Flashboard door device for coal mill outlet powder pipe and using method of flashboard door device

Abstract

The invention provides a flashboard door device for a coal mill outlet powder pipe and a using method, the flashboard door device comprises a fixed frame installed on the powder pipe, an open groove is formed in the position, located in the fixed frame, of the powder pipe, a flashboard door is installed in the open groove, and a linkage assembly is connected to the flashboard door; the linkage assembly is installed in the installation bin body assembly, and one end of the installation bin body assembly is connected with the fixing frame; the linkage assembly is in signal connection with a limiting stopper, and the limiting stopper is installed at the position, corresponding to the opening groove, in the fixing frame. According to the device, by adjusting the extending amount of the flashboard door in the powder pipe, the air flow of the powder pipe is controlled, and the distribution deviation adjusting effect of the air powder amount of the powder pipe is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mill equipment, and in particular to a gate device for a coal mill outlet powder pipe and a use method thereof. Background Art

[0002] Medium-speed coal mill plays a vital role in large-capacity coal-fired power units. As an indispensable auxiliary equipment for large coal-fired power units, its performance directly affects the operating efficiency of the entire unit. However, due to the limitations of the medium-speed coal mill itself, the distribution of the air and powder amount in the outlet powder pipe often has deviations, and the distribution deviation of the air and powder amount in the outlet powder pipe is difficult to control, which makes it difficult to ensure the combustion uniformity of the coal-fired power unit boiler.

[0003] In order to improve the combustion uniformity of the boiler of the coal-fired power unit, a valve is often set on the powder pipe of the medium-speed coal mill. By controlling the opening and closing of the valve, the transmission of coal powder in the pipeline is controlled, and then the distribution deviation of the powder pipe is adjusted; then the existing valve can only maintain two states of fully open or fully closed. When the valve is in the fully open state, the coal enters the medium-speed coal mill; when the valve is in the fully closed state, the coal cannot enter the medium-speed coal mill, and then the medium-speed coal mill is in a shutdown state. This simple and effective control method enables us to accurately control the transmission of coal powder, thereby ensuring the stable operation of the coal mill and the entire coal-fired power unit. However, in actual operation, when it is necessary to reduce the co-flow of the powder pipe, it is often necessary to make the valve fully closed and then open it again after a period of time. This control method requires the staff to pay close attention to the operating status of the gate to avoid the state of the gate not matching the working state of the coal mill, which will have an adverse effect on the coal-fired power unit, and thus the work intensity of the staff is high, and the distribution deviation adjustment effect of the powder pipe air powder amount is poor. Summary of the invention

[0004] In order to solve the problem that the valve installed on the existing powder hose can only realize the fully open or fully closed state and has poor effect in adjusting the distribution deviation of the air and powder amount of the powder hose, the present invention provides a gate door device for a powder hose at a coal mill outlet and a use method thereof.

[0005] To achieve the above object, the present invention provides the following technical solutions: The present invention proposes a gate door device for a powder pipe at a coal mill outlet, comprising a fixed frame installed on the powder pipe, an open groove is provided on the powder pipe at a position located inside the fixed frame, a gate door is installed in the open groove, a linkage assembly is connected to the gate door, the linkage assembly is installed in an installation bin assembly, and one end of the installation bin is connected to the fixed frame; The linkage assembly signal is connected to a limiter, and the limiter is installed at a position in the fixed frame corresponding to the opening groove.

[0006] Preferably, a slide groove is provided inside the fixed frame at the position where the groove should be opened, the gate door is slidably installed in the slide groove, and the limiter is installed on the side of the slide groove in the fixed frame.

[0007] Preferably, the limiter is one or more of an infrared sensor, a potentiometer displacement sensor, a photoelectric displacement sensor and a magnetoelectric displacement sensor.

[0008] Preferably, sealing members are respectively arranged on both sides of the slide groove in the fixed frame.

