A traceless vacuum chuck

Abstract

This application discloses a non-marking vacuum suction cup, including a traditional vacuum suction cup assembly and an embeddable PEEK adsorption accessory. The traditional vacuum suction cup assembly is composed of a quick connector, a gasket, a connecting rod, a hexagonal nut, a spring, a shaft, a suction cup screw, a flat washer, and a suction cup body assembled in sequence. The inner wall of the suction cup body is provided with an annular sealing groove and is adapted to a fluororubber O-ring. The embeddable PEEK adsorption accessory has an annular structure with a groove with anti-slip texture on the inner wall. It can be detachably embedded in the annular protrusion of the suction cup body through the groove, and its adsorption surface protrudes 0.5-1mm beyond the adsorption surface of the suction cup body and is provided with rounded corners. This utility model has the characteristics of non-marking adsorption, high temperature resistance, high wear resistance, strong buffering and excellent sealing. It can reduce the defect rate of precision workpieces and equipment maintenance costs, and is suitable for handling precision workpieces such as mobile phone screens, LCD screens, and optical lenses.

Description

Technical Field

[0001] This utility model relates to the field of vacuum adsorption technology, specifically to a non-marking vacuum chuck for non-destructive handling of precision workpieces. It is particularly suitable for adsorption and handling of high-gloss, high-precision, and easily damaged workpieces such as mobile phone OLED screens, LCD screens, quartz optical lenses, ceramic substrates, and silicon wafers. It can be widely used in precision manufacturing fields such as electronic manufacturing (e.g., mobile phone assembly), optical instruments (e.g., lens production), and semiconductors (e.g., chip packaging). It is adaptable to normal temperature, medium-high temperature (≤260℃), and slightly corrosive environments (e.g., isopropanol volatilization environments). Background Technology

[0002] Vacuum chucks are core components in industrial automation production for non-contact (or low-damage contact) workpiece handling. Their working principle is as follows: air is extracted from the inside of the chuck by a vacuum generator or vacuum pump, creating a negative pressure environment inside the chuck that is lower than the external atmospheric pressure. The pressure difference generates an adsorption force to grip the workpiece. After the workpiece is transported to the target station, normal pressure air is introduced into the chuck to restore the air pressure, and the adsorption force disappears, completing the workpiece detachment.

[0003] In existing technologies, a typical vacuum chuck structure consists of a quick connector, gasket, connecting rod, hexagonal nut, spring, shaft, chuck screw, flat washer, and chuck body. However, it has the following key defects in precision workpiece handling scenarios, and these defects directly affect production efficiency and product quality: 1. High risk of workpiece surface damage: The suction cup body is mostly made of elastic materials such as nitrile rubber and silicone rubber. When it comes into direct contact with high-precision workpieces (such as mobile phone OLED screens), the deformation and friction during the adsorption process can easily leave ring-shaped indentations. In addition, the surface roughness of the rubber is relatively high (usually Ra≥0.1μm), which can easily produce micron-level scratches, resulting in a workpiece defect rate as high as 5%-10%. 2. Poor material performance adaptability: Traditional rubber materials have limited high temperature resistance (silicone rubber has a maximum continuous temperature resistance of about 200℃). Under medium and high temperature conditions (such as lens handling after drying), they are prone to aging and softening, with an adsorption capacity attenuation rate of more than 30% (3-6 months of use); and they have weak corrosion resistance, and are prone to cracking in environments with volatile cleaning agents such as isopropanol, further shortening their service life. 3. Insufficient buffering and sealing design: Some vacuum suction cups use springs made of ordinary carbon steel, which are prone to corrosion and whose buffering parameters (wire diameter, compression amount) are not adapted to precision workpieces. When in contact, the workpiece is easily deformed due to excessive impact force. At the same time, the connection between the suction cup body and accessories (if any) lacks a special sealing structure, and the negative pressure leakage rate reaches 2-3 kPa / min, which can easily cause the workpiece to slide or fall off during handling. 4. Cumbersome maintenance and operation: Traditional suction cups and accessories (if any) are mostly fixedly connected. When replacing them, the entire suction cup assembly needs to be disassembled. Each operation takes 15-30 minutes, resulting in significant equipment downtime losses. Furthermore, frequent replacement of rubber materials leads to annual maintenance costs accounting for 15%-20% of the total equipment cost.

