A coal mill equipped with a maintenance door mechanism

Abstract

The present invention relates to a coal mill provided with a maintenance door mechanism, which includes a coal mill main body and a maintenance door mechanism. An inspection opening is provided on the coal mill main body, and a first sealing portion is provided around the inspection opening. A first communication port is provided on the first sealing portion. The maintenance door mechanism includes a sealing door and a pneumatic control component. The sealing door is used to open and close the inspection opening. A second sealing portion is provided on the sealing door, and a second communication port is provided on the second sealing portion. When the sealing door closes the inspection opening, the first sealing portion fits with the second sealing portion, and the first communication port communicates with the second communication port. The pneumatic control component evacuates the first communication port and the second communication port to seal between the first sealing portion and the second sealing portion. The present invention provides a new implementation method for the maintenance door of a coal mill, which is easy to operate, saves manpower, uses the action of atmospheric pressure to tightly fit the sealing door on the inspection opening, has a good sealing effect, can be quickly sealed, is beneficial to workers to improve work efficiency, and reduces the delay of subsequent production processes.

Description

Technical Field

[0001] The present invention belongs to the field of coal mills, and particularly relates to a coal mill provided with a maintenance door mechanism. Background Art

[0002] In the prior art, in order to facilitate later work maintenance and repair of the coal mill, a corresponding maintenance opening is usually provided at the position where the coal mill roller is installed. The maintenance doors of the existing installed coal mills are usually positioned and fixed with a large number of bolts to ensure the sealing of the coal mill by the maintenance door and prevent problems such as dust dispersion when the coal mill is working. However, during maintenance and disassembly, workers need to remove the bolts one by one to disassemble the maintenance door, and the operation steps are troublesome, which is not conducive to the rapid operation of the maintenance work.

[0003] The information disclosed in this background art section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0004] The purpose of the present invention is to provide a coal mill provided with a maintenance door mechanism for realizing the quick opening and closing of the maintenance opening and the sealing of the maintenance opening.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A coal mill provided with a maintenance door mechanism includes a coal mill main body, a maintenance opening is provided on the coal mill main body, a first sealing portion is provided around the maintenance opening, a first communication port is provided on the first sealing portion, and the coal mill further includes a maintenance door mechanism, and the maintenance door mechanism includes:

[0007] A sealing door: The sealing door is matched with the shape and size of the maintenance opening and is used to open and close the maintenance opening. A second sealing portion is provided on the sealing door, and a second communication port is provided on the second sealing portion;

[0008] An air control assembly: The air control assembly is communicated with at least one of the first communication port and the second communication port;

[0009] When the sealing door closes the maintenance opening, the first sealing portion and the second sealing portion are in corresponding positions and fit together, the first communication port and the second communication port are in corresponding positions and communicated, and the air control assembly evacuates the first communication port and the second communication port to seal between the first sealing portion and the second sealing portion.

[0010] Preferably, the air control assembly includes an air pipe group and a charging and evacuating component, and the charging and evacuating component is communicated with at least one of the first communication port and the second communication port through the air pipe group and inflates or evacuates it.

[0011] Preferably, when the inspection door opens the inspection opening, the pneumatic control component inflates the first communication port and the second communication port to release the seal between the first sealing portion and the second sealing portion.

[0012] More preferably, a plurality of the first communication ports and the second communication ports are correspondingly provided and form a plurality of groups of communication port groups. The trachea group includes a main trachea and a plurality of bronchial tubes communicated with the main trachea. The main trachea is communicated with the air charging and pumping component, and each bronchial tube is communicated with a group of the communication port groups.

[0013] Preferably, the inspection door mechanism further includes a sealing component, which is disposed on at least one of the first sealing portion and the second sealing portion. When the inspection door closes the inspection opening, the sealing component simultaneously covers the first communication port and the second communication port.

[0014] More preferably, a through hole is formed in the sealing component. When the inspection door closes the inspection opening, the through hole communicates the first communication port and the second communication port.

[0015] Preferably, the inspection door is rotatably connected to the inspection opening through a rotating shaft, and the rotating shaft is located at the bottom of the inspection door and the inspection opening.

[0016] More preferably, the inspection door mechanism further includes a support assembly, which includes a support groove and a first support rod. The support groove is formed at the top outside the inspection door. One end of the first support rod is rotatably connected in the support groove. The first support rod has a first state and a second state. When the first support rod is in the first state, the whole of the first support rod is received in the support groove; when the first support rod is in the second state, the other end of the first support rod extends out of the support groove.

