Cutter body structure for self-positioning head flattening and length fixing of non-ferrous metal heat exchange tube head

Abstract

A cutter body structure for self-positioning head flattening and length fixing of a non-ferrous metal heat exchange tube head comprises a cutter body, a special blade and a centering bearing, four arc-shaped positioning blocks are evenly distributed on the upper end face of the cutter body, the four arc-shaped positioning blocks are distributed in a cross shape, a circular shaft is arranged at the intersection position of the four arc-shaped positioning blocks which are distributed in the cross shape, and the special blade is arranged on the circular shaft. The centering bearing is sleeved on the circular shaft, and the special blade is arranged at the upper end of the arc-shaped positioning block through the set screw and is positioned on the rear side of the rear end surface of the arc-shaped positioning block; damage to the inner wall of the tube is greatly reduced, the length of the tube head extending out of the tube plate is consistent, beveled openings are avoided, robot welding of the tube head of the heat exchange tube is achieved, and the appearance quality of products is greatly improved; the electric hand drill is small in size, can be used after being installed on a common electric hand drill, and can also be used on other special or self-made driving mechanisms.

Description

Technical Field

[0001] The utility model belongs to the technical field of manufacturing nonferrous metal heat exchangers, in particular to a knife body structure for self-positioning flat heads and length-fixing of nonferrous metal heat exchange tube heads. Background Art

[0002] The application of fixed tube-sheet heat exchangers made of non-ferrous metals is becoming more and more widespread. In view of the improvement of the level of mechanization, robots have gradually become an important force in industrial production. They can complete various tasks efficiently and accurately, improve production efficiency and quality, and therefore put forward higher requirements for welding technology and processes. However, there are errors in the length of the ordered heat exchange tubes, and there are also errors in the shell production during the production process. In order to ensure that the length of the heat exchange tube extending out of the tube sheet is basically the same, it is necessary to flatten and fix the length before welding. At present, the existing conventional material heat exchange tubes are flattened with a homemade small bench drill bit, but when the thin-walled non-ferrous metal heat exchange tubes are flattened and fixed in length in this way, there are phenomena such as the tube end turning outward, or the tube end tearing, and the inner wall damage. It is impossible to meet the process requirements of the tube end being complete, without deformation, without flanging, without burrs, without internal damage, and with consistent extension length. Therefore, there is an urgent need for a self-positioning flat head and fixed length cutter body structure for the non-ferrous metal heat exchange tube head to solve the above problems.

[0003] In view of the above reasons, a self-positioning flat head and length-fixing cutter body structure for a nonferrous metal heat exchange tube head is developed. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a non-ferrous metal heat exchange tube head self-positioning flat head and fixed length cutter body structure, which greatly reduces the damage to the inner wall of the tube, achieves the same length of the tube head extending out of the tube sheet, and no bevel occurs, realizes robot welding of the heat exchange tube head, and greatly improves the product appearance quality; the utility model is small in size and can be used by being installed on an ordinary hand electric drill, and can also be used on other special or homemade drive mechanisms.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a self-positioning flat head and fixed-length knife body structure for a non-ferrous metal heat exchange tube head, comprising a knife body, a special blade, and a centering bearing. Four arc-shaped positioning blocks are evenly distributed on the upper end surface of the knife body, and the four arc-shaped positioning blocks are distributed in a cross shape. A circular shaft is arranged at the intersection of the four arc-shaped positioning blocks distributed in the cross shape, and the axis line of the circular shaft coincides with the axis line of the knife body. The centering bearing is sleeved on the circular shaft. The special blade is arranged at the upper end of the arc-shaped positioning block through a set screw, and is located on the rear side of the rear end surface of the arc-shaped positioning block. The knife body and the arc-shaped positioning block are formed in one piece.

[0006] Furthermore, the tool body includes a large cylinder, a small cylinder, and a frustum of a cone. The large diameter end of the frustum of a cone is arranged at the lower end of the large cylinder, and the small diameter end of the frustum of a cone is arranged at the upper end of the small cylinder. The axis lines of the large cylinder, the small cylinder, and the frustum of a cone coincide with each other. The large cylinder, the small cylinder, and the frustum of a cone are formed in one piece, and the arc-shaped positioning block is arranged on the upper end surface of the large cylinder.

