Flexible clamping jig for testing automobile PCB (Printed Circuit Board)

Abstract

The invention discloses an automobile PCB test flexible clamping jig, and relates to the technical field of PCB testing, the automobile PCB test flexible clamping jig comprises a base, the middle of the top of the base is fixedly connected with a placing table used for placing a circuit board, the placing table is internally and fixedly connected with electric push rods symmetrically distributed along the placing table, and the electric push rods are fixedly connected with the base. The base is fixedly connected with first guide rails symmetrically distributed along the base, sliding frames symmetrically distributed along the containing table are slidably connected between the symmetrically-distributed first guide rails, and the output ends of the electric push rods are fixedly connected with the sliding frames. The adjusting plate driven by the motor is arranged in the runner pipe, the distribution proportion of the hydraulic medium to the branch hydraulic bags is controlled, differential clamping force is applied to different areas (such as the front portion and the rear portion) of the circuit board, the process requirements that a golden finger area needs high voltage, a line dense area needs low voltage and the like are met, and the clamping accuracy and the process adaptability are improved.

Description

Technical Field

[0001] This invention relates to the technical field of PCB circuit board testing, and more particularly to a flexible clamping fixture for testing automotive PCB circuit boards. Background Technology

[0002] In the field of smart chip technology, PCB circuit boards provide pads, traces, vias, and other structures for smart chips, used to fix the chips and connect them to the entire circuit system. During the testing and assembly of these precision electronic modules, PCBs require stable clamping of the workpiece.

[0003] Existing flexible clamping devices are mostly based on the principle of overall pressurization, which can only provide uniform pressure and cannot meet the differentiated clamping needs of different areas. For example, in the reinforcement bonding process of intelligent integrated circuits, functional areas require high pressure to ensure connection strength, while sensitive circuit areas require low-pressure protection. In addition, when there are assembly deviations or deformations in the workpiece, the existing structure lacks adaptive adjustment capabilities, which can easily lead to poor contact or local overpressure.

[0004] Therefore, there is an urgent need for a flexible clamping fixture for testing automotive PCB circuit boards that can be zoned and adjusted in voltage and has dynamic balancing capabilities, in order to improve the accuracy, safety and process compatibility of the workpiece testing process. Summary of the Invention

[0005] In order to overcome the shortcomings mentioned in the background art, the present invention provides a flexible clamping fixture for testing automotive PCB circuit boards.

[0006] A flexible clamping fixture for testing automotive PCB circuit boards includes a base, a placement platform for placing the circuit board fixedly connected to the top center of the base, electric push rods symmetrically distributed along the placement platform fixedly connected inside the placement platform, first guide rails symmetrically distributed along the base fixedly connected to the base, sliding frames symmetrically distributed along the placement platform slidably connected between the symmetrically distributed first guide rails, the output end of the electric push rods fixedly connected to the sliding frames, hydraulic bladders provided on the sliding frames for clamping the circuit board, rigid flow tubes fixedly connected between the hydraulic bladders on the same side, a motor fixedly connected to the center of the sliding frames, and an adjusting plate fixedly connected to the output shaft of the motor, the adjusting plate being located inside the adjacent flow tubes.

[0007] As an improvement to the above solution, the electric actuator is configured as a double-headed type.

[0008] As an improvement to the above solution, it also includes fixed tubes symmetrically distributed along the sliding frame, the fixed tubes communicating with adjacent hydraulic bladders, sleeves provided on the fixed tubes, contact switches fixedly connected to the outer side of the fixed hydraulic bladders, piston rods slidably connected inside the fixed tubes, connecting rods fixedly connected to the piston rods, connecting rods slidably connected to the sleeves, contact frames fixedly connected to the connecting rods, contact frames contacting adjacent contact switches, springs wound around the connecting rods, one end of the springs fixedly connected to adjacent piston rods, and the other end contacting the inner side of the end of adjacent sleeves, and warning lights symmetrically distributed along the sliding frame fixedly connected to the sliding frame.

[0009] As an improvement to the above solution, the contact switch is electrically connected to the warning light through a control module.

[0010] As an improvement to the above solution, a second guide rail is fixedly connected inside the fixed tube, and the piston rod is slidably connected to the adjacent second guide rail.

