Material level detection device for buffer hopper of coal bunker center feeder

Abstract

The utility model relates to the technical field of high and low coal level measurement of coal bunkers of thermal power plants, and discloses a coal bunker center feeder buffer hopper material level detection device which comprises a flange plate used for being installed on the side wall of a buffer hopper. One end of the overturning rod extends into the buffer hopper and is connected with a supporting rod, an included angle is formed between the supporting rod and the overturning rod, the end, away from the overturning rod, of the supporting rod is connected with a coal falling pressing plate, the coal falling pressing plate is used for abutting against the top face of a coal seam in the buffer hopper, and the end, away from the supporting rod, of the overturning rod is connected with a switch blocking piece; an elastic piece is arranged between the overturning rod and the flange plate; according to the utility model, the approach switch is arranged on the flange plate and is positioned on the moving track of the switch catch, the approach switch is triggered by mechanically driving the switch catch, the action is reliable, the structure is simple, the installation is convenient, and the adaptation range of coal types is wide.

Description

Technical Field

[0001] The utility model relates to the technical field of high and low measurement of coal bin coal level in thermal power plants, in particular to a coal level detection device for a buffer hopper of a coal bin central feeder. Background Art

[0002] A thermal power plant, abbreviated as a thermal power station, is a factory that uses combustibles (such as coal) as fuel to produce electric energy. The buffer hopper is an extremely important link in the coal combustion production and transportation process of a thermal power plant. It is located at the throat position and plays a very important role in regulating and buffering the transportation of coal.

[0003] At present, the type of the coal level gauge for the buffer hopper of the coal bin central feeder all adopts a Yin fork type coal level gauge, whose working reliability is extremely low and the maintenance cost is relatively high, seriously affecting the safe operation of the central feeder and the coal pulverizing system. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a coal level detection device for a buffer hopper of a coal bin central feeder, aiming to solve or improve at least one of the above technical problems.

[0005] To achieve the above purpose, the utility model provides the following scheme: The utility model provides a coal level detection device for a buffer hopper of a coal bin central feeder, including:

[0006] A flange plate for installing on the side wall of the buffer hopper;

[0007] A turning rod rotatably matched with the flange plate. One end of the turning rod extends into the buffer hopper and is connected with a support rod. An included angle is formed between the support rod and the turning rod. The end of the support rod far away from the turning rod is connected with a coal dropping pressing plate, and the coal dropping pressing plate is used to abut against the top surface of the coal seam in the buffer hopper. The end of the turning rod far away from the support rod is connected with a switch baffle, and an elastic member is arranged between the turning rod and the flange plate;

[0008] A proximity switch is arranged on the flange plate, and the proximity switch is located on the moving track of the switch baffle.

[0009] Optionally, the elastic member includes a first limiting plate, a second limiting plate and a spring. The first limiting plate is connected with the flange plate, the second limiting plate is connected with the turning rod, and the spring is arranged between the first limiting plate and the second limiting plate.

[0010] Optionally, the elastic member further includes a guide rod. One end of the guide rod is connected with the second limiting plate, and the guide rod slidably penetrates through the first limiting plate.

[0011] Optionally, the guide rod is arranged inside the spring.

[0012] Optionally, the guide rod is arc-shaped, and the arc axis of the guide rod is coaxially arranged with the axis of the flipping rod.

[0013] Optionally, a limiting rod is connected to the flange plate. The limiting rod is located on the side of the second limiting plate away from the spring, and the limiting rod is used to abut against the second limiting plate.

[0014] Optionally, a sealing bearing is arranged between the flange plate and the flipping rod.

[0015] Optionally, a housing is connected to the flange plate, and the housing covers the elastic member.

[0016] Optionally, a bracket for installing the proximity switch is arranged on the housing.

[0017] Optionally, an avoidance hole for the flipping rod to pass through is formed in the housing.

[0018] The following technical effects are disclosed by the present utility model: By using the coal dropping pressing plate to abut against the top surface of the coal seam in the buffer hopper, when the coal seam gradually decreases, the flow of the coal stream drives the coal dropping pressing plate to rotate downward simultaneously against the elastic member, the coal dropping pressing plate drives the flipping rod to rotate, and the switch flap at the end of the flipping rod rotates accordingly. When the switch flap rotates to the proximity switch, the proximity switch is triggered to act, realizing the alarm of the material level in the buffer hopper of the central feeder. By adopting the mechanical drive mode of the switch flap to trigger the proximity switch, the action is reliable, the structure is simple, the installation is convenient, and it is applicable to a wide range of coal types. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0020] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 is a schematic diagram of the elastic member structure of the present utility model;

[0022] Figure 3 is a schematic diagram of the flange plate and the flipping rod structure of the present utility model;

[0023] Figure 4 is a schematic diagram of the housing structure of the present utility model.

