Universal batch QFN (Quad Flat No-lead) side tinning device

Abstract

The invention discloses a universal batch QFN side edge tin coating device which comprises a placing shell, a device bin is formed in the top of the placing shell, an elastic extrusion assembly is arranged on one side of an inner cavity of the device bin, and the elastic extrusion assembly is used for conducting extrusion positioning on the end faces of a plurality of groups of QFN devices. And the back of the inner cavity of the device bin is also provided with a size limiting assembly. The invention relates to the technical field of tin coating of QFN packaging. According to the universal batch QFN side edge tinning device, through arrangement of the placement shell and the device bin, an assembly space is provided for side-standing batch placement of QFN devices, overall extrusion is conducted on the side-standing QFN devices in cooperation with arrangement of the elastic extrusion assembly, the side-standing stability of the QFN devices is guaranteed, meanwhile, the size of the QFN devices is limited in cooperation with arrangement of the size limiting assembly, and the quality of the QFN devices is improved. According to the invention, regular limiting of the QFN devices placed in batches is realized, and tidy arrangement of the QFN devices is ensured, so that batch tinning processing of the QFN devices is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of tinning for QFN packaging, and specifically to a general-purpose batch QFN side tinning device. Background Art

[0002] With the development of electronic products towards miniaturization and high performance, QFN devices, namely quad flat no-lead packaging devices, are increasingly widely used in electronic products due to their light weight, small size, and excellent thermal and electrical performance. Currently, the plastic-encapsulated QFN devices commonly used in electronic products can be divided into two forms: stamping separation and cutting separation according to different cutting methods. The bottom surface of the solder end is generally plated with NiPdAu or Sn, and the side surface of the solder end is bare Cu. Since the bare Cu surface is prone to oxidation. Usually, the manufacturer requires that a good metallurgical bond can be formed on the Sn-plated surface at the bottom to ensure the connection quality, and it is not mandatory to wet the bare copper surface on the side of the solder end. However, if the wetting of the side solder end can be achieved, it will have a certain improvement effect on the reliability of the solder joint. When there are high requirements for the side tin climbing of QFN devices, tinning is required to restore the solderability of devices whose sides have been oxidized or whose solderability has decreased.

[0003] QFN devices are small, difficult to fix during single operation, with low operation efficiency, and the bottom is prone to tin adhesion during tinning. Therefore, a general-purpose batch QFN side tinning device is specifically proposed to achieve the tinning of a large number of QFN devices, which has the operational advantages of simplicity, speed, and high efficiency, and is applicable to QFN devices of different sizes. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a general-purpose batch QFN side tinning device, which solves the problems of small size of QFN devices, difficult to fix during single operation, low operation efficiency, and easy tin adhesion at the bottom during tinning.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A general-purpose batch QFN side tinning device includes a placement shell. A device bin is opened at the top of the placement shell. One side of the inner cavity of the device bin is provided with an elastic extrusion assembly for axially extruding and positioning a plurality of groups of QFN devices. The back of the inner cavity of the device bin is also provided with a size limiting assembly for laterally extruding and positioning a plurality of groups of QFN devices.

[0006] The present invention is further provided as: The elastic extrusion assembly includes a first screw rod. One end of the first screw rod is fixedly installed with an extrusion plate, and a first spring is also sleeved on the outer circumference of the first screw rod.

[0007] The present invention is further configured as follows: one end of the first screw rod passes through the placement shell and is fixedly installed with a first lifting block, the extrusion plate is arranged inside the device bin, and the two ends of the first spring are respectively fixedly connected to the extrusion plate and the side opposite to the device bin.

[0008] The present invention is further configured as follows: a working groove and two limit grooves are provided on the back of the extrusion plate, the two limit grooves are respectively arranged on the upper and lower sides of the working groove, sliders are slidably installed inside the two limit grooves, an expansion plate is fixedly installed on the rear ends of the two sliders, a guide rod is fixedly installed on the front side of the expansion plate, a second spring is sleeved on the outer periphery of the guide rod, and the second spring is arranged inside the working groove, and a guide hole used in conjunction with the guide rod is also provided inside the working groove.

