Blast furnace main exhaust fan impeller replacing device

Abstract

The utility model provides a blast furnace main exhaust fan impeller replacing device, and relates to the technical field of metallurgy, the blast furnace main exhaust fan impeller replacing device comprises a placing platform, a special impeller dismounting device is arranged on the placing platform, the special impeller dismounting device comprises H-shaped steel vertically placed at one end of the placing platform, and a transverse groove is formed in one side of a cross beam of the H-shaped steel; a supporting frame is arranged on the other side of the containing platform, and a hoisting device is connected to the upper portion of the supporting frame. According to the utility model, the problem that the impeller of the powder exhaust fan is difficult to disassemble, assemble and hoist can be quickly solved, and the maintenance labor intensity is reduced, the unit downtime is reduced and the pulverized coal yield is improved while the equipment facility function and the installation precision are guaranteed; meanwhile, the device is convenient to operate, rapid in hoisting, economical, practical, safe and reliable, and has great economic benefits and good popularization value.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgy, in particular to a device for replacing an impeller of a main exhaust fan of a blast furnace. Background Art

[0002] Xichang Steel and Vanadium Iron and Steel Plant has a total of three coal mills, each of which is equipped with a dust exhaust fan, which is mainly composed of a motor, a bearing box, an impeller, and a fan casing. The dust exhaust fan generates suction to transport the ground coal in the mill to the storage box.

[0003] However, due to the structure of the fan, once the bearing is damaged, it needs to be dismantled as a whole and then the impeller can be removed before the bearing can be replaced. However, the impeller has a diameter of 2m, and there are no corresponding tools for removing the impeller. The impeller can only be removed by installing the pull rods through the two through holes on the impeller. Since the impeller and the shaft are interference fit, the pull rods are often damaged during the removal process. The operator needs to repair the pull rods back and forth and heat the impeller before the impeller can be removed. When inspecting and replacing the fan impeller and bearings, the disassembly is difficult, and each time a crane or forklift is used to lift the impeller and shaft, the fan is difficult to fix, which greatly increases the difficulty of the operation, wastes the operator's working time, increases the labor intensity, and is prone to maintenance safety accidents, resulting in low maintenance efficiency.

[0004] In summary, the research, design and production of a set of tooling devices for rapid disassembly and assembly of fan impellers have solved the technical problem of rapid disassembly and assembly of fan impellers. Utility Model Content

[0005] The utility model provides a device for replacing the impeller of a main exhaust fan of a blast furnace, which solves the problem that it is difficult to dismantle the existing pulverized dust exhaust fan.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A device for replacing an impeller of a main exhaust fan of a blast furnace comprises a placement platform, on which a special device for removing the impeller is arranged, the special device for removing the impeller comprises an H-shaped steel vertically placed at one end of the placement platform, one side of the crossbeam of the H-shaped steel is provided with a transverse groove; a support frame is arranged on the other side of the placement platform, and a lifting device is connected to the top of the support frame.

[0008] Furthermore, the placement platform includes a U-shaped bottom plate with an open upper end, and a card slot is provided in the middle of the U-shaped bottom plate.

[0009] Furthermore, a hydraulic jack is placed in the transverse groove.

[0010] Furthermore, the other side of the crossbeam of the H-shaped steel is connected to one end of a reinforcement plate, and the other end of the reinforcement plate is connected to the upper surface of the U-shaped bottom plate.

[0011] Furthermore, a support frame is arranged at the other end of the placement platform, and two U-shaped rounded steel pipes are respectively connected to two horizontal arms of the support frame.

[0012] Furthermore, the number of the hoisting devices is two, and the hoisting devices include cylindrical steel, and a movable hanging point is arranged on the lower surface of the cylindrical steel.

[0013] Furthermore, the two lifting devices are respectively arranged perpendicularly to the two U-shaped rounded steel pipes.

[0014] The beneficial effects of the utility model are:

[0015] The utility model can quickly solve the problem of difficult removal and installation of the impeller of the pulverized coal exhaust fan, while ensuring the function and installation accuracy of the equipment and facilities, reducing the maintenance labor intensity, reducing the unit downtime, and increasing the pulverized coal output.

[0016] The utility model is convenient to operate, quick to hoist, economical, practical, safe and reliable, and has great economic benefits and good promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 Schematic diagram of the original removal method of the main exhaust fan.

[0019] Figure 2 It is a schematic diagram of the structure of the utility model.

[0020] Figure 3 Schematic diagram of the main exhaust fan impeller disassembly.

[0021] Description of Figure Numbers:

[0022] 1. Placement platform; 2. Special dismantling device; 3. Lifting device; 4. H-shaped steel; 5. Horizontal groove; 6. Support frame; 7. Reinforcement plate; 8. U-shaped rounded steel pipe; 9. Movable lifting point; 10. U-shaped bottom plate; 11. Slot; 12. Cylindrical steel. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0027] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0030] The utility model provides a technical solution: a blast furnace main exhaust fan impeller replacement device, such as Figure 1-3 As shown, the main contents include:

[0031] 1. Aiming at the problem of difficulty in placing the fan impeller during replacement, a special placement platform 1 is designed. The fan main shaft and impeller will not roll after being placed on the platform, making maintenance convenient.

[0032] 2. A special device 2 for impeller removal is designed and manufactured, which can realize safe and efficient impeller removal during the impeller removal process. After the impeller is removed, the main shaft and impeller are well positioned without rolling or swinging.

[0033] 3. A lifting device is designed to effectively solve the problem of difficult lifting of the spindle and bearings during the replacement of the spindle bearings.

[0034] The above three designs are combined to realize continuous action, that is, the technical problem of rapid disassembly and assembly of the fan impeller is realized.

