Variable curve blanking pipe and bulk material conveying equipment

Abstract

The utility model relates to a variable curve blanking pipe and bulk material conveying equipment, and relates to the technical field of material transfer equipment, the variable curve blanking pipe comprises a fixed blanking pipe, and one end of the fixed blanking pipe is used for receiving materials conveyed by a conveying mechanism; the variable blanking pipe is arranged at the other end of the fixed blanking pipe and communicates with the fixed blanking pipe, and the variable blanking pipe is rotationally connected with the fixed blanking pipe; and the driving mechanism is connected with the variable blanking pipe and is used for driving the variable blanking pipe to rotate relative to the fixed blanking pipe so as to change the curve of the blanking pipe. The variable blanking pipe is rotationally connected with the fixed blanking pipe, and the driving mechanism is used for driving the variable blanking pipe to rotate relative to the fixed blanking pipe so as to change the curve of the blanking pipe, so that the curve of the blanking pipe is matched with the moving track of material particles, the impact of the material particles on the variable blanking pipe is reduced, and the environmental protection property and the safety in use are improved; the problems that in the prior art, flying dust affects the surrounding environment, and accumulation is caused in a discharging pipe are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of material transfer equipment, in particular to a variable curve drop pipe and bulk material conveying equipment. Background Art

[0002] In the bulk material conveying system, the drop pipe is a material conveying pipeline that avoids excessive dust during the material falling process and plays a role in diversion and diversion during the falling process. Affected by the block diameter and water content of the material (coal, coke, ore, etc.), the material may adhere to the inner wall of the drop pipe (chute) when impacting and flowing through the drop pipe (chute), causing material accumulation and blockage, seriously affecting the conveying efficiency and safe production.

[0003] In the prior art, for example, a coal delivery system coal drop pipe with patent number CN207142063U includes a head cover, an arc-shaped flow guide baffle, an anti-stuck tee, and a chute. An arc-shaped flow guide baffle is arranged under the head cover, an anti-stuck tee is installed under the arc-shaped flow guide baffle, the arc-shaped flow guide baffle is arranged inside the head cover, connected to the inner wall of the head cover and the anti-stuck tee, a chute is arranged under the anti-stuck tee, the chute is arranged inside the coal drop pipe, and is divided into No. 1 chute and No. 2 chute, the No. 1 chute is connected to the guide chute, and the bottom of the guide chute is connected to the feeding spoon chute. It is beneficial to reduce the number of coal sticking and coal running in the coal drop pipe, greatly improve the safety and stability of the equipment, and ensure the normal operation of the coal delivery system.

[0004] However, due to the different block diameters and water contents of the materials, the material falling curves are different. When the material falling curve does not match the drop pipe curve of the bulk material conveying system, the material will hit the inner wall of the drop pipe at high speed, causing material breakage, excessive wear of the drop pipe, and dust generation. At the same time, it may cause material adhesion to the inner wall of the drop pipe, which may cause material accumulation and blockage in the drop pipe, thus seriously affecting normal production operations. Utility Model Content

[0005] The present application provides a variable curve drop pipe and bulk material conveying equipment, which can solve the problem in the prior art that due to the different block diameters and water contents of the materials, the material falling curves are different. When the material falling curve does not match the drop pipe curve of the bulk material conveying system, the material will hit the inner wall of the drop pipe at high speed, causing the material to break, the drop pipe to be excessively worn, and dust to be generated. At the same time, it may cause the material to adhere to the inner wall of the drop pipe, which may cause material accumulation and blockage in the drop pipe, thereby seriously affecting the normal production operation.

[0006] In a first aspect, an embodiment of the present application provides a variable curve drop tube, which includes:

[0007] A fixed drop tube, one end of which is used to receive the material transported by the transport mechanism;

[0008] A variable drop pipe, which is arranged at the other end of the fixed drop pipe and communicated with the fixed drop pipe, and the variable drop pipe is rotatably connected to the fixed drop pipe;

[0009] The driving mechanism is connected to the variable drop tube and is used to drive the variable drop tube to rotate relative to the fixed drop tube so as to change the curve of the drop tube.

