Multi-directional electromagnetic radiation shielding effectiveness testing device and testing method for three-dimensional finished fabrics

Abstract

The present invention relates to the field of fabric detection devices, and specifically to a multi-directional electromagnetic radiation shielding effectiveness detection device and a detection method for three-dimensional finished fabrics, which are characterized by comprising a signal transmitting device, a signal receiving device, a clothing suspension device, a hemispherical moving device, a shielding chamber and an opening adjustment device, wherein the clothing suspension device comprises a blower, an air outlet pipe and a clothing fixing frame, wherein the blower is connected to the air outlet pipe through a pipeline, and the clothing fixing frame is set above the air outlet pipe. The detection device provided by the present invention connects the bottom of the finished clothing to be tested with a clamp, and uses a blower to blow air into the finished clothing, so that the finished clothing is suspended in the air, and the measured data is closer to the actual anti-electromagnetic radiation shielding effectiveness of the finished fabric in the actual wearing scene, and the measured data has more reference value; the hemispherical moving device can simulate the electromagnetic radiation shielding effect of the radiation source at different positions of the finished fabric.

Description

Technical Field

[0001] The invention relates to the field of fabric detection devices, and in particular to multi-directional electromagnetic radiation shielding effectiveness detection equipment and a detection method for three-dimensional finished fabrics. Background Art

[0002] With the rapid development of modern science and technology, an invisible and intangible pollution source has attracted increasing attention from all walks of life. This is electromagnetic radiation, which is called the "invisible killer". Today, more and more electronic and electrical equipment are put into use, making electromagnetic waves of various frequencies and different energies fill every corner of the earth and even the wider universe. For the human body, a good conductor, electromagnetic waves will inevitably cause a certain degree of harm. In order to reduce the harm of electromagnetic wave radiation to the human body, modern fabrics achieve the effect of shielding electromagnetic radiation by adding metal fibers to the fabric or coating the surface of the fabric with metal coatings. In order to measure the anti-electromagnetic radiation performance of the fabric, it is necessary to test the anti-electromagnetic radiation of the fabric. The existing test of the shielding effectiveness of fabrics generally adopts the test method of the electromagnetic radiation shielding effectiveness of planar materials, and the commonly used ones are: ASTM-ES7 test method, shielding room method, waveguide test method, microwave dark box test method, microwave dark chamber test method, etc. For example, the invention patent with the authorization publication number CN101526486A discloses an anti-electromagnetic radiation fabric simulation tester, which is used to solve the simulation and testing problems of textile materials. The technical scheme is as follows: the structure includes a vector network analyzer and a flange coaxial device, the flange coaxial device is connected to the insertion loss or return loss test loop of the vector network analyzer, a sample holder is arranged in the middle of the flange coaxial device, and winding notches with uniform intervals are arranged on the outer edge of the sample holder, wherein the spacing of the winding notches on the opposite sides is set the same, a circular hole coaxial with the cavity in the flange coaxial device is arranged in the center of the sample holder, and the electromagnetic wire constituting the fabric to be tested is wound on the winding notch. Although the invention can simulate and test fabrics with different density electromagnetic wires, and thus provide reliable and accurate data basis for designing anti-electromagnetic radiation textiles that meet the requirements, the shielding effectiveness of fabrics with anti-electromagnetic radiation performance after being made into different styles of clothing is very different, and the shielding effectiveness of clothing is related to the shielding effectiveness of its fabric, the exposed area of ​​clothing, etc. The testing principle of the above method is to measure the field strength value when there is shielding fabric or not, and then calculate the shielding effectiveness of the fabric by the following formula: SE=20lg(E1 / E2). However, the shielding performance of flat materials and finished three-dimensional fabrics is not equivalent. There are many openings on the finished three-dimensional fabric, such as the collar, cuffs, waist, etc. Electromagnetic waves can easily enter from the openings below, which greatly reduces the shielding performance of the finished three-dimensional fabric. In order to make the measurement results more in line with the actual use scenario, some studies have also placed fabric covers on wooden boxes for shielding performance testing, simulating clothing openings by opening the wooden box. However, since the shape of the clothing is very different from that of the wooden box, the values ​​tested by this test method still have errors with the actual anti-electromagnetic radiation performance. In view of this, this case was created. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a multi-directional electromagnetic radiation shielding effectiveness detection device and a detection method for three-dimensional finished fabrics, so as to solve the problems raised in the background technology.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a multi-directional electromagnetic radiation shielding effectiveness detection device for three-dimensional finished fabrics, characterized in that it includes:

[0005] A signal transmitting device, the signal transmitting device comprising a signal source and an active transmitting antenna, the active transmitting antenna being connected to the signal source circuit;

[0006] A signal receiving device, the signal receiving device comprising a signal receiver, an active receiving antenna and a coaxial cable, the active receiving antenna being connected to the signal receiver via the coaxial cable;

[0007] A clothing suspension device, the clothing suspension device comprising a blower, an air outlet pipe and a clothing fixing rack, the blower is connected to the air outlet pipe through a pipeline, and the clothing fixing rack is mounted above the air outlet pipe;

[0008] and a hemispherical moving device, the hemispherical moving device includes a semi-ring frame, a supporting base, a semi-ring driving unit and a sliding vehicle, the semi-ring frame is pivotally mounted on the supporting base, the semi-ring driving unit drives the semi-ring frame to rotate, the semi-circular ring slide rail is arranged on the semi-circular ring slide rail, the sliding vehicle is slidably arranged on the semi-circular ring slide rail, and the signal transmitting device is fixed on the sliding vehicle.

[0009] Preferably, it also includes a shielding room, the signal transmitting device, the signal receiving device hemispherical moving device, the air outlet pipe and the clothing fixing rack are arranged in the shielding room, the blower is arranged outside the shielding room, and an air outlet is arranged on the top of the shielding room.

[0010] Preferably, the signal receiving device also includes a fixed sleeve, a movable rod and a positioning bolt, the bottom of the fixed sleeve is fixed to the center of the clothing fixing rack, the movable rod can be longitudinally slidably sleeved in the fixed sleeve, and is locked and connected to the fixed sleeve by the positioning bolt, the active receiving antenna is fixed to the top of the movable rod, and the coaxial cable passes through the fixed sleeve and the movable rod to be connected to the active receiving antenna circuit.

[0011] Preferably, the clothing fixing rack is provided with an annular groove with a T-shaped cross-section, and a plurality of clamps are provided in the annular groove, and the clamps include an adjusting bolt, an adjusting nut, a rope and a clip, the bolt head of the adjusting bolt is slidably arranged in the annular groove, the adjusting bolt is fixed to the clothing fixing rack by a threaded locking connection with the adjusting nut, the upper and lower ends of the rope are respectively connected to the adjusting bolt and the clip, and the clothing fixing rack and the clamps are made of insulating materials.

[0012] Preferably, it also includes an opening adjustment device, which is fixedly arranged at the opening at the top of the air outlet pipe and is used to control the size of the opening at the top of the air outlet pipe, the opening adjustment device includes an opening adjustment ring, an opening and closing blade, an opening adjustment rod, an opening adjustment rack, an opening adjustment gear, an opening adjustment worm, an opening adjustment base and an opening adjustment handle, the opening adjustment base is fixedly arranged on the side wall of the air outlet pipe, the opening adjustment ring is coaxially rotatably sleeved on the air outlet pipe, the opening and closing blades and the opening adjustment rod are the same in number, and each opening and closing blade closes the opening at the top of the air outlet pipe when closed, one end of the opening and closing blade is provided with an opening and closing rotating shaft, and the other end is provided with a driving rod, the opening adjustment rod is provided with an opening driving strip groove, and the driving rod end of the opening and closing blade is slidably matched with the opening driving strip groove, the opening adjustment rack is fixedly arranged on the opening adjustment ring, the opening adjustment gear and the opening adjustment worm are pivotally arranged on the opening adjustment base, the two sides of the opening adjustment gear are respectively meshed with the opening adjustment rack and the opening adjustment worm, and the opening adjustment handle is fixedly arranged on the opening adjustment worm.

[0013] Preferably, the number of the opening and closing blades is 5, and the connecting surface between adjacent opening and closing blades is a curved surface.

[0014] Preferably, the semi-ring driving unit comprises a semi-ring servo motor, and the semi-ring servo motor drives the semi-ring frame to rotate along a horizontal axis.

