Terminal clamping device and pin inserting machine

Abstract

The utility model provides a terminal clamping device. The terminal clamping device comprises a clamping part, a mounting part and a vacuum generation system, the clamping part comprises a terminal accommodating cavity which is used for accommodating and clamping a terminal; the mounting part is used for connecting the clamping part and the vacuum generation system; the vacuum generation system is used for generating vacuum negative pressure and adsorbing the terminal; the shape of the terminal accommodating cavity is matched with the shape of the root part of the terminal; and the width of the terminal accommodating cavity is slightly greater than that of the root part of the adsorbed terminal. The utility model also provides a pin inserting machine comprising the terminal clamping device. According to the utility model, a vacuum adsorption mode is adopted to clamp the terminal instead of an existing mode of clamping the terminal by an elastic mechanism, so that the problems of cleanliness and pin falling and pin shortage are solved.

Description

Technical Field

[0001] This utility model relates to a terminal clamping device, and more particularly to a terminal clamping device used in a solderless terminal pin insertion machine. Background Technology

[0002] In existing pin insertion machines, regardless of whether a separate or integrated chuck is used, all terminal clamping methods rely on elastic clamping. The working sequence of the pin insertion machine is as follows: the chuck first clamps the terminal, then the terminal and the strip are cut to separate the terminal from the strip, and finally the chuck inserts the pin with the terminal attached. Because the chuck is relatively large, it often clamps the top of the terminal initially; otherwise, the chuck and the cutter will interfere with each other. When inserting the pin downwards, the force surface of the terminal is on the lower shoulder, so the terminal will slip / rub within the chuck during the insertion process.

[0003] This friction process often produces metal shavings. Since the automotive electronics industry now has increasingly high requirements for product cleanliness, the falling shavings can, at best, affect the cleanliness requirements of the product, and at worst, may cause a short circuit, affecting the product quality and function.

[0004] In addition, because the terminals are often very thin, with a maximum size of 0.8mm, the elastic clamping method often cannot provide the device with a signal indicating whether the terminals are clamped. Therefore, if a pin falls out or is missing during insertion, the device cannot recognize it, which can lead to defective products not being detected in time, and may even result in them reaching the customer. Utility Model Content

[0005] In order to overcome the above-mentioned technical defects, the purpose of this utility model is to provide a terminal clamping device, characterized in that it includes: a clamping part, a mounting part, and a vacuum generating system;

[0006] The clamping part includes a terminal receiving cavity for receiving and clamping terminals;

[0007] The mounting part is used to connect the clamping part and the vacuum generating system;

[0008] The vacuum generating system is used to generate a vacuum negative pressure for adsorption terminals;

[0009] The shape of the terminal receiving cavity matches the shape of the root of the terminal;

[0010] The width of the terminal receiving cavity is slightly larger than the width of the root of the adsorbed terminal.

[0011] Furthermore, the vacuum generating system includes:

[0012] Vacuum generator and vacuum pressure monitor;

[0013] The vacuum generator is used to generate a vacuum; the vacuum pressure monitor is used to monitor the negative pressure value of the vacuum.

[0014] The pressure monitor is connected to the vacuum generator via an air tube;

[0015] The mounting section is connected to the vacuum generator via an air pipe.

[0016] Furthermore, there is a single-sided gap a between one side of the terminal receiving cavity and the adsorbed terminal, wherein the value of a ranges from 0.07mm to 0.13mm.

[0017] Furthermore, a = 0.1 mm.

[0018] Furthermore, a threshold is set on the vacuum pressure monitor. When the negative pressure value monitored by the vacuum pressure monitor is lower than the threshold, an alarm is triggered.

[0019] Furthermore, the clamping part is made of steel, one end of the clamping part is used to clamp the terminal, and the other end of the clamping part is inserted into the corresponding hole of the mounting part and fixed with a fastener.

[0020] This application also discloses a pin insertion machine, including the terminal clamping device as described in any of the above.

[0021] Compared with the prior art, this application has the following advantages:

[0022] (1) Non-contact adsorption

[0023] The vacuum tube opening is slightly larger than the terminal to avoid mechanical friction from traditional elastic clamping, thus eliminating the generation of metal debris at the source.

[0024] (2) Airflow debris management

[0025] Vacuum airflow actively adsorbs residual debris (such as cutting residue) to prevent it from falling onto the PCBA board, meeting the high cleanliness requirements of automotive electronics and other applications.