[0004] To address the aforementioned shortcomings, there is an urgent need to develop a vacuum chuck that combines "mark-free adsorption, high-performance materials, precise cushioning, reliable sealing, and convenient maintenance" to meet the core requirements of precision manufacturing for non-destructive handling of workpieces. Utility Model Content

[0005] The purpose of this invention is to overcome four major defects of existing vacuum suction cups: First, by using an embeddable PEEK adsorption attachment, complete isolation between the workpiece and the rubber material is achieved, solving the problem of "residual marks and micro-scratches"; second, by utilizing the high temperature resistance and high wear resistance of PEEK material, the service life of the suction cup is extended; third, by optimizing the parameters of the 304 stainless steel compression spring, the contact buffering performance is improved, preventing workpiece deformation; fourth, by using the design of the annular sealing groove on the inner wall of the suction cup body and the fluororubber O-ring, the negative pressure sealing performance is enhanced, ensuring adsorption stability; ultimately reducing the defect rate of precision workpieces and equipment maintenance costs.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A non-marking vacuum suction cup includes a traditional vacuum suction cup assembly. The assembly comprises a quick connector, a gasket, a connecting rod, a hexagonal nut, a spring, a shaft, a suction cup screw, a flat washer, and a suction cup body. The quick connector is fixed to one end of the connecting rod. The gasket is fitted at the connection between the connecting rod and the quick connector. The hexagonal nut and spring are sequentially fitted onto the middle of the connecting rod. The shaft is fixedly connected to the other end of the connecting rod. The suction cup body is fixed to the free end of the shaft by the suction cup screw and the flat washer. The assembly also includes an embeddable PEEK adsorption attachment. The embeddable PEEK adsorption attachment has a ring-shaped structure with a groove on its inner wall that fits the outer wall of the suction cup body. The embeddable PEEK adsorption attachment is detachably embedded into the adsorption end of the suction cup body through the groove, and the adsorption surface of the embeddable PEEK adsorption attachment protrudes 0.5-1mm beyond the adsorption surface of the suction cup body.

[0007] In a preferred embodiment, the embeddable PEEK adsorption attachment is made of polyetheretherketone resin, with a continuous operating temperature range of 250-260℃, an instantaneous temperature tolerance of not less than 300℃, and a Shore hardness of D85-D90.

[0008] In a preferred embodiment, the groove depth of the inner wall of the embeddable PEEK adsorption accessory is 2-3mm, and the inner wall of the groove is provided with a cross-grid anti-slip pattern. The grid spacing of the anti-slip pattern is 0.3-0.5mm. By increasing the friction between the groove and the suction cup body, axial or circumferential displacement of the embeddable PEEK adsorption accessory during adsorption is avoided.

[0009] In a preferred embodiment, the wall thickness of the embeddable PEEK adsorption attachment is 1-1.5 mm, and its adsorption surface is mirror-polished with a surface roughness Ra≤0.02 μm.

[0010] In a preferred embodiment, the outer wall of the suction end of the suction cup body is provided with an annular protrusion that matches the slot. The height of the annular protrusion is consistent with the depth of the slot, and the roughness Ra of the outer wall of the annular protrusion is ≤0.8μm. The embedded PEEK adsorption accessory and the suction cup body are installed through the cooperation of the "annular protrusion-slot".

[0011] In a preferred embodiment, the edge of the adsorption surface of the embeddable PEEK adsorption attachment is provided with rounded corners.

[0012] In a preferred embodiment, the spring is a compression spring made of 304 stainless steel, with a wire diameter of 1.0-1.5mm, a free length of 12-18mm, and a working compression of 3-5mm.

