Burning jig

Abstract

The utility model relates to the technical field of burning equipment, and discloses a burning jig which comprises a base used for placing a circuit board needing to be burnt; the downward pressing mechanism is connected to the base and provided with a liftable downward pressing rod, and a connector is arranged at the bottom end of the downward pressing rod; the clamping ring is arranged on the connector in a sleeving mode and can be fixed after rotating to a preset angle relative to the connector in the circumferential direction; the connecting arm is slidably connected to the clamping ring in the horizontal direction and can be fixed after sliding to a preset position relative to the clamping ring; and the ejector pin is in a vertical state, is connected to the connecting arm, is used for being electrically connected with a burning signal line, and is used for being electrically contacted with a burning terminal on the circuit board when the lower pressing rod descends so as to burn the circuit board. By means of the mode, the burning jig can be compatible with PCBAs of different models and adapt to burning terminals of different positions and layouts.

Description

Technical Field

[0001] This application relates to the field of programming equipment technology, specifically to a programming fixture. Background Technology

[0002] During the production, development, and testing stages of electronic products, the written programs and parameters need to be burned into the memory of the PCBA (Printed Circuit Board Assembly). The burning fixture is an important auxiliary device in the burning process.

[0003] Programming fixtures typically program PCBAs by moving pins connected to programming cables and making electrical contact with programming terminals on the PCBA. Most existing programming fixtures are customized based on pre-developed PCBAs; that is, the position and layout of the pins on the fixture are set according to the position and layout of the programming terminals on the corresponding PCBA. This means that if the position and layout of the programming terminals change after a PCBA update, the original programming fixture cannot be used, requiring a new custom-designed fixture, which undoubtedly increases production costs. Utility Model Content

[0004] In view of the above problems, this application provides a programming fixture that is compatible with different PCBA models and adaptable to programming terminals in different positions and layouts.

[0005] This application provides a programming fixture, comprising: a base for placing a circuit board to be programmed; a pressing mechanism connected to the base, having a liftable pressing rod with a connector at the bottom end of the pressing rod; a retaining ring fitted onto the connector and rotatable relative to the connector in the circumferential direction to a predetermined angle and then fixed; a connecting arm slidably connected to the retaining ring in the horizontal direction and slidable relative to the retaining ring to a predetermined position and then fixed; and a pin in a vertical position connected to the connecting arm for electrically connecting programming signal lines and for making electrical contact with programming terminals on the circuit board when the pressing rod descends, so as to program the circuit board.

[0006] In one alternative embodiment, there are multiple retaining rings, connecting arms, and ejector pins, with at least one connecting arm connected to each retaining ring and at least one ejector pin connected to each connecting arm.

[0007] In one alternative embodiment, the retaining ring has two opposing free ends connected by an adjusting member; the adjusting member is used to release the retaining ring and allow it to rotate circumferentially relative to the connector when the two free ends are moved away from each other; the adjusting member is used to clamp and fix the retaining ring to the connector when the two free ends are brought closer together.

[0008] In one alternative embodiment, the retaining ring has a horizontally oriented insertion hole, into which the connecting arm can be slidably inserted; a locking element is movably provided on the retaining ring, the locking element having a crimping end that penetrates into the insertion hole; when the crimping end is separated from the connecting arm, the connecting arm can slide relative to the insertion hole; when the crimping end is pressed against the connecting arm, the connecting arm is fixed to the inner wall of the insertion hole.

[0009] In one alternative approach, a connecting hole is provided on the connecting arm along the vertical direction, and a pin is inserted into the connecting hole and can slide relative to the connecting hole to a predetermined height before being fixed.

[0010] In one alternative approach, the ejector pin is riveted to the inner wall of the connecting hole so that the ejector pin can be raised and lowered relative to the connecting hole to a predetermined height and then fixed.

[0011] In one alternative embodiment, the bottom end of the ejector pin has a resiliently retractable needle tip; the pressure rod is used to retract a predetermined distance after the needle tip makes electrical contact with the programming terminal on the circuit board during the process of driving the ejector pin down, so as to make the needle tip and the programming terminal form a resilient contact.

