Double-layer bent pipe structure, pipeline section and material conveying pipeline

Abstract

The utility model relates to a double-layer bent pipe structure, a pipeline section and a material conveying pipeline, the double-layer bent pipe structure comprises a first inner pipe and a second inner pipe, the material conveying pipeline forms a conveying line combining a linear path and a turning path, and the linear path is at least partially composed of at least one set of second inner pipe and a second sheath. According to the double-layer bent pipe structure, the pipeline section and the material conveying pipeline, when materials such as tobacco shreds are pneumatically conveyed through the material conveying pipeline, the materials such as the tobacco shreds can be conveyed in the material conveying pipeline under the action of the pressure difference of the two ends of the material conveying pipeline; negative pressure is integrally formed in the material conveying pipeline relative to the outside, under the action of the first ventilation holes, the tobacco shreds are bent outwards at the turning position of the pipeline to be blown, impact friction between the tobacco shreds and the pipe wall at the turning position is effectively relieved, under the action of the second ventilation holes, when the tobacco shreds are linearly conveyed, the tobacco shreds and the pipe wall can generate a certain separation effect, and therefore the tobacco shreds are separated from the pipe wall. And meanwhile, the breakage rate of the tobacco shreds is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of material transportation, and in particular to a double-layer elbow structure, a pipeline section and a material transportation pipeline. Background Art

[0002] In the tobacco processing industry, the transportation of tobacco materials is a key process. Common tobacco transportation methods include conveyor belts, conveyors or free fall. Currently, pneumatic conveying is more widely used. This method creates a pressure difference at both ends of the pipeline, and the pipeline is at a negative pressure level relative to the outside of the pipeline, so that the tobacco materials are transported in the pipeline. Because this method has the advantages of high transportation efficiency, long transmission distance, flexible and beautiful pipeline layout, its application is becoming more and more extensive. However, pneumatic conveying also has certain defects in actual applications. For example, when the pipeline transports tobacco through the action of pressure difference, the friction between the inner wall of the pipeline and the tobacco material causes the tobacco to be transported. A certain degree of crushing is produced, and the crushing of tobacco is uncontrollable. If the crushing rate of tobacco is too high, it will affect the quality level of the finished cigarette products. The usual solution is to improve the smoothness of the inner wall of the conveying pipe. However, friction between the tobacco and the inner wall of the pipe will still occur during transportation, especially at the turning points of the pipe. In practice, the layout of the pipeline must adapt to the layout of various equipment in the workshop, and the pipeline may pass through multiple workshops. Therefore, the pipeline as a whole will have a turning point, which is usually set as an arc-shaped bend. When the conveyed tobacco passes through the arc bend at high speed, under the action of centripetal force, the tobacco and the outer circle of the pipe at the arc bend produce more serious friction, which further produces an uncontrollable crushing effect on the tobacco. Utility Model Content

[0003] The purpose of the present application is to provide a double-layer curved pipe structure, a pipe section and a material conveying pipeline, through which the tobacco shreds can be pneumatically conveyed to effectively reduce the breakage of the tobacco shreds, thereby effectively solving the deficiencies in the prior art.

[0004] To this end, in a first aspect, an embodiment of the present application provides a double-layer curved pipe structure, including:

[0005] The first inner tube has at least a middle portion thereof arranged in a unidirectionally curved shape;

[0006] A first sheath is disposed on the outer side of the first inner tube along the direction of the first inner tube, at least the curved portion of the first inner tube is covered by the first sheath, both ends of the first inner tube extend out of the first sheath, and a closed gap is formed between the first sheath and the first inner tube;

[0007] Among them, the outer curved part of the curved part of the first inner tube covered by the first sleeve is provided with a first ventilation window, and the first sleeve is provided with a first ventilation component with adjustable ventilation volume. In the working state, the material is transported in the first inner tube, and the external airflow blows the material through the first ventilation component and the first ventilation window.

[0008] In some possible implementations, the first ventilation window includes a plurality of first ventilation holes, the plurality of first ventilation holes are symmetrically arranged relative to a plane where the axis of the curved portion of the first inner tube is located, and the plurality of first ventilation holes are evenly arranged along the axis of the first inner tube.

