A jacking mechanism for a chip mounter

Abstract

The application relates to a jacking mechanism for a patch machine. A base is provided with a through groove in a first direction and forms a first port and a second port; a filler groove, an assembly groove and an annular groove are arranged on the first port side; an air extraction groove in the base is communicated with the through groove and extends to the second port, and a butt joint groove is formed at the second port to be sealed and butted with a connecting port of the ejection mechanism. A top rod is arranged to pass through the first port and has two ends extending out, and a gap is left between the through section and the groove wall; a connecting piece is arranged at the third port, and a flow channel of the connecting piece is communicated with the air extraction groove and an external vacuum; the gap is filled with filler, a first annular piece is matched with a first sealing ring and axially limits the first sealing ring. Due to the combination of the above structure and the communication relationship, a short-path air extraction channel can be formed, negative pressure adsorption can be quickly and stably established, leakage can be reduced, adsorption stability and displacement controllability during grading jacking can be improved, and low-friction coaxial guidance and modularization and compactness of the top rod can be realized.

Description

Technical Field

[0001] This utility model relates to a lifting mechanism for a pick and place machine, and more particularly to a lifting mechanism for a pick and place machine. Background Technology

[0002] After dicing, wafers are typically fixed to a frame with a blue film. At the pick-and-place machine's pick-and-place station, an ejector mechanism is needed to create relative displacement between the blue film and the die, allowing the pick-and-place head to smoothly separate and transfer the die from the blue film. Common process requirements for this station include: before / during the ejection action, ensuring a stable negative pressure adsorption between the contact surface of the ejector mechanism and the blue film; under adsorption, driving the ejector pins (or ejector columns) to achieve controlled, graded (e.g., three-stage) ejection displacement; and ensuring a compact mechanism, reliable sealing, and easy integration with the entire pick-and-place machine.

[0003] In existing production lines, the ejector mechanism typically includes a built-in vacuum chamber and air passage, with negative pressure introduced from the mechanism side. The accompanying lifting components (which can be understood as the lifting seat and reciprocating ejector rod, etc.) mostly provide linear guidance and basic sealing through guide holes, bushings (or simple bearings), and single-ring seals. The ejector rod passes through the lifting seat and connects to the external drive. The seat and ejector mechanism typically use a planar fit or gasket-type sealing connection. In this type of structure, the airflow channel is mainly located inside the ejector mechanism; the lifting seat lacks a dedicated extraction path formed by its body and directly connected to the docking port, as well as a specific docking geometry. The ejector rod insertion point is usually sealed with a clearance seal, and the seat and docking interface are often general-purpose planar seals or simplified structures.

[0004] Under the aforementioned coordination, the current solution struggles to simultaneously achieve the following at the connection interface between the lifting seat and the ejector mechanism: a stable, sealed connection with the ejector mechanism's port and effective, short-path delivery of external vacuum to that port; reliable sealing and good guidance of the through-channel through which the ejector rod passes; and a compact, modular design for easy assembly. The direct consequence is that vacuuming relies on the internal air passage on the ejector mechanism side for connection to the distal side. The lifting seat side lacks a clear, low-resistance, and sealable air extraction channel and a dedicated docking slot, making it prone to leakage at the ejector rod fitting gap and the seat-to-dock junction. The stability of the negative pressure adsorption fluctuates due to the staged lifting process of the ejector rod, thus affecting the stable separation of grains from the blue film and the consistency of the cycle. Therefore, a novel lifting mechanism is urgently needed to address these problems. Utility Model Content

[0005] The purpose of this invention is to provide a lifting mechanism for a chip mounter that can clearly establish the air extraction communication relationship between its base and the external vacuum source, through groove and docking interface, and take into account both top rod guidance and sealing within the same structural system, thereby improving adsorption stability and the controllability of the graded lifting process.

[0006] The technical solution adopted by this utility model to solve the above problems is: a lifting mechanism for a pick-and-place machine, used to cooperate with the ejection mechanism in the pick-and-place machine, characterized in that it includes: The base has a through groove along a first direction, and the two ends of the through groove extend to the surface of the base to form a first port and a second port, respectively. The base has a filling groove along the first direction at the first port, and an assembly groove is provided on the inner wall of the filling groove away from the first port. An annular groove is formed on the inner wall of the assembly groove. The base also has an extraction groove inside, which communicates with the through groove and extends towards the second port, forming a docking groove at the second port. The docking groove is used for a sealed connection with the connection port of the ejection mechanism. A push rod is inserted into the through groove through the first port, and both ends of the push rod extend beyond the base. A gap is left between the outer surface of the portion of the push rod located in the through groove and the inner wall of the through groove. A connector is provided at the third port, which is formed by the extension of the end of the suction groove away from the through groove to the surface of the base; the connector has a through flow channel inside, one end of which is connected to the suction groove, and the other end is used to connect to an external vacuum source. The packing material is disposed in the packing groove to fill the gap between the outer surface of the push rod and the inner wall of the packing groove; A first annular component is disposed within the assembly groove, through which the push rod passes; the shape and size of the outer ring of the cross-section of the first annular component are the same as the shape and size of the cross-section of the assembly groove, and the inner ring of the cross-section of the first annular component is circular, with the corresponding diameter being equal to the diameter of the push rod; A first sealing ring is disposed at the annular groove. The inner side of the first sealing ring abuts against the outer surface of the push rod to seal the through groove. The first sealing ring is located between the packing and the first annular member. The side of the first sealing ring away from the first annular member abuts against the packing, and the side of the first sealing ring away from the packing abuts against the first annular member to restrict the axial displacement of the first annular member.

[0007] The connector, the air extraction groove, and the docking groove form an air extraction channel for extracting air from the inside of the ejection mechanism.

[0008] Preferably, the mating groove is configured as a conical sealing surface or a stepped sealing surface on the side away from the second port, and a second annular member is provided in the mating groove. The outer surface of the second annular member is in contact with the inner wall of the mating groove. The inner circle of the cross-section of the second annular member is circular and the corresponding diameter is equal to the diameter of the top rod. A plurality of through air passages are provided axially inside the second annular member. Each air passage is spaced apart from each other and arranged in a ring array around the center of the second annular member. The air passages are connected to the suction groove and the mating groove.

