RFID electronic tag packaging structure and packaging method

Abstract

The invention discloses an RFID electronic tag packaging structure and packaging method, a chip and an antenna of an RFID electronic tag are installed between a metal lower shell and a metal upper shell, and a PEEK material is filled in a gap between the metal upper shell and the metal lower shell to form a PEEK filling inner core wrapping the chip and the antenna. The sealing contact surfaces of the lower metal shell, the upper metal shell and the PEEK filling inner core are subjected to finish turning, the outer side of the upper metal shell is sequentially sleeved with a sealing gasket and a PEEK pressing plate in a hot pressing mode, a metal pressing ring is subjected to hot pressing to the outer side of the lower metal shell, the PEEK pressing plate is pressed through the metal pressing ring so that the sealing gasket can cover the sealing contact surfaces in a sealing mode, and finally the joint of the metal pressing ring and the lower metal shell is welded. Signals communicate with the antenna of the RFID electronic tag through the annular area between the metal lower shell and the metal upper shell, the packaging structure can fully protect the RFID electronic tag in a high-temperature environment, and a chip and the antenna of the RFID electronic tag can be used under the working conditions of high temperature and high pressure for a long time.

Description

Technical Field

[0001] The present invention relates to the technical field of RFID packaging technology with ultra-long detection distance, in particular to an RFID electronic tag packaging structure and a packaging method. Background Art

[0002] The oil mining industry relies on RFID technology to ensure mining safety, improve operational efficiency, extend the life cycle of equipment assets, and reduce non-productive downtime. RFID provides a complete set of intelligent management solutions for basic oil mining management. The installation method of electronic tags in the oil mining industry is as follows: first, a hole is drilled in the drill pipe or well casing, and the inner diameter of the hole needs to be 0.1 - 0.3 mm smaller than the outer diameter of the packaged electronic tag, and then the electronic tag is pressed in with a hydraulic press.

[0003] Most traditional RFID electronic tag packages use ceramics, ordinary plastics, or epoxy adhesives, etc. At a depth of several thousand meters underground, the temperature can reach 200°C, and the external liquid pressure can reach 150 Mpa. As long as there is a slight liquid leakage in the electronic components inside the electronic tag, it will affect its performance and cause failure. Traditional packaging solutions cannot meet the sealing requirements of harsh downhole working conditions. If fully metal packaging is used, it will shield the signal of the electronic tag, resulting in signal transmission failure. Summary of the Invention

[0004] In order to overcome the above defects, the present invention provides an RFID electronic tag packaging structure and a packaging method. The RFID electronic tag packaging structure formed by using this RFID electronic tag packaging method has the characteristics of high temperature resistance, high pressure resistance, and corrosion resistance, and can meet the usage requirements in harsh environments.

[0005] The technical solution adopted by the present invention to solve its technical problems: an RFID electronic tag packaging structure, including a metal shell, a PEEK filling inner core, a PEEK pressing plate, and a sealing gasket. An opening structure is formed at the upper end of the metal shell. The PEEK filling inner core is fixedly filled in the metal shell. A chip accommodating cavity and an antenna accommodating cavity for stopping and accommodating the chip and antenna of the RFID electronic tag are formed in the PEEK filling inner core. The sealing gasket covers the upper side surface of the PEEK filling inner core. The PEEK pressing plate is fixedly installed inside the opening end of the metal shell, and the PEEK pressing plate tightly presses on the upper side surface of the sealing gasket so that the sealing gasket is in sealing contact with the inner side wall of the metal shell and the upper side surface of the PEEK filling inner core. The signal can communicate with the antenna of the RFID electronic tag through the opening structure of the metal shell and through the PEEK pressing plate and the sealing gasket.

[0006] As a further improvement of the present invention, the metal housing includes a metal lower shell, a metal upper shell and a metal pressing ring. The metal lower shell is a barrel structure with an open upper end. The metal upper cover can be fixedly connected to the upper end surface of the PEEK-filled inner core to form an integral structure, and the metal upper cover covers above the chip and antenna of the RFID electronic tag. The outer diameter of the metal upper shell is smaller than the inner diameter of the upper end opening of the metal lower shell. The sealing gasket is sleeved outside the metal upper shell, and the sealing gasket completely covers the annular upper surface of the PEEK-filled inner core located between the metal lower shell and the metal upper shell. The PEEK pressing plate is tightly sleeved outside the metal upper shell and presses the upper side surface of the sealing gasket. The metal pressing ring can be fixedly installed on the metal lower shell and presses the upper end of the PEEK pressing plate.

