A medium-speed coal mill maintenance device

Abstract

The present invention discloses a maintenance device for a medium-speed coal mill, which includes a protective shell, a grinding roller, a dust cleaning mechanism and an auxiliary positioning mechanism. An auxiliary reset wheel is arranged at the upper end position of the outer surface of the protective shell. The auxiliary reset wheel is embedded inside the upper end of the protective shell, and the upper end of the auxiliary reset wheel is higher than the upper end of the protective shell. For the maintenance device of the medium-speed coal mill of the present invention, when the grinding roller is being maintained, the maintenance device is flipped from the horizontal position to the vertical position. At this time, the lower end of the turning grinding top rod can support the auxiliary reset wheel, causing the auxiliary reset wheel to move downward. The sliding side plate on the side of the auxiliary reset wheel drives the piston at the lower end of the movable rod to squeeze the airbag. After the airbag is squeezed, an air flow can be generated in the exhaust pipe, and the air flow is blown onto the surface of the support plate through two transverse blow pipes connected to the front end of the exhaust pipe. By adopting this method, it is possible to blow the coal ash on the surface of the support plate when the maintenance device is flipped to the vertical state, preventing the support plate from entering the inner surface of the medium-speed coal mill with attached coal ash.

Description

Technical Field

[0001] The present invention relates to an overhaul device, and particularly to an overhaul device for a medium-speed coal mill. Background Art

[0002] A medium-speed coal mill refers to a coal mill with a working speed of 50 - 300 r / min, belonging to the professional equipment for the preparation of auxiliary materials in blast furnace ironmaking. The medium-speed coal mill can provide suitable auxiliary materials - pulverized coal for the blast furnace ironmaking system. The medium-speed coal mill is suitable for the pulverization of medium-hard materials such as bituminous coal and lean coal, and can be widely used in the powder-making systems of industries such as electric power, metallurgy, building materials, and chemical industry, especially in the pulverized coal injection system for blast furnaces that requires a large amount of bituminous coal. The medium-speed coal mill is the most important large equipment in the coal-to-oil powder-making system, and its operation safety and economy are extremely important for the normal operation of coal-to-oil.

[0003] In this regard, Chinese Patent Application No.: CN214390583U discloses an overhaul device for a side coal bunker coal mill, which relates to the technical field of the boiler powder-making system in a thermal power plant. It includes a main vehicle, a fixed single rail, and a sub-vehicle. The sub-vehicle is an electric single-girder crane for the overhaul span of the coal mill. The bottom elevations of the short rail and the long rail are the same as the bottom elevation of the single-girder suspended crane of the main vehicle. The short rail extends to directly above the coal mill, and the two long rails are symmetrically arranged on both sides of the coal mill. The utility model makes the overhaul of the main body components of the coal mill convenient and flexible, facilitates on-site overhaul, is convenient for vertically lifting larger overhaul components, reduces the requirements for overhaul equipment and structural beams, and reduces costs.

[0004] In this regard, Chinese Patent Application No.: CN216261281U discloses an overhaul turning-out device for the grinding roller of a unit boiler coal mill. The present utility model includes: a boiler body, in which a grinding disc is installed. Notches are opened on both sides of the boiler body. Above the grinding disc is a motor, and the output end of the motor is connected to a grinding roller. A fixed rod is installed on one side of the motor. It also includes a turning-out device connected to one side of the fixed rod and installed on one side of the boiler body. The turning-out device is composed of a turning-out structure and a pushing structure. The turning-out structure includes a fixing plate, and movable rods are installed on both sides of the fixing plate. The beneficial effects of the present utility model are: when the telescopic rod contracts, it drives the fixing block fixedly connected to one side of the third fixing block to move away from the boiler body, and the limiting block moves downward along the limiting groove, driving the grinding roller to turn out from the notch, resulting in a larger maintenance space, simple operation, convenient maintenance, reduced workload, short construction period, and improved work efficiency.

