Reverse splicing hoisting steel funnel for coal blending bunker

Abstract

The utility model relates to the technical field of industrial metallurgical equipment, and provides a reverse splicing hoisting steel funnel for a coal blending bunker. The steel funnel comprises N splicing layers which are sequentially spliced from bottom to top in the vertical direction, the radial sizes of the N splicing layers are sequentially increased, and the Nth splicing layer is welded to the top of a silo; m splicing lifting lugs are uniformly distributed on the inner side wall of each splicing layer, and matched positioning mounting parts are arranged between the (i-1) th splicing layer and the ith splicing layer; each splicing layer comprises n first arc-shaped splicing plates and n second arc-shaped splicing plates, every two adjacent first arc-shaped splicing plates and second arc-shaped splicing plates are welded, and the curvature radiuses of the first arc-shaped splicing plates and the second arc-shaped splicing plates of each splicing layer are the same; and the curvature radiuses of the first arc-shaped splicing plate and the second arc-shaped splicing plate of the (i-1) th splicing layer are smaller than those of the first arc-shaped splicing plate and the second arc-shaped splicing plate of the ith splicing layer.

Description

Technical Field

[0001] The present application relates to the technical field of industrial metallurgical equipment, and in particular to a reverse splicing and hoisting steel funnel for a coal bunker. Background Art

[0002] The coal preparation silo complex is large in size (a total of 9 silos, with a diameter of 11 meters and a height of 35 meters). The main body is a concrete cylindrical structure. A hyperbolic steel funnel weighing 28 tons is installed at the bottom of each silo. The wall thickness is 12 mm and it is located at the bottom of the concrete silo. The surrounding area is the walls and columns supporting the silo.

[0003] The coal bunker steel hopper is a steel hopper structure used in coal bunkers, which is usually used to store and transport coal and other materials. The bottom of the coal bunker is a closed space with a frame structure (inner diameter 11.7 meters, net height 18.95 meters), and the upper diameter of the steel funnel is 8 meters, the lower diameter is 1 meter, and the height is 12 meters. The traditional installation method of the steel funnel is to construct it in the closed space at the bottom of the coal bunker. However, the narrowest part of the operating space is only 1.5 meters, and the construction space is small, making it difficult to hoist the steel funnel to the top of the silo and weld it.

[0004] Therefore, there is an urgent need to provide a technical solution to the above-mentioned deficiencies in the prior art. Summary of the invention

[0005] The purpose of the present application is to provide a reverse splicing and hoisting steel funnel for a coal distribution bunker, so as to solve or alleviate the problems existing in the above-mentioned prior art.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] The present application provides a reverse splicing hoisting steel funnel for coal distribution bunker, comprising: N splicing layers spliced ​​sequentially from bottom to top along the vertical direction, smooth transition welding between two adjacent splicing layers, radial dimensions of the N splicing layers increasing sequentially, and the Nth splicing layer welded to the top of the silo; each of the splicing layers is a funnel-shaped structure with a larger top and a smaller bottom; m splicing lifting ears are evenly distributed on the inner side walls of the splicing layers, and a matching positioning and mounting portion is provided between the i-1th splicing layer and the ith splicing layer;

[0008] Each of the splicing layers comprises n first arc-shaped splicing plates and n second arc-shaped splicing plates, and two adjacent first arc-shaped splicing plates and second arc-shaped splicing plates are welded; the first arc-shaped splicing plates and the second arc-shaped splicing plates of each of the splicing layers have the same curvature radius;

[0009] The curvature radius of the first curved splicing plate and the second curved splicing plate of the i-1th splicing layer is smaller than the curvature radius of the first curved splicing plate and the second curved splicing plate of the i-th splicing layer; wherein, m≥3; n≥1; i∈N; m, n, i, N are positive integers.

[0010] Preferably, dovetail slide rails are respectively arranged on both sides of the first arc-shaped splicing plate where it is connected to the second arc-shaped splicing plate, and the dovetail slide rails extend along the generatrix direction of the first arc-shaped splicing plate; dovetail slide grooves are respectively arranged on both sides of the second arc-shaped splicing plate where it is connected to the first arc-shaped splicing plate; the dovetail slide rails of the adjacent first arc-shaped splicing plate are slidably inserted into the dovetail slide grooves of the second arc-shaped splicing plate.

[0011] Preferably, the outer side wall of the first arc-shaped splicing plate from the second splicing layer to the Nth splicing layer and / or the outer side wall of the second arc-shaped splicing plate are provided with positioning and mounting parts extending along the generatrix direction.

[0012] Preferably, the outer side wall of the first arc-shaped splicing plate of the 1st splicing layer to the N-1th splicing layer and / or the outer side wall of the second arc-shaped splicing plate are provided with a positioning installation groove corresponding to the positioning installation piece.

[0013] Preferably, the inner side wall of each of the first arc-shaped splicing plates and each of the second arc-shaped splicing plates is provided with the splicing ear.

[0014] Preferably, the inner side wall of the Nth splicing layer is provided with a radial tensioning device, and the radial tensioning device is used to radially tension the first arc-shaped splicing plate and the second arc-shaped splicing plate of the Nth splicing layer.

[0015] Preferably, the radial tensioning device includes: a connecting pull plate and a pull rod assembly; there are 2n pull rod assemblies, one end of each of the pull rod assemblies is connected to the connecting pull plate, and the other end is connected to the first arc-shaped splicing plate or the second arc-shaped splicing plate of the Nth splicing layer, and the 2n pull rod assemblies are evenly distributed along the circumference of the connecting pull plate.

[0016] Preferably, the pull rod assembly includes: a tensioning adjustment member, a first connecting pull rod and a second connecting pull rod; the tensioning adjustment member is provided with a first threaded hole and a second threaded hole arranged relatively to each other, and the thread rotation directions of the first threaded hole and the second threaded hole are opposite; one end of the first connecting pull rod is connected to the connecting pull plate, and the other end is threadedly connected to the first threaded hole; one end of the second connecting railing is threadedly connected to the second threaded hole, and the other end is threadedly connected to the first arc splicing plate or the second arc splicing plate of the Nth splicing layer.

[0017] Beneficial effects:

[0018] The reverse splicing and hoisting steel funnel of the coal distribution bunker provided in the embodiment of the present application includes N splicing layers spliced ​​sequentially from bottom to top in the vertical direction, and smooth transition welding is performed between two connected splicing layers. The radial dimensions of the N splicing layers increase sequentially, and the Nth splicing layer is welded to the top of the silo, and each splicing layer is a funnel-shaped structure with a larger top and a smaller bottom; m splicing lifting ears are evenly distributed on the inner side wall of each splicing layer, and a matching positioning and mounting portion is arranged between the i-1th splicing layer and the i-th splicing layer; each splicing layer includes n first arc-shaped splicing plates and n second arc-shaped splicing plates, and two adjacent first arc-shaped splicing plates and second arc-shaped splicing plates are welded, and the curvature radius of the first arc-shaped splicing plate and the second arc-shaped splicing plate of each splicing layer is the same; the curvature radius of the first arc-shaped splicing plate and the second arc-shaped splicing plate of the i-1th splicing layer is smaller than the curvature radius of the first arc-shaped splicing plate and the second arc-shaped splicing plate of the i-th splicing layer. Therefore, the steel funnel of the coal bunker is modularly assembled in the axial and circumferential directions, each splicing layer is assembled and welded in the closed space at the bottom of the coal bunker, and the two adjacent splicing layers are reversely spliced ​​and hoisted from bottom to top, so that the steel funnel can be spliced ​​and hoisted in a narrow space, effectively improving the convenience and efficiency of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. Among them:

[0020] Figure 1 It is an elevation view of a coal distribution bunker body provided according to some embodiments of the present application;

[0021] Figure 2 A schematic diagram of the structure of a reversely spliced ​​hoisting steel funnel for a coal bunker according to some embodiments of the present application;

[0022] Figure 3 for Figure 2 The cross-sectional view of the reverse splicing and hoisting steel funnel of the coal bunker is shown;

[0023] Figure 4 for Figure 3 A partial view at A in the view shown;

[0024] Figure 5 for Figure 3 A partial view at B in the view shown;

[0025] Figure 6 A schematic diagram of the structure of an Nth splicing layer provided according to some embodiments of the present application;

[0026] Figure 7 for Figure 6 A schematic structural diagram of the first arc-shaped splicing plate in the Nth splicing layer is shown;

[0027] Figure 8 for Figure 6 A schematic diagram of the structure of the second arc-shaped splicing plate in the Nth splicing layer is shown;

[0028] Fig. 9 A schematic diagram of the structure of the i-th (2≤i≤N-1) splicing layer provided according to some embodiments of the present application;

[0029] Fig.10 for Fig. 9 The schematic diagram of the structure of the first arc-shaped splicing plate in the i-th (2≤i≤N-1) splicing layer is shown;

[0030] Fig.11 for Fig.10 The local schematic diagram of the C in the middle;

[0031] Fig.12 for Fig. 9 The schematic diagram of the structure of the second arc-shaped splicing plate in the i-th (2≤i≤N-1) splicing layer is shown;

[0032] Fig.13 This is a schematic structural diagram of a radial tensioning device provided according to some embodiments of the present application.

[0033] Description of reference numerals:

[0034] 100, splicing layer; 200, radial tensioning device;

[0035] 101. a first arc-shaped splicing plate; 102. a second arc-shaped splicing plate;

[0036] 201, first connecting rod; 202, tightening adjustment member; 203, second connecting rod; 204, connecting pull plate;

[0037] 901, splicing lifting ear; 902, positioning mounting piece; 903, positioning mounting groove; 904, dovetail type slide rail; 905, dovetail type slide groove. DETAILED DESCRIPTION

[0038] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application and does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as a part of an embodiment may be used in another embodiment to produce yet another embodiment. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the embodiments of the present invention should belong to the scope of protection of the embodiments of the present invention.

[0039] During the traditional steel funnel construction, usually after the overall welding is completed, it is fixed to the top of the silo by overall hoisting. Due to the narrow enclosed space at the bottom of the coal bunker, the workers' operating space is small, the overall hoisting construction is difficult, and there are huge construction blind spots, which can easily cause danger.

[0040] Based on this, an embodiment of the present application provides a reverse splicing and hoisting steel funnel for a coal distribution bunker, comprising: N splicing layers 100 spliced ​​sequentially from bottom to top along the vertical direction, with smooth transition welding between two adjacent splicing layers 100, the radial dimensions of the N splicing layers 100 increasing sequentially, and the Nth splicing layer 100 being welded to the top of the silo, and each splicing layer 100 being a funnel-shaped structure with a larger top and a smaller bottom.

[0041] In each splicing layer 100, m splicing ears 901 are evenly distributed along the circumferential direction on the inner wall, and a matching positioning and mounting portion is provided between the i-1th splicing layer 100 and the i-th splicing layer 100, so as to position the i-1th splicing layer 100 and the i-th splicing layer 100 during splicing through the positioning and mounting portion, thereby improving the accuracy of splicing.

[0042] Each splicing layer 100 includes n first arc splicing plates 101 and n second arc splicing plates 102. Two adjacent first arc splicing plates 101 and second arc splicing plates 102 are welded, and the first arc splicing plates 101 and second arc splicing plates 102 of each splicing layer 100 have the same radius of curvature. Therefore, the splicing layer 100 is split into a plurality of modular splicing plates, which facilitates the transportation of the modular splicing plates to the closed space at the bottom of the coal bunker. The modular splicing plates are assembled and welded in the closed space at the bottom of the coal bunker to form the splicing layer 100, instead of transporting the splicing layer 100 as a whole from the outside to the closed space at the bottom of the coal bunker. This greatly reduces the demand for transportation space when the splicing layer 100 is transported to the closed space at the bottom of the coal bunker, so that the transportation of the modular splicing plates can be achieved in a narrow transportation space.

[0043] The curvature radius of the first curved splicing plate 101 and the second curved splicing plate 102 of the i-1st splicing layer 100 is smaller than the curvature radius of the first curved splicing plate 101 and the second curved splicing plate 102 of the i-th splicing layer 100, so that after the i-th splicing layer 100 is assembled and welded in the closed space at the bottom of the coal bunker, the i-th splicing layer 100 is lifted by the fall chain, and the i-1st splicing layer 100 is assembled and welded below the lifted i-th splicing layer 100. After the assembly and welding of the i-1st splicing layer 100 is completed, the lifted i-th splicing layer 100 is lowered, and after the i-th splicing layer 100 is seated on the i-1st splicing layer 100, the i-th splicing layer 100 and the i-1st splicing layer 100 are smoothly welded.

[0044] Furthermore, the steel funnel of the coal distribution bunker is modularly assembled in the axial and circumferential directions respectively, each splicing layer 100 is assembled and welded in the closed space at the bottom of the coal distribution bunker, and the two adjacent splicing layers 100 are reversely spliced ​​and hoisted from bottom to top, so that the splicing and hoisting of the steel funnel are completed in a narrow space, which effectively improves the convenience and efficiency of construction.

[0045] In the embodiment of the present application, dovetail slide rails 904 are respectively provided on both sides where the first arc splicing plate 101 and the second arc splicing plate 102 are connected, and the dovetail slide rails 904 extend along the generatrix direction of the first arc splicing plate 101; dovetail slide grooves 905 are respectively provided on both sides of the second arc splicing plate 102 that are connected to the first arc splicing plate 101; the dovetail slide rails 904 of the adjacent first arc splicing plate 101 are slidably inserted and adapted to the dovetail slide grooves 905 of the second arc splicing plate 102. Thus, through the cooperation of the dovetail slide rails 904 and the dovetail slide grooves 905, the first arc splicing plate 101 and the second arc splicing plate 102 are assembled and positioned, effectively improving the assembly accuracy of the first arc splicing plate 101 and the second arc splicing plate 102, and then improving the overall assembly accuracy of the splicing layer 100.

[0046] Here, in order to further reduce the labor intensity of workers and increase the difficulty of assembling the first arc-shaped splicing plate 101 and the second arc-shaped splicing plate 102, a splicing ear 901 is welded and fixed on the inner wall of each first arc-shaped splicing plate 101 and each second arc-shaped splicing plate 102, and then, the first arc-shaped splicing plate 101 and the second arc-shaped splicing plate 102 are lifted by a fall chain to be moved and assembled, thereby improving the assembly efficiency of the first arc-shaped splicing plate 101 and the second arc-shaped splicing plate 102.

[0047] After the assembly of one splicing layer 100 is completed and the assembly and welding of the i-1 splicing layer 100 is completed, the raised i-th splicing layer 100 is lowered, and the i-th splicing layer 100 is located on the i-1 splicing layer 100. Among them, the outer side wall of the first arc splicing plate 101 and / or the outer side wall of the second arc splicing plate 102 of the second splicing layer 100 to the N-th splicing layer 100 is provided with a positioning and mounting member 902 extending along the generatrix direction, and then, during the descent of the i-th splicing layer 100, its positioning and mounting member 902 slides down along the outer side wall of the i-1 splicing layer 100, and the multiple positioning and mounting members 902 uniformly distributed along the circumferential direction on the i-th splicing layer 100 effectively ensure the centering effect of the i-th splicing layer 100 and the i-1-th splicing layer 100 during the descent of the i-th splicing layer 100.

[0048] Furthermore, the outer side wall of the first arc-shaped splicing plate 101 and / or the outer side wall of the second arc-shaped splicing plate 102 of the first splicing layer 100 to the N-1th splicing layer 100 is provided with a positioning installation groove 903 corresponding to the positioning installation piece 902. Thus, when the i-th splicing layer 100 is in the process of descending, its positioning installation piece 902 slides down along the positioning installation groove 903, and the auxiliary positioning effect of the positioning installation piece 902 is further improved through the cooperation between the positioning installation piece 902 and the positioning installation groove 903.

[0049] The process is repeated in sequence until the first splicing layer 100 and the second splicing layer 100 are assembled and welded, and the assembled steel funnel is lifted to the top of the silo by a fall chain for welding, thus completing the reverse splicing and hoisting of the entire steel funnel.

[0050] In the present application, a radial tensioning device 200 is provided on the inner side wall of the Nth splicing layer 100. The radial tensioning device 200 is used to radially tighten the first arc-shaped splicing plate 101 and the second arc-shaped splicing plate 102 of the Nth splicing layer 100, thereby effectively improving the centering accuracy of the modular splicing plates in the Nth splicing layer 100 and improving the modular assembly effect of the splicing layer 100.

[0051] In a specific example, the radial tensioning device 200 includes: a connecting pull plate 204 and a pull rod assembly. There are 2n pull rod assemblies, one end of each pull rod assembly is connected to the connecting pull plate 204, and the other end is connected to the first arc-shaped splicing plate 101 or the second arc-shaped splicing plate 102 of the Nth splicing layer 100, and the 2n pull rod assemblies are evenly distributed along the circumference of the connecting pull plate 204. In this way, the relative first arc-shaped splicing plate 101 or the second arc-shaped splicing plate 102 is tightened toward the center of the splicing layer 100, so that the force of each modular splicing plate of the splicing layer 100 is more uniform, and the unbalanced load condition of the splicing layer 100 is reduced.

[0052] In this embodiment, the tie rod assembly includes: a tension adjustment member 202, a first connecting tie rod 201 and a second connecting tie rod 203. The tension adjustment member 202 is provided with a first threaded hole and a second threaded hole arranged opposite to each other, and the thread rotation directions of the first threaded hole and the second threaded hole are opposite; one end of the first connecting tie rod 201 is connected to the connecting pull plate 204, and the other end is threadedly connected to the first threaded hole; one end of the second connecting tie rod 203 is threadedly connected to the second threaded hole, and the other end is threadedly connected to the first arc-shaped splicing plate 101 or the second arc-shaped splicing plate 102 of the Nth splicing layer 100. Thus, by rotating the tension adjustment member 202, the first connecting tie rod 201 and the second connecting tie rod 203 move toward each other or relative to each other, so as to realize radial adjustment of the two facing first arc-shaped connecting plates or second arc-shaped connecting plates. Here, the length of the first connecting rod 201 is greater than the length of the second connecting rod 203 , and the second connecting rod 203 is arranged close to the inner wall of the splicing layer 100 , so as to facilitate rotational adjustment of the tension adjustment member 202 .

[0053] During the reverse splicing and hoisting construction process of the reverse splicing and hoisting steel funnel of the coal bunker of the present application, first, the n first arc splicing plates 101 and the n second arc splicing plates 102 of the Nth splicing layer 100 are transported to the coal bunker for assembly and welding to form the nth splicing layer 100, and m splicing ears 901 are evenly welded along the circumference on the inner wall of the nth splicing layer 100. Among them, in the coal bunker construction area, a plurality of steel pipes are laid flat on the hardened ground outside the coal bunker with a spacing of 200 mm to form a simple roller device, and the modular splicing plates are hoisted and placed on the rollers by a car crane, and then manually pulled into the coal bunker for splicing. During splicing, the modular splicing plates are assembled on a horizontal concrete floor, and the modular splicing plates are symmetrically spliced ​​using the pre-arranged fall chains, welded into a ring, and a hyperbolic funnel (splicing layer 100) is formed.

[0054] In the present application, a plurality of lifting ears are symmetrically embedded in the bottom plate of the silo, and a plurality of fall chains are installed. A plurality of splicing lifting ears 901 are horizontally symmetrically welded on the steel funnel annular section (splicing layer 100). After the modular splicing plates are spliced ​​into annular sections (splicing layers 100), the Nth splicing layer 100 is lifted by the fall chain, and a positioning installation portion is welded on the outer wall of the Nth splicing layer 100.

[0055] Then, the n first arc-shaped splicing plates 101 and the n second arc-shaped splicing plates 102 of the N-1th splicing layer 100 are transported to the coal distribution bunker, and assembled and welded below the N-1th splicing layer 100 to form the N-1th splicing layer 100, and the positioning and installation part of the N-1th splicing layer 100 is welded on the outer wall. After the assembly and welding of the N-1th splicing layer 100 is completed, the N-1th splicing layer 100 is lowered, so that the positioning and installation part of the N-1th splicing layer 100 slides down along the outer wall of the N-1th splicing layer 100, and cooperates with the positioning and installation part of the N-1th splicing layer 100 until the bottom surface of the N-1th splicing layer 100 is located on the top surface of the N-1th splicing layer 100, and the joint of the N-1th splicing layer 100 and the N-1th splicing layer 100 is welded. Thereby, the positioning and installation part is used to perform auxiliary fixing and positioning when the steel funnel is vertically spliced, thereby ensuring the accuracy and welding quality of the interface when the funnel is butt-jointed.

[0056] The x splicing layers 100 are assembled and welded in a cycle; wherein x is the number of splicing layers 100 to be assembled and welded at one time determined according to the force on the splicing lifting lug 901 (x∈N, x is a positive integer); the x splicing layers 100 assembled and welded are lifted on the top of the silo by a fall chain for reverse lifting and welding; below the x splicing layers 100 assembled and welded, x splicing layers 100 are assembled and welded in a cycle again, and are lifted by a fall chain for reverse assembly and welding with the previous x splicing layers 100; the cycle is repeated until the assembly and welding of N splicing layers 100 is completed.

[0057] Therefore, the steel funnel of the coal bunker is modularly assembled along the axial and circumferential directions, each splicing layer is assembled and welded in the closed space at the bottom of the coal bunker, and the two adjacent splicing layers are reversely spliced ​​and hoisted from bottom to top, so that the splicing and hoisting of the steel funnel can be completed in a narrow space, which effectively improves the convenience and efficiency of construction.

[0058] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0063] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A steel funnel for reverse splicing and hoisting of coal bunker, characterized in that: include: n splicing layers are spliced ​​in sequence from bottom to top along the vertical direction, and two adjacent splicing layers are welded with smooth transition, the radial dimensions of the n splicing layers are increased in sequence, and the nth splicing layer is welded to the top of the silo; each splicing layer is a funnel-shaped structure with a larger top and a smaller bottom; The inner side wall of the splicing layer is evenly distributed with m splicing ears, and a matching positioning and mounting portion is provided between the i-1th splicing layer and the i-th splicing layer; Each of the splicing layers comprises n first arc-shaped splicing plates and n second arc-shaped splicing plates, and two adjacent first arc-shaped splicing plates and second arc-shaped splicing plates are welded; the first arc-shaped splicing plates and the second arc-shaped splicing plates of each of the splicing layers have the same curvature radius; The curvature radius of the first curved splicing plate and the second curved splicing plate of the (i-1)th splicing layer is smaller than the curvature radius of the first curved splicing plate and the second curved splicing plate of the i-th splicing layer; Where m≥3; n≥1; i∈N; m, n, i, N are positive integers.

2. The reverse splicing and hoisting steel funnel for coal bunker according to claim 1 is characterized in that: Two sides of the first arc-shaped splicing plate connected to the second arc-shaped splicing plate are respectively provided with dovetail-shaped slide rails, and the dovetail-shaped slide rails extend along the generatrix direction of the first arc-shaped splicing plate; Two sides of the second arc-shaped splicing plate connected to the first arc-shaped splicing plate are respectively provided with dovetail-shaped sliding grooves; The dovetail-shaped slide rail of the adjacent first arc-shaped splicing plate is slidably inserted into the dovetail-shaped slide groove of the second arc-shaped splicing plate.

3. The reverse splicing and hoisting steel funnel for coal bunker according to claim 1 is characterized in that: The outer side walls of the first arc-shaped splicing plates from the second splicing layer to the Nth splicing layer and / or the outer side walls of the second arc-shaped splicing plates are provided with positioning and mounting parts extending along the generatrix direction.

4. The reverse splicing and hoisting steel funnel for coal bunker according to claim 3 is characterized in that: The outer side walls of the first arc-shaped splicing plates from the 1st splicing layer to the N-1th splicing layer and / or the outer side walls of the second arc-shaped splicing plates are provided with positioning and mounting grooves corresponding to the positioning and mounting parts.

5. The reverse splicing and hoisting steel funnel for coal bunker according to claim 1 is characterized in that: The inner side wall of each of the first arc-shaped splicing plates and each of the second arc-shaped splicing plates is provided with the splicing lug.

6. The reverse splicing and hoisting steel funnel for coal bunker according to claim 1 is characterized in that: The inner side wall of the Nth splicing layer is provided with a radial tensioning device, and the radial tensioning device is used to radially tension the first arc-shaped splicing plate and the second arc-shaped splicing plate of the Nth splicing layer.

7. The reverse splicing and hoisting steel funnel for coal bunker according to claim 6 is characterized in that: The radial tensioning device comprises: a connecting pull plate and a pull rod assembly; There are 2n tie rod assemblies, one end of each tie rod assembly is connected to the connecting pull plate, and the other end is connected to the first arc-shaped splicing plate or the second arc-shaped splicing plate of the nth splicing layer. The 2n tie rod assemblies are evenly distributed along the circumference of the connecting pull plate.

8. The reverse splicing and hoisting steel funnel for coal bunker according to claim 7 is characterized in that: The tie rod assembly comprises: a tension adjustment member, a first connecting tie rod and a second connecting tie rod; The tension adjustment member is provided with a first threaded hole and a second threaded hole which are arranged opposite to each other, and the thread rotation directions of the first threaded hole and the second threaded hole are opposite to each other; One end of the first connecting rod is connected to the connecting pull plate, and the other end is threadedly connected to the first threaded hole; One end of the second connecting rod is threadedly connected to the second threaded hole, and the other end is threadedly connected to the first arc-shaped splicing plate or the second arc-shaped splicing plate of the Nth splicing layer.

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