[0013] In a preferred embodiment, the suction cup body is made of silicone rubber with a Shore A hardness of 60-70. The inner wall of its suction end is provided with an annular sealing groove, and an O-ring made of fluororubber is fitted in the annular sealing groove. The cross-sectional diameter of the O-ring is 1-1.2mm, which is used to enhance the negative pressure sealing performance after the suction cup body and the embeddable PEEK suction accessory are installed.

[0014] Due to the application of the above technical solution, the beneficial effects of this application compared with the prior art are as follows: 1. Seamless adsorption ensures the quality of precision workpieces: The PEEK adsorption attachment comes into direct contact with the workpiece, isolating it from the silicone rubber material. Combined with a mirror-like adsorption surface (Ra≤0.02μm) and rounded corners, the defect rate of precision workpieces is reduced from 5%-10% to below 0.5%, making it especially suitable for high-gloss workpieces such as mobile phone OLED screens and optical lenses. The low coefficient of friction and high hardness of PEEK material prevents residue or scratches during the adsorption process, meeting the high surface quality standards of the electronics and optics fields.

[0015] 2. High-performance materials extend service life: The high temperature resistance (250-260℃), high wear resistance (wear rate 1 / 20 of silicone rubber), and strong corrosion resistance of PEEK material extend the overall service life of the suction cup from 3-6 months to 15-20 months, reducing the frequency of consumable replacement. 304 stainless steel springs are rust-resistant and have stable elasticity at medium and high temperatures, avoiding the frequent replacement of traditional carbon steel springs (traditional springs have a lifespan of 6-8 months, while the springs of this invention have a lifespan of more than 24 months).

[0016] 3. Precise cushioning to protect workpieces and equipment: The wire diameter (1.0-1.5mm), free length (12-18mm), and working compression amount (3-5mm) of the 304 stainless steel compression spring are precisely matched to the load-bearing requirements of precision workpieces, with a contact impact force ≤5N, avoiding deformation or breakage of brittle workpieces such as mobile phone screens and ceramic substrates. The spring's cushioning effect reduces rigid collisions between the suction cup assembly and the workpiece, extending the service life of the robotic arm drive equipment.

[0017] 4. Multi-layer sealing enhances adsorption stability: The annular sealing groove on the inner wall of the suction cup body and the fluororubber O-ring form the first seal, and the tight embedding of the PEEK adsorption attachment and the annular protrusion forms the second seal. The double seal reduces the negative pressure leakage rate from 2-3 kPa / min to below 0.5 kPa / min, preventing the workpiece from sliding or falling off during handling and improving production safety. The fluororubber material of the O-rings is suitable for medium-temperature and corrosive environments, ensuring stable sealing performance under different working conditions.

[0018] 5. Easy maintenance, reducing overall costs: The PEEK suction attachment can be detachably installed via a slot, eliminating the need to disassemble the entire suction cup assembly. A single replacement takes ≤30 seconds, which is more than 90% shorter than existing technologies (15-30 minutes), reducing equipment downtime losses. Extended service life and improved maintenance efficiency reduce the annual maintenance cost per unit from 1,200 yuan to below 300 yuan, thereby lowering enterprise production costs. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Appendix Figure 1 This is a schematic diagram of the non-marking vacuum suction cup of this utility model; The components include: 1. Quick connector; 2. Gasket; 3. Connecting rod; 4. Hex nut; 5. Spring; 6. Shaft; 7. Suction cup screw; 8. Flat washer; 9. Suction cup body; 10. Embeddable PEEK suction attachment. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0022] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0024] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0025] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Example 1 Appendix Figure 1 The present invention provides a traceless vacuum suction cup, comprising two core parts: a traditional vacuum suction cup assembly and an embeddable PEEK adsorption attachment 10. The structure, material, parameters, and connection relationships of each part are as follows: I. Traditional vacuum suction cup assembly.

