Air-blowing type feeder

Abstract

The invention discloses an air-blowing type feeder, which belongs to the technical field of aquaculture and comprises a storage part, a refining part and a feeding part. The feeding part comprises a feeding shell, a feeding inlet and an air inlet; the air blowing section is located on the rear portion of the interior of the feeding shell and communicates with the feeding inlet and the air inlet, the contraction section communicates with the front portion of the air blowing section, the feeding section communicates with the front portion of the contraction section, and the feeding outlet is formed in the front portion of the feeding section. The internal space of the contraction section is gradually reduced from the air blowing section to the feeding section; and a flow guide structure for directly guiding air flow to the contraction section from the air inlet is mounted in the air blowing section. The air-blowing type feeder is used for fish pond feeding, when compressed air drives bait to flow, the feeding part of the air-blowing type feeder can provide the flowing speed of the bait through a venturi structure jointly formed by the air-blowing section, the contraction section and the feeding section, and then remote feeding is achieved, so that traditional mechanical throwing is replaced; and a low-breakage-rate, high-uniformity and clean feeding process is realized.

Description

Technical Field

[0001] The invention relates to the technical field of aquaculture, in particular to an air-blowing feeding machine. Background Art

[0002] In fish farming, feeders are key equipment, their performance directly impacting feed utilization, farming costs, and the water environment. Traditional feeders often use mechanically distributed feed pans (such as rotating paddles) to distribute feed into the pond through mechanical force.

[0003] However, this approach has the following drawbacks:

[0004] High breakage rate: Mechanical force (such as paddle impact) can easily cause bait particles to break, producing a large amount of powdery residue, reducing feed utilization (powder easily sinks to the bottom or dissolves and is lost), and polluting the water body (powder suspension increases dissolved oxygen consumption).

[0005] The feeding distance is short and uneven: Mechanical throwing relies on centrifugal force or vibration, and the bait trajectory is limited by the rotation speed and angle, making it difficult to achieve uniform coverage over long distances. Local accumulation or omissions are prone to occur, resulting in uneven feeding of fish.

[0006] Poor cleanability: Mechanical parts (such as paddles and screens) are prone to retaining bait residues, which can breed bacteria after long-term use, affecting feed hygiene and even causing fish diseases. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an air-blowing feeding machine for fish ponds, which focuses on improving the feeding part. When compressed air accelerates the flow of bait, the Venturi structure composed of the air-blowing section, the contraction section and the feeding section can increase the flow rate of the bait, thereby realizing a long-distance, low-breakage, high-uniformity and clean feeding process, thereby replacing the traditional mechanical throwing method.

[0008] The technical solution of the present invention is achieved as follows:

[0009] An air-blowing feeding machine comprises a material storage part at the top, a material mixing part connected to the bottom of the material storage part, and a feeding part connected to the bottom of the material mixing part; the feeding part comprises a feeding shell, a feeding inlet opened at the top of the feeding shell and connected to the material mixing part, and an air inlet opened at the rear end of the feeding shell; it also comprises an air-blowing section located at the rear of the feeding shell and connected to the feeding inlet and the air inlet, a contraction section connected to the front of the air-blowing section, a feeding section connected to the front of the contraction section, and a feeding outlet opened in the front of the feeding section; the internal space of the contraction section gradually becomes smaller from the air-blowing section to the feeding section, wherein the contraction section is a "contracted throat" structure in the Venturi effect; a flow guide structure is installed in the air-blowing section for guiding the airflow directly from the air inlet to the contraction section.

[0010] By adopting the above scheme, the air-blowing feeding machine is used for feeding in fish ponds. When the compressed air drives the bait to flow, the feeding part can provide the flow rate of the bait through the Venturi structure composed of the air-blowing section, the contraction section and the feeding section, thereby realizing long-distance feeding, thereby replacing traditional mechanical throwing and achieving a low breakage rate, high uniformity and clean feeding process.

