An automatic positioning and pasting SMT patch device

Abstract

The application relates to the technical field of SMT patches, and discloses an automatic positioning and attaching SMT patch device, which comprises a mechanical arm head, extension plates arranged at two ends of the mechanical arm head, rotating shafts arranged between the extension plates, adjusting plates arranged on outer walls of the rotating shafts, suction nozzles arranged at lower ends of the adjusting plates, secondary positioning units arranged between outer walls of the suction nozzles and the adjusting plates, and the secondary positioning units comprising positioning components arranged on the outer walls of the suction nozzles and rotating components; through the cooperation of the 180 DEG-rotatable adjusting plates and the sliding positioning structure, after the suction nozzles initially adsorb elements, the multi-directional positioning blocks are synchronously enclosed and limited, vacuum adsorption is temporarily released, and the patch posture is re-regularized, so that slight deviation and angle deviation generated in the early stage of grabbing are effectively corrected, the center position of the patch and the placing angle are completely up to the standard, and the problem of patching deviation is avoided.

Description

Technical Field

[0001] This invention relates to the technical field of SMT (Surface Mount Technology) assembly, and more particularly to an automatic positioning and bonding SMT assembly device. Background Technology

[0002] With the rapid development of electronic devices towards miniaturization, high density, and high performance, surface mount technology (SMT) has become the core assembly technology of the electronics manufacturing industry. As the core equipment of the surface mount production line, the SMT placement equipment (pick-and-place machine) directly determines the production efficiency and product quality of electronic products through its placement speed, accuracy, and stability. It is widely used in many fields such as consumer electronics, automotive electronics, aerospace, and medical devices.

[0003] Currently, existing SMT placement equipment mainly includes a feeding system, a placement head, a vision positioning system, a PCB conveying and positioning system, a drive system, and a control system. Its workflow is roughly as follows: the PCB is transported to the designated position and positioned by a conveyor belt; the feeding system transports electronic components according to preset rules; the placement head vacuum-grabs the components through a nozzle; after the vision system corrects the positional deviation between the components and the PCB, the components are accurately placed onto the PCB pads, completing a single placement action and repeating the operation.

[0004] When the nozzle vacuum picks up the component after visual positioning, the brief transition contact between the component and the nozzle may cause slight positional and angular misalignment, leading to several adverse effects: First, it can cause misalignment, preventing the component from accurately landing on the PCB pads, resulting in misalignment, incorrect placement, and other defects, leading to PCB scrap and rework. Second, it can cause defects such as tombstoning and component lifting, and misalignment between the pins of precision components and the pads can easily lead to cold solder joints, false solder joints, solder bridging, and short circuits, causing electrical faults on the circuit board. Third, uneven placement force can damage the component body and pins, and cause solder paste overflow and solder balls, affecting the cleanliness of the board surface. Fourth, it can cause the failure of visual secondary correction, reduce production efficiency, increase component rejection losses, and result in poor quality consistency of batch products, increasing the workload of quality inspection and maintenance, accelerating nozzle wear, and increasing equipment operation and maintenance costs. Summary of the Invention

[0005] In view of the problem that the existing technology may cause the SMT chip to shift during the suction process of the nozzle, an automatic positioning and bonding SMT chip placement device is proposed.

[0006] This application provides an automatic positioning and bonding SMT placement device, the purpose of which is to: utilize a 180° rotatable adjustment plate in conjunction with a sliding positioning structure, after the nozzle initially picks up the component, the multi-directional positioning blocks synchronously surround and limit the position, briefly release the vacuum adsorption and readjust the placement posture, effectively correct the slight offset and angular deviation caused by the initial gripping, ensure that the center position and placement angle of the component are completely up to standard, and avoid placement misalignment problems.

