A coal mill bowl dismounting device and dismounting method

Abstract

The application discloses a coal mill grinding bowl removing device and a removing method. The coal mill grinding bowl removing device is applied to a coal mill. The coal mill comprises a grinding bowl hub and a grinding bowl. The coal mill grinding bowl removing device comprises a grinding bowl pulling assembly, a hydraulic jacking assembly, a cooling assembly and a heating assembly. The grinding bowl pulling assembly is installed on the grinding bowl. The hydraulic jacking assembly is arranged on the grinding bowl hub and is located below the grinding bowl pulling assembly and used for jacking up the grinding bowl pulling assembly. The cooling assembly is installed in the grinding bowl hub and is used for cooling the grinding bowl hub. The heating assembly is used for heating the grinding bowl along the outer circumferential side of the grinding bowl. According to the application, the thermal expansion and cold shrink principle is utilized, a temperature difference is generated between the grinding bowl hub and the grinding bowl in a period of time to form a cooperation gap, the grinding bowl pulling assembly is jacked up by the hydraulic jacking assembly, and the grinding bowl is pulled out, so that the efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mill bowl dismounting, and particularly relates to a coal mill bowl dismounting device and a dismounting method. BACKGROUND

[0002] Due to the fact that the bowl and the bowl hub work in a high-temperature and dusty environment, the connecting parts of the bowl and the bowl hub are prone to rust and bite, which makes it difficult to separate the bowl and the bowl hub.

[0003] At present, in the bowl replacement process, a steel beam is usually welded to form a "whole cross-shaped bowl pulling tool", and the bowl is heated by flame to expand it to increase the gap between the fitting surfaces. However, the bowl heating by flame has a slow transmission speed, and when the bowl reaches the required temperature, the temperature is also transmitted to the bowl hub, so that a large temperature difference between the bowl and the bowl hub cannot be generated, thereby generating a gap, which leads to a very low efficiency of pulling out the large bowl, and the bowl often needs to be cut into two halves. This operation not only causes low work efficiency, but also increases engineering cost. SUMMARY

[0004] The technical problem to be solved by the present application is that the existing bowl replacement steps are difficult to generate a gap between the bowl and the bowl hub, and the replacement efficiency is low.

[0005] In order to solve the above technical problems, the present application provides a coal mill bowl dismounting device applied to a coal mill, wherein the coal mill comprises a bowl hub and a bowl installed on the bowl hub, and the coal mill bowl dismounting device comprises:

[0006] a bowl pulling assembly installed on the bowl;

[0007] a hydraulic jacking assembly arranged on the bowl hub and located below the bowl pulling assembly for jacking up the bowl pulling assembly;

[0008] a cooling assembly installed in the bowl hub, the cooling assembly being used for cooling treatment of the bowl hub; and

[0009] a heating assembly used for heating treatment of the bowl along the outer circumferential side of the bowl.

[0010] In some embodiments, the bowl pulling assembly comprises two staggered supports, both of which are installed on the bowl, one of which is higher than the other and is erected on the other, and the hydraulic jacking assembly abuts against the supports.

[0011] In some embodiments, the support comprises a main beam, a leg and a bottom plate, both ends of the main beam are provided with the leg, and the bottom plate is arranged at the end of the leg away from the main beam, and the hydraulic jacking assembly abuts against the main beam.

[0012] In some embodiments, the main beam is provided with ribs.

[0013] In some embodiments, the hydraulic jack assembly comprises a plurality of hydraulic jacks, which are arranged on the grinding bowl hub and positioned below the corresponding support frame to abut against the support frame.

[0014] In some embodiments, the cooling assembly comprises a central cylinder, a support frame, a bottom cover and a cover, the bottom cover is arranged at one end of the central cylinder away from the support frame, and the bottom cover is arranged on the outer circumferential side of the central cylinder, the support frame is arranged at one end of the central cylinder away from the bottom cover, the support frame is arranged on the grinding bowl hub so that the central cylinder is located in the grinding bowl hub, the inner wall of the grinding bowl hub and the outer wall of the central cylinder jointly define a filling space for filling cooling medium, and the cover is arranged above the filling space.

[0015] In some embodiments, the heating assembly comprises an oxygen-acetylene device for heating the grinding bowl along the outer circumferential side of the grinding bowl.