[0010] In combination with the first aspect, in one embodiment, it further includes a fixed platform connected to the fixed drop tube, and the driving mechanism is arranged on the fixed platform and is rotatably connected to the variable drop tube.

[0011] In combination with the first aspect, in one embodiment, the driving mechanism is a telescopic rod, one end of which is rotatably connected to the fixed platform, and the other end of which is rotatably connected to the variable drop tube, for driving the variable drop tube to rotate.

[0012] In combination with the first aspect, in one embodiment, an adjustment baffle is provided at the end of the variable drop tube away from the fixed drop tube, and the adjustment baffle is used to block the material so that the material flows out from the discharge end at a set angle.

[0013] In combination with the first aspect, in one embodiment, the fixed drop pipe includes an inlet section and a first branch section and a second branch section connected thereto, and the first branch section and the second branch section are both connected to the variable drop pipe.

[0014] In combination with the first aspect, in one embodiment, it further includes a head shield, which is arranged at the inlet section of the fixed drop pipe and has an opening for the discharge end of the transport mechanism to extend into.

[0015] In combination with the first aspect, in one embodiment, a diverter component is provided in the head shield, and the diverter component is used to divert the material transported by the transport mechanism so that the material enters the first branch segment or the second branch segment.

[0016] In combination with the first aspect, in one embodiment, the flow diversion component includes:

[0017] an arc-shaped splitter plate, which is arranged in the head shield;

[0018] A rotating shaft is rotatably connected to the head shield and connected to the arc-shaped splitter plate, and the rotating shaft is used to adjust the inclination angle of the arc-shaped splitter plate by rotation.

[0019] In combination with the first aspect, in one embodiment, the fixed platform is provided with two through holes for the first branch segment and the second branch segment to pass through, the diameter of the variable drop tube is larger than the diameter of the first branch segment and the second branch segment, and the variable drop tube is respectively sleeved on the outer side of the end of the first branch segment and the second branch segment passing through the fixed platform, and the upper end of the variable drop tube is rotatably connected to the fixed platform.

[0020] In a second aspect, an embodiment of the present application further provides a bulk material conveying device, which includes the above-mentioned variable curve coal drop pipe.

[0021] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0022] When the variable curve drop tube is used, the fixed drop tube is connected to the transport mechanism so that the fixed drop tube receives the material transported by the transport mechanism, the variable drop tube is connected to the other end of the fixed drop tube, and the drive mechanism is connected to the variable drop tube. Since the variable drop tube is rotatably connected to the fixed drop tube, the drive mechanism is used to drive the variable drop tube to rotate relative to the fixed drop tube to change the curve of the drop tube so that the curve of the drop tube matches the running trajectory of the material particles, reducing the impact of the material particles on the variable drop tube, improving the environmental protection and safety of use, and solving the problem in the prior art that due to the different block diameters and water contents of the materials, the material falling curves are different. When the material falling curve does not match the drop tube curve of the bulk material conveying system, the material will hit the inner wall of the drop tube at high speed, causing the material to break, the drop tube to be excessively worn, and dust to be generated. At the same time, it may cause the material to adhere to the inner wall of the drop tube, which may cause material accumulation and blockage in the drop tube, thereby seriously affecting the normal production operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a front view structural schematic diagram of an embodiment of a variable curve drop tube of the utility model.

[0025] Figure 2 It is a structural schematic diagram of a flow diversion component in an embodiment of a variable curve drop pipe of the utility model.

[0026] Figure 3 The utility model is a side view of a variable curve drop tube embodiment.

[0027] Figure 4 It is a structural schematic diagram of an adjusting baffle in an embodiment of a variable curve drop tube of the utility model.

[0028] Figure 5 It is a structural schematic diagram of an embodiment of a variable curve drop tube of the utility model.

[0029] Figure 6 It is a schematic structural diagram of the connection between the branch section and the variable dropping tube in an embodiment of a variable curve dropping tube of the utility model.

