Plastic packaging device for RFID (Radio Frequency Identification Device) tag card
By designing an RFID tag card sealing device including a rotary plastic sealing mechanism, a grinding mechanism and a fixing mechanism, the problem of cavity and inability to automatically seal elliptical tag card in the prior art is solved, and an efficient and automated plastic sealing process is realized, and the sealing performance and service life are improved.
Patent Information
- Application Number
- CN202510255335.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-05
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2045-03-05
AI Technical Summary
The existing RFID tag card sealing device has a cavity when sealing the plastic film, resulting in poor sealing performance and inability to automatically seal the elliptical tag card, and the artificial plastic sealing efficiency is low.
An RFID tag card sealing device including a rotary sealing mechanism, a grinding mechanism and a fixing mechanism is designed. By rotating the plastic sealing mechanism, the sides of the plastic sealing film are shaped into a vertical structure that is completely fitted with the side of the label card, and the polishing mechanism is used to polish the surface of the label card into a flat oval structure, so that the plastic sealing film can be fixed tightly.
It realizes efficient plastic sealing of RFID tag cards, prevents relative movement between the tag card and the plastic sealing film after plastic sealing, improves sealing performance and service life, and greatly improves efficiency.
Smart Images

Figure CN119748846A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of label card plastic sealing, and in particular to a RFID label card plastic sealing device. Background Art
[0002] RFID stands for radio frequency identification technology. RFID tag card is a card that uses radio frequency signals for contactless data transmission and identifies specific target objects through the transmitted data. It does not require human intervention, can work in various harsh environments, and can quickly and accurately identify target objects. RFID tag cards are often used in identity recognition systems such as access control cards. The shape of this RFID tag card is generally an elliptical cylinder structure. When using RFID tag cards, a layer of plastic film is usually sealed on the outer surface to isolate the air and increase the service life of the internal chip.
[0003] When the existing device seals the RFID tag card with a plastic film, the sealing film is generally two elliptical plastic films. When sealing, the two films are placed at the two ends of the RFID tag card respectively, and then the edges of the two films are squeezed by a heat sealer. Since the side of the elliptical tag card is a vertical surface, there will be a cavity between the edge of the film sealed in this way and the side of the tag card. When used for a long time, the tag card and the film will move relative to each other, which may easily cause the outer film to be damaged under the squeezing of the tag card, and the sealing performance is poor. The existing device cannot automatically seal the elliptical tag, and the efficiency of manual sealing is very low. Summary of the invention
[0004] The purpose of the present invention is to solve the shortcomings of the background technology and to propose an RFID tag card plastic sealing device.
[0005] To achieve the above objectives, the technical solution adopted by the present invention is: an RFID tag card plastic sealing device, comprising a main body plate, a rotating plastic sealing mechanism for tightly sealing the films at both ends of the ellipsoidal tag card is arranged at the upper end of the main body plate, the rotating plastic sealing mechanism comprises a second placement groove opened at the upper end of the main body plate, a fixing ring is rotatably connected in the second placement groove, a first electric telescopic rod is fixedly connected to the upper end of the fixing ring, a first electric telescopic rod is fixedly connected to the telescopic end of the first electric telescopic rod, a fourth fixed body is fixedly connected to the telescopic end of the first electric telescopic rod, a first empty groove is opened on the side of the fourth fixed body, a second fixed body is arranged in the first empty groove of the first fixed body, a polishing mechanism for polishing the surface of the ellipsoidal tag card is arranged at the upper end of the main body plate, and a fixing mechanism for limiting the film and the tag card is arranged at the upper end of the main body plate.
[0006] Preferably, a third motor is fixedly connected to the side surface of the first fixed body, a transmission shaft of the third motor rotates and passes through the first fixed body, an end of the transmission shaft of the third motor is fixedly connected to the second fixed body, a second empty groove is opened on the side surface of the second fixed body, and second electric telescopic rods are fixedly connected to the upper and lower ends of the second fixed body respectively.
[0007] Preferably, the telescopic ends of the two second electric telescopic rods are respectively fixedly connected to the second motors, the drive shaft ends of the two second motors are respectively fixedly connected to hot melt rods, the two hot melt rods are arranged in parallel on a vertical plane, and the surfaces of the two hot melt rods are connected to pressure sensors.
