A bamboo pulp paper preparation crushing, slicing and cutting device

Abstract

A kind of bamboo pulp paper preparation is broken and is cut into pieces with slicing device, including breaking mechanism, division and cutting mechanism, feeding mechanism, slicing mechanism.Breaking mechanism includes pressing plate and first support table arranged below pressing plate, and the bottom surface of pressing plate is arrayed with accommodating groove, and first support table is arrayed with through groove;Division and cutting mechanism includes multiple cutting knives arranged on cutter body support, and cutting knife is respectively corresponding with through groove one by one, and cutter body support is below first support table and is respectively connected with first lifting cylinder at both ends, and first lifting cylinder is arranged on the first linear mechanism on the side of first support table;Slicing mechanism includes second support table and slicing assembly, and second support table is spaced apart with multiple knife grooves parallel to the width direction of second support table, and each knife groove corresponds a slicing assembly;Feeding mechanism is arranged on first support table.This device integrates breaking, division and cutting into one, and breaking and division are completed in the same station, improve the final slicing effect, save labor, improve work efficiency.

Description

Technical Field

[0001] This invention relates to bamboo pulp paper preparation technology, and more particularly to a crushing, slicing and cutting device for bamboo pulp paper preparation. Background Technology

[0002] The preparation of bamboo pulp paper involves several processes, including bamboo acquisition, branch removal, bamboo crushing, bamboo slicing, natural fermentation, multiple sieving, cooking, re-sieving, and high-temperature sterilization. Currently, crushing and slicing are separate processes that require manual transfer between each other, resulting in wasted time. Although some devices combine the two processes, the quality of the slices after slicing is not ideal, which limits the effectiveness of subsequent natural fermentation and consequently affects the overall efficiency and the quality of the finished bamboo pulp paper. Summary of the Invention

[0003] To address the shortcomings of the aforementioned existing technologies, this invention provides a crushing, slicing, and cutting device for bamboo pulp paper preparation, which integrates crushing, slicing, and cutting into one unit, with crushing and slicing completed at the same workstation, thereby improving the final slice cutting effect, saving labor, and increasing work efficiency.

[0004] In order to achieve the objective of this invention, the following solution is proposed: A crushing, slicing, and cutting device for bamboo pulp paper preparation includes: The crushing mechanism includes a pressure plate located at the movable end of a pair of downward pressing cylinders and a first support platform located below the pressure plate. The bottom surface of the pressure plate is provided with multiple receiving grooves that run through the front and rear ends of the pressure plate along the length direction. The first support platform is provided with multiple through grooves that correspond one-to-one with the receiving grooves. The through grooves run through the top and bottom surfaces of the first support platform. A lifting mechanism and a limiting plate connected to the lifting mechanism are provided above the front end of the first support platform. The limiting plate is used to limit the bamboo pieces to be crushed and shredded to the bottom of the pressure plate under the action of the lifting mechanism. The slitting mechanism includes multiple cutting blades arrayed on the blade support, each cutting blade corresponding to a through slot. The blade support is located below the first support platform and the two ends of the blade support are respectively connected to a first lifting cylinder. The first lifting cylinder is located on the first linear mechanism on both sides of the first support platform. The slicing mechanism includes a second support platform connected to the front end of the first support platform and a slicing assembly disposed above the second support platform. The second support platform is provided with a plurality of blade grooves parallel to the width direction of the second support platform, and each blade groove corresponds to a slicing assembly. The feeding mechanism, located on the first support platform, is used to push the bamboo pieces that have been crushed and slicing on the first support platform to the slicing mechanism.

[0005] Furthermore, a pair of limiting side plates are provided on the first support platform, and a through groove is located in the area between the limiting side plates. There is a pair of feeding mechanisms, symmetrically arranged on the first support platform. The feeding mechanism includes a second linear mechanism located on the side of the first support platform and a T-shaped slide plate connected to the movable end of the second linear mechanism. The second linear mechanism is located above the first linear mechanism. The vertical part of the T-shaped slide plate is located between the limiting side plate and the second linear mechanism. The horizontal part of the T-shaped slide plate contacts and cooperates with the top surface of the limiting side plate and the top surface of the housing of the second linear mechanism. A rotating seat is provided on the top of the T-shaped slide plate, and a rotating rod is passed through the rotating seat. One end of the rotating rod is vertically connected to the feeding plate, and the other end of the rotating rod is provided with a worm gear. A rotating plate motor is fixed on the top of the T-shaped slide plate through a motor support. A worm gear that cooperates with the worm gear is provided above the worm gear. One end of the worm gear is connected to the output shaft of the rotating plate motor, and the other end is rotatably cooperated with the rotating rod seat. The rotating rod seat is located on the top of the T-shaped slide plate.