[0005] As described in combination with the above-mentioned comparative documents and the prior art, currently during the overhaul process of medium-speed coal mills, since the structures such as the grinding rollers and liner plates of medium-speed coal mills are all arranged inside the machine body, in reality, there are many floating coal powder particles inside the medium-speed coal mill. When the overhaul device is installed on the medium-speed coal mill, the structure carrying the grinding roller is prone to adhering to coal dust particles, and it is easy to slide when the grinding roller contacts the bearing structure of the overhaul device. In addition, due to the large weight of the grinding roller in practice, the grinding roller bearing mechanism of the overhaul device is prone to generating cracks under the long-term pressure of the grinding roller. If the cracks are not processed in time, it is easy to cause fractures. Summary of the Invention

[0006] The purpose of the present invention is to provide an overhaul device for a medium-speed coal mill to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above purpose, the present invention provides the following technical solution: An overhaul device for a medium-speed coal mill, including a protective shell, a grinding roller, a dust cleaning mechanism, and an auxiliary positioning mechanism. An auxiliary reset wheel is arranged at the upper end position of the outer surface of the protective shell. The auxiliary reset wheel is embedded inside the upper end of the protective shell, and the upper end of the auxiliary reset wheel is higher than the upper end of the protective shell. Both sides of the auxiliary reset wheel are fixedly connected with rotating shafts. The two rotating shafts are respectively rotatably connected inside two sliding side plates. Both lower ends of the two sliding side plates are fixedly connected with dampers. The lower ends of the dampers are fixedly connected to the upper surface of a positioning block. The positioning block is fixedly connected with the protective shell. A dust cleaning mechanism is arranged inside the protective shell. An activity rod is arranged inside the dust cleaning mechanism. The upper end of the activity rod is fixedly connected to the lower surface of the sliding side plate. The other end of the activity rod is fixedly connected to the upper surface of a piston. The piston is arranged inside an internal cavity. The internal cavity is arranged inside the protective shell. An airbag is arranged at the lower end of the piston. The lower end of the airbag is fixedly connected with an exhaust pipe. The other end of the exhaust pipe is fixedly connected with two horizontal dust blowing pipes. The two horizontal dust blowing pipes are arranged on the upper and lower sides of the outer surface of a support plate. A plurality of dust blowing holes are equidistantly arranged on the outer surface of the horizontal dust blowing pipes. Both sides of the protective shell are rotatably connected with upper pull rods. The inner ends of the upper pull rods are rotatably connected inside the upper connecting plates. The upper connecting plates are arranged outside the liner plates. The upper connecting plates and the liner plates are fixed by screws. The grinding roller is rotatably connected inside the liner plates. The lower end of the grinding roller is arranged on the upper surface of the support plate. The support plate is fixedly connected to the inside of the protective shell. The upper surface of the support plate is a stepped structure. The shape of the contact part between the support plate and the grinding roller matches each other.

[0008] A crack repair box is arranged on one side of the upper surface of the support plate. The crack repair box is fixedly connected with the protective shell. Two floating balls are arranged inside the crack repair box. A floating plate is fixedly connected between the two floating balls. Scale tables are arranged on both sides of the crack repair box. A detection solution is arranged inside the crack repair box.

[0009] As a preferred technical solution of the present invention, an auxiliary positioning mechanism is provided at the upper end of the protective shell, and a threaded ring, a grinding top rod and a rotating disk are arranged inside the auxiliary positioning mechanism.

[0010] Through the above technical solution, an extended supplementary description is as follows: When cracks occur between the support plate and the protective shell under the long-term pressure of the grinding roller, the thermosetting resin and part of the epoxy glue can be injected into the crack position, and the generated cracks are adhesively repaired by the adhesive substance, which can reduce the subsequent fracture situation to a certain extent. In addition, the staff can observe the liquid level of the adhesive substance through the liquid level gauge. When the liquid level decreases, it indicates that cracks have occurred, which can play a reminder role for the maintenance personnel.

[0011] As a preferred technical solution of the present invention, the lower end of the grinding top rod is arranged on the upper surface of the protective shell. An upper bearing cylinder is arranged in the middle of the grinding top rod, and support rods are fixedly connected to the four corners of the upper surface of the upper bearing cylinder, and the support rods are fixedly connected to the lower surface of the threaded ring.

