channel 21, the first intermediate channel 413, the first channel 415, and the second intermediate channel 414 to the filter screen 3 for filtering. When the material passes through the mesh body 31, the impurity material is blocked in the second intermediate channel 414 in front of the mesh body 31. Therefore, it is necessary to clean the impurity material collected in front of the filter screen 3. When it is necessary to clean the impurity material, the first driving motor 42 drives the first adjusting cylinder 41 to rotate 90°, so that the discharge port 61 is communicated with the second intermediate channel 414, and the first channel 415 is disconnected from the first intermediate channel 413 and the second intermediate channel 414. At this time, the material in the second intermediate channel 414 can be cleaned along the discharge port 61 into the collection cylinder 8.

[0052] The first intermediate channel 413 and the second intermediate channel 414 are formed by connecting the annular groove 411 and the blocking portion 412, ensuring that the material can flow normally from the discharge channel 21 through the first intermediate channel 413, the first channel 415, and the second intermediate channel 414 to the filter screen 3. And when the material is flowing, the discharge port 61 is disconnected from the second intermediate channel 414, thereby separating the impurity material from the normal material, reducing the amount of material discharged into the collection cylinder 8 for normal material, and reducing the loss of material. By rotating the first adjustment cylinder 41, the on-off of the channel for the material to flow to the filter screen 3 and the channel for the impurity material to flow to the collection cylinder 8 is realized, improving the convenience of adjusting the material flow and cleaning the impurity material.

[0053] Referring to Figure 8 、 Figure 9 , the discharge assembly 7 includes a pressing plate 71 and a linear driving mechanism 72. The linear driving mechanism 72 in this embodiment is a linear cylinder. The cylinder body of the linear driving mechanism 72 is fixedly installed on the end face of the first adjustment cylinder 41. The piston rod of the linear driving mechanism 72 is arranged vertically upward. A connecting rod 74 is fixedly connected to the piston rod of the linear driving mechanism 72. The pressing plate 71 is an arc-shaped plate adapted to the second intermediate channel 414 and the discharge port 61. The pressing plate 71 is slidably embedded in the top side wall of the connecting annular groove 411. The pressing plate 71 is disposed opposite to the discharge port 61. The end of the connecting rod 74 is inserted into the first adjustment cylinder 41 and fixedly connected to the pressing plate 71.

[0054] When cleaning the impurity material, the first adjustment cylinder 41 drives the discharge port 61 to rotate to a position opposite to the second intermediate channel 414. At this time, the pressing plate 71 also rotates to a position opposite to the second intermediate channel 414. The linear driving mechanism 72 drives the pressing plate 71 to press the impurity material in the second intermediate channel 414 down to the discharge port 61 and discharges it into the collection cylinder 8 through the discharge port 61, completing the cleaning of the impurity material.

[0055] Referring to Figure 4 、 Figure 7 , a second channel 511 is formed in the second adjustment cylinder 51. The cross-section of the second channel 511 is circular. Both ends of the second channel 511 penetrate through the outer peripheral wall of the second adjustment cylinder 51. Both ends of the second channel 511 can be simultaneously opposite to the downstream discharge channel 21 and the upstream discharge channel 21, so that the material flows into the downstream discharge channel 21 along the second channel 511. A pressure chamber 512 is formed on the peripheral side wall of the second adjustment cylinder 51. When the second channel 511 is opposite to the discharge channel 21, the pressure chamber 512 is disconnected from the discharge channel 21. When the pressure chamber 512 is opposite to the upstream discharge channel 21, the second channel 511 is disconnected from the discharge channel 21.

[0056] Referring to Figure 2 、 Figure 10, the air pressure assembly 9 includes an air pump 91 and an air pipe 92. A gas passage 93 is provided in the second adjusting cylinder 51. The air pump 91 is connected to the inlet end of the gas passage 93 through the flexible air pipe 92, and the outlet end of the gas passage 93 is disposed opposite to the pressure chamber 512.

