Rice falling plate with one end of rice grain cut off on outer side of rice passing hole and separated from rice grain on inner side of rice passing hole and brown rice processing machine comprising rice falling plate

Abstract

The invention discloses a rice falling plate with one end of rice grains cut off on the outer side of a rice passing hole and separated from the rice grains on the inner side of the rice passing hole and a brown rice processing machine comprising the rice falling plate, relates to the field of germ-remaining rice processing, and aims at solving the problems that cutter grooves of an existing rice falling plate are prone to breakage and poor in screening effect. The rice passing holes communicated with the rice containing groove are formed in the left side wall or / and the right side wall of the plate body in the length direction of the rice containing groove, the rice dividing holes are formed in the outer sides of the rice passing holes, and the diameter of the cross section of each rice passing hole is larger than the maximum diameter of the cross section of brown rice grains. Rice grains are pushed by power to move, penetrate through the rice passing hole and then are limited by a baffle mounted on the plate body, the cutter is arranged at the edge of the outer side of the rice passing hole and is used for cutting off the rice grains, and a separation hole is downwards formed in the bottom of the rice passing hole; and any distance from the central point of the hole cross section of the decimeter hole and the separation hole to the hole edge is greater than one half of the maximum side length or one half of the diagonal length of the brown rice grain falling section entity. The method is used for processing the germ-remaining rice.

Description

Technical Field

[0001] The invention relates to the field of embryo-retained rice processing, in particular to a rice dropping plate with one end of a rice grain cut off outside a rice hole and separated from the rice grain inside the rice hole, and a brown rice processing machine comprising the rice dropping plate. Background Art

[0002] As people pay more and more attention to healthy eating, the requirements for the integrity and nutritional value of rice with germ are getting higher and higher. In order to ensure the integrity of the germ and improve the concentration of the germ content in the product, the existing technologies have successively adopted the following methods to achieve this: (1) "cutting the middle of the brown rice grains", such as the patent with publication number CN117000327A, entitled "A device for locking rice grains against one end in the rice trough and a rice cutting system containing the device"; (2) "cutting two grains at the same time", such as the invention patent with authorization announcement number CN114030023B, entitled "A device for clamping brown rice grains in the middle position of the rice trough"; (3) "cutting two grains at different times", such as the invention patent with publication number CN118287179A, entitled "A method for cutting the two tips of brown rice and separating them from the middle section by negative pressure suction".

[0003] In the above patent, during the rice cutting process, at least one cutting groove is opened in the rice loading groove on the rice dropping plate, and the cutter 7 is inserted into the cutting groove. The rice dropping plate with this structure needs to reserve a groove bottom plate with a thickness of 0.4-1mm at the bottom of the cutting groove. The reason is: if the rice groove of the rice dropping plate is deep, two grains of brown rice can be placed in the rice loading groove in the vertical direction, which will make it impossible to cut two grains of brown rice at the same time. This is determined by the natural growth of brown rice. If the requirement of only loading one grain of rice and cutting the brown rice is achieved, the bottom plate of the cutting groove will be the thinnest part of the rice dropping plate, which will lead to the problem that the rice dropping plate is easily broken at the knife groove after long-term use.

[0004] Furthermore, because the length of rice kernels within the same batch varies by approximately 2 mm, the thickness of rice grains within the same batch still varies, which can also lead to adverse consequences. Existing rice cutting methods involve cutting within cutting grooves on a rice-dropping plate. The cutting grooves are located within the rice-dropping trough, and the distance between the two cutting grooves is fixed. Given the inconsistent lengths of the rice kernels, the two rice tips of the cut rice grains will also differ in size. As a result, during the rice separation process, some rice tips will become stuck in the rice-dropping holes, preventing them from being screened or even being crushed, resulting in a screening pass rate of only approximately 80% for the rice tips. Extensive and long-term testing has also revealed that within the same batch of unpolished rice, not only the length but also the thickness can vary. Consequently, the length of the rice tips inserted into the vent holes in the rice trough can also vary, resulting in unequal lengths of the cut tips. Consequently, the integrity of the cut tips within the rice grains, including the germ, can also fall short of the required level. Consequently, existing rice-dropping plates suffer from a problem where the screening pass rate for the rice tips fails to meet the required level.

