An assembly head module for a high-precision desktop SMT placement machine

Abstract

The present application relates to an assembly head module of a high-precision desktop SMT placement machine, and relates to the technical field of placement machines, including: an assembly mechanism, which is detachably connected to the SMT placement machine body; a power mechanism, which is detachably connected to the assembly mechanism and can be adjusted translationally on the assembly mechanism; a placement mechanism, including a drive assembly and a nozzle assembly, the nozzle assembly is connected to the output end of the drive assembly and is driven to rotate by the drive assembly; and a connecting mechanism, which is connected to the power output end of the power mechanism and outputs power to the outside, one end is connected to the connecting mechanism, and the other end is connected to the drive assembly, and the end connected to the drive assembly is provided with a limit assembly for controlling the deflection range of the nozzle assembly. The present application adjusts the deflection accuracy of the nozzle rod by controlling the range of motion of the nozzle rod, so that the positioning of components and PCBs is more accurate and the quality of the finished product is higher.

Description

Technical Field

[0001] The present application relates to the technical field of chip mounters, and in particular to an assembly head module of a high-precision desktop SMT chip mounter. Background Art

[0002] Mounter: Also known as "mounting machine" or "surface mount system" (Surface Mount System). In the production line, it is configured after the dispensing machine or screen printer. It is a device that accurately places surface mount components on the PCB pads by moving the mounting head.

[0003] The SMT machine has Marks on important parts such as the mounting spindle, dynamic / static lens, nozzle holder, and feeder. Machine vision can automatically calculate the coordinates of the center system of these Marks, establish the conversion relationship between the coordinate system of the SMT machine and the coordinate system of the PCB and the mounted components, and calculate the precise coordinates of the movement of the SMT machine; the mounting head grabs the nozzle and absorbs the component at the corresponding position according to the imported mounting component package type, component number and other parameters; the static lens detects, identifies and centers the absorbed component according to the visual processing program; after the centering is completed, the mounting head mounts the component to the predetermined position on the PCB. This series of component identification, centering, detection and mounting actions are all automatically completed by the industrial computer after the command control system obtains the relevant data according to the corresponding instructions.

[0004] However, as the equipment is used for a long time, the parts on the assembly head will be worn, causing the rotation range of the patch mechanism or the nozzle rod to change, and the deflection accuracy of the nozzle rod to increase. When the components are adsorbed and mounted on the PCB, the alignment of the components and the PCB will deviate, exceeding the alignment range, affecting the installation accuracy and quality of the finished product. Summary of the invention

[0005] The purpose of this application is to provide an assembly head module for a high-precision desktop SMT placement machine, which adjusts the deflection accuracy of the nozzle rod by controlling the range of motion of the nozzle rod, so that the positioning of components and PCBs is more accurate and the quality of the finished product is higher.

[0006] The assembly head module of a high-precision desktop SMT placement machine provided in this application adopts the following technical solution:

[0007] An assembly head module of a high-precision desktop SMT placement machine, comprising:

[0008] Assembly mechanism, detachably connected to the SMT patch body;

[0009] The power mechanism is detachably connected to the assembly mechanism and can be adjusted in translation on the assembly mechanism;

[0010] The patch mechanism includes a driving component and a nozzle component, wherein the nozzle component is connected to the output end of the driving component and is driven to rotate by the driving component; and

[0011] The connecting mechanism is connected to the power output end of the power mechanism and outputs the power outward. One end is connected to the connecting mechanism and the other end is connected to the driving assembly. The end connected to the driving assembly is provided with a limit assembly for controlling the deflection range of the suction nozzle assembly.

[0012] By adopting the above technical solution, the patch mechanism is connected to the power mechanism through the connecting mechanism, and the power mechanism is connected to the assembly mechanism in translation. The assembly mechanism is installed on the SMT patch machine body. The height position of the patch mechanism can be adjusted by adjusting the height position of the power mechanism on the assembly mechanism. During the rotation of the nozzle assembly, the rotation accuracy will be reduced, causing the alignment of the component and the PCB to shift. The position of the limit assembly on the connecting mechanism is adjusted to limit the deflection angle and range of the nozzle assembly, so that the nozzle assembly is stopped when it deflects to the required angle, and the alignment accuracy of the component and the PCB is higher.