[0009] In some possible implementations, in a plane where the axis of the first inner tube curved portion is located, an angle of 45 degrees is formed between the projection of the axis of the first ventilation hole and the projection of the tangent line of the axis of the first inner tube curved portion at a corresponding position.

[0010] In some possible implementations, the first sheath is a tubular structure coaxial with the first inner tube, and both ends of the first sheath are connected to the outer wall of the first inner tube through a first connecting piece.

[0011] In some possible implementations, the first ventilation component includes a first ventilation slot disposed on a first cover and a first set movably disposed on the first cover, and when the first set is movable on the first cover, the area of ​​the first ventilation slot blocked can be adjusted.

[0012] In a second aspect, an embodiment of the present application further provides a pipeline section, including the double-layer elbow structure as described above, and further including:

[0013] The second inner tube runs straight;

[0014] A second sheath is disposed on the outside of the second inner tube along the direction of the second inner tube, and both ends of the second inner tube extend out of the second sheath, so that a closed gap is formed between the second sheath and the outer wall of the second inner tube;

[0015] The second inner tube is provided with a second ventilation window on the portion covered by the second jacket, and the second jacket is provided with a second ventilation component with adjustable ventilation volume. In the working state, the material is transported in the second inner tube, and the external airflow blows the material through the second ventilation component and the second ventilation window;

[0016] One end of the first inner tube is connected to one end of the second inner tube.

[0017] In some possible implementations, the second ventilation window includes a plurality of groups of second ventilation holes disposed on the second inner tube, each group of second ventilation holes has a plurality of second ventilation holes, and each group of second ventilation holes is arranged in a spiral shape along the direction of the second inner tube.

[0018] In some possible implementations, the axis of the second ventilation hole and the conveying direction of the material in the second inner tube form an angle of 45 degrees.

[0019] In some possible implementations, the second sheath is a tubular structure coaxial with the second inner tube, the two ends of the second sheath are connected to the outer wall of the second inner tube through a second connecting piece, and the second ventilation assembly includes a second ventilation groove arranged on the second sheath and a second kit movably arranged on the second sheath, and the second kit can adjust the area of ​​the second ventilation groove blocked when it is movably adjusted on the second sheath.

[0020] In a third aspect, an embodiment of the present application also provides a material conveying pipeline, comprising the pipeline section as described above, so that the path of the material conveying pipeline forms a conveying line combining multiple straight paths and multiple turning paths, wherein the straight path is at least partially composed of at least one group of second inner tubes and second sheaths.

[0021] According to the double-layer curved pipe structure, pipeline section and material conveying pipeline provided in the embodiment of the present application, when tobacco and other materials are pneumatically conveyed through the material conveying pipeline, under the action of the pressure difference at both ends of the material conveying pipeline, tobacco and other materials can be conveyed in the material conveying pipeline, and the inside of the material conveying pipeline is generally negative pressure relative to the outside world. Under the action of the first ventilation hole, the tobacco is blown outward at the turning point of the pipeline, which effectively reduces the impact and friction between the tobacco and the pipe wall at the turning point. Under the action of the second ventilation hole, when the tobacco is conveyed in a straight line, a certain separation effect can be produced between the tobacco and the pipe wall, which also effectively reduces the breakage rate of the tobacco. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a double-layer elbow structure provided in an embodiment of the present application;

[0023] Figure 2 for Figure 1 Exploded diagram of

[0024] Figure 3 An exploded view of a first sheath provided in an embodiment of the present application;

[0025] Figure 4 A side view of a first inner tube provided in an embodiment of the present application;

[0026] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0027] Figure 6 A schematic diagram of the structure of a pipeline section provided in an embodiment of the present application;

[0028] Figure 7 A schematic diagram of a partial structure of a pipeline section provided in an embodiment of the present application;

[0029] Figure 8 for Figure 7 Exploded diagram of

[0030] Fig. 9 A schematic diagram of the structure of a second sheath provided in an embodiment of the present application;

