PCB pneumatic test frame

Abstract

The invention discloses a PCB pneumatic test frame, and relates to the technical field of pneumatic test frames, and the PCB pneumatic test frame comprises a base, the upper surface of the base is provided with a plurality of supporting rods, one end, away from the base, of each supporting rod is provided with a supporting plate, the lower surface of each supporting plate is provided with an extrusion part, the upper surface of each supporting plate is provided with a movable hole, and a movable part is inserted in each movable hole and is slidably connected in each extrusion part. A lower pressing plate is installed at the end, away from the supporting plate, of the movable part, and multiple probes are installed on the side, away from the extrusion part, of the lower pressing plate. The movable structure composed of the movable ring and the connecting rod is slidably connected in the sealing cylinder, the movable structure drives the lower pressing plate to move downwards so that the probe can make contact with the PCB, the buffer structure composed of the movable cylinder and the partition plate is connected with the movable structure, and the buffer structure occupies the space in the sealing cylinder so that the probe can be conveniently and rapidly detected. Therefore, the movement of the movable structure in the sealing cylinder is accelerated, and the time required for the movable structure to drive the lower pressing plate and the probe to contact with the PCB is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic test stands, in particular to a PCB pneumatic test stand. Background Art

[0002] After the PCB board is manufactured, in order to ensure the qualified rate of the finished product, its various interfaces need to be tested to ensure the smooth flow of the circuit. In the existing technology, the common testing method is to place the PCB board on a test bench, and then use a cylinder to drive the probe to contact the PCB board to test each circuit on the PCB board.

[0003] Since the cylinder uses gas to drive the piston rod to move evenly, the probe needle needs to move a certain distance before contacting the PCB board, which takes a lot of time. In addition, when the probe needle contacts the PCB board, it is easy for the PCB board to be tilted or the PCB board to protrude from one end of the probe needle, causing the probe needle and the PCB board to collide when contacting, causing damage to the probe needle or the PCB board. Summary of the Invention

[0004] The object of the present invention is to provide a PCB pneumatic test stand to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a PCB pneumatic test frame, comprising a base, a plurality of support rods installed on the upper surface of the base, a support plate installed on the end of the support rod away from the base, an extrusion piece installed on the lower surface of the support plate, a movable hole provided on the upper surface of the support plate, a movable piece inserted in the movable hole, and the movable piece is slidably connected in the extrusion piece, a lower pressure plate is installed on the end of the movable piece away from the support plate, a plurality of detection pins are installed on the side of the lower pressure plate away from the extrusion piece, a first circular hole is provided on the upper surface of the lower pressure plate, a contact piece is installed in the first circular hole, and the end of the contact piece away from the first circular hole is inserted in the movable piece.

[0006] Furthermore, the extrusion part includes a sealing cylinder, which is installed on the lower surface of the support plate. A connecting pipe is installed on the annular surface of the sealing cylinder. An air pump is installed at one end of the connecting pipe away from the sealing cylinder. The movable part is slidably connected in the sealing cylinder.

[0007] Furthermore, the movable part includes a movable ring, which is slidably connected in the sealing cylinder. A plurality of connecting rods are installed at the end of the movable ring facing the outside of the sealing cylinder. The end of the connecting rod away from the movable ring is connected to the lower pressure plate. A buffer part is installed in the movable ring, the buffer part is inserted in the movable hole, and the contact part is inserted in the buffer part.

[0008] Furthermore, the buffer member includes a movable cylinder, which is inserted into the movable hole and installed on the annular inner surface of the movable ring. Two partition plates are installed in the movable cylinder, and a second circular hole is provided on the upper surface of the partition plate. The end of the contact member away from the first circular hole passes through the movable cylinder and is inserted into the second circular hole. A connecting hole communicating with the space inside the sealing cylinder is provided on the annular surface of the movable cylinder. The connecting hole is arranged between the two partition plates, and the connecting hole is arranged on the side of the movable ring away from the connecting rod. The contact member is in sliding contact with the connecting hole.

[0009] Furthermore, the contact piece includes a contact rod, which is vertically inserted in the first circular hole, and the end of the contact rod away from the first circular hole passes through the second circular hole on the lower partition plate and extends into the movable cylinder. The contact rod is provided with a sealing plate installed on the annular surface between the two partition plates, and the sealing plate is in sliding contact with the connecting hole. The contact rod is provided with a sealing member at the end away from the first circular hole, and the sealing member passes through the second circular hole and is slidably connected in the movable cylinder.