[0013] Optionally, the assembly mechanism includes a fixed seat body, a movable seat body and an adjustment component, the fixed seat body is provided with a movable groove extending through the left and right sides, the movable seat body is slidably arranged in the movable groove, both ends of the movable seat body are connected with limit plates that fit the left and right sides of the fixed seat body, and the adjustment component is connected between the fixed seat body and the movable seat body.

[0014] By adopting the above technical solution, the fixed seat body is used to be installed and connected with the SMT mounting body, the movable seat body is used to be connected with the power mechanism, the movable seat body can move up and down in the movable groove, the limit plate limits the moving direction of the movable seat body so that the movable seat body can only move in a straight line, and the adjustment component can adjust the relative position of the fixed seat body and the movable seat body.

[0015] Optionally, the adjustment assembly includes an upper push rod and a lower push rod; the upper push rod passes through the fixed seat body and the movable seat body from bottom to top in sequence, and the upper end abuts against the top wall of the movable groove, and the upper push rod is threadedly connected to the movable seat body; the lower push rod passes through the fixed seat body from bottom to top into the movable groove, and the upper end abuts against the bottom surface of the movable seat body, and the lower push rod is threadedly connected to the fixed seat body.

[0016] By adopting the above technical scheme, when adjusting the position of the movable seat body, the two lower push rods can be adjusted first. The lower push rods support the movable seat body from below, apply an upward thrust to the movable seat body, so that the movable seat body stays at a certain height position, and then the upper push rod is installed. The upper push rod gradually moves up and abuts against the top wall of the movable groove, and a downward thrust is applied to the movable seat body by using a threaded connection. The upper push rod and the lower push rod are used in combination to fix the movable seat body at a certain height, thereby realizing flexible adjustment of the height of the movable seat body.

[0017] Optionally, the power mechanism is detachably connected to the limit plate, and includes a mounting plate and a driving cylinder. The mounting plate and the limit plate are detachably connected, and a piston rod of the driving cylinder is downwardly connected to the mounting plate.

[0018] By adopting the above technical solution, the power mechanism can be moved up and down and adjusted together with the movable seat body, and the driving cylinder is used as the power for lifting and lowering, and the power output is stable.

[0019] Optionally, the driving assembly includes a driving motor and a motor mounting seat, the driving motor is detachably connected to the motor mounting seat, the motor mounting seat is connected to the connecting mechanism, and the nozzle assembly is connected to the output shaft of the driving motor.

[0020] By adopting the above technical solution, the motor mounting seat is connected to the connecting mechanism and can move up and down together with the power mechanism, and the suction nozzle assembly is driven to rotate by the driving motor.

[0021] Optionally, the suction nozzle assembly includes a suction nozzle rod and a suction nozzle, the suction nozzle rod is connected to an output shaft of the driving motor, and the suction nozzle is arranged at an end of the suction nozzle rod away from the driving motor.

[0022] By adopting the above technical solution, the suction nozzle is used to absorb the components to be installed, and the components are moved and transported to the PCB for installation. The suction nozzle rod is used to connect the suction nozzle to the output shaft of the driving motor, which is driven to rotate by the driving motor, and at the same time, the components are grabbed and installed on the PCB after adjusting the angle.

[0023] Optionally, the connecting mechanism includes a first mounting seat connected to the output end of the power mechanism, a second mounting seat connected to the motor mounting seat, and a connecting rod connected between the first mounting seat and the second mounting seat, and two connecting rods are provided, which are relatively arranged on both sides of the assembly mechanism.

[0024] By adopting the above technical solution, the first mounting seat is connected to the piston rod of the driving cylinder, the second mounting seat is connected to the motor mounting seat, and the connecting rods are arranged on both sides of the assembly mechanism, so that the power mechanism, the patch mechanism and the connecting mechanism surround the assembly mechanism in the middle, making the structure of the entire assembly head more reasonable and compact.

[0025] Optionally, the second mounting seat is configured as a circular sleeve coaxial with the suction nozzle rod, and at least two sliding grooves penetrating the inner and outer sides are circumferentially opened on the side wall of the second mounting seat. The limit assembly is slidably arranged in the sliding groove and can be fixed. A positioning baffle is fixed on the suction nozzle rod, and as the suction nozzle rod rotates, the positioning baffle can abut the limit assembly.

[0026] By adopting the above technical solution, the second mounting seat is set as a circular sleeve, and the limit assembly can rotate along the second mounting seat to adjust the position. During the deflection of the nozzle rod, the positioning block on the nozzle rod is used to contact the limit assembly and then be blocked by the limit assembly. The limit assembly is used to limit the deflection angle of the positioning block and the nozzle rod. The nozzle rod is corrected by adjusting the position of the limit assembly to improve the deflection accuracy of the nozzle rod.

