CN111969294A - Transmission part device for testing electromagnetic wave absorption performance of building material - Google Patents
Transmission part device for testing electromagnetic wave absorption performance of building material Download PDFInfo
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- CN111969294A CN111969294A CN202010897120.1A CN202010897120A CN111969294A CN 111969294 A CN111969294 A CN 111969294A CN 202010897120 A CN202010897120 A CN 202010897120A CN 111969294 A CN111969294 A CN 111969294A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 49
- 238000012360 testing method Methods 0.000 title claims abstract description 28
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 16
- 239000004566 building material Substances 0.000 title claims abstract description 14
- 238000006073 displacement reaction Methods 0.000 claims description 33
- 239000011358 absorbing material Substances 0.000 claims description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 20
- 229910052782 aluminium Inorganic materials 0.000 claims description 20
- 229920006351 engineering plastic Polymers 0.000 claims description 9
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- 238000000034 method Methods 0.000 description 10
- 230000005670 electromagnetic radiation Effects 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
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- H01Q1/12—Supports; Mounting means
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0878—Sensors; antennas; probes; detectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
- H01Q3/04—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying one co-ordinate of the orientation
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Abstract
The invention relates to the technical field of environmental protection, in particular to a transmission part device for testing the electromagnetic wave absorption performance of a building material.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a transmission part device for testing the electromagnetic wave absorption performance of a building material.
Background
Electromagnetic radiation is invisible, colorless, odorless and silent, has no perception to people but has potential huge harm, and is an important pollution source which greatly influences the physical health of residents after waste water, waste gas, solid waste and noise pollution. The application of the building material for absorbing electromagnetic waves can effectively control or reduce the background intensity of electromagnetic radiation in a building space and reduce the harm of the electromagnetic radiation. The method for testing the electromagnetic wave absorption performance of building materials mainly comprises methods of bow, waveguide, coaxial and the like, wherein the bow method is suitable for testing the electromagnetic wave absorption performance of the building materials in the frequency range of 1 GHz-40 GHz, the waveguide method is suitable for 600 MHz-1 GHz, the coaxial method is suitable for 30 MHz-600 MHz, the three methods except for different testing frequency ranges and hardware structures use a vector network analyzer, the output end and the input end of the vector network analyzer in a bow method testing system are respectively connected with a transmitting antenna horn and a receiving antenna horn, the transmitting antenna horn and the receiving antenna horn are respectively arranged on mirror symmetry positions on two sides of a vertical central line of a bow frame, the horizontal center of a building material electromagnetic wave absorption performance sample is coincided with the center of the bow frame, a part of electromagnetic waves emitted by the transmitting antenna horn after reaching the building material electromagnetic wave absorption performance sample is reflected to the receiving antenna horn, the receiving antenna horn obtains the measured value and the curve of the reflection coefficient of the performance sample of the building material for absorbing the electromagnetic wave, and the measured value and the curve are related to the angle between the transmitting antenna horn and the receiving antenna horn and are also related to the radius of the bow-shaped frame and the area change of the performance sample of the building material for absorbing the electromagnetic wave. At present, the mobile adjustment of the transmitting antenna loudspeaker and the receiving antenna loudspeaker on the bow-shaped frame is respectively fixed through mobile adjustment, the mutual mirror symmetry of the transmitting antenna loudspeaker and the receiving antenna loudspeaker on the bow-shaped frame is verified after each adjustment, a large amount of time can be wasted, and meanwhile, the mutual mirror symmetry of the transmitting antenna and the receiving antenna on the bow-shaped frame cannot be guaranteed, so that the testing quality and the testing efficiency are influenced.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide a transmission part device for testing the electromagnetic wave absorption performance of a building material.