[0057] Part of the impurity material will be stuck in the sieve holes of the filter screen 3. When cleaning the impurity material in the sieve holes of the filter screen 3, rotate the second adjusting cylinder 51 so that the pressure chamber 512 faces the filter screen 3, and then start the air pump 91. The air pump 91 conveys high-pressure gas to the gas passage 93 in the second adjusting cylinder 51 through the air pipe 92, and enters the pressure chamber 512 through the gas passage 93, so that there is a pressure difference before and after the filter screen 3. The pressure difference is used to transfer the easily blocked impurity material of the filter screen 3 to the second intermediate passage 414, and then the impurity material in the second intermediate passage 414 is cleaned by the pressing plate 71, so that the impurity material on the filter screen 3 is cleaned more thoroughly, and the residue of the impurity material on the filter screen 3 is reduced.

[0058] The implementation principle of the twin-screw extrusion equipment with an automatic internal cleaning function in the embodiment of the present application is as follows: when the extruder discharges materials normally, the first intermediate passage 413, the first passage 415, the second intermediate passage 414, and the second passage 511 are all disposed opposite to the discharge passage 21, so that the material can flow along the discharge passage 21, the first intermediate passage 413, the first passage 415, and the second intermediate passage 414 to the filter screen 3 for filtration, and the filtered material flows through the second passage 511 and the discharge passage 21 to the outlet of the head 2.

[0059] When it is necessary to clean the impurity material on the filter screen 3, the first driving motor 42 drives the first adjusting cylinder 41 to rotate 90°, so that the discharge port 61 is communicated with the second intermediate passage 414, and the first passage 415 is disconnected from the first intermediate passage 413 and the second intermediate passage 414. Then, the second driving motor 52 drives the second adjusting cylinder 51 to rotate, so that the pressure chamber 512 faces the filter screen 3, and then the air pump 91 is started. The air pump 91 conveys high-pressure gas to the gas passage 93 in the second adjusting cylinder 51 through the air pipe 92, and enters the pressure chamber 512 through the gas passage 93, so that there is a pressure difference before and after the filter screen 3. The pressure difference is used to transfer the easily blocked impurity material of the filter screen 3 to the second intermediate passage 414, and then the linear driving mechanism 72 is started. The linear driving mechanism 72 drives the pressing plate 71 to press the impurity material in the second intermediate passage 414 down to the discharge port 61, and discharges it into the collection cylinder 8 through the discharge port 61, completing the cleaning of the impurity material. This solution does not require the disassembly of the filter screen 3, saves the cleaning time of the filter screen 3, and thus improves the injection molding efficiency of the workpiece.

[0060] After the cleaning is completed, the extrusion plate 71 resets, and the first driving motor 42 drives the first adjusting cylinder 41 to rotate, so that the discharge channel 21, the first intermediate channel 413, the first channel 415, and the second intermediate channel 414 are opposite and communicated. The second driving motor 52 drives the second adjusting cylinder 51 to rotate, so that the second channel 511 is opposite and communicated with the discharge channel 21, enabling the extruder to discharge materials normally.

[0061] The above are all preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A twin-screw extruder with automatic internal cleaning function, characterized in that: The invention comprises an extrusion module (1) and a die (2); a discharge channel (21) is provided in the die (2) and is connected to a material cavity of the extrusion module (1); a filter screen (3) is nested in the die (2); the filter screen (3) is arranged in the discharge channel (21) so as to filter the material; and a collecting cylinder (8) is provided on the die (2); The machine head (2) is provided with a first adjustment component (4) located upstream of the filter screen (3) and a second adjustment component (5) located downstream of the filter screen (3); the first adjustment component (4) is provided with a discharge chamber (6) and a discharge component (7); the discharge chamber (6) is capable of communicating with the collecting barrel (8); the first adjustment component (4) is capable of adjusting the discharge chamber (6) to be relative to the filter screen (3); and the discharge component (7) is capable of pushing foreign materials between the discharge chamber (6) and the filter screen (3) into the collecting barrel (8); The second adjustment component (5) is provided with a pneumatic component (9), and the second adjustment component (5) is capable of adjusting the pneumatic component (9) relative to the filter screen (3), and the pneumatic component (9) is capable of transferring foreign materials blocked in the mesh of the filter screen (3) to the discharge chamber (6).

