Duckbilled extrusion head

Abstract

The invention provides a duckbilled extrusion head, and relates to the technical field of extrusion equipment. The device comprises a mounting shell, a material extruding groove is formed in the mounting shell, a groove opening of the material extruding groove is detachably connected with the discharging port, a reducing section is formed in the material extruding groove, the large-diameter end of the reducing section communicates with the discharging port, and the large-diameter end of the reducing section communicates with the discharging port. A plurality of extrusion holes leading to the outside are formed in the groove wall of one side, close to the small-diameter end of the reducing section, of the extrusion groove. The discharging device has the advantage of being high in discharging efficiency.

Description

Technical Field

[0001] This application relates to the technical field of extrusion equipment, and particularly relates to a duckbill extrusion head. Background Art

[0002] Existing extrusion equipment generally includes a hopper, a material extrusion member, and an extrusion head. The inside of the hopper is used to contain the material to be extruded. An extrusion groove is formed along the length direction of the extrusion head. The notch of the extrusion groove is connected to the discharge port of the hopper. A plurality of extrusion holes leading to the outside are formed on the side wall of the extrusion groove far from the notch. The material extrusion member is arranged inside the hopper and can press the material in the hopper towards the extrusion groove so that the material is extruded from the extrusion holes of the extrusion head.

[0003] However, since the material extrusion member is generally set to press the same volume of material into the extrusion groove within a unit time, the extrusion pressure exerted by the material near the material extrusion member on the material in the extrusion groove is constant. Once a relatively large number of extrusion holes are formed on the side wall of the extrusion groove far from the notch, the extrusion pressure on the material strips in the extrusion holes farther from the material extrusion member will be reduced due to the influence of the extrusion holes closer to the material extrusion member around the extrusion hole, and then these material strips are prone to problems such as missing holes and fractures. As a result, only a relatively small number of extrusion holes can be formed on the extrusion head, and the discharging efficiency is very low.

[0004] In view of this, a duckbill extrusion head is needed. Summary of the Invention

[0005] In order to solve the problem that only a relatively small number of extrusion holes can be formed on the existing extrusion head and the discharging efficiency is very low, this application provides a duckbill extrusion head.

[0006] A duckbill extrusion head provided by this application adopts the following technical solution: it includes a mounting housing. An extrusion groove is formed on the mounting housing. The notch of the extrusion groove is detachably connected to the discharge port. A reduced-diameter section is formed inside the extrusion groove. The large-diameter end of the reduced-diameter section is communicated with the discharge port. A plurality of extrusion holes leading to the outside are formed on the side wall of the extrusion groove near the small-diameter end of the reduced-diameter section.

[0007] By adopting the above technical solution, the material in the hopper of the extrusion equipment will first enter the large-diameter end of the reduced-diameter section and move along the reduced-diameter section towards the small-diameter end of the reduced-diameter section after leaving the discharge port of the hopper. During this process, the material will be further compressed, so that the extrusion pressure on the material near the extrusion holes is stronger. As a result, more extrusion holes can be formed on the mounting housing, and the material strips extruded from these extrusion holes are all subjected to a relatively large extrusion pressure and are not prone to problems such as missing holes and fractures. Therefore, the extrusion equipment using this duckbill extrusion head has a relatively high discharging efficiency.

[0008] Specifically, the reducing section is sequentially formed with a reducing channel and an expanding channel along the direction approaching to and away from the discharge port, and the plurality of extrusion holes are formed into an extrusion hole group. The dimension of the reducing channel in the width direction of the extrusion hole group gradually decreases along the direction approaching to and away from the notch of the extrusion groove, and the dimension of the expanding channel in the length direction of the extrusion hole group gradually increases along the direction approaching to and away from the notch of the extrusion groove.

[0009] By adopting the above technical scheme, the setting of the reducing channel makes it possible for the size of the material in the width direction of the extrusion hole group to gradually decrease while the size in the length direction of the extrusion hole group remains unchanged when the material advances along the reducing channel; and the setting of the expanding channel makes it possible for the size of the material in the length direction of the extrusion hole group to gradually increase while the size in the width direction of the extrusion hole group remains unchanged when the material advances along the expanding channel, thereby enabling the cross-section of the material flow before entering the extrusion hole to be deformed into a quasi-rectangular shape similar to the extrusion hole group, so that each extrusion hole in the extrusion hole group can be allocated a sufficient amount of material.

