Online sampling and detecting device for cut tobacco shreds

Abstract

The utility model discloses a cut tobacco online sampling and detecting device which comprises a rack, and a grabbing mechanism and a detecting mechanism are arranged on the rack. The grabbing mechanism comprises a base, the base can move in the front-back direction and the vertical direction of the rack, a grabbing plate is arranged on the base, a plurality of grabbing hooks are arranged at the bottom of the grabbing plate, and the grabbing hooks at the bottom of the grabbing plate are made to retract upwards into the base or stretch downwards out of the lower portion of the base through vertical lifting of the grabbing plate. Positive-pressure air is blown through an air blowing opening of the air blowing assembly, so that tobacco shreds hung on a plurality of grabbing hooks of the grabbing plate are backwards blown off; the detection mechanism comprises a material receiving conveying belt and a detection conveying belt which are vertically arranged at an interval, a detection camera and a material pressing plate are further arranged above the detection conveying belt, and through lifting of the material pressing plate, the material pressing plate downwards presses the detection conveying belt or upwards lifts away from the detection conveying belt. Compared with the prior art, the online sampling and detecting device has the advantages that online sampling and detecting of cut tobacco shreds are achieved, and the sampling and detecting precision and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment for cigarette production, in particular to an online sampling and detection device for cut tobacco. Background Art

[0002] Cut width refers to the width of the tobacco leaves formed by the cutter after the tobacco leaves are added. Cut width directly affects the intrinsic quality of the cigarette product. Controlling the quality and size of the cut tobacco is key to ensuring the consistency of the product's taste and appearance. Therefore, sampling and testing of cut tobacco is particularly important. The cut width pass rate is a key indicator in the quality management evaluation of the tobacco production line process. Tobacco with an appropriate width has better filling capacity, resulting in a fuller and smoother cigarette. However, uneven cut width will result in a lower whole tobacco rate and an increased broken tobacco rate, which will also increase cigarette consumption.

[0003] When measuring the cut width, it is necessary to first sample the cut tobacco after it has been cut by the cutter, and then perform a width test. At present, the method of sampling cut tobacco is generally manual sampling followed by offline detection of the cut width, that is, the inspector randomly grabs about 50 grams of cut tobacco samples at the cutter outlet and places them in a sample box, and then sends the sample box into the inspection room, randomly selects 150-200 tobacco leaves from the sample box and measures the leaf width in accordance with the requirements of the "Cigarette Process Specifications". The defects of this method of manual sampling and offline testing are: online sampling and testing cannot be achieved, the accuracy and efficiency of sampling and testing are low, and it is difficult to ensure the purity and integrity of the sampled samples. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an on-line sampling and detection device for cut tobacco, so as to realize on-line sampling and detection of cut tobacco and improve the accuracy and efficiency of sampling and detection of cut tobacco.

[0005] The utility model is realized through the following technical solutions:

[0006] An online sampling and detection device for cut tobacco comprises a frame, on which a grabbing mechanism and a detection mechanism are provided, wherein the grabbing mechanism is located above the detection mechanism;

[0007] The grabbing mechanism includes a base, the top of which is suspended on the top of the frame and can move along the front-to-back and vertical directions of the frame; a grabbing plate that can move vertically is provided on the base, and a plurality of grabbing hooks are provided at the bottom of the grabbing plate, and the claws at the bottom of the plurality of grabbing hooks extend toward the rear. The grabbing plate is driven to rise and fall vertically by a first driving mechanism, so that the plurality of grabbing hooks at the bottom of the grabbing plate are retracted upward into the base or extended downward from below the base; a blowing assembly is provided on the front side of the bottom of the base, and positive pressure air is sprayed through the blowing port of the blowing assembly, thereby blowing the tobacco shreds hung on the plurality of grabbing hooks of the grabbing plate backward;

[0008] The detection mechanism includes a material receiving conveyor belt and a detection conveyor belt arranged at intervals above and below. The conveying directions of the two conveyor belts are both in the front-to-back direction. The material receiving conveyor belt is used to receive the tobacco grabbed by the grabbing mechanism, and the detection conveyor belt is used to receive the tobacco falling from the material receiving conveyor belt. A detection camera and a pressing plate are also provided above the detection conveyor belt. The pressing plate is arranged across the detection conveyor belt and is located on one side of the material receiving conveyor belt. The pressing plate is driven up and down by the pressing drive mechanism, so that the pressing plate is pressed downward toward the detection conveyor belt or lifted upward away from the detection conveyor belt.

