Automatic packaging machine for tea finished products

Abstract

The invention discloses an automatic packaging machine for tea finished products, which relates to the technical field of automatic packaging equipment, and comprises a support, a feeding box, a discharging box and a packaging box, the screening net plate is arranged in the feeding box; the driving assembly is arranged on one side of the upper end of the support, when the driving assembly drives the feeding box to reciprocate up and down, the screening net plate in the feeding box shakes and screens finished tea leaves, and meanwhile, the air inlet assembly on the side portion of the feeding box continuously feeds air and provides air pressure thrust for the overturning assembly connected with the screening net plate; after the shaken and sieved tea leaves are shaken out, an exhaust assembly connected with an overturning assembly is triggered, and after exhaust is completed, the screening net plate is driven by the overturning assembly to reset; according to the equipment, integrated continuous operation of tea screening and packaging is achieved, the cleanliness and the high-quality rate of tea finished products are remarkably improved, the equipment structure is simplified, and the operation complexity and the maintenance cost are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic packaging equipment, in particular to a tea product automatic packaging machine. BACKGROUND

[0002] As a widely consumed beverage, tea products need to be packaged before circulation to ensure the convenience and quality stability of storage, transportation and sales. At present, various tea automatic packaging machines have appeared on the market, which can realize the processes of quantitative filling, sealing and label sticking of tea, significantly improving the packaging efficiency and reducing the labor cost. This kind of equipment usually cooperates through conveying belt, metering device and heat sealing mechanism to complete the automatic process from tea filling to bag output. However, the existing tea automatic packaging machines still have some deficiencies in practical application: the existing equipment generally lacks integrated screening structure matched with the packaging process, and tea is easy to produce debris in the early processing or conveying process. These debris mixed in the finished product during packaging will affect the integrity and appearance of tea, and reduce the high-quality rate and market value of the product. If the above problems are to be solved, an independent screening device needs to be introduced additionally in the packaging link, which can remove the debris to a certain extent, but it needs to add screening, debris collection, material transfer and other processes, resulting in complex overall process, redundant equipment layout, and increasing operation difficulty and maintenance cost. Therefore, we propose a tea product automatic packaging machine. SUMMARY

[0003] The purpose of the present application is to provide a tea product automatic packaging machine to solve the above-mentioned deficiencies in the prior art.

[0004] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: a tea product automatic packaging machine, comprising a packaging machine main body, a support fixed on the upper end of the packaging machine main body, and further comprising: a feeding box arranged on the upper end of the support; a screening net plate arranged inside the feeding box; a driving assembly arranged on one side of the upper end of the support, when the driving assembly drives the feeding box to move up and down reciprocally, the screening net plate inside the feeding box shakes and screens the tea product, at the same time, the air inlet assembly on the side of the feeding box continuously inlets air, and provides air pressure thrust for the turnover assembly connected with the screening net plate, and then turns over the screening net plate, after the shaken and screened tea is shaken out, triggers the air outlet assembly connected with the turnover assembly, and resets the screening net plate after completing air outlet.

[0005] As a further description of the above technical scheme: a plurality of guide sleeves are fixed on the side of the feeding box, and a plurality of guide rods are fixed on the upper end of the support, and the guide sleeves are sleeved on the guide rods.

[0006] As a further description of the above technical solution: the driving assembly comprises a motor fixed to one side of the upper end of the support, a Z-shaped rod is connected to the power shaft end of the motor, a groove plate is fixed to one side of the outer wall of the feed tank, and the end of the Z-shaped rod is oriented to slide along the inner groove horizontally arranged on the groove plate.

[0007] As a further description of the above technical solution: the air inlet assembly comprises an air inlet box fixed to the outer wall of the side of the feed tank, an air pushing plate is slidably installed in the air inlet box, and a spring is connected between the air pushing plate and the air inlet box.

[0008] As a further description of the above technical solution: the lower end of the air inlet box is fixed with a connecting rod, the bottom end of the connecting rod is fixed with a piston, the lower end of the piston is bonded with a rubber skin bowl, the lower end of the support is fixed with a cylinder, and the piston and the rubber skin bowl are slidably arranged in the cylinder, and a gas guide pipe is connected between the side wall of the lower end of the cylinder and the air inlet box.