[0007] As a further improvement of the present invention, a circumferential outer convex flange is formed on the outer circumferential side wall at the lower end of the metal upper shell. The sealing gasket covers the upper end surface of the flange on the outside of the metal upper shell and the upper end surface of the side wall of the metal lower shell. The lower end of the PEEK pressing plate completely covers the upper side surface of the sealing gasket.

[0008] As a further improvement of the present invention, a circumferential outer convex step is formed on the outer circumferential side wall of the PEEK pressing plate. A radially inwardly retracted retaining ring is formed on the inner side wall at the upper end of the metal pressing ring. The retaining ring of the metal pressing ring abuts tightly against the circumferential outer convex step of the PEEK pressing plate.

[0009] As a further improvement of the present invention, the circumferential outer convex step of the PEEK pressing plate is transitionally connected to the outer circumferential side wall of the PEEK pressing plate above it through a first inclined surface. The inner side wall of the retaining ring of the metal pressing ring forms a second inclined surface matching the first inclined surface, and the second inclined surface closely adheres to the surface of the first inclined surface.

[0010] As a further improvement of the present invention, the metal pressing ring is tightly sleeved outside the metal lower shell, and the metal pressing ring and the metal lower shell are fixedly connected by welding.

[0011] As a further improvement of the present invention, an upper label slot and a lower label slot matching the upper and lower outer shapes of the chip and antenna of the RFID electronic tag are respectively formed on the lower end surface of the metal upper shell and the inner bottom surface of the metal lower shell. The upper and lower ends of the chip and antenna of the RFID electronic tag are respectively and tightly inserted into the upper label slot and the lower label slot in a one-to-one correspondence.

[0012] As a further improvement of the present invention, an upper support post slot and a lower support post slot are respectively provided on the lower end surface of the metal upper shell and the inner bottom surface of the metal lower shell. At least one PEEK support post is also provided. The upper and lower ends of each PEEK support post are respectively and inserted into the upper support post slot and the lower support post slot in a one-to-one correspondence. The PEEK-filled inner core is coated on the outer circumference of the PEEK support post.

[0013] As a further improvement of the present invention, a lower T-shaped platform with a larger upper diameter than the lower diameter is provided on the inner bottom surface of the metal lower shell, and an upper T-shaped platform with a larger lower diameter than the upper diameter is provided on the lower end surface of the metal upper shell. The PEEK-filled inner core is tightly coated on the outer sides of the lower T-shaped platform and the T-shaped platform.

[0014] An RFID electronic tag encapsulation method, the specific steps are as follows:

[0015] Step 1: Process and manufacture a metal upper shell, a metal lower shell, and a metal pressing ring from stainless steel materials;

[0016] Step 2: First, fix and install the chip and antenna of the RFID electronic tag in the upper tag slot at the lower end of the processed metal upper shell by an interference fit method, and insert the PEEK support columns into the upper support column slots at the lower end of the metal upper shell one by one, so that the metal upper shell, the chip and antenna of the RFID electronic tag, and the PEEK support columns form a fixed integral structure;

[0017] Step 3: Install the metal upper shell with the chip and antenna of the RFID electronic tag and the PEEK support columns into the metal lower shell, and insert the lower ends of the chip and antenna of the RFID electronic tag and the PEEK support columns into the lower tag slot and the lower support column slot on the inner bottom surface of the metal lower shell;

[0018] Step 4: Fill the gap between the metal upper shell and the metal lower shell with PEEK material by injection molding. After injection molding, all parts form an integral whole;

[0019] Step 5: Finish machining the sealing contact surface formed by the upper end surface of the PEEK-filled inner core formed by the upper end surface of the side wall of the metal lower shell, the outer surface of the metal upper shell, and the PEEK filling material by a CNC lathe. It is required that the roughness of the sealing surface is less than Ra0.8;

