Leaking stoppage device for powder pipe of coal mill in power plant

Abstract

The utility model discloses a power plant coal mill powder pipe leaking stoppage device which comprises a hoop body, a connecting piece is arranged at one end of the hoop body, a first connecting base and a second connecting base are fixed to the two sides of the hoop body respectively, and a locking assembly used for locking the hoop body is arranged between the first connecting base and the second connecting base. An inner liner is fixed on the inner side of the hoop body, the hoop body wraps the outer side of the powder pipe, the hoop body is connected with the powder pipe through the inner liner, a reinforcing strip is further arranged on the outer side of the hoop body, and the two ends of the reinforcing strip are fixedly connected to the first connecting base and the second connecting base respectively. According to the leaking stoppage device, the inner liner is arranged in the hoop body, and the leaking point on the powder pipe can be better plugged by the inner liner through extrusion of the hoop body, so that a coal mill does not need to be shut down for fire welding, the plugging work of the leaking point on the powder pipe can be safely and efficiently completed, and the maintenance efficiency of the powder pipe is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal grinding and pulverizing systems in power plants, in particular to a leakage plugging device for a coal grinding pipe of a power plant. Background Art

[0002] Large boiler coal mill equipment has been in use for too long, and the internal structure of the equipment has gradually aged. The working environment of the coal mill powder pipe is harsh, and corrosion will inevitably occur inside the pipe. Long-term corrosion will cause serious wear inside the pipe, causing air leakage or leakage. In addition, internal structural defects of the pipe are also one of the reasons for the leakage of the coal mill powder pipe. The quality of the pipe connection is poor, and the curvature radius of the pipe is too small, which is prone to fatigue cracking. At present, most of the powder pipe leakage points of the boiler pulverizing system exist in the powder pipe after the coal powder distributor and the wind speed measuring device.

[0003] Coal mill powder pipe leakage is a very common abnormality in thermal power plants. However, powder pipe leakage poses many hazards, such as pollution of equipment and the environment, the risk of fire when accumulated powder is close to high-temperature heat sources, the risk of fire caused by the explosion of large amounts of accumulated powder, and the impact on the economic efficiency of the boiler. Therefore, when a leak occurs, the leak point must be sealed in time to avoid affecting the safe, economical, and environmentally friendly operation of the boiler.

[0004] The existing powder hose plugging technology generally uses glass water plus asbestos rope to plug the leak or uses electric welding to stick a piece of iron plate to plug the powder hose leakage point. The plugging method of using glass water plus asbestos rope can easily cause the powder hose below to stick to the coal powder, which is difficult and risky to clean, and is prone to fire or powder hose blockage. Hot-fire electric welding is prone to fire and other risks, and requires the mill to be stopped, resulting in the coal mill being unable to be used for standby. Therefore, we have proposed a power plant coal mill powder hose plugging device to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a power plant coal mill powder pipe plugging device to solve the problem proposed in the above background technology that the current plugging method using glass water plus asbestos rope is very likely to cause the lower powder pipe to stick to the coal powder, which is difficult and risky to clean, and is prone to fire or cause the powder pipe to be blocked, while hot electric welding is prone to fire and other risks, and the mill needs to be stopped, resulting in the coal mill being unable to be used for standby.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a power plant coal mill powder pipe plugging device, comprising a hoop body, a connecting piece being provided at one end of the hoop body, a first connecting seat and a second connecting seat being fixed on both sides of the hoop body, a locking assembly for locking the hoop body being provided between the first connecting seat and the second connecting seat, an inner liner being fixed on the inner side of the hoop body, the hoop body being wrapped around the outer side of the powder pipe, and the hoop body being connected to the powder pipe through the inner liner, a reinforcing strip being further provided on the outer side of the hoop body, and the two ends of the reinforcing strip being fixedly connected to the first connecting seat and the second connecting seat respectively.

[0007] Preferably, the hoop body and the connecting piece are integrated, and the thickness of the connecting piece gradually becomes thinner as it moves away from the hoop body.

