Constant flow control and material level detection device for tobacco shred conveying

Abstract

The utility model discloses a constant flow control and material level detection device for tobacco shred conveying. The constant flow control and material level detection device comprises a protective frame, a signal line, a photoelectric tube, an air tube, a positioning strip, a lifting belt conveyor, a hopper, a metering tube and an electronic belt scale. An electronic belt scale is arranged right below the metering tube, a hopper and a lifting belt conveyor are arranged right above the metering tube, a plurality of groups of photoelectric tubes are symmetrically arranged on the left side and the right side of the metering tube respectively and are used for detecting the tobacco shred material level in the metering tube respectively, and signals are sent out through a signal line to control the tobacco shred input time of the lifting belt conveyor to the hopper and the output of the lifting belt conveyor to the electronic belt scale. The high-pressure gas in the gas pipe is sprayed to the photoelectric tube in the protective frame in real time, so that the photoelectric tube is in a clean working environment for a long time, the problems of photoelectric signal distortion and the like are solved, a production line runs stably, the production efficiency is improved, and the maintenance cost is reduced. According to the utility model, the cut tobacco material can be conveyed to the downstream process at a relatively constant flow, the flow fluctuation is reduced to meet the cut tobacco making process requirement, and the cut tobacco making quality is improved.

Description

Technical Field

[0001] The utility model belongs to the field of tobacco, relates to cigarette production technology, and particularly relates to a constant flow control and material level detection device for tobacco shred conveying. Background Art

[0002] In tobacco shred production lines, tobacco material is delivered to downstream processes at a constant, uniform, and quantitative flow rate to minimize fluctuations in material flow, meet downstream equipment processing parameters, and improve shred quality. This critical process typically requires the coordinated collaboration of electronic belt scales, metering tubes, and through-beam photoelectric level detection devices, with level measurement being the key technical element.

[0003] The through-beam photoelectric tube level detector is a highly sensitive photoelectric detection switch. It issues commands to control the elevator conveyor, which feeds tobacco into the metering tube. The photoelectric tube level detector then measures the tobacco level within the metering tube. Obviously, as a device designed based on photoelectric theory, the photoelectric tube level detector has very stringent environmental requirements, such as humidity and dust. Therefore, the photoelectric tube level detector should not directly contact the tobacco to perform tobacco level detection. Otherwise, the moisture and dust in the tobacco will adhere to the optical glass, rendering it ineffective.

[0004] Cut tobacco, particularly cut stems, is derived from tobacco stems from the redrying process. These stems carry a significant amount of stem debris and dust, so cut stems made from this raw material often contain a high level of dust, debris, or tobacco dust. Therefore, to accurately measure the cut tobacco level, a rectangular metering tube is typically constructed of transparent materials such as plexiglass. Photoelectric level detection devices are then installed on both sides of the metering tube, indirectly measuring the cut tobacco level through the plexiglass. Obviously, this method ensures that the photoelectric tube material level detection device is not contaminated by moisture, ash, and cigarette dust in the tobacco, and is effective. To achieve this goal, the general technology is to regularly clean the moisture and ash and cigarette dust on the inner wall of the metering tube, either by using a dedicated person to complete the cleaning or by designing an automatic scraping device. Otherwise, the photoelectric tube material level detection device will not be able to detect the material level and will send an error signal, either pausing the production line or causing equipment failure. Statistics show that the number of times the photoelectric tube is contaminated, resulting in photoelectric signal distortion, can reach an average of 6 times a day, causing the production line to be suspended an average of 2 times a day. Therefore, the commonly used constant flow control method and material level detection technology for tobacco conveying are high in maintenance cost and cumbersome. In particular, cleaning the dirt on the photoelectric tube is difficult and requires high technical requirements.

[0005] In response to the above problems, in order to solve the key technology of material level measurement, after research, the best method should be to ensure that the photoelectric tube material level detection device is in a relatively clean working environment for a long time and to ensure that the photoelectric detection signal is not distorted.

[0006] To sum up, in the tobacco silk production line, it is possible to connect the upstream and downstream processes with a constant flow of tobacco materials, improve the quality of silk production, and study the constant flow control and material level detection devices for tobacco transportation, which can improve production efficiency and reduce maintenance costs. It has broad application prospects in the tobacco industry.

