A PCB flatness detection device

Abstract

The present invention relates to the technical field of PCB board detection, specifically to a PCB board flatness detection device, comprising a base, a row of pressing wheels that are sequentially close to and form a pressing wheel group are arranged above the base, the wheel axles of the pressing wheels are distributed in the front-to-back direction, and the pressing wheels are slidably arranged in the vertical direction, a stroke amplification mechanism is connected above the pressing wheels, a follow-up positioning part is arranged at the output end of the stroke amplification mechanism, a detection hole is penetrated and opened on the positioning part, the detection holes are distributed in the front-to-back direction, and each detection hole is connected in sequence, a laser transmitter is arranged outside the first detection hole, and a laser receiver is arranged outside the last detection hole. The present invention is provided with a pressing wheel, a stroke amplification mechanism, and a positioning part with a detection hole, the pressing wheel is rolled on the PCB board surface, lifted by an uneven place, and the displacement of the positioning part is amplified by the stroke amplification mechanism, the displacement of each positioning part is different, the laser is blocked, and line detection can be directly realized, and the detection efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of PCB board detection, and in particular to a PCB board flatness detection device. Background Art

[0002] Since PCB boards are thin and easy to deform, if devices are welded directly on a deformed PCB board, the PCB board will be separated from the welding pin plane, causing problems such as empty solder joints and cold solder joints of the chip. Therefore, it is necessary to detect the flatness of the PCB board before welding. Most of the detection devices currently used use laser detection or 3D machine vision for surface detection. Laser detection uses a beam of laser to vertically irradiate the PCB board surface to detect the distance of the irradiation point to determine whether the point is flat. This detection method is point detection, which achieves line detection by moving the PCB board, but cannot achieve surface detection. The detection efficiency is low, and the cost of 3D machine vision detection is high. In view of this, the present application proposes a low-cost and high-efficiency PCB board flatness detection device. Summary of the invention

[0003] The purpose of the present invention is to provide a PCB flatness detection device to solve the problems raised in the above background technology.

[0004] The above-mentioned object of the present invention is achieved through the following technical solutions:

[0005] A PCB flatness detection device comprises a base, a row of pressing wheels which are sequentially close to form a pressing wheel group are arranged above the base, the bottom ends of the pressing wheels are located in the same plane, the wheel axles of the pressing wheels are distributed along the front-back direction, and the pressing wheels are slidably arranged along the vertical direction, a stroke amplification mechanism is connected above the pressing wheels, a follow-up positioning part is arranged at the output end of the stroke amplification mechanism, a detection hole is penetrated and opened on the positioning part, the detection holes are distributed along the front-back direction, and the detection holes are sequentially connected, a laser transmitter is arranged outside the first detection hole, and a laser receiver is arranged outside the last detection hole;

[0006] The stroke amplification mechanism includes a reducer pipe section with a small diameter in the upper section and a large diameter in the lower section, a small piston and a large piston slidably arranged in the upper and lower sections of the reducer pipe section respectively, and hydraulic oil is filled in the reducer pipe section and between the small piston and the large piston, the top surface of the small piston is connected to the positioning part, and the bottom surface of the large piston is connected to the pressure wheel.

[0007] Optionally, the pressure wheel is provided with a circle of annular grooves, a wheel hoop is provided in the annular groove, the pressure wheel is rotatably connected to the wheel hoop, a bracket is connected to the outer peripheral surface of the wheel hoop, a support plate is connected to the bracket, and the upper end of the support plate is connected to the bottom surface of the large piston.

[0008] Optionally, it also includes a horizontal frame spanning across the base, a lifting plate is provided on the horizontal frame for sliding in the vertical direction, each of the reducing pipe sections is fixedly arranged on the lifting plate, a cylinder is installed on the top of the horizontal frame, and the output end of the cylinder passes through the horizontal frame and is connected to the lifting plate.

[0009] Optionally, an upper cover and a lower cover are respectively provided at the upper and lower ends of the reducer section; the top surface of the small piston is connected to a small piston rod, the small piston rod passes through the upper cover, and the upper end of the small piston rod is connected to the positioning portion; the bottom surface of the large piston is connected to a large piston rod, the large piston rod passes through the lower cover, a convex ring is fixed on the large piston rod, a return spring is provided between the convex ring and the lower cover and on the outer sleeve of the large piston rod; the upper end of the support plate is connected to the lower end of the large piston rod.