The invention is realized by the following technical scheme:
a transmission part device for testing the electromagnetic wave absorption performance of building materials comprises a transmitting antenna horn, a receiving antenna horn and an arch-shaped frame, wherein the arch-shaped frame is divided into a semi-arc section and two vertical sections, the two vertical sections are respectively connected with the two lower ends of the semi-arc section, and the two vertical sections are respectively fixed on the ground through foundation bolts; wave-absorbing materials are arranged on the ground below the semicircular arc section; a nut pipe is fixed on the ground corresponding to the vertical central line of the semicircular arc section, a screw rod is screwed in the nut pipe, a small square horizontal plate is fixed at the top of the screw rod, the vertical central line of the small square horizontal plate is superposed with the vertical central line of the semicircular arc section, an aluminum square standard plate is placed above the small square horizontal plate, and a wave-absorbing material sample with the same size as the aluminum square standard plate is placed above the aluminum square standard plate; the semi-arc section is a semicircular open slot with an upward opening, the cross section of the semi-arc section is a rectangular slot, two side edges of the top of the semi-arc section are respectively provided with an outer arc rack, two side edges of the lower end of the semi-arc section are respectively provided with an inner arc rack, two parallel sliding chutes are distributed at the inner bottom of the semi-arc section along the direction of the semi-arc section, one of the sliding chutes is internally provided with a left arc sliding rack, the other sliding chute is internally provided with a right arc sliding rack, the lengths of the left arc sliding rack and the right arc sliding rack are respectively half of the arc length of the semi-arc section, one end of each of the left arc sliding rack and the right arc sliding rack is upwards fixed with a vertical rod shaft sleeve, the other end of each of the vertical rod shaft sleeve and the positioning baffle is upwards fixed with a positioning baffle, the vertical rod shaft sleeve and the positioning baffle, The two positioning baffles are arranged in mirror symmetry about the vertical center line of the semicircular arc section; a frame A and a frame B are respectively fixed on the left side and the right side of the semicircular arc section, the frame A and the frame B are arranged in mirror symmetry relative to the vertical center line of the semicircular arc section, two parallel upper shafts A are respectively penetrated on the upper parts of the frame A and the frame B, two parallel lower shafts A are respectively penetrated on the lower parts of the frame A and the frame B, two upper gears A are arranged on each upper shaft A, two lower gears A are arranged on each lower shaft A, the upper gears A are respectively meshed with outer circular arc racks on the two sides of the semicircular arc section, and vertical rod shaft sleeves on the left circular arc sliding rack and the right circular arc sliding rack are respectively fixed with the corresponding upper shafts A; the lower ends of the frame A and the frame B are respectively provided with a receiving antenna horn and a transmitting antenna horn, the axial center lines of the receiving antenna horn and the transmitting antenna horn pass through the circle center of the semicircular arc section, a CMOS laser displacement sensor A and a CMOS laser displacement sensor B are respectively arranged right in front of or right behind the receiving antenna horn and the transmitting antenna horn, a laser beam emitted by the CMOS laser displacement sensor A is parallel to the axial center line of the receiving antenna horn, a laser beam emitted by the CMOS laser displacement sensor B is parallel to the axial center line of the transmitting antenna horn, the receiving antenna horn and the transmitting antenna horn are in mirror symmetry about the vertical center line of the semicircular arc section, and the CMOS laser displacement sensor A and the CMOS laser displacement sensor B are also in mirror symmetry about the vertical center line of the semicircular arc section; a transmission device is arranged in the middle of the semicircular section, the transmission device comprises a driving shaft and a driven shaft which penetrate through two sides of the semicircular section and are parallel, a driving gear and a left transmission gear are arranged on the driving shaft in the rectangular groove through keys, the left transmission gear is meshed with a left circular arc sliding rack, the driving gear is meshed with the driven gear, the driven gear is fixed on the driven shaft through keys, a right transmission gear is fixed on the driven shaft through keys, the right transmission gear is meshed with a right circular arc sliding rack, one end of the driving shaft is fixed with a hand wheel through a nut, an elastic rubber circular arc pressing block is arranged right above the hand wheel, a vertical push rod is connected above the elastic rubber circular arc pressing block, the vertical push rod upwards penetrates through a hole in a horizontal fixed rod C, the other end of the horizontal fixed rod C is fixed on a vertical fixed plate, the vertical fixed plate is fixed on, the other end of the movable rod is hinged with the rotating rod through a short shaft B, a spherical wrench is arranged on the rotating rod, the other end of the rotating rod is hinged with a horizontal fixing rod A through a short shaft A, the other end of the horizontal fixing rod A is fixed on the vertical fixing plate, and the elastic rubber arc pressing block can leave or press the hand wheel by the upward or downward movement of the spherical wrench; the hand wheel rotates and drives the driving shaft to rotate, the driving shaft drives the driving gear and the driven gear to synchronously rotate, the driving gear drives the left transmission gear to synchronously rotate, the left transmission gear is meshed with the left arc sliding rack to enable the left arc sliding rack to move, the driven gear drives the driven shaft to synchronously rotate, the driven shaft drives the right transmission gear to synchronously rotate, the right transmission gear is meshed with the right arc sliding rack to enable the right arc sliding rack to move, and the moving directions of the left arc sliding rack and the right arc sliding rack are opposite.
