Air pre-heater heat exchange tube welded junction cutting device

Abstract

The utility model discloses a welded junction cutting device, and particularly relates to a welded junction cutting device for a heat exchange tube of an air pre-heater, which comprises a main shaft, a cutter is connected onto the main shaft, a guide mechanism is arranged at the front end of the cutter, and the guide mechanism is connected onto the main shaft. The tool is used for cutting the air pre-heater heat exchange tube, and a notch is flat, free of burrs and free of polishing; a guide mechanism is arranged in the device, so that the operation difficulty is reduced, and the safety is improved; the device is simple in structure, stable, reliable and convenient to operate, mechanisms are fixed through threads, assembly and disassembly are convenient, and the maintenance difficulty is reduced; the power mechanism is high in adaptability, and most power tools on the market can serve as the power mechanism of the power mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, in particular to a device for cutting welded joints of heat exchange tubes of air preheaters. Background Art

[0002] In order to improve the thermal efficiency of the boiler and reduce the heat loss of flue gas, an air preheater is usually installed at the tail of the boiler. When the flue gas containing SO2 and SO3 drops to its dew point temperature after heat exchange, "condensation" will occur. These dew drops form highly corrosive sulfuric acid and sulfurous acid solutions that will corrode metal equipment. In addition, the fuel contains ash. When exhausting smoke, solid particles are easily deposited on the tube bundle to form ash accumulation. The ash accumulation is mostly a mixture of various components such as ammonium bisulfate and dust particles, which will cause corrosion and damage to the heat exchange tubes of the air preheater. In order to ensure the normal operation of the air preheater and avoid accidents, the heat exchange tubes need to be replaced when they are severely corroded, ash accumulated, worn or have reduced efficiency. Utility Model Content

[0003] In order to solve the problems existing in the above-mentioned prior art, the utility model provides a device for cutting the weld of heat exchange tube of air preheater to solve the current technical problems.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] The utility model provides a device for cutting welds of heat exchange tubes of air preheaters, comprising a main shaft, a tool is connected to the main shaft, a guide mechanism is arranged at the front end of the tool, and the guide mechanism is connected to the main shaft.

[0006] Preferably, the outer diameter of the bearing at the front end of the tool is slightly smaller than the inner diameter of the heat exchange tube, and the cutting diameter of the tool is larger than the outer diameter of the heat exchange tube.

[0007] Preferably, the main shaft is symmetrically provided with a first opening groove, the tool is symmetrically provided with a second opening groove, and the first opening groove and the second opening groove are connected with stoppers.

[0008] Preferably, the tool comprises a tool holder and a detachable blade.

[0009] Preferably, the guide mechanism comprises a guide shaft and a bearing, one end of the guide shaft passes through the inner hole of the tool and is threadedly connected to the main shaft, and the other end of the guide shaft is provided with a bearing.

[0010] Preferably, the tool is sleeved on the main shaft, and the guide shaft and the main shaft clamp the tool via a shoulder.

[0011] Preferably, a retaining ring for limiting axial movement of the bearing is provided on the guide shaft.

[0012] The beneficial effects of the utility model are as follows: the application adopts a tool to cut the air preheater heat exchange tube, and the incision is smooth and free of burrs and does not require grinding; a guide mechanism is provided in the device, which reduces the difficulty of operation and increases safety; the device has a simple structure, is stable and reliable, and is easy to operate. Threaded fixation is adopted between the mechanisms, which facilitates assembly and disassembly and reduces the difficulty of maintenance; the application has strong adaptability, and most power tools on the market can be used as the power mechanism of the application. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0014] Figure 1 It is a structural schematic diagram of a device for cutting welded joints of heat exchange tubes of an air preheater according to an embodiment of the utility model;

[0015] Figure 2 It is a schematic cross-sectional structural diagram of a device for cutting welded joints of heat exchange tubes of an air preheater according to an embodiment of the utility model;

[0016] Figure 3 It is a structural schematic diagram of an air preheater heat exchange tube weld cutting device according to an embodiment of the utility model.

[0017] Description of Reference Numerals

[0018] exist Figure 1-Figure 3 In the figure, the main shaft 1; the block 2; the tool 3; the guide mechanism 4; the tool holder 5; the blade 6; the guide shaft 7; the bearing 8; and the retaining ring 9. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions 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. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The utility model provides a device for cutting welded joints of heat exchange tubes of air preheaters, comprising: a main shaft 1, a stopper 2, a tool 3, and a guide mechanism 4. The tool 3 comprises a tool holder 5 and a blade 6, and the guide mechanism 4 comprises a guide shaft 7 and a bearing 8.