[0010] Optionally, the detection hole is arranged as a vertical long hole.

[0011] Optionally, a detection platform for fixing a PCB board is slidably provided on the base in left-right directions, and a linear module for driving the detection platform to slide linearly is also provided on the base.

[0012] Optionally, the lower end of the large piston rod is connected to a horizontal plate, the left end of the bottom surface of the horizontal plate is connected to a vertical plate, the upper end of the support plate is hinged to the horizontal plate and the left side of the support plate is arranged in contact with the vertical plate, and a return spring is squeezed between the right side of the support plate and the horizontal plate.

[0013] Optionally, a magnetic block is embedded in the right side surface of the vertical plate, and the support plate is magnetically attracted to the magnetic block.

[0014] Compared with the prior art, the present invention provides a PCB flatness detection device, which has the following beneficial effects:

[0015] The present invention provides a pressure wheel, a stroke amplification mechanism, and a positioning part with a detection hole. The pressure wheel is rolled on the PCB board surface, lifted by the unevenness, and the displacement of the positioning part is amplified by the stroke amplification mechanism. The displacement of each positioning part is different, the laser is blocked, and line detection can be directly realized, with high detection efficiency.

[0016] In the present invention, the pressure wheel is hingedly arranged on the horizontal plate at the lower end of the large piston rod through a support plate, and is kept in a vertical arrangement by a magnetic block and a return spring on the vertical plate. When encountering a PCB board with high unevenness, due to the limited displacement of the stroke amplification mechanism, the pressure wheel can be triggered a second time to deflect to the side of the return spring to increase the distance between the pressure wheel and the PCB board surface, thereby avoiding hard squeezing of the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a front view of the stroke amplification mechanism in the present invention;

[0019] Figure 3 For the present invention Figure 2 A cross-sectional view along section BB;

[0020] Figure 4 For the present invention Figure 1 A magnified view of part A;

[0021] Figure 5 It is a schematic structural diagram of the pressure wheel in the present invention.

[0022] In the figure: 1. base; 2. cross frame; 3. cylinder; 4. lifting plate; 5. detection table; 6. linear module; 7. pressure wheel; 701. annular groove; 702. wheel hoop; 703. bracket; 704. support plate; 705. cross plate; 706. vertical plate; 707. magnetic block; 708. reset spring; 8. stroke amplification mechanism; 801. reducer; 802. large piston; 803. small piston; 804. large piston rod; 805. small piston rod; 806. convex ring; 807. return spring; 9. positioning part; 901. detection hole; 10. laser transmitter; 11. laser receiver. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example: See Figure 1-5As shown, a PCB flatness detection device comprises a base 1, on which a detection platform 5 for fixing the PCB board is slidably provided in the left-right direction, and a linear module 6 for driving the detection platform 5 to slide linearly is also provided on the base 1. A row of pressing wheels 7 which are sequentially close to and form a pressing wheel group are provided above the detection platform 5 located on the base 1, and the bottom ends of the pressing wheels 7 are located in the same plane, and the pressing surfaces of the pressing wheel group form a line detection for the flatness detection of the PCB board. The axles of the pressing wheels 7 are distributed in the front-to-back direction, and the pressing wheels 7 are slidably provided in the vertical direction. A stroke amplification mechanism 8 is connected above the pressing wheel 7, and a follow-up positioning part 9 is provided at the output end of the stroke amplification mechanism 8. A detection hole 901 is opened through the positioning part 9, and the detection holes 901 are distributed in the front-to-back direction, and each detection hole 901 is provided in the front-to-back direction. 01 are connected in sequence, and the connectivity of the detection holes 901 is associated with the height position of each pressure wheel 7. When a certain pressure wheel 7 or part of the pressure wheels 7 is lifted, the detection holes 901 on the corresponding positioning part 9 will be staggered with other detection holes 901. A laser transmitter 10 is set outside the first detection hole 901, and a laser receiver 11 is set outside the last detection hole 901. When the detection holes 901 are staggered, the laser emitted by the laser transmitter 10 is blocked, and the laser receiver 11 cannot receive the signal, indicating that the flatness of the PCB board surface does not meet the standard. This process can directly realize line detection with high detection efficiency. Combined with the linear sliding of the detection table 5, the surface detection of the PCB board can be further realized.