[0009] As a further description of the above technical solution: the turnover assembly comprises a rack fixed to the upper end of the air pushing plate, a gear is rotatably installed on the inner wall of the air inlet box, the gear is engaged with the rack, and the gear shaft is connected with the screening mesh plate, and when the gear rotates, the screening mesh plate is driven to rotate synchronously through the shaft.

[0010] As a further description of the above technical solution: the exhaust assembly comprises a reciprocating connecting rod arranged outside the air inlet box, the reciprocating connecting rod is connected with the gear shaft, a T-shaped rod is rotatably connected to the lower end of the reciprocating connecting rod, a limiting sleeve is fixed to the outer wall of the air inlet box, and the T-shaped rod slides up and down inside the limiting sleeve.

[0011] As a further description of the above technical solution: the T-shaped rod is fixed with a sealing sheet on one side, and an elastic plastic strip is fixed to the other side of the T-shaped rod, a protrusion one is fixed to the end of the elastic plastic strip, an air outlet is arranged on the air inlet box, and the air outlet is on the same vertical line with the sealing sheet.

[0012] As a further description of the above technical solution: the outer wall of the air inlet box is fixed with a protrusion two and a protrusion three, the protrusion one, the protrusion two and the protrusion three are all in triangular structure, and the protrusion one, the protrusion two and the protrusion three are on the same vertical line.

[0013] In the above technical solution, the tea product automatic packaging machine provided by the application has the following beneficial effects: The application integrates a reciprocating mechanism driven by a Z-shaped rod and a groove plate in the feeding box, drives the screening mesh plate to continuously shake during the feeding process, and uses the up-down movement of the feeding box to drive the air inlet assembly and the exhaust assembly to work together, controls the air pushing plate and the rack in the cycle of air pressure accumulation and release, and accurately drives the screening mesh plate to periodically overturn and reset; in this process, the screening mesh plate first separates the debris to the bottom of the equipment, then shakes out the high-quality tea leaves and directly sends them into the downstream bag-making, filling and sealing packaging unit, so that the integration of tea screening and packaging is realized without the need to add independent screening equipment and additional transfer processes, which not only significantly improves the purity and high-quality rate of tea products, but also simplifies the equipment structure, reduces the operation complexity and maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0015] Figure 1 The first perspective structural schematic diagram provided for the embodiment of the present application; Figure 2 The second perspective structural schematic diagram provided for the embodiment of the present application; Figure 3 The screening structure schematic diagram provided for the embodiment of the present application; Figure 4 The feeding box structural schematic diagram provided for the embodiment of the present application; Figure 5 The A structure schematic diagram provided for the embodiment of the present application; Figure 3 Figure 6 The feeding box structural schematic diagram provided for the embodiment of the present application; Figure 7 The feeding box structural schematic diagram provided for the embodiment of the present application; Figure 8 The screening mesh plate structural schematic diagram provided for the embodiment of the present application.

[0016] Explanation of reference signs: ​Support 1; feed box 2; screening mesh plate 3; drive assembly 4; motor 41; Z-shaped rod 42; groove plate 43; air inlet assembly 5; air inlet box 51; air push plate 52; spring 53; connecting rod 54; piston 55; rubber bowl 56; cylinder 57; air guide pipe 58; turnover assembly 6; rack 61; gear 62; air outlet assembly 7; reciprocating connecting rod 71; T-shaped rod 72; limiting sleeve 73; sealing sheet 74; elastic plastic strip 75; protrusion one 76; air outlet 77; protrusion two 78; protrusion three 79; guide sleeve 8; guide rod 9. DETAILED DESCRIPTION