[0012] In one alternative embodiment, a first clamping block and a second clamping block are slidably disposed on the base along a first horizontal direction, and a third clamping block and a fourth clamping block are slidably disposed along a second horizontal direction perpendicular to the first horizontal direction; a first driving member is disposed on the base and connected to the first clamping block and the second clamping block, the first driving member being used to drive the first clamping block and the second clamping block to slide in order to clamp the circuit board in the first horizontal direction; a second driving member is disposed on the base and connected to the third clamping block and the fourth clamping block, the second driving member being used to drive the third clamping block and the fourth clamping block to slide in order to clamp the circuit board in the second horizontal direction.

[0013] In one alternative embodiment, a bracket is provided on the base, and the pressing mechanism further includes a mounting seat and a handle. The mounting seat is fixedly connected to the bracket. A guide seat is provided on the mounting seat, and the pressing rod passes through the guide seat in a vertical direction and can move up and down relative to the guide seat. The handle is movably connected to the mounting seat and is connected to the pressing rod to drive the pressing rod to move up and down.

[0014] In one alternative embodiment, the handle has a first segment and a second segment arranged at an angle to each other, with one end of the first segment facing away from the second segment rotatably connected to the mounting base; the pressing mechanism also includes a connecting rod, with the adjacent portion of the first and second segments hinged to one end of the connecting rod, and the top end of the pressing rod hinged to the other end of the connecting rod; the connecting rod is used to drive the pressing rod to move up and down when the second segment is subjected to force to rotate the handle relative to the mounting base.

[0015] In the programming fixture provided in this application embodiment, the retaining ring can drive the connecting arm and the ejector pin on it to rotate relative to the connector head to a predetermined angle and then fix them, thereby realizing the position adjustment of the ejector pin along the circumferential direction. At the same time, the connecting arm drives the ejector pin on it to translate relative to the retaining ring to a predetermined position and then fix them. With the ejector pin being able to adjust its position along the circumferential direction of the connector head and its distance from the connector head along the horizontal direction, the combination of these two kinematic pairs allows the ejector pin to be adjusted to any position on the horizontal plane, thereby allowing the ejector pin to be adjusted to a state corresponding to programming terminals in different positions or layouts, realizing the compatibility of the programming fixture with different types of circuit boards.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the programming fixture provided in the embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the programming fixture provided in this embodiment of the utility model, omitting the base;

[0020] Figure 3 A cross-sectional structural diagram of a retaining ring provided in an embodiment of this utility model;

[0021] Figure 4 This is a cross-sectional structural diagram of a retaining ring provided in another embodiment of the present invention.

[0022] The reference numerals in the detailed embodiments are as follows:

[0023] 100. Burning jig;

[0024] 110. Base; 111. Support;

[0025] 120. Pressing mechanism; 121. Pressing rod; 1211. Connector; 122. Mounting base; 1221. Guide seat; 123. Handle; 1231. First section; 1232. Second section; 124. Connecting rod;

[0026] 130. Snap ring; 131. Free end; 1311. Through hole; 1312. Threaded hole; 1321. Threaded fastener; 1322. Cam clamping mechanism; 13221. Connecting rod; 13222. Pressure block; 13223. Cam snap fastener; 133. Insertion hole; 134. Locking element; 1341. Locking bolt; 13411. First pressing end; 1342. Cam locking mechanism; 13421. Pressing rod; 134211. Second pressing end; 13422. Abutment block; 13423. Cam lock; 13424. Elastic element;

[0027] 140. Connecting arm; 141. Connecting hole;

[0028] 150. Threshold pin; 151. Needle tip;

[0029] 161. First clamping block; 162. Second clamping block; 163. Third clamping block; 164. Fourth clamping block;

[0030] 171. First driving component; 172. Second driving component. Detailed Implementation

[0031] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0033] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0036] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0037] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0039] Programming jigs, as auxiliary equipment for programming, make the programming process more convenient and efficient. Common programming jigs generally consist of a base plate for fixing the PCBA, a clamping mechanism, and a pressure plate fixed to the clamping mechanism. Pins corresponding to the programming terminals on the PCBA are embedded in the pressure plate. In use, the clamping mechanism is first operated to make electrical contact between the pins and the corresponding programming terminals, and then programming can begin.

[0040] When developing multiple products simultaneously, it is often necessary to burn the written programs and parameters onto different PCBA models to facilitate testing and debugging of the designed product's functions and performance. Due to the different product sizes and space layout requirements, the layout specifications (e.g., row spacing, column spacing), terminal size, quantity, and distribution position of the burned terminals on different PCBA models may vary significantly.