[0005] In summary, the existing rice dropping plate has the problems of easy breakage at the cutting groove and the embryo integrity rate of the tip section after cutting and screening does not meet the requirements. Summary of the Invention

[0006] The present invention aims to address the problems of existing rice dropping plates, such as the tendency for the cutting blade groove to break and the insufficient germ integrity rate at the tip of the rice after cutting. The present invention moves the location where the cutting blade cuts the brown rice outside the rice dropping groove. Furthermore, a rice dropping plate is provided, in which one end of the rice grain is cut outside the rice passage hole, separating it from the rice grains inside the rice passage hole, and a brown rice processing machine incorporating the same.

[0007] The technical solution of the present invention is: A rice dropping plate is provided for cutting off one end of rice grains outside a rice passage hole and separating the rice grains from the rice grains inside the rice passage hole. The plate body comprises a plate body provided with a plurality of rice loading grooves and a baffle. A rice loading groove is provided on the left or right side wall of the plate body along the length direction of the rice loading grooves, respectively, and is connected to the rice loading grooves. The rice loading grooves are blind holes open at the top. A decimeter hole is provided outside the rice loading hole and passes through the thickness direction of the plate body. The rice loading hole is a cylindrical hole with a cross-sectional diameter larger than the maximum diameter of the cross-sectional diameter of the brown rice grains. After the rice grains are moved by power and pass through the rice loading hole, they are limited by the baffle installed on the plate body. A cutter is provided at the outer edge of the rice loading hole for cutting off the rice grains. A separation hole is provided downwardly at the bottom of the rice loading hole.

[0008] Furthermore, a downwardly concave arc bottom surface is processed on the bottom of the rice trough and transitions to a rice hole.

[0009] Furthermore, the distance between the inner side wall of the baffle and the outer side surface of the rice hole is one third to one half of the length of the brown rice.

[0010] Furthermore, any distance from the center point of the cross section of the decimeter hole and the separation hole to the hole edge is greater than half of the maximum side length or half of the diagonal length of the brown rice grain falling section entity.

[0011] The present invention also provides a rice-dropping plate which cuts off one end of a rice grain outside a rice hole and separates the rice grain from the rice grain inside the rice hole. The plate comprises a plate body provided with a plurality of rice troughs, and a baffle. Rice holes communicating with the rice troughs are respectively provided on the left and right side walls of the plate body along the length direction of the rice troughs. The rice troughs are blind holes open at the top, and decimeter holes are provided on the outside of the rice holes and through the thickness direction of the plate body. The rice holes are cylindrical holes and the diameter of their cross sections is larger than the maximum diameter of the cross section of the brown rice grains. The rice grains move successively under the push of power and pass through the rice holes and are limited by the baffle installed on the plate body. A cutter is provided at the outer edge of the rice hole for cutting off the rice grains, and a separation hole is provided downwardly at the bottom of the rice hole.

[0012] Furthermore, the distance between the inner side wall of the baffle and the outer side surface of the rice hole is the length of the tip of the cut brown rice grain including the complete embryo.

[0013] Furthermore, an annular recess is provided on the inner side wall of the baffle at a position opposite to the center of the rice hole.

[0014] Furthermore, any distance from the center point of the cross section of the decimeter hole and the separation hole to the hole edge is greater than half of the maximum side length or half of the diagonal length of the brown rice grain falling section entity.

[0015] The present invention also provides a brown rice processing machine using a rice dropping plate that cuts off one end of the rice grains outside the rice hole and separates them from the rice grains inside the rice hole. The brown rice processing machine includes a plate body and an integrated pressure cover. The integrated pressure cover is installed on the plate body, and a baffle is respectively provided at the inner ring and the outer ring of the upper surface of the plate body. An annular groove is processed in the middle of the outer surface of each baffle, and a ventilation steel mesh is embedded in the interior of the annular groove. An annular pit is provided on the inner side wall of the ventilation steel mesh at a position relative to the center of the rice hole on the plate body. Two blade mounting holes are evenly processed along the circumferential direction on the lower surface of the integrated pressure cover. The two blade mounting holes are symmetrically staggered relative to the center line of the rice loading hole on the plate body. A cutter is provided inside each blade mounting hole. An air duct is respectively processed on the outer surface and the inner surface of the integrated pressure cover, and the two air ducts of the integrated pressure cover are staggered. The two air ducts are both connected to the interior of the rice loading hole on the plate body.