Furthermore, the bow-shaped frame is made of glass fiber reinforced plastics or engineering plastics, the foundation bolts are made of engineering plastics, and the nut pipe, the screw rod and the small square horizontal plate are all made of engineering plastics.
Further, the radius of the semicircular arc section is 900 mm.
Furthermore, the wave-absorbing material is a conical wave-absorbing material.
Further, the side length of the aluminum square standard plate is 500mm or 300mm or 180 mm.
The invention has the beneficial effects that: the structural arrangement of the invention ensures that the mirror symmetry positions of the transmitting antenna horn and the receiving antenna horn are always kept in the testing process, manual repeated adjustment is not needed, the accuracy of the electromagnetic wave absorption performance of the test wave-absorbing material sample is ensured, and the testing efficiency is greatly improved.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is an enlarged view of a-a section of fig. 1.
Fig. 3 is an enlarged view of a section B-B of fig. 1.
Fig. 4 is a top view of fig. 3.
Fig. 5 is a view of the vertical rod shaft sleeve and the positioning baffle on the left arc sliding rack.
Fig. 6 is a top view of the small square horizontal plate of fig. 1.
Fig. 7 is a state diagram in which the left arc sliding rack slides rightward.
Fig. 8 is another state view of the left circular arc sliding rack sliding rightward.
In the figure, 1 ground, 2 anchor bolts, 3 vertical sections, 4 semicircular sections, 5 outer circular arc racks, 6 inner circular arc racks, 7 receiving antenna horns, 8 lower gears A, 9 lower shafts A, 10 upper shafts A, 11 upper gears A, 12 frames A, 13 handwheels, 14 elastic rubber circular arc pressing blocks, 15 spherical wrenches, 16 driven shafts, 17 frames B, 18 transmitting antenna horns, 19CMOS laser displacement sensors A, 20CMOS laser displacement sensors B, 21 wave-absorbing material samples, 22 aluminum square standard plates, 23 small square horizontal plates, 24 lead screws, 25 nut tubes, 26 wave-absorbing materials, 27 electromagnetic wave transmitting cables, 28 vector network analyzers, 29 electromagnetic wave receiving cables, 30 central lines A, 32 positioning rings, 33 rectangular grooves, 34 sliding grooves, 35 right circular arc sliding racks, 36 left circular arc sliding racks, 37 driving shafts, 38 driving gears and 40 right driving gears, 41 left transmission gear, 42 vertical fixing plate, 44 horizontal fixing rod A, 45 short shaft A, 46 rotating rod, 47 short shaft B, 48 moving rod, 49 short shaft C, 50 horizontal fixing rod C, 51 vertical push rod, 54 driven gear, 55 vertical rod shaft sleeve and 56 positioning baffle.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The invention comprises an arc-shaped frame for fixing a transmitting antenna horn 18 and a receiving antenna horn 7, wherein the arc-shaped frame is divided into a semi-arc section 4 and two vertical sections 3, the radius of the semi-arc section 4 is 900mm, the two vertical sections 3 are respectively connected with the two lower ends of the semi-arc section 4, and can be fixedly connected or integrally connected, and the two vertical sections 3 are respectively fixed on the ground 1 through foundation bolts 2. In order to avoid interference to electromagnetic waves in the test process, the arch-shaped frame is preferably made of non-metallic insulating material glass fiber reinforced plastics or engineering plastics with small reflection to the electromagnetic waves, and the foundation bolts 2 are made of engineering plastics.
