Feed inlet anti-blocking structure and extruder

Abstract

The utility model relates to the technical field of extruders, and discloses a feed inlet anti-blocking structure and an extruder, and the feed inlet anti-blocking structure comprises a hopper provided with a feed inlet; the screening device is arranged on one side of the hopper, the discharging end of the screening device communicates with the feeding port, the screening device is used for screening unqualified materials in the raw materials and conveying the screened raw materials into the hopper, and the screening device is provided with a discharging port for discharging the unqualified materials; the blanking port baffle blocks the blanking port and is connected with the blanking port in an openable and closable manner so as to open or close the blanking port; and the recovery device is arranged corresponding to the blanking port and is used for recovering unqualified materials. Raw materials pass through the screening device before entering the feeding port, unqualified materials are screened out, the discharging port is opened, the unqualified materials fall into the recycling device, other materials are fed into the feeding port, and therefore the unqualified materials mixed in the raw materials are screened and recycled, the situation that hard objects in the raw materials enter the hopper, and consequently a screw rod is clamped is avoided, and the service life of the raw materials is prolonged. And efficient and reliable work of equipment is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders, in particular to a feed port anti-blocking structure and an extruder. Background Art

[0002] An extruder is a mechanical device that relies on pressure and shear forces to fully plasticize and evenly mix materials before passing them through a die. It is widely used in the plastics industry to process various thermoplastics, such as soft and rigid polyvinyl chloride (PVC) and polyethylene (PE). The design and precision of an extruder directly impact the effectiveness and efficiency of the extrusion process. Its core components are the barrel and the screw that rotates within it. The pressure and shear forces generated by the screw's rotation fully plasticize and evenly mix the materials before passing through the die to form the final product.

[0003] However, the applicant found that the traditional extruder still has the following shortcomings during use:

[0004] A forced feeder is usually installed on the top of the extruder to transport the raw materials into the barrel at a uniform speed. Since the raw materials entering the forced feeder may be mixed with some hard objects made of metal or non-metal materials, these hard objects enter the barrel through the extruder feed port, causing the screw to get stuck, thereby causing equipment failure. Utility Model Content

[0005] In view of this, the utility model provides a feed port anti-blocking structure and an extruder to solve or improve the problem in the related art that raw materials enter the feed port of the extruder, and the mixed hard objects therein easily cause the screw in the barrel to get stuck, resulting in equipment failure.

[0006] In a first aspect, the utility model provides a feed inlet anti-blocking structure, comprising:

[0007] A hopper having a feed port;

[0008] a screening device, disposed on one side of the hopper, wherein the discharge end of the screening device is connected to the feed port, the screening device is used to screen unqualified materials mixed in the raw materials and convey the screened raw materials into the hopper, and the screening device is provided with a discharge port for discharging the unqualified materials;

[0009] A blanking port baffle is sealed at the blanking port, and the blanking port baffle is connected to the blanking port in an openable and closable manner to open or close the blanking port;

[0010] A recovery device is provided corresponding to the material drop opening, and the recovery device is used to recover the unqualified material discharged from the material drop opening.

[0011] In an optional embodiment, the screening device includes:

[0012] A sieve plate, wherein the feed end is connected to the external feeding mechanism and the discharge end is connected to the feed port. The sieve plate is provided with the drop port, and the drop port baffle is rotatably connected to the sieve plate to open or close the drop port.

[0013] a vibrator connected to the sieve plate, the vibrator being used to drive the sieve plate to vibrate so as to screen out the unqualified materials;

[0014] A telescopic driving member, one end of which is connected to the screen plate and the other end of which is connected to the blanking port baffle, wherein the telescopic driving member is used to drive the blanking port baffle to rotate.

[0015] In an optional embodiment, the method further includes:

[0016] A visual inspection module is provided above the sieve plate and corresponding to the blanking port, and is used to detect the unqualified material and output a detection signal;

[0017] A controller is electrically connected to the visual detection module, and is used to control the operation of the telescopic drive member according to the detection signal.

