Variable-diameter screw conveyor groove body and manufacturing method thereof

Abstract

The invention discloses a reducing screw conveyor groove body and a manufacturing method thereof.The groove body comprises a main body part and a connecting flange, the main body part is defined by a conical groove bottom and special-shaped side walls symmetrically connected with the groove walls on the two sides of the conical groove bottom, and the connecting flange is provided with a connecting edge parallel to the center interface of the conical groove bottom; the outer side edge of the special-shaped side wall is connected through the connecting edge; wherein the main body part is provided with a first end and a second end which are opposite in the length direction, the diameter of the conical groove bottom is linearly changed from the first end to the second end, the central angle corresponding to the first end is 180 degrees, the central angle corresponding to the second end is set to be beta, and the central angles corresponding to the first end and the second end are gradually reduced; wherein the special-shaped side walls on the two sides are parallel at the first end, and the included angle between the special-shaped side walls at the second end is beta; wherein the included angle between the connecting edge and the special-shaped side wall at the first end is 180 degrees, the included angle between the connecting edge and the special-shaped side wall at the second end is alpha, and alpha is larger than beta, so that the resistance of the variable-diameter screw conveyor to start with materials can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of screw conveying equipment, and particularly to a variable-diameter screw conveyor trough and a manufacturing method thereof. Background Art

[0002] A screw conveyor is a machine that uses an electric motor to drive a screw to rotate and push materials to achieve the purpose of conveying. Among them, a variable-diameter screw conveyor is a special screw conveyor, and its characteristic is that the diameter of its conveying pipeline can change. This design enables the screw conveyor to adapt to different conveying requirements. Especially in the case of a long conveying distance or a complex conveying path, by changing the pipeline diameter, the conveying efficiency and the material flow performance can be optimized.

[0003] However, when the variable-diameter screw conveyor stops midway, the trough of the variable-diameter screw conveyor will be filled with materials, and the resistance of starting with materials is relatively large, which easily causes abnormalities or damages to mechanical components, such as abnormalities of the speed reducer, fracture of the pipe shaft, etc. At the same time, material blockage is likely to occur at the hanging bearing. Summary of the Invention

[0004] The embodiment of the present application provides a variable-diameter screw conveyor trough and a manufacturing method thereof, which can effectively reduce the resistance of starting with materials when the variable-diameter screw conveyor starts with materials, thereby protecting each mechanical component and reducing the phenomenon of material blockage during starting with materials.

[0005] The first aspect of the embodiment of the present application provides a variable-diameter screw conveyor trough, including a main body part and a connecting flange. The main body part is surrounded by a conical trough bottom and special-shaped side walls symmetrically connecting the two side walls of the conical trough bottom. The connecting flange has a connecting edge parallel to the central interface of the conical trough bottom, and the connecting flange connects the outer edge of the special-shaped side wall through the connecting edge;

[0006] Wherein the main body part has opposite first and second ends in the length direction, the diameter of the conical trough bottom changes linearly from the first end to the second end, the central angle corresponding to the first end is 180°, and it is set that the central angle corresponding to the second end is β, and the central angle corresponding to the first end to the second end gradually decreases;

[0007] Wherein the two special-shaped side walls are parallel at the first end, and the included angle between the two special-shaped side walls at the second end is β;

[0008] Wherein the included angle between the connecting edge and the special-shaped side wall is 180° at the first end and α at the second end, and α is greater than β.

[0009] In a possible implementation manner, α is less than 180° and greater than or equal to 146°.

[0010] In a possible implementation, β is greater than or equal to 26° and less than or equal to 67°.

[0011] In a possible implementation, the value of α is complementary to half of the value of β.

[0012] In a possible implementation, the connecting flange further includes a transition edge, which is connected to the outside of the connecting edge and is perpendicular to the connecting edge.

[0013] The second aspect of the embodiments of the present application provides a manufacturing method for a variable-diameter spiral conveyor trough body, which is used to manufacture the variable-diameter spiral conveyor trough body as described above. The manufacturing method sequentially includes the following steps:

[0014] S10, divide the main body part into n segments along the length direction in the form of the differential method, and make cross-sections perpendicular to the bottom bus of the conical trough bottom with the equal division points as the base points, forming n - 1 cross-sections, where n ≥ 2;

[0015] S20, starting from the first end or the second end, take one of the n segments as the first segment, draw the geometric figures of the two end faces of the first segment, and mark the predetermined geometric parameters to prepare for the development of the trough body base material. The predetermined geometric parameters include the side wall height, arc radius, central angle, arc length of the middle diameter of the arc, and segment length. Use the segment length as the conical cylinder height, and use the arc radii of the two end faces as the radii of the two ends of the conical cylinder respectively to manufacture the first conical cylinder;