[0015] Preferably, the sliding vehicle includes a frame, rollers, sliding gears, a sliding servo motor and a semi-annular rack fixed on a semi-ring frame, two of the rollers are pivotally provided on the frame, the rollers are slidingly provided in a semi-circular slide rail, the sliding gear is pivotally provided on the frame, the sliding gear is meshed with the semi-circular rack, the sliding servo motor drives the sliding gear to rotate, the semi-ring frame is a semi-circular ring, a sliding conductive track is provided in the semi-circular slide rail, and the signal source is slidingly and conductively connected to the sliding conductive track.

[0016] A multi-directional electromagnetic radiation shielding effectiveness detection method for three-dimensional fabrics, using the above-mentioned detection equipment for detection, is characterized in that it includes the following steps:

[0017] Step 1: Adjust the clamp to a suitable position on the finished fabric fixing frame and lock the clamp, wrap the clothing to be tested around the active receiving antenna from the top to the bottom, and clamp the bottom of the finished fabric with a clip;

[0018] Step 2: The blower blows air into the air outlet pipe, and the opening adjustment device is adjusted to make the air outlet pipe open to a suitable opening size. The blower guides the air into the finished fabric, so that the finished fabric is suspended in the air;

[0019] Step 3: The active transmitting antenna generates an electromagnetic radiation signal, and the active receiving antenna set in the finished fabric receives the electromagnetic radiation signal and transmits the signal to a signal receiver to measure the electromagnetic radiation shielding effect;

[0020] Step 4: The active transmitting antenna can be controlled to move within a hemispherical periphery centered on the finished fabric through a hemispherical moving device to simulate the electromagnetic radiation shielding effect when the radiation source is at different orientations of the finished fabric.

[0021] Preferably, when the finished fabric is a top, the fabrics on the front and back of the top are connected by yarns of the same material as the finished fabric to prevent the top from becoming round under the action of air blowing; when the finished fabric is trousers, the waist opening of the trousers is clamped on a clamp, and the wind from the blower is blown in from the waist opening of the trousers.

[0022] From the above description, it can be seen that the multi-directional electromagnetic radiation shielding effectiveness detection equipment and detection method for three-dimensional finished fabrics provided by the present invention have the following beneficial effects: the bottom of the finished clothing to be tested is connected to the clamp, and a blower is used to blow air into the finished clothing so that the finished clothing is suspended in the air, and an active receiving antenna arranged inside the suspended finished clothing receives the electromagnetic radiation signal and transmits the signal to the signal receiver to calculate the electromagnetic radiation shielding effect. Compared with the planar fabric measurement method, the data measured by the measuring device and the measuring method provided by the present invention are closer to the actual electromagnetic radiation shielding effectiveness of the finished fabric in the actual wearing scene, and the measured data has more reference value; the active transmitting antenna can be controlled to move on the hemispherical periphery centered on the finished fabric through the hemispherical moving device, which can simulate the electromagnetic radiation shielding effect of the radiation source at different positions of the finished fabric, and provide a reference for improving the radiation resistance of the finished fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the multi-directional electromagnetic radiation shielding effectiveness detection device for three-dimensional finished fabrics of the present invention.

[0024] Figure 2 for Figure 1 A magnified schematic diagram of local A.

[0025] Figure 3 for Figure 1 A magnified schematic diagram of local B.

[0026] Figure 4 It is a schematic diagram of the closed state of the opening adjustment device.

[0027] Figure 5 It is a schematic diagram of the opening state of the opening adjustment device.

[0028] Figure 6This is a schematic diagram of the usage status of the multi-directional electromagnetic radiation shielding effectiveness testing equipment for three-dimensional finished fabrics. DETAILED DESCRIPTION

[0029] The present invention is further described below through specific implementation modes.

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0031] like Figure 1 As shown, the multi-directional electromagnetic radiation shielding effectiveness detection equipment for three-dimensional finished fabrics of the present invention is characterized by comprising: a signal transmitting device 1, a signal receiving device 2, a clothing suspension device, a hemispherical moving device 4, a shielding room 5 and an opening adjustment device 6.

[0032] like Figure 3 As shown, the signal transmitting device 1: the signal transmitting device 1 includes a signal source 11 and an active transmitting antenna 12, the active transmitting antenna 12 is circuit-connected to the signal source 11, the signal source 11 can use a digital synthetic high-frequency signal generator: the frequency resolution is 0.1Hz; the frequency range is 5k~40M; the characteristic impedance is 60W; the output level error is <0.1dB, and the active transmitting antenna 12 uses a ring-shaped active transmitting antenna 12 with a diameter of 30-40cm.