[0041] Traditional programming fixtures use clamping plates designed specifically for the programming terminal layout on corresponding PCBAs, meaning the clamping plate and PCBA model are one-to-one matched. This means that during multi-product development or product upgrades, using an incompatible clamping plate to program the PCBA can lead to issues. Incorrectly positioned programming pins on the clamping plate may scratch the PCBA, and the required terminals may lack corresponding ejector pins, preventing programming from proceeding. Therefore, to ensure smooth programming, new clamping plates or programming fixtures must be custom-made for each new PCBA, undoubtedly increasing production costs. Furthermore, for programming fixtures with replaceable clamping plates, the plate is typically fixed to the clamping mechanism with multiple screws, making plate replacement complex, cumbersome, and inefficient.

[0042] In view of the above problems, this application uses a position-adjustable component connected between the pressing mechanism and the ejector pin. By operating these position-adjustable components accordingly, the ejector pin can be adjusted to the corresponding position according to the layout of the programming terminals on different PCBA models, so as to achieve compatibility with different PCBA models and achieve the purpose of cost reduction and efficiency improvement.

[0043] Based on this, this application proposes a programming jig, please refer to the following for details. Figure 1 and Figure 2 , Figure 1 The structure of the programming fixture is shown in the figure. The programming fixture 100 includes: a base 110, a pressing mechanism 120, a retaining ring 130, a connecting arm 140, and a push pin 150. The base 110 is used to hold the circuit board to be programmed (i.e., the PCBA mentioned above, not shown in the figure). The pressing mechanism 120 is connected to the base 110 and has a liftable pressing rod 121.

[0044] The bottom end of the pressure rod 121 has a connector 1211, and a retaining ring 130 is sleeved on the connector 1211. The retaining ring 130 can rotate circumferentially relative to the connector 1211 to a predetermined angle and then be fixed.

[0045] Please refer to details. Figure 2 The figure shows the structure connecting the pressing mechanism 120, the retaining ring 130, the connecting arm 140, and the ejector pin 150. In the specific embodiment shown in the figure, the retaining ring 130 has two opposing free ends 131, which are connected by an adjusting member. The adjusting member can be... Figure 3The threaded fastener 1321 shown in the cross-sectional structure of the retaining ring 130 passes through the through hole 1311 on one of the free ends 131 and connects to the threaded hole 1312 on the other free end. When the threaded fastener 1321 is tightened to move the two free ends 131 away from each other, the retaining ring 130 is released and can rotate circumferentially relative to the connector 1211. Conversely, when the threaded fastener 1321 is tightened to move the two free ends 131 closer to each other, the retaining ring 130 clamps and fixes itself on the connector 1211, thereby achieving the goal of fixing the retaining ring 130 after it rotates to a predetermined angle relative to the connector 1211.

[0046] In addition, such as Figure 4 As shown in the cross-sectional structure, the adjusting component can also be a cam clamping mechanism 1322. The cam clamping mechanism 1322 includes a connecting rod 13221, a pressure block 13222, and a cam buckle 13223. The connecting rod 13221 passes through through holes with stepped surfaces on two free ends 131, and one end of the connecting rod 13221 has a protrusion that abuts against the stepped surface of one of the through holes. The pressure block 13222 is located in the other through hole and is sleeved on the connecting rod 13221. The other end of the connecting rod 13221 is rotatably connected to the cam buckle 13223. Figure 4 In the current state, the cam buckle 13223 is in the released state. At this time, the non-protruding surface on the cam is in contact with the pressure block 13222, the two free ends 131 are in a relatively far apart state, and the retaining ring 130 can rotate relative to the connector 1211. Figure 4 Based on this, after turning the cam buckle 13223 clockwise, the protruding surface on the cam will abut against the pressure block 13222 and drive the pressure block 13222 to move to the left, so that the two free ends 131 are close to each other, and the retaining ring 130 is locked and fixed to the connector 1211.

[0047] It should be noted that, in addition to the above-described embodiment where the two free ends 131 move relative to each other to clamp or loosen, the retaining ring 130 can be sleeved on the connector 1211 and rotated to a predetermined angle for fixation. Alternatively, a pin structure can be used. Specifically, the retaining ring 130 is an integral structure that is sleeved on the connector 1211 with a clearance fit, allowing the retaining ring 130 to rotate relative to the connector 1211. The connector 1211 has multiple fixing holes along its circumference, and the retaining ring 130 has multiple insertion holes along its circumference. After the retaining ring 130 rotates to the desired angle, the retaining ring 130 is fixed on the connector 1211 by sequentially inserting the pin into the insertion holes on the retaining ring 130 and the fixing holes on the connector 1211.