[0009] As a preferred embodiment of the above-mentioned device, a guide cavity for guiding the vertical sliding of the grabbing plate is opened on the base, a mounting plate is provided above the base, the first driving mechanism is a first cylinder, the cylinder body of the first cylinder is installed at the bottom of the mounting plate, the piston rod of the first cylinder extends vertically downward and is connected to the top of the grabbing plate, and the grabbing plate is driven to rise and fall vertically by the first cylinder.

[0010] As a preferred solution of the above-mentioned device, a linear guide rail extending forward and backward is provided on the top of the frame, a mounting back plate is provided at the bottom of the slider of the linear guide rail, a second cylinder is mounted on the mounting back plate, the piston rod of the second cylinder extends vertically downward and is connected to an elastic bracket, and the mounting plate on the top of the base is connected to the bottom of the elastic bracket.

[0011] As a preferred solution of the above-mentioned device, the elastic bracket includes an upper and lower bracket plate, which are connected by at least two bolts. Each bolt passes through the two bracket plates at the same time and is screwed with a nut to achieve a locking connection between the two bracket plates. Each bolt is equipped with a spring, which is located between the two bracket plates. The top of the upper bracket plate is connected to the piston rod of the second cylinder, and the bottom of the lower bracket plate is connected to the mounting plate.

[0012] As a preferred solution of the above-mentioned device, a mounting panel is provided on the mounting back plate, two guide sleeves are provided inside the mounting panel, two guide shafts are provided on the top of the elastic bracket, the two guide shafts are arranged on both sides of the second cylinder, and the two guide shafts are respectively slidably matched with the two guide sleeves.

[0013] As a preferred embodiment of the above-mentioned device, the outer cover of the discharge end of the material receiving conveyor belt is provided with a protective cover, which is fixed on the frame, and a material discharging roller is rotatably arranged inside the protective cover, and the material discharging roller is located below the discharge end of the material receiving conveyor belt and above the detection conveyor belt, and the pressing plate and the material discharging roller are arranged on both sides of the material receiving conveyor belt in the front and rear directions.

[0014] As a preferred solution of the above-mentioned device, the detection camera is located below the material receiving conveyor belt, and material receiving conveyor side plates are respectively provided on the left and right sides of the material receiving conveyor belt. The detection camera is installed on the detection beam, and the left and right ends of the detection beam are respectively installed on the material receiving conveyor side plates on the left and right sides of the material receiving conveyor belt.

[0015] As a preferred solution of the above-mentioned device, the pressing drive mechanism includes two third cylinders, and mounting brackets are respectively provided on the frame at the left and right sides of the pressing plate. The two third cylinders are respectively mounted on the two mounting brackets, and the piston rods of the two third cylinders extend vertically and are respectively connected to the left and right ends of the pressing plate, and the pressing plate is driven to move vertically at the same time by the two third cylinders.

[0016] As a preferred embodiment of the above-mentioned device, the blowing assembly includes two blowing blocks arranged side by side on the left and right. The blowing blocks are hollow and flat. The internal cavity of the blowing blocks forms a blowing channel. The blowing channel is a channel with a narrowed front end and an open rear end. The front end of the blowing channel of the blowing block is connected to an air pipe, and an air valve is provided on the air pipe to connect to an external air source through the air pipe.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The utility model provides an online sampling and detection device for cut tobacco, which realizes online sampling and detection of cut tobacco through the provision of a grabbing mechanism and a detection mechanism. The entire process is automated, ensuring the purity and integrity of the sampled samples, and guaranteeing the efficiency and accuracy of sampling and detection.