[0007] Furthermore, an arc-shaped chamfer is provided at the intersection of the front end face of the arc-shaped positioning block and the upper end face of the large cylinder of the cutter body, a mounting groove is provided at the upper end of the outer side of the rear end face of the arc-shaped positioning block near the edge, a screw hole is provided in the mounting groove, the special blade is provided in the mounting groove, a step surface is provided on the upper end face of the arc-shaped positioning block, and the outer arc surface of the arc-shaped positioning block is coplanar with the outer circle of the large cylinder of the cutter body.

[0008] Furthermore, a step is provided at the lower end of the outer circumference of the circular shaft, and the circular shaft is integrally formed with the cutter body, or is fixed to the cutter body by welding, or is connected and fixed to the cutter body by internal and external threads.

[0009] The beneficial effects of the utility model are as follows: a circular shaft is arranged on the cutter body, and a bearing is mounted on the circular shaft. The axis center of the heat exchange tube is positioned through such an arrangement, which greatly reduces the damage to the inner wall of the tube. The outer arc surfaces of the four arc-shaped positioning blocks are coplanar with the cylindrical surface of the cutter body, so that the length of the tube head extending out of the tube sheet is consistent, and no bevel occurs, so that robot welding of the heat exchange tube head is realized, and the appearance quality of the product is greatly improved; a frustum is used for transition between the large cylinder and the small cylinder, which is convenient for force transmission and beautiful; the utility model is small in size and can be used by being installed on an ordinary hand drill, and can also be used on other special or self-made driving mechanisms; the utility model has a simple structure, a reasonable design, is easy to operate, and has a good use effect; the parts not described in detail in the utility model are existing common technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The utility model is further described below in conjunction with the accompanying drawings:

[0011] Figure 1 It is a schematic diagram of the general assembly structure;

[0012] Figure 2 It is a schematic diagram of the knife body structure;

[0013] Figure 3 yes Figure 2 The enlarged structural diagram at a in the middle;

[0014] In the figure: cutter body 1, large cylinder 1.1, small cylinder 1.2, frustum 1.3, arc-shaped positioning block 1.4, step surface 1.41, mounting groove 1.42, round shaft 1.5, special blade 2, centering bearing 3. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0016] like Figure 1 As shown, a non-ferrous metal heat exchange tube head self-positioning flat head and fixed length cutter body structure, including a cutter body 1, a special blade 2, and a centering bearing 3, as shown in FIG. Figure 2 As shown, the knife body 1 comprises a large cylinder 1.1, a small cylinder 1.2, and a truncated cone 1.3. The large diameter end of the truncated cone 1.3 is arranged at the lower end of the large cylinder 1.1, and the small diameter end of the truncated cone 1.3 is arranged at the upper end of the small cylinder 1.2. The axis lines of the large cylinder 1.1, the small cylinder 1.2, and the truncated cone 1.3 coincide with each other. The frustum 1.3 is integrally formed, and the arc-shaped positioning block 1.4 is arranged on the upper end face of the large cylinder 1.1; four arc-shaped positioning blocks 1.4 are evenly distributed on the upper end face of the tool body 1, and the four arc-shaped positioning blocks 1.4 are distributed in a cross shape, and a circular shaft 1.5 is arranged at the intersection of the four arc-shaped positioning blocks 1.4 distributed in a cross shape, and the axis line of the circular shaft 1.5 coincides with the axis line of the tool body 1, and a step is arranged at the lower end of the outer circumference of the circular shaft 1.5, and the circular shaft 1.5 is integrally formed with the tool body 1, or is welded and fixed to the tool body 1, or is connected and fixed to the tool body 1 by internal and external threads; the centering bearing 3 is mounted on the circular shaft 1.5, and the special blade 2 is arranged on the upper end of the outer side of the rear end face of the arc-shaped positioning block 1.4 by a set screw, and the tool body 1 and the arc-shaped positioning block 1.4 are integrally formed.