[0017] In order to make the technical personnel in the art better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0018] Please refer to Figures 1-8 The present application provides a kind of tea finished product automatic packaging machine technical scheme: including packaging machine main body, packaging machine main body upper end is fixed with support 1, still include: feed box 2, setting in support 1 upper end;Screening mesh plate 3, setting in feed box 2 interior;Drive assembly 4, setting in support 1 upper end one side, when drive assembly 4 drives feed box 2 to carry out reciprocating motion, the screening mesh plate 3 in the interior of feed box 2 is to tea finished product is shaken and sieved, simultaneously, the air inlet assembly 5 of feed box 2 side portion continues to air, and provides air pressure thrust for turnover assembly 6 connected with screening mesh plate 3, and is turned over to screening mesh plate 3 along with, after tea after shaking and sieving is shaken out, triggers the air outlet assembly 7 connected with turnover assembly 6, is reset after completing exhaust screening mesh plate 3 is driven by turnover assembly 6;Drive assembly 4 makes feed box 2 and interior screening mesh plate 3 reciprocating motion realizes shaking and sieving, while shaking and sieving, air inlet assembly 5 generates compressed gas while moving with feed box 2, gas pushes turnover assembly 6 to act, makes screening mesh plate 3 gradually turn over, to complete the tea that is sieved is poured and discharged, when screening mesh plate 3 is turned over to certain angle, will be linked to trigger air outlet assembly 7 to open, releases the gas pressure in air inlet assembly 5, after gas release, screening mesh plate 3 is driven to return to horizontal position by the reset force of turnover assembly 6, prepares for next sieving operation.

[0019] In still another embodiment of the present application, a plurality of guide sleeves 8 are fixed to the side of the feed box 2, and a plurality of guide rods 9 are fixed to the upper end of the support 1, the guide sleeves 8 being sleeved on the guide rods 9; the guide sleeves 8 and the guide rods 9 cooperate with each other to guide and limit the reciprocating movement of the feed box 2, ensuring that the movement trajectory is stable and does not deviate.

[0020] In still another embodiment of the present application, the driving assembly 4 comprises a motor 41 fixed to one side of the upper end of the support 1, the power shaft end of the motor 41 is connected with a Z-shaped rod 42, a groove plate 43 is fixed to one side of the outer wall of the feeding box 2, and the end of the Z-shaped rod 42 slides along the inner groove horizontally arranged on the groove plate 43; the motor 41 drives the Z-shaped rod 42 to rotate, and the end of the Z-shaped rod 42 slides in the horizontal inner groove of the groove plate 43, so that the rotary motion of the Z-shaped rod 42 is converted into the reciprocating linear motion of the groove plate 43 and the feeding box 2 fixed thereto in the vertical direction.

[0021] In still another embodiment of the present application, the air inlet assembly 5 comprises an air inlet box 51 fixed to the outer wall of the side of the feeding box 2, an air pushing plate 52 is slidingly installed in the air inlet box 51, and a spring 53 is connected between the air pushing plate 52 and the air inlet box 51; the air pushing plate 52 divides the inside of the air inlet box 51 into two air chambers, and the spring 53 provides the air pushing plate 52 with a reset elastic force; when the air pressure in the lower air chamber increases, the air pushing plate 52 is pushed to compress the spring 53 and move upward; and when the air pressure is released, the spring 53 pushes the air pushing plate 52 to move downward and reset.

[0022] In still another embodiment of the present application, the air inlet box 51 is fixed with a connecting rod 54 at the lower end, the connecting rod 54 is fixed with a piston 55 at the bottom end, the piston 55 is bonded with a rubber skin bowl 56 at the lower end, the support 1 is fixed with a cylinder 57 at the lower end, the piston 55 and the rubber skin bowl 56 are slidingly arranged in the cylinder 57, and a gas guide pipe 58 is connected between the lower end side wall of the cylinder 57 and the air inlet box 51; the air inlet box 51, the connecting rod 54, the piston 55 and the rubber skin bowl 56 move up and down with the feeding box 2 as a whole; when the feeding box 2 moves downward, the piston 55 and the rubber skin bowl 56 slide downward in the cylinder 57 to compress air, the rubber skin bowl 56 is opened tightly against the cylinder wall under the air pressure to form a seal, the compressed air is unidirectionally pressed into the lower air chamber of the air inlet box 51 through the gas guide pipe 58; and when the feeding box 2 moves upward, the piston 55 slides upward, the air pressure in the lower part of the cylinder 57 decreases, the outer air pushes the edge of the loosened rubber skin bowl 56 into the lower part of the cylinder 57 to realize air supplement.

