Air supply device of coal mill and coal pulverizing system

Abstract

The utility model relates to the technical field of coal mills, and provides an air supply device of a coal mill and a coal pulverizing system, the air supply device of the coal mill comprises a hot primary air pipeline, a cold primary air pipeline, a mixed air supply pipe and a pneumatic isolation door; the hot primary air pipeline and the cold primary air pipeline are respectively connected to the mixed air supply pipe; the hot primary air pipeline and the mixed air supply pipe are each provided with a pneumatic isolation door, each pneumatic isolation door comprises an electromagnetic valve, an air cylinder, a manual valve and an isolation door body, a first working hole of each electromagnetic valve is connected with a first air inlet of the corresponding air cylinder, and compressed air is provided for a first cavity of the corresponding air cylinder through the corresponding first air inlet; and a second working hole of the electromagnetic valve is connected with a second air inlet of the air cylinder through a manual valve, and compressed air is provided for a second cavity of the air cylinder through the second air inlet, so that the air cylinder drives the isolation door body to be opened. By means of the device, the personal safety of workers in the overhaul work is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of coal mill technology, and in particular to a coal mill air supply device and pulverizing system. Background Technology

[0002] Currently, each coal mill requires an independent set of mixing air isolation doors and hot air isolation doors. During normal operation, both doors are fully open. However, when internal maintenance is required, both doors must be fully closed and locked to prevent leaks of hot air into the mill, which could cause injury or other accidents.

[0003] However, in existing coal mill air supply systems, the mixing air isolation door and the hot air isolation door are generally pneumatically controlled. Due to the isolation requirements of maintenance personnel, the mixing air isolation door and the hot air isolation door should be in the closed, locked, or locked position. During periods of solenoid valve de-energization, the air source may be accidentally activated or otherwise cause a potential air intake hazard, leading to the isolation door opening momentarily, resulting in hot air leakage and a safety accident. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an air supply device and pulverizing system for a coal mill, so as to solve the above-mentioned technical problem.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A coal mill air supply device includes: a hot primary air duct, a cold primary air duct, a mixed air supply duct, and a pneumatic isolation door; the hot primary air duct and the cold primary air duct are respectively connected to the mixed air supply duct; the pneumatic isolation door is respectively installed on the hot primary air duct and the mixed air supply duct, each pneumatic isolation door includes a solenoid valve, a cylinder, a manual valve, and an isolation door body; the first working port of the solenoid valve is connected to the first air inlet of the cylinder, and compressed air is supplied to the first chamber of the cylinder through the first air inlet, so that the cylinder drives the isolation door body to close; the second working port of the solenoid valve is connected to the second air inlet of the cylinder through the manual valve, and compressed air is supplied to the second chamber of the cylinder through the second air inlet, so that the cylinder drives the isolation door body to open.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, each of the pneumatic isolation doors also includes a first position detection component, a first indicator light, a second position detection component, and a second indicator light; when the manual valve is in the open position, the first indicator light is activated through the first position detection component; when the manual valve is in the closed position, the second indicator light is activated through the second position detection component.

[0008] The beneficial effects of adopting the above-mentioned further solution are: by setting a first position detection component and a second position detection component, the opening and closing status of the manual valve can be detected; and by setting a first signal light and a second signal light, the position of the manual valve can be indicated to the operator, thereby ensuring that the manual valve is in the correct position.

[0009] Furthermore, both the first position detection component and the second position detection component are microswitches, and the manual valve is connected to a protrusion for triggering the first position detection component and the second position detection component.

[0010] The beneficial effect of adopting the above-mentioned further solution is that a protrusion is connected to the manual valve for contact with the contacts of the micro switch to trigger the micro switch.

[0011] Furthermore, the outer edge of the protrusion has an arc-shaped structure.

[0012] The beneficial effect of adopting the above-mentioned further solution is that it ensures that the bump can smoothly trigger the first position detection component and the second position detection component.

[0013] Furthermore, each of the pneumatic isolation doors also includes a mounting bracket, on which the first position detection component, the first indicator light, the second position detection component, and the second indicator light are respectively connected.

[0014] Furthermore, the air inlet of the solenoid valve is connected to an air source.

[0015] The beneficial effect of adopting the above-mentioned further solution is that gas is supplied by the gas source, which in turn triggers the cylinder, causing the cylinder to drive the isolation door body to open and close.

