Surface mounting execution mechanism of SMT chip mounter

Abstract

The invention relates to the technical field of circuit board manufacturing, in particular to a mounting execution mechanism of an SMT chip mounter, which comprises a central shaft, a visual detection device at the bottom of the central shaft, a plurality of connecting seats arranged around the central shaft and suction nozzles, and each suction nozzle is arranged on a mounting inclined surface of the corresponding connecting seat through a sliding mechanism; each connecting base is driven by an independent lifting driving device, the visual detection device obtains a PCB patch area image to determine the position, the suction nozzles are sequentially subjected to horizontal position fine adjustment through the sliding mechanism, and then the lifting driving devices descend to complete patch mounting. The multiple suction nozzles and the multiple connecting bases are arranged through the visual detection device surrounding the center shaft, the suction nozzles are arranged on the sliding mechanisms corresponding to the mounting slopes of the connecting bases, the suction nozzles are independently adjusted along the mounting slopes through the sliding mechanisms, and the connecting bases and the suction nozzles are axially moved along the center shaft through the lifting driving device. The execution end can actively adjust surface mounting according to visual positioning, and the surface mounting precision of components is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of circuit board manufacturing technology, and more specifically to a placement execution mechanism for an SMT pick and place machine. Background Technology

[0002] As the core equipment of the SMT production line, the SMT pick-and-place machine's core function is to accurately place surface mount components onto designated pads on the printed circuit board. A typical placement process includes: the placement head (placement execution mechanism) moves to the feeder area to pick up the component, and is then driven by the XY axis mechanism to move above the PCB board. Finally, based on the positioning data from the vision system, the component is placed onto the solder paste on the pad.

[0003] Most mainstream pick-and-place machines currently employ an "integrated moving" placement head design. This means all nozzles on the placement head function as a single unit, relying on a long-stroke XY-axis mechanism for wide-range movement to switch nozzle positions during material pickup and placement. However, to achieve long-distance movement between the pickup and placement areas, the X and Y axes typically require ultra-long lead screw guides. The resulting bending deformation due to their own weight and the thermal expansion effect at high speeds are difficult to completely avoid, directly causing the platform's positioning accuracy to decrease with increasing stroke. Furthermore, placement head positioning relies entirely on the direct drive of the XY-axis mechanism after a single global vision positioning. If the platform experiences even a slight positioning deviation due to the aforementioned factors, the nozzle end position will simultaneously show an error. This error accumulates continuously during the high-speed, high-density, fine-pitch component placement process, affecting overall placement accuracy and reliability.

[0004] Therefore, existing pick-and-place machines are limited by the inherent mechanical precision decay characteristics of long-stroke XY-axis mechanisms. When dealing with the high-density, high-precision PCB placement requirements, it is difficult to achieve fast and accurate component placement through single-shot vision positioning and direct drive of the XY-axis mechanism. Summary of the Invention

[0005] The purpose of this invention is to provide a placement execution mechanism for an SMT placement machine, in order to solve the technical problem in the prior art that the inherent mechanical precision decay characteristics of the long-stroke XY axis mechanism make it difficult to achieve fast and accurate component placement when dealing with high-density, high-precision PCB placement requirements through single vision positioning and direct drive of the XY axis mechanism.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: A placement actuator for an SMT pick and place machine includes: A central axis, with a visual inspection device at its bottom, is used to obtain image data of the patch area; Multiple suction nozzles are arranged around the central axis and connected to an external air pressure control device via a hose. A connector is provided around the outside of the central axis, and the connector is configured to be axially movable along the central axis. The connector has a mounting slope that slopes downward from the outside of the central axis toward the center of the patch area. Each nozzle is correspondingly disposed on the mounting slope of a connector via a sliding mechanism, so that the nozzle can slide along the mounting slope. A lifting drive device, wherein each of the connecting seats is independently connected to a lifting drive device, and a plurality of the lifting drive devices are arranged around the outside of the central axis so as to independently drive each of the connecting seats to move axially along the central axis; When the image data acquired by the vision inspection device determines the horizontal position of the mounting, the nozzle is moved to the corresponding horizontal position by the sliding mechanism, and the lifting drive device drives the connecting seat to move downward along the central axis to move the nozzle downward for mounting.

