CN111969294B - 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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- CN111969294B CN111969294B CN202010897120.1A CN202010897120A CN111969294B CN 111969294 B CN111969294 B CN 111969294B CN 202010897120 A CN202010897120 A CN 202010897120A CN 111969294 B CN111969294 B CN 111969294B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 42
- 238000012360 testing method Methods 0.000 title claims abstract description 25
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 15
- 239000004566 building material Substances 0.000 title claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims description 31
- 239000011358 absorbing material Substances 0.000 claims description 21
- 229910052782 aluminium Inorganic materials 0.000 claims description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- 229920006351 engineering plastic Polymers 0.000 claims description 9
- 239000011152 fibreglass Substances 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 230000005670 electromagnetic radiation Effects 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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 electromagnetic wave absorption performance of building materials.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a transmission part device for testing electromagnetic wave absorption performance of building materials.
Background
Electromagnetic radiation is intangible, colorless, tasteless and soundless, but has potential huge harm to human beings, and is an important pollution source which greatly influences the health of residents after wastewater, waste gas, solid waste and noise are polluted. 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 the building material mainly comprises the methods of bow, waveguide, coaxiality and the like, wherein the bow method is suitable for testing the electromagnetic wave absorption performance of the building material in the frequency range of 1 GHz-40 GHz, the waveguide method is suitable for 600 MHz-1 GHz, the coaxiality method is suitable for 30 MHz-600 MHz, the three methods are all used for a vector network analyzer except for the testing frequency range and different hardware structures, the output end and the input end of the vector network analyzer are respectively connected with a transmitting antenna horn and a receiving antenna horn in the bow method testing system, the transmitting antenna horn and the receiving antenna horn are respectively arranged at mirror symmetry positions on two sides of the vertical center line of the bow frame, the horizontal center of an electromagnetic wave absorption performance sample of the building material coincides with the center of the bow frame, part of the electromagnetic wave emitted by the transmitting antenna horn reaches the electromagnetic wave absorption performance sample of the building material and then is reflected to the receiving antenna horn, and the receiving antenna horn obtains a reflection coefficient measured value and a curve of the electromagnetic wave absorption performance sample of the building material, and the measured value and the curve are related to the angle between the transmitting antenna horn and the receiving antenna horn, and the area change of the electromagnetic wave absorption performance sample of the bow frame. At present, the movement adjustment of the transmitting antenna horn and the receiving antenna horn on the bow frame is respectively carried out movement adjustment and fixation, and the mutual mirror symmetry of the transmitting antenna horn and the receiving antenna horn on the bow frame is verified after each adjustment, so that a great deal of time can be wasted, and meanwhile, the mutual mirror symmetry of the transmitting antenna and the receiving antenna on the bow frame is not necessarily ensured, and the testing quality and efficiency are affected.
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 building materials.