And a wave absorbing material 26, preferably a conical wave absorbing material, is arranged on the ground 1 below the semicircular arc section 4. A nut pipe 25 is fixed on the ground 1 corresponding to the vertical central line of the semicircular arc section 4, a screw rod 24 is screwed in the nut pipe 25, a small square horizontal plate 23 is fixed at the top of the screw rod 24, similarly, in order to avoid interference to electromagnetic waves, the nut pipe 25, the screw rod 24 and the small square horizontal plate 23 are all made of engineering plastics, and the small square horizontal plate 23 is preferably made of glass steel. The vertical center line of little square horizontal plate 23 and the coincidence of the vertical center line of semicircle section 4, need little square horizontal plate 23 upper surface central point and the coincidence of the centre of a circle of semicircle section 4 during the test, little square horizontal plate 23 height can be adjusted, thereby through rotatory little square horizontal plate 23 rotatory lead screw 24, lead screw 24 rotates in screw pipe 25, thereby adjust the vertical height of little square horizontal plate 23, during the test with little square horizontal plate 23 highly transfer its upper surface center to just with the coincidence of the centre of a circle of semicircle section 4 can. An aluminum square standard plate 22 is placed above the small square horizontal plate 23, a wave absorbing material sample 21 with the same size as the aluminum square standard plate 22 is placed above the aluminum square standard plate 22, the side length specifications of the aluminum square standard plate 22 are three, namely 500mm, 300mm and 180mm, and the thickness of the aluminum square standard plate is 5 mm. Wherein the side length of 500mm is suitable for 1-8 GHz, the side length of 300mm is suitable for 2-18 GHz, and the side length of 180mm is suitable for 6-40 GHz. The aluminum square standard plate 22 is placed on the small liftable square horizontal plate 23 to provide an ideal reflecting surface for the wave-absorbing material sample 21.
The semicircular arc section 4 is a semicircular open slot with an upward opening, the cross section of the semicircular arc section 4 is a rectangular slot 33, referring to fig. 2, two side edges of the top of the semicircular arc section 4 are both provided with outer circular arc racks 5, and the two outer circular arc racks 5 are arranged along the two side edges of the top of the semicircular arc section 4 and are matched with the two side edges of the top. The two side edges of the lower end of the semicircular section 4 are respectively provided with an inner circular arc rack 6, and the two inner circular arc racks 6 are arranged along the two side edges of the lower end and are matched with the two side edges of the lower end in shape. The outer circular arc rack 5 and the inner circular arc rack 6 are fixed racks which cannot slide, can be integrally manufactured with the semicircular arc section 4, and can also be fixed on the upper and lower side edges of the semicircular arc section 4 at a later stage. Two parallel semi-arc sliding grooves 34 are distributed at the inner bottom of the semi-arc section 4, namely the inner bottom of the rectangular groove 33 along the direction of the semi-arc section 4, and the length of the sliding grooves 34 is equal to or close to the arc length of the semi-arc section 4. A left arc sliding rack 36 is arranged in one sliding chute 34, a right arc sliding rack 35 is arranged in the other sliding chute 34, the left arc sliding rack 36 and the right arc sliding rack 35 are racks which can slide in the sliding chute 34, and the lengths of the left arc sliding rack 36 and the right arc sliding rack 35 are only half of the arc length of the semicircular arc section 4. A vertical rod shaft sleeve 55 is upwards fixed at one end of the left arc sliding rack 36, the vertical rod shaft sleeve 55 is formed by fixing a vertical rod on the left arc sliding rack 36, then a shaft sleeve group is fixed at the top end of the vertical rod to form the vertical rod shaft sleeve 55, and a positioning baffle plate 56 is upwards fixed at the other end of the left arc sliding rack 36. The vertical rod shaft sleeve 55 on the left circular arc sliding rack 36 is located on the left side of the transmission device in the middle of the semicircular arc section 4, which will be described in detail below, and the positioning baffle 56 on the left circular arc sliding rack 36 is located on the right side of the transmission device. Similarly, a vertical rod shaft sleeve 55 is also fixed upwards at one end of the right circular arc sliding rack 35, a positioning baffle 56 is fixed upwards at the other end, the vertical rod shaft sleeve 55 on the right circular arc sliding rack 35 is positioned at the right side of the transmission device, and the positioning baffle 56 is positioned at the left side of the transmission device.
A frame a12 and a frame B17 are fixed to the left and right sides of the semicircular arc segment 4, respectively, and the frame a12 and the frame B17 are mirror-symmetrical with respect to the vertical center line of the semicircular arc segment 4, and therefore, only the structure on the left side will be described below since both side structures are mirror-symmetrical with respect to the vertical center line of the semicircular arc segment 4. Referring to fig. 1, a frame a12 is fixed on the periphery of the semicircular segment 4, two parallel upper shafts a10 are inserted into the upper portion of the frame a12, two parallel lower shafts a9 are inserted into the lower portion of the frame a12, and the upper shafts a10 and the lower shafts a9 are fixed integrally with the frame a 12. Two upper gears A11 are arranged on each upper shaft A10 through a shaft elastic collar, two lower gears A8 are arranged on each lower shaft A9 through a shaft elastic collar, so that the four upper gears A11 are respectively meshed with the outer arc racks 5 on two sides, the four lower gears A8 are respectively meshed with the inner arc racks 6 on two sides, positioning rings 32 are arranged on the upper gears A11 and the lower gears A8, and the positioning rings 32 are used for positioning the gears on the racks. Thus the frame a12 can be moved along the semi-circular arc segment 4 by means of a gear and rack engagement. The upright sleeve 55 on the left arc sliding rack 36 is sleeved on any upper shaft a10 of the frame a12 and connected with any upper shaft a10, and the frame a12 and the left arc sliding rack 36 are connected into a whole through the upright sleeve 55, so that when the left arc sliding rack 36 slides in the sliding groove 34, the frame a12 is driven to move along the semi-arc section 4. The vertical rod shaft sleeve 55 and the positioning baffle 56 are respectively blocked by the transmission device when moving to the limit position, so that the left arc sliding rack 36 cannot be separated from the transmission device when moving to any direction, and the vertical rod shaft sleeve 55 and the positioning baffle 56 have a limiting effect.
