A kind of upper winding tension control system and casting machine for multilayer ceramic capacitor manufacturing

Abstract

The utility model belongs to the technical field of special equipment for ceramic capacitor manufacturing, specifically relates to a winding tension control system and a casting machine for multilayer ceramic capacitor manufacturing. The winding tension control system comprises a feeding roller shaft, a rotating part rotatable around its central shaft and coaxially fixedly connected with the feeding roller shaft, an adjusting belt provided along the outer edge of the rotating part and having a fixed end and a movable end, and a driving part connected to the movable end of the adjusting belt for providing a pushing and pulling force. The wrapping angle of the adjusting belt on the rotating part is less than 360 degrees. The rotating part can rotate synchronously with the feeding roller shaft. The driving part can generate a pushing and pulling force to change the tightness of the adjusting belt on the rotating part, thereby adjusting the rotating speed of the feeding roller shaft to make the tightness of the carrier film appropriate, and the carrier film tightness adjustment can be completed more quickly and conveniently. The casting machine for multilayer ceramic capacitor manufacturing comprises the aforementioned winding tension control system.

Description

Technical Field

[0001] This utility model belongs to the technical field of special equipment for ceramic capacitor manufacturing, specifically relating to an upper winding tension control system and a casting machine for manufacturing multilayer ceramic capacitors. Background Technology

[0002] Multilayer ceramic capacitors (MLCCs), also known as surface mount capacitors, are manufactured by applying ceramic slurry onto a carrier film (PET film) through the injection port of a casting machine. After drying, a ceramic film with a certain thickness, strength, and uniform density is formed. The carrier film is usually rolled up and mounted on the feed rollers of the feeding unit of the drying equipment. As the carrier film moves, the roll is pulled and unwound. The stability of the winding tension is crucial to the thickness uniformity, surface quality, and crack-free nature of the ceramic green belt.

[0003] Traditional magnetic powder clutches / brakes are used to control the winding tension in MLCC casting machines. Their high cost mainly stems from the expensive equipment itself, the cost of magnetic powder consumption and replacement, high maintenance frequency, and high energy consumption. Their poor stability is rooted in the inherent instability of magnetic powder materials (aging, temperature sensitivity), slow response speed, limited control precision, poor adaptability to changes in roll diameter and process disturbances, easy overheating, and the failure risk caused by system complexity.

[0004] Therefore, it is necessary to provide a new winding tension control system. Utility Model Content

[0005] The purpose of this invention is to provide an upper winding tension control system that can easily change the rotation speed of the feed roller shaft and adjust the unwinding speed of the carrier film, so that the tension of the carrier film is appropriate. Accordingly, this invention provides a casting machine for manufacturing multilayer ceramic capacitors that utilizes the aforementioned upper winding tension control system.

[0006] In a first aspect, the present invention provides a carrier film tension adjustment structure, which adopts the following technical solution:

[0007] A winding tension control system includes a feed roller shaft, and further includes:

[0008] A rotating component, which can rotate around its own central axis and is fixedly connected to the feed roller shaft coaxially;

[0009] An adjusting belt has a fixed end and a movable end; the adjusting belt is arranged to wrap around the outer edge of the rotating component, and the wrapping angle on the rotating component is less than 360°;

[0010] And a drive component for providing a push-pull force, the drive component being connected to the movable end of the adjustment belt.

[0011] By adopting the above scheme, the rotating component can rotate synchronously with the feed roller shaft. The drive component generates push-pull force, which changes the tightness of the adjusting belt around the rotating component, thus altering the rotational speed of the feed roller shaft. This allows for appropriate film tension adjustment, enabling quick and convenient adjustment without the risk of jamming. Furthermore, sensors and controllers (such as a PLC) can be added to form an automated control system, dynamically adjusting the film tension based on its real-time operating status. To facilitate installation and obtain sufficient friction to limit the rotational speed of the rotating component, the wrapping angle of the adjusting belt on the rotating component is less than 360°; the wrapping angle is preferably 90°–270°; more preferably 120°–240°.

