High-frequency PCB dielectric constant on-line calibration pressing device

Abstract

The invention relates to the technical field of high-frequency printed circuit board manufacturing, in particular to a high-frequency PCB dielectric constant on-line calibration pressing device. According to the technical scheme, the multi-zone micro-heating array laminating machine comprises a laminating machine body, a sealing partition plate, a hydraulic cylinder, a lower pressing plate, a guide rod, a supporting seat, a multi-zone micro-heating array mechanism, a sliding plate, a calibration mechanism, a positioning mechanism, a driving mechanism, a lifting mechanism, an automatic opening and closing mechanism and a vacuumizing device. According to the invention, pre-scanning is carried out through the calibration mechanism, and online penetrating type scanning is carried out on a plate through the terahertz emitter and the receiver in the pressing process, so that dielectric constant data is obtained in real time; and then, each independent temperature zone in the multi-zone micro-heating array mechanism is controlled to perform differential heating based on the data, so that active compensation and accurate regulation and control of a local dielectric constant are realized. According to the invention, passive pressing is changed into active intelligent calibration, the problem of uneven dielectric constant distribution of the high-frequency PCB is fundamentally solved, and the product performance consistency and the production yield are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-frequency printed circuit board manufacturing, and in particular to a high-frequency PCB board material dielectric constant online calibration and pressing device. BACKGROUND

[0002] With the rapid development of high-frequency technologies such as 5G communication and millimeter wave radar, the performance requirements for high-frequency printed circuit boards are increasingly demanding. The dielectric constant is one of the most critical performance indicators of high-frequency PCB board materials, and its uniformity and stability directly determine the integrity and reliability of signal transmission.

[0003] Currently, the pressing manufacturing of high-frequency PCBs generally uses traditional large-scale hot pressing equipment. Although such equipment can provide a high-temperature and high-pressure environment, it has significant limitations. The hot pressing plate usually only has a single or a small number of temperature zones, and cannot perform differential fine temperature control on different areas within the board. However, during the heat curing process of the board, factors such as uneven heating field distribution, resin flow, and filler distribution can cause unpredictable fluctuations in the dielectric constant in space, resulting in inconsistent electrical performance of the final product and difficulty in improving the yield rate.

[0004] More fundamentally, the existing pressing process is a "blind operation" process. Without effective online monitoring means, it is impossible to real-time perceive the dynamic changes of the dielectric constant inside the board during the pressing process, and thus it is also impossible to actively regulate and control according to the monitoring results. The industry urgently needs a new generation of intelligent pressing equipment that can real-time monitor and actively regulate and control the dielectric constant during the pressing process. SUMMARY

[0005] The present application aims to solve the problems in the background art and provides a high-frequency PCB board material dielectric constant online calibration and pressing device.

[0006] The present application provides a high-frequency PCB board material dielectric constant online calibration and pressing device, which includes a pressing machine body with a sealed chamber inside the mechanical shell, and further includes: A sealing partition plate is fixed to the inner wall of the pressing machine body on the upper side of the middle, used to seal the working area inside the pressing machine body to form a sealed chamber. A hydraulic cylinder is installed on the upper surface of the sealing partition plate. The output end of the hydraulic cylinder penetrates the sealing partition plate and is fixed with a lower pressing plate. The upper surface of the lower pressing plate is fixed with a guide rod that slides inside the sealing partition plate. An air extraction device is also installed on the upper side of the inner wall of the pressing machine body. A support seat is fixed to the lower side of the inner wall of the pressing machine body. Two sliding plates are connected to the inner wall of the support seat through sliding. Two multi-zone micro-heating array mechanisms are respectively arranged on the upper surface of the support seat and inside the lower pressing plate, and are used to regulate and control the local dielectric constant through local temperature control. The utility model relates to a calibration mechanism for measuring dielectric constant, which comprises a micro microwave resonant cavity sensor, a terahertz transmitter and a terahertz receiver, the micro microwave resonant cavity sensor is provided with four, one is arranged on the upper and lower sides of the outer wall of the two slide plates, the terahertz transmitter is installed in the middle of the multi-zone micro heating array mechanism inside the lower pressing plate, and the terahertz receiver is installed in the middle of the multi-zone micro heating array mechanism inside the support seat.

