Shrimp Curve Drop Hopper

Abstract

The present invention provides a shrimp-curve drop hopper, including a tubular drop hopper, which is composed of a plurality of unit tube segments from top to bottom, and the cross-sectional profile of the tube cavity is circular as a whole and gradually decreases from top to bottom. The upper end of the drop hopper is connected to the drop port of the silo through the upper opening of the transition tube segment with a circular lower opening, and the upper opening of the transition tube segment is consistent with the contour of the drop port of the silo. The drop hopper and / or the tube core of the transition tube segment located on the upper part of the gate valve are arranged from top to bottom away from the drop port core. The drop hopper thus formed presents a shrimp-curve shape as a whole; the tube core of the drop hopper and / or the transition tube segment are arranged from top to bottom away from the drop port core, so that the position of the lower end discharge port of the drop hopper can be guided to the position of the coal feeder to be reached, thereby ensuring the space requirement between the coal mill that has been installed and fixed.

Description

Technical Field

[0001] The invention relates to a hopper of a material bin, in particular to a hopper of a raw coal bin. Background Art

[0002] The bottom of the silo for storing materials is connected to a hopper that extends downward as a whole. Under the action of gravity, the materials fall through the hopper to the conveyor and are transported downstream. For example, in the boiler pulverizing system of a power plant, the raw coal is stored in the silo. There is a coal hopper at the bottom of the silo. The lower end of the coal hopper is connected to the belt conveyor, which is usually called a coal feeder. The lower end of the coal hopper is provided with a gate valve located above the belt conveyor and arranged adjacent to it. Due to various reasons, the hopper is frequently blocked or the material is difficult to discharge due to arching, bridging or agglomeration of materials in the coal hopper. For this reason, a patent document entitled "A modular eccentric anti-blocking raw coal hopper suitable for circulating fluidized bed boilers" (CN 210000924) is disclosed in the Chinese patent literature. U) utility model patent, hereinafter referred to as D1, the disclosed scheme is "the raw coal hopper is a hollow square cone structure with a wide top and a narrow bottom, including an upper coal hopper 1, a middle coal hopper 2 and a lower coal hopper 3 arranged in sequence from top to bottom and welded together, the upper coal hopper 1 is a square structure, the middle coal hopper 2 is a four-sided pyramid structure with a large upper opening and a small lower opening and an eccentric structure, the lower coal hopper 3 is a hyperbolic structure as a whole, and the lower coal hopper 3 is welded from top to bottom by multiple groups of coal bins with the same height and the same cross-sectional shrinkage rate, and the cross-sections of the multiple groups of coal bins are all square." The above technical scheme has the following defects. First, the above scheme requires a huge amount of sheet material cutting work, and of course the welding work must also be huge. For example, the first coal bin 31 needs to cut four plates, and four welds need to be welded to weld the four plates. The second coal bunker 32 also has serious shape errors, and the welding difficulty of the first coal bunker 31 and the second coal bunker 32 increases, and the shape errors after welding are accumulated again; secondly, the bending and arc forming work of the hyperbolic plate surfaces of the first coal bunker 31, the second coal bunker 32, etc., which are the constituent units of the lower coal hopper 3, is huge; thirdly, the angles between adjacent pipe walls of all the same height sections are basically right angles, so a material clamping or material stagnation area has been formed, which consumes materials and occupies space, and not only does not play a positive role in smooth material falling, but has a counter-effect; fourthly, the pulverizing system suitable for D1 does not have a coal mill, that is, the position of the discharge port at the lower end of the lower coal hopper 3 does not need to take into account the setting of the coal mill, combined with Figure 3 As shown, only the middle coal hopper 2 has an eccentric shape, and the eccentric directions of the two middle coal hoppers 2 are the same, that is, the eccentric arrangement scheme has nothing to do with the distance between the discharge ports of the two lower coal hoppers 3. Figure 5 , 6For the pulverized coal boiler with coal mill installed, the above solution cannot be used, because the volume of the coal mill determines the distance between the two coal mills, and the horizontal position and distance between the silo and the two coal mills cannot be changed unless the coal mill is relocated and installed. In fact, there is no space in the plant to provide the changed installation position and space. Summary of the invention

[0003] The object of the present invention is to provide a shrimp curve drop hopper, which ensures smooth coal dropping while ensuring that the coal bin and the coal feeder are connected with each other.

[0004] A shrimp curve material drop hopper comprises a tubular material drop hopper, which is composed of a plurality of unit pipe segments from top to bottom. The cross-sectional contour of the tube cavity is circular as a whole and gradually decreases from top to bottom. The upper end of the material drop hopper is connected to the material drop port of a silo through the upper opening of a transition pipe segment with a circular lower opening. The upper opening of the transition pipe segment matches the contour of the material drop port of the silo. The pipe core of the material drop hopper and / or the transition pipe segment located on the upper part of the gate valve is arranged to deviate from the top to the bottom in the direction away from the core of the material drop port.

