A die for expanding the diameter of annular boss in a pressure equalizing ring liner tube.

Abstract

This utility model discloses a diameter-expanding mold for annular bosses on a pressure equalizing ring liner, belonging to the technical field of pressure equalizing ring production equipment. It includes an outer mold fixed on a base, with an inner mold inside the outer mold. The inner mold is cylindrical, forming an annular space between the inner and outer molds. An annular protrusion is provided on the outer surface of the inner mold, and a mold hole is opened on the upper end face of the inner mold. A conical hole communicating with the mold hole is also opened on the upper end face of the inner mold. In use, the liner is vertically placed into the annular space, with the two mold segments inside the liner and the outer mold outside. The press is then started, causing the press head to press down. The conical surface of the press head enters the conical hole of the inner mold, forcing the two mold segments to separate. The two mold segments cooperate with the inner wall of the outer mold to expand the diameter of the liner. Simultaneously, the annular protrusion extrudes an annular boss onto the liner. Then, the press head is lifted, and the liner is removed. The liner is now processed. Through the cooperation of the mold segments and the outer mold, the forming accuracy is high, the quality is stable, and the production efficiency is high.

Description

Technical Field

[0001] This utility model belongs to the technical field of pressure equalizing ring production equipment, and particularly relates to a diameter expansion forming mold for annular boss of pressure equalizing ring liner. Background Technology

[0002] In power transmission lines, grading rings are important protective components. Their function is to improve the voltage distribution of insulator strings and the external insulation of high-voltage electrical equipment, preventing problems such as corona discharge caused by excessively high local electric field strength. In the manufacturing process of grading ring liners, the forming of the annular boss is one of the key steps.

[0003] In the existing technology of liner manufacturing, when forming the central boss in the middle of the liner, the middle part of the liner is generally heated by high frequency heating, and then pressure is applied to both ends to make the middle part of the liner bulge to form an annular boss. Because the liner also needs to be locally heated, the production efficiency is low. Moreover, the temperature of the liner after forming is high and needs to be cooled down. However, the heating part and the pressure value applied to both ends are difficult to control, resulting in low forming accuracy and product quality, which cannot meet the requirements of high-quality and high-efficiency production. Utility Model Content

[0004] The purpose of this invention is to provide a die for expanding the diameter of the annular boss of a pressure equalizing ring liner, which solves the problems of difficult processing of the liner, insufficient precision, unstable product quality, and low production efficiency.

[0005] The present invention adopts the following technical solution: a pressure equalizing ring liner tube annular boss diameter expansion forming mold, including an outer mold fixed on a base, an inner mold provided inside the outer mold, the inner mold being cylindrical, an annular space formed between the inner mold and the outer mold, annular protrusions protruding from the outer surface of the inner mold, a mold hole opened on the upper end face of the inner mold, a conical hole communicating with the mold hole opened on the upper end face of the inner mold, the inner mold being split into two mold segments along a vertical plane passing through the axis, and also including a press, the bottom end of the press head of the press being a conical surface adapted to the conical hole.

[0006] Furthermore, an annular groove is provided on the inner sidewall of the outer mold at the position corresponding to the annular protrusion.

[0007] Furthermore, the lower end faces of the two mold lobes contract upwards from the edge of the mold hole to the edge of the outer circumference.

[0008] Furthermore, the outer arc surface of the mold lobe is an arc surface that tapers from bottom to top.

[0009] Furthermore, the top edge of the annular protrusion is parallel to the outer surface of the mold piece, the length of the top edge of the annular protrusion is 2 cm, the length of the bottom edge of the annular protrusion is 4.3 cm, and the height of the top and bottom edges is 2 cm.

[0010] Furthermore, the outer surface of the inner mold is provided with an annular groove, and the mold lobe has a half annular groove. The half annular grooves of the two mold lobes form a complete annular groove. An annular spring is provided inside the annular groove of the inner mold.

[0011] Furthermore, the annular groove on the inner mold consists of two sections, one upper and one lower.

[0012] Furthermore, a positioning post is fixedly provided on the upper end face of the base at a position corresponding to the center of the outer mold, and the positioning post is inserted into the mold hole of the inner mold.

[0013] Furthermore, the angle c between the inner surface of the conical hole of the inner mold and the horizontal plane is 60 degrees, and the angle between the conical surface of the pressure head and the horizontal plane is 60 degrees.

[0014] Furthermore, the angle α between the lower end face of the mold lobe and the horizontal plane is 5 degrees; the angle b between the outer arc surface of the mold lobe and the vertical plane is 5 degrees.

