A service door for a coal mill

Abstract

The application discloses a maintenance door for a coal mill, which comprises a maintenance opening formed on the coal mill, a door frame corresponding to the maintenance opening, a door body installed on the door frame, and a dust suppression assembly installed on the door body for dust removal of the door frame. The dust suppression assembly, a wind collecting member and a blowing assembly are installed on the door frame. The wind collecting member provides wind power for the blowing assembly, and the wind power is applied to the gap position between the baffle and the maintenance opening. The wind power is blown out through the gap position between the baffle and the maintenance opening, so that the accumulation of coal powder in the gap is avoided. The problem that the coal mill in the prior art causes a poor maintenance environment due to the accumulation of a large amount of coal powder in the door frame and the gap during work is solved, and the accumulated coal powder in the door frame and the gap can be recycled, so that the waste of coal powder is avoided.

Description

Technical Field

[0001] This invention relates to the field of coal mill maintenance doors, and specifically to a maintenance door for a coal mill. Background Technology

[0002] A coal mill is a machine that crushes and grinds coal into pulverized coal. It is an important auxiliary equipment for pulverized coal boilers. Types include vertical mills, high-pressure suspension roller mills, medium-speed micro-powder mills, high-pressure trapezoidal mills, and Raymond mills. The coal grinding process involves the crushing of coal and the continuous increase of its surface area. To increase the surface area, the binding forces between solid molecules must be overcome, thus requiring energy consumption. Coal is ground into pulverized coal in a coal mill mainly through three methods: crushing, impact crushing, and grinding. Currently, power plants generally use medium-speed micro-powder mills to grind coal into pulverized coal to meet the power plant's power generation requirements. To facilitate future troubleshooting and maintenance, existing coal mills are equipped with inspection doors, allowing for convenient troubleshooting and maintenance.

[0003] The prior art patent document with announcement number CN216767220U, entitled "A Coal Mill Equipped with an Inspection Door Mechanism," describes an inspection door device for a coal mill. Specifically, it discloses that the device includes a coal mill body and an inspection door mechanism. The coal mill body has an inspection port, and the inspection port has a first sealing part around its perimeter. The first sealing part has a first connecting port. The inspection door mechanism includes a sealing door and a pneumatic control assembly. The sealing door is used to open and close the inspection port, and the sealing door has a second sealing part with a second connecting port. When the sealing door closes the inspection port, the first sealing part and the second sealing part are in contact. "The connecting port is connected to the second connecting port, and the pneumatic control component draws air from the first connecting port and the second connecting port to seal the first sealing part and the second sealing part." However, the above-mentioned patent documents and the currently common maintenance doors generally focus on improving the maintenance door itself, emphasizing the sealing effect of the maintenance door. However, during the use of the coal mill, a large amount of coal dust may accumulate near the maintenance door and in the gaps. When the maintenance door is opened, the coal dust may leak out. However, the current maintenance doors ignore this point. Therefore, it is easy to slip and fall during maintenance, resulting in a poor maintenance environment. Moreover, the accumulation of coal dust will also lead to the waste of coal dust. Summary of the Invention

[0004] The technical problem to be solved by this invention is: how to solve the problem that a large amount of coal dust accumulates at the maintenance door of the coal mill and is not easy to remove, which in turn affects the poor maintenance environment of the coal mill and the waste of coal dust.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A maintenance door for a coal mill includes an inspection port on the coal mill and a door frame corresponding to the inspection port. A door body is installed on the door frame. The door body and the door frame are detachably installed through a plug-in positioning component. A dust suppression component for dust removal of the door frame is installed on the door body.

[0007] The dust suppression component includes a baffle, a driving component, and an air collecting component. The driving component drives the baffle to move to the inspection port position. The baffle is equipped with a blowing component. The air collecting component is connected to the blowing component through a pipe. The air outlet of the blowing component can act on the gap between the baffle and the inspection port at multiple angles.

[0008] The blowing assembly includes several sets of blowing pipes arranged in a divergent manner, and the air in the several sets of blowing pipes is sprayed out from the air outlet in different directions.