[0017] Even more preferably, the support assembly further includes a second support rod. A cavity is formed in the first support rod, and the second support rod is movably disposed in the cavity of the first support rod and can extend out of the first support rod from the cavity of the first support rod.

[0018] Still more preferably, a locking component is disposed between the first support rod and the second support rod for locking the positions between the first support rod and the second support rod; a plurality of the locking components are provided, and the plurality of locking components are distributed along the moving direction of the second support rod relative to the first support rod.

[0019] Preferably, the inspection door mechanism further includes an opening and closing control component, which includes an opening and closing connection seat and a telescopic rod. The opening and closing connection seat is arranged outside the sealing door, and one end of the telescopic rod is rotatably connected to the opening and closing connection seat. The telescopic rod controls the sealing door to approach or move away from the inspection opening by telescoping, so that the sealing door opens and closes the inspection opening.

[0020] Preferably, the inspection door mechanism further includes a position stabilizing component, which includes a first sleeve, a second sleeve, and a plug board. The first sleeve is connected to the main body of the coal mill, and the second sleeve is connected to the sealing door. The shapes and sizes of the cavities of the first sleeve and the second sleeve match the shape and size of the radial cross-section of the plug board. When the sealing door closes the inspection opening, the plug board can be inserted into the first sleeve and the second sleeve simultaneously.

[0021] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0022] The present invention provides a new implementation method for the inspection door of the coal mill, which is easy to operate and saves manpower. When the sealing door closes the inspection opening, the air in the communication ports corresponding and cooperating with each other opened on the inspection opening and the sealing door is pumped out, and the sealing door is tightly abutted against the inspection opening by the action of atmospheric pressure, with good sealing effect, can achieve rapid sealing, is convenient to operate, and is more conducive to workers to improve work efficiency and reduce the delay of the subsequent production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Attached Figure 1 is a perspective view of this embodiment;

[0024] Attached Figure 2 is a front view of this embodiment when the sealing door is opened (the sealing component is shown);

[0025] Attached Figure 3 is a front view of this embodiment when the sealing door is opened (the sealing component is not shown);

[0026] Attached Figure 4 is a front view of this embodiment when the sealing door is closed;

[0027] Attached Figure 5 is for Attached Figure 4 is a cross-sectional view of the A-A section in;

[0028] Attached Figure 6 is for Attached Figure 4 is a cross-sectional view of the B-B section in.

[0029] In the above drawings: 1. Coal mill main body; 2. Maintenance opening; 21. First sealing part; 22. First communication port; 3. Sealing door; 31. Second sealing part; 32. Second communication port; 41. Main air pipe; 42. Branch air pipe; 5. Sealing component; 51. Through hole; 61. Connecting seat; 62. Telescopic rod; 71. Support groove; 72. First support rod; 73. Second support rod; 74. Locking component; 81. First sleeve; 82. Second sleeve; 83. Plug board; 9. Controller. Specific embodiments

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, 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 understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" 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 or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] As Figures 1-6 shown, a coal mill provided with a maintenance door mechanism includes a coal mill main body 1 and a maintenance door mechanism. A maintenance opening 2 is provided on the coal mill main body 1. The maintenance opening 2 can be used to push the coal mill roller and the operator to perform maintenance on the inside of the coal mill main body 1. The maintenance door mechanism is used to open and close the maintenance opening 2 and ensure that the maintenance opening 2 can be sealed to prevent the inside of the coal mill main body 1 from communicating with the external environment and polluting the external environment. On one coal mill, multiple sets of the maintenance opening 2 and the maintenance door mechanism can be paired and arranged.

[0034] As Figure 2 、 3As shown, the peripheral side around the inspection opening 2 has a first sealing portion 21, and the first sealing portion 21 is used for sealing contact with the inspection door mechanism to isolate the inspection opening 2 from the environment outside the main body 1 of the coal mill. A first communication port 22 is provided on the first sealing portion 21. When the first communication port 22 cooperates with the inspection door mechanism, a negative pressure is formed, so that the first sealing portion 21 and the inspection door mechanism adsorb each other. A plurality of first communication ports 22 are provided, and the plurality of first communication ports 22 can enhance the adsorption ability between the first sealing portion 21 and the inspection door mechanism and improve the sealing effect.

[0035] The inspection door mechanism includes a sealing door 3, a pneumatic control component, a sealing component 5, an opening and closing control component, a support component, a position stabilizing component, and a controller 9.