[0016] Furthermore, the hot primary air duct includes a hot air main duct and a hot air supply duct. One end of the hot air supply duct is connected to the hot air main duct, and the other end of the hot air supply duct is connected to the mixed air supply duct. A hot air regulating baffle is installed on the hot air main duct.

[0017] The beneficial effect of adopting the above-mentioned further solution is that the hot air intake and flow rate can be controlled by the hot air regulating baffle.

[0018] Furthermore, the primary air duct includes a main cold air duct and a cold air supply duct. One end of the cold air supply duct is connected to the main cold air duct, and the other end of the cold air supply duct is connected to the mixed air supply duct. A cold air regulating damper is installed on the main cold air duct.

[0019] The beneficial effect of adopting the above-mentioned further solution is that the intake and flow rate of cold air can be controlled by adjusting the cold air damper.

[0020] Furthermore, a flow sensor is installed on the mixed air supply duct.

[0021] The beneficial effect of adopting the above-mentioned further solution is that the flow rate of the mixed air in the mixed air supply duct can be monitored by a flow sensor.

[0022] To solve the above-mentioned technical problems, this utility model also provides a pulverizing system, including the air supply device of a coal mill as described above.

[0023] The beneficial effects of this utility model are as follows: This utility model installs pneumatic isolation doors on both the hot primary air duct and the mixed air supply duct, and designs the control air path for the pneumatic isolation doors. By installing a manual valve between the second working hole of the solenoid valve and the second air inlet of the cylinder, the problem of incomplete isolation caused by factors such as instantaneous air intake on the "release" side or partial air leakage in the cylinder is completely solved, eliminating the safety hazard of internal hot air leakage and ensuring the personal safety of personnel during maintenance work. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an air supply device for a coal mill according to the present invention;

[0025] Figure 2 This is a cylinder connection diagram of the air supply device for a coal mill according to the present invention;

[0026] Figure 3 This is an installation diagram of the manual valve of the air supply device for a coal mill according to this utility model.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Mixing air supply duct; 2. Solenoid valve; 3. Cylinder; 4. Manual valve; 5. Isolation door body; 6. First working hole; 7. First air inlet; 8. Second working hole; 9. Second air inlet; 10. First position detection component; 11. First indicator light; 12. Second position detection component; 13. Second indicator light; 14. Protrusion; 15. Mounting bracket; 16. Air inlet; 17. Hot air main duct; 18. Hot air supply duct; 19. Hot air regulating damper; 20. Cold air main duct; 21. Cold air supply duct; 22. Cold air regulating damper; 23. Coal mill. Detailed Implementation

[0029] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0030] like Figure 1As shown, this embodiment provides an air supply device for a coal mill, including: a hot primary air duct, a cold primary air duct, a mixed air supply duct 1, and a pneumatic isolation door; the hot primary air duct and the cold primary air duct are respectively connected to the mixed air supply duct 1; the pneumatic isolation door is respectively installed on the hot primary air duct and the mixed air supply duct 1, each pneumatic isolation door including a solenoid valve 2, a cylinder 3, a manual valve 4, and an isolation door body 5; the first working port 6 of the solenoid valve 2 is connected to the first air inlet 7 of the cylinder 3, and compressed air is supplied to the first chamber of the cylinder 3 through the first air inlet 7, so that the cylinder 3 drives the isolation door body 5 to close; the second working port 8 of the solenoid valve 2 is connected to the second air inlet 9 of the cylinder 3 through the manual valve 4, and compressed air is supplied to the second chamber of the cylinder 3 through the second air inlet 9, so that the cylinder 3 drives the isolation door body 5 to open.

[0031] When compressed air is introduced into the first chamber of cylinder 3 through the first working hole 6 of solenoid valve 2 and the first air inlet 7 of cylinder 3, cylinder 3 moves, causing the isolation door body 5 to close. When compressed air is introduced into the second chamber of cylinder 3 through the second working hole 8 of solenoid valve 2 and the second air inlet 9 of cylinder 3, cylinder 3 moves in the opposite direction, causing the isolation door to open. When manual valve 4 is open, gas can normally enter through the second air inlet 9 of cylinder 3, thereby controlling the opening of the isolation door body 5. When manual valve 4 is closed, even if gas is introduced due to accidental operation, the gas will be isolated by manual valve 4, preventing the gas from entering cylinder 3 through the second air inlet 9, thus ensuring the tight isolation of the isolation door body 5.