[0011] As a preferred embodiment of an air-blowing feeding machine, the storage part includes a vertical storage box, a box cover that is detachably installed (using threads or snaps, etc.) on the top of the vertical storage box, and a pressure relief hole opened on the top side wall and the box cover of the vertical storage box; wherein, the vertical storage box is used to store feed, and the box cover is removable for replenishing feed; the pressure relief hole (diameter 5-8mm) is used to balance the internal and external air pressure during storage, to avoid negative pressure blockage or positive pressure leakage due to the falling of feed during feeding.

[0012] As a preferred embodiment of an air-blowing feeding machine, the feeding part includes a mixing shell, a mixing inlet connected to the top of the mixing shell, a mixing outlet connected to the bottom of the mixing shell, a mixing motor installed horizontally inside the mixing shell, and a mixing barrel driven to rotate by the mixing motor; wherein, the surface of the mixing barrel is provided with a plurality of mixing grooves distributed in a circumferential array, and the surface of the mixing groove is an arc surface (radius R = 8-15mm), which is driven to rotate by the mixing motor to evenly spread the feed falling into the mixing shell to avoid accumulation, thereby ensuring that the feed entering the feeding inlet is evenly distributed.

[0013] As a preferred embodiment of an air-blowing feeding machine, the vertical cross-section of the air-blowing section is an equidistant inverted triangular mouth (i.e., an isosceles triangle with a wide upper base and a narrow lower base, and the slopes of each side are consistent), the vertex angle is 60-90°, and the ratio of the upper base width to the lower base width is 2:1-3:1. The inverted triangular cross-section can guide the bait to naturally converge into the central channel, forming a stable contact interface with the airflow entering the air inlet.

[0014] As a preferred embodiment of an air-blowing feeding machine, the vertical cross-section of the contraction section is a gradual V-shaped mouth (i.e., the inner walls on both sides are inclined straight lines that intersect at the bottom point, and the inclination angle gradually changes along the axial direction). The ratio of the top width to the bottom width is 3:1-5:1, and the angle is 60-100°. The gradual V-shaped cross-section can further constrain the mixing path of the airflow and bait, avoid diffusion, and enhance the acceleration effect of the Venturi effect.

[0015] As a preferred embodiment of an air-blowing feeding machine, the cross-section of the feeding section is an equidistant V-shaped opening (i.e., the inner walls on both sides are parallel and inclined to form a stable flow channel); the ratio of the height H2 of the feeding section to the height H1 of the air-blowing section is 0.3-0.6:1; the length of the contraction section is 1 / 5-1 / 3 of the total length of the feeding shell; through the synergistic effect of the contraction section and the V-shaped cross-section of the feeding section, the high-speed airflow and the bait mixture are transmitted along the stable flow channel and finally sprayed evenly from the feeding outlet.

[0016] As a preferred embodiment of an air-blowing feeding machine, the guide structure is a guide tube connected to the air inlet, the guide tube extends directly from the air inlet to the contraction section, and the diameter of the guide tube gradually decreases from the air inlet to the contraction section (that is, the guide tube is an axially gradually reducing tube); the diameter of the guide tube linearly changes along the axial direction, and its gradual slope is 0.2-0.5mm / mm (that is, the diameter decreases by 0.2-0.5mm per millimeter of axial length). The gradual reduction design can accelerate the air flow speed, form a high-speed jet flow, and drive the bait to flow synchronously. At the same time, the bait is not easy to accumulate on the top of the guide tube after falling.

[0017] As a preferred embodiment of an air-blowing feeding machine, the guide structure is an inclined guide plate, and the guide plate is spaced apart from the bottom of the air-blowing section with a first opening allowing air flow from the air inlet to the contraction section, and the first opening is for high-pressure air flow to pass through, and the guide plate is spaced apart from the top of the air-blowing section with a second opening allowing bait to flow from the feeding inlet to the contraction section, and the second opening is for bait to pass through; the angle between the guide plate and the horizontal plane is 25-40°, and the high-pressure air flow and the bait are separated by the guide plate, so that the air flow and the bait are mixed more evenly, avoiding local high-speed air flow directly impacting the feed particles, and at the same time reducing air flow leakage from the feeding inlet.