[0031] Fig.10 A schematic diagram of a partial structure of a second inner tube provided in an embodiment of the present application;

[0032] Fig.11 This is a schematic diagram of the structure of the material conveying pipeline provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0034] like Figure 1-Figure 11 As shown, an embodiment of the present application provides a material conveying pipeline, which is used for pneumatic conveying of materials, preferably, for pneumatic conveying of tobacco in a cigarette factory. In the past, when pneumatically conveying tobacco, cigarette factories used a closed pipe to generate a pressure difference at both ends of the pipe. The method of generating the pressure difference is mostly to drive a negative pressure fan at one end of the discharge material, so that the tobacco is conveyed in the pipe, and the inside of the pipe is negative pressure relative to the outside of the pipe, that is, the pressure in the pipe is less than the pressure outside the pipe. In actual pneumatic conveying, due to the high speed of tobacco conveying, the friction and impact between the tobacco and the inner wall of the pipe are more serious, especially at the turning point of the pipe, the friction and impact of the tobacco are more serious, so the tobacco will be crushed to a certain extent. Although the tobacco needs to be crushed to a certain extent during the processing, the crushing in this case is uncontrollable, which is not conducive to the control of the tobacco crushing rate and affects the quality of subsequent cigarette products.

[0035] The material conveying pipeline provided in the application is intended to reduce the breakage rate of tobacco shreds during pneumatic conveying. Specifically, the material conveying pipeline includes a pipeline section, and the pipeline section includes a double-layer bent pipe structure.

[0036] A double-layer curved tube structure provided in an embodiment of the present application preferably includes a first inner tube 11, the first inner tube 11 is a hollow tube with a circular cross-section, and at least a local portion of the middle portion of the first inner tube 11 is unidirectionally curved, that is, the first inner tube 11 can be unidirectionally curved as a whole, or the middle portion of the first inner tube 11 is unidirectionally curved and both ends of the first inner tube 11 are straight, or one end of the first inner tube 11 is straight and the rest is unidirectionally curved. The unidirectional bending refers to the deflection of the first inner tube 11 in one direction within a plane, for example, in a circular arc shape, or as a part of a parabola, etc. The specific bending form is described in detail below, and the change in the forward direction angle between one end and the other end of the first inner tube 11 is not greater than 90 degrees, so as to avoid poor transportation due to excessive turning angle during tobacco transportation. Preferably, the angle between one end of the first inner tube 11 and the other end of the first inner tube 11 is changed to 90 degrees, which is convenient for workshop layout.

[0037] The double-layer curved tube structure also includes a first sheath 12, which is arranged on the outside of the first inner tube 11 along the direction of the first inner tube 11, and at least the curved portion of the first inner tube 11 is covered by the first sheath 12, and both ends of the first inner tube 11 extend out of the first sheath 12, and a closed gap space is formed between the first sheath 12 and the first inner tube 11. On this basis, a first ventilation window is arranged on the curved portion of the first inner tube 11 covered by the first sheath 12, and a first ventilation component is arranged on the first sheath 12. The first ventilation component can adjust the ventilation volume. In the working state, the tobacco material is transported in the first inner tube 11. Since the first inner tube 11 is under negative pressure, the external airflow can pass through The first ventilation component and the first ventilation window blow the tobacco. When the tobacco is transported, under the action of the internal and external pressure difference, the external airflow passes through the first ventilation component and enters the gap space between the first sheath 12 and the first inner tube 11, and then blows into the first inner tube 11 through the first ventilation window on the first inner tube 11, so that the tobacco can be blown. Moreover, the first ventilation window is arranged at the outer bend position of the curved part of the first inner tube 11. Therefore, when the transported tobacco passes through the curved part of the first inner tube 11, the first ventilation window blows the tobacco inward at the outer bend, which has an effect similar to an air cushion, so it can effectively reduce the impact and friction strength between the tobacco and the tube wall at the turning point, and thus can effectively reduce the breakage of the tobacco.