[0008] Preferably, a first placement groove communicating with the second placement groove is opened at the upper end of the main body plate, a first motor is fixedly connected to the main body plate in the first placement groove, a gear is fixedly connected to the transmission shaft end of the first motor, and a gear ring meshing with the gear is fixedly connected to the side of the fixing ring.
[0009] Preferably, the grinding mechanism includes a first limiting groove opened at the upper end of the main plate, a first limiting body is slidably fitted in the first limiting groove, a third electric telescopic rod is fixedly connected to the upper end of the first limiting body, the telescopic end of the third electric telescopic rod is fixedly connected to a third fixed body, a third empty groove is opened on the side of the third fixed body, the third fixed body is rotatably connected to a rotating rod in the third empty groove, and a fixed plate is fixedly connected to the side of the rotating rod.
[0010] Preferably, a fifth motor is fixedly connected to the end of the fixed plate, a grinding rod is fixedly connected to the transmission shaft end of the fifth motor, the end of the grinding rod is a curved surface structure, pressure sensors are respectively provided on the side and end of the grinding rod, a seventh motor is fixedly connected to the side of the third fixed body, and the transmission shaft end of the seventh motor and the end of the rotating rod are fixedly connected.
[0011] Preferably, the main body plate is fixedly connected to a fourth motor in the first limiting groove, the transmission shaft end of the fourth motor is fixedly connected to a first threaded rod, a threaded hole is penetrated through the side surface of the first limiting body, and the side surface of the first threaded rod is matched with the threaded hole.
[0012] Preferably, the main body plate includes a third placement groove opened at the upper end of the main body plate, the main body plate is fixedly connected with a sixth motor in the third placement groove, the transmission shaft end of the sixth motor is fixedly connected with a fourth fixing body, the upper end of the fourth fixing body is provided with a fourth empty groove, the lower end of the fourth fixing body is provided with a plurality of through holes, the inner side surface of the fourth fixing body is fixedly connected with a partition, and an air pump is provided at the end of the partition.
[0013] Preferably, the fourth fixed body is fixedly connected with a porous plate in the fourth empty slot, the upper end of the porous plate is a flexible structure, and the upper end of the porous plate is higher than the upper end of the fourth fixed body.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] 1. The fifth motor drives the polishing rod to polish the upper end surface of the label card, and then the fourth motor drives the first limiter to move outward, so that the end of the polishing rod polishes the side surface of the label card. At the same time, the sixth motor is started, and the sixth motor drives the fourth fixed body to rotate, thereby driving the label card to rotate, so that the surface of the label card can be completely polished, so that the upper and lower end surfaces of the polished label card are flat elliptical structures, and the side surfaces are vertical structures, so that the subsequent plastic sealing film can be closely fixed on the surface of the label card;
[0016] 2. The first electric telescopic rod and the fourth electric telescopic rod are extended, and at the same time, the third motor drives the second fixed body to rotate 90° to ensure that the end of the hot melt rod remains stationary after rotation. Then, while the fixed ring drives the hot melt rod to rotate, the two second motors drive the hot melt rods to rotate respectively, and the two hot melt rods begin to heat up, so that the two hot melt rods can shape the side of the plastic sealing film into a vertical structure that is completely in line with the side of the label card. Then, the first electric telescopic rod drives the fourth electric telescopic rod to rise to a position of half the height of the side of the label card. Then, while the first electric telescopic rod and the fourth electric telescopic rod are extended and retracted, the third motor rotates to rotate to a horizontal position without changing the position of the end of the hot melt rod, and shape the side of the plastic sealing film into a ring-shaped connecting film. Then, the two shaped sealing films are respectively clamped on the upper and lower end surfaces of the label card, and the two hot melt rods perform hot-melt fixing on the outermost connecting film of the plastic sealing film, so that the plastic sealing film can be completely close to the surface of the label card, so as to prevent the label card and the plastic sealing film from moving relative to each other after the plastic sealing, and to prevent the plastic sealing film from being damaged due to collision, thereby improving the service life of the label card after plastic sealing. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;
[0018] Figure 2 The present invention is a sectional view of the whole Figure 1 ;
[0019] Figure 3 The present invention is a sectional view of the whole Figure 2 ;
[0020] Figure 4 For the present invention Figure 2 A magnified image of point A;
[0021] Figure 5 For the present invention Figure 2 The enlarged view of point B;
[0022] Figure 6 For the present invention Figure 2 Enlarged view of point C;
[0023] Figure 7 For the present invention Figure 2 The enlarged view of point D;
[0024] Figure 8 For the present invention Figure 2 The enlarged view of point E;
[0025] Fig. 9 For the present invention Figure 3 The enlarged view of point F;
[0026] Fig.10 It is a schematic diagram of the cross-sectional structure of the label card after plastic sealing.
