Auxiliary clamp for circuit board detection

Abstract

The utility model relates to an auxiliary clamp, in particular to an auxiliary clamp for circuit board detection. Comprising a base plate, a mounting seat, a reserved notch, a negative pressure joint, a negative pressure interface and the like, mounting seats are symmetrically arranged on the left side and the right side of the lower portion of the base plate, a plurality of reserved notches are evenly formed in the front side and the rear side of the base plate at intervals, the heights of the tops of the base plate are consistent, negative-pressure connectors are formed in the four corners and the middle of the base plate, and negative-pressure connectors are connected to the lower ends of the negative-pressure connectors. By arranging the negative pressure mechanism, when a circuit board is placed on the clamp, the circuit board is rapidly fixed through the negative pressure mechanism, compared with a conventional mechanical clamping clamp, when the circuit board is fastened, friction and loss to the circuit board and the clamp are small, and stable performance can be kept in long-time use; and meanwhile, when the circuit board is taken and placed, the operation is simple and convenient, and the production efficiency can be effectively improved.

Description

Technical Field

[0001] The utility model relates to an auxiliary fixture, in particular to an auxiliary fixture for circuit board detection. Background Art

[0002] Circuit board fixtures, especially PCBA test fixtures, play a vital role in electronics manufacturing services. They are primarily used to secure and accurately and repeatedly position PCBs for various tests such as functional testing, power calibration, and life testing.

[0003] Common circuit board fixtures are roughly divided into two types. One is to place the circuit board flat on the fixture tooling, through fixed clamping blocks or customized grooves of the cardboard tooling; there is a kind of fixture with adjustable clamping blocks or cardboard structure that can fix the circuit board on the fixture. However, during the inspection process, according to the processing needs, the fixture carrying the circuit board will directly participate in the processing link, and the inspection of certain functions requires direct contact between the circuit board and the inspection mechanism. The applied force will cause the circuit board to shake, and the hard contact between the circuit board and the cardboard tooling will easily cause the circuit board to break. Imperceptible damage may occur on the board, causing damage to the circuit board. When double-sided inspection of the circuit board is required, the circuit board is stuck in the fixture, and it is necessary to manually remove the circuit board from the fixture and re-fix it. Frequent removal and placement of the board is more likely to cause damage to the circuit board and have a significant impact on the quality of the circuit board. Another type of fixture is to place the circuit board on the fixture without fixing it. When installing and placing the circuit board, there is no relative fixed structure. The circuit board is easy to slip out of the fixture after moving or tilting, which can easily cause inspection interruption. Utility Model Content

[0004] In order to overcome the problems of existing circuit board fixtures, one is a card board structure. In the detection of certain functions, the circuit board needs to be in direct contact with the detection mechanism. The applied force will cause the circuit board to shake. The hard contact between the circuit board and the card board tooling can easily lead to subtle damage to the circuit board card, thereby causing damage to the circuit board. When double-sided detection of the circuit board is required, the circuit board is stuck on the fixture, and it is necessary to manually remove the circuit board from the fixture repeatedly and re-fix it. Frequent removal and placement of the board is more likely to cause damage to the circuit board, which has a significant impact on the quality of the circuit board. Another type of fixture is to place the circuit board on the fixture without fixing it. When installing and placing the circuit board, due to the lack of a relative fixed structure, the circuit board is easy to slide out of the fixture after moving or tilting, which can easily cause detection interruption. The existing detection fixtures all have certain defects and shortcomings that affect processing. The purpose of the utility model is to provide an auxiliary fixture for circuit board detection that is in flexible contact with the circuit board and can quickly fix the circuit board.

[0005] The technical implementation scheme of the utility model is: an auxiliary fixture for circuit board testing, including a pad, a mounting seat, a reserved notch, a negative pressure joint and a negative pressure interface, the mounting seats are symmetrically provided on the left and right sides of the lower part of the pad, a number of reserved notches are evenly spaced on the front and back sides of the pad, negative pressure interfaces are provided at the four corners of the pad and the middle of the pad, and the lower ends of the negative pressure interfaces are connected to negative pressure joints.

[0006] As an optimal technical solution of the present invention, it also includes flexible protrusions, a plurality of grooves are opened on the upper part of the pad, a plurality of flexible protrusions are arranged in the grooves, the flexible protrusions are evenly distributed around the pad, and the flexible protrusions are hemispherical, and their tops are slightly higher than the top height of the pad.