[0026] (3) Signal detection and quality monitoring

[0027] Vacuum signal difference identification: The significant vacuum difference between the adsorption state and the non-adsorption state of the terminal can be used to determine the missing or missing needles in real time, preventing defective products from flowing into the next process or to the customer. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the insertion process in the prior art;

[0029] Figure 2 This is a schematic diagram of a specific embodiment of a terminal clamping device disclosed in this application;

[0030] Figure 3 This is a schematic diagram illustrating the process of the terminal clamping device disclosed in this application clamping a terminal.

[0031] Figure label:

[0032] 1. Clamping part; 2. Mounting part; 3. Vacuum generating system; 31. Vacuum pressure monitoring instrument; 32. Vacuum generator;

[0033] 4. The root of the terminal. Detailed Implementation

[0034] The advantages of this disclosure are further illustrated below with reference to the accompanying drawings and specific embodiments.

[0035] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this disclosure, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrating this invention and has no specific meaning in itself. Therefore, "module" and "part" can be used interchangeably.

[0041] See Figure 1 The existing pin insertion process, in which Figure 1 A represents the terminal cutting and separation stage; Figure 1 B is before the pin is inserted; Figure 1 C represents the insertion process. Specifically, after the terminal is separated from the terminal strip by the cutter, the insertion head begins to move downwards to insert the terminal. In the current technology, the contact between the elastic clamp and the terminal is a hard contact. During the insertion process, the terminal will slide in the clamp, and this friction process can easily generate metal shavings.

[0042] See Figure 2 A specific embodiment of the terminal clamping device provided in this application includes:

[0043] The device comprises a clamping part 1, a mounting part 2, and a vacuum generating system 3. The clamping part 1 includes a terminal receiving cavity 11 for accommodating and clamping a terminal. The mounting part 2 connects the clamping part 1 and the vacuum generating system 3. The vacuum generating system 3 generates a vacuum negative pressure to attract the terminal. The shape of the terminal receiving cavity 11 matches the shape of the root 4 of the terminal. This application does not specifically limit the shape of the terminal receiving cavity 11; during clamping, the root 4 of the terminal can be inserted into the interior of the terminal receiving cavity 11. The width of the terminal receiving cavity 11 is slightly larger than the width of the root 4 of the attracted terminal.

[0044] The vacuum generating system 3 includes a vacuum generator 32 and a vacuum pressure monitoring instrument 31. The vacuum generator 32 is used to generate a vacuum; the vacuum pressure monitoring instrument 31 is used to monitor the negative pressure value of the vacuum; the pressure monitoring instrument 31 is connected to the vacuum generator 32 via an air pipe; the mounting part 2 is connected to the vacuum generator 32 via an air pipe.

[0045] See Figure 2-3 In this embodiment, the clamping part 1 is cuboid in shape, including a terminal receiving cavity 11, which is also cuboid in shape. The width of the opening of the terminal receiving cavity 11 is slightly larger than the width of the root 4 of the terminal. After the clamping part 1 is inserted into the root 4 of the terminal, a gap 'a' is left on both sides of the terminal receiving cavity 11 and the terminal. This non-contact adsorption avoids the mechanical friction of traditional elastic clamping and eliminates the generation of metal debris at the source.

[0046] Preferably, the value of the single-sided gap 'a' is between 0.07 mm and 0.13 mm.

[0047] More preferably, the single-sided gap a = 0.1 mm.

[0048] The clamping part 1 can be made of steel. One end of the clamping part 1 is used to clamp the terminal, and the other end of the clamping part is directly inserted into the corresponding hole of the mounting part 2 and fixed with a set screw (not shown in the figure). The mounting part 2 is a universal structure that can be adapted to clamping parts 1 of different sizes, as long as the type and size of the connection are consistent. This application does not impose any specific limitations on it.

[0049] The mounting part 2 is connected to the vacuum generating system 3. The mounting part 2 and the vacuum generator 32 are connected by an air pipe, and the pressure monitoring instrument 31 is also connected to the vacuum generator 32 by an air pipe.

[0050] See Figure 3 The specific process of the terminal clamping device disclosed in this application clamping the terminal is as follows:

[0051] Specifically, Figure 3 A represents the terminal cutting and separation stage. Figure 3 B is before the pin is inserted. Figure 3 C represents the pin insertion process stage.

