SMT surface mounting intelligent reinspection machine

Abstract

The invention relates to the technical field of SMT surface mounting detection, in particular to an SMT surface mounting intelligent reinspection machine which comprises a bottom plate and a PCB used for detection, a detection mechanism is arranged on the bottom plate and comprises two first electric telescopic rods fixedly installed on the bottom plate, the output ends of the first electric telescopic rods are fixedly connected with connecting blocks, and the connecting blocks are fixedly connected with the PCB. L-shaped plates are fixedly connected to the outer sides of the connecting blocks, a cross beam is fixedly connected between the two L-shaped plates, a plurality of detection units are fixedly connected to the front side of the cross beam, each detection unit comprises two L-shaped blocks, rotating rods are rotationally connected to the inner walls of the rear sides of the L-shaped blocks, and rectangular blocks are fixedly connected to the front ends of the rotating rods. According to the invention, whether the position of the electronic component welded on the PCB deviates or not can be rapidly detected, and whether the deviation range of the electronic component is within an allowable range or not can be judged, so that the deviation degree of the electronic component welded on the PCB can be judged.

Description

Technical Field

[0001] The invention relates to the technical field of SMT mounting detection, in particular to an intelligent re-inspection machine for SMT surface mounting. Background Art

[0002] SMT is a circuit assembly technology that mounts pinless or short-lead surface-mount components on the surface of a printed PCB or other substrate, and assembles them by soldering through reflow soldering or dip soldering.

[0003] The existing detection of PCB mounting includes stability detection and offset detection. Stability detection is the detection of the stability of components on the PCB, and offset detection is the detection of the accuracy of components on the PCB. The existing method mainly uses inspection personnel to observe or use image acquisition equipment to obtain and analyze the mounting conditions of the PCB. Although the purpose of SMT mounting detection can be achieved, the mounting error of electronic components is very small and it is difficult to directly observe it through images. It is impossible to accurately obtain the degree of offset of electronic components on the PCB, and it is impossible to effectively judge whether the range of electronic component offset is within the allowable range (different electronic components have different allowable error ranges, such as the width range of pins or leads);

[0004] The present invention proposes an intelligent re-inspection machine for SMT surface mounting, which can quickly detect whether the position of electronic components soldered on a PCB board is offset, and can determine whether the range of the electronic component offset is within an allowable range, thereby determining the degree of offset of the electronic components soldered on the PCB circuit board. Summary of the invention

[0005] The object of the present invention is to provide an intelligent re-inspection machine for SMT surface mounting, which can quickly detect whether the position of electronic components soldered on a PCB board is offset, and can determine whether the range of the electronic component offset is within the allowable range, thereby determining the degree of offset of the electronic components soldered on the PCB circuit board.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: an intelligent re-inspection machine for SMT surface mounting, comprising a bottom plate and a PCB circuit board for detection, the bottom plate is provided with a detection mechanism, the detection mechanism comprises two first electric telescopic rods fixedly mounted on the bottom plate, the output end of the first electric telescopic rod is fixedly connected to a connection block, the outer side of the connection block is fixedly connected to an L-shaped plate, a crossbeam is fixedly connected between the two L-shaped plates, and a plurality of detection units are fixedly connected to the front side of the crossbeam;

[0007] Each detection unit includes two L-shaped blocks, a rotating rod is rotatably connected to the inner wall of the rear side of the L-shaped block, a rectangular block is fixedly connected to the front end of the rotating rod, a trapezoidal block is fixedly connected to the bottom of the rectangular block, an inclined surface is provided at the bottom of the trapezoidal block, a tension spring is fixedly connected between the side wall of the L-shaped block and the corresponding rectangular block, a cylinder is fixedly connected to the top of the rectangular block, and in an initial state, the cylinder is perpendicular to the bottom plate. The position and width W between the two trapezoidal blocks in each detection unit match the width and position of the corresponding electronic components. When the electronic components are not offset, the trapezoidal blocks can slide downward from the side of the electronic components. When the electronic components are offset, the inclined surface in one of the trapezoidal blocks in the detection unit will contact the electronic components downward, and the cylinder will tilt.

[0008] In the present invention, the installation position of the detection unit corresponds to the position of the electronic components on the fixed PCB circuit board. In the process of the trapezoidal block probing downward, the inclination of the cylinder is increased by the lever structure to amplify the offset value of the electronic components, thereby realizing sensitive detection.

