A needle fixing device, a printing machine and a needle fixing method in a printing machine

Abstract

The application provides a top pin fixing device, a printing machine and a top pin fixing method in the printing machine. The top pin fixing device comprises a fixing plate and a limiting piece. The fixing plate is provided with a limiting through hole for placing a top pin. The limiting piece abuts against at least one set of opposite sides of the fixing plate. The device limits the top pin in the limiting through hole of the fixing plate, and then limits the fixing plate by the limiting piece. The double limiting effect ensures the position of the top pin, prevents the position of the top pin from deviating in the printing process, and reduces the defective rate of the PCB printing.

Description

Technical Field

[0001] This invention relates to the technical field of ejector pin fixing in double-sided printing processes, and particularly to an ejector pin fixing device, a printing press, and a method for fixing ejector pins in a printing press. Background Technology

[0002] With the miniaturization of the air conditioning industry, double-sided surface mount technology (SMT) is increasingly used in indoor units of household air conditioners. In the double-sided SMT process, solder paste is first applied to one side of the PCB, then it is flipped over, and red glue is applied to the other side. During the application of the red glue, a pin is needed to support the PCB to counteract the pressure from the scraper.

[0003] In existing technologies, a stop block is used to limit the position of the ejector pin, and the ejector pin is usually magnetically attached to the printing platform. Since the ejector pin is small, if the position of the ejector pin is fixed solely by the magnetic attraction force, the ejector pin and the stop block will shift during the printing process due to the forward friction force of the PCB board. The shifted ejector pin may come into contact with components in the PCB board, causing serious quality problems such as damage to the components in the PCB board, affecting the printing effect of the PCB board and the defect rate of the final product. Summary of the Invention

[0004] To overcome the problems existing in related technologies, one of the objectives of this invention is to provide a pin fixing device that limits the pin in the limiting through hole of the fixing plate and then limits the fixing plate by a limiting member. The double limiting effect ensures that the pin position is fixed, preventing the pin from shifting position during the printing process and reducing the defect rate of PCB printing.

[0005] A pin fixing device includes: a fixing plate and a limiting member, wherein the fixing plate is provided with a limiting through hole for placing a pin; the limiting member is fixed to the side of the fixing plate for limiting the fixing plate.

[0006] In this application, the limiting through hole in the fixing plate can limit the ejector pin. At the same time, the limiting member is fixed to the side of the fixing plate, that is, the limiting member fixes and limits at least one set of opposite sides of the fixing plate. The position of the ejector pin is fixed through double limiting, ensuring that the position of the ejector pin is fixed during the printing process, thereby improving the printing efficiency of the PCB board, avoiding the ejector pin from touching the components in the PCB board, and reducing the defect rate of the printing process.

[0007] In a preferred embodiment of the present invention, the fixing plate is located between two parallel printing support frames, and the limiting member includes at least two opposing blocks, the blocks being located on the inner sidewall of the printing support frame, and the blocks abutting against the fixing plate.

[0008] In this application, the printing support frame serves as a support frame for the PCB board. Simultaneously, it utilizes the internal space of the PCB board to add stoppers. Note that each stopper is a single protruding structure, and the stoppers in the two printing support frames correspond one-to-one. Each set of corresponding stoppers can be used as a set of limiting components, and multiple sets of stoppers achieve the limiting of the same group of opposite sides in the fixed plate. This application uses stoppers fixed in the printing support frame to limit the position of the fixed plate. This fully utilizes the shape and position of the printing support frame, simplifies the structure of the fixing device, reduces the floor space, and lowers costs. Furthermore, it allows for the separation of the printing support frame and the fixed plate through point contact, facilitating the placement and removal of the fixed plate and improving the maintenance and replacement efficiency of the fixed plate.

[0009] In a preferred embodiment of the present invention, the fixing plate is a cuboid, and the limiting component includes a first limiting component and a second limiting component. The first limiting component abuts against the long side of the fixing plate, and the second limiting component abuts against the short side of the fixing plate.

[0010] In a preferred embodiment of the present invention, the first limiting component includes a limiting strip and limiting protrusions fixed on both sides of the limiting strip. The gap between the two limiting strips is equal to the long side dimension of the fixed plate, and the gap between the two limiting protrusions in the same first limiting component is equal to the short side dimension of the fixed plate.

[0011] In this application, since the second limiting component is a stop, the contact area between a single stop and the fixed plate is small. To ensure the fixed plate is fixed in the width direction, limiting protrusions are added to both ends of the limiting strip of the first limiting component. The limiting protrusions on the same side of the fixed plate and the stop abut against the same side edge of the fixed plate. In this way, the limiting protrusions and the stop together limit the position of the fixed plate in the width direction. This application cleverly utilizes the structure of the first limiting component to achieve enhanced limiting of the second limiting component, simultaneously achieving position limiting in two directions using the simplest structure. This not only simplifies the structure of the ejector pin fixing device but also enhances the limiting effect of the limiting component on the fixed plate.

[0012] In a preferred embodiment of the present invention, the limiting strip and the two limiting strips form a U-shaped structure or an I-shaped structure.

[0013] In this application, the first limiting component of the I-shaped structure increases the contact area between the limiting protrusion and the printing support frame, thereby enhancing the frictional fixing force of the printing support frame on the first limiting component and further strengthening the fixing effect of the printing support frame on the first limiting component.