[0038] Preferably, the first ventilation window includes a plurality of first ventilation holes 110, and the plurality of first ventilation holes 110 are symmetrically arranged relative to the plane where the axis of the curved part of the first inner tube 11 is located, and are evenly arranged along the axis of the first inner tube 11. Therefore, at the outer bend of the curved part of the first inner tube 11, the first ventilation holes 110 are evenly and symmetrically arranged, which can evenly blow the internal tobacco, and is more conducive to reducing the friction and impact between the tobacco and the inner wall.

[0039] More preferably, the first ventilation hole 110 passes through the tube wall of the first inner tube 11, and the axial direction of the first ventilation hole 110 is inclined toward the inside of the first inner tube 11 toward the conveying direction of the tobacco, and in the plane where the axis of the curved part of the first inner tube 11 is located, the angle between the axial projection of the first ventilation hole 110 and the tangent projection of the axis of the curved part of the first inner tube 11 at the corresponding position of the first ventilation hole 110 is 45 degrees, so that the airflow blown by the first ventilation hole 110 can reduce the impact and friction strength between the tobacco and the tube wall on the one hand, and can also accelerate the advancement of the tobacco on the other hand, which is beneficial to the smooth conveyance of the tobacco.

[0040] For the first sheath 12, it can be a sealed box body covered on the outside of the first inner tube 11. Preferably, the first sheath 12 is a tubular structure coaxial with the first inner tube 11. The first sheath 12 is also a tube structure, which is coaxially arranged with the first inner tube 11. The inner diameter of the first sheath 12 is larger than the outer diameter of the first inner tube 11, thereby generating an annular space between the first sheath 12 and the first inner tube 11. The annular space is more conducive to the uniform distribution of airflow, and the internal tobacco can be blown more evenly through the first ventilation holes 110. The two ends of the first sheath 12 are respectively connected to the outer wall of the first inner tube 11 through the first connecting piece. The first connecting piece not only connects the first sheath 12 and the first inner tube 11, but also seals the end of the first sheath 12 and the first inner tube 11.

[0041] Preferably, the first ventilation component includes a first ventilation slot 120 arranged on the first sheath 12 and a first set 13 arranged on the first sheath 12, the first ventilation slot 120 penetrates the tube wall of the first sheath 12, the first set 13 can be movably adjusted on the first sheath 12, and when the first set 13 is movably adjusted on the first sheath 12, the area of ​​the first ventilation slot 120 blocked can be changed. In one example, the first ventilation slot 120 has a certain length, and the length direction of the first ventilation slot 120 is parallel to the direction of the first sheath 12, and the first set 13 is a hoop sleeved on the outer wall of the first sheath 12, and a A notch makes the hoop roughly C-shaped, and the hoop can be made of a material with a certain elasticity. Relying on the elasticity, the hoop hugs the outer wall of the first sheath 12, and when the hoop slides axially along the outer surface of the first sheath 12, the hoop can completely cover the first ventilation slot 120, cover part of the first ventilation slot 120, or not cover the ventilation slot at all, and then by sliding the hoop along the axial direction of the first sheath 12, the ventilation volume of the first ventilation slot 120 can be adjusted, and the ventilation volume at this location can be adjusted according to the actual effect of conveying tobacco, so that the tobacco can pass smoothly at the turning point and the crushing rate of the tobacco is kept as low as possible.

[0042] The embodiment of the present application also provides a pipeline section. Preferably, the pipeline section includes the above-mentioned double-layer curved pipe structure, and also includes a second inner tube 21 and a second sheath 22. The second inner tube 21 is arranged to be straight. The second inner tube 21 is a tube structure with a circular cross-section and openings at both ends. The second sheath 22 is arranged on the outside of the second inner tube 21 along the direction of the second inner tube 21. Both ends of the second inner tube 21 extend out of the second sheath 22. A closed gap space is formed between the outer walls of the second sheath 22 and the second inner tube 21. A second ventilation window is provided on the portion of the second inner tube 21 covered by the second sheath 22. A second ventilation component is provided on the second sheath 22. The ventilation volume of the second ventilation component can be adjusted. In the working state, the tobacco is The tobacco is transported inside the second inner tube 21, and the external airflow blows the material in the second inner tube 21 through the second ventilation component and the second ventilation window. In practice, under the action of the internal and external pressure difference, the outside air passes through the second ventilation component and enters the gap space between the second sheath 22 and the second inner tube 21, and then the air in the gap space enters the second inner tube 21 through the second ventilation window on the second inner tube 21, thereby blowing the tobacco transported in the second inner tube 21, and also producing an air cushion-like effect, so that the tobacco and the inner wall of the second inner tube 21 maintain slight contact or even no contact, thereby reducing the impact and friction strength between the tobacco and the tube wall of the second inner tube 21, thereby achieving the effect of reducing the breakage of the tobacco.