[0009] Preferably, the base is a cylindrical structure, and the first direction is the extension direction of the cylindrical structure; an annular step is constructed on the outer periphery of the base near the second port, and a second sealing ring is fitted at the connection between the base and the annular step to achieve circumferential sealing when the lifting mechanism and the ejection mechanism are docked.

[0010] Preferably, the adapter is disposed at one end of the top rod extending from the second port to the outside of the base, and the adapter is detachably connected to the top rod.

[0011] Preferably, the push rod has an annular flange extending from the second port to the periphery of the base, and the annular flange has a through-hole along the axial direction of the push rod. The through-hole is configured such that, in the initial state of the lifting mechanism, the side of the annular flange facing the base fits against the surface of the base at the second port, and the through-hole communicates with the mating groove.

[0012] Preferably, the push rod is detachably connected to the output shaft of the servo motor via a coupling or spline.

[0013] Preferably, the first annular component is made of a self-lubricating material, which includes one or more of polytetrafluoroethylene, polyetheretherketone, or oil-containing porous metal; the inner surface of the first annular component is provided with annular or axial microgrooves for reducing friction.

[0014] Preferably, the base is provided with a mounting structure for cooperating with the mounting interface of the pick-and-place machine frame or the ejection mechanism. The mounting structure includes at least one of threaded holes, countersunk holes or locating pin holes, and is distributed circumferentially around the second port.

[0015] Preferably, the cone angle of the conical sealing surface of the mating groove is 60° to 100°, and the cone angle is the included angle between the two generatrices of the conical sealing surface.

[0016] Beneficial effects of the embodiments of this utility model Because this design integrates a through-groove, assembly, annular, and packing groove into the base, forming a guide and sealing structure for the push rod, and connects to the through-groove via an extraction groove extending to the second port, forming a docking groove at the second port for sealing and connecting with the ejection mechanism, and provides a third port and connector on the outside of the base that connects to the extraction groove to communicate with an external vacuum source, and uses a first annular component in conjunction with a first sealing ring and packing to form a composite pair for axial limiting and gap sealing, this design effectively solves the technical problems in the prior art, such as the lack of a clear and low-resistance extraction channel and dedicated docking geometry on the lifting seat side, insufficient sealing and guidance at the push rod penetration point, and unstable negative pressure adsorption due to leakage at the seat and docking interface. This achieves the following technical effects: rapid establishment and stable maintenance of the external vacuum via the third port, extraction groove, docking groove, and ejection mechanism connection port; stable adsorption and controllable displacement during the staged lifting process under ejection conditions; low-friction and high-coaxial guidance of the push rod movement; and modular assembly and maintenance. Attached Figure Description

[0017] Figure 1 A schematic structure of the lifting mechanism proposed in one embodiment of the present invention is shown. Figure 1 .

[0018] Figure 2 A schematic cross-sectional view of the lifting mechanism proposed in one embodiment of the present invention is shown.

[0019] Figure 3 A schematic structure of the lifting mechanism proposed in one embodiment of the present invention is shown. Figure 2 .

[0020] Wherein: 10, base; 110, through groove; 120, first port; 130, second port; 140, packing groove; 150, assembly groove; 160, annular groove; 170, suction groove; 180, butt groove; 190, conical sealing surface; 200, annular step; 20, top rod; 210, annular flange; 211, connecting hole; 30, connector; 310, flow channel; 40, packing; 50, first annular component; 60, first sealing ring; 70, second annular component; 710, air passage; 80, second sealing ring. Detailed Implementation

[0021] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0022] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] See Figures 1 to 3 In a preferred embodiment of this application, a lifting mechanism is provided for cooperation with the ejection mechanism in a chip mounter. The ejection mechanism includes a connection port, which is sealed to one end of the base 10 (described later) with an air inlet groove. This allows the air in the ejection mechanism to be drawn away through the connection port while a vacuum is being drawn after the ejection mechanism has traveled a preset stroke under the action of the lifting mechanism. This completes the adsorption of the blue film and the positioning of the divided granules on the blue film.

[0025] The lifting mechanism includes a base 10, a top rod 20, a connector 30, a packing 40, a first annular component 50, and a first sealing ring 60. The base 10 has a through groove 110 along a first direction, with its two ends extending to the surface of the base 10 to form a first port 120 and a second port 130, respectively. At the first port 120, the base 10 has a packing groove 140 along the first direction. The inner wall of the packing groove 140, away from the first port 120, has an assembly groove 150, and the inner wall of the assembly groove 150 has an annular groove 160. The base 10 also has an extraction groove 170 inside, which communicates with the through groove 110 and extends towards the second port 130. A docking groove 180 is formed at port 130, which is used for sealing docking with the connection port of the ejection mechanism; the push rod 20 passes through the through groove 110 via the first port 120, and both ends of the push rod 20 extend beyond the base 10, with a gap between the outer surface of the portion of the push rod 20 located in the through groove 110 and the inner wall of the through groove 110; the connecting member 30 is provided at the third port, which is formed by the exhaust groove 170 extending away from the through groove 110 to the surface of the base 10; the connecting member 30 has a through flow channel 310 inside, One end of the flow channel 310 is connected to the suction groove 170, and the other end is used to connect to an external vacuum source; the packing 40 is disposed in the packing groove 140 to fill the gap between the outer surface of the push rod 20 and the inner wall of the packing groove 140; the first annular member 50 is disposed in the assembly groove 150, through which the push rod 20 passes; the shape and size of the outer ring of the cross-section of the first annular member 50 are the same as the shape and size of the cross-section of the assembly groove 150, and the inner ring of the cross-section of the first annular member 50 is circular, and the corresponding diameter is equal to the diameter of the push rod 20; the first sealing ring 60 is disposed at the annular groove 160. The inner side of the first sealing ring 60 abuts against the outer surface of the push rod 20 to seal the through groove 110. The first sealing ring 60 is located between the packing 40 and the first annular member 50. The side of the first sealing ring 60 away from the first annular member 50 abuts against the packing 40, and the side of the first sealing ring 60 away from the packing 40 abuts against the first annular member 50 to restrict the axial displacement of the first annular member 50. The connecting member 30, the air extraction groove 170 and the docking groove 180 form an air extraction channel for extracting air from the inside of the ejection mechanism.