[0007] Optionally, the multi-zone micro heating array mechanism comprises a protective frame, a hot pressing plate, a heating actuator and a temperature sensor, the protective frame is installed inside the lower pressing plate and on the upper surface of the support seat, the hot pressing plate, the heating actuator and the temperature sensor are provided with a plurality of and the same number, the plurality of hot pressing plates are designed in clamping connection and are combined and installed on the inner wall of the protective frame, the plurality of heating actuators are arranged in parallel above the plurality of hot pressing plates, and the plurality of temperature sensors are arranged in parallel above the plurality of heating actuators.

[0008] Optionally, the pressing device further comprises, A positioning mechanism arranged inside the slide plate is used for driving the circuit board to be centrally positioned. The positioning mechanism comprises a bearing plate and a V-shaped limiting plate, the outer wall of the bearing plate is fixed on one side of the slide plate, the outer wall of the V-shaped limiting plate is arranged inside the slide plate, the inner wall of the V-shaped limiting plate is fixedly provided with a connecting ring, the inner wall of the connecting ring is rotatably provided with a sliding shaft, a torsion spring is arranged between the connecting ring and the sliding shaft, one end of the torsion spring is fixed to the inner wall of the connecting ring, and the other end is fixed to the outer wall of the sliding shaft, and the upper surface of the sliding shaft is fixedly provided with a rectangular limiting plate.

[0009] Optionally, the positioning mechanism further comprises a limiting block sliding in the sliding shaft, the lower surface of the limiting block is provided with an extension spring, a plurality of limiting holes are formed in the slide plate, and the outer wall of the limiting block is slidably arranged in the limiting hole.

[0010] Optionally, the V-shaped limiting plate is designed in a V shape and is used for abutting the top corner of the circuit board, and the rectangular limiting plate is designed in a rectangle and slides in the slide plate and is used for preventing the sliding shaft from rotating.

[0011] Optionally, the pressing device further comprises a driving mechanism arranged inside the pressing machine body and used for driving the slide plate to move. The driving mechanism comprises a first electric push rod fixed inside the pressing machine body, and two racks sliding inside the pressing machine body, the output end of the first electric push rod is fixedly connected with the outer wall of one of the racks, a gear is rotatably arranged in the middle part of the pressing machine body, the two racks are respectively engaged on the two sides of the outer wall of the gear, the end part of the two racks is fixedly connected with a connecting plate, and the connecting plate is connected with the sliding plate through a sliding column and a rectangular sliding plate sliding inside.

[0012] Optionally, the driving mechanism further comprises a guide rail for guiding the movement of the connecting plate, and an internal sliding block of the guide rail is fixedly connected to the lower surface of the connecting plate.

[0013] Optionally, the pressing device further comprises a lifting mechanism arranged inside the pressing machine body and used for driving the sliding plate to lift; The lifting mechanism comprises a second electric push rod fixed inside the pressing machine body, a connecting plate is fixedly connected to the output end of the second electric push rod, and four top corners are protruded from the outer wall of the connecting plate and fixedly connected with four rectangular sliding plates.

[0014] Optionally, the pressing device further comprises an automatic opening and closing mechanism arranged on one side of the outer wall of the pressing machine body and used for automatic opening and closing. The automatic opening and closing mechanism comprises a fixed frame sealingly arranged on one side of the outer wall of the pressing machine body, a third electric push rod is fixed to the outer wall of the fixed frame, a connecting steel cable is fixedly connected to the output end of the third electric push rod, a sealing baffle is fixedly connected to one end of the connecting steel cable, and the sealing baffle slides in the inner wall of the fixed frame.

[0015] Optionally, the rectangular sliding plate slides in the sliding column, and the connecting plate is designed to be telescopic.