[0014] In a preferred embodiment of the present invention, the fixing plate is located between two parallel printing support frames, and the second limiting component includes at least two opposing blocks. The blocks are located between two limiting protrusions on the same side of the two first limiting components, and the size of the limiting protrusions is equal to the size of the blocks in the direction parallel to the limiting strip.

[0015] In this application, if the size of the limiting protrusion is smaller than the size of the stop block, when the stop block abuts against the fixed plate, the inner side of the limiting protrusion abuts against the fixed plate, but the outer side of the limiting protrusion cannot abut against the printing support frame. The limiting strip can only be fixed to the printing platform by magnetism. Under the action of external force, the magnetism alone may not be sufficient to ensure that the limiting strip remains in place. If the size of the limiting protrusion is larger than the size of the stop block, when the limiting protrusion abuts against the fixed plate, since the other side of the limiting protrusion abuts against the printing support frame, the stop block cannot abut against the fixed plate. As a second limiting component, the stop block cannot limit the width of the fixed plate. Therefore, this application needs to be set in a direction parallel to the limiting strip. In this embodiment, the size of the limiting protrusion is equal to the size of the stop. This ensures that the stop and the limiting protrusion on the same side of the fixing plate abut against the fixing plate on one side and against the printing support frame on the other side. At this time, the printing support frame can serve as both a fixing member for the stop and a fixing member for the first limiting component. Since the position of the printing support frame is fixed, the positions of the first limiting component and the stop are also fixed. That is, the first limiting component and the second limiting component are synchronously fixed by means of the original printing support frame. The fixing efficiency of the ejector pin fixing device is improved by using the simplest and most limited existing device.

[0016] In a preferred embodiment of the present invention, the first limiting component is located in the printing platform, and the first limiting component and the printing platform are respectively magnetically attracted to each other.

[0017] In this application, the first limiting component and the printing platform are respectively magnetically attracted to each other. The first limiting component is fixed in the printing platform by means of the mutual magnetic attraction, so that the position of the first limiting component can be fixed without the need for additional fixing components. This simplifies the structure of the ejector pin fixing device, and at the same time facilitates the position adjustment, maintenance and replacement of the first limiting component and the fixing plate, thereby improving the assembly efficiency of the first limiting component and the fixing plate.

[0018] In a preferred embodiment of the present invention, the fixing plate is located in the printing platform, and the ejector pin and the printing platform are respectively magnetically attracted to each other.

[0019] A second objective of this invention is to provide a printing machine including the ejector pin fixing device described above.

[0020] In this application, the ejector pin and the printing platform are respectively magnetically attracted to each other. When the ejector pin is placed in the limiting through hole, it is fixed in the printing platform by magnetic attraction. At the same time, this application sets the limiting through hole to limit the position of the ejector pin, and the fixing plate is further limited by the limiting component. Through multiple limiting effects, the position of the ejector pin is ultimately ensured to be fixed during the printing process, and its position displacement is avoided.

[0021] The third objective of this invention is to provide a method for fixing ejector pins in a printing press, comprising the following steps:

[0022] Set limit through holes in the fixing plate corresponding to the PCB board;

[0023] A fixing plate is placed between two printing support frames, the printing support frames being relative to the short side dimension of the fixing plate;

[0024] First limiting components are provided on both sides of the fixed plate, and the first limiting components are used to limit the long side of the fixed plate;

[0025] Place the ejector pin in the limiting through hole, place the PCB board on the printing support frame, and perform PCB board printing.

[0026] The beneficial effects of this invention are as follows:

[0027] This invention provides a ejector pin fixing device, including a fixing plate and a limiting member. The fixing plate has a limiting through hole for placing the ejector pin. The limiting member is fixed to the side of the fixing plate and is used to limit the fixing plate. Specifically, the limiting member abuts against at least one set of opposite sides of the fixing plate. The limiting through hole in the fixing plate can limit the ejector pin. At the same time, the limiting member is used to limit at least one set of opposite sides of the fixing plate. That is, the limiting member is used to limit the fixing plate. The position of the ejector pin is fixed through double limiting, ensuring that the position of the ejector pin is fixed during the printing process, thereby improving the printing efficiency of the PCB board, avoiding the ejector pin from touching the components in the PCB board, and reducing the defect rate of the printing process.

[0028] The present invention also provides a printing machine including the above-mentioned ejector pin fixing device. In this application, the ejector pin fixing device is located in the printing platform. With the help of the printing machine's own track and stop, and combined with the limiting component, the fixing plate is fixed, ensuring that the ejector pin position is fixed during the printing process, thereby improving the printing efficiency of the printing machine and reducing the defect rate of the printing process.

[0029] This invention also provides a method for fixing ejector pins in the aforementioned printing press. First, a limiting through-hole corresponding to the PCB board is set in a fixing plate. The fixing plate is placed between two printing support frames, such that the gap between opposing stops in the two printing support frames is equal to the short side dimension of the fixing plate. First limiting components are set on both sides of the fixing plate, and these first limiting components are used to limit the long side of the fixing plate. Finally, the ejector pin is placed in the limiting through-hole, and the PCB board is placed on the printing support frame for PCB printing. The limiting through-hole in the fixing plate can limit the ejector pin. Simultaneously, the limiting components are used to limit at least one set of opposing sides of the fixing plate, i.e., the limiting components limit the fixing plate. This double limiting achieves the fixing of the ejector pin's position, ensuring that the ejector pin remains stationary during printing, thereby improving the printing efficiency of the PCB board, preventing the ejector pin from touching components in the PCB board, and reducing the defect rate of the printing process. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the fixing plate in this invention;

[0031] Figure 2 This is a schematic diagram of the first limiting component of the U-shaped structure in this invention;

[0032] Figure 3 This is a schematic diagram of the first limiting component of the I-shaped structure in this invention;

[0033] Figure 4 This is a schematic diagram of the structure in which the first limiting component limits the fixing plate in this invention;

[0034] Figure 5 This is a schematic diagram of the structure in which the first limiting component and the second limiting component limit the fixing plate in this invention;

[0035] Figure 6 This is a cross-sectional schematic diagram of the printing support frame in this invention;

[0036] Figure 7 This is a schematic diagram of the ejector pin in this invention.