[0018] In an optional embodiment, the screening device further comprises:

[0019] At least one partition is arranged on the screen plate and corresponds to the blanking port. The partitions are spaced apart along the width direction of the screen plate to divide the blanking port into at least two sub-blanking ports. The blanking port baffle and the telescopic drive member are both arranged in one-to-one correspondence with the sub-blanking ports.

[0020] In an optional embodiment, the method further includes:

[0021] A fixing member is fixedly arranged below the sieve plate, and the fixing member is provided with a through hole corresponding to the drop opening so that the unqualified material falls into the recovery device;

[0022] At least one elastic supporting member is arranged between the fixing member and the sieve plate.

[0023] In an optional embodiment, the method further includes:

[0024] a material level detection device, disposed on the recovery device, for detecting the height of the material in the recovery device, and electrically connected to the controller;

[0025] The alarm device is electrically connected to the controller, and the controller is further used to control the alarm device to issue an alarm message when it is detected that the material height is greater than or equal to a preset height.

[0026] In an optional embodiment, the method further includes:

[0027] A connecting frame is connected to the fixing member, and the connecting frame is provided with a slide groove arranged along the length direction thereof, and the recovery device is slidably arranged in the slide groove.

[0028] In an optional embodiment, the method further includes:

[0029] a stirring shaft, rotatably disposed in the hopper;

[0030] at least two stirring blades, disposed on the stirring shaft;

[0031] The stirring drive member is used to drive the stirring shaft to rotate.

[0032] In an optional embodiment, the method further includes:

[0033] A cylinder, wherein a screw is rotatably connected to the cylinder;

[0034] A feed pipe, one end of which is connected to the hopper and the other end of which is connected to the cylinder;

[0035] A spiral auger is rotatably arranged in the feed pipe, and the spiral auger is connected to the stirring shaft and rotates synchronously.

[0036] In a second aspect, the present invention further provides an extruder, comprising a feed port anti-blocking structure as described in any one of the above items.

[0037] The utility model provides a feed port anti-blocking structure. The raw materials first pass through a screening device before entering the feed port, and unqualified materials mixed therein are screened out. The drop port is opened, and the unqualified materials fall into the recovery device, and the remaining materials are sent to the feed port, thereby screening and recovering the unqualified materials mixed in the raw materials, preventing some hard objects in the raw materials from entering the hopper and causing the screw to be stuck, thereby ensuring that the equipment works efficiently and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 This is an overall schematic diagram of the feed port anti-blocking structure of an embodiment of the utility model;

[0040] Figure 2A partial cross-sectional view of the interior of the hopper according to an embodiment of the present invention;

[0041] Figure 3 This is one of the partial schematic diagrams of the screening device according to an embodiment of the present utility model;

[0042] Figure 4 This is the second partial schematic diagram of the screening device according to the embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 1. Hopper; 101. Feed port; 2. Screening device; 201. Discharge end; 202. Feed end; 203. Dropping port; 204. Screen plate; 205. Vibrator; 206. Telescopic drive member; 207. Partition; 3. Dropping port baffle; 4. Recovery device; 401. Recovery box; 402. Slider; 403. Handle; 5. Visual detection module; 6. Fixing member; 7. Elastic support member; 8. Material level detection device; 801. Infrared emission module; 802. Infrared receiving module; 9. Alarm device; 10. Connecting frame; 11. Stirring shaft; 12. Stirring blade; 13. Stirring drive member; 14. Cylinder; 15. Screw; 16. Feed pipe; 17. Auger; 18. Extruder body; 19. First fixed frame; 20. Second fixed frame; 21. Top cover; 22 Cover body; 23. Discharge pipe; 24. Support frame. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0046] The following combination Figures 1 to 4 , describing the feed port anti-blocking structure and extruder of an embodiment of the present utility model.