2. The twin-screw extruder with automatic internal cleaning function according to claim 1, characterized in that: The first adjustment component (4) comprises a first adjustment cylinder (41) rotatably inserted into the machine head (2), and the front end surface of the filter screen (3) is an arc-shaped surface that fits the cylindrical surface of the first adjustment cylinder (41).

3. The twin-screw extruder with automatic internal cleaning function according to claim 2, characterized in that: The first adjusting cylinder (41) is provided with a first intermediate channel (413) and a first channel (415); The discharge chamber (6) comprises a second intermediate channel (414) and a discharge port (61); the first intermediate channel (413) is opposite to the discharge channel (21); the second intermediate channel (414) is opposite to the filter screen (3); the first channel (415) can be connected to the first intermediate channel (413) and the second intermediate channel (414) so ​​that the material flows to the filter screen (3); the second intermediate channel (414) can be connected to the discharge port (61) so that the impurity material can move to the collection cylinder (8).

4. The twin-screw extruder with automatic internal cleaning function according to claim 3, characterized in that: The first adjusting cylinder (41) is provided with a connecting annular groove (411) capable of communicating with the discharge channel (21); the rotation axis of the connecting annular groove (411) is colinear with the rotation axis of the first adjusting cylinder (41); both ends of the first channel (415) are connected with the connecting annular groove (411); two blocking parts (412) inserted into the connecting annular groove (411) are fixedly provided on the machine head (2); the two blocking parts (412) are slidably sealedly connected with the connecting annular groove (411), and form the first intermediate channel (413) opposite to the discharge channel (21) and the second intermediate channel (414) opposite to the filter screen (3); When the first intermediate channel (413), the first channel (415), and the second intermediate channel (414) are connected, the discharge port (61) is disconnected from the second intermediate channel (414); when the discharge port (61) is connected to the second intermediate channel (414), the first channel (415) is disconnected from the first intermediate channel (413) and the second intermediate channel (414).

5. The twin-screw extruder with automatic internal cleaning function according to claim 3, characterized in that: The discharge assembly (7) comprises an extrusion plate (71) and a linear drive mechanism (72); the extrusion plate (71) is slidably disposed on the first adjusting cylinder (41); the linear drive mechanism (72) is connected to the extrusion plate (71) and is capable of driving the extrusion plate (71) to extrude foreign materials; and the first adjusting cylinder (41) is capable of driving the extrusion plate (71) to face the second intermediate channel (414); When the second intermediate channel (414) is in relative communication with the discharge port (61), the extrusion plate (71) can push the foreign material through the discharge port (61) to the collecting cylinder (8).

6. The twin-screw extruder with automatic internal cleaning function according to claim 2, characterized in that: The second adjustment component (5) comprises a second adjustment cylinder (51) rotatably inserted into the machine head (2), and the second adjustment cylinder (51) is provided with a second channel (511) capable of communicating with the discharge channel (21); The air pressure component (9) comprises an air pump (91) and a vent pipe (92); a gas channel (93) is provided inside the second adjustment cylinder (51); the air pump (91) is connected to the inlet end of the gas channel (93) through the vent pipe (92); and the gas outlet end of the gas channel (93) can be opposite to the filter screen (3).

7. The twin-screw extruder with automatic internal cleaning function according to claim 6, characterized in that: A pressure chamber (512) is provided on the peripheral side wall of the second adjustment cylinder (51), the outlet end of the gas channel (93) is connected to the pressure chamber (512), and the pressure chamber (512) can be opposite to the filter screen (3).

8. The twin-screw extruder with automatic internal cleaning function according to claim 1, characterized in that: The collecting cylinder (8) is provided with a pressure relief valve (81).

9. The twin-screw extruder with automatic internal cleaning function according to claim 6, characterized in that: The machine head (2) is provided with a first drive motor (42) and a second drive motor (52); the output shaft of the first drive motor (42) is coaxially fixedly connected to the first adjustment cylinder (41); and the output shaft of the second drive motor (52) is coaxially fixedly connected to the second adjustment cylinder (51).

10. The twin-screw extruder with automatic internal cleaning function according to claim 9, characterized in that: Encoders (24) are provided on both the first adjustment cylinder (41) and the second adjustment cylinder (51).

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