Drilling-free capacitor core rod and manufacturing process

Abstract

The invention discloses a drilling-free capacitor core rod and a manufacturing process, the drilling-free capacitor core rod comprises a core rod with a hollow cavity, the hollow cavity is of a regular hexagon structure, and a sealing partition plate is arranged in the hollow cavity of the core rod and used for sealing and partitioning the hollow cavity of the core rod. Comprising the following steps that S1, a hollow cavity is polished, specifically, the inner wall of the hollow cavity of a core rod is polished through a polishing tool, and an annular polishing area is formed; and S2, injection molding treatment of the sealing partition plate: injecting a plastic fluid in a molten state into the annular polishing area of the inner cavity of the core rod by utilizing injection molding equipment, and cooling and curing to form the sealing partition plate. The sealing partition plate is arranged in the hollow core rod, the hollow cavity of the core rod can be sealed and partitioned, and after the sealing partition plate is additionally arranged, conduction cannot be formed in the core rod during metal spraying, so that drilling treatment does not need to be carried out in the follow-up process, scraped products are prevented from being generated during drilling, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of capacitor manufacturing technology, and in particular to a drill-free capacitor core and its manufacturing process. Background Technology

[0002] The manufacturing process of cylindrical film capacitor core is as follows: winding → gold spraying → polymerization → decoupling → drilling → energizing → semi-finished product testing. The drilling process is to remove the gold spraying metal particles that are thickly attached to the inner wall of the core rod (the cavity of which is a regular hexagonal structure) during gold spraying, so as to achieve the effect of insulation between the two poles of the capacitor.

[0003] Drilling is typically done using electric or pneumatic drills. Since the core rod of a wound film capacitor is held in a clamp during drilling, if the clamp shifts during use, the high-speed rotating drill bit can damage the end face of the capacitor core rod, rendering the entire wound film capacitor core rod unusable (increasing production costs). Furthermore, when the capacitor core rod length is less than 40mm, or the core end face diameter is less than 25mm, the drilling clamp cannot effectively hold the core, causing the core to rotate with the drill bit, damaging the outer encapsulation of the capacitor core rod. Ultimately, this results in a low capacitor drilling pass rate and increased production costs. Therefore, this application provides a drill-free capacitor core rod and its manufacturing process to meet this need. Summary of the Invention

[0004] The purpose of this application is to provide a drill-free capacitor core rod and manufacturing process to solve the technical problems of existing technologies that, when drilling is used, the entire film capacitor core rod wrapped with the core rod is scrapped, the drilling pass rate is low, and ultimately the production cost is increased.

[0005] To achieve the above objectives, this application provides the following technical solution: a drill-free capacitor core rod, comprising a core rod with a hollow cavity, wherein the hollow cavity is configured as a regular hexagonal structure, and a sealing partition is provided inside the hollow cavity of the core rod for sealing and isolating the hollow cavity of the core rod.

[0006] A manufacturing process for a drill-free capacitor core includes the following steps:

[0007] S1. Hollow cavity grinding treatment: Use grinding tools to grind the inner wall of the hollow cavity of the mandrel to form a ring-shaped grinding area;

[0008] S2. Sealing partition injection molding process: Molten plastic fluid is injected into the annular grinding area of ​​the inner cavity of the mandrel using injection molding equipment, and then cooled and solidified to form a sealing partition.

[0009] As a preferred embodiment of this invention, the injection molding equipment includes a chain conveyor, a longitudinal electric slide rail with an injection gun installed, multiple cooling fans arranged in rows on the frame of the chain conveyor, and a support platform for carrying the mandrel.

[0010] The bearing platform is provided in multiple sets and is equally spaced on the chain plate of the chain conveyor. The bearing platform includes a mounting plate fixedly installed on the chain plate, a base plate with a limit post rotatably installed at the upper end, and a large gear, a small gear ring, and a gear plate that cooperate with each other.