[0043] One end of the first inner tube 11 is connected to one end of the second inner tube 21 to form a continuous unidirectional conveying path.

[0044] At this point, under the action of the pipeline section, the effect of reducing tobacco breakage can be achieved in both straight and turning transportation situations. The overall effect is achieved through the internal and external pressure difference, so that the external airflow blows the tobacco transported inside, achieving an effect similar to air suspension, so that there is a certain separation effect between the tobacco and the tube wall, reducing the impact and friction strength between the tobacco and the tube wall, and thereby reducing the breakage rate of the transported tobacco.

[0045] The second ventilation window preferably includes a plurality of groups of second ventilation holes 210 arranged on the second inner tube 21, the plurality of groups of second ventilation holes 210 are centrally symmetrically arranged relative to the axis of the second inner tube 21, and the number of each group of second ventilation holes 210 is multiple, and the second ventilation holes 210 of each group are arranged in a spiral shape along the direction of the second inner tube 21. Preferably, the positions of the second ventilation holes 210 are regularly distributed and manufactured using four rifling spiral lines, and the rifling spiral lines are also rifling lines. Therefore, the plurality of second ventilation holes 210 are spirally wound around the tube wall of the second inner tube 21, and the axial direction of the second ventilation holes 210 is toward the inside of the second inner tube 21 and inclined toward the conveying direction of the material, and then, in the plurality of Under the blowing action of the second ventilation hole 210, the purpose of reducing the friction and impact effect between the tobacco and the tube wall is achieved, and the tobacco in the second inner tube 21 can have a tendency to spiral forward, which can effectively improve the smoothness of tobacco transportation and help reduce energy effects. In this embodiment, preferably, the axis of the second ventilation hole 210 passes through the axial direction of the second inner tube 21, and the axial direction of the second ventilation hole 210 and the conveying direction of the material in the second inner tube 21 are at an angle of 45 degrees. Under the blowing action of the second ventilation hole 210, the tobacco and the tube wall of the second inner tube 21 have a tendency to separate, and the advancement of the tobacco is accelerated, which is more conducive to the smooth transportation of the tobacco and helps reduce energy consumption.

[0046] In this embodiment, the second sheath 22 can be a box structure covered on the outside of the second inner tube 21. Preferably, the second sheath 22 is a tubular structure coaxial with the second inner tube 21. The second sheath 22 is also a tube structure with a circular cross-section. The two ends of the second sheath 22 are respectively connected to the outer wall of the second inner tube 21 through a second connecting piece. The second connecting piece not only connects the end of the second sheath 22 and the outer wall of the second inner tube 21, but also has a sealing effect between the end of the second sheath 22 and the outer wall of the second inner tube 21.