[0027] Optionally, the limiting assembly includes a slider radially arranged along the second mounting seat and a positioning rod penetrating the slider along the radial direction of the second mounting seat, the positioning rod is threadedly connected to the slider, and the front end is used to abut against the positioning baffle.

[0028] By adopting the above technical solution, the slider can move along the sliding groove, and the positioning baffle abuts against the positioning rod. The deflection range of the nozzle rod can be roughly limited by moving the slider, and the deflection range of the nozzle rod can be accurately limited by axially adjusting the position of the positioning rod. The positioning rod extends forward, and the contact position between the positioning baffle and the positioning rod moves forward. The positioning rod is retracted backward, and the contact position between the positioning baffle and the positioning rod moves backward.

[0029] Optionally, a locking rod is vertically connected to the lower surface of the sliding block, a locking groove is opened on the bottom wall of the sliding groove, and the locking rod passes through the locking groove and is connected to a locking nut.

[0030] By adopting the above technical solution and using the locking nut to lock the locking rod, the slider can be fixed to prevent the slider from loosening and moving.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. During the rotation of the nozzle assembly, the rotation accuracy will be reduced, causing the alignment of the component and the PCB to shift. The position of the limit assembly on the connecting mechanism is adjusted to limit the deflection angle and range of the nozzle assembly. The nozzle assembly is stopped when it deflects to the required angle, and the alignment accuracy of the component and the PCB is higher.

[0033] 2. When adjusting the height position of the patch mechanism, the two lower push rods can be adjusted first. The lower push rods support the movable seat body from the bottom, apply an upward thrust to the movable seat body, so that the movable seat body stays at a certain height position, and then install the upper push rod. The upper push rod gradually moves up and abuts against the top wall of the movable groove. The threaded connection is used to apply a downward thrust to the movable seat body. The upper push rod and the lower push rod are used together to fix the movable seat body at a certain height, thereby realizing flexible adjustment of the height of the patch mechanism.

[0034] 3. The second mounting seat is set as a circular sleeve. The limit assembly can rotate along the second mounting seat to adjust the position. During the deflection of the nozzle rod, the positioning block on the nozzle rod is used to contact the limit assembly and then be blocked by the limit assembly. The limit assembly is used to limit the deflection angle of the positioning block and the nozzle rod. The nozzle rod is corrected by adjusting the position of the limit assembly to improve the deflection accuracy of the nozzle rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the assembly head of the embodiment of the present application;

[0036] Figure 2 It is a structural schematic diagram of the assembly mechanism in the embodiment of the present application;

[0037] Figure 3 It is a structural schematic diagram of the patch mechanism in the embodiment of the present application;

[0038] Figure 4 It is a structural schematic diagram of the connection mechanism in the embodiment of the present application;

[0039] Figure 5 It is a schematic diagram of the matching structure of the patch mechanism and the connection mechanism in the embodiment of the present application;

[0040] In the figure, 1. assembly mechanism; 11. fixed seat body; 12. movable seat body; 13. movable groove; 14. limit plate; 15. upper push rod; 16. lower push rod; 2. power mechanism; 21. mounting plate; 22. driving cylinder; 3. patch mechanism; 31. driving motor; 32. motor mounting seat; 33. nozzle rod; 34. nozzle; 35. positioning baffle; 4. connecting mechanism; 41. first mounting seat; 42. second mounting seat; 43. connecting rod; 44. sliding groove; 45. slider; 46. positioning rod; 47. locking rod; 48. locking groove. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1 -Attached Figure 5 , further details of this application are given.

[0042] This application proposes an assembly head module for a high-precision desktop SMT placement machine, referring to Figure 1The assembly head includes an assembly mechanism 1, a power mechanism 2, a patch mechanism 3 and a connection mechanism 4. The assembly mechanism 1 is used to be installed with the body of the SMT patch machine. The power mechanism 2 is used to drive the patch mechanism 3 and the connection mechanism 4 to move. The patch mechanism 3 is used to grab the electronic components and deflect the electronic components to install them on the PCB circuit board. The connection mechanism 4 is used to connect the patch mechanism 3 to the power mechanism 2. The power mechanism 2 and the patch mechanism 3 are arranged on the left and right sides of the assembly mechanism 1, and the connection mechanism 4 is sleeved on the periphery of the assembly mechanism 1. The power mechanism is detachably connected to the assembly mechanism 1. One end of the connection mechanism 4 is connected to the power mechanism 2, and the other end is connected to the patch mechanism 3.