[0011] As an improvement to the above solution, the contact frame is configured in a Z-shape.

[0012] As an improvement to the above solution, the sleeve is threadedly connected to the adjacent fixed pipe via a threaded groove.

[0013] As an improvement to the above solution, a gear is fixedly connected to the sleeve, a push rod is fixedly connected to the adjusting plate, a third guide rail symmetrically distributed along the sliding frame is fixedly connected to the sliding frame, and a rack frame is slidably connected between adjacent third guide rails, with the tooth surface of the rack frame meshing with the adjacent gear.

[0014] The beneficial effects of this invention are as follows: This invention uses an adjustment plate driven by a motor inside the flow tube to control the distribution ratio of hydraulic medium to each branch hydraulic bladder, thereby applying differentiated clamping forces to different areas of the circuit board (such as the front and rear), meeting process requirements such as high voltage for the gold finger area and low voltage for dense circuit areas, and improving clamping accuracy and process adaptability.

[0015] This invention employs a distributed layout of multiple hydraulic bladders, combined with the deflection control of the adjustment plate. It can also dynamically adjust the pressure distribution between the two sides and the area when the workpiece has uneven thickness or assembly misalignment, avoiding local overpressure or poor contact, and ensuring uniform and reliable clamping contact.

[0016] This invention, through the setting of a hydraulic linkage monitoring mechanism consisting of a piston rod, spring, contact frame, and contact switch, can judge the status of the hydraulic system in real time during clamping. If there is a serious leak or pressure loss during clamping, the spring resets and the contact frame touches the switch again to trigger an alarm. If there is a serious leak before clamping, the alarm will be triggered before the switch is disconnected after a delay. This dual detection mechanism covers both "pre-leak" and "intermediate leak" to ensure that operators can be promptly alerted to stop testing and begin maintenance under any serious leakage conditions, effectively avoiding test failures caused by insufficient clamping force.

[0017] This invention achieves synchronous dynamic adjustment of spring preload by adjusting the linkage between the rack and pinion frame, gear, and sleeve mechanism. On the side where the clamping force is reduced, the corresponding spring is simultaneously loosened to ensure that the contact frame can still disengage from the contact switch; at the same time, the spring on the other side is tightened to enhance the clamping response and achieve dynamic matching between the clamping pressure and the alarm threshold to prevent false triggering. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a three-dimensional structural diagram of the components of the present invention, including the placement platform, electric push rod, and first guide rail.

[0020] Figure 3 This is a three-dimensional structural diagram of the hydraulic bladder, flow pipe, and regulating plate of the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the sleeve, contact switch, and warning light components of the present invention.

[0022] Figure 5 This is a three-dimensional structural diagram of the second guide rail, contact frame, and spring components of the present invention.

[0023] Figure 6 This is a three-dimensional structural diagram of the push rod and rack frame components of the present invention.

[0024] Figure 7 This is a three-dimensional structural diagram of the gear, push rod, and third guide rail components of the present invention.

[0025] The following are the names of the components labeled in the diagram: 101, base; 102, placement platform; 1021, electric push rod; 1022, circuit board; 103, first guide rail; 104, sliding frame; 105, hydraulic bladder; 106, flow pipe; 107, motor; 108, adjusting plate; 201, fixing pipe; 202, sleeve; 203, contact switch; 204, piston rod; 205, connecting rod; 206, second guide rail; 207, contact frame; 208, spring; 209, threaded groove; 210, warning light; 301, gear; 302, push rod; 303, third guide rail; 304, rack and pinion. Detailed Implementation

[0026] The above-described solution will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. The implementation conditions used in the embodiments may be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are generally those in routine experiments.