[0012] Through the above technical solution, an extended supplementary description is as follows: Since the grinding top rod and the threaded ring are connected by threads, when the grinding top rod rotates, it can move up and down within the threaded ring. By adopting this method, the lower end of the grinding top rod can top the upper end position of the protective shell.

[0013] As a preferred technical solution of the present invention, the grinding top rod penetrates through the middle of the threaded ring, the grinding top rod is threadedly connected to the threaded ring, and a rotating disk is fixedly connected to the upper end of the grinding top rod.

[0014] Through the above technical solution, an extended supplementary description is as follows: When the detection device is pulled into a vertical state, by manually rotating the rotating disk, the grinding top rod rotates, thereby playing a role of temporarily fixing the detection device, which is convenient for the staff to subsequently connect the device to the barrel wall of the medium-speed coal mill.

[0015] As a preferred technical solution of the present invention, a lower rotating shaft is rotatably connected to the lower end of the protective shell, and a lower bearing cylinder is arranged through the outer side of the lower end of the lower rotating shaft.

[0016] Through the above technical solution, an extended supplementary description is as follows: The lower bearing cylinder and the lower barrel wall are connected by means of screw reinforcement, that is, when subsequently installing and disassembling the device and the medium-speed coal mill, the bolts can be tightened or unscrewed.

[0017] As a preferred technical solution of the present invention, a rotating shaft is rotatably connected to both sides of the lower bearing cylinder, and both ends of the two rotating shafts penetrate through the outer sides of the two lower connecting plates respectively.

[0018] Through the above technical solution, an extended supplementary description is as follows: During maintenance, the screws between the lower bearing cylinder at the lower end and the lower cylinder wall do not need to be removed. That is, the lower bearing cylinder at the lower end and the lower cylinder wall are rotatably connected, and the state where the grinding roller flips can take the lower cylinder wall as the rotation point for flipping.

[0019] As a preferred technical solution of the present invention, the inner side of the upper bearing cylinder is fixedly connected to the outer side of the upper cylinder wall, and the upper bearing cylinder and the upper cylinder wall are fixedly connected by screws.

[0020] Through the above technical solution, an extended supplementary description is as follows: The grinding roller is directly supported by a support plate below, and the shape of the contact part between the support plate and the grinding roller matches that of the grinding roller. This method is convenient to operate and solves the disadvantage that it was difficult to install using bolt connections before.

[0021] As a preferred technical solution of the present invention, the lower connecting plate is arranged on the outer side of the lower cylinder wall, and the lower connecting plate and the lower cylinder wall are fixedly connected by screws.

[0022] Through the above technical solution, an extended supplementary description is as follows: The method of fixed connection by screws can be used by workers for the installation and removal of the maintenance device and the medium-speed coal mill.

[0023] As a preferred technical solution of the present invention, a lifting lug is fixedly connected to the middle of the outer surface of the protective shell, and a rope hole is arranged in the middle of the lifting lug.

[0024] Through the above technical solution, an extended supplementary description is as follows: Connect a rope to the lifting lug, and connect the other end of the rope to a crane. By tightening the rope, the entire maintenance device can be brought into contact with the cylinder wall of the medium-speed coal mill, facilitating the installation of the maintenance device by maintenance personnel.

[0025] As a preferred technical solution of the present invention, the upper cylinder wall and the lower cylinder wall are the cylinder wall structures of the medium-speed coal mill.