[0026] Specifically: A filling groove 140 and an assembly groove 150 are formed sequentially on the side of the first port 120. An annular groove 160 is formed on the inner wall of the assembly groove 150 to accommodate the first sealing ring 60. The base 10 is also provided with an air extraction groove 170, which is connected to the through groove 110 and extends to the side of the second port 130. A docking groove 180 is formed at the second port 130, which is used to achieve a sealed docking with the connection port of the ejection mechanism.

[0027] The push rod 20 passes through the through groove 110 from the first port 120 and through the base 10, with both ends extending outwards for connection to the external drive and passive ends. An annular gap is left between the outer surface of the push rod 20 in the through groove 110 and the inner wall of the through groove 110, and this annular gap is filled and sealed by the packing 40.

[0028] The connector 30 is installed at the third port, which is formed by extending from the end of the evacuation groove 170 away from the through groove 110 to the outer surface of the base 10. The connector 30 has a through flow channel 310 inside, one end of which is connected to the evacuation groove 170 and the other end is used to connect to an external vacuum source, thereby creating an independent and continuous evacuation path within the base 10.

[0029] The first annular component 50 is disposed within the assembly groove 150, through which the push rod 20 passes. The outer ring of the first annular component 50 matches the cross-sectional shape and size of the assembly groove 150, and the inner ring is circular and has the same diameter as the push rod 20, thereby achieving coaxial guidance of the push rod 20.

[0030] The first sealing ring 60 is embedded in the annular groove 160, and its inner side is in contact with the outer surface of the push rod 20 to provide radial sealing to the through groove 110. The first sealing ring 60 is located between the packing 40 and the first annular member 50 and abuts against both of them, thereby axially limiting the first annular member 50 and preventing it from moving within the assembly groove 150.

[0031] During assembly, the first annular component 50 is first pressed into the assembly groove 150 from the first port 120 side to the positioning surface, so that its outer ring is in place with an interference or clearance fit with the assembly groove 150; then, the first sealing ring 60 is placed in the annular groove 160, ensuring that its inner lip and the mating surface with the push rod 20 are clean and burr-free. Next, the packing 40 is pressed into the packing groove 140 from the first port 120 direction, so that it forms a surface contact or surface-line composite contact with the outer surface of the push rod 20 and the inner wall of the packing groove 140 to obtain stable axial preload and circumferential sealing. The push rod 20 passes through the through groove 110 from the first port 120 and through the first annular component 50 and the first sealing ring 60 to verify its sliding resistance and coaxiality throughout the entire stroke. The connecting component 30 is fixed to the third port by means of threads, snap rings or flanges, and a sealing gasket or sealing ring is provided between the connecting component 30 and the base 10 to ensure air extraction sealing. After installation, ensure that the docking groove 180 and the connection port of the ejector mechanism are sealed together by end face or conical surface, and confirm the sealing pressure at the docking point and the coaxial alignment to ensure that the air extraction path is continuous and unobstructed.

[0032] During operation, an external vacuum source enters the suction groove 170 through the flow channel 310 of the connector 30, and acts on the docking interface through the connection between the suction groove 170 and the docking groove 180. Since the first sealing ring 60 forms an axial seal on the through groove 110, the vacuum negative pressure will not leak along the annular gap of the push rod 20 to the first port 120 side, but will be transmitted to the sealing connection port via the docking groove 180. The push rod 20 reciprocates along the first direction under the action of the external drive mechanism. The first annular member 50 provides coaxial guidance and restricts the radial swing of the push rod 20. The packing 40 forms an auxiliary seal and damping on the outer surface of the push rod 20, ensuring smooth sliding and reliable sealing of the push rod 20 throughout its stroke. The suction path is formed by the connector 30, the suction groove 170, and the docking groove 180 in sequence, creating a short negative pressure transmission link, thereby maintaining a stable sealing and vacuum effect during the lifting process.

[0033] This embodiment is applicable to common operating conditions at the pick-and-place machine station. The mating surfaces of the base 10, the first annular component 50, and the first sealing ring 60 should be kept clean and dry, and the mounting surfaces should be free of oil and impurities. The mating interface must have sufficient flatness or conical coaxiality to ensure a tight seal. The connection between the connector 30 and the external vacuum source should avoid hose bending or interface loosening to prevent affecting negative pressure stability. During equipment operation, it is recommended to use the equipment under normal temperature and humidity conditions, and the material's temperature resistance, media resistance, and abrasion resistance should be selected based on the on-site process.

[0034] The base 10 can be made of metal or engineering plastic, and its shape can be designed as a columnar or near-columnar structure according to the installation space. The sealing surface of the mating groove 180 can be an end face, a conical surface, or a stepped composite surface, and appropriate sealing elements can be selected according to the structural characteristics of the mating port. The first annular member 50 can be a metal bushing, an engineering plastic bushing, or a composite bushing containing solid lubricant, and the inner hole can be provided with micro-grooves to store lubricating medium and reduce friction. The filler 40 can be a compressible filler material or a composite filler 40 to form radial elastic compensation. The connector 30 can be a straight-through type or a structure with a conversion interface to adapt to different types of external vacuum sources. None of the above optional solutions change the basic technical concept of the connection between the evacuation groove 170 and the through groove 110 and the formation of the mating groove 180 at the second port 130 and its sealing connection with the connecting port.

[0035] In this embodiment, the top rod 20 is integrated into the base 10 with a through groove 110, an assembly groove 150, an annular groove 160, and a packing groove 140 for guiding and sealing. It also extends from the extraction groove 170 to the second port 130, forming a docking groove 180 for sealing with the connecting port. Simultaneously, a third port and connector 30 are provided on the outside of the base 10, communicating with the extraction groove 170 to connect with an external vacuum source. Furthermore, the first annular component 50, in conjunction with the first sealing ring 60 and the packing 40, forms a composite pair for axial limiting and gap sealing. Therefore, this effectively solves the problems in the prior art, such as the lack of a clear and low-resistance extraction communication channel and dedicated docking interface on the base side, insufficient sealing and guidance at the top rod 20 penetration point, and easy leakage at the docking point leading to unstable negative pressure. This achieves the technical effects of rapid establishment and stable maintenance of a short vacuum path, controllable displacement and coaxial guidance during the lifting process, convenient assembly and maintenance, and a compact structural layout.