[0007] As a preferred embodiment of the present invention, the lifting drive device includes a first lead screw guide rail, which is driven by a motor disposed outside the central shaft; The connecting seat has a connecting part, which is connected to the first slider of the first lead screw guide rail. The first lead screw guide rail drives the connecting seat to move axially along the central axis through the first slider and the connecting part.

[0008] As a preferred embodiment of the present invention, a plurality of guide grooves are provided radially inward on the outer side of the main shaft, the plurality of guide grooves are equidistantly distributed around the peripheral wall of the main shaft, and each guide groove penetrates the bottom of the central shaft; The connecting seat protrudes outward on the side facing the central axis to form a strip-shaped protrusion. The strip-shaped protrusion is arranged parallel to the axis of the central axis and is inserted into the corresponding guide groove. The strip-shaped protrusion is configured to slide along the axial direction of the central axis in the guide groove.

[0009] As a preferred embodiment of the present invention, the slide rail mechanism includes a second lead screw guide rail, which is driven by a motor disposed on the connecting seat, and the second lead screw guide rail is disposed on the mounting inclined surface of the connecting seat; The second lead screw guide has a second slider, the first slider is connected to the nozzle via a bracket, and the bracket is tilted downward from the second slider toward the patch area. The nozzle is suspended away from the second lead screw guide via the bracket, so that when the second lead screw guide drives the nozzle to tilt downward via the second slider and the bracket, the nozzle can be moved to the patch area below the vision inspection device. Furthermore, when the second slider moves to any position on the second lead screw guide, the bottom height of the suction nozzle is always lower than the bottom height of the main shaft and higher than the effective acquisition distance of the vision detection device.

[0010] As a preferred embodiment of the present invention, the maximum stroke by which the first lead screw guide rail drives the connecting seat to move downward through the first slider and the connecting part is greater than the effective acquisition distance of the visual detection device. The maximum stroke by which the second lead screw guide rail drives the nozzle to move downward through the second slider and the bracket is less than the effective acquisition distance of the vision detection device.

[0011] As a preferred embodiment of the present invention, the patch area collected by the visual inspection device is the area in which the multiple suction nozzles are distributed around the central axis when the multiple hangers are in the highest position.

[0012] As a preferred embodiment of the present invention, the suction nozzle includes an air box, a straight tube is provided at the bottom of the air box, the upper end of the straight tube is connected to the air box, and a suction head is provided at the bottom of the straight tube, the suction head being configured to reciprocate along the axial direction of the straight tube. A spring is provided at the bottom of the air box. The spring is sleeved on the outside of the straight tube and its lower end is fixed to the suction head. The spring is compressed when the suction head moves upward.

[0013] As a preferred embodiment of the present invention, the lower end of the bracket is fixed to the upper end of the air box, and an adjustment motor is provided at the lower end of the bracket. The shaft of the adjustment motor passes through the holes on the bracket and the holes on the air box, extends into the air box, and is connected to the upper end of the straight pipe. The straight pipe is rotatably mounted on the air box, and the upper end of the straight pipe is located inside the air box and connected to the shaft of the adjusting motor through a hollow connector. Furthermore, when the shaft of the adjusting motor rotates, the straight tube rotates, and the suction head is configured to rotate synchronously with the suction head.

[0014] As a preferred embodiment of the present invention, an air pipe connector is provided on the side of the air box, the air pipe connector is inclined upward and connected to the hose, and the hose is bent above the second lead screw guide to form a curved section; As the suction nozzle is driven downward by the first lead screw guide rail and / or the second lead screw guide rail, the length of the bent section of the hose gradually shortens; As the suction nozzle is driven upward by the first lead screw guide rail and / or the second lead screw guide rail, the length of the bent section of the hose gradually increases.