[0017] like Figure 3 As shown, an arc-shaped chamfer is arranged at the intersection of the front end face of the arc-shaped positioning block 1.4 and the upper end face of the large cylinder 1.1 of the cutter body 1, a mounting groove 1.42 is arranged at the upper end of the outer side of the rear end face of the arc-shaped positioning block 1.4 near the edge, a screw hole is arranged in the mounting groove 1.42, the special blade 2 is arranged in the mounting groove 1.42, a step surface 1.41 is arranged on the upper end face of the arc-shaped positioning block 1.4, and the outer arc surface of the arc-shaped positioning block 1.4 is coplanar with the outer circle of the large cylinder 1.1 of the cutter body 1.

[0018] During operation, the tool is installed on an ordinary hand electric drill, and the axial movement of the tool body 1 is achieved by controlling the operating tool. Specifically, the centering bearing 3 is completely inserted into the heat exchange tube, and then the operating tool is controlled to make the tool body 1 move inward along the axial direction, so that the blade 2 continues to be subjected to force after contacting the end face of the heat exchange tube. As the tool rotates, the end of the heat exchange tube moves and rotates axially with the tool, and the arc-shaped positioning block 1.4 on the tool body 1 is used to achieve the spot facing and fixed length of the heat exchange tube; after the work is completed, the tool body 1 moves outward, and the operating tool is controlled to adjust the position to achieve the spot facing and fixed length of the remaining heat exchange tubes.

[0019] The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A knife body structure for self-positioning flat head and length-fixing of a non-ferrous metal heat exchange tube head, comprising a knife body (1), a special blade (2), and a centering bearing (3), characterized in that: Four arc-shaped positioning blocks (1.4) are evenly distributed on the upper end surface of the knife body (1), and the four arc-shaped positioning blocks (1.4) are distributed in a cross shape. A circular shaft (1.5) is arranged at the intersection of the four arc-shaped positioning blocks (1.4) distributed in the cross shape, and the axis of the circular shaft (1.5) coincides with the axis of the knife body (1). The centering bearing (3) is sleeved on the circular shaft (1.5). The special blade (2) is arranged on the upper end of the arc-shaped positioning block (1.4) by means of a set screw and is located at the rear side of the rear end surface of the arc-shaped positioning block (1.4). The knife body (1) and the arc-shaped positioning block (1.4) are formed as one piece.

2. A tool body structure for self-positioning flat head and length-fixing of a nonferrous metal heat exchange tube head according to claim 1, characterized in that: The knife body (1) comprises a large cylinder (1.1), a small cylinder (1.2), and a truncated cone (1.3); the large diameter end of the truncated cone (1.3) is arranged at the lower end of the large cylinder (1.1), and the small diameter end of the truncated cone (1.3) is arranged at the upper end of the small cylinder (1.2); the axis lines of the large cylinder (1.1), the small cylinder (1.2), and the truncated cone (1.3) coincide with each other; the large cylinder (1.1), the small cylinder (1.2), and the truncated cone (1.3) are integrally formed; and the arc-shaped positioning block (1.4) is arranged on the upper end surface of the large cylinder (1.1).

3. A tool body structure for self-positioning flat head and length-fixing of a nonferrous metal heat exchange tube head according to claim 2, characterized in that: A circular chamfer is provided at the intersection of the front end surface of the arc-shaped positioning block (1.4) and the upper end surface of the large cylinder (1.1) of the cutter body (1), a mounting groove (1.42) is provided at the outer upper end of the rear end surface of the arc-shaped positioning block (1.4) near the edge, a screw hole is provided in the mounting groove (1.42), the special blade (2) is arranged in the mounting groove (1.42), a step surface (1.41) is provided on the upper end surface of the arc-shaped positioning block (1.4), and the outer arc surface of the arc-shaped positioning block (1.4) is coplanar with the outer circle of the large cylinder (1.1) of the cutter body (1).

4. The self-positioning flat head and length-fixing cutter structure for a nonferrous metal heat exchange tube head according to claim 1, characterized in that: A step is provided at the lower end of the outer circumference of the circular shaft (1.5); the circular shaft (1.5) is integrally formed with the knife body (1), or is fixed to the knife body (1) by welding, or is connected to the knife body (1) by internal and external threads.

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