[0037] Figure label:

[0038] 11. Limiting strip; 12. First magnet; 13. Limiting protrusion; 21. Fixing plate; 22. Limiting through hole; 31. Stop block; 32. Printing support frame; 321. Support block; 322. Fixing block; 323. Supporting plate; 324. Slide groove; 325. Elastic element; 41. Ejector pin. Detailed Implementation

[0039] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0040] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0041] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] Example 1

[0043] like Figures 1-5 As shown, this application discloses a pin fixing device, including a fixing plate 21 and a limiting member. The fixing plate 21 is provided with a limiting through hole 22 for placing the pin 41. The limiting member is fixed to the side of the fixing plate 21 and is used to limit the fixing plate 21.

[0044] Specifically, in this application, the fixed plate 21 is located above the printing platform, the printing platform is provided with a printing support frame 32, the PCB board is placed above the printing support frame 32, and printing equipment such as a printing squeegee is provided above the printing support frame 32.

[0045] In this application, the ejector pin fixing device is used to realize the double-sided printing process. After solder paste is printed on one side of the PCB board, it is flipped over and red glue is printed on the other side. When printing solder paste, the ejector pin 41 does not need to support the PCB board. When printing red glue for the second time, the ejector pin 41 is needed to support the surface of the already printed solder paste from below, and the position of the ejector pin 41 needs to avoid the components in the PCB board to avoid damage to the components.

[0046] In this application, the shape of the limiting member can be determined according to the shape of the fixing plate 21. For example, when the shape of the fixing plate 21 is a cuboid, the limiting member is used to abut and limit the two long sides of the fixing plate 21, or to abut and limit the two long sides and two short sides of the fixing plate 21. The purpose of the limiting member is to fix the position of the fixing plate 21 in the horizontal plane, and the purpose of the fixing plate 21 is to fix the position of the ejector pin 41 in the limiting through hole 22.

[0047] For example, when the fixing plate 21 is hexagonal in shape, the limiting member is used to abut against at least one set of opposite sides of the fixing plate 21. Specifically, the limiting member can fix the position of one set of sides, two sets of sides, or three sets of sides.

[0048] In this application, the shape of the fixing plate 21 can be designed according to the model of the PCB board, that is, according to the layout and position of the components in the PCB board. The design principle is that the limiting through holes 22 need to avoid the high positions of surface mount and self-insertion components, and be distributed as evenly as possible in the fixing plate 21 to achieve uniform support for the PCB board.

[0049] In this application, the model of the fixing plate 21 corresponds one-to-one with the model of the PCB board. Different PCB boards have different component layouts, so the fixing plate 21 required for positioning the ejector pin 41 is different.

[0050] In this embodiment, the ejector pin fixing device includes a fixing plate 21 and a limiting member. The fixing plate 21 is provided with a limiting through hole 22 for placing the ejector pin 41. The limiting member is fixed to the side of the fixing plate 21 and is used to limit the fixing plate 21. The limiting through hole 22 in the fixing plate 21 can limit the ejector pin 41. At the same time, the limiting member is used to limit at least one set of opposite sides of the fixing plate 21. That is, the limiting member is used to limit the fixing plate 21. The position of the ejector pin 41 is fixed through double limiting, ensuring that the ejector pin 41 remains fixed in position during the printing process, thereby improving the printing efficiency of the PCB board, avoiding the ejector pin 41 from touching the components in the PCB board, and reducing the defect rate of the printing process.

[0051] Example 2

[0052] like Figures 1-5 As shown, this embodiment provides a pin fixing device, including a fixing plate 21 and a limiting member. The fixing plate 21 is provided with a limiting through hole 22 for placing the pin 41. The limiting member is fixed to the side of the fixing plate 21 and is used to limit the fixing plate 21.

[0053] Specifically, since both the fixing plate 21 and the limiting component are located on the printing platform, and the printing platform is also equipped with a printing support frame 32, the function of which is to support the edge of the PCB board. In this application, the fixing plate 21 is located between the printing support frames 32. When the ejector pin 41 is placed in the limiting through hole 22, the ejector pin 41 supports the interior of the PCB board.

[0054] Furthermore, two printing support frames 32 are arranged side by side to support both sides of the PCB board. In this application, the printing support frames 32 can be used as one of the limiting members, that is, the distance between two opposite sides of the fixing plate 21 is equal to the gap between the two printing support frames 32. When the fixing plate 21 is placed between the two printing support frames 32, the two opposite sides of the printing support frames 32 abut against the two outer sides of the fixing plate 21 respectively, so as to limit the position of the fixing plate 21.

[0055] In this technical solution, the printing support frame 32 serves as both a support frame for the PCB board and a limiting component for the fixing plate 21. It makes full use of the original printing support frame 32 to limit the position of the fixing plate 21, simplifying the structure of the fixing device, reducing the floor space, and lowering the cost.