The invention is realized by the following technical scheme:
The transmission part device for testing the electromagnetic wave absorption performance of the building material comprises a transmitting antenna horn, a receiving antenna horn and an arch frame, wherein the arch frame is divided into a semicircular arc section and two vertical sections, the two vertical sections are respectively connected with the two lower ends of the semicircular arc section, and the two vertical sections are respectively fixed on the ground through anchor bolts; the ground below the semicircular arc section is provided with a wave absorbing material; a nut pipe is fixed on the ground corresponding to the vertical center line of the semicircular arc section, a screw rod is internally connected with the nut pipe in a rotating way, a small square horizontal plate is fixed at the top of the screw rod, the vertical center line of the small square horizontal plate coincides with the vertical center 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 semicircular arc section is a semicircular open slot with an upward opening, the cross section of the semicircular arc section is a rectangular slot, outer arc racks are arranged at two side edges of the top of the semicircular arc section, inner arc racks are arranged at two side edges of the lower end of the semicircular arc section, two parallel sliding grooves are arranged at the inner bottom of the semicircular arc section along the direction of the semicircular arc section, a left arc sliding rack is arranged in one sliding groove, a right arc sliding rack is arranged in the other sliding groove, the lengths of the left arc sliding rack and the right arc sliding rack are half of the arc length of the semicircular 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 left arc sliding rack and the right arc sliding rack is upwards fixed with a positioning baffle, the vertical rod shaft sleeve and the positioning baffle are respectively positioned at two sides of the transmission device, and the left arc sliding rack, the two vertical rod shaft sleeves and the two positioning baffles are arranged in mirror symmetry about the vertical center line of the semicircular arc section; the left side and the right side of the semicircular arc section are respectively fixed with a frame A and a frame B, the frame A and the frame B are arranged in mirror symmetry about the vertical center line of the semicircular arc section, two parallel upper shafts A are respectively penetrated at the upper parts of the frame A and the frame B, two parallel lower shafts A are respectively penetrated at 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 at the two sides of the semicircular arc section, and upright rod shaft sleeves on the left circular arc sliding racks and the right circular arc sliding racks 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 center of a 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, the laser beam emitted by the CMOS laser displacement sensor A is parallel to the axial center line of the receiving antenna horn, the 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; the driving device comprises a driving shaft and a driven shaft which pass through two sides of a semicircular arc section and are parallel to each other, a driving gear and a left driving gear are arranged on the driving shaft positioned in a rectangular groove through keys, the left driving 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 driving gear is fixed on the driven shaft through keys, the right driving gear is meshed with a right circular arc sliding rack, a hand wheel is fixed at one end of the driving shaft 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 passes through a hole in a horizontal fixing rod C upwards, the other end of the horizontal fixing rod C is fixed on a vertical fixing plate, the vertical fixing plate is fixed on the side face of the semicircular arc section through a screw, the top of the vertical push rod is hinged with a movable rod through a short shaft C, the other end of the movable rod is hinged with a 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, the other end of the horizontal fixing rod A is fixed on a vertical fixing plate, and the spherical wrench upwards or downwards moves to enable the elastic rubber circular arc pressing block to leave the hand wheel; the hand wheel rotates to drive 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 circular arc sliding rack to enable the left circular 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 circular arc sliding rack to enable the right circular arc sliding rack to move, and the moving directions of the left circular arc sliding rack and the right circular arc sliding rack are opposite.
Furthermore, the bow-shaped frame is made of glass fiber reinforced plastic or engineering plastic, the foundation bolts are made of engineering plastic, and the nut tube, the screw rod and the small square horizontal plate are all made of engineering plastic.
Further, the radius of the semicircular arc section is 900mm.
Further, 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 180mm.
The beneficial effects of the invention are as follows: the structure of the invention ensures that the transmitting antenna horn and the receiving antenna horn always maintain mirror symmetry positions in the test process, manual repeated adjustment is not needed, the accuracy of electromagnetic wave absorption performance of the test wave absorbing material sample is ensured, and the test efficiency is greatly improved.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is an enlarged view of section A-A of fig. 1.
Fig. 3 is an enlarged view of section B-B of fig. 1.
Fig. 4 is a top view of fig. 3.
Fig. 5 is a view of the left circular arc sliding rack upper upright post shaft sleeve and the positioning baffle.
Fig. 6 is a top view of the small square horizontal plate of fig. 1.
Fig. 7 is a state diagram of the left circular arc sliding rack sliding rightward.
Fig. 8 is another state diagram of the left circular arc sliding rack sliding rightward.