[0010] Furthermore, the extrusion holes are sequentially formed with a shrinking section and a sizing section along the direction from close to far away from the notch of the extrusion groove, and the size of the shrinking section in the width direction of the extrusion hole group gradually decreases along the direction from close to far away from the notch of the extrusion groove.

[0011] By adopting the above technical solution, the setting of the shrinkage section not only allows more materials in the expansion channel to enter the extrusion holes, but also can further compress the materials entering the extrusion holes, so that the material strips extruded from these extrusion holes are less likely to have holes or breakage.

[0012] Furthermore, a scraping surface is formed on one side of the mounting shell away from the notch of the extrusion groove, and a port on one side of each sizing section close to the outside is opened on the scraping surface.

[0013] By adopting the above technical solution, the setting of the scraping surface can facilitate the user to use tools such as a spatula to quickly cut off the material strips extruded from all the extrusion holes along the scraping surface.

[0014] Furthermore, a discharge protrusion is provided on one side of the mounting shell away from the notch of the extrusion groove, and a first scraping surface and a second scraping surface are respectively formed on both sides of the discharge protrusion, and a plurality of extrusion holes are staggered on the first scraping surface and the second scraping surface along the length direction of the extrusion hole group, and the extrusion holes on the first scraping surface and the adjacent extrusion holes on the second scraping surface are staggered with each other in the vertical direction.

[0015] By adopting the above technical solution, since the material extrusion holes on the first scraping surface are vertically staggered from the material extrusion holes on the second scraping surface, the material strips extruded from the material extrusion holes on the first scraping surface are not likely to collide with the material strips extruded from the material extrusion holes on the second scraping surface.

[0016] Furthermore, it further includes a baffle plate, and the baffle plate is arranged below the discharge protrusion and connected to the installation housing.

[0017] By adopting the above technical solution, the baffle plate can block the lower part of the installation housing, so that the material strip is not likely to fall from the lower part of the installation housing.

[0018] Furthermore, it further includes a scraping assembly. The scraping assembly includes a transmission belt, a first scraper, a second scraper and a driving unit. The transmission belt is arranged on the installation housing along the length direction of the material extrusion group. The first scraping surface is located between the transmission belt and the second scraping surface. The first scraper and the second scraper are both arranged on the belt body of the transmission belt. The driving unit is in transmission connection with the transmission belt and can drive the transmission belt to rotate. When the transmission belt rotates, the first scraper can scrape across the entire first scraping surface along the length direction of the material extrusion group. And after the first scraper is separated from the first scraping surface, the second scraper can scrape across the entire second scraping surface along the length direction of the material extrusion group.

[0019] By adopting the above technical solution, when scraping is needed, the user can drive the transmission belt to rotate through the driving unit, so that the transmission belt can drive the first scraper to scrape across the entire first scraping surface first, and then drive the second scraper to scrape across the entire second scraping surface after the first scraper is separated from the first scraping surface, thereby being able to realize the scraping of the material strips on the first scraping surface and the second scraping surface.

[0020] Furthermore, the transmission belt includes a rotating belt, a driving wheel and a driven wheel. The driving wheel and the driven wheel are both rotatably connected to the installation housing, and the rotating belt is sleeved on the driving wheel and the driven wheel; The driving unit includes a one-way bearing, a driven gear, an installation cylinder and a telescopic rod. The one-way bearing is sleeved on the rotating shaft of the driving wheel, the driven gear is sleeved on the one-way bearing, the installation cylinder is arranged on the installation housing, and the mouth of the installation cylinder is located on the side of the installation cylinder close to the driven gear. One end of the telescopic rod is inserted into the installation cylinder and can slide along the direction from approaching to departing from the driven gear. A rack is arranged on the rod body of the telescopic rod along its own length direction, and the rack meshes with the driven gear.

[0021] By adopting the above technical solution, the user can drive the driven gear to rotate back and forth by pushing and pulling the telescopic rod. The setting of the one-way bearing enables the driven gear to drive the driving wheel, the conveyor belt and the driven wheel to rotate in the same direction when rotating in one direction through the one-way bearing with the inner and outer rings locked. When the driven gear rotates in the opposite direction, the outer ring of the one-way bearing will rotate on the inner ring and no longer transmit power to the driving wheel, the conveyor belt and the driven wheel, so that the conveyor belt can always rotate in one direction.