[0011] The upper end of the mounting plate is provided with two sets of through columns, and the upper ends of the two sets of through columns slide through the bottom plate and are fixedly connected to the first baffle.

[0012] The limiting post is configured as a regular hexagonal structure adapted to the hollow cavity of the core rod, the lower end of the limiting post is rotatably mounted on the base plate, and a second baffle is fixedly sleeved on the limiting post;

[0013] The small toothed ring is fixedly sleeved on the limiting post and located below the second baffle. The small toothed ring meshes with the large gear, and the large gear is rotatably mounted on the base plate.

[0014] The toothed plate is mounted on the frame of the chain conveyor and is located on the movement path of the large gear;

[0015] The diameter of the injection gun barrel of the injection gun is smaller than the size of the hollow cavity of the mandrel;

[0016] The longitudinal electric slide rail is installed on the chain conveyor, and the longitudinal electric slide rail, the chain conveyor, the injection gun, and the cooling fan are all electrically connected to the PLC controller;

[0017] When the mandrel is inserted into the limiting post and the second baffle provides support for the bottom of the mandrel, the insertion end face of the mandrel is located at the lower edge of the annular grinding area inside the mandrel.

[0018] As a preferred embodiment of this invention, an automatic oiling unit is also provided to control the individual support platform to apply release oil to the insertion end of the limiting post before carrying the mandrel.

[0019] As a preferred embodiment of this invention, the automatic oiling unit includes two sets of contact rods disposed opposite to each other on both sides of the base plate and two sets of guide plates fixedly disposed at the bottom of the chain conveyor frame.

[0020] The lower ends of the two sets of guide plates are connected to a storage box containing release agent via connecting rods;

[0021] The guide plate is provided with an upper inclined surface, an inverted trapezoidal surface, a stepped surface, a horizontal surface, and a lower inclined surface in sequence from left to right;

[0022] The height of the top of the right slope of the inverted trapezoidal surface is higher than the height of the top of the left slope of the inverted trapezoidal surface;

[0023] Both the stepped surface and the horizontal surface are located above the top of the left sloping surface of the inverted trapezoidal surface.

[0024] As a preferred embodiment of this invention, a magnetic auxiliary unit is also provided to assist the mandrel in detaching from the limiting post.

[0025] As a preferred embodiment of this invention, the magnetic auxiliary unit includes a permanent magnet and two sets of magnetic rings;

[0026] The permanent magnet is disposed in a groove at the center of the mounting plate.

[0027] The two sets of magnetic rings are respectively disposed in the annular grooves on the corresponding first baffle.

[0028] As a preferred embodiment of this invention, a stabilizing unit is also provided to prevent the mandrel from moving up and down when it is rotating rapidly.

[0029] In a preferred embodiment of this invention, the stabilizing unit includes two sets of plates arranged opposite to each other and mounted on the chain conveyor frame. Multiple sets of mounting shafts are rotatably arranged in a straight line on the two sets of plates. Each mounting shaft is equipped with a pulley, and the multiple sets of pulleys arranged in a row are assembled with the extrusion belt.

[0030] In summary, the technical effects and advantages of this invention are as follows:

[0031] 1. The present invention has a reasonable structure. A sealing partition is set inside the hollow core rod, which can seal and isolate the hollow cavity of the core rod. After adding the sealing partition, it is impossible to form a conduction inside the core rod during gold spraying. Therefore, in subsequent processes, there is no need to perform drilling, thereby avoiding the generation of scrap products during drilling and reducing production costs.

[0032] 2. In this invention, the injection molding equipment can perform plastic fluid injection in the annular grinding area inside the mandrel, and spread the plastic fluid by centrifugal force. After solidification, it forms a sealing partition for barrier, and automatically completes the unloading operation.

[0033] 3. In this invention, an automatic oiling unit is also provided to automatically control a single support platform to apply release oil to the insertion end of the limiting post 8 before carrying the mandrel.