[0025] On the basis of the above embodiment, the stroke amplification mechanism 8 includes a reducer pipe section 801 with a small diameter on the upper section and a large diameter on the lower section, a small piston 803 and a large piston 802 slidably arranged in the upper and lower sections of the reducer pipe section 801, respectively, and hydraulic oil is filled in the reducer pipe section 801 and between the small piston 803 and the large piston 802. Among them, the ratio of the inner diameters of the upper and lower sections of the reducer pipe section 801 can be set at 1:2-1:3, and the corresponding travel ratio of the small piston 803 and the large piston 802 is 4:1-9:1, so the slight movement of the large piston 802 can drive the significant movement of the small piston 803, thereby achieving the effect of amplifying the displacement of the large piston 802.

[0026] On the basis of the above-mentioned embodiment, the PCB flatness detection device further comprises a horizontal frame 2 spanning the base 1, a lifting plate 4 is slidably provided on the horizontal frame 2 in the vertical direction, each reducing pipe section 801 is fixedly connected to the lifting plate 4, a cylinder 3 is installed on the top of the horizontal frame 2, and the output end of the cylinder 3 passes through the horizontal frame 2 and is connected to the lifting plate 4. After the PCB board is fixed on the detection table 5, the cylinder 3 can be controlled to push the lifting plate 4 downward until the pressure wheel 7 located below rolls slightly on the surface of the PCB board. By adjusting the cylinder 3, the device can be adapted to PCB boards of different thicknesses.