[0016] S30, develop the first conical cylinder, intercept the semi-conical development drawing with the arc length of the middle diameter of the larger end of the first segment as the arc length of the larger end of the semi-conical development drawing, measure or calculate the central angle corresponding to the semi-conical development drawing, and then calculate the central angle corresponding to the arc of the smaller end of the first segment according to the characteristics of the circle;

[0017] S40, in the semi-conical development drawing, symmetrically mark the two end points on both sides of the small end of the semi-conical development drawing based on the central angle corresponding to the arc of the smaller end of the first segment, which are A and B respectively, and mark the two end points on both sides of the large end of the semi-conical development drawing as C and D respectively. The part formed by connecting ABCD is the developed figure of the conical trough bottom in the first segment;

[0018] S50, with point A as the center and the side wall height of the smaller end of the first segment as the radius, draw the first circle, with point D as the center and the side wall height of the larger end of the first segment as the radius, draw the second circle, then make tangents to be tangent to the first circle and the second circle at points E and F respectively, and then mirror the line segment EF with the center line of the sector as the symmetry line to obtain the line segment E’F’. Connect each point to obtain the polygon ABE’F’CDFE, which is the developed figure of the main body part of the first segment;

[0019] S60. Bend the developed drawing of the main body part by inputting the inner diameters at both ends of the first section into the numerical control bending machine respectively to obtain the main body part of the first section.

[0020] S70. By analogy, manufacture the main body parts of the remaining sections with reference to steps S10 - S60.

[0021] S80. Assemble and weld the n main body parts together in sequence, and then assemble and weld the connecting flange with the welded main body parts to obtain the variable - diameter screw conveyor trough body.

[0022] In a possible implementation manner, the base material of the trough body is sheet metal.

[0023] In a possible implementation manner, n = 3.

[0024] In a possible implementation manner, in step S30, unfold the first conical cylinder through sheet metal unfolding software.

[0025] Beneficial effects: Compared with the prior art, the variable - diameter screw conveyor trough body and its manufacturing method provided by this application can effectively reduce the resistance of the variable - diameter screw conveyor during starting with material, and the maximum resistance reduction effect is close to 30%. Thus, it can effectively protect each mechanical component during the starting with material of the variable - diameter screw conveyor, reduce the frequency of material blockage during starting with material, and ensure the conveying efficiency of the variable - diameter screw conveyor.

[0026] These and other objects, features, and advantages of the present invention are fully embodied through the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Shows a three - dimensional structural schematic diagram of the variable - diameter screw conveyor trough body of this application.

[0028] Figure 2 Shows a side - view structural schematic diagram of the variable - diameter screw conveyor trough body of this application viewed from the second end to the first end direction.

[0029] Figure 3 Shows a structural schematic diagram of each part after the variable - diameter screw conveyor trough body of this application is unfolded.

[0030] Figure 4 Shows a structural schematic diagram of different equal - divisions of the demarcation line in the manufacturing method of this application.

[0031] Figure 5 Shows a schematic diagram of the sheet - metal unfolding offset of different sectional boundary lines in the manufacturing method of this application.

[0032] Figure 6Shows the maximum offset curve graph of the boundary line of the developed drawing with respect to the number of segmented slots in the manufacturing method of the present application.

[0033] Figure 7 Shows the geometric schematic diagram of the first-segment slot in the manufacturing method of the present application.

[0034] Figure 8 Shows the developed schematic diagram of the semi-cone in the manufacturing method of the present application.

[0035] Figure 9 Shows the approximate developed drawing of the conical slot bottom in the manufacturing method of the present application.

[0036] Figure 10 Shows the developed schematic diagram of the main body part in the first-segment slot in the manufacturing method of the present application.

[0037] Figure 11 Shows the geometric schematic diagram of the second-segment slot in the manufacturing method of the present application.

[0038] Figure 12 Shows the developed schematic diagram of the main body part in the second-segment slot in the manufacturing method of the present application.

[0039] Figure 13 Shows the geometric schematic diagram of the third-segment slot in the manufacturing method of the present application.

[0040] Figure 14 Shows the developed schematic diagram of the main body part in the third-segment slot in the manufacturing method of the present application. Detailed implementation manners

[0041] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description of the present invention can be applied to other implementation manners, variations, improvements, equivalent manners, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0042] Those skilled in the art should understand that in the disclosure of the specification, the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention 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. Therefore, the above terms should not be construed as limitations on the present invention.