[0034] 4. In this invention, a magnetic auxiliary unit is also provided to assist the mandrel in detaching from the limiting post; at the same time, when the mandrel is injection molded, its base plate is magnetically fixed to the mounting plate by a permanent magnet, which can effectively prevent the base plate from vibrating greatly when the chain conveyor moves and the limiting post rotates. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0037] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;

[0038] Figure 3 for Figure 2 Schematic diagram of the central support platform structure;

[0039] Figure 4 for Figure 3 Schematic diagram of the exploded structure of the central support platform;

[0040] Figure 5 for Figure 4 A schematic diagram of the mounting plate from below;

[0041] Figure 6 for Figure 1 Schematic diagram showing the interaction between the central support platform and the automatic oiling unit;

[0042] Figure 7 for Figure 6 A schematic diagram of the structure viewed from the center.

[0043] In the diagram: 1. Longitudinal electric slide rail; 2. Injection gun; 3. Chain conveyor; 4. Cooling fan; 5. Mounting plate; 6. Through column; 7. First baffle; 8. Limiting column; 9. Second baffle; 10. Small gear ring; 11. Large gear; 12. Gear plate; 13. Base plate; 14. Permanent magnet; 15. Magnetic ring; 16. Guide plate; 17. Storage box; 18. Upper guide slope; 19. Inverted trapezoidal surface; 20. Stepped surface; 21. Horizontal surface; 22. Lower guide slope; 23. Plate; 24. Mounting shaft; 25. Extrusion belt; 26. Contact rod. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example: A drill-free capacitor core rod includes a core rod with a hollow cavity. The hollow cavity is configured as a regular hexagonal structure. A sealing partition is provided inside the hollow cavity of the core rod to seal and isolate the hollow cavity of the core rod.

[0046] A sealing partition is installed inside the hollow mandrel to seal and isolate the hollow cavity of the mandrel. After adding the sealing partition, it is impossible to form a conductor inside the mandrel during gold spraying. Therefore, there is no need to perform drilling in subsequent processes, thereby avoiding the generation of scrap products during drilling and reducing production costs.

[0047] A manufacturing process for a drill-free capacitor core includes the following steps:

[0048] S1. Hollow cavity grinding treatment: Use grinding tools to grind the inner wall of the hollow cavity of the mandrel to form a ring-shaped grinding area;

[0049] S2. Sealing partition injection molding process: Molten plastic fluid is injected into the annular grinding area of ​​the inner cavity of the mandrel using injection molding equipment, and then cooled and solidified to form a sealing partition.

[0050] First, the inner wall of the hollow cavity of the core rod is polished to increase the bonding force between the sealing partition formed after subsequent curing and the core rod, so as to avoid the partition falling off and the seal failing due to insufficient bonding force, thereby ensuring the reliability of insulation between the two poles of the capacitor.

[0051] As a preferred embodiment of this example, Figure 1-4 As shown, the injection molding equipment includes a chain conveyor 3, a longitudinal electric slide rail 1 on which the injection gun 2 is installed, multiple cooling fans 4 arranged in rows on the frame of the chain conveyor 3, and a support platform for carrying the mandrel.

[0052] Multiple sets of bearing platforms are set at equal intervals on the chain plate of the chain conveyor 3. The bearing platform includes a mounting plate 5 fixedly set on the chain plate, a base plate 13 with a limit post 8 rotatably set at the upper end, and a large gear 11, a small gear ring 10, and a gear plate 12 that cooperate with each other.

[0053] Two sets of through posts 6 are provided opposite to each other on the upper end of the mounting plate 5, and the upper ends of the two sets of through posts 6 slide through the bottom plate 13 and are fixedly connected to the first baffle 7.

[0054] The limiting post 8 is configured as a regular hexagonal structure that fits the hollow cavity of the core rod. The lower end of the limiting post 8 is rotatably mounted on the base plate 13. A second baffle 9 is fixedly sleeved on the limiting post 8.