[0016] The present application also provides a disassembly method using the grinding bowl disassembly device as described above, which comprises the following steps:

[0017] installing a cooling assembly in the grinding bowl hub and a grinding bowl pulling assembly on the grinding bowl;

[0018] arranging a hydraulic jack assembly below the grinding bowl pulling assembly and abutting against the grinding bowl pulling assembly to make the grinding bowl pulling assembly bear uniform force;

[0019] filling the cooling assembly with cooling medium and freezing for 150-200 minutes to reduce the surface temperature of the grinding bowl hub to zero;

[0020] heating the bottom of the grinding bowl along the outer circumferential side of the grinding bowl by using a heating assembly to make the fitting gap between the grinding bowl and the grinding bowl hub larger;

[0021] the hydraulic jack assembly jacks up the grinding bowl pulling assembly to separate the grinding bowl from the grinding bowl hub.

[0022] In some embodiments, installing a hydraulic jack assembly below the grinding bowl pulling assembly and abutting against the grinding bowl pulling assembly to make the grinding bowl pulling assembly bear uniform force comprises:

[0023] pressing the hydraulic jack assembly to 5Mpa to determine whether the grinding bowl pulling assembly bears uniform force;

[0024] If the pull grinding bowl assembly is uniformly stressed, the hydraulic top assembly is pressed to 10Mpa, and whether the pull grinding bowl assembly is deformed is checked;

[0025] If the pull grinding bowl assembly is not deformed, the hydraulic top assembly is pressed to 15Mpa, and whether the pressure of the hydraulic top assembly decreases is observed;

[0026] If the pressure of the hydraulic top assembly does not decrease, the next step is performed.

[0027] In some embodiments, the heating of the bottom of the grinding bowl along the outer circumferential side of the grinding bowl by the heating assembly comprises:

[0028] The outer edge of the grinding bowl is heated towards the center of the grinding bowl, and the grinding bowl is heated to 40-60℃.

[0029] Compared with the prior art, the coal mill grinding bowl dismounting device provided by the embodiment of the present application has the following beneficial effects:

[0030] The pull grinding bowl assembly is installed on the grinding bowl, and the hydraulic top assembly is used to resist the pull grinding bowl assembly, the cooling assembly in the grinding bowl hub is used to cool the grinding bowl hub, and the heating assembly is used to heat the grinding bowl along the outer circumferential side of the grinding bowl; the present embodiment uses the principle of thermal expansion and contraction of an object, simultaneously heats the grinding bowl and freezes the grinding bowl hub, so that a temperature difference is generated between the grinding bowl and the grinding bowl hub within a period of time, a cooperation gap is formed, the hydraulic top assembly is lifted, the pull grinding bowl assembly is lifted, and the grinding bowl is pulled out. Compared with the conventional heating method, the present embodiment can more quickly generate a gap between the grinding bowl and the grinding bowl hub, and the grinding bowl does not need to be cut into two halves, so that the efficiency is improved and the engineering cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a use schematic diagram of the coal mill grinding bowl dismounting device provided by the embodiment of the present application;

[0032] Figure 2 is a structure schematic diagram of the first support provided by the embodiment of the present application;

[0033] Figure 3 is a front view of the first support provided by the embodiment of the present application;

[0034] Figure 4 is a front view of the second support provided by the embodiment of the present application;

[0035] Figure 5 is a structure schematic diagram of the cooling assembly provided by the embodiment of the present application;

[0036] Figure 6 is a top view of the cooling assembly provided by the embodiment of the present application;

[0037] In the figure, 100, coal mill bowl dismounting device; 110, pull bowl assembly; 111, main beam; 112, support foot; 113, bottom plate; 114, extension frame; 115, rib; 120, hydraulic jack assembly; 130, cooling assembly; 131, center cylinder; 132, support frame; 133, bottom cover; 134, cover;

[0038] 200, bowl hub; 201, hollow structure;