[0009] Preferably, the sealing member is one or both of a graphite composite sealing plate and a metal sealing plate.

[0010] Preferably, the installation bin body comprises a gate bin and an installation bin, one end face of the gate bin is connected to the fixed frame, and the other end face of the gate bin is connected to the installation bin, and the linkage mechanism is installed in the installation bin.

[0011] Preferably, the linkage assembly includes an actuator and a push-pull mechanism; The push-pull mechanism includes a gate pull rod bin, the gate pull rod bin is installed in the installation bin, a gate pull rod is installed in the gate pull rod bin, one end of the gate pull rod is connected to the gate door, the gate pull rod is connected to a reducer, and the reducer is connected to an actuator.

[0012] Preferably, the actuator is a direct-thrust motor.

[0013] Preferably, the gate door is a perforated gate, and the material of the gate door is wear-resistant corundum.

[0014] The present invention proposes a method for using a gate door device for a coal mill outlet powder pipe, which is used to use the above-mentioned device, comprising the following steps: Get the air and powder flow rate of the powder hose; Based on the air-powder flow rate, a linkage component is installed in the bin body component, and the linkage component drives the gate door to move to adjust the air-powder flow rate of the powder tube; The limiter monitors the position of the gate door, and when the gate door opening reaches a specified position, the limiter controls the linkage assembly to stop working.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention proposes a gate door device for a powder pipe at the outlet of a coal mill. The device not only ensures the stability of the structure by setting a fixed frame on the powder pipe and cleverly opening an opening groove in the inner position of the frame, but also creates conditions for realizing the flexible opening and closing of the gate door. The gate door is a key component for controlling the flow of coal powder. The precise coordination of its installation and linkage components makes the operation more accurate and efficient. The linkage components not only simplify the operation process of the gate door, but also effectively protect the key transmission components and extend the service life by being installed in the installation bin assembly. The tight connection between the installation bin and the fixed frame enhances the stability and safety of the entire device. The limiter signal is connected to the linkage component, which can monitor the position state of the gate door in real time, ensure that it moves accurately within the set range, and avoid equipment damage or safety hazards caused by excessive opening or closing. The device controls the airflow flow of the powder pipe by adjusting the amount of the gate door inserted into the powder pipe, and significantly improves the distribution deviation adjustment effect of the powder pipe air and powder amount.

[0016] Furthermore, the slide groove design added to the opening slot position inside the fixed frame of the device provides a stable and smooth sliding track for the gate door, greatly improving the fluency and accuracy of the gate door opening and closing, reducing the friction loss of the gate door during movement, ensuring that it can maintain a stable operating state under any operating state, and using high-precision limiters such as infrared sensors, potentiometer displacement sensors, photoelectric displacement sensors or magnetoelectric displacement sensors to enhance the reliability of gate door position control. These sensors can monitor the displacement of the gate door in real time and accurately, and feed back signals to the linkage components to achieve precise position adjustment and limit protection, improve the automation level of the equipment, and ensure the safety and stability of the operation process.

[0017] Furthermore, in this device, seals are added on both sides of the slide groove of the fixed frame to improve the sealing performance of the gate door device for the powder pipe at the outlet of the coal mill. Graphite composite sealing plates and / or metal sealing plates are used as sealing materials. With their excellent wear resistance, high temperature resistance and sealing effect, they effectively prevent the leakage of coal powder during the opening and closing process of the gate door, thereby improving the operating efficiency of the equipment, significantly improving the working environment and reducing dust pollution.

[0018] Furthermore, the installation bin body in the device is divided into a gate bin and an installation bin, which provides a more reasonable layout for the gate door device for the coal mill outlet powder pipe. The gate bin is directly connected to the fixed frame, providing stable support for the installation and sliding of the gate door; and the installation bin serves as the installation space of the linkage mechanism, ensuring the concealment and safety of the transmission components, which not only simplifies the installation and maintenance process of the equipment, but also improves the compactness and stability of the overall structure.