[0055] The small toothed ring 10 is fixedly sleeved on the limiting post 8 and located below the second baffle 9. The small toothed ring 10 is meshed with the large gear 11, and the large gear 11 is rotatably mounted on the base plate 13.

[0056] The toothed plate 12 is mounted on the frame of the chain conveyor 3, and the toothed plate 12 is located on the movement path of the large gear 11;

[0057] The diameter of the injection gun barrel of injection gun 2 is smaller than the size of the hollow cavity of the mandrel;

[0058] The longitudinal electric slide rail 1 is installed on the chain conveyor 3. The longitudinal electric slide rail 1, the chain conveyor 3, the injection gun 2, and the cooling fan 4 are all electrically connected to the PLC controller.

[0059] When the mandrel is inserted into the limiting post 8 and the second baffle 9 provides support for the bottom of the mandrel, the insertion end face of the mandrel is located at the lower edge of the annular grinding area inside the mandrel.

[0060] During operation, the mandrel is inserted into the limiting post 8 located directly below the injection gun 3, with the second baffle 9 at the bottom of the mandrel in contact. Then, the start switch on the chain conveyor 3 (electrically connected to the PLC controller) is manually pressed, causing the injection gun 2 to move downwards. The barrel of the injection gun 2 is inserted into the annular grinding area inside the mandrel cavity for injection. The plastic fluid accumulates at the axis at the upper end of the limiting post 8. After injection, the injection gun 2 returns to its original position, and the chain conveyor 3 starts working, driving the chain plate to move. During the movement, the large gear 11 will mesh with the toothed plate 12 and drive the large gear 11 to rotate. Because the large gear 11 meshes with the small gear... Ring 10 is toothed and can drive the limiting post 8 and the mandrel to rotate rapidly. When the limiting post 8 rotates rapidly, the plastic fluid accumulated at its upper end moves outward and spreads outward by centrifugal force (in this process and in the subsequent process, the cooling fan 4 quickly dissipates heat from the annular grinding area of ​​the mandrel, quickly dissipates heat from the internal molten fluid and solidifies it), and forms a sealing partition in the annular grinding area. After the plastic fluid is completely spread out, the chain conveyor 3 stops moving. At this time, the next set of limiting posts 8 moves to the bottom of the injection gun 2. At this time, the operator places the mandrel and then presses the start switch to perform the injection operation. This process is repeated.

[0061] During the intermittent movement of the chain conveyor 3, the limiting post 8 will rotate downward. During the rotation, the mandrel will move downward and separate from the limiting post 8 due to gravity, eventually falling into the receiving trough placed below.

[0062] When the mandrel cannot detach from the limiting post 8 by its own weight, since the base plate 13 and the mounting plate 5 adopt a split design, during the downward rotation of the limiting post 8, the base plate 13 will drive the limiting post 8 to move downward relative to the mounting plate 5, and eventually cause the base plate 13 to collide with the first baffle 7. Through this collision and the gravity of the mandrel itself, the mandrel is shaken off the limiting post 8 and falls into the receiving groove, further promoting the separation of the mandrel from the limiting post 8.

[0063] This injection molding equipment can inject plastic fluid into the annular grinding area inside the mandrel, and spread the plastic fluid through centrifugal force. After solidification, it forms a sealing partition for barrier, and automatically completes the material unloading operation.

[0064] It is important to note the following: First, the length of the toothed plate 12 can be appropriately extended or covered to cover the entire heat dissipation area as needed. This allows the mandrel to rotate during the movement of the chain conveyor 3 and the limiting post 8, thus dissipating heat more evenly. Second, during injection molding, the molten plastic accumulates at the upper axis of the limiting post 8 made of metal material. This prevents the fluid from directly contacting the inside of the mandrel (plastic material) and melting at the beginning. Centrifugal force spreads the molten plastic evenly across the annular grinding area, forming a thin and flat fluid layer. Compared to the accumulated state, the heat dissipation area is significantly increased. Combined with a cooling fan to dissipate heat from the mandrel, rapid heat dissipation of the molten plastic is achieved. Third, the sealing partition inside the mandrel is installed before all other processes, making it the initial process. Even if scrap products are generated during grinding or injection molding, the cost of a single scrap product (mandrel only) is low, effectively reducing the overall production cost.