[0056] like Figure 5 As shown, further, the inner sidewall of the printing support frame 32, that is, the opposite sides of the two printing support frames 32, is provided with corresponding stop blocks 31. The stop block 31 refers to the protruding structure protruding from the printing support frame 32. In this application, the two opposite stop blocks 31 can be used as one set of limiting members.

[0057] In this technical solution, the printing support frame 32 serves as a support frame for the PCB board. Simultaneously, a stop block 31 is added to utilize the internal space of the PCB board. Note that the stop block 31 is a single protruding structure, and the stop blocks 31 in the two printing support frames 32 correspond one-to-one. Each set of corresponding stop blocks 31 can be used as a set of limiting components, and multiple sets of stop blocks 31 achieve the limiting of the same set of opposite sides in the fixed plate 21. This application uses the stop blocks 31 fixed in the printing support frame 32 to limit the position of the fixed plate 21. This fully utilizes the shape and position of the printing support frame 32, simplifies the structure of the fixing device, reduces the floor space, and lowers costs. Furthermore, it allows for the separation of the printing support frame 32 and the fixed plate 21 through point contact, facilitating the placement and removal of the fixed plate 21 and improving the maintenance and replacement efficiency of the fixed plate 21.

[0058] Example 3

[0059] like Figures 1-5As shown, this embodiment provides a pin fixing device, including a fixing plate 21 and a limiting member. The fixing plate 21 is provided with a limiting through hole 22 for placing the pin 41. The limiting member is fixed to the side of the fixing plate 21 and is used to limit the fixing plate 21.

[0060] In this embodiment, the fixing plate 21 is a cuboid, and the limiting component includes a first limiting component and a second limiting component. The first limiting component abuts against the long side of the fixing plate 21, and the second limiting component abuts against the short side of the fixing plate 21.

[0061] As shown in Embodiment 2, the second limiting component uses the printing support frame 32 or the stop block 31 on the inner side wall of the printing support frame 32 to limit the position of the fixing plate 21. For details, please refer to the description in Embodiment 2, which will not be described in detail here.

[0062] In this embodiment, the first limiting component is a new structure added in addition to the printing support frame 32. Assuming that the second limiting component is used to limit the short side dimension of the fixing plate 21, the first limiting component is used to limit the length of the fixing plate 21.

[0063] Specifically, in this embodiment, the first limiting component includes a limiting strip 11, and the gap between the two limiting strips 11 is equal to the long side dimension of the fixing plate 21, that is, the gap between the two limiting strips 11 is equal to the length of the fixing plate 21.

[0064] In this embodiment, the two limiting strips 11 of the first limiting component are used to limit the fixed plate 21 in the length direction. The second limiting component is the printing support frame 32 in embodiment 2 or the stop block 31 on the inner side wall of the printing support frame 32, which is used to limit the fixed plate 21 in the width direction. Since the printing support frame 32 is fixed in the printing platform, its position is fixed, thereby ensuring that the position of the second limiting component is fixed, so as to limit the position of the fixed plate 21 in the width direction.

[0065] Furthermore, in this application, the limiting strip 11 and the printing platform are respectively magnetically attracted to each other. That is, the limiting strip 11 has a first magnet 12 that attracts the printing platform. When the limiting strip 11 is placed on the limiting platform, due to the magnetic effect, the limiting strip 11 is attracted and fixed on the limiting platform, so that the position of the limiting strip 11 is fixed, thereby ensuring that the position of the first limiting component is fixed, so as to realize the position limitation of the fixing plate 21 in the length direction.

[0066] In this embodiment, the first limiting component and the printing platform are respectively magnetically attracted to each other. The first limiting component is fixed in the printing platform by means of the mutual magnetic attraction. The position of the first limiting component can be fixed without setting up additional fixing components, which simplifies the structure of the ejector pin fixing device. At the same time, it is convenient to adjust the position of the first limiting component and the fixing plate 21 and to maintain and replace them, thereby improving the assembly efficiency of the first limiting component and the fixing plate 21.

[0067] Example 4

[0068] like Figures 1-5 As shown, this embodiment provides a pin fixing device, including a fixing plate 21 and a limiting member. The fixing plate 21 is provided with a limiting through hole 22 for placing the pin 41. The limiting member is fixed to the side of the fixing plate 21 and is used to limit the fixing plate 21.

[0069] In this embodiment, the fixing plate 21 is a cuboid, and the limiting component includes a first limiting component and a second limiting component. The first limiting component abuts against the long side of the fixing plate 21, and the second limiting component abuts against the short side of the fixing plate 21.

[0070] The second limiting component uses a stop 31 on the inner side wall of the printing support frame 32 to limit the position of the fixing plate 21. For details, please refer to the description in Embodiment 2, which will not be described in detail here.

[0071] like Figure 2 and 3 As shown, in this embodiment, the first limiting component includes a limiting strip 11 and limiting protrusions 13 fixed on both sides of the limiting strip 11. The gap between the two limiting strips 11 is equal to the long side dimension of the fixing plate 21, and the gap between the two limiting protrusions 13 in the same first limiting component is equal to the short side dimension of the fixing plate 21. That is, the gap between the two limiting strips 11 is equal to the length of the fixing plate 21, and the gap between the two limiting protrusions 13 in the same first limiting component is equal to the short side dimension of the fixing plate 21.