[0027] 1. Main plate; 2. Rotating plastic sealing mechanism; 3. Grinding mechanism; 4. Fixing mechanism; 21. First placement slot; 22. Gear; 24. Second placement slot; 25. First motor; 26. Fixing ring; 27. Gear ring; 28. First electric telescopic rod; 29. First fixed body; 210. First empty slot; 211. Second fixed body; 212. Second electric telescopic rod; 213. Second motor; 214. Hot melt rod; 215. Second empty slot; 216. Third motor; 217. Fourth electric telescopic rod ; 31. first limiting groove; 32. first threaded rod; 33. fourth motor; 34. first limiting body; 35. threaded hole; 36. third electric telescopic rod; 37. third fixed body; 38. rotating rod; 39. fixed plate; 310. fifth motor; 311. grinding rod; 312. third empty groove; 313. seventh motor; 41. third placement groove; 42. sixth motor; 43. fourth fixed body; 44. porous plate; 45. through hole; 46. partition; 47. air pump; 48. fourth empty groove. DETAILED DESCRIPTION
[0028] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.
[0029] See also Figure 1 - Fig.10 A RFID tag card plastic sealing device comprises a main body plate 1, wherein the upper end of the main body plate 1 is provided with a rotating plastic sealing mechanism 2 for tightly sealing the films at both ends of the ellipsoidal tag card.
[0030] The rotating plastic sealing mechanism 2 includes a second placement groove 24 opened at the upper end of the main body plate 1, a fixing ring 26 is rotatably connected in the second placement groove 24, a first electric telescopic rod 28 is fixedly connected to the upper end of the fixing ring 26, a fourth electric telescopic rod 217 is fixedly connected to the telescopic end of the first electric telescopic rod 28, a first fixed body 29 is fixedly connected to the telescopic end of the fourth electric telescopic rod 217, a first fixed body 29 is fixedly connected to the telescopic end, a first empty groove 210 is opened on the side of the first fixed body 29, and a second fixed body 211 is arranged in the first empty groove 210 of the first fixed body 29.
[0031] A third motor 216 is fixedly connected to the side of the first fixed body 29, and a transmission shaft of the third motor 216 rotates and penetrates the first fixed body 29. The transmission shaft end of the third motor 216 is fixedly connected to the second fixed body 211. A second empty groove 215 is opened on the side of the second fixed body 211, and the upper and lower ends of the second fixed body 211 are respectively fixedly connected to the second electric telescopic rod 212.
[0032] The telescopic ends of the two second electric telescopic rods 212 are respectively fixedly connected to the second motors 213, and the transmission shaft ends of the two second motors 213 are respectively fixedly connected to the hot melt rods 214. The two hot melt rods 214 are arranged in parallel on a vertical plane, and the surfaces of the two hot melt rods 214 are connected to pressure sensors.
[0033] The upper end of the main body plate 1 is provided with a first placement groove 21 which is communicated with the second placement groove 24. The main body plate 1 is fixedly connected with a first motor 25 in the first placement groove 21. The transmission shaft end of the first motor 25 is fixedly connected with a gear 22. The side of the fixing ring 26 is fixedly connected with a gear ring 27 which is meshed with the gear 22.