[0030] In the figure: 1. Fixed drop pipe; 11. Inlet section; 12. Branch section; 121. First branch section; 122. Second branch section; 2. Transport mechanism; 3. Variable drop pipe; 4. Drive mechanism; 41. Telescopic rod; 5. Diverter assembly; 51. Arc diverter plate; 52. Rotating shaft; 6. Adjusting baffle; 7. Fixed platform; 8. Head guard; 9. Conveyor belt. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solution of the present application, 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 only 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 creative work are within the scope of protection of this application.

[0032] The embodiments of the present application provide a variable curve drop pipe and bulk material conveying equipment, which can solve the problem in the prior art that due to the different block diameters and water contents of the materials, the material falling curves are different. When the material falling curve does not match the drop pipe curve of the bulk material conveying system, the material will hit the inner wall of the drop pipe at high speed, causing material breakage, excessive wear of the drop pipe, and dust generation. At the same time, it may cause the material to adhere to the inner wall of the drop pipe, which may cause material accumulation and blockage in the drop pipe, thereby seriously affecting the normal production operation.

[0033] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, on the one hand, the present application provides a variable curve drop tube, which includes:

[0034] A fixed drop pipe 1, one end of which is used to receive the material transported by the transport mechanism 2;

[0035] The variable blanking tube 3 is arranged at the other end of the fixed blanking tube 1 and communicated with the fixed blanking tube 1. The variable blanking tube 3 is rotatably connected with the fixed blanking tube 1.

[0036] The driving mechanism 4 is connected to the variable blanking tube 3 and is used to drive the variable blanking tube 3 to rotate relative to the fixed blanking tube 1 so as to change the curve of the blanking tube.

[0037] When the variable curve drop tube is used, the fixed drop tube 1 is connected with the transport mechanism 2 so that the fixed drop tube 1 receives the material transported by the transport mechanism 2, the variable drop tube 3 is connected with the other end of the fixed drop tube 1, and the drive mechanism 4 is connected with the variable drop tube 3. Since the variable drop tube 3 is rotatably connected with the fixed drop tube 1, the drive mechanism 4 is used to drive the variable drop tube 3 to rotate relative to the fixed drop tube 1 to change the curve of the drop tube so that the curve of the drop tube matches the running trajectory of the material particles, reducing the impact of the material particles on the variable drop tube 3, improving the environmental protection and safety of use, and solving the problem in the prior art that due to the different block diameters and water contents of the materials, the material falling curves are different. When the material falling curve does not match the drop tube curve of the bulk material conveying system, the material will hit the inner wall of the drop tube at high speed, causing the material to break, the drop tube to be excessively worn, and dust to be generated. At the same time, it may cause the material to adhere to the inner wall of the drop tube, which may cause material accumulation and blockage in the drop tube, thereby seriously affecting the normal production operation.

[0038] In this example, the blanking tube is designed and manufactured with a polygonal or circular cross-sectional structure, and the variable blanking tube 3 is a curved blanking tube.

[0039] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, in some optional embodiments, a fixed platform 7 connected to the fixed blanking tube 1 is further included, and the driving mechanism 4 is arranged on the fixed platform 7 and is rotatably connected to the variable blanking tube 3.

[0040] In this embodiment, the variable curve drop tube also includes a fixed platform 7 connected to the fixed drop tube 1, and the driving mechanism 4 is arranged on the fixed platform 7. The driving mechanism 4 is rotatably connected to the variable drop tube 3. The variable drop tube 3 is driven to rotate relative to the fixed drop tube 1 by the driving mechanism 4 to adjust the angle of the variable drop tube 3 relative to the fixed drop tube 1, thereby changing the curve of the drop tube.

[0041] like Figure 1 , Figure 2 and Figure 3 As shown, in some optional embodiments, the driving mechanism 4 is a telescopic rod 41, one end of the telescopic rod 41 is rotatably connected to the fixed platform 7, and the other end is rotatably connected to the variable blanking tube 3, for driving the variable blanking tube 3 to rotate.

[0042] In this embodiment, the driving mechanism 4 is specifically described as a telescopic rod 41, one end of the telescopic rod 41 is rotatably connected to the fixed platform 7, and the other end is rotatably connected to the variable blanking tube 3, which is used to drive the variable blanking tube 3 to rotate. The driving method is simple and easy to manufacture.