[0024] In the figure: 1, flange plate; 2, flipping rod; 3, support rod; 4, coal dropping pressing plate; 5, switch flap; 6, proximity switch; 7, first limiting plate; 8, second limiting plate; 9, spring; 10, guide rod; 11, limiting rod; 12, sealing bearing; 13, housing; 14, bracket; 15, avoidance hole. Specific Embodiments

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0026] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Referring to Figures 1-4 , the present utility model provides a buffer hopper level detection device for a coal bunker central feeder, including:

[0028] A flange plate 1 for being installed on the side wall of the buffer hopper, and the flange plate 1 is connected to the buffer hopper by screws;

[0029] A turning rod 2 is rotationally matched with the flange plate 1. One end of the turning rod 2 extends into the buffer hopper and is connected with a support rod 3. The turning rod 2 and the support rod 3 are fixed by welding. An included angle is formed between the turning rod 2 and the support rod 3. The end of the support rod 3 away from the turning rod 2 is connected with a coal falling pressing plate 4. The coal falling pressing plate 4 is used to abut against the top surface of the coal seam in the buffer hopper. The end of the turning rod 2 away from the support rod 3 is connected with a switch baffle 5. The turning rod 2 and the switch baffle 5 are connected by threads. An elastic member is arranged between the turning rod 2 and the flange plate 1;

[0030] A proximity switch 6 is arranged on the flange plate 1, and the proximity switch 6 is located on the moving track of the switch baffle 5.

[0031] By adopting the coal falling pressing plate 4 to abut against the top surface of the coal seam in the buffer hopper, when the coal seam gradually decreases, the flow of the coal flow drives the coal falling pressing plate 4 to rotate downward simultaneously against the elastic member. The coal falling pressing plate 4 drives the turning rod 2 to rotate. The switch baffle 5 at the end of the turning rod 2 rotates accordingly. When the switch baffle 5 rotates to the proximity switch 6, the proximity switch is triggered to act, realizing the level alarm of the buffer hopper of the central feeder. By adopting the mechanical method to drive the switch baffle 5 to trigger the proximity switch 6, the action is reliable, the structure is simple, the installation is convenient, and it is suitable for a wide range of coal types.

[0032] In a further optimized solution, the elastic member includes a first limit plate 7, a second limit plate 8, and a spring 9. The first limit plate 7 is connected to the flange plate 1, the second limit plate 8 is connected to the turning rod 2, and the spring 9 is arranged between the first limit plate 7 and the second limit plate 8.

[0033] Through the elastic energy storage of the spring 9 and the cooperation with the first limit plate 7 and the second limit plate 8, it is used to support the flipping rod 2. The spring 9 is connected to the second limit plate 8 through a bolt, and the flipping rod 2 and the second limit plate 8 are fixed by a pin key.

[0034] In a further optimized solution, the elastic member further includes a guide rod 10. One end of the guide rod 10 is connected to the second limit plate 8, and the guide rod 10 slidably penetrates through the first limit plate 7. The guide rod 10 is arranged inside the spring 9. The guide rod 10 is arc-shaped, and the arc axis of the guide rod 10 is coaxially arranged with the axis of the flipping rod 2.

[0035] The guide rod 10 is connected to the second limit plate 8 through a bolt, and the guide rod 10 guides the energy storage and energy release direction of the spring 9.

[0036] In a further optimized solution, a limit rod 11 is connected to the flange 1. The limit rod 11 is located on the side of the second limit plate 8 away from the spring 9, and the limit rod 11 is used to abut against the second limit plate 8.

[0037] The limit rod 11 is used to limit the position of the second limit plate 8.

[0038] In a further optimized solution, a sealing bearing 12 is arranged between the flange 1 and the flipping rod 2.

[0039] Furthermore, by arranging the sealing bearing 12, it can be ensured that there is no powder leakage at the flange 1 and no pulverized coal enters the sealing bearing 12.

[0040] In a further optimized solution, a housing 13 is connected to the flange 1. The housing 13 covers the elastic member, and the housing 13 is connected to the flange 1 through screws.

[0041] In a further optimized solution, a bracket 14 for installing the proximity switch 6 is arranged on the housing 13, and a fixing groove is arranged on the housing 13 for assembling the bracket 14.

[0042] Furthermore, structures such as the flange 1, the flipping rod 2, the support rod 3, the coal dropping pressure plate 4, the first limit plate 7, the second limit plate 8, the spring 9, the guide rod 10, and the limit rod 11 are preferably made of stainless steel, having the characteristics of corrosion resistance, moisture resistance, and abrasion resistance, and are suitable for use in high-dust harsh environments.