[0035] Specifically, it includes a placement platform 1, which includes a U-shaped bottom plate 10 with an opening at the upper end, and a slot 11 is provided in the middle of the U-shaped bottom plate 10; the placement platform 1 is provided with a special removal device 2, which includes an H-shaped steel 4 vertically placed at one end of the placement platform 1, and a transverse groove 5 is provided on one side of the crossbeam of the H-shaped steel 4, and a hydraulic jack is placed in the transverse groove 5, and the other side of the crossbeam of the H-shaped steel 4 is connected to one end of a reinforcing plate 7, and the other end of the reinforcing plate 7 is connected to the upper surface of the U-shaped bottom plate 10. A support frame 6 is provided on the other side of the placement platform 1, and two U-shaped rounded steel pipes 8 are connected to the two cross arms of the support frame 6 respectively. Two hoisting devices 3 are connected to the top of the support frame 6, and the two hoisting devices 3 are respectively arranged vertically with the two U-shaped rounded steel pipes 8.

[0036] The working process of the device is:

[0037] First, the main shaft and impeller of the main exhaust fan are removed from the fan housing and placed on the device using a crane;

[0038] Second, remove the fan impeller locking nut and use a hydraulic jack to push the main shaft out of the impeller;

[0039] Third, use the hydraulic jack and the movable lifting point 9 above the device to replace the main shaft coupling and bearings.

[0040] Economic and social benefits:

[0041] a. Maintenance labor efficiency

[0042] The old replacement method was used to overhaul the impeller of the coal-injected main exhaust fan. It took 20 people 14 hours to complete the overhaul of each fan impeller. After the improvement, the disassembly and assembly of the impeller, bearing and coupling saved labor and time, and it only took 12 people 8 hours to complete. Calculated at a labor price of 59.88 yuan per hour, the three main exhaust fans can be overhauled once a year throughout the year, which can save labor costs:

[0043] According to the benefit calculation formula of Panzhihua Iron and Steel: Maintenance benefit = (cost before maintenance - cost after maintenance) × contribution coefficient - development cost, the contribution coefficient is 0.9, then the labor cost that can be saved each year after the improvement is:

[0044] S 人工 =(20*14-12*8)*3*59.88*0.9-1000=28,700 yuan

[0045] b. Production efficiency

[0046] Calculated based on the capacity of each pulverizing system equipment ≥ 35t / h, the cost of each ton of coke is 2,200 yuan, and the cost of each ton of coal is 1,570 yuan. After the three main exhaust fans are overhauled using the new operation method, the time saved each year can be (14-8)*3=18 hours, which can create production benefits:

[0047] Formula: S 生产 =Y1i*Ti*Ai*Gi*Ci-Bi

[0048] S production-process technology innovation benefits, ten thousand yuan;

[0049] Y1i-reduction of downtime throughout the year after improvement, h;

[0050] Ti- coal powder production per unit downtime, t / h;

[0051] Ai-unit benefit of coal powder, (2200-1570) = 630 yuan / ton;

[0052] Gi-process technology contribution coefficient, 0.7;

[0053] Ci-effective operation rate 90%;

[0054] Bi-R&D investment, 10,000 yuan.

[0055] S 生产 =18*35*630*0.7*0.9-0.1=249,000 yuan''

[0056] S=2.87+24.9=277,000 yuan.

[0057] 2. Social Benefits

[0058] Through the coal injection main exhaust fan impeller disassembly and assembly operation, firstly, the previous dangerous operation methods are eliminated, the personal safety of employees is guaranteed, and the safety risks of operators are reduced. Secondly, the application of this replacement device operation reduces the workload of maintenance personnel, greatly reduces the labor intensity of employees, and ensures the mental state of operators. Thirdly, it reduces the equipment downtime and provides a strong guarantee for the smooth operation of the blast furnace.

[0059] The replacement device is suitable for disassembly and assembly of relatively large fan impellers and can be extended to similar fan impeller replacement fields.

[0060] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A blast furnace main exhaust fan impeller replacement device, characterized in that: The invention comprises a placement platform (1), on which a special removal device (2) is arranged, and the special removal device (2) comprises an H-shaped steel (4) vertically placed at one end of the placement platform (1), and a transverse groove (5) is arranged on one side of the crossbeam of the H-shaped steel (4); a support frame (6) is arranged on the other side of the placement platform (1), and a lifting device (3) is connected to the top of the support frame (6).

2. The blast furnace main exhaust fan impeller replacement device according to claim 1, characterized in that: The placement platform (1) comprises a U-shaped bottom plate (10) with an open upper end, and a card slot (11) is provided in the middle of the U-shaped bottom plate (10).

3. The blast furnace main exhaust fan impeller replacement device according to claim 1, characterized in that: A hydraulic jack is placed in the transverse groove (5).

4. The blast furnace main exhaust fan impeller replacement device according to claim 1, characterized in that: The other side of the crossbeam of the H-shaped steel (4) is connected to one end of the reinforcing plate (7), and the other end of the reinforcing plate (7) is connected to the upper surface of the U-shaped bottom plate (10).

5. The blast furnace main exhaust fan impeller replacement device according to claim 1, characterized in that: A support frame (6) is arranged at the other end of the placement platform (1), and two U-shaped rounded steel pipes (8) are respectively connected to two horizontal arms of the support frame (6).

6. The blast furnace main exhaust fan impeller replacement device according to claim 1, characterized in that: The number of the hoisting devices (3) is two, and the hoisting devices (3) comprise a cylindrical steel (12), and a movable hoisting point (9) is arranged on the lower surface of the cylindrical steel (12).

7. The blast furnace main exhaust fan impeller replacement device according to claim 5, characterized in that: The two lifting devices (3) are respectively arranged vertically on the two U-shaped rounded steel pipes (8).

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