[0007] As an optimal technical solution of the utility model, it also includes a positioning frame, which is slidably provided on the front of the pad, and the rear of the positioning frame penetrates into the pad, and the friction between the penetrated part and the pad is relatively large, and a strip-shaped protrusion is provided on the front of the positioning frame.

[0008] As an optimal technical solution of the utility model, it also includes a base and an electric cylinder. Electric cylinders are provided on the left and right sides of the base. The pad is installed between the two electric cylinders through a mounting base. The mounting base is screwed to the screw rod of the electric cylinder, and the pad is driven to move back and forth up and down through the electric cylinder.

[0009] As an optimal technical solution of the present invention, it also includes a fixed seat, a motor, a gear, a rack, a rotating cylinder, a connecting block, a guide rod, a splint and a spring. Fixed seats are provided on the left and right sides of the upper part of the base, a motor is provided in the front of the fixed seat, a gear is rotatably provided inside the fixed seat, and the output shaft of the motor penetrates into the fixed seat on the same side and is connected to the gear, a rack is slidably provided on the upper part of the fixed seat, the rack is meshed with the gear on the same fixed seat, a rotating cylinder is provided on the upper part of the rack, a connecting block is fixed on the rotating rod of the rotating cylinder, guide rods are slidably provided on the front and rear sides of the connecting block, a splint is fixed between the guide rods, and a spring is wound around the outside of the guide rods, the two ends of the spring are respectively connected to the connecting block and the splint, and the components on the two fixed seats are symmetrically arranged.

[0010] As a preferred technical solution of the present invention, the top of the pad is set as a flat table with consistent height.

[0011] Compared with the existing technology, the utility model has the following advantages: the utility model provides a negative pressure mechanism, and when the circuit board is placed on the fixture, the circuit board is quickly fixed by the negative pressure mechanism. Compared with conventional mechanical clamping fixtures, when the circuit board is tightened, the friction and loss of the circuit board and the fixture are relatively small, and it can maintain stable performance during long-term use, and the durability and stability are relatively high. At the same time, when taking and placing the circuit board, the operation is simple and convenient, which can effectively improve production efficiency.

[0012] The utility model provides a plurality of flexible protrusions higher than the pad on which the circuit board is placed. When the circuit board is taken or placed, the flexible protrusions can provide flexible support for the circuit board, thereby preventing the pad from being hit when the circuit board is placed, thereby preventing damage to the circuit board. When the circuit board is taken away, the flexible protrusions support the circuit board and separate from the pad, thereby effectively reducing friction between the circuit board and the pad, and providing certain protection for the circuit board.

[0013] The utility model arranges a positioning frame on the pad, so that when placing the circuit board, the workpiece can be positioned and placed quickly and accurately, thus saving adjustment time and improving processing efficiency.

[0014] The utility model is provided with a flipping mechanism, which can quickly flip the circuit board over when inspecting certain circuit boards that require double-sided inspection. There is no need to manually flip the circuit board on the fixture, which reduces the time waste caused by manually loosening or tightening the fixture and ensures that the processing is carried out in an orderly manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0016] Figure 2 It is a three-dimensional structural diagram of the components such as the pad, flexible protrusion and positioning frame of the utility model.

[0017] Figure 3 It is a cross-sectional view of the present utility model.

[0018] Figure 4 It is a three-dimensional structural diagram of the electric cylinder of the utility model in working state.

[0019] Figure 5 It is a three-dimensional structural diagram of the flip mechanism of the utility model.

[0020] Among them: 1_pad, 2_mounting seat, 21_reserved notch, 3_negative pressure joint, 31_negative pressure interface, 4_flexible bump, 5_positioning frame, 6_base, 61_electric cylinder, 8_fixed seat, 81_motor, 82_gear, 83_rack, 84_rotating cylinder, 85_connecting block, 86_guide rod, 87_splint, 88_spring. DETAILED DESCRIPTION

[0021] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which presently preferred embodiments of the present invention are shown. However, the present invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and will fully convey the scope of the invention to those skilled in the art.