In the figure, 1 ground, 2 anchor bolts, 3 vertical segments, 4 semicircular segments, 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 hand wheels, 14 elastic rubber circular arc press blocks, 15 ball 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 lead screws, 26 wave absorbing materials, 27 electromagnetic wave transmitting cables, 28 vector network analyzers, 29 electromagnetic wave transmitting cables, 30 center lines a,32 positioning rings, 33 rectangular grooves, 34 sliding grooves, 35 right circular arc sliding racks, 36 left circular arc sliding racks, 37, 38 driving gears, 40 right driving gears, 41 left driving gears, 42 vertical fixed plates, 44 horizontal fixed rods a,45 a,46 rotating rods, 47 short shafts B,48 moving rods, 49 short shafts C,50 horizontal fixed rods C, 54 vertical fixed rods, 54 driving shafts, 55 vertical shafts and 56.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention. In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "inner", "outer", "upper", "lower", "front", "rear", etc. are based on the positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, 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 semicircular arc section 4 and two vertical sections 3, the radius of the semicircular arc section 4 is 900mm, the two vertical sections 3 are respectively connected with the two lower ends of the semicircular arc section 4, can be fixedly connected or integrally connected, and the two vertical sections 3 are respectively fixed on the ground 1 through anchor bolts 2. In order to avoid interference to electromagnetic waves in the testing process, preferably, the bow-shaped frame is made of non-metal insulating material glass fiber reinforced plastic or engineering plastic with small electromagnetic wave reflection, and the anchor bolts 2 are made of engineering plastic.
A wave absorbing material 26, preferably a conical wave absorbing material, is provided on the ground 1 below the above-mentioned semicircular arc section 4. The nut tube 25 is fixed on the ground 1 corresponding to the vertical center line of the semicircular arc section 4, the screw rod 24 is screwed in the nut tube 25, the small square horizontal plate 23 is fixed on the top of the screw rod 24, and the nut tube 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 fiber reinforced plastics in order to avoid interference to electromagnetic waves. The vertical center line of the small square horizontal plate 23 coincides with the vertical center line of the semicircular arc section 4, the center point of the upper surface of the small square horizontal plate 23 coincides with the center of the semicircular arc section 4 during testing, the height of the small square horizontal plate 23 can be adjusted, the screw rod 24 is rotated by rotating the small square horizontal plate 23, and the screw rod 24 rotates in the screw tube 25, so that the vertical height of the small square horizontal plate 23 is adjusted, and the height of the small square horizontal plate 23 is adjusted to be just coincident with the center of the semicircular arc section 4 during testing. 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, and the side length of the aluminum square standard plate 22 is 500mm, 300mm and 180mm, and the thickness is 5mm. Wherein the side length is 500mm and is suitable for 1-8 GHz,300mm and is suitable for 2-18 GHz, and 180mm and is suitable for 6-40 GHz. The aluminum square standard plate 22 is placed on the small lifting 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, the opening is upward, the cross section of the semicircular arc section 4 is a rectangular slot 33, as shown in fig. 2, the two side edges of the top of the semicircular arc section 4 are respectively provided with an outer arc rack 5, and the two outer arc racks 5 are arranged along the two side edges of the top of the semicircular arc section 4 and are in shape fit with the two side edges of the top. The two side edges of the lower end of the semicircular arc 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 in shape fit with the two side edges of the lower end. The outer arc rack 5 and the inner arc rack 6 are fixed racks and cannot slide, can be integrally manufactured with the semicircular arc section 4, and can be fixed on the upper side edge and the lower side edge of the semicircular arc section 4 in a later period. Two parallel semicircular sliding grooves 34 are distributed on the inner bottom of the semicircular arc section 4, namely the inner bottom of the rectangular groove 33 along the direction of the semicircular arc section 4, and the length of each sliding groove 34 is equal to or similar to the arc length of the semicircular arc section 4. One of the sliding grooves 34 is internally provided with a left arc sliding rack 36, the other sliding groove 34 is internally provided with a right arc sliding rack 35, the left arc sliding rack 36 and the right arc sliding rack 35 are racks which can slide in the