Opening and closing device for coal mill pipeline

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By employing a drive mechanism, a fixed frame, a gate plate, and a limit switch assembly in the opening and closing device for the coal mill pipeline, especially by using a non-contact magnetic limit switch, the problems of unstable feedback signals and frequent damage of mechanical limit switches have been solved, thereby improving the operational reliability and maintenance economy of the coal mill.

CN223587326UActive Publication Date: 2025-11-25LIAONING DATANG INTERNATIONAL SHENDONG THERMAL POWER CO LTD

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Patent Information

Application Number: CN202423067391.7
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-12-12
Publication Date: 2025-11-25
Estimated Expiration: 2034-12-12

AI Technical Summary

Technical Problem

The mechanical limit switch feedback signal of the existing coal mill pipeline opening and closing device is unstable, and the mechanical limit switch is frequently damaged, which increases the maintenance workload and cost.

Method used

It adopts a drive mechanism, a fixed frame, a slide gate, and a limit switch assembly. The limit switch assembly includes a feedback magnet and a magnetic limit switch. It adopts a non-contact magnetic limit switch to avoid signal instability and mechanical impact damage caused by changes in the slide gate's travel.

Benefits of technology

This achieves stable feedback signals for the gate's positioning, reduces damage to limit switches, and improves the operational reliability and maintenance economy of the coal mill.

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Abstract

The utility model relates to the technical field of coal mills, in particular to an opening and closing device for a coal mill pipeline. The opening and closing device comprises a driving mechanism, a fixing frame, an insertion plate door and a limiting switch assembly, the first end of the fixing frame is connected with the fixed end of the driving mechanism, the second end of the fixing frame can be connected with the coal mill pipeline, and the movable end of the driving mechanism is connected with the insertion plate door to drive the insertion plate door to horizontally move so as to open or close an opening of the coal mill pipeline. The limiting switch assembly comprises a feedback magnet and two magnetic limiting switches, the two magnetic limiting switches are arranged on the fixing frame in a spaced mode and are in communication connection with the driving mechanism, and the feedback magnet is arranged on the plug board door. Due to the fact that the limit switch assembly is a non-contact type magnetic limit switch, the problem that an in-place feedback signal is unstable due to the stroke change of the plug board door is solved, and the problem that the limit switch is frequently damaged due to the fact that a mechanical limit switch is impacted by the opening and closing operation of the plug board door is solved.

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Description

TECHNICAL FIELD

[0001] The utility model relates to coal mill technical field especially relates to a kind of opening and closing device for coal mill pipeline. BACKGROUND

[0002] In prior art, the opening and closing device for coal mill pipeline is used on the powder feeding pipeline from the outlet of coal mill to the inlet of burner, which plays the role of cutting off the gas powder flow.

[0003] The existing pneumatic flap door of coal mill outlet uses mechanical limit switch, when the pressure of gas source changes slightly or the coal powder accumulates in the running channel of flap door, the stroke of pneumatic flap door will change accordingly, since the mechanical displacement error of mechanical limit switch is large, the feedback signal of pneumatic flap door is unstable. And since the mechanical limit switch is contact switch, the mechanical part of limit switch will be impacted when pneumatic flap door switch operates, which leads to frequent damage of limit switch, increases the maintenance workload and maintenance cost. UTILITY MODEL CONTENT

[0004] (I) technical problem to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of prior art, the utility model provides an opening and closing device for coal mill pipeline, which solves the technical problems of unstable feedback signal of mechanical limit switch on the opening and closing device for coal mill pipeline and frequent damage of mechanical limit switch.

[0006] (II) technical scheme

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the main technical scheme including:

[0008] The utility model embodiment provides an opening and closing device for coal mill pipeline, which comprises driving mechanism, fixed frame, flap door and limit switch assembly; the first end of fixed frame is connected with the fixed end of driving mechanism, and the second end of fixed frame can be connected with coal mill pipeline; the moving end of driving mechanism is connected with flap door, which drives flap door to move horizontally to open or close the opening of coal mill pipeline; limit switch assembly comprises feedback magnet and two magnetic limit switches, the two magnetic limit switches are arranged on fixed frame in interval and are in communication connection with driving mechanism, and feedback magnet is arranged on flap door.

[0009] Preferably, the magnetic limit switch comprises mounting plate, adjusting unit and magnetic limit switch body; the mounting plate is mounted on fixed frame, and the magnetic limit switch body is adjustably arranged on the mounting plate along the moving direction of flap door through adjusting unit.