[0012] Furthermore, the drive component can be fixed, meaning the wrapping angle is constant, and the wrapping tightness is adjusted only by the magnitude of the pulling force generated by the drive component, thereby controlling the rotational speed of the rotating component. In other embodiments, the drive component can also be movable, configured to change position around the central axis of the rotating component. That is, while adjusting the magnitude of the pulling force, the wrapping angle of the adjustment belt on the rotating component can be increased or decreased (the larger the wrapping angle, the greater the frictional resistance), thereby controlling the wrapping tightness; alternatively, the fixed end of the adjustment belt can be fixedly connected to a movable mounting mechanism, and by changing the position of the fixed end, the wrapping angle can also be increased or decreased, achieving control of the wrapping tightness.

[0013] Furthermore, the rotating component can be a roller or a shaft, depending on factors such as the size of the installation space.

[0014] Furthermore, the rotating component is a plastic roller. Plastic rollers are durable and have greater friction with the adjusting belt compared to metal rollers, making them less prone to slippage.

[0015] Furthermore, the adjusting belt is a metal belt. It has high strength and minimal plastic deformation due to frictional heat during operation, which facilitates precise control of the tension of the carrier film.

[0016] Furthermore, the fixed end and the movable end of the adjusting belt are parallel, meaning the wrapping angle of the adjusting belt on the rotating component is 180°. In this state, the tension directions of the fixed and movable ends of the adjusting belt are opposite, and the adjusting belt remains in close contact with and wraps around the periphery of the rotating component, making it difficult to detach.

[0017] Furthermore, the movable end of the adjusting belt has a mounting hole; a mounting pin passes through the mounting hole and is fixed to the frame and perpendicular to the central axis of the rotating component; when replacing the adjusting belt, simply insert the mounting pin into the mounting hole at the end of the adjusting belt, which is a simple operation.

[0018] Furthermore, the mounting pin is tilted towards the side away from the rotating part and relative to the movable end of the adjusting belt; while retaining the simple operation advantage of the mounting hole and mounting pin matching assembly, the tilted mounting pin makes it less likely to detach from the mounting pin when the tension on the adjusting belt increases, thus increasing the installation reliability of the fixed end of the adjusting belt.

[0019] Furthermore, it also includes a mounting bracket with a through hole having a non-circular cross-section; a movable rod is inserted into the through hole, the cross-sectional shape of the movable rod matching the cross-sectional shape of the through hole; one end of the movable rod is fixedly connected to the movable end of the adjusting belt, and the other end is connected to the driving end of the driving component. The through hole can restrict the movement direction of the movable rod, so that a pulling force is applied to the adjusting belt only in a specific direction, allowing the adjusting action to respond quickly.

[0020] Furthermore, the driving component is a linear motor, a pneumatic cylinder, or a hydraulic cylinder.

[0021] Furthermore, it also includes a photoelectric speed sensor for detecting the rotational speed of the feed roller shaft and a programmable logic controller (PLC) connected to the photoelectric speed sensor. The PLC is connected to the drive unit. The photoelectric speed sensor can detect changes in the rotational speed of the feed roller shaft in real time and output the data to the PLC. The PLC controls the magnitude of the pulling force output by the drive unit based on the detection results, thereby enabling real-time dynamic adjustment of the tension of the carrier film.

[0022] Secondly, the present invention provides a casting machine for manufacturing multilayer ceramic capacitors, including a carrier film feeding unit; the carrier film feeding unit includes the aforementioned upper winding tension control system. During operation, the carrier film roll is sleeved on the feeding roller shaft. As the carrier film runs, the feeding roller shaft rotates voluntarily. During this process, as the carrier film unwinds, the roll diameter decreases, and a pushing and pulling force is generated by a driving component, causing the adjusting belt to adhere to and wrap around the outer edge of the rotating component. The friction between the two limits the rotational speed of the rotating component, thereby controlling the rotational speed of the feeding roller shaft and adjusting the carrier film tension. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the upper winding tension control system in Embodiment 1 of this utility model. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the upper winding tension control system in Embodiment 1 of this utility model. Figure 2 ;

[0025] Figure 3 for Figure 2 Enlarged view of section A;

[0026] Figure 4This is a schematic diagram of the upper winding tension control system in Embodiment 1 of this utility model. Figure 3 ;