[0019] 2. The utility model provides an online sampling and detection device for cut tobacco. In its grabbing mechanism, a plurality of grabbing hooks with the same direction are arranged at the bottom of the grabbing plate as grabbing components. The grabbing component is driven to rise and fall slightly by the first cylinder, so that the plurality of grabbing hooks at the bottom of the grabbing plate can be retracted upward into the base or extended downward from under the base, thereby realizing rapid switching between the two states of sampling and not sampling; in conjunction with the linear guide rail and the second cylinder, the overall lifting and forward and backward movement of the grabbing mechanism are realized, thereby realizing automatic sampling from the discharge vibration trough at the discharge end of the cutter; in conjunction with the setting of the blowing component, the sampled tobacco on the grabbing component is automatically detached and falls onto the detection mechanism, thereby realizing automatic connection between the grabbing mechanism and the detection mechanism, and ensuring automatic transition from the two processes of sampling and detection.

[0020] 3. The utility model provides an online sampling and detection device for cut tobacco, whose detection mechanism includes a material receiving conveyor belt and a detection conveyor belt arranged at intervals above and below. The material receiving conveyor belt receives the tobacco grabbed from the grabbing mechanism, and the material is loosened and shifted by the material shifting roller between the two conveyor belts to avoid the tobacco clumping and affecting the accuracy of subsequent measurement results; the material pressing plate that can be raised and lowered on the detection conveyor belt is used to press the cut tobacco on the detection conveyor belt, thereby adjusting the posture of the cut tobacco, so that the cut tobacco on the detection conveyor belt is in a flat state, so that the pictures taken by the detection camera later measure the width of the cut tobacco, further ensuring the accuracy of the measurement results, and avoiding the influence of the accuracy of subsequent detection results due to the cut tobacco being in a vertical or skewed state when shooting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model.

[0022] Figure 2 It is a three-dimensional diagram of the overall structure of the utility model from another perspective.

[0023] Figure 3 It is a side view of the overall structure of the utility model.

[0024] Figure 4 It is a three-dimensional diagram of the grabbing mechanism of the present utility model.

[0025] Numbers in the figure: 1 frame, 2 grabbing mechanism, 3 detection mechanism, 4 base, 5 grabbing plate, 6 grabbing hook, 7 mounting plate, 8 first cylinder, 9 blowing block, 10 blowing channel, 11 air pipe, 12 air valve, 13 linear guide, 14 mounting back plate, 15 second cylinder, 16 mounting enclosure, 17 guide shaft, 18 spring, 19 upper support plate, 20 lower support plate, 21 material receiving conveyor belt, 22 detection conveyor belt, 23 detection camera, 24 pressing plate, 25 third cylinder, 26 mounting bracket, 27 material receiving conveyor side plate, 28 detection beam, 29 protective cover, 30 feeding roller, 31 support foot. DETAILED DESCRIPTION

[0026] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.

[0027] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.

[0028] See also Figures 1 to 4 The embodiment provides an online sampling and detection device for cut tobacco, comprising a frame 1 , on which a grabbing mechanism 2 and a detection mechanism 3 are provided, wherein the grabbing mechanism 2 is located above the detection mechanism 3 .

[0029] The grabbing mechanism 2 includes a base 4, the top of which is suspended on the top of the frame 1 and can move along the front and rear directions and vertical directions of the frame 1. A grabbing plate 5 that can move vertically is provided on the base 4, and a plurality of grabbing hooks 6 are provided at the bottom of the grabbing plate 5. The claws at the bottom of the plurality of grabbing hooks 6 extend toward the rear. The grabbing plate 5 is driven to rise and fall vertically by the first driving mechanism, so that the plurality of grabbing hooks 6 at the bottom of the grabbing plate 5 are retracted upward into the base 4 or extended downward from under the base 4; a guide cavity is opened on the base 4 to guide the vertical sliding of the grabbing plate 5, and a mounting plate 7 is provided above the base 4. The first driving mechanism is a first cylinder 8, and the cylinder body of the first cylinder 8 is installed at the bottom of the mounting plate 7. The piston rod of the first cylinder 8 extends vertically downward and is connected to the top of the grabbing plate 5, and the grabbing plate 5 is driven to rise and fall vertically by the first cylinder 8.