[0016] Furthermore, a blade mounting hole is provided between the end of one air channel and the beginning of another air channel on the integrated gland, and another blade mounting hole is provided between the beginning of one air channel and the end of another air channel on the integrated gland.

[0017] Compared with the prior art, the present invention has the following effects: 1. The present invention eliminates the cutting groove, solving the problem of the rice falling plate being easily broken at the cutting groove, which is specifically embodied in: The method of cutting one end of the rice in the rice trough is changed to cutting two tips or one tip or about 2 / 5 of the whole rice grains outside the rice trough. The advantage is that the knife groove in the rice trough is eliminated, so that the rice drop plate has no weakest point, thereby ensuring the natural service life of the rice drop plate.

[0018] 2. The present invention can achieve equal length of cut brown rice ends, ensuring the integrity of the embryo, which is specifically embodied in: The present invention provides a baffle on the plate body, which mainly serves to limit the length of the brown rice extending out of the rice hole, so that the lengths of the cut brown rice are equal and the lengths of the cut rice tips are also equal. At the same time, the present invention can also ensure that the cut rice tips have complete embryos by limiting the extending length of the brown rice.

[0019] 3. The present invention can effectively separate the cut rice, which is specifically embodied in: The present invention provides a rice-dropping plate with a rice-dropping hole and a separation hole, and the upper edge of the rice-dropping hole is lower than the rice-loading trough and the rice-passing hole, so that the tips of the rice cut off grain by grain directly drop through the rice-dropping hole, and the cut-off part and the remaining part of the rice are respectively located outside and inside the rice-passing hole and are not mixed with each other, so that they are easier to be screened and separated.

[0020] 4. The present invention can ensure that the cut tip segment has a complete embryo.

[0021] Because the length of the rice grain extending out of the rice hole can be designed artificially, that is, the length of the rice grain extending out of the rice hole can be ensured to be equal regardless of whether it is thick or thin, the embryo contained in the cut tip segment is complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the rice falling plate of the present invention; Figure 2 This is the main cross-sectional view of the integrated component and the rice drop plate in the connected state. This situation is suitable for "one cut" because in the actual production process, the left or right side of the rice trough is selected for cutting according to needs, or only one side of the rice hole is processed during production. Among them, part 7 represents the cutter, and the arrow indicates the direction of rice falling; Figure 3 It is a side sectional view of the integrated component and the rice drop plate in the connected state; Figure 4 It is a structural diagram when the separation hole 5 is opened on the outside of the rice trough 2. This situation is suitable for "cutting twice". Figure 5 It is a schematic diagram of the overall structure after the integration part 10 and the rice falling plate are matched.

[0023] In the figure: 1, plate body, 1-1 arc-shaped bottom surface, 2, rice trough, 3, rice hole, 4, rice separation hole, 5, separation hole, 6, baffle, 6-1, annular pit, 7, cutter, 10, integrated part, 11, ventilation steel mesh. DETAILED DESCRIPTION

[0024] Specific implementation method 1: Combination Figures 1 to 3 The present embodiment is described. The present embodiment includes a plate body 1, on which a plurality of rice loading troughs 2 are provided. The plate body 1 also includes a baffle 6. A rice hole 3 communicating with the rice loading trough 2 is provided on the left or right side wall of the plate body 1 along the length direction of the rice loading trough 2. The rice loading trough 2 is a blind hole open at the top. A decimeter hole 4 is provided on the outside of the rice hole 3 and passes through the thickness direction of the plate body 1. The rice hole 3 is a cylindrical hole and the diameter of its cross section is larger than the maximum diameter of the cross section of the brown rice grain. After the rice grain moves under the push of power and passes through the rice hole 3, it is limited by the baffle 6 installed on the plate body 1. The cutter 7 is provided at the outer edge of the rice hole 3 for cutting off the rice grain. A separation hole 5 is provided downward at the bottom of the rice hole 3.

[0025] The rice falling plate of this embodiment is suitable for the "one-cut" method in the embryo rice processing machine. At this time, as long as any end of the brown rice is extended out of the rice hole 3, the rice can be cut outside the rice hole 3.

[0026] In this embodiment, the sizes of the rice separation hole 4 and the separation hole 5 are limited to ensure that the cut rice grains can fall smoothly, achieving effective rice separation without jamming.