[0034] Specifically, the first electric telescopic rod 28 and the fourth electric telescopic rod 217 are extended, and at the same time, the third motor 216 drives the second fixed body 211 to rotate 90°, ensuring that the end of the hot-melt rod 214 remains stationary after rotation. Then, while the fixing ring 26 drives the hot-melt rod 214 to rotate, the two second motors 213 respectively drive the hot-melt rods 214 to rotate, and the two hot-melt rods 214 begin to heat up, so that the two hot-melt rods 214 can shape the side of the plastic film into a vertical structure that is completely in contact with the side of the label card.
[0035] The upper end of the main body plate 1 is provided with a grinding mechanism 3 for grinding the surface of the ellipsoid label card.
[0036] The grinding mechanism 3 includes a first limiting groove 31 opened at the upper end of the main body plate 1, a first limiting body 34 is slidably fitted in the first limiting groove 31, a third electric telescopic rod 36 is fixedly connected to the upper end of the first limiting body 34, a telescopic end of the third electric telescopic rod 36 is fixedly connected to a third fixed body 37, a third empty groove 312 is opened on the side of the third fixed body 37, the third fixed body 37 is rotatably connected to a rotating rod 38 in the third empty groove 312, and a fixed plate 39 is fixedly connected to the side of the rotating rod 38.
[0037] The end of the fixed plate 39 is fixedly connected to the fifth motor 310, the transmission shaft end of the fifth motor 310 is fixedly connected to the grinding rod 311, the end of the grinding rod 311 is a curved surface structure, and the side and end of the grinding rod 311 are respectively provided with pressure sensors, the side of the third fixed body 37 is fixedly connected to the seventh motor 313, and the transmission shaft end of the seventh motor 313 is fixedly connected to the end of the rotating rod 38.
[0038] The main body plate 1 is fixedly connected with a fourth motor 33 in the first limiting groove 31, and the transmission shaft end of the fourth motor 33 is fixedly connected with a first threaded rod 32. A threaded hole 35 is penetrated through the side of the first limiting body 34, and the side of the first threaded rod 32 is matched with the threaded hole 35.
[0039] Specifically, the first threaded rod 32 cooperates to drive the first limiting body 34 to move back and forth along the first limiting groove 31. While moving, the third electric telescopic rod 36 extends, and the seventh motor 313 drives the polishing rod 311 to rotate to a horizontal position. The third electric telescopic rod 36 drives the side of the polishing rod 311 to contact the upper end surface of the label card, and then the fifth motor 310 is started, and the fifth motor 310 drives the polishing rod 311 to polish the upper end surface of the label card.
[0040] The upper end of the main body plate 1 is provided with a fixing mechanism 4 for limiting the film and the label card.
[0041] The main body plate 1 includes a third placement groove 41 opened at the upper end of the main body plate 1, and the main body plate 1 is fixedly connected with a sixth motor 42 in the third placement groove 41, and the transmission shaft end of the sixth motor 42 is fixedly connected with a fourth fixed body 43, and the upper end of the fourth fixed body 43 is provided with a fourth empty groove 48, and the lower end of the fourth fixed body 43 is provided with a plurality of through holes 45, and the inner side surface of the fourth fixed body 43 is fixedly connected with a partition 46, and an air pump 47 is provided at the end of the partition 46.
[0042] The fourth fixed body 43 is fixedly connected with a porous plate 44 in the fourth empty groove 48 . The upper end of the porous plate 44 is a flexible structure, and the upper end of the porous plate 44 is higher than the upper end of the fourth fixed body 43 .
[0043] Specifically, the label card with an ellipsoidal structure is placed on the upper end surface of the porous plate 44 , and then the air pump 47 is started, and the air pump 47 drives the air pressure above the partition 46 to decrease, thereby fixing the label card above the porous plate 44 .
