Capacitor hanger welding method

Abstract

This invention relates to the field of capacitor manufacturing technology and provides a capacitor hanger welding method, comprising the following steps: Step 1, placing the hanger on a positioning cone, placing a nut at the corresponding position on the hanger, positioning the nut and hanger by the positioning cone, and spot welding the connection between the nut and the hanger; Step 2, spot welding the hanger with the nut to the top left and right sides and the bottom left and right sides of the capacitor housing; Step 3, placing a first welding fixture on the front and rear sides of the capacitor housing, and placing a second welding fixture on the left and right sides of the capacitor housing, and fixing the first and second welding fixtures with bolts and nuts. The positioning cone can position the hanger and nut, ensuring a corresponding state between them, preventing deviations caused by nut movement during welding, which could prevent the nut from being welded to the designated position on the hanger, thus hindering capacitor housing assembly and improving product consistency.

Description

Technical Field

[0001] This invention relates to the field of capacitor manufacturing technology, and more specifically, to a capacitor hanging rod welding method. Background Technology

[0002] Currently, the general process for producing capacitor casings involves spot welding the lifting pins to the casing, positioning the flange nuts via a welding frame, and using argon arc welding for welding. This welding process requires three rotations to ensure proper spacing between the nuts, which means the nuts cannot be centered with the holes during welding. Furthermore, the capacitor nut welding method has several problems, such as the lifting pin hole diameter being larger than the nut's inner diameter and the lifting pin's tendency to move. These issues make it easy for deviations to occur during capacitor assembly and for installation to be difficult. Summary of the Invention

[0003] The problem solved by this invention is how to avoid the capacitor housing failing to meet requirements due to deviation of the nut during welding.

[0004] To address the above problems, the present invention provides a capacitor hanging rod welding method, comprising the following steps: Step 1: Place the lifting rod on the positioning cone, place a nut at the corresponding position on the lifting rod, and position the nut and the lifting rod by the positioning cone. Spot weld the connection between the nut and the lifting rod to fix them. Step 2: Spot weld the lifting brackets, after spot welding the nuts, to the top left and right sides and the bottom left and right sides of the capacitor housing respectively; Step 3: Place the first welding fixture on the front and rear sides of the capacitor housing, place the second welding fixture on the left and right sides of the capacitor housing, and fix the first welding fixture and the second welding fixture with bolts and nuts; Step 4: Weld the contact positions of the nut and the lifting rod, and the contact positions of the lifting rod and the capacitor housing.

[0005] Compared with the prior art, the capacitor hanging welding method of the present invention has the following advantages: The positioning cone can be used to position the lifting plate and nut, ensuring that the lifting plate and nut are in a corresponding state. This avoids deviations caused by nut shaking or lifting plate movement during welding, which could prevent the nut from being welded to the designated position on the lifting plate and thus prevent the capacitor shell from being assembled. This improves product consistency and quality stability.

[0006] Optionally, in step 1, the hanging bracket includes a straight portion and bent portions disposed at both ends of the straight portion. The straight portion is disposed along the width direction of the capacitor housing, and the bent portions are perpendicular to the straight portion. The straight portion has two first circular holes, and the bent portions have a second circular hole.

[0007] Optionally, the upper surface of the positioning cone is a capacitor housing length mounting surface, and a capacitor housing width mounting groove is provided in the middle of the capacitor housing length mounting surface. A first cone angle for inserting into the second circular hole is fixed on the capacitor housing length mounting surface, and a second cone angle for inserting into the first circular hole is fixed in the capacitor housing width mounting groove.

[0008] Optionally, the positioning cone includes four first cone angles and four second cone angles. The positional distribution of the four first cone angles is adapted to the positional distribution of the second circular holes of the four hanging rods after the hanging rods are welded to the capacitor housing. The positional distribution of the four second cone angles is adapted to the positional distribution of the first circular holes of the four hanging rods after the hanging rods are welded to the capacitor housing.

[0009] Optionally, the depth of the capacitor housing width mounting groove is greater than the height of the second cone angle.