[0027] The cutter 7 in this embodiment can be set in the rice cutting area of ​​the entire plate body 1. It can be fixed. Or when two cuts are required, the cutter 7 can be driven by the cylinder to float up and down to achieve the rice cutting according to actual needs.

[0028] Specific implementation method 2: Combination Figures 2 to 3 This embodiment describes the rice trough 2. The bottom of the rice trough 2 is machined with a downwardly concave curved bottom surface 1-1, which transitions to the rice hole 3. This arrangement creates a smooth transition between the curved bottom surface 1-2 and the rice hole 3, allowing the brown rice grains to quickly slide into the rice hole 3. The remaining components and connections are the same as those in the first embodiment.

[0029] Specific implementation method three: Combination Figures 2 to 3 To illustrate this embodiment, the distance between the inner side wall of the baffle 6 and the outer side surface of the rice hole 3 is one third to one half of the length of the brown rice.

[0030] In this arrangement, the distance between the inner sidewall of the baffle 6 and the outer side of the rice hole 3 is used to limit the length of the rice grains to be cut. When the middle part needs to be cut, the distance is one-third to one-half of the length of the brown rice. The other components and connection relationships are the same as those of the first or second embodiment.

[0031] Specific implementation method four: Combination Figures 2 to 3 The present embodiment is described, and any distance from the center point of the hole cross section of the decimeter hole 4 and the separation hole 5 of the present embodiment to the hole edge is greater than half of the maximum side length or half of the diagonal length of the brown rice falling section entity. This arrangement is convenient for separating the rice section after cutting off.

[0032] Specific implementation method five: Combination Figures 2 to 3 The present embodiment is described. The present embodiment includes a plate body 1, on which a plurality of rice loading troughs 2 are provided, and a baffle 6 is provided. A rice hole 3 communicating with the rice loading trough 2 is respectively provided on the left and right side walls of the plate body 1 along the length direction of the rice loading trough 2. The rice loading trough 2 is a blind hole open at the top. A decimeter hole 4 is provided on the outside of the rice hole 3 and extends through the thickness direction of the plate body 1. The rice hole 3 is a cylindrical hole with a cross-sectional diameter greater than the maximum diameter of the cross-section of the brown rice grain. The rice grain moves successively under the impetus of power and passes through the rice hole 3 and is limited by the baffle 6 installed on the plate body 1. A cutter 7 is provided at the outer edge of the rice hole 3 for cutting off the rice grain. A separation hole 5 is provided downwardly at the bottom of the rice hole 3. Any distance from the center point of the hole cross section of the decimeter hole 4 and the separation hole 5 to the hole edge is greater than half of the maximum side length or half of the diagonal length of the brown rice grain falling section entity.

[0033] This arrangement is suitable for "cutting both ends in a time-sharing manner." Therefore, rice holes 3 are provided on both the left and right sides of the rice trough 2 in the longitudinal direction. Furthermore, the rice grains are moved in sequence under the power of the power source, thereby ensuring time-sharing rice cutting, uniform length of the cut rice grains, and smooth rice separation. The other components and connections are the same as those of any one of the first to fourth embodiments.

[0034] Specific implementation method six: combination Figures 2 to 3 The present embodiment is described in that the distance between the inner side wall of the baffle 6 and the outer side surface of the rice hole 3 is the length of the tip section of the cut brown rice grain including the complete embryo.

[0035] In this way, by limiting the distance between the inner side wall of the baffle 6 and the outer side of the rice hole 3, the rice can be cut into equal lengths without damaging the embryo of the brown rice. The other components and connection relationships are the same as any one of the specific embodiments 1 to 5.

[0036] Specific implementation method seven: combination Figures 1 to 3To illustrate this embodiment, an annular recess 6 - 1 is provided on the inner side wall of the baffle 6 at a position opposite to the center of the rice hole 3 .

[0037] Thus, the annular recess 6-1 acts as a limiter for the extended brown rice, ensuring that after the extended brown rice end is inserted into the annular recess 6-1, the cut rice grains are of equal length. This solves the problem of rice sticking caused by the uneven lengths of the cut rice tips. Each tip segment is cut and screened, increasing the screening pass rate to over 98%. The other components and connections are the same as those of any one of the first to sixth embodiments.