[0009] The present invention can quickly detect whether the position of the electronic component soldered on the PCB circuit board is offset, and can determine whether the range of the electronic component offset is within the allowable range, thereby determining the degree of offset of the electronic component soldered on the PCB circuit board.

[0010] When in use, the welded PCB is placed between the two U-shaped clamps, and the second electric telescopic rod is started. The second electric telescopic rod drives the corresponding U-shaped clamp to work, and the two U-shaped clamps move toward each other and fix the PCB.

[0011] The allowable offset errors of electronic components of different sizes when soldered on PCB circuit boards are different. When the allowable offset error of electronic components is small, the error range of the detection unit is determined by the width of the set sheet, which represents the allowable error of the electronic components. In this case, there is no need to adjust the rotation angle of the sheet. The motor is started to drive the rectangular seat to slide on the outside of the two positioning rods through the rotation of the screw rod. The rectangular seat drives the U-shaped seat to move. The U-shaped seat drives the laser transmitter and the laser receiver to move to the front and rear sides of the left sheet corresponding to the electronic components respectively. The first electric telescopic rod is started to drive the L-shaped plate to move downward through the connecting block. The L-shaped plate is driven by the crossbeam belt The L-shaped block moves downward, and the L-shaped block drives the trapezoidal block to move downward. When the trapezoidal block slides downward from the left side of the electronic component, the sheet does not tilt, the laser emitted by the laser transmitter is blocked by the sheet, and the laser receiver cannot receive the emitted laser. Similarly, the motor is started again, so that the U-shaped seat drives the laser transmitter and the laser receiver to move to the front and rear sides of the right sheet corresponding to the electronic component respectively. Similarly, the first electric telescopic rod is started, so that the rectangular block drives the trapezoidal block to move downward. When the trapezoidal block slides downward from the right side of the electronic component, it is determined that the electronic component is installed properly. Repeat the steps to detect the next electronic component.

[0012] Further preferably, a screw is rotatably connected between the two L-shaped plates, the outer side of the screw is threadedly connected to a rectangular seat, the front side of the rectangular seat is fixedly connected to a U-shaped seat, and a laser transmitter and a laser receiver are fixedly connected to the front inner wall and the rear inner wall of the U-shaped seat respectively, and when there is no obstruction between the laser transmitter and the laser receiver, the laser transmitter emits laser and the laser receiver can receive the laser.

[0013] When the trapezoidal block slides downward from the right side of the electronic component and contacts the electronic component, the trapezoidal block rotates, and the trapezoidal block drives the cylinder to rotate through the rectangular block. The trapezoidal block and the cylinder are both connected to the rotating rod through the rectangular block. The trapezoidal block and the cylinder rotate through the rotating rod to form a lever structure, and the longer length of the cylinder has the effect of effectively amplifying the error of the electronic component offset. The cylinder drives the thin sheet to rotate through the rotation of the round rod. The width of the thin sheet determines the error range of the detection unit and represents the allowable error of the electronic component. When the angle of rotation of the trapezoidal block is small, the angle of rotation of the thin sheet driven by the cylinder is small. At this time, the laser emitted by the laser transmitter is still blocked by the thin sheet, and the laser receiver cannot receive the emitted laser. At this time, although the electronic component is offset, it is within the allowable offset error range and is a qualified product. When the angle of rotation of the trapezoidal block is large, the laser receiver can receive the laser emitted by the laser transmitter. The electronic component is offset beyond the allowable offset error. At this time, the laser receiver sends information to the control panel, and the control panel displays unqualified electronic components soldered on the PCB circuit board.

[0014] Further preferably, the detection mechanism also includes a detection accuracy adjustment component, the detection accuracy adjustment component includes a cavity and a thin sheet, the cylinder is provided with a cavity, the bottom inner wall of the cavity is rotatably connected to a circular seat, the top of the circular seat is fixedly connected to a square rod, the outer side of the square rod is slidably connected to a round rod, the top of the round rod extends to the top of the corresponding cylinder and is fixedly connected to a thin sheet.

[0015] Further preferably, a motor is fixedly connected to the left side of one of the L-shaped plates on the left side, and the end of the output shaft of the motor is fixedly connected to the left end of the screw rod.

[0016] Further preferably, two positioning rods are fixedly connected between the two L-shaped plates on one side close to each other, and the rectangular seat is slidably sleeved on the outside of the two positioning rods.