[0020] Step 6: Put the sealing gasket formed of perfluororubber material on the outside of the metal upper shell, heat the PEEK pressing plate to 250°C, and put the heated PEEK pressing plate on the outside of the metal upper shell. Press the PEEK pressing plate in place under a pressure of 1000N by a press, wait for cooling and then release the press. The sealing gasket and the PEEK pressing plate are then hermetically fitted to the processed sealing area;

[0021] Step 7: Heat the processed metal pressing ring to 250°C, put the heated metal pressing ring on the outside of the metal lower shell, and press the metal pressing ring in place under a pressure of 10000N by a press;

[0022] Step 8: High-frequency welding is performed on the seam between the metal pressing ring and the metal lower shell. After assembly, the chip and antenna of the RFID electronic tag are completely sealed and protected, and a signal transmission port without metal coverage is formed between the metal pressing ring and the metal upper shell.

[0023] The beneficial effects of the present invention are as follows: The chip and antenna of the RFID electronic tag are encapsulated and sealed by in-mold injection using PEEK-filled plastic, and are protected on the outside by a metal upper shell, a metal lower shell, and a metal pressing ring made of stainless steel. A perfluoroelastomer sealing gasket is also used for sealing, so that the chip and antenna of the RFID electronic tag are fully sealed. Since the coefficient of thermal expansion of the PEEK material is 3-4 times that of the metal, the sealing performance of this structure will be better at high temperatures, thus ensuring the sealing performance of the encapsulation structure in a high-temperature environment and achieving full protection of the RFID electronic tag. This encapsulation mechanism can withstand a high temperature of 250°C and an external pressure of 150 Mpa, and can effectively protect the chip and antenna inside the encapsulation structure, enabling the chip and antenna to be used under high-temperature and high-pressure conditions for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the front view of the RFID electronic tag encapsulation structure of the present invention;

[0025] Figure 2 is Figure 1 the sectional view taken along line A-A in

[0026] Figure 3 is the exploded view of the RFID electronic tag encapsulation structure of the present invention;

[0027] Figure 4 is the state diagram of the PEEK material injection filling of the present invention;

[0028] Figure 5 is Figure 4 the sectional view taken along line B-B in

[0029] Figure 6 is the schematic diagram of the position of the sealing contact surface that needs to be finely processed in the present invention;

[0030] Figure 7 is the state diagram after the assembly of the sealing gasket and the PEEK pressing plate of the present invention;

[0031] Figure 8 is the schematic diagram of the high-frequency welding position between the metal pressing ring and the metal lower shell of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] Embodiment: An RFID electronic tag packaging structure includes a metal shell, a PEEK filled inner core 1, a PEEK pressing plate 2 and a sealing gasket 3. An opening structure is formed at the upper end of the metal shell. The PEEK filled inner core 1 is fixedly filled in the metal shell. A chip 4 accommodating cavity and an antenna 5 accommodating cavity for stopping and accommodating the chip 4 and the antenna 5 of the RFID electronic tag are formed in the PEEK filled inner core 1. The sealing gasket 3 covers the upper side surface of the PEEK filled inner core 1. The PEEK pressing plate 2 is fixedly installed inside the opening end of the metal shell. The PEEK pressing plate 2 tightly presses on the upper side surface of the sealing gasket 3 so that the sealing gasket 3 is in sealing contact with the inner side wall of the metal shell and the upper side surface of the PEEK filled inner core 1. The signal can communicate with the antenna 5 of the RFID electronic tag through the opening structure of the metal shell and through the PEEK pressing plate 2 and the sealing gasket 3.

[0033] The PEEK filled inner core 1 is preferably made of a PEEK filled plastic with 30% glass fiber reinforcement by in-mold injection molding. The long-term working temperature of this kind of PEEK filled inner core 1 can reach 260°C. The sealing gasket 3 is preferably made of perfluororubber material, and its long-term working temperature can reach 350°C. The metal shell is preferably made of stainless steel material and will not be corroded during long-term use. After encapsulating the chip 4 and the antenna 5 of the RFID electronic tag through the above packaging structure, the metal shell can resist strong external pressure. At the same time, the thermal expansion coefficient of PEEK is 3-4 times that of metal. Therefore, in a high-temperature environment, the sealing performance of this structure will be better, and it can effectively protect the chip 4 and the antenna 5 encapsulated therein to achieve a long-term stable sealed state. This sealing structure has excellent high-temperature resistance, corrosion resistance and high-pressure resistance. At the same time, because there is an opening structure on the metal shell, it will not shield the signal, and the communication signal can be transmitted smoothly.