[0007] In order to solve the above problems, the present utility model is proposed. Utility Model Content

[0008] The purpose of the utility model is to address the deficiencies of the existing technology and provide a constant flow control and material level detection device and method for tobacco conveying. The utility model has a plurality of photoelectric tubes symmetrically arranged on the left and right sides of the metering tube of the device, which respectively detect the tobacco material level in the metering tube and send signals through the signal line to control the tobacco input timing of the lifting belt conveyor to the hopper and the output to the electronic belt scale; the high-pressure gas in the air pipe is sprayed to the photoelectric tube in the protective frame in real time, so that the photoelectric tube is kept in a clean working environment for a long time, and the problem of photoelectric signal distortion is solved, so that the production line can run stably, the production efficiency is improved and the maintenance cost is reduced; the utility model can transport the tobacco material to the downstream process at a relatively constant flow rate, reduce the flow fluctuation to meet the requirements of the silk making process, and improve the silk making quality.

[0009] In order to solve the above problems, the first aspect of the present invention provides a constant flow control and material level detection device for tobacco conveying, which includes a protective frame 1, a signal line 2, a photoelectric tube 3, an air pipe 4, a positioning bar 5, a lifting belt conveyor 6, a hopper 7, a metering tube 8, and an electronic belt scale 9;

[0010] The electronic belt scale 9 is provided directly below the metering tube 8, and the hopper 7 is provided directly above the metering tube 8. The hopper 7 is located downstream of the lifting belt conveyor 6, and the tobacco is input into the hopper 7 by the lifting belt conveyor 6. Here, the downstream is defined by the movement direction of the tobacco material, and the tobacco moves from upstream to downstream.

[0011] Multiple groups of photoelectric tubes 3 are symmetrically arranged at different heights on the left and right sides of the metering tube 8;

[0012] The metering tube 8 has a photoelectric through hole 8-1, and the center of the photoelectric through hole 8-1 is collinear with the axis of the photoelectric tube 3;

[0013] The photoelectric tube 3 is installed in the protective frame 1, and the protective frame 1 and the positioning bar 5 are fixedly connected;

[0014] The gas in the gas pipe 4 is connected to the protective frame 1, and the high-pressure gas in the gas pipe 4 is sprayed on the photoelectric tube 3 in real time;

[0015] The signal line 2 is connected to the photoelectric tube 3, and the photoelectric tube 3 detects the tobacco material level in the metering tube 8 and sends a signal through the signal line 2 to control the tobacco input state of the lifting belt conveyor 6 to the hopper 7 and the output to the electronic belt scale 9.

[0016] Preferably, the hopper 7 adopts a through trapezoidal structure and is connected to the metering pipe 8;

[0017] The protective frame 1 is a trapezoidal structure with a hollow interior and an open side. The air pipe 4 is connected to the protective frame 1 via an air pipe joint 4-1, and the connection is fixed by a third nut 4-2.

[0018] The protective frame 1 has a through hole 1-1, and the positioning bar 5 has a bolt 5-1, a first nut 5-2, a screw 5-3, and a second nut 5-4. The protective frame 1 is fixedly connected to the positioning bar 5 through the through hole 1-1 and the screw 5-3, and the connection is clamped and fixed by the second nut 5-4;

[0019] After the guard frame 1 and the positioning bar 5 are fixedly connected, the guard frame 1 and the positioning bar 5 are mounted and fixed on the equipment rack on the production line using the bolts 5 - 1 and the first nuts 5 - 2 .

[0020] Preferably, three groups of photoelectric tubes 3 are symmetrically arranged at different heights on the left and right sides of the metering tube 8, namely the first photoelectric tube 3a, the second photoelectric tube 3b and the third photoelectric tube 3c. Correspondingly, the protective frame 1 is 3 groups, the signal line 2 is 3 groups, and the photoelectric through hole 8-1 is 3 groups.