[0016] In summary, the present application has at least one of the following beneficial technical effects: The present application realizes real-time sensing and dynamic regulation of the dielectric constant of the plate during the pressing process by integrating the terahertz online monitoring system and the multi-zone micro-heating array, changes the traditional blind pressing process into an intelligent process that can be calibrated online, and ensures the uniformity and consistency of product performance from the source.

[0017] Further, by accurately controlling the temperature difference of different regions of the plate, the dielectric constant fluctuation caused by uneven heat field, resin flow and other factors is effectively compensated, the stress and defects in the laminated plate are greatly reduced, the risk of warping and delamination of the plate is significantly reduced, and the final quality and production yield of the high-frequency PCB product are improved.

[0018] Finally, the automatic positioning, driving in and out of the material, automatic opening and closing sealing and vacuumizing functions are integrated, realizing the full-process automation from feeding, positioning, pressing and calibration to discharging, reducing human intervention, improving production efficiency, and ensuring the repeatability and reliability of the process. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The overall structure schematic diagram of the high-frequency PCB board dielectric constant online calibration and pressing device is given; Figure 2 The structure schematic diagram of one side of the automatic opening and closing mechanism is given; Figure 3 The internal structure schematic diagram of the pressing machine body is given; Figure 4 The structure schematic diagram of the upper structure of the support seat is given; Figure 5 The internal structure schematic diagram of the lower pressing plate is given; Figure 6 The structure schematic diagram of one side of the sliding plate is given; Figure 7 The structure schematic diagram of the lower structure of the support seat is given; Figure 8 The internal structure schematic diagram of the sliding plate is given; Figure 9 The sectional view schematic diagram of the V-shaped limiting plate is given; Figure 10 The structure schematic diagram of the automatic opening and closing mechanism is given.

[0020] The figure mark: 1, the pressing machine body; 2, the sealing partition; 3, the hydraulic cylinder; 4, the lower pressing plate; 5, the guide rod; 6, the support seat; 7, the multi-zone micro heating array mechanism; 701, the protection frame; 702, the hot pressing plate; 703, the heating actuator; 704, the temperature sensor; 8, the sliding plate; 9, the calibration mechanism; 901, the miniature microwave resonant cavity sensor; 902, the terahertz transmitter; 903, the terahertz receiver; 10, the positioning mechanism; 1001, the bearing plate; 1002, the V-shaped limiting plate; 1003, the engagement ring; 1004, the torsion spring; 1005, the sliding shaft; 1006, the rectangular limiting plate; 1007, the extension spring; 1008, the limiting block; 1009, the limiting hole; 11, the driving mechanism; 1101, the electric push rod one; 1102, the rack; 1103, the gear; 1104, the engagement plate; 1105, the guide rail; 1106, the sliding column; 1107, the rectangular sliding plate; 12, the lifting mechanism; 1201, the electric push rod two; 1202, the connecting plate; 13, the automatic opening and closing mechanism; 1301, the fixed frame; 1302, the sealing baffle; 1303, the engagement cable; 1304, the electric push rod three; 14, the vacuumizing device. DETAILED DESCRIPTION

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

[0022] like Figures 1-5 As shown, the present invention proposes an online calibration and pressing device for the dielectric constant of high-frequency PCB boards, comprising a pressing machine body 1 that provides the mounting base for all other components, withstands the enormous mechanical stress generated during the pressing process, and protects the internal precision mechanisms, and a sealing partition 2 fixed to the upper part of the inner wall of the pressing machine body 1 to seal the internal working area of ​​the pressing machine body 1, forming a sealed chamber; in one embodiment, a hydraulic cylinder 3 is installed on the upper surface of the sealing partition 2, the output end of the hydraulic cylinder 3 passes through the sealing partition 2 and is fixed with a lower pressure plate 4, a guide rod 5 is fixed on the upper surface of the lower pressure plate 4 and slides through the sealing partition 2, a vacuum device 14 is also installed on the upper side of the inner wall of the pressing machine body 1, and a support seat 6 is fixed on the lower side of the inner wall of the pressing machine body 1, with two sliding plates 8 slidably connected to the inner wall of the support seat 6. The pressing device is described in detail below: In this embodiment, the sealing partition 2 inside the pressing machine body 1 forms a sealed chamber, which is evacuated by the vacuum device 14 to provide a bubble-free environment for pressing. During pressing, the hydraulic cylinder 3 drives the lower pressure plate 4 to press down precisely along the guide rod 5.