[0009] This invention installs a dust suppression component on the door frame. The drive unit within the dust suppression component moves the baffle to the inspection port position. Simultaneously, an air collecting component and a blowing component are installed. The air collecting component provides airflow to the blowing component, which then acts on the gap between the baffle and the inspection port. Therefore, airflow is blown through this gap, preventing coal dust from accumulating in the gap. This combination of dust suppression, blowing, and air collecting components prevents large amounts of coal dust from accumulating in the door frame and gaps, solving the problem of poor maintenance environment caused by large amounts of coal dust accumulating in the door frame and gaps during coal mill operation in existing technologies. Furthermore, the coal dust accumulated in the door frame and gaps can be recycled, avoiding waste and promoting energy conservation and environmental protection. This improves the quality of coal mill maintenance during malfunctions and avoids environmental impact.

[0010] As a further aspect of the present invention: the plug-in positioning component includes a plug-in component and a receiving component, wherein the plug-in component is located on one side of the door body, and the receiving component is located on the door frame, and the plug-in component engages with the receiving component when the door body and the door frame are closed.

[0011] As a further aspect of the present invention: the connector includes a fixing block, a plug and a limiting groove, wherein the fixing block is located on one side of the door body, and the fixing block has a plug on the side facing the door frame, wherein the plug has a limiting groove that engages with the connector.

[0012] As a further embodiment of the present invention: the receiving component includes a slot, a limiting block, a rack, a first spur gear, a second spur gear, and a rotating component, wherein the first spur gear and the second spur gear are disposed on the door frame and mesh with each other, the second spur gear is provided with a rotating component that drives it to rotate, and a limiting component that limits the first spur gear is provided on one side.

[0013] The rack is located on one side of the first spur gear and the two mesh with each other. The side of the rack facing away from the first spur gear is connected to the limiting block via a connecting rod.

[0014] As a further aspect of the present invention: the blower assembly includes several sets of blower pipes, all of which are connected to a manifold in the middle. The manifold and the blower pipes are both located inside a baffle, and the air outlet of each blower pipe extends from the side wall of the baffle. The manifold is connected to a drive unit on the side facing away from the door frame.

[0015] As a further aspect of the present invention: the driving component includes a motor, a drive shaft, a threaded rod, a sleeve, and a fixing plate, wherein the motor can drive the sleeve to make linear motion on the outside of the threaded rod;

[0016] One end of the sleeve is detachably installed with a fixing plate and a baffle. The inside of the sleeve is threadedly connected to a threaded rod. The end of the threaded rod facing away from the sleeve is connected to a coupling via a drive shaft and then to a motor. A second through groove is opened on the drive shaft.

[0017] As a further aspect of the present invention: the sleeve has a sliding tube inside, one end of the sliding tube is connected to the blower assembly, the outer surface of the sliding tube is movably connected to the fixed tube inside the threaded rod and connected to the tension spring inside the fixed tube, and a first through groove is opened at the end of the fixed tube facing away from the sliding tube.

[0018] As a further aspect of the present invention: a fixed post is provided at one end of the threaded rod facing the sleeve, and a threaded block is provided at one end of the sleeve facing the threaded rod, wherein the threaded block and the threaded rod are threadedly connected, and the threaded block and the fixed post are rotatably connected.

[0019] As a further embodiment of the present invention: the air collecting component is located on the outside of the drive shaft, and a support tube is detachably installed on the side of the air collecting component facing the door body, wherein the other end of the support tube is detachably installed to the door body, and the threaded rod is located inside the support tube, and the two do not contact each other;

[0020] The air collecting component has a detachable bushing on the side facing away from the door. One end of the bushing is connected to the motor. The drive shaft and coupling are both located inside the bushing and do not contact the bushing.

[0021] As a further aspect of the present invention: the air collecting component includes a cover and a fan wheel, the fan wheel is rotatably connected inside the cover, and the shaft of the fan wheel is fixedly connected to the drive shaft.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] I. This invention installs a dust suppression component on the door frame. The driving component within the dust suppression component can drive the baffle to the inspection port position. At the same time, an air collecting component and an air blowing component are set up. The air collecting component provides air power to the air blowing component, and the air blowing component acts on the gap between the baffle and the inspection port. Therefore, air power will be blown out through the gap between the baffle and the inspection port, preventing coal dust from accumulating in the gap. Thus, the setting of the dust suppression component, air blowing component, and air collecting component prevents coal dust from accumulating in the door frame and gaps. This solves the problem of poor maintenance environment caused by a large amount of coal dust accumulating in the door frame and gaps during the operation of the coal mill in the prior art. Moreover, the coal dust accumulated in the door frame and gaps can be recycled and reused, avoiding waste of coal dust, saving energy and protecting the environment. This improves the quality of maintenance when the coal mill is malfunctioning and will not affect the surrounding environment.