[0036] See Figure 3 In some further embodiments, the mating groove 180 forms a conical sealing surface 190 or a stepped sealing surface on the side away from the second port 130. A second annular member 70 is provided in the mating groove 180, the outer surface of which fits against the inner wall of the mating groove 180. The inner circle of the cross-section of the second annular member 70 is circular, and its corresponding diameter is equal to the diameter of the push rod 20. A plurality of through air passages 710 are provided axially inside the second annular member 70. Each air passage 710 is spaced apart from each other and arranged in a circular array around the center of the second annular member 70. The air passages 710 communicate with the suction groove 170 and the mating groove 180. Furthermore, the cone angle of the conical sealing surface 190 of the mating groove 180 is 60° to 100°, and the cone angle is the included angle between the two generatrices of the conical sealing surface 190.

[0037] Specifically: The side of the docking groove 180 away from the second port 130 is made into a sealing surface. The sealing surface can be a conical sealing surface 190 or a stepped sealing surface.

[0038] The outer surface of the second annular component 70 fits against the inner wall of the mating groove 180 to form a stable surface contact seal and coaxial guiding relationship. The inner circle of the cross-section of the second annular component 70 is circular, and the diameter of the inner circle is equal to the diameter of the push rod 20, which is used to provide coaxial constraint and geometric limit for the push rod 20 in the mating area. Several through air passages 710 are formed inside the second annular component 70 along its axial direction. The air passages 710 are spaced apart from each other and distributed in a ring array around the center of the second annular component 70, so that the internal gas can be evenly distributed in the circumferential direction and then flow into or out in the axial direction. Each air passage 710 is connected to the suction groove 170 and the mating groove 180, thereby establishing a circumferentially distributed connecting channel in the mating area. For the conical sealing surface 190, its cone angle is the included angle between the two generatrices, preferably in the range of 60 degrees to 100 degrees.

[0039] During assembly, the second annular component 70 is pressed in from the direction of the mating groove 180, so that its outer surface and the inner wall of the mating groove 180 achieve a stable fit with an interference or clearance fit. Preferably, the contact area is a continuous circumferential surface contact to reduce end leakage channels. If a conical sealing surface 190 is used, the second annular component 70 and the conical surface will generate a self-centering effect through axial pressing; if a stepped sealing surface is used, axial positioning and end face sealing will be achieved through the shoulder surface. The inner ring of the second annular component 70 and the push rod 20 have a smooth fit or a small clearance fit to ensure that the push rod 20 does not get stuck when it reciprocates in the mating area. After assembly, each through air passage 710 in the second annular component 70 should be connected to the opening area of ​​the suction groove 170, and its circumferential array should be connected to the opening area of ​​the mating groove 180 to form a continuous circumferential distribution and axial convergence path.

[0040] During operation, an external vacuum is introduced into the mating area through the suction groove 170. Since several air channels 710 inside the second annular component 70 are simultaneously connected to the suction groove 170 and the mating groove 180, the negative pressure is first evenly distributed circumferentially within the second annular component 70, and then flows axially into the mating groove 180 along each air channel 710, thus forming a uniform pressure field at the mating interface. The geometric self-centering characteristics of the conical sealing surface 190 or the end-face positioning characteristics of the stepped sealing surface ensure a stable fit between the mating groove 180 and the mating end. The inner ring of the second annular component 70 provides coaxial guidance and clearance control for the push rod 20, ensuring that the negative pressure at the mating interface remains undisturbed during the reciprocating motion of the push rod 20.

[0041] The conical sealing surface 190 is suitable for scenarios requiring self-centering and rapid bonding, while the stepped sealing surface is suitable for scenarios with clear end-face positioning, limited installation space, or the need for end-face thrust. The second annular component 70 can be machined from metal, engineering plastics, or composite materials containing self-lubricating components, and its inner ring can be polished or micro-textured to reduce friction. The number, cross-sectional shape, and circumferential spacing of the air passages 710 can be optimized according to the air extraction volume requirements and pressure drop targets, but a reliable connection between the circumferentially uniform distribution and the extraction groove 170 and the mating groove 180 should be maintained.

[0042] In this embodiment, a conical or stepped sealing surface is used on the side of the docking groove 180 away from the second port 130, and a second annular member 70 is provided in the docking groove 180 to fit against the inner wall. The inner ring of the second annular member 70 has the same diameter as the top rod 20, and several through air passages 710 are arranged in an axial array inside it and communicate with the air extraction groove 170 and the docking groove 180. Therefore, the technical problems of unstable sealing and fitting of the docking interface, uneven distribution of negative pressure in the docking area, and insufficient coaxial guidance at the passage of the top rod 20 in the prior art are effectively solved. Thus, the technical effects of self-centering or end face positioning at the docking point, uniform circumferential distribution of negative pressure and low axial resistance convergence, and low friction coaxial guidance of the top rod 20 in the docking area are achieved.

[0043] See Figure 1 In some further embodiments, the base 10 is a cylindrical structure, and the first direction is the extension direction of the cylindrical structure; the base 10 has an annular step 200 on its outer periphery near the second port 130, and a second sealing ring 80 is fitted at the connection between the base 10 and the annular step 200 to achieve circumferential sealing when the lifting mechanism and the ejection mechanism are docked.

[0044] Specifically: Structure and Composition The base 10 has a cylindrical appearance, and the first direction is the axial direction of the cylinder.

