Chip mounter suction nozzle assembly with anti-deviation mechanism

Abstract

This utility model relates to the technical field of nozzle assembly devices, and in particular to a pick-and-place machine nozzle assembly with an anti-offset mechanism. It includes a pick-and-place machine frame and multiple sets of nozzle structures disposed on its outer wall. Each nozzle structure includes a drive arm slidably connected to the outer wall of the pick-and-place machine frame. This utility model uses two sets of positioning plates symmetrically arranged inside multiple sets of annular suction heads. A micro-motor enables the two sets of positioning plates to slide away from each other. The flat working surfaces of the positioning plates support the inner walls of the center holes of the components being placed. During the sliding process, the positioning plates push the components through rigid contact until the inner walls of the center holes of the components are completely in contact with the two sets of positioning plates. At this point, the center of the components coincides with the reference point. This allows for rapid center self-calibration of components placed in the center holes, enabling accurate positioning and pickup of the components, preventing offset after suction and fixing, and improving the quality of subsequent placement.

Description

Technical Field

[0001] This utility model relates to the technical field of nozzle assembly devices, and in particular to a pick-and-place machine nozzle assembly with an anti-offset mechanism. Background Technology

[0002] The pick-and-place nozzle assembly is one of the core components of a pick-and-place machine. It is mainly used to accurately pick up, transport, and place surface mount components (such as resistors, capacitors, chips, etc.) to designated positions on the circuit board. It is a key actuator for realizing the automated pick-and-place process, and its structure and performance directly affect the placement accuracy, speed, and stability.

[0003] To facilitate the loading of surface mount components, a conveyor belt is typically used. After being transported to the designated location, the components are then held in place by the nozzles of the pick-and-place machine. However, existing pick-and-place machine nozzle assemblies often rely on simple adsorption for fixation. In this case, the nozzles directly adsorb the components using negative pressure. If the components are shifted due to conveyor belt vibration during loading, their initial positions may deviate, affecting the nozzle structure's ability to hold them in place. This results in inaccurate placement of the components, reducing placement quality. Furthermore, the components cannot be properly positioned before adsorption and fixation; they can only be held in place by the friction between the nozzle and the component, making accurate pickup difficult and further reducing the overall quality of the final PCB placement. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a pick-and-place machine nozzle assembly with an anti-offset mechanism. This solves the technical problem that the initial position of mounted components may deviate, ultimately leading to inaccurate component placement and offset, hindering accurate component pickup and reducing the quality of subsequent circuit board mounting. The new assembly achieves rapid center self-calibration for components mounted in center holes, enabling accurate positioning and pickup of components, preventing offset after adsorption and fixation, and improving the quality of subsequent mounting.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a pick-and-place machine nozzle assembly with an anti-offset mechanism, comprising a pick-and-place machine mechanical frame and multiple sets of nozzle structures disposed on its outer wall. The nozzle structure includes a drive arm slidably connected to the outer wall of the pick-and-place machine mechanical frame and a mounting base located at the bottom of the drive arm. An air pipe is fixedly installed between the mounting base and the drive arm. Multiple sets of air pipes are equidistantly distributed in a ring along the top of the mounting base, and the bottom end of the air pipe passes through the interior of the mounting base and is connected to an adsorption head. The bottom of the mounting base is provided with an anti-offset component, which includes a first positioning plate and a second positioning plate symmetrically arranged on both sides of the center of the mounting base. The first positioning plate and the second positioning plate, which are far apart from each other, position the mounting component directly below the mounting base. The inner center of the mounting base is rotatably connected to a drive gear that drives the first positioning plate and the second positioning plate to slide synchronously. The drive gear has a transmission rack on both sides that is connected to the first positioning plate and the second positioning plate.

[0006] Preferably, the bottom end faces of the first positioning plate and the second positioning plate are slightly lower than the bottom end faces of the multiple sets of suction heads.

[0007] Preferably, a micro motor that drives the drive gear to rotate is fixedly installed on the top of the mounting base, and connecting plates that are fixedly installed on the outer walls of the two sets of transmission racks are fixedly installed with the top ends of the first positioning plate and the second positioning plate.

[0008] Preferably, the two sets of transmission racks slide away from each other, driving the first positioning plate and the second positioning plate to be supported on both sides of the inner wall of the center hole of the mounted component.

[0009] Preferably, both sides of the outer walls of the two sets of transmission racks are fixedly equipped with limiting plates to limit the movement position of the transmission racks.

[0010] Preferably, a height compensation component is provided between the adsorption head and the trachea. The height compensation component includes a compression spring that is fixedly installed at the bottom of the mounting base and sleeved on the outer peripheral wall of multiple sets of tracheas. A fixing plate that is slidably connected to the trachea is fixedly installed at the bottom of the compression spring.