[0021] Preferably, the metering tube 8 is a rectangular structure with a through hole, with a length and width of L×B and a height of H. The first phototube 3a is arranged on both sides of the metering tube 8 at a height of h1 from the bottom of the metering tube 8, the second phototube 3b is arranged at a height of h2 from the first phototube 3a, the third phototube 3c is arranged at a height of h3 from the second phototube 3b, and the bottom of the metering tube 8 is located at a distance of h0 from the belt plane of the electronic belt scale 9.

[0022] Preferably, L×B=620mm×200mm, H=1000mm, h0 is adjustable, h0=80-150mm, h1=220mm, h2=280mm, h3=200mm.

[0023] Preferably, the photoelectric tube 3 is a through-beam photoelectric sensor;

[0024] The metering tube 8 is made of organic glass, and the aperture of the photoelectric through hole 8 - 1 matches the aperture of the light wave emitted by the photoelectric tube 3 .

[0025] The second aspect of the present invention provides a method for constant flow control and material level detection of tobacco conveying, which uses the constant flow control and material level detection device for tobacco conveying described in the first aspect of the present invention. The constant flow control and material level detection method for tobacco conveying includes: tobacco is input into the hopper 7 by the lifting belt conveyor 6, the tobacco material level in the metering tube 8 is detected by the photoelectric tube 3, and a signal is sent through the signal line 2 to control the input time of tobacco to the hopper 7 by the lifting belt conveyor 6 and the output to the electronic belt scale 9.

[0026] Preferably, three groups of photoelectric tubes 3 are symmetrically arranged at different heights on the left and right sides of the metering tube 8, namely a first photoelectric tube 3a, a second photoelectric tube 3b and a third photoelectric tube 3c;

[0027] When any one of the first photoelectric tube 3a, the second photoelectric tube 3b and the third photoelectric tube 3c detects the tobacco material level, a command is issued through the corresponding signal line 2 to make the electronic belt scale 9 transport the tobacco to the next process.

[0028] Preferably, when the third photoelectric tube 3 c detects the height of the tobacco shreds, an instruction is sent through the corresponding signal line 2 to cause the lifting belt conveyor 6 to stop conveying the tobacco shreds to the hopper 7 .

[0029] Preferably, when the second photoelectric tube 3b detects the height of the tobacco material level, an instruction is issued through the corresponding signal line 2 to reduce or halve the flow rate or speed of the tobacco conveyed by the lifting belt conveyor 6 to the hopper 7.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. This utility model features a constant flow control and material level detection device for tobacco conveying. Multiple photoelectric tubes are symmetrically positioned on either side of a metering tube, each detecting the tobacco material level within the metering tube. Signals are then sent via signal lines to control the timing of tobacco feed from the elevating belt conveyor to the hopper and the output to the electronic belt scale. This embodiment, for tobacco stem shreds, connects the process of adding flavoring sugar and the process of drying the tobacco stems. Through the electronic belt scale 9, the tobacco stem shreds are uniformly and quantitatively delivered to the drying machine at a relatively constant flow rate. This ensures that the tobacco shreds are delivered to downstream processes at a relatively constant flow rate, reducing flow fluctuations to meet the requirements of the tobacco production process, improving process efficiency, and enhancing tobacco production quality.

[0032] 2. Because tobacco stems have undergone the process of adding flavoring sugar, they contain high levels of moisture and sugar. Furthermore, tobacco stems contain a certain amount of tobacco dust or dust, which can easily contaminate the light wave emission port of the photoelectric tube, causing it to fail. In this utility model, symmetrical photoelectric holes are created on the left and right sides of metering tube 8 and installed with photoelectric tubes, effectively shielding this contamination and improving the physical performance of the photoelectric tubes. Furthermore, photoelectric tube 3 is placed within a protective frame, and high-pressure gas from air pipe 4 is blown through the photoelectric tube in real time. The airflow within the protective frame also prevents the tobacco material from overflowing from the photoelectric holes. Therefore, problems such as photoelectric signal distortion are effectively resolved, ensuring that the material level detection device of photoelectric tube 3 maintains a clean working environment at all times. This facilitates solving key technologies such as material level measurement, improves production efficiency, and reduces maintenance costs.