[0043] In this example, the telescopic rod 41 is a hydraulically driven rod.

[0044] In this example, the driving mechanism 4 may also be a telescopic mechanical arm mechanism, which drives the variable blanking tube 3 to rotate by rotating the articulated arm.

[0045] like Figure 4 As shown, in some optional embodiments, an adjustable baffle 6 is provided at the end of the variable drop pipe 3 away from the fixed drop pipe 1, and the adjustable baffle 6 is used to block the material so that the material flows out from the discharge end at a set angle.

[0046] In this embodiment, an adjusting baffle 6 is provided at the end of the variable drop tube 3 away from the fixed drop tube 1. The adjusting baffle 6 is used to block the material and reduce the falling speed of the material so that the material flows out from the discharge end at a set angle. It is used to adjust the dropping point of the material on the conveyor belt 9 to make the dropping process smoother.

[0047] like Figure 1 , Figure 2 and Figure 6 As shown, in some optional embodiments, the fixed blanking pipe 1 includes an inlet section 11 and a first branch section 121 and a second branch section 122 connected thereto, and the first branch section 121 and the second branch section 122 are both connected to the variable blanking pipe 3 .

[0048] In this embodiment, the specific structure of the fixed drop pipe 1 is described. The fixed drop pipe 1 includes an inlet section 11 and a branch section 12 connected thereto. The branch section 12 includes a first branch section 121 and a second branch section 122. The first branch section 121 and the second branch section 122 are both connected to the variable drop pipe 3. By dropping coal through the first branch section 121 and the second branch section 122, a matching drop pipe can be selected better according to demand.

[0049] In this example, the rotation direction of the variable drop tube 3 compared to the first branch section 121 is different from the rotation direction of the variable drop tube 3 compared to the second branch section 122 .

[0050] like Figure 1 and Figure 5 As shown, in some optional embodiments, a head shield 8 is further included, which is arranged at the inlet section 11 of the fixed drop pipe 1 and has an opening for the discharge end of the transport mechanism 2 to extend into.

[0051] In this embodiment, the variable curve drop tube also includes a head shield 8, which is set at the inlet section 11 of the fixed drop tube 1 and has an opening for the discharge end of the transport mechanism 2 to extend into. The head shield 8 is designed with a feeding spoon at the drop port. The feeding spoon adopts a forward-inclined closing and expansion design and penetrates into the guide trough at a height of about 200mm from the belt. The forward-inclined expansion design can effectively reduce the air pressure at the drop point and avoid the powder spraying phenomenon caused by excessive positive pressure at the drop point. The forward-inclined structure can also move the drop point forward, reducing the tail outlet powder spraying caused by the drop point being too close to the tail of the guide trough; at the same time, it ensures that the first impact point of the material is the drop tube body, which greatly reduces the damage caused by the material impacting the transport mechanism 2, thereby increasing the life of the transport mechanism 2.

[0052] In this example, the transport mechanism 2 is a belt conveyor.

[0053] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in some optional embodiments, a diverter assembly 5 is provided in the head shield 8 , and the diverter assembly 5 is used to divert the material transported by the transport mechanism 2 so that the material enters the first branch section 121 or the second branch section 122 .

[0054] In this embodiment, a diverter assembly 5 is provided in the head shield 8, and the diverter assembly 5 is used to divert the material transported by the transport mechanism 2 so that the material enters the first branch section 121 or the second branch section 122, which facilitates diversion.

[0055] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in some optional embodiments, the flow dividing component 5 includes:

[0056] An arc-shaped splitter plate 51, which is arranged in the head shield 8;

[0057] The rotating shaft 52 is rotatably connected to the head shield 8 and is connected to the arc-shaped splitter plate 51 . The rotating shaft 52 is used to adjust the inclination angle of the arc-shaped splitter plate 51 by rotation.

[0058] In this embodiment, the structure of the diverter assembly 5 is specifically described. The diverter assembly 5 includes an arc-shaped diverter plate 51 and a rotating shaft 52, wherein the arc-shaped diverter plate 51 is arranged in the head shield 8, the rotating shaft 52 is rotatably connected to the head shield 8, and is connected to the arc-shaped diverter plate 51. The rotating shaft 52 is used to adjust the inclination angle of the arc-shaped diverter plate 51 by rotation. The structure is simple and easy to manufacture.