[0039] 300, bowl. DETAILED DESCRIPTION

[0040] The specific embodiments of the present application are described in further detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0041] As Figure 1 shown, a coal mill bowl dismounting device 100 of the preferred embodiment of the present application is applied to a coal mill, the coal mill comprising a bowl hub 200 and a bowl 300 installed on the bowl hub 200, the bowl hub 200 having a hollow structure 201, the coal mill bowl dismounting device 100 comprising a pull bowl assembly 110, a hydraulic jack assembly 120, a cooling assembly 130, and a heating assembly; wherein the pull bowl assembly 110 is installed on the bowl 300, and the bottom end of the pull bowl assembly 110 is connected with the bowl 300, the hydraulic jack assembly 120 is arranged on the bowl hub 200, and the hydraulic jack assembly 120 is located below the pull bowl assembly 110 for jacking up the pull bowl assembly 110; the cooling assembly 130 is installed in the hollow structure 201 of the bowl hub 200, and the cooling assembly 130 is used for cooling treatment of the bowl hub 200; the heating assembly is used for heating treatment of the bowl 300 along the outer circumferential side of the bowl 300.

[0042] The pull bowl assembly 110 of the present embodiment is installed on the bowl 300, and is resisted by the hydraulic jack assembly 120, the bowl hub 200 is cooled by the cooling assembly 130 located in the bowl hub 200, and the bowl 300 is heated by the heating assembly along the outer circumferential side of the bowl 300, the principle of thermal expansion and contraction of objects is used to make the two generate a temperature difference within a period of time, form a fitting gap, jack up the hydraulic jack assembly 120, and make the pull bowl assembly 110 jack up, so that the bowl 300 is pulled out. The bowl 300 and the bowl hub 200 can be more quickly made to have a gap, the efficiency of dismounting is improved, and the engineering cost is reduced.

[0043] The device principle is based on the thermal expansion and contraction principle of the object. For the hole shaft matching workpiece with large size, the process of simultaneously increasing the hole diameter of the grinding bowl 300 and reducing the shaft diameter of the grinding bowl hub 200 is adopted in the embodiment, so that the gap between the two is generated faster and the two are easily separated.

[0044] In some embodiments, the pull grinding bowl assembly 110 includes two staggered supports, both of which are mounted on the grinding bowl 300, and the hydraulic top assembly 120 abuts against the supports. The pull grinding bowl assembly 110 in the embodiment is divided into two supports, and the two supports are arranged in a cross shape. The bottom of the support is mounted on the grinding bowl 300 by means of a foundation bolt. The height of one support is higher than that of the other support, so that one support can be erected on the other support, and interference between the two supports during installation can be avoided. The supports in the embodiment are higher than the height of the grinding bowl 300.

[0045] The pull grinding bowl assembly 110 is made by cross-arch split welding and then machined, which is beneficial to ensure the machining and installation precision of the pull grinding bowl assembly 110 and improve the carrying capacity of the pull grinding bowl assembly 110, and facilitates the disassembly and assembly of the pull grinding bowl assembly 110.

[0046] As shown in Figures 2 to 4 In some embodiments, the support includes a main beam 111, a leg 112, and a bottom plate 113. The two ends of the main beam 111 are provided with the leg 112, and the bottom plate 113 is arranged at the end of the leg 112 away from the main beam 111. The hydraulic top assembly 120 abuts against the main beam 111.

[0047] In the embodiment, the main beam 111 is generally selected to be no less than #20 I-beam steel, the leg and the bottom plate 113 are generally selected to be ordinary carbon steel plates with a thickness of no less than 30 mm, and the steel material used by the support is selected to be as large as possible in size within the allowable range. The leg 112 serves as a connecting structure between the main beam 111 and the bottom plate 113 and plays a supporting role. The size of the foundation bolt hole is prepared according to the original fixing bolt hole on the grinding bowl 300. The connection between the main beam 111 and the leg 112 and the connection between the leg 112 and the bottom plate 113 are both welded, and the height of the weld is no less than 12 mm. The surface can be painted with bright paint such as blue paint to prevent corrosion.

[0048] It can be understood that in the embodiment, the higher support is defined as the first support, and the lower support is defined as the second support. The first support is further provided with an extension frame 114 below the main beam 111. The extension frame 114 abuts against the hydraulic top assembly 120, and the bottom of the extension frame 114 is flush with the bottom of the main beam 111 of the second support, so as to balance the height of the abutting positions of the hydraulic top assembly 120 and the first support and the hydraulic top assembly 120 and the second support.

