Fixed-length tube cutting tool for screwed plug type tube box air cooler

Abstract

The utility model discloses a cut-to-length type pipe cutter for a screwed plug type channel air cooler, which belongs to the field of machining cutters and comprises a cutter body, a cutter strip, a positioning sleeve, an inner sleeve and an outer sleeve, the cutter strip is sleeved at the front end of the cutter body and is positioned through the positioning sleeve, the positioning sleeve is fixedly connected with the front end of the cutter body through a hexagon socket cap screw, and the inner sleeve is fixedly connected with the outer sleeve. The middle section of the cutter body is sleeved with an inner sleeve and an outer sleeve, a thrust bearing is installed between the inner sleeve and the outer sleeve, the outer wall of the front end of the inner sleeve is in threaded connection with the inner wall of the outer sleeve, and the inner sleeve is axially and fixedly connected with the cutter body through a hexagon socket set screw with a concave end. And the inner sleeve is fixedly connected with the outer sleeve through a slotted positioning screw and a hexagonal thin nut. The cutter can adjust the extension length of the finned tube during cutting as required, has a limiting function, and meets different welding process requirements.

Description

Technical Field

[0001] This utility model belongs to the field of machining tools, specifically relating to a fixed-length dicing tool for a plug-type tube box air cooler. Background Technology

[0002] In the manufacturing process of air coolers, the welding quality of finned tubes and tube sheets directly affects the structural strength, sealing performance, and heat transfer efficiency of the equipment. In existing processes, the control precision of the finned tube extension length beyond the tube sheet is insufficient, leading to defects such as uneven penetration, weld porosity, or incomplete welds during welding. In particular, when the finned tube extension length exceeds the design tolerance, the excessively long tube end causes welding thermal stress concentration, resulting in localized deformation of the tube sheet; conversely, insufficient extension length reduces the effective load-bearing area of ​​the weld, affecting the fatigue life of the joint. Due to the spatial limitations of the tube sheet plugging hole structure, operators cannot directly observe the tube end positioning status. Traditional cutting tools lack axial limiting mechanisms adapted to the welding process, resulting in significant fluctuations in tube end length during repeated cutting, failing to meet the consistency requirements of assembly gaps for precision welding processes such as argon arc deep hole welding and shielded metal arc welding. Utility Model Content

[0003] Based on the above shortcomings, this utility model provides a threaded plug type tube box air cooler fixed length tube slitting cutter, which can adjust the extension length of the finned tube during cutting as needed, and has a limiting function to meet the requirements of different welding processes.

[0004] The technical solution adopted by this utility model is as follows: A fixed-length dicing tool for a plug-type tube box air cooler includes a tool body, a tool strip, a positioning sleeve, an inner sleeve, and an outer sleeve. The tool strip is fitted at the front end of the tool body and positioned by the positioning sleeve. The positioning sleeve is fixedly connected to the front end of the tool body by a hexagon socket head cap screw. The middle section of the tool body is fitted with an inner sleeve and an outer sleeve. A thrust bearing is installed between the inner sleeve and the outer sleeve. The outer wall of the front end of the inner sleeve is threadedly connected to the inner wall of the outer sleeve. The inner sleeve is axially fixedly connected to the tool body by a hexagon socket head cap screw. The inner sleeve is fixedly connected to the outer sleeve by a slotted positioning screw and a hexagonal thin nut.

[0005] Furthermore, the outer diameter of the positioning sleeve matches the inner diameter of the finned tube to form a guiding reference.

[0006] Furthermore, the blade bar is self-lockingly fixed with a wedge-shaped groove and a V-shaped groove on the blade body.

[0007] Furthermore, the front end of the positioning sleeve is an elastic claw, which generates radial compression when inserted into the tube opening.

[0008] Furthermore, the front end of the outer jacket is provided with an annular flange.

[0009] Furthermore, the blade is a high-speed steel blade.

[0010] Advantages and benefits of this invention: This invention can ensure that the finned tube extension length is more accurate and meets welding requirements during finned tube processing, and can then be cut to length, especially suitable for tube sheets with a thickness of more than 50mm. Attached Figure Description

[0011] Figure 1 This is a perspective view of the present invention.