[0045] An annular step 200 is formed on the outer periphery of the base 10 near the second port 130. The annular step 200 and the base 10 body form a continuous circumferential connecting transition surface at the outer periphery. A second sealing ring 80 is fitted at this connection, so that the second sealing ring 80, the outer periphery of the base 10, and the end face of the annular step 200 together form an annular sealing band. To improve assembly and sealing stability, a guide chamfer can be provided on the outer edge of the annular step 200 to guide its fit with the sealing surface of the mating parts. The second sealing ring 80 is preferably a circular or lip-shaped cross-section structure made of an elastomer, which can obtain elastic deformation in both the radial and axial directions, thereby forming a composite seal of surface contact or line contact during mating. The axis of the cylindrical base 10 is aligned with the first direction, so that the roundness and coaxiality of the annular step 200 are naturally aligned with the first direction, which is conducive to achieving uniform circumferential sealing and tightening.

[0046] During assembly, the second sealing ring 80 is first fitted onto the connection between the base 10 and the annular step 200, allowing it to naturally adhere to the outer circumferential transition surface. Then, the mating parts are brought closer to the base 10 along the first direction, and the sealing surfaces of the mating parts are pressed against the second sealing ring 80. The second sealing ring 80 undergoes elastic compression in both the axial and radial directions, thus forming a continuous seal across the entire circumference. To avoid trapping foreign matter, the annular step 200 and adjacent outer circumferences should be cleaned and deburred before assembly. If necessary, a shallow groove can be provided on the outer circumference of the connection to limit the axial movement of the second sealing ring 80 and ensure a stable sealing position.

[0047] In operation, the mating parts are fitted against the base 10 along the first direction, the second sealing ring 80 is axially compressed and radially rebounds, and the circumferential step serves as a thrust and positioning reference, providing a stable compression boundary for the sealing ring. Due to the circumferential geometric consistency of the cylindrical base 10, the compression of the sealing ring is essentially uniform across the entire circumference, thus forming a uniform and continuous circumferential seal at the mating interface, preventing leakage at the mating point. During device operation, even with minor lateral disturbances caused by the lifting action, the annular step 200 can still provide circumferential support and end-face positioning, maintaining the stress and positional stability of the sealing ring.

[0048] To achieve a stable seal, the form and position tolerances and surface finish of the transition surface between the annular step 200 and the base 10 should meet the sealing requirements. The material of the second sealing ring 80 should be compatible with the field medium and have resistance to compression set and wear. Applying a small amount of compatible lubricating medium between the sealing ring and the mating surface during assembly can reduce assembly friction and reduce twisting.

[0049] The annular step 200 can be a single step or a multi-step composite form to adapt to the sealing surfaces of mating parts of different thicknesses or shapes; the second sealing ring 80 can adopt a circular cross-section, double lip cross-section or trapezoidal cross-section, etc., to obtain a more suitable sealing specific pressure under different clamping methods; to enhance guidance, a narrow ring shoulder can be added to the outer periphery of the annular step 200 to play a secondary positioning and anti-slip role; the base 10 material can be metal or engineering plastic, and the choice can be made according to the requirements of weight, rigidity and corrosion resistance.

[0050] In this embodiment, since a cylindrical base 10 is used and the first direction is used as the axial reference, an annular step 200 is set on the outer periphery near the second port 130 and a second sealing ring 80 is fitted at the connection, a circumferentially continuous positioning and pressing interface is obtained at the docking position. Therefore, the technical problems of unstable positioning, uneven sealing force and easy leakage at the docking position in the prior art are effectively solved, thereby achieving the technical effects of circumferential uniform sealing, smooth assembly guidance and improved docking reliability.

[0051] See Figure 1 and Figure 3 In some further embodiments, the lifting mechanism includes an adapter disposed at one end of the top rod 20 extending outside the base 10 via the second port 130, the adapter being detachably connected to the top rod 20.

[0052] Specifically: The adapter body is preferably a hollow or axially oriented component with a central hole, whose inner hole mates with the outer circle of the push rod 20, forming a stable coaxial positioning in the axial and radial directions. To achieve a detachable connection, a reusable mechanical connection pair is provided between the adapter and the push rod 20. This connection pair can be any one or a combination of threaded engagement, expansion sleeve clamping, clamping, spline engagement, tapered surface fitting with a pressure cap, and pin key positioning. To prevent loosening, a circumferential anti-reverse structure, end face shoulder, or elastic stop element can be provided at the connection point. The outer surface of the adapter can have a wrench position, knurled strip, or tool hole to facilitate force application during installation and disassembly. To improve durability, the adapter can be made of wear-resistant metal or engineering plastic material, and the inner hole mating surface can be polished or surface hardened to reduce wear during assembly and disassembly.

[0053] During assembly, first clean the area around the second port 130 and the outer surface of the push rod 20. Then, guide the adapter along the axial direction of the push rod 20, ensuring the inner hole is aligned with the push rod 20 via interference, clearance, or positioning fit. If it is a threaded connection, first manually tighten it to the desired position, then use a wrench to apply appropriate pre-tightening. If it is an expansion sleeve or clamp connection, use axial fasteners to generate radial clamping force. If it is a tapered surface fitting with a pressure cap, first allow the tapered surface to self-center and fit, then use the pressure cap to axially press and secure it with a locking structure. After completion, check whether the relative position of the adapter end face and the outer side of the second port 130 meets the usage requirements, and verify the axial movement and radial clearance of the adapter relative to the push rod 20.

[0054] During use, the push rod 20 reciprocates axially, and the adapter moves synchronously with the push rod 20, accurately transmitting axial force or displacement to the external connected object. The detachable connection allows the adapter to be removed simply by disconnecting the connecting pair when changing tooling, adjusting external interfaces, or performing maintenance, without disassembling the base 10 and internal sealing structure, thus reducing downtime and the risk of repeated assembly. The coaxial positioning and clamping method of the adapter ensures a stable force transmission path and geometric position under reciprocating loads and environmental vibrations.

[0055] To ensure long-term stability, the coaxiality and fit tolerances of the adapter and top rod 20 should be controlled. The contact surfaces of the connecting parts should be kept clean and burr-free, and a thin layer of material-compatible lubricant should be applied during assembly to reduce assembly torque and wear. For threaded or cap-type structures, clear preload markings or positioning stops should be provided to prevent damage from overtightening or loosening from undertightening. For expansion sleeve and clamp structures, it is recommended to perform a re-inspection and tightening after the first run to ensure stable clamping force.

