Ground penetrating radar air wave velocity calibration device

Abstract

The utility model discloses a ground penetrating radar air wave velocity calibration device, and relates to the technical field of ground penetrating radar calibration. The device comprises a box body with double doors, a radar antenna, a clamp, a metal plate, a controller, a refrigerating device, a heating device and a temperature sensor are installed in the box body, the temperature sensor is used for detecting the air temperature during measurement, and the refrigerating device and the heating device are used for adjusting the air to an ideal temperature interval. The method has the beneficial effect of improving the normalization and precision of wave velocity calibration. And secondly, the radar antenna is mounted by adjusting the distance between the clamp and the metal plate to a proper height, so that the trouble of mounting in the air can be avoided, and the problem of falling of the radar antenna can be prevented. In addition, the transmission mechanism, the distance measuring sensor, the first motor and the second motor can automatically detect distance measurement and adjust the height of the radar antenna, so that data are more real and reliable. Finally, universal wheels are arranged below the box body, so that the box body is convenient to move; meanwhile, due to the integrated design, the device can be repeatedly used at high frequency in different environments.

Description

Technical Field

[0001] The utility model relates to the technical field of ground penetrating radar calibration, in particular to a ground penetrating radar air wave velocity calibration device. Background Technique

[0002] Ground penetrating radar has been widely used in engineering detection fields such as the paving quality of highway road surfaces, underground pipelines, underground structures, detection of lining defects and cavities behind linings of tunnel structures, and geological advanced prediction, becoming a new and efficient important detection method. The accuracy of the detection results of ground penetrating radar is directly related to the performance of the instrument and equipment itself and the uncertainty of the test system. However, due to the lack of national specifications or procedures for calibrating ground penetrating radar, the calibration of ground penetrating radar and the evaluation of uncertainty have always been difficult problems faced by experimental detection institutions. After retrieval, it is found that in the prior art, the main ideas for designing a ground penetrating radar wave velocity correction device are as follows:

[0003] The utility model patent "A ground penetrating radar self-calibration device and a ground penetrating radar self-calibration system (Patent No.: 201820167610.4)". In this patent, an antenna height adjustment frame, multiple layers of brackets, and a placement box are set, and a metal plate is horizontally placed at the bottom for vertical calibration. In this patent, the positions of the radar antenna and the metal plate can only be moved and judged by people, and the positions of each layer of brackets are fixed, which is not conducive to flexible variation of the ranging.

[0004] The utility model patent "A ground penetrating radar self-calibration device (Patent No.: 201920841319.5)". This patent also adopts the vertical calibration method. Although this patent solves the problem of insufficient flexibility in ranging adjustment in the patent with Patent No. 201820167610.4, the radar antenna in this patent is not provided with a fixture and is easy to fall from a height.

[0005] The published invention patent "A ground penetrating radar comprehensive calibration measurement device (Patent No.: 202310158227.8)". Although this patent fixes the ground penetrating radar and solves the clamping of different sizes of ground penetrating radars through adjustable fixtures, it can be seen from the patent specification and drawings that the fixture is installed in mid-air. During the process of adjusting the size of the fixture to install the ground penetrating radar, multiple adjustments are required or multiple people are needed to participate in the installation and adjustment, and the installation process is not convenient. At the same time, there is still a risk of falling from the air.

[0006] In summary, the prior art has made improvements and contributions to the wave velocity calibration of ground penetrating radar, relatively improving the measurement accuracy and convenience. However, generally speaking, there are still the following deficiencies that need to be solved urgently:

[0007] 1. In the prior art, when measuring the air wave velocity with a ground penetrating radar, it is directly measured while being exposed to the air. However, in fact, the temperature of the ground penetrating radar itself and the air temperature will both affect the transmission rate of electromagnetic waves to a certain extent. Therefore, strictly speaking, when measuring the air wave velocity, the temperature should be maintained at an ideal constant value or constant range, such as between 20°C and 25°C, to avoid the temperature differences in the air environment between the north and the south, and between winter and summer, which may affect the measurement accuracy.

[0008] 2. The calibration device in the prior art is not very suitable for use in the field or on-site engineering departments. The detection radar is used in the engineering field and is easily affected by the harsh on-site environment and human factors and becomes inaccurate. If it is necessary to ensure the accuracy of each measurement, it needs to be frequently transferred to a specific place or institution for calibration, which is very inconvenient.

[0009] 3. In the prior art, the fixture is not convenient for disassembling and assembling the radar antenna. When calibrating ground penetrating radars of different types or models, it is necessary to manually adjust the size of the fixture. When placed in mid-air or installed in mid-air, multiple adjustments or the participation of multiple people are required. Moreover, the radar antenna has a certain weight and is relatively easy to slip from mid-air during installation or movement.