[0015] As a preferred embodiment of the present invention, a fixed plate is provided on the main shaft, the hose portion is installed through a hole on the fixed plate, and the bent section of the hose is located between the second lead screw guide and the fixed plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention uses a vision inspection device surrounding a central axis to set up multiple nozzles and multiple connectors. Each nozzle is mounted on a sliding mechanism on the mounting slope of the corresponding connector. The nozzle is independently adjusted along the mounting slope by the sliding mechanism, and the connector and nozzle are moved axially along the central axis by a lifting drive device. This enables the execution end to actively adjust the placement based on visual positioning, which significantly improves the placement accuracy of components. Attached Figure Description

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the placement execution mechanism of the SMT placement machine provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the connecting seat portion of the placement execution mechanism of the SMT placement machine provided in an embodiment of the present invention; Figure 3 This is a schematic diagram showing the surrounding distribution of the connection seats of the placement execution mechanism of the SMT placement machine provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the nozzle movement direction of the placement execution mechanism of the SMT placement machine provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the nozzle part of the placement execution mechanism of the SMT placement machine provided in an embodiment of the present invention.

[0019] The labels in the diagram represent the following: 1-Main spindle; 2-Connecting seat; 3-Suction nozzle; 4-First lead screw guide rail; 5-Second lead screw guide rail; 6-Vision inspection device; 11-Guide groove; 12-Fixing plate; 21-Mounting slope; 22-Connecting part; 23-Strip-shaped protrusion; 31-Air box; 32-Straight tube; 33-Suction head; 34-Spring; 35-Air pipe connector; 36-Hose; 41-First slider; 51-Second slider; 52-Hanger; 53-Adjusting motor. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: like Figure 1-4 As shown, the present invention provides a placement execution mechanism for an SMT pick-and-place machine, comprising: The central axis 1 has a visual inspection device 6 at its bottom, which is used to obtain image data of the patch area.

[0022] The central shaft 1 of the present invention is used to install the XY axis mechanism in the SMT placement machine. The XY axis mechanism is mainly used to move the actuator horizontally along the X and Y axes, and the XY axis mechanism is equipped with a motor that can rotate the central shaft 1 to adjust the placement angle.

[0023] Furthermore, in order to achieve precise placement, the present invention differs from the existing method of pre-acquiring PCB images for placement in that: a vision inspection device 6 is set at the bottom of the central axis 1. After the XY axis mechanism moves the central axis 1 to the corresponding area, the vision inspection device 6 can collect information on the PCB board again to obtain image data of the placement area, thereby obtaining higher precision placement data.

[0024] To complete the multi-component mounting, it also includes nozzles 3, multiple of which are arranged around the central axis 1 and connected to an external air pressure control device through a hose 36.

[0025] The nozzle 3 is the core component for adsorbing and placing components. It is connected to an external air pressure control device through the hose 36. Adsorption is performed when negative pressure is generated, or placement is performed when negative pressure is eliminated / a slight positive pressure is generated.

[0026] Conventional image-based precise placement methods typically involve adjusting the position of the nozzle 3 by moving the central axis 1 of an XY-axis mechanism. However, the XY-axis mechanism is a large-stroke, high-load moving component that needs to move quickly to the PCB area for placement, resulting in relatively low accuracy. Therefore, to further improve placement accuracy and speed, this invention differs from conventional placement execution mechanisms that rely on frequent movement and positioning of the XY-axis mechanism in the following ways: Multiple connecting seats 2 are arranged around the outside of the central axis 1, and the connecting seats 2 are configured to be able to move along the axial direction of the central axis 1. The connecting seat 2 has a mounting slope 21, which slopes downward from the outside of the central axis 1 toward the center of the patch area. Each nozzle 3 is correspondingly arranged on the mounting slope 21 of a connecting seat 2 through a sliding mechanism, so that the nozzle 3 can slide along the mounting slope 21. The lifting drive device is independently connected to each connecting seat 2. Multiple lifting drive devices are arranged around the outside of the central shaft 1, and can independently drive each connecting seat 2 to move along the axial direction of the central shaft 1.