[0005] In the above scheme, the material-bearing bucket is composed of a number of unit pipe segments from top to bottom and the pipe cavity gradually decreases from top to bottom, so that the material-bearing bucket formed in this way presents a shrimp curve shape as a whole; the pipe core of the material-bearing bucket and / or the transition pipe segment is arranged from top to bottom away from the core of the material-bearing port, so that the position of the lower end discharge port of the material-bearing bucket can be guided to the position of the coal feeder to be reached, thereby ensuring the space requirement between the installed and fixed coal mill, that is, there is no need to change the installation position of the coal feeder and the coal mill, and the coal powder in the fixed coal bin can be guided to the coal mill, while ensuring the smooth discharge of the coal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is the XZ plane recognition diagram of the present invention;

[0007] Figure 2 It is the YZ plane recognition diagram of the present invention;

[0008] Figure 3 A schematic diagram of the three-dimensional structure of the present invention;

[0009] Figure 4 is a top view of the present invention;

[0010] Figure 5 , 6 It is a schematic diagram of two structural transition pipe sections in the present invention. DETAILED DESCRIPTION

[0011] A shrimp curve drop hopper includes a tubular drop hopper 10, which is composed of a plurality of unit tube segments 11 from top to bottom. The cross-sectional contour of the tube cavity is circular as a whole and gradually decreases from top to bottom. The upper end of the drop hopper 10 is connected to the drop port of a silo through the upper opening of a transition tube segment 20 with a circular lower opening. The upper opening of the transition tube segment 20 matches the contour of the drop port of the silo. The tube core of the drop hopper 10 and / or the transition tube segment 20 located on the upper part of the gate valve 2 is deviated from the top to the bottom and away from the core of the drop port.

[0012] In the above scheme, the material dropping bucket is composed of a plurality of unit pipe segments 10 from top to bottom and the tube cavity gradually decreases from top to bottom, so that the material dropping bucket 10 formed in this way presents a shrimp curve shape as a whole; the tube core of the material dropping bucket 10 and / or the transition pipe segment 20 is arranged from top to bottom away from the core of the material dropping port, so that the position of the lower end discharge port of the material dropping bucket 10 can be guided to the position of the coal feeder to be reached, thereby ensuring the space requirement between the coal mill that has been installed and fixed, that is, without changing the installation position of the coal feeder and the coal mill, the coal powder in the fixed coal bin can be guided to the coal mill, and at the same time, the smooth discharge of the coal powder can be ensured. The so-called shrimp curve in the above scheme means that the basic shape formed by the connection of a plurality of unit pipe segments 11 is similar to the shrimp curve, and the cross-section of the pipe segment presents a circular or semicircular outer contour that looks like a shrimp as a whole.

[0013] The tube core of the blanking tube bucket 10 and the transition tube section 20 and the core of the blanking port are located on the same plumb plane XZ plane, which is convenient for manufacturing.

[0014] The transition pipe section 20 is a square section with a square upper opening and a round lower opening, and the upper and lower end cores of the transition pipe section 20 are arranged offset. Since the discharge opening is basically square, the square transition pipe section 20 is set as the upper opening, and the eccentric arrangement of the transition pipe section 20 facilitates the position of the lower end discharge opening of the discharge pipe bucket 10 to the position of the coal feeder to be reached.

[0015] The transition pipe section 20 is circumferentially formed by four flat pipe walls and four arc-shaped pipe walls 25, and the flat pipe walls and the arc-shaped pipe walls 25 are arranged crosswise, thus forming a transition pipe section 20 structure with an upper part and a lower circle.

[0016] The first flat tube wall 21 and the second flat tube wall 22 are perpendicular to the XZ plane, the third flat tube wall 23 and the fourth flat tube wall 24 are mirror-symmetrical about the XZ plane, and the plumb plane YZ plane perpendicular to the XZ plane is perpendicular to the third flat tube wall 23 and the fourth flat tube wall 24 .

[0017] The peripheral wall generatrix of each unit pipe segment 11 is a straight line, and the projections of the peripheral wall generatrix of each unit pipe segment 11 and the outer wall line of the flat pipe wall on the XZ plane and the YZ plane together form an arc line. The arc line refers to an approximate arc line segment composed of multiple straight lines.

[0018] The angle between the first flat tube wall 21 and the YZ plane is less than the angle between the second flat tube wall 22 and the YZ plane. The curvature of the blanking tube bucket 10 is different at different locations, and such a flat tube wall angle is set to match the curvature trend at that location.

[0019] The peripheral contour of the flat tube wall is a parabola with an opening upward. During manufacturing, the tube body is first processed into a complete tube body with an arc tube wall 25, and then a U-shaped or parabolic notch is formed along the position of the flat tube wall, and then the flat tube wall is welded at the notch.