[0008] Preferably, the first connecting seat and the second connecting seat are also integrated with the hoop body, and the thickness of the connection between the first connecting seat and the second connecting seat and the hoop body is thicker than the thickness of the hoop body itself.

[0009] Preferably, the hoop body, the connecting piece, the first connecting seat and the second connecting seat are all made of stainless steel.

[0010] Preferably, the locking assembly includes a first connecting rod, a second connecting rod, a locking bolt and a limit nut. The first connecting rod is movably mounted on the first connecting seat, and the second connecting rod is movably mounted on the second connecting seat. Through holes are provided on the first connecting rod and the second connecting rod, and the locking bolt passes through the through holes on the first connecting rod and the second connecting rod and is connected to the limit nut.

[0011] Preferably, the side of the limiting nut is a concave arc surface structure, and the concave surface on the limiting nut is fitted and connected to the outer side surfaces of the first connecting rod and the second connecting rod.

[0012] Preferably, the inner liner is made of rubber, and the middle position of the inner liner is fixedly connected to the inner side of the hoop body, and the two ends of the inner liner are in contact with the inner side of the hoop body.

[0013] Preferably, the reinforcement strip is a steel wire rope, and both ends of the reinforcement strip are welded to the first connecting seat and the second connecting seat, and the welding position is opposite to the middle position of the locking assembly.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] (1) The leak-proof device is provided with an inner liner in the hoop body. By squeezing the hoop body, the inner liner can better seal the leak point on the powder hose. In this way, it is not necessary to shut down the coal mill for hot-fire welding, and the leak point on the powder hose can be sealed safely and efficiently, effectively improving the maintenance efficiency of the powder hose.

[0016] (2) The leak-proof device is provided with a connecting piece on the hoop body, which enables the hoop body to be connected to the outside of the powder hose to form a circle, ensuring that the inner liner is squeezed more comprehensively. At the same time, the leak-proof device can be applied to powder hoses of different sizes, thereby improving the use efficiency of the leak-proof device;

[0017] (3) The leak plugging device is provided with a reinforcing strip on the outside of the hoop body, and the position of the reinforcing strip is opposite to the locking assembly, so that the reinforcing strip can be pulled by the locking assembly to further perform a secondary extrusion on the hoop body, thereby strengthening the working state of the hoop body and ensuring the stability of the leak point sealing state on the powder hose. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

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

[0020] Figure 3 This is a schematic diagram of the reinforcing strip structure of the utility model;

[0021] Figure 4 This is a schematic cross-sectional view of the first connecting seat and the second connecting seat of the utility model;

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the utility model.

[0023] In the figure: 1. hoop body; 2. connecting piece; 3. inner liner; 4. powder hose; 5. first connecting seat; 6. first connecting rod; 7. second connecting seat; 8. second connecting rod; 9. locking bolt; 10. limit nut; 11. reinforcement strip; 12. through hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1-4 The utility model provides a technical solution: a power plant coal mill powder pipe plugging device, comprising a hoop body 1, a connecting piece 2 is provided at one end of the hoop body 1, and a first connecting seat 5 and a second connecting seat 7 are respectively fixed on both sides of the hoop body 1.

[0026] Furthermore, the hoop body 1 and the connecting piece 2 are integrated to ensure the stable working state of the connecting piece 2, and the thickness of the connecting piece 2 gradually becomes thinner as it moves away from the hoop body 1, so that the connecting piece 2 and the other end of the hoop body 1 can be superimposed on each other more smoothly, thereby completing the extrusion work of the inner liner 3 more comprehensively and ensuring that the inner liner 3 is more stable in sealing the leakage point of the powder tube 4.