[0027] In this invention, multiple connecting seats 2 are arranged around the central shaft 1, and the suction nozzle 3 is fixed by a sliding mechanism mounted on the mounting inclined surface 21 of the connecting seat 2. Each connecting seat 2 is driven by an independent lifting drive device to move axially along the central shaft 1, thereby realizing the up-and-down movement of the suction nozzle 3, that is, realizing the adsorption and placement of the suction nozzle 3. In addition, the suction nozzle 3 is controlled by the sliding mechanism on the mounting inclined surface 21, so that the horizontal position of each suction nozzle 3 can be independently adjusted.

[0028] Therefore, the mounting actuator of the present invention is provided with a sliding mechanism and a lifting drive device on the side of the central shaft 1, which can actively drive the nozzle 3 to move horizontally and vertically. It has the characteristics of small stroke and low load, and can achieve high-precision and fast mounting.

[0029] In addition, the nozzle 3 can move along the direction of the mounting slope 21 through the sliding mechanism, so that the nozzle 3 can achieve full coverage of the visual inspection device 6, and there is no need to move and adjust the area located below the central axis 1 through the XY axis mechanism.

[0030] When the image data acquired by the vision inspection device 6 determines the horizontal position of the mounting, the nozzle 3 is moved to the corresponding horizontal position by the sliding mechanism, and the lifting drive device drives the connecting seat 2 to move downward along the central axis 1 to move the nozzle 3 downward for mounting.

[0031] Specifically: During operation, the XY-axis mechanism of the SMT pick-and-place machine moves the placement execution mechanism above the feeder. The vision inspection device 6 is activated and acquires image information of each component on the feeder. Each nozzle 3, adjusted by its respective sliding mechanism, moves to a suitable horizontal position and, in coordination with the lifting drive device, moves downward to pick up different electronic components. After picking up the components, the XY-axis mechanism moves the placement execution mechanism above the PCB board to be placed.

[0032] Next, the vision inspection device 6 at the bottom of the central axis 1 is activated again to acquire images of the target mounting position on the PCB board, obtain accurate image data, and calculate the horizontal coordinates (X, Y position) of the mounting point.

[0033] Then, the SMT placement machine's control system calculates the sliding mechanism action and lifting drive action corresponding to each nozzle 3 based on the target horizontal position of each component determined by the vision inspection device 6.

[0034] During placement, the control system controls one of the sliding mechanisms to drive the nozzle 3 to slide along the mounting ramp 21 of the connector 2, thereby adjusting the nozzle 3 and the picked-up component to above the target horizontal position. Then, the control system controls the lifting drive to drive the connector 2 downward, placing the component picked up by the nozzle 3 into the target position. After placement, the control system controls the sliding mechanism and lifting drive to reset the nozzle 3, and then drives the next nozzle 3 according to the same logic for placement, until all the components picked up by the nozzles are placed in the target position, completing one placement cycle.

[0035] Since the multiple suction nozzles 3 are installed in an alternating manner, the movement of the multiple suction nozzles 3 around the central axis 1 does not affect each other. Of course, it is preferable to have four suction nozzles 3, and the four suction nozzles 3 are installed in a way that is perpendicular to the X-axis and Y-axis to facilitate position calculation and adjustment.

[0036] Example 2: like Figure 1 , Figure 2 As shown, based on Embodiment 1, the lifting drive device includes a first lead screw guide rail 4, which is driven by a motor located outside the central shaft 1. The connecting seat 2 has a connecting part 22, which is connected to the first slider 41 of the first lead screw guide 4. The first lead screw guide 4 drives the connecting seat 2 to move axially along the central axis 1 through the first slider 41 and the connecting part 22.