[0056] The adapter can be designed as a straight-through, stepped, or shouldered shape to adapt to different external connection heights and tool application methods; the connection pair can be switched between threaded and expansion sleeve to meet different assembly cycle and reuse requirements; to prevent misassembly, a unique locating key or marking line can be set on the adapter and the push rod 20; in the case of electrical insulation or vibration reduction, a thin insulating bushing or elastic damping pad can be added between the adapter and the push rod 20.

[0057] In this embodiment, since an adapter is provided at the position where the top rod 20 extends through the second port 130 and forms a detachable connection with the top rod 20, the technical problems of cumbersome interface replacement, long downtime and high risk of secondary sealing caused by disassembling the base 10 and internal seals for maintenance in the prior art are effectively solved. Thus, the technical effects of quick replacement of external interface, stable coaxial force transmission and simplified maintenance are achieved.

[0058] See Figures 1 to 3 In some further embodiments, the push rod 20 has an annular flange 210 extending from the second port 130 to the periphery of the base 10. The annular flange 210 has a through-hole 211 along the axial direction of the push rod 20. The through-hole 211 is configured such that, in the initial state of the lifting mechanism, the side of the annular flange 210 facing the base 10 is in contact with the surface of the base 10 at the second port 130, and the through-hole 211 communicates with the docking groove 180.

[0059] Specifically: The side of the annular flange 210 opposite to the base 10 is a mating surface, which is mated to the outer surface of the base 10 at the second port 130 when assembled and in its initial state. The annular flange 210 has several through holes 211 extending axially along the push rod 20. Each through hole 211 opens from the side of the annular flange 210 closest to the base 10 and extends along the axis of the push rod 20 to the opposite side of the annular flange 210, ensuring that it remains connected to the mating groove 180 at the second port 130 even when mated. The annular flange 210 can be integrally machined with the push rod 20, or it can be coaxially connected by a fitted assembly. A small chamfer can be provided on the mating surface to reduce assembly scratches and improve surface contact stability.

[0060] During assembly, the push rod 20 passes through the through slot 110 and extends out of the second port 130 to the predetermined position. The mating surface of the annular flange 210 aligns with the outer surface of the base 10 and forms surface contact. Then, it is checked whether the opening position of the connecting hole 211 and the opening area of ​​the mating groove 180 are within the effective communication range. If necessary, the axial position of the push rod 20 is finely adjusted to ensure stable communication in the initial state. To avoid foreign objects getting stuck on the mating surface, the mating surface and the outer surface of the base 10 are cleaned and deburred before assembly, and light lubrication is applied to the mating surface to reduce initial mating friction.

[0061] In use, the mating surface of the annular flange 210 forms an end positioning and axial stop with the outer surface of the base 10, and the push rod 20 is in its initial position. External air is drawn into the mating groove 180 through the internal channel of the base 10. The connecting hole 211 remains unobstructed with the mating groove 180 even when the annular flange 210 is in the mating state, and the negative pressure is not blocked due to the mating. After the push rod 20 begins to move axially, the mating surface gradually moves away from the outer surface of the base 10, and the effective flow section of the connecting hole 211 remains stable, thereby maintaining the continuous connection of the mating groove 180 during the displacement change of the push rod 20 and reducing transient air resistance fluctuations caused by the relative displacement of the end faces.

[0062] To ensure both fit and connectivity stability, the flatness and roughness of the mating surface of the annular flange 210 should be controlled, and it should be kept coaxially aligned with the outer surface of the base 10. The axial straightness and wall finish of the connecting hole 211 should meet the low flow resistance requirements, and sharp angles at the hole opening should be removed to avoid stress concentration and wear. The fitted annular flange 210 should employ a reliable anti-loosening structure to ensure that no relative slippage occurs under reciprocating loads and vibration environments.

[0063] The connecting holes 211 can be arranged at equal intervals in the circumferential direction to obtain a more uniform circumferential distribution; the cross-sectional shape of the holes can be circular or approximately elongated to adjust the flow resistance characteristics as needed; annular micro-shoulders can be provided on the mating surface to improve the repeatability of end face positioning; thin wear-resistant gaskets can also be added to the annular flange 210 to reduce surface wear caused by long-term mating. None of the above alternatives change the basic concept of providing connecting holes 211 along the axial direction of the top rod 20 on the annular flange 210 and maintaining communication between the connecting holes 211 and the mating groove 180 in the initial mating state.

[0064] In this embodiment, since an annular flange 210 is provided at the extension of the push rod 20 and a through-hole 211 is opened in the flange along the axial direction, and the annular flange 210 is made to fit the outer surface of the base 10 in the initial state and the through-hole 211 is kept connected to the docking groove 180, the technical problems of easy blockage of the channel during end fitting, unstable connection when the push rod 20 starts and stops, and transient air resistance fluctuations in the prior art are effectively solved. Thus, the technical effects of continuous channel connection, more stable negative pressure establishment and maintenance, and more reliable end positioning are achieved throughout the fitting positioning and reciprocating motion.

[0065] In some further embodiments, the push rod 20 is detachably connected to the output shaft of the servo motor via a coupling or spline.

[0066] Specifically: The drive end of the push rod 20, located outside the base 10, is connected to the output shaft of the servo motor via a detachable transmission component. This transmission component can be a coupling or a spline pair. The coupling body is arranged axially along the push rod 20 and the motor shaft, with its inner hole fitting with the outer circle of the push rod 20 and the outer circle of the motor shaft, respectively. Axial fasteners or clamping structures are provided to achieve reliable clamping and rapid release. For the spline connection, an external spline is machined at the end of the push rod 20, forming a radial positioning and circumferential torque transmission fit with the internal spline at the end of the motor shaft. An end face cap or locking ring can be provided to restrict axial movement. To ensure coaxiality and stability of the transmission, the positioning reference of the transmission component is collinear with the axis of the push rod 20. Chamfers and guide surfaces are preferably provided at the connection point to facilitate assembly and reduce scratches.