[0007] The technical solution of the present invention is as follows: an automatic positioning and bonding SMT placement device, including a robotic arm head, extension plates disposed at both ends of the robotic arm head, a rotating shaft disposed between the extension plates, an adjustment plate disposed on the outer wall of the rotating shaft, a nozzle disposed at the lower end of the adjustment plate, and further including a secondary positioning unit disposed between the outer wall of the nozzle and the adjustment plate, wherein the secondary positioning unit includes a positioning component and a rotating component disposed on the outer wall of the nozzle;

[0008] The positioning component includes a telescopic spring disposed on the side of the adjustment plate near the head of the robotic arm, a mounting plate disposed on the upper end of the telescopic spring, connecting plates disposed on both ends of the mounting plate, a sliding ring frame disposed between the two connecting plates, servo cylinders evenly and equidistantly installed at the lower end of the sliding ring frame with the center of the sliding ring frame as the axis, a positioning block disposed on the telescopic end of the servo cylinder, a limit component installed inside the positioning block, and a motion component installed between the extension plate and the connecting plate;

[0009] The limiting component includes an installation groove inside the positioning block, trigger blocks slidably disposed in the side walls of the positioning block, a vertical plate and a horizontal plate disposed in the installation groove, a connecting spring one disposed between the trigger block and the vertical plate, a transmission block disposed on the horizontal plate, a connecting spring two disposed between the transmission block and the horizontal plate, a pressing block disposed on the side wall of the transmission block, a limiting block disposed on the side wall of the positioning block, a reset spring disposed between the limiting block and the transmission block, and a mating element installed on the outer wall of the suction nozzle.

[0010] Furthermore, the mating element includes a mating ring disposed on the outer wall of the suction nozzle, and mating rods evenly and equidistantly disposed on the outer wall of the mating ring with the center of the mating ring as the axis.

[0011] Furthermore, during the vertical movement of the multiple trigger blocks, their outer walls will come into contact with and be pressed against the corresponding mating rods.

[0012] Furthermore, the motion component includes a protruding rod disposed on the side wall of the connecting plate and an arcuate groove formed on the side wall of the extension plate, with one end of the protruding rod located inside the corresponding arcuate groove.

[0013] Furthermore, the arc-shaped groove is divided into two sections. The first section of the arc-shaped groove is a normal circle with a radius equal to the radius of the deflection of the protrusion when the adjusting plate rotates. The second section is arc-shaped with an arc radius greater than the radius of the first circular section.

[0014] Furthermore, a servo motor is installed on the outer wall of the extension plate, a bevel gear one is installed at one end of the rotating shaft, and a bevel gear two is installed at the drive end of the servo motor, with the bevel gear one and bevel gear two meshing with each other.

[0015] Furthermore, a connecting solenoid valve is installed on the side wall of the adjusting plate, and a vacuum pump is installed on the head of the robotic arm. The outer end of the connecting solenoid valve is connected to the vacuum pump through a hose, and the other end of the connecting solenoid valve is connected to the suction nozzle.

[0016] The beneficial effects of this invention are:

[0017] 1. By mounting the nozzle on a 180° rotatable adjustment plate, after the nozzle initially picks up the component and completes the transfer, the rotation of the adjustment plate drives the sliding ring frame and surrounding positioning blocks to move synchronously. With the nozzle's suction force briefly deactivated, the positioning blocks complete the all-around alignment and correction of the component, effectively eliminating minor positional deviations and angular misalignments that occur during the initial gripping process. This secondary positioning method recalibrates the component's center position and placement posture, overcoming the limitations of traditional single-stage visual positioning. It avoids component displacement during transfer from the outset, ensuring a consistent component reference position, significantly reducing placement alignment errors, meeting the high-precision placement requirements of micro-precision electronic components, and effectively improving various placement defects caused by component misalignment.

[0018] 2. This structure, relying on positioning blocks and limiting blocks, enables vertical positioning and horizontal centering of the component. During secondary positioning, it comprehensively constrains the component's movement space, preventing abnormalities such as shaking, slippage, and flipping during movement and alignment. The precisely aligned component can then smoothly align with the pre-set pads on the PCB during subsequent mounting operations, effectively solving common component placement problems such as component misalignment, tombstoning, and sideways placement. It also avoids soldering defects such as cold solder joints, empty solder joints, and short circuits caused by misaligned pins of precision components, reducing component damage and solder paste overflow. This stabilizes and improves the overall quality of component placement processing, reduces product rework rates and material waste, and is suitable for high-standard electronic product manufacturing.