sliding groove 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. An upright rod shaft sleeve 55 is fixed upwards at one end of the left circular arc sliding rack 36, the upright rod shaft sleeve 55 is formed by fixing an upright rod on the left circular arc sliding rack 36, then a shaft sleeve is fixed at the top end of the upright rod to form the upright rod shaft sleeve 55, and a positioning baffle 56 is fixed upwards at the other end of the left circular arc sliding rack 36. The vertical rod shaft sleeve 55 on the left circular arc sliding rack 36 is positioned at the left side of the transmission device in the middle of the semicircular arc section 4, the transmission device will be described in detail below, and the positioning baffle 56 on the left circular arc sliding rack 36 is positioned at the right side of the transmission device. Similarly, an upright 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 upright 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 respectively fixed on the left side and the right side of the semicircular arc section 4, and the frame a12 and the frame B17 are mirror symmetrical about the vertical center line of the semicircular arc section 4, and since both side structures are mirror symmetrical about the vertical center line of the semicircular arc section 4, only the left structure will be described below. Referring to fig. 1, a frame a12 is fixed on the periphery of the semicircular arc section 4, two parallel upper shafts a10 are penetrated at the upper part of the frame a12, two parallel lower shafts A9 are penetrated at the lower part of the frame a12, and the upper shafts a10 and the lower shafts A9 are fixed with the frame a12 into a whole. Two upper gears A11 are arranged on each upper shaft A10 through an elastic collar for the shaft, two lower gears A8 are arranged on each lower shaft A9 through an elastic collar for the shaft, thus, four upper gears A11 are respectively meshed with the outer circular arc racks 5 on two sides, four lower gears A8 are respectively meshed with the inner circular 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. The frame a12 can thus be moved along the semicircular arc section 4 by a gear-rack engagement. The vertical rod shaft sleeve 55 on the left circular 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 circular arc sliding rack 36 are connected into a whole through the vertical rod shaft sleeve 55, so that when the left circular arc sliding rack 36 slides in the sliding groove 34, the frame A12 is driven to move along the semicircular arc section 4. The vertical rod shaft sleeve 55 and the positioning baffle 56 are blocked by the transmission device when moving to the limit positions, so that the left arc sliding rack 36 cannot be separated from the transmission device no matter in which direction to move, and the vertical rod shaft sleeve 55 and the positioning baffle 56 have a limiting effect.
The middle part of the lower end of the frame a12 is provided with a receiving antenna horn 7, the front or the back of the receiving antenna horn 7 is provided with a CMOS laser displacement sensor a19, namely the CMOS laser displacement sensor a19 is arranged in the inward or outward direction of the vertical drawing 1, the axial center line of the receiving antenna horn 7 passes through the center of the semicircular arc section 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 positioned at the center of the semicircular arc section 4, at this time, the line between the laser beam emitted by the CMOS laser displacement sensor a19 and the front center point of the upper surface of the small square horizontal plate 23 intersects with the rear center point, which is referred to as a center line a30, and the front and rear directions are defined as the rear directions of the vertical drawing 1, and the outward directions are defined as the front directions, refer to fig. 6.
The right circular arc sliding rack 35 and the left circular arc sliding rack 36 are arranged in a mirror image structure, and the frame B17 and the frame a12 are arranged in the same mirror image structure, except 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 arranged symmetrically in a mirror image structure. 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, the laser beam emitted by the CMOS laser displacement sensor B20 also 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, whereby the height of the small square horizontal plate 23 can be adjusted according to this, so that the center of the upper surface thereof 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 positioned in a far field region relative to the measured wave-absorbing material sample 21, and meanwhile, the angle positions of the transmitting antenna horn 18 and the receiving antenna horn 7 are symmetrical, so that the electromagnetic wave incident angle and the reflection angle are symmetrical relative to the vertical center line of the small square horizontal plate 23.
