A space radiation test antenna calibration device

Abstract

The utility model proposes a space radiation test antenna calibration device, including a track, a first pulley limited to move forward and backward on the track, a first motor for driving the first pulley to move, an automatic lifting frame installed on the first pulley, and an antenna installed on the automatic lifting frame, wherein the track and the table are located in a straight line; the first motor is located at the rear end of the track away from the table, and the first motor is connected to the first pulley through a lead screw located in the track. The space radiation test antenna calibration device is limited to a fixed track, and the distance between the antenna and the table is calibrated by a motor drive, which can not only accurately control the movement but also prevent it from tipping over; the space radiation test antenna calibration device uses a grating ruler and a reading head to replace manual measurement to accurately control the moving distance; the space radiation test antenna calibration device can quickly disassemble and replace the antenna through a coupling structure.

Description

Technical Field

[0001] The utility model relates to the technical field of testing equipment, in particular to a space radiation testing antenna calibration device. Background Art

[0002] Space radiation testing is a routine test item in electromagnetic compatibility and radio frequency for CE certification, FCC certification, etc. It can be used to measure the radiated disturbance field strength of the EUT (equipment under test) propagating through space during operation, and evaluate the impact of electromagnetic radiation emitted by the EUT on surrounding equipment and systems. The test measures the radiated power of the device within a specific frequency range and compares it with relevant standards to ensure that the radiation level of the device meets the specified limits.

[0003] The space radiation test needs to be conducted in a darkroom. A table is placed in the darkroom to place the EUT. A movable antenna is placed near the table. The radiation signal received by the antenna is then led to the receiver outside the darkroom through a coaxial cable to obtain the radiation emission data of the EUT. According to the test requirements, the antenna may be a log-periodic antenna, a loop antenna, or a horn antenna. The antenna needs to be able to adjust the distance from the EUT and be able to rise and fall back and forth within 1-4 meters. It also needs to ensure that the test antenna can switch freely between horizontal and vertical polarizations and cooperate with the test turntable to find the maximum emission position.

[0004] In order to achieve the above purpose, the current antenna mounting frame is equipped with rollers at the bottom, and the mounting frame is manually moved after precise measurement, or the distance between the antenna and the EUT is adjusted through the telescopic arm on the mounting frame. However, the mounting frame is in contact with the ground through the rollers, and the center of gravity moves forward after the antenna is extended, which can easily cause the device to fall over. In addition, the position of the mounting frame is manually positioned and placed, and the position needs to be manually re-positioned and confirmed before each project. There is a risk of being considered to be moved during the test, which will also cause errors in the measurement results. Utility Model Content

[0005] In view of the defects of the background technology, the utility model proposes a space radiation test antenna calibration device, which is restricted on a fixed track and drives the calibration antenna to adjust the distance between the antenna and the table through a motor, which can not only accurately control the movement but also prevent it from tipping over.

[0006] The utility model proposes a space radiation test antenna calibration device, comprising a track, a first pulley limited to move forward and backward on the track, a first motor used to drive the first pulley to move, an automatic lifting frame installed on the first pulley, and an antenna installed on the automatic lifting frame, wherein the track and a table are located in a straight line; the first motor is located at the rear end of the track away from the table, and the first motor is connected to the first pulley through a lead screw located in the track.

[0007] Preferably, a grating ruler is installed on the track, and the first pulley is installed with a reading head matching the grating ruler.

[0008] Preferably, the track is a single-track straight groove track, and the lead screw is suspended in the groove body of the track;

[0009] The first pulley comprises a frame, a guide member and at least two pairs of wheels, the guide member is centrally fixed at the bottom of the frame, and the wheels are symmetrically arranged on both sides of the bottom of the frame;

[0010] The guide member is located in the groove body of the track. The left and right sides of the guide member are respectively provided with first limit rollers that roll in contact with the groove walls on both sides of the track. The guide member also has a central screw hole, and the lead screw is passed through the central screw hole and threadedly connected thereto.

[0011] Preferably, a pair of fin plates are provided on the left and right sides of the track, and at least a pair of clamp arms extend opposite to the pair of fin plates on the left and right sides of the frame. An elastically retractable brake block is provided in each clamp arm, and the brake block is provided with a jaw for clamping the fin plate. An electromagnet for controlling the extension and retraction of the brake block is provided on the outer periphery of the side of the brake block facing away from the fin plate, and the electromagnet is fixedly connected to the bottom of the frame.

[0012] Preferably, a positioning notch is provided on the front end shell of the clamp arm close to the jaws, the height of the positioning notch is slightly greater than the thickness of the fin plate, and the fin plate corresponding to the positioning notch passes through the positioning notch without contacting the clamp arm.