[0033] like Figure 2 As shown, the signal receiving device 2: the signal receiving device 2 includes a signal receiver 21, an active receiving antenna 22 and a coaxial cable 23. The active receiving antenna 22 is connected to the signal receiver 21 through the coaxial cable 23. The signal receiver 21 is a fully automatic interference field strength test receiver: the frequency resolution is 15Hz; the frequency range is 5k~40M; the characteristic impedance is 60W; the field strength measurement error is <1dB, the active receiving antenna 22 adopts a ring-shaped active receiving antenna with a diameter of 20-30cm, and the coaxial cable 23: the characteristic impedance is 50W. For the specific models and specific circuit connection methods of the electronic equipment related to the signal transmitting device 1 and the signal receiving device 2, please refer to the prior art.

[0034] The signal receiving device 2 also includes a fixed sleeve 24, a movable rod 25 and a positioning bolt 26. The bottom of the fixed sleeve 24 is fixedly arranged at the center of the clothing fixing frame 33. The movable rod 25 can be longitudinally slidably sleeved in the fixed sleeve 24 and is locked and connected with the fixed sleeve 24 through the positioning bolt 26. The active receiving antenna 22 is fixedly arranged at the top of the movable rod 25. The coaxial cable 23 passes through the fixed sleeve 24 and the movable rod 25 and is connected to the active receiving antenna 22 circuit. The relative position of the movable rod 25 and the fixed sleeve 24 can be adjusted, thereby adjusting the height of the active receiving antenna 22 on the clothing fixing frame 33 to adapt to clothes of different heights.

[0035] like Figure 1 and 2 As shown, the clothing suspension device: The clothing suspension device includes a blower 31, an air outlet pipe 32 and a clothing fixing rack 33, the blower 31 is connected to the air outlet pipe 32 through a pipeline, and the clothing fixing rack 33 is erected above the air outlet pipe 32;

[0036] An annular groove 34 with a T-shaped cross-section is provided on the clothing fixing rack 33, and a plurality of clamps are provided in the annular groove 34, which include an adjusting bolt 35, an adjusting nut 36, a rope 37 and a clamp 38. The bolt head of the adjusting bolt 35 is slidably set in the annular groove 34, and the adjusting bolt 35 is fixed to the clothing fixing rack 33 by a threaded locking connection with the adjusting nut 36. The upper and lower ends of the rope 37 are respectively connected to the adjusting bolt 35 and the clamp 38. The clothing fixing rack 33 and the clamp are made of insulating materials; loosen the adjusting nut 36, and the adjusting bolt 35 can be adjusted to the position in the T-shaped annular groove 34. Lock the adjusting nut 36 to fix the position of the adjusting bolt 35 in the annular groove 34. By adjusting the position of the clamp, clothes of different calibers can be used.

[0037] like Figure 1 As shown, the hemispherical moving device 4: the hemispherical moving device 4 includes a semi-ring frame 41, a supporting base 42, a semi-ring driving unit 43 and a sliding vehicle, the semi-ring frame 41 is pivotally mounted on the supporting base 42, the semi-ring driving unit 43 drives the semi-ring frame 41 to rotate, a semicircular ring slide rail is arranged on the semi-circular ring slide rail, the sliding vehicle is slidably arranged on the semi-circular ring slide rail, and the signal transmitting device 1 is fixedly mounted on the sliding vehicle.

[0038] The semi-ring driving unit 43 includes a semi-ring servo motor, which drives the semi-ring frame 41 to rotate along the horizontal axis. The servo motor has the characteristics of precise positioning and self-locking, and can achieve precise adjustment of the angle.

[0039] like Figure 3 As shown, the sliding vehicle includes a frame 44, a roller 45, a sliding gear 46, a sliding servo motor 47 and a semi-annular rack 48 fixed on the semi-annular frame 41. Two rollers 45 are pivoted on the frame 44, and the rollers 45 are slidably arranged in the semi-circular ring slide rail. The sliding gear 46 is pivoted on the frame 44, and the sliding gear 46 is meshed with the semi-annular rack 48. The sliding servo motor 47 drives the sliding gear 46 to rotate. The semi-annular frame 41 is a semi-circular ring, and a sliding conductive track is arranged in the semi-circular ring slide rail. The signal source 11 is slidably connected to the sliding conductive track. By moving the sliding vehicle on the semi-annular frame 41 and rotating the semi-annular frame 41 by 180 degrees along its own rotation axis, the active transmitting antenna 12 can be moved in the hemispherical space above the clothing fixing frame 33 to perform multi-angle measurement.