[0011] Preferably, the bottom of the fixing plate is fixedly installed with an installation cylinder forming a negative pressure cavity in the middle, and the adsorption head is detachably sleeved on the outer peripheral wall of the installation cylinder.

[0012] By employing the above technical solution, this utility model provides a pick-and-place machine nozzle assembly with an anti-offset mechanism, which has at least the following beneficial effects: 1. This utility model uses two sets of positioning plates symmetrically arranged inside multiple sets of annular adsorption heads. A micro motor enables the two sets of positioning plates to slide away from each other. The flat working surface of the positioning plates supports the inner wall of the center hole of the component. No matter how much deviation there is between the center of the component and the reference point directly below the bottom of the mounting base when it is initially placed, the positioning plates will push the component through rigid contact during the sliding process until the inner wall of the center hole of the component is completely attached to the two sets of positioning plates. At this time, the center of the component coincides with the reference point. For components with center holes, the center can be quickly self-calibrated, and the component can be accurately positioned and picked up. This prevents the component from shifting after adsorption and fixation, and improves the quality of subsequent placement.

[0013] 2. This utility model utilizes the cooperation between multiple sets of suction heads and two sets of internal support positioning plates. After the positioning plates complete the internal support positioning, they remain stable. At this time, multiple sets of annular suction heads simultaneously start negative pressure suction. Since the mounted components have been accurately positioned directly below the bottom of the mounting base, the suction heads can accurately act on the preset suction area of ​​the mounted components, avoiding the contact position between the suction heads and the mounted components deviating from the preset point due to the offset of the mounted components. This prevents the mounted components from being subjected to uneven force during suction, thus preventing secondary offset. Attached Figure Description

[0014] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0015] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram showing the installation position of the suction nozzle structure and anti-displacement component of this utility model; Figure 3 This is an internal sectional view of the mounting base of this utility model; Figure 4 This is a schematic diagram of the closing structure of the two sets of positioning plates of this utility model; Figure 5 This is an exploded view of the two sets of positioning plates of this utility model; Figure 6 This is a schematic diagram showing the installation position of the adsorption head and the air tube of this utility model.

[0016] In the diagram: 1. Pick and place machine frame; 2. Nozzle structure; 21. Drive arm; 22. Mounting base; 23. Air tube; 24. Adsorption head; 241. Mounting cylinder; 3. Anti-deviation component; 31. First positioning plate; 32. Second positioning plate; 4. Drive gear; 5. Transmission rack; 51. Limiting plate; 6. Connecting plate; 7. Micro motor; 8. Height compensation component; 81. Compression spring; 82. Fixing plate. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1 Addressing the issue that current component placement processes may experience initial positional deviations, leading to inaccurate component placement and offsets, hindering accurate component pickup and reducing the quality of subsequent PCB placement, this embodiment provides a pick-and-place machine nozzle assembly with an anti-offset mechanism. This assembly enables rapid center self-calibration for components with center holes, ensuring accurate component positioning and pickup, preventing offset after suction and fixation, and ultimately improving the quality of subsequent placement. Please refer to... Figure 1 - Figure 5 The pick-and-place machine nozzle assembly with anti-offset mechanism includes a pick-and-place machine frame 1 and multiple nozzle structures 2 disposed on its outer wall. The nozzle structure 2 includes a drive arm 21 slidably connected to the outer wall of the pick-and-place machine frame 1 and a mounting base 22 located at the bottom of the drive arm 21. An air tube 23 is fixedly installed between the mounting base 22 and the drive arm 21. The top ends of the multiple air tubes 23 are connected to a set of air pump tubes inside the drive arm 21, and the air pump tubes are connected to the air pump, which generates negative pressure inside the multiple air tubes 23 to adsorb and fix the components to be placed. The multiple air tubes 23 are distributed equidistantly in a ring along the top of the mounting base 22, and the bottom ends of the air tubes 23 pass through the interior of the mounting base 22 and are connected to an adsorption head 24. The multiple nozzle structures 2 can adsorb and fix multiple components to be placed, and with the cooperation of the pick-and-place machine frame 1, can simultaneously drive multiple components to be placed accurately on the top of the chip, realizing the placement of components.