[0044] When in use, place the main plate 1 on a horizontal plane, then place the label card with an ellipsoidal structure on the upper end surface of the porous plate 44, then start the air pump 47, which drives the air pressure above the partition 46 to decrease, thereby fixing the label card above the porous plate 44, and at the same time, start the fourth motor 33, the fourth motor 33 drives the first threaded rod 32 to rotate, and the first threaded rod 32 cooperates to drive the first limit body 34 to reciprocate along the first limit groove 31, while moving, the third electric telescopic rod 36 extends, the seventh motor 313 drives the polishing rod 311 to rotate to a horizontal position, and the third electric telescopic rod 36 drives the polishing rod 3 The side surface of 11 contacts the upper end surface of the label card, and then the fifth motor 310 is started, and the fifth motor 310 drives the polishing rod 311 to polish the upper end surface of the label card, and then the fourth motor 33 drives the first limiting body 34 to move outward, so that the end of the polishing rod 311 polishes the side surface of the label card, and at the same time, the sixth motor 42 is started, and the sixth motor 42 drives the fourth fixed body 43 to rotate, thereby driving the label card to rotate, so that the surface of the label card can be completely polished, so that the upper and lower end surfaces of the polished label card are a flat elliptical structure, and the side surface is a vertical structure, which is convenient for the subsequent plastic sealing film to be tightly fixed on the surface of the label card.
[0045] When the grinding is completed, the pressure sensor on the side of the grinding rod 311 is connected to the controller, and the surface shape of the label card after grinding can be drawn. Then the label card is removed, and the elliptical plastic film is placed on the upper end surface of the porous plate 44. At this time, the air pump 47 continues to limit the plastic film, and the area of the plastic film is slightly larger than the porous plate 44. The first motor 25 is started, and the first motor 25 drives the gear 22 to rotate, and the gear 22 cooperates to drive the gear ring 27 to rotate, and the gear ring 27 drives the fixed ring 26 to rotate at a uniform speed. At this time, the first electric telescopic rod 28 The first electric telescopic rod 28 is extended to move to a position corresponding to the upper end surface of the porous plate 44, and then the fourth electric telescopic rod 217 is extended to drive the hot melt rod 214 to move to the side of the plastic sealing mold. According to the surface drawing of the label card, the length from the end of the hot melt rod 214 to the center of the plastic sealing film is the same as the length from the side of the label card to the center at the same position. Then the first electric telescopic rod 28 and the fourth electric telescopic rod 217 are extended, and at the same time the third motor 216 drives the second fixed body 211 to rotate 90 degrees to ensure that the hot melt rod 214 is rotated. The ends 214 remain stationary, and then while the fixing ring 26 drives the hot melt rod 214 to rotate, the two second motors 213 respectively drive the hot melt rods 214 to rotate, and the two hot melt rods 214 begin to heat up, so that the two hot melt rods 214 can shape the side of the plastic film into a vertical structure that is completely in line with the side of the label card, and then the first electric telescopic rod 28 drives the fourth electric telescopic rod 217 to rise to a position half the height of the side of the label card, and then the first electric telescopic rod 28 and the fourth electric telescopic rod 217 are extended and retracted while the third electric telescopic rod 213 is extended and retracted. The machine 216 rotates to rotate to a horizontal position without changing the position of the end of the hot melt rod 214, and shapes the side of the plastic film into a ring-shaped connecting film. Then, the two shaped sealing films are respectively clamped on the upper and lower end surfaces of the label card. The two hot melt rods 214 hot-melt and fix the outermost connecting film of the plastic film, so that the plastic film can be completely and tightly attached to the surface of the label card, preventing relative movement between the label card and the plastic film when the plastic-sealed label card moves, preventing damage to the plastic film due to collision, and increasing the service life of the plastic-sealed label card.
[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.
Claims
1. An RFID tag card plastic sealing device, comprising a main body plate (1), characterized in that: The upper end of the main body plate (1) is provided with a rotating plastic sealing mechanism (2) for tightly sealing the films at both ends of the ellipsoid label card. The rotating plastic sealing mechanism (2) comprises a second placement groove (24) provided at the upper end of the main body plate (1). A fixing ring (26) is rotatably connected in the second placement groove (24). A first electric telescopic rod (28) is fixedly connected to the upper end of the fixing ring (26). A fourth electric telescopic rod (217) is fixedly connected to the telescopic end of the first electric telescopic rod (28). A first fixing body (29) is fixedly connected to the telescopic end of the fourth electric telescopic rod (217). A first empty groove (210) is provided on the side of the first fixing body (29). A second fixing body (211) is provided in the first empty groove (210). The upper end of the main body plate (1) is provided with a grinding mechanism (3) for grinding the surface of the ellipsoid label card. The upper end of the main body plate (1) is provided with a fixing mechanism (4) for limiting the film and the label card.