[0022] Further, the scraping component further includes a timing unit. The timing unit includes a partition plate, a driving piston, a driven piston, a flow baffle, an adjusting bolt and an elastic member. The partition plate is arranged in the installation cylinder and divides the interior of the installation cylinder into a near wheel cavity and a far wheel cavity. The driving piston is arranged in the near wheel cavity and abuts against the inner wall of the near wheel cavity. The driven piston is arranged in the far wheel cavity and abuts against the inner wall of the far wheel cavity. A communication hole for communicating the near wheel cavity and the far wheel cavity is formed on the partition plate. An air vent leading to the far wheel cavity is formed at one end of the installation cylinder away from the driven gear. A control liquid is filled in the cavity between the driving piston and the driven piston. The driving piston is connected to the telescopic rod. A receiving groove is formed on the pore wall of the communication hole. One end of the flow baffle is inserted into the receiving groove. An adjusting screw hole leading to the receiving groove is formed on the outer wall of the installation cylinder. The adjusting bolt is screwed with the adjusting screw hole, and the screw end of the adjusting bolt is rotatably connected to the flow baffle and can drive the flow baffle to approach or move away from the communication hole. When the flow baffle approaches the communication hole, the flow baffle can abut against the inner wall of the communication hole and cut off the communication hole. The elastic member is arranged between the driven piston and the inner wall of the far wheel cavity and can apply a force to the driven piston to approach the driven gear. When the driven piston approaches the driven gear, the inner ring and the outer ring of the one-way bearing are locked.

[0023] By adopting the above technical solution, when the user pushes the telescopic rod into the installation cylinder, the outer ring of the one-way bearing will rotate on the inner ring and will not drive the conveyor belt to rotate together. Instead, the telescopic rod will push the active piston away from the driven gear. At this time, the control liquid filled in the cavity between the active piston and the driven piston will pass through the communication hole and enter the far wheel cavity, causing the driven piston to move away from the driven gear and compress the elastic member. Then, after the user releases the telescopic rod, the elastic member will release its stored elastic potential energy and drive the driven piston, the control liquid, the active piston, and the telescopic rod to move towards the driven gear. At this time, the inner ring of the one-way bearing will lock with the outer ring and drive the conveyor belt to rotate one full circle, thereby causing the conveyor belt to drive the first scraper and the second scraper to scrape the material strips on the first scraping surface and the second scraping surface respectively. The user can tighten the adjusting bolt to drive the baffle closer to the communication hole and delay the time required for the control liquid to pass through the communication hole and enter the near wheel cavity under the drive of the elastic member, or loosen the adjusting bolt to drive the baffle away from the communication hole and shorten the time required for the control liquid to pass through the communication hole and enter the near wheel cavity under the drive of the elastic member, thereby controlling the duration of one full rotation of the conveyor belt. Since, without rotating the adjusting bolt, the time taken for the conveyor belt to complete one full rotation each time is also equal, the user only needs to ensure that the time intervals between multiple releases of the telescopic rod are consistent, so that the time intervals between the first scraper or the second scraper scraping a certain extrusion hole multiple times before and after are also consistent, thus ensuring that the lengths of the material strips scraped off from each extrusion hole are basically the same.

[0024] Further, a magnetic member is provided on the screw end of the adjusting bolt, and the adjusting bolt is magnetically connected to the baffle via the magnetic member.