[0048] Please refer to it again. Figure 1 The connecting arm 140 is slidably connected to the retaining ring 130 in the horizontal direction, and can be fixed after sliding relative to the retaining ring 130 to a predetermined angle.

[0049] Please refer to it again. Figure 2 and Figure 3 In the specific embodiment shown in the figure, the retaining ring 130 has a horizontally oriented insertion hole 133, and the connecting arm 140 is slidably inserted into the insertion hole 133. A locking member 134 is movably disposed on the retaining ring 130, and the locking member 134 has a crimping end that inserts into the insertion hole 133. Specifically, the locking member 134 can be... Figure 3 The locking bolt 1341 shown is threaded onto and connected to the retaining ring 130. The locking bolt 1341 has a first crimping end 13411 that inserts into the insertion hole 133. When the locking bolt 1341 is tightened, causing the first crimping end 13411 to move away from the connecting arm 140 and separate from it, the connecting arm 140 is released and can slide relative to the insertion hole 133. When the locking bolt 1341 is tightened, causing the first crimping end 13411 to move towards and press against the connecting arm 140, the connecting arm 140 can be clamped and fixed in the insertion hole 133, thereby fixing the connecting arm 140 relative to the inner wall of the insertion hole 133.

[0050] Similarly, please refer to Figure 4 Locking components can also be used for Figure 4 The cam locking mechanism 1342 shown includes a pressing rod 13421, an abutment block 13422, a cam lock 13423, and an elastic element 13424. The pressing rod 13421 passes through the retaining ring 130 and has a second pressing end 134211 that passes through the insertion hole 133. The abutment block 13422 is sleeved on the pressing rod 13421 and abuts against the outer wall of the retaining ring 130. The cam lock 13423 is rotatably connected to one end of the outer side of the pressing rod 13421. The elastic element 13424 is inside the retaining ring 130 and sleeved on the pressing rod 13421. The elastic element 13424 abuts against the inner wall of the retaining ring 130 and the top of the second pressing end 134211, respectively, to provide elastic force to the pressing rod 13421 to move toward the connecting arm 140.

[0051] exist Figure 4 In the current state, the protruding surface of the cam on the cam latch 13423 abuts against the abutment block 13422. At this time, the cam latch 13423 causes the pressing rod 13421 to overcome the elastic force of the elastic element 13424 and be at its uppermost position. The second pressing end 134211 separates from the connecting arm 140, and the connecting arm 140 can slide in the insertion hole 133. When in Figure 4 After rotating the cam lock 13423 clockwise, the crimping rod 13421 moves toward the connecting arm 140 under the elastic force of the elastic element 13424, and the second crimping end 134211 presses against the connecting arm 140, thus fixing it to the inner wall of the insertion hole 133.

[0052] It should be noted that, in addition to Figure 3 and Figure 4 In addition to the method provided in the illustrated embodiment, the connecting arm 140 and the retaining ring 130 can also be slidably connected to each other through a sliding engagement mechanism such as a guide rail slider. Similarly, a pin can be inserted into both the connecting arm 140 and the retaining ring 130 to fix the connecting arm 140 relative to the retaining ring 130 after it slides to a predetermined position.

[0053] Please refer to it again. Figure 1 The ejector pin 150 is in a vertical position and connected to the connecting arm 140. For example... Figure 2 As shown, a connecting hole 141 can be vertically formed on the connecting arm 140. A ejector pin 150 is inserted into the connecting hole 141 and can be raised or lowered relative to the connecting hole 141 to a predetermined height before being fixed. Specifically, the ejector pin 150 can be riveted to the inner wall of the connecting hole 141 using an interference fit. A large force is applied to the ejector pin 150 to make it slide within the connecting hole 141, and after the force is applied, the friction between the inner wall of the connecting hole 141 and the ejector pin 150 keeps the ejector pin 150 at the predetermined height. Alternatively, pins can be inserted into both the connecting arm 140 and the ejector pin 150 to achieve the same fixation after the ejector pin 150 has been raised or lowered to the predetermined height.