[0047] According to an embodiment of the present invention, on the one hand, a feed port anti-blocking structure is provided, comprising a hopper 1, a screening device 2, a feed port baffle 3, and a recovery device 4. Specifically, Figure 1 As shown, the hopper 1 is arranged on the top of the barrel 14 and can be used to store the raw materials to be processed. A second fixing frame 20 is arranged on one side of the extruder body 18, and the second fixing frame 20 is used to support and fix the hopper 1. Figure 2 As shown, the side wall of the hopper 1 is provided with a feed port 101. Figure 1As for the placement position of the feed port anti-blocking structure shown in the figure, the upper end of the cylinder 14 in the figure is the top of the cylinder 14.

[0048] See also Figures 1 to 3 The screening device 2 is arranged on one side of the hopper 1, and the discharge end 201 of the screening device 2 is connected to the feed port 101 so that the screened material can enter the hopper 1. The screening device 2 is used to screen the unqualified materials mixed in the raw materials and transport the screened raw materials into the hopper 1, and the screening device 2 is provided with a discharge port 203 for discharging unqualified materials. The discharge port baffle 3 is blocked at the discharge port 203, and the discharge port baffle 3 and the discharge port 203 can be opened and closed to open or close the discharge port 203. The recovery device 4 is arranged corresponding to the discharge port 203, and the recovery device 4 is used to recover the unqualified materials discharged from the discharge port 203.

[0049] With such arrangement, the raw materials pass through the screening device 2 before entering the feed port 101, and unqualified materials mixed therein, such as some hard objects made of metal or non-metal materials, are screened out, and the drop port 203 is opened, and the unqualified materials fall into the recovery device 4 from the drop port 203, and the remaining materials continue to be fed into the feed port 101, thereby screening and recovering the unqualified materials mixed in the raw materials, preventing some hard objects in the raw materials from entering the hopper and causing the screw to be stuck, thereby ensuring efficient and reliable operation of the equipment.

[0050] In some embodiments of the present invention, the screening device 2 includes a screening plate 204, a vibrator 205, and a telescopic drive member 206. Figure 3 As shown, the feed end 202 of the sieve plate 204 is connected to an external feeding mechanism such as a feeder. Specifically, a discharge pipe 23 is provided above the feed end 202 of the sieve plate 204, and the discharge pipe 23 is connected to the discharge port of the feeder through a pipeline, so that the raw materials are continuously transported to the sieve plate 204 through the discharge pipe 23. The discharge end 201 of the sieve plate 204 is connected to the feed port 101 to allow the screened material to enter the hopper 1. The sieve plate 204 is provided with a drop port 203, and the drop port baffle 3 is rotatably connected to the sieve plate 204 to open or close the drop port 203. Optionally, the sieve plate 204 is arranged at an angle to facilitate the movement of the material toward the feed port 101. It should be noted that, as shown Figure 3 As for the placement position of the feed port anti-blocking structure shown in the figure, the up and down directions in the figure are the upper and lower positions referred to.

[0051] like Figure 4As shown, the vibrator 205 is connected to the screen plate 204. For example, the vibrator 205 is installed to the bottom of the screen plate 204. The vibrator 205 is used to drive the screen plate 204 to vibrate, so as to screen out unqualified materials and move the materials on the screen plate 204 into the hopper 1. One end of the telescopic drive member 206 is connected to the screen plate 204, and the other end is connected to the blanking port baffle 3. The telescopic drive member 206 is used to drive the blanking port baffle 3 to rotate. Specifically, the telescopic drive member 206 can be an electric telescopic rod, an electric cylinder, a hydraulic cylinder, etc. Taking the electric telescopic rod as an example to illustrate this embodiment, the two ends of the electric telescopic rod are respectively hinged to the screen plate 204 and the blanking port baffle 3, so as to flexibly drive the opening and closing action of the blanking port baffle 3. It should be noted that, as shown in FIG. Figure 4 As for the placement position of the feed port anti-blocking structure shown in the figure, the up and down directions in the figure are the upper and lower positions, and the lower end of the sieve plate 204 in the figure is the bottom of the sieve plate 204.