[0010] Optionally, in step 2, the hanging brackets located on the same surface of the capacitor housing are symmetrically arranged, and the width of the hanging brackets is reduced by 1 to 2 mm relative to the width of the capacitor housing.

[0011] Optionally, in step 3, both the first welding fixture and the second welding fixture are rectangular frame structures, and through holes are provided at the four corners of both the first welding fixture and the second welding fixture. The four through holes of the first welding fixture correspond to the second circular holes of the four lifting surfaces, respectively; the four through holes of the second welding fixture correspond to the first circular holes of the two lifting surfaces on the same left or right side, respectively.

[0012] Optionally, the bolt passes through the corresponding first circular hole and the through hole or the second circular hole and the through hole and is then locked by the nut to fix the first welding fixture or the second welding fixture to the lifting climber.

[0013] Optionally, in step 4, the capacitor housing after the first welding fixture and the second welding fixture are installed is transferred to the welding workbench of the welding robot. The robotic arm of the welding robot clamps and fixes the first welding fixture and the second welding fixture. The welding robot then flips the capacitor housing and welds the connection between the capacitor housing and the lifting rod, and between the lifting rod and the nut.

[0014] Optionally, after step 4, the capacitor housing is inspected, and the inspection process includes surface treatment and thread inspection. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of mounting the first welding frame and the second welding frame on the capacitor housing in an embodiment of the present invention; Figure 2 This is a front view of the capacitor housing mounting bracket in an embodiment of the present invention; Figure 3 This is a top view of the capacitor housing mounting bracket in an embodiment of the present invention; Figure 4 This is a schematic diagram of the hanging climbing structure in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the hanging device and the first cone angle in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the hanging bracket and the second cone angle in an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1. Capacitor housing; 2. Hanging bracket; 3. Nut; 4. Positioning cone; 5. First welding frame; 6. Second welding frame; 21. First round hole; 22. Second round hole; 41. Capacitor housing width mounting groove; 42. Second cone angle; 43. First cone angle. Detailed Implementation

[0016] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0017] In the attached figures, the Z-axis represents the vertical direction, i.e., the up-down position, with the positive direction of the Z-axis representing the top and the negative direction representing the bottom; the X-axis represents the horizontal direction and is designated as the left-right position, with the positive direction of the X-axis representing the right side and the negative direction representing the left side; the Y-axis represents the front-back position, with the positive direction of the Y-axis representing the rear side and the negative direction representing the front side. It should be noted that the aforementioned representations of the Z-axis, Y-axis, and X-axis are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0018] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] In the description of this specification, references to terms such as "embodiment," "one embodiment," and "one implementation" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or illustrative implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0021] like Figure 1 , Figure 2 , Figure 3 as well as Figure 6 As shown, this embodiment of the invention provides a capacitor hanging rod welding method, including the following steps: Step 1: Place the lifting rod 2 on the positioning cone 4, place the nut 3 at the corresponding position of the lifting rod 2, and position the nut 3 and the lifting rod 2 by the positioning cone 4. Spot weld the connection between the nut 3 and the lifting rod 2 to fix them. Step 2: Spot weld the lifting brackets 2, after spot welding the nuts 3, to the top left and right sides and the bottom left and right sides of the capacitor housing 1 respectively; Step 3: Place the first welding fixture 5 on the front and rear sides of the capacitor housing 1, place the second welding fixture 6 on the left and right sides of the capacitor housing 1, and fix the first welding fixture 5 and the second welding fixture 6 with bolts and nuts 3. Step 4: Weld the contact points between the nut 3 and the lifting rod 2, and between the lifting rod 2 and the capacitor housing 1.

[0022] It should be noted that in the traditional welding process of the lifting cap 2, nut 3 and capacitor housing 1, the lifting cap 2 is usually welded to the surface of the capacitor housing 1 first, and then the nut 3 is welded. However, since the hole diameter of the lifting cap 2 is larger than the inner diameter of the nut 3, it is not conducive to the positioning of the nut 3 and the lifting cap 2, which often leads to deviation of the nut 3 during welding.