[0024] Second, in this invention, the air collecting component is mounted on the drive shaft of the drive component. The motor inside the drive component can drive the sleeve to move linearly along the threaded rod, thereby moving the baffle. After the baffle is moved to the required maintenance port position, the motor drives the air collecting component to work, thereby blowing air out from the air pipe inside the baffle and blowing the coal powder in the maintenance port into the coal mill. This application integrates the drive component and the air collecting component into one unit, which not only saves space and is easy to store, but also cleverly combines the two together, with a reasonable structural design, improving the practicality of this application.

[0025] Third, this invention sets a connector on the door body and a receiving part on the door frame. When the door body and the door frame are closed, the connector can be inserted into the receiving part. The two parts work together through the cooperation of two flat gears and a rack in the receiving part to move the limiting block. The limiting block can be locked into the limiting groove in the connector, thereby realizing the cooperation between the door frame and the door body. The rotation of the flat gears can be driven by the movement of the baffle. Compared with the fixing method of multiple sets of fixing bolts in the prior art, this is more ingenious. Moreover, the whole process does not require manual assistance. The fully automated cooperation can realize the limiting of the door frame and the door body.

[0026] Fourth, the present invention provides a limiting member on one side of the first flat gear. By providing the limiting member, the limiting tooth can limit the first flat gear, so that after the door body and door frame are fixed, the first flat gear will not easily rotate, thus preventing the limiting block from disengaging from the limiting groove, so that the door body can always remain closed when not under maintenance, ensuring the stability of the door frame and door body.

[0027] Fifth, by setting up multiple sets of air blowing pipes in an outward-spreading manner, and with each air blowing pipe's outlet extending outward from a baffle, the air from the air blowing pipes can be blown out from the four sides of the baffle, thereby acting on multiple directions of the detection port, ensuring that it can act on all the coal slag at the detection port, thus improving the quality and efficiency of coal slag recovery. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the coal mill maintenance door when it is closed, according to an embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the structure of the coal mill maintenance door when it is opened according to an embodiment of the present invention;

[0030] Figure 3 This is an embodiment of the present invention. Figure 2 Enlarged schematic diagram of the intermediate connector;

[0031] Figure 4 This is an embodiment of the present invention. Figure 3 Enlarged schematic diagram of the middle limiting component;

[0032] Figure 5 This is a schematic diagram of the rotating component structure according to an embodiment of the present invention;

[0033] Figure 6 This is an embodiment of the present invention. Figure 1 A partial sectional view from another perspective;

[0034] Figure 7 This is a partial structural schematic diagram of the dust suppression component according to an embodiment of the present invention;

[0035] Figure 8 This is an embodiment of the present invention. Figure 7 Enlarged portion of the image;

[0036] Figure 9 This is a partial structural schematic diagram of the coal mill maintenance door according to an embodiment of the present invention;

[0037] Figure 10 This is an embodiment of the present invention. Figure 9 Enlarged view of some of the structures in the image;

[0038] Figure 11 This is a partial disassembled structural diagram of the coal mill maintenance door according to an embodiment of the present invention;

[0039] Explanation of reference numerals in the attached drawings: 1. Coal mill; 2. Door frame; 3. Inspection port; 4. Fixing frame; 5. Rotating rod; 6. Door body; 7. Connector; 71. Fixing block; 72. Insert block; 73. Limiting groove; 8. Receiving component; 81. Slot; 82. Limiting block; 83. Connecting rod; 84. Rack; 85. Limiting component; 851. Limiting tooth; 852. Second spring; 853. Slide groove; 86. First spur gear; 87. Second spur gear; 88. Rotating component; 881. Connecting shaft; 882. Rotating frame; 883. Rotating column; 884. Sliding column; 885. First spring; 9. Baffle; 10. Dust suppression assembly; 11. Air blower; 12. Drive component; 121. Motor; 122. Drive shaft; 123. Threaded rod; 124. Sleeve; 125. Fixing plate; 126. Threaded block; 127. Fixing column; 128. Support tube; 129. Fixing tube; 1210. Sliding tube; 1211. Bushing; 1212. Coupling; 1213. Second through groove; 1214. First through groove; 1215. Tension spring; 13. Air collecting component; 131. Cover; 132. Fan wheel; 14. Collecting pipe. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Reference Figure 1 and Figure 2 A maintenance door for a coal mill includes a maintenance opening 3 on the coal mill 1 and a door frame 2 corresponding to the maintenance opening 3. A door body 6 is installed at the front end of the door frame 2. Two sets of fixing brackets 4 are provided on one side of the door frame 2. The front ends of the two fixing brackets 4 are connected to the door body 6 through rotating rods 5. It should be noted that two sets of fixing brackets 4 are provided. In the preferred embodiment given in this application, the number of fixing brackets 4 and rotating rods 5 can be determined by the staff according to the actual situation on site, and the dimensions of the door body 6 and the door frame 2 can be referenced. A receiving part 8 is provided on the other side of the door frame 2, and a plug-in part 7 is provided on the door body 6 at the corresponding position.