[0043] It is understood that the term "a" should be construed as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0044] Reference Figure 1 and Figure 2 In the first aspect of the embodiment of the present application, a variable-diameter spiral conveyor trough is provided, which includes a main body part and a connecting flange 10. The main body part is surrounded by a conical trough bottom 20 and special-shaped side walls 30 that symmetrically connect both sides of the conical trough bottom 20. The connecting flange 10 has a connecting edge 11 parallel to the central interface of the conical trough bottom 20. At the same time, the connecting flange 10 connects the outer sides of the special-shaped side walls 30 through the connecting edge 11.

[0045] The main body part has opposite first end 21 and second end 22 in the length direction. The diameter of the conical trough bottom 20 changes linearly from the first end 21 to the second end 22. The central angle corresponding to the first end 21 is 180°. At the same time, the central angle corresponding to the second end 22 is set as β, and the central angle corresponding to the first end 21 to the second end 22 gradually decreases, that is, β is less than 180°.

[0046] Both sides of the special-shaped side walls 30 are parallel at the first end 21. At the same time, the included angle between both sides of the special-shaped side walls 30 at the second end 22 is β.

[0047] The included angle between the connecting edge 11 and the special-shaped side walls 30 is 180° at the first end 21. At the same time, the included angle at the second end 22 is α, and α is greater than β.

[0048] Compared with the regular structural design of a conventional conical or cylindrical trough, this variable cross-section structural design of the trough will cause a component of the gravity of the material to form along the axial direction, thereby effectively reducing the frictional resistance of the material along the axial direction, that is, the extending direction of the trough. As a result, the resistance of the variable-diameter spiral conveyor during the starting with material can be effectively reduced, and further, various mechanical components can be effectively protected, the frequency of material blockage during the starting with material can be reduced, and thus the conveying efficiency of the variable-diameter spiral conveyor can be ensured. Through experimental research and actual use, it is proved that the maximum resistance reduction rate is close to 30%.

[0049] In one embodiment, α is less than 180° and greater than or equal to 146°.

[0050] In another embodiment, β is greater than or equal to 26° and less than or equal to 67°.

[0051] Some experimental data are as follows:

[0052] α β Drag reduction rate Example 1 146° 67° 27％ Example 2 156° 47° 16％ Example 3 167° 26° 5％

[0053] As can be seen from the above table, as the value of α decreases and the value of β increases, the resistance reduction rate gradually increases, and the resistance reduction effect is better.

[0054] However, as the value of α decreases, the value of β will correspondingly increase. When the groove width and the upper plane remain unchanged, that is, when the center of the variable-diameter screw conveyor is constant, as the β angle increases, the height of the trough bottom will rise, which will cause the cross-sectional area of the trough body to decrease, and the material accumulation volume of the corresponding cross-section will decrease accordingly. This will to a certain extent affect the conveying efficiency of the variable-diameter screw conveyor. Therefore, it is necessary to find the best balance range between reducing resistance and ensuring conveying efficiency. The value of β should not be too large or too small.

[0055] Further preferably, α is complementary to half of β. In this way, the complementarity of α and half of β will satisfy the geometric relationship of the Pythagorean theorem, which is conducive to the interception and drawing of the differential cross-section of the trough body during the manufacturing process of the trough body. Therefore, preferably, in Embodiments 1-3, the values of α are 146.6°, 156.35°, and 167.13° respectively, and correspondingly, the values of β are 66.8°, 47.3°, and 25.74° respectively.

[0056] In one embodiment, the connecting flange 10 further includes a transition edge 12, wherein the transition edge 12 is connected to the outside of the connecting edge 11 and is perpendicular to the connecting edge 11.

[0057] The second aspect of the embodiments of the present application provides a manufacturing method for a variable-diameter screw conveyor trough body for manufacturing the variable-diameter screw conveyor trough body as described above. Refer to Figures 1 to 14 , the manufacturing method successively includes the following steps:

[0058] First, after each part of the trough body is unfolded, as Figure 3 shown, where the tapered trough bottom 20 is unfolded into a thin fan shape, and the central angles corresponding to the inner and outer arcs of the thin fan shape are not equal, resulting in the connection line of the inner and outer arc edges deviating from the edge line of the workpiece. Therefore, when the plate is bent and formed, the two side edges cannot achieve an ideal effect. Thus, first, the trough body is divided into multiple segments by the differential method, specifically as follows:

[0059] S10, the main body part is evenly divided into n segments along the length direction in the form of the differential method, and cross-sections perpendicular to the trough bottom bus of the tapered trough bottom 20 are made with the equal division points as the base points, forming n - 1 cross-sections, n≥2. Since the central angles corresponding to the large and small arcs at both ends in the unfolded graph of each segment of the trough body differ little, the more segments there are, the smaller this difference will be, and it will be closer to the arc cone with the same central angle, as Figure 4 and Figure 5As shown, in addition, according to the segmented measurement results, various production costs are calculated simultaneously, and the maximum offset curve graph of the segmented number of the tank body and the boundary line of the developed drawing as shown in Figure 6 is obtained. It is concluded that it is the most economical when the tank body is manufactured and formed in three segments, so n is preferably 3. Subsequently, the construction is carried out taking the tank body of the BLS30 type variable-diameter screw conveyor as an example;

[0060] S20, starting from the first end 21 or the second end 22, take one of the n segments as the first segment. As an example, the first segment is taken starting from the first end 21 as the large end, draw the geometric figures of the two end faces of the first segment, and mark the predetermined geometric parameters to prepare for the development of the base material of the tank body, where the predetermined geometric parameters include the side wall height, the arc radius, the central angle, the arc length of the middle diameter of the arc, and the segment length, as Figure 7 shown in the following table:

[0061]

[0062] In addition, taking the segment length of the first segment as the cone barrel height, and taking the arc radii of the two end faces (i.e., 157, 126) as the radii of the two ends of the cone barrel respectively, make the first cone barrel;

[0063] S30, unfold the first cone barrel, and take the arc length of the middle diameter of the arc at the larger end of the first segment (i.e., 503) as the arc length at the larger end of the semi-cone unfolded drawing to intercept and obtain the semi-cone unfolded drawing, as Figure 8 shown. Measure or calculate that the central angle corresponding to the semi-cone unfolded drawing is 8.16°, and then calculate according to the characteristics of the circle that the central angle corresponding to the arc at the smaller end of the first segment is 7°;

[0064] The calculation method is as follows: According to the characteristics of the circle, it can be known that the arc length is proportional to its corresponding central angle. 154.26 / 180 = x / 8.16, where 154.26 is the central angle of section 1 and 180 is the central angle of the left end face. Thus, it can be calculated that the central angle corresponding to the arc at the smaller end of the first segment after unfolding is x = 7°;

[0065] S40, in the semi-cone unfolded drawing, combined with Figure 9 , based on the central angle corresponding to the arc at the smaller end of the first segment (i.e., 7°), symmetrically mark the two endpoints on the small end of the semi-cone unfolded drawing, which are A and B respectively, and mark the two endpoints on the large end of the semi-cone unfolded drawing as C and D respectively. The part formed by connecting ABCD is the unfolded figure of the conical tank bottom 20 in the first segment, that is, the figure formed by surrounding the sector ABCD. At this time, cut off the part outside the two points A and B that is not surrounded;

[0066] S50, combined with Figure 10, with point A as the center, draw a first circle with the side wall height of the smaller end in the first section (i.e., 152) as the radius, and with point D as the center, draw a second circle with the side wall height of the larger end in the first section as the radius (i.e., 120). Then draw tangents that are tangent to the first circle and the second circle at points E and F respectively. Then, using the center line of the sector as the symmetry line, mirror the line segment EF to obtain the line segment E'F'. Connect each point to obtain the polygon ABE'F'CDFE, which is the developed view of the main body part of the first section. The parts surrounded by BCEF and BC E'F' are the special-shaped side walls 30 on both sides;

[0067] S60, input the inner diameters at both ends of the first section into the numerical control bending machine to bend the developed view of the main body part to obtain the main body part of the first section;

[0068] S70, and so on. Refer to steps S10 - S60 to manufacture the main body parts of the remaining sections. More specifically, borrow the arcs obtained from the expansion calculation of section 1 and repeat the above expansion calculation method to successively obtain the developed views of the latter two trough bodies, as Figures 11 to 14 shown. The relevant parameters of the second trough body are shown in the following table:

[0069]

[0070] The relevant parameters of the second trough body are shown in the following table:

[0071]

[0072] S80, successively assemble and weld the main body parts of n sections together, and then assemble and weld the connecting flange 10 with the welded main body parts to obtain the variable - diameter screw conveyor trough body.

[0073] In one embodiment, the base material of the trough body is sheet metal.

[0074] Further preferably, in step S30, expand the first cone by using sheet metal expansion software, such as Jinlin sheet metal expansion software.

[0075] It should be noted that the terms "first, second" in this application are only used for descriptive purposes, do not represent any order, and cannot be understood as indicating or implying relative importance. These terms can be interpreted as names.