[0022] Example 1: An auxiliary fixture for circuit board testing, such as Figure 1-4 As shown, it includes a pad 1, a mounting seat 2, a reserved notch 21, a negative pressure connector 3 and a negative pressure interface 31. The size and shape of the pad 1 are customized according to the model of the circuit board. The pad 1 is made of a metal material with good conductivity as a whole. The mounting seats 2 are symmetrically provided on the left and right sides of the lower part of the pad 1. The pad 1 is installed as a whole on the detection station or the transmission component through the mounting seat 2. The circuit board is placed on the pad 1, and the circuit board is subjected to corresponding performance testing at the detection station. A number of reserved notches 21 are evenly spaced on the front and back sides of the pad 1. The function of the reserved notch 21 is to be used for certain functional tests, and it is necessary to connect the detection connectors on the upper and lower sides of the circuit board surface at the same time, and the detection connector entrances reserved are used. The four corners and the middle of the pad 1 are provided with negative pressure interfaces 31 that can generate suction on the upper side of the pad 1. The lower ends of the negative pressure interfaces 31 are connected to negative pressure connectors 3 connected to external negative pressure devices. The negative pressure connector 3 and the negative pressure interface 31 are the main components required to fix the circuit board.

[0023] Among them, when it is necessary to fix the circuit board with a clamp, first install the pad 1 in the detection station through the mounting seat 2, and connect the external negative pressure equipment through a pipe at the lower end of the negative pressure joint 3. When the negative pressure equipment is working, the opening on the upper side of the negative pressure interface 31 will generate a large suction force, and the circuit board to be tested will be placed flat and parallel to the pad 1. Then, the circuit board is placed in the center position of the pad 1. After adjusting the appropriate position of the circuit board on the pad 2, the negative pressure interface 31 on the pad 2 will be covered by the lower side of the circuit board. At this time, start the negative pressure equipment, and the circuit board will be firmly adsorbed on the pad 1 through the suction force at the negative pressure joint 3. When performing certain functional tests on the circuit board, the detection device arranged under the pad 1 can contact the circuit board through the reserved notch 21. After the test is completed, the negative pressure equipment stops running, the suction in the area of the negative pressure interface is eliminated, the circuit board is released from the fixed state, and the circuit board is taken away for use. The circuit board is quickly fixed by the negative pressure mechanism. Compared with conventional mechanical clamping fixtures, when tightening the circuit board, the friction and loss of the circuit board and the fixture are relatively small, and it can maintain stable performance during long-term use, and the durability and stability are relatively high. At the same time, when taking and placing the circuit board, the operation is simple and convenient, which can effectively improve production efficiency.

[0024] Example 2 is based on Example 1, as shown in Figure 1-4 As shown, it also includes flexible protrusions 4. A plurality of strip-shaped grooves are opened on the upper part of the pad 1. A plurality of flexible protrusions 4 that can be squeezed and deformed are arranged at intervals in these grooves. The flexible protrusions 4 are evenly distributed around the pad 1. The flexible protrusions 4 are hemispherical in shape, and their tops are slightly higher than the top height of the pad 1. The function of the flexible protrusions 4 is to provide flexible support for the circuit board.

[0025] Among them, when the circuit board is placed on the pad 1, since the top height of the flexible protrusion 4 on the pad will be higher than the top height of the pad, the placed circuit board will be lifted by the flexible protrusion 4, and when lifted, a non-contact gap will be generated between the lower surface of the circuit board and the top of the pad. When the negative pressure equipment connected to the negative pressure joint 3 is working, since the distance between the lower surface of the circuit board and the negative pressure interface 31 is relatively close, the suction force generated by the negative pressure interface 31 will be greater than the deformation stress of the flexible protrusion 4. The larger suction force will cause the circuit board to be squeezed downward and contact the upper surface of the pad 1. After the inspection is completed, the suction force is eliminated, and the flexible protrusion 4 lifts the circuit board. When taking and placing the circuit board, the flexible protrusion 4 can play a flexible supporting role for the circuit board, avoiding collision with the pad 1 when placing the circuit board, causing damage to the circuit board. When taking away the circuit board, the flexible protrusion 4 supports the circuit board and separates it from the pad 1, which can effectively reduce the friction between the circuit board and the pad 1 and provide certain protection for the circuit board.