[0036] As Figures 1-6 As shown, the sealing door 3 is matched with the inspection opening 2 in shape and size and is used for opening and closing the inspection opening 2. The sealing door 3 and the inspection opening 2 are rotationally connected through a rotating shaft, and the rotating shaft is located at the bottom of the sealing door 3 and the inspection opening 2. To ensure the safety performance of the main body 1 of the coal mill, the structure of the sealing door 3 is relatively heavy. By flipping the sealing door 3 downward, it can be supported by other equipment or the bottom surface to reduce the pressure on the rotating shaft and improve the service life. A second sealing portion 31 is provided on the side of the sealing door 3 facing the inspection opening 2, and the second sealing portion 31 can form a closed sealing ring with the first sealing portion 21 to ensure the sealing of the inspection opening 2. A second communication port 32 is provided on the second sealing portion 31, and the number of the second communication ports 32 is the same as that of the first communication ports 22 and is used to cooperate with the first communication ports 22 to enhance the adsorption strength. When the sealing door 3 is closed, the first sealing portion 21 and the second sealing portion 31 are in corresponding positions and fit together, and the positions of the first communication ports 22 and the second communication ports 32 correspond to each other one by one and are connected to form a plurality of groups of communication port groups. The sizes of the first communication ports 22 and the second communication ports 32 can be the same, so that the adsorption pressures brought by the negative pressures inside each side are the same, making it more stable. In this embodiment, the communication port groups are evenly distributed on both sides of the sealing door 3 and the inspection opening 2.

[0037] The pneumatic control component includes an air pipe group and a charging and pumping component. When the sealing door 3 closes the maintenance port 2, the pneumatic control component evacuates the first communication port 22 and the second communication port 32 to seal between the first sealing part 21 and the second sealing part 31; when the sealing door 3 opens the maintenance port 2, the pneumatic control component fills the first communication port 22 and the second communication port 32 with gas to release the seal between the first sealing part 21 and the second sealing part 31. The air pipe group includes a main air pipe 41 and a plurality of branch air pipes 42 communicated with the main air pipe 41. The main air pipe 41 is fixed on the main body 1 of the coal mill to ensure the stability of the main air pipe 41. Each maintenance port 2 is equipped with a main air pipe 41, and each main air pipe 41 is communicated with a charging and pumping component to control each sealing door 3 individually. Each branch air pipe 42 is communicated with a group of communication port groups. Both the first communication port 22 and the second communication port 32 can be communicated with the branch air pipe 42. In order to avoid the movement of the branch air pipe 42 communicated with the second communication port 32 during the opening and closing of the sealing door 3, resulting in unstable connection, the branch air pipe 42 is communicated with the first communication port 22, and the branch air pipe 42 is also fixedly connected to the main body 1 of the coal mill to ensure the stability of the branch air pipe 42. The charging and pumping component adopts a vacuum pump. The vacuum pump evacuates or fills the main air pipe 41, and can evacuate or fill the branch air pipes 42 communicated with the main air pipe 41 at the same time, which is convenient for the pressure between the first sealing part 21 and the second sealing part 31 to be evenly distributed, and improves the efficiency and stability of sealing and unsealing. A valve body can also be arranged on the branch air pipe 42. After evacuating the first communication port 22 and the second communication port 32, the valve body is closed to keep the first communication port 22 and the second communication port 32 in a low-pressure or vacuum state, without the need for the charging and pumping component to continuously evacuate.

[0038] As Figure 2 , 5 , as shown in 6, when the sealing door 3 closes the maintenance port 2, the sealing component 5 is located between the sealing door 3 and the maintenance port 2, eliminating the adverse effect of the weakened sealing effect caused by the uneven surface between the first sealing part 21 and the second sealing part 31. The sealing component 5 can be arranged on both the first sealing part 21 and the second sealing part 31. In this embodiment, since the branch air pipe 42 is directly communicated with the first communication port 22, the sealing component 5 is arranged on the second sealing part 31, which is convenient for operations such as cleaning and maintenance of the branch air pipe 42. When the sealing door 3 closes the maintenance port 2, the sealing component 5 covers the first communication port 22 and the second communication port 32 at the same time, avoiding the first communication port 22 and the second communication port 32 from being communicated with the external environment and resulting in air leakage, affecting the sealing effect. A plurality of through holes 51 are formed in the sealing component 5. When the sealing door 3 closes the maintenance port 2, the through holes 51 communicate the first communication port 22 and the second communication port 32, so that an adsorption pressure can also be generated in the second communication port 32. In this embodiment, the sealing component 5 adopts a gasket, and the gasket is annular and can surround the maintenance port 2.