[0037] In this embodiment, a first lead screw guide 4 is provided on the peripheral wall of the main shaft 1. The first lead screw guide 4 drives the connecting seat 2 to move axially along the main shaft 1 through the first slider 41 and the connecting part 22, thereby realizing the up-and-down movement of the connecting seat 2. Moreover, since the length of the first lead screw guide 4 is shorter than that of the XY axis mechanism, it can achieve higher precision than the XY axis mechanism, thus enabling high-precision adjustment of the suction nozzle 3.

[0038] In a preferred embodiment, such as Figure 3 As shown, multiple guide grooves 11 are radially inwardly provided on the outer side of the main shaft 1. The multiple guide grooves 11 are equidistantly distributed around the peripheral wall of the main shaft 1, and each guide groove 11 penetrates the bottom of the central shaft 1. The connecting seat 2 protrudes outward on the side facing the central shaft 1 to form a strip-shaped protrusion 23. The strip-shaped protrusion 23 is arranged parallel to the axis of the central shaft 1 and is inserted into the corresponding guide groove 11. The strip-shaped protrusion 23 is configured to be able to slide along the axial direction of the central shaft 1 in the guide groove 11.

[0039] The cooperation between the guide groove 11 and the strip-shaped protrusion 23 restricts the connector 2 to slide only along the axial direction (i.e., vertical direction) of the central axis 1, ensuring motion stability and preventing circumferential rotation or radial offset of the connector 2, thereby improving mounting accuracy.

[0040] Example 3: Based on Example 1, such as Figure 1 , Figure 2 , Figure 4 As shown, the slide rail mechanism includes a second lead screw guide rail 5, which is driven by a motor mounted on the connecting seat 2, and the second lead screw guide rail 5 is mounted on the mounting inclined surface 21 of the connecting seat 2. The second lead screw guide rail 5 has a second slider 51. The first slider 51 is connected to the nozzle 3 through the bracket 52. The bracket 52 is tilted downward from the second slider 51 toward the patch area. The nozzle 3 is suspended away from the second lead screw guide rail 5 through the bracket 52. When the second lead screw guide rail 5 drives the nozzle 3 to tilt downward through the second slider 51 and the bracket 52, the nozzle 3 can be moved to the patch area below the vision inspection device 6. Furthermore, when the second slider 51 moves to any position of the second lead screw guide rail 5, the bottom height of the suction nozzle 3 is lower than the bottom height of the main shaft 1 and higher than the effective acquisition distance of the vision inspection device 6.

[0041] In this embodiment, the second lead screw guide rail 5 is driven by an independent motor (mounted on the connecting seat 2). A downwardly extending bracket 52 is fixed on the second slider 51 of the second lead screw guide rail 5, and the suction nozzle 3 is mounted on the bottom end of the bracket 52. Therefore, the second lead screw guide rail 5 can drive the second slider 51, together with the bracket 52 and the suction nozzle 3, to slide along the inclined direction of the mounting slope 21. This design makes the movement trajectory of the suction nozzle 3 inclined downward, so when it slides from a high position to a low position, the suction nozzle 3 can be moved below the central axis 1 to ensure that it can cover the patch area collected by the vision inspection device 6 without adjustment through the XY axis mechanism.

[0042] Furthermore, based on Embodiments 2 and 3, the maximum stroke of the first lead screw guide rail 4 driving the connecting seat 2 to move downward through the first slider 41 and the connecting part 22 is greater than the effective acquisition distance of the visual inspection device 6, and the maximum stroke of the second lead screw guide rail 5 driving the suction nozzle 3 to move downward through the second slider 51 and the hanger 52 is less than the effective acquisition distance of the visual inspection device 6.

[0043] The maximum downward stroke of the first lead screw guide 4 driving the connecting seat 2 should be greater than the effective acquisition distance of the lens of the vision inspection device 6 (i.e., the distance from the bottom of the lens to the optimal focusing plane) to ensure that even when the nozzle 3 is at its highest position, it can still be driven to move downward to complete the placement. Meanwhile, the vertical component of the downward movement of the nozzle 3 along the inclined plane driven by the second lead screw guide 5 (i.e., the vertical projection of its maximum stroke) should be less than the effective acquisition distance of the lens of the vision inspection device 6 (i.e., the distance from the bottom of the lens to the optimal focusing plane) to ensure that even when the nozzle 3 is at its lowest position, it still maintains a certain distance from the PCB board, thereby avoiding accidental contact.