[0019] During the conveyor belt loading process, the components are prone to shifting due to belt vibration. This can cause initial positional deviations, affecting the suction position of the nozzle structure 2 and leading to inaccurate component placement. This reduces placement quality. To address this deviation issue, such as... Figure 2 - Figure 5As shown, by setting an anti-offset component 3, the bottom of the mounting base 22 is provided with an anti-offset component 3. The anti-offset component 3 includes a first positioning plate 31 and a second positioning plate 32 symmetrically arranged on both sides of the center of the mounting base 22. The first positioning plate 31 and the second positioning plate 32, which are far apart from each other, position the mounting components directly below the mounting base 22. The inner center of the mounting base 22 is rotatably connected to a drive gear 4 that drives the first positioning plate 31 and the second positioning plate 32 to slide synchronously. The drive gear 4 has a transmission rack 5 on both sides that is connected to the first positioning plate 31 and the second positioning plate 32. The pick-and-place machine frame 1 is initially located at the top of the conveyor belt. When a set of mounting components is transported to the bottom of the pick-and-place machine frame 1, a set of suction nozzles 2 first positions and adsorbs the mounting components. After adsorbing four sets of mounting components, the pick-and-place machine frame 1 moves the mounting components to the mounting position, thereby accurately adsorbing and fixing multiple sets of mounting components on the top of the mounting surface. The positions of the multiple sets of suction nozzles 2 correspond to the mounting positions of the mounting components.

[0020] The surfaces of the two sets of positioning plates are made of soft material to avoid wear on the inner walls of the mounted components during the internal support process. The bottom end faces of the first positioning plate 31 and the second positioning plate 32 are slightly lower than the bottom end faces of the multiple sets of suction heads 24. Before positioning and suctioning the mounted components, the two sets of positioning plates are in a close-fitting state. Then, the drive arm 21 moves the multiple sets of suction heads 24 and the two sets of positioning plates downward. First, the two sets of positioning plates are inserted into the center hole of the mounted components, and the bottom end of the positioning plate abuts against the support surface of the mounted components. At this time, the bottom end of the multiple sets of suction heads 24 is attached to the top of the mounted components. After the two sets of positioning plates correct the position of the mounted components, the multiple sets of suction heads 24 apply negative pressure suction to the mounted components.

[0021] To ensure accurate positioning of the components directly beneath the mounting base 22, a drive gear 4 is connected to two sets of positioning plates via a transmission mechanism of two sets of racks 5. This allows the two sets of positioning plates to slide synchronously away from or towards each other. Figure 3 - Figure 5As shown, a micro motor 7 that drives the drive gear 4 is fixedly mounted on the top of the mounting base 22. Connecting plates 6, which are fixedly mounted to the tops of the first positioning plate 31 and the second positioning plate 32, are fixedly mounted on the outer walls of both sets of transmission racks 5. The two sets of transmission racks 5 slide away from each other, causing the first positioning plate 31 and the second positioning plate 32 to be supported on both sides of the inner wall of the center hole of the mounted component. The output end of the micro motor 7 is fixedly connected to the top of the drive gear 4, driving the drive gear 4 to rotate inside the mounting base 22, so that the two sets of transmission racks 5 and the two sets of connecting plates 6 are fixedly mounted on the outer walls of both sets of racks 5. Simultaneously, the mounting plate 6 drives the first positioning plate 31 and the second positioning plate 32 to slide away from each other (during this process, the two sets of positioning plates are inside the center hole of the component). No matter how much deviation there is between the center of the component and the reference point directly below the bottom of the mounting base 22 when the component is initially placed, the two sets of positioning plates will push the component through rigid contact during the sliding process until the inner wall of the center hole of the component is completely in contact with the two sets of positioning plates. At this time, the center of the component coincides with the reference point, realizing center self-calibration and preventing the component from shifting after placement.

[0022] Example 2 Based on Example 1, such as Figure 1 - Figure 5 As shown, the device is also equipped with a height compensation component 8, which is used to position components with slight height differences. At the same time, it can ensure that multiple sets of adsorption heads 24 are always attached to the top of the component. After positioning, the component is adsorbed and fixed. Limiting plates 51 are fixedly installed on both outer walls of the two sets of transmission racks 5 to limit the movement of the transmission racks 5. The limiting plates 51 can expand the two sets of positioning plates to the maximum width, which can adapt to different specifications of components and ensure that there is no interference damage during the positioning process.