[0027] On the basis of the above embodiment, the upper and lower ends of the reducer section 801 are respectively provided with an upper cover and a lower cover, the top surface of the small piston 803 is connected with a small piston rod 805, the small piston rod 805 penetrates the upper cover, the upper end of the small piston rod 805 is connected with a positioning part 9, and the detection hole 901 provided on the positioning part 9 is provided in a vertical long hole. The bottom surface of the large piston 802 is connected with a large piston rod 804, the large piston rod 804 penetrates the lower cover, a convex ring 806 is fixed on the large piston rod 804, and a return spring 807 is provided between the convex ring 806 and the lower cover and on the outer sleeve of the large piston rod 804. The lower end of the large piston rod 804 is connected with a horizontal plate 705, and the left end of the bottom surface of the horizontal plate 705 is connected with a vertical plate 706. The pressure wheel 7 is provided with a circle of annular groove 701, and a wheel hoop 702 is arranged in the annular groove 701. The pressure wheel 7 is rotatably connected to the wheel hoop 702. A bracket 703 is connected to the outer peripheral surface of the wheel hoop 702, and a support plate 704 is connected to the bracket 703. The upper end of the support plate 704 is hinged to the horizontal plate 705 and the left side of the support plate 704 is arranged in contact with the vertical plate 706. A magnetic block 707 is embedded on the right side of the vertical plate 706. The support plate 704 and the magnetic block 707 are magnetically attracted to each other, and a return spring 708 is squeezed between the right side of the support plate 704 and the horizontal plate 705. When the pressure wheel 7 rolls on the PCB board and is lifted by the uneven part, it will be transmitted to the large piston 802 through the bracket 703, the support plate 704, the cross plate 705, the large piston rod 804 in turn, so that the large piston 802 moves up and drives the positioning part 9 at the upper end of the small piston rod 805 to move up. When the pressure wheel 7 falls back to the flat place, the return spring 807 exerts a pressure force on the convex ring 806, so that the large piston rod 804 and the large piston 802 return quickly to facilitate subsequent re-testing. When the flatness is within a certain range and meets the standard, the displacement of the positioning part 9 caused can be converted into the allowed displacement of the positioning part 9 and designed to the length of the detection hole 901. When encountering a PCB board with a high degree of unevenness, such as when the PCB board has a relatively warped edge, the displacement stroke of the small piston 803 in the reducer section 801 may be insufficient. Since the pressure wheel 7 is hingedly set on the horizontal plate 705 at the lower end of the large piston rod 804 through the support plate 704, and is kept in a vertical setting by the magnetic block 707 and the reset spring 708 on the vertical plate 706, the pressure wheel 7 can be triggered a second time to deflect toward the side of the reset spring 708 to increase the distance between the pressure wheel 7 and the PCB board surface, thereby facilitating the pressure wheel 7 to pass through the warped edge smoothly. After passing through, under the squeezing of the reset spring 708 and the magnetic attraction of the magnetic block 707, the support plate 704 is re-attached to the vertical plate 706 to allow the pressure wheel 7 to maintain a vertical setting again.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PCB flatness detection device, comprising a base (1), characterized in that: A row of pressing wheels (7) are arranged above the base (1) and are adjacent to each other in sequence to form a pressing wheel group. The bottom ends of the pressing wheels (7) are located in the same plane. The axles of the pressing wheels (7) are arranged along the front-to-back direction, and the pressing wheels (7) are slidably arranged along the vertical direction. A stroke amplification mechanism (8) is connected above the pressing wheel (7). A follow-up positioning part (9) is arranged at the output end of the stroke amplification mechanism (8). A detection hole (901) is formed through the positioning part (9). The detection holes (901) are arranged along the front-to-back direction, and the detection holes (901) are connected in sequence. A laser transmitter (10) is arranged outside the first detection hole (901), and a laser receiver (11) is arranged outside the last detection hole (901). The stroke amplification mechanism (8) comprises a reducer pipe section (801) with a small diameter at the upper section and a large diameter at the lower section, a small piston (803) and a large piston (802) respectively slidably arranged in the upper and lower sections of the reducer pipe section (801), the reducer pipe section (801) and the space between the small piston (803) and the large piston (802) are filled with hydraulic oil, the top surface of the small piston (803) is connected to the positioning portion (9), and the bottom surface of the large piston (802) is connected to the pressure wheel (7); The pressure wheel (7) is provided with a circle of annular grooves (701), a wheel hoop (702) is provided in the annular groove (701), the pressure wheel (7) is rotatably connected to the wheel hoop (702), a bracket (703) is connected to the outer peripheral surface of the wheel hoop (702), a support plate (704) is connected to the bracket (703), and the upper end of the support plate (704) is connected to the bottom surface of the large piston (802); The upper and lower ends of the reducer pipe section (801) are respectively provided with an upper cover and a lower cover; the top surface of the small piston (803) is connected to a small piston rod (805), the small piston rod (805) passes through the upper cover, and the upper end of the small piston rod (805) is connected to the positioning portion (9); the bottom surface of the large piston (802) is connected to a large piston rod (804), the large piston rod (804) passes through the lower cover, a convex ring (806) is fixedly provided on the large piston rod (804), and a return spring (807) is provided between the convex ring (806) and the lower cover and on the outer sleeve of the large piston rod (804); the upper end of the support plate (704) is connected to the lower end of the large piston rod (804); The detection hole (901) is arranged as a vertical long hole.

2. A PCB flatness detection device according to claim 1, characterized in that: It also comprises a horizontal frame (2) spanning the base (1), a lifting plate (4) being slidably arranged on the horizontal frame (2) in the vertical direction, each of the reducing pipe sections (801) being fixedly arranged on the lifting plate (4), a cylinder (3) being installed on the top of the horizontal frame (2), and an output end of the cylinder (3) passing through the horizontal frame (2) and then connected to the lifting plate (4).

3. A PCB flatness detection device according to claim 1, characterized in that: A detection platform (5) for fixing a PCB board is provided on the base (1) in a sliding manner in the left-right direction, and a linear module (6) for driving the detection platform (5) to slide linearly is also provided on the base (1).

4. A PCB flatness detection device according to claim 1, characterized in that: The lower end of the large piston rod (804) is connected to a transverse plate (705), the left end of the bottom surface of the transverse plate (705) is connected to a vertical plate (706), the upper end of the support plate (704) is hinged to the transverse plate (705) and the left side of the support plate (704) is arranged in contact with the vertical plate (706), and a return spring (708) is squeezed between the right side of the support plate (704) and the transverse plate (705).

5. A PCB flatness detection device according to claim 4, characterized in that: A magnetic block (707) is embedded on the right side of the vertical plate (706), and the support plate (704) and the magnetic block (707) are arranged to be magnetically attracted.

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