[0025] By adopting the above technical solution, the setting of the magnetic member can achieve the rotational connection between the adjusting bolts.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. It includes an installation housing, an extrusion groove is formed on the installation housing, the notch of the extrusion groove is detachably connected to the discharge port, a reduced-diameter section is formed inside the extrusion groove, the large-diameter end of the reduced-diameter section is communicated with the discharge port, and a plurality of extrusion holes leading to the outside are formed on one side wall of the extrusion groove near the small-diameter end of the reduced-diameter section. So that the material in the hopper of the extrusion device will first enter the large-diameter end of the reduced-diameter section and advance along the reduced-diameter section towards the small-diameter end of the reduced-diameter section after leaving the discharge port of the hopper. During this process, the material will be further compressed, so that the extrusion pressure on the material near the extrusion holes is stronger, which not only enables more extrusion holes to be formed on the installation housing, but also makes the material strips extruded from these extrusion holes all receive a large extrusion pressure, and it is not easy to have situations such as missing holes and fractures. Therefore, the extrusion device using this duckbill-type extrusion head has a high discharge efficiency; 2. The scraping component further includes a timing control unit, which includes a partition plate, a driving piston, a driven piston, a baffle plate, an adjusting bolt and an elastic member. The partition plate is arranged inside the mounting cylinder and divides the interior of the mounting cylinder into a near wheel cavity and a far wheel cavity. The driving piston is arranged in the near wheel cavity and abuts against the inner wall of the near wheel cavity. The driven piston is arranged in the far wheel cavity and abuts against the inner wall of the far wheel cavity. A communication hole for communicating the near wheel cavity and the far wheel cavity is opened on the partition plate. A vent hole leading to the far wheel cavity is opened at one end of the mounting cylinder away from the driven gear. The cavity between the driving piston and the driven piston is filled with a control liquid. The driving piston is connected to the telescopic rod. A receiving groove is opened on the hole wall of the communication hole. One end of the baffle plate is inserted into the receiving groove. An adjusting screw hole leading to the receiving groove is opened on the outer wall of the mounting cylinder. The adjusting bolt is screwed with the adjusting screw hole, and the screw end of the adjusting bolt is rotatably connected to the baffle plate and can drive the baffle plate to approach or move away from the communication hole. When the baffle plate approaches the communication hole, the baffle plate can abut against the inner wall of the communication hole and block the communication hole. The elastic member is arranged between the driven piston and the inner wall of the far wheel cavity and can apply a force to the driven piston to approach the driven gear. When the driven piston approaches the driven gear, the inner ring and the outer ring of the one-way bearing are locked, so that when the user pushes the telescopic rod into the mounting cylinder, the outer ring of the one-way bearing will rotate on the inner ring and will not drive the conveyor belt to rotate together, and the telescopic rod will push the driving piston in the direction away from the driven gear. At this time, the control liquid filled in the cavity between the driving piston and the driven piston will pass through the communication hole and enter the far wheel cavity, and cause the driven piston to move in the direction away from the driven gear and compress the elastic member. Then, after the user releases the telescopic rod, the elastic member will release its own elastic potential energy and drive the driven piston, the control liquid, the driving piston and the telescopic rod to move in the direction close to the driven gear. At this time, the inner ring of the one-way bearing will be locked with the outer ring and drive the conveyor belt to rotate one full circle, and then the conveyor belt will drive the first scraper and the second scraper to scrape the material strips on the first scraping surface and the second scraping surface respectively; and the user can tighten the adjusting bolt to drive the baffle plate to approach the communication hole and delay the time required for the control liquid to pass through the communication hole and enter the near wheel cavity under the drive of the elastic member, or loosen the adjusting bolt to drive the baffle plate to move away from the communication hole and shorten the time required for the control liquid to pass through the communication hole and enter the near wheel cavity under the drive of the elastic member, thereby controlling the time consumed for the conveyor belt to rotate one full circle. And since without adjusting the bolt, the time consumed for the conveyor belt to rotate one full circle each time is also equal, so that the user only needs to ensure that the time intervals between multiple releases of the telescopic rod are consistent, then the time intervals between the first scraper or the second scraper scraping a certain extrusion hole multiple times before and after can also be consistent, thereby ensuring that the lengths of the material strips scraped off from each extrusion hole are basically the same. Description of the Drawings

[0027] Figure 1 is a perspective view of a duckbill extrusion head of the present application; Figure 2 is the front view of a duckbill extrusion head of the present application; Figure 3 is a schematic cross-sectional view taken along the Figure 2 A-A direction in; Figure 4 is a schematic cross-sectional view taken along the Figure 3 B-B direction in; Figure 5 is a schematic cross-sectional view taken along the Figure 2 C-C direction in.