[0028] This component forms the basic support structure for vacuum adsorption, undertaking the functions of negative pressure conduction, buffering and shock absorption, and sealing enhancement. Specifically, it includes a quick connector 1, a gasket 2, a connecting rod 3, a hexagonal nut 4, a spring 5, a shaft 6, a suction cup screw 7, a flat washer 8, the suction cup body 9, and a fluororubber O-ring. The detailed design of each component is as follows: Quick connector 1: Made of H62 brass with a nickel-plated surface (plating thickness 5-8μm) to improve corrosion resistance. It is fixedly connected to one end of the connecting rod 3 via an M5 thread. It has an internal nitrile rubber sealing ring for docking with the PU air hose (inner diameter 4-6mm) of external vacuum equipment (such as a vacuum generator) to achieve air extraction and inflation inside the suction cup, ensuring no negative pressure leakage at the air hose connection. Gasket 2: Made of nitrile rubber (NBR) with Shore A hardness of 50-55, its inner diameter is compatible with the outer diameter of the connecting rod 3 (error ±0.1mm). It is fitted onto the threaded connection between the connecting rod 3 and the quick connector 1 to fill the thread gap and further enhance the airtightness of this part. Connecting rod 3: Made of 304 stainless steel, with a diameter of 6-8mm and a length of 50-80mm, and an M8 external thread machined in the middle (for fitting hexagonal nut 4); the surface is polished (Ra≤0.8μm) to prevent rust from affecting the adjustment flexibility of hexagonal nut 4; Hex nut 4: Made of 304 stainless steel, its model matches the M8 external thread of the connecting rod 3, and is fitted onto the threaded section in the middle of the connecting rod 3; by rotating the hex nut 4, the axial length of the entire suction cup assembly can be adjusted to adapt to the handling needs of workpieces of different heights (such as the 30-50mm height range when assembling mobile phone screens). Spring 5: A compression spring 5 made of 304 stainless steel, with a wire diameter of 1.0-1.5mm, a free length of 12-18mm, and a working compression of 3-5mm; it is sleeved in the middle of the connecting rod 3, located between the hexagonal nut 4 and the shaft 6; the 304 stainless steel material can prevent rust, and the precise wire diameter and compression parameters can buffer the impact force when the suction cup contacts the workpiece (impact force ≤5N), preventing the deformation of precision workpieces (such as optical lenses) due to rigid collisions; Shaft 6: Made of 304 stainless steel, with a diameter of 8-10mm and a length of 15-20mm; one end is fixedly connected to the other end of the connecting rod 3 by argon arc welding (weld height 3-4mm), and the weld is polished to avoid stress concentration; the other end is machined with an M4 internal thread hole (depth 8-10mm) for fixing the suction cup body 9 by suction cup screw 7. Suction cup screw 7 and flat washer 8: The suction cup screw 7 is a Phillips head pan screw made of 304 stainless steel, model M4×12, to ensure sufficient connection strength; the flat washer 8 is also made of 304 stainless steel, with an outer diameter of 10mm, an inner diameter of 4.2mm, and a thickness of 1mm. It is fitted between the suction cup screw 7 and the suction cup body 9 to distribute the pressure when the screw is tightened and to prevent the silicone rubber suction cup body 9 from being crushed. Suction cup body 9 and fluororubber O-ring: The suction cup body 9 is made of silicone rubber with a Shore A hardness of 60-70, ensuring sufficient elasticity to fit the workpiece surface while avoiding damage due to excessive hardness. Its adsorption end has a bowl-shaped structure (diameter 15-25mm, depth 5-8mm), with an annular protrusion machined on the outer wall of the end. The height of the protrusion matches the depth of the slot of the embedded PEEK adsorption accessory 10 (2-3mm), and the outer wall roughness Ra≤0.8μm ensures precise fit with the slot. The inner wall of the adsorption end of the suction cup body 9 is machined with an annular sealing groove (width 1.2mm, depth 1mm), in which a fluororubber O-ring with a cross-sectional diameter of 1-1.2mm is fitted. This enhances the negative pressure sealing performance after the suction cup body 9 and the embedded PEEK adsorption accessory 10 are installed, reducing the leakage rate.

[0029] II. Embeddable PEEK adsorption attachment 10.