[0049] In some embodiments, the main beam 111 is provided with ribs 115. The ribs 115 are added to the main beam 111 to increase the strength of the main beam 111 and prevent the main beam 111 from being deformed by stress during the jacking process. It can be understood that the lengthening frame 114 at the first support can also be provided with ribs 115 to increase the strength of the lengthening frame 114.

[0050] In some embodiments, the hydraulic jacking assembly 120 includes a plurality of hydraulic jacks. The hydraulic jacks are arranged on the grinding bowl hub 200 and located below the corresponding supports to abut against the supports. In this embodiment, there are four hydraulic jacks. Each support is matched with two hydraulic jacks, and the two hydraulic jacks are respectively installed at the two ends of the main beam 111 of the support to jack up the two ends of the main beam 111, thereby increasing the contact area and playing a balancing role. The height of the support in this embodiment is determined according to the height of the hydraulic jacks. Four 200T manual hydraulic jacks are selected as the hydraulic jacks, mainly to increase the contact area between the hydraulic jacks and the workpiece, so that the entire device is more stable during the jacking process.

[0051] Referring to Figure 5 and Figure 6 In some embodiments, the cooling assembly 130 includes a central cylinder portion 131, a support frame 132, a bottom cover 133, and a cover 134. The outer peripheral side of the central cylinder portion 131 is provided with the bottom cover 133 and the cover 134. The bottom cover 133 is arranged at the end of the central cylinder portion 131 away from the support, and the bottom cover 133 surrounds the outer peripheral side of the central cylinder portion 131. When the cooling assembly 130 is installed in the grinding bowl hub 200, the bottom cover 133, the inner wall of the grinding bowl hub 200, and the outer wall of the central cylinder portion 131 jointly define a filling space, the cooling medium is filled in the filling space, and the cover 134 is covered on the filling space. Preferably, the cooling medium in this embodiment is dry ice. The use of dry ice freezing can reduce the temperature of the grinding bowl hub 200 to zero below, greatly reducing the temperature that the grinding bowl 300 needs to be heated. A temperature of 60°C can effectively produce a large temperature difference, thereby reducing the operation risk and equipment damage risk of the operator.

[0052] In this embodiment, the cooling assembly 130 is installed in the hollow structure 201 of the grinding bowl hub 200, thereby creating the condition of a frozen shaft. It can be understood that the shaft in this embodiment is formed by the annular shaft space jointly defined by the bottom cover 133, the cover 134, the inner wall of the hollow structure 201 of the grinding bowl hub 200, and the outer wall of the central cylinder portion 131, and the cooling medium is filled in the shaft to perform the cooling treatment on the grinding bowl hub 200.

[0053] It should be noted that the size of the cooling assembly 130 is customized according to the size of the grinding bowl hub 200, the shaft needs to contain the matching height between the grinding bowl 300 and the grinding bowl hub 200, and the volume of the filling space for placing dry ice is not less than 0.2m³. Understandably, the height of the central cylinder part 131 in the embodiment can be determined according to the matching height between the grinding bowl 300 and the grinding bowl hub 200 when it is made; the height of the filling space is adjusted to reduce the amount of dry ice placed to prevent the risk of freeze cracking during the shaft freezing process. In addition, the height of the filling space can also be adjusted by the bottom cover 133, that is, the bottom cover 133 is slidably connected to the central cylinder part 131, when the height of the filling space needs to be adjusted, the bottom cover 133 is slid along the height direction of the central cylinder part 131, that is, the height of the filling space is adjusted. The cooling assembly 130 in the embodiment is used to cool the grinding bowl hub 200, so that there is a temperature difference between the grinding bowl hub 200 and the grinding bowl, and a matching gap is generated to lift the grinding bowl 300 by the hydraulic top.

[0054] The cover 134 in the embodiment is composed of four cover plates, and the four cover plates are arranged at intervals around the axis of the central cylinder part 131; there is a gap between the four cover plates so as not to interfere with the support frame 132 when the cover is placed on the filling space. Understandably, handles are provided on the four cover plates to allow workers to cover them on the filling space, and the handle can also be used to bind the cover plates together to prevent movement. In some embodiments, the cover 134 can also be composed of 2, 3 or more cover plates, which are not particularly limited in number as long as they can be covered on the filling space. In addition, in some embodiments, the cover plate can also be replaced by fireproof cloth, that is, the fireproof cloth directly covers the cooling medium.