[0023] In still another embodiment of the present application, the turnover assembly 6 comprises a rack 61 fixed to the upper end of the air pushing plate 52, and a gear 62 is rotatably installed on the inner wall of the air inlet box 51, the gear 62 is engaged with the rack 61, the wheel shaft of the gear 62 is connected with the screening mesh plate 3, and the gear 62 drives the screening mesh plate 3 to rotate synchronously through the wheel shaft when the gear 62 rotates; when the air pushing plate 52 moves up and down under the air pressure, the rack 61 fixed thereto moves linearly, the rack 61 drives the gear 62 engaged therewith to rotate, and the wheel shaft of the gear 62 transmits the rotary motion to the screening mesh plate 3, so that the turnover and reset of the screening mesh plate 3 are realized.

[0024] In still another embodiment of the present application, the exhaust assembly 7 comprises a reciprocating connecting rod 71 arranged outside the air inlet box 51, the reciprocating connecting rod 71 is connected with the wheel shaft of the gear 62, and the lower end of the reciprocating connecting rod 71 is rotatably connected with a T-shaped rod 72, the outer wall of the air inlet box 51 is fixedly connected with a limiting sleeve 73, and the T-shaped rod 72 slides up and down along the inside of the limiting sleeve 73; when the gear 62 rotates, the wheel shaft drives the reciprocating connecting rod 71 to swing, and then pulls or pushes the T-shaped rod 72 to slide in the vertical direction under the constraint of the limiting sleeve 73, so as to convert the rotary motion of the gear 62 into the linear motion of the T-shaped rod 72.

[0025] In still another embodiment of the present application, the T-shaped rod 72 is fixed with a sealing sheet 74 on one side, and is fixed with an elastic plastic strip 75 on the other side, the end of the elastic plastic strip 75 is fixed with a protrusion one 76, the air inlet box 51 is provided with an exhaust port 77, and the exhaust port 77 is on the same vertical line with the sealing sheet 74; the up-and-down sliding of the T-shaped rod 72 drives the synchronous motion of the sealing sheet 74 and the elastic plastic strip 75 on it, the sealing sheet 74 is used for blocking or opening the exhaust port 77, and the elastic plastic strip 75 can be elastically bent under stress, and the protrusion one 76 at the end thereof is used for interacting with other protrusions to realize locking and releasing.

[0026] In still another embodiment of the present application, the outer wall of the air inlet box 51 is fixed with a protrusion two 78 and a protrusion three 79, the protrusion one 76, the protrusion two 78 and the protrusion three 79 all have a triangular structure, and are on the same vertical line; the protrusion two 78 and the protrusion three 79 are used as fixed blocking points, in the process of the up-and-down motion of the protrusion one 76 driven by the T-shaped rod 72, the protrusion one 76 can be in contact with, extruded by and elastically deformed by the triangular inclined surface of the protrusion two 78 or the protrusion three 79, so as to realize the two states of passing through or being stuck, and the moving path and the final position are controlled by the interaction between the protrusions.