[0026] Through the above technical solution, an extended supplementary description is as follows: The upper cylinder wall and the lower cylinder wall belong to the outer box structure of the medium-speed coal mill, and the upper cylinder wall and the lower cylinder wall are provided with slots in the middle. The slot positions between the upper cylinder wall and the lower cylinder wall can be used for the flipping of the grinding roller.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. Through the ash cleaning mechanism provided in the present invention, when overhauling the grinding roller, the overhaul device is flipped from the horizontal position to the vertical position. At this time, the lower end of the grinding top rod can support the auxiliary reset wheel, causing the auxiliary reset wheel to move downward. The sliding side plate on the side of the auxiliary reset wheel drives the piston at the lower end of the movable rod to squeeze the airbag. After the airbag is squeezed, an air flow can be generated in the exhaust pipe, and the two transverse blow ash pipes connected to the front end of the exhaust pipe blow on the surface of the support plate. In this way, a horizontally flowing air flow can be formed on the surface of the support plate when the overhaul device is flipped to the vertical state. When the support plate enters the coal mill to connect with the grinding roller, due to the protection of the flowing air flow on its surface, coal slag and other foreign objects will not fall on the surface, thus avoiding the situation of increasing new wear between the grinding roller and the support plate and unstable lifting caused by foreign objects;

[0029] 2. Through the crack repair box provided in the present invention, the crack repair box is internally provided with a thermosetting resin and an adhesive substance of partial epoxy glue. When cracks are generated between the support plate and the protective shell under the long-term pressure of the grinding roller, the thermosetting resin and partial epoxy glue can automatically repair the generated cracks, which can reduce the subsequent fracture situation to a certain extent. In addition, the staff can observe the position of the floating ball relative to the scale. When the detection solution decreases, it indicates that cracks have occurred, which can play a reminder role for the overhaul personnel. Subsequently, it is necessary to timely overhaul or replace the support plate. Injecting gap filling only realizes a simple reinforcement operation for the gap when the personnel do not find the gap, playing a certain auxiliary stabilizing role, but cannot replace the maintenance operation;

[0030] 3. Through the auxiliary reset wheel provided in the present invention, after the grinding roller is turned out of the medium-speed coal mill for overhaul and then pulled back into the medium-speed coal mill again, when the overhaul device is pulled back to the vertical state, the auxiliary reset wheel at the upper end position of the protective shell can contact the grinding top rod. During the contact process between the two, the auxiliary reset wheel can rotate, enabling the grinding top rod to return to the upper end position of the protective shell more smoothly. In addition, the auxiliary reset wheel can move in the vertical direction and is reset by a damper. In this way, there will be no jamming when the grinding roller is reset. In addition, the grinding roller is directly supported by a support plate below, and the shape of the contact part between the support plate and the grinding roller matches the grinding roller. This method is convenient to operate and solves the disadvantage that it was difficult to install with bolts below before;

[0031] 4. Through the grinding top rod provided in the present invention, during the process of the grinding roller retracting into the medium-speed coal mill, when the detection device is pulled into the vertical state, by manually rotating the rotating disk, the grinding top rod rotates. Since the grinding top rod is threadedly connected to the threaded ring, when the grinding top rod rotates, it can move up and down within the threaded ring. In this way, the lower end of the grinding top rod can support the upper end position of the protective shell, thereby playing a temporary fixing role for the detection device and facilitating the subsequent connection of the device to the barrel wall of the medium-speed coal mill by the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic front - side structure diagram of the present invention;

[0033] Figure 2 It is a schematic rear - side structure diagram of the present invention;

[0034] Figure 3 It is a schematic structure diagram of the present invention from an obliquely upward perspective;

[0035] Figure 4 It is a schematic structure diagram of the pallet in the present invention;

[0036] Figure 5 It is a side cross - sectional view of the present invention;

[0037] Figure 6 For the present invention Figure 5 An enlarged view of A;

[0038] Figure 7 It is a cross - sectional view of the crack repair box in the present invention;

[0039] Figure 8 It is a schematic structure diagram of the auxiliary reset wheel in the present invention.