[0009] The present invention is further configured as follows: guide grooves are provided at the top and bottom of the inner cavity of the limiting groove, guide blocks are fixedly installed at the top and bottom of the sliding block, and the guide blocks are slidably matched with the guide grooves.

[0010] The present invention is further configured as follows: the first screw rod is slidably matched with the placement shell, a first nut is installed on the outer peripheral thread of the first screw rod, and the first nut is arranged outside the placement shell.

[0011] The present invention is further configured as follows: the size limiting assembly includes a limiting plate, a second screw is fixedly installed on the back of the limiting plate, one end of the second screw passes through the placement shell and is fixedly installed with a second lifting block, the limiting plate is arranged inside the device bin, and a third spring is also sleeved on the outer periphery of the second screw, and the two ends of the third spring are respectively fixedly connected to the limiting plate and the back of the inner cavity of the device bin; Two auxiliary blocks are fixedly mounted on both sides of the limit plate, and auxiliary grooves used in conjunction with the auxiliary blocks are provided on both sides of the inner cavity of the device bin.

[0012] The present invention is further configured as follows: the second screw rod is slidably matched with the placement shell, a second nut is threadedly mounted on the outer periphery of the second screw rod, and the second nut is arranged outside the placement shell.

[0013] The present invention provides a universal batch QFN side tinning device, which has the following beneficial effects: (1) The present invention provides an assembly space for the side-standing batch placement of QFN devices by setting a placement shell and a device bin. The side-standing QFN devices are integrally extruded by the setting of an elastic extrusion component to ensure the side-standing stability of the QFN devices. At the same time, the size limiting component is set to achieve regular positioning of the batch-placed QFN devices, ensuring that the QFN devices are neatly arranged, so as to facilitate the batch tin-plating processing of the QFN devices.

[0014] (2) Through the cooperation of the first screw rod, the extrusion plate, the first spring and the first nut, the present invention realizes the extrusion positioning of the QFN devices placed side by side in batches by using the extrusion plate. With the setting of the first nut, the elastic strength of the first spring is adjusted to avoid excessive extrusion of the QFN devices by the extrusion plate, providing surface quality protection for the QFN devices. Similarly, by using the second nut to adjust the elastic strength of the third spring, excessive extrusion of the back of the QFN devices by the limiting plate is avoided, providing a stable and reliable working environment for the batch tinning of the QFN devices. Description of the Drawings

[0015] Figure 1 is a schematic diagram of the external structure of the present invention; Figure 2 is a schematic connection diagram of the placement shell, the elastic extrusion assembly and the size limiting assembly structures of the present invention; Figure 3 is a schematic diagram of the structures of the extrusion plate, the working groove, the limiting groove, the slider, the extension plate, the guide rod, the second spring, the guide hole, the guide groove and the guide block of the present invention; Figure 4 is a top view of the present invention; Figure 5 is a schematic diagram of the QFN devices placed side by side in batches in the device bin in the embodiment of the present invention.

[0016] In the figure: 1. Placement shell; 101. Device bin; 2. Elastic extrusion assembly; 201. First screw rod; 202. Extrusion plate; 203. First spring; 204. First lifting block; 205. Working groove; 206. Limiting groove; 207. Slider; 208. Extension plate; 209. Guide rod; 2010. Second spring; 2011. Guide hole; 2012. Guide groove; 2013. Guide block; 2014. First nut; 3. Size limiting assembly; 301. Limiting plate; 302. Second screw rod; 303. Second lifting block; 304. Auxiliary block; 305. Auxiliary groove; 306. Second nut; 307. Third spring. Detailed Embodiment

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention.

