A head positioning structure for machining a spherical head ring joint groove by a vertical lathe

Abstract

The utility model discloses a kind of head positioning structure for machining spherical head ring joint groove of vertical lathe, annular support is provided on the top of base, head is set in the positioning hole of annular support, and the opening edge of head is higher than the upper surface of annular support, the opening edge of head is just ring joint position, so the position needs to be higher than the upper surface of annular support, fixed between annular support and base by support assembly, head is preliminarily positioned, since pull rod is fixedly connected in the middle of base, pull rod penetrates the connecting pipe hole in the middle of head, pressure plate is sleeved on pull rod, and pressure plate is located in the inside of head, pressure plate is threadedly connected on the upper portion of pull rod, and pressure plate is pressed head by tightening pressure nut, can further position head, using the above two ways to stack positioning head, can be realized without using welding mode also can realize the fixation of head.

Description

Technical Field

[0001] This utility model belongs to the field of head processing tooling, and particularly relates to a head positioning structure for processing the circumferential bevel of a spherical head using a vertical lathe. Background Technology

[0002] In recent years, with the vigorous development of pressure vessels, the requirements for pressure vessels in all aspects have been increasing. The main material of hydrogenation reactors is chromium-molybdenum steel. Chromium-molybdenum steel has relatively high requirements for appearance quality, and the owner's requirements for the appearance quality of pressure vessels are also getting higher and higher. In the past, when processing the beveling of thick-walled heads, the main method was to weld the claws on the outer wall of the head. After the head was processed, it was cut off, and the base material was ground and welded back. However, chromium-molybdenum steel is very prone to cracking after welding, which can cause quality accidents. Therefore, during product processing, it is required that there be no welding or minimal welding on the outer wall of the head (only welding the lifting lugs). However, this leads to the problem that the head is not easy to fix because the outer wall of the head is a spherical structure. Therefore, other methods are needed to fix the head. Utility Model Content

[0003] (1) Technical problem to be solved: Provide a head positioning structure for machining the circumferential bevel of a spherical head using a vertical lathe, which can fix the head without welding.

[0004] (2) The technical solution adopted by this utility model is as follows:

[0005] A head positioning structure for machining the circumferential bevel of a spherical head using a vertical lathe includes a base, an annular support above the base, a positioning hole in the center of the annular support, the inner side of the positioning hole matching the outer wall of the head, the head being positioned within the positioning hole of the annular support, and the opening edge of the head being higher than the upper surface of the annular support. The annular support and the base are fixed together by a support assembly. A pull rod is fixedly connected to the center of the base, the pull rod passing through a connecting pipe hole in the center of the head, a pressure plate being sleeved on the pull rod and located inside the head, and a clamping nut being threaded to the upper part of the pull rod.

[0006] A further technical solution is that the annular support includes an upper ring plate and a lower ring plate, and a plurality of intermediate stiffening plates are provided between the upper ring plate and the lower ring plate.

[0007] A further technical solution is that a portal-shaped seat is provided on the base, the portal-shaped seat is fixedly connected to the base, a through hole is provided in the middle of the portal-shaped seat, the lower end of the pull rod passes through the through hole, and a limit nut is threadedly connected to the lower end of the pull rod.

[0008] A further technical solution is that the support assembly includes multiple legs, the bottom of the legs is fixed to the base, the top of the legs is provided with a groove, the groove is slidably connected to a positioning tooth, the top of the legs is rotatably connected to a lead screw through a bearing seat, the lead screw passes through the positioning tooth and is threadedly connected to it, and the positioning tooth contacts the outer side of the annular support.

[0009] (3) Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows: An annular support is provided above the base, and the end cap is placed in the positioning hole of the annular support. The edge of the opening of the end cap is higher than the upper surface of the annular support. The edge of the opening of the end cap is the position of the annular seam. Therefore, this position needs to be higher than the upper surface of the annular support. The annular support and the base are fixed by a support component to initially position the end cap. Since a pull rod is fixedly connected in the middle of the base, the pull rod passes through the pipe hole in the middle of the end cap. A pressure plate is sleeved on the pull rod, and the pressure plate is located inside the end cap. The upper part of the pull rod is threaded with a clamping nut. Tightening the clamping nut makes the pressure plate press the end cap, which can further position the end cap. By using the above two methods to superimpose and position the end cap, it is possible to fix the end cap without using welding. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0011] Figure 2 yes Figure 1 A top-view structural diagram showing the state shown.

[0012] Figure 3 yes Figure 1 A schematic diagram of the structure in the side view shown;

[0013] Figure 4 This is a schematic diagram of the support leg in Embodiment 2 of this utility model;

[0014] Figure 5 This is a top view of the support leg in Embodiment 2 of this utility model;

[0015] Figure 6 This is a schematic diagram of the structure of the bottom pipe hole of the end cap described in this utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0017] like Figures 1-6 As shown.