[0027] Furthermore, the first connecting seat 5 and the second connecting seat 7 are also integrated with the hoop body 1, so that the first connecting seat 5 and the second connecting seat 7 can control the operation of the hoop body 1 more stably, and the thickness of the connection between the first connecting seat 5 and the second connecting seat 7 and the hoop body 1 is thicker than the thickness of the hoop body 1 itself, ensuring the force strength of the first connecting seat 5 and the second connecting seat 7.

[0028] Furthermore, the hoop body 1, the connecting piece 2, the first connecting seat 5 and the second connecting seat 7 are all made of stainless steel, ensuring a long service life of the leak-proof device.

[0029] A locking assembly for locking the hoop body 1 is provided between the first connecting seat 5 and the second connecting seat 7. The locking assembly includes a first connecting rod 6, a second connecting rod 8, a locking bolt 9 and a limit nut 10. The first connecting rod 6 is movably mounted on the first connecting seat 5, and the second connecting rod 8 is movably mounted on the second connecting seat 7. The positions of the first connecting rod 6 and the second connecting rod 8 can be adjusted, so that the leak-proof device is suitable for powder tubes 4 of different sizes. A through hole 12 is provided on the first connecting rod 6 and the second connecting rod 8. The locking bolt 9 passes through the through holes 12 on the first connecting rod 6 and the second connecting rod 8 and is connected with the limit nut 10, which facilitates the fixation of the hoop body 1 in the working state and improves the utilization efficiency of the leak-proof device.

[0030] Furthermore, the side of the limit nut 10 is a concave arc surface structure, and the concave surface on the limit nut 10 is fitly connected to the outer side surfaces of the first connecting rod 6 and the second connecting rod 8. When the limit nut 10 is fitly connected to the first connecting rod 6 or the second connecting rod 8, the limit nut 10 itself can be limited from rotating, which makes it convenient to control the locking bolt 9 to tighten the hoop body 1.

[0031] An inner liner 3 is fixed to the inner side of the hoop body 1 . The hoop body 1 is wrapped around the outer side of the powder hose 4 , and the hoop body 1 is connected to the powder hose 4 through the inner liner 3 .

[0032] Furthermore, the inner liner 3 is made of rubber, which can better complete the sealing work, and the middle position of the inner liner 3 is fixedly connected to the inner side of the hoop body 1, and the two ends of the inner liner 3 are in contact with the inner side of the hoop body 1, which is convenient for the docking of the connecting piece 2, thereby ensuring that the inner side of the inner liner 3 is fully fitted on the powder pipe 4.

[0033] A reinforcement strip 11 is further provided on the outer side of the hoop body 1 , and both ends of the reinforcement strip 11 are fixedly connected to the first connecting seat 5 and the second connecting seat 7 respectively.

[0034] Furthermore, the reinforcing strip 11 is a steel wire rope, and the two ends of the reinforcing strip 11 are welded between the first connecting seat 5 and the second connecting seat 7, and the welding position is opposite to the middle position of the locking assembly. The reinforcing strip 11 can be pulled by the first connecting seat 5 and the second connecting seat 7, so that the reinforcing strip 11 fixes the limiting hoop body 1 to strengthen the stability of the plugging working state of the plugging device on the powder hose 4.

[0035] Specifically, when using the power plant coal mill powder pipe plugging device, first find the leakage point on the powder pipe 4, surround the hoop body 1 around the outside of the leakage point of the powder pipe 4, and then wrap the hoop body 1 around the outside of the powder pipe 4. At the same time, the connecting piece 2 at one end of the hoop body 1 is inserted between the hoop body 1 and the inner liner 3 at the other end. In this way, it can ensure that the inner liner 3 is fully squeezed outside the powder pipe 4, and the connecting piece 2 can be used as a connection extension, so that the hoop body 1 can be applied to powder pipes 4 of different sizes, thereby improving the use efficiency of the plugging device.