[0059] like Figure 2 , Figure 3 and Figure 6As shown, in some optional embodiments, two through holes are provided on the fixed platform 7 for the first branch segment 121 and the second branch segment 122 to pass through, the diameter of the variable drop tube 3 is larger than the diameter of the first branch segment 121 and the second branch segment 122, the variable drop tube 3 is respectively sleeved on the outer side of the end portions of the first branch segment 121 and the second branch segment 122 passing through the fixed platform 7, and the upper end of the variable drop tube 3 is rotatably connected to the fixed platform 7.

[0060] In this embodiment, two through holes are provided on the fixed platform 7 for the first branch segment 121 and the second branch segment 122 to pass through. The diameter of the variable drop pipe 3 is larger than the diameter of the first branch segment 121 and the second branch segment 122. The variable drop pipe 3 is respectively sleeved on the outer side of the end of the first branch segment 121 and the second branch segment 122 passing through the fixed platform 7. The upper end of the variable drop pipe 3 is rotatably connected to the fixed platform 7, which improves the safety and environmental protection of the coal dropping process.

[0061] In this example, the first branch segment 121 and the second branch segment 122 may also be connected via a bendable pipe.

[0062] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, on the one hand, the present application also provides a bulk material conveying device, which includes the above-mentioned variable curve drop pipe.

[0063] When using the bulk material conveying equipment, the fixed drop pipe 1 is connected with the transport mechanism 2 so that the fixed drop pipe 1 receives the material transported by the transport mechanism 2. The variable drop pipe 3 is connected with the other end of the fixed drop pipe 1. The driving mechanism 4 is connected with the variable drop pipe 3. The discharge end of the variable drop pipe 3 corresponds to the conveyor belt 9. Since the variable drop tube 3 is rotatably connected to the fixed drop tube 1, the driving mechanism 4 is used to drive the variable drop tube 3 to rotate relative to the fixed drop tube 1 to change the curve of the drop tube so that the curve of the drop tube matches the running trajectory of the material particles, thereby reducing the impact of the material particles on the variable drop tube 3, improving the environmental protection and safety of use, and solving the problem in the prior art that due to the different block diameters and water contents of the materials, the material falling curves are different. When the material falling curve does not match the drop tube curve of the bulk material conveying system, the material will hit the inner wall of the drop tube at high speed, causing the material to break, the drop tube to be excessively worn, and dust to be generated. At the same time, it may cause the material to adhere to the inner wall of the drop tube, which may cause material accumulation and blockage in the drop tube, thereby seriously affecting the normal production operation.

[0064] In this example, the conveyor belt 9 is a belt conveyor.

[0065] On the other hand, the present application also provides a variable curve drop tube control method, which is implemented using the above-mentioned variable curve drop tube, and includes the following steps:

[0066] According to the contact speed between the material particles and the drop tube, the target curve of the drop tube is analyzed;

[0067] According to the target curve of the drop tube, the variable drop tube 3 is controlled to rotate relative to the fixed drop tube 1 to adjust the curve of the drop tube.

[0068] When using the variable curve drop tube, first analyze the contact speed between the material particles and the drop tube to obtain the target curve of the drop tube, and then drive the variable drop tube 3 to rotate relative to the fixed drop tube 1 through the driving mechanism 4 according to the target curve of the drop tube to change the curve of the drop tube so that the curve of the drop tube matches the running trajectory of the material particles, reducing the impact of the material particles on the variable drop tube 3, improving the environmental protection and safety of use, and solving the problem in the prior art that due to the different block diameters and water contents of the materials, the material falling curves are different. When the material falling curve does not match the drop tube curve of the bulk material conveying system, the material will hit the inner wall of the drop tube at high speed, causing the material to break, the drop tube to be excessively worn, and dust to be generated. At the same time, it may cause the material to adhere to the inner wall of the drop tube, which may cause material accumulation and blockage in the drop tube, thereby seriously affecting the normal production operation.