[0019] 3. The entire positioning assembly can be synchronously driven to complete the positioning action by adjusting the plate rotation. The whole adopts a linkage mechanical transmission structure, eliminating the need for additional multiple sets of drive control components. The overall structure is compact and simple, easy to assemble and debug, and has low modification and usage costs. The entire secondary positioning process can be completed synchronously with the original chip placement operation rhythm without occupying too much additional production time or significantly affecting the original chip placement production speed of the equipment. It can maintain an efficient production rhythm while ensuring positioning accuracy. At the same time, this positioning structure can be adapted to various conventional chip components, has strong versatility, good operational stability, low failure rate, and is easy to maintain. It can be used stably for a long time in large-scale continuous chip placement production operations. Attached Figure Description

[0020] Figure 1 This is a first-view three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a second-view three-dimensional structural diagram of the present invention;

[0022] Figure 3 For the present invention Figure 2 Frontal view of the planar structure diagram;

[0023] Figure 4 This is a schematic diagram of the mating element structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the positioning component structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the sliding ring frame mounting structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the position structure of the positioning block and the mating rod of the present invention;

[0027] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point A in the middle;

[0028] Figure 9 This is a partial sectional view of the positioning block of the present invention from the side.

[0029] Figure 10 This is a schematic diagram of the arc-shaped groove planar structure of the present invention.

[0030] In the picture:

[0031] 1. Robotic arm head; 2. Extension plate; 3. Rotating shaft; 4. Adjusting plate; 5. Suction nozzle; 101. Telescopic spring; 102. Mounting plate; 103. Connecting plate; 104. Sliding ring frame; 105. Servo cylinder; 106. Positioning block; 201. Trigger block; 202. Vertical plate; 203. Horizontal plate; 204. Connecting spring one; 205. Transmission block; 206. Connecting spring two; 207. Pressing block; 208. Limiting block; 209. Reset spring; 210. Mating ring; 211. Mating rod; 301. Protruding rod; 302. Servo motor; 303. Bevel gear one; 304. Bevel gear two; 401. Connecting electric valve; 402. Arc groove. Detailed Implementation

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] Example 1, referring to Figures 1-5 as well as Figures 6-9 The first embodiment of the present invention provides an automatic positioning and bonding SMT placement device, including a robotic arm head 1, extension plates 2 fixedly installed at both ends of the robotic arm head 1, a rotating shaft 3 rotatably installed between the extension plates 2, an adjustment plate 4 fixedly installed on the outer wall of the rotating shaft 3, a nozzle 5 fixedly installed at the lower end of the adjustment plate 4, and a secondary positioning unit installed between the outer wall of the nozzle 5 and the adjustment plate 4. The secondary positioning unit includes a positioning component and a rotating component installed on the outer wall of the nozzle 5.

[0034] The positioning components include a telescopic spring 101 fixedly installed on the side of the adjustment plate 4 near the robotic arm head 1, a mounting plate 102 fixedly installed on the upper end of the telescopic spring 101, connecting plates 103 fixedly installed on both ends of the mounting plate 102, a sliding ring frame 104 fixedly installed between the two connecting plates 103, a servo cylinder 105 fixedly installed at a uniform distance from the lower end of the sliding ring frame 104 with the center of the sliding ring frame 104 as the axis, a positioning block 106 fixedly installed on the telescopic end of the servo cylinder 105, a limit component installed inside the positioning block 106, and a motion component installed between the extension plate 2 and the connecting plate 103.

[0035] The limiting assembly includes a mounting groove inside the positioning block 106, a trigger block 201 slidably mounted in the side walls of the positioning block 106, a vertical plate 202 and a horizontal plate 203 fixedly mounted in the mounting groove, a connecting spring 204 fixedly mounted between the trigger block 201 and the vertical plate 202, a transmission block 205 fixedly mounted on the horizontal plate 203, a connecting spring 206 fixedly mounted between the transmission block 205 and the horizontal plate 203, a pressing block 207 fixedly mounted on the side wall of the transmission block 205, a limiting block 208 fixedly mounted on the side wall of the positioning block 106, a reset spring 209 fixedly mounted between the limiting block 208 and the transmission block 205, and a mating element mounted on the outer wall of the suction nozzle 5.

[0036] Specifically, by setting up positioning components, the patch can be repositioned when it is transferred to the nozzle 5. This prevents the patch from shifting when it is transferred above the nozzle 5, which could lead to errors or short circuits in subsequent installation. Therefore, when the patch is transferred to the nozzle 5, it may shift horizontally during positioning. Thus, during the secondary positioning, the suction force of the nozzle 5 on the patch needs to be temporarily released, and the nozzle 5 needs to be adjusted to support the patch from below.