A receiving antenna horn 7 is arranged in the middle of the lower end of the frame A12, a CMOS laser displacement sensor A19 is arranged right in front of or right behind the receiving antenna horn 7, that is, the CMOS laser displacement sensor a19 is installed in the direction perpendicular to the inward or outward direction of fig. 1, the axial center line of the receiving antenna horn 7 passes through the center of the semicircular arc segment 4, the laser beam emitted by the CMOS laser displacement sensor a19 is parallel to the axial center line of the receiving antenna horn 7, when the center of the upper surface of the small square horizontal plate 23 is located at the center of the semi-circular arc segment 4, the laser beam emitted by the CMOS laser displacement sensor a19 intersects with the connecting line of the front center point and the rear center point of the upper surface of the small square horizontal plate 23, this line is referred to herein as centerline A30, where front to back is defined as back in a direction perpendicular to the inward direction of FIG. 1 and front in a direction perpendicular to the outward direction of FIG. 1, see FIG. 6.
The right arc sliding rack 35 and the left arc sliding rack 36 are symmetrically arranged in a mirror image structure, the frame B17 is symmetrically arranged in a mirror image structure as the frame A12, and the difference is that the transmitting antenna horn 18 and the CMOS laser displacement sensor B20 are arranged below the frame B17. The CMOS laser displacement sensor a19 and the CMOS laser displacement sensor B20 are also mirror-image symmetrically arranged. Similarly, the axial center line of the transmitting antenna horn 18 passes through the center of the semicircular arc section 4, the laser beam emitted by the CMOS laser displacement sensor B20 is parallel to the axial center line of the transmitting antenna horn 18, and the laser beam emitted by the CMOS laser displacement sensor B20 intersects with the center line a30, and when the center of the upper surface of the small square horizontal plate 23 is located at the center of the semicircular arc section 4, the laser beam emitted by the CMOS laser displacement sensor a19 and the laser beam emitted by the CMOS laser displacement sensor B20 intersect at a point on the center line a30, so that the height of the small square horizontal plate 23 can be adjusted according to this, and the center of the upper surface is located at the center of the semicircular arc section 4.
The semicircular arc section 4 provides a semicircular arc sliding track for the transmitting antenna horn 18 and the receiving antenna horn 7, so that the transmitting antenna horn 18 and the receiving antenna horn 7 are located in a far field region relative to the tested wave-absorbing material sample 21, and meanwhile, the angle positions of the transmitting antenna horn 18 and the receiving antenna horn 7 are symmetrical, and the electromagnetic wave incident angle and the reflection angle are ensured to be symmetrical relative to the vertical central line of the small square horizontal plate 23.