[0040] In the figure: 1, upper bearing cylinder; 2, protective shell; 3, upper pull rod; 4, upper connecting plate; 5, lifting lug; 6, pallet; 7, lower bearing cylinder; 8, upper cylinder wall; 9, lower cylinder wall; 10, grinding roller; 11, lining tile; 12, ash - cleaning mechanism; 1201, movable rod; 1202, built - in cavity; 1203, airbag; 1204, piston; 1205, exhaust pipe; 1206, transverse ash - blowing pipe; 13, auxiliary positioning mechanism; 1301, threaded ring; 1302, support rod; 1303, turning and grinding top rod; 1304, rotating disk; 14, lower connecting plate; 15, rotating shaft; 16, crack repair box; 17, auxiliary reset wheel; 18, sliding side plate; 19, damper; 20, positioning block; 21, scale; 22, lower rotating shaft; 23, floating ball; 24, floating plate. Specific embodiments

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0042] Please refer to Figures 1-8 , the present invention provides a technical solution for a medium - speed coal mill maintenance device:

[0043] According to Figure 1, Figure 2 and Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown in Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , a maintenance device for a medium-speed coal mill includes a protective shell 2, a grinding roller 10, a dust cleaning mechanism 12 and an auxiliary positioning mechanism 13. At the upper end position of the outer surface of the protective shell 2, an auxiliary reset wheel 17 is arranged. The auxiliary reset wheel 17 is embedded in the upper end inside the protective shell 2, and the upper end of the auxiliary reset wheel 17 is higher than the upper end of the protective shell 2. Both sides of the auxiliary reset wheel 17 are fixedly connected with a rotating shaft 15. The two rotating shafts 15 are respectively rotatably connected to the inner sides of two sliding side plates 18. The lower ends of the two sliding side plates 18 are both fixedly connected with a damper 19. The lower end of the damper 19 is fixedly connected to the upper surface of a positioning block 20. When the auxiliary reset wheel 17 descends to the lowest state, the airbag 1203 is completely squeezed, so that an air flow with sufficient intensity can be generated in the transverse blowpipe 1206. The positioning block 20 is fixedly connected with the protective shell 2. A dust cleaning mechanism 12 is arranged inside the protective shell 2. An activity rod 1201 is arranged inside the dust cleaning mechanism 12. The upper end of the activity rod 1201 is fixedly connected to the lower surface of the sliding side plate 18. The other end of the activity rod 1201 is fixedly connected to the upper surface of a piston 1204. The piston 1204 is arranged inside an internal cavity 1202. The internal cavity 1202 is arranged inside the protective shell 2. An airbag 1203 is arranged at the lower end of the piston 1204. The lower end of the airbag 1203 is fixedly connected with an exhaust pipe 1205. The other end of the exhaust pipe 1205 is fixedly connected with two transverse blowpipes 1206. The two transverse blowpipes 1206 are arranged on the upper and lower sides of the outer surface of a support plate 6. A plurality of blowholes are equidistantly arranged on the outer surface of the transverse blowpipe 1206. Both sides of the protective shell 2 are rotatably connected with an upper pull rod 3. The inner end of the upper pull rod 3 is rotatably connected to the inner side of an upper connecting plate 4. The upper connecting plate 4 is arranged outside a lining tile 11. The upper connecting plate 4 and the lining tile 11 are fixedly connected by screws. The grinding roller 10 is rotatably connected to the inner side of the lining tile 11. The lower end of the grinding roller 10 is arranged on the upper surface of the support plate 6. The support plate 6 is fixedly connected to the inner side of the protective shell 2. The upper surface of the support plate 6 is a stepped structure. The shapes of the contact parts between the support plate 6 and the grinding roller 10 match each other.

[0044] According to Figure 7As shown in the figure, a crack repair box 16 is provided on one side of the upper surface of the pallet 6. The crack repair box 16 is fixedly connected to the protective shell 2. Two floating balls 23 are arranged inside the crack repair box 16. A floating plate 24 is fixedly connected between the two floating balls 23. Scale tables 21 are arranged on both sides of the crack repair box 16. A detection solution is arranged inside the crack repair box 16. The detection solution is a mixture of thermosetting resin and epoxy glue. The mixing ratio of thermosetting resin to epoxy glue is 3:7. The thermosetting resin is soft when not heated and has a certain fluidity in combination with the epoxy glue. In this way, when encountering a gap, it will enter the gap along the gap by itself and fill the gap. After being heated by the heat of the grinding roller 10 itself, it will solidify and adhere to the gap, generating temporary and a certain degree of rigidity and viscosity, strengthening and filling the gap, and maintaining the temporary stability of the pallet 6. When the staff repairs the grinding roller 10, they can accurately and timely know whether there is a gap by observing the change of the relative scale table 21, so as to make timely treatment. The detection solution mainly plays a role of detection and prompt, and plays a certain degree of bonding and rigid support role briefly and quickly.