[0076] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The function and structural principle of the present invention have been shown and explained in the embodiments. Without departing from the said principle, the embodiments of the present invention can have any deformation or modification.

Claims

1. Variable-diameter screw conveyor trough, characterized in that, It includes a main body part and a connecting flange. The main body part is surrounded by a conical groove bottom and special-shaped side walls symmetrically connecting the two side walls of the conical groove bottom. The connecting flange has a connecting edge parallel to the central interface of the conical groove bottom. The connecting flange connects the outer edges of the special-shaped side walls through the connecting edge; Wherein the main body part has opposite first and second ends in the length direction. The diameter of the conical groove bottom changes linearly from the first end to the second end. The central angle corresponding to the first end is 180°. Let the central angle corresponding to the second end be β, and the central angle corresponding to the first end to the second end gradually decreases; Wherein the two special-shaped side walls are parallel at the first end, and the included angle between the two special-shaped side walls at the second end is β; Wherein the included angle between the connecting edge and the special-shaped side wall is 180° at the first end and α at the second end, and α is greater than β.

2. The variable-diameter spiral conveyor trough according to claim 1, wherein α is less than 180° and greater than or equal to 146°.

3. The variable-diameter screw conveyor trough according to claim 2, characterized in that, β is greater than or equal to 26° and less than or equal to 67°.

4. The variable-diameter screw conveyor trough according to claim 3, wherein, The value of α and half of the value of β are complementary.

5. The variable-diameter screw conveyor trough according to claim 1, wherein The connecting flange further includes a transition edge. The transition edge is connected to the outside of the connecting edge and is perpendicular to the connecting edge.

6. A manufacturing method of the variable-diameter screw conveyor trough for manufacturing the variable-diameter screw conveyor trough according to any one of claims 1 to 5, characterized in that, The manufacturing method successively includes the following steps: S10, divide the main body part into n segments along the length direction in the form of the differential method. Make a cross-section perpendicular to the groove bottom busbar of the conical groove bottom with the equal division points as the base points, forming n - 1 cross-sections, n≥2; S20, start from the first end or the second end and take one of the n segments as the first segment. Draw the geometric figures of the two end faces of the first segment and mark the predetermined geometric parameters to prepare for the unfolding of the groove body base material. The predetermined geometric parameters include the side wall height, the arc radius, the central angle, the arc length of the middle diameter of the arc, and the segment length. Take the segment length as the height of the conical cylinder, and take the arc radii of the two end faces as the radii of the two ends of the conical cylinder respectively to make the first conical cylinder; S30, unfold the first conical cylinder. Take the arc length of the middle diameter of the larger end of the first segment as the arc length of the larger end of the semi-cone unfolded drawing to intercept the semi-cone unfolded drawing. Measure or calculate the central angle corresponding to the semi-cone unfolded drawing, and then calculate the central angle corresponding to the arc of the smaller end of the first segment according to the characteristics of the circle; S40, in the semi-cone unfolded drawing, symmetrically mark the two endpoints on the small end of the semi-cone unfolded drawing based on the central angle corresponding to the arc of the smaller end of the first segment, which are A and B respectively. Mark the two endpoints on the large end of the semi-cone unfolded drawing as C and D respectively. The part formed by connecting and surrounding ABCD is the unfolded figure of the conical groove bottom in the first segment; S50: With point A as the center, draw a first circle with the sidewall height of the smaller end in the first section as the radius. With point D as the center, draw a second circle with the sidewall height of the larger end in the first section as the radius. Then draw tangents that are tangent to the first circle and the second circle at points E and F respectively. Then, using the center line of the sector as the symmetry line, mirror the line segment EF to obtain the line segment E'F'. Connect the points to obtain the polygon ABE'F'CDFE, which is the developed view of the main body part of the first section. S60: Input the inner diameters at both ends of the first section into the numerical control bending machine to bend the developed view of the main body part to obtain the main body part of the first section. S70: By analogy, manufacture the main body parts of the remaining sections with reference to steps S10 - S60. S80: Assemble and weld the n main body parts together in sequence, and then assemble and weld the connecting flange with the assembled and welded main body parts to obtain the variable - diameter screw conveyor trough body.

7. The manufacturing method of the variable-diameter screw conveyor trough according to claim 6, characterized in that, The base material of the trough body is sheet metal.

8. The manufacturing method of the variable-diameter screw conveyor trough according to claim 7, characterized in that, n＝3。 9. The manufacturing method of the variable-diameter screw conveyor trough according to claim 8, characterized in that, In step S30, unfold the first cone through sheet metal unfolding software.

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