[0023] like Figures 1-5 As shown, the pressing device also includes two multi-zone micro-heating array mechanisms 7 respectively disposed on the upper surface of the support base 6 and inside the lower pressure plate 4. In one embodiment, the multi-zone micro-heating array mechanism 7 includes a protective frame 701, a hot pressing plate 702, a heating actuator 703, and a temperature sensor 704. The protective frame 701 is installed inside the lower pressure plate 4 and on the upper surface of the support base 6. Several hot pressing plates 702, heating actuators 703, and temperature sensors 704 are provided in equal numbers. The hot pressing plates 702 are interlocked and assembled on the inner wall of the protective frame 701. Several heating actuators 703 are arranged parallel above the several hot pressing plates 702, and several temperature sensors 704 are arranged parallel above the several heating actuators 703. The multi-zone micro-heating array mechanism 7 is described in detail below: In this embodiment, the multi-zone micro-heating array mechanism 7 provided on the support base 6 applies pressure to the PCB board together with the lower pressing plate 4. The multiple hot pressing plates 702 in the protective frame 701 are combined in a clamping manner. Each hot pressing plate 702 unit is provided with a heating actuator 703 and a temperature sensor 704 above the hot pressing plate 702 in parallel, which together constitute an independent temperature control unit. The device can perform differential heating on different areas of the board. Through local temperature control, the resin flowability and curing process of the area are directly regulated, thereby actively regulating the local dielectric constant.

[0024] As shown in Figures 1-5 , the pressing device further includes a calibration mechanism 9 for measuring the dielectric constant. As an embodiment, the calibration mechanism 9 includes four miniature microwave resonant cavity sensors 901, a terahertz transmitter 902, and a terahertz receiver 903. One miniature microwave resonant cavity sensor 901 is provided on each of the upper and lower sides of the outer wall of the two sliding plates 8. The terahertz transmitter 902 is installed in the middle of the multi-zone micro-heating array mechanism 7 inside the lower pressing plate 4. The terahertz receiver 903 is installed in the middle of the multi-zone micro-heating array mechanism 7 inside the support base 6. The calibration mechanism 9 is described in detail below: In this embodiment, the terahertz transmitter 902 integrated in the lower pressing plate 4 sends a signal that is received by the terahertz receiver 903 located on the sliding plate after penetrating the board, realizing real-time, online, and penetrating measurement of the dielectric constant of the board, providing a data basis for closed-loop control. The miniature microwave resonant cavity sensor 901 performs pre-scanning before pressing to establish an initial distribution baseline of the dielectric constant.