[0032] like Figure 2 As shown, in this embodiment, for each pneumatic isolation door, there are two cylinders 3. Both cylinders 3 are connected to the isolation door body 5 and are used to jointly control the opening and closing of the isolation door body 5. The first air inlet 7 of both cylinders 3 is connected to the first working hole 6 of the solenoid valve 2, and the second air inlet 9 of both cylinders 3 is connected to the second working hole 8 of the solenoid valve 2 through the manual valve 4.

[0033] Optionally, in the embodiments, such as Figure 3As shown, each pneumatic isolation door further includes a first position detection component 10, a first indicator light 11, a second position detection component 12, and a second indicator light 13. When the manual valve 4 is in the open position, the first indicator light 11 is activated through the first position detection component 10; when the manual valve 4 is in the closed position, the second indicator light 13 is activated through the second position detection component 12. Both the first position detection component 10 and the second position detection component 12 are microswitches, and the manual valve 4 is connected to a protrusion 14 for triggering the first position detection component 10 and the second position detection component 12. The outer edge of the protrusion 14 has an arc-shaped structure.

[0034] Both the first position detection component 10 and the second position detection component 12 are normally open microswitches. The first position detection component 10 is electrically connected to the first indicator light 11, and the second position detection component 12 is electrically connected to the second indicator light 13, and is powered by a power source. The first position detection component 10 is installed at the position corresponding to when the manual valve 4 is fully open. When the manual valve 4 is fully open, the protrusion 14 contacts the contact of the first position detection component 10, triggering the first position detection component 10 to close, thereby turning on the first indicator light 11, which illuminates to indicate to the operator that the manual valve 4 is fully open.

[0035] The second position detection component 12 is installed at the position corresponding to when the manual valve 4 is in the fully closed state. When the manual valve 4 is fully closed, the protrusion 14 contacts the contact of the second position detection component 12, triggering the second position detection component 12 to close, thereby turning on the second indicator light 13. The second indicator light 13 lights up to indicate to the staff that the manual valve 4 has been fully closed.

[0036] By setting up a first position detection component 10 and a second position detection component 12, the opening and closing status of the manual valve 4 can be detected; and by setting up a first indicator light 11 and a second indicator light 13, the position of the manual valve 4 can be indicated to the operator, thereby ensuring that the manual valve 4 is in the correct opening and closing position. The first indicator light 11 and the second indicator light 13 are different colors for easy distinction, for example, the first indicator light 11 is red and the second indicator light 13 is green.

[0037] It should be noted that the first position detection component 10 and the second position detection component 12 can also be photoelectric switches, proximity switches, etc.

[0038] Optionally, in an embodiment, each of the pneumatic isolation doors further includes a mounting bracket 15, on which the first position detection component 10, the first indicator light 11, the second position detection component 12, and the second indicator light 13 are respectively connected.

[0039] Mounting bracket 15 provides mounting positions for the first position detection component 10, the first signal light 11, the second position detection component 12, and the second signal light 13. In this embodiment, mounting bracket 15 includes a base plate and side plates. The base plate is mounted on a structure such as a wall. The side plates have an L-shaped structure and are connected to the base plate. The first position detection component 10, the first signal light 11, the second position detection component 12, and the second signal light 13 are all mounted on the side plates.

[0040] Optionally, in this embodiment, the air inlet 16 of the solenoid valve 2 is connected to an air source. Gas is supplied by the air source, which triggers the cylinder 3, causing the cylinder 3 to open and close the isolation door body 5.

[0041] Optionally, in this embodiment, the primary hot air duct includes a main hot air duct 17 and a hot air supply duct 18. One end of the hot air supply duct 18 is connected to the main hot air duct 17, and the other end of the hot air supply duct 18 is connected to the mixed air supply duct 1. A hot air regulating damper 19 is installed on the main hot air duct 17. The hot air regulating damper 19 can control the intake and flow rate of the hot air.