[0018] Example 1: A positioning structure for a spherical end cap 4 with an circumferential bevel, machined on a vertical lathe, includes a base 1, an annular support 2 on top of the base 1, a positioning hole 3 in the middle of the annular support 2, the inner side of the positioning hole 3 matching the outer wall of the end cap 4, the end cap 4 being positioned within the positioning hole 3 of the annular support 2, and the opening edge of the end cap 4 being higher than the upper surface of the annular support 2, the annular support 2 being fixed to the base 1 by a support assembly, a tie rod 5 being fixedly connected to the middle of the base 1, the tie rod 5 passing through a connecting pipe hole 6 in the middle of the end cap 4, a pressure plate 7 being sleeved on the tie rod 5, and the pressure plate 7 being located inside the end cap 4, the upper part of the tie rod 5 being threadedly connected to a clamping nut 8. The annular support 2 includes an upper annular plate 9 and a lower annular plate 10, with multiple intermediate ribs 11 arranged between the upper annular plate 9 and the lower annular plate 10. A gate-shaped seat 12 is provided on the base 1. The gate-shaped seat 12 is fixedly connected to the base 1. A through hole is provided in the middle of the gate-shaped seat 12. The lower end of the pull rod 5 passes through the through hole and the lower end of the pull rod 5 is threadedly connected to the limit nut 13.

[0019] Working principle: In order to avoid welding, this utility model utilizes the characteristics of the spherical end cap 4 itself. First, the end cap 4 is hoisted into the positioning hole 3 of the annular support 2. The tie rod 5 is passed through the through hole of the portal seat 12, the pipe hole 6 of the end cap 4, and the hole in the middle of the pressure plate 7. Then, the limit nut 13 and the clamping nut 8 are assembled and the clamping nut 8 is tightened so that the pressure plate 7 presses the end cap 4. The annular support 2 is used to position the end cap 4 in the horizontal direction, and the tie rod 5, the clamping nut 8, and the limit nut 13 are used to position the end cap 4 in the vertical direction for a second time, thereby fixing the end cap 4 so that it can be beveled at the circumferential seam of the end cap 4 with the vertical lathe. In this utility model, the base 1 can be separate and can be coaxially fixed (bolted connection) with the turntable (worktable) of the vertical lathe, or the turntable (worktable) of the vertical lathe can be used as the base 1.

[0020] The annular support 2 is formed by welding and fixing the upper annular plate 9 to the intermediate stiffening plate 11, and welding and fixing the lower annular plate 10 to the intermediate stiffening plate 11. The portal-shaped seat 12 is fixedly connected to the base 1 by bolts. The pressure plate 7 is a cross-shaped plate structure. The annular support 2, the portal-shaped seat, and the pressure plate 7 are made of iron or steel.

[0021] The support assembly can adopt a structure of support legs 18, with multiple support legs 18 evenly distributed between the base 1 and the lower ring plate 10. The bottom of the support legs is fixed to the base 1 by bolts (or welding), and the top of the support legs 18 is fixed to the lower ring plate 10 by bolts (or welding). This method requires that the annular support 2 and the base 1 be coaxial, and the final end cap 4 must also be coaxial with the base 1.

[0022] Example 2: Based on Example 1, the difference is that the support assembly includes multiple legs 14, which are evenly distributed between the base 1 and the lower ring plate 10. The bottom of each leg 14 is fixed to the base 1, and the top of each leg 14 has a groove 15. Positioning teeth 16 are slidably connected inside the groove 15. The top of each leg 14 is rotatably connected to a lead screw 17 via a bearing seat. The lead screw 17 passes through the positioning teeth 16 and is threadedly connected to them. The positioning teeth 16 contact the outer side of the annular support 2. The length of the groove 15 is radially arranged along the base 1. By rotating the lead screw 17, the positioning teeth 16 can be moved. The multiple positioning teeth 16 can be used to adjust the horizontal position of the annular support 2 for centering.

[0023] The above are merely preferred embodiments of this utility model.

Claims

1. A head positioning structure for machining the circumferential bevel of a spherical head using a vertical lathe, characterized in that, The device includes a base (1), an annular support (2) is provided above the base (1), a positioning hole (3) is provided in the middle of the annular support (2), the inner side of the positioning hole (3) matches the outer wall of the end cap (4), the end cap (4) is set in the positioning hole (3) of the annular support (2), and the opening edge of the end cap (4) is higher than the upper surface of the annular support (2). The annular support (2) and the base (1) are fixed together by a support assembly. A pull rod (5) is fixedly connected in the middle of the base (1). The pull rod (5) passes through the pipe hole (6) in the middle of the end cap (4). A pressure plate (7) is sleeved on the pull rod (5), and the pressure plate (7) is located inside the end cap (4). A tightening nut (8) is provided on the upper part of the pull rod (5) by a threaded connection.

2. The head positioning structure for machining the circumferential bevel of a spherical head using a vertical lathe according to claim 1, characterized in that, The annular support (2) includes an upper ring plate (9) and a lower ring plate (10), and multiple intermediate stiffeners (11) are provided between the upper ring plate (9) and the lower ring plate (10).

3. The head positioning structure for machining the circumferential bevel of a spherical head using a vertical lathe according to claim 1, characterized in that, A gate-shaped seat (12) is provided on the base (1). The gate-shaped seat (12) is fixedly connected to the base (1). A through hole is provided in the middle of the gate-shaped seat (12). The lower end of the pull rod (5) passes through the through hole. The lower end of the pull rod (5) is threadedly connected to the limiting nut (13).

4. The head positioning structure for machining the circumferential bevel of a spherical head using a vertical lathe according to claim 1, characterized in that, The support assembly includes multiple legs (14), the bottom of the legs (14) is fixed to the base (1), the top of the legs (14) is provided with a groove (15), the groove (15) is slidably connected to a positioning tooth (16), the top of the legs (14) is rotatably connected to a lead screw (17) through a bearing seat, the lead screw (17) passes through the positioning tooth (16) and is threadedly connected to it, and the positioning tooth (16) contacts the outer side of the annular support (2).

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