[0028] Reference numerals: 1, mounting housing; 11, reduced diameter section; 111, reduced diameter channel; 112, enlarged diameter channel; 12, material extrusion hole; 121, material reduction section; 122, sizing section; 13, first scraping surface; 14, second scraping surface; 15, connection hole; 2, baffle; 3, scraping assembly; 31, transmission belt; 311, turning belt; 312, driving wheel; 313, driven wheel; 32, first scraper; 33, second scraper; 34, driving unit; 341, one-way bearing; 342, driven gear; 343, mounting cylinder; 3431, ventilation hole; 3432, abutting projection; 344, telescopic rod; 35, timing control unit; 351, partition; 352, active piston; 353, driven piston; 354, flow baffle; 355, adjusting bolt; 3551, magnetic part; 356, elastic part; 4, control liquid. Detailed implementation manners

[0029] The following is further described in conjunction with the attached drawings 1-5: Referring to Figure 1 and Figure 2 , a duckbill extrusion head is installed on the discharge port of a hopper (not shown in the figure) of an extrusion device such as a twin-screw extruder. The duckbill extrusion head specifically includes a mounting housing 1, a baffle 2 and a scraping assembly 3. A material extrusion groove is formed on one side of the mounting housing 1 along its width direction. An outlet projection is provided on the other side of the mounting housing 1. A first scraping surface 13 and a second scraping surface 14 are respectively formed on both sides of the outlet projection. 40 material extrusion holes 12 are staggered along the length direction of the mounting housing 1 on the first scraping surface 13 and the second scraping surface 14, so that the material strips extruded from the material extrusion holes 12 on the first scraping surface 13 are not likely to collide with the material strips extruded from the material extrusion holes 12 on the second scraping surface 14; these material extrusion holes 12 are formed into an approximately rectangular extrusion hole group; a plurality of connection holes 15 are further formed on the mounting housing 1, so that the duckbill extrusion head can be screwed to the extrusion device through the connection holes 15 by bolts to detachably connect the notch of the material extrusion groove to the discharge port; the baffle 2 is screwed below the outlet projection, so as to be able to block the lower part of the mounting housing 1 through the baffle 2, so that the material strips are not likely to fall from the lower part of the mounting housing 1.

[0030] See Figure 3 and Figure 5 , a reduced-diameter section 11 is formed inside the material extrusion groove. The reduced-diameter section 11 is successively formed with a reduced-diameter channel 111 and an expanded-diameter channel 112 along the direction from near to far from the discharge port. The expanded-diameter channel 112 is directly communicated with the material extrusion hole 12. The dimension of the reduced-diameter channel 111 in the width direction of the extrusion hole group gradually decreases along the direction from near to far from the notch of the material extrusion groove. The dimension of the expanded-diameter channel 112 in the length direction of the extrusion hole group gradually increases along the direction from near to far from the notch of the material extrusion groove, and an approximately duckbill structure is formed; and in each of the material extrusion holes 12, a material-reducing section 121 and a sizing section 122 are successively formed along the direction from near to far from the notch of the material extrusion groove. The dimension of the material-reducing section 121 in the width direction of the extrusion hole group gradually decreases along the direction from near to far from the notch of the material extrusion groove. The hole diameter of the sizing section 122 located in the middle of the extrusion hole group can be 3.5 cm, and the hole diameter of the sizing section 122 located at the edge of the extrusion hole group can be 3.7 cm.

[0031] See Figure 1 and Figure 4 , the scraping component 3 includes a transmission belt 31, a first scraper 32, a second scraper 33, a driving unit 34 and a timing control unit 35. The transmission belt 31 is arranged on the top of the installation shell 1 along the length direction of the material extrusion group. The first scraping surface 13 is located between the transmission belt 31 and the second scraping surface 14. The transmission belt 31 includes a rotating belt 311, a driving wheel 312 and a driven wheel 313. Both the driving wheel 312 and the driven wheel 313 are rotatably connected to the installation shell 1. The rotating belt 311 is sleeved on the driving wheel 312 and the driven wheel 313; the driving unit 34 includes a one-way bearing 341, a driven gear 342, an installation cylinder 343 and a telescopic rod 344. The one-way bearing 341 is sleeved on the rotating shaft of the driving wheel 312. The driven gear 342 is sleeved on the one-way bearing 341. The installation cylinder 343 is arranged on the installation shell 1, and the cylinder opening of the installation cylinder 343 is located on the side of the installation cylinder 343 close to the driven gear 342. One end of the telescopic rod 344 is inserted into the installation cylinder 343 and can slide along the direction from near to far from the driven gear 342. A rack is arranged on the rod body of the telescopic rod 344 along its own length direction, and the rack meshes with the driven gear 342; when the telescopic rod 344 extends out of the installation cylinder 343, the inner ring and the outer ring of the one-way bearing 341 are locked.