[0030] This accessory is the core functional component of the "mark-free adsorption" system, and it comes into direct contact with the workpiece. Its specific parameters and structure are as follows: Material and performance parameters: Polyetheretherketone (PEEK) resin is used. This material has excellent high temperature resistance (continuous working temperature 250-260℃, instantaneous temperature resistance ≥300℃), high wear resistance (wear rate is only 1 / 20 of silicone rubber), strong corrosion resistance (resistant to industrial reagents such as alcohol and isopropanol), and low coefficient of friction (static coefficient of friction 0.3-0.4); Shore hardness is D85-D90, which ensures structural rigidity to avoid deformation, while avoiding excessive hardness that could cause scratches on the workpiece. Overall structure and connection method: It is an annular structure adapted to the adsorption end of the suction cup body 9. The inner diameter is consistent with the outer diameter of the end of the suction cup body 9 (error ±0.1mm). It can be detachably installed by the inner wall groove and the annular protrusion of the suction cup body 9. The groove depth is 2-3mm, and the inner wall is processed with cross-grid anti-slip texture with a grid spacing of 0.3-0.5mm. By increasing the friction between the groove and the annular protrusion, the axial displacement (displacement ≤0.1mm) or circumferential rotation of the embedded PEEK adsorption attachment 10 during adsorption is prevented. Adsorption surface design: The adsorption surface protrudes 0.5-1mm from the adsorption surface of the suction cup body 9, ensuring that the embedded PEEK adsorption attachment 10 contacts the workpiece first during adsorption, completely isolating the silicone rubber material of the suction cup body 9; the adsorption surface is mirror polished, with a surface roughness Ra≤0.02μm, avoiding micro-scratches when in contact with the workpiece; the edges of the adsorption surface are rounded with a chamfer radius of 0.1-0.2mm, further reducing the risk of rigid scratches during initial contact; at the same time, the wall thickness of the embedded PEEK adsorption attachment 10 is 1-1.5mm, reducing material costs and overall weight while ensuring structural strength (able to withstand 10-15N adsorption force without deformation).

[0031] III. Work Process.

[0032] Taking the room temperature handling of a mobile phone OLED screen (thickness 0.5mm, surface roughness Ra≤0.01μm) as an example, the working process of this utility model is described in detail: 1. Component assembly stage: Embed the fluororubber O-ring into the annular sealing groove on the inner wall of the suction cup body 9 to ensure that the O-ring fits the groove wall completely without twisting or gaps. Align the slot of the embedded PEEK adsorption accessory 10 with the annular protrusion of the suction cup body 9, and apply an axial force of 5-8N to complete the insertion. At this time, the adsorption surface of the embedded PEEK adsorption accessory 10 protrudes 0.8mm from the adsorption surface of the suction cup body 9, and the anti-slip texture fits tightly with the annular protrusion. The suction cup body 9 is fixed to the internal threaded hole of the shaft 6 using the suction cup screw 7 and the flat washer 8, with the tightening torque controlled between 1.5-2. To avoid excessive tightness that could crack the suction cup body 9; Connect quick connector 1 to the PU hose of the external vacuum equipment, rotate hex nut 4 to adjust the overall length of the suction cup assembly to 40mm (to match the height of mobile phone screen handling), and spring 5 is in a free state (length 15mm).

[0033] 2. Workpiece contact stage: The robotic arm drives the suction cup assembly to move above the OLED screen and slowly descends at a speed of 5mm / s; The adsorption surface of the embedded PEEK adsorption attachment 10 first contacts the screen surface, and then continues to descend, compressing the spring 5 by 3mm to buffer the contact impact force (impact force ≤3N) and prevent the screen from deforming due to rigid collision.

[0034] 3. Negative pressure adsorption stage: Turn on the vacuum pump and use the quick connector 1 to extract the air from the sealed space formed by the suction cup body 9 and the embedded PEEK adsorption accessory 10, so that the vacuum degree in the space reaches -90 to -95 kPa within 3-5 seconds. Under negative pressure, the fluororubber O-ring fits tightly against the inner wall of the embedded PEEK adsorption accessory 10, with a negative pressure leakage rate of ≤0.5kPa / min, ensuring stable adsorption force (adsorption force of approximately 12N, meeting the requirements for screen handling). At this time, the mirror adsorption surface of the embedded PEEK adsorption accessory 10 contacts the screen without leaving any residue.