A transmission device is arranged at the center of the semicircular arc section 4, namely at the position of the vertical center line of the semicircular arc section 4, namely the transmission device is arranged at the middle part of the semicircular arc section 4, and please refer to fig. 1, fig. 3 and fig. 4, and the transmission device is described in detail below: the transmission device comprises a driving shaft 37, the driving shaft 37 penetrates through two sides of the semicircular arc section 4, two ends of the driving shaft 37 are fixed with the semicircular arc section 4 through elastic check rings for shafts, and a shaft shoulder is arranged at one end of the driving shaft 37 for positioning. A driving gear 38 and a left transmission gear 41 are mounted on a driving shaft 37 in the rectangular groove 33 through keys, the left transmission gear 41 is meshed with a left arc sliding rack 36, the driving gear 38 is meshed with a driven gear 54, the driven gear 54 is fixed on a driven shaft 16 through keys, the driven shaft 16 is parallel to the driving shaft 37, a right transmission gear 40 is fixed on the driven shaft 16 through keys, the right transmission gear 40 is meshed with a right arc sliding rack 35, a shoulder is arranged at one end of the driven shaft 16 for positioning, and the other end of the driven shaft 16 is fixed through an elastic retaining ring for a shaft. A hand wheel 13 is fixed at one end of a driving shaft 37 through a nut, an elastic rubber arc pressing block 14 is arranged right above the hand wheel 13, a vertical push rod 51 is connected above the elastic rubber arc pressing block 14, the vertical push rod 51 upwards penetrates through a hole in a horizontal fixing rod C50, the other end of the horizontal fixing rod C50 is fixed on a vertical fixing plate 42, the vertical fixing plate 42 is fixed on the side face of a semicircular arc section 4 through a screw, the top of the vertical push rod 51 is hinged with a moving rod 48 through a short shaft C49, the other end of the moving rod 48 is hinged with a rotating rod 46 through a short shaft B47, a spherical wrench 15 is arranged on the rotating rod 46, the other end of the rotating rod 46 is hinged with a horizontal fixing rod A44 through a short shaft A45, the other end of the horizontal fixing rod A44 is fixed on the vertical fixing plate 42. When one hand holds the ball wrench 15 to move upwards, the vertical push rod 51 moves upwards, the elastic rubber arc pressing block 14 on the vertical push rod 51 also moves upwards, the hand wheel 13 can be rotated by the other hand at the moment, the ball wrench 15 moves downwards after the rotation is finished, and the hand wheel 13 is pressed and held by the elastic rubber arc pressing block 14 again. When the hand wheel 13 rotates, the driving shaft 37 also rotates, and the left circular arc sliding rack 36 engaged with the left transmission gear 41 on the driving shaft 37 starts to move, so that the frame a12 connected to the left circular arc sliding rack 36 also starts to move, and the receiving antenna horn 7 fixed below the frame a12 also moves synchronously. At the same time, the driving gear 38 on the driving shaft 37 is engaged with the driven gear 54 to synchronously rotate, the driven gear 54 is fixed on the driven shaft 16, and the right circular arc sliding rack 35 engaged with the right transmission gear 40 on the driven shaft 16 moves in the direction opposite to the left circular arc sliding rack 36, so that the frame B17 connected to the right circular arc sliding rack 35 also moves in the direction opposite to the frame a12, and the transmitting antenna horn 18 fixed below the frame B17 also synchronously moves. The diameters and the moduli of the driving gear 38, the driven gear 54, the left transmission gear 41 and the right transmission gear 40 are the same, and the moduli of the left arc sliding rack 36 and the right arc sliding rack 35 are respectively the same as the moduli of the left transmission gear 41 and the right transmission gear 40, so that the transmitting antenna horn 18 and the receiving antenna horn 7 always move in opposite directions when the hand wheel 13 rotates, and mirror symmetry positions are always kept, thereby ensuring the accuracy and the efficiency of the performance of the test wave-absorbing material sample 21 for absorbing electromagnetic waves.
The using method comprises the following steps: the vector network analyzer 28 is connected with the transmitting antenna horn 18 through the electromagnetic wave transmitting cable 27, is connected with the receiving antenna horn 7 through the electromagnetic wave receiving cable 29, starts the CMOS laser displacement sensor A19 and the CMOS laser displacement sensor B20, adjusts the height of the small square horizontal plate 23 according to the intersection point of the laser beams of the CMOS laser displacement sensor A19 and the CMOS laser displacement sensor B20, rotates the small square horizontal plate 23 to enable the screw rod 24 to move along the vertical direction of the nut tube 25, adjusts the height of the small square horizontal plate 23 to enable the intersection point of the laser beams of the CMOS laser displacement sensor A19 and the CMOS laser displacement sensor B20 to be positioned on the central line A30, and then represents that the central point of the upper surface of the small square horizontal plate 23 is positioned at the center of the semi-arc section 4, then uses one hand to hold the spherical spanner 15 to move upwards to enable the elastic rubber arc pressing block 14 not to press the hand, the other hand turns the hand wheel 13 to move the frame a12 and the frame B17 to the desired symmetrical angle, and then moves the ball wrench 15 downward so that the elastic rubber arc pressing piece 14 presses the hand wheel 13 again. At this time, the vector network analyzer 28 is started to set the testing frequency range of the wave-absorbing material sample 21, and the aluminum square standard plate 22 is placed on the small square horizontal plate 23. The vector network analyzer 28 checks the calibration result by testing the aluminum square standard plate 22, wherein the electromagnetic wave reflectivity of the aluminum square standard plate 22 should be within ± 0.5dB, then the wave-absorbing material sample 21 is placed on the aluminum square standard plate 22 and aligned and superposed with the edge of the aluminum square standard plate, the transmitting antenna horn 18 sends out electromagnetic waves with set frequency, the receiving antenna horn 7 receives the electromagnetic waves reflected by the wave-absorbing material sample 21, the vector network analyzer 28 analyzes the numerical value and curve of the wave-absorbing performance of the wave-absorbing material sample 21 along with the frequency change, and the test result is obtained when the curve is stable.