[0045] According to Figure 3 and Figure 6 As shown in the figure, an auxiliary reset wheel 17 is provided at the upper end position of the outer surface of the protective shell 2. The auxiliary reset wheel 17 is embedded inside the upper end of the protective shell 2, and the upper end of the auxiliary reset wheel 17 is higher than the upper end of the protective shell 2. Rotating shafts 15 are fixedly connected to both sides of the auxiliary reset wheel 17. The two rotating shafts 15 are respectively rotatably connected to the inner sides of the two sliding side plates 18. Dampers 19 are fixedly connected to the lower ends of the two sliding side plates 18. When the maintenance device is pulled back to the vertical state, the auxiliary reset wheel 17 at the upper end position of the protective shell 2 can contact the grinding top rod 1303. During the contact process between the two, the auxiliary reset wheel 17 can rotate, making the grinding top rod 1303 return to the upper end position of the protective shell 2 more smoothly. In addition, the auxiliary reset wheel 17 can move in the vertical direction and is reset by the damper 19. By adopting this method, there will be no jamming when the grinding roller 10 is reset. When the maintenance device is pulled back to the vertical state, the auxiliary reset wheel 17 at the upper end position of the protective shell 2 can contact the grinding top rod 1303. During the contact process between the two, the auxiliary reset wheel 17 can rotate, making the grinding top rod 1303 return to the upper end position of the protective shell 2 more smoothly. The lower end of the damper 19 is fixedly connected to the upper surface of the positioning block 20, and the positioning block 20 is fixedly connected to the protective shell 2.

[0046] According to Figure 1 and Figure 2As shown, an auxiliary positioning mechanism 13 is provided on the upper surface of the protective shell 2. Inside the auxiliary positioning mechanism 13, there are a thread ring 1301, a grinding ejector rod 1303, and a rotating disk 1304. The lower end of the grinding ejector rod 1303 is arranged on the upper surface of the protective shell 2. An upper bearing cylinder 1 is arranged in the middle of the grinding ejector rod 1303. Four corners of the upper surface of the upper bearing cylinder 1 are fixedly connected with support rods 1302. The support rods 1302 are fixedly connected to the lower surface of the thread ring 1301. The thread ring 1301 is penetrated through the middle by the grinding ejector rod 1303. The grinding ejector rod 1303 is threadedly connected with the thread ring 1301. The upper end of the grinding ejector rod 1303 is fixedly connected with the rotating disk 1304.

[0047] According to Figure 1 and Figure 3 As shown, the inner side of the upper bearing cylinder 1 is fixedly connected to the outer side of the upper cylinder wall 8. The upper bearing cylinder 1 and the upper cylinder wall 8 are fixedly connected by screws. The lower end of the protective shell 2 is rotatably connected to a lower rotating shaft 22. The lower end of the lower rotating shaft 22 penetrates through the outer side of a lower bearing cylinder 7. Both sides of the lower bearing cylinder 7 are rotatably connected to a rotating shaft 15. Both ends of the two rotating shafts 15 penetrate through the outer sides of two lower connecting plates 14 respectively. The lower connecting plates 14 are arranged on the outer side of the lower cylinder wall 9. The lower connecting plates 14 and the lower cylinder wall 9 are fixedly connected by screws. The middle of the outer surface of the protective shell 2 is fixedly connected to a lifting lug 5. A rope hole is arranged in the middle of the lifting lug 5. The lifting lug 5 is connected to a rope. The other end of the rope is connected by a crane. Before maintenance, the crane lifts the rope, causing the maintenance device to flip towards the inner side of the medium-speed coal mill, so that the support plate 6 can return to the medium-speed coal mill.