[0017] Further preferably, a spring is fixedly connected between the top of the circular seat and the bottom end of the round rod, and the spring is movably sleeved on the outside of the square rod.

[0018] Further preferably, the cylindrical sliding sleeve is arranged on the outside of the round rod, the outside of the round rod is fixedly connected with a horizontal plate, the bottom of the horizontal plate is fixedly connected with a pointer, and the top of the cylinder is fixedly connected with a circular scale plate. The thin sheet is pinched to move upward and rotate, and the thin sheet drives the horizontal plate to move upward and rotate through the round rod. At this time, under the action of the scale lines set on the circular scale plate, the horizontal plate drives the pointer to rotate to the maximum value allowed for the position deviation of the electronic component.

[0019] When the allowable offset error of electronic components is large, the rotation angle of the sheet can be adjusted according to actual conditions. Under the action of the lever structure, the tilt angle of the sheet determines the detection error. When the sheet blocking surface becomes wider, it needs to be tilted at a larger angle so that the laser receiver can receive the laser emitted by the laser transmitter. At this time, pinch the sheet to drive the round rod upward, and the round rod drives the round block upward through the L-shaped rod to separate from the rubber ring. The round rod slides on the outside of the square rod and stretches the spring. Then the sheet is rotated. The sheet drives the horizontal plate to rotate through the round rod, and the horizontal plate drives the pointer to rotate. Under the action of the scale lines set on the circular scale plate, the horizontal plate drives the pointer to rotate to the maximum value allowed by the larger electronic component position deviation, so that the blocking surface of the rotated thin sheet becomes wider. When the thin sheet rotates to a suitable position, the tension on the thin sheet is released, and the spring in the stretched state is reset. The elastic force of the spring drives the round rod to move downward, and the round rod drives the two L-shaped rods to move downward. The L-shaped rod drives the corresponding round block to move downward. The bottom of the round block contacts the top of the rubber ring. Under the action of friction between the round block and the rubber ring, the rotated thin sheet is fixed.

[0020] Repeat the steps in the same way, start the first electric telescopic rod to drive the trapezoidal block to move downward, and detect the next electronic component. When the trapezoidal block slides downward from the outside of the electronic component without contacting the electronic component, it is determined that the next electronic component is installed properly;

[0021] The trapezoidal blocks touch the electronic components downward, and the laser emitted by the laser transmitter is blocked by the thin sheet with wider blocking surface. It is within the allowable offset error range and is a qualified product. When the laser emitted by the laser transmitter is not blocked and the laser receiver can receive the laser emitted by the laser transmitter, the installation of the next electronic component is unqualified.

[0022] Further preferably, L-shaped rods are fixedly connected to both sides of the round rod, a round block is fixedly connected to the bottom of the L-shaped rod, a rubber ring is fixedly connected to the bottom inner wall of the cavity, and the bottom of the round block contacts the top of the rubber ring.

[0023] Further preferably, two support plates are fixedly connected to the top of the base plate, and the sides of the two support plates close to each other are fixedly connected to the second electric telescopic rod, and the output end of the second electric telescopic rod is fixedly connected to a U-shaped clamping plate, and the two sides of the PCB circuit board are respectively in active contact with the inner walls of the two U-shaped clamping plates away from each other, and the top and bottom of the PCB circuit board are respectively slidably connected to the top inner wall and the bottom inner wall of the U-shaped clamping plate.

[0024] Further preferably, two supporting columns are fixedly connected to the top of the base plate, and the top ends of the two supporting columns are fixedly connected to the same control panel. The laser receiver receives the laser emitted by the laser transmitter and sends the information to the control panel, and the control panel displays unqualified electronic components mounted on the PCB circuit board.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention starts the motor to drive the rectangular seat to move by rotating the screw, and the rectangular seat drives the laser transmitter and the laser receiver to move through the U-shaped seat. The first electric telescopic rod is started to drive the trapezoidal block to move downward. When the trapezoidal block slides downward from the left side of the electronic component, the thin sheet does not tilt at this time, and the laser emitted by the laser transmitter is blocked by the thin sheet, and the laser receiver cannot receive the emitted laser. Similarly, the motor is started again, so that the U-shaped seat drives the laser transmitter and the laser receiver to move to the front and rear sides of the right thin sheet corresponding to the electronic component respectively. Similarly, the first electric telescopic rod is started, so that the rectangular block drives the trapezoidal block to move downward. When the trapezoidal block slides downward from the right side of the electronic component, it is determined that the electronic component is installed properly, and the steps are repeated to detect the next electronic component.