[0027] In operation, the external tea is conveyed into the feeding box 2 by the external feeding device, and then the motor 41 is started by the relevant staff, the Z-shaped rod 42 is rotated by the motor 41, the end of the Z-shaped rod 42 slides in the groove of the groove plate 43 fixed on one side of the feeding box 2, so as to drive the feeding box 2 to reciprocate up and down along the guide rod 9 on the upper end of the support 1 through the guide sleeve 8, and the screening mesh plate 3 in the feeding box 2 continuously screens the tea products when the feeding box 2 moves. Meanwhile, the upward and downward movement of the feeding box 2 drives the air inlet assembly 5 to work. The air inlet box 51 fixed to the side of the feeding box 2 is connected with the piston 55 through the connecting rod 54. The piston 55 and the rubber bowl 56 slide in the cylinder 57 at the lower end of the support 1. When the feeding box 2 moves downward, the piston 55 moves downward in the cylinder 57, and air is pressed into the air inlet box 51 through the air guide pipe 58, which drives the air push plate 52 to move against the resistance of the spring 53. When the air push plate 52 moves upward, it drives the rack 61 of the turnover assembly 6 to move. The rack 61 is engaged with the gear 62, which is rotated. The gear 62 drives the screen plate 3 to turn over through the wheel shaft, and the tea shaken and sieved is shaken out of the feeding box 2 through the upward and downward movement of the feeding box 2. It is worth noting that when pulling upward, the air pressure in the cylinder 57 decreases, the rubber bowl 56 relaxes and contracts, and the external air enters from the upper part to the lower part through the gap of the rubber bowl 56. When pressing downward, the compressed air expands the rubber bowl like an umbrella, which is tightly attached to the cylinder wall to form a seal. Meanwhile, the air pressure in the lower part increases, and the air is pressed into the air inlet box 51. The whole process relies on the air pressure difference to automatically control the sealing and deflation of the rubber bowl, thereby realizing one-way inflation. During the turnover of the screen plate 3, the wheel shaft of the gear 62 drives the reciprocating connecting rod 71 of the air exhaust assembly 7 to move. The reciprocating connecting rod 71 pulls the T-shaped rod 72 to slide upward along the limiting sleeve 73. When the screen plate 3 has not yet turned over, the protrusion one 76 on the elastic plastic strip 75 is in close contact with the protrusion two 78. As the screen plate 3 continues to shake and sieve, the air inlet assembly 5 continuously injects air into the air inlet box 51. The air pressure in the air inlet box 51 continuously increases. When the air pressure value exceeds the limiting pulling force between the protrusion one 76 and the protrusion two 78, the elastic plastic strip 75 deforms and makes the protrusion one 76 pass the protrusion two 78, and the spring 53 is compressed. When the protrusion one 76 enters the vertical space between the protrusion two 78 and the protrusion three 79, the screen plate 3 continues to turn over, and the sealing sheet 74 on one side of the T-shaped rod 72 slowly moves upward until the protrusion one 76 moves to the position where it is in contact with the protrusion three 79. At this time, the screen plate 3 is about to turn over to the upper limit position, but it is blocked by the protrusion three 79, so the rack 61 and the gear 62 are no longer in transmission and remain stationary. At this time, the air pressure in the space at the lower end of the air push plate 52 in the air inlet box 51 continues to rise. When the air pressure exceeds the critical value at which the protrusion one 76 is in contact with the protrusion three 79, the protrusion one 76 passes the protrusion three 79, and at this time the sealing sheet 74 moves upward to the position where the exhaust port 77 is opened. With the continuous compression of the air inlet assembly 5, the gas starts to be discharged outward through the exhaust port 77, and the air pressure in the air inlet box 51 starts to continuously decrease. As the air pressure in the air inlet box 51 continuously decreases, the compressed spring 53 generates a restoring force and applies it to the protrusion one 76. When the restoring force exceeds the critical value at which the protrusion one 76 is in contact with the protrusion three 79, the protrusion one 76 passes the protrusion two 78 and the protrusion three 79 again and reaches the position below the protrusion three 79. It is worth noting that: the bump two 78 and the bump three 79 shape are all designed with triangular shape, but the triangular slope of the bump two 78 is more gentle than that of the bump three 79, so that the bump one 76 can still overcome the bump two 78 resistance after overcoming the resistance of the bump three 79 when continuing to move down, thereby restoring to the original position; And in the above process, with the extension of the spring 53, the rack 61 drives the gear 62 to rotate again, and the screening screen plate 3 is driven by the gear 62 to return to the horizontal position, and in the resetting process, the gear 62 axle shaft pushes the T-shaped rod 72 down through the reciprocating connecting rod 71, and the sealing sheet 74 reseals the exhaust port 77, and then the next round of tea screening operation is carried out; The tea powder and slag screened out first falls into the bottom of the machine body, and the high-quality tea shaken and screened out subsequently enters the packaging bag and is sealed; The above is worth noting: the packaging process is automatically controlled by the PLC system, and the interval time of the pre-designed packaging and sealing is consistent with the time interval of the single-time shaking and screening of the high-quality tea.

[0028] The screened tea is pulled by the film feeding mechanism to form a cylindrical shape by the former, and a continuous bag body is formed after longitudinal sealing; the bag bottom is formed by transverse sealing at the set position, and the bag top is sealed again after filling the tea and transverse sealing, and then cut off, and finally the finished tea bag is output. The whole process is automatically controlled by the PLC system to realize continuous high-speed packaging and complete a packaging cycle.

[0029] The above only describes some exemplary embodiments of the application by way of illustration, and it is not necessary to modify the described embodiments in various ways without deviating from the spirit and scope of the application for ordinary skilled in the art. Therefore, the above figures and descriptions are illustrative in nature and should not be understood as limiting the scope of the claims of the application.