[0027] Figure 5 This is a schematic diagram of the automatic control system in Embodiment 1 of this utility model;

[0028] Figure 6 This is a schematic diagram of the casting machine used for manufacturing multilayer ceramic capacitors in an application example of this utility model;

[0029] Figure 7 This is a schematic diagram of the upper winding tension control system in Embodiment 3 of this utility model;

[0030] Figure 8 for Figure 7 Enlarged view of section B;

[0031] Figure 9 This is a cross-sectional view of the first mounting frame of the upper winding tension control system in Embodiment 3 of this utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Frame; 11. Carrier film feeding unit; 12. Casting unit; 13. Drying unit; 14. Rewinding unit; 2. Feeding roller shaft; 3. Vertical plate; 4. Rotating component; 5. Adjusting belt; 51. Fixed end; 511. Mounting hole; 52. Movable end; 6. Drive component; 7. First mounting frame; 71. Mounting pin; 72. Through hole; 73. Limiting baffle; 74. Slide rail; 75. Slider; 751. First connecting plate; 752. Second connecting plate; 76. Slide groove; 761. Locking block; 762. Locking bolt; 8. Movable rod; 81. Connecting block; 82. Connecting rod; 83. Limiting ring; 9. Second mounting frame; α. Carrier film. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of this utility model, the present application will be further described in detail below with reference to the accompanying drawings.

[0035] [Example 1]

[0036] A winding tension control system, referring to Figure 1 and Figure 2 This includes a feed roller shaft 2 mounted on the frame 1 of the casting machine for manufacturing multilayer ceramic capacitors. The feed roller shaft 2 is a driven shaft used to feed the unwound carrier film α. In the process of manufacturing multilayer ceramic capacitors, the ceramic slurry is cast onto the unwound carrier film α, dried, and a ceramic film is formed.

[0037] Reference Figure 1 and Figure 2The frame 1 includes a vertical plate 3, to which one end of a feed roller shaft 2 is rotatably mounted. A plastic roller 4, serving as a rotating component, is coaxially fixed at the end of the feed roller shaft 2. The plastic roller is made of polytetrafluoroethylene (PTFE). The plastic roller and the main body of the feed roller shaft 2 are located on opposite sides of the vertical plate 3. All other components of the upper winding tension control system are located on the same side of the vertical plate 3 as the plastic roller.

[0038] Reference Figure 3 and Figure 4 A metal adjustment band 5 is wrapped around the outer edge of the plastic roller. One end of the adjustment band 5 is a fixed end 51, and the other end is a movable end 52. In this embodiment, the wrapping angle of the adjustment band 5 on the plastic roller is 180°, and the fixed end 51 and the movable end 52 are parallel to each other and are both horizontal.

[0039] Reference Figure 3 and Figure 4 A first mounting bracket 7 is fixedly mounted on the upright plate 3 of the frame 1. The first mounting bracket 7 includes a main body fixed to the frame 1 and protruding parts located at both ends of the main body, with the two protruding parts distributed one above the other. A cylindrical mounting pin 71 is fixedly mounted on the lower protruding part of the first mounting bracket 7. The fixed end 51 of the adjusting belt 5 has a mounting hole 511, through which the mounting pin 71 passes. To prevent the adjusting belt 5 from detaching from the mounting pin 71, in this embodiment, the mounting pin 71 is inclined relative to the fixed end 51, with the top of the mounting pin 71 inclined away from the plastic roller. Preferably, the acute angle between the mounting pin 71 and the fixed end 51 is ≤45°.

[0040] Reference Figure 3 and Figure 4 A through hole 72 is formed on the upper protruding portion of the first mounting bracket 7. The cross-section of the through hole 72 is non-circular; in this embodiment, the cross-section of the through hole 72 is rectangular. A movable rod 8 is inserted through the through hole 72, and the cross-section of the movable rod 8 is adapted to the shape of the through hole 72. The movable rod 8 is arranged parallel to the movable end 52 and the fixed end 51. A connecting block 81 is fixedly connected to the end of the movable rod 8 facing the plastic roller, and the bottom surface of the connecting block 81 fits against the movable end 52 and is fixedly connected by bolts.