[0018] As a preferred embodiment of an air-blowing feeding machine, the front end of the feeding shell is fixed with a front end cover covering the area outside the feeding outlet in a snap-fit ​​manner; the rear side of the front end cover is connected with a snap buckle, and a slot is provided around the feeding outlet for use with the snap buckle (the slot depth is 5-10mm, and the width matches the snap buckle). The snap buckle is made of elastic plastic, and the front end cover can be quickly disassembled and assembled through the cooperation of the snap buckle and the slot, which is convenient for cleaning the blockage of the feeding outlet or maintaining the internal structure.

[0019] After adopting the above technical solution, the beneficial effects of the present invention are:

[0020] 1. Low breakage rate: The gradual V-shaped mouth design of the contraction section makes the airflow and bait mix more evenly, avoiding the direct impact of local high-speed airflow on the feed particles; the equidistant V-shaped mouth of the feeding section stabilizes the airflow direction and reduces the collision between the bait and the tube wall; and there is no mechanical impact or friction throughout the process (only the gentle interaction of airflow and bait), and the breakage rate is reduced by more than 80% compared with traditional mechanical feeding.

[0021] 2. Long-distance feeding: The Venturi structure composed of air blowing section (inverted triangle) → contraction section (gradual V-shape) → feeding section (equidistant V-shape) gradually reduces the cross-sectional area of ​​the contraction section, and uses the Venturi effect to accelerate the airflow (the air flow speed can be increased from 5-8m / s at the air inlet to 15-25m / s at the end of the contraction section), thereby greatly improving the bait flow rate. The feeding distance is increased by 2-3 times compared with the traditional method (for example, the traditional feeding distance is 3-5m, and this structure can reach 8-12m), and the coverage range is wider.

[0022] 3. High uniformity: The equidistant V-shaped cross-section of the feeding section constrains the mixture of airflow and bait to form a stable jet; the flare at the feeding outlet, which is naturally expanded by the V-shaped cross-section (the flare angle is consistent with the V-shaped angle of the feeding section), evenly disperses the jet to the fish pond, avoiding local accumulation or omission, and ensuring more uniform feeding of fish.

[0023] 4. Clean feeding: Pneumatic drive has no mechanical parts directly contacting the bait (only the airflow interacts with the bait), avoiding the problem of residual debris in mechanical gaps; the "air film" formed by the high-speed airflow inhibits the diffusion of bait powder, reduces suspended matter on the water surface, and improves the breeding environment; the snap-on design of the front cover supports quick cleaning to further ensure hygiene. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a three-dimensional structural diagram of an air-blowing feeding machine;

[0026] Figure 2 It is a three-dimensional structural diagram of the storage part;

[0027] Figure 3 This is the internal structure diagram of the storage part;

[0028] Figure 4 It is a three-dimensional structural diagram of the material mixing part;

[0029] Figure 5 This is the internal structure diagram of the material mixing part;

[0030] Figure 6 for Figure 1 The three-dimensional structure diagram of the middle mixing barrel;

[0031] Figure 7 The three-dimensional structure of the feeding part in Example 1 Figure 1 ;

[0032] Figure 8 The three-dimensional structure of the feeding part in Example 1 Figure 2 ;

[0033] Figure 9 It is a left view of the feeding part in Example 1;

[0034] Figure 10 The internal structure of the feeding part in Example 1 Figure 1 ;

[0035] Figure 11 for Figure 10 A partial enlarged view of point A in the middle;

[0036] Figure 12 The internal structure of the feeding part in Example 1 Figure 2 ;

[0037] Figure 13 This is a three-dimensional structural diagram showing the vertical cross-sectional shape of the air blowing section in Example 1;

[0038] Figure 14 This is a three-dimensional structural diagram showing the vertical cross-sectional shape of the contraction section in Example 1;

[0039] Figure 15 This is a three-dimensional structural diagram showing the vertical cross-sectional shape of the feeding section in Example 1;

[0040] Figure 16 This is the internal structure diagram of the feeding part in Example 2.