The transmitting antenna horn 18 and the receiving antenna horn 7 both adopt gear and rack transmission, mirror symmetry of the transmitting antenna horn 18 and the receiving antenna horn 7 is guaranteed, the CMOS laser displacement sensor A19 and the CMOS laser displacement sensor B20 are convenient for adjusting the height of the small square horizontal plate 23, and the axial center lines of the transmitting antenna horn 18 and the receiving antenna horn 7 both pass through the circle center of the semicircular arc section 4, so that the testing quality and efficiency are guaranteed.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; those of ordinary skill in the art will understand that: the technical solutions described in the above embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A device for testing the electromagnetic wave absorption performance of a building material, comprising a transmitting antenna horn (18) and a receiving antenna horn (7), characterized in that: the combined type steel pipe pile is characterized by further comprising an arched frame, wherein the arched frame is divided into a semi-circular arc section (4) and two vertical sections (3), the two vertical sections (3) are respectively connected with the two lower ends of the semi-circular arc section (4), and the two vertical sections (3) are respectively fixed on the ground (1) through foundation bolts (2); a wave absorbing material (26) is arranged on the ground (1) below the semicircular arc section (4); a nut tube (25) is fixed on the ground (1) corresponding to the vertical central line of the semicircular arc section (4), a screw rod (24) is screwed in the nut tube (25), a small square horizontal plate (23) is fixed at the top of the screw rod (24), the vertical central line of the small square horizontal plate (23) is superposed with the vertical central line of the semicircular arc section (4), an aluminum square standard plate (22) is placed above the small square horizontal plate (23), and a wave-absorbing material sample (21) with the same size as the aluminum square standard plate (22) is placed above the aluminum square standard plate (22); the semi-circular arc section (4) is a semicircular open slot with an upward opening, the cross section of the semi-circular arc section (4) is in a rectangular groove (33), two side edges of the top of the semi-circular arc section (4) are respectively provided with an outer circular arc rack (5), two side edges of the lower end of the semi-circular arc section (4) are respectively provided with an inner circular arc rack (6), two parallel sliding grooves (34) are distributed at the inner bottom of the semi-circular arc section (4) along the direction of the semi-circular arc section (4), one sliding groove (34) is internally provided with a left circular arc sliding rack (36), the other sliding groove (34) is internally provided with a right circular arc sliding rack (35), the lengths of the left circular arc sliding rack (36) and the right circular arc sliding rack (35) are respectively half of the arc length of the semi-circular arc section (4), one end of each of the left circular arc sliding rack (36) and the right circular, the other end is upwards fixed with a positioning baffle (56), the upright rod shaft sleeves (55) and the positioning baffles (56) are respectively positioned at two sides of the transmission device, and the left arc sliding rack (36), the right arc sliding rack (35), the two upright rod shaft sleeves (55) and the two positioning baffles (56) are respectively arranged in mirror symmetry about the vertical center line of the semi-arc section (4); a frame A (12) and a frame B (17) are respectively fixed on the left side and the right side of the semicircular arc section (4), the frame A (12) and the frame B (17) are arranged in mirror symmetry with respect to the vertical center line of the semicircular arc section (4), two parallel upper shafts A (10) are respectively penetrated at the upper parts of the frame A (12) and the frame B (17), two parallel lower shafts A (9) are respectively penetrated at the lower parts of the frame A (12) and the frame B (17), two upper gears A (11) are arranged on each upper shaft A (10), two lower gears A (8) are arranged on each lower shaft A (9), the upper gears A (11) are respectively meshed with the outer circular arc racks (5) on two sides of the semicircular arc section (4), and the vertical rod shaft sleeves (55) on the left circular arc sliding rack (36) and the right circular arc sliding rack (35) are respectively fixed with the corresponding upper shafts A (10); the lower ends of the frame A (12) and the frame B (17) are respectively provided with a receiving antenna horn (7) and a transmitting antenna horn (18), the axial center lines of the