[0035] 4. Workpiece handling stage: The robotic arm moves the suction cup and screen to the assembly station at a speed of 100mm / s. During the movement, the spring 5 can offset the vibration displacement of ±0.5mm to prevent the screen from sliding. The anti-slip texture of the embedded PEEK adsorption attachment 10 ensures that there is no relative displacement between it and the suction cup body 9.

[0036] 5. Workpiece separation stage: Turn off the vacuum pump and introduce atmospheric pressure air into the sealed space through quick connector 1. Within 1-2 seconds, the air pressure will return to atmospheric pressure (101 kPa), and the adsorption force will disappear. The robotic arm lifts the suction cup assembly, and the screen smoothly detaches from the embedded PEEK adsorption attachment 10, completing the transfer. If the embedded PEEK adsorption attachment 10 needs to be replaced, only an axial pulling force of 8-10N is needed to pull out the old attachment and insert the new attachment. The replacement time is ≤30 seconds.

[0037] Example 2 To further verify the technical feasibility and advantages of this utility model, the following embodiments were designed based on three typical application scenarios in precision manufacturing (normal temperature high-gloss workpieces, medium temperature precision components, and workpieces in corrosive environments), and the improvement effect was verified by comparing experimental data.

[0038] 1. Normal temperature conditions (25℃) - Handling mobile phone OLED screens.

[0039] Application scenario: In mobile phone assembly lines, non-destructive handling of 0.5mm thick OLED screens (surface roughness Ra≤0.01μm) is required, with no indentations or scratches, and a single handling time of ≤10 seconds.

[0040] Component parameter selection:

[0041] Application effect comparison (experimental sample size: 1000 OLED screens):

[0042] Experimental results: This invention uses the mirror-like adsorption surface (Ra=0.01μm) of the PEEK attachment to contact the OLED screen, along with a 0.15mm rounded corner, completely eliminating the annular indentation of traditional rubber suction cups; the 3mm compression of the 304 stainless steel spring keeps the contact impact force within 3N, preventing screen deformation; the sealing effect of the fluororubber O-ring stabilizes the negative pressure at -92kPa±0.5kPa, ensuring no slippage during handling.

[0043] 2. Medium temperature conditions (200℃) - Quartz optical lens handling.

[0044] Application scenario: In the optical lens production line, the handling of quartz lenses (50mm in diameter, 3mm in thickness, and surface roughness Ra≤0.005μm) dried at 200℃ requires high temperature resistance and no surface damage.

[0045] Component parameter selection:

[0046] Comparison of application effects (experimental conditions: continuous handling test in a 200℃ constant temperature chamber):

[0047] Experimental results show that the PEEK accessory maintains structural stability at 200℃ (thermal deformation ≤0.02mm), avoiding material detachment and scratches caused by high-temperature aging of traditional fluororubber suction cups; the 304 stainless steel spring has an elastic coefficient change rate of only 4.2% at 200℃, ensuring stable cushioning performance; the double-layer sealing structure (O-ring + slot fit) controls the negative pressure leakage rate to within 0.5kPa / min at high temperatures, meeting the high-precision handling requirements of optical lenses.

[0048] 3. Corrosive environment (isopropanol volatilization) - ceramic substrate handling.

[0049] Application scenario: In semiconductor packaging production lines, the handling of ceramic substrates (50×50mm in size, with copper-clad circuitry on the surface) cleaned with isopropyl alcohol requires resistance to chemical corrosion and no residual marks.

[0050] Component parameter selection:

[0051] Comparison of application effects (experimental environment: sealed chamber with 5% isopropanol concentration):

[0052] Experimental results show that PEEK material is resistant to isopropanol corrosion (mass change rate ≤0.1% after 30-day immersion), avoiding the swelling and residue of traditional rubber suction cups; the alcohol-resistant fluororubber O-ring has a swelling rate of only 1.8% in the isopropanol environment, ensuring long-term sealing performance; the combination of anti-slip texture and annular protrusions ensures that PEEK accessories do not loosen in corrosive environments, improving handling stability to 99.9%.