[0006] Furthermore, one of the feeding mechanisms has a mating part on the outer end of its feeding plate, and the other feeding mechanism has a mating groove on the outer end of its feeding plate. The mating groove runs through the top and bottom surfaces of the feeding plate. The thickness of the mating part is less than the thickness of the feeding plate and matches the width of the mating groove. When the feeding plate rotates to the point where its bottom surface contacts the top surface of the first support platform, the mating part engages with the mating groove.

[0007] Furthermore, the front end of the pressure plate is provided with a vertical through groove, the limiting plate slides vertically in the vertical through groove, the lifting mechanism includes a pair of second lifting cylinders, the movable end of the second lifting cylinders is connected to the same connecting plate, the connecting plate is fixed to the front surface of the limiting plate, and the second lifting cylinders are fixed to the first upper frame through the vertical plate.

[0008] Furthermore, the bottom projection of the limiting plate is located within the coverage area of ​​the through groove, and the plane containing the front surface of the limiting plate and the plane containing the front end face of the through groove have a predetermined distance.

[0009] Furthermore, the slicing assembly includes a slicing blade body arranged parallel to the blade groove, a lifting plate connected to the slicing blade body, a pair of second guide rods connected to the lifting plate, and a lifting rod. The lifting rod is vertically slidably fitted onto a vertical guide frame. The upper end of the lifting rod is rotatably connected to one end of a first rotating rod via a rotating shaft. The other end of the first rotating rod is rotatably connected to one end of a second rotating rod via a rotating shaft. The other end of the second rotating rod is connected to the output shaft of a rotating motor. The rotating motor and the vertical guide frame are fixed to a horizontal frame plate. The second guide rod is set through the horizontal frame plate, and the horizontal frame plate is connected to a second upper frame.

[0010] Furthermore, the pressing cylinder is fixed to the bottom surface of the first upper frame, and the pressure plate is provided with multiple first guide rods, which pass through the first upper frame.

[0011] Furthermore, a pair of limiting baffles are provided on the top surface of the second support platform, and the knife groove is located in the area between the limiting baffles.

[0012] The beneficial effects of this invention are as follows: 1. It integrates crushing, splitting, and slicing into one unit, with crushing and splitting completed at the same workstation, improving the final slicing effect, saving labor, and increasing work efficiency; 2. The position of the crushed bamboo is determined by the limiting plate, and space is provided for the cutting blade to rise. At the same time, the receiving groove and the through groove provide space for the cutting blade to rise and travel, so as to separate the crushed bamboo pieces that are still under pressure and obtain finer bamboo pieces. After further slicing, even finer slices can be obtained, which is conducive to natural fermentation. 3. By setting up a feeding mechanism, the feeding plate closes when needed and can move along the limiting side plate to push the bamboo onto the slicing mechanism, thereby realizing automatic material transfer. 4. Through multiple slicing components, a reciprocating forming mechanism consisting of a motor, a first rotating rod, a second rotating rod, and a lifting rod is used for the slicing blade to achieve slicing with good results. As the feeding mechanism pushes the bamboo, it is continuously sliced ​​during the conveying process, improving the slicing effect. Attached Figure Description

[0013] The accompanying drawings described herein are merely illustrative of selected embodiments, not all possible implementations, and are not intended to limit the scope of this application.

[0014] Figure 1 This is a three-dimensional schematic diagram of the overall structure of an embodiment of this application. Figure 1 .

[0015] Figure 2 This is a three-dimensional schematic diagram of the overall structure of an embodiment of this application. Figure 2 .

[0016] Figure 3 This is a side view of the overall structure of an embodiment of this application.

[0017] Figure 4 for Figure 1 Enlarged view of section A in the image.

[0018] Figure 5 for Figure 1 Enlarged view of section B in the image.