[0042] Reference Figure 2 The door frame 2 is a frame-like structure located outside the inspection port 3. The size of the inspection port 3 is no larger than the size of the door frame 2. All four sides of the door frame 2 are welded and fixed to the coal mill 1. The door frame 2 is hollow inside, and workers can enter the inspection port 3 through the hollow part in the middle of the door frame 2 to carry out maintenance on the coal mill.

[0043] Reference Figure 1 and Figure 2 The door body 6 also has a frame-like structure, and the dimensions of the door body 6 correspond to those of the door frame 2. The door body 6 can fit perfectly over the door frame 2, and the state after the two are fitted together is as follows. Figure 1 As shown, the door body 6 has an inner groove on the inner side facing the door frame 2, and a dust suppression component 10 for dust removal of the door frame 2 is installed in the inner groove.

[0044] Reference Figure 2 The connector 7 and the receiving part 8 are positioned correspondingly. When the door body 6 and door frame 2 are closed, the connector 7 engages with the receiving part 8. The connector 7 and the receiving part 8 work together to fix the door frame 2 and door body 6. It should be noted that when the door body 6 is open, such as... Figure 2 As shown, at this time, the rotating rod 5 rotates on the corresponding fixed frame 4 to achieve the rotation of the door body 6. At this time, the door body 6 and the door frame 2 are not closed. When the door body 6 and the door frame 2 are closed, they are positioned by the plug-in part 7 and the receiving part 8.

[0045] Reference Figure 2 The connector 7 includes a fixing block 71, a plug 72 and a limiting groove 73. The fixing block 71 is located on the side of the door body 6 facing away from the rotating rod 5. The fixing block 71 has a plug 72 on the side facing the door frame 2. The plug 72 has a limiting groove 73 that engages with the limiting block 82 in the connector 8.

[0046] Reference Figure 2 and Figure 3 The receiving component 8 includes a slot 81 opened on the door frame 2, and the slot 81 corresponds to the insert 72. When the door 6 is closed, the insert 72 can be inserted into the slot 81. The receiving component 8 also includes a limiting block 82, a connecting rod 83, a rack 84, a limiting component 85, a first spur gear 86, a second spur gear 87, and a rotating component 88 provided on the door frame 2. The first spur gear 86 and the second spur gear 87 are horizontally arranged and meshed. The second spur gear 87 is provided with a rotating component 88 that drives it to rotate. When the rotating component 88 rotates, it will drive the corresponding second spur gear 87 to rotate. The side of the first spur gear 86 facing away from the second spur gear 87 is provided with a limiting component 85 that limits its movement. The rack 84 is located on one side of the first spur gear 86 and meshes with it. The side of the rack 84 facing away from the first spur gear 86 is connected to the limiting block 82 through the connecting rod 83.

[0047] It should be noted here that the first spur gear 86 is limited by the function of the limiting member 85, so that after the door body 6 is fixed, the first spur gear 86 will not easily rotate, thus preventing the limiting block 82 from disengaging from the limiting groove 73, so that the door body 6 can always remain closed when not under maintenance.

[0048] When the rotating component 88 rotates, it can drive the second spur gear 87 to rotate, which in turn drives the first spur gear 86 to rotate. At the same time, since the first spur gear 86 meshes with the rack 84, it can drive the rack 84 to move horizontally, which in turn drives the corresponding limiting block 82 to move horizontally (see reference). Figure 3 (You can see the specific positional relationship between the rack 84 and the two flat gears), which in turn drives the limiting block 82 to engage in the limiting groove 73 on the insert block 72, thereby achieving the positioning of the door body 6 and the door frame 2.