[0041] Markings in the figure: 1-storage part; 101-vertical storage box; 102-box cover; 103-pressure relief hole; 2-scaling part; 201-scaling shell; 202-scaling inlet; 203-scaling outlet; 204-scaling motor; 205-scaling barrel; 206-scaling trough; 3-feeding part; 301-feeding shell; 302-feeding port; 303-air inlet; 304-air blowing section; 305-contraction section; 306-feeding section; 307-feeding port; 308-guide pipe; 309-front end cover; 310-clip; 311-clip slot; 312-guide plate; 313-port one; 314-port two. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] Example 1, as Figures 1 to 10 As shown, an air-blowing feeding machine is used for feeding fish ponds, which specifically includes a storage part 1 at the top, a mixing part 2 connected to the bottom of the storage part 1, and a feeding part 3 connected to the bottom of the mixing part 2; the feeding part 3 includes a feeding shell 301 (made of 304 stainless steel with strong corrosion resistance), a feeding inlet opened at the top of the feeding shell 301 and connected to the mixing part 2, and an air inlet 303 (diameter φ50mm) opened at the rear end of the feeding shell 301. An air compressor (omitted in the figure) is installed at the air inlet 303. When in use, the air compressor is started first. The machine then enters the feeding section; it also includes an air blowing section 304 located at the rear of the feeding shell 301 and connected to the feeding inlet and air inlet 303, a contraction section 305 connected to the front of the air blowing section 304, a feeding section 306 connected to the front of the contraction section 305, and a feeding outlet opened in front of the feeding section 306; the internal space of the contraction section 305 gradually becomes smaller from the air blowing section 304 to the feeding section 306, wherein the contraction section 305 is a "contracted throat" structure in the Venturi effect; a flow guide structure is installed in the air blowing section 304 to guide the air flow directly from the air inlet 303 to the contraction section 305. When the compressed air drives the bait to flow, the feeding part 3 of the air-blowing feeding machine can provide the bait flow rate through the Venturi structure composed of the air blowing section 304, the contraction section 305 and the feeding section 306, thereby realizing long-distance feeding, thereby replacing traditional mechanical throwing and achieving a low breakage rate, high uniformity and clean feeding process.

[0044] like Figures 2 to 3 As shown, the storage part 1 includes a vertical storage box 101 (20L), a detachable box cover 102 (in the form of a snap 310, of course it can also be a threaded form) installed on the top of the vertical storage box 101, and a pressure relief hole 103 opened on the top side wall of the vertical storage box 101 and the box cover 102; wherein, the vertical storage box 101 is used to store bait, and the box cover 102 is detachable for replenishing bait; the pressure relief hole 103 (diameter 6mm, the diameter can be in the range of 5-8mm) is used to balance the internal and external air pressure during storage, to avoid negative pressure blockage or positive pressure leakage due to the falling of bait when feeding.

[0045] like Figures 4 and 5As shown, the feeding part 3 includes a mixing shell 201, a mixing inlet 202 connected to the top of the mixing shell 201, a mixing outlet 203 connected to the bottom of the mixing shell 201, a mixing motor 204 (power 0.5kW, speed 300r / min) installed horizontally inside the mixing shell 201, and a mixing barrel 205 driven to rotate by the mixing motor 204; wherein, the surface of the mixing barrel 205 is provided with multiple mixing grooves 206 distributed in a circumferential array (a total of eight mixing grooves 206 in the figure), and the surface of the mixing groove 206 is an arc surface (radius R = 10mm, the radius can be in the range of 8-15mm), which is driven to rotate by the mixing motor 204 to evenly spread the bait falling into the mixing shell 201 to avoid accumulation, thereby ensuring that the bait entering the feeding inlet is evenly distributed.

[0046] like Figure 10 、 Figures 12 to 13 As shown, the vertical cross-section of the air blowing section 304 is an equidistant inverted triangle mouth (i.e., an isosceles triangle with a wide upper base and a narrow lower base, and the slopes of each side are consistent), and its top angle is 75°, which can be in the range of 60-90°. The ratio of the upper base width to the lower base width is 2:1, which can be in the range of 2:1-3:1. The inverted triangle cross-section can guide the bait to naturally converge to the central channel, forming a stable contact interface with the airflow entering from the air inlet 303.