[0055] The cover 134 in the embodiment is preferably detachably mounted on the central cylinder part 131, and the cooperation between the cover 134 and the central cylinder part 131 can be achieved by cooperation structure, or the installation of the cover 134 can be achieved by limiting between the outer wall of the central cylinder part 131 and the inner wall of the grinding bowl hub 200, which is not particularly limited in cooperation manner.

[0056] In order to facilitate the installation of the central cylinder part 131, the support frame 132 is arranged at one end of the central cylinder part 131 away from the bottom cover 133, and the support frame 132 is connected with the grinding bowl hub 200; the support frame 132 in the embodiment is in a cross-shaped structure, and the length of the support frame 132 is greater than the width of the hollow structure 201 of the grinding bowl hub 200, so as to install the support frame 132 on the grinding bowl hub 200, fix the filling space in the corresponding position of the grinding bowl hub 200, and realize the cooling treatment of the grinding bowl hub 200.

[0057] The central cylinder part 131 in the embodiment can be made of a common steel plate with a thickness of 8 mm, or can be formed by coiling an iron plate, and the support frame 132 can be made of an angle iron with a size of 50 mm*50 mm; the bottom cover 133 and the cover plate can also be made of a common steel plate with a thickness of 8 mm.

[0058] In some embodiments, the heating assembly comprises an oxygen-acetylene device for heating the grinding bowl 300 along the outer peripheral side of the grinding bowl 300. The oxygen-acetylene device is used for flame heating, and the flame with a certain pressure is used to heat the grinding bowl 300, which is flexible in operation, fast in heating speed, safe and reliable. The oxygen-acetylene device needs to use an oxygen cylinder, an acetylene cylinder, an oxygen hose, an acetylene hose, and a one-meter long baking handle. The oxygen hose is connected with the oxygen cylinder, the acetylene hose is connected with the acetylene cylinder, and the baking handle is ignited by the oxygen cylinder and the acetylene cylinder to heat the grinding bowl 300. The parameters during use are generally controlled as follows: the full-bottle pressure of oxygen is 10-15 Mpa, the outlet pressure of oxygen is 1.5-2.5 Mpa, the full-bottle pressure of acetylene is 1-1.5 Mpa, and the outlet pressure of acetylene is 0.05-0.15 Mpa. Four sets of oxygen-acetylene devices are needed, and the gas cylinders are used in strict accordance with the relevant safety management regulations.

[0059] The application further provides a dismounting method, which applies the grinding bowl dismounting device 100 and comprises the following steps:

[0060] S110, installing the cooling assembly 130 in the grinding bowl hub 200 and installing the grinding bowl pulling assembly 110 on the grinding bowl 300;

[0061] The cooling assembly 130 is installed in the hollow part of the grinding bowl hub 200, and the support frame 132 is erected on the grinding bowl hub 200 or fixed on the grinding bowl hub 200 by the locking member, so that the central cylinder part 131 is located in the hollow part and is placed as centrally as possible.

[0062] The bracket below the grinding bowl pulling assembly 110 is installed at the inner diameter of the grinding bowl 300, the bracket above the bracket is installed at 90° with the bracket below by screwing the bolts, the bracket above is installed at 90° with the bracket below by screwing the bolts, and the bottom plate 113 of the bracket is ensured to be attached to the grinding bowl 300.

[0063] S120, arranging the hydraulic jack assembly 120 below the grinding bowl pulling assembly 110 and abutting against the grinding bowl pulling assembly 110, so that the grinding bowl pulling assembly 110 is uniformly stressed;

[0064] Four hydraulic jacks are respectively arranged near the four supporting legs 112 of the grinding bowl pulling assembly 110, and the four hydraulic jacks are simultaneously pre-tightened, so that the two brackets in the shape of a cross are uniformly stressed.