[0013] Preferably, the automatic lifting frame includes a support rod installed on the top of the frame, a second motor installed on the top of the frame and located on one side of the support rod, a chain vertically arranged on the support rod and transmission-connected to the second motor, and a second pulley moving with the chain, and the antenna is fixedly connected to the second pulley.

[0014] Preferably, a vertical track groove is provided on the support rod, the second pulley is located in the vertical track groove, and second limiting rollers are provided on the left and right sides of the second pulley for rolling contact with the groove wall of the vertical track groove.

[0015] Preferably, the space radiation test antenna calibration device further comprises a third motor and an antenna fixing frame, the outside of the antenna fixing frame is fixedly connected to the second pulley, the inside of the antenna fixing frame is provided with a cavity, and the third motor is installed in the cavity;

[0016] An antenna tail shaft is arranged at the rear end of the antenna, and a rotating shaft of the third motor is connected to the antenna tail shaft through a coupling.

[0017] Preferably, the antenna tail shaft is waist-shaped, the coupling is provided with a waist-shaped slot for inserting the antenna tail shaft, and a long notch that can be inserted into the antenna tail shaft is provided in a portion of the waist-shaped slot close to the end surface.

[0018] Preferably, a slot sleeve is screwed onto the outside of the waist-shaped slot, the outer peripheral surface of the slot sleeve is provided with hand-tightening lines, and the outer wall thickness of the waist-shaped slot gradually expands radially outwards in the direction of the antenna.

[0019] The beneficial effects of the utility model include: the space radiation test antenna calibration device is restricted on a fixed track, and the distance between the antenna and the table is calibrated by a motor drive, which can not only accurately control the movement but also prevent it from tipping over; the space radiation test antenna calibration device uses a grating ruler and a reading head to replace manual measurement to accurately control the moving distance; the space radiation test antenna calibration device can quickly disassemble and replace the antenna through a coupling structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is described in detail below with reference to the embodiments and drawings, wherein:

[0021] Figure 1 It is an assembly schematic diagram of the utility model space radiation test antenna calibration device.

[0022] Figure 2 It is a top view of the space radiation test antenna calibration device of the utility model.

[0023] Figure 3 It is a horizontal cross-sectional view of the automatic lifting frame of the utility model.

[0024] Figure 4 It is a vertical cross-sectional view of the first pulley of the utility model.

[0025] Figure 5 It is an assembly diagram of the third motor, antenna fixing frame, coupling and antenna of the utility model.

[0026] Reference numerals:

[0027] 1-track, 11-screw, 12-fin plate, 2-first pulley, 21-frame, 22-guide, 23-wheel, 24-first limit roller, 25-center screw hole, 26-brake block, 261-jaw, 27-clamp arm, 271-positioning notch, 28-electromagnet, 3-first motor, 4-automatic lifting frame, 41-support rod, 42-second motor, 43-chain, 44-second pulley, 45-vertical track groove, 46-second limit roller, 5-antenna, 51-antenna tail shaft, 61-grating ruler, 62-reading head, 7-third motor, 8-antenna fixing frame, 9-coupling, 91-waist-shaped slot, 92-long notch, 93-slot sleeve, 94-hand-tight texture, 100-table. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0030] The principle of the present utility model is described in detail below with reference to the accompanying drawings and embodiments.

[0031] Reference Figure 1-5 The utility model proposes a space radiation test antenna calibration device, comprising a track 1, a first trolley 2 limited to move forward and backward on the track 1, a first motor 3 for driving the first trolley 2 to move, an automatic lifting frame 4 installed on the first trolley 2, and an antenna 5 installed on the automatic lifting frame 4. The track 1 and a table 100 on which the device to be tested is placed are located in a straight line; the first motor 3 is located at the rear end of the track 1 away from the table 100, and the first motor 3 is connected to the first trolley 2 through a lead screw 11 located in the track 1. The space radiation test antenna calibration device is limited on the track 1, and the distance between the antenna and the table is calibrated by the motor drive, which can not only accurately control the movement, but also prevent it from tipping over.

[0032] In this embodiment, the track 1 is a straight groove track of a single track, and the lead screw 11 is suspended in the groove of the track 1; the first pulley 2 includes a frame 21, a guide 22 and two pairs of wheels 23, the guide 22 is fixed at the bottom of the frame 21 in the center, and the wheels 23 are symmetrically arranged on both sides of the bottom of the frame 21; the guide 22 is located in the groove of the track 1, and the left and right sides of the guide 22 are respectively provided with first limit rollers 24 that are in rolling contact with the groove walls on both sides of the track 1, and the guide 22 is also provided with a central screw hole 25, and the lead screw 11 is passed through the central screw hole 25 and is threadedly connected thereto. The first pulley 2 is equivalent to the base of the space radiation test antenna calibration device, which mainly relies on two pairs of wheels 23 to bear weight, and the lead screw 11 is made of steel material, which is easy to bend and deform under long-term stress. Under the restriction of the groove of the track 1, the guide 22 will not move sideways when moving, which can avoid the friction between the first pulley 2 and the track 1 affecting the precise movement.