[0015] I. This utility model, through the setting of mold segments, outer mold, annular protrusion, press, and press head, allows the liner to be vertically placed into the annular space during use. The two mold segments are inside the liner, and the outer mold is outside the liner. Then, the press is started, causing the press head to press down. The conical surface of the press head enters the conical hole of the inner mold, forcing the two mold segments to separate. The two mold segments cooperate with the inner wall of the outer mold to expand the diameter of the liner. At the same time, the annular protrusion extrudes annular boss on the liner. Then, the press head is lifted, and the liner is removed. The liner is then processed. Through the cooperation of the mold segments and the outer mold, the forming accuracy is high, the quality is stable, and the production efficiency is high.

[0016] II. By setting an annular groove and an annular spring, when the press head is pressed down through the conical hole to force the two mold pieces to separate, the two mold pieces expand outward and squeeze the liner tube through the annular protrusion, so that the outer surface of the liner tube protrudes to form an annular boss. Then the press head is raised, and the two mold pieces move closer to each other under the action of the annular spring and eventually merge together. Then the liner tube is taken out. The purpose of setting the annular groove and annular spring is to facilitate the demolding of the liner tube, that is, to facilitate the separation of the liner tube from the mold pieces. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the equalizing ring and the liner in the prior art.

[0018] Figure 2 This is a schematic diagram of the internal three-dimensional structure of a uniform ring in the prior art;

[0019] Figure 3 This is a three-dimensional structural diagram of the liner tube in this utility model;

[0020] Figure 4This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0021] Figure 5 This is a front view structural diagram of the present invention;

[0022] Figure 6 This is a schematic diagram of the internal three-dimensional structure of the outer mold in this utility model;

[0023] Figure 7 This is a schematic diagram of the internal structure of the outer mold in this utility model;

[0024] Figure 8 This is a three-dimensional structural diagram of the positioning column in this utility model;

[0025] Figure 9 This is a front view schematic diagram of the positioning column structure in this utility model;

[0026] Figure 10 In this utility model Figure 9 Enlarged schematic diagram of the structure at point A in the diagram;

[0027] Figure 11 This is a schematic diagram of the three-dimensional structure of the module in this utility model.

[0028] In the diagram, 1. U-shaped structure; 2. Liner tube; 3. Base; 4. Outer mold; 5. Annular protrusion; 6. Mold hole; 7. Conical hole; 8. Mold flap; 9. Press head; 10. Annular boss; 11. Annular groove; 12. Top edge; 13. Bottom edge; 14. Annular hoop groove; 15. Annular spring; 16. Positioning post. Detailed Implementation

[0029] Please see Figure 1-11 The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0030] refer to Figure 1 and Figure 2 In existing pressure equalizing ring production, the pipe is bent into the required shape using a pipe bending machine, such as two semicircles or two U-shaped structures 1. Then, the two semicircles are joined together to form a complete circle, or the two U-shaped structures 1 are joined together to form a closed structure. The joint is then welded to fix the pressure equalizing ring. Direct welding at the joint generally does not meet the requirements. The usual practice is to use a liner 2, insert the liner 2 into the joint, and then make the joint far from the set distance to form a weld. Welding is then performed, and the molten metal of the weld fills the weld and contacts the liner 2 and the two end faces of the joint, increasing the weld strength. When welding without using the liner 2, only the outer surface of the joint is welded, and the weld strength is insufficient.

[0031] The pressure equalizing ring bushing tube annular boss diameter expansion forming mold of this utility model includes an outer mold 4 fixed on a base 3, an inner mold provided inside the outer mold 4, the inner mold is cylindrical, an annular space is formed between the inner mold and the outer mold 4, an annular protrusion 5 is provided on the outer surface of the inner mold, a mold hole 6 is opened on the upper end face of the inner mold, a conical hole 7 communicating with the mold hole 6 is opened on the upper end face of the inner mold, the inner mold is split into two mold segments 8 along the vertical plane passing through the axis, and also includes a press, the bottom end of the press head 9 of the press is a conical surface adapted to the conical hole 7.