[0052] With this arrangement, raw materials are conveyed onto the sieve plate 204, and the vibrator 205 is turned on, causing the sieve plate 204 to vibrate, screening out any unqualified materials mixed in. As the raw materials pass through the drop opening 203, the drop opening baffle 3 is rotated by controlling the telescopic drive member 206, thereby controlling the rapid opening and closing of the drop opening 203. This allows the portion of the raw materials containing unqualified materials to fall into the recovery device 4 for collection, preventing some hard objects from entering the hopper 1 and causing equipment failure.

[0053] In some embodiments of the present invention, the feed port anti-blocking structure further includes a visual detection module 5 and a controller. Specifically, Figure 3 As shown, the visual inspection module 5 is arranged above the screen plate 204 and is arranged corresponding to the blanking port 203. The visual inspection module 5 is used to detect unqualified materials and output a detection signal. The controller is electrically connected to the visual inspection module 5, and the controller is used to control the operation of the telescopic drive member 206 according to the detection signal sent by the visual inspection module 5. It should be noted that the visual inspection module 5 and the controller are both mature products in the relevant technology. For example, the visual inspection module 5 can use a CCD (Charge Coupled Device camera) visual inspection instrument, and the controller can use a single-chip microcomputer or an editable logic controller, etc. Therefore, the specific structure of the visual inspection module 5 and the controller and their related electrical connection relationship are no longer repeated here.

[0054] With this arrangement, a visual inspection module 5 is added above the blanking port 203 to detect whether the raw materials contain unqualified materials, and the telescopic drive member 206 is controlled according to the detection signal to realize the rapid opening and closing of the blanking port baffle 3, so that this part of the material can be effectively monitored, and efficient and automatic control can be achieved, thereby improving equipment reliability and work efficiency.

[0055] In some embodiments of the present invention, the screening device 2 further includes at least one partition 207, the number of which can be determined according to actual design requirements. Figure 3 As shown, each partition 207 is provided on the sieve plate 204 and is arranged corresponding to the material dropout opening 203. The partitions 207 are evenly spaced along the width of the sieve plate 204 to divide the material dropout opening 203 into at least two sub-dropout openings. The dropout opening baffle 3 and the telescopic drive member 206 are each provided in a one-to-one correspondence with the sub-dropout opening, that is, each sub-dropout opening can be opened or closed independently.

[0056] In this way, the partition 207 is used to divide the material into multiple channels, and the corresponding drop-out openings of the corresponding channels are opened to collect the material, thereby facilitating better screening of unqualified materials and improving screening efficiency and material transfer rate. Figure 3 As for the placement position of the feed port anti-blocking structure shown in the figure, the direction indicated by the arrow in the figure is the width direction of the screen plate 204.

[0057] In some embodiments of the present invention, the feed port anti-blocking structure further includes a fixing member 6 and at least one elastic support member 7, wherein the number of the elastic support members 7 can be specifically determined according to actual design requirements. Figure 3 As shown, the fixing member 6 is fixedly arranged below the sieve plate 204. Specifically, as Figure 1 As shown, a first fixing frame 19 is arranged on one side of the extruder body 18, and the first fixing frame 19 is used to support the fixing member 6. Figure 4 As shown, the fixing member 6 is provided with a through hole corresponding to the drop opening 203, so that unqualified materials fall into the recovery device 4 through the drop opening 203 and the through hole. Optionally, a guide pipe connected to the drop opening 203 is arranged at the bottom of the screen plate 204, and the guide pipe extends through the through hole to the bottom of the fixing member 6 to guide the material into the recovery device 4.

[0058] See also Figure 3 and Figure 4 , the elastic support members 7 can be springs, and the elastic support members 7 can be evenly arranged between the fixing member 6 and the sieve plate 204. The visual inspection module 5 is connected to the fixing member 6 through the connecting plate, and the discharge pipe 23 is connected to the fixing member 6 through the support frame 24. With this arrangement, the raw materials are continuously transported to the sieve plate 204 through the discharge pipe 23, and the vibrator 205 is turned on. The sieve plate 204 is vibrated through the cooperation of the elastic support members 7, driving the raw materials to pass through the partitions 207. When the visual inspection module 5 detects unqualified materials, the blanking plate 3 of the corresponding channel opens and closes quickly, allowing the part of the materials to fall into the recovery device 4 for collection, thereby avoiding hard objects getting stuck in the screw and causing equipment failure.