[0027] 2. In the present invention, when the trapezoidal block slides downward from the right side of the electronic component and contacts the electronic component, the trapezoidal block rotates, and the trapezoidal block drives the cylinder to rotate through the rectangular block. The cylinder drives the thin sheet to rotate through the round rod. When the angle of rotation of the trapezoidal block is small, the angle of rotation of the thin sheet driven by the cylinder is small. At this time, the laser emitted by the laser transmitter is still blocked by the thin sheet, and the laser receiver cannot receive the emitted laser. At this time, although the electronic component is shifted, it is within the allowable offset error range and is a qualified product. When the angle of rotation of the trapezoidal block is large, the laser receiver can receive the laser emitted by the laser transmitter, and the electronic component is shifted beyond the allowable offset error and is an unqualified electronic component.

[0028] 3. In the present invention, when the allowable offset error of the electronic components is large, the thin sheet is pinched to drive the round rod to move upward, and the round rod drives the round block to move upward and separate from the rubber ring through the L-shaped rod. The round rod slides on the outside of the square rod and stretches the spring. Then the thin sheet is rotated, and the thin sheet drives the horizontal plate to rotate through the round rod, and the horizontal plate drives the pointer to rotate. Under the action of the scale lines set on the circular scale plate, the horizontal plate drives the pointer to rotate to the maximum value allowed for the larger electronic component position offset, so that the blocking surface of the thin sheet becomes wider after rotation.

[0029] 4. Repeat the steps, start the first electric telescopic rod to drive the trapezoidal block to move downward, and detect the next electronic component. When the trapezoidal block slides downward from the outside of the electronic component without contacting the electronic component, it is determined that the next electronic component is installed qualifiedly. When the trapezoidal block contacts the electronic component downward from the electronic component, the laser emitted by the laser transmitter is blocked by the widened thin sheet of the blocking surface, it is within the allowable offset error range and is a qualified product. When the laser emitted by the laser transmitter is not blocked and the laser receiver can receive the laser emitted by the laser transmitter, the next electronic component is installed unqualified. It can quickly detect whether the position of the electronic component soldered on the PCB circuit board is offset, and can determine whether the range of the electronic component offset is within the allowable range, thereby determining the offset degree of the electronic component soldered on the PCB circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the main stereoscopic structure of the present invention;

[0031] Figure 2 It is a rear-view stereoscopic structural schematic diagram of the present invention;

[0032] Figure 3 It is a front view structural schematic diagram of the present invention;

[0033] Figure 4 It is a three-dimensional diagram of the connection of the rectangular block, the trapezoidal block and the cylinder in the present invention;

[0034] Figure 5 A three-dimensional diagram showing the connection between the L-shaped plate and the screw rod in the present invention;

[0035] Figure 6 It is a three-dimensional diagram of the connection between the U-shaped seat, the laser transmitter and the laser receiver in the present invention;

[0036] Figure 7 It is a schematic diagram of the internal cross-sectional structure of a cylinder in the present invention;

[0037] Figure 8 It is a three-dimensional diagram of the connection of the horizontal plate, the pointer and the circular scale plate in the present invention;

[0038] Fig. 9 It is a schematic diagram of the connection between the PCB circuit board and the electronic components in the present invention.

[0039] In the figure:

[0040] 1. Bottom plate; 101. First electric telescopic rod; 102. Connecting block; 103. L-shaped plate; 104. Crossbeam; 105. L-shaped block; 106. Rotating rod; 107. Rectangular block; 108. Trapezoidal block; 109. Tension spring; 110. Cylinder; 111. Screw rod; 112. Rectangular seat; 113. U-shaped seat; 114. Laser transmitter; 115. Laser receiver; 116. Motor; 117. Positioning rod;

[0041] 2. Cavity; 201. Round seat; 202. Square rod; 203. Round rod; 204. Thin sheet; 205. Spring; 206. Horizontal plate; 207. Pointer; 208. Circular scale plate; 209. L-shaped rod; 210. Round block; 211. Rubber ring;

[0042] 3. Support plate; 4. Second electric telescopic rod; 5. U-shaped clamp; 6. PCB circuit board; 7. Control panel (wherein the x-axis represents the left and right direction, the arrow direction is right, the y-axis represents the up and down direction, the arrow direction is up, and the z-axis represents the front and back direction, the arrow direction is back). DETAILED DESCRIPTION

[0043] 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.