[0018] Please refer to Figures 1-5 , the embodiments of the present invention provide the following technical solutions: Embodiment 1 General-purpose batch QFN side tinning device, including a placement shell 1. A device bin 101 is opened at the top of the placement shell 1. One side of the inner cavity of the device bin 101 is provided with an elastic extrusion assembly 2, and the elastic extrusion assembly 2 is used to perform end extrusion positioning on several groups of QFN devices.

[0019] It should be noted that at this time, the device bin 101 is arranged in a square groove shape and is matched with the size of the QFN device. After several QFN devices are placed upright in the device bin 101, the elastic extrusion assembly 2 is used to perform extrusion positioning on several QFN devices. Specifically, the elastic extrusion assembly 2 includes a first screw 201. One end of the first screw 201 is fixedly installed with an extrusion plate 202. A first spring 203 is also sleeved on the outer circumference of the first screw 201. One end of the first screw 201 penetrates through the placement shell 1 and is fixedly installed with a first lifting block 204. The first screw 201 is slidably matched with the placement shell 1. The extrusion plate 202 is arranged inside the device bin 101. Both ends of the first spring 203 are fixedly connected to the extrusion plate 202 and the opposite side of the device bin 101 respectively.

[0020] Furthermore, in order to prevent the first spring 203 from excessively squeezing the QFN device and causing surface damage to it, a first nut 2014 is threadedly installed on the outer circumference of the first screw 201, and the first nut 2014 is arranged outside the placement shell 1.

[0021] After the extrusion of several QFN devices is completed, several QFN devices present the state as shown in the appendix Figure 5 and then the tinning operation can be carried out.

[0022] In this embodiment, by opening a device bin 101 specifically adapted to the QFN device, batch tinning of the QFN device can be achieved.

[0023] Embodiment 2 As an improvement over the previous embodiment, the general-purpose batch QFN side tinning device further includes a size limiting component 3 disposed on the back of the inner cavity of the device bin 101. The size limiting component 3 is used to perform side extrusion positioning on several groups of QFN devices. At this time, the device bin 101 does not need to be specifically adapted to the design of QFN devices. Specifically, the size limiting component 3 includes a limiting plate 301. A second screw 302 is fixedly installed on the back of the limiting plate 301. One end of the second screw 302 penetrates through the placement shell 1 and is fixedly installed with a second lifting block 303. The limiting plate 301 is disposed inside the device bin 101. To ensure the stability of the movement of the limiting plate 301, two auxiliary blocks 304 are fixedly installed on both sides of the limiting plate 301. Auxiliary slots 305 that cooperate with the auxiliary blocks 304 are provided on both sides of the inner cavity of the device bin 101. A third spring 307 is also sleeved on the outer periphery of the second screw 302. The two ends of the third spring 307 are respectively fixedly connected to the limiting plate 301 and the back of the inner cavity of the device bin 101.

[0024] During use, the third spring 307 is used to perform back extrusion on the QFN devices to achieve the neat sorting of several QFN devices. In this way, tinning processing of QFN devices of different sizes can also be realized, which has good applicability.

[0025] Furthermore, to prevent the third spring 307 from excessively squeezing the QFN devices, the second screw 302 is slidably fitted with the placement shell 1. A second nut 306 is threadedly installed on the outer periphery of the second screw 302, and the second nut 306 is disposed outside the placement shell 1.

[0026] As a preferred solution, to improve the comprehensiveness of the side extrusion of the QFN devices by the extrusion plate 202, a working slot 205 and two limiting slots 206 are provided on the back of the extrusion plate 202. The two limiting slots 206 are respectively disposed on the upper and lower sides of the working slot 205. Sliders 207 are slidably installed inside the two limiting slots 206. An extension plate 208 is fixedly installed at the rear ends of the two sliders 207. A guide rod 209 is fixedly installed on the front surface of the extension plate 208. A second spring 2010 is sleeved on the outer periphery of the guide rod 209, and the second spring 2010 is disposed inside the working slot 205. A guide hole 2011 that cooperates with the guide rod 209 is also provided inside the working slot 205. Furthermore, to improve the stability of the slider 207, guide slots 2012 are provided at the top and bottom of the inner cavity of the limiting slot 206. Guide blocks 2013 are fixedly installed at the top and bottom of the slider 207, and the guide blocks 2013 are slidably fitted with the guide slots 2012.