[0023] In this embodiment, there are two first welding fixtures 5, two second welding fixtures 6, sixteen nuts 3, four lifting hooks 2, and the number of bolts is equal to the number of nuts 3, and the bolts can be matched with the corresponding nuts 3.

[0024] It should be further explained that in step 4, the welding of the contact position between the nut 3 and the lifting plate 2, and the contact position between the lifting plate 2 and the capacitor housing 1 can be done manually or by a welding robot. The specific welding process will be described later.

[0025] Reference Figure 4 As shown, in step 1, the hanging bracket 2 includes a straight portion and bent portions disposed at both ends of the straight portion. The straight portion is disposed along the width direction of the capacitor housing 1, and the bent portions are perpendicular to the straight portion. The straight portion has two first circular holes 21, and the bent portions have second circular holes 22.

[0026] It should be noted that both the first circular hole 21 and the second circular hole 22 of the lifting pin 2 need to be welded and fixed to the nut 3. The purpose of the positioning cone 4 is twofold: firstly, to ensure that the first circular hole 21 or the second circular hole 22 is coaxial with the threaded hole of the nut 3, thus guaranteeing the accuracy of the nut 3 during welding; and secondly, to limit the shaking of the lifting pin 2 during the welding process with the nut 3, preventing deviations during welding. Furthermore, the bent portion of the lifting pin 2 extends along the length of the capacitor housing 1, increasing the weldable positions between the lifting pin 2 and the capacitor housing 1, and improving the connection strength between the lifting pin 2 and the capacitor housing 1.

[0027] Spot welding is a welding method that forms a weld point between the contact surfaces of two overlapping workpieces. In this embodiment, the contact surface between the lifting cap 2 and the nut 3 is approximately annular. Spot welding is performed on the contact surface between the lifting cap 2 and the nut 3 to achieve the effect of initially fixing the nut 3 to the surface of the lifting cap 2. This is beneficial for the nut 3 and the lifting cap 2 to maintain their positioning state during subsequent assembly. Similarly, in step 2, the lifting cap 2 is spot welded to the capacitor housing 1 to fix the lifting cap 2 to the surface of the capacitor housing 1. In the subsequent welding process, the weld length between the lifting cap 2 and the capacitor housing 1 is increased.

[0028] Reference Figure 5As shown, the upper surface of the positioning cone 4 is the capacitor housing length mounting surface. A capacitor housing width mounting groove 41 is provided in the middle of the capacitor housing length mounting surface. A first cone angle 43 for inserting the second circular hole 22 is fixed on the capacitor housing length mounting surface, and a second cone angle 42 for inserting the first circular hole 21 is fixed in the capacitor housing width mounting groove.

[0029] When performing welding, such as Figure 6 As shown, first, place the lifting bracket 2 in the capacitor housing mounting groove 41, so that the second cone angle 42 is inserted into the first round hole 21 of the lifting bracket 2, so that the second cone angle 42 positions the lifting bracket 2 and restricts its movement. Then, put the nut 3 on the corresponding second cone angle 42, so that the nut 3 and the first round hole 21 of the lifting bracket 2 are coaxial, so as to avoid the welding position of the nut 3 being deviated. After the nut 3 is positioned, spot weld the nut 3 to the lifting bracket 2 to fix the nut 3 initially.

[0030] Optionally, the capacitor housing 1 is placed into the capacitor housing mounting groove 41, so that the hanging rod 2 contacts the edge of the surface of the capacitor housing 1, and the hanging rod 2 is spot welded to the capacitor housing 1. Following the above method, the two hanging rods 2 are initially fixed to the capacitor housing 1. Then, the capacitor housing 1 is rotated 180° to change its direction, and the other two hanging rods 2 are initially fixed to the capacitor housing 1, so that the hanging rods 2 with nuts 3 are sequentially welded to the end of the capacitor housing 1, so as to fix the nuts 3 while ensuring that the nuts 3 are coaxial with the first circular hole 21.