[0048] During actual use, for the maintenance device of a medium-speed coal mill of the present invention, during maintenance, first, the originally horizontally arranged protective shell 2 is rotated vertically with the assistance of a hoist and the lifting lugs 5. During the process of rotating the protective shell 2 vertically, the auxiliary reset wheel 17 on its surface will be rolled and pressed against the grinding rod 1303. Then, after it is completely rotated to the vertical state, the grinding rod 1303 is rotated so that the grinding rod 1303 is inserted into the top end of the protective shell 2. During the process of the auxiliary reset wheel 17 following the protective shell 2 to rotate to the vertical state, the piston 1204 at the lower end of the movable rod 1201 is driven by the sliding side plate 18 on the side of the auxiliary reset wheel 17 to squeeze the airbag 1203. After the airbag 1203 is squeezed, an air flow can be generated in the exhaust pipe 1205, and the two horizontal soot blowing pipes 1206 connected to the front end of the exhaust pipe 1205 blow on the surface of the support plate 6. By adopting this method, it is possible to blow the coal ash on the surface of the support plate 6 when the maintenance device is flipped to the vertical state, preventing the support plate 6 from bringing coal ash into the inner surface of the medium-speed coal mill. When the maintenance device is pulled to the vertical state, at the same time, the auxiliary reset wheel 17 at the upper end position of the protective shell 2 can contact the grinding rod 1303. During the contact process between the two, the auxiliary reset wheel 17 can rotate, enabling the grinding rod 1303 to return to the upper end position of the protective shell 2 more smoothly. In addition, the auxiliary reset wheel 17 can move in the vertical direction and be reset by the damper 19. By adopting this method, there will be no jamming when the grinding roller 10 is reset. In addition, when the support plate 6 enters the coal mill and fits with the grinding roller 10, the grinding roller 10 is directly supported by the support plate 6 below, and the upper part of the grinding roller 10 is pulled by the upper pull rod 3. The shape of the contact part between the support plate 6 and the grinding roller 10 matches that of the grinding roller 10. This method is convenient to operate and solves the defect that it was difficult to install by using bolt connection originally. In addition, during the long-term process of the support plate 6 supporting the grinding roller 10, when cracks may occur due to pressure between the support plate 6 and the protective shell 2, the detection solution in the crack repair box 16 will flow into the crack when the crack occurs and solidify after being heated by the heat of the grinding roller 10 itself, bonding at the gap, generating a temporary and certain degree of rigid support and adhesive connection to reinforce and fill the gap. In addition, during the process of lifting the grinding roller 10 out for maintenance, the operator needs to check the position of the floating ball 23 relative to the scale 21 at intervals, so as to clearly and obviously judge whether there is a gap at the connection of the support plate 6. This structure mainly plays an obvious role in prompting the generation of cracks.