[0043] The patch mechanism 3 includes a driving component and a nozzle component. The nozzle component is used to adsorb electronic components, and the driving component is used to drive the nozzle component to rotate. A limiting component is set on the connecting mechanism 4. The limiting component cooperates with the nozzle component to limit the deflection angle and accuracy of the nozzle component, so as to achieve the purpose of improving the installation accuracy of the finished product.

[0044] Reference Figure 2 The assembly mechanism 1 includes a fixed seat body 11, a movable seat body 12 and an adjustment component. The adjustment component is connected between the fixed seat body 11 and the movable seat body 12, and is used to adjust the relative position between the fixed seat body 11 and the movable seat body 12, and fix the movable seat body 12. The fixed seat body 11 is set as a rectangular block structure, and a movable groove 13 is opened on it to penetrate the left and right sides. In this embodiment, the cross section of the movable groove 13 is long and strip-shaped; the movable seat body 12 is also set as a rectangular block structure, the length of which is the same as the length of the movable groove 13, and the width is smaller than the opening width of the movable groove 13. The movable seat body 12 can be slidably set in the movable groove 13, and can move up and down in the movable groove 13 to adjust the height. The two ends of the movable seat body 12 are fixedly connected to the limit plates 14, and the two limit plates 14 are attached to the left and right sides of the fixed seat body 11 to limit the moving direction of the movable seat body 12 and prevent the movable seat body 12 from escaping from the movable groove 13.

[0045] The adjustment assembly includes an upper push rod 15 and two lower push rods 16. In this embodiment, the upper push rod 15 and the lower push rods 16 are both bolts. The upper push rod 15 penetrates upwardly from the bottom of the fixed seat body 11 into the movable groove 13 and passes through the movable seat body 12, and the upper end of the upper push rod 15 abuts on the top wall of the movable groove 13. The hole connecting the fixed seat body 11 and the upper push rod 15 is a light hole, and the hole connecting the movable seat body 12 and the upper push rod 15 is a threaded hole, so that the upper push rod 15 is threadedly connected with the movable seat body 12, and the movable seat body 12 can be driven to rise and fall by rotating the upper push rod 15; the lower push rod 16 penetrates upwardly from the bottom of the fixed seat body 11 into the movable groove 13, and the upper end abuts on the bottom surface of the movable seat body 12, and the hole connecting the fixed seat body 11 and the lower push rod 16 is a threaded hole, so that the lower push rod 16 is threadedly connected with the fixed seat body 11, and the lower push rod 16 can be rotated to support the movable seat body 12 from below to prevent the movable seat body 12 from falling, and the movable seat body 12 is fixed by the downward thrust of the upper push rod 15.

[0046] Reference Figure 2 The power mechanism 2 is connected to the limit plate 14 at one end of the movable seat body 12. The power mechanism 2 includes a mounting plate 21 and a driving cylinder 22. The mounting plate 21 is connected to the limit plate 14 by bolts (not shown in the figure). The driving cylinder 22 is fixedly connected to the mounting plate 21, and the piston rod is downward and parallel to the limit plate 14. The lifting and lowering of the movable seat body 12 drives the lifting and lowering of the driving cylinder 22.

[0047] Reference Figure 3 , the patch mechanism 3 includes a driving assembly located at the top and a nozzle assembly located at the bottom, and the nozzle assembly is connected to the output end of the driving assembly. The driving assembly includes a driving motor 31 and a motor mounting seat 32. The driving motor 31 adopts a servo motor, and a reducer is connected to the output shaft. The driving motor 31 is connected to the motor mounting seat 32 by bolts. In this embodiment, the motor mounting seat 32 is set as a metal plate. The output shaft of the reducer passes through the center of the motor mounting seat 32 and is connected with a coupling. The nozzle assembly is connected to the output shaft of the reducer through the coupling. The nozzle assembly includes a nozzle rod 33 and a nozzle 34. The nozzle 34 is sleeved on the front end of the nozzle rod 33 for adsorbing electronic components. The nozzle rod is connected to the output shaft of the reducer. A positioning baffle 35 is fixed on the nozzle rod 33. One end of the positioning baffle 35 is sleeved on the nozzle rod 33, and the other end extends radially. The positioning baffle 35 can swing with the rotation of the nozzle rod 33.