[0033] 3. The volume size of the rectangular metering tube of the present invention has been precisely calculated. Since the distance h0 between the bottom of the metering tube 8 and the belt plane of the electronic belt scale 9 is adjustable, the size of h0 is related to the flow rate of tobacco stems, and is monitored by the electronic belt scale. Therefore, it can effectively reduce the fluctuation range of the material flow input to the next process, so that it meets the process requirements and improves the process effect.

[0034] 4. The heights of the photoelectric tubes 3 are h1, h2, and h3. After production verification, the present invention symmetrically arranges three groups of photoelectric tubes 3. Its greatest beneficial effect is that any photoelectric tube can ensure the operation of the production line, improve production efficiency, and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] To better understand the above and other objects, features, advantages, and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. Like reference numerals in the accompanying drawings refer to like components. Those skilled in the art should understand that the accompanying drawings are intended to schematically illustrate preferred embodiments of the present invention and do not limit the scope of the present invention in any way, and that the components in the drawings are not drawn to scale.

[0036] In the attached figure:

[0037] Figure 1 This is a schematic diagram of the structural design of the constant flow control and material level detection device for tobacco conveying according to an embodiment of the present utility model;

[0038] Figure 2 This is a schematic diagram of the rectangular parallelepiped structure design of the metering tube in the embodiment of the present utility model;

[0039] Figure 3 This is a schematic diagram showing the position of the photoelectric tube through hole, the position of the metering tube and the electronic belt scale in the embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the assembly structure of the protective frame, signal line, photoelectric tube, and air tube in the embodiment of the utility model;

[0041] Figure 5 It is a schematic diagram of the installation design of the connecting parts of the positioning strip, the guard frame and the rack in the embodiment of the utility model.

[0042] The names of the figure marks in the figure description are: 1. protective frame; 1-1. through hole; 2. signal line; 3. photoelectric tube; 3a. first photoelectric tube; 3b. second photoelectric tube; 3c. third photoelectric tube; 4. air pipe; 4-1. air pipe joint; 4-2. third nut; 5. positioning bar; 5-1. bolt; 5-2. first nut; 5-3. screw; 5-4. second nut; 6. lifting belt conveyor; 7. hopper; 8. metering tube; 8-1. photoelectric through hole; 9. electronic belt scale. DETAILED DESCRIPTION

[0043] The following, in conjunction with the accompanying drawings, provides a more detailed description of the above-mentioned and other technical features and advantages of the present invention. In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, unless otherwise specifically defined.

[0044] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0046] In order to solve the above problems, the utility model provides a constant flow control and material level detection device for tobacco conveying, comprising a protective frame 1, a signal line 2, a photoelectric tube 3, an air pipe 4, a positioning bar 5, a bolt 5-1, a lifting belt conveyor 6, a hopper 7, a metering tube 8, a photoelectric through hole 8-1, an electronic belt scale 9, etc.

[0047] An electronic belt scale 9 is provided just below the metering tube 8, and a hopper 7 is provided just above the metering tube 8. The hopper 7 is located downstream of the lifting belt conveyor 6, and the tobacco is fed into the hopper 7 by the lifting belt conveyor 6.

[0048] Three groups of photoelectric tubes 3 (a first photoelectric tube 3a, a second photoelectric tube 3b and a third photoelectric tube 3c) are symmetrically arranged at different heights on the left and right sides of the metering tube 8;

[0049] The metering tube 8 has a photoelectric through hole 8-1, and the center of the photoelectric through hole 8-1 is collinear with the axis of the photoelectric tube;

[0050] The first photoelectric tube 3a, the second photoelectric tube 3b and the third photoelectric tube 3c are respectively installed in the protective frame 1. The protective frame 1 and the positioning bar 5 are connected by screws. The positioning bar 5 has a bolt 5-1 and is fixed to the equipment rack on the production line by the bolt 5-1.

[0051] The signal line 2 is connected to the photoelectric tube 3. The first photoelectric tube 3a, the second photoelectric tube 3b and the third photoelectric tube 3c respectively detect the tobacco material level in the metering tube 8 and send signals through the signal line 2 to control the state of tobacco input from the lifting belt conveyor 6 to the hopper 7.