[0040] like Figure 1As shown in the figure, the shielding room 5 is indicated by a dotted line: the signal transmitting device 1, the signal receiving device 2, the hemispherical moving device 4, the air outlet duct 32 and the clothing fixing rack 33 are arranged in the shielding room 5, the blower 31 is arranged outside the shielding room 5, the top of the shielding room 5 is provided with an air outlet 51, and the shielding room 5 adopts a double-layer copper mesh and a steel mesh to shield the shielding room 5.

[0041] like Figure 4 and Figure 5 As shown, the opening adjustment device 6: the opening adjustment device 6 is fixed to the opening at the top of the air outlet pipe 32 and is used to control the size of the opening at the top of the air outlet pipe 32. The opening adjustment device 6 includes an opening adjustment ring 61, an opening and closing blade 62, an opening adjustment rod 63, an opening adjustment rack 64, an opening adjustment gear 65, an opening adjustment worm 66, an opening adjustment base 67 and an opening adjustment handle 68. The opening adjustment base 67 is fixed to the side wall of the air outlet pipe 32, the opening adjustment ring 61 is coaxially rotatably sleeved on the air outlet pipe 32, the opening and closing blades 62 and the opening adjustment rod 63 are the same in number, and each opening and closing blade 62 is closed. The top opening of the air outlet 32 ​​is closed, one end of the opening and closing blade 62 is provided with an opening and closing rotating shaft 621, and the other end is provided with a driving rod 622, an opening adjustment rod 63 is provided with an opening driving strip groove 69, and the end of the driving rod 622 of the opening and closing blade 62 is slidably matched with the opening driving strip groove 69, the opening adjustment rack 64 is fixed on the opening adjustment ring 61, the opening adjustment gear 65 and the opening adjustment worm 66 are pivotally mounted on the opening adjustment base 67, the two sides of the opening adjustment gear 65 are respectively meshed with the opening adjustment rack 64 and the opening adjustment worm 66, and the opening adjustment handle 68 is fixed on the opening adjustment worm 66.

[0042] The opening adjustment method is as follows: the opening adjustment handle 68 is turned to drive the opening adjustment worm 66 to rotate, and the adjustment ring is driven to rotate through the transmission of the opening adjustment gear 65 and the opening adjustment rack 64, and the opening and closing blades 62 are driven to rotate through the sliding connection between the opening drive strip groove 69 and the end of the driving rod 622 of the opening and closing blade 62, thereby adjusting the opening of the opening and closing blade 62 to adapt to the finished fabrics of different opening sizes, ensuring that most of the wind can enter the finished fabrics and blow the finished fabrics up, such as Figure 4 The opening and closing blade 62 is shown in the closed state. Figure 5 The opening and closing blades 62 are shown in the open state.

[0043] Preferably, the number of the opening and closing blades 62 is 5, and the connecting surface between adjacent opening and closing blades 62 is an arc surface, so that when each opening and closing blade 62 is closed, the opening of the blast pipe is completely closed.

[0044] A multi-directional electromagnetic radiation shielding effectiveness detection method for three-dimensional fabrics, using the above-mentioned detection equipment for detection, is characterized in that it includes the following steps:

[0045] Step 1: Adjust the clamp to a suitable position on the finished fabric fixing frame and lock the clamp, wrap the clothing to be tested from the top to the bottom of the active receiving antenna 22, and clamp the bottom of the finished fabric with a clip 38;

[0046] Step 2: The blower 31 blows air into the air outlet pipe 32, and the opening adjustment device 6 is adjusted to open the air outlet pipe 32 to a suitable opening size. The blower 31 guides the air into the finished fabric, so that the finished fabric is suspended in the air;

[0047] Step 3: The active transmitting antenna 12 generates an electromagnetic radiation signal, and the active receiving antenna 22 set in the finished fabric receives the electromagnetic radiation signal and transmits the signal to the signal receiver 21 to measure the electromagnetic radiation shielding effect; at the same time, the field strength value of the signal receiver when there is no shielding body is measured. Since the field strength of the fully automatic interference field strength test receiver is directly expressed in dB (mV / m), the difference between the two field strength values ​​is the shielding effect SE of the fabric;

[0048] Step 4: The active transmitting antenna 12 can be controlled to move within a hemispherical periphery centered on the finished fabric by means of the hemispherical moving device 4, so as to simulate the electromagnetic radiation shielding effect when the radiation source is at different positions of the finished fabric.