[0047] like Figure 10 、 Figures 12 to 14 As shown, the vertical cross-section of the contraction section 305 is a gradual V-shaped mouth (i.e., the inner walls on both sides are inclined straight lines, intersecting at a sharp point at the bottom, and the inclination angle gradually changes along the axial direction), and the ratio of its top width to its bottom width is 4:1, which can be in the range of 3:1-5:1. The angle is 90°, which can be in the range of 60-100°. The gradual V-shaped cross-section can further constrain the mixing path of the airflow and bait, avoid diffusion, and enhance the acceleration effect of the Venturi effect.

[0048] like Figure 10 、 Figures 12 to 15 As shown, the cross-section of the feeding section 306 is an equidistant V-shaped opening (i.e., the inner walls on both sides are parallel and inclined to form a stable flow channel); the ratio of the height H2 (36 mm) of the feeding section 306 to the height H1 (120 mm) of the air blowing section 304 is 0.3, and the ratio can be in the range of 0.3-0.6:1, and the angle is 90°, and the angle can be in the range of 60-100°; the length of the contraction section 305L is 1 / 4 of the total length of the feeding shell 301 (assuming the total length is 400 mm, then L = 100 mm), and the length can be in the range of 1 / 5-1 / 3; through the synergistic effect of the V-shaped cross-section of the contraction section 305 and the feeding section 306, the high-speed airflow and the bait mixture are transmitted along the stable flow channel and finally sprayed out evenly from the feeding outlet.

[0049] like Figure 10 、 Figure 12 As shown, the guide structure is connected to the guide pipe 308 of the air inlet 303, and the guide pipe 308 extends directly from the air inlet 303 to the contraction section 305, and the diameter of the guide pipe 308 gradually decreases from the air inlet 303 to the contraction section 305 (that is, the guide pipe 308 is an axially gradually reducing pipe); the diameter of the guide pipe 308 linearly changes along the axial direction, and its gradual slope is 0.3, and the slope can be within the range of 0.2-0.5mm / mm (that is, the diameter decreases by 0.2-0.5mm per millimeter of axial length), with a total length of 200mm. The gradual reduction design can accelerate the air flow speed (from 0.5m / s to 20m / s), forming a high-speed jet flow, driving the bait to flow synchronously, and at the same time, the bait is not easy to accumulate on the guide pipe 308 after falling.

[0050] like Figures 10 to 12 As shown, the front end of the feeding shell 301 is fixed with a front end cover 309 (made of food-grade PP plastic) covering the area outside the feeding outlet in a snap-fit ​​manner; the rear side of the front end cover 309 is connected to a snap buckle 310, and a slot 311 for use with the snap buckle 310 is provided around the feeding outlet (the slot 311 has a depth of 5 mm, which can be in the range of 5-10 mm, and the width matches the snap buckle 310). The snap buckle 310 is made of elastic plastic, and the front end cover 309 can be quickly disassembled and assembled through the cooperation of the snap buckle 310 and the slot 311, which is convenient for cleaning blockages in the feeding outlet or maintaining the internal structure.

[0051] The working principle of this embodiment is as follows: during operation, the bait falls from the storage box to the mixing barrel 205, is evenly distributed through the mixing trough 206, and then intermittently enters the feeding inlet; the compressed air (pressure 0.3MPa) of the air compressor enters the guide tube 308 through the air inlet 303, and the air flow is accelerated and enters the contraction section 305, where it mixes with the bait to form a high-speed feed-air mixed flow (speed of about 20m / s). The bait is finally thrown out from the feeding outlet, with a delivery distance of 15-20 meters and a bait breakage rate of ≤5%.

[0052] Example 2, as Figure 16As shown, the only difference between this embodiment and the first embodiment is that, based on the first embodiment, the guide structure is replaced by the guide tube 308 with an inclined guide plate 312, and the guide plate 312 is spaced apart from the bottom of the air blowing section 304 with a passage 1 313 allowing the airflow to flow from the air inlet 303 to the contraction section 305, and the passage 1 313 can allow high-pressure airflow to pass through, and the guide plate 312 is spaced apart from the top of the air blowing section 304 with a passage 2 314 allowing the bait to flow from the feeding inlet to the contraction section 305, and the passage 2 314 can allow the bait to pass through; the angle between the guide plate 312 and the horizontal plane is 25-40°, and the high-pressure airflow and the bait are separated by the guide plate 312, so that the airflow and the bait are mixed more evenly, avoiding local high-speed airflow directly impacting the bait particles, and at the same time reducing the leakage of airflow from the feeding inlet.