[0052] The gas in the air pipe 4 is connected to the inside of the protective frame 1, and the high-pressure gas in the air pipe 4 sprays the first phototube 3a, the second phototube 3b and the third phototube 3c in real time; corresponding to the three groups of phototubes 3, the protective frame 1 is 3 groups, the signal lines 2 are 3 groups, and the photoelectric through holes 8-1 are 3 groups.

[0053] See the figures.

[0054] The photoelectric tube in this embodiment uses a Pepperl+Fuchs photoelectric switch sensor, a through-beam type, for detecting tobacco material level. Because the photoelectric tube is a highly sensitive precision instrument, this technical solution design uses a protective frame and air injection to improve its working environment quality and ensure its reliable physical performance.

[0055] The hopper 7 adopts a through trapezoidal structure and is connected to the metering tube 8.

[0056] like Figure 2 、 3The metering tube 8 is a rectangular parallelepiped structure with a through hole, with a length and width of L×B and a height of H, preferably L×B=620×200 (mm) and H=1000mm. A first photoelectric tube 3a is provided on both sides of the metering tube 8 at a height h1 from the bottom of the metering tube 8, a second photoelectric tube 3b is provided at a height h2 from the first photoelectric tube 3a, and a third photoelectric tube 3c is provided at a height h3 from the second photoelectric tube 3b. The distance from the bottom of the metering tube 8 to the plane of the electronic belt scale 9 is h0, which is adjustable and ranges from 80 to 150 mm. Preferably, h1=220 mm, h2=280 mm, and h3=200 mm.

[0057] The metering tube 8 is made of organic glass, and the aperture of the photoelectric through hole 8-1 matches the aperture of the light wave emitted by the photoelectric tube.

[0058] like Figure 4 State.

[0059] The protective frame 1 is a trapezoidal structure with a hollow interior and an open side. The air pipe 4 is connected to the protective frame 1 through an air pipe joint 4-1, and the connection is fixed by a third nut 4-2.

[0060] like Figure 5 As described above, the guard frame 1 has a through hole 1-1, and the positioning bar 5 has a bolt 5-1, a first nut 5-2, a screw 5-3, and a second nut 5-4. The guard frame 1 is installed on the positioning bar 5 through the through hole 1-1. Use the screw 5-3 to install each guard frame 1 and clamp it with the second nut 5-4. After each guard frame 1 is installed on the positioning bar 5, Figure 5 As described above, it can be fixed on the equipment rack on the production line using the bolt 5-1 and the first nut 5-2.

[0061] The mounting hole positions on the positioning bar 5 are h2 = 280 mm and h3 = 200 mm, ensuring their manufacturing accuracy so that the center of the photoelectric through hole 8-1 is collinear with the axis of the photoelectric tube;

[0062] After the above installation is completed, connect each air pipe 4 to the workshop high-pressure air pipeline, and it can work normally; connect each signal line 2 to a logic controller, such as a PLC, and process the signals of the first photoelectric tube 3a, the second photoelectric tube 3b and the third photoelectric tube 3c respectively to control the time state or belt running speed of the lifting belt conveyor 6 and the electronic belt scale 9 respectively, and the following steps can be implemented.

[0063] The constant flow control and material level detection device for tobacco conveying of this embodiment is used, and the constant flow control and material level detection method for tobacco conveying includes: tobacco is input into the hopper 7 by the lifting belt conveyor 6, the tobacco material level in the metering tube 8 is detected by the photoelectric tube 3, and a signal is sent through the signal line 2 to control the input timing of tobacco to the hopper 7 by the lifting belt conveyor 6 and the output to the electronic belt scale 9.

[0064] Specifically, when any one of the first photoelectric tube 3a, the second photoelectric tube 3b and the third photoelectric tube 3c detects the height of the tobacco material level, a command is issued through the corresponding signal line 2 to make the electronic belt scale 9 transport the tobacco to the next process.

[0065] When the photoelectric tube 3 c detects the height of the tobacco shreds, a command is issued through the corresponding signal line 2 to cause the lifting belt conveyor 6 to stop conveying the tobacco shreds to the hopper 7 .