[0019] Furthermore, in this device, the gate door is directly connected to the gate rod in the gate rod bin, and the reducer is used to achieve precise and smooth push-pull control of the gate door. The direct-push motor as an actuator ensures the rapid response and precise execution of the linkage components with its efficient and stable performance, further improving the automation level and operating efficiency of the equipment, simplifying the operating process, and reducing energy consumption.

[0020] Furthermore, the gate door in this device is a perforated gate door, and wear-resistant corundum is used as the material of the gate door, which greatly enhances the durability and wear resistance of the gate door device for the coal mill outlet powder pipe, not only extending the service life of the gate door, but also improving its stability and reliability in harsh working environments, ensuring the long-term and efficient operation of the equipment.

[0021] The present invention proposes a method for using a gate door device for a powder pipe at a coal mill outlet. The method monitors the air and powder flow of the powder pipe in real time, and starts a linkage component according to demand to drive the gate door to move, thereby realizing precise adjustment of the air and powder flow. At the same time, the introduction of a limiter provides a strong guarantee for the precise positioning of the gate door. When the gate door reaches a specified position, the limiter can respond quickly and control the linkage component to stop working, avoiding equipment damage or safety hazards caused by excessive adjustment, which not only improves the automation level and operation efficiency of the equipment, but also ensures the safety and stability of the operation process. Through the implementation of this method, enterprises can achieve more precise air and powder flow control, improve production efficiency, and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a gate door device for a coal mill outlet powder pipe proposed by the present invention; Figure 2 This is a structural schematic diagram of a gate door device for a coal mill outlet powder pipe with a 0% opening degree proposed by the present invention; Figure 3 This is a schematic structural diagram of a gate door device for a coal mill outlet powder pipe with a 100% opening degree proposed by the present invention; In the attached figure: 1. Powder hose; 2. Fixed frame; 3. Gate bin; 4. Mounting bin; 5. Seal; 6. Gate door; 7. Gate pull rod; 8. Actuator; 9. Gate pull rod bin. DETAILED DESCRIPTION

[0023] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0024] In the description of the present invention, it should 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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.

[0025] 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 one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] 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 connection; it can be a mechanical connection, an electrical connection, or a communication; 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] See also Figure 1~Figure 3The present invention proposes a gate door device for powder pipe at the outlet of coal mill. The device comprises a fixed frame 2 installed on the powder pipe 1. An opening slot is arranged on the powder pipe 1 at a position inside the fixed frame 2. Two gate doors 6 are installed in parallel in the opening slot. In this embodiment, the two-way gate door 6 has higher adjustment stability and better flexibility of two-way independent control than the one-way gate door, and has less influence on the deviation of the air and powder flow in the powder pipe. A linkage component is connected to the end face of one side of the principle powder pipe 1 on each gate door 6. The linkage component is installed in the installation bin body component. One end of the installation bin body is connected to the fixed frame 2. The linkage component signal is connected to a limiter. The limiter is installed at the position corresponding to the opening slot in the fixed frame 2. The device drives the gate door 6 to move through the linkage mechanism. During the movement, the opening of the gate door 6 is controlled by the limiter, thereby changing the flow area at the opening slot in the powder pipe 1, so that the distribution deviation of the powder pipe 1 at the outlet of the coal mill is kept within 5%, thereby ensuring the uniformity of the deviation of the air and powder amount between the powder pipes at the outlet of the coal mill.

[0030] Preferably, a slide groove is provided at a position corresponding to the opening groove on the inside of the fixed frame 2, the slide groove is parallel to the length direction of the opening groove, and the gate door 6 is slidably installed in the slide groove, and a plurality of limiters are installed on the side of the slide groove along the length direction of the slide groove in the fixed frame 2, and the opening of the gate door 6 is monitored by the plurality of limiters, wherein the limiter is one or more of an infrared sensor, a potentiometer displacement sensor, a photoelectric displacement sensor and a magnetoelectric displacement sensor.