[0043] Furthermore, during installation, the coal dropping pressure plate 4 located in the buffer hopper should avoid the lower part of the buffer hopper feed port to prevent the impact of materials during use.

[0044] In a further optimized solution, an avoidance hole 15 for the flipping rod 2 to penetrate is formed on the housing 13.

[0045] Working principle: During operation, the coal flow in the buffer hopper of the central feeder flows from top to bottom. The flowing coal flow drives the coal dropping pressure plate 4 to move downward while overcoming the resistance of the spring 9. The coal dropping pressure plate 4 drives the turning lever 2 to rotate, and the switch stop piece 5 at the end of the turning lever 2 rotates accordingly. After the switch stop piece 5 rotates, it triggers the proximity switch 6 to act, realizing the alarm for the material level in the buffer hopper of the central feeder.

[0046] The utility model forms a mechanical material level inspection method through structures such as the turning lever 2, the support rod 3, the coal dropping pressure plate 4, the first limiting plate 7, the second limiting plate 8, the spring 9, the guiding rod 10, and the limiting rod 11. It can monitor the change of the coal level in the coal bunker buffer hopper in real time, provide timely and accurate alarm support, contribute to the reasonable control of the coal level in the buffer hopper, ensure the safe and stable operation of the central feeder, and has a relatively simple structure, so it is also relatively convenient to maintain. Once a failure occurs or calibration is required, technicians can quickly identify the cause and solve the problem. It can be widely applied to industries such as thermal power plants, chemical industries, grain storage, feed processing, plastic processing, and pharmaceutical industries, and can monitor the inventory of various raw materials in real time to ensure the smoothness of the production process.

[0047] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model.

[0048] The above-described embodiments are only used to describe the preferred mode of the present utility model, rather than to limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A buffer hopper material level detection device for a coal bunker central feeder, characterized in that, Including: A flange plate (1) for mounting on the side wall of the buffer hopper; A turning rod (2) rotatably fitted with the flange plate (1). One end of the turning rod (2) extends into the buffer hopper and is connected with a support rod (3). An included angle is formed between the support rod (3) and the turning rod (2). The end of the support rod (3) far from the turning rod (2) is connected with a coal dropping pressing plate (4). The coal dropping pressing plate (4) is used to abut against the top surface of the coal seam in the buffer hopper. The end of the turning rod (2) far from the support rod (3) is connected with a switch stop piece (5). An elastic member is arranged between the turning rod (2) and the flange plate (1); A proximity switch (6) arranged on the flange plate (1), and the proximity switch (6) is located on the moving track of the switch stop piece (5).

2. The coal bunker central feeder buffer hopper material level detection device according to claim 1, characterized in that: The elastic member includes a first limit plate (7), a second limit plate (8) and a spring (9). The first limit plate (7) is connected with the flange plate (1), the second limit plate (8) is connected with the turning rod (2), and the spring (9) is arranged between the first limit plate (7) and the second limit plate (8).

3. The coal bunker center feeder buffer hopper material level detection device according to claim 2, characterized in that: The elastic member further includes a guide rod (10). One end of the guide rod (10) is connected with the second limit plate (8), and the guide rod (10) slidably penetrates through the first limit plate (7).

4. The coal bunker center feeder buffer hopper material level detection device according to claim 3, characterized in that: The guide rod (10) is arranged inside the spring (9).

5. The coal bunker central feeder buffer hopper material level detection device according to claim 3, characterized in that: The guide rod (10) is arc-shaped, and the arc axis of the guide rod (10) is coaxially arranged with the axis of the turning rod (2).

6. The coal bunker center feeder buffer hopper material level detection device according to claim 2, wherein: A limit rod (11) is connected to the flange plate (1). The limit rod (11) is located on the side of the second limit plate (8) far from the spring (9), and the limit rod (11) is used to abut against the second limit plate (8).

7. The coal bunker central feeder buffer hopper material level detection device according to claim 1, characterized in that: A sealing bearing (12) is arranged between the flange plate (1) and the turning rod (2).

8. The buffer hopper material level detection device for the coal bunker central feeder according to claim 1, characterized in that: A housing (13) is connected to the flange plate (1), and the housing (13) covers the elastic member.

9. The coal bunker central feeder buffer hopper material level detection device according to claim 8, characterized in that: A bracket (14) for mounting the proximity switch (6) is arranged on the housing (13).

10. A buffer hopper material level detection device for a coal bunker central feeder according to claim 8, characterized in that: An avoidance hole (15) for the turning rod (2) to penetrate through is formed on the housing (13).

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