[0039] As Figures 1-5As shown in the figure, the opening and closing control component is arranged on the sealing door 3 and is used to open and close the sealing door 3. The opening and closing control component includes an opening and closing connecting seat 61 and a telescopic rod 62. The opening and closing connecting seat 61 is arranged on the outer side of the sealing door 3. One end of the telescopic rod 62 is rotatably connected to the opening and closing connecting seat 61 and can rotate up and down in the vertical direction, in the same rotation direction as the opening and closing of the sealing door 3. The other end of the telescopic rod 62 can be connected to other driving and traction mechanisms, or connected to the ground, or can be directly driven by manual pulling without being connected to other structures. The telescopic rod 62 can be a hydraulic push rod. The telescopic rod 62 expands and contracts to control the sealing door 3 to approach or move away from the maintenance opening 2, so as to open and close the maintenance opening 2 by the sealing door 3.

[0040] As Figure 1 , 4 , as shown in Figure 6, the support component is arranged on the sealing door 3 to facilitate the support of the sealing door 3 after it is opened, avoid wear on its surface, and thus ensure the protective effect on the structure of the sealing door 3. The support component includes a support groove 71, a first support rod 72, and a second support rod 73. The support groove 71 is opened at the top of the outer side of the sealing door 3. One end of the first support rod 72 is rotatably connected in the support groove 71. The first support rod 72 has a first state and a second state. When the first support rod 72 is in the first state, the whole of the first support rod 72 is received in the support groove 71 and hidden. When the first support rod 72 is in the second state, the other end of the first support rod 72 extends out of the support groove 71 and is used to support the sealing door 3 when the sealing door 3 is laid down. A cavity is provided in the first support rod 72. The second support rod 73 is movably arranged in the cavity of the first support rod 72, and the second support rod 73 can extend out of the cavity of the first support rod 72 to the outside of the first support rod 72. A locking member 74 is arranged between the first support rod 72 and the second support rod 73. The locking member 74 is used to lock the positions between the first support rod 72 and the second support rod 73. A plurality of locking members 74 are provided, and the plurality of locking members 74 are distributed along the moving direction of the second support rod 73 relative to the first support rod 72. By adjusting the length of the second support rod 73 extending out of the first support rod 72 and locking it with the locking members 74 at different positions, the overall support length of the first support rod 72 and the second support rod 73 is adjusted. The locking member 74 can be a matching positioning bolt and positioning hole, and the positioning bolt is inserted into the positioning hole to lock the relative position. When the ground height position is uneven, the overall support length of the first support rod 72 and the second support rod 73 is adjusted according to the actual use situation.

[0041] As Figures 1-4, as shown in Figures 6, the position stabilizing component is arranged between the inspection opening 2 and the sealing door 3, used to ensure the accuracy of the relevant acting positions of the opening and closing control component, and ensure that a sealing ring can be formed between the first sealing part 21 of the inspection opening 2 and the second sealing part 31 of the sealing door 3. The position stabilizing component includes a first sleeve 81, a second sleeve 82, and an insertion plate 83. The first sleeve 81 is connected to the main body 1 of the coal mill and is located on both sides of the inspection opening 2. The second sleeve 82 is connected to the sealing door 3 and is located on both sides of the sealing door 3. The shapes and sizes of the cavities of the first sleeve 81 and the second sleeve 82 match the shapes and sizes of the radial cross-section of the insertion plate 83. The insertion plate 83 is connected to the main body 1 of the coal mill and extends in the vertical direction. An electric motor is connected to the insertion plate 83, which can control the insertion plate 83 to move in the vertical direction. When the sealing door 3 closes the inspection opening 2, the insertion plate 83 can be inserted into the first sleeve 81 and the second sleeve 82 at the same time, and the relative position between the first sleeve 81 and the second sleeve 82 can be locked, that is, the relative position between the sealing door 3 and the inspection opening 2 can be locked. Multiple sets of matching first sleeves 81 and second sleeves 82 can be arranged on the same side, and a single insertion plate 83 is arranged on one side and inserted into multiple sets of first sleeves 81 and second sleeves 82 on that side at the same time, used to correct the positional relationship between the sealing door 3 and the inspection opening 2, so that the first sealing part 21 and the second sealing part 31 are butted more precisely. In order to ensure that the insertion plate 83 can be smoothly inserted into the first sleeve 81 and the second sleeve 82, corresponding chamfers are provided on both sides of the bottom of the insertion plate 83.