[0072] Compared to the structure of the first limiting component in Embodiment 3, this embodiment adds limiting protrusions 13 at both ends of the limiting strip 11. In this embodiment, the second limiting component includes at least two opposing stops 31, which are located on the inner sidewall of the printing support frame 32. The stops 31 are located between the two limiting protrusions 13 on the same side of the two first limiting components, and in the direction parallel to the limiting strip 11, the size of the limiting protrusion 13 is equal to the size of the stop 31.

[0073] In this embodiment, since the second limiting component is a stop block 31, the contact area between a single stop block 31 and the fixing plate 21 is small. In order to ensure that the position of the fixing plate 21 is fixed in the width direction, limiting protrusions 13 are added at both ends of the limiting strip 11 of the first limiting component. The limiting protrusions 13 and the stop block 31 located on the same side of the fixing plate 21 abut against the same side edge of the fixing plate 21. In this way, the limiting protrusions 13 and the stop block 31 together limit the position of the fixing plate 21 in the width direction.

[0074] This embodiment cleverly utilizes the structure of the first limiting component to achieve enhanced limiting of the second limiting component. By using the simplest structure, it simultaneously achieves positional limitation in two directions, which not only simplifies the structure of the ejector pin fixing device but also enhances the limiting effect of the limiting component on the fixing plate 21.

[0075] Furthermore, in this application, the limiting protrusion 13 is smaller in size than the limiting strip 11. Therefore, the limiting strip 11 and the printing platform are respectively designed to have mutual attraction magnetism. That is, the limiting strip 11 has a first magnet 12 that attracts the printing platform. When the limiting strip 11 is placed on the limiting platform, due to the magnetic effect, the limiting strip 11 is attracted and fixed on the limiting platform, thereby fixing the positions of the limiting strip 11 and the limiting protrusion 13. This achieves the limitation of the position of the fixing plate 21 in the length direction and the limitation of the position of the two ends of the fixing plate 21 in the width direction. The middle position of the fixing plate 21 in the width direction is limited by the stop block 31.

[0076] Example 5

[0077] like Figures 1-5 As shown, this embodiment provides a pin fixing device, including a fixing plate 21 and a limiting member. The fixing plate 21 is provided with a limiting through hole 22 for placing the pin 41. The limiting member is fixed to the side of the fixing plate 21 and is used to limit the fixing plate 21.

[0078] In this embodiment, the fixing plate 21 is a cuboid, and the limiting component includes a first limiting component and a second limiting component. The first limiting component abuts against the long side of the fixing plate 21, and the second limiting component abuts against the short side of the fixing plate 21.

[0079] The second limiting component uses a stop 31 on the inner wall of the printing support frame 32 to limit the position of the fixing plate 21 in the middle of the width direction. For details, please refer to Embodiment 2, which will not be described in detail here. It should be noted that the number of stop 31s on the inner wall of the printing support frame 32 in this application can be one, three, or any odd number, with one stop 31 abutting against the center of the fixing plate 21, and the remaining even-numbered stop 31s evenly and symmetrically distributed on both sides of the central stop 31. It should also be noted that the stop 31s in the inner walls of the two printing support frames 32 are in one-to-one correspondence; that is, the center lines connecting any group of stop 31s are parallel to each other.

[0080] The first limiting component uses a limiting strip 11 to limit the long side of the fixing plate 21 and a limiting protrusion 13 to limit the short edge of the fixing plate 21. For details, please refer to the description in Embodiment 4; further explanation is not provided here.

[0081] like Figure 2 As shown, in this embodiment, the limiting strip 11 and the two limiting strips 11 form a U-shaped structure, and the two limiting protrusions 13 in the same first limiting component abut against the two opposite sides of the fixing plate 21. That is to say, the limiting protrusions 13 are protrusions arranged in the direction of the fixing plate 21.

[0082] In this embodiment, the first limiting component of the U-shaped structure simultaneously limits the fixing plate 21 in two directions, while occupying a small area, making the structure of the ejector pin fixing device compact, requiring less material, and having a lower cost.

[0083] Furthermore, in this application, the limiting protrusion 13 is smaller in size than the limiting strip 11. Therefore, the limiting strip 11 and the printing platform are respectively provided to have mutual attraction magnetism. That is to say, the limiting strip 11 has a first magnet 12 that attracts the printing platform. When the limiting strip 11 is placed on the limiting platform, due to the magnetic effect, the limiting strip 11 in this application is attracted and fixed on the limiting platform, so that the positions of the limiting strip 11 and the limiting protrusion 13 are fixed.

[0084] Furthermore, in the direction parallel to the limiting strip 11, the size of the limiting protrusion 13 in this embodiment is equal to the size of the stop block 31. If the size of the limiting protrusion 13 is smaller than the size of the stop block 31, when the stop block 31 abuts against the fixing plate 21, the inner side of the limiting protrusion 13 abuts against the fixing plate 21, but the outer side of the limiting protrusion 13 cannot abut against the printing support frame 32. The limiting strip 11 can only be fixed to the printing platform by magnetism. Under the action of external force, the magnetism alone may not be sufficient to ensure that the limiting strip 11 remains fixed. If the size of the limiting protrusion 13 is larger than the size of the stop block 31, when the limiting protrusion 13 abuts against the fixing plate 21, since the other side of the limiting protrusion 13 abuts against the printing support frame 32, the stop block 31 cannot abut against the fixing plate 21. As a second limiting component, the stop block 31 cannot limit the width of the fixing plate 21. Therefore, this application needs to be set in a direction parallel to the limiting strip 11. In this embodiment, the size of the limiting protrusion 13 is equal to the size of the stop 31. This ensures that one side of the stop 31 and the limiting protrusion 13 located on the same side of the fixing plate 21 abuts against the fixing plate 21, and the other side abuts against the printing support frame 32. At this time, the printing support frame 32 can serve as both a fixing member for the stop 31 and a fixing member for the first limiting component. Since the position of the printing support frame 32 is fixed, the positions of the first limiting component and the stop 31 are also fixed. That is, the first limiting component and the second limiting component are synchronously fixed by means of the original printing support frame 32. The fixing efficiency of the ejector pin fixing device is improved by using the simplest and most limited existing device.