[0026] In a specific embodiment: Figure 1-2 As shown, a positioning frame 5 is also included. A positioning frame 5 is slidingly provided at the front of the pad 1. The positioning frame 5 consists of two parts. One part is two rods that penetrate into the pad 1 and can adjust the front and rear distances. The friction between the penetrated rods and the pad 1 is large and not easy to slide easily. The other part is an L-shaped plate, which consists of a plate surface that is consistent with the top height of the pad 1 and a strip-shaped protrusion on the front side. The purpose of setting the positioning frame 5 is: when it is necessary to place the circuit board on the pad 1, after placing the circuit board flatly to be parallel to the pad 1, the front side of the circuit board is pressed against the protrusion on the front of the positioning frame 5. The positioning tooling set by the positioning frame 5 can quickly and accurately position the circuit board on the pad 1, avoid the board from being skewed, save adjustment time, and improve processing efficiency.

[0027] In a specific embodiment: Figure 1 and Figure 3 As shown, it also includes a base 6 and an electric cylinder 61. Electric cylinders 61 for providing lifting power are provided on the left and right sides of the base 6. The pad 1 is installed between the two electric cylinders 61 through the mounting base 2. The mounting base 2 is screwed to the screw rod of the electric cylinder 61, and the electric cylinder 61 is used to drive the pad 1 to move back and forth. During inspection, the pad 1 is installed on the electric cylinder 61 through the mounting base, and the pad 1 is installed in the inspection station through the base 6. The height position of the circuit board on the pad is adjusted by the electric cylinder 61, and an adjustable clamp is set. When inspecting circuit boards of different models, the position of the circuit board can be adjusted quickly and flexibly to ensure the accuracy and efficiency of the inspection. There is no need to manually adjust the position of the pad 1. At the same time, when the clamp is used in some manual inspection stations, different operators can adjust the height of the pad 1 to ensure that they maintain the correct posture during the inspection process, reduce fatigue and discomfort caused by long-term work, and thus improve work safety and comfort.

[0028] In a specific embodiment: Figure 1 、 Figure 3 and Figure 5 As shown, it also includes a fixed seat 8, a motor 81, a gear 82, a rack 83, a rotating cylinder 84, a connecting block 85, a guide rod 86, a splint 87 and a spring 88. Fixed seats 8 are provided on both sides of the upper left and right sides of the base 6. Motors 81 are provided on the front of the fixed seat 8. Gears 82 are rotatably provided inside the fixed seat 8, and the output shaft of the motor 81 penetrates into the fixed seat 8 on the same side and is connected to the gear 82. Racks 83 are slidably provided on the upper part of the fixed seat 8, and the racks 83 are engaged with the gears 82 on the same fixed seat 8. When the motor 81 is working, the gear 82 rotates with the motor 81, thereby driving the rack 83 to move left or right in the fixed seat 8. One end of the bar 83 is provided with a connecting portion that bends upward, and the upper end of the connecting portion of the rack 83 is provided with a rotating cylinder 84. The rotating rods of the two rotating cylinders 81 are both facing one side of the pad 1, and a connecting block 85 is fixed on the rotating rod. Guide rods 86 are slidably provided on the front and rear sides of the connecting block 85, and a splint 87 is fixed between the guide rods 86. When the rotating cylinder 81 is working, it will drive the connecting block 85 to rotate 180 degrees, and synchronously drive the splint 87 to rotate 180 degrees. Springs 88 are wound around the outer sides of the guide rods 86, and the two ends of the spring 88 are respectively connected to the connecting block 85 and the splint 87. The components on the two fixed seats 8 on the left and right sides of the base 6 are symmetrically arranged;

[0029] When it is necessary to perform double-sided inspection on the circuit board, the electric cylinder 61 is first used to move the pad to the upper limit position. At this time, the circuit board on the pad 1 is in the area between the two clamping plates 87. Then the motor 81 is controlled to rotate, driving the gear 82 to rotate, and the rack 83 drives the clamping plate 87 and other components to move to one side of the circuit board. The two clamping plates 87 move towards each other. During the movement of the rack 83, the circuit board will be clamped by the two clamping plates 87. If the rack 83 continues to move, the guide rod 86 on the clamping plate 87 will be pushed up and slide outward, and the spring 88 will be stretched. By setting the spring 88 and the guide rod 86, a reserve is reserved when the rack 83 moves. Excessive distance, at the same time, through the spring 88 and the sliding guide rod 86, it is ensured that the clamping plate 87 is in the best state when clamping the circuit board, avoiding too tight or too loose clamping. After the circuit board is stably clamped, the motor 81 is turned off. Then, the electric cylinder 61 is controlled to drive the pad 1 to move downward to the lower limit position, and then the two rotating cylinders 84 are used to drive the clamping plate and the clamped circuit board to flip 180 degrees. When inspecting some circuit boards that require double-sided inspection, the circuit board is quickly flipped over by the flipping mechanism, and there is no need to manually flip the circuit board on the fixture, which reduces the time waste caused by manually loosening and tightening the fixture and ensures that the processing is carried out in an orderly manner.