[0010] Based on the above analysis, in order to solve the problems existing in the above practical process, the inventor team has conducted long-term discussions and research, and combined with the consultation and suggestions of relevant manufacturers, a ground penetrating radar air wave velocity calibration device is proposed to effectively make up for the above deficiencies. Summary of the Utility Model

[0011] Aiming at the deficiencies of the prior art, the present utility model provides a ground penetrating radar air wave velocity calibration device, which solves the problems in the prior art such as the air environment temperature not meeting the calibration requirements during measurement, the fixture being inconvenient to install the radar antenna and easy to slip, and the limited places required for measurement.

[0012] To achieve the above objectives, the present utility model is realized through the following technical solutions: It includes a box body, which includes a housing with a front opening, an upper baffle installed on the upper part of the front opening of the housing and a lower baffle installed on the lower part, conduction columns installed on the outer surfaces of both sides of the housing, a double-door installed between the upper baffle and the lower baffle and rotatably connected to the housing, and four universal wheels installed at the bottom of the housing;

[0013] It further includes a placement plate fixed to the inner wall of the housing. The placement plate is flush with the upper edge of the lower baffle, and has air flow holes on both sides and a groove in the middle. A metal plate is placed in the groove; it also includes a transmission mechanism, an adjustable fixture, and a radar antenna. The adjustable fixture can move up and down along the transmission mechanism, and the radar antenna is connected to the transmission mechanism through the adjustable fixture;

[0014] It also includes a control system, which includes a battery pack, a refrigeration device, a heating device installed under the placement board, a touch screen installed on the outer surface of the upper baffle, and a temperature sensor. All the devices in the above control system are communicatively connected to a controller installed under the placement board in the control system.

[0015] Further, the transmission mechanism includes a moving plate, and the adjustable fixture includes two mounting bars fixed to the front and rear of the lower surface of the moving plate, two limiting rods fixed to both ends of the mounting bars, and a moving cavity passing through the two limiting rods and slidable thereon; two sets of adjustable fixtures are symmetrically installed under the moving plate.

[0016] Further, the moving cavity includes stress rods fixed to both ends inside the moving cavity, sliding blocks passing through the stress rods and movable thereon, two springs respectively fixed to two sides of the sliding blocks and both ends inside the moving cavity, and a threaded bolt threadedly connected to the bottom of the sliding block.

[0017] Further, a rotatable connecting device is sleeved on the lower end of the threaded bolt. The connecting device is a hook or an internal thread sleeve, and the hook or the internal thread sleeve is respectively matched with a hanging ring and a threaded post on the radar antenna.

[0018] Further, the internal thread sleeve is horizontally provided with a through hole, a safety pin rotatably sleeved on the threaded bolt is arranged above the internal thread sleeve, and a pin hole matched with the through hole and the safety pin is arranged on the threaded post on the radar antenna.

[0019] Further, the transmission mechanism also includes a first transmission component, a second transmission component, and a motor helical gear; a set of the first transmission component is installed in each of the conduction columns on both sides. The first transmission component includes a first lead screw connected to the upper and lower surfaces inside the conduction column through a bearing wheel, a moving block threadedly sleeved on the first lead screw, and a first helical gear installed at the bottom of the first lead screw;

[0020] Vertical guide grooves are provided at the conduction columns on both sides inside the housing. The two sides of the moving plate are symmetrically provided with connecting handles respectively. The ends of the connecting handles pass through the vertical guide grooves and are fixed to the moving blocks;

[0021] Two sets of the second transmission component are symmetrically arranged under the moving plate and are composed of a connecting rod and two helical gears two fixed to both ends thereof. One of the helical gears two is vertically meshed with the first helical gear, and the other is vertically meshed with the motor helical gear; the control system also includes a first motor. The rotor of the first motor is fixed to the motor helical gear and is communicatively connected to the controller.

[0022] Further, it further includes a conveying device, which includes a connecting plate, an upper plate, a lower plate, a second lead screw, and a force-receiving block fixed to the inner wall of the housing; the connecting plate, the upper plate, and the lower plate form a "mouth" - shaped structure; two moving grooves are formed on the other two sides of the placing plate, the connecting plate can move in the moving grooves, and the upper plate and the lower plate are respectively located above and below the placing plate; the control system further includes a second motor and a ranging sensor, the second motor is installed on the lower surface of the placing plate, the ranging sensor is installed on the upper surface of the upper plate, and both are communicatively connected to the controller; one end of the second lead screw is fixed to the second motor, and the other end is rotatably connected to the force-receiving block.

[0023] Further, it further includes a lifting platform, which includes two groups of cross bars and a table top, one end of the cross bar is rotatably connected to the housing, and the other end is rotatably connected to the table top; a data collector can be placed on the table top, and a cable hole is provided at the top of the housing.