[0044] For examples, see Figure 1-9The present invention provides a technical solution: an intelligent re-inspection machine for SMT surface mounting, comprising a bottom plate 1 and a PCB circuit board 6 for detection, a detection mechanism is provided on the bottom plate 1, and the detection mechanism comprises two first electric telescopic rods 101 fixedly mounted on the bottom plate 1, an output end of the first electric telescopic rod 101 is fixedly connected with a connecting block 102, an outer side of the connecting block 102 is fixedly connected with an L-shaped plate 103, a crossbeam 104 is fixedly connected between the two L-shaped plates 103, and a plurality of detection units are fixedly connected to the front side of the crossbeam 104;

[0045] Each detection unit includes two L-shaped blocks 105, and a rotating rod 106 is rotatably connected to the inner wall of the rear side of the L-shaped block 105, and a rectangular block 107 is fixedly connected to the front end of the rotating rod 106. A trapezoidal block 108 is fixedly connected to the bottom of the rectangular block 107, and there is an inclined surface at the bottom of the trapezoidal block 108. A tension spring 109 is fixedly connected between the side wall of the L-shaped block 105 and the corresponding rectangular block 107, and a cylinder 110 is fixedly connected to the top of the rectangular block 107. In the initial state, the cylinder 110 is perpendicular to the base plate 1. The position and width W between the two trapezoidal blocks 108 in each detection unit match the width and position of the corresponding electronic components. When the electronic components are not offset, the trapezoidal block 108 can slide downward from the side of the electronic components. When the electronic components are offset, the inclined surface in one of the trapezoidal blocks 108 in the detection unit will contact the electronic components downward, and the cylinder 110 will tilt.

[0046] In the present invention, the installation position of the detection unit corresponds to the position of the electronic components on the fixed PCB circuit board 6. During the downward movement of the trapezoidal block 108, the inclination of the cylinder 110 is increased by the lever structure to amplify the offset value of the electronic components, thereby realizing sensitive detection.

[0047] The present invention can quickly detect whether the position of the electronic component soldered on the PCB circuit board 6 is offset, and can determine whether the range of the electronic component offset is within the allowable range, thereby determining the degree of offset of the electronic component soldered on the PCB circuit board 6.

[0048] When in use, the welded PCB circuit board 6 is placed between the two U-shaped clamping plates 5, and the second electric telescopic rod 4 is started. The second electric telescopic rod 4 drives the corresponding U-shaped clamping plate 5 to work, and the two U-shaped clamping plates 5 move toward each other and fix the PCB circuit board 6;

[0049] The allowable offset errors of electronic components of different sizes soldered on the PCB circuit board 6 are different. When the allowable offset error of the electronic component is small, the error range of the detection unit is determined by the width of the thin sheet 204, which represents the allowable error of the electronic component. In this case, there is no need to adjust the rotation angle of the thin sheet 204. The motor 116 is started to rotate the screw 111 to drive the rectangular seat 112 to slide on the outside of the two positioning rods 117. The rectangular seat 112 drives the U-shaped seat 113 to move. The U-shaped seat 113 drives the laser transmitter 114 and the laser receiver 115 to move to the front and rear sides of the left thin sheet 204 corresponding to the electronic component, respectively. The first electric telescopic rod 101 is started to drive the L-shaped plate 103 to move downward through the connecting block 102. The L-shaped plate 103 is driven by the crossbeam 104. The L-shaped block 105 is moved downward, and the L-shaped block 105 drives the trapezoidal block 108 to move downward. When the trapezoidal block 108 slides downward from the left side of the electronic component, the sheet 204 does not tilt, and the laser emitted by the laser emitter 114 is blocked by the sheet 204, and the laser receiver 115 cannot receive the emitted laser. Similarly, the motor 116 is started again, so that the U-shaped seat 113 drives the laser emitter 114 and the laser receiver 115 to move to the front and rear sides of the right sheet 204 corresponding to the electronic component, respectively. Similarly, the first electric telescopic rod 101 is started, so that the rectangular block 107 drives the trapezoidal block 108 to move downward. When the trapezoidal block 108 slides downward from the right side of the electronic component, it is determined that the electronic component is installed properly, and the steps are repeated to detect the next electronic component.