[0027] Example 1: Flexible clamping fixture for testing automotive PCB circuit boards, such as Figures 1-3 As shown, it includes a base 101, and a placement platform 102 for placing a circuit board 1022 is fixedly connected to the top center of the base 101. Electric push rods 1021, which are symmetrically distributed along the front and back of the placement platform 102, are fixedly connected inside the placement platform 102. They are configured as double-headed. A first guide rail 103 symmetrically distributed along the front and back of the base 101 is fixedly connected to the top of the base 101. A sliding frame 104 symmetrically distributed along the front and back of the placement platform 102 is laterally slidably connected between the first guide rails 103. The output end of the electric push rod 1021 is fixedly connected to the sliding frame 104. A hydraulic bladder 105 is provided on the upper part of the sliding frame 104 for holding the circuit board 1022. A rigid flow pipe 106 is fixedly connected between the hydraulic bladders 105 on the same side. The flow pipe 106 is provided with two branches, front and back. The intersection of the two branches is set as the main branch for inputting hydraulic medium. The hydraulic medium is preferably hydraulic oil. A motor 107 is fixedly connected in the middle of the sliding frame 104. An adjusting plate 108 is fixedly connected to the output shaft of the motor 107. The adjusting plate 108 is located in the main branch of the adjacent flow pipe 106 and is used to regulate the flow rate of the hydraulic medium entering the front and back branches.

[0028] Working principle: First, the circuit board 1022 is positioned on the placement platform 102. Then, the electric push rod 1021 is activated, causing the sliding frames 104 on the left and right sides to slide synchronously towards the center along the first guide rail 103. The sliding frames 104 drive the hydraulic bladders 105, flow pipes 106, motors 107, and adjusting plates 108 on them to move synchronously towards the center until the hydraulic bladders 105 are close to the side of the circuit board 1022. Then, the motor 107 is activated, and the output shaft of the motor 107 drives the adjusting plate 108 to deflect. Hydraulic medium is then introduced into the main branch of the flow pipe 106. The hydraulic medium flows into each hydraulic bladder 105 through each branch of the flow pipe 106. The hydraulic bladders 105 expand and contact the side of the circuit board 1022, applying pressure to it to achieve flexible clamping test.

[0029] During the above process, if the front of the left and right sides of the circuit board 1022 requires relatively light clamping and the rear requires relatively heavy clamping, the adjusting plate 108 is controlled to deflect clockwise, causing more hydraulic medium to flow into the rear branch of the flow pipe 106 and less into the front branch. This allows the front hydraulic bladder 105 to lightly clamp the front side and the rear hydraulic bladder 105 to heavily clamp the rear side. Conversely, the adjusting plate 108 is controlled to deflect counterclockwise.

[0030] In summary, by setting an adjustment plate 108 driven by a motor 107 inside the flow pipe 106, the present invention controls the distribution ratio of hydraulic medium to each branch hydraulic bladder 105, thereby applying differentiated clamping force to different areas of the circuit board 1022 (such as the front and rear), meeting the process requirements such as high voltage required in the gold finger area and low voltage required in the dense circuit area, and improving the clamping accuracy and process adaptability.

[0031] Meanwhile, the present invention adopts a distributed layout of multiple hydraulic bladders 105, combined with the deflection control of the adjustment plate 108, which can also dynamically adjust the pressure distribution between the two sides and the area when the workpiece has uneven thickness or assembly offset, so as to avoid local overpressure or poor contact and ensure uniform and reliable clamping contact.

[0032] Example 2: Based on Example 1, such as Figure 4 and Figure 5 As shown, it also includes fixed tubes 201 symmetrically distributed along the front and rear of the sliding frame 104. The fixed tubes 201 are connected to the adjacent hydraulic bladder 105. A sleeve 202 is threadedly connected to the fixed tubes 201 through a threaded groove 209. A contact switch 203 is fixedly connected to the outer side of the fixed hydraulic bladder 105. A piston rod 204 is slidably connected to the inside of the fixed tubes 201 in the left and right direction. A connecting rod 205 is fixedly connected to the piston rod 204. The connecting rod 205 is slidably connected to the sleeve 202. A second guide rail 206 is fixedly connected to the inside of the fixed tubes 201. The piston rod 204 is connected to the adjacent... The second guide rail 206 is slidably connected. A Z-shaped contact frame 207 is fixedly connected to one end of the connecting rod 205 away from the adjacent piston rod 204. The contact frame 207 contacts the adjacent contact switch 203. A spring 208 is wound around the connecting rod 205. One end of the spring 208 is fixedly connected to the adjacent piston rod 204, and the other end contacts the inner side of the end of the adjacent sleeve 202. A warning light 210 is fixedly connected to the top of the sliding frame 104 and symmetrically distributed along the front and back of the sliding frame 104. The contact switch 203 is electrically connected to the warning light 210 through the control module.