[0033] In this embodiment, a grating ruler 61 is installed on the track 1, and a reading head 62 matching the grating ruler 61 is installed at the bottom of the first pulley 2. The control system of the space radiation test antenna calibration device uses the position signal fed back by the reading head 62 to more accurately control the rotation speed and rotation distance of the first motor 3, thereby achieving more accurate control of the moving distance of the first pulley 2.

[0034] In this embodiment, a brake block 26 is installed for the first pulley 2, and the brake is synchronously applied when the first motor 3 stops to prevent the first pulley 2 from continuing to move under the inertia of itself and the first motor 3. The specific scheme includes: a pair of fins 12 are provided on the left and right sides of the track 1, and at least a pair of clamp arms 27 are extended in opposite directions from the left and right sides of the frame 21 to the pair of fins 12, and an elastically retractable brake block 26 is provided in each clamp arm 27, and the brake block 26 is provided with a jaw 261 for holding the fins tightly, and an electromagnet 28 for controlling the extension and retraction of the brake block 26 is provided on the outer periphery of the side of the brake block 26 facing away from the fins, and the electromagnet 28 is fixedly connected to the bottom of the frame 21. When the first motor 3 rotates, the electromagnet 28 is synchronously energized to attract the brake block 26 to retract and separate from the fin 12; when the first motor 3 stops, the electromagnet 28 is synchronously de-energized, and the brake block 26 approaches the fin 12 under the action of elastic force, and finally holds the fin 12 tightly through the jaw 261 to use friction to stop the first pulley 2 quickly. In order to ensure that the jaws 261 can smoothly hold the fins 12, a positioning notch 271 is provided on the front end housing of the clamp arm 27 near the jaws 261. The height of the positioning notch 271 is slightly greater than the thickness of the fins 12. The fins 12 corresponding to the positioning notch 271 pass through the positioning notch 271 and do not contact the clamp arm 27. If the bottom surface is uneven and causes the first pulley 2 to have a tendency to deviate up and down relative to the guide rail, the fins 12 will limit the tendency of the first pulley 2 to move up and down within the height range of the positioning notch 271 through the positioning notch 271, so as to avoid the jaws 261 of the brake block 26 from being unable to align with the fins 12 when parking.

[0035] In this embodiment, the automatic lifting frame 4 includes a support rod 41 installed on the top of the frame 21, a second motor 42 installed on the top of the frame 21 and located on one side of the support rod 41, a chain 43 vertically arranged on the support rod 41 and connected to the second motor 42, and a second pulley 44 moving with the chain 43, and the antenna 5 is fixedly connected to the second pulley 44. A vertical track groove 45 is provided on the support rod 41, and the second pulley 44 is located in the vertical track groove 45. The left and right sides of the second pulley 44 are provided with second limit rollers 46 that are in rolling contact with the groove wall of the vertical track groove 45. When the height of the antenna 5 needs to be adjusted, the second motor 42 drives the second pulley 44 to rise and fall along the vertical track groove 45 through the chain 43, and the antenna 5 will rise and fall with the second pulley 44.

[0036] In this embodiment, the space radiation test antenna calibration device further includes a third motor 7 and an antenna fixing frame 8. The third motor 7 is used to control the horizontal rotation of the antenna 5 and change the angle between the antenna 5 and the device under test. The outside of the antenna fixing frame 8 is fixedly connected to the second pulley 44, which is used to fix the antenna 5 and protect the third motor 7. The inside of the antenna fixing frame 8 is provided with a cavity, and the third motor 7 is installed in the cavity. The rear end of the antenna 5 is provided with an antenna tail shaft 51, and the rotating shaft of the third motor 7 is connected to the antenna tail shaft 51 through a coupling 9.