[0054] During programming, the ejector pin 150 is used to connect to the programming signal line. By operating the pressure lever 121 to lower the ejector pin 150, it makes electrical contact with the programming terminal on the circuit board, and then programs the circuit board.

[0055] To ensure more reliable electrical contact between the ejector pin 150 and the programming terminal, and thus guarantee a higher programming success rate, as follows: Figure 2 As shown, the bottom end of the ejector pin 150 may have an elastically retractable needle head 151. The pressing rod 121 is used to retract the needle head 151 upward a predetermined distance after it makes electrical contact with the programming terminal on the circuit board during the process of driving the ejector pin 150 downward, so that the needle head 151 and the programming terminal form an elastic contact. In other words, the needle head 151 forms an interactive positive pressure with the programming terminal under the action of elastic force, thereby ensuring that the needle head 151 and the programming terminal are in close contact, ensuring the stability and reliability of current transmission, and providing a guarantee for successful programming.

[0056] In summary, in the programming fixture 100 provided in this application embodiment, the retaining ring 130 can drive the connecting arm 140 and the ejector pin 150 thereon to rotate relative to the connector 1211 to a predetermined angle and then fix them, thereby realizing the position adjustment of the ejector pin 150 along the circumferential direction. At the same time, the connecting arm 140 drives the ejector pin 150 thereon to translate relative to the retaining ring 130 to a predetermined position and then fix them. With the ejector pin 150 being able to adjust its position along the circumferential direction of the connector 1211 and its distance from the connector 1211 along the horizontal direction, the combination of these two kinematic pairs allows the ejector pin 150 to be adjusted to any position on the horizontal plane, thereby allowing the ejector pin 150 to be adjusted to a state corresponding to programming terminals in different positions or layouts, thus realizing the compatibility of the programming fixture 100 with different types of circuit boards.

[0057] Please refer to it again. Figure 1 and Figure 2 There can be multiple retaining rings 130, connecting arms 140, and ejector pins 150. Each retaining ring 130 can be connected to one or more connecting arms 140, and each connecting arm 140 can be connected to one or more ejector pins 150. The specific number of retaining rings 130, connecting arms 140, and ejector pins 150, the number of connecting arms 140 connected to one retaining ring 130, and the number of ejector pins 150 connected to one connecting arm 140 can all be adjusted according to the layout of the programming terminals on the circuit board to be programmed, provided that the hardware structure allows. No specific limitations are specified here.

[0058] Furthermore, considering the differences in size between different circuit boards, in order to stably fix circuit boards of different sizes on the base 110, this embodiment of the application further provides a circuit board clamp on the base 110. Please refer again for details. Figure 1 As shown in the figure, a first clamping block 161 and a second clamping block 162 are slidably disposed on the base 110 along a first horizontal direction (indicated by the double arrow X in the figure), and a third clamping block 163 and a fourth clamping block 164 are slidably disposed along a second horizontal direction perpendicular to the first horizontal direction (indicated by the double arrow Y in the figure). A first driving member 171 connected to the first clamping block 161 and the second clamping block 162 is disposed on the base 110. The first driving member 171 is used to drive the first clamping block 161 and the second clamping block 162 to slide, thereby clamping the circuit board in the direction indicated by the double arrow X. A second driving member 172 connected to the third clamping block 163 and the fourth clamping block 164 is disposed on the base 110. The second driving member 172 is used to drive the third clamping block 163 and the fourth clamping block 164 to slide, thereby clamping the circuit board in the direction indicated by the double arrow Y, thus clamping and fixing the circuit board around its perimeter.

[0059] Specifically, in Figure 1In the specific embodiment shown, both the first clamping block 161 and the second clamping block 162 are disposed through the base 110. The first driving member 171 is a screw with bidirectional threads, which enters the base 110 from the side. One helical thread on the screw engages with the first clamping block 161 inside the base 110, and the other helical thread engages with the second clamping block 162 inside the base 110. This achieves the effect that when the screw is rotated, the first clamping block 161 and the second clamping block 162 move synchronously towards each other or away from each other. The third clamping block 163, the fourth clamping block 164, and the second driving member 172 are handled similarly, thereby achieving the effect that the first clamping block 161, the second clamping block 162, the third clamping block 163, and the fourth clamping block 164 move from four directions toward the center point to clamp the circuit board.