[0032] In use, the liner 2 is vertically placed into the annular space, with the two mold segments 8 inside the liner 2 and the outer mold 4 outside. The press is then started, causing the press head 9 to press down. The conical surface of the press head 9 enters the conical hole 7 of the inner mold, forcing the two mold segments 8 to separate. The two mold segments 8 cooperate with the inner wall of the outer mold 4 to expand the diameter of the liner 2. Simultaneously, the annular protrusion 5 extrudes an annular boss 10 onto the liner 2. Then, the press head 9 is raised, and the liner 2 is removed. The liner 2 is now processed. When welding the equalizing ring, the two U-shaped joints... The components 1 are joined together to form a sealed structure. The liner 2 is inserted into the joint of the U-shaped structure 1. One end of the liner 2 is inserted into the end of one of the U-shaped structures 1, and the other end of the liner 2 is inserted into the corresponding end of the other U-shaped structure 1. The two U-shaped structures 1 are joined together, and the annular boss 10 of the liner 2 is located between the joint ends of the two U-shaped structures 1. During welding, the ends of the two U-shaped structures 1 are welded together with the annular boss 10, which increases the welding area and the welding strength.

[0033] In this embodiment, an annular groove 11 is provided on the inner sidewall of the outer mold 4 at the position corresponding to the annular protrusion 5. When in use, when the two mold petals 8 expand outward to squeeze the liner tube 2, the annular protrusion 5 of the mold petal 8 squeezes the liner tube 2, causing the position corresponding to the outer surface of the liner tube 2 to protrude outward into the annular groove 11, so that the outer surface of the liner tube 2 protrudes to form an annular boss 10. The annular protrusion 5 of the mold petal 8 and the annular groove 11 of the outer mold 4 cooperate, making it easier to form the annular boss 10 of the liner tube 2.

[0034] In this embodiment, the lower end faces of the two mold petals 8 contract upwards from the edge of the mold hole 6 as the starting point and the edge of the outer circumference as the ending point. The angle α between the lower end face of the mold petal 8 and the horizontal plane is 5 degrees. In use, when the pressure head 9 presses down through the conical hole 7 to force the two mold petals 8 to separate, the outward expansion movement of the two mold petals 8 includes the outward swinging movement of the top of the mold hole 6 as the fulcrum. When the two mold petals 8 expand outwards, the annular protrusion 5 squeezes the liner tube 2 to expand its diameter. The annular protrusion 5 cooperates with the annular groove 11, so that the outer surface of the liner tube 2 protrudes to form an annular boss 10.

[0035] In this embodiment, the outer arc surface of the mold lobe 8 is an arc surface that contracts from bottom to top. In use, since the angle α between the lower end face of the mold lobe 8 and the horizontal plane is 5 degrees, the outward expansion movement of the two mold lobe 8 includes the outward swinging movement of the top end with the mold hole 6 as the fulcrum. The outer arc surface of the mold lobe 8, being an arc surface that contracts from bottom to top, is easier to coordinate with the outward swinging movement of the top end, resulting in a more reasonable force distribution and easier work on the liner tube 2 to form an annular boss 10 on the liner tube 2.

[0036] In this embodiment, the angle b between the outer arc surface of the module 8 and the vertical plane is 5 degrees.

[0037] In this embodiment, Figure 8 For reference, the top edge 12 of the annular protrusion 5 is parallel to the outer surface of the mold lobe 8, the length of the top edge 12 of the annular protrusion 5 is 2cm, the length of the bottom edge 13 of the annular protrusion 5 is 4.3cm, and the height of the top edge 12 and the bottom edge 13 is 2cm.

[0038] In this embodiment, an annular groove 14 is provided on the outer surface of the inner mold, and half of the annular groove 14 is provided on the mold lobe 8. The half of the annular groove 14 of the two mold lobe 8 forms a complete annular groove 14. An annular spring 15 is provided in the annular groove 14 of the inner mold, and the annular spring 15 fixes the two mold lobe 8 together. In use, when the pressure head 9 presses down through the conical hole 7 to force the two mold lobe 8 to separate, the two mold lobe 8 expand outward and squeeze the liner tube 2 through the annular protrusion 5. The annular protrusion 5 cooperates with the annular groove 11, so that the outer surface of the liner tube 2 protrudes to form an annular boss 10. Then the pressure head 9 is raised, and the two mold lobe 8 move closer to each other under the action of the annular spring 15 and finally merge together. Then the liner tube 2 is taken out. The purpose of setting the annular groove 14 and the annular spring 15 is to facilitate the demolding of the liner tube 2, that is, to facilitate the separation of the liner tube 2 from the mold lobe 8.

[0039] In this embodiment, there are two annular grooves 14 on the inner mold, one on the top and one on the bottom.

[0040] The two mold pieces 8 are joined together under the clamping force of the annular spring 15 and then placed inside the outer mold 4. Since the bottom surface of the mold piece 8 is not flat, it is difficult to ensure the centering of the inner mold. The liner 2 needs to be placed in the annular space to ensure the centering of the inner mold. To solve this problem, in this embodiment, a positioning post 16 is fixedly provided at the position corresponding to the center of the outer mold 4 on the upper end surface of the base 3. When the inner mold is placed inside the outer mold 4, the positioning post 16 is inserted into the mold hole 6 of the inner mold to achieve the positioning of the inner mold.