[0059] In some embodiments of the present invention, the feed port anti-blocking structure further includes a material level detection device 8 and an alarm device 9. Figure 3 and Figure 4 The material level detection device 8 is disposed on the recovery device 4 and is used to detect the material level in the recovery device 4. The material level detection device 8 is electrically connected to the controller. Specifically, the material level detection device 8 includes an infrared transmitter module 801 and an infrared receiver module 802. Of course, the material level detection device 8 includes but is not limited to the infrared detection device described above, and may also use a laser detection device.

[0060] The alarm device 9 is electrically connected to the controller, and the controller is also used to control the alarm device 9 to issue an alarm message when it detects that the material height is greater than or equal to the preset height. Optionally, the alarm device 9 can be a buzzer, a warning light, etc. This embodiment is described by taking the infrared detection module and the buzzer as an example. Figure 4 As shown, the infrared transmitting module 801 and the infrared receiving module 802 are relatively arranged on the top of the recovery device 4, and the buzzer can be connected to the fixing member 6 through the support frame 24. The infrared transmitting module 801 and the infrared receiving module 802 cooperate to monitor the height of the recovered material in the recovery device 4. When the accumulated material blocks the emitted infrared rays, the controller receives the signal sent by the infrared detection module and controls the buzzer to sound an alarm to prompt the staff to handle it in time to prevent the material from spilling outside the recovery device 4. It should be noted that the material level detection device 8, the alarm device 9 and the controller are all mature products in the relevant technology, so their specific structures and related electrical connection relationships are not repeated here.

[0061] In some embodiments of the present invention, Figure 3 As shown, the feed port anti-blocking structure also includes a connecting frame 10, which is connected to the fixing member 6. The connecting frame 10 is provided with a chute arranged along its length, and the recovery device 4 is slidably arranged in the chute. It should be noted that, as shown in FIG. Figure 3 As for the placement position of the feed port anti-blocking structure shown in the figure, the direction indicated by the arrow in the figure is the length direction of the connecting frame 10.

[0062] Specifically, if Figure 3 As shown, the recycling device 4 includes a recycling bin 401 and a pair of connecting frames 10. The connecting frames 10 are positioned opposite each other on either side of the recycling bin 401 and are connected to the bottom of the fixing member 6. Each of the connecting frames 10 is provided with a chute, and corresponding sliders 402 are provided on either side of the recycling bin 401. The sliders 402 slide into the chute. This arrangement allows for easy removal and reinstallation by workers, facilitating operation. Optionally, the recycling bin 401 is also provided with a handle 403 for easier extraction.

[0063] In some embodiments of the present invention, the feed port anti-blocking structure further includes a stirring shaft 11, a stirring drive member 13, and at least two stirring blades 12. Figure 2 As shown, the stirring shaft 11 is rotatably arranged in the hopper 1, and a plurality of stirring blades 12 are evenly distributed on the stirring shaft 11. The stirring drive member 13 is used to drive the stirring shaft 11 to rotate, and for example, an electric motor or a motor can be selected. Taking the motor as an example to illustrate this embodiment, the motor is connected to the stirring shaft 11 through a gear transmission mechanism to drive the stirring shaft 11 to rotate. A top cover 21 is provided on the top of the hopper 1, and the motor is mounted on the top cover 21. The gear transmission mechanism includes an active bevel gear and a driven bevel gear to change the transmission direction for easy arrangement. The output end of the motor is fixedly connected to the active bevel gear, and the driven bevel gear is engaged with one side of the active bevel gear. The bottom of the driven bevel gear is fixedly connected to the stirring shaft 11, and the stirring shaft 11 is rotatably connected to the top cover 21. A cover body 22 is also provided outside the gear transmission mechanism to play a protective role.