[0047] The second ventilation assembly includes a second ventilation slot 220 arranged on the second sheath 22 and a second set 23 arranged on the second sheath 22. The second set 23 can be movably adjusted on the second sheath 22. When the second set 23 is adjusted on the second sheath 22, the area of ​​the second ventilation slot 220 blocked by the second set 23 can be adjusted, thereby achieving the adjustment of the ventilation volume of the second ventilation slot 220. The second ventilation slot 220 runs through the tube wall of the second sheath 22. The second ventilation slot 220 has a certain length. The length direction of the second ventilation slot 220 is parallel to the axial direction of the second sheath 22. The second set 23 can be a hoop sleeved on the outside of the second sheath 22, and the hoop has a The notch makes the hoop C-shaped, and the material of the hoop has a certain elasticity. Under the effect of the elasticity of the material, the hoop embraces the outside of the second sheath 22. When the hoop slides on the outer surface of the second sheath 22 along the axial direction of the second sheath 22, the hoop can completely cover the second ventilation slots 220, cover part of the second ventilation slots 220, or completely cover the second ventilation slots 220, thereby achieving the purpose of adjusting the ventilation volume of the second ventilation slots 220. According to the actual situation of tobacco transportation, the ventilation volume of the second ventilation slots 220 is adjusted, so that the tobacco in the second inner tube 21 and the tube wall of the second inner tube 21 maintain a low contact level, and the tobacco transportation efficiency can be maintained at a good level.

[0048] A material conveying pipeline provided in an embodiment of the present application includes the above-mentioned pipeline section, so that the path of the material conveying pipeline forms a conveying line in which multiple straight paths and multiple turning paths are combined with each other. According to the actual situation of the workshop, the line can be conveniently laid out. In this embodiment, for the turning path, the turning path is composed of a double-layer curved pipe structure, and the straight path is composed of a combination of a second inner tube 21 and a second sheath 22. For each straight path, it can be completely composed of a combination of the second inner tube 21 and the second sheath 22, or only partially composed of a second inner tube 21 and a second sheath The outer tube 22 is composed of a combination of the second inner tube 21 and the rest is a tube structure with the same specification as the second inner tube 21, one end of the tube structure is connected to the second inner tube 21, and the other end is connected to the first inner tube 11 of the turning path. In addition, it can also be a combination of multiple groups of second inner tubes 21 and second sheaths 22 on a straight path. In this example, the combinations can be directly connected to each other through the second inner tube 21, or can be connected to each other through tube structures with the same specification as the second inner tube 21. That is to say, in the straight path, the tobacco can be blown throughout the whole process or in part of the section.

[0049] When the first set 13 and the second set 23 adjust the ventilation volume of the first ventilation slot 120 and the second ventilation slot 220, on the one hand, the suspension effect of tobacco can be adjusted. On the other hand, by adjusting the ventilation volume on the entire conveying path, excessive ventilation volume can be prevented from affecting the pressure difference between the inside and the outside, thereby avoiding affecting the normal conveying of tobacco.

[0050] In order to facilitate the layout of each pipe fitting, the portion of the first inner tube 11 extending out of the first sheath 12 is detachably connected to the first inner tube 11, and the extended portion has the same specifications as the first inner tube 11. In the following, the extended portion is referred to as a transition tube 115. Both ends of the portion of the first inner tube 11 covered inside the first sheath 12 are straight sections, and the portion between the two straight sections is a curved section. The first sheath 12 and the portion of the first inner tube 11 covered are coaxially arranged, and furthermore, both ends of the first sheath 12 are also straight sections, and the portion between the two straight sections of the first sheath 12 is curved. It is divided into a curved section, and a first sealing ring 18 is arranged between the end of the straight section of the first jacket 12 and the end of the straight section of the first inner tube 11. The first sealing ring 18 seals the gap space between the first inner tube 11 and the first jacket 12. A first flange 61 is arranged at the end of the straight section of the first jacket 12, and a second flange 62 is arranged at the end of the transition pipe 115. The first flange 61 and the second flange 62 can be connected by a bolt assembly, and a sealing gasket can also be arranged between the first flange 61 and the second flange 62 to increase the sealing performance, thereby realizing the assembly of various components.

[0051] In this example, the portion of the first inner tube 11 covered by the first sheath 12 includes a curved section and straight sections at both ends of the curved section. The axis direction of the curved section conforms to the sine function. , specifically, the symmetrical part of the sine function at the crest or trough, and the radius of curvature R at the bend min The smaller the size, the more serious the breakage of tobacco. The curvature K takes the maximum value when: , (n is an integer), then

[0052]

[0053] The radius of curvature is R min :

[0054]

[0055] It can be seen that the smaller α and ω are, the smaller R min The larger the value, the lower the crushing of the tobacco shreds, but the space occupied by the tobacco shreds conveying tube increases. Therefore, α≤1, ω≤1, that is, the embodiment selects .