[0010] Furthermore, the sealing member includes a round rod, which is installed at the end of the contact rod away from the first round hole. The end of the round rod away from the contact rod passes through the second round hole and is installed with a piston. The piston is slidably connected in the movable cylinder. A plurality of first elastic members are installed on the side of the piston facing the partition plate. The end of the first elastic member away from the piston is connected to the partition plate.

[0011] Furthermore, a sealing ring is installed in the movable hole, and the movable cylinder is slidably connected to the annular surface of the sealing ring.

[0012] Furthermore, a plurality of second elastic members are installed on the upper surface of the blocking plate, and one end of the second elastic member away from the blocking plate is connected to the partition plate.

[0013] Furthermore, a protective sleeve is installed at one end of the contact rod away from the movable cylinder.

[0014] Furthermore, a limiting frame is installed on the upper surface of the base, and the limiting frame is arranged directly below the lower pressing plate.

[0015] The present invention provides a PCB pneumatic test stand, which has the following beneficial effects:

[0016] 1. The present invention slides a movable structure consisting of a movable ring and a connecting rod in a sealing cylinder, uses the movable structure to drive the lower pressure plate to move downward, so that the detection needle contacts the PCB board, and then connects a buffer structure consisting of a movable cylinder and a partition plate to the movable structure. The buffer structure occupies the space in the sealing cylinder, thereby accelerating the movement of the movable structure in the sealing cylinder and reducing the time required for the movable structure to drive the lower pressure plate and the detection needle to contact the PCB board.

[0017] 2. The present invention installs a contact structure consisting of a contact rod, a sealing plate, a round rod and a piston in a buffer structure, and uses the contact structure to first contact the PCB board. However, after the contact structure contacts the PCB board, the sealing plate is separated from the connecting hole. At this time, the air entering the sealing cylinder enters the buffer structure through the connecting hole, thereby reducing the speed at which the movable structure drives the lower pressure plate and the detection needle to contact the PCB board, thereby reducing the damage to the PCB board caused by the detection needle after contact with the PCB board. After the test is completed, the air pump extracts the air in the sealing cylinder, and the first elastic member drives the piston to move toward the partition plate, thereby extending the contact time between the contact rod and the PCB board, making it easier for the detection needle to separate from the PCB board. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a PCB pneumatic test stand of the present invention;

[0019] Figure 2 This is a schematic diagram of the assembly of a movable cylinder and a movable ring of a PCB pneumatic test stand in a sealing cylinder according to the present invention;

[0020] Figure 3 This is a schematic diagram of the assembly of a contact rod, a piston and a round rod in a movable cylinder of a PCB pneumatic test stand of the present invention;

[0021] Figure 4 This is a schematic diagram of the assembly of a piston, a round rod, and a contact rod of a PCB pneumatic test stand of the present invention;

[0022] Figure 5 This is a schematic diagram of the assembly of a partition plate of a PCB pneumatic test stand in a movable cylinder according to the present invention;

[0023] Figure 6 The figure is a schematic diagram of the assembly of the support plate, sealing cylinder and base of a PCB pneumatic test stand of the present invention.

[0024] In the figure: 1. base; 2. limiting frame; 3. lower pressure plate; 4. support rod; 5. protective cover; 6. connecting pipe; 7. support plate; 8. movable cylinder; 9. sealing ring; 10. sealing cylinder; 11. connecting rod; 12. detection needle; 13. contact rod; 14. movable ring; 15. connecting hole; 16. piston; 17. first elastic member; 18. second elastic member; 19. blocking plate; 20. partition plate; 21. round rod; 22. movable hole; 23. second round hole. DETAILED DESCRIPTION

[0025] See also Figures 1 to 6The present invention provides a technical solution: a PCB pneumatic test frame, comprising a base 1, a plurality of support rods 4 are installed on the upper surface of the base 1, a support plate 7 is installed on the end of the support rod 4 away from the base 1, an extrusion part including a sealing cylinder 10 is installed on the lower surface of the support plate 7, a connecting pipe 6 is installed on the annular surface of the sealing cylinder 10, an air pump is installed on the end of the connecting pipe 6 away from the sealing cylinder 10, a movable ring 14 is slidably connected in the sealing cylinder 10, a plurality of connecting rods 11 are installed on the end of the movable ring 14 facing the outside of the sealing cylinder 10, a lower pressure plate 3 is installed on the end of the connecting rod 11 away from the movable ring 14, a plurality of detection pins 12 are installed on the side of the lower pressure plate 3 away from the extrusion part, a movable hole 22 is opened on the upper surface of the support plate 7, a movable cylinder 8 is inserted in the movable hole 22, and the movable cylinder 8 is installed on the inner surface of the annular surface of the movable ring 14.