[0042] Optionally, in this embodiment, the primary air duct includes a main cold air duct 20 and a cold air supply duct 21. One end of the cold air supply duct 21 is connected to the main cold air duct 20, and the other end of the cold air supply duct 21 is connected to the mixed air supply duct 1. A cold air regulating damper 22 is installed on the main cold air duct 20. The cold air regulating damper 22 can control the intake and flow rate of the cold air.

[0043] Optionally, in this embodiment, a flow sensor is installed on the mixing air supply duct 1. The flow sensor monitors the mixed air flow rate within the mixing air supply duct 1.

[0044] This embodiment provides a safe and reliable air supply device. Pneumatic isolation doors are installed on the hot air supply duct 18 and the mixed air supply duct 1, and the control air path of the pneumatic isolation doors is designed. By installing a manual valve 4 between the second working hole 8 of the solenoid valve 2 and the second air inlet 9 of the cylinder 3, the problem of incomplete isolation caused by factors such as instantaneous air intake on the "release" side or partial air leakage in the cylinder 3 is completely solved, eliminating the safety hazard of internal hot air leakage and ensuring the personal safety of personnel during maintenance.

[0045] Example 2

[0046] This embodiment provides a pulverizing system, including an air supply device for a coal mill as described in Embodiment 1.

[0047] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An air feeding device of a coal mill, characterized by, include: Hot primary air duct, cold primary air duct, mixed air supply duct (1) and pneumatic isolation door; The hot primary air duct and the cold primary air duct are respectively connected to the mixed air supply duct (1); the hot primary air duct and the mixed air supply duct (1) are respectively equipped with pneumatic isolation doors. Each pneumatic isolation door includes a solenoid valve (2), a cylinder (3), a manual valve (4) and an isolation door body (5). The first working hole (6) of the solenoid valve (2) is connected to the first air inlet (7) of the cylinder (3). Compressed air is supplied to the first chamber of the cylinder (3) through the first air inlet (7) so that the cylinder (3) drives the isolation door body (5) to close. The second working hole (8) of the solenoid valve (2) is connected to the second air inlet (9) of the cylinder (3) through the manual valve (4). Compressed air is supplied to the second chamber of the cylinder (3) through the second air inlet (9) so that the cylinder (3) drives the isolation door body (5) to open.

2. An air feeding device for a coal pulverizer according to claim 1, wherein Each of the pneumatic isolation doors further includes a first position detection component (10), a first indicator light (11), a second position detection component (12), and a second indicator light (13); when the manual valve (4) is in the open position, the first indicator light (11) is activated through the first position detection component (10); when the manual valve (4) is in the closed position, the second indicator light (13) is activated through the second position detection component (12).

3. An air feeding device for a coal mill as claimed in claim 2, wherein Both the first position detection component (10) and the second position detection component (12) are micro switches, and the manual valve (4) is connected to a protrusion (14) for triggering the first position detection component (10) and the second position detection component (12).

4. An air feeding device for a coal pulverizer according to claim 3, wherein The outer edge of the protrusion (14) has an arc-shaped structure.

5. An air feeding device for a coal pulverizer according to claim 2, wherein Each of the pneumatic isolation doors also includes a mounting bracket (15), on which the first position detection component (10), the first indicator light (11), the second position detection component (12), and the second indicator light (13) are respectively connected.

6. An air feeding device for a coal pulverizer according to claim 1, wherein The air inlet (16) of the solenoid valve (2) is connected to an air source.

7. An air feeding device for a coal pulverizer according to claim 1, wherein The hot primary air duct includes a hot air main duct (17) and a hot air supply duct (18). One end of the hot air supply duct (18) is connected to the hot air main duct (17), and the other end of the hot air supply duct (18) is connected to the mixed air supply duct (1). A hot air regulating baffle (19) is installed on the hot air main duct (17).

8. An air feeding device for a coal pulverizer according to claim 1, wherein The primary air duct includes a main cold air duct (20) and a cold air supply duct (21). One end of the cold air supply duct (21) is connected to the main cold air duct (20), and the other end of the cold air supply duct (21) is connected to the mixed air supply duct (1). A cold air regulating baffle (22) is installed on the main cold air duct (20).

9. An air feeding device for a coal pulverizer according to claim 1, wherein A flow sensor is installed on the mixed air supply duct (1).

10. A flour milling system characterized by, Includes an air supply device for a coal mill as described in any one of claims 1 to 9.

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