[0036] Afterwards, ensure that the leak point on the powder hose 4 is located in the middle position of the hoop body 1, and pass the locking bolt 9 through the through hole 12 on the first connecting rod 6 and the second connecting rod 8, and connect it with the limit nut 10. As the limit nut 10 is locked, the limit nut 10 contacts and connects with the first connecting rod 6 and the second connecting rod 8, and is limited by it and cannot rotate. In this way, the locking bolt 9 is controlled to rotate, so that the positions of the first connecting seat 5 and the second connecting seat 7 can be close, thereby locking the hoop body 1;

[0037] As the locking bolt 9 is tightened, the inner dimensions of the hoop body 1 are tightened, and the inner liner 3 is tightly pressed against the outside of the powder hose 4, thereby completing the plugging of the leak on the powder hose 4. At the same time, a reinforcement strip 11 is provided on the outside of the hoop body 1, and the reinforcement strip 11 is fixed to the first connecting seat 5 and the second connecting seat 7, further strengthening the stability of the working state of the hoop body 1;

[0038] The above is the use process of the leak-proof device, and the contents not described in detail in this manual belong to the existing technology known to professional and technical personnel in this field.

[0039] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for plugging leakage of a powder pipe of a coal mill in a power plant, comprising a hoop body (1), characterized in that: A connecting piece (2) is provided at one end of the hoop body (1), a first connecting seat (5) and a second connecting seat (7) are fixed to both sides of the hoop body (1), and a locking assembly for locking the hoop body (1) is provided between the first connecting seat (5) and the second connecting seat (7); An inner liner (3) is fixed on the inner side of the hoop body (1), the hoop body (1) is wrapped around the outer side of the powder hose (4), and the hoop body (1) is connected to the powder hose (4) via the inner liner (3); A reinforcement strip (11) is further provided on the outer side of the hoop body (1), and both ends of the reinforcement strip (11) are fixedly connected to the first connecting seat (5) and the second connecting seat (7) respectively.

2. The power plant coal mill powder pipe plugging device according to claim 1, characterized in that: The hoop body (1) and the connecting piece (2) are integrated, and the thickness of the connecting piece (2) gradually becomes thinner as it moves away from the hoop body (1).

3. The device for plugging leakage of a powder tube of a coal mill in a power plant according to claim 2, characterized in that: The first connecting seat (5) and the second connecting seat (7) are also integrated with the hoop body (1), and the thickness of the connection between the first connecting seat (5) and the second connecting seat (7) and the hoop body (1) is thicker than the thickness of the hoop body (1) itself.

4. The power plant coal mill powder pipe plugging device according to claim 3, characterized in that: The hoop body (1), the connecting piece (2), the first connecting seat (5) and the second connecting seat (7) are all made of stainless steel.

5. The power plant coal mill powder pipe plugging device according to claim 1, characterized in that: The locking assembly includes a first connecting rod (6), a second connecting rod (8), a locking bolt (9) and a limiting nut (10); the first connecting rod (6) is movably mounted on the first connecting seat (5); the second connecting rod (8) is movably mounted on the second connecting seat (7); through holes (12) are provided on the first connecting rod (6) and the second connecting rod (8); the locking bolt (9) passes through the through holes (12) on the first connecting rod (6) and the second connecting rod (8) and is connected to the limiting nut (10).

6. The power plant coal mill powder pipe plugging device according to claim 5, characterized in that: The side of the limiting nut (10) is a concave arc surface structure, and the concave surface on the limiting nut (10) is fitted and connected to the outer side surfaces of the first connecting rod (6) and the second connecting rod (8).

7. The power plant coal mill powder pipe plugging device according to claim 1, characterized in that: The inner lining (3) is made of rubber, and the middle position of the inner lining (3) is fixedly connected to the inner side of the hoop body (1), and the two ends of the inner lining (3) are in contact with the inner side of the hoop body (1).

8. The power plant coal mill powder pipe plugging device according to claim 1, characterized in that: The reinforcing strip (11) is a steel wire rope, and both ends of the reinforcing strip (11) are welded to the first connecting seat (5) and the second connecting seat (7), and the welding position is opposite to the middle position of the locking assembly.

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