[0049] Furthermore, refer to Figure 4 The limiting component 85 includes a limiting tooth 851, a second spring 852, and a sliding groove 853. The sliding groove 853 is formed on the door frame 2 located on one side of the first spur gear 86. The limiting tooth 851 is slidably disposed inside the sliding groove 853, and the side of the limiting tooth 851 facing away from the first spur gear 86 is connected to the sliding groove 853 through the second spring 852. It should be noted that when the door body 6 is fixed, under the action of the second spring 852, the limiting tooth 851 will abut against the first spur gear 86 to ensure that the first spur gear 86 will not easily rotate, thereby preventing the limiting block 82 from disengaging from the limiting groove 73, so that the door body 6 can always remain closed when not under maintenance.

[0050] Furthermore, refer to Figure 5 The rotating component 88 includes a connecting shaft 881, a rotating frame 882, a rotating column 883, a sliding column 884, and a first spring 885. The connecting shaft 881 is located at the axis of the second spur gear 87. The rotating frame 882 is fixed on the connecting shaft 881, and the rotating column 883, which is slidably connected to the door frame 2, is fixedly connected to the rotating frame 882. That is, the front end of the rotating column 883 extends out of the door frame 2, and a groove is opened on the door frame 2 for this section, so that the rotating column 883 can slide in the groove. The sliding column 884 is connected to the front end of the rotating column 883 through the first spring 885. The top end of the sliding column 884 is tapered.

[0051] It should be noted that since the front end of the rotating column 883 can extend a portion of the door frame 2, when the baffle 9 inside the dust suppression assembly 10 is driven to move toward the inspection port 3, the baffle 9 can just press the front end of the rotating column 883 and drive the rotating column 883 to rotate toward the inspection port 3. At this time, the excess of the rotating column 883 can be buffered by the first spring 885, thereby ensuring that the rotating column 883 can rotate along the axis, thereby driving the second spur gear 87 to rotate, thereby driving the first spur gear 86 to rotate, and then driving the limiting block 82 to engage in the limiting groove 73 inside the chamfer 72 according to the principle described above, thereby fixing the door frame 2 and the door body 6.

[0052] Reference Figure 6The dust suppression component 10 includes a baffle 9, a drive component 12 and an air collecting component 13 mounted on the door 6. The drive component 12 drives the baffle 9 to move to the inspection port 3. The baffle 9 is equipped with a blowing component for dust removal between the baffle and the inspection port. The air collecting component 13 is connected to the blowing component through a pipe, that is, the air collecting component 13 provides airflow to the blowing component.

[0053] Furthermore, refer to Figure 6 The blowing assembly includes several sets of blowing pipes 11, all of which are connected to a manifold 14. It should be noted that the specific number of sets of blowing pipes 11 depends on the actual size of the baffle 9, and this application does not limit it. In this application, the several sets of blowing pipes 11 are arranged in a divergent manner, with all inner ends connected to the manifold 14 and outer ends facing the four sides of the baffle 9. Each blowing pipe 11 faces a different direction, which can act on the inspection port 3 from multiple angles, ensuring more comprehensive slag removal from the inspection port 3. The manifold 14 can be located in the middle of the baffle 9. The manifold 14 and the blowing pipes 11 are both located inside the baffle 9, and the blowing port of each blowing pipe 11 extends from the side wall of the baffle 9. The side of the manifold 14 facing away from the door frame 2 is connected to the fixing plate 125 on the drive component 12.

[0054] Reference Figure 7 The driving component 12 includes a motor 121, a drive shaft 122, a threaded rod 123, a sleeve 124, and a fixing plate 125. The motor 121 can drive the sleeve 124 to make linear motion outside the threaded rod 123. One end of the sleeve 124 is detachably installed with the baffle 9 via bolts or pins through the fixing plate 125. The inside of the sleeve 124 is threadedly connected to the threaded rod 123. The end of the threaded rod 123 facing away from the sleeve 124 is connected to the coupling 1212 via the drive shaft 122, and then connected to the motor 121. A second through slot 1213 is opened on 22. When in use, the motor 121 is started. The motor 121 can drive the drive shaft 122 and the threaded rod 123 to rotate through the coupling 1212. At this time, the sleeve 124 can move linearly along the direction of the threaded rod 123, thereby realizing the linear movement of the baffle 9. This process is the movement process of the baffle 9. The baffle 9 can be moved from inside the door 6 to the inspection port 3. At this time, the slag in the inspection port 3 can be blown away by the air blowing component inside the baffle 9. After the end, it is moved back into the door 6 from the inspection port 3.

[0055] Furthermore, a fixed post 127 is provided at one end of the threaded rod 123 facing the sleeve 124, and a threaded block 126 is provided at one end of the sleeve 124 facing the threaded rod 123. The threaded block 126 is threadedly connected to the threaded rod 123 to enable the threaded block 126 to move linearly along the outside of the threaded rod 123. The threaded block 126 is rotatably connected to the fixed post 127. When the baffle 9 moves to the inspection port 3, the sleeve 124 moves to the end of the threaded rod 123, that is, the threaded block 126 moves to the outside of the fixed post 127. At this time, no threads are provided on the fixed post 127. Therefore, when the motor continues to rotate, the rotation of the threaded rod 123 will not drive the baffle 9 to continue to move. At this time, the sleeve 124 will not continue to move forward. This is the final position of the baffle 9 moving to the inspection port 3.

[0056] Furthermore, the sleeve 124 is provided with a sliding tube 1210 inside. One end of the sliding tube 1210 is connected to the blower assembly inside the baffle 9. The outer surface of the sliding tube 1210 is movably connected to the fixed tube 129 inside the threaded rod 123 and is connected to the tension spring 1215 inside the fixed tube 129. A first through groove 1214 is opened at the end of the fixed tube 129 facing away from the sliding tube 1210. The arrangement of the first through groove 1214, the sliding tube 1210 and the fixed tube 129 can be used to transmit the air force of the blower assembly.

[0057] It is important to note here that when the motor drives the sleeve 124 to move linearly outside the threaded rod 123, the sliding tube 1210 inside the sleeve 124 also moves inside the fixed tube 129, pulling the tension spring 1215 back and forth. When the baffle 9 moves to the position of the inspection port 3, the sleeve 124 is exactly moved to the outside of the fixed post 127, at which point the tension spring 1215 is subjected to the maximum tension force (e.g., Figure 11 As shown), the tension spring 1215 here can also ensure the stability of the sleeve 124 outside the fixed post 127;

[0058] During the movement of the baffle 9, the sliding tube 1210 is fixedly connected to the collecting tube 14. Therefore, as the collecting tube 14 moves with the baffle 9, it will pull the sliding tube 1210 to move. Since the fixed tube 129 is connected to the sliding tube 1210, the transmission of wind power is realized. During this process, the movement of the sliding tube 1210 will cause the tension spring 1215 to stretch. Therefore, when the motor 121 reverses, the sliding tube 1210 will have a pulling force towards the fixed tube 129 due to the action of the tension spring 1215. Therefore, there is a pulling force on both the collecting tube 14 and the baffle 9. Due to the pulling force, the threaded block 126 and the threaded rod 123 are tightly fitted. Therefore, when the threaded rod 123 reverses, it can drive the threaded block 126 to move in the opposite direction and reset. Thus, it drives the baffle 9 to move in the opposite direction and reset, thereby facilitating the opening of the door 6 for maintenance work.

[0059] Reference Figure 9 and Figure 10 The air collecting component 13 is located on the outside of the drive shaft 122. A support pipe 128 is detachably installed on the side of the air collecting component 13 facing the door body 6, and the other end of the support pipe 128 is detachably installed to the door body 6 (e.g., Figure 6 As shown, the threaded rod 123 is located inside the support tube 128, and the two do not contact each other; the air collector 13 has a detachable bushing 1211 installed on the side facing away from the door body 6, one end of the bushing 1211 is connected to the motor 121, the drive shaft 122 and the coupling 1212 are both located inside the bushing 1211 and do not contact the bushing 1211, so the bushing 1211 is used to protect the drive shaft 122, and when the motor drives the drive shaft 122 to rotate, the outer bushing 1211 does not rotate with it; at the same time, the support tube 128 is used to protect the threaded rod 123, and when the motor drives the threaded rod 123 to rotate, the support tube 128 does not rotate either. The other end of the support tube 128 is fixed to the door body 6, which can not only support the threaded tube 123, but also provide some support for the motor.

[0060] Furthermore, the air collecting component 13 includes a cover 131 and a fan wheel 132. The fan wheel 132 is rotatably connected inside the cover 131. The shaft of the fan wheel 132 is fixedly connected to the drive shaft 122. The continuous rotation of the motor 121 will cause the drive shaft 122 to drive the fan wheel 132 to rotate, thereby generating wind power through the rotating fan wheel 132. Therefore, the wind is delivered to the fixed pipe 129 through the action of the first through groove 1214 and the second through groove 1213, and then delivered to the collecting pipe 14 through the sliding pipe 1210. Finally, the wind is blown out through the blowing pipe 11.

[0061] The specific operating principle of this application is as follows: After overhauling the coal mill 1, the door 6 is closed, at which point the insert 72 is inserted into the slot 81 and limited by the limiting block 82 (refer to the above description regarding the fixing of the limiting block 82 and the insert 72); then the motor 121 is started, which in turn drives the coupling 1212 to rotate, thus driving the drive shaft 122 to rotate, which in turn drives the threaded rod 123 to rotate, thus causing the threaded block 126 to move linearly outside the threaded rod 123, which in turn drives the sleeve 124 to move. The movement of the sleeve 124 will drive the fixing plate 125 to move, thus driving the baffle 9 to move. When the baffle 9 moves to be flush with the inspection port 3, the threaded block 126 is located on the outer surface of the fixing column 127 and just disengages from the threaded rod 123 (e.g., Figure 8 As shown), the threaded block 126 stops moving, thereby causing the baffle 9 to stop moving. Since the threaded block 126 is disengaged from the threaded rod 123, the rotation of the threaded rod 123 will not cause the baffle 9 to continue moving while the motor 121 continues to rotate.

[0062] At this time, the continuous rotation of the motor 121 will cause the drive shaft 122 to drive the impeller 132 to rotate, thereby generating wind power through the rotating impeller 132. The wind is then transported to the fixed pipe 129 through the action of the first through slot 1214 and the second through slot 1213, and then transported to the collection pipe 14 through the sliding pipe 1210. Finally, the wind is blown out through the blowing pipe 11. Therefore, the wind will be blown out through the gap between the baffle 9 and the inspection port 3, preventing coal dust from accumulating in the gap. Thus, the dust suppression component 10 and the dust blowing component ensure that coal dust does not accumulate in large quantities in the door frame 2 and the gap.

[0063] During the movement of the baffle 9, it should be noted that the sliding tube 1210 is fixedly connected to the collecting tube 14. Therefore, as the collecting tube 14 moves with the baffle 9, it will pull the sliding tube 1210 to move. Since the fixed tube 129 is connected to the sliding tube 1210, the transmission of wind power is realized. During this process, the movement of the sliding tube 1210 will cause the tension spring 1215 to be stretched. Therefore, when the motor 121 reverses, the sliding tube 1210 will have a pulling force towards the fixed tube 129 due to the action of the tension spring 1215. Therefore, there is a pulling force on both the collecting tube 14 and the baffle 9. Due to the pulling force, the threaded block 126 and the threaded rod 123 are tightly fitted. Therefore, when the threaded rod 123 reverses, it can drive the threaded block 126 to move in the opposite direction and reset. Thus, it drives the baffle 9 to move in the opposite direction and reset, thereby facilitating the opening of the door 6 for maintenance work.

[0064] It should be noted that during the forward and backward resetting process of the baffle 9, the movement of the baffle 9 will drive the sliding column 884 to move. Therefore, the sliding column 884 will drive the rotating column 884, the rotating frame 882, and the connecting shaft 881 to rotate, which in turn drives the second spur gear 87 to rotate. Thus, the rotation of the second spur gear 87 causes the first spur gear 86 to rotate, which in turn drives the rack 84 to move. This drives the connecting rod 83 to move, which in turn drives the limiting block 82 to move. When the baffle 9 moves forward, the connecting rod 83 drives the limiting block 82 to insert into the limiting groove 73, thus fixing the door 6. When the baffle 9 moves in the opposite direction, the connecting rod 83 drives the limiting block 82 to move in the opposite direction and disengage from the limiting groove 73, thus facilitating the opening of the door 6. During this process, the limiting tooth 851 limits the first spur gear 86, so that after the door body 6 is fixed, the first spur gear 86 will not easily rotate, thus preventing the limiting block 82 from disengaging from the limiting groove 73, so that the door body 6 can always remain closed when not under maintenance.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A maintenance door for a coal mill, comprising a maintenance opening (3) on the coal mill (1) and a door frame (2) corresponding to the maintenance opening, wherein a door body (6) is installed on the door frame (2), characterized in that: The door body (6) and the door frame (2) are detachably installed through a plug-in positioning component. A dust suppression component (10) for dust removal of the door frame (2) is installed on the door body (6). The dust suppression component (10) includes a baffle (9), a drive component (12), and an air collector (13). The drive component (12) drives the baffle (9) to move to the inspection port (3). The baffle (9) is equipped with a blowing component. The air collector (13) is connected to the blowing component through a pipe. The air collector (13) provides airflow to the blowing component. The air outlet of the blowing component can act on the gap between the baffle (9) and the inspection port (3) at multiple angles. The blowing assembly includes several sets of blowing pipes (11) arranged in a divergent manner, and the air in the several sets of blowing pipes (11) is sprayed out from the air outlet in different directions. The blower assembly also includes a manifold (14), and several sets of blower pipes (11) are connected to the manifold (14). The manifold (14) and the blower pipes (11) are both located inside the baffle (9), and the air outlet of each blower pipe (11) extends from the side wall of the baffle (9). The air coming out of the blower pipe is blown out through the gap between the baffle (9) and the inspection port (3). The manifold (14) is connected to the drive unit (12) on the side facing away from the door frame (2). The driving component (12) is provided on the door body (6), and the driving component (12) includes a motor (121), a drive shaft (122), a threaded rod (123), a sleeve (124) and a fixing plate (125). The motor (121) can drive the sleeve (124) to make linear motion outside the threaded rod (123). One end of the sleeve (124) is detachably installed with the baffle (9) via a fixing piece (125). The inside of the sleeve (124) is threadedly connected to the threaded rod (123). The end of the threaded rod (123) facing away from the sleeve (124) is connected to the coupling (1212) via the drive shaft (122) and then connected to the motor (121). A second through groove (1213) is opened on the drive shaft (122).