[0060] In addition to the above embodiments, the first driving member 171 may also be two screws, which are respectively connected to the first clamping block 161 and the second clamping block 162 to realize the individual sliding adjustment of the first clamping block 161 and the second clamping block 162. The sliding adjustment of the second driving member 172 to the third clamping block 163 and the fourth clamping block 164 is similar.

[0061] Alternatively, the first driving member 171 can also be an elastic member, which can be connected between the first clamping block 161 and the second clamping block 162, and in the default state, pulls the first clamping block 161 and the second clamping block 162 closer together and tightens them. Of course, multiple elastic members can also be used, respectively connected between the base 110 and the first clamping block 161 and between the base 110 and the second clamping block 162, and in the default state, press the first clamping block 161 and the second clamping block 162 closer together and tighten them. When fixing the circuit board, the first clamping block 161 and the second clamping block 162 are first spread apart, and then the circuit board is placed between the first clamping block 161 and the second clamping block 162. Under the elastic force of the elastic member, the first clamping block 161 and the second clamping block 162 tend to move closer together, thereby reliably clamping and fixing the circuit board. The third clamping block 163, the fourth clamping block 164, and the second driving member 172 work in the same way, so that after the first clamping block 161, the second clamping block 162, the third clamping block 163, and the fourth clamping block 164 move from the center point and move in four directions respectively, they clamp and fix the circuit board placed in the middle under the action of the elastic member.

[0062] Of course, in addition to using a screw, the first drive component 171 and the second drive component 172 can also use a manual push rod or an electric push rod, etc., and the specifics are not limited here.

[0063] Regarding the specific structure of the pressing mechanism 120, this application proposes one implementation method, please refer again for details. Figure 1 and Figure 2The base 110 is provided with a bracket 111. The pressing mechanism 120 also includes a mounting base 122 and a handle 123. The mounting base 122 is fixedly connected to the bracket 111. The mounting base 122 is provided with a guide seat 1221. The pressing rod 121 passes through the guide seat 1221 in a vertical direction and can move up and down relative to the guide seat 1221. The handle 123 is movably connected to the mounting base 122 and is connected to the pressing rod 121 to drive the pressing rod 121 to move up and down.

[0064] In this embodiment, the pressing mechanism 120 is configured with an independent mounting base 122, and the pressing rod 121 and handle 123 are assembled on the mounting base 122, so that the pressing mechanism 120 forms an independent mounting module. During assembly, the pressing mechanism 120 can be assembled first, and then the mounting base 122 can be assembled on the bracket 111 of the base 110 to fix the pressing mechanism 120 on the base 110. This method makes the pressing mechanism 120 modularly assembled, which facilitates the assembly operation of the burning jig 100 and helps to improve assembly efficiency.

[0065] For information on the operation of the handle 123 on the downward lever 121, please refer to [link / reference needed]. Figure 2 In the specific embodiment shown in the figure, the handle 123 has a first segment 1231 and a second segment 1232 arranged at an angle to each other. One end of the first segment 1231 facing away from the second segment 1232 is rotatably connected to the mounting base 122. The pressing mechanism 120 also includes a connecting rod 124. The adjacent part of the first segment 1231 and the second segment 1232 is hinged to one end of the connecting rod 124, and the top end of the pressing rod 121 is hinged to the other end of the connecting rod 124. The technician performing the burning operation can hold the second segment 1232 with his hand and apply force to make the handle 123 rotate relative to the mounting base 122. During the rotation of the handle 123, the height of the hinge point A between the handle 123 and the connecting rod 124 will change. Correspondingly, under the restriction of the lifting direction of the pressing rod 121 by the guide seat 1221, the height change of the hinge point A will be transmitted to the hinge point B through the rotation of the two ends of the connecting rod 124, so that the height of the hinge point B will change accordingly, thereby realizing the driving operation of lifting the pressing rod 121.

[0066] exist Figure 2 At the angle shown, when the second segment 1232 of the handle 123 is pulled counterclockwise, the height of the hinge point A decreases, and the pressure rod 121 decreases accordingly, so that the ejector pin 150 makes electrical contact with the programming terminal. When the second segment 1232 of the handle 123 is pushed clockwise, the height of the hinge point A increases, and the pressure rod 121 rises accordingly, so that the ejector pin 150 separates from the programming terminal.

[0067] Preferably, the first segment 1231 and the second segment 1232 can be as follows: Figure 2The perpendicular arrangement shown makes it easier and less strenuous to rotate the second segment 1232 by applying force to it.