[0037] The positioning component works as follows: The rotation of the adjusting plate 4 drives the sliding ring frame 104 and the surrounding positioning blocks 106 to move synchronously. After the adjusting plate 4 rotates half a turn in the opposite direction, the suction nozzle 5 receives a signal and briefly closes. While the suction force of the suction nozzle 5 is briefly closed, the positioning blocks 106 complete the all-around alignment and correction of the patch, effectively eliminating minor positional deviations and angular misalignments that occur during the initial suction and gripping process. The center position and placement posture of the patch are recalibrated through this secondary positioning method. During the adsorption process of the nozzle 5, in order to prevent the positioning block 106 from affecting the normal adsorption of the nozzle 5, the end of the nozzle 5 needs to extend beyond the positioning block 106 to achieve normal adsorption. When the positioning block 106 needs to position it, the end of the positioning block 106 away from the nozzle 5 needs to extend beyond the nozzle 5 and the patch above it. Therefore, when the adjusting plate 4 rotates, it will drive the positioning block 106 to slide on the outer wall of the nozzle 5, so that one end of the positioning block 106 is opposite to one end of the nozzle 5, thereby ensuring that the multiple positioning blocks 106 can drive the four ends of the patch to be aligned and corrected during the movement.

[0038] Because the patch is not vertically limited during the positioning process, when the positioning block 106 slides a certain distance on the outer wall of the nozzle 5, the limiting block 208 will move outward a certain distance. The limiting block 208 is used to limit the patch vertically to prevent the patch from warping when the positioning block 106 adjusts the patch horizontally, thereby further improving the positioning accuracy and positioning efficiency.

[0039] By setting up positioning components, the limitations of traditional single-time positioning relying solely on vision can be eliminated. This avoids displacement of the components during transfer from the source, ensures uniformity of the component reference position, significantly reduces mounting alignment errors, meets the high-precision mounting production requirements of micro-precision electronic components, and effectively improves various mounting defects caused by component misalignment.

[0040] Example 2, refer to Figures 3-6 This is the second embodiment of the present invention, which differs from the first embodiment in that: the mating element includes a mating ring 210 fixedly installed on the outer wall of the suction nozzle 5, and mating rods 211 uniformly and equidistantly fixedly installed on the outer wall of the mating ring 210 with the center of the mating ring 210 as the axis. During the vertical movement of the multiple trigger blocks 201, they will all come into contact and press against the corresponding mating rods 211. The motion component includes a protruding rod 301 fixedly installed on the side wall of the connecting plate 103, and an arc-shaped groove 402 opened on the side wall of the extension plate 2. One end of the protruding rod 301 is located inside the corresponding arc-shaped groove 402. The arc-shaped groove 402 is divided into two sections. The first section of the arc-shaped groove 402 is a normal circle with a radius equal to the radius of the deflection of the protruding rod 301 when the adjusting plate 4 rotates. The second section is arc-shaped with an arc greater than the radius of the first circular section. A servo motor 302 is installed on the outer wall of the extension plate 2. A bevel gear 303 is installed at one end of the rotating shaft 3. A bevel gear 304 is installed at the drive end of the servo motor 302. The bevel gear 303 and the bevel gear 304 mesh with each other.

[0041] Specifically, the servo motor 302 is used to control the rotation of the adjustment plate 4. The servo motor 302 controls the adjustment plate 4 to rotate 180° at a time. This allows the relative position of the positioning block 106 and the suction nozzle 5 to be adjusted during the rotation of the adjustment plate 4. By setting the cooperation between the protruding rod 301 and the arc groove 402, before the adjustment plate 4 rotates, the protruding rod 301 is located at the second arc position of the arc groove 402. Since the arc position is larger than the radius of deflection of the protruding rod 301 during the rotation of the adjustment plate 4, the protruding rod 301 generates a downward pushing force on the mounting plate 102 at this time. At the same time, the telescopic spring 101 is in a stretched state. During the rotation of the adjustment plate 4, the protruding rod 301 moves with the arc groove 402 and moves to the first circular section. When it reaches the first circular section, the mounting plate 102 is reset under the elastic force of the telescopic spring 101. At the same time, the mounting plate 102 drives the sliding ring frame 104 to slide a distance along the outer wall of the suction nozzle 5 through the connecting plate 103, so that one end of the positioning block 106 exceeds the suction nozzle 5, which facilitates the subsequent positioning work.