[0026] The air pump introduces air into the sealing cylinder 10 through the connecting pipe 6, thereby increasing the air pressure in the sealing cylinder 10. At this time, the air will squeeze the movable ring 14, causing the movable ring 14 to move toward the side outside the sealing cylinder 10. When the movable ring 14 moves toward the side outside the sealing cylinder 10, the connecting rod 11 drives the lower pressure plate 3 and the detection needle 12 to move downward. At the same time, during the movement of the movable ring 14, the movable ring 14 drives the movable cylinder 8 to move together, ensuring that the space in the sealing cylinder 10 does not increase.

[0027] By slidingly connecting a movable structure composed of a movable ring 14 and a connecting rod 11 in the sealing cylinder 10, the movable structure is used to drive the lower pressure plate 3 to move downward, so that the detection needle 12 contacts the PCB board, and then the buffer structure composed of the movable cylinder 8 and the partition plate 20 is connected to the movable structure. The buffer structure occupies the space in the sealing cylinder 10, thereby accelerating the movement of the movable structure in the sealing cylinder 10 and reducing the time required for the movable structure to drive the lower pressure plate 3 and the detection needle 12 to contact the PCB board.

[0028] A first circular hole is provided on the upper surface of the lower pressure plate 3, and a contact rod 13 is inserted into the first circular hole. The horizontal height of the lower end of the contact rod 13 is lower than the horizontal height of the lower end of the detection needle 12. A connecting hole 15 communicating with the space inside the sealing cylinder 10 is provided on the annular surface of the movable cylinder 8, and the connecting hole 15 is arranged between the two partition plates 20. The end of the contact rod 13 away from the first circular hole passes through the second circular hole 23 on the lower partition plate 20 and extends into the movable cylinder 8. A sealing plate 19 is installed on the annular surface of the contact rod 13 between the two partition plates 20. The sealing plate 19 slides with the connecting hole 15. Dynamic contact, two partition plates 20 are installed in the movable cylinder 8, and a second circular hole 23 is opened on the upper surface of the partition plate 20. A round rod 21 is installed at the end of the contact rod 13 away from the first circular hole, and the end of the round rod 21 away from the contact rod 13 passes through the second circular hole 23 and is installed with a piston 16. The piston 16 is slidably connected in the movable cylinder 8, and a plurality of first elastic members 17 are installed on the side of the piston 16 facing the partition plate 20. The first elastic member 17 is a spring. The first elastic member 17 is in a normal state, and the end of the first elastic member 17 away from the piston 16 is connected to the partition plate 20.

[0029] By installing a contact structure consisting of a contact rod 13, a sealing plate 19, a round rod 21 and a piston 16 in the buffer structure, the contact structure is first used to contact the PCB board. However, after the contact structure contacts the PCB board, the sealing plate 19 is separated from the connecting hole 15. At this time, the air entering the sealing cylinder 10 enters the buffer structure through the connecting hole 15, thereby reducing the speed at which the movable structure drives the lower pressure plate 3 and the detection needle 12 to contact the PCB board, thereby reducing the damage to the PCB board caused by the detection needle 12 after contact with the PCB board.

[0030] And when the test is completed, the air pump extracts the air in the sealing tube 10, and the first elastic member 17 drives the piston 16 to move toward the partition plate 20, so that the contact rod 13 still maintains contact with the PCB board when the lower pressure plate 3 and the detection needle 12 are separated from the PCB board. By extending the contact time between the contact rod 13 and the PCB board, the detection needle 12 is facilitated to separate from the PCB board.

[0031] In order to prevent the air entering the sealing cylinder 10 from being discharged through the gap between the movable hole 22 and the movable cylinder 8, a sealing ring 9 is installed in the movable hole 22, and the movable cylinder 8 is slidably connected to the annular surface of the sealing ring 9.