[0031] See also Figure 1~Figure 3 The upper and lower sides of the slide groove in the fixed frame 2 are respectively provided with seals 5, and the two sides of the open groove on the powder tube 1 are sealed by the seals 5 to improve the sealing effect of the device. The seals 5 are one or both of a graphite composite sealing plate and a metal sealing plate.

[0032] See also Figure 1~Figure 3 The installation bin body includes a gate bin 3 and an installation bin 4. One end face of the gate bin 3 is connected to the fixed frame 2, and the other end face of the gate bin 3 is connected to the installation bin 4. A linkage mechanism is installed in the installation bin 4. The gate door 6 moves in the opening groove through the linkage mechanism to adjust the flow area of ​​the powder tube 1. When the linkage mechanism makes the device reach 100% opening, the gate door 6 is located in the gate bin 3.

[0033] See also Figure 1~Figure 3The gate door 6 is a perforated gate, and the material of the gate door 6 is 99 wear-resistant corundum; compared with the traditional pipeline gate door (single-side pull rod or shutter type), when the orifice gate is fully closed, the gate door shape is similar to a porous plate with a certain opening rate. In this application scenario, in addition to reducing the flow area to reduce the air and powder flow, it also has the function of improving the uniformity of air and powder distribution in the powder pipe 1, which is beneficial to improve the accuracy of online monitoring of its downstream air and powder flow.

[0034] See also Figure 1~Figure 3 The linkage assembly includes an actuator 8 and a push-pull mechanism, which is installed in the installation bin 4. The push-pull mechanism includes a gate pull rod bin 9, which is installed in the installation bin 4. A gate pull rod 7 is installed in the gate pull rod bin 9. One end of the gate pull rod 7 is connected to the gate door 6. A reducer is connected to the gate pull rod 7, and the reducer is connected to the actuator 8. The actuator 8 is a direct-push motor. Preferably, the actuator 8 includes a first gear and a second gear, the first gear and the second gear are meshed, the first gear is rotatably installed on the gate rod bin 9 at one end close to the gate bin 3, a threaded hole is provided at the center position of the first gear, the threaded hole is threadedly connected to the gate rod 7, the gate rod 7 is moved in the gate rod bin 9 by the rotation of the first gear, the second gear is connected to a reducer, the reducer is connected to a DC motor, and the DC motor is installed on the side of the gate rod bin 9. The present invention proposes a method for using a gate door device for a powder pipe at a coal mill outlet, which is used to operate the device to adjust the flow area of ​​the powder pipe, and specifically comprises the following steps: Get the air and powder flow rate of the powder hose; Based on the air-powder flow rate, a linkage component is installed in the bin body component, and the linkage component drives the gate door to move to adjust the air-powder flow rate of the powder tube; The limiter monitors the position of the gate door. When the gate door opening reaches a specified position, the limiter controls the linkage assembly to stop working. Specifically, when the system is put into operation, the initial opening of all gates is 100%. The air and powder flow rate of each powder pipe can be obtained through the coal mill outlet powder pipe air and powder flow line monitoring system, and the relevant data is transmitted to the gate door PLC control system of the coal mill outlet powder pipe through the signal transmission system. When it is identified that the distribution deviation between the coal mill outlet powder pipes is higher than 5% (this indicator can be flexibly set according to the unit operation status, and it is generally recommended to be 5%), and the air and powder flow rate of a powder pipe is high, the gate door PLC control system controls the actuator in the linkage structure to work, and The actuator drives the gate rod in the gate rod bin to move, and then pushes the gate door to move along the slide slot through the gate rod, and extends into the powder tube. The position of the gate door extending into the powder tube is monitored by the limiter, and the gate door opening corresponding to the powder tube is reduced; when it is recognized that the air powder flow of the powder tube is low, and the gate door opening corresponding to the position of the gate door extending into the powder tube monitored by the limiter is below 40%, the actuator moves in the opposite direction, and pulls the gate door along the slide slot through the gate rod, so that the gate door slowly moves out of the powder tube, and the gate door opening corresponding to the powder tube is increased; Among them, in order to avoid large fluctuations in the monitored air and powder flow, the maximum change rate of the gate door opening is 10% / min. When the unit's pulverizing system is running, the coal mill outlet powder pipe air and powder volume line monitoring system and the gate door PLC control system are in a dynamic adjustment state, constantly monitoring and adjusting the air and powder flow of the powder pipe, and then by adjusting this device, the distribution deviation between the coal mill outlet powder pipes is kept within 5%, ensuring the uniformity of the air and powder volume deviation between the coal mill outlet powder pipes 1.