[0032] See Figure 1 and Figure 4, the timing control unit 35 includes a partition plate 351, a driving piston 352, a driven piston 353, a baffle plate 354, an adjusting bolt 355 and an elastic member 356. The partition plate 351 is disposed in the mounting cylinder 343 and divides the interior of the mounting cylinder 343 into a near-wheel cavity and a far-wheel cavity. The driving piston 352 is disposed in the near-wheel cavity and abuts against the inner wall of the near-wheel cavity. The driven piston 353 is disposed in the far-wheel cavity and abuts against the inner wall of the far-wheel cavity. A communication hole for communicating the near-wheel cavity and the far-wheel cavity is formed on the partition plate 351. An air vent hole 3431 leading to the far-wheel cavity is formed at one end of the mounting cylinder 343 away from the driven gear 342. A control liquid 4 is filled in the cavity between the driving piston 352 and the driven piston 353. The driving piston 352 is connected to the telescopic rod 344. A receiving groove is formed on the pore wall of the communication hole. One end of the baffle plate 354 is inserted into the receiving groove. An adjusting screw hole leading to the receiving groove is formed on the outer wall of the mounting cylinder 343. The adjusting bolt 355 is screwed with the adjusting screw hole, and the screw end of the adjusting bolt 355 is rotatably connected to the baffle plate 354 and can drive the baffle plate 354 to approach or move away from the communication hole. When the baffle plate 354 approaches the communication hole, the baffle plate 354 can abut against the inner wall of the communication hole and block the communication hole. The elastic member 356 is disposed between the driven piston 353 and the inner wall of the far-wheel cavity. The elastic member 356 can be a compression spring, so as to be able to apply a force to the driven piston 353 to approach the driven gear 342 through the compression spring; an abutting protrusion 3432 is further formed on the inner wall of the far-wheel cavity, and the driven piston 353 can abut against the side of the abutting protrusion 3432 close to the driven gear 342.

[0033] Specifically, the middle part of the handle of the second scraper 33 can be an arc protruding away from the mounting housing 1, so that when the driving belt 31 rotates to drive the first scraper 32 to scrape across the entire first scraping surface 13 first and then the second scraper 33 rotates to a position in contact with the second scraping surface 14, the newly emerging material strips on the first scraping surface 13 will not come into contact with the middle part of the handle of the second scraper 33, thereby ensuring that the second scraper 33 scrapes across the entire second scraping surface 14 and the newly emerging material strips on the first scraping surface 13 will not be knocked off by the second scraper 33; the control liquid 4 can be a transmission liquid such as water or a non-Newtonian fluid with shear thickening characteristics. Since this non-Newtonian fluid has the property that the greater the external force it receives, the more viscous it is and the less likely it is to pass through the communication hole, during the process that the compression spring gradually extends and the elastic force applied to the driven piston 353 also decreases from large to small, the flow rate of the control liquid 4 in the communication hole can always maintain a relatively stable flow rate, and then during the process that the entire telescopic rod 344 extends out of the mounting cylinder 343, the rotation speed of the rotating belt 311 will not change significantly.

[0034] The implementation principle of the scraping assembly 3 described in this application is as follows: When the user pushes the telescopic rod 344 into the installation cylinder 343 until the driven piston 353 abuts against the abutting protrusion 3432, the outer ring of the one-way bearing 341 will rotate on the inner ring and will not drive the conveyor belt 311 to rotate together. Instead, the telescopic rod 344 will push the driving piston 352 away from the driven gear 342. At this time, the control liquid 4 filled in the cavity between the driving piston 352 and the driven piston 353 will pass through the communication hole and enter the far wheel cavity, causing the driven piston 353 to move away from the driven gear 342 and compress the elastic member 356. Then, after the user releases the telescopic rod 344, the elastic member 356 will release its stored elastic potential energy and drive the driven piston 353, the control liquid 4, the driving piston 352, and the telescopic rod 344 to move towards the driven gear 342. At this time, the inner ring of the one-way bearing 341 will be locked with the outer ring and drive the conveyor belt 311 to rotate one full circle, thereby causing the conveyor belt 311 to drive the first scraper 32 and the second scraper 33 to scrape the material strips on the first scraping surface 13 and the second scraping surface 14 respectively; and the user can tighten the adjusting bolt 355 to drive the baffle 354 closer to the communication hole and delay the time required for the control liquid 4 to pass through the communication hole and enter the near wheel cavity under the drive of the elastic member 356, or loosen the adjusting bolt 355 to drive the baffle 354 away from the communication hole and shorten the time required for the control liquid 4 to pass through the communication hole and enter the near wheel cavity under the drive of the elastic member 356, thereby controlling the time consumed for the conveyor belt 311 to rotate one full circle. Since, without adjusting the adjusting bolt 355, the time consumed for the conveyor belt 311 to rotate one full circle each time is also equal, the user only needs to ensure that the time intervals between multiple releases of the telescopic rod 344 are consistent, so that the time intervals between multiple scrapings of a certain material extrusion hole 12 by the first scraper 32 or the second scraper 33 are also consistent, thereby ensuring that the lengths of the material strips scraped from each material extrusion hole 12 are basically the same.