[0010] Preferably, the adjusting unit comprises an adjusting plate, an adjusting rod and a nut; the adjusting plate is detachably connected with the mounting plate, a bottom end of the adjusting plate is provided with an adjusting groove for accommodating an end of the adjusting rod, the adjusting groove extends along a moving direction of the plug-in door; a top end of the adjusting plate is provided with a guide protrusion extending along the moving direction of the plug-in door, an opening groove is arranged on the magnetic limit switch body and is in sliding connection with the guide protrusion; the adjusting rod penetrates the adjusting plate, the magnetic limit switch body and the nut in sequence and is threadedly connected with the nut, and an end of the adjusting plate is located in the adjusting groove.

[0011] Preferably, the adjusting support is in Z-shaped structure, and the feedback magnet is arranged on the plug-in door through the adjusting support; a lower part of the feedback magnet is threadedly connected with a threaded hole of the adjusting support.

[0012] Preferably, the fixing frame comprises two fixing beams arranged in an up-down manner; first ends of the two fixing beams are connected with fixed ends of the driving mechanism, and second ends of the two fixing beams are connected with the coal mill pipeline; the magnetic limit switch is arranged on the upper fixing beam; and the plug-in door is located between the two fixing beams.

[0013] Preferably, a connecting flange is arranged on the coal mill pipeline; the connecting flange is located at an opening of the coal mill pipeline; and the two fixing beams are respectively connected with upper and lower ends of the connecting flange.

[0014] Preferably, the device further comprises a vibrator; and the vibrator is arranged at a middle part of the connecting flange.

[0015] Preferably, the driving mechanism is a hydraulic cylinder telescopic rod; and a moving end of the hydraulic cylinder telescopic rod is connected with the plug-in door.

[0016] (Three) beneficial effects

[0017] The beneficial effects of the utility model are:

[0018] The utility model discloses a coal mill pipeline opening and closing device, which comprises a driving mechanism, a fixing frame, a plug-in door and a limit switch assembly, a first end of the fixing frame is connected with a fixed end of the driving mechanism, a second end of the fixing frame can be connected with a coal mill pipeline, a moving end of the driving mechanism is connected with the plug-in door, drives the plug-in door to move horizontally to open or close an opening of the coal mill pipeline, the limit switch assembly comprises a feedback magnet and two magnetic limit switches, the two magnetic limit switches are arranged on the fixing frame in a spaced mode and are in communication connection with the driving mechanism, and the feedback magnet is arranged on the plug-in door. Since the limit switch assembly is a non-contact magnetic limit switch, the unstable problem of in-place feedback signal caused by stroke change of the plug-in door is avoided, and the problem of frequent damage of the limit switch caused by impact of plug-in door switch operation on the mechanical limit switch is avoided. ACCURACY OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the plug-in door opening in the coal mill pipeline opening and closing device.

[0020] Figure 2 It is the structural schematic view of the closing structure of the plug door in the opening and closing device for the coal mill pipeline;

[0021] Figure 3 It is the structural schematic view of the magnetic limit switch;

[0022] Figure 4 It is Figure 3 The exploded schematic view of the first perspective;

[0023] Figure 5 It is Figure 3 The exploded schematic view of the second perspective.

[0024]

Explanation of reference signs

[0025] 1: drive mechanism;2: fixed frame;21: fixed beam;3: plug door;4: limit switch assembly;41: feedback magnet;42: magnetic limit switch;421: mounting plate;422: adjusting unit;4221: adjusting plate;4222: adjusting rod;4223: nut;423: magnetic limit switch body;5: coal mill pipeline;6: adjusting support;7: connecting flange;8: vibrator. DETAILED DESCRIPTION

[0026] In order to better explain the utility model, so as to facilitate understanding, the utility model is described in detail below by specific implementation manners combined with the drawings.

[0027] As Figure 1 And Figure 2 The embodiment provides an opening and closing device for a coal mill pipeline, and the opening and closing device comprises a drive mechanism 1, a fixed frame 2, a plug door 3 and a limit switch assembly 4, wherein, in order to fix the drive mechanism 1, the first end of the fixed frame 2 is connected with the fixed end of the drive mechanism 1, and the second end of the fixed frame 2 can be connected with the coal mill pipeline 5. The moving end of the drive mechanism 1 is connected with the plug door 3, and drives the plug door 3 to move horizontally to open or close the opening of the coal mill pipeline 5, and in the embodiment, the drive mechanism 1 is a hydraulic cylinder telescopic rod, and the moving end of the hydraulic cylinder telescopic rod is connected with the plug door 3.