The transmission device is arranged at the center of the semicircular arc section 4, i.e. at the position of the vertical center line of the semicircular arc section 4, i.e. the transmission device is arranged at the middle part of the semicircular arc section 4, 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 collars for shafts, and one end of the driving shaft 37 is provided with a shaft shoulder for positioning. The driving shaft 37 in the rectangular groove 33 is provided with a driving gear 38 and a left driving gear 41 by keys, the left driving gear 41 is meshed with the left circular 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 by keys, the driven shaft 16 is parallel to the driving shaft 37, the driven shaft 16 is provided with a right driving gear 40 by keys, the right driving gear 40 is meshed with the right circular arc sliding rack 35, one end of the driven shaft 16 is provided with a shaft shoulder for positioning, and the other end of the driven shaft 16 is fixed by a shaft elastic retainer ring. 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 passes through a hole on 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, and dead points are formed when the short shafts A45, B47 and C49 are arranged on the same vertical plane. 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, at the moment, the hand wheel 13 can be rotated by the other hand, after the rotation is finished, the ball wrench 15 moves downwards, and the elastic rubber arc pressing block 14 presses the hand wheel 13 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 driven gear 54 is engaged with the driving gear 38 on the driving shaft 37, 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 opposite direction 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 opposite direction to the frame a12, and the transmitting antenna horn 18 fixed under the frame B17 also moves synchronously. The diameters and 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 circular arc sliding rack 36 and the right circular arc sliding rack 35 are the same as the moduli of the left transmission gear 41 and the right transmission gear 40, respectively, so that when the hand wheel 13 rotates, the transmitting antenna horn 18 and the receiving antenna horn 7 always move in opposite directions, and mirror symmetry positions are always maintained, which ensures the accuracy and efficiency of electromagnetic wave absorption performance of the test wave absorbing material sample 21.
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 screw 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 located on the center line A30, at the moment, represents that the center point of the upper surface of the small square horizontal plate 23 is located at the center of the semicircle segment 4, then holds the spherical spanner 15 with one hand to move upwards so that the elastic rubber circular arc pressing block 14 does not press the hand wheel 13 any more, rotates the hand wheel 13 so that the frame A12 and the frame B17 moves downwards, and enables the elastic rubber circular arc pressing block 14 to press the hand wheel 13 again. At this time, the vector network analyzer 28 is turned on to set the test 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 is within +/-0.5 dB, then the wave absorbing material sample 21 is placed on the aluminum square standard plate 22 and aligned with the edges of the aluminum square standard plate, the transmitting antenna horn 18 emits electromagnetic waves with set frequency, the receiving antenna horn 7 receives the electromagnetic waves reflected by the wave absorbing material sample 21, and the vector network analyzer 28 analyzes the values and curves of the wave absorbing performance of the wave absorbing material sample 21 along with the frequency change, and the test result is obtained after the curves are stable.
According to the invention, the transmitting antenna horn 18 and the receiving antenna horn 7 are driven by gears and racks, so that mirror symmetry of the transmitting antenna horn 18 and the receiving antenna horn 7 is ensured, the CMOS laser displacement sensor A19 and the CMOS laser displacement sensor B20 are convenient to adjust 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 pass through the center of the semicircular arc section 4, so that the testing quality and efficiency are ensured.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; those of ordinary skill in the art will appreciate that: the technical scheme described in the above embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A transmission part device for testing electromagnetic wave absorption performance of building materials, comprising a transmitting antenna horn (18) and a receiving antenna horn (7), characterized in that: the device also comprises an arch frame, wherein the arch frame is divided into a semicircular arc section (4) and two vertical sections (3), the two vertical sections (3) are respectively connected with the two lower ends of the semicircular arc section (4), and the two vertical sections (3) are respectively fixed on the ground (1) through foundation bolts (2); the ground (1) below the semicircular arc section (4) is provided with a wave absorbing material (26); a screw pipe (25) is fixed on the ground (1) corresponding to the vertical center line of the semicircular