[0019] Figure 6 This is a schematic diagram of the slitting mechanism structure according to an embodiment of this application.

[0020] Figure 7 This is a schematic diagram of the feeding mechanism structure according to an embodiment of this application.

[0021] Figure 8 This is a schematic diagram of the limiting plate and lifting mechanism in an embodiment of this application.

[0022] Figure 9This is a three-dimensional schematic diagram of the slicing mechanism structure according to an embodiment of this application. Figure 1 .

[0023] Figure 10 This is a three-dimensional schematic diagram of the slicing mechanism structure according to an embodiment of this application. Figure 2 . Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the implementation methods of the present invention will be described in detail below with reference to the accompanying drawings. However, the embodiments described in this invention are only some embodiments of the present invention, and not all embodiments.

[0025] This application provides a crushing, slicing, and cutting device for bamboo pulp paper preparation, such as... Figures 1-10 As shown, it includes: crushing mechanism 1, slicing mechanism 2, splitting mechanism 3, feeding mechanism 4, etc. Specifically, in the example shown in the figure, the crushing mechanism 1 includes a pressure plate 13 located at the movable end of a pair of pressing cylinders 12 and a first support platform 10 located below the pressure plate 13. The bottom surface of the pressure plate 13 has an array of multiple receiving grooves 131 extending along its length from the front to the rear end of the pressure plate 13. The first support platform 10 has an array of multiple through grooves 101 corresponding to the receiving grooves 131, which extend through the top and bottom surfaces of the first support platform 10. A lifting mechanism and a limiting plate 14 connected to the lifting mechanism are located above the front end of the first support platform 10. The limiting plate 14 is used to confine the bamboo pieces to be crushed and shredded below the pressure plate 13 under the action of the lifting mechanism. A pair of limiting side plates 102 are provided on the first support platform 10, and the through grooves 101 are located in the area between the limiting side plates 102. The pressing cylinders 12 are fixed to the bottom surface of the first upper frame 11. The pressure plate 13 has multiple first guide rods 15, which pass through the first upper frame 11.

[0026] The pressure plate 13 has a vertical through groove 132 at its front end. The limiting plate 14 slides vertically in the vertical through groove 132. The lifting mechanism includes a pair of second lifting cylinders 141. The movable ends of the second lifting cylinders 141 are connected to the same connecting plate 142. The connecting plate 142 is fixed to the front surface of the limiting plate 14. The second lifting cylinders 141 are fixed to the first upper frame 11 by a vertical plate. The bottom projection of the limiting plate 14 is located within the coverage area of ​​the through groove 101. The plane of the front surface of the limiting plate 14 and the plane of the front end surface of the through groove 101 have a predetermined distance.

[0027] Specifically, in this example, the splitting mechanism 3 includes a plurality of cutting blades 31 arrayed on the blade support 30. Each cutting blade 31 corresponds to a through slot 101. The blade support 30 is located below the first support platform 10 and is connected to a first lifting cylinder 32 at both ends. The first lifting cylinder 32 is located on the first linear mechanism 33 on both sides of the first support platform 10.

[0028] Specifically, in this example, the slicing mechanism 2 includes a second support platform 20 connected to the front end of the first support platform 10 and a slicing assembly 22 disposed above the second support platform 20. The second support platform 20 is provided with a plurality of knife grooves 201 parallel to the width direction of the second support platform 20, and each knife groove 201 corresponds to a slicing assembly 22. The top surface of the second support platform 20 is provided with a pair of limiting baffles 21, and the knife grooves 201 are located in the area between the limiting baffles 21. The slicing assembly 22 includes a slicing blade body 221 arranged parallel to the blade groove 201, a lifting plate 222 connected to the slicing blade body 221, a pair of second guide rods 231 connected to the lifting plate 222, and a lifting rod 223. The lifting rod 223 is vertically slidably fitted on the vertical guide frame 224. The upper end of the lifting rod 223 is rotatably connected to one end of a first rotating rod 226 via a rotating shaft. The other end of the first rotating rod 226 is rotatably connected to one end of a second rotating rod 227 via a rotating shaft. The other end of the second rotating rod 227 is connected to the output shaft of the rotating motor 228. The rotating motor 228 and the vertical guide frame 224 are fixed to the horizontal frame plate 229. The second guide rods 231 are arranged through the horizontal frame plate 229. The horizontal frame plate 229 is connected to the second upper frame 24.