receiving antenna horn (7) and the transmitting antenna horn (18) pass through the circle center of the semicircular arc section (4), a CMOS laser displacement sensor A (19) and a CMOS laser displacement sensor B (20) are respectively arranged right in front of or right behind the receiving antenna horn (7) and the transmitting antenna horn (18), laser beams emitted by the CMOS laser displacement sensor A (19) and the CMOS laser displacement sensor B (20) are respectively parallel to the axial center lines of the receiving antenna horn (7) and the transmitting antenna horn (18), and the receiving antenna horn (7) and the transmitting antenna horn (18) as well as the CMOS laser displacement sensor A (19) and the CMOS laser displacement sensor B (20) are respectively in mirror symmetry with the vertical center line of the semi-circular arc section (4); a transmission device is arranged in the middle of the semicircular arc section (4), the transmission device comprises a driving shaft (37) and a driven shaft (16) which penetrate through two sides of the semicircular arc section (4) and are parallel, a driving gear (38) and a left transmission gear (41) are arranged on the driving shaft (37) in the rectangular groove (33) through keys, the left transmission gear (41) is meshed with a left circular arc sliding rack (36), the driving gear (38) is meshed with a driven gear (54), the driven gear (54) is fixed on the driven shaft (16) through keys, a right transmission gear (40) is fixed on the driven shaft (16) through keys, the right transmission gear (40) is meshed with a right circular arc sliding rack (35), a hand wheel (13) is fixed at one end of the driving shaft (37) through a nut, an elastic rubber circular arc pressing block (14) is arranged right above the hand wheel (13), a vertical push rod (51) is connected above the elastic rubber circular arc pressing block (, a vertical push rod (51) upwards penetrates through a hole in a horizontal fixed rod C (50), the other end of the horizontal fixed rod C (50) is fixed on a vertical fixed plate (42), the vertical fixed plate (42) is fixed on the side face of a semicircular arc section (4) through a screw, the top of the vertical push rod (51) is hinged with a movable rod (48) through a short shaft C (49), the other end of the movable rod (48) is hinged with a rotating rod (46) through a short shaft B (47), a spherical wrench (15) is arranged on the rotating rod (46), the other end of the rotating rod (46) is hinged with a horizontal fixed rod A (44) through a short shaft A (45), the other end of the horizontal fixed rod A (44) is fixed on the vertical fixed plate (42), and the spherical wrench (15) upwards or downwards moves to enable an elastic rubber circular arc pressing block (14) to; the hand wheel (13) rotates to drive the driving shaft (37) to rotate, the driving shaft (37) drives the driving gear (38) and the driven gear (54) to synchronously rotate, the driving gear (38) drives the left transmission gear (41) to synchronously rotate, the left transmission gear (41) is meshed with the left arc sliding rack (36) to enable the left arc sliding rack (36) to move, the driven gear (54) drives the driven shaft (16) to synchronously rotate, the driven shaft (16) drives the right transmission gear (40) to synchronously rotate, the right transmission gear (40) is meshed with the right arc sliding rack (35) to enable the right arc sliding rack (35) to move, and the moving directions of the left arc sliding rack (36) and the right arc sliding rack (35) are opposite.
2. The apparatus for testing the electromagnetic wave absorption performance of a construction material according to claim 1, wherein: the bow-shaped frame is made of glass fiber reinforced plastics or engineering plastics, the foundation bolts (2) are made of the engineering plastics, and the nut pipe (25), the screw rod (24) and the small square horizontal plate (23) are made of the engineering plastics.
3. The apparatus for testing the electromagnetic wave absorption performance of a construction material according to claim 1, wherein: the radius of the semicircular arc section (4) is 900 mm.
4. The apparatus for testing the electromagnetic wave absorption performance of a construction material according to claim 1, wherein: the wave-absorbing material (26) is a conical wave-absorbing material.
5. The apparatus for testing the electromagnetic wave absorption performance of a construction material according to claim 1, wherein: the side length of the aluminum square standard plate (22) is 500mm or 300mm or 180 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118392791A (en) * | 2024-06-28 | 2024-07-26 | 中节能(达州)新材料有限公司 | Reflection performance measuring instrument for reflection film material |
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