2. The RFID tag card plastic sealing device according to claim 1, characterized in that: A third motor (216) is fixedly connected to the side of the first fixed body (29); a transmission shaft of the third motor (216) rotates and passes through the first fixed body (29); an end of the transmission shaft of the third motor (216) is fixedly connected to the second fixed body (211); a second empty groove (215) is provided on the side of the second fixed body (211); and a second electric telescopic rod (212) is fixedly connected to the upper and lower ends of the second fixed body (211) respectively.
3. The RFID tag card plastic sealing device according to claim 2, characterized in that: The telescopic ends of the two second electric telescopic rods (212) are respectively fixedly connected to the second motors (213), the transmission shaft ends of the two second motors (213) are respectively fixedly connected to the hot melt rods (214), the two hot melt rods (214) are arranged in parallel on a vertical plane, and the surfaces of the two hot melt rods (214) are connected to pressure sensors.
4. The RFID tag card plastic sealing device according to claim 1, characterized in that: The upper end of the main body plate (1) is provided with a first placement groove (21) which is in communication with the second placement groove (24); the main body plate (1) is fixedly connected with a first motor (25) in the first placement groove (21); a transmission shaft end of the first motor (25) is fixedly connected with a gear (22); and a side surface of the fixing ring (26) is fixedly connected with a gear ring (27) which is meshed with the gear (22).
5. The RFID tag card plastic sealing device according to claim 1, characterized in that: The grinding mechanism (3) comprises a first limiting groove (31) provided at the upper end of the main body plate (1), a first limiting body (34) slidably fitted in the first limiting groove (31), a third electric telescopic rod (36) fixedly connected in the upper end of the first limiting body (34), a telescopic end of the third electric telescopic rod (36) fixedly connected to a third fixing body (37), a third empty groove (312) provided on the side of the third fixing body (37), a rotating rod (38) rotatably connected to the third fixing body (37) in the third empty groove (312), and a fixing plate (39) fixedly connected to the side of the rotating rod (38).
6. The RFID tag card plastic sealing device according to claim 5, characterized in that: A fifth motor (310) is fixedly connected to the end of the fixing plate (39), a grinding rod (311) is fixedly connected to the end of the transmission shaft of the fifth motor (310), the end of the grinding rod (311) is a curved surface structure, and pressure sensors are respectively provided on the side and end of the grinding rod (311), and a seventh motor (313) is fixedly connected to the side of the third fixing body (37), and the end of the transmission shaft of the seventh motor (313) is fixedly connected to the end of the rotating rod (38).
7. The RFID tag card plastic sealing device according to claim 5, characterized in that: The main body plate (1) is fixedly connected to a fourth motor (33) in the first limiting groove (31); a first threaded rod (32) is fixedly connected to the transmission shaft end of the fourth motor (33); a threaded hole (35) is formed through the side surface of the first limiting body (34); and the side surface of the first threaded rod (32) is matched with the threaded hole (35).
8. The RFID tag card plastic sealing device according to claim 1, characterized in that: The main body plate (1) comprises a third placement groove (41) provided at the upper end of the main body plate (1); a sixth motor (42) is fixedly connected to the main body plate (1) in the third placement groove (41); a fourth fixed body (43) is fixedly connected to the transmission shaft end of the sixth motor (42); a fourth empty groove (48) is provided at the upper end of the fourth fixed body (43); a plurality of through holes (45) are provided at the lower end of the fourth fixed body (43); a partition plate (46) is fixedly connected to the inner side surface of the fourth fixed body (43); an air pump (47) is provided at the end of the partition plate (46).
9. The RFID tag card plastic sealing device according to claim 8, characterized in that: The fourth fixed body (43) is fixedly connected to a porous plate (44) in the fourth empty slot (48); the upper end of the porous plate (44) is a flexible structure; the upper end of the porous plate (44) is higher than the upper end of the fourth fixed body (43).
Citation Information
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