[0068] It is understood that, in addition to the driving method of the handle 123 to the pressing rod 121 provided in the above embodiments, the handle 123 can also be slidably connected to the mounting base 122, and the handle 123 can be fixedly connected to the pressing rod 121 so that the pressing rod 121 can be driven to move up and down by pulling the handle 123 upward or pushing it downward. Of course, the handle 123 and the pressing rod 121 can also be connected by some existing transmission mechanisms to realize the lifting and lowering driving operation of the handle 123 to the pressing rod 121.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A burn-in fixture, comprising: The utility model relates to a circuit board burning device, which comprises: a base for placing a circuit board to be burned; a pressing mechanism connected to the base and having a lifting pressing rod with a connecting head at the bottom end; a clamping ring sleeved on the connecting head and rotatable to a predetermined angle relative to the connecting head and then fixed; a connecting arm slidably connected to the clamping ring in the horizontal direction and slidable to a predetermined position relative to the clamping ring and then fixed; and a vertical top pin connected to the connecting arm and used for electrically connecting a burning signal line and electrically contacting a burning terminal on the circuit board when the pressing rod is lowered to burn the circuit board. The clamping ring, the connecting arm and the top pin are all multiple, each clamping ring is connected with at least one connecting arm, and each connecting arm is connected with at least one top pin.

2. The burn-in fixture of claim 1, wherein The clamping ring has two opposite free ends connected by an adjusting piece; 3. The burn-in fixture of claim 1, wherein When the two free ends are away from each other, the clamping ring is loosened and can rotate relative to the connecting head; When the two free ends are close to each other, the clamping ring is clamped and fixed on the connecting head. A plug-in hole is formed in the clamping ring in the horizontal direction, and the connecting arm is slidably inserted into the plug-in hole; 4. The burn-in fixture of claim 1, wherein A locking piece is movably arranged on the clamping ring, and the locking piece has a pressure contact end penetrating into the plug-in hole; When the pressure contact end is separated from the connecting arm, the connecting arm can slide relative to the plug-in hole; When the pressure contact end is pressed on the connecting arm, the connecting arm is fixed to the inner wall of the plug-in hole. A connecting hole is formed in the connecting arm in the vertical direction, and the top pin is inserted into the connecting hole and can slide to a predetermined height relative to the connecting hole and then be fixed.

5. The burn-in fixture of claim 1, wherein The top pin is riveted to the inner wall of the connecting hole, so that the top pin can be lifted to a predetermined height relative to the connecting hole and then be fixed.

6. The burn-in fixture of claim 5, wherein, The bottom end of the top pin has an elastically expandable needle; 7. The burn-in fixture of claim 1, wherein The pressing rod is used to make the needle retract a predetermined distance after electrically contacting the burning terminal on the circuit board during the process of lowering the top pin, so that the needle and the burning terminal form an elastic contact. First and second clamping blocks are slidably arranged on the base in a first horizontal direction, and third and fourth clamping blocks are slidably arranged on the base in a second horizontal direction perpendicular to the first horizontal direction; 8. The burn-in fixture of claim 1, wherein, The base is provided with a first driving piece connected to the first and second clamping blocks, and the first driving piece is used to drive the first and second clamping blocks to slide to clamp the circuit board in the first horizontal direction; The base is provided with a second driving piece connected to the third and fourth clamping blocks, and the second driving piece is used to drive the third and fourth clamping blocks to slide to clamp the circuit board in the second horizontal direction. The base is provided with a support, and the pressing mechanism further comprises a mounting seat and a handle, and the mounting seat is fixedly connected to the support; 9. The burn-in fixture of claim 1, wherein, The mounting seat is provided with a guide seat, and the pressing rod penetrates through the guide seat in the vertical direction and can move up and down relative to the guide seat; ​ The handle is movably connected to the mounting base, and the handle is connected to the pressing rod to drive the pressing rod to move up and down.

10. The burn-in fixture of claim 9, wherein, The handle has a first section and a second section arranged at an angle to each other, and an end of the first section away from the second section is rotatably connected to the mounting base. The pressing mechanism further comprises a connecting rod, and an abutting portion of the first section and the second section is hingedly connected to one end of the connecting rod, and a top end of the pressing rod is hingedly connected to the other end of the connecting rod. The connecting rod is used to drive the pressing rod to move up and down when the second section is forced to make the handle rotate relative to the mounting base.

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