[0044] In a preferred embodiment, such as Figure 1 As shown, the patch area collected by the visual inspection device 6 is the area where multiple hangers 52 are in the highest position and multiple nozzles 3 are distributed around the central axis 1.

[0045] The field of view of the vision inspection device 6 is set to cover the area surrounding all the nozzles 3 when the hangers 52 of all the nozzles 3 are at the highest end of their second lead screw guides 5 (i.e., the nozzles 3 are in the outermost and highest initial reset position), so as to ensure that the camera of the vision inspection device 6 can see the entire mounting area without obstruction before the mounting position is calculated and adjusted.

[0046] Example 4: Based on Example 1, such as Figure 4 As shown, the suction nozzle 3 includes an air box 31, a straight tube 32 is provided at the bottom of the air box 31, the upper end of the straight tube 32 is connected to the air box 31, and a suction head 33 is provided at the bottom of the straight tube 32. The suction head 33 is configured to be able to reciprocate along the axial direction of the straight tube 32. A spring 34 is provided at the bottom of the air box 31. The spring 34 is sleeved on the outside of the straight tube 32 and its lower end is fixed on the suction head 33. When the suction head 33 moves upward, the spring 34 is compressed.

[0047] In this embodiment, the air box 31 is used to connect to an external pipeline to provide air pressure control. The bottom of the air box 31 is connected to the suction head 33 via a straight tube 32, and the suction head 33 is suspended by a spring 34, which provides a certain buffering capacity when the suction head 33 contacts the components. The suction head 33 and the straight tube 32 are sealed and slidably connected to prevent air leakage at the connection between the suction head 33 and the straight tube 32 from affecting the adsorption effect during operation.

[0048] When the nozzle 3 picks up components, some components may slip during the pick-up process, resulting in a non-aligned state. That is, the edges of rectangular components intersect with the XY axes, which can easily cause the components to deviate from the solder paste printing position when placed, thus affecting the reflow soldering effect. Based on this, the following preferred embodiment is provided.

[0049] Example 5: Based on Example 4, such as Figure 5 As shown, the lower end of the bracket 52 is fixed to the upper end of the air box 31. An adjustment motor 53 is provided at the lower end of the bracket 52. The shaft of the adjustment motor 53 passes through the holes on the bracket 52 and the holes on the air box 31 and extends into the air box 31, and is connected to the upper end of the straight pipe 32. The straight pipe 32 is rotatably mounted on the air box 31, and the upper end of the straight pipe 32 is located inside the air box 31 and connected to the shaft of the adjusting motor 53 through a hollow connector. Furthermore, when adjusting the rotation of the shaft of the motor 53, the straight tube 32 rotates, and the suction head 33 is set to rotate synchronously with the suction head 33.

[0050] In this embodiment, by installing an adjustment motor 53 on the hanger 52, the shaft of the adjustment motor 53 can be connected to the end of the straight tube 32 inside the air box 31. The adjustment motor 53 can drive the straight tube 32 to rotate, that is, drive the suction head 33 to rotate, thereby realizing the horizontal angle adjustment of the adsorption components.

[0051] In order to enable the suction head 33 to be rotated by the straight tube 32, the straight tube 32 and the suction head 33 are connected by a keyway and form a sealed sliding assembly, while the spring 34 is connected to the suction head 33 by a rotational connection.

[0052] The hollow connector is mainly to ensure that the connection between the machine shaft and the straight tube 32 does not affect the air pressure adjustment at the suction head 33.

[0053] The air box 31 is supplied with air pressure control through an external pipeline. Since the air box 31 can be moved up and down by the first lead screw guide rail 4 and tilted up and down by the second lead screw guide rail 5, the external pipeline needs to be able to adapt to changes in the position of the air box 31. Based on this, the following preferred embodiment is provided.