[0035] The implementation principle of the duckbill extrusion head described in this application is as follows: Since the material in the hopper of the extrusion device will first enter the reduced-diameter channel 111 after leaving the discharge port of the hopper, and the setting of the reduced-diameter channel 111 causes the size of the material in the width direction of the extrusion hole group to gradually decrease while the size in the length direction of the extrusion hole group remains unchanged when the material advances along the reduced-diameter channel 111; and the setting of the enlarged-diameter channel 112 causes the size of the material in the length direction of the extrusion hole group to gradually increase while the size in the width direction of the extrusion hole group remains unchanged when the material advances along the enlarged-diameter channel 112, thereby enabling the cross-section of the material flow before entering the extrusion holes 12 to be deformed into a similar rectangular shape to the extrusion hole group, so that each extrusion hole 12 in the extrusion hole group can be allocated sufficient material, and thus the material will be further compressed during this process, so that the extrusion pressure on the material near the extrusion holes 12 is stronger, thereby enabling more extrusion holes 12 to be opened on the mounting housing 1; the setting of the material-reducing section 121 not only enables more material in the enlarged-diameter channels 112 to enter the extrusion holes 12, but also can further compress the material entering the extrusion holes 12, so that the extruded strips from these extrusion holes 12 are not prone to problems such as missing holes and fractures, thereby enabling the extrusion device using this duckbill extrusion head to have a high discharge efficiency.

[0036] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. 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 duckbill extrusion head is installed on the discharge port of the hopper of an extrusion device, and is characterized in that: It includes an installation housing (1). An extrusion groove is formed on the installation housing (1). The notch of the extrusion groove is detachably connected to the discharge port. A reduced-diameter section (11) is formed inside the extrusion groove. The large-diameter end of the reduced-diameter section (11) is communicated with the discharge port. A plurality of extrusion holes (12) leading to the outside are formed on one side wall of the extrusion groove near the small-diameter end of the reduced-diameter section (11).

2. The duckbill extrusion head according to claim 1, characterized in that: The reduced-diameter section (11) is sequentially formed with a reduced-diameter channel (111) and an enlarged-diameter channel (112) in the direction from near to far away from the discharge port. The plurality of extrusion holes (12) form an extrusion hole group. The size of the reduced-diameter channel (111) in the width direction of the extrusion hole group gradually decreases in the direction from near to far away from the notch of the extrusion groove. The size of the enlarged-diameter channel (112) in the length direction of the extrusion hole group gradually increases in the direction from near to far away from the notch of the extrusion groove.

3. The duckbill extrusion head according to claim 1, characterized in that: The extrusion hole (12) is sequentially formed with a material-reducing section (121) and a sizing section (122) in the direction from near to far away from the notch of the extrusion groove. The size of the material-reducing section (121) in the width direction of the extrusion hole group gradually decreases in the direction from near to far away from the notch of the extrusion groove.

4. The duckbill extrusion head according to claim 3, characterized in that: A scraping surface is formed on one side of the installation housing (1) away from the notch of the extrusion groove. One side port near the outside of each sizing section (122) is opened on the scraping surface.

5. The duckbill extrusion head according to claim 4, characterized in that: An outlet protrusion is provided on one side of the installation housing (1) away from the notch of the extrusion groove. A first scraping surface (13) and a second scraping surface (14) are respectively formed on both sides of the outlet protrusion. The plurality of extrusion holes (12) are staggered along the length direction of the extrusion hole group on the first scraping surface (13) and the second scraping surface (14). And the extrusion holes (12) on the first scraping surface (13) and the adjacent extrusion holes (12) on the second scraping surface (14) are staggered with each other in the vertical direction.