[0052] During the terminal cutting and separation stage, the clamping part 1 moves down to cover the root 4 of the terminal, while the vacuum generator 32 generates negative pressure (approximately 20 mbar) to hold the terminal (the terminal weighs approximately 0.06 g). After cutting, due to the vacuum negative pressure, the terminal is sucked into the terminal receiving cavity 11 of the clamping part 1 until the shoulder of the terminal contacts the lower end face of the clamping part 1. If a small amount of metal debris is generated during this process, the debris will be sucked away by the vacuum negative pressure and will not fall onto the PCBA board. Then, the terminal receiving cavity 11 of the clamping part 1 holds the terminal downwards and inserts it into the hole in the PCBA board. The vacuum negative pressure is kept on throughout this process. If any abnormal situation such as the terminal falling off occurs, the negative pressure value will change accordingly, and the vacuum pressure monitor 31 will give an alarm prompt, thus pausing the insertion process and waiting for maintenance. Specifically, a negative pressure threshold, such as 20 mbar, is set on the vacuum pressure monitor 31. When the vacuum generator 32 is turned on and there are no terminals on the clamping part 1, the negative pressure value will be lower than this threshold, such as 10 mbar. At this time, the vacuum pressure monitor 31 will alarm. That is, if the negative pressure is lower than the set threshold during the insertion process, the device will alarm. This application identifies the difference in vacuum signal, that is, the terminal adsorption state and the non-adsorption state form a significant vacuum difference. Therefore, it can determine the missing / incomplete needle in real time and prevent defective products from flowing into the next process or customer.

[0053] In existing technologies, cleaning equipment is typically installed after the pin insertion machine to remove metal debris that falls onto the board, and AOI is installed to monitor for missing pins. However, the added equipment undoubtedly increases the investment and cost of the production line significantly.

[0054] This application is mainly used for solderless terminal insertion on PCBAs, as PCBA assembly often has higher requirements for cleanliness and quality. This application primarily uses vacuum adsorption to clamp the terminals instead of the existing method of using elastic mechanisms to clamp the terminals, thereby solving the problems of cleanliness and missing or lost pins.

[0055] This application provides a vacuum adsorption structure for clamping terminals. Because it is a vacuum adsorption process, the opening of the vacuum tube is often slightly larger than the terminal size. Therefore, there is no friction during adsorption, and even if a small amount of metal debris is generated, it will be sucked away by the vacuum, thus eliminating the risk of debris falling onto the PCBA board and causing defects. Simultaneously, vacuum adsorption produces a significant signal difference; that is, there are two completely different vacuum signals when the terminal is adsorbed and when it is not. This allows for accurate determination of whether there are missing or dropped pins during the pin insertion process, enabling timely detection of defective products and preventing them from flowing to the next process or even the customer.

[0056] It should be noted that the embodiments of this application are more feasible and are not intended to limit this application in any way. Any person skilled in the art may use the above-disclosed technical content to change or modify it into equivalent effective embodiments. However, any modifications or equivalent changes and modifications made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A terminal clamping device, characterized in that, include: Clamping part, mounting part and vacuum generating system; The clamping part includes a terminal receiving cavity for receiving and clamping terminals; The mounting part is used to connect the clamping part and the vacuum generating system; The vacuum generating system is used to generate a vacuum negative pressure for adsorption terminals; The shape of the terminal receiving cavity matches the shape of the root of the terminal; The width of the terminal receiving cavity is slightly larger than the width of the root of the adsorbed terminal.

2. The terminal clamping device as described in claim 1, characterized in that, The vacuum generating system includes: Vacuum generator and vacuum pressure monitor; The vacuum generator is used to generate a vacuum; the vacuum pressure monitor is used to monitor the negative pressure value of the vacuum. The pressure monitor is connected to the vacuum generator via an air tube; The mounting section is connected to the vacuum generator via an air pipe.

3. The terminal clamping device as described in claim 1, characterized in that, There is a single-sided gap a between one side of the terminal receiving cavity and the adsorbed terminal, wherein the value of a ranges from 0.07mm to 0.13mm.

4. The terminal clamping device as described in claim 3, characterized in that, a = 0.1 mm.

5. The terminal clamping device as described in claim 2, characterized in that, A threshold is set on the vacuum pressure monitor. When the negative pressure value monitored by the vacuum pressure monitor is lower than the threshold, an alarm is triggered.

6. The terminal clamping device as described in claim 1, characterized in that, The clamping part is made of steel. One end of the clamping part is used to clamp the terminal, and the other end of the clamping part is inserted into the corresponding hole of the mounting part and fixed with a fastener.

7. A pin insertion machine, characterized in that, Includes the terminal clamping device as described in any one of claims 1-6.

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