[0030] A blowing assembly is provided at the front side of the bottom of the base 4. Positive pressure air is ejected through the blowing port of the blowing assembly, thereby blowing the tobacco shreds hanging on the multiple grab hooks 6 of the grab plate 5 backward. The blowing assembly includes two blowing blocks 9 arranged side by side on the left and right. The blowing blocks 9 are hollow and flat. The internal cavity of the blowing blocks 9 forms a blowing channel 10. The blowing channel 10 is a channel with a narrowed front end and an open rear end. The front end of the blowing channel 10 of the blowing block 9 is connected to an air pipe 11. An air valve 12 is provided on the air pipe 11, and an external air source is connected through the air pipe 11.

[0031] A linear guide 13 extending forward and backward is installed at the top of the frame 1. The bottom of the slider of linear guide 13 is equipped with a mounting backplate 14. A second cylinder 15 is mounted on mounting backplate 14. The piston rod of second cylinder 15 extends vertically downward and is connected to an elastic bracket. The mounting plate 7 at the top of base 4 is connected to the bottom of the elastic bracket. A mounting panel 16 is installed on mounting backplate 14. Two guide sleeves are installed inside mounting panel 16. Two guide shafts 17 are installed at the top of the elastic bracket. These two guide shafts 17 are arranged on either side of second cylinder 15 and slide in conjunction with two guide sleeves, respectively, to guide the vertical movement of base 4.

[0032] The elastic bracket comprises two upper and lower bracket plates, connected by at least two bolts. Each bolt passes through both plates and is screwed onto a nut to lock the two plates together. Each bolt is fitted with a spring 18, which is located between the two plates. The top of the upper bracket plate 19 is connected to the piston rod of the second cylinder 15, while the bottom of the lower bracket plate 20 is connected to the mounting plate 7. During the sampling process, the vibrating discharge trough at the discharge end of the shredder can interfere with or even damage the sampling components. The provision of the elastic bracket acts as an elastic buffer for the sampling components during the sampling process, effectively protecting them from damage.

[0033] The detection mechanism 3 includes a receiving conveyor belt 21 and a detection conveyor belt 22 which are spaced apart above and below. The conveying directions of the two conveyor belts are both in the front-to-back direction. The receiving conveyor belt 21 is used to receive the tobacco grabbed by the grabbing mechanism 2, and the detection conveyor belt 22 is used to receive the tobacco falling from the receiving conveyor belt 21. A detection camera 23 and a pressing plate 24 are also provided above the detection conveyor belt 22. The pressing plate 24 is arranged across the detection conveyor belt 22 and is located on one side of the receiving conveyor belt 21. The pressing plate 24 is driven to move upward by the pressing drive mechanism, so that the pressing plate 24 is pressed downward toward the detection conveyor belt 22 or lifted upward away from the detection conveyor belt 22. The pressing drive mechanism includes two third cylinders 25. The frame 1 is provided with mounting brackets 26 at the positions on the left and right sides of the pressing plate 24. The two third cylinders 25 are respectively mounted on the two mounting brackets 26. The piston rods of the two third cylinders 25 extend vertically and are respectively connected to the left and right ends of the pressing plate 24, and the pressing plate 24 is driven vertically by the two third cylinders 25 at the same time. The detection camera 23 is located below the material receiving conveyor belt 21. The material receiving conveyor belt 21 is provided with a material receiving conveyor side plate 27 on the left and right sides. The detection camera 23 is installed on the detection beam 28. The left and right ends of the detection beam 28 are respectively installed on the material receiving conveyor side plates 27 on the left and right sides of the material receiving conveyor belt 21.

[0034] The outer cover of the discharge end of the material receiving conveyor belt 21 is provided with a protective cover 29, which is fixed on the frame 1, and a material discharging roller 30 is rotatably arranged inside the protective cover 29. The material discharging roller 30 is located below the discharge end of the material receiving conveyor belt 21 and above the detection conveyor belt 22. The pressing plate 24 and the material discharging roller 30 are arranged on both sides of the material receiving conveyor belt 21 in the front and rear directions.