[0024] Further, the metal plate is made of ferromagnetic material, and its size is 1000mm×1100mm.

[0025] Further, the given air temperature range value required to be detected by the temperature sensor is 20°C - 25°C.

[0026] The utility model provides a ground penetrating radar air wave velocity calibration device, which has the following beneficial effects:

[0027] 1. In the utility model, the box body has double doors, and also includes a controller, a touch screen, a temperature sensor, a refrigeration device, and a heating device in the control system. After closing the double doors, the temperature sensor detects the air environment temperature inside the housing, and then turns on the refrigeration device or the heating device to make the air temperature meet the measurement requirements range. This technical solution improves the influence that the traditional calibration process ignores the fact that the air temperature will affect the electromagnetic wave transmission rate, makes the calibrated wave velocity more accurate, and makes the calibration real and reliable.

[0028] 2. In the utility model, devices such as a metal plate, a radar antenna, and a fixture are placed inside the box body, and universal wheels are installed at the bottom of the box body, making the calibration device an integrated whole. The integrated design enables the device to be applicable to various environments, is also convenient for movement, can be batch - repeated and measured at high frequencies, and is especially suitable for use in the engineering department on - site or professional testing institutions.

[0029] 3. In the utility model, when disassembling and assembling the radar antenna, the moving plate can be slid to a position very close to the metal plate, and the radar antenna is placed on the metal plate or the placing plate for installation. This technical solution does not require lifting the radar antenna for installation, is easy to operate, can be completed by one person, and also avoids the risk of falling during disassembly and assembly in mid - air.

[0030] 4. In the present utility model, by using a transmission mechanism, a ranging sensor, a controller, a first motor, a second motor, and a touch screen in a control system, the height distance between the bottom surface of a radar antenna and a metal plate can be automatically detected. At the same time, the height can be automatically adjusted to meet different height distance measurement requirements. This technical solution improves the ranging accuracy compared with the method of using a tape measure to measure distance in the traditional technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic three-dimensional structure diagram of the calibration device of the present utility model;

[0032] Figure 2 It is a schematic diagram of the structure and installation position of the transmission mechanism and the control system of the present utility model;

[0033] Figure 3 It is a schematic diagram of the structure of the adjustable fixture of the present utility model;

[0034] Figure 4 For the present utility model Figure 3 Enlarged structure schematic diagram at the position;

[0035] Figure 5 It is a schematic diagram of the structure of the internal thread sleeve, the threaded bolt, and the safety bolt of the present utility model;

[0036] Figure 6 It is a schematic diagram of the structure of the conveying device of the present utility model;

[0037] Figure 7 It is a schematic diagram of the structure of the radar antenna of the present utility model;

[0038] Figure 8 It is a schematic diagram of the communication connection structure of the control system of the present utility model.

[0039] In the figure: 1. Box body; 11. Shell; 111. Cable hole; 112. Vertical guide groove; 12. Upper baffle; 13. Conductive column; 14. Double-door; 15. Lower baffle; 16. Universal wheel; 2. Placing board; 21. Air hole; 22. Moving groove; 23. Metal plate; 3. Bearing wheel; 4. Lifting platform; 41. Cross bar; 42. Table top; 43. Data collector; 5. Control system; 51. Touch screen; 52. Temperature sensor; 53. Conductive rod; 54. Battery pack; 55. Controller; 56. Refrigeration device; 57. Heating device; 58. Distance measuring sensor; 59. Motor II; 6. Transmission mechanism; 61. First transmission component; 611. Moving block; 612. First lead screw; 613. First helical gear; 62. Second transmission component; 621. Second helical gear; 622. Connecting rod; 63. Moving plate; 631. Connecting handle; 64. Motor helical gear; 7. Conveyor device; 71. Connecting plate; 72. Upper plate; 73. Lower plate; 74. Second lead screw; 75. Force-bearing block; 8. Adjustable clamp; 81. Mounting strip; 82. Limiting rod; 83. Moving cavity; 831. Spring; 832. Force-bearing rod; 833. Threaded bolt; 834. Sliding block; 835. Through hole; 836. Safety bolt; 9. Radar antenna. Detailed implementation mode

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0041] Embodiment

[0042] Reference Figure 1-8 Referring to

[0043] It also includes a placement plate 2 fixed to the inner wall of the housing 11. The placement plate 2 is flush with the upper edge of the lower baffle 15, and there are air flow holes 21 on both sides thereof for the up-and-down flowing and exchanging of air, and there is a groove in the middle. A metal plate 23 is placed in the groove. More preferably, the metal plate 23 is made of a ferromagnetic material, and its size is 1000mm×1100mm. It also includes a transmission mechanism 6, an adjustable fixture 8, and a radar antenna 9. The adjustable fixture 8 can move up and down along the transmission mechanism 6, and the radar antenna 9 is connected to the transmission mechanism 6 through the adjustable fixture 8.