[0050] In this embodiment, specifically: a screw rod 111 is rotatably connected between the two L-shaped plates 103, a rectangular seat 112 is threadedly connected to the outer side of the screw rod 111, a U-shaped seat 113 is fixedly connected to the front side of the rectangular seat 112, and a laser transmitter 114 and a laser receiver 115 are fixedly connected to the front inner wall and the rear inner wall of the U-shaped seat 113, respectively. When there is no obstruction between the laser transmitter 114 and the laser receiver 115, the laser transmitter 114 emits laser light and the laser receiver 115 can receive laser light;

[0051] When the trapezoidal block 108 slides downward from the right side of the electronic component and contacts the electronic component, the trapezoidal block 108 rotates, and the trapezoidal block 108 drives the cylinder 110 to rotate through the rectangular block 107. The trapezoidal block 108 and the cylinder 110 are both rotatably connected to the rotating rod 106 through the rectangular block 107. The trapezoidal block 108 and the cylinder 110 rotate through the rotating rod 106 to form a lever structure, and the long length of the cylinder 110 has the effect of effectively amplifying the error of the electronic component offset. The cylinder 110 drives the thin sheet 204 to rotate through the round rod 203. The width of the thin sheet 204 determines the error range of the detection unit and represents the allowable error of the electronic component. When the trapezoidal block 108 rotates, the cylinder 110 drives the thin sheet 204 to rotate. The width of the thin sheet 204 determines the error range of the detection unit and represents the allowable error of the electronic component. The rotation angle of the block 108 is small, and the rotation angle of the thin sheet 204 driven by the cylinder 110 is small. At this time, the laser emitted by the laser transmitter 114 is still blocked by the thin sheet 204, and the laser receiver 115 cannot receive the emitted laser. At this time, although the electronic components are offset, they are within the allowable offset error range and are qualified products. When the angle of rotation of the trapezoidal block 108 is large, the laser receiver 115 can receive the laser emitted by the laser transmitter 114, and the electronic components are offset beyond the allowable offset error. At this time, the laser receiver 115 sends information to the control panel 7, and the control panel 7 displays unqualified electronic components soldered on the PCB circuit board 6.

[0052] In this embodiment, specifically: the detection mechanism also includes a detection accuracy adjustment component, the detection accuracy adjustment component includes a cavity 2 and a thin sheet 204, the cylinder 110 is provided with a cavity 2, the bottom inner wall of the cavity 2 is rotatably connected with a circular seat 201, the top of the circular seat 201 is fixedly connected with a square rod 202, the outer side of the square rod 202 is slidably connected with a round rod 203, the top of the round rod 203 extends to the top of the corresponding cylinder 110 and is fixedly connected with a thin sheet 204;

[0053] In this embodiment, specifically: a motor 116 is fixedly connected to the left side of a left L-shaped plate 103, and the output shaft end of the motor 116 is fixedly connected to the left end of the screw rod 111;

[0054] In this embodiment, specifically: two positioning rods 117 are fixedly connected between the two L-shaped plates 103 on one side close to each other, and the rectangular seat 112 is slidably sleeved on the outer sides of the two positioning rods 117;

[0055] In this embodiment, specifically: a spring 205 is fixedly connected between the top of the circular seat 201 and the bottom of the round rod 203, and the spring 205 is movably sleeved on the outer side of the square rod 202;

[0056] In this embodiment, specifically: the cylinder 110 is slidably sleeved on the outside of the round rod 203, the outside of the round rod 203 is fixedly connected with a horizontal plate 206, the bottom of the horizontal plate 206 is fixedly connected with a pointer 207, and the top of the cylinder 110 is fixedly connected with a circular scale plate 208. The thin sheet 204 is pinched to move upward and rotate, and the thin sheet 204 drives the horizontal plate 206 to move upward and rotate through the round rod 203. At this time, under the action of the scale lines set on the circular scale plate 208, the horizontal plate 206 drives the pointer 207 to rotate to the maximum value allowed by the position deviation of the electronic component;