[0064] With this arrangement, the motor drives the stirring shaft 11 to rotate, which drives the stirring blade 12 to rotate, thereby stirring the material in the hopper 1 and accelerating the transportation of the material. Figure 2 As for the placement position of the feed port anti-blocking device shown in the figure, the up and down directions in the figure are the upper and lower positions referred to, the upper end in the figure is the top, and the lower end in the figure is the bottom.

[0065] In some embodiments of the present invention, the feed port anti-blocking structure further includes a cylinder 14, a feed pipe 16, and a spiral auger 17. Figure 2 As shown, a screw 15 is rotatably connected within barrel 14. A feed pipe 16 is connected to hopper 1 at one end and barrel 14 at the other. An auger 17 is rotatably mounted within feed pipe 16 and is connected to and rotates synchronously with agitator shaft 11. With this arrangement, when agitator shaft 11 rotates, auger 17 at its base also rotates, uniformly conveying material from hopper 1 into barrel 14 at the bottom of feed pipe 16. The pressure and shear force generated by the rotation of screw 15 fully plasticize and evenly mix the material before it passes through the die head for forming.

[0066] In summary, the embodiment of the present invention provides a feed inlet anti-blocking structure, which is equipped with a screening device 2, a recovery device 4, a visual detection module 5, a material level detection device 8, an alarm device 9, and a controller. Figures 1 to 4, connected to the discharge pipe 23 through an external pipe, and continuously conveying the material through the discharge pipe 23 to the screen plate 204. At this time, the vibrator 205 is turned on, and the screen plate 204 is vibrated through the cooperation of several elastic support members 7, driving the material to pass through the partition 207 and move toward the feed port 101. The visual inspection module 5 above the partition 207 is used to detect objects in the material that do not meet the material characteristics, and the corresponding electric telescopic rod is opened to control the rapid opening and closing of the channel's drop-out port, allowing this part of the material to enter the recovery box 401 through the guide pipe for collection, so that the material can be effectively monitored and some hard objects can be prevented from entering the interior of the hopper 1 and causing the screw 15 or the auger 17 to get stuck.

[0067] In this embodiment, infrared emitting module 801 and infrared receiving module 802 cooperate to monitor the level of recyclable materials within recycling bin 401. When materials block the emitted infrared rays, a buzzer sounds an alarm to alert staff, allowing them to promptly address the problem. Recycling bin 401 is slidably connected to connecting bracket 10 at the bottom of fixture 6 via slider 402, allowing staff to easily remove or reinstall recycling bin 401, making operation convenient.

[0068] According to an embodiment of the present invention, on the other hand, an extruder is also provided, comprising a feed port anti-blocking structure as in the above-mentioned embodiments. With such an arrangement, the raw material first passes through the screening device 2 before entering the feed port 101, and unqualified materials mixed therein are screened out. The drop-out port 203 is opened, and the unqualified materials fall into the recovery device 4, and the remaining materials are fed into the feed port 101, thereby screening and recovering the unqualified materials mixed in the raw material, preventing some hard objects in the raw material from entering the hopper and causing the screw to be stuck, thereby ensuring that the equipment works efficiently and reliably. The derivation process of this beneficial effect is roughly similar to the derivation process of the beneficial effect of the above-mentioned feed port anti-blocking structure, so it will not be repeated here.

[0069] In addition, it should be noted that the equipment structure and drawings of the present invention mainly describe the principles of the present invention. In terms of the technology of this design principle, the settings of the device's power mechanism, power supply system and control system are not fully described. On the premise that those skilled in the art understand the principles of the above-mentioned utility model, they can clearly know the specific settings of its power mechanism, power supply system and control system. The control method of the present invention is automatic control through a controller, and the control circuit of the controller can be implemented by simple programming by those skilled in the art.

[0070] The standard parts used can all be purchased from the market and can be customized according to the description in the instructions and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the relevant technology. The machinery, parts and equipment all adopt conventional models in the relevant technology, and the components known to those skilled in the art, their structures and principles are all known to those skilled in the art through technical manuals or through conventional experimental methods.