[0037] According to the test requirements, the antenna 5 may be replaced with a logarithmic periodic antenna, a loop antenna or a horn antenna. In order to quickly disassemble and assemble, the antenna tail shaft 51 in this embodiment is waist-shaped, and the coupling 9 is provided with a waist-shaped slot 91 for inserting the antenna tail shaft 51. The waist-shaped slot 91 is provided with a long strip notch 92 near the end surface, which can be inserted into the antenna tail shaft 51. The outside of the waist-shaped slot 91 is screwed with a slot sleeve 93, and the outer peripheral surface of the slot sleeve 93 is provided with a hand-tightening pattern 94, and the outer wall thickness of the waist-shaped slot 91 gradually expands radially outward in the direction of the antenna 5. When replacing the antenna 5, the slot sleeve 93 is manually rotated to the side away from the antenna 5, and then the antenna tail shaft 51 is inserted into the waist-shaped slot 91 along the long strip notch 92. After being inserted, the antenna tail shaft 51 is pushed to continue to be inserted into the waist-shaped slot 91. After being fully inserted, the slot sleeve 93 is manually rotated to reset. Since the wall thickness of the waist-shaped slot 91 on the side close to the antenna 5 is slightly increased, the slot sleeve 93 will compress the waist-shaped slot 91 to shrink and hold the antenna tail shaft 51 after being reset. The conventional installation method of the antenna 5 is to directly align the antenna tail shaft 51 with the notch of the waist-shaped slot 91 and insert it. However, the length, volume and weight of the test antenna 5 are relatively large, and it is difficult for a single person to align the notch. The technical solution of this embodiment is to move a part of the antenna tail shaft 51 to the long notch 92, and then use the support of the notch 92 to straighten the antenna 5, and then it can be easily inserted into the waist-shaped slot 91, so that the antenna 5 can be replaced by a single person.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A space radiation test antenna calibration device, characterized in that: It includes a track, a first pulley restricted to move forward and backward on the track, a first motor for driving the first pulley to move, an automatic lifting frame installed on the first pulley, and an antenna installed on the automatic lifting frame, wherein the track and the table are located in a straight line; the first motor is located at the rear end of the track away from the table, and the first motor is connected to the first pulley through a lead screw located in the track.

2. The space radiation test antenna calibration device according to claim 1, characterized in that: A grating ruler is installed on the track, and a reading head matching the grating ruler is installed on the first pulley.

3. The space radiation test antenna calibration device according to claim 2, characterized in that: The track is a single-track straight groove track, and the lead screw is suspended in the groove body of the track; The first pulley comprises a frame, a guide member and at least two pairs of wheels, the guide member is centrally fixed at the bottom of the frame, and the wheels are symmetrically arranged on both sides of the bottom of the frame; The guide member is located in the groove body of the track, and the left and right sides of the guide member are respectively provided with first limiting rollers that are in rolling contact with the groove walls on both sides of the track. The guide member is also provided with a central screw hole, and the lead screw is passed through the central screw hole and is threadedly connected thereto.

4. The space radiation test antenna calibration device according to claim 3, characterized in that: A pair of fin plates are provided on the left and right sides of the track, and at least a pair of clamp arms extend opposite to the pair of fin plates on the left and right sides of the frame. An elastically retractable brake block is provided in each clamp arm, and the brake block is provided with a jaw for clamping the fin plate. An electromagnet for controlling the extension and retraction of the brake block is provided on the outer periphery of the side of the brake block facing away from the fin plate, and the electromagnet is fixedly connected to the bottom of the frame.

5. The space radiation test antenna calibration device according to claim 4, characterized in that: A positioning notch is provided on the front end shell of the clamp arm close to the jaw, the height of the positioning notch is slightly greater than the thickness of the fin plate, and the fin plate corresponding to the positioning notch passes through the positioning notch and does not contact the clamp arm.

6. The space radiation test antenna calibration device according to claim 3, characterized in that: The automatic lifting frame includes a support rod installed on the top of the frame, a second motor installed on the top of the frame and located on one side of the support rod, a chain vertically arranged on the support rod and transmission-connected to the second motor, and a second pulley moving with the chain, and the antenna is fixedly connected to the second pulley.

7. The space radiation test antenna calibration device according to claim 6, characterized in that: The support rod is provided with a vertical track groove, the second pulley is located in the vertical track groove, and the left and right sides of the second pulley are provided with second limiting rollers that are in rolling contact with the groove wall of the vertical track groove.

8. The space radiation test antenna calibration device according to claim 7, characterized in that: The space radiation test antenna calibration device also includes a third motor and an antenna fixing frame, the exterior of the antenna fixing frame is fixedly connected to the second pulley, the interior of the antenna fixing frame is provided with a cavity, and the third motor is installed in the cavity; An antenna tail shaft is arranged at the rear end of the antenna, and the rotating shaft of the third motor is connected to the antenna tail shaft through a coupling.

9. The space radiation test antenna calibration device according to claim 8, characterized in that: The antenna tail shaft is waist-shaped, and the coupling is provided with a waist-shaped slot for inserting the antenna tail shaft. The waist-shaped slot is provided with a long notch near the end surface for inserting the antenna tail shaft.

10. The space radiation test antenna calibration device according to claim 9, characterized in that: The outside of the waist-shaped slot is threadedly connected with a slot sleeve, the outer peripheral surface of the slot sleeve is provided with hand-tightening lines, and the outer wall thickness of the waist-shaped slot gradually expands radially outwards in the direction of the antenna.

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