[0027] The advantages of the second embodiment over the first embodiment are as follows: It has higher applicability and can realize batch processing of QFN devices of different sizes.

[0028] It should be noted that, in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Universal batch QFN side tinning device, characterized by: The device comprises a placement shell (1), wherein a device compartment (101) is provided on the top of the placement shell (1), an elastic extrusion component (2) is provided on one side of the inner cavity of the device compartment (101), and the elastic extrusion component (2) is used to perform end-face extrusion positioning of a plurality of groups of QFN devices, and a size limiting component (3) is further provided on the back of the inner cavity of the device compartment (101), and the size limiting component (3) is used to perform side-face extrusion positioning of a plurality of groups of QFN devices.

2. The universal batch QFN side tinning device according to claim 1, characterized in that: The elastic extrusion assembly (2) comprises a first screw rod (201), one end of the first screw rod (201) being fixedly mounted with an extrusion plate (202), and the outer circumference of the first screw rod (201) being further sleeved with a first spring (203).

3. The universal batch QFN side tinning device according to claim 2, characterized in that: One end of the first screw rod (201) passes through the placement shell (1) and is fixedly mounted with a first lifting block (204); the extrusion plate (202) is arranged inside the device bin (101); and the two ends of the first spring (203) are respectively fixedly connected to the extrusion plate (202) and the side opposite to the device bin (101).

4. The universal batch QFN side tinning device according to claim 3 is characterized in that: The back of the extrusion plate (202) is provided with a working groove (205) and two limiting grooves (206), the two limiting grooves (206) are respectively arranged at the upper and lower sides of the working groove (205), the inside of the two limiting grooves (206) are both slidably mounted with sliders (207), the rear ends of the two sliders (207) are jointly fixedly mounted with an expansion plate (208), the front of the expansion plate (208) is fixedly mounted with a guide rod (209), the outer periphery of the guide rod (209) is sleeved with a second spring (2010), and the second spring (2010) is arranged inside the working groove (205), and the inside of the working groove (205) is also provided with a guide hole (211) used in conjunction with the guide rod (209).

5. The universal batch QFN side tinning device according to claim 4, characterized in that: The top and bottom of the inner cavity of the limiting groove (206) are both provided with guide grooves (2012), and the top and bottom of the sliding block (207) are both fixedly mounted with guide blocks (2013), and the guide blocks (2013) are slidably matched with the guide grooves (2012).

6. The universal batch QFN side tinning device according to claim 3, characterized in that: The first screw rod (201) is slidably matched with the placement shell (1); a first nut (2014) is installed on the outer peripheral thread of the first screw rod (201), and the first nut (2014) is arranged outside the placement shell (1).

7. The universal batch QFN side tinning device according to claim 1, characterized in that: The size limiting assembly (3) comprises a limiting plate (301), a second screw rod (302) being fixedly mounted on the back of the limiting plate (301), one end of the second screw rod (302) passing through the placement shell (1) and being fixedly mounted with a second lifting block (303), the limiting plate (301) being arranged inside the device bin (101), a third spring (307) being sleeved on the outer circumference of the second screw rod (302), and two ends of the third spring (307) being fixedly connected to the limiting plate (301) and the back of the inner cavity of the device bin (101), respectively; Two auxiliary blocks (304) are fixedly mounted on both sides of the limit plate (301), and auxiliary grooves (305) for use with the auxiliary blocks (304) are provided on both sides of the inner cavity of the device bin (101).

8. The universal batch QFN side tinning device according to claim 7, characterized in that: The second screw rod (302) is in sliding cooperation with the placement shell (1); a second nut (306) is threadedly mounted on the outer periphery of the second screw rod (302); and the second nut (306) is arranged outside the placement shell (1).

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