[0025] As shown in Figure 1 , Figure 6 , Figure 7 , Figure 8 and Figure 9 , the pressing device further includes a positioning mechanism 10 provided inside the sliding plate 8 for driving the circuit board to be centrally positioned. As an embodiment, the positioning mechanism 10 includes a bearing plate 1001 and a V-shaped limiting plate 1002. The outer wall of the bearing plate 1001 is fixed to one side of the sliding plate 8. The outer wall of the V-shaped limiting plate 1002 is provided inside the sliding plate 8. The V-shaped limiting plate 1002 has a connecting ring 1003 fixed inside. A sliding shaft 1005 is rotatably provided on the inner wall of the connecting ring 1003. A torsion spring 1004 is provided between the connecting ring 1003 and the sliding shaft 1005. One end of the torsion spring 1004 is fixed to the inner wall of the connecting ring 1003, and the other end is fixed to the outer wall of the sliding shaft 1005. A rectangular limiting plate 1006 is fixed to the upper surface of the sliding shaft 1005. The positioning mechanism 10 further comprises a limiting block 1008 sliding in the sliding shaft 1005, and the lower surface of the limiting block 1008 is provided with an extension spring 1007. A plurality of limiting holes 1009 are formed in the sliding plate 8, and the outer wall of the limiting block 1008 slides in the limiting holes 1009; The V-shaped limiting plate 1002 is designed in a V shape and is used for abutting against the top corner of the circuit board. The rectangular limiting plate 1006 is designed in a rectangle and slides in the sliding plate 8 and is used for preventing the sliding shaft 1005 from rotating. The following will specifically explain the positioning mechanism 10: In this embodiment, first, the limiting block 1008 is pressed to slide in the sliding shaft 1005 and the limiting hole 1009 in the sliding plate 8. Thus, the extension spring 1007 is contracted. When the limiting block 1008 is completely moved into the sliding shaft 1005, the sliding shaft 1005 is pulled to slide in the sliding plate 8. Thus, the position of the V-shaped limiting plate 1002 can be adjusted so as to be adapted to different high-frequency PCB materials. When the V-shaped limiting plate 1002 is used, one of the top corners of the V-shaped limiting plate 1002 is moved under the pressure of the high-frequency PCB material. Thus, the V-shaped limiting plate 1002 drives the abutting ring 1003 to rotate on the outer wall of the sliding shaft 1005, and the torsion spring 1004 is twisted. When the V-shaped limiting plate 1002 is rotated to a certain angle, the two top corners of the V-shaped limiting plate 1002 are abutted against the outer wall of the high-frequency PCB material. Thus, the high-frequency PCB material is limited and positioned effectively.

[0026] As shown in Figure 1 , Figure 6 and Figure 7 , the pressing device further comprises a driving mechanism 11 arranged in the pressing machine body 1 and used for driving the sliding plate 8 to move. As an embodiment, the driving mechanism 11 comprises an electric push rod 1101 fixed in the pressing machine body 1 and two racks 1102 sliding in the pressing machine body 1. The output end of the electric push rod 1101 is fixedly connected with the outer wall of one of the racks 1102. A gear 1103 is rotatably arranged in the middle of the pressing machine body 1. The two racks 1102 are respectively engaged with the outer wall of the gear 1103 on both sides. The end portions of the two racks 1102 are fixedly connected with abutting plates 1104. The abutting plates 1104 are connected with the sliding plate 8 through a sliding column 1106 and a rectangular sliding plate 1107 sliding in the inside. The driving mechanism 11 further comprises guide rails 1105 guiding the movement of the abutting plates 1104. The sliding blocks in the guide rails 1105 are fixedly connected with the lower surfaces of the abutting plates 1104. The following will specifically explain the driving mechanism 11: In this embodiment, first drive electric push rod 1101 with rack 1102 in the press body 1 inside sliding, at the same time through the meshing relationship between rack 1102 and gear 1103, make gear 1103 drive both sides of the rack 1102 relative movement, thus through the interface plate 1104 with sliding column 1106 and rectangular sliding plate 1107 drive sliding plate 8 relative movement, and then through the movement of sliding plate 8 drive positioning mechanism 10 and bearing plate 1001 to high frequency PCB board material for clamping and lifting.

[0027] As shown in Figure 1 , Figure 6 and Figure 7 , the press device also includes setting in the press body 1 inside, for driving sliding plate 8 lifting lifting mechanism 12, as a kind of embodiment, lifting mechanism 12 includes fixed in the press body 1 inside electric push rod two 1201, electric push rod two 1201 output end fixedly connected with connecting plate 1202, the outer wall of connecting plate 1202 protrudes four top corners, and is fixedly connected with four rectangular sliding plate 1107; Rectangular sliding plate 1107 slides in sliding column 1106, and connecting plate 1202 is designed to be retractable, the lifting mechanism 12 is specifically described as follows: In this embodiment, after high frequency PCB board material is lifted, start electric push rod two 1201 drive connecting plate 1202 up and down movement and then through rectangular sliding plate 1107 drive sliding plate 8 and high frequency PCB board material up and down movement, when high frequency PCB board material is lifted, it can be conveniently detected by miniature microwave resonant cavity sensor 901.