[0042] Reference Figure 10The first arc position of the arc groove corresponds to region L1, and the second arc position corresponds to region L2. When the protruding rod 301 is located in the first region, the mounting plate 102 is in the normal deflection radius region. When it moves to the second arc region, the protruding rod 301 is subjected to the contact extrusion force of the second arc position, which causes the mounting plate 102 to undergo relative displacement.

[0043] The mating rod 211 and the trigger block 201 cooperate with each other. To prevent the positioning block 106 from being squeezed by the travel of the limiting block 208 against the patch during the movement of the sliding ring frame 104, a limiting component is set so that the limiting block 208 only extends after one end of the positioning block 106 has completely exceeded the nozzle 5 and the patch, thus limiting the patch in the vertical direction. Its working principle is as follows: when the positioning block 106 moves to the designated position with the sliding ring frame 104, the trigger block 201 and the mating rod 211 come into contact with each other, and the limiting block 208 is extended outward through transmission, thereby limiting the patch in the vertical direction.

[0044] The remaining structure is the same as that in Example 1.

[0045] Example 3, referring to Figures 1-2 This is the third embodiment of the present invention, which differs from the second embodiment in that: a connecting solenoid valve 401 is installed on the side wall of the adjusting plate 4, and a vacuum pump is installed on the robotic arm head 1. The outer end of the connecting solenoid valve 401 is connected to the vacuum pump via a flexible hose, and the other end of the connecting solenoid valve 401 is connected to the suction nozzle 5. The connecting solenoid valve 401 is electrically connected to the servo motor 302. When the servo motor 302 rotates 180° forward, the suction nozzle 5 rotates upward synchronously by 180°, and the connecting solenoid valve 401 briefly closes and then reopens. When the servo motor 302 rotates 180° in the opposite direction, the connecting solenoid valve 401 is unaffected.

[0046] Specifically, since it is necessary to ensure that the suction force of the nozzle 5 on the patch disappears briefly when adjusting the patch, the solenoid valve 401 is electrically connected to the servo motor 302 so that when the servo motor 302 rotates in the forward direction, the solenoid valve 401 closes for a specified time and then reopens. During the process of the servo motor 302 reversing and driving the adjustment plate 4 to reset, the solenoid valve 401 is not affected and maintains suction force on the patch to prevent the patch from falling off under the action of gravity.

[0047] The remaining structure is the same as that in Example 2.

[0048] Based on embodiments 1-3, the working principle of the present invention is as follows: In the initial state, the protruding rod 301 is located in the second section of the arc groove 402. At this time, the protruding rod 301 exerts an upward thrust on the mounting plate 102 under the limitation of the arc groove 402. At this time, the telescopic spring 101 is in a stretched state. At this time, the end of the suction nozzle 5 exceeds the end of the positioning block 106 above the sliding ring frame 104, so that the suction nozzle 5 can perform adsorption normally. After the suction nozzle 5 adsorbs the patch at its lower end, the servo motor 302 controls the second bevel gear 304 to rotate through the drive end. The second bevel gear 304 rotates through the first bevel gear 303 and the rotating shaft 3, driving the adjusting plate 4 to rotate 180° around the rotating shaft 3. During the rotation of the adjusting plate 4, the mounting plate 102 at its upper end and the protruding rod 301 on the side wall of the connecting plate 103 are deflected synchronously.

[0049] When the protruding rod 301 deflects to the first section of the arc groove 402, the protruding rod 301 is no longer limited by the arc groove 402. At this time, the mounting plate 102 quickly resets under the elastic force of the telescopic spring 101. During the reset process, the sliding ring frame 104 is driven to reset synchronously through the connecting plate 103. During the reset process, the positioning block 106 at its upper end moves synchronously, so that its end exceeds the end of the suction nozzle 5 and the patch. During the movement of the positioning block 106, the trigger blocks 201 on both sides of it contact each other with the mating rod 211 and generate pressure, so that the two trigger blocks 201 slide inward during the pressure process. During the sliding process, they exert upward pressure on the transmission block 205. After being subjected to force, the transmission block 205 slides upward and squeezes the limiting block 208 through the squeezing block 207. This causes the limiting block 208 to move outward during the squeezing process and limit the patch in the vertical direction.