[0056] In practice, the angle change of the straight sections at both ends of the curved section is 90 degrees. For the right-angle turn in this case, the function When designing a pipe bend, its first-order derivative is: , take any two points on the curve, for example, take points x1 and x2, then the condition for the tangent equations through points x1 and x2 to be perpendicular is: ,Right now:

[0057]

[0058]

[0059] Design the straight segments at both ends according to the tangent lines passing through points x1 and x2, so that the two straight segments are perpendicular.

[0060] In this embodiment, α=1, ω=1, that is, , then it satisfies:

[0061]

[0062] because , the conditions that satisfy this equation are: , k is an integer, then the two points x1 and x2 are on the coordinate axis, respectively located in the equation The inflection point (peak or trough) of the wave is on both sides, and the derivatives are alternately 1 and -1. The angles between the tangents through points x1 and x2 and the positive direction of the x-axis are 45 degrees and 135 degrees respectively. Therefore, all points through x k+1 、x k+2 The tangent lines of a point are perpendicular to each other.

[0063] The first sheath 12 and the covered parts of the first inner tube 11 are coaxially arranged, and in order to facilitate the installation of the first inner tube 11 inside the first sheath 12, the first sheath 12 can be set as a split structure of a left half 128 and a right half 129. The left half 128 and the right half 129 are symmetrical with respect to the plane where the axis of the first sheath 12 is located. The left half 128 and the right half 129 are surrounded by the outside of the first inner tube 11 and can be welded and connected, which makes assembly more convenient. Preferably, the outer diameter of the first inner tube 11 is 120 mm, and the inner diameter of the first sheath 12 is 140 mm. The gap between the first inner tube 11 and the first sheath 12 is 10 mm, and the aperture of the first ventilation hole 110 is 2 mm.

[0064] Similarly, the portion of the second inner tube 21 extending out of the second sheath 22 can be detachably connected to the second inner tube 21. The extended portion of the second inner tube 21 has the same specifications as the second inner tube 21. The extended portion of the second inner tube 21 is referred to as the connecting section 215 in the following text. A second sealing ring 19 is arranged at the gap space between the end of the portion of the second inner tube 21 covered by the second sheath 22 and the end of the second sheath 22. The second sealing ring 19 seals the gap space between the second sheath 22 and the second inner tube 21. A third flange 63 is arranged at the two extreme ends of the second sheath 22. A fourth flange 64 is arranged at the end of the connecting section 215. The third flange 63 and the fourth flange 64 can be connected by a bolt assembly. A sealing gasket can also be arranged between the third flange 63 and the fourth flange 64 to increase the sealing performance, thereby realizing the assembly of the components.

[0065] The first sealing ring 18 and the second sealing ring 19 can both be made of rubber.

[0066] Preferably, in one example, the outer diameter of the second inner tube 21 is 120 mm, and the inner diameter of the second sheath 22 is 140 mm, then the gap between the second inner tube 21 and the second sheath 22 is 10 mm, and the second ventilation holes 210 on the second inner tube 21 are 4 groups, that is, 4 rifling helices are regularly distributed and manufactured, the rifling helices are rifling, the pitch of the helices is 200 mm, the number of turns is 8.75, the number of second ventilation holes 210 in each group is 80, and the aperture of the second ventilation holes 210 is 2 mm.

[0067] In one example, if Fig.11 As shown, it is composed of four groups of pipeline sections, the second jacket 22 in the pipeline section of the first group is arranged horizontally, the connecting section 215 at one end of the second jacket 22 is coaxially connected to the transition pipe 115 of the same group, the transition pipe 115 at the other end of the first jacket 12 of the group is coaxially connected to the connecting section 215 of the second group of pipeline sections, the connecting section 215 at the other end of the second jacket 22 of the second group of pipeline sections is coaxially connected to the transition pipe 115 of the same group, the transition pipe 115 at the other end of the first jacket 12 of the group is coaxially connected to the connecting section 215 of the third group of pipeline sections, and the connecting section 215 at the other end of the second jacket 22 of the third group of pipeline sections is coaxially connected to the transition pipe 115 of the same group. At this point, the conveying path is in the same plane, and the axial direction of the transition pipe 115 at the other end of the first jacket 12 of the third group of pipeline sections is perpendicular to the above-mentioned same plane.