[0028] As shown in Figure 1 , Figure 2 and Figure 10 , the press device also includes setting in the press body 1 outer wall one side, for automatic opening and closing automatic opening and closing mechanism 13, as a kind of embodiment, automatic opening and closing mechanism 13 includes sealingly installed in the press body 1 outer wall one side fixed frame 1301, fixed frame 1301 outer wall is fixed with electric push rod three 1304, electric push rod three 1304 output end fixedly connected with the connecting steel cable 1303, the connecting steel cable 1303 one end fixedly connected with sealing baffle 1302, sealing baffle 1302 slides in fixed frame 1301 inner wall, automatic opening and closing mechanism 13 is specifically described as follows: In this embodiment, start electric push rod three 1304 drive the connecting steel cable 1303 one end movement, thus through the other end of the connecting steel cable 1303 drive sealing baffle 1302 in the inner wall of fixed frame 1301 sliding, and then realize the automatic control of sealing baffle 1302.

[0029] The above specific embodiments are only several optional embodiments of the present application, and based on the technical scheme of the present application and the related inspiration of the above embodiments, the person skilled in the art can make various alternative improvements and combinations on the above specific embodiments.

Claims

1. A high-frequency PCB board material dielectric constant on-line calibration pressing device, comprising a press body (1) provided with a sealed chamber in the inside of a device mechanical shell, characterized in that, Also include: The sealing partition (2) is fixed in the upper side of the inner wall of the pressing machine body (1), which is used for sealing the working area of the pressing machine body (1), and forms a sealed chamber. The upper surface of the sealing partition (2) is provided with a hydraulic cylinder (3), the output end of the hydraulic cylinder (3) penetrates the sealing partition (2) and is fixed with a pressing plate (4), the upper surface of the pressing plate (4) is fixed with a guide rod (5) which slides in the sealing partition (2), the upper side of the inner wall of the pressing machine body (1) is also provided with a vacuumizing device (14), the lower side of the inner wall of the pressing machine body (1) is fixed with a supporting seat (6), the inner wall of the supporting seat (6) is slidably connected with two sliding plates (8); Two multi-zone micro-heating array mechanisms (7) are arranged on the upper surface of the supporting seat (6) and the inside of the pressing plate (4), respectively, and the local dielectric constant is adjusted by local temperature control; The calibration mechanism (9) is used for measuring the dielectric constant, and the calibration mechanism (9) comprises a miniature microwave resonant cavity sensor (901), a terahertz transmitter (902) and a terahertz receiver (903). The miniature microwave resonant cavity sensor (901) is provided with four, one of which is arranged on the outer wall of the two sliding plates (8) on the upper and lower sides, the terahertz transmitter (902) is installed in the middle of the multi-zone micro-heating array mechanism (7) inside the pressing plate (4), and the terahertz receiver (903) is installed in the middle of the multi-zone micro-heating array mechanism (7) inside the supporting seat (6).

2. The high-frequency PCB board dielectric constant online calibration pressing device according to claim 1, characterized in that, The multi-zone micro-heating array mechanism (7) comprises a protective frame (701), a hot pressing plate (702), a heating actuator (703) and a temperature sensor (704). The protective frame (701) is installed in the inside of the pressing plate (4) and the upper surface of the supporting seat (6). The hot pressing plate (702), the heating actuator (703) and the temperature sensor (704) are provided with a plurality of and the same number. A plurality of the hot pressing plates (702) are designed to be connected in a clamping manner, and are combined and installed on the inner wall of the protective frame (701). A plurality of the heating actuators (703) are arranged in parallel above a plurality of the hot pressing plates (702). A plurality of the temperature sensors (704) are arranged in parallel above a plurality of the heating actuators (703).