Claims

1. An automatic packaging machine for finished tea products, comprising a main body of the packaging machine, wherein a support frame (1) is fixed to the upper end of the main body of the packaging machine, characterized in that, Also includes: Feed box (2) is located at the upper end of bracket (1); Screening mesh (3) is installed inside the feed box (2); The drive assembly (4) is located on one side of the upper end of the bracket (1). When the drive assembly (4) drives the feed box (2) to move up and down, the screening screen plate (3) inside the feed box (2) shakes the finished tea. At the same time, the air intake assembly (5) on the side of the feed box (2) continuously intakes air and provides air pressure thrust to the flipping assembly (6) connected to the screening screen plate (3), and flips the screening screen plate (3). After shaking out the tea after the screening, the exhaust assembly (7) connected to the flipping assembly (6) is triggered. After the exhaust is completed, the screening screen plate (3) is driven to reset by the flipping assembly (6).

2. The automatic packaging machine for finished tea products according to claim 1, characterized in that, The feed box (2) has multiple sets of guide sleeves (8) fixed on its side, and the bracket (1) has multiple sets of guide rods (9) fixed on its upper end. The guide sleeves (8) are sleeved on the guide rods (9).

3. The automatic packaging machine for finished tea products according to claim 1, characterized in that, The drive assembly (4) includes a motor (41) fixed to one side of the upper end of the bracket (1). The power shaft end of the motor (41) is connected to a Z-shaped rod (42). A groove plate (43) is fixed to one side of the outer wall of the feed box (2). The end of the Z-shaped rod (42) slides in a direction along the horizontally set inner groove on the groove plate (43).

4. The automatic packaging machine for finished tea products according to claim 1, characterized in that, The air intake assembly (5) includes an air intake box (51) fixed to the outer side wall of the feed box (2). An air push plate (52) is slidably installed inside the air intake box (51), and a spring (53) is connected between the air push plate (52) and the air intake box (51).

5. An automatic tea product packaging machine according to claim 4, characterized in that, A connecting rod (54) is fixed at the lower end of the air intake box (51), a piston (55) is fixed at the bottom end of the connecting rod (54), a rubber cup (56) is bonded to the lower end of the piston (55), a cylinder (57) is fixed at the lower end of the bracket (1), the piston (55) and the rubber cup (56) are slidably disposed inside the cylinder (57), and an air guide pipe (58) is connected between the lower side wall of the cylinder (57) and the air intake box (51).

6. An automatic tea product packaging machine according to claim 4, characterized in that, The flipping assembly (6) includes a rack (61) fixed to the upper end of the air push plate (52), and a gear (62) is rotatably installed on the inner wall of the air inlet box (51). The gear (62) meshes with the rack (61), and the gear (62) shaft is connected to the screening screen plate (3). When the gear (62) rotates, it drives the screening screen plate (3) to rotate synchronously through the shaft.

7. An automatic tea product packaging machine according to claim 6, characterized in that, The exhaust assembly (7) includes a reciprocating connecting rod (71) disposed on the outside of the air intake box (51). The reciprocating connecting rod (71) is connected to the gear (62) shaft, and a T-shaped rod (72) is rotatably connected to the lower end of the reciprocating connecting rod (71). A limiting sleeve (73) is fixed to the outer wall of the air intake box (51), and the T-shaped rod (72) slides up and down along the inside of the limiting sleeve (73).

8. An automatic tea product packaging machine according to claim 7, characterized in that, A sealing plate (74) is fixed on one side of the T-shaped rod (72), and an elastic plastic strip (75) is fixed on the other side of the T-shaped rod (72). A protrusion (76) is fixed at the end of the elastic plastic strip (75). An exhaust port (77) is provided on the air inlet box (51), and the exhaust port (77) and the sealing plate (74) are on the same vertical line.

9. An automatic packaging machine for finished tea products according to claim 8, characterized in that, The outer wall of the air intake box (51) is fixed with protrusion 2 (78) and protrusion 3 (79). Protrusion 1 (76), protrusion 2 (78) and protrusion 3 (79) are all triangular in structure, and protrusion 1 (76), protrusion 2 (78) and protrusion 3 (79) are on the same vertical line.

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