[0033] Hydraulic medium in the hydraulic bladder 105 flows into the fixed pipe 201, and the hydraulic pressure pushes the piston rod 204 to slide along the second guide rail 206. The spring 208 is compressed, and the piston rod 204 drives the contact frame 207 to move away from the contact switch 203 via the connecting rod 205. If the hydraulic medium pipeline system leaks severely during the clamping process, causing the hydraulic pressure in the hydraulic bladder 105 to be insufficient to clamp the circuit board 1022, the spring 208 will reset, causing the piston rod 204 to slide back to reset. The piston rod 204 drives the contact frame 207 to move closer to the contact switch 203 via the connecting rod 205. When the contact frame 207 contacts the contact switch 203, the contact switch 203 sends an electrical signal. The control module receives the electrical signal and controls the warning light 210 to flash an alarm.

[0034] If the hydraulic medium circulation pipeline system has already experienced a serious leak before clamping, resulting in insufficient hydraulic pressure in the hydraulic bladder 105 to clamp the circuit board 1022, then the hydraulic action is insufficient to disengage the contact frame 207 from the contact switch 203, causing the contact switch 203 to remain in contact with the contact frame 207 even after being energized for ten seconds. At this time, the contact switch 203 sends an electrical signal, the control module receives the electrical signal, and controls the warning light 210 to flash an alarm.

[0035] In summary, this invention, by setting up a hydraulic linkage monitoring mechanism consisting of a piston rod 204, a spring 208, a contact frame 207, and a contact switch 203, can judge the status of the hydraulic system in real time during clamping. If there is a serious leak or pressure loss during clamping, the spring 208 resets, causing the contact frame 207 to touch the switch again to trigger an alarm. If there is a serious leak before clamping, the switch will trigger an alarm before it is disconnected after a delay. This dual detection mechanism covers both "pre-leakage" and "intermediate leakage," ensuring that operators can be promptly alerted to stop testing and begin maintenance under any serious leakage conditions, effectively avoiding test failures caused by insufficient clamping force.

[0036] like Figure 6 and Figure 7 As shown, a gear 301 is fixedly connected to the sleeve 202, a push rod 302 is fixedly connected to the adjusting plate 108, and third guide rails 303 symmetrically distributed along the upper and lower parts of the sliding frame 104 are fixedly connected to both the front and rear parts of the sliding frame 104. A rack frame 304 is slidably connected between two adjacent upper and lower third guide rails 303 in the front and rear direction. The tooth surface of the rack frame 304 is located on the upper side and meshes with the adjacent gear 301.

[0037] During the above process, if the clamping force on either side is reduced, the hydraulic pressure on that side will decrease. This may result in the contact switch 203 remaining in contact with the contact bracket 207 even after being energized for ten seconds, potentially causing the warning light 210 on that side to trigger a false alarm. To reduce the occurrence of such phenomena, the tension of the spring 208 needs to be dynamically adjusted according to the change in clamping force. The specific operation is as follows: Taking the clockwise rotation of the adjusting plate 108 to reduce the clamping force on the front side of the circuit board 1022 as an example, the adjusting plate 108 drives the push rod 302 to rotate clockwise synchronously, thereby causing the two adjacent rack frames 304 to slide along the third guide rail 303 to the side away from each other. The front rack frame 304 drives the front gear 301 to rotate counterclockwise, thereby causing the front sleeve 202 to rotate counterclockwise. Under the guidance of the threaded groove 209, the front sleeve 202 moves away from the spring 208 while rotating counterclockwise, thereby loosening the tension of the front spring 208. In this way, the front piston rod 204 is more easily subjected to hydraulic pressure, and thus it is easier to drive the front contact frame 207 to disengage from the front contact switch 203 through the connecting rod 205, thereby preventing the situation where the front contact switch 203 is still in contact with the contact frame 207 after being energized for ten seconds.

[0038] At the same time, the rack frame 304 on the rear side drives the gear 301 on the rear side to rotate clockwise, thereby driving the sleeve 202 on the rear side to rotate clockwise. Under the guidance of the threaded groove 209, the sleeve 202 on the rear side moves closer to the spring 208 while rotating clockwise, thereby adjusting the tension of the spring 208 on the rear side. In this way, the piston rod 204 on the front side is more difficult to move under the hydraulic action, and the hydraulic medium is more difficult to enter the fixed tube 201. The hydraulic action is entirely applied to the hydraulic bladder 105 on the rear side, making the hydraulic bladder 105 on the rear side clamp the circuit board 1022 more tightly.