[0034] The metal housing includes a metal lower housing 6, a metal upper housing 7 and a metal pressing ring 8. The metal lower housing 6 is a barrel structure with an open upper end. The metal upper cover can be fixedly connected to the upper end face of the PEEK-filled inner core 1 to form an integral structure, and the metal upper cover covers the chip 4 and the antenna 5 of the RFID electronic tag. The outer diameter of the metal upper housing 7 is smaller than the inner diameter of the upper end opening of the metal lower housing 6. The sealing gasket 3 is sleeved on the outer side of the metal upper housing 7, and the sealing gasket 3 completely covers the annular upper surface of the PEEK-filled inner core 1 located between the metal lower housing 6 and the metal upper housing 7. The PEEK pressing plate 2 is tightly sleeved on the outer side of the metal upper housing 7 and presses the upper side of the sealing gasket 3. The metal pressing ring 8 can be fixedly installed on the metal lower housing 6 and press the upper end of the PEEK pressing plate 2. The metal lower housing 6, the metal upper housing 7 and the metal pressing ring 8 are preferably made of stainless steel SUS316L. The metal housing is designed as a split structure, which is convenient for encapsulating the RFID electronic tag. The annular gap between the metal upper housing 7 and the upper end opening of the metal lower housing 6 can be used for signal transmission, and the metal pressing ring 8 can ensure the stable connection state of the entire encapsulation structure.

[0035] A radially outwardly convex flange 71 is formed on the outer circumferential side wall of the lower end of the metal upper housing 7. The sealing gasket 3 covers the upper end face of the flange 71 on the outer side of the metal upper housing 7 and the upper end side wall of the metal lower housing 6. The lower end of the PEEK pressing plate 2 completely covers the upper side surface of the sealing gasket 3. The sealing gasket 3 completely covers and seals the gaps between the metal upper housing 7, the metal lower housing 6 and the PEEK-filled inner core 1 by covering the flange 71 at the lower end of the metal upper housing 7 and the upper end side wall of the metal lower housing 6. The sealing is stable, and by pressing the flange 71 at the lower end of the metal upper housing 7 and the upper end side wall of the metal lower housing 6 with the PEEK pressing plate 2, the stable connection between the metal upper housing 7, the PEEK-filled inner core 1 and the metal lower housing 6 can be ensured.

[0036] A radially outwardly convex step 21 is formed on the outer circumferential side wall of the PEEK pressing plate 2. A radially inwardly retracted retaining ring 81 is formed on the inner side wall of the upper end of the metal pressing ring 8. The retaining ring 81 of the metal pressing ring 8 abuts against the radially outwardly convex step 21 of the PEEK pressing plate 2. The PEEK pressing plate 2 forms a stepped structure, which can make the upper end face of the PEEK pressing plate 2, the upper end face of the metal upper housing 7 and the upper end face of the metal pressing ring 8 be in the same plane after encapsulation, so that the entire encapsulation structure forms a small block with a regular shape, which is convenient for being inserted into the small holes of the drill pipe or the well casing.

[0037] The radially outwardly convex step 21 on the outer circumference of the PEEK pressing plate 2 is transitionally connected to the outer circumferential side wall of the PEEK pressing plate 2 above it through a first inclined surface 22. The inner side wall of the retaining ring 81 of the metal pressing ring 8 forms a second inclined surface 82 matching the first inclined surface 22, and the second inclined surface 82 closely adheres to the surface of the first inclined surface 22. Through the inclined surface contact, the assembly sealing performance can be better, the contact is closer, the pressing force is greater, and the assembly is more smooth.