[0041] In this embodiment, the angle c between the inner surface of the conical hole 7 of the inner mold and the horizontal plane is 60 degrees, and the angle between the conical surface of the pressure head 9 and the horizontal plane is 60 degrees.

[0042] The working principle of this utility model is as follows: Two mold pieces 8 are placed into the outer mold 4, so that the annular spring 15 is clamped into the annular groove 14, and the positioning pin 16 is inserted into the mold hole 6 of the inner mold. Then, the liner tube 2 is placed into the annular space. Then, the press is started so that the press head 9 presses down. The press head 9 forces the two mold pieces 8 to expand outward. When the two mold pieces 8 expand outward, they squeeze the liner tube 2 through the annular protrusion 5 to expand its diameter. The annular protrusion 5 cooperates with the annular groove 11 so that the outer surface of the liner tube 2 protrudes to form an annular boss 10. Then, the press head 9 is raised, and the two mold pieces 8 move closer to each other under the action of the annular spring 15 and finally merge together, so that the mold pieces 8 are separated from the liner tube 2. Then, the liner tube 2 is taken out.

Claims

1. A die for expanding and forming a ring-shaped boss of a spacer ring liner pipe, comprising an outer die (4) fixed on a base (3), characterized in that: An inner mold is provided inside the outer mold (4). The inner mold is cylindrical. An annular space is formed between the inner mold and the outer mold (4). An annular protrusion (5) is provided on the outer surface of the inner mold. A mold hole (6) is opened on the upper end face of the inner mold. A conical hole (7) is opened on the upper end face of the inner mold and communicates with the mold hole (6). The inner mold is split into two mold segments (8) along the vertical plane passing through the axis. It also includes a press. The bottom end of the press head (9) is a conical surface that matches the conical hole (7).

2. The equalizing ring bushing tube annular boss diameter expansion forming mold according to claim 1, characterized in that: The inner sidewall of the outer mold (4) is provided with an annular groove (11) at the position corresponding to the annular protrusion (5).

3. The equalizing ring bushing tube annular boss diameter expansion forming mold according to claim 1, characterized in that: The lower end faces of the two mold lobes (8) contract upwards from the edge of the mold hole (6) as the starting point and the edge of the outer circumference as the ending point.

4. The equalizing ring bushing tube annular boss diameter expansion forming mold according to claim 3, characterized in that: The outer surface of the mold lobe (8) is an arc surface that contracts from bottom to top.

5. The equalizing ring bushing tube annular boss diameter expansion forming mold according to claim 4, characterized in that: The top edge (12) of the annular protrusion (5) is parallel to the outer surface of the mold lobe (8). The length of the top edge (12) of the annular protrusion (5) is 2cm, the length of the bottom edge (13) of the annular protrusion (5) is 4.3cm, and the height of the top edge (12) and the bottom edge (13) is 2cm.

6. The equalizing ring bushing tube annular boss diameter expansion forming mold according to claim 1, characterized in that: The outer surface of the inner mold is provided with an annular groove (14), and the mold lobe (8) has a half annular groove (14). The half annular grooves (14) of the two mold lobes (8) form a complete annular groove (14); an annular spring (15) is provided in the annular groove (14) of the inner mold.

7. The equalizing ring bushing tube annular boss diameter expansion forming mold according to claim 6, characterized in that: The inner mold has two annular grooves (14), one on the top and one on the bottom.

8. The equalizing ring bushing tube annular boss diameter expansion forming mold according to claim 1, characterized in that: A positioning post (16) is fixedly provided on the upper end face of the base (3) at the position corresponding to the center of the outer mold (4), and the positioning post (16) is inserted into the mold hole (6) of the inner mold.

9. The equalizing ring bushing tube annular boss diameter expansion forming mold according to claim 1, characterized in that: The inner side of the conical hole (7) of the inner mold has an angle c of 60 degrees with the horizontal plane, and the conical surface of the pressure head (9) has an angle of 60 degrees with the horizontal plane.

10. The pressure equalizing ring liner tube annular boss diameter expansion forming mold according to claim 4, characterized in that: The angle α between the lower end face of the mold lobe (8) and the horizontal plane is 5 degrees; the angle b between the outer arc surface of the mold lobe (8) and the vertical plane is 5 degrees.

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