[0054] Example 6: Based on Example 5, such as Figure 1 , Figure 4 , Figure 5 As shown, an air pipe connector 35 is provided on the side of the air box 31. The air pipe connector 35 is inclined upward and connected to the hose 36. The hose 36 is bent above the second lead screw guide rail 5 to form a curved section. As the suction nozzle 3 is driven downward by the first lead screw guide rail 4 and / or the second lead screw guide rail 5, the length of the bent section of the hose 36 gradually shortens. As the suction nozzle 3 is driven upward by the first lead screw guide rail 4 and / or the second lead screw guide rail 5, the length of the bent section of the hose 36 gradually increases.

[0055] In this embodiment, an upwardly inclined air pipe connector 35 is provided on the air box 31. The air pressure is adjusted by connecting the air pipe connector 35 with a hose 36. The hose 36 is bent above the second lead screw guide rail 5 to form a curved section, thereby leaving enough length for the nozzle 3 to move.

[0056] Furthermore, such as Figure 2 As shown, a fixed plate 12 is provided on the main shaft 1, and the hose 36 is installed by passing through the hole on the fixed plate 12, and the bent section of the hose 36 is located between the second lead screw guide 5 and the fixed plate 12.

[0057] The hose 36 is fixed by the fixed plate 12, so that a longer bending section is reserved between the fixed plate 12 and the second lead screw guide 5, thereby accommodating the movement of the nozzle 3 and the connecting seat 2.

[0058] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A placement actuator for an SMT pick-and-place machine, characterized in that, include: A central axis (1) is provided at its bottom with a visual inspection device (6), which is used to obtain image data of the patch area; Multiple suction nozzles (3) are arranged around the central axis (1) and connected to an external air pressure control device through a hose (36); A connector (2) is provided around the outside of the central axis (1), and the connector (2) is configured to be able to move along the axial direction of the central axis (1). The connector (2) has a mounting slope (21) that slopes downward from the outside of the central axis (1) toward the center of the patch area. Each nozzle (3) is correspondingly disposed on the mounting slope (21) of a connector (2) through a sliding mechanism, so that the nozzle (3) can slide along the mounting slope (21). A lifting drive device, each of the connecting seats (2) is independently connected to a lifting drive device, and a plurality of the lifting drive devices are arranged around the outside of the central shaft (1) so as to be able to independently drive each of the connecting seats (2) to move along the axial direction of the central shaft (1); When the image data acquired by the visual inspection device (6) determines the horizontal position of the mounting, the nozzle (3) is moved to the corresponding horizontal position by the sliding mechanism, and the lifting drive device drives the connecting seat (2) to move downward along the central axis (1) to move the nozzle (3) downward for mounting.

2. The placement execution mechanism of an SMT pick-and-place machine according to claim 1, characterized in that, The lifting drive device includes a first lead screw guide rail (4), which is driven by a motor located outside the central shaft (1). The connecting seat (2) has a connecting part (22), which is connected to the first slider (41) of the first lead screw guide (4). The first lead screw guide (4) drives the connecting seat (2) to move axially along the central axis (1) through the first slider (41) and the connecting part (22).

3. The placement execution mechanism of an SMT pick-and-place machine according to claim 2, characterized in that, Multiple guide grooves (11) are radially inwardly provided on the outer side of the main shaft (1). The multiple guide grooves (11) are equidistantly distributed around the peripheral wall of the main shaft (1), and each guide groove (11) penetrates the bottom of the central shaft (1). The connecting seat (2) protrudes outward on one side of the central axis (1) to form a strip-shaped protrusion (23). The strip-shaped protrusion (23) is arranged parallel to the axis of the central axis (1) and is inserted into the corresponding guide groove (11). The strip-shaped protrusion (23) is configured to slide along the axial direction of the central axis (1) in the guide groove (11).