[0044] It also includes a control system 5. The control system 5 includes a battery pack 54, a refrigeration device 56, a heating device 57 installed below the placement plate 2, and a touch screen 51 installed on the outer surface of the upper baffle 12. It also includes a temperature sensor 52. All the devices in the above control system 5 are communicatively connected to a controller 55 installed below the placement plate 2 in the control system 5.

[0045] In a more preferred technical solution, the air temperature set value range is set to 20°C - 25°C, that is, the given air temperature range value required to be detected by the temperature sensor 52 is 20°C - 25°C.

[0046] In a more preferred technical solution, after the radar antenna 9 moves, the vertical height from its bottom surface to the center point of the metal plate 23 is 200mm, 400mm, 600mm, and 800mm respectively. The radar air wave velocity is measured at the above heights respectively.

[0047] In the above technical solution, when measuring the radar air wave velocity, the double doors 14 are closed tightly. The temperature sensor 52 detects the air temperature inside the housing 11. When it is lower than the preset value, such as 20°C - 25°C, the controller 55 controls the heating device 57 to work. When it is higher than the preset value, the refrigeration device 56 is controlled to work. When the detected air temperature is within the preset range, the height of the radar antenna 9 is adjusted through the transmission mechanism 6. The height value from the bottom surface of the radar antenna 9 to the center of the metal plate 23 to be measured for speed is input on the touch screen 51 respectively, such as 200mm or 400mm or 600mm or 800mm. Then, multiple groups of wave velocity measurements are carried out at each height value, the average value is calculated, and compared with the standard wave velocity to calibrate the radar antenna 9. This technical solution can adjust and limit the air temperature for speed measurement, can be used in various regions or seasons, improves the measurement accuracy; at the same time, the integrated design is convenient to move to any place where calibration is needed and can be batch-repeatedly calibrated.

[0048] Refer to the appendix Figure 3, a better technical solution. The transmission mechanism 6 includes a moving plate 63. The temperature sensor 52 can be installed on the upper surface of the moving plate 63. The adjustable fixture 8 includes two mounting bars 81 fixed to the front and rear of the lower surface of the moving plate 63, two limiting rods 82 with both ends fixed to the mounting bars 81, and two sets of moving cavities 83 penetrating through the two limiting rods 82 and slidable thereon; two sets of adjustable fixtures 8 are symmetrically installed below the moving plate 63.

[0049] Refer to the appendix Figure 4 , further, the moving cavity 83 includes force rods 832 fixed to both ends inside the moving cavity 83, sliding blocks 834 penetrating through the force rods 832 and movable thereon, two springs 831 respectively fixed to two sides of the sliding blocks 834 and both ends inside the moving cavity 83, and threaded bolts 833 threadedly connected to the bottoms of the sliding blocks 834.

[0050] Refer to the appendix Figure 3 , 4 , 7, further, a rotatable connecting device is sleeved on the lower end of the threaded bolt 833. The connecting device is a hook or an internal thread sleeve, and the hook or the internal thread sleeve respectively matches the hanging ring and the threaded column on the radar antenna 9.

[0051] Refer to the appendix Figure 4 and 7 , further, the internal thread sleeve is horizontally provided with a through hole 835, a safety pin 836 rotatably sleeved on the threaded bolt 833 is arranged above the internal thread sleeve, and a pin hole matching the through hole 835 and the safety pin 836 is arranged on the threaded column of the radar antenna 9.

[0052] For the above technical solution, during specific implementation, according to the model and size of the radar antenna 9, move and adjust the positions of the moving cavities 83 at the four corners, and at the same time move and adjust the positions of the sliding blocks 834, and then connect with the radar antenna 9 through the hook or the internal thread sleeve. This technical solution can be applicable to radar antennas 9 of different types and sizes, improving the application range of the wave velocity calibration of the radar antenna 9. In addition, during installation, the moving plate 63 can be adjusted downward to a position where the radar antenna 9 can be installed on the metal plate 23, so as to avoid the inconvenience and even dropping when the radar antenna 9 needs to be lifted during installation in mid-air.

[0053] Refer to the appendix Figure 2 , a better technical solution. The transmission mechanism 6 further includes a first transmission component 61, a second transmission component 62, and a motor helical gear 64; one set of the first transmission component 61 is installed in each of the two conduction columns 13 on both sides. The first transmission component 61 includes a first lead screw 612 connected to the upper and lower surfaces inside the conduction column 13 through a bearing wheel 3, a moving block 611 threadedly sleeved on the first lead screw 612, and a first helical gear 613 installed at the bottom of the first lead screw 612.

[0054] On both sides of the conduction columns 13 inside the housing 11, vertical guide grooves 112 are provided. On both sