A connection structure for solving the horizontal displacement of the coal hopper and the coal feeder
By installing a buffer connector between the coal hopper and the coal feeder, the problem of connection damage between the coal hopper and the coal feeder under horizontal earthquakes was solved, achieving structural safety and stable operation, and reducing equipment costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
- Filing Date
- 2025-04-30
- Publication Date
- 2026-07-03
AI Technical Summary
In existing technologies, the horizontal connection between the coal hopper and the coal feeder is prone to damage or breakage under horizontal earthquake conditions, leading to powder leakage and posing a safety hazard. Furthermore, conventional connection methods cannot absorb horizontal displacement.
A buffer connector, such as a three-dimensional expansion joint or a second coal hopper, is installed between the coal hopper and the coal feeder to absorb horizontal displacement between them, and the connection stability is achieved through flexible friction plates and bolt pre-tightening.
It effectively absorbs horizontal displacement, avoids damage to the connection between the coal hopper and the coal feeder, ensures the structural safety of the coal bunker and the safe operation of the unit, and reduces equipment investment.
Smart Images
Figure CN224454647U_ABST
Abstract
Description
Technical Field
[0001] This application relates to conventional coal bunkers in power plants, and more particularly to a connection structure for resolving horizontal displacement between the coal hopper and the coal feeder. Background Technology
[0002] As the quality of coal used in thermal power plants deteriorates, appropriate coal hopper anti-blocking measures are needed to improve and eliminate coal blockage in the raw coal bunker outlet chute when blending high-moisture, low-calorific-value coal. This aims to prevent unplanned unit shutdowns and reduced output caused by coal hopper blockage, improve unit operational reliability, and meet the demand for blending economical coal types. Current raw coal bunker clearing methods mainly include: activated clearing hoppers (wedge-shaped activated anti-blocking devices), central feeders, integrated anti-blocking vibrating coal hoppers with a chamfered profile, rotary clearing machines, and large-stroke hydraulic coal pushers (plows). Conventional coal hopper clearing devices are rigidly connected to the feeder (e.g., flanges or flexible connectors), absorbing only axial displacement, not horizontal displacement. However, with seismic isolation connection measures in place (reducing seismic response between coal bunkers, thus reducing investment and improving structural safety), the raw coal bunker does not move with the frame during horizontal earthquakes, but the feeder remains fixed on the operating floor. This results in horizontal displacement of the connection between the raw coal bunker and the coal feeder under horizontal earthquake conditions. Conventional coal feeder inlet connectors (flexible connectors) do not absorb horizontal displacement, causing damage or breakage of the connection between the coal hopper and the intermediate connection, resulting in powder leakage. If the breakage is large, it will cause a safety accident. Therefore, it is necessary to find a new connection method to ensure the safe operation between coal bunkers. Utility Model Content
[0003] The purpose of this application is to provide an economical and practical connection structure for solving the horizontal displacement of the coal hopper and the coal feeder.
[0004] This application discloses a connection structure for solving the horizontal displacement of the coal hopper and the coal feeder in a raw coal bunker. The raw coal bunker is equipped with an 0m layer, a running layer, and a belt conveyor layer. A coal mill is installed in the 0m layer. The coal feeder is installed in the running layer. The coal hopper and the raw coal bunker are installed above the running layer. The belt conveyor layer is installed above the raw coal bunker.
[0005] A buffer connector is provided between the coal feeder and the coal hopper. The buffer connector is configured to connect the coal feeder and the coal hopper and absorb horizontal displacement between them.
[0006] In a preferred embodiment, the buffer connector is configured as a three-dimensional expansion joint.
[0007] In a preferred embodiment, the length of the three-dimensional expansion joint is selected based on the possible horizontal displacement during a horizontal earthquake.
[0008] In a preferred embodiment, the three-dimensional expansion joint is disposed below the raw coal bunker.
[0009] In a preferred embodiment, the buffer connector is a second coal hopper.
[0010] In a preferred embodiment, the second coal hopper is configured with a large opening, and the coal hopper of the raw coal bunker is configured with a small opening.
[0011] In a preferred embodiment, the second coal hopper and the coal hopper of the raw coal bunker are connected by a sleeve connection.
[0012] In a preferred embodiment, the connection between the second coal hopper and the raw coal bunker is provided with a flexible friction plate.
[0013] In a preferred embodiment, the raw coal bunker is equipped with seismic isolation bearings.
[0014] In a preferred embodiment, the connection between the coal hopper of the raw coal bunker and the second coal hopper is pre-tightened with bolts.
[0015] The advantages of this application are:
[0016] (1) This application achieves horizontal separation between the raw coal bunker and the coal feeder by setting an additional buffer connector between the coal hopper and the coal feeder in the raw coal bunker, thereby ensuring the structural safety between the coal bunkers and the operational safety of the unit while reducing the investment in the coal hopper structure.
[0017] The specification of this application contains numerous technical features distributed across various technical solutions. Listing all possible combinations of these features (i.e., technical solutions) would make the specification excessively lengthy. To avoid this problem, the various technical features disclosed in the above-described utility model content, the various technical features disclosed in the following embodiments and examples, and the various technical features disclosed in the accompanying drawings can be freely combined to form various new technical solutions (all of which should be considered as already described in this specification), unless such a combination of technical features is technically infeasible. For example, one example discloses feature A+B+C, and another example discloses feature A+B+D+E. Features C and D are equivalent technical means that serve the same function, and technically only one needs to be used; they cannot be used simultaneously. Feature E can technically be combined with feature C. Therefore, the solution A+B+C+D should not be considered as already described due to technical infeasibility, while the solution A+B+C+E should be considered as already described. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of an embodiment using a three-dimensional expansion joint as a buffer connector according to this application;
[0019] Figure 2 This is a schematic diagram of the structure of an embodiment using a second coal hopper as a buffer connector according to this application;
[0020] Figure 3 This is an enlarged view of the connection between the coal hopper and the second coal hopper in an embodiment of the present application using the second coal hopper as a buffer connector.
[0021] Figure 4 This is a schematic diagram of the bolt hole structure for absorbing horizontal displacement as described in this application. Attached Figure Description
[0023] 1-Belt conveyor layer; 2-Transportation layer; 3-0m layer; 4-Flexible friction plate; 5-Second coal hopper; 6-Coal hopper; 7-Coal gate; 8-Three-dimensional expansion joint; 9-Coal feeder Detailed Implementation
[0024] Through in-depth research and extensive screening, the inventors of this utility model have developed a connection structure to solve the problem of horizontal displacement between the coal hopper and the coal feeder. Compared with the prior art, this application sets a buffer connector between the coal feeder and the coal hopper in the raw coal bunker, thereby enabling the coal hopper and the coal feeder to be horizontally separated, thus adapting to various working and disaster situations.
[0025] This application discloses a connection structure for solving the horizontal displacement of the coal hopper and the coal feeder in a raw coal bunker. The structure is characterized by the following: a 0m layer 3, a running layer 2, and a belt conveyor layer 1 are sequentially arranged upwards within the coal bunker; the 0m layer 3 is the portion of the coal bunker with a horizontal height of 0m, on which a coal mill is arranged; the coal feeder 9 is arranged on the running layer 2; the coal hopper 6 and the raw coal bunker are arranged above the running layer; and the belt conveyor layer 1 is arranged above the raw coal bunker.
[0026] A buffer connector is provided between the coal feeder 9 and the coal hopper 6. The buffer connector is configured to connect the coal feeder and the coal hopper and absorb the horizontal displacement between them.
[0027] Example 1
[0028] An embodiment of this application, for example Figure 1 As shown, specifically, this embodiment uses a three-dimensional expansion joint 8 as a buffer connector. The three-dimensional expansion joint 8 is configured between the inlet of the coal feeder 9 and the raw coal hopper, as shown in the figure. The length of the three-dimensional expansion joint 8 is selected based on the horizontal displacement, thus ensuring that no coal leakage occurs between the coal hopper and the coal feeder, guaranteeing the structural safety of the coal bunker and the operational safety of the unit.
[0029] Example 2
[0030] An embodiment of this application, for example Figure 2As shown, specifically, in this embodiment, a second coal hopper 5 is designed below the coal bunker. The interface sizes of the original coal bunker and the second coal hopper 5 are different; the original coal bunker has a smaller opening, while the second coal hopper 5 has a larger opening. They are connected by a larger opening fitting inside the smaller one, with an elliptical hole in the middle. The size of this hole takes into account horizontal displacement under horizontal seismic conditions. The intermediate seal between the original coal bunker and the second coal hopper uses a flexible friction plate to prevent coal dust from leaking into the environment. The connection between the original coal bunker and the second coal hopper 5 is pre-tightened with bolts, but not completely tightened. Thus, under horizontal seismic conditions, the original coal bunker and the second coal hopper 5 remain horizontally stationary, while the original coal bunker remains relatively still.
[0031] It should be noted that in this patent application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. In this patent application, if it refers to performing an action according to an element, it means performing the action at least according to that element, including two cases: performing the action only according to that element, and performing the action according to that element and other elements. Expressions such as "multiple," "repeatedly," and "various" include two, two times, two kinds, and more than two, more than two times, and more than two kinds.
[0032] This specification includes combinations of various embodiments described herein. Individual references to “one embodiment” or a particular embodiment, etc., do not necessarily refer to the same embodiment; however, these embodiments are not mutually exclusive unless indicated to be mutually exclusive or are readily apparent to those skilled in the art. It should be noted that the word “or” is used in a non-exclusive sense throughout this specification unless the context explicitly indicates or requires it.
[0033] All documents mentioned in this application are considered to be incorporated in their entirety into the disclosure of this application so that they can serve as a basis for modifications if necessary. Furthermore, it should be understood that after reading the foregoing disclosure of this application, those skilled in the art can make various alterations or modifications to this application, and these equivalent forms also fall under the protection claimed in this application.
Claims
1. A connecting structure for solving horizontal displacement of a coal hopper and a coal feeder, characterized in that, The connecting structure is configured inside the raw coal bunker, and the raw coal bunker is configured with an 0m layer, a running layer and a belt conveyor layer arranged sequentially upwards; the 0m layer is configured with a coal mill; the coal feeder is configured on the running layer; the coal hopper and the raw coal bunker are configured above the running layer; The conveyor belt layer is positioned above the raw coal bunker; A buffer connector is provided between the coal feeder and the coal hopper. The buffer connector is configured to connect the coal feeder and the coal hopper and absorb horizontal displacement between them.
2. The connection structure according to claim 1, characterized in that The buffer connector is configured as a three-dimensional expansion joint.
3. The connection structure according to claim 2, characterized in that The length of the three-dimensional expansion joint is selected based on the possible horizontal displacement during a horizontal earthquake.
4. The connection structure according to claim 2, characterized by The three-dimensional expansion joint is positioned below the raw coal bunker.
5. The connection structure according to claim 1, wherein The buffer connector is a second coal hopper, which is rigidly connected to the coal feeder.
6. The connection structure according to claim 5, characterized in that The second coal hopper is configured with a large opening, while the coal hopper of the raw coal bunker is configured with a small opening.
7. The connection structure according to claim 6, characterized in that The second coal hopper and the coal hopper of the raw coal bunker are connected by friction.
8. The connection structure according to claim 5, wherein The connection between the second coal hopper and the raw coal bunker is equipped with flexible friction plates.
9. The connection structure according to claim 5, wherein The raw coal bunker is equipped with seismic isolation bearings.
10. The connection structure according to claim 5, wherein The connection between the coal hopper of the raw coal bunker and the second coal hopper is pre-tightened with bolts.