[0028] As Figure 2 The limit switch assembly 4 comprises a feedback magnet 41 and two magnetic limit switches 42, the two magnetic limit switches 42 are arranged on the fixed frame 2 at intervals and are in communication connection with the drive mechanism 1, and the feedback magnet 41 is arranged on the plug door 3. Since the limit switch assembly 4 is a non-contact magnetic limit switch 42, the problem of unstable in-place feedback signal caused by stroke change of the plug door 3 is avoided, and the problem of frequent damage of the limit switch caused by the impact of plug door 3 switch operation on the mechanical limit switch is avoided.

[0029] In the embodiment, when the feedback magnet 41 moves to the magnetic limit switch 42 on the side away from the mill pipe 5, the magnetic limit switch 42 controls the driving mechanism 1 to stop moving and keeps the plug-in door 3 open through the controller; when the feedback magnet 41 moves to the magnetic limit switch 42 on the side close to the mill pipe 5, the magnetic limit switch 42 controls the driving mechanism 1 to stop moving and keeps the plug-in door 3 closed through the controller.

[0030] Specifically, when the feedback magnet 41 moves relative to the magnetic limit switch 42, the magnetic field strength of the feedback magnet 41 is sufficient to affect the action of the magnetron in the magnetic limit switch 42, so that the two magnetrons change the original working state, realize synchronous conversion of on-off, and the built-in permanent magnet of the magnetic limit switch 42 keeps the new working state unchanged, so that synchronous on-off conversion control of the double channels can be realized. It should be noted that in the embodiment, the interaction between the magnetic limit switch 42 and the feedback magnet 41 is prior art, and the specific principle is not described in detail.

[0031] Since the magnetic limit switch 42 is a bistable non-contact magnetic switch, the bistable magnetic switch has a "memory" feature, and the signal is more stable. The bistable non-contact magnetic switch does not need external power supply, and even if the control box loses power, the in-place signal will not disappear, improving the stability of the coal fire detection signal and the reliability of the mill protection.

[0032] As shown in Figure 3 The magnetic limit switch 42 includes a mounting plate 421, an adjusting unit 422, and a magnetic limit switch body 423. The mounting plate 421 is mounted on the fixed frame 2, and the magnetic limit switch body 423 is adjustably arranged on the mounting plate 421 along the moving direction of the plug-in door 3 through the adjusting unit 422.

[0033] As shown in Figure 4 and Figure 5As shown, in order to facilitate the position adjustment of the magnetic limit switch body 423, the adjusting unit 422 comprises an adjusting plate 4221, an adjusting rod 4222 and a nut 4223, the adjusting plate 4221 is detachably connected with the mounting plate 421, the bottom end of the adjusting plate 4221 is provided with an adjusting groove for accommodating the end of the adjusting rod 4222, the adjusting groove extends along the moving direction of the plug door 3, the top end of the adjusting plate 4221 is provided with a guide protrusion extending along the moving direction of the plug door 3, and the magnetic limit switch body 423 is provided with an open groove in sliding connection with the guide protrusion. The adjusting rod 4222 penetrates the adjusting plate 4221, the magnetic limit switch body 423 and the nut 4223 in sequence and is threadedly connected with the nut 4223, and the end of the adjusting plate 4221 is located in the adjusting groove. When it is necessary to adjust the magnetic limit switch body 423, the nut 4223 is loosened, the magnetic limit switch body 423 can slide relative to the adjusting protrusion on the adjusting plate 4221, at this time, the end of the adjusting rod 4222 can slide relative to the adjusting groove of the adjusting plate 4221, and after adjustment, the nut 4223 and the top end of the adjusting rod 4222 are locked to fix the magnetic limit switch body 423.

[0034] In order to adjust the height of the feedback magnet 41 and ensure the reliability of the feedback magnet 41 and the magnetic limit switch 42, the opening and closing device further comprises an adjusting bracket 6, the adjusting bracket 6 is in Z-shaped structure, the feedback magnet 41 is arranged on the plug door 3 through the adjusting bracket 6, and the lower part of the feedback magnet 41 is threadedly connected with the threaded hole of the adjusting bracket 6 to be adjusted.

[0035] As shown in Figure 1 and Figure 2 The fixed frame 2 comprises two fixed beams 21 arranged in an up-down manner, the first ends of the two fixed beams 21 are connected with the fixed end of the driving mechanism 1, the second ends of the two fixed beams 21 are connected with the coal mill pipeline 5, the magnetic limit switch 42 is arranged on the upper fixed beam 21, and the plug door 3 is located between the two fixed beams 21. The coal mill pipeline 5 is provided with a connecting flange 7 located at the opening of the coal mill pipeline 5, and the two fixed beams 21 are connected with the upper and lower ends of the connecting flange 7 respectively.