[0020] The peripheral contour of the flat tube wall is V-shaped with the opening upward. Four triangular flat plates are first made during manufacturing, and then one bottom side of the four triangular flat plates is closed upward, and the top angles are closed downward and located on the same arc, and the four bottom sides are closed to form a square mouth, and then the arc tube wall 25 is used to fill the gaps between the triangular plates.

[0021] The upper and lower ends of each unit pipe segment 11 are arranged eccentrically, and the eccentric distance between the upper and lower ends of each unit pipe segment 11 gradually decreases from top to bottom. The above solution solves the problem that the diameter of the lumen of the lower section gradually decreases, so the lumen of the lower section pipe body is arranged in the vertical direction as much as possible to reduce its inclined angle in order to obtain a smooth passage.

[0022] The included angle between the busbar on one side of each unit pipe segment 11 on the XZ plane and the tube core is greater than the included angle between the busbar on the other side of the pipe segment and the tube core, and the included angle between the busbar and the tube core between the two positions gradually increases from small to large along the X direction. In the above scheme, since the diameter of the upper tube body is larger, the included angle between the busbar on one side of each unit pipe segment 11 and the plumb plane can be slightly larger, and the busbar of the blanking pipe bucket 10 is more vertical, thereby constituting the blanking passage of the blanking pipe bucket 10 to be basically guaranteed in the vertical direction, that is, the more preferred scheme makes the contour of the horizontal plane projection of the lower end pipe opening of the blanking pipe bucket 10 located within the contour area of ​​the horizontal plane projection of the upper end pipe opening of the blanking pipe bucket 10.

Claims

1. A shrimp curve drop hopper, characterized in that: The invention comprises a tubular blanking pipe bucket (10), the blanking pipe bucket (10) is composed of a plurality of unit pipe segments (11) from top to bottom, the cross-sectional profile of the pipe cavity is circular as a whole and gradually decreases from top to bottom, the upper end of the blanking pipe bucket (10) is connected to the blanking port of the silo through the upper opening of a transition pipe segment (20) with a circular lower opening, the upper opening of the transition pipe segment (20) conforms to the contour of the blanking port of the silo, and the pipe core of the blanking pipe bucket (10) and / or the transition pipe segment (20) located above the gate valve (2) is arranged to deviate from the top to the bottom in a direction away from the core of the blanking port; The tube core of the blanking tube bucket (10) and the transition tube section (20) and the core of the blanking port are located on the same plumb plane XZ plane; The transition pipe segment (20) is a square-round segment with a square upper opening and a round lower opening, and the upper end core and the lower end core of the transition pipe segment (20) are arranged offset; The transition pipe segment (20) is circumferentially formed by four flat pipe walls and four arc-shaped pipe walls (25), wherein the flat pipe walls and the arc-shaped pipe walls (25) are arranged crosswise; The first flat tube wall (21) and the second flat tube wall (22) are perpendicular to the XZ plane, the third flat tube wall (23) and the fourth flat tube wall (24) are mirror-symmetrical about the XZ plane, and a plumb plane YZ plane perpendicular to the XZ plane is perpendicular to the third flat tube wall (23) and the fourth flat tube wall (24); The upper and lower openings of each unit pipe segment (11) are arranged eccentrically, and the eccentricity of the upper and lower openings of each unit pipe segment (11) gradually decreases from top to bottom; The contour of the horizontal plane projection of the lower end pipe opening of the blanking pipe bucket (10) is located within the contour area of ​​the horizontal plane projection of the upper end pipe opening of the blanking pipe bucket (10).

2. The shrimp curve drop hopper according to claim 1, characterized in that: The peripheral wall generatrix of each unit pipe segment (11) is a straight line, and the projections of the peripheral wall generatrix of each unit pipe segment (11) and the outer wall line of the flat pipe wall on the XZ plane and the YZ plane jointly form an arc line.

3. The shrimp curve drop hopper according to claim 1 or 2, characterized in that: The included angle between the first flat tube wall (21) and the YZ plane is less than the included angle between the second flat tube wall (22) and the YZ plane.

4. The shrimp curve drop hopper according to claim 3, characterized in that: The peripheral contour of the flat tube wall is in the shape of a parabola with an opening facing upward.

5. The shrimp curve drop hopper according to claim 3, characterized in that: The peripheral contour of the flat tube wall is in a V-shape with an opening facing upward.

6. The shrimp curve drop hopper according to claim 3, characterized in that: The included angle between the busbar on one side of each unit tube segment (11) on the XZ plane and the tube core is greater than the included angle between the busbar on the other side of the tube segment and the tube core, and the included angle between the busbar and the tube core between the two positions gradually increases from small to large along the X direction.

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