[0048] Reference Figure 4 The connecting mechanism 4 includes a first mounting seat 41, a second mounting seat 42, a connecting rod 43 and a limiting assembly. The connecting rod 43 is connected between the first mounting seat 41 and the second mounting seat 42, and the limiting assembly is installed on the second mounting seat 42.

[0049] The first mounting seat 41 is configured as a rectangular block structure, and two connecting rods 43 are arranged in parallel and opposite to each other, respectively connected to the two ends of the first mounting seat 41, and the connecting rods 43 and the first mounting seat 41 can be welded into an integral structure, or fixed by bolts. The second mounting seat 42 is configured as a circular sleeve, with openings at both ends, and the ends of the two connecting rods 43 are fixed to the outer wall of the second mounting seat 42, and the connecting rods 43 are welded and fixed to the second mounting seat 42. Two sliding grooves 44 are provided on the side wall of the second mounting seat 42 along the circumferential direction, and the sliding grooves 44 run through the inner and outer sides of the side wall of the second mounting seat 42. The limit assembly is arranged in the sliding groove 44, and can rotate around the central axis of the second mounting seat 42 in the sliding groove 44, and can also be fixed as needed.

[0050] The limit assembly includes a slider 45, a positioning rod 46 and a locking rod 47. In this embodiment, the slider 45 is configured as a rectangular block, and the upper and lower surfaces are respectively fitted on the upper and lower surfaces of the sliding groove 44. The axis of the slider 45 passes through the central axis of the second mounting seat 42. For this purpose, a protrusion (not shown in the figure) that abuts against the inner wall of the second mounting seat 42 is fixed on the upper or lower surface of the slider 45 to ensure that the slider 45 is always arranged along the radial direction of the second mounting seat 42. The positioning rod 46 is detachably connected to the slider 45, and a threaded hole is provided in the direction of the central axis of the slider 45. The positioning rod 46 is configured as a bolt and is threadedly connected to the slider 45. The front end of the positioning rod 46 extends into the inner cavity of the second mounting seat 42. As the positioning rod 46 rotates on the slider 45, the front end of the positioning rod 46 approaches or moves away from the central axis of the second mounting seat 42.

[0051] In order to fix the slider 45, a locking rod 47 is vertically connected to the lower surface of the slider 45, and a locking groove 48 is opened on the bottom wall of the sliding groove 44. The locking groove 48 passes through the second mounting seat 42 to the lower end surface of the second mounting seat 42. In this embodiment, the end of the locking rod 47 is provided with a thread and passes through the locking groove 48, and is connected to a locking nut. When fixing the slider 45, tighten the locking nut until it abuts against the lower surface of the second mounting seat 42.

[0052] Reference Figure 1 and 5The first mounting seat 41 is fixed to the lower end of the piston rod of the driving cylinder 22, and is driven by the driving cylinder 22 to move up and down. The two connecting rods 43 are respectively located on both sides of the fixed seat body 11. The second mounting seat 42 is fixed to the lower surface of the motor mounting seat 32, and the second mounting seat 42 is coaxially arranged with the nozzle rod 33. The setting height of the slider 45 corresponds to the setting height of the positioning baffle 35. The positioning baffle 35 will abut against the conical head at the front end of the positioning rod 46 during the swinging process. With the axial movement of the positioning rod 46, the position where the positioning baffle 35 contacts the front end of the positioning rod 46 will change, and the swing range of the positioning baffle 35 and the nozzle rod 33 will change, thereby adjusting the deflection accuracy of the nozzle rod 33.

[0053] When the deflection angle of the nozzle rod 33 and the nozzle 34 is too large, and the electronic component exceeds the installation angle, the slider 45 can be moved toward the direction of the positioning baffle 35 so that the positioning rod 46 can abut the positioning baffle 35, and then the slider 45 is fixed. At this time, an electronic component is adsorbed by the nozzle 34 and installed on the PCB circuit board, and the deflection angle of the electronic component is observed. If the electronic component exceeds the installation angle, the positioning rod 46 is rotated forward to move the contact point between the positioning rod 46 and the positioning baffle 35 forward to limit the deflection angle of the nozzle rod 33. If the electronic component cannot reach the installation angle, the positioning rod 46 is rotated backward to move the contact point between the positioning rod 46 and the positioning baffle 35 backward, and the deflection angle of the nozzle rod 33 is released to reach the installation angle of the electronic component.