[0068] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0069] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0070] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0071] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. Double-layer curved pipe structure, characterized in that: include: The first inner tube has at least a middle portion thereof arranged in a unidirectionally curved shape; A first sheath is disposed on the outer side of the first inner tube along the direction of the first inner tube, at least the curved portion of the first inner tube is covered by the first sheath, both ends of the first inner tube extend out of the first sheath, and a closed gap is formed between the first sheath and the first inner tube; Among them, the outer curved part of the curved part of the first inner tube covered by the first sleeve is provided with a first ventilation window, and the first sleeve is provided with a first ventilation component with adjustable ventilation volume. In the working state, the material is transported in the first inner tube, and the external airflow blows the material through the first ventilation component and the first ventilation window.

2. The double-layer curved pipe structure according to claim 1, characterized in that: The first ventilation window includes a plurality of first ventilation holes, which are symmetrically arranged relative to the plane where the axis of the curved portion of the first inner tube is located, and are evenly arranged along the axis of the first inner tube.

3. The double-layer curved pipe structure according to claim 2, characterized in that: In the plane where the axis of the first inner tube curved portion is located, an angle of 45 degrees is formed between the axis projection of the first ventilation hole and the axis tangent projection of the first inner tube curved portion at the corresponding position.

4. The double-layer curved pipe structure according to claim 1, characterized in that: The first sheath is a tubular structure coaxial with the first inner tube, and both ends of the first sheath are connected to the outer wall of the first inner tube through a first connecting piece.

5. The double-layer curved pipe structure according to claim 4, characterized in that: The first ventilation component includes a first ventilation slot arranged on the first cover and a first set movably arranged on the first cover. When the first set movably moves on the first cover, the area of ​​the first ventilation slot blocked can be adjusted.

6. A pipeline section, characterized in that: The double-layer curved pipe structure according to any one of claims 1 to 5 further comprises: The second inner tube runs straight; A second sheath is disposed on the outside of the second inner tube along the direction of the second inner tube, and both ends of the second inner tube extend out of the second sheath, so that a closed gap is formed between the second sheath and the outer wall of the second inner tube; The second inner tube is provided with a second ventilation window on the portion covered by the second jacket, and the second jacket is provided with a second ventilation component with adjustable ventilation volume. In the working state, the material is transported in the second inner tube, and the external airflow blows the material through the second ventilation component and the second ventilation window; One end of the first inner tube is connected to one end of the second inner tube.

7. The pipeline section according to claim 6, characterized in that: The second ventilation window includes a plurality of groups of second ventilation holes arranged on the second inner tube, each group of second ventilation holes has a plurality of second ventilation holes, and each group of second ventilation holes is arranged in a spiral shape along the direction of the second inner tube.

8. The pipeline section according to claim 7, characterized in that: The axis of the second ventilation hole and the conveying direction of the material in the second inner tube form an angle of 45 degrees.

9. The pipeline section according to claim 6, characterized in that: The second sheath is a tubular structure coaxial with the second inner tube, and the two ends of the second sheath are connected to the outer wall of the second inner tube through a second connecting piece. The second ventilation assembly includes a second ventilation groove arranged on the second sheath and a second kit movably arranged on the second sheath. When the second kit is movably adjusted on the second sheath, the area of ​​the second ventilation groove blocked can be adjusted.

10. Material conveying pipeline, characterized in that: Comprising the pipeline section as described in any one of claims 6-9, so that the path of the material conveying pipeline forms a conveying line combining multiple straight paths and multiple turning paths, wherein the straight path is at least partially composed of at least one group of second inner tubes and second sheaths.

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