arc section (4), a screw rod (24) is screwed in the screw pipe (25), a small square horizontal plate (23) is fixed at the top of the screw rod (24), the vertical center line of the small square horizontal plate (23) coincides with the vertical center 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 semicircular arc section (4) is a semicircular opening groove with an upward opening, the cross section of the semicircular arc section (4) is a rectangular groove (33), outer arc racks (5) are arranged at two side edges of the top of the semicircular arc section (4), inner arc racks (6) are arranged at two side edges of the lower end of the semicircular arc section (4), two parallel sliding grooves (34) are distributed at the inner bottom of the semicircular arc section (4) along the direction of the semicircular arc section (4), a left arc sliding rack (36) is arranged in one sliding groove (34), a right arc sliding rack (35) is arranged in the other sliding groove (34), the lengths of the left arc sliding rack (36) and the right arc sliding rack (35) are half of the arc length of the semicircular arc section (4), one end of each of the left arc sliding rack (36) and the right arc sliding rack (35) is fixed with a vertical rod sleeve (55), the other end of each vertical rod sleeve (56) is fixed with a positioning baffle (56) upward, and each vertical rod sleeve (55) is respectively positioned at two sides of the transmission device, and the left arc sliding rack (36) and the right arc sliding rack (35) and the two vertical rod sleeves (55) are arranged in a mirror image mode; the left side and the right side of the semicircular arc section (4) are respectively fixed with a frame A (12) and a frame B (17), the frame A (12) and the frame B (17) are arranged in mirror symmetry about 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 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 outer circular arc racks (5) at two sides of the semicircular arc section (4), and upright rod shaft sleeves (55) on a left circular arc sliding rack (36) and a 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 center of the semicircular arc section (4), the right front or right rear of the receiving antenna horn (7) and the transmitting antenna horn (18) are respectively provided with a CMOS laser displacement sensor A (19) and a CMOS laser displacement sensor B (20), and laser beams emitted by the CMOS laser displacement sensor A (19) and the CMOS laser displacement sensor B (20) are respectively in mirror symmetry with the vertical center lines of the semicircular arc section (4) respectively; the middle position of the semicircular arc section (4) is provided with a transmission device, 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, the driving shaft (37) positioned in the rectangular groove (33) is provided with a driving gear (38) and a left transmission gear (41) 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 the driven shaft (16) through keys, the driven shaft (16) is fixedly provided with a right transmission gear (40) through keys, the right transmission gear (40) is meshed with a right arc sliding rack (35), one end of the driving shaft (37) is fixedly provided with a hand wheel (13) through a nut, an elastic rubber arc pressing block (14) is arranged right above the hand wheel (13), a vertical pushing rod (51) is connected above the elastic rubber arc pressing block (14), the other end of the vertical pushing rod (51) is fixedly arranged on a vertical fixing plate (42) through a hole on a horizontal fixing rod C (50), the other end of the horizontal fixing rod C (50) is fixedly arranged on the vertical fixing plate (42) and fixedly arranged on the top of the semicircular arc section (48) through a vertical bolt (48), the other end of the moving rod (48) is hinged with the 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 fixing rod A (44) through a short shaft A (45), the other end of the horizontal fixing rod A (44) is fixed on a vertical fixing plate (42), and the spherical wrench (15) moves upwards or downwards to enable an elastic rubber circular arc pressing block (14) to leave or press a hand wheel (13); 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 circular arc sliding rack (36) to enable the left circular 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 circular arc sliding rack (35) to enable the right circular arc sliding rack (35) to move, and the moving directions of the left circular arc sliding rack (36) and the right circular arc sliding rack (35) are opposite; the arch frame is made of glass fiber reinforced plastic or engineering plastic, the foundation bolt (2) is made of engineering plastic, and the nut tube (25), the screw rod (24) and the small square horizontal plate (23) are all made of engineering plastic; the radius of the semicircular arc section (4) is 900mm.
2. The transmission part device for testing electromagnetic wave absorbing performance of building materials according to claim 1, wherein: the wave-absorbing material (26) is a conical wave-absorbing material.
3. The transmission part device for testing electromagnetic wave absorbing performance of building materials according to claim 1, wherein: the side length of the aluminum square standard plate (22) is 500mm or 300mm or 180mm.
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