[0035] During operation, the device is installed on both sides of the discharge trough on the discharge side of the shredder, and supported on the ground by the four legs 31 at the bottom of the frame 1, so that the detection mechanism 3 is located directly above the discharge trough. The linear guide 13 is activated, driving the grabbing mechanism 2 to move from back to front, so that the grabbing mechanism 2 is directly above the discharge trough, and then the second cylinder 15 is activated, driving the grabbing mechanism 2 to descend close to the discharge trough, and then the first cylinder 8 is activated, driving the grabbing plate 5 to move downward and extend downward to under the base 4, so that the multiple grabbing hooks 6 at the bottom of the grabbing plate 5 are inserted into the cut tobacco conveyed on the discharge trough. The cut tobacco moves with the vibration of the discharge trough and is hooked on the claws of the multiple grabbing hooks 6 for sampling. Then the second cylinder 15 is activated, driving the grabbing mechanism 2 to lift away from the discharging vibration trough and above the detection mechanism 3, and the linear guide 13 is activated, driving the grabbing mechanism 2 to move from front to back and to the top of the material receiving conveyor belt 21, and then the blowing assembly is started, and the air valves 12 corresponding to the two blowing blocks 9 are opened, and the positive pressure air source is connected, and positive pressure air is blown backward from the blowing channels 10 of the two blowing blocks 9, thereby blowing the tobacco shreds hung on the multiple grabbing hooks 6 at the bottom of the grabbing plate 5 backward and falling onto the material receiving conveyor belt 21 below, and then the first cylinder 8 is activated to drive the grabbing plate 5 to retract into the base 4 for the next sampling. As the material receiving conveyor belt 21 runs, the tobacco shreds that fall onto the material receiving conveyor belt 21 fall from the discharge end of the material receiving conveyor belt 21, and after being loosened by the material stripping roller 30, fall onto the detection conveyor belt 22 below. The detection conveyor belt 22 rotates forward, and conveys the tobacco shreds thereon toward the pressing plate 24. When the tobacco shreds reach below the pressing plate 24, the two third cylinders 25 are actuated to drive the pressing plate 24 to press down the cut tobacco shreds on the detection conveyor belt 22, so that the cut tobacco shreds are in a flat state on the detection conveyor belt 22. Then the two third cylinders 25 are actuated to drive the pressing plate 24 to lift off the detection conveyor belt 22. After that, the detection conveyor belt 22 is reversed, and the cut tobacco shreds that have passed through the pressing are conveyed in the opposite direction. During this process, the cut tobacco shreds that have passed through the pressing are photographed by the detection camera 23 to obtain an image of the cut tobacco shreds in a flat state. The width of the cut tobacco shreds can then be accurately measured based on the obtained image. At this point, the online sampling and testing of the cut tobacco is completed, and the whole process is automated, which greatly improves the efficiency and accuracy of sampling and testing.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements 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 online sampling and detection device for cut tobacco, characterized by: The invention comprises a frame (1), wherein a gripping mechanism (2) and a detection mechanism (3) are provided on the frame (1), and the gripping mechanism (2) is located above the detection mechanism (3); The grabbing mechanism (2) comprises a base (4), the top of the base (4) is suspended on the top of the frame (1) and can move along the front-back direction and the vertical direction of the frame (1), a grabbing plate (5) that can move vertically is provided on the base (4), a plurality of grabbing hooks (6) are provided at the bottom of the grabbing plate (5), the claws at the bottom of the plurality of grabbing hooks (6) extend toward the rear, and the grabbing plate (5) is driven to rise and fall vertically by a first driving mechanism, so that the plurality of grabbing hooks (6) at the bottom of the grabbing plate (5) are retracted upward into the base (4) or extended downward below the base (4); a blowing assembly is provided at the front side of the bottom of the base (4), and positive pressure air is sprayed through the blowing port of the blowing assembly, thereby blowing the tobacco shreds hung on the plurality of grabbing hooks (6) of the grabbing plate (5) backward; The detection mechanism (3) comprises a material receiving conveyor belt (21) and a detection conveyor belt (22) which are arranged at intervals above and below. The conveying directions of the two conveyor belts are both in the front-to-back direction. The material receiving conveyor belt (21) is used to receive the tobacco shreds grabbed by the grabbing mechanism (2), and the detection conveyor belt (22) is used to receive the tobacco shreds dropped from the material receiving conveyor belt (21). A detection camera (23) and a pressing plate (24) are also provided above the detection conveyor belt (22). The pressing plate (24) is arranged across the detection conveyor belt (22) and is located on one side of the material receiving conveyor belt (21). The pressing plate (24) is driven to rise and fall by the pressing drive mechanism so that the pressing plate (24) is pressed downward toward the detection conveyor belt (22) or lifted upward away from the detection conveyor belt (22).