[0023] To facilitate the positioning of slightly height-different surface-mount components by the two sets of positioning plates directly below the mounting base 22, and to ensure that the bottom ends of the multiple negative pressure heads adhere to the top of the surface-mount components for adsorption, the bottom ends of the two sets of positioning plates abut against the support surface supporting the surface-mount components. The height compensation component 8 then compensates for the height of the adsorption head 24, preventing the positioning plates from being inserted too shallowly into the center hole of the surface-mount component, which would otherwise hinder its movement. Figure 6As shown, a height compensation component 8 is provided between the adsorption head 24 and the air tube 23. The height compensation component 8 includes a compression spring 81 fixedly installed at the bottom of the mounting base 22 and sleeved on the outer peripheral wall of multiple sets of air tubes 23. A fixing plate 82 that is slidably connected to the air tube 23 is fixedly installed at the bottom of the compression spring 81. When positioning components with varying heights directly below the mounting base 22, two sets of adjacent positioning plates are inserted into the center hole of the component. During this process, the bottom of multiple suction heads 24 is limited to the top of the component. As the two sets of positioning plates continue to move downwards, the compression spring 81 is forced to deform, ensuring that the suction head 24 is always at the top of the component. Subsequently, with the cooperation of two sets of transmission racks 5 and drive gears 4, after the two sets of positioning plates complete the internal support positioning, the component remains stable. Simultaneously, multiple sets of air tubes 23 are activated to perform negative pressure suction on the component. It should be noted that the elastic force of the compression spring 81 is relatively small. The height of the component is determined by the bottom of the two sets of positioning plates abutting against the support surface of the component. Furthermore, during the positioning process of pushing the component, since the height difference is not significant, the clamping force of the compression spring 81 will not affect the positioning movement of the component.

[0024] The bottom of the fixed plate 82 is fixedly installed with an installation cylinder 241 that forms a negative pressure cavity in the middle. The suction head 24 is detachably sleeved on the outer peripheral wall of the installation cylinder 241. The suction head 24 and the installation cylinder 241 are detachably set by friction, which allows the easily worn suction head 24 to be replaced separately without replacing the entire suction nozzle structure, greatly reducing consumable costs and spare parts inventory.

[0025] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pick-and-place machine nozzle assembly with an anti-offset mechanism, comprising a pick-and-place machine mechanical frame (1) and multiple sets of nozzle structures (2) disposed on its outer wall, characterized in that: The suction nozzle structure (2) includes a drive arm (21) slidably connected to the outer wall of the pick-and-place machine frame (1), and a mounting base (22) located at the bottom of the drive arm (21). An air tube (23) is fixedly installed between the mounting base (22) and the drive arm (21). Multiple sets of air tubes (23) are distributed equidistantly in a ring along the top of the mounting base (22), and the bottom end of the air tube (23) passes through the interior of the mounting base (22) and is connected to an suction head (24). The bottom of the mounting base (22) is provided with an anti-offset component (3). The anti-offset component (3) includes a first positioning plate (31) and a second positioning plate (32) symmetrically arranged on both sides of the center of the mounting base (22). The first positioning plate (31) and the second positioning plate (32) which are far apart from each other position the mounting components directly below the mounting base (22). The inner center of the mounting base (22) is rotatably connected to a drive gear (4) that drives the first positioning plate (31) and the second positioning plate (32) to slide synchronously. The drive gear (4) has a transmission rack (5) on both sides that is connected to the first positioning plate (31) and the second positioning plate (32).

2. The pick-and-place machine nozzle assembly with anti-offset mechanism according to claim 1, characterized in that: The bottom end faces of the first positioning plate (31) and the second positioning plate (32) are slightly lower than the bottom end faces of the multiple sets of suction heads (24).

3. A pick-and-place machine nozzle assembly with an anti-offset mechanism according to claim 1, characterized in that: The top of the mounting base (22) is fixedly mounted with a micro motor (7) that drives the drive gear (4) to rotate, and the outer walls of the two sets of transmission racks (5) are fixedly mounted with connecting plates (6) that are fixedly mounted to the top of the first positioning plate (31) and the second positioning plate (32).

4. A pick-and-place machine nozzle assembly with an anti-offset mechanism according to claim 1, characterized in that: The two sets of transmission racks (5) slide away from each other, driving the first positioning plate (31) and the second positioning plate (32) to be supported on both sides of the inner wall of the center hole of the mounted component.

5. A pick-and-place machine nozzle assembly with an anti-offset mechanism according to claim 4, characterized in that: Both sides of the outer walls of the two sets of transmission racks (5) are fixedly equipped with limiting plates (51) to limit the movement position of the transmission racks (5).

6. A pick-and-place machine nozzle assembly with an anti-offset mechanism according to claim 1, characterized in that: A height compensation component (8) is provided between the adsorption head (24) and the air tube (23). The height compensation component (8) includes a compression spring (81) fixedly installed at the bottom of the mounting base (22) and sleeved on the outer peripheral wall of multiple sets of air tubes (23). A fixing plate (82) that is slidably connected to the air tube (23) is fixedly installed at the bottom of the compression spring (81).

7. A pick-and-place machine nozzle assembly with an anti-offset mechanism according to claim 6, characterized in that: The bottom of the fixed plate (82) is fixedly installed with an installation cylinder (241) forming a negative pressure cavity in the middle, and the adsorption head (24) is detachably sleeved on the outer peripheral wall of the installation cylinder (241).

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