[0012] Figure 2 This is a cross-sectional structural diagram of the present invention. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description of this utility model is provided in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0014] Example 1

[0015] like Figure 1-2 As shown, a threaded plug type tube box air cooler fixed-length tube dicing cutter includes a cutter body 1, a cutter strip 2, a positioning sleeve 4, an inner sleeve 5, and an outer sleeve 6. The cutter strip 2 is fitted onto the front end of the cutter body 1 and positioned by the positioning sleeve 4. The positioning sleeve 4 is fixedly connected to the front end of the cutter body 1 by an internal hexagon head screw 3. The middle section of the cutter body is fitted with the inner sleeve 5 and the outer sleeve 6. A thrust bearing 7 is installed between the inner sleeve 5 and the outer sleeve 6, which prevents rotational cutting and axial adjustment from interfering with each other. The outer wall of the front end of the inner sleeve 5 is threadedly connected to the inner wall of the outer sleeve 6. The inner sleeve 5 is axially fixed to the cutter body 1 by two internal hexagon head set screws 8, and the threaded pair is bidirectionally locked to ensure that the adjustment accuracy does not fail. The inner sleeve 5 is fixedly connected to the outer sleeve 6 by a slotted positioning screw 10 and a hexagonal thin nut 9. The outer diameter of the positioning sleeve 4 matches the inner diameter of the finned tube to form a guiding reference. The cutter strip 2 is self-locked by a wedge groove and a V-groove of the cutter body 1. The outer sleeve 6 has an annular flange at its front end; the positioning sleeve 4 has an elastic claw at its front end, which generates radial compression when inserted into the tube opening and provides tactile feedback to the annular flange at the end of the outer sleeve. The blade 2 is a high-speed steel blade. This embodiment converts the cutting depth into a quantifiable and adjustable mechanical dimension chain, enabling fixed-length cutting in blind hole environments.

[0016] The front end of this utility model uses positioning sleeves 4 of different sizes selected according to the finned tube dimensions, and uses hexagon socket head cap screws 3 to fix the cutter bar 2. The distance between the outer sleeve 6 and the cutter bar 2 is determined according to the drawings and welding requirements, and it is fixed to the cutter body 1 using hexagon socket head cap set screws 8. The rear end of the cutter uses a Morse taper of 3, ensuring good positioning and transmission functions in the connection between the machine tool spindle and the rear end of the cutter. During use, after the excess steel pipe is cut to the set size, the tool will stop cutting further, thus ensuring the extended length of the finned tube.

Claims

1. A fixed-length dicing tool for a plug-type tube box air cooler, comprising a tool body (1), a tool strip (2), a positioning sleeve (4), an inner sleeve (5), and an outer sleeve (6), characterized in that: The front end of the blade body (1) is fitted with a blade strip (2) and positioned by a positioning sleeve (4). The positioning sleeve (4) is fixedly connected to the front end of the blade body (1) by an internal hexagonal head screw (3). The middle section of the blade body is fitted with an inner sleeve (5) and an outer sleeve (6). A thrust bearing (7) is installed between the inner sleeve (5) and the outer sleeve (6). The outer wall of the front end of the inner sleeve (5) is threadedly connected to the inner wall of the outer sleeve (6). The inner sleeve (5) is axially fixedly connected to the blade body (1) by an internal hexagonal head recessed set screw (8). The inner sleeve (5) is fixedly connected to the outer sleeve (6) by a slotted positioning screw (10) and a hexagonal thin nut (9).

2. The fixed-length dicing tool for a plug-type tube box air cooler according to claim 1, characterized in that: The outer diameter of the positioning sleeve (4) matches the inner diameter of the finned tube to form a guide reference.

3. The fixed-length dicing tool for a plug-type tube box air cooler according to claim 1, characterized in that: The blade (2) is fixed by a wedge groove and a V-groove of the blade body (1) through self-locking.

4. A fixed-length dicing tool for a plug-type tube box air cooler according to claim 1, characterized in that: The positioning sleeve (4) has an elastic claw at the front end, which generates radial compression when inserted into the tube opening.

5. A fixed-length dicing tool for a plug-type tube box air cooler according to claim 1, characterized in that: The front end of the outer jacket (6) is provided with an annular flange.

6. A fixed-length dicing tool for a plug-type tube box air cooler according to any one of claims 1-5, characterized in that: The blade (2) is a stainless steel blade.

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