[0029] Specifically, in this example, the feeding mechanism 4 is located on the first support platform 10 and is used to push the bamboo pieces that have been crushed and spun on the first support platform 10 to the slicing mechanism 2. There is a pair of feeding mechanisms 4, symmetrically arranged on the first support platform 10. The feeding mechanism 4 includes a second linear mechanism 41 located on the side of the first support platform 10 and a T-shaped slide plate 42 connected to the movable end of the second linear mechanism 41. The second linear mechanism 41 is located above the first linear mechanism 33. The vertical part of the T-shaped slide plate 42 is located between the limiting side plate 102 and the second linear mechanism 41. The horizontal part of the T-shaped slide plate 42 contacts and cooperates with the top surface of the limiting side plate 102 and the top surface of the housing of the second linear mechanism 41. The top of the T-shaped slide plate 42 is provided with a rotating seat 44. A rotating rod 43 passes through the rotating seat 44. One end of the rotating rod 43 is vertically connected to the feeding plate 40. The other end of the rotating rod 43 is provided with a worm gear 431. The top of the T-shaped slide plate 42 is fixed with a rotating plate motor 46 through a motor support. Above the worm gear 431 is a worm 45 that cooperates with the worm gear 431. One end of the worm 45 is connected to the output shaft of the rotating plate motor 46, and the other end is rotatably cooperated with a rotating rod seat. The rotating rod seat is located on the top of the T-shaped slide plate 42. One of the feeding mechanisms 4 has a feeding plate 40 with a mating part at its outer end, and the other feeding mechanism 4 has a feeding plate 40 with a mating groove 401 at its outer end. The mating groove 401 passes through the top and bottom surfaces of the feeding plate 40. The thickness of the mating part is less than the thickness of the feeding plate 40 and matches the width of the mating groove 401. When the feeding plate 40 rotates to the point where its bottom surface contacts the top surface of the first support platform 10, the mating part engages with the mating groove 401.

[0030] Both the first linear mechanism 33 and the second linear mechanism 41 adopt linear screw motor assemblies.

[0031] The first guide rod 15 is used to constrain the lifting and lowering of the pressure plate 13, and the second guide rod 231 is used to constrain the lifting and lowering of the lifting plate 222, thereby improving the stability of the device operation.

[0032] The following is based on Figures 1-10 This example details the working method applied to processing bamboo / bamboo parts: First, material is fed from the rear end of the first support platform 10 to the crushing mechanism 1. Specifically, the rotating plate motor 46 rotates, driving the worm gear 45 to rotate, which in turn drives the worm wheel 431 to rotate, causing the rotating rod 43 to rotate and the feeding plate 40 to rotate until the feeding plate 40 rises vertically, opening the rear end of the first support platform 10. At the same time, the second lifting cylinder 141 lowers the limiting plate 14 along the vertical through groove 132 until it contacts the top surface of the first support platform 10, and then the bamboo to be processed is fed in. The bamboo fed in is bamboo with branches removed, and the length of the bamboo is less than the distance between the limiting plate 14 and the feeding plate 40.

[0033] Then, the front end of the bamboo is conveyed to contact the limiting plate 14 and is limited by the limiting plate 14; then the pressing plate 13 is driven by the pressing cylinder 12 to press down and crush the bamboo into sheet-like strips.

[0034] Then, while maintaining the downward pressure of the crushing mechanism 1, the second lifting cylinder 141 is used to retract the limiting plate 14 to a certain height. Then, the first linear mechanism 33 moves the first lifting cylinder 33 and the blade support 30 to one end of the through groove 101, so that the front end of the cutting blade 31 is aligned with the front wall of the through groove 101. The cutting blade 31 is able to move upward and pass through the through groove 101. Due to the position setting of the limiting plate 14, there is a certain distance between the front end of the bamboo and the front wall of the through groove 101. This distance is just enough for the cutting blade 31 to pass through and also facilitates the cutting blade 31 to cut the bamboo from the front end. After the blade support 30 is moved into place, the first lifting cylinder 33 raises the blade support 30 and the cutting blade 31, causing the upper part of the cutting blade 31 to extend from the front end of the bamboo and the front wall of the through groove 101 onto the surface of the first support platform 10. Since the bottom surface of the pressure plate 13 also has a corresponding receiving groove 131, it provides space for the cutting blade 31 to rise and move. The upper part of the extended cutting blade 31 is located in the receiving groove 131, and the rising height is kept from contacting the bottom surface of the receiving groove 131. Then, the first linear mechanism is used to... 33, driving the first lifting cylinder 33, the blade support 30, and the cutting blade 31 together to move towards the rear end of the first support platform 10. The range of movement does not exceed the length of the through groove 101. When it moves to the rear end of the through groove 101, the cutting blade 31 further splits the bamboo that has been crushed into pieces into finer, longer pieces, completing the splitting. Then, the first lifting cylinder 33 lowers the blade support 30 and the cutting blade 31, and the first linear mechanism 33 resets them, waiting for the next splitting.