[0041] Reference Figure 3 and Figure 4 An L-shaped limiting baffle 73 is fixedly connected to the upper protruding part of the first mounting bracket 7 by bolts. The bent part of the limiting baffle 73 is parallel to the end face of the connecting block 81, which is used to limit the range of movement of the connecting block 81 along the length of the movable rod 8.

[0042] Reference Figure 3 and Figure 4A second mounting bracket 9 is fixedly mounted on the upright plate 3 of the frame 1, and the second mounting bracket 9 is spaced apart from the first mounting bracket 7. A cylindrical connecting rod 82 is fixedly connected to the end of the movable rod 8 away from the connecting block 81. The end of the connecting rod 82 away from the first mounting bracket 7 passes through the second mounting bracket 9 and can move relative to the second mounting bracket 9. Two limiting rings 83 are fixedly mounted on the connecting rod 82, and the two limiting rings 83 are respectively located on both sides of the second mounting bracket 9 and spaced apart from the second mounting bracket 9.

[0043] Reference Figure 2 , Figure 3 and Figure 4 The upper winding tension control system also includes a drive component 6 for providing push-pull power. The drive component 6 can be a linear motor, hydraulic cylinder, or pneumatic cylinder, etc. In this embodiment, the drive component 6 is a linear motor, which is fixedly mounted on the frame 1 via a mounting platform, located above and parallel to the connecting rod 82. The drive end of the drive component 6 faces away from the plastic roller. The end of the connecting rod 82 is connected to the drive end of the drive component 6 via a connecting component. When the drive component 6 generates thrust, through the transmission of the connecting component, connecting rod 82, movable rod 8, and connecting block 81, it can pull the adjusting belt 5 to tighten, increasing the friction between it and the plastic roller, thereby reducing the rotational speed of the plastic roller and the feeding roller shaft 2, thus tightening the carrier film α; conversely, it helps to reduce the tightness of the carrier film α.

[0044] The working principle of this embodiment is as follows: Based on the unwinding requirements of the carrier film α, the driving component 6 generates pushing and pulling force to change the tension of the adjusting belt 5, thereby changing the rotational speed of the plastic roller, thus achieving control of the rotational speed of the feeding roller shaft 2 and adjusting the tension of the carrier film α. The overall structure of the upper winding tension control system is simple, easy to assemble and disassemble, and more convenient to operate than conventional manual adjustment methods.

[0045] [Example 2]

[0046] Example 2 is based on Example 1, but the difference is that the tightness of the carrier film α can be adaptively adjusted.

[0047] Reference Figure 5 The upper winding tension control system also includes a photoelectric speed sensor for detecting the rotational speed of the feed roller shaft 2 and a programmable logic controller (PLC) connected to the photoelectric speed sensor. The PLC is connected to the drive component 6. The photoelectric speed sensor can detect changes in the rotational speed of the feed roller shaft 2 in real time and output the results to the PLC. The PLC controls the magnitude of the pulling force output by the drive component 6 based on the detection results, thereby enabling real-time dynamic adjustment of the tension of the carrier film α.

[0048] [Application Example 1]

[0049] A casting machine for manufacturing multilayer ceramic capacitors, as described above. Figure 6 It includes a carrier film feeding unit 11, a casting unit 12, a drying unit 13, and a winding unit 14 arranged sequentially along the running direction of the carrier film α. The carrier film feeding unit 11 is equipped with the winding tension control system of Embodiment 2. Its working principle is as follows: after the carrier film α is unwound from the roll set on the feeding roller shaft 2, it is guided by a guide component and sequentially enters the casting unit 12 and the drying unit 13, and finally is wound up in the winding unit 14. In the casting unit 12, ceramic slurry is coated onto the surface of the carrier film α through the casting die, spreading it to form a ceramic slurry layer; subsequently, in the drying unit 13, the ceramic slurry layer is dried to form a ceramic film. During this process, the winding tension control system can detect the rotation speed of the feeding roller shaft 2 in real time according to the unwinding state of the roll and dynamically adjust it accordingly, so that the carrier film α runs at a suitable speed and tension.