[0066] When the photoelectric tube 3b detects the height of the tobacco material level, a command is issued through the corresponding signal line 2 to reduce or halve the flow rate (or speed) of the tobacco conveyor 6 to the hopper 7.

[0067] The above steps are all alternating according to the working state. The above embodiment is for the process of connecting tobacco stem shreds and then entering the tobacco stem drying machine after adding the flavoring sugar material, with a production efficiency or flow rate of 3300-4100 kg / h.

[0068] The above are only preferred embodiments of the present invention and are intended to be illustrative rather than restrictive. The structures and connection methods of the components of the present invention are subject to change, and any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the scope of protection of the present invention.

Claims

1. A constant flow control and material level detection device for tobacco conveying, characterized in that: It includes a protective frame (1), a signal line (2), a photoelectric tube (3), an air pipe (4), a positioning bar (5), a lifting belt conveyor (6), a hopper (7), a metering tube (8), and an electronic belt scale (9); The electronic belt scale (9) is provided just below the metering tube (8), the hopper (7) is provided just above the metering tube (8), and the hopper (7) is located downstream of the lifting belt conveyor (6); A plurality of groups of photoelectric tubes (3) are symmetrically arranged at different heights on the left and right sides of the metering tube (8); The metering tube (8) has a photoelectric through hole (8-1), and the center of the photoelectric through hole (8-1) is collinear with the axis of the photoelectric tube (3); The photoelectric tube (3) is installed in the protective frame (1), and the protective frame (1) and the positioning bar (5) are fixedly connected; The gas in the air pipe (4) is connected to the inside of the protective frame (1), and the gas in the air pipe (4) is sprayed toward the photoelectric tube (3); The signal line (2) is connected to the photoelectric tube (3).

2. A constant flow control and material level detection device for tobacco conveying according to claim 1, characterized in that: The hopper (7) adopts a through trapezoidal structure and is connected to the metering pipe (8); The protective frame (1) is a trapezoidal structure with a hollow interior and an open side. The air pipe (4) is connected to the protective frame (1) via an air pipe joint (4-1), and the connection is fixed by a third nut (4-2). The protective frame (1) has a through hole (1-1), the positioning bar (5) has a bolt (5-1), a first nut (5-2), a screw (5-3), and a second nut (5-4); the protective frame (1) is fixedly connected to the positioning bar (5) through the through hole (1-1) and the screw (5-3), and the connection is clamped and fixed by the second nut (5-4); After the guard frame (1) and the positioning bar (5) are fixedly connected, the guard frame (1) and the positioning bar (5) are installed and fixed on the equipment rack on the production line using the bolts (5-1) and the first nuts (5-2).

3. The constant flow control and material level detection device for tobacco conveying according to claim 1, characterized in that: Three groups of photoelectric tubes (3) are symmetrically arranged at different heights on the left and right sides of the metering tube (8), namely a first photoelectric tube (3a), a second photoelectric tube (3b) and a third photoelectric tube (3c). Correspondingly, the protective frame (1) is provided in three groups, the signal line (2) is provided in three groups, and the photoelectric through hole (8-1) is provided in three groups.

4. A constant flow control and material level detection device for tobacco conveying according to claim 3, characterized in that: The metering tube (8) is a rectangular parallelepiped structure with a through hole, with a length and width of L×B and a height of H. The first photoelectric tube (3a) is arranged on both sides of the metering tube (8), and the height from the bottom of the metering tube (8) is h1, the height from the second photoelectric tube (3b) is h2, and the height from the third photoelectric tube (3c) to the second photoelectric tube (3b) is h3. The bottom of the metering tube (8) is located at a distance h0 from the belt plane of the electronic belt scale (9).

5. The device for constant flow control and material level detection of tobacco conveying according to claim 4, characterized in that: L×B=620mm×200mm,H=1000mm,h0 adjustable,h0=80~150mm,h1=220mm,h2=280mm, h 3=200mm.

6. The device for constant flow control and material level detection of tobacco conveying according to claim 1, characterized in that: The photoelectric tube (3) is a through-beam photoelectric sensor; The metering tube (8) is made of organic glass, and the aperture of the photoelectric through hole (8-1) matches the aperture of the light wave emitted by the photoelectric tube (3).

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