[0038] The metal pressing ring 8 is tightly sleeved outside the metal lower shell 6, and the metal pressing ring 8 and the metal lower shell 6 are fixedly connected by welding. After the metal pressing ring 8 and the outer wall of the metal lower shell 6 are connected by interference fit, they are further fixedly connected by high-frequency welding, which can improve the connection strength of the overall structure and will not come off even under greater pressure and tensile force. The best lower end of the metal pressing ring 8 is flush with the lower end of the metal lower shell 6, and the edge of the lower end of the metal lower shell 6 can form a rounded corner. During welding, the solder can be accommodated in the groove formed between the rounded corner at the lower end of the metal lower shell 6 and the lower end of the metal pressing ring 8, finally making the lower end of the entire encapsulation structure flush.

[0039] On the lower end surface of the metal upper shell 7 and the inner bottom surface of the metal lower shell 6, an upper label slot 72 and a lower label slot 61 are respectively formed, which are matched with the upper and lower ends of the chip 4 and the antenna 5 of the RFID electronic tag in shape. The upper and lower ends of the chip 4 and the antenna 5 of the RFID electronic tag are respectively and tightly inserted into the upper label slot 72 and the lower label slot 61 in one-to-one correspondence. During encapsulation, first, the upper and lower ends of the chip 4 and the antenna 5 of the RFID electronic tag are respectively inserted into the upper label slot 72 and the lower label slot 61 in one-to-one correspondence to realize the preliminary positioning of the RFID electronic tag with the metal upper shell 7 and the metal lower shell 6, which is convenient for putting its pre-assembled structure into the injection mold for in-mold injection.

[0040] On the lower end surface of the metal upper shell 7 and the inner bottom surface of the metal lower shell 6, an upper support post slot and a lower support post slot are respectively provided, and at least one PEEK support post 9 is also provided. The upper and lower ends of each PEEK support post 9 are respectively and tightly inserted into the upper support post slot and the lower support post slot in one-to-one correspondence, and the PEEK filling core 1 is coated on the outer circumference of the PEEK support post 9. The PEEK support post 9 can be one, two or more, and is installed according to actual needs. Its installation purpose is to increase the structural stability, ensure that the entire pre-assembled structure will not be deformed under pressure during in-mold injection, and ensure the effective encapsulation of the chip 4 and the antenna 5 of the RFID electronic tag.

[0041] On the inner bottom surface of the metal lower shell 6, a lower T-shaped platform 73 with a larger upper end diameter than the lower end diameter is provided, and on the lower end surface of the metal upper shell 7, an upper T-shaped platform 62 with a larger lower end diameter than the upper end diameter is provided. The PEEK filling core 1 is tightly coated in a filling manner on the outer sides of the lower T-shaped platform 73 and the T-shaped platform. The upper T-shaped platform 62 at the lower end of the metal upper shell 7 and the lower T-shaped platform 73 on the bottom surface of the metal lower shell 6 form a reverse buckling structure, which can ensure that all parts form a stable whole after injection molding and prevent the PEEK filling core 1 from coming off from the metal upper shell 7 and the metal lower shell 6. In addition, a number of inner convex structures can also be formed on the side wall of the metal lower shell 6, and an L-shaped convex structure can also be formed at the lower end of the metal upper shell 7 to realize the embedded connection with the PEEK filling core 1.

[0042] An RFID electronic tag encapsulation method, the specific steps are as follows:

[0043] Step 1: Process and manufacture the metal upper shell 7, metal lower shell 6 and metal pressing ring 8 through stainless steel materials;

[0044] Step 2: First, fix and install the chip 4 and antenna 5 of the RFID electronic tag in the upper tag slot 72 at the lower end of the processed metal upper shell 7 by means of interference fit, and insert the PEEK support columns 9 into the upper support column slots at the lower end of the metal upper shell 7 one by one, so that the metal upper shell 7, the chip 4 and antenna 5 of the RFID electronic tag, and the PEEK support columns 9 form a fixed integral structure;

[0045] Step 3: Install the metal upper shell 7 equipped with the chip 4 and antenna 5 of the RFID electronic tag and the PEEK support columns 9 into the metal lower shell 6, and make the lower ends of the chip 4 and antenna 5 of the RFID electronic tag and the PEEK support columns 9 inserted into the lower tag slot 61 and the lower support column slot on the inner bottom surface of the metal lower shell 6;