3. The high-frequency PCB board dielectric constant online calibration press-bonding device according to claim 1, characterized in that, The pressing device also comprises a positioning mechanism (10) arranged in the inside of the sliding plate (8) for driving the circuit board to be positioned centrally. The positioning mechanism (10) comprises a bearing plate (1001) and a V-shaped limiting plate (1002), the outer wall of the bearing plate (1001) is fixed on one side of the sliding plate (8), the outer wall of the V-shaped limiting plate (1002) is arranged inside the sliding plate (8), the inside of the V-shaped limiting plate (1002) is fixedly connected with a connecting ring (1003), the inner wall of the connecting ring (1003) is rotatably connected with a sliding shaft (1005), a torsion spring (1004) is arranged between the connecting ring (1003) and the sliding shaft (1005), one end of the torsion spring (1004) is fixedly connected with the inner wall of the connecting ring (1003), and the other end is fixedly connected with the outer wall of the sliding shaft (1005), and the upper surface of the sliding shaft (1005) is fixedly connected with a rectangular limiting plate (1006).

4. The high-frequency PCB board dielectric constant online calibration pressing device according to claim 3, characterized in that, The positioning mechanism (10) further comprises a limiting block (1008) sliding in the sliding shaft (1005), the lower surface of the limiting block (1008) is provided with an extension spring (1007), a plurality of limiting holes (1009) are formed in the sliding plate (8), and the outer wall of the limiting block (1008) is slidingly arranged in the limiting hole (1009).

5. The high-frequency PCB board material dielectric constant online calibration pressing device according to claim 4, characterized in that, The V-shaped limiting plate (1002) is designed in a V shape and is used for fitting the top corner of the circuit board, the rectangular limiting plate (1006) is designed in a rectangular shape and is slidingly arranged in the sliding plate (8), and is used for preventing the sliding shaft (1005) from rotating.

6. The high-frequency PCB board material dielectric constant online calibration pressing device according to claim 1, characterized in that, The pressing device further comprises a driving mechanism (11) arranged in the pressing machine body (1) and used for driving the sliding plate (8) to move; The driving mechanism (11) comprises an electric push rod (1101) fixedly connected with the inside of the pressing machine body (1), and two racks (1102) sliding in the pressing machine body (1), the output end of the electric push rod (1101) is fixedly connected with the outer wall of one of the racks (1102), a gear (1103) is rotatably arranged in the middle of the pressing machine body (1), the two racks (1102) are respectively arranged on the two sides of the outer wall of the gear (1103), the end portions of the two racks (1102) are fixedly connected with connecting plates (1104), and the connecting plates (1104) are connected with the sliding plate (8) through sliding columns (1106) and rectangular sliding plates (1107) sliding in the inside.

7. The high-frequency PCB board material dielectric constant online calibration pressing device according to claim 6, characterized in that, The driving mechanism (11) further comprises guide rails (1105) for guiding the movement of the connecting plates (1104), and the sliding blocks in the guide rails (1105) are fixedly connected with the lower surfaces of the connecting plates (1104).

8. The high-frequency PCB board material dielectric constant online calibration pressing device according to claim 7, characterized in that, The pressing device further comprises a lifting mechanism (12) arranged in the pressing machine body (1) and used for driving the sliding plate (8) to lift; The lifting mechanism (12) comprises an electric push rod (1201) fixedly connected with the inside of the pressing machine body (1), the output end of the electric push rod (1201) is fixedly connected with a connecting plate (1202), and the outer wall of the connecting plate (1202) protrudes four corners and is fixedly connected with four rectangular sliding plates (1107).

9. The high-frequency PCB board material dielectric constant online calibration pressing device according to claim 1, characterized in that, The pressing device further comprises an automatic opening and closing mechanism (13) arranged on one side of the outer wall of the pressing machine body (1) and used for automatically opening and closing; The automatic opening and closing mechanism (13) comprises a fixed frame (1301) sealingly arranged on one side of the outer wall of the pressing machine body (1), a third electric push rod (1304) fixedly arranged on the outer wall of the fixed frame (1301), an adapter steel cable (1303) fixedly connected to the output end of the third electric push rod (1304), and a sealing baffle (1302) fixedly connected to one end of the adapter steel cable (1303) and sliding on the inner wall of the fixed frame (1301).

10. The high-frequency PCB board material dielectric constant online calibration pressing device according to claim 8, characterized in that, The rectangular sliding plate (1107) slides in the sliding column (1106), and the connecting plate (1202) is designed to be retractable.

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