[0071] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A feed port anti-blocking structure, characterized in that: include: A hopper (1) is provided with a feed port (101); A screening device (2) is provided on one side of the hopper (1), a discharge end (201) of the screening device (2) is connected to the feed port (101), the screening device (2) is used to screen unqualified materials mixed in the raw materials and transport the screened raw materials into the hopper (1), and the screening device (2) is provided with a discharge port (203) for discharging the unqualified materials; A blanking port baffle (3) is sealed at the blanking port (203), and the blanking port baffle (3) is connected to the blanking port (203) in an openable and closable manner to open or close the blanking port (203); A recovery device (4) is provided corresponding to the material discharge port (203), and the recovery device (4) is used to recover the unqualified material discharged from the material discharge port (203).

2. The feed port anti-blocking structure according to claim 1, characterized in that: The screening device (2) comprises: A sieve plate (204), wherein the feed end (202) is connected to an external feeding mechanism, and the discharge end (201) is connected to the feed port (101), the sieve plate (204) is provided with the drop port (203), and the drop port baffle (3) is rotatably connected to the sieve plate (204) to open or close the drop port (203); a vibrator (205) connected to the sieve plate (204), the vibrator (205) being used to drive the sieve plate (204) to vibrate so as to screen out the unqualified materials; A telescopic driving member (206) is connected to the screen plate (204) at one end and to the blanking port baffle (3) at the other end, and the telescopic driving member (206) is used to drive the blanking port baffle (3) to rotate.

3. The feed port anti-blocking structure according to claim 2, characterized in that: Also includes: A visual inspection module (5) is arranged above the sieve plate (204) and corresponding to the blanking port (203), and the visual inspection module (5) is used to detect the unqualified material and output a detection signal; A controller is electrically connected to the visual detection module (5), and the controller is used to control the operation of the telescopic drive member (206) according to the detection signal.

4. The feed port anti-blocking structure according to claim 2, characterized in that: The screening device (2) further comprises: At least one partition (207) is arranged on the sieve plate (204) and corresponds to the blanking port (203). The partitions (207) are spaced apart along the width direction of the sieve plate (204) to divide the blanking port (203) into at least two sub-blanking ports. The blanking port baffle (3) and the telescopic drive member (206) are both arranged in one-to-one correspondence with the sub-blanking ports.

5. The feed port anti-blocking structure according to claim 2, characterized in that: Also includes: A fixing member (6) is fixedly arranged below the sieve plate (204), and the fixing member (6) is provided with a through hole corresponding to the drop opening (203) so that the unqualified material falls into the recovery device (4); At least one elastic support member (7) is disposed between the fixing member (6) and the sieve plate (204).

6. The feed port anti-blocking structure according to claim 3, characterized in that: Also includes: A material level detection device (8) is provided on the recovery device (4), the material level detection device (8) is used to detect the height of the material in the recovery device (4), and the material level detection device (8) is electrically connected to the controller; An alarm device (9) is electrically connected to the controller, and the controller is further configured to control the alarm device (9) to issue an alarm message when detecting that the material height is greater than or equal to a preset height.

7. The feed port anti-blocking structure according to claim 5, characterized in that: Also includes: A connecting frame (10) is connected to the fixing member (6), and the connecting frame (10) is provided with a slide groove arranged along its length direction, and the recovery device (4) is slidably arranged in the slide groove.

8. The feed port anti-blocking structure according to claim 1, characterized in that: Also includes: A stirring shaft (11) is rotatably disposed in the hopper (1); At least two stirring blades (12) are arranged on the stirring shaft (11); The stirring drive member (13) is used to drive the stirring shaft (11) to rotate.

9. The feed port anti-blocking structure according to claim 8, characterized in that: Also includes: A barrel (14), wherein a screw (15) is rotatably connected inside the barrel (14); a feed pipe (16), one end of which is connected to the hopper (1) and the other end of which is connected to the cylinder (14); A spiral auger (17) is rotatably arranged in the feed pipe (16), and the spiral auger (17) is connected to the stirring shaft (11) and rotates synchronously.

10. An extruder, characterized in that It comprises the feed port anti-blocking structure as described in any one of claims 1 to 9.

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