[0085] Example 6

[0086] like Figures 1-5 As shown, this embodiment provides a pin fixing device, including a fixing plate 21 and a limiting member. The fixing plate 21 is provided with a limiting through hole 22 for placing the pin 41. The limiting member is fixed to the side of the fixing plate 21 and is used to limit the fixing plate 21.

[0087] In this embodiment, the fixing plate 21 is a cuboid, and the limiting component includes a first limiting component and a second limiting component. The first limiting component abuts against the long side of the fixing plate 21, and the second limiting component abuts against the short side of the fixing plate 21.

[0088] The second limiting component uses a stop 31 on the inner sidewall of the printing support frame 32 to limit the position of the fixing plate 21 in the middle of the width direction. For details, please refer to the description in Embodiment 2; further explanation is not provided here.

[0089] The first limiting component uses a limiting strip 11 to limit the long side of the fixing plate 21 and a limiting protrusion 13 to limit the short edge of the fixing plate 21. For details, please refer to the description in Embodiment 4; further explanation is not provided here.

[0090] The difference from Example 5 is that, as Figure 3 As shown, in this embodiment, the limiting strip 11 and the two limiting strips 11 form an I-shaped structure, and the two limiting protrusions 13 in the same first limiting component abut against the two opposite sides of the fixing plate 21. That is to say, the limiting protrusions 13 are protrusion structures that are simultaneously arranged on both sides perpendicular to the direction of the limiting strip 11.

[0091] In this embodiment, the first limiting component of the I-shaped structure simultaneously limits the fixing plate 21 in two directions, while occupying a small area, making the structure of the ejector pin fixing device compact, using less material, and having a lower cost.

[0092] Similarly, further, in the direction parallel to the limiting strip 11, the size of the limiting protrusion 13 in this embodiment is equal to the size of the stop block 31. If the size of the limiting protrusion 13 is smaller than the size of the stop block 31, when the stop block 31 abuts against the fixing plate 21, the inner side of the limiting protrusion 13 abuts against the fixing plate 21, but the outer side of the limiting protrusion 13 cannot abut against the printing support frame 32. The limiting strip 11 can only be fixed to the printing platform by magnetism. Under the action of external force, the magnetism alone may not be sufficient to ensure that the limiting strip 11 remains fixed. If the size of the limiting protrusion 13 is larger than the size of the stop block 31, when the limiting protrusion 13 abuts against the fixing plate 21, since the other side of the limiting protrusion 13 abuts against the printing support frame 32, the stop block 31 cannot abut against the fixing plate 21. As a second limiting component, the stop block 31 cannot limit the width of the fixing plate 21. Therefore, this application needs to be set in a direction parallel to the limiting strip 11. In this embodiment, the size of the limiting protrusion 13 is equal to the size of the stop 31. This ensures that one side of the stop 31 and the limiting protrusion 13 located on the same side of the fixing plate 21 abuts against the fixing plate 21, and the other side abuts against the printing support frame 32. At this time, the printing support frame 32 can serve as both a fixing member for the stop 31 and a fixing member for the first limiting component. Since the position of the printing support frame 32 is fixed, the positions of the first limiting component and the stop 31 are also fixed. That is, the first limiting component and the second limiting component are synchronously fixed by means of the original printing support frame 32. The fixing efficiency of the ejector pin fixing device is improved by using the simplest and most limited existing device.

[0093] In this embodiment, the first limiting component of the I-shaped structure increases the contact area between the limiting protrusion 13 and the printing support frame 32, thereby enhancing the frictional fixing force of the printing support frame 32 on the first limiting component and further strengthening the fixing effect of the printing support frame 32 on the first limiting component.

[0094] Example 6

[0095] like Figures 1-6As shown, this embodiment provides a pin fixing device, including a fixing plate 21 and a limiting member. The fixing plate 21 is provided with a limiting through hole 22 for placing the pin 41. The limiting member is fixed to the side of the fixing plate 21 and is used to limit the fixing plate 21.

[0096] Specifically, the fixing plate 21 and the limiting component are located on the printing platform, and two parallel printing support frames 32 are also provided in the printing platform. The printing support frames 32 are used to support the bottom ends of the PCB board.

[0097] Furthermore, such as Figure 6 As shown, in this embodiment, the printing support frame 32 includes a slide groove 324 and a plurality of support blocks 321 located above the slide groove 324. Adjacent support blocks 321 are connected by elastic members 325. A fixing block 322 is also provided in the slide groove 324, and the fixing block 322 is located on both sides of the plurality of support blocks 321.