[0031] Optionally, when welding the nut 3 at the position of the second circular hole 22, the lifting cap 2 is spot-welded to the surface of the capacitor housing 1, and the capacitor housing 1 is then placed as shown in the image. Figure 5 The capacitor housing 1 is positioned as shown, with the length of the capacitor housing mounting surface in place. The first cone angle 43 is inserted into the second circular hole 22 of the hanging bracket 2. The nut 3 is then fitted onto the first cone angle 43, ensuring that the nut 3 and the second circular hole 22 are coaxial. The nut 3 is then welded to the bent portion of the hanging bracket 2. Following this method, the capacitor housing 1 is rotated 180° or its direction is reversed in sequence. The nuts 3 are then welded to the positions of the second circular holes 22 of the four hanging brackets 2, ensuring that there is no deviation when welding the nuts 3 to the second circular holes 22.

[0032] Alternatively, after welding the nut 3 at the position of the second round hole 22, the hanging rod 2 can be spot welded to the surface of the capacitor housing 1.

[0033] It should be further explained that the positioning cone 4 includes four first cone angles 43 and four second cone angles 42. The positional distribution of the four first cone angles 43 is adapted to the positional distribution of the second circular holes 22 of the four hanging rods 2 after they are welded to the capacitor housing 1. The positional distribution of the four second cone angles 42 is adapted to the positional distribution of the first circular holes 21 of the four hanging rods 2 after they are welded to the capacitor housing 1.

[0034] In this embodiment, the capacitor housing mounting groove 41 is rectangular, and the width of the capacitor housing mounting groove 41 is adapted to the width of the capacitor housing 1. The second cone angle 42 is distributed at the four corners of the capacitor housing mounting groove 41. When the capacitor housing 1 is as shown... Figure 6 When the state setting is shown, the second cone angle 42 can simultaneously pass through the first circular hole 21 on the surfaces of the two lifting pins 2 to position the lifting pin 2, which improves the welding efficiency of the nut 3 and reduces the number of times it is flipped.

[0035] Furthermore, the first cone angle 43 is also rectangularly distributed on the mounting surface along the length of the capacitor casing, making the capacitor casing 1 as shown in the image. Figure 5 When the state setting is shown, the first cone angle 43 can be inserted into the second round hole 22 of the four lifting pins 2 at the same time, so as to position the lifting pins 2 and facilitate the assembly of the nuts 3. The welding of the second round hole 22 and the nut 3 can be completed by simply flipping the capacitor housing 1 once, without having to rotate the capacitor housing 1 again, which improves the welding efficiency.

[0036] The depth of the mounting groove in the capacitor housing width is greater than the height of the second cone angle 42.

[0037] By placing the second cone angle 42 completely within the mounting groove of the capacitor housing width, it is possible to avoid the capacitor housing 1 being like... Figure 5 When placed on the upper surface of the positioning cone 4, the second cone angle 42 interferes with the capacitor, thus preventing scratches on the surface of the capacitor housing 1 during manual flipping.

[0038] In step 2, the hanging brackets 2 are symmetrically arranged on the same surface of the capacitor housing 1, and the width of the hanging brackets 2 is reduced by 1-2 mm relative to the width of the capacitor housing 1. The direction of the aforementioned width is as follows: Figure 1 The Y-axis direction is shown.

[0039] It should be noted that the capacitor housing 1 of the lifting bracket 2 is a welded assembly. To ensure that the dimensions after welding meet the requirements and to avoid interference when installing the positioning cone 4, a certain amount of space needs to be designed during welding. Reducing the width of the lifting bracket by 1-2mm creates a clearance fit, which meets the above requirements.

[0040] See Figure 1As shown, in step 3, both the first welding fixture 5 and the second welding fixture 6 are rectangular frame structures. Through holes are provided at the four corners of both the first welding fixture 5 and the second welding fixture 6. The four through holes of the first welding fixture 5 correspond to the second round holes 22 on the surface of the four lifting rods 2 respectively. The four through holes of the second welding fixture 6 correspond to the first round holes 21 on the surface of the two lifting rods 2 on the same left or right side respectively.