[0069] In this example, the target curve of the drop tube is analyzed based on the contact speed between the material particles and the drop tube, including simulating the coal flow state through mechanical modeling of the contact between the material particles and the drop tube, and then obtaining the contact speed between the material particles and the drop tube through simulation experiments.

[0070] In this example, after the contact speed between the material particles and the drop pipe, the target curve of the drop pipe needs to be analyzed according to the dryness and humidity of the coal and the dust conditions on site. When the target curve is reached, the angle between the contact plane between the drop material and the drop pipe and the drop curve is generally no more than 20°.

[0071] In this example, the eccentric load of the coal flow at the drop point can be identified by 3D machine vision, the best angle of the adjustment baffle 6 can be analyzed by artificial intelligence, and the corresponding adjustment baffle 6 can be adjusted.

[0072] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0073] It should be noted that, in this application, 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 presence of other identical elements in the process, method, article or device including the elements.

[0074] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A variable curve drop tube, characterized in that: include: A fixed material drop pipe (1) having one end for receiving materials transported by a transport mechanism (2); A variable material drop pipe (3), which is arranged at the other end of the fixed material drop pipe (1) and is in communication with the fixed material drop pipe (1), and the variable material drop pipe (3) is rotatably connected to the fixed material drop pipe (1); A driving mechanism (4) is connected to the variable drop tube (3) and is used to drive the variable drop tube (3) to rotate relative to the fixed drop tube (1) so as to change the curve of the drop tube.

2. A variable curve drop tube as claimed in claim 1, characterized in that: It also comprises a fixed platform (7) connected to the fixed blanking tube (1), and the driving mechanism (4) is arranged on the fixed platform (7) and is rotatably connected to the variable blanking tube (3).

3. A variable curve drop tube as claimed in claim 2, characterized in that: The driving mechanism (4) is a telescopic rod (41), one end of which is rotatably connected to the fixed platform (7), and the other end of which is rotatably connected to the variable blanking tube (3), and is used to drive the variable blanking tube (3) to rotate.

4. A variable curve drop tube as claimed in claim 1, characterized in that: An adjusting baffle (6) is provided at the end of the variable drop pipe (3) away from the fixed drop pipe (1), and the adjusting baffle (6) is used to block the material so that the material flows out from the discharge end at a set angle.

5. A variable curve drop tube as claimed in claim 2 or 3, characterized in that: The fixed drop pipe (1) comprises an inlet section (11) and a first branch section (121) and a second branch section (122) connected thereto, wherein the first branch section (121) and the second branch section (122) are both connected to the variable drop pipe (3).

6. A variable curve drop tube as claimed in claim 5, characterized in that: It also comprises a head protection cover (8), which is arranged on the inlet section (11) of the fixed drop pipe (1) and has an opening for the discharge end of the transport mechanism (2) to extend into.

7. A variable curve drop tube as claimed in claim 6, characterized in that: A diversion component (5) is provided inside the head shield (8), and the diversion component (5) is used to divert the material transported by the transport mechanism (2) so that the material enters the first branch section (121) or the second branch section (122).

8. A variable curve drop tube as claimed in claim 7, characterized in that: The flow diversion component (5) comprises: An arc-shaped splitter plate (51) disposed inside the head shield (8); A rotating shaft (52) is rotatably connected to the head shield (8) and is connected to the arc-shaped splitter plate (51). The rotating shaft (52) is used to adjust the inclination angle of the arc-shaped splitter plate (51) by rotation.

9. A variable curve drop tube as claimed in claim 5, characterized in that: The fixed platform (7) is provided with two through holes for the first branch segment (121) and the second branch segment (122) to pass through; the diameter of the variable blanking tube (3) is larger than the diameter of the first branch segment (121) and the second branch segment (122); the variable blanking tube (3) is respectively sleeved on the outer side of the ends of the first branch segment (121) and the second branch segment (122) passing through the fixed platform (7); the upper end of the variable blanking tube (3) is rotatably connected to the fixed platform (7).

10. A bulk material conveying device, characterized in that: It comprises a variable curve drop tube as described in any one of claims 1-9.

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