[0053] The working principle of this embodiment is as follows: during operation, the bait falls from the storage box to the mixing barrel 205, is evenly distributed through the mixing trough 206, and then intermittently enters the feeding inlet; the compressed air of the air compressor enters the air blowing section 304 through the air inlet 303, and flows to the contraction section 305 through the port 1 313 of the guide plate 312; when the bait falls from the feeding inlet, it enters the contraction section 305 synchronously with the air flow through the port 2 314, enters the feeding section 306 after mixing, and is finally thrown out at a speed of 18-22m / s, with a delivery distance of 12-18 meters and a crushing rate of ≤6%.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An air-blowing feeding machine, comprising a material storage portion at the top, a material refining portion connected to the bottom of the material storage portion, and a feeding portion connected to the bottom of the material refining portion; Its characteristics are: The feeding part includes a feeding shell, a feeding inlet opened at the top of the feeding shell and connected to the material mixing part, and an air inlet opened at the rear end of the feeding shell; it also includes an air blowing section located at the rear of the feeding shell and connected to the feeding inlet and the air inlet, a contraction section connected to the front of the air blowing section, a feeding section connected to the front of the contraction section, and a feeding outlet opened in front of the feeding section; the internal space of the contraction section gradually becomes smaller from the air blowing section to the feeding section; a guide structure is installed in the air blowing section to guide the airflow directly from the air inlet to the contraction section.

2. The air-blowing feeding machine according to claim 1, wherein: The material storage part comprises a vertical material storage box, a box cover detachably mounted on the top of the vertical material storage box, and pressure relief holes arranged on the side wall of the top of the vertical material storage box and the box cover.

3. The air-blowing feeding machine according to claim 1, wherein: The feeding part includes a screed shell, a screed inlet connected to the top of the screed shell, a screed outlet connected to the bottom of the screed shell, a screed motor installed transversely inside the screed shell, and a screed barrel driven to rotate by the screed motor.

4. The air-blowing feeding machine according to claim 3, wherein: The surface of the material mixing barrel is provided with a plurality of material mixing grooves distributed in a circumferential array, and the surface of the material mixing groove is an arc surface.

5. The air-blowing feeding machine according to claim 1, wherein: The vertical cross section of the air blowing section is an equidistant inverted triangle opening; the vertical cross section of the contraction section is a gradually changing V-shaped opening; and the cross section of the feeding section is an equidistant V-shaped opening.

6. The air-blowing feeding machine according to claim 5, characterized in that: The guide structure is a guide tube connected to the air inlet, which extends directly from the air inlet to the contraction section, and the diameter of the guide tube gradually decreases from the air inlet to the contraction section; the diameter of the guide tube linearly changes along the axial direction, and its gradient slope is 0.2-0.5mm / mm.

7. The air-blowing feeding machine according to claim 5, characterized in that: The guide structure is an inclined guide plate, and the guide plate is spaced apart from the bottom of the air blowing section with a passage one allowing the air flow to flow from the air inlet to the contraction section, and the guide plate is spaced apart from the top of the air blowing section with a passage two allowing the bait to flow from the feeding inlet to the contraction section; the angle between the guide plate and the horizontal plane is 25-40°.

8. The air-blowing feeding machine according to claim 1, wherein: The ratio of the height H2 of the feeding section to the height H1 of the air blowing section is 0.3-0.6:

1.

9. The air-blowing feeding machine according to claim 8, characterized in that: The length of the contraction section is 1 / 5-1 / 3 of the total length of the feeding shell.

10. The air-blowing feeding machine according to claim 1, characterized in that: A front end cover covering the area outside the feeding outlet is fixedly mounted on the front end of the feeding shell in a snap-fit ​​manner; a buckle is connected to the rear side of the front end cover, and a slot for use with the buckle is provided around the feeding outlet.

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