[0035] Then, the crushing mechanism 1 rises, and the rotating plate motor 46 rotates, driving the worm gear 45 to rotate, which in turn drives the worm wheel 431 to rotate. This causes the rotating rod 43 to rotate, causing the feeding plate 40 to rotate. As the feeding plate 40 rotates downward, the mating part gradually engages with the mating groove 401, providing space for the rotation of the feeding plate 40 and preventing interference between the rotation of the feeding plates 40 on both sides. This also allows the feeding plates 40 on both sides to form a closed loop after they are rotated into position. After being rotated into position, the second linear mechanism 41 drives the T-shaped slide plate 42 and the feeding plate 40 to move together along the limiting side plate 102, pushing the crushed and shredded bamboo onto the second support platform 20. Then, the feeding mechanism 4 returns to its original position, and the rotating plate motor 46 controls the feeding plate 40 to rise, so that the rear end of the first support platform 10 is reopened, ready for the next feeding.

[0036] Then, the bamboo on the second support platform 20 awaits slicing by the slicing mechanism 2. Specifically, the rotating motor 228 rotates the second rotating rod 227, which in turn drives one end of the first rotating rod 226 to rotate. The other end of the first rotating rod 226 drives the lifting rod 223 to move up and down within the vertical guide frame 224. When the lifting rod 223 reaches its lowest point, the slicing blade 221, connected via the lifting plate 222, plunges into the blade groove 201, slicing the bamboo. This rotation enables reciprocating motion, allowing for continuous slicing. The multiple slicing components 22, which can be set to rotate synchronously, improve the slicing effect. After slicing, bamboo slices are obtained and can be used in the next process.

[0037] The above are merely preferred embodiments of the present invention and are not intended to be the only or limiting of the present invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from its scope are all within the protection scope of the present invention.

Claims

1. A crushing, slicing, and cutting device for bamboo pulp paper preparation, characterized in that, include: The crushing mechanism (1) includes a pressure plate (13) located at the movable end of a pair of downward pressure cylinders (12) and a first support platform (10) located below the pressure plate (13). The bottom surface of the pressure plate (13) is provided with multiple receiving grooves (131) extending along the length direction through the front and rear ends of the pressure plate (13). The first support platform (10) is provided with multiple through grooves (101) corresponding to the receiving grooves (131) respectively. The through grooves (101) penetrate the top and bottom surfaces of the first support platform (10). 13) Used to crush and break bamboo into sheet-like strips. The front end of the first support platform (10) is provided with a lifting mechanism and a limiting plate (14) connected to the lifting mechanism. The limiting plate (14) is used to limit the bamboo pieces to be crushed and shredded under the action of the lifting mechanism below the pressure plate (13). The bottom projection of the limiting plate (14) is located within the coverage area of ​​the through groove (101). The plane of the front surface of the limiting plate (14) and the plane of the front end of the through groove (101) have a predetermined distance. The splitting mechanism (3) includes multiple cutting blades (31) arrayed on the blade support (30). The cutting blades (31) correspond one-to-one with the through slots (101). The blade support (30) is located below the first support platform (10), and the two ends of the blade support (30) are respectively connected to the first lifting cylinders (32). The first lifting cylinders (32) are located on the first linear mechanism (33) on both sides of the first support platform (10). The slicing mechanism (2) includes a second support platform (20) connected to the front end of the first support platform (10) and a slicing assembly (22) disposed above the second support platform (20). The second support platform (20) is provided with multiple knife grooves (201) parallel to the width direction of the second support platform (20), and each knife groove (201) corresponds to a slicing assembly (22). The feeding mechanism (4) is located on the first support platform (10) and is used to push the bamboo pieces that have been crushed and split on the first support platform (10) to the slicing mechanism (2). A pair of limiting side plates (102) are provided on the first support platform (10). A through groove (101) is located in the area between the limiting side plates (102). There is a pair of feeding mechanisms (4), which are symmetrically arranged on the first support platform (10). The feeding mechanism (4) includes a second linear mechanism (41) located on the side of the first support platform (10) and a T-shaped slide plate (42) connected to the movable end of the second linear mechanism (41). The second linear mechanism (41) is located above the first linear mechanism (33). The vertical part of the T-shaped slide plate (42) is located between the limiting side plate (102) and the second linear mechanism (41). The horizontal part of the T-shaped slide plate (42) is in contact with the limiting side plate (102). The top surface of the side plate (102) and the top surface of the housing of the second linear mechanism (41) are provided with a rotating seat (44) on the top of the T-shaped slide plate (42). A rotating rod (43) is passed through the rotating seat (44). One end of the rotating rod (43) is vertically connected to the feeding plate (40). The other end of the rotating rod (43) is provided with a worm gear (431). A rotating plate motor (46) is fixed on the top of the T-shaped slide plate (42) through a motor support. A worm (45) that cooperates with the worm gear (431) is provided above the worm gear (431). One end of the worm gear (45) is connected to the output shaft of the rotating plate motor (46), and the other end is rotatably engaged with the rotating rod seat. The rotating rod seat is located on the top of the T-shaped slide plate (42).