[0065] S130, fill the cooling assembly 130 with cooling medium, and freeze 150-200 minutes to reduce the surface temperature of the grinding bowl hub 200 to zero;

[0066] Fill the filling space with dry ice, and cover it with the cover 134 to form a frozen shaft to cool the grinding bowl hub 200. The freezing process takes about 150-200 minutes. Use an industrial temperature gun to monitor the surface temperature of the grinding bowl hub 200, so that the surface temperature is between minus 10℃ and minus 15℃. The transition section of the grinding bowl 300 and the grinding bowl hub 200 basically has a temperature difference of 2-4℃. In some embodiments, the cover 134 can also be replaced with fireproof cloth.

[0067] S140, use the heating assembly to heat the bottom of the grinding bowl 300 along the outer periphery of the grinding bowl 300, so that the fit clearance between the grinding bowl 300 and the grinding bowl hub 200 becomes larger;

[0068] Enable the heating assembly, and distribute four ignited ovens evenly around the grinding bowl 300, and heat the bottom of the grinding bowl 300 along the outer periphery of the grinding bowl 300. Since the dry ice in the grinding bowl hub 200 is still in effect, the temperature of the grinding bowl hub 200 does not rise significantly, and a larger temperature difference between the grinding bowl 300 and the grinding bowl hub 200 will cause the fit clearance between the two to become larger.

[0069] S150, the hydraulic jack assembly 120 lifts the grinding bowl assembly 110, so that the grinding bowl 300 and the grinding bowl hub 200 are separated.

[0070] Because the grinding bowl 300 and the grinding bowl hub 200 have a separation pressure, when the gap between them becomes larger, they will obviously separate. At this time, the four hydraulic jacks are used to lift the grinding bowl assembly 110, until the grinding bowl 300 and the grinding bowl hub 200 are completely separated.

[0071] In some embodiments, the hydraulic jack assembly 120 is installed below the grinding bowl assembly 110 and abuts against the grinding bowl assembly 110 to make the grinding bowl assembly 110 bear uniform force, including:

[0072] S121, press the hydraulic jack assembly 120 to 5Mpa, and judge whether the grinding bowl assembly 110 bears uniform force;

[0073] Press the hydraulic jack to 5Mpa respectively, and judge whether the tool bears uniform force by measuring the lifting height.

[0074] S122, if the grinding bowl assembly 110 bears uniform force, press the hydraulic jack assembly 120 to 10Mpa, and check whether the grinding bowl assembly 110 is deformed;

[0075] S123, if the grinding bowl assembly 110 is not deformed, the hydraulic pressing assembly 120 is pressed to 15Mpa, and the pressure of the hydraulic pressing assembly 120 is observed to see if it drops;

[0076] After confirming that there is no abnormality, continue to pressurize to 15Mpa, and observe the pressure for five minutes to see if the pressure of the hydraulic pressing assembly 120 drops.

[0077] S124, if the pressure of the hydraulic pressing assembly 120 does not drop, proceed to the next step.

[0078] In some embodiments, heating the bottom of the grinding bowl 300 along the outer peripheral side of the grinding bowl 300 with the heating assembly includes:

[0079] S141, heating from the outer edge of the grinding bowl 300 to the center of the grinding bowl 300, and heating the grinding bowl 300 to 40-60℃. The heating temperature can be 45℃, 48℃, 49℃, 50℃, 51℃, 52℃ or 55℃, and is generally heated to close to 50℃.

[0080] In summary, the embodiment of the present application provides a coal mill grinding bowl dismounting device 100 and a dismounting method, which has high safety, wide application range, flexible operation, and the effect of protecting the grinding bowl 300. The grinding bowl hub 200 is first cooled to a set temperature below zero, and then heated from the outer edge of the grinding bowl 300 to the center, so that the grinding bowl 300 and the grinding bowl hub 200 have a large temperature difference at a lower temperature, solving the problem that single heating of the grinding bowl 300 causes the grinding bowl 300 to heat to the grinding bowl hub 200, resulting in an insignificant temperature difference between the two. The coal mill grinding bowl dismounting device 100 uses a split cross frame tool instead of a whole cross frame tool, which is installed on two tool frames in an up-down and 90° manner, has high recognition, high manufacturing precision, is easy to install and repair, has strong anti-deformation ability, and is matched with ice tools. The hollow shape of the grinding bowl hub 200 is ingeniously used to freely control the height of the frozen shaft section, reducing the amount of dry ice used, protecting the shaft from damage due to overcooling, and reducing the amount of dry ice input.