[0042] As Figures 1-4 shown, the controller 9 is installed on the main body 1 of the coal mill. The controller 9 can be electrically connected to the air charging and extracting component, the telescopic rod 62, the first support rod 72, and the electric motor connected to the insertion plate 83, and is independently controlled in units of each set of sealing door 3 and inspection opening 2, and is manipulated through system planning. At the same time, these components can also be manually manipulated separately according to actual situations.

[0043] The working principle of this embodiment is specifically described as follows:

[0044] As Figures 1-6 shown, when the coal mill needs to seal the sealing door 3, the controller 9 controls the telescopic rod 62 to extend to push the sealing door 3 to a suitable position to be in close contact with the inspection opening 2, and then controls the insertion plate 83 to move downward and insert into the corresponding first sleeve 81 and second sleeve 82 to correct the relative position between the sealing door 3 and the inspection opening 2. Then, it controls the air charging and extracting component to work to extract the gas in the first communication port 22 and the second communication port 32 and close the valve body valve on the control bronchus 42, so that the air pressure in the first communication port 22 and the second communication port 32 is constantly less than the external atmospheric pressure, so that the sealing door 3 tightly seals the inspection opening 2 under the action of the atmospheric pressure. When it is necessary to open the sealing door 3, the above operation steps are performed in reverse.

[0045] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It is not intended to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A coal mill provided with a maintenance door mechanism, comprising a coal mill main body, characterized in that: An inspection opening is formed on the main body of the coal mill. A first sealing portion is provided around the inspection opening. A first communication port is formed on the first sealing portion. The coal mill further includes an inspection door mechanism, and the inspection door mechanism includes: A sealing door: The sealing door is matched with the inspection opening in shape and size and is used to open and close the inspection opening. A second sealing portion is provided on the sealing door. A second communication port is formed on the second sealing portion. A plurality of first communication ports and second communication ports are correspondingly formed to form a plurality of groups of communication port groups; An air control assembly: The air control assembly is communicated with at least one of the first communication port and the second communication port. The air control assembly includes an air pipe group and an air charging and pumping component. The air charging and pumping component is communicated with at least one of the first communication port and the second communication port through the air pipe group and inflates or pumps air to it. The air pipe group includes a main air pipe and a plurality of branch air pipes communicated with the main air pipe. The main air pipe is communicated with the air charging and pumping component. Each branch air pipe is communicated with a group of the communication port groups; A support assembly: The support assembly includes a support groove and a first support rod. The support groove is formed at the top outside the sealing door. One end of the first support rod is rotatably connected in the support groove. The first support rod has a first state and a second state. When the first support rod is in the first state, the first support rod is entirely received in the support groove; when the first support rod is in the second state, the other end of the first support rod extends out of the support groove; A sealing component: The sealing component is provided on at least one of the first sealing portion and the second sealing portion. A through hole is formed on the sealing component; When the sealing door closes the inspection opening, the first sealing portion and the second sealing portion are in corresponding positions and are attached to each other. The first communication port and the second communication port are in corresponding positions and are communicated with each other. The air control assembly pumps air to the first communication port and the second communication port to seal between the first sealing portion and the second sealing portion. The sealing component simultaneously covers the first communication port and the second communication port. The through hole communicates the first communication port and the second communication port.

2. The coal mill provided with an inspection door mechanism according to claim 1, wherein: The support assembly further includes a second support rod. A cavity is formed in the first support rod. The second support rod is movably arranged in the cavity of the first support rod. The second support rod can extend out of the first support rod from the cavity of the first support rod.

3. The coal mill provided with a maintenance door mechanism according to claim 1, wherein: The inspection door mechanism further includes an opening and closing control assembly. The opening and closing control assembly includes an opening and closing connection seat and a telescopic rod. The opening and closing connection seat is arranged outside the sealing door. One end of the telescopic rod is rotatably connected to the opening and closing connection seat. The telescopic rod controls the sealing door to approach or move away from the inspection opening by telescoping to open and close the inspection opening.

4. The coal mill provided with an inspection door mechanism according to claim 1, characterized in that: The inspection door mechanism further includes a position stabilizing assembly, which includes a first sleeve, a second sleeve, and a plug plate. The first sleeve is connected to the main body of the coal mill, and the second sleeve is connected to the sealing door. The shapes and sizes of the inner cavities of the first sleeve and the second sleeve match the shape and size of the radial cross-section of the plug plate. When the sealing door closes the inspection opening, the plug plate can be inserted into the first sleeve and the second sleeve simultaneously.

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