6. The duckbill extrusion head according to claim 5, characterized in that: It further includes a baffle (2). The baffle (2) is arranged below the outlet protrusion and connected to the installation housing (1).

7. The duckbill extrusion head according to claim 5, characterized in that: It further includes a scraping assembly (3). The scraping assembly (3) includes a transmission belt (31), a first scraper (32), a second scraper (33) and a driving unit (34). The transmission belt (31) is arranged on the installation housing (1) along the length direction of the extrusion group. The first scraping surface (13) is located between the transmission belt (31) and the second scraping surface (14). The first scraper (32) and the second scraper (33) are both arranged on the belt body of the transmission belt (31). The driving unit (34) is in transmission connection with the transmission belt (31) and can drive the transmission belt (31) to rotate. When the transmission belt (31) rotates, the first scraper (32) can scrape across the entire first scraping surface (13) along the length direction of the extrusion hole group. And after the first scraper (32) is separated from the first scraping surface (13), the second scraper (33) can scrape across the entire second scraping surface (14) along the length direction of the extrusion hole group.

8. The duckbill extrusion head according to claim 7, characterized in that: The conveyor belt (31) includes a rotating belt (311), a driving wheel (312), and a driven wheel (313). The driving wheel (312) and the driven wheel (313) are both rotatably connected to the mounting housing (1), and the rotating belt (311) is sleeved on the driving wheel (312) and the driven wheel (313). The driving unit (34) includes a one-way bearing (341), a driven gear (342), a mounting cylinder (343), and a telescopic rod (344). The one-way bearing (341) is sleeved on the rotating shaft of the driving wheel (312), the driven gear (342) is sleeved on the one-way bearing (341), the mounting cylinder (343) is arranged on the mounting housing (1), and the mouth of the mounting cylinder (343) is located on the side of the mounting cylinder (343) close to the driven gear (342). One end of the telescopic rod (344) is inserted into the mounting cylinder (343) and can slide in the direction from close to the driven gear (342) to far from the driven gear (342). A rack is arranged on the rod body of the telescopic rod (344) along its own length direction, and the rack meshes with the driven gear (342).

9. The duckbill extrusion head according to claim 8, characterized in that: The scraping component (3) further includes a timing control unit (35). The timing control unit (35) includes a partition plate (351), a driving piston (352), a driven piston (353), a baffle plate (354), an adjusting bolt (355), and an elastic member (356). The partition plate (351) is arranged in the mounting cylinder (343) and divides the interior of the mounting cylinder (343) into a near-wheel cavity and a far-wheel cavity. The driving piston (352) is arranged in the near-wheel cavity and abuts against the inner wall of the near-wheel cavity. The driven piston (353) is arranged in the far-wheel cavity and abuts against the inner wall of the far-wheel cavity. A communication hole for communicating the near-wheel cavity and the far-wheel cavity is formed in the partition plate (351). An air vent hole (3431) leading to the far-wheel cavity is formed in one end of the mounting cylinder (343) far from the driven gear (342). A control liquid (4) is filled in the cavity between the driving piston (352) and the driven piston (353). The driving piston (352) is connected to the telescopic rod (344). A receiving groove is formed in the hole wall of the communication hole. One end of the baffle plate (354) is inserted into the receiving groove. An adjusting screw hole leading to the receiving groove is formed in the outer wall of the mounting cylinder (343). The adjusting bolt (355) is screwed with the adjusting screw hole, and the screw end of the adjusting bolt (355) is rotatably connected to the baffle plate (354) and can drive the baffle plate (354) to approach or depart from the communication hole. When the baffle plate (354) approaches the communication hole, the baffle plate (354) can abut against the inner wall of the communication hole and block the communication hole. The elastic member (356) is arranged between the driven piston (353) and the inner wall of the far-wheel cavity and can apply a force to the driven piston (353) to approach the driven gear (342). When the driven piston (353) approaches the driven gear (342), the inner ring and the outer ring of the one-way bearing (341) are jammed.

10. A duckbill extrusion head according to claim 9, characterized in that: A magnetic member (3551) is provided at the screw end of the adjusting bolt (355), and the adjusting bolt (355) is magnetically connected to the baffle plate (354) via the magnetic member (3551).

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