[0081] The above only describes the preferred embodiments of the present application, and it should be noted that for ordinary skilled persons in the technical field, several improvements and replacements can be made without departing from the technical principles of the present application, and these improvements and replacements should be considered as the protection scope of the present application.

Claims

1. A grinding bowl removal device for a coal mill, applied to a coal mill, the coal mill comprising a grinding bowl hub and a grinding bowl mounted on the grinding bowl hub, characterized in that, The coal mill bowl removal device includes: The grinding bowl assembly includes two staggered brackets, both of which are mounted on the grinding bowl. One bracket is higher than the other and is mounted on the other bracket. A hydraulic jack assembly abuts against the bracket. A hydraulic jack assembly is disposed on the grinding bowl hub, and the hydraulic jack assembly is located below the grinding bowl removal assembly for lifting the grinding bowl removal assembly; A cooling assembly includes a central cylindrical section, a support frame, a bottom cover, and a cover. The bottom cover is slidably connected to the end of the central cylindrical section away from the support frame and surrounds the outer periphery of the central cylindrical section. The support frame is located at the end of the central cylindrical section opposite to the bottom cover and is mounted on a grinding bowl hub, such that the central cylindrical section is located within the grinding bowl hub. The bottom cover, the inner wall of the grinding bowl hub, and the outer wall of the central cylindrical section together define a filling space for filling a cooling medium. The cover is positioned over the filling space. The cooling assembly is used to cool the grinding bowl hub. A heating assembly for heating the grinding bowl along its outer periphery.

2. The coal mill bowl removal device according to claim 1, characterized in that, The support includes a main beam, legs, and a base plate. The legs are provided at both ends of the main beam, and the base plate is located at the end of the legs away from the main beam. The hydraulic jacking assembly abuts against the main beam.

3. The coal mill grinding bowl removal device according to claim 2, characterized in that, The main beam is equipped with ribs.

4. The coal mill grinding bowl removal device according to claim 1, characterized in that, The hydraulic jack assembly includes multiple hydraulic jacks, which are disposed on the grinding bowl hub and located below the corresponding bracket to abut against the bracket.

5. The coal mill bowl removal device according to claim 1, characterized in that, The heating assembly includes an oxyacetylene device for heating the grinding bowl along its outer periphery.

6. A disassembly method, using the coal mill grinding bowl disassembly device as described in any one of claims 1-5, characterized in that, The disassembly method includes the following steps: A cooling component is installed inside the grinding bowl hub, and a grinding bowl removal component is installed on the grinding bowl. A hydraulic jack assembly is provided below the grinding bowl assembly and abuts against the grinding bowl assembly to ensure that the grinding bowl assembly is subjected to uniform force. The cooling component is filled with a cooling medium and frozen for 150-200 minutes to reduce the surface temperature of the grinding bowl hub to below zero. The bottom of the grinding bowl is heated along the outer periphery of the grinding bowl using a heating component, which increases the mating clearance between the grinding bowl and the grinding bowl hub. The hydraulic jacking assembly lifts the grinding bowl assembly, causing the grinding bowl to separate from the grinding bowl hub.

7. The disassembly method according to claim 6, characterized in that, Installing a hydraulic jack assembly below the grinding bowl assembly and abutting against the grinding bowl assembly to ensure that the grinding bowl assembly is subjected to uniform force includes: Press the hydraulic jack assembly to 5 MPa and determine whether the grinding bowl assembly is subjected to uniform force. If the grinding bowl assembly is subjected to uniform force, press the hydraulic jack assembly to 10 MPa and check whether the grinding bowl assembly is deformed. If the grinding bowl assembly is not deformed, press the hydraulic jack assembly to 15 MPa, hold the pressure and observe whether the pressure of the hydraulic jack assembly drops; If the pressure of the hydraulic jack assembly does not decrease, proceed to the next step.

8. The disassembly method according to claim 6, characterized in that, The heating of the bottom of the grinding bowl along its outer periphery using a heating assembly includes: Heating is performed from the outer edge of the grinding bowl towards its center, and the grinding bowl is heated to 40-60°C.

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