[0036] In actual application, since the coal powder is blown from below to above, part of the coal powder stays below the plug door 3 after the plug door 3 is closed, so that the plug door 3 is not easy to pull out. In order to avoid the jamming of the plug door 3 when it is opened, the opening and closing device further comprises a vibrator 8 arranged at the middle part of the connecting flange 7. Even if the vibrator 8 does not directly contact the plug door 3, in actual application, the vibrator 8 can vibrate the plug door 3 through the connecting flange 7, so that the coal powder on the plug door 3 is shaken off.

[0037] In the description of the utility model, it is necessary to understand that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0038] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] In the utility model, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature, can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature, can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is lower than that of the second feature.

[0040] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means 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 utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0041] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the utility model, and those skilled in the art can modify, modify, replace and change the above embodiments within the scope of the utility model.

Claims

1. A start-stop device for a coal pulverizer duct, characterized by, The device comprises a driving mechanism (1), a fixed frame (2), a plug door (3) and a limit switch assembly (4); The first end of the fixed frame (2) is connected with the fixed end of the driving mechanism (1), and the second end of the fixed frame (2) can be connected with the coal mill pipeline (5); The moving end of the driving mechanism (1) is connected with the plug door (3), so as to drive the plug door (3) to move horizontally to open or close the opening of the coal mill pipeline (5); The limit switch assembly (4) comprises a feedback magnet (41) and two magnetic limit switches (42), the two magnetic limit switches (42) are arranged on the fixed frame (2) and are in communication connection with the driving mechanism (1), and the feedback magnet (41) is arranged on the plug door (3).

2. The opening and closing device for the coal mill pipeline according to claim 1, characterized in that: The magnetic limit switch (42) comprises a mounting plate (421), an adjusting unit (422) and a magnetic limit switch body (423); The mounting plate (421) is mounted on the fixed frame (2), and the magnetic limit switch body (423) is adjustably arranged on the mounting plate (421) through the adjusting unit (422) along the moving direction of the plug door (3).

3. The opening and closing device for the coal mill pipeline according to claim 2, characterized in that: The adjusting unit (422) comprises an adjusting plate (4221), an adjusting rod (4222) and a nut (4223); The adjusting plate (4221) is detachably connected with the mounting plate (421), the bottom end of the adjusting plate (4221) is provided with an adjusting groove for accommodating the end of the adjusting rod (4222), and the adjusting groove extends along the moving direction of the plug door (3); The top end of the adjusting plate (4221) is provided with a guide protrusion extending along the moving direction of the plug door (3), the magnetic limit switch body (423) is provided with an opening groove, and the opening groove is in sliding connection with the guide protrusion; The adjusting rod (4222) penetrates the adjusting plate (4221), the magnetic limit switch body (423) and the nut (4223) in sequence, and the end of the adjusting plate (4221) is located in the adjusting groove.

4. The opening and closing device for the coal mill pipeline according to claim 1, characterized in that: It further comprises an adjusting support (6); The adjusting support (6) is in Z-shaped structure, the feedback magnet (41) is arranged on the plug door (3) through the adjusting support (6); The lower part of the feedback magnet (41) is in threaded connection with the threaded hole of the adjusting support (6).

5. The opening and closing device for the coal mill pipeline according to claim 1, characterized in that: The fixed frame (2) comprises two fixed beams (21) arranged in an up-down manner; The first ends of the two fixed beams (21) are connected with the fixed end of the driving mechanism (1), and the second ends of the two fixed beams (21) are connected with the coal mill pipeline (5); The magnetic limit switch (42) is arranged on the upper fixed beam (21). The plug door (3) is located between the two fixed beams (21).

6. The opening and closing device for the coal mill pipe according to claim 5, characterized in that: The coal mill pipe (5) is provided with a connecting flange (7); The connecting flange (7) is located at the opening of the coal mill pipe (5); The two fixed beams (21) are respectively connected to the upper and lower ends of the connecting flange (7).

7. The opening and closing device for the coal mill pipe according to claim 6, characterized in that: It further comprises a vibrator (8); The vibrator (8) is arranged at the middle part of the connecting flange (7).

8. The opening and closing device for the coal mill pipe according to claim 1, characterized in that: The driving mechanism (1) is a hydraulic cylinder telescopic rod; The moving end of the hydraulic cylinder telescopic rod is connected with the plug door (3).