[0039] In summary, to address the problem of false alarms triggered by the monitoring mechanism due to actively reducing the clamping force, this invention uses the linkage mechanism of the adjusting plate 108 with the rack and pinion 304-gear 301-sleeve 202 to achieve synchronous dynamic adjustment of the preload of the spring 208. On the side where the clamping force is reduced, the corresponding spring 208 is simultaneously loosened to ensure that the contact frame 207 can still disengage from the contact switch 203; at the same time, the spring 208 on the other side is tightened to enhance the clamping response, achieve dynamic matching between the clamping pressure and the alarm threshold, and prevent false triggering.

[0040] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An automobile PCB circuit board test flexible clamping jig, comprising a base (101), a placement table (102) for placing a circuit board (1022) is fixed in the middle of the top of the base (101), a plurality of electric push rods (1021) are fixed in the placement table (102) and symmetrically distributed along the placement table (102), and a plurality of first guide rails (103) are fixed on the base (101) and symmetrically distributed along the base (101); characterized in that a plurality of sliding frames (104) are slidably connected between the symmetrically distributed first guide rails (103) and symmetrically distributed along the placement table (102), the output ends of the electric push rods (1021) are fixed to the sliding frames (104), hydraulic capsules (105) are arranged on the sliding frames (104) and used for clamping the circuit board (1022), hard flow pipes (106) are fixed between the hydraulic capsules (105) on the same side, a motor (107) is fixed in the middle of the sliding frame (104), an adjusting plate (108) is fixed to the output shaft of the motor (107), and the adjusting plate (108) is located in the adjacent flow pipe (106).

2. The flexible clamping fixture for testing an automotive PCB circuit board of claim 1, wherein: The electric push rod (1021) is provided in a double-head type.

3. The flexible clamping fixture for testing an automotive PCB circuit board of claim 2, wherein: A plurality of fixed pipes (201) are further fixed symmetrically along the sliding frame (104), the fixed pipes (201) are in communication with the adjacent hydraulic capsules (105), sleeves (202) are arranged on the fixed pipes (201), contact switches (203) are fixed to the outer sides of the hydraulic capsules (105), piston rods (204) are slidably connected in the fixed pipes (201), connecting rods (205) are fixed to the piston rods (204), the connecting rods (205) are slidably connected to the sleeves (202), contact frames (207) are fixed to the connecting rods (205), the contact frames (207) are in contact with the adjacent contact switches (203), springs (208) are wound around the connecting rods (205), one end of each spring (208) is fixed to the adjacent piston rod (204), and the other end of each spring (208) is in contact with the inner side of the end of the adjacent sleeve (202), and warning lights (210) are fixed to the sliding frame (104) and symmetrically distributed along the sliding frame (104).

4. The flexible clamping fixture for testing an automotive PCB circuit board of claim 3, wherein: The contact switches (203) are electrically connected to the warning lights (210) through a control module.

5. The flexible clamping fixture for testing an automotive PCB circuit board of claim 4, wherein: Second guide rails (206) are fixed in the fixed pipes (201), and the piston rods (204) are slidably connected to the adjacent second guide rails (206).

6. The flexible clamping fixture for testing an automotive PCB circuit board of claim 5, wherein: The contact frame (207) is provided in a Z-shaped type.

7. The flexible clamping fixture for testing an automotive PCB circuit board of claim 6, wherein: The sleeve (202) and the adjacent fixed pipe (201) are threadedly connected through a threaded groove (209). The contact frame (207) is provided in a Z-shaped type. The sleeve (202) and the adjacent fixed pipe (201) are threadedly connected through a threaded groove (209).

8. The flexible clamping fixture for testing an automotive PCB circuit board of claim 7, wherein: A gear (301) is fixed on the sleeve (202), a push rod (302) is fixed on the adjusting plate (108), a third guide rail (303) is fixed on the sliding frame (104) and symmetrically distributed along the sliding frame (104), a rack frame (304) is slidably connected between adjacent third guide rails (303), and the tooth surface of the rack frame (304) is engaged with adjacent gears (301).

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