[0035] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0036] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A gate door device for a coal mill outlet powder pipe, characterized in that: It comprises a fixed frame (2) mounted on a powder tube (1), an open slot being arranged at a position inside the fixed frame (2) on the powder tube (1), a gate door (6) being mounted in the open slot, a linkage assembly being connected to the gate door (6), the linkage assembly being mounted in a mounting bin assembly, one end of the mounting bin being connected to the fixed frame (2); The linkage component signal is connected to a limiter, and the limiter is installed at a position in the fixed frame (2) corresponding to the opening groove.

2. A gate door device for a coal mill outlet powder pipe according to claim 1, characterized in that: A sliding groove is provided inside the fixed frame (2) at the position where the groove should be opened, the gate door (6) is slidably installed in the sliding groove, and the limiter is installed on the side of the sliding groove in the fixed frame (2).

3. A gate door device for a coal mill outlet powder pipe according to claim 2, characterized in that: The limiter is one or more of an infrared sensor, a potentiometer displacement sensor, a photoelectric displacement sensor and a magnetoelectric displacement sensor.

4. A gate door device for a coal mill outlet powder pipe according to claim 2, characterized in that: Sealing components (5) are respectively arranged on both sides of the slide groove in the fixed frame (2).

5. A gate door device for a coal mill outlet powder pipe according to claim 4, characterized in that: The sealing element (5) is one or both of a graphite composite sealing plate and a metal sealing plate.

6. A gate door device for a coal mill outlet powder pipe according to claim 1, characterized in that: The installation bin body comprises a gate bin (3) and an installation bin (4); one end face of the gate bin (3) is connected to the fixed frame (2), and the other end face of the gate bin (3) is connected to the installation bin (4); and the linkage mechanism is installed in the installation bin (4).

7. A gate door device for a coal mill outlet powder pipe according to claim 6, characterized in that: The linkage assembly comprises an actuator (8) and a push-pull mechanism; The push-pull mechanism comprises a gate pull rod bin (9), the gate pull rod bin (9) being installed in the installation bin (4), a gate pull rod (7) being installed in the gate pull rod bin (9), one end of the gate pull rod (7) being connected to the gate door (6), the gate pull rod (7) being connected to a reducer, and the reducer being connected to an actuator (8).

8. A gate door device for a coal mill outlet powder pipe according to claim 8, characterized in that: The actuator (8) is a direct-thrust motor.

9. A gate door device for a coal mill outlet powder pipe according to claim 1, characterized in that: The gate door (6) is a perforated gate, and the material of the gate door (6) is 99 wear-resistant corundum.

10. A method for using a gate door device for a powder pipe at a coal mill outlet, used for using the device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Get the air and powder flow rate of the powder hose; Based on the air-powder flow rate, a linkage component is installed in the bin body component, and the linkage component drives the gate door to move to adjust the air-powder flow rate of the powder tube; The limiter monitors the position of the gate door, and when the gate door opening reaches a specified position, the limiter controls the linkage assembly to stop working.

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