2. The maintenance door for a coal mill according to claim 1, characterized in that: The plug-in positioning component includes a plug-in component (7) and a receiving component (8), wherein the plug-in component (7) is located on one side of the door body (6), and the receiving component (8) is located on the door frame (2). The plug-in component (7) engages with the receiving component (8) when the door body (6) and the door frame (2) are closed.

3. A maintenance door for a coal mill according to claim 2, characterized in that: The connector (7) includes a fixing block (71), a plug (72) and a limiting groove (73). The fixing block (71) is located on one side of the door body (6). The fixing block (71) has a plug (72) on the side facing the door frame (2). The plug (72) has a limiting groove (73) that engages with the connector (8).

4. A maintenance door for a coal mill according to claim 2, characterized in that: The receiving component (8) includes a slot (81), a limiting block (82), a rack (84), a first spur gear (86), a second spur gear (87), and a rotating component (88). The first spur gear (86) and the second spur gear (87) are mounted on the door frame (2) and mesh with each other. The second spur gear (87) is provided with a rotating component (88) that drives it to rotate. The first spur gear (86) is provided with a limiting component (85) on one side to limit its movement.

5. A maintenance door for a coal mill according to claim 4, characterized in that: The rack (84) is located on one side of the first spur gear (86) and the two mesh. The side of the rack (84) facing away from the first spur gear (86) is connected to the limiting block (82) via a connecting rod (83).

6. A maintenance door for a coal mill according to claim 1, characterized in that: The sleeve (124) has a sliding tube (1210) inside. One end of the sliding tube (1210) is connected to the blower assembly. The outer surface of the sliding tube (1210) is movably connected to the fixed tube (129) inside the threaded rod (123) and connected to the tension spring (1215) inside the fixed tube (129). The fixed tube (129) has a first through groove (1214) at the end opposite to the sliding tube (1210).

7. A maintenance door for a coal mill according to claim 1, characterized in that: The threaded rod (123) is provided with a fixed post (127) at one end facing the sleeve (124), and the sleeve (124) is provided with a threaded block (126) at one end facing the threaded rod (123). The threaded block (126) and the threaded rod (123) are connected by a thread, and the threaded block (126) and the fixed post (127) are connected by a rotation.

8. A maintenance door for a coal mill according to claim 1, characterized in that: The air collecting component (13) is located on the outside of the drive shaft (122). The air collecting component (13) is detachably mounted with a support tube (128) on the side facing the door body (6). The other end of the support tube (128) is detachably mounted to the door body (6). The threaded rod (123) is located inside the support tube (128) and the two do not contact each other.

9. A maintenance door for a coal mill according to claim 8, characterized in that: The air collecting component (13) has a detachable bushing (1211) on the side facing away from the door body (6). One end of the bushing (1211) is connected to the motor (121). The drive shaft (122) and the coupling (1212) are both located inside the bushing (1211) and do not contact the bushing (1211).

10. A maintenance door for a coal mill according to claim 1, characterized in that: The air collecting component (13) includes a cover (131) and a wind wheel (132). The wind wheel (132) is rotatably connected inside the cover (131), and the axis of the wind wheel (132) is fixedly connected to the drive shaft (122).

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