[0032] In order to prevent air from entering the sealing cylinder 10 and squeezing the sealing plate 19 through the connecting hole 15, so that the air enters the movable cylinder 8 in advance, a plurality of second elastic members 18 are installed on the upper surface of the sealing plate 19. The second elastic member 18 is a spring. The second elastic member 18 is in a normal state. The end of the second elastic member 18 away from the sealing plate 19 is connected to the partition plate 20. The second elastic member 18 is used to support the sealing plate 19, thereby preventing the sealing plate 19 from being squeezed by the air in the sealing cylinder 10 and entering the movable cylinder 8 through the connecting hole 15.

[0033] In order to further reduce the damage to the PCB board caused by the contact rod 13 when it contacts the PCB board, a protective cover 5 is installed at the end of the contact rod 13 away from the movable cylinder 8. In order to facilitate limiting the position of the PCB board, a limiting frame 2 is installed on the upper surface of the base 1. The limiting frame 2 is used to limit the position of the PCB board, and the limiting frame 2 is arranged directly below the lower pressure plate 3.

[0034] In summary, when using this PCB pneumatic test stand, first place the PCB board to be tested in the limiting frame 2, then start the air pump and let air into the sealing cylinder 10 through the connecting pipe 6. After the air enters the sealing cylinder 10, it squeezes the movable ring 14, causing the movable ring 14 to move to the side away from the support plate 7. While the movable ring 14 moves to the side away from the support plate 7, it drives the lower pressure plate 3 and the detection needle 12 to approach the PCB board below through the connecting rod 11. Since the movable cylinder 8 is installed on the annular inner surface of the movable ring 14, the movable ring 14 will also drive the movable cylinder 8 to move downward while moving. Since the contact rod 13 is installed on the partition plate 20 in the movable cylinder 8, the movable cylinder 8 will also drive the contact rod 13 to move toward the PCB board when it moves downward. During the movement of the movable ring 14 inside the sealing cylinder 10, since the movable cylinder 8 occupies most of the space in the sealing cylinder 10, the movable ring 14 descends faster in the sealing cylinder 10, reducing the time required for the movable structure to drive the lower pressure plate 3 and the detection needle 12 to contact the PCB board.

[0035] As the lower pressure ring moves downward in the sealing cylinder 10, the contact rod 13 first contacts the PCB board. After the contact rod 13 contacts the PCB board, the PCB board forms a resistance against the contact rod 13, so that the relative position of the contact rod 13 in the movable cylinder 8 gradually rises. When the relative position of the contact rod 13 in the movable cylinder 8 rises, the blocking plate 19 installed on the contact rod 13 gradually separates from the connecting hole 15 opened on the annular surface of the movable cylinder 8. At the same time, the piston 16 connected to the contact rod 13 through the round rod 21 moves upward in the movable cylinder 8. At this time, part of the air entering the sealing cylinder 10 enters the movable cylinder 8, which slows down the descending height of the movable ring 14 in the sealing cylinder 10, thereby reducing the damage to the PCB board caused by the contact between the detection needle 12 and the PCB board.

[0036] When the PCB board inspection is completed and the position of the lower pressure plate 3 needs to be raised again, the air pump will again extract the air in the sealing cylinder 10 through the connecting rod 11 to reduce the air pressure in the sealing cylinder 10. At this time, the movable ring 14 moves upward in the sealing cylinder 10, and at the same time drives the lower pressure plate 3 and the detection needle 12 to rise. Since the piston 16 was previously raised in the movable cylinder 8, the first elastic member 17 is in a stretched state at this time. After the movable ring 14 drives the movable cylinder 8 to rise, the first elastic member 17 releases the rebound force, causing the piston 16 to lower its position in the movable cylinder 8. After the piston 16 is lowered, it abuts the contact rod 13 through the round rod 21, so that the contact rod 13 is abutted and cannot be separated from the PCB board, and maintains contact with the PCB board for a period of time, thereby facilitating the separation of the detection needle 12 from the PCB board.