[0021] The spindle 1 is symmetrically provided with a first opening groove, in which a stopper 2 is fixed by a thread, and a part of the stopper 2 protrudes from the surface of the spindle 1; the inner hole of the tool holder 5 is inserted into one side of the threaded hole of the spindle 1, and the protruding part of the stopper 2 is inserted into the second opening groove symmetrically provided on the tool 3, which is used to limit the rotation of the tool 3, and the other side of the tool holder 5 is fixed with a blade 6 by a thread. The threaded rod side of the guide shaft 7 passes through the inner hole of the tool 3 and is threadedly matched with the spindle 1, and the movement of the tool 3 is limited by clamping the tool 3, and the other end of the guide shaft 7 is sleeved with a bearing 8 and the displacement is limited by a retaining ring 9.

[0022] The working principle of the air preheater heat exchange tube weld cutting device of the present application is: one end of the main shaft 1 is connected to a power device (electric, pneumatic, or hydraulic) to provide rotational power for cutting, and the bearing 8 is inserted into the tube where the weld is to be cut; when the power device is turned on to drive the cutting device to rotate and push the device forward, the blade 6 on the tool 3 rotates to cut the tube and the weld, and the bearing 8 can move back and forth in the tube and provide positioning for the device to withstand radial force.

[0023] The key to the tube sheet weld cutting device is that the outer diameter of the positioning bearing 8 at the front end of the tool 3 is slightly smaller than the inner diameter of the heat exchange tube; the cutting diameter of the tool 3 is larger than the outer diameter of the heat exchange tube, wherein the cutting diameter of the tool 3 refers to the diameter of the largest circle that can be formed by the cutting surface of the tool 3 during the cutting process. At the same time, the blade 6 of the tool 3 cuts off part of the original weld while cutting the tube body, so that the tube body is separated from the tube sheet, and the original molten pool is basically unchanged. A weld refers to a joint formed by connecting two or more metal workpieces together through the welding process. A molten pool refers to the part of the parent material that is melted into a pool due to the heat of the welding arc. The liquid metal part with a certain geometric shape formed on the weldment during fusion welding is called a molten pool.

[0024] The optimized structure adopts a tool holder 5 + replaceable blade 6, which can be quickly replaced after the blade is broken, and other types of blades 6 (such as chamfering cutters, corner fillet cutters, etc.) can also be replaced to perform specific types of cutting.

[0025] Optimally, tool 3 can be replaced by a high wear-resistant internal grinding wheel.

[0026] Optimally, the selection of the tool holder 5 and the number of installed blades 6 can be changed according to requirements.

[0027] Optimally, the spindle 1, the tool 3 and the guide shaft 7 can be integrally machined.

[0028] Optimally, a combined tool 3 can be used to simultaneously cut the weld seam of the welded pipe and process the welding groove, such as installing two blades 6 for cutting the plane and cutting the welding groove.

[0029] Optimally, the connection method of the stopper 2 can be welding, etc., or the stopper 2 and the first opening groove on the spindle can be eliminated, and a symmetrical boss is added to the shoulder surface of the spindle to cooperate with the second opening groove of the tool.

[0030] The present application uses a tool 3 to cut the air preheater heat exchange tube, and the incision is smooth and burr-free and does not require grinding; a guide mechanism 4 is provided in the device, which reduces the difficulty of operation and increases safety; the device has a simple structure, is stable and reliable, and is easy to operate. Threaded fixation is used between the mechanisms, which makes assembly and disassembly convenient and reduces the difficulty of maintenance; the present application has strong adaptability, and most power tools on the market can be used as the power mechanism of the present application.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 protection scope of the present invention.

Claims

1. An air preheater heat exchange tube weld cutting device, comprising: A spindle, characterized in that: a tool is connected to the spindle, a guide mechanism is provided at the front end of the tool, and the guide mechanism is connected to the spindle; the outer diameter of the bearing at the front end of the tool is slightly smaller than the inner diameter of the heat exchange tube, and the cutting diameter of the tool is larger than the outer diameter of the heat exchange tube; the guide mechanism includes a guide shaft and a bearing, one end of the guide shaft passes through the inner hole of the tool and is threadedly connected to the spindle, and a bearing is provided on the other end of the guide shaft; the tool is sleeved on the spindle, and the guide shaft and the spindle clamp the tool through a shoulder.

2. The device for cutting weld joints of heat exchange tubes of air preheater according to claim 1 is characterized in that: A retaining ring for limiting the axial movement of the bearing is arranged on the guide shaft.

3. The device for cutting weld joints of heat exchange tubes of air preheater according to claim 1, characterized in that: The main shaft is symmetrically provided with a first opening groove, the tool is symmetrically provided with a second opening groove, and the first opening groove and the second opening groove are connected with stoppers.

4. The device for cutting weld joints of heat exchange tubes of air preheater according to claim 1, characterized in that: The tool comprises a tool holder and a detachable blade.

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