[0041] After the nut 3 is spot-welded to the lifting bracket 2 and the lifting bracket 2 is spot-welded to the capacitor housing 1, the nut 3 is coaxial with the first round hole 21 or the second round hole 22. The first welding fixture 5 is set on the front or rear side of the capacitor housing 1, and bolts are used to pass through the through hole and the second round hole on the surface of the first welding fixture 5 in sequence and threadedly engage with the nut 3, thereby fixing the first welding fixture 5 to the front and rear sides of the capacitor housing 1. Similarly, the second welding fixture 6 is set on the left and right sides of the capacitor housing 1, and bolts are used to pass through the through hole and the first round hole 21 on the surface of the second welding fixture 6 in sequence and threadedly engage with the nut 3, thereby fixing the second welding fixture 6 to the front and rear sides of the capacitor housing 1.

[0042] In summary, after the bolt passes through the corresponding first circular hole 21 and through hole or the second circular hole 22 and through hole, it is locked with a nut to fix the first welding fixture 5 or the second welding fixture 6 to the lifting arm 2. When the first welding fixture 5 and the second welding fixture 6 are installed, on the one hand, it facilitates connection with the welding robot, and on the other hand, it increases the connection strength between the lifting arm 2 and the capacitor housing 1. Even if the spot weld between the lifting arm 2 and the capacitor housing 1 breaks, the lifting arm 2 can still maintain its position.

[0043] Optionally, when welding the nut 3 to the lifting rod 2 and the lifting rod 2 to the capacitor housing 1, the connections can be welded manually or by a welding robot. In this embodiment, in step 4, a welding robot is used for welding. Specifically, the capacitor housing 1, after being fitted with the first welding fixture 5 and the second welding fixture 6, is transferred to the welding worktable of the welding robot. The robotic arm of the welding robot clamps and fixes the first welding fixture 5 and the second welding fixture 6, and the welding robot flips the capacitor housing 1 and welds the connections between the capacitor housing 1 and the lifting rod 2 and the lifting rod 2 and the nut 3.

[0044] Since the lifting device 2 is welded to different positions on the capacitor shell 1 during welding, the welding robot can directly flip the capacitor shell 1 when it needs to be flipped to complete the welding change, reducing the intensity of manual labor and improving the degree of automation. After welding is completed, the bolts are unscrewed, disengaging them from the nut 3, thereby releasing the constraints on the first welding fixture 5 and the second welding fixture 6.

[0045] It should be further noted that in this embodiment, when the welding robot welds the lifting cap 2 and the capacitor housing 1, as well as when it welds the lifting cap 2 and the nut 3, it uses argon arc welding. The welding current is 135A to 145A, the welding speed is 2.7mm / s to 3mm / s, and the welding wire diameter is 1.6mm, which can ensure the stability of the weld.

[0046] After step 4, the capacitor housing 1 is inspected and processed. The inspection and processing steps include surface treatment and thread inspection.

[0047] It should be noted that, in order to ensure that the capacitor housing 1 meets the requirements, inspection and processing are required. In this embodiment, the surface treatment adopts shot blasting and painting. The shot blasting time is 10 minutes for each of the forward and reverse rotations of the capacitor housing 1. It should be further noted that the stainless steel shot used in the shot blasting process has a diameter of 0.5 mm. Thread inspection includes dimensional measurement, torque testing, visual inspection, and go / no-go gauge testing. Dimensional measurement uses measuring tools such as calipers and micrometers to check the dimensions of the thread, including pitch, outer diameter, inner diameter, and wall thickness, to ensure that it meets the dimensional requirements. Torque testing is to test the torque of the threaded connection to ensure that the tightening force of the threaded connection meets the requirements. In this embodiment, a suitable wrench or torque meter is used to perform appropriate tightening or loosening tests on the thread, and the required torque value is recorded. Visual inspection checks whether the thread surface is uniform and smooth, without obvious dents, scratches, or other surface defects. Go / no-go gauge testing uses a go / no-go gauge in conjunction with the nut 3 to determine whether the nut 3 is qualified, which is conducive to unifying product standards.