[0049] like Figure 6 As shown, when the finished fabric is a top, the fabrics of the front and back of the top are connected by a yarn 100 of the same material as the finished fabric (the end of the yarn 100 is threaded and knotted and fixedly connected to the finished fabric) to simulate the normal wearing shape and prevent the top from becoming round under the action of the wind; when the finished fabric is trousers, the waist opening of the trousers is clamped on the clamp, and the wind from the blower 31 is blown in from the waist opening of the trousers.

[0050] The multi-directional electromagnetic radiation shielding effectiveness detection device and detection method for three-dimensional finished fabrics provided by the present invention have the following beneficial effects: the bottom of the finished clothing to be tested is connected to the clamp, and air is blown into the finished clothing by a blower so that the finished clothing is suspended in the air, and an active receiving antenna arranged inside the suspended finished clothing receives electromagnetic radiation signals and transmits the signals to a signal receiver, and the electromagnetic radiation shielding effect is calculated. Compared with the planar fabric measurement method, the data measured by the measurement device and measurement method provided by the present invention are closer to the actual electromagnetic radiation shielding effectiveness of the finished fabric in the actual wearing scene, and the measurement data has more reference value; the active transmitting antenna can be controlled to move on the hemispherical periphery centered on the finished fabric through the hemispherical moving device, which can simulate the electromagnetic radiation shielding effect of the radiation source at different positions of the finished fabric, and provide a reference for improving the radiation resistance of the finished fabric.

[0051] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. Matters not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or connected or set in one piece; the models of electrical appliances provided in the present invention are for reference only. For ordinary technicians in this field, different models of electrical appliances with the same functions can be replaced according to actual usage conditions. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The above are only some specific implementation methods of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A multi-directional electromagnetic radiation shielding effectiveness testing device for three-dimensional finished fabrics, characterized in that: include: A signal transmitting device, the signal transmitting device comprising a signal source and an active transmitting antenna, the active transmitting antenna being connected to the signal source circuit; A signal receiving device, the signal receiving device comprising a signal receiver, an active receiving antenna and a coaxial cable, the active receiving antenna being connected to the signal receiver via the coaxial cable; A clothing suspension device, the clothing suspension device comprising a blower, an air outlet pipe and a clothing fixing rack, the blower is connected to the air outlet pipe through a pipeline, and the clothing fixing rack is mounted above the air outlet pipe; and a hemispherical moving device, the hemispherical moving device comprising a semi-ring frame, a supporting base, a semi-ring driving unit and a sliding vehicle, the semi-ring frame is pivotally mounted on the supporting base, the semi-ring driving unit drives the semi-ring frame to rotate, the semi-ring frame is provided with a semicircular ring slide rail, the sliding vehicle is slidably mounted on the semicircular ring slide rail, and the signal transmitting device is fixedly mounted on the sliding vehicle; It also includes a shielding room, wherein the signal transmitting device, the signal receiving device hemispherical moving device, the air outlet pipe and the clothing fixing rack are arranged in the shielding room, the blower is arranged outside the shielding room, and an air outlet is arranged on the top of the shielding room; The signal receiving device also includes a fixed sleeve, a movable rod and a positioning bolt. The bottom of the fixed sleeve is fixed to the center of the clothing fixing rack. The movable rod can be longitudinally slidably sleeved in the fixed sleeve and is locked and connected to the fixed sleeve through the positioning bolt. The active receiving antenna is fixed to the top of the movable rod. The coaxial cable passes through the fixed sleeve and the movable rod to be connected to the active receiving antenna circuit.

2. The multi-directional electromagnetic radiation shielding effectiveness testing device for three-dimensional finished fabrics according to claim 1 is characterized in that: The clothing fixing rack is provided with an annular groove with a T-shaped cross-section, and a plurality of clamps are arranged in the annular groove. The clamps include an adjusting bolt, an adjusting nut, a rope and a clamp. The bolt head of the adjusting bolt is slidably arranged in the annular groove, and the adjusting bolt is fixed to the clothing fixing rack by a threaded locking connection with the adjusting nut. The upper and lower ends of the rope are respectively connected to the adjusting bolt and the clamp. The clothing fixing rack and the clamp are made of insulating materials.