[0050] [Example 3]

[0051] Example 3 is based on Example 2, with the following differences:

[0052] Reference Figure 7 , Figure 8 and Figure 9 The first mounting frame 7 includes a horizontal portion arranged parallel to the axis of the feed roller shaft 2 and a vertical portion arranged perpendicular to the axis of the feed roller shaft 2. The two portions are perpendicular to each other, and the vertical portion is fixed to the frame 1. Adjacent sides of the vertical portion are respectively provided with a slide rail 74 and a slide groove 76, both arranged along the length of the vertical portion. A slider 75 is slidably mounted on the slide rail 74, and a first connecting plate 751 is fixedly connected to the top surface of the slider 75. The first connecting plate 751 is parallel to the fixed end 51. A mounting pin 71 for mounting the adjusting belt 5 is fixedly mounted on the first connecting plate 751. A second connecting plate 752 is fixedly mounted on the side of the slider 75. A locking block 761 is slidably mounted in the slide groove 76, and a locking bolt 762 is inserted into the second connecting plate 752. The end of the locking bolt 762 is inserted into the slide groove 76 and rotatably connected to the locking block 761. Rotating the locking bolt 762 adjusts the tightness between the locking block 761 and the groove wall 76, thus locking or unlocking the position of the slider 75. After unlocking, the slider 75 can slide along the slide rail 74 to change its position, altering the amount of rubber wrapping the adjusting band 5 on the plastic roller. Once adjusted, the position of the slider 75 can be locked using the locking bolt 762 and the locking block 761. Increasing the wrapping angle of the adjusting band 5 on the plastic roller increases friction, making it easier to tighten the carrier film α.

[0053] [Application Example 2]

[0054] Application Example 2 is based on Application Example 1, except that the carrier film feeding unit 11 is equipped with the winding tension control system of Example 3.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A take-up tension control system comprising a supply roll (2), characterized in that, Also includes: Rotating component (4), which can rotate around its own central axis and is coaxially fixedly connected to the feeding roller shaft (2); Adjustment belt (5), the adjustment belt (5) has a fixed end (51) and a movable end (52); the adjustment belt (5) is arranged to wrap around the outer edge of the rotating member (4), and the wrapping angle on the rotating member (4) is less than 360°; And a drive component (6) for providing push-pull force, the drive component (6) being connected to the movable end (52) of the adjusting belt (5).

2. The system of claim 1, wherein: The rotating component (4) is a roller or a roller shaft.

3. A roll-up tension control system according to claim 2, characterized in that: The rotating component (4) is a plastic roller.

4. The system of claim 1, wherein: The adjustment belt (5) is a metal belt.

5. A roll-up tension control system according to claim 4, characterized in that: The fixed end (51) and the movable end (52) of the adjustment belt (5) are parallel, that is, the wrapping angle of the adjustment belt (5) on the rotating part (4) is 180°.

6. A roll-up tension control system according to claim 5, characterized in that: The movable end (52) of the adjustment belt (5) has a mounting hole (511); a mounting pin (71) is inserted into the mounting hole (511), and the mounting pin (71) is fixed to the frame (1) and perpendicular to the central axis of the rotating part (4).

7. A roll-up tension control system according to claim 6, characterized in that: The mounting pin (71) is tilted toward the side away from the rotating part (4) and relative to the movable end (52) of the adjusting belt (5).

8. A roll-up tension control system according to any one of claims 4-7, characterized in that: It also includes a mounting bracket with a through hole (72) having a non-circular cross-section; a movable rod (8) is inserted into the through hole (72), the cross-sectional shape of the movable rod (8) being adapted to the cross-sectional shape of the through hole (72); one end of the movable rod (8) is fixedly connected to the movable end (52) of the adjusting belt (5), and the other end is connected to the driving end of the driving component (6).

9. The system of claim 1, wherein: The driving component (6) is a linear motor, a pneumatic cylinder, or a hydraulic cylinder.

10. A casting machine for manufacturing a multilayer ceramic capacitor, comprising a carrier film supply unit (11), characterized in that: The carrier film feeding unit (11) includes the roll tension control system as described in any one of claims 1-9.

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