[0048] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method of welding a capacitor hanger, characterized by, Includes the following steps: Step 1: Place the lifting rod (2) on the positioning cone (4), place the nut (3) at the corresponding position of the lifting rod (2), and position the nut (3) and the lifting rod (2) by the positioning cone (4). Spot weld the connection between the nut (3) and the lifting rod (2) to fix them. Step 2: Spot weld the lifting rod (2) after spot welding the nut (3) to the top left and right sides and the bottom left and right sides of the capacitor housing (1); Step 3: Place the first welding fixture (5) on the front and rear sides of the capacitor housing (1), place the second welding fixture (6) on the left and right sides of the capacitor housing (1), and fix the first welding fixture (5) and the second welding fixture (6) with bolts and nuts (3); Step 4: Weld the contact positions of the nut (3) and the lifting rod (2) and the contact positions of the lifting rod (2) and the capacitor housing (1).

2. The method of claim 1, wherein, In step 1, the hanging bracket (2) includes a straight portion and a bent portion disposed at both ends of the straight portion. The straight portion is disposed along the width direction of the capacitor housing (1), and the bent portion is perpendicular to the straight portion. The straight portion has two first circular holes (21), and the bent portion has a second circular hole (22).

3. The method of claim 2, wherein, The upper surface of the positioning cone (4) is the capacitor housing length mounting surface. A capacitor housing width mounting groove (41) is provided in the middle of the capacitor housing length mounting surface. A first cone angle (43) for inserting the second round hole (22) is fixed on the capacitor housing length mounting surface. A second cone angle (42) for inserting the first round hole (21) is fixed in the capacitor housing width mounting groove.

4. The method of claim 3, wherein, The positioning cone (4) includes four first cone angles (43) and four second cone angles (42). The position distribution of the four first cone angles (43) is adapted to the position distribution of the second round holes (22) of the four hanging rods (2) after the hanging rods (2) are welded to the capacitor housing (1). The position distribution of the four second cone angles (42) is adapted to the position distribution of the first round holes (21) of the four hanging rods (2) after the hanging rods (2) are welded to the capacitor housing (1).

5. The method of claim 3, wherein, The depth of the mounting groove for the capacitor housing width is greater than the height of the second cone angle (42).

6. The method of claim 1, wherein, In step 2, the hanging rods (2) located on the same surface of the capacitor housing (1) are symmetrically arranged, and the width of the hanging rods (2) is reduced by 1 to 2 mm relative to the width of the capacitor housing (1).

7. The method of claim 2, wherein In step 3, both the first welding fixture (5) and the second welding fixture (6) are rectangular frame structures. Each of the four corners of the first welding fixture (5) and the second welding fixture (6) has through holes. The four through holes of the first welding fixture (5) correspond to the second round holes (22) on the surface of the four hanging brackets (2). The four through holes of the second welding fixture (6) correspond to the first round holes (21) on the surface of the two hanging brackets (2) on the same left or right side.

8. The method of claim 7, wherein, The bolt passes through the corresponding first round hole (21) and the through hole or the second round hole (22) and the through hole and is then locked by the nut, which is used to fix the first welding fixture (5) or the second welding fixture (6) to the lifting rod (2).

9. The method of claim 1, wherein, In step 4, the capacitor housing (1) after the first welding fixture (5) and the second welding fixture (6) are installed is transferred to the welding workbench of the welding robot. The robotic arm of the welding robot clamps and fixes the first welding fixture (5) and the second welding fixture (6). The welding robot flips the capacitor housing (1) and welds the connection between the capacitor housing (1) and the lifting rod (2) and the connection between the lifting rod (2) and the nut (3).

10. The method of claim 9, wherein, After step 4, the capacitor housing (1) is inspected and processed. The inspection and processing steps include surface treatment and thread inspection.

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