[0046] Step 4: Fill the PEEK material into the gap between the metal upper shell 7 and the metal lower shell 6 by injection molding. After injection molding, all parts form a whole;

[0047] Step 5: Finish machining the sealed contact surface formed by the combination of the upper end surface of the PEEK filling inner core 1 formed by the upper end surface of the side wall of the metal lower shell 6, the outer side surface of the metal upper shell 7 and the PEEK filling material by a CNC lathe. It is required that the surface roughness of the sealed surface is less than Ra0.8;

[0048] Step 6: Put the sealing gasket 3 made of perfluororubber material on the outside of the metal upper shell 7, heat the PEEK pressing plate 2 to 250°C, and put the heated PEEK pressing plate 2 on the outside of the metal upper shell 7. Press the PEEK pressing plate 2 in place under a pressure of 1000N by a press. Wait for cooling and then release the press. The sealing gasket 3 and the PEEK pressing plate 2 are then sealed and fitted on the processed sealed area;

[0049] Step 7: Heat the processed metal pressing ring 8 to 250°C, and put the heated metal pressing ring 8 on the outside of the metal lower shell 6. Press the metal pressing ring 8 in place under a pressure of 10000N by a press;

[0050] Step 8: Perform high-frequency welding on the joint 10 of the metal pressing ring 8 and the metal lower shell 6 for one circle. After assembly, the chip 4 and antenna 5 of the RFID electronic tag are completely sealed and protected, and a signal transmission port without metal coverage is formed between the metal pressing ring 8 and the metal upper shell 7.

Claims

1. An RFID electronic tag packaging structure, characterized in that: It includes a metal shell, a PEEK-filled inner core (1), a PEEK pressing plate (2) and a sealing gasket (3). An opening structure is formed at the upper end of the metal shell. The PEEK-filled inner core is fixedly filled in the metal shell. A chip accommodating cavity and an antenna accommodating cavity for stopping and accommodating the chip (4) and antenna (5) of the RFID electronic tag are formed in the PEEK-filled inner core. The sealing gasket covers the upper side surface of the PEEK-filled inner core. The PEEK pressing plate is fixedly installed on the inner side of the opening end of the metal shell. The PEEK pressing plate tightly presses on the upper side surface of the sealing gasket so that the sealing gasket is in sealing contact with the inner side wall of the metal shell and the upper side surface of the PEEK-filled inner core. The signal can communicate with the antenna of the RFID electronic tag through the opening structure of the metal shell and through the PEEK pressing plate and the sealing gasket.

2. The RFID electronic tag packaging structure according to claim 1, wherein: The metal shell includes a metal lower shell (6), a metal upper shell (7) and a metal pressing ring (8). The metal lower shell is a barrel structure with an open upper end. The metal upper cover can be fixedly connected to the upper end face of the PEEK-filled inner core to form an integral structure, and the metal upper cover covers above the chip and antenna of the RFID electronic tag. The outer diameter of the metal upper shell is smaller than the inner diameter of the upper end opening of the metal lower shell. The sealing gasket is sleeved on the outer side of the metal upper shell. The sealing gasket completely covers the annular upper surface of the PEEK-filled inner core between the metal lower shell and the metal upper shell. The PEEK pressing plate is tightly sleeved on the outer side of the metal upper shell and presses the upper side of the sealing gasket. The metal pressing ring can be fixedly installed on the metal lower shell and presses the upper end of the PEEK pressing plate.

3. The RFID electronic tag packaging structure according to claim 2, characterized in that: A circumferential outer convex flange (71) is formed on the outer circumferential side wall at the lower end of the metal upper shell. The sealing gasket covers the upper end face of the flange on the outer side of the metal upper shell and the upper end face of the side wall of the metal lower shell. The lower end of the PEEK pressing plate completely covers the upper side surface of the sealing gasket.

4. The RFID electronic tag packaging structure according to claim 2, wherein: A circumferential outer convex step (21) is formed on the outer circumferential side wall of the PEEK pressing plate. A radially retracted retaining ring (81) is formed on the inner side wall at the upper end of the metal pressing ring. The retaining ring of the metal pressing ring tightly abuts against the circumferential outer convex step of the PEEK pressing plate.