[0067] During assembly, first align the output shaft of the servo motor with the axis of the push rod 20, ensuring they are coaxially aligned in space. Then, engage the coupling with both shafts and apply the specified clamping force, or insert the external spline end axially into the internal spline end until the end faces meet, and finally install the locking mechanism. After assembly, manually reciprocate the push rod 20 to check for any jamming or wobble throughout its full stroke, and ensure that the rotational clearance and axial movement are within the design limits.

[0068] During operation, the rotation angle and torque output by the servo motor are transmitted to the push rod 20 via a coupling or spline with zero or minimal backlash, enabling the push rod 20 to reciprocate or perform graded displacement along a predetermined trajectory. The coupling compensates for minor coaxial errors and assembly deviations, while the spline pair provides circumferential rigidity and repeatability. Because the connection is detachable, when it is necessary to replace the motor, adjust the stroke, or inspect the transmission end, separation and reset can be completed simply by releasing the clamp or removing the locking element, without disassembling the internal structures related to the seals.

[0069] To ensure long-term stability, the mating surfaces of connecting parts should be kept clean and smooth, and fasteners should be preloaded with appropriate force and have anti-loosening measures. If the coupling is elastic or diaphragm type, the allowable radial and angular compensation limits should be avoided. The spline mating surfaces should have appropriate surface hardness and lubrication to reduce wear and suppress meshing noise.

[0070] In this embodiment, since a detachable transmission connection of coupling or spline is used between the push rod 20 and the output shaft of the servo motor, the technical problems of difficulty in ensuring transmission coaxiality, large-scale disassembly required for maintenance and replacement, and difficulty in compensating for assembly errors in the prior art are effectively solved. Thus, the technical effects of stable and reliable power transmission path, quick assembly and disassembly and friendly maintenance, and the ability to accommodate assembly deviations while maintaining displacement control accuracy are achieved.

[0071] In some further embodiments, the first annular member 50 is made of a self-lubricating material, including one or more of polytetrafluoroethylene, polyetheretherketone, or oil-containing porous metal; the inner surface of the first annular member 50 is provided with annular or axial microgrooves for reducing friction.

[0072] Specifically: The connector 30 is designed as a replaceable interface assembly for connecting the external pipeline to the internal air extraction channel of the base 10 at the third port. The connector 30 body can be a short straight pipe or a joint with a shoulder, with a through flow channel 310 inside, and the outer surface configured with a corresponding connection structure according to the interface type. The third port is machined with port geometry and sealing seat surface that match the connection structure. The third sealing ring is arranged in the circumferential sealing cavity between the third port and the connector 30, preferably arranged at the step or conical surface near the flow channel 310 to form a sealing band under axial or radial pressure.

[0073] When using a threaded connection, first place the third sealing ring on the sealing seat surface of the third port, then screw the connector 30 axially until the end face presses against the sealing ring and reaches the predetermined tightening force. When using a quick-connect connection, first place the third sealing ring into the annular groove 160 of the third port, then push the connector 30 with the snap ring straight in until it is positioned. The snap ring automatically engages with the positioning groove and applies axial pressure to the sealing ring. When using a clamp connection, place the third sealing ring between the mating surfaces, insert the connector 30 into place, and then lock it circumferentially with the clamp. The radial clamping force of the clamp evenly presses the sealing ring through the outer shoulder. After assembly, check the coaxiality of the connector 30 and the third port, as well as the compression of the sealing ring, to ensure that the flow channel 310 is unobstructed and the seal is reliable.

[0074] In use, the external pipeline enters or exits the third port through connector 30. The third sealing ring is compressed axially or radially to form a continuous circumferential sealing band, blocking leakage channels at the interface. When the replaceable interface assembly changes the external pipe diameter, soft or hard pipe material, or connector standard, adaptation can be achieved simply by disconnecting the existing connection and replacing the connector 30 and sealing ring of the corresponding specification, without disassembling or modifying the base 10 body or internal channels.

[0075] To ensure long-term stability, the sealing surface of the third port should have appropriate dimensional and positional tolerances and surface roughness; the material of the third sealing ring should be compatible with the medium and cleaning agent, and have good resilience and resistance to permanent compression deformation; anti-loosening measures should be set for threaded or clamped parts, and the elasticity and engagement integrity of the snap ring should be checked regularly for quick-connect types; applying a small amount of compatible lubricant to the sealing surface and sealing ring before assembly can reduce assembly friction and reduce torsional deformation.

[0076] In this embodiment, since the connector 30 is designed as a replaceable interface component and is connected to the third port through at least one of threaded connection, quick-connect connection or clamp connection, and a third sealing ring is provided between the third port and the connector 30, the technical problems of interface standard incompatibility, the need to disassemble and modify the body for maintenance and replacement and the difficulty in controlling interface leakage in the prior art are effectively solved. Thus, the technical effects of rapid interface adaptation and disassembly, improved sealing reliability and reduced maintenance costs are achieved.

[0077] In some further embodiments, the base 10 is provided with a mounting structure for cooperating with a mounting interface of a pick-and-place machine frame or an ejector mechanism. The mounting structure includes at least one of threaded holes, countersunk holes, or locating pin holes, and is circumferentially distributed around the second port 130.

[0078] Specifically: A mounting structure is formed on the base 10 for mating with the mounting interface of the pick-and-place machine frame or ejection mechanism. This mounting structure is circumferentially distributed around the outer periphery of the second port 130 and includes at least one of threaded holes, countersunk holes, or locating pin holes. The threaded holes are used for direct connection to external fasteners; the openings of the countersunk holes have recessed cavities that match the heads of the countersunk fasteners, so that the fastener heads are flush with or slightly below the outer surface of the base 10; the locating pin holes are used for reference positioning and repeatable positioning during assembly. The surrounding arrangement ensures that the holes are symmetrically distributed relative to the second port 130, thereby applying a uniform circumferential clamping force and support reaction force to the flange area around the second port 130 after tightening, ensuring the overall flatness and coaxiality of the mating surfaces.

[0079] During installation, first bring the base 10 close to the mounting interface of the pick-and-place machine frame or ejector mechanism, aligning the second port 130 with the other interface. Initial alignment is achieved by engaging the locating pin hole with the locating hole of the other interface. Then, insert the countersunk fasteners sequentially or tighten them via the threaded holes. The countersunk through-holes prevent the fastener head from protruding above the outer surface, avoiding interference with the mating area or moving parts. The preferred tightening sequence is a circumferential diagonal alternation to gradually equalize the clamping force and suppress warping of the mating surfaces.