4. The placement execution mechanism of an SMT pick-and-place machine according to claim 3, characterized in that, The slide rail mechanism includes a second lead screw guide rail (5), which is driven by a motor mounted on the connecting seat (2), and the second lead screw guide rail (5) is mounted on the mounting inclined surface (21) of the connecting seat (2); The second lead screw guide (5) has a second slider (51), the first slider (51) is connected to the nozzle (3) through a bracket (52), and the bracket (52) is inclined downward from the second slider (51) toward the patch area. The nozzle (3) is suspended away from the second lead screw guide (5) through the bracket (52) so that when the second lead screw guide (5) drives the nozzle (3) to tilt downward through the second slider (51) and the bracket (52), the nozzle (3) can be moved to the patch area below the vision inspection device (6). Furthermore, when the second slider (51) moves to any position of the second lead screw guide (5), the bottom height of the suction nozzle (3) is lower than the bottom height of the main shaft (1) and higher than the effective acquisition distance of the vision detection device (6).

5. The placement execution mechanism of an SMT pick-and-place machine according to claim 4, characterized in that, The maximum stroke by which the first lead screw guide rail (4) drives the connecting seat (2) to move downward through the first slider (41) and the connecting part (22) is greater than the effective acquisition distance of the visual detection device (6); The maximum stroke of the second lead screw guide (5) driving the suction nozzle (3) to move downward through the second slider (51) and the bracket (52) is less than the effective acquisition distance of the visual detection device (6).

6. The placement execution mechanism of an SMT pick-and-place machine according to any one of claims 1-5, characterized in that, The patch area collected by the visual inspection device (6) is the area where multiple hangers (52) are located at their highest position and multiple suction nozzles (3) are distributed around the central axis (1).

7. The placement execution mechanism of an SMT pick-and-place machine according to claim 5, characterized in that, The suction nozzle (3) includes an air box (31), a straight tube (32) is provided at the bottom of the air box (31), the upper end of the straight tube (32) is connected to the air box (31), and a suction head (33) is provided at the bottom of the straight tube (32). The suction head (33) is configured to be able to reciprocate along the axial direction of the straight tube (32). A spring (34) is provided at the bottom of the air box (31). The spring (34) is sleeved on the outside of the straight tube (32) and its lower end is fixed on the suction head (33). When the suction head (33) moves upward, the spring (34) is compressed.

8. The placement execution mechanism of an SMT pick-and-place machine according to claim 7, characterized in that, The lower end of the bracket (52) is fixed to the upper end of the air box (31). An adjustment motor (53) is provided at the lower end of the bracket (52). The shaft of the adjustment motor (53) passes through the holes on the bracket (52) and the holes on the air box (31) and extends into the air box (31), and is connected to the upper end of the straight pipe (32). The straight pipe (32) is rotatably mounted on the air box (31), and the upper end of the straight pipe (32) is located inside the air box (31) and connected to the shaft of the adjusting motor (53) through a hollow connector; Furthermore, when the shaft of the adjusting motor (53) rotates, the straight tube (32) rotates, and the suction head (33) is configured to rotate synchronously with the suction head (33).

9. The placement execution mechanism of an SMT pick-and-place machine according to claim 8, characterized in that, An air pipe connector (35) is provided on the side of the air box (31). The air pipe connector (35) is inclined upward and connected to the hose (36). The hose (36) is bent above the second lead screw guide (5) to form a curved section. As the suction nozzle (3) is driven downward by the first lead screw guide (4) and / or the second lead screw guide (5), the length of the bent section of the hose (36) gradually shortens; As the suction nozzle (3) is driven upward by the first lead screw guide (4) and / or the second lead screw guide (5), the length of the curved section of the hose (36) gradually increases.

10. The placement execution mechanism of an SMT pick-and-place machine according to claim 9, characterized in that, A fixed plate (12) is provided on the main shaft (1), and the hose (36) is installed through the hole on the fixed plate (12), and the bent section of the hose (36) is located between the second lead screw guide (5) and the fixed plate (12).

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