2. The on-line sampling and detection device for cut tobacco according to claim 1, characterized in that: The base (4) is provided with a guide cavity for guiding the vertical sliding of the grabbing plate (5); a mounting plate (7) is provided above the base (4); the first driving mechanism is a first cylinder (8); the cylinder body of the first cylinder (8) is mounted on the bottom of the mounting plate (7); the piston rod of the first cylinder (8) extends vertically downward and is connected to the top of the grabbing plate (5); and the grabbing plate (5) is driven to rise and fall vertically by the first cylinder (8).

3. The on-line sampling and detection device for cut tobacco according to claim 2, characterized in that: A linear guide rail (13) extending forward and backward is provided on the top of the frame (1), a mounting back plate (14) is provided at the bottom of the slider of the linear guide rail (13), a second cylinder (15) is mounted on the mounting back plate (14), a piston rod of the second cylinder (15) extends vertically downward and is connected to an elastic bracket, and a mounting plate (7) on the top of the base (4) is connected to the bottom of the elastic bracket.

4. The on-line sampling and detection device for cut tobacco according to claim 3, characterized in that: The elastic bracket comprises an upper and lower bracket plate, the two bracket plates are connected by at least two bolts, each bolt passes through the two bracket plates at the same time and is screwed with a nut to achieve a locking connection between the two bracket plates, each bolt is provided with a spring (18), the spring (18) is located between the two bracket plates, the top of the upper bracket plate (19) is connected to the piston rod of the second cylinder (15), and the bottom of the lower bracket plate (20) is connected to the mounting plate (7).

5. The on-line sampling and detection device for cut tobacco according to claim 3, characterized in that: The mounting back plate (14) is provided with a mounting panel (16), two guide sleeves are provided inside the mounting panel (16), and two guide shafts (17) are provided on the top of the elastic bracket. The two guide shafts (17) are arranged on both sides of the second cylinder (15), and the two guide shafts (17) are respectively slidably matched with the two guide sleeves.

6. The on-line sampling and detection device for cut tobacco according to claim 1, characterized in that: The outer cover of the discharge end of the material receiving conveyor belt (21) is provided with a protective cover (29), which is fixed on the frame (1), and a material-discharging roller (30) is rotatably provided in the protective cover (29), and the material-discharging roller (30) is located below the discharge end of the material receiving conveyor belt (21) and above the detection conveyor belt (22), and the pressing plate (24) and the material-discharging roller (30) are arranged on both sides of the material receiving conveyor belt (21) in the front-rear direction.

7. The on-line sampling and detection device for cut tobacco according to claim 1, characterized in that: The detection camera (23) is located below the material receiving conveyor belt (21), and the left and right sides of the material receiving conveyor belt (21) are respectively provided with material receiving conveying side plates (27). The detection camera (23) is installed on the detection beam (28), and the left and right ends of the detection beam (28) are respectively installed on the material receiving conveying side plates (27) on the left and right sides of the material receiving conveyor belt (21).

8. The on-line sampling and detection device for cut tobacco according to claim 1, characterized in that: The pressing drive mechanism comprises two third cylinders (25). Mounting brackets (26) are respectively provided on the frame (1) at positions on the left and right sides of the pressing plate (24). The two third cylinders (25) are respectively mounted on the two mounting brackets (26). The piston rods of the two third cylinders (25) extend vertically and are respectively connected to the left and right ends of the pressing plate (24). The pressing plate (24) is driven to move vertically simultaneously by the two third cylinders (25).

9. The on-line sampling and detection device for cut tobacco according to claim 1, characterized in that: The blowing assembly comprises two blowing blocks (9) arranged side by side on the left and right. The blowing blocks (9) are hollow and flat. The internal cavity of the blowing blocks (9) forms a blowing channel (10). The blowing channel (10) is a channel with a narrowed front end and an open rear end. The front end of the blowing channel (10) of the blowing block (9) is connected to an air pipe (11). An air valve (12) is provided on the air pipe (11), and an external air source is connected through the air pipe (11).

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