[0049] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A medium-speed coal mill maintenance device, comprising a protective shell (2), a grinding roller (10), a dust cleaning mechanism (12) and an auxiliary positioning mechanism (13), characterized in that: An auxiliary reset wheel (17) is provided at the upper end position of the outer surface of the protective case (2). The auxiliary reset wheel (17) is embedded inside the upper end of the protective case (2), and the upper end of the auxiliary reset wheel (17) is higher than the upper end of the protective case (2). Rotating shafts (15) are fixedly connected to both sides of the auxiliary reset wheel (17). The two rotating shafts (15) are respectively rotatably connected to the inner sides of two sliding side plates (18). Damping devices (19) are fixedly connected to the lower ends of the two sliding side plates (18). The lower ends of the damping devices (19) are fixedly connected to the upper surface of a positioning block (20). The positioning block (20) is fixedly connected to the protective case (2). A dust cleaning mechanism (12) is provided inside the protective case (2). An activity rod (1201) is provided inside the dust cleaning mechanism (12). The upper end of the activity rod (1201) is fixedly connected to the lower surface of the sliding side plate (18). The other end of the activity rod (1201) is fixedly connected to the upper surface of a piston (1204). The piston (1204) is arranged inside an internal cavity (1202). The internal cavity (1202) is arranged inside the protective case (2). An airbag (1203) is arranged at the lower end of the piston (1204). The lower end of the airbag (1203) is fixedly connected to an exhaust pipe (1205). The other end of the exhaust pipe (1205) is fixedly connected to two transverse dust blowing pipes (1206). The two transverse dust blowing pipes (1206) are arranged on the upper and lower sides of the outer surface of a support plate (6). A plurality of dust blowing holes are equidistantly arranged on the outer surface of the transverse dust blowing pipe (1206). Upper pull rods (3) are rotatably connected to both sides of the protective case (2). The inner ends of the upper pull rods (3) are rotatably connected to the inner sides of upper connecting plates (4). The upper connecting plates (4) are arranged outside a lining tile (11). The upper connecting plates (4) and the lining tile (11) are fixedly connected by screws. A grinding roller (10) is rotatably connected to the inner side of the lining tile (11). The lower end of the grinding roller (10) is arranged on the upper surface of the support plate (6). The support plate (6) is fixedly connected to the inner side of the protective case (2). The upper surface of the support plate (6) is of a stepped structure. The shapes of the contact parts between the support plate (6) and the grinding roller (10) match each other; One side of the upper surface of the support plate (6) is provided with a crack repair box (16). The crack repair box (16) is fixedly connected to the protective case (2). Two floating balls (23) are arranged inside the crack repair box (16). A floating plate (24) is fixedly connected between the two floating balls (23). Scale tables (21) are arranged on both sides of the crack repair box (16). A detection solution is arranged inside the crack repair box (16).

2. The overhaul device for a medium-speed coal mill according to claim 1, characterized in that: An auxiliary positioning mechanism (13) is provided at the upper end of the protective case (2). A thread ring (1301), a grinding and turning ejector rod (1303) and a rotating disc (1304) are arranged inside the auxiliary positioning mechanism (13).

3. The overhaul device for a medium-speed coal mill according to claim 2, characterized in that: The lower end of the grinding and turning ejector rod (1303) is arranged on the upper surface of the protective shell (2). An upper bearing cylinder (1) is arranged in the middle of the grinding and turning ejector rod (1303). Four corners of the upper surface of the upper bearing cylinder (1) are fixedly connected with support rods (1302), and the support rods (1302) are fixedly connected to the lower surface of the thread ring (1301).

4. The overhaul device for a medium-speed coal mill according to claim 2, characterized in that: The grinding and turning ejector rod (1303) passes through the middle of the thread ring (1301). The grinding and turning ejector rod (1303) is threadedly connected with the thread ring (1301). The upper end of the grinding and turning ejector rod (1303) is fixedly connected with a rotating disc (1304).

5. The overhaul device for a medium-speed coal mill according to claim 3, characterized in that: The lower end of the protective shell (2) is rotatably connected with a lower rotating shaft (22). The lower end of the lower rotating shaft (22) is externally provided with a lower bearing cylinder (7) in a penetrating manner.

6. The overhaul device for a medium-speed coal mill according to claim 5, characterized in that: Both sides of the lower bearing cylinder (7) are rotatably connected with rotating shafts (15). Two ends of the two rotating shafts (15) respectively penetrate the outer sides of two lower connecting plates (14).

7. The overhaul device for medium-speed coal mill according to claim 6, wherein: The inner side of the upper bearing cylinder (1) is fixedly connected to the outer side of the upper cylinder wall (8). The upper bearing cylinder (1) and the upper cylinder wall (8) are fixedly connected by screws.

8. The overhaul device for a medium-speed coal mill according to claim 7, characterized in that: The lower connecting plate (14) is arranged on the outer side of the lower cylinder wall (9). The lower connecting plate (14) and the lower cylinder wall (9) are fixedly connected by screws.

9. The overhaul device for a medium-speed coal mill according to claim 1, characterized in that: A lifting lug (5) is fixedly connected to the middle of the outer surface of the protective shell (2). A rope hole is arranged in the middle of the lifting lug (5).

10. The overhaul device for a medium-speed coal mill according to claim 8, wherein: The upper cylinder wall (8) and the lower cylinder wall (9) are the cylinder wall structures of a medium-speed coal mill.

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