[0098] Specifically, such as Figure 6 As shown, support plates 323 and other support devices can be installed on top of several support blocks 321. The support plates 323 installed on top of the support blocks 321 contact the PCB board to ensure that the support force between the PCB board and the support plates 323 is balanced. The side walls of the support blocks 321 are provided with stop blocks 31, and the support blocks 321 are connected by elastic members 325. The length of the support plate 323 is greater than the length of the PCB board in the same direction. When the support blocks 321 are compressed, the distance between adjacent support blocks 321 decreases. At the same time, after compression, the support blocks 321 on both sides are limited by the fixing blocks 322, thus ensuring that the spacing between the support blocks 321 remains unchanged.

[0099] Furthermore, in this embodiment, the fixed plate is a cuboid, and the limiting component includes a first limiting component and a second limiting component. The first limiting component abuts against the long side of the fixed plate 21, and the second limiting component abuts against the short side of the fixed plate 21.

[0100] The second limiting component uses a stop 31 on the inner sidewall of the printing support frame 32 to limit the position of the fixing plate 21 in the middle of the width direction. For details, please refer to the description in Embodiment 2; further explanation is not provided here.

[0101] The first limiting component uses a limiting strip 11 to limit the long side of the fixing plate 21, and a limiting protrusion 13 to limit the short edge of the fixing plate 21. For details, please refer to Embodiment 4, which will not be elaborated further here. In this embodiment, the limiting strip 11 and the two limiting strips 11 form a U-shaped or I-shaped structure, and in the direction parallel to the limiting strip 11, the size of the limiting protrusion 13 is equal to the size of the stop block 31.

[0102] When the fixing block 322 is fixed between the first limiting component and the second limiting component, one end of the limiting protrusion 13 is connected to the limiting strip 11, and the other side abuts against the printing support frame 32, that is, against the support block 321. In order to further ensure that the position of the limiting protrusion 13 relative to the printing support frame 32 is fixed, this application provides at least one limiting groove adapted to the support block 321 on the surface of the limiting protrusion 13 away from the limiting strip 11. That is, when the limiting strip 11 is placed on both sides of the fixing plate 21, the limiting protrusions 13 on both sides of the limiting strip 11 abut against the support block 321. At the same time, the limiting groove in the limiting protrusion 13 is adapted to and assembled with one of the support blocks 321, so that the contact between the limiting protrusion 13 and the printing support frame 32 changes from planar contact to three-dimensional contact, the contact area increases, the frictional fixing force of the printing support frame 32 on the first limiting component is enhanced, and the fixing effect of the printing support frame 32 on the first limiting component is further strengthened.

[0103] For different models of fixing plates 21, this application can adjust the position between the support frames so that the limiting groove in the first limiting component is always adapted to the support block 321. With the help of the unique structure of the printing support frame 32 and the limiting groove in the limiting protrusion 13, the printing support frame 32 and the first limiting component can be in three-dimensional contact, which further strengthens the fixing effect of the printing support frame 32 on the first limiting component.

[0104] Example 7

[0105] like Figures 1-7 As shown, this embodiment also provides a printing machine, including a printing platform and printing equipment. The printing platform is provided with two parallel printing support frames 32, and a space for accommodating a fixing plate 21 is formed between the printing support frames 32. The fixing plate 21 is provided with a limiting through hole 22, and the position of the limiting through hole 22 corresponds one-to-one with the position of the ejector pin 41 to be placed.

[0106] Specifically, the location of the limiting via 22 needs to meet the following requirements: avoid the higher positions of surface mount and self-insertion components, including the following requirements: 1. A limiting via 22 needs to be placed every 60-80mm; 2. Limiting via 22 needs to be placed for chips and pin headers with a solder paste process of 0.5pitch and below; 3. For SAS process flow, limiting via 22 cannot be placed for self-insertion devices higher than 10mm in the board entry direction; 4. The limiting via 22 needs to be evenly distributed.

[0107] In this application, the fixing plate 21 is made of acrylic material, and the specific PCB board model, version, and board entry direction are marked on the fixing plate 21.

[0108] In this application, the inner diameter of the limiting through hole 22 is approximately 0.5 mm larger than the outer diameter of the ejector pin 41. When the ejector pin 41 is placed in the limiting through hole 22, the pillow of the ejector pin 41 is located at the center of the limiting through hole 22; the limiting through hole 22 limits the position of the ejector pin 41. Figure 7 As shown, the bottom of the ejector pin 41 has a cylindrical structure, and the top has a conical structure.

[0109] In this application, the ejector pin 41 and the printing platform are magnetically attracted to each other. When the ejector pin 41 is placed in the limiting through hole 22, the ejector pin 41 is fixed in the printing platform by magnetic attraction. At the same time, this application sets the limiting through hole 22 to limit the position of the ejector pin 41, and the fixing plate 21 is limited again by the limiting member. Through multiple limiting effects, the position of the ejector pin 41 is ultimately fixed during the printing process, avoiding positional deviation.

[0110] When the fixing plate 21 and the ejector pin 41 are placed on the printing platform, the height of the fixing plate 21 and the limiting member is less than the height of the ejector pin 41, and the height of the ejector pin 41 is the same as the height of the printing support frame 32. Here, the height refers to the height based on the printing platform. When the PCB board is placed in the printing support frame 32, the ejector pin 41 and the printing support frame 32 support the PCB board from the middle and both ends, respectively, and the limiting member and the fixing plate 21 do not contact the PCB board.

[0111] Example 8

[0112] This embodiment also provides a method for fixing the ejector pin 41 in a printing press, including the following steps:

[0113] S1: Set a limiting through hole 22 in the fixing plate 21 corresponding to the PCB board; the fixing plate 21 is made of acrylic material, and the specific PCB board model, version and board entry direction are marked in the fixing plate 21.