[0050] When the adjusting plate 4 rotates 180°, the connecting solenoid valve 401 is briefly closed. At this time, the servo cylinder 105 drives the positioning block 106 to move synchronously in the vertical direction through the telescopic end. The multiple positioning blocks 106 have the same stroke and push the four sides of the patch inward, thereby performing secondary positioning of the patch. After the positioning is completed, the connecting solenoid valve 401 is opened to directly adsorb the positioned patch. After the servo cylinder 105 drives the positioning block 106 to reset, the drive end of the servo motor 302 drives the bevel gear 304 and the adjusting plate 4 to reset. Then the suction nozzle 5 can proceed to the next process of the patch.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An automatic positioning and bonding SMT placement device, comprising a robotic arm head (1), extension plates (2) disposed at both ends of the robotic arm head (1), a rotating shaft (3) disposed between the extension plates (2), an adjusting plate (4) disposed on the outer wall of the rotating shaft (3), and a nozzle (5) disposed at the lower end of the adjusting plate (4), characterized in that, It also includes a secondary positioning unit disposed between the outer wall of the suction nozzle (5) and the adjusting plate (4), the secondary positioning unit including a positioning component and a rotating component disposed on the outer wall of the suction nozzle (5); The positioning component includes a telescopic spring (101) disposed on the side of the adjustment plate (4) near the head (1) of the robotic arm, a mounting plate (102) disposed on the upper end of the telescopic spring (101), a connecting plate (103) disposed on both ends of the mounting plate (102), a sliding ring frame (104) disposed between the two connecting plates (103), a servo cylinder (105) evenly and equidistantly installed at the lower end of the sliding ring frame (104) with the center of the sliding ring frame (104) as the axis point, a positioning block (106) disposed on the telescopic end of the servo cylinder (105), a limit component installed inside the positioning block (106), and a motion component installed between the extension plate (2) and the connecting plate (103). The limiting component includes an installation groove inside the positioning block (106), a trigger block (201) slidably disposed in the side walls of the positioning block (106), a vertical plate (202) and a horizontal plate (203) disposed in the installation groove, a connecting spring one (204) disposed between the trigger block (201) and the vertical plate (202), a transmission block (205) disposed on the horizontal plate (203), a connecting spring two (206) disposed between the transmission block (205) and the horizontal plate (203), a pressing block (207) disposed on the side wall of the transmission block (205), a limiting block (208) disposed on the side wall of the positioning block (106), a reset spring (209) disposed between the limiting block (208) and the transmission block (205), and a mating element is installed on the outer wall of the suction nozzle (5).

2. The SMT placement device with automatic positioning and bonding according to claim 1, characterized in that, The mating element includes a mating ring (210) disposed on the outer wall of the suction nozzle (5), and mating rods (211) disposed evenly and equidistantly on the outer wall of the mating ring (210) with the center of the mating ring (210) as the axis.

3. The SMT placement device for automatic positioning and bonding according to claim 2, characterized in that, During the vertical movement of the multiple trigger blocks (201), their outer walls will come into contact with and be pressed against the corresponding mating rods (211).

4. The SMT placement device with automatic positioning and bonding according to claim 1, characterized in that, The motion component includes a protruding rod (301) disposed on the side wall of the connecting plate (103) and an arcuate groove (402) opened on the side wall of the extension plate (2), with one end of the protruding rod (301) located inside the corresponding arcuate groove (402).

5. An automatic positioning and bonding SMT placement device according to claim 4, characterized in that, The arc groove (402) is divided into two sections. The first section of the arc groove (402) is a normal circle with a radius equal to the radius of the deflection of the protrusion (301) when the adjusting plate (4) rotates. The second section is arc-shaped with an arc greater than the radius of the first circular section.

6. The SMT placement device for automatic positioning and bonding according to claim 1, characterized in that, A servo motor (302) is installed on the outer wall of the extension plate (2), a bevel gear (303) is installed at one end of the rotating shaft (3), and a bevel gear (304) is installed at the drive end of the servo motor (302). The bevel gear (303) and the bevel gear (304) mesh with each other.

7. The SMT placement device for automatic positioning and bonding according to claim 1, characterized in that, A connecting electric valve (401) is installed on the side wall of the adjusting plate (4), and a vacuum pump is installed on the robotic arm head (1). The outer end of the connecting electric valve (401) is connected to the vacuum pump through a hose, and the other end of the connecting electric valve (401) is connected to the suction nozzle (5).

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