[0038] Specific implementation method eight: combination Figures 1 to 3 The present embodiment is described, and any distance from the center point of the hole cross section of the decimeter hole 4 and the separation hole 5 of the present embodiment to the hole edge is greater than half of the maximum side length or half of the diagonal length of the brown rice falling section entity. This arrangement is convenient for separating the rice section after cutting off.

[0039] Specific implementation method nine: combination Figures 1 to 5 The present embodiment is described. The brown rice processing machine of the present embodiment comprises a plate body 1 and an integrated gland 10. The integrated gland 10 is mounted on the plate body 1, and a baffle 6 is respectively provided at the inner ring and the outer ring of the upper surface of the plate body 1. An annular groove is processed in the middle portion of the outer surface of each baffle 6, and a ventilation steel mesh 11 is embedded in the interior of the annular groove. An annular pit 6-1 is provided on the inner side wall of the ventilation steel mesh 11 at a position relative to the center of the rice hole 3 on the plate body 1. The lower surface of the integrated gland 10 is evenly processed with two blade mounting holes along the circumferential direction. The two blade mounting holes are symmetrically staggered relative to the center line of the rice loading hole 2 on the plate body 1. A cutter 7 is provided inside each blade mounting hole. An air duct is respectively processed on the outer surface and the inner surface of the integrated gland 10, and the two air ducts of the integrated gland 10 are staggered, and the two air ducts are both connected to the inside of the rice loading hole 2 on the plate body 1.

[0040] Specific implementation method ten: Combination Figures 1 to 5 To illustrate this embodiment, a blade mounting hole is provided between the end of one air channel and the beginning of another air channel on the integrated pressure cover 10, and another blade mounting hole is provided between the beginning of one air channel and the end of another air channel on the integrated pressure cover 10.

[0041] This arrangement facilitates the air source power that pushes the rice grains to move horizontally to directly pass through the through hole 11 and act on the rice grains. The other components and connection relationships are the same as any one of the specific embodiments 1 to 8.

[0042] Combine Figures 1 to 5 The working principle of the present invention is described: When the structure of the plate body 1 is that a rice hole 3 connected to the rice trough 2 is respectively opened on the left or right side along the length direction of the rice trough 2, one end of the brown rice is moved toward and outside the rice hole 3 by a fan on one of the air channels on the integrated pressure cover 10, so that the rice grains are cut into two parts along the middle of the rice grains by the cutter 7, and the two parts are separated by the rice separation hole 4 and the separation hole 5, which is suitable for "cutting with one knife".

[0043] When the structure of the plate body 1 is that rice holes 3 connected to the rice loading trough 2 are respectively opened on the left and right sides along the length direction of the rice loading trough 2, one end of the brown rice is moved toward the outside of the rice hole 3 by the fan on one of the air channels on the integrated pressure cover 10 so that the tip of the rice is cut off by the cutter 7 and separated from the rice segment in the rice hole 3 at the decimeter hole 4. Then, the other end of the brown rice is moved toward the outside of the other rice hole 3 by the fan on the other air channel on the integrated pressure cover 10 so that the tip of the rice is cut off by the cutter 7 and separated at the other decimeter hole 4. The middle segment of the rice grains left is separated at the separation hole 5, which is suitable for "cutting in two ways".

Claims

1. A rice dropping plate in which one end of a rice grain is cut off outside a rice hole and separated from the rice grain inside the rice hole, comprising a plate body (1) with a plurality of rice loading grooves (2) provided on the plate body (1), characterized in that: The invention further comprises a baffle (6), a rice hole (3) connected to the rice loading trough (2) is respectively provided on the left or right side wall of the plate body (1) along the length direction of the rice loading trough (2), the rice loading trough (2) is a blind hole opened at the top, a decimeter hole (4) is provided on the outside of the rice hole (3) and through the thickness direction of the plate body (1), the rice hole (3) is a cylindrical hole and the diameter of its cross section is larger than the maximum diameter of the cross section of the brown rice grain, the rice grain moves under the impetus of power and passes through the rice hole (3) and is limited by the baffle (6) installed on the plate body (1), the cutter (7) is provided at the outer edge of the rice hole (3) for cutting off the rice grain, and a separation hole (5) is provided downwardly at the bottom of the rice hole (3).