[0114] S2: Adjust the distance between the two printing support frames 32 in the printing platform. The inner sidewall of the printing support frame 32 is provided with a stop 31, so that the gap between the opposite stop 31 in the two printing support frames 32 is equal to the short side dimension of the fixed plate 21.

[0115] Alternatively, the distance between the two printing support frames 32 in the printing platform can be kept fixed, and the short side dimension of the fixed plate 21 can be designed to be equal to the gap dimension between the opposite blocks 31 in the printing support frame 32, which is equal to the short side dimension of the fixed plate 21.

[0116] S3: First limiting components are provided on both sides of the fixing plate 21. The first limiting components include limiting strips 11 and limiting protrusions 13 fixed on both sides of the limiting strips 11. The limiting strips 11 abut against the two sides of the fixing plate 21, and the stop block 31 is located between the two limiting protrusions 13 on the same side of the two first limiting components. The limiting strips 11 and the two limiting strips 11 form a U-shaped structure or an I-shaped structure, and the two limiting protrusions 13 in the same first limiting component abut against the two opposite sides of the fixing plate 21 respectively.

[0117] Since the second limiting component is a stop block 31, the contact area between a single stop block 31 and the fixing plate 21 is small. To ensure that the fixing plate 21 is fixed in the width direction, limiting protrusions 13 are added to both ends of the limiting strip 11 of the first limiting component. The limiting protrusions 13 and the stop block 31 located on the same side of the fixing plate 21 abut against the same side edge of the fixing plate 21. In this way, the limiting protrusions 13 and the stop block 31 together limit the position of the fixing plate 21 in the width direction. This embodiment cleverly uses the structure of the first limiting component to achieve enhanced limiting of the second limiting component. It uses the simplest structure to simultaneously achieve position limiting in two directions, which not only simplifies the structure of the ejector pin fixing device, but also enhances the limiting effect of the limiting component on the fixing plate 21.

[0118] S4: Place the ejector pin 41 in the limiting through hole 22, place the PCB board on the printing support frame 32, and perform PCB board printing.

[0119] The limiting through hole 22 in the fixing plate 21 can limit the ejector pin 41. At the same time, the limiting component is used to limit at least one set of opposite sides of the fixing plate 21. That is, the limiting component is used to limit the fixing plate 21. The position of the ejector pin 41 is fixed through double limiting, ensuring that the ejector pin 41 remains fixed in position during the printing process, thereby improving the printing efficiency of the PCB board, avoiding the ejector pin 41 from touching the components in the PCB board, and reducing the defect rate of the printing process.

[0120] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not 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 a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0121] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0122] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0123] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pin fixing device, characterized in that, The device includes a fixed plate (21) and a limiting member. The fixed plate (21) has a limiting through hole (22) for placing a pin (41). The limiting member is fixed to the side of the fixed plate (21) and is used to limit the fixed plate (21). The fixed plate (21) is a cuboid. The limiting member includes a first limiting component and a second limiting component. The first limiting component abuts against the long side of the fixed plate (21), and the second limiting component abuts against the short side of the fixed plate (21). The first limiting component includes a limiting strip (11) and limiting protrusions (13) fixed on both sides of the limiting strip (11). The gap between the two limiting strips (11) is equal to the long side of the fixed plate (21), and the gap between the two limiting protrusions (13) in the same first limiting component is equal to the short side of the fixed plate (21). The fixing plate is located between two parallel printing support frames (32), and the second limiting component includes at least two opposing blocks (31). The blocks (31) are located between two limiting protrusions (13) on the same side of the two first limiting components, and the size of the limiting protrusions (13) is equal to the size of the blocks (31) in the direction parallel to the limiting strip (11). The printing support frame (32) includes a slide (324) and several support blocks (321) located above the slide (324). A support plate (323) can also be set on the top of the several support blocks (321). The support plate (323) set on the top of the several support blocks (321) contacts the PCB board. The limiting protrusion (13) has at least one limiting groove adapted to the support block (321) on the side surface away from the limiting strip (11). When the limiting strip (11) is placed on both sides of the fixing plate (21), the limiting groove in the limiting protrusion (13) is adapted to and assembled with one of the support blocks (321).

2. The pin fixing device according to claim 1, characterized in that, The limiting strip (11) and the two limiting protrusions (13) form a U-shaped structure or an I-shaped structure.

3. The pin fixing device according to claim 1, characterized in that, The first limiting component is located in the printing platform, and the first limiting component and the printing platform are respectively magnetically attracted to each other.

4. The pin fixing device according to claim 1, characterized in that, The fixing plate (21) is located in the printing platform, and the ejector pin (41) and the printing platform are respectively magnetically attracted to each other.

5. A printing press, characterized in that, Includes the pin fixing device as described in any one of claims 1-4.

6. A method for fixing ejector pins in a printing press, characterized in that, The implementation based on the pin fixing device according to any one of claims 1-4 includes the following steps: A limiting through hole (22) corresponding to the PCB board is provided in the fixing plate (21); The fixing plate (21) is placed between two printing support frames (32), the printing support frames (32) being relative to the short side dimension of the fixing plate (21); First limiting components are provided on both sides of the fixing plate (21), and the first limiting components are used to limit the long side of the fixing plate (21); Place the ejector pin (41) in the limiting through hole (22), place the PCB board on the printing support frame (32), and perform PCB board printing.

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