[0057] When the allowable offset error of the electronic components is large, the rotation angle of the thin sheet 204 can be adjusted according to the actual situation. Under the action of the lever structure, the tilt angle of the thin sheet 204 determines the detection error. When the blocking surface of the thin sheet 204 becomes wider, it needs to be tilted at a larger angle so that the laser receiver 115 can receive the laser emitted by the laser transmitter 114. At this time, the thin sheet 204 is pinched to drive the round rod 203 to move upward. The round rod 203 drives the circular block 210 to move upward and separate from the rubber ring 211 through the L-shaped rod 209. The round rod 203 slides on the outside of the square rod 202 and stretches the spring 205. Then the thin sheet 204 is rotated. The thin sheet 204 drives the horizontal plate 206 to rotate through the round rod 203, and the horizontal plate 206 drives the pointer 207. Rotate, under the action of the scale lines set on the circular scale plate 208, the horizontal plate 206 drives the pointer 207 to rotate to the maximum value allowed by the larger electronic component position offset, so that the blocking surface of the rotated thin sheet 204 becomes wider. When the thin sheet 204 rotates to a suitable position, the tension on the thin sheet 204 is released, and the spring 205 in the stretched state is reset. The elastic force of the spring 205 drives the round rod 203 to move downward, and the round rod 203 drives the two L-shaped rods 209 to move downward. The L-shaped rod 209 drives the corresponding round block 210 to move downward. The bottom of the round block 210 contacts the top of the rubber ring 211. Under the action of the friction between the round block 210 and the rubber ring 211, the rotated thin sheet 204 is fixed;

[0058] Repeat the steps in the same way, start the first electric telescopic rod 101 to drive the trapezoidal block 108 to move downward, and detect the next electronic component. When the trapezoidal block 108 slides downward from the outside of the electronic component without contacting the electronic component, it is determined that the next electronic component is installed properly.

[0059] The trapezoidal block 108 contacts the electronic components downward, and the laser emitted by the laser emitter 114 is blocked by the thin sheet 204 whose blocking surface becomes wider. It is within the allowable offset error range and is a qualified product. When the laser emitted by the laser emitter 114 is not blocked and the laser receiver 115 can receive the laser emitted by the laser emitter 114, the installation of the next electronic component is unqualified.

[0060] In this embodiment, specifically: both sides of the round rod 203 are fixedly connected with L-shaped rods 209, the bottom of the L-shaped rod 209 is fixedly connected with a round block 210, the bottom inner wall of the cavity 2 is fixedly connected with a rubber ring 211, and the bottom of the round block 210 is in contact with the top of the rubber ring 211;

[0061] In this embodiment, specifically: two support plates 3 are fixedly connected to the top of the bottom plate 1, and the sides of the two support plates 3 close to each other are fixedly connected to the second electric telescopic rod 4, and the output end of the second electric telescopic rod 4 is fixedly connected to the U-shaped clamping plate 5, and the two sides of the PCB circuit board 6 are respectively in active contact with the inner walls of the sides of the two U-shaped clamping plates 5 away from each other, and the top and bottom of the PCB circuit board 6 are respectively slidably connected to the top inner wall and the bottom inner wall of the U-shaped clamping plate 5;

[0062] In this embodiment, specifically: two support columns are fixedly connected to the top of the base plate 1, and the top ends of the two support columns are fixedly connected to the same control panel 7, the laser receiver 115 receives the laser emitted by the laser transmitter 114 and sends the information to the control panel 7, and the control panel 7 displays unqualified electronic components mounted on the PCB circuit board 6.

[0063] 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. An intelligent re-inspection machine for SMT surface mounting, comprising a base plate (1) and a PCB circuit board (6) for inspection, characterized in that: The bottom plate (1) is provided with a detection mechanism, the detection mechanism comprising two first electric telescopic rods (101) fixedly mounted on the bottom plate (1), the output end of the first electric telescopic rod (101) being fixedly connected to a connection block (102), the outer side of the connection block (102) being fixedly connected to an L-shaped plate (103), a crossbeam (104) being fixedly connected between the two L-shaped plates (103), and a plurality of detection units being fixedly connected to the front side of the crossbeam (104); Each detection unit comprises two L-shaped blocks (105), a rotating rod (106) is rotatably connected to the inner wall of the rear side of the L-shaped block (105), a rectangular block (107) is fixedly connected to the front end of the rotating rod (106), a trapezoidal block (108) is fixedly connected to the bottom of the rectangular block (107), an inclined surface is present at the bottom of the trapezoidal block (108), a tension spring (109) is fixedly connected between the side wall of the L-shaped block (105) and the corresponding rectangular block (107), and the top of the rectangular block (107) is fixedly connected to the top of the rectangular block (107). A cylinder (110) is fixedly connected. In an initial state, the cylinder (110) is perpendicular to the bottom plate (1). The position and width W between the two trapezoidal blocks (108) in each detection unit match the width and position of the corresponding electronic component. When the electronic component is not offset, the trapezoidal block (108) can slide downward from the side of the electronic component. When the electronic component is offset, the inclined surface of one of the trapezoidal blocks (108) in the detection unit will contact the electronic component downward, and the cylinder (110) will tilt.