2. The rice dropping plate according to claim 1, wherein one end of the rice grain is cut off outside the rice hole and separated from the rice grain inside the rice hole, characterized in that: The bottom of the rice trough (2) is processed with a downwardly concave arc bottom surface (1-1) and transitions to a rice hole (3).

3. The rice dropping plate according to claim 2, wherein one end of the rice grain is cut off outside the rice hole and separated from the rice grain inside the rice hole, characterized in that: The distance between the inner side wall of the baffle (6) and the outer side surface of the rice hole (3) is one third to one half of the length of the brown rice.

4. The rice dropping plate according to claim 1 , wherein one end of the rice grain is cut off outside the rice hole and separated from the rice grain inside the rice hole, characterized in that: Any distance from the center point of the cross section of the decimeter hole (4) and the separation hole (5) to the hole edge is greater than half of the maximum side length or half of the diagonal length of the brown rice grain falling section entity.

5. A rice dropping plate in which one end of a rice grain is cut off outside a rice hole and separated from the rice grain inside the rice hole, comprising a plate body (1) with a plurality of rice loading grooves (2) provided on the plate body (1), characterized in that: The invention further comprises a baffle (6), and a rice hole (3) communicating with the rice loading trough (2) is respectively provided on the left and right side walls of the plate body (1) along the length direction of the rice loading trough (2), the rice loading trough (2) being a blind hole opened at the top, and a decimeter hole (4) is provided on the outside of the rice hole (3) and penetrating through the thickness direction of the plate body (1), the rice hole (3) being a cylindrical hole and having a cross-sectional diameter larger than the maximum cross-sectional diameter of the brown rice grains, and the rice grains are moved successively under the driving force and pass through the rice hole (3) and are then limited by the baffle (6) installed on the plate body (1), a cutter (7) is provided at the outer edge of the rice hole (3) for cutting off the rice grains, and a separation hole (5) is provided downwardly at the bottom of the rice hole (3).

6. The rice dropping plate according to claim 5, wherein one end of the rice grain is cut off outside the rice hole and separated from the rice grain inside the rice hole, characterized in that: The distance between the inner side wall of the baffle (6) and the outer side of the rice hole (3) is the length of the tip section of the cut brown rice grain containing the complete embryo.

7. The rice dropping plate according to claim 6, wherein one end of the rice grain is cut off outside the rice hole and separated from the rice grain inside the rice hole, characterized in that: An annular recess (6-1) is provided on the inner side wall of the baffle (6) at a position opposite to the center of the rice hole (3).

8. The rice dropping plate according to claim 7, wherein one end of the rice grain is cut off outside the rice hole and separated from the rice grain inside the rice hole, characterized in that: Any distance from the center point of the cross section of the decimeter hole (4) and the separation hole (5) to the hole edge is greater than half of the maximum side length or half of the diagonal length of the brown rice grain falling section entity.

9. A brown rice processing machine using the rice dropping plate according to any one of claims 1 to 8, wherein one end of the rice grain is cut off outside the rice hole and separated from the rice grain inside the rice hole, characterized in that: It comprises a plate body (1) and an integrated pressure cover (10), the integrated pressure cover (10) is mounted on the plate body (1), and a baffle (6) is respectively provided at the inner ring and the outer ring of the upper surface of the plate body (1), an annular groove is processed in the middle of the outer surface of each baffle (6), a ventilation steel mesh (11) is embedded in the inner part of the annular groove, an annular pit (6-1) is provided on the inner side wall of the ventilation steel mesh (11) at a position relative to the center of the rice hole (3) on the plate body (1), two blade mounting holes are uniformly processed along the circumferential direction on the lower surface of the integrated pressure cover (10), the two blade mounting holes are symmetrically staggered relative to the center line of the rice hole (2) on the plate body (1), a cutter (7) is provided inside each blade mounting hole, an air duct is respectively processed on the outer surface and the inner surface of the integrated pressure cover (10), and the two air ducts of the integrated pressure cover (10) are staggered, and the two air ducts are both connected to the inside of the rice hole (2) on the plate body (1).

10. The brown rice processing machine according to claim 9, characterized in that: A blade mounting hole is provided between the end of one of the air channels and the head end of the other air channel on the integrated pressure cover (10), and another blade mounting hole is provided between the head end of one of the air channels and the end of the other air channel on the integrated pressure cover (10).

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