[0030] In a preferred embodiment: the top of the pad 1 is set as a flat table with consistent height, the slots and openings on the pad 1 are all made below the top surface of the pad 1, and there are no abnormal protrusions on the top. When the circuit board is placed, it is in a state of being effectively supported by the pad 1, and the surface of the circuit board is not tilted.

[0031] The above embodiments are provided for persons familiar with the art to implement or use the present invention. Personnel familiar with the art may make various modifications or changes to the above embodiments without departing from the utility model concept of the present invention. Therefore, the scope of protection of the present invention is not limited to the above embodiments, but should be the maximum scope of the innovative features mentioned in the claims.

Claims

1. An auxiliary fixture for circuit board testing, comprising a backing plate (1); Its characteristics are: The utility model also comprises a mounting seat (2), a reserved notch (21), a negative pressure joint (3) and a negative pressure interface (31). The mounting seats (2) are symmetrically provided on the left and right sides of the lower part of the pad (1). A plurality of reserved notches (21) are evenly spaced on the front and back sides of the pad (1). The four corners of the pad (1) and the middle of the pad (1) are provided with negative pressure interfaces (31), and the lower ends of the negative pressure interfaces (31) are connected to the negative pressure joint (3).

2. The auxiliary fixture for circuit board testing according to claim 1, characterized in that: The utility model also includes flexible protrusions (4). The upper part of the pad (1) is provided with a plurality of grooves, and a plurality of flexible protrusions (4) are provided in the grooves. The flexible protrusions (4) are evenly distributed around the pad (1), and the flexible protrusions (4) are arranged in a hemispherical shape, with the tops thereof being slightly higher than the top height of the pad (1).

3. The auxiliary fixture for circuit board testing according to claim 2, characterized in that: The utility model also comprises a positioning frame (5), the front part of the pad (1) is provided with the positioning frame (5) in a sliding manner, the rear part of the positioning frame (5) penetrates into the pad (1), and the friction force between the penetrated part and the pad (1) is relatively large, and the front part of the positioning frame (5) is provided with a strip-shaped protrusion.

4. The auxiliary fixture for circuit board testing according to claim 3, characterized in that: The utility model also comprises a base (6) and an electric cylinder (61), wherein the electric cylinders (61) are provided on both the left and right sides of the base (6), and the backing plate (1) is installed between the two electric cylinders (61) through the mounting seat (2). The mounting seat (2) is screwed to the screw rod of the electric cylinder (61), and the backing plate (1) is driven to move up and down through the transmission of the electric cylinder (61).

5. The auxiliary fixture for circuit board testing according to claim 4, characterized in that: The invention also includes a fixed seat (8), a motor (81), a gear (82), a rack (83), a rotary cylinder (84), a connecting block (85), a guide rod (86), a clamping plate (87) and a spring (88). The fixed seat (8) is provided on both sides of the upper part of the base (6). The front part of the fixed seat (8) is provided with a motor (81). The fixed seat (8) is provided with a gear (82) in a rotating manner inside the fixed seat (8). The output shaft of the motor (81) penetrates into the fixed seat (8) on the same side and is connected to the gear (82). The upper part of the fixed seat (8) is provided with a rack (83) in a sliding manner. The racks (83) are all meshed with the gears (82) on the same fixed seat (8), the upper part of the racks (83) is provided with a rotating cylinder (84), the rotating rod of the rotating cylinder (84) is fixed with a connecting block (85), the front and rear sides of the connecting block (85) are slidably provided with guide rods (86), a clamping plate (87) is fixed between the guide rods (86), and a spring (88) is wound around the outside of the guide rods (86), the two ends of the spring (88) are respectively connected to the connecting block (85) and the clamping plate (87), and the components on the two fixed seats (8) are symmetrically arranged.

6. The auxiliary fixture for circuit board testing according to claim 1, characterized in that: The top of the pad (1) is set as a flat table with consistent height.

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