[0053] Summary chart of experimental data:

[0054] Summary of improvements to core indicators under three types of operating conditions:

[0055] (Note: "-" indicates a decrease, and "+" indicates an increase. All data are from statistical results of more than 1,000 repeated experiments.)

[0056] As can be seen from the above embodiments, the technical features of this utility model (embeddable PEEK accessories, 304 stainless steel springs, double-layer sealing structure, etc.) can significantly improve the handling quality of precision workpieces and the operating efficiency of equipment under different working conditions, and completely solve the core defects of the prior art.

[0057] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A non-marking vacuum suction cup, comprising a conventional vacuum suction cup assembly, wherein the conventional vacuum suction cup assembly includes a quick connector, a washer, a connecting rod, a hexagonal nut, a spring, a shaft, a suction cup screw, a flat washer, and a suction cup body; the quick connector is fixed to one end of the connecting rod; the washer is sleeved at the connection between the connecting rod and the quick connector; the hexagonal nut and the spring are sequentially sleeved on the middle of the connecting rod; the shaft is fixedly connected to the other end of the connecting rod; and the suction cup body is fixed to the free end of the shaft by the suction cup screw and the flat washer, characterized in that: It also includes an embeddable PEEK adsorption attachment; the embeddable PEEK adsorption attachment has a ring structure, and its inner wall is provided with a slot that is adapted to the outer wall of the suction cup body. The embeddable PEEK adsorption attachment can be detachably embedded in the adsorption end of the suction cup body through the slot, and the adsorption surface of the embeddable PEEK adsorption attachment protrudes 0.5-1mm from the adsorption surface of the suction cup body.

2. A markless vacuum chuck according to claim 1, characterized in that: The embeddable PEEK adsorption attachment is made of polyetheretherketone resin, with a continuous operating temperature range of 250-260℃, an instantaneous temperature tolerance of not less than 300℃, and a Shore hardness of D85-D90.

3. The non-marking vacuum suction cup according to claim 1, characterized in that: The groove depth of the inner wall of the embeddable PEEK adsorption attachment is 2-3mm, and the inner wall of the groove is provided with a cross-grid anti-slip pattern. The grid spacing of the anti-slip pattern is 0.3-0.5mm. By increasing the friction between the groove and the suction cup body, the axial or circumferential displacement of the embeddable PEEK adsorption attachment during the adsorption process is avoided.

4. A mark-free vacuum chuck according to any one of claims 1-3, characterized in that: The wall thickness of the embeddable PEEK adsorption attachment is 1-1.5 mm, and its adsorption surface is mirror polished with a surface roughness Ra≤0.02 μm.

5. A vacuum chuck according to claim 4, characterized in that: The outer wall of the suction end of the suction cup body is provided with an annular protrusion that matches the slot. The height of the annular protrusion is the same as the depth of the slot, and the roughness Ra of the outer wall of the annular protrusion is ≤0.8μm. The embedded PEEK suction attachment and the suction cup body can be installed through the cooperation of the "annular protrusion-slot".

6. A vacuum chuck according to claim 4, characterized in that: The edge of the adsorption surface of the embeddable PEEK adsorption attachment is rounded and chamfered.

7. A vacuum chuck according to claim 4, characterized in that: The spring is a compression spring made of 304 stainless steel, with a wire diameter of 1.0-1.5mm, a free length of 12-18mm, and a working compression of 3-5mm.

8. A traceless vacuum suction cup according to claim 4, characterized in that: The suction cup body is made of silicone rubber with a Shore A hardness of 60-70. The inner wall of its suction end is provided with an annular sealing groove. An O-ring made of fluororubber is fitted in the annular sealing groove. The cross-sectional diameter of the O-ring is 1-1.2mm, which is used to enhance the negative pressure sealing performance after the suction cup body and the embeddable PEEK suction accessory are installed.

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