3. The multi-directional electromagnetic radiation shielding effectiveness testing device for three-dimensional finished fabrics according to claim 1 is characterized in that: The air outlet pipe is provided with an opening adjusting device, wherein the opening adjusting device is fixedly mounted on the opening at the top of the air outlet pipe and is used to control the size of the opening at the top of the air outlet pipe. The opening adjusting device comprises an opening adjusting collar, an opening and closing blade, an opening adjusting rod, an opening adjusting rack, an opening adjusting gear, an opening adjusting worm, an opening adjusting base and an opening adjusting handle. The opening adjusting base is fixedly mounted on the side wall of the air outlet pipe, the opening adjusting collar is coaxially and rotatably sleeved on the air outlet pipe, the opening and closing blades and the opening adjusting rod are the same in number, and each opening and closing blade closes the opening at the top of the air outlet pipe when closed, an opening and closing rotating shaft is provided at one end of the opening and closing blade, and a driving rod is provided at the other end, an opening driving strip groove is provided on the opening adjusting rod, and the driving rod end of the opening and closing blade is slidably matched with the opening driving strip groove, the opening adjusting rack is fixedly mounted on the opening adjusting collar, the opening adjusting gear and the opening adjusting worm are pivotally mounted on the opening adjusting base, the two sides of the opening adjusting gear are respectively meshed with the opening adjusting rack and the opening adjusting worm, and the opening adjusting handle is fixedly mounted on the opening adjusting worm.

4. The multi-directional electromagnetic radiation shielding effectiveness testing device for three-dimensional finished fabrics according to claim 3 is characterized in that: The number of the opening and closing blades is 5, and the connecting surface between adjacent opening and closing blades is a curved surface.

5. The multi-directional electromagnetic radiation shielding effectiveness testing device for three-dimensional finished fabrics according to claim 1 is characterized in that: The semi-ring driving unit comprises a semi-ring servo motor, and the semi-ring servo motor drives the semi-ring frame to rotate along a horizontal axis.

6. The multi-directional electromagnetic radiation shielding effectiveness testing device for three-dimensional finished fabrics according to claim 1 is characterized in that: The sliding vehicle includes a frame, rollers, sliding gears, a sliding servo motor and a semi-annular rack fixed on a semi-ring frame. The frame is pivotally provided with two rollers, and the rollers are slidingly provided in a semi-circular slide rail. The sliding gear is pivotally provided on the frame, and the sliding gear is meshed with the semi-circular rack. The sliding servo motor drives the sliding gear to rotate. The semi-ring frame is a semi-circular ring, and a sliding conductive track is provided in the semi-circular slide rail. The signal source is slidingly and conductively connected to the sliding conductive track.

7. A method for detecting the electromagnetic radiation shielding effectiveness of three-dimensional fabrics from multiple directions, using the detection device according to any one of claims 1 to 6 for detection, characterized in that: The following steps are involved: Step 1: Adjust the clamp to a suitable position on the finished fabric fixing frame and lock the clamp, wrap the clothing to be tested with the active receiving antenna from top to bottom, and clamp the bottom of the finished fabric with a clip; Step 2: The blower blows air into the air outlet pipe, and the opening adjustment device is adjusted to make the air outlet pipe open to a suitable opening size. The blower guides the air into the finished fabric, so that the finished fabric is suspended in the air; Step 3: The active transmitting antenna generates an electromagnetic radiation signal, and the active receiving antenna set in the finished fabric receives the electromagnetic radiation signal and transmits the signal to a signal receiver to measure the electromagnetic radiation shielding effect; Step 4: The active transmitting antenna can be controlled to move within a hemispherical periphery centered on the finished fabric through a hemispherical moving device to simulate the electromagnetic radiation shielding effect when the radiation source is at different orientations of the finished fabric.

8. The multi-directional electromagnetic radiation shielding effectiveness detection method for three-dimensional fabrics according to claim 7, characterized in that: When the finished fabric is a coat, the front and back fabrics of the coat are connected by yarns of the same material as the finished fabric, so as to prevent the coat from becoming round under the action of air blowing; When the finished fabric is trousers, the waist opening of the trousers is clamped on the clamp, and the wind from the blower is blown into the waist opening of the trousers.

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