2. The intelligent re-inspection machine for SMT surface mounting according to claim 1, characterized in that: A screw rod (111) is rotatably connected between the two L-shaped plates (103); the outer side of the screw rod (111) is threadedly connected to a rectangular seat (112); the front side of the rectangular seat (112) is fixedly connected to a U-shaped seat (113); a laser transmitter (114) and a laser receiver (115) are respectively fixedly connected to the front inner wall and the rear inner wall of the U-shaped seat (113); when there is no obstruction between the laser transmitter (114) and the laser receiver (115), the laser transmitter (114) emits laser light and the laser receiver (115) can receive the laser light.

3. The intelligent re-inspection machine for SMT surface mounting according to claim 2, characterized in that: A motor (116) is fixedly connected to the left side of one of the L-shaped plates (103) on the left side, and the end of the output shaft of the motor (116) is fixedly connected to the left end of the screw rod (111).

4. An intelligent SMT surface mount re-inspection machine according to any one of claims 1 to 3, characterized in that: The detection mechanism also includes a detection accuracy adjustment component, which includes a cavity (2) and a thin sheet (204), wherein the cylinder (110) is provided with a cavity (2), a circular seat (201) is rotatably connected to the inner wall of the bottom of the cavity (2), a square rod (202) is fixedly connected to the top of the circular seat (201), a round rod (203) is slidably connected to the outer side of the square rod (202), and the top end of the round rod (203) extends to the top of the corresponding cylinder (110) and is fixedly connected to the thin sheet (204).

5. The intelligent re-inspection machine for SMT surface mounting according to claim 4, characterized in that: Two positioning rods (117) are fixedly connected between the two L-shaped plates (103) on one side close to each other, and the rectangular seat (112) is slidably sleeved on the outside of the two positioning rods (117).

6. The intelligent SMT surface mount re-inspection machine according to claim 5, characterized in that: A spring (205) is fixedly connected between the top of the circular seat (201) and the bottom end of the round rod (203), and the spring (205) is movably sleeved on the outside of the square rod (202).

7. The intelligent SMT surface mount re-inspection machine according to claim 6, characterized in that: The cylinder (110) is slidably sleeved on the outer side of the round rod (203), the outer side of the round rod (203) is fixedly connected to a transverse plate (206), the bottom of the transverse plate (206) is fixedly connected to a pointer (207), and the top of the cylinder (110) is fixedly connected to a circular scale plate (208). The thin sheet (204) is pinched to move upward and rotate, and the thin sheet (204) drives the transverse plate (206) to move upward and rotate through the round rod (203). At this time, with reference to the scale lines set on the circular scale plate (208), the transverse plate (206) drives the pointer (207) to rotate to the maximum value allowed for the position deviation of the electronic component.

8. The intelligent SMT surface mount re-inspection machine according to claim 7, characterized in that: Both sides of the round rod (203) are fixedly connected to L-shaped rods (209), the bottom of the L-shaped rod (209) is fixedly connected to a round block (210), the bottom inner wall of the cavity (2) is fixedly connected to a rubber ring (211), and the bottom of the round block (210) is in contact with the top of the rubber ring (211).

9. The intelligent SMT surface mount re-inspection machine according to claim 8, characterized in that: Two support plates (3) are fixedly connected to the top of the bottom plate (1); the sides of the two support plates (3) close to each other are fixedly connected to a second electric telescopic rod (4); the output end of the second electric telescopic rod (4) is fixedly connected to a U-shaped clamping plate (5); the two sides of the PCB circuit board (6) are respectively in movable contact with the inner walls of the two U-shaped clamping plates (5) away from each other; the top and bottom of the PCB circuit board (6) are respectively slidably connected to the top inner wall and the bottom inner wall of the U-shaped clamping plate (5).

10. The intelligent SMT surface mount re-inspection machine according to claim 9, characterized in that: Two support columns are fixedly connected to the top of the base plate (1); the top ends of the two support columns are fixedly connected to a control panel (7); a laser receiver (115) receives laser light emitted by a laser transmitter (114) and sends information to the control panel (7); and the control panel (7) displays unqualified electronic components mounted on a PCB circuit board (6).

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