5. The RFID electronic tag packaging structure according to claim 4, wherein: The circumferential outer convex step of the PEEK pressing plate is transitionally connected to the outer circumferential side wall of the PEEK pressing plate above it through a first inclined surface (22). The inner side wall of the retaining ring of the metal pressing ring forms a second inclined surface (82) matching the first inclined surface. The second inclined surface closely adheres to the surface of the first inclined surface.

6. The RFID electronic tag packaging structure according to claim 2, wherein: The metal pressing ring is tightly sleeved on the outer side of the metal lower shell, and the metal pressing ring and the metal lower shell are fixedly connected by welding.

7. The RFID electronic tag packaging structure according to claim 2, characterized in that: Upper label slots (72) and lower label slots (61) matching the upper and lower end outer shapes of the chip and antenna of the RFID electronic tag are respectively formed on the lower end surface of the metal upper shell and the inner bottom surface of the metal lower shell. The upper and lower ends of the chip and antenna of the RFID electronic tag are respectively and closely inserted into the upper label slot and the lower label slot in a one-to-one correspondence.

8. The RFID electronic tag packaging structure according to claim 2, characterized in that: An upper support post slot and a lower support post slot are respectively provided on the lower end face of the metal upper shell and the inner bottom surface of the metal lower shell. There is also at least one PEEK support post (9). The upper and lower ends of each PEEK support post are respectively inserted into the upper support post slot and the lower support post slot in a one-to-one correspondence. The PEEK filling inner core is coated on the outer circumference of the PEEK support post.

9. The RFID electronic tag packaging structure according to claim 2, characterized in that: A lower T-shaped platform (73) with a larger upper end diameter than the lower end diameter is provided on the inner bottom surface of the metal lower shell. An upper T-shaped platform (62) with a larger lower end diameter than the upper end diameter is provided on the lower end face of the metal upper shell. The PEEK filling inner core is tightly coated on the outer sides of the lower T-shaped platform and the T-shaped platform in a filling manner.

10. An RFID electronic tag encapsulation method for forming the RFID electronic tag encapsulation structure described in claims 1-9, characterized in that: The specific steps are as follows: Step 1: Process and manufacture the metal upper shell, metal lower shell, and metal pressing ring from stainless steel materials. Step 2: First, fix and install the chip and antenna of the RFID electronic tag in the upper tag slot at the lower end of the processed metal upper shell by an interference fit method, and insert the PEEK support posts into the upper support post slots at the lower end of the metal upper shell in a one-to-one correspondence, so that the metal upper shell, the chip and antenna of the RFID electronic tag, and the PEEK support posts form a fixed integrated structure. Step 3: Install the metal upper shell with the chip and antenna of the RFID electronic tag and the PEEK support posts into the metal lower shell, and insert the lower ends of the chip and antenna of the RFID electronic tag and the PEEK support posts into the lower tag slot and the lower support post slot on the inner bottom surface of the metal lower shell. Step 4: Fill the PEEK material into the gap between the metal upper shell and the metal lower shell by injection molding. After injection molding, all parts form a whole. Step 5: Finish the precision machining of the sealing contact surface formed by the upper end surface of the PEEK filling inner core formed by the upper end face of the side wall of the metal lower shell, the outer side surface of the metal upper shell, and the PEEK filling material by a numerically controlled lathe. It is required that the roughness of the sealing surface is less than Ra0.

8. Step 6: Put the sealing gasket formed by the perfluoroelastomer material on the outer side of the metal upper shell, heat the PEEK pressing plate to 250°C, and put the heated PEEK pressing plate on the outer side of the metal upper shell. Press the PEEK pressing plate in place under a pressure of 1000N by a press. Wait for cooling and then release the press. The sealing gasket and the PEEK pressing plate are then hermetically bonded to the processed sealing area. Step 7: Heat the processed metal pressing ring to 250°C, and put the heated metal pressing ring on the outer side of the metal lower shell. Use a press to press the metal pressing ring in place under a pressure of 10000N. Step 8: Perform high-frequency welding on the seam (10) between the metal pressing ring and the metal lower shell in a circle. After assembly, the chip and antenna of the RFID electronic tag are completely sealed and protected, and a signal transmission port without metal coverage is formed between the metal pressing ring and the metal upper shell.

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