[0080] The mounting structure provides assembly reference and shear bearing path through locating pin holes, and forms axial clamping and surface pressure load path through threaded holes and countersunk through holes. The circumferentially distributed holes form a uniform surface pressure field in the circumferential area of ​​the second port 130 after tightening, so that the base 10 is stably attached to the mounting interface of the other party, which not only ensures positional accuracy but also restricts relative slippage, thereby creating stable boundary conditions for subsequent docking and sealing with the other party's device.

[0081] Each hole should be machined with the center of the second port 130 as the geometric reference, controlling the hole spacing error and circumferential distribution error to ensure balanced circumferential clamping force. The interference or clearance grade between the locating pin hole and the mating pin should match the installation accuracy requirements; the countersunk cavity surface of the countersunk through hole should fully fit with the fastener head to avoid local indentation and stress concentration. During assembly, the hole opening and mating surface should be cleaned, and the tightening torque and lubrication status should be consistent to obtain repeatable preload force.

[0082] In this embodiment, since threaded holes, countersunk through holes, or locating pin holes that mate with the installation interface are provided circumferentially around the second port 130 on the base 10, and reference positioning and uniform clamping are achieved accordingly, the technical problems of difficult repeated installation alignment, uneven distribution of clamping force leading to warping of the mating surface, and easy loosening under vibration environment in the prior art are effectively solved. Thus, the technical effects of rapid assembly alignment and repeated positioning, uniform force and stable fit of the mating area, and anti-loosening and convenient maintenance during long-term operation are achieved.

[0083] The above description in this specification is merely illustrative of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined in the claims, all of which shall fall within the protection scope of this invention.

Claims

1. A lifting mechanism for a pick-and-place machine, used in conjunction with an ejection mechanism in the pick-and-place machine, characterized in that, include: A base, wherein a through groove is formed along a first direction, and the two ends of the through groove extend to the surface of the base to form a first port and a second port, respectively; The base has a filling groove at the first port along the first direction, and the inner wall of the filling groove is provided with an assembly groove on the side away from the first port. The inner wall of the assembly groove is provided with an annular groove. The base is also provided with an air extraction groove, which is connected to the through groove and extends to the second port side, and forms a docking groove at the second port. The docking groove is used to seal and dock with the connection port of the ejection mechanism. A push rod is inserted into the through groove through the first port, and both ends of the push rod extend beyond the base. A gap is left between the outer surface of the portion of the push rod located in the through groove and the inner wall of the through groove. A connector is provided at the third port, which is formed by the extension of the end of the suction groove away from the through groove to the surface of the base; the connector has a through flow channel inside, one end of which is connected to the suction groove, and the other end is used to connect to an external vacuum source. The packing material is disposed in the packing groove to fill the gap between the outer surface of the push rod and the inner wall of the packing groove; A first annular component is disposed within the assembly groove, through which the push rod passes; the shape and size of the outer ring of the cross-section of the first annular component are the same as the shape and size of the cross-section of the assembly groove, and the inner ring of the cross-section of the first annular component is circular, with the corresponding diameter being equal to the diameter of the push rod; A first sealing ring is disposed at the annular groove. The inner side of the first sealing ring abuts against the outer surface of the push rod to seal the through groove. Furthermore, the first sealing ring is located between the packing and the first annular member. The side of the first sealing ring away from the first annular member abuts against the packing, and the side of the first sealing ring away from the packing abuts against the first annular member to restrict the axial displacement of the first annular member. The connector, the air extraction groove, and the docking groove form an air extraction channel for extracting air from the inside of the ejection mechanism.

2. The lifting mechanism according to claim 1, characterized in that, The docking groove forms a conical sealing surface or a stepped sealing surface on the side away from the second port. Furthermore, a second annular member is provided in the docking groove. The outer surface of the second annular member is in contact with the inner wall of the docking groove. The inner circle of the cross-section of the second annular member is circular and the corresponding diameter is equal to the diameter of the top rod. Several through air passages are provided axially inside the second annular member. Each air passage is spaced apart from each other and arranged in a ring array around the center of the second annular member. The air passages are connected to the suction groove and the docking groove.

3. The lifting mechanism according to claim 2, characterized in that, The base is a cylindrical structure, and the first direction is the extension direction of the cylindrical structure; an annular step is constructed on the outer periphery of the base near the second port, and a second sealing ring is fitted at the connection between the base and the annular step to achieve circumferential sealing when the lifting mechanism and the ejection mechanism are connected.

4. The lifting mechanism according to claim 1, characterized in that, It includes an adapter, which is disposed at one end of the top rod extending from the second port to the outside of the base, and the adapter is detachably connected to the top rod.

5. The lifting mechanism according to claim 1, characterized in that, The top rod has an annular flange extending from the second port to the periphery of the base. The annular flange has a through-hole along the axial direction of the top rod. The through-hole is configured such that, in the initial state of the lifting mechanism, the side of the annular flange facing the base is in contact with the surface of the base at the second port, and the through-hole communicates with the docking groove.

6. The lifting mechanism according to claim 1, characterized in that, The push rod is detachably connected to the output shaft of the servo motor via a coupling or spline.

7. The lifting mechanism according to claim 1, characterized in that, The first annular component is made of a self-lubricating material, which includes one or more of polytetrafluoroethylene, polyetheretherketone, or oil-containing porous metal; the inner surface of the first annular component is provided with annular or axial microgrooves for reducing friction.

8. The lifting mechanism according to claim 1, characterized in that, The base is provided with a mounting structure for cooperating with the mounting interface of the pick-and-place machine frame or ejection mechanism. The mounting structure includes at least one of threaded holes, countersunk holes or locating pin holes, and is distributed circumferentially around the second port.

9. The lifting mechanism according to claim 2, characterized in that, The cone angle of the conical sealing surface of the docking groove is 60° to 100°, and the cone angle is the included angle between the two generatrices of the conical sealing surface.

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