[0054] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An assembly head module for a high-precision desktop SMT placement machine, characterized in that: include: The assembly mechanism (1) is detachably connected to an SMT patch machine body, and the assembly mechanism (1) comprises a fixed seat body (11), a movable seat body (12) and an adjustment component. The fixed seat body (11) is provided with a movable groove (13) extending through the left and right sides. The movable seat body (12) is slidably arranged in the movable groove (13). Both ends of the movable seat body (12) are connected with a limit plate (14) which fits the left and right sides of the fixed seat body (11). The adjustment component is connected to the fixed seat body (11) and the movable seat body (12). ), the adjustment assembly comprises an upper push rod (15) and a lower push rod (16); the upper push rod (15) passes through the fixed seat body (11) and the movable seat body (12) from bottom to top in sequence, the upper end of which abuts against the top wall of the movable groove (13), and the upper push rod (15) is threadedly connected to the movable seat body (12); the lower push rod (16) passes through the fixed seat body (11) from bottom to top into the movable groove (13), the upper end of which abuts against the bottom surface of the movable seat body (12), and the lower push rod (16) is threadedly connected to the fixed seat body (11); A power mechanism (2) is detachably connected to the assembly mechanism (1) and can be adjusted in translation on the assembly mechanism (1); The patch mechanism (3) comprises a driving assembly and a suction nozzle assembly, wherein the suction nozzle assembly is connected to the output end of the driving assembly and is driven to rotate by the driving assembly, wherein the driving assembly comprises a driving motor (31) and a motor mounting seat (32), wherein the driving motor (31) is detachably connected to the motor mounting seat (32), wherein the motor mounting seat (32) is connected to the connecting mechanism (4), and the suction nozzle assembly is connected to the output shaft of the driving motor (31), wherein the suction nozzle assembly comprises a suction nozzle rod (33) and a suction nozzle (34), wherein the suction nozzle rod (33) is connected to the output shaft of the driving motor (31), and the suction nozzle (34) is arranged at one end of the suction nozzle rod (33) away from the driving motor (31); and The connecting mechanism (4) is connected to the power output end of the power mechanism (2) and outputs the power outwards. One end is connected to the connecting mechanism (4) and the other end is connected to the driving assembly. The end connected to the driving assembly is provided with a limit assembly for controlling the deflection range of the suction nozzle assembly.

2. The assembly head module of a high-precision desktop SMT placement machine according to claim 1, characterized in that: The power mechanism (2) is detachably connected to the limit plate (14), and comprises a mounting plate (21) and a driving cylinder (22); the mounting plate (21) is detachably connected to the limit plate (14), and a piston rod of the driving cylinder (22) is downwardly connected to the mounting plate (21).

3. The assembly head module of a high-precision desktop SMT placement machine according to claim 1, characterized in that: The connecting mechanism (4) comprises a first mounting seat (41) connected to the output end of the power mechanism (2), a second mounting seat (42) connected to the motor mounting seat (32), and a connecting rod (43) connected between the first mounting seat (41) and the second mounting seat (42), wherein two connecting rods (43) are provided and are arranged on two sides of the assembly mechanism (1) opposite to each other.

4. The assembly head module of a high-precision desktop SMT placement machine according to claim 3, characterized in that: The second mounting seat (42) is configured as a circular sleeve coaxial with the suction nozzle rod (33); at least two sliding grooves (44) penetrating the inner and outer sides are circumferentially provided on the side wall of the second mounting seat (42); the limit assembly is slidably arranged in the sliding groove (44) and can be fixed; a positioning baffle (35) is fixed on the suction nozzle rod (33); as the suction nozzle rod (33) rotates, the positioning baffle (35) can abut against the limit assembly.

5. The assembly head module of a high-precision desktop SMT placement machine according to claim 4, characterized in that: The limiting assembly comprises a slider (45) radially arranged along the second mounting seat (42) and a positioning rod (46) penetrating the slider (45) along the radial direction of the second mounting seat (42); the positioning rod (46) is threadedly connected to the slider (45), and the front end is used to abut against the positioning baffle (35).

6. The assembly head module of a high-precision desktop SMT placement machine according to claim 5, characterized in that: The lower surface of the slide block (45) is vertically connected with a locking rod (47), the bottom wall of the sliding groove (44) is provided with a locking groove (48), and the locking rod (47) passes through the locking groove (48) and is connected with a locking nut.

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