[0065] As a preferred embodiment of this invention, an automatic oiling unit is also provided to control the single support platform to apply release oil to the insertion end of the limiting post 8 before carrying the mandrel.

[0066] Applying release agent to the end of the limiting post 8 facilitates the subsequent removal of the mandrel from the limiting post 8.

[0067] As a preferred embodiment of this example, Figure 1 , Figure 6 and Figure 7 As shown, the automatic oiling unit includes two sets of contact rods 26 arranged opposite to each other on both sides of the base plate 13, and two sets of guide plates 16 fixedly arranged at the bottom of the chain conveyor 3 frame;

[0068] The lower ends of the two sets of guide plates 16 are connected to the storage box 17 containing the release agent via connecting rods;

[0069] The guide plate 16 is provided with an upper inclined surface 18, an inverted trapezoidal surface 19, a stepped surface 20, a horizontal surface 21, and a lower inclined surface 22 connected from left to right;

[0070] The height of the top of the right slope of the inverted trapezoidal surface 19 is higher than the height of the top of the left slope of the inverted trapezoidal surface 19;

[0071] Both the stepped surface 20 and the horizontal surface 21 are located above the top of the left sloping surface of the inverted trapezoidal surface 19.

[0072] When the base plate 13 separates from the mounting plate 5, and the lower end of the limiting post 8 is set downwards, the base plate 13 will move laterally to the right as the chain conveyor 3 runs. The contact rod 26 (which can be rotatably set with the base plate 13) on it contacts the guide inclined surface 18 and moves upwards relative to the mounting plate 5. After moving above the storage box 17, it moves to the inverted trapezoidal surface 19. The base plate 13 will first move downwards, and the lower end of the limiting post 8 will insert into the release agent. After moving laterally a short distance, it will move upwards. At this time, the lower end of the limiting post 8 will remove the release agent, and the limiting post 9 will be located above the storage box 17. The contact rod 26 will then move to the stepped surface 20. 1. When the contact rod 26 moves freely from the upper step to the lower step, it will cause the limiting post 8 to vibrate, thereby shaking off the excess release agent adhering to the end of the limiting post 8 into the storage box 17 (to avoid the release agent dripping onto the ground and causing waste and pollution). It can be shaken off multiple times. During the shaking off process, the lower end of its limiting post 8 is always located directly above the storage box 17. After the shaking off is completed, the contact rod 26 will move laterally a distance on the horizontal plane 21. At this time, the limiting post 8 will move to the right side of the storage box 17. When the contact rod 26 moves on the guide slope 22, its limiting post 8 will move downward and eventually return to its original position.

[0073] This automatic oiling unit can automatically apply release oil to the ends of the limit post 8 and shake off excess release oil.

[0074] As a preferred embodiment of this invention, a magnetic auxiliary unit is also provided to assist the mandrel in detaching from the limiting post 8.

[0075] As a preferred embodiment of this example, Figure 4 and Figure 5 As shown, the magnetic auxiliary unit includes a permanent magnet 14 and two sets of magnetic rings 15;

[0076] The permanent magnet 14 is set in the groove at the axis of the mounting plate 5;

[0077] Two sets of magnetic rings 15 are respectively set in the annular grooves on the corresponding first baffle 7.

[0078] When the mandrel is injection molded, its base plate 13 is magnetically fixed to the mounting plate 5 by the permanent magnet 14, which can effectively prevent the base plate 13 from vibrating when the chain conveyor 3 moves and the limit column 8 rotates (vibration will destroy the stabilizing effect of centrifugal force, causing the plastic fluid to be unbalanced in the annular grinding area (local accumulation, local gaps), and the final sealing partition will have inconsistent thickness, or even gaps, and lose its insulation barrier function).