[0037] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. A PCB pneumatic test stand, comprising a base (1), characterized in that: A plurality of support rods (4) are installed on the upper surface of the base (1), a support plate (7) is installed at one end of the support rod (4) away from the base (1), an extrusion piece is installed on the lower surface of the support plate (7), a movable hole (22) is opened on the upper surface of the support plate (7), a movable part is inserted in the movable hole (22), and the movable part is slidably connected in the extrusion piece, a lower pressing plate (3) is installed at one end of the movable part away from the support plate (7), a plurality of detection needles (12) are installed on the side of the lower pressing plate (3) away from the extrusion piece, a first circular hole is opened on the upper surface of the lower pressing plate (3), a contact piece is installed in the first circular hole, and the end of the contact piece away from the first circular hole is inserted in the movable piece.

2. A PCB pneumatic test stand according to claim 1, characterized in that: The extrusion part includes a sealing cylinder (10), which is installed on the lower surface of the support plate (7). A connecting pipe (6) is installed on the annular surface of the sealing cylinder (10), and an air pump is installed at one end of the connecting pipe (6) away from the sealing cylinder (10). The movable part is slidably connected in the sealing cylinder (10).

3. A PCB pneumatic test stand according to claim 2, characterized in that: The movable part includes a movable ring (14), which is slidably connected in the sealing cylinder (10), and a plurality of connecting rods (11) are installed at one end of the movable ring (14) facing the outside of the sealing cylinder (10), and the end of the connecting rod (11) away from the movable ring (14) is connected to the lower pressure plate (3), and a buffer is installed in the movable ring (14), and the buffer is inserted in the movable hole (22), and the contact part is inserted in the buffer.

4. A PCB pneumatic test stand according to claim 3, characterized in that: The buffer member includes a movable cylinder (8), the movable cylinder (8) is inserted into the movable hole (22), and the movable cylinder (8) is installed on the annular inner surface of the movable ring (14), two partition plates (20) are installed in the movable cylinder (8), and a second circular hole (23) is provided on the upper surface of the partition plate (20), and the end of the contact member away from the first circular hole passes through the movable cylinder (8) and is inserted into the second circular hole (23), and a connecting hole (15) is provided on the annular surface of the movable cylinder (8) and communicates with the space inside the sealing cylinder (10), and the connecting hole (15) is arranged between the two partition plates (20), and the connecting hole (15) is arranged on the side of the movable ring (14) away from the connecting rod (11), and the contact member is in sliding contact with the connecting hole (15).

5. A PCB pneumatic test stand according to claim 4, characterized in that: The contact member comprises a contact rod (13), the contact rod (13) being vertically inserted into the first circular hole, the end of the contact rod (13) away from the first circular hole passing through the second circular hole (23) on the lower partition plate (20) and extending into the movable cylinder (8), the contact rod (13) being provided with a blocking plate (19) on the annular surface between the two partition plates (20), the blocking plate (19) being in sliding contact with the connecting hole (15), the end of the contact rod (13) away from the first circular hole being provided with a sealing member, the sealing member passing through the second circular hole (23) and being slidably connected to the movable cylinder (8).

6. A PCB pneumatic test stand according to claim 5, characterized in that: The sealing member comprises a round rod (21), wherein the round rod (21) is mounted on an end of the contact rod (13) away from the first round hole, and the end of the round rod (21) away from the contact rod (13) passes through the second round hole (23) and is mounted with a piston (16), wherein the piston (16) is slidably connected in the movable cylinder (8), and a plurality of first elastic members (17) are mounted on a side of the piston (16) facing the partition plate (20), and the end of the first elastic member (17) away from the piston (16) is connected to the partition plate (20).

7. A PCB pneumatic test stand according to claim 4, characterized in that: A sealing ring (9) is installed in the movable hole (22), and the movable cylinder (8) is slidably connected to the annular surface of the sealing ring (9).

8. The PCB pneumatic test stand according to claim 5, characterized in that: A plurality of second elastic members (18) are installed on the upper surface of the blocking plate (19), and one end of the second elastic member (18) away from the blocking plate (19) is connected to the partition plate (20).

9. The PCB pneumatic test stand according to claim 5, characterized in that: A protective sleeve (5) is installed at one end of the contact rod (13) away from the movable cylinder (8).

10. The PCB pneumatic test stand according to claim 1, characterized in that: A limiting frame (2) is installed on the upper surface of the base (1), and the limiting frame (2) is arranged directly below the lower pressing plate (3).

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