2. The crushing, slicing, and cutting device for bamboo pulp paper preparation according to claim 1, characterized in that, One of the feeding mechanisms (4) has a feeding plate (40) with a mating part at the outer end, and the other feeding mechanism (4) has a feeding plate (40) with a mating groove (401) at the outer end. The mating groove (401) penetrates the top and bottom surfaces of the feeding plate (40). The thickness of the mating part is less than the thickness of the feeding plate (40) and matches the width of the mating groove (401). When the feeding plate (40) rotates to the point where the bottom surface contacts the top surface of the first support platform (10), the mating part is mated in the mating groove (401).

3. The crushing, slicing, and cutting device for bamboo pulp paper preparation according to claim 1, characterized in that, The front end of the pressure plate (13) is provided with a vertical through groove (132), and the limiting plate (14) slides vertically in the vertical through groove (132). The lifting mechanism includes a pair of second lifting cylinders (141). The movable end of the second lifting cylinder (141) is connected to the same connecting plate (142). The connecting plate (142) is fixed to the front surface of the limiting plate (14), and the second lifting cylinder (141) is fixed to the first upper frame (11) by a vertical plate.

4. The crushing, slicing, and cutting device for bamboo pulp paper preparation according to claim 1, characterized in that, The slicing assembly (22) includes a slicing blade body (221) arranged parallel to the blade groove (201), a lifting plate (222) connected to the slicing blade body (221), a pair of second guide rods (231) connected to the lifting plate (222), and a lifting rod (223). The lifting rod (223) is vertically slidably fitted on the vertical guide frame (224). The upper end of the lifting rod (223) is rotatably connected to one end of a first rotating rod (226) via a rotating shaft. The other end of the first rotating rod (226) is rotatably connected to one end of a second rotating rod (227) via a rotating shaft. The other end of the second rotating rod (227) is connected to the output shaft of a rotating motor (228). The rotating motor (228) and the vertical guide frame (224) are fixed to a horizontal frame plate (229). The second guide rod (231) is set through the horizontal frame plate (229). The horizontal frame plate (229) is connected to the second upper frame (24).

5. The crushing, slicing, and cutting device for bamboo pulp paper preparation according to claim 3, characterized in that, The pressure cylinder (12) is fixed to the bottom surface of the first upper frame (11), and multiple first guide rods (15) are provided on the pressure plate (13). The first guide rods (15) pass through the first upper frame (11).

6. The crushing, slicing, and cutting device for bamboo pulp paper preparation according to claim 1, characterized in that, The top surface of the second support platform (20) is provided with a pair of limiting baffles (21), and the knife groove (201) is located in the area between the limiting baffles (21).

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