[0079] When the limiting post 8 rotates downward, the permanent magnet 14 initially hinders the downward movement of the base plate 13. When the lower end of the limiting post 9 is about to rotate to a vertically downward state, the base plate 13 overcomes the magnetic force under the action of gravity and moves downward. In the later part of the fall, the magnetic force between the magnetic ring 15 and the base plate 13 accelerates the downward movement of the base plate 13, increases the collision strength between the base plate 13 and the first baffle 7, and further promotes the separation of the core rod and the limiting post 8.

[0080] It should be noted that the separate design of the mounting plate 5 and the base plate 13, the automatic oiling unit, and the magnetic auxiliary unit can effectively prevent the core rod from being difficult to separate from the limiting post 91.

[0081] As a preferred embodiment of this invention, a stabilizing unit is also provided to prevent the mandrel from moving up and down when it is rotating rapidly.

[0082] The up-and-down movement of the mandrel causes the spread trajectory of the plastic fluid to deviate under the action of centrifugal force, resulting in incomplete sealing of the hollow cavity of the mandrel and the existence of conductive channels in some areas. The up-and-down movement also causes relative displacement between the molten plastic fluid and the polished area on the inner wall of the mandrel, resulting in the fluid not being able to fully fill the rough texture of the polished area, forming gaps or bubbles. After solidification, the partition is easy to fall off, and the sealing function is lost. Therefore, a stabilizing unit is set up.

[0083] As a preferred embodiment of this example, Figure 2 As shown, the stabilizing unit includes two sets of plates 23 that are arranged opposite to each other and mounted on the frame of the chain conveyor 3. Multiple sets of mounting shafts 24 are rotatably arranged in a straight line on the two sets of plates 23. Each mounting shaft 24 is equipped with a pulley. The multiple sets of pulleys arranged in a row are assembled with the extrusion belt 25.

[0084] When the chain conveyor 3 is working, it will drive the injection-molded mandrel to move to the left. The mandrel moves to the left and forms a compression between the two sets of extrusion belts 25. Then, the large gear 11 meshes with the toothed plate 12, driving the limiting post 8 and the mandrel to rotate. The mandrel drives the extrusion belt 25 to move through the friction between it and the extrusion belt 25. The extrusion of the mandrel by the two sets of extrusion belts 25 limits the mandrel and prevents it from moving up and down.

[0085] It should be noted that the length of its compression belt 25 can be set as needed.

[0086] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drill-less capacitor core rod comprising a core rod with a hollow cavity, the hollow cavity is arranged in a regular hexagonal structure, characterized in that: A sealing partition plate is arranged in the hollow cavity of the mandrel to seal the hollow cavity of the mandrel.

2. The process for manufacturing a pinhole-free capacitor rod as claimed in claim 1, wherein: The method comprises the following steps: S1, hollow cavity polishing treatment: using a polishing tool to polish the inner wall of the hollow cavity of the mandrel to form an annular polishing area; S2, sealing partition plate injection molding treatment: using an injection molding device to inject a molten plastic fluid into the annular polishing area of the inner cavity of the mandrel and cool and solidify to form a sealing partition plate.

3. The process for manufacturing a pinhole-free capacitor rod as claimed in claim 1, wherein: The injection molding device comprises a chain conveyor (3), a longitudinal electric sliding rail (1) provided with an injection gun (2), a plurality of groups of cooling fans (4) arranged in a row on the frame of the chain conveyor (3), and a carrying table for carrying the mandrel; The carrying table is provided in multiple groups and is arranged at equal intervals on the chain plate of the chain conveyor (3). The carrying table comprises a mounting plate (5) fixedly arranged on the chain plate, a bottom plate (13) having a limit column (8) rotatably arranged at the upper end, and a large gear (11), a small gear ring (10), and a toothed plate (12) cooperating with each other; The upper end of the mounting plate (5) is oppositely provided with two groups of penetrating columns (6), and the upper ends of the two groups of penetrating columns (6) slide through the bottom plate (13) and are fixedly connected with a first baffle (7); The limit column (8) is arranged in a regular hexagonal structure matching the hollow cavity of the mandrel. The lower end of the limit column (8) is rotatably arranged on the bottom plate (13). A second baffle (9) is fixedly sleeved on the limit column (8); The small gear ring (10) is fixedly sleeved on the limit column (8) and located below the second baffle (9). The small gear ring (10) is in gear connection with the large gear (11). The large gear (11) is rotatably arranged on the bottom plate (13); The toothed plate (12) is mounted on the frame of the chain conveyor (3), and the toothed plate (12) is located on the movement path of the large gear (11); The diameter of the injection gun tube of the injection gun (2) is smaller than the size of the inner cavity of the hollow cavity of the mandrel; The longitudinal electric sliding rail (1) is mounted on the chain conveyor (3). The longitudinal electric sliding rail (1), the chain conveyor (3), the injection gun (2), and the cooling fan (4) are electrically connected with the PLC controller; When the mandrel is inserted into the limit column (8) and the second baffle (9) supports the bottom of the mandrel, the end face of the insertion end of the mandrel is located at the lower edge of the inner annular polishing area of the mandrel.

4. The process for manufacturing a pinhole-free capacitor rod as claimed in claim 3, wherein: An automatic oiling unit is further provided for controlling the insertion end of the limit column (8) to be smeared with a demolding oil agent before the single carrying table carries the mandrel.

5. The process for manufacturing a pinhole-free capacitor rod as claimed in claim 4, wherein: The automatic oiling unit comprises two groups of contact rods (26) oppositely arranged on both sides of the bottom plate (13) and two groups of guide plates (16) fixedly arranged at the bottom of the frame of the chain conveyor (3); The lower ends of the two groups of guide plates (16) are connected with a storage box (17) containing a demolding oil agent through a connecting rod; The automatic oiling unit comprises two groups of contact rods (26) oppositely arranged on both sides of the bottom plate (13) and two groups of guide plates (16) fixedly arranged at the bottom of the frame of the chain conveyor (3); The guide plate (16) is sequentially connected from left to right with an upward guide slope (18), an inverted trapezoidal surface (19), a stepped surface (20), a horizontal surface (21) and a downward guide slope (22); The right slope top of the inverted trapezoidal surface (19) is higher than the left slope top of the inverted trapezoidal surface (19); The stepped surface (20) and the horizontal surface (21) are both above the left slope top of the inverted trapezoidal surface (19).

6. The process for manufacturing a pinhole-free capacitor rod as claimed in claim 5, wherein: A magnetic auxiliary unit is further arranged to assist the core rod to separate from the limiting column (8).

7. The process of claim 6, wherein: The magnetic auxiliary unit comprises a permanent magnet (14) and two groups of magnetic rings (15); The permanent magnet (14) is arranged in a groove at the shaft center of the mounting plate (5); The two groups of magnetic rings (15) are respectively arranged in annular grooves on the first baffle (7).

8. The drill-less capacitor core rod and manufacturing process of claim 3, wherein: A stabilizing unit is further arranged to prevent the core rod from moving up and down when the core rod is rapidly rotating.

9. The drill-less capacitor core rod and manufacturing process of claim 4, wherein: The stabilizing unit comprises two groups of plate bodies (23) oppositely arranged and mounted on the frame of the chain plate conveyor (3), a plurality of groups of mounting shafts (24) are arranged in a linear type on the two groups of plate bodies (23), a belt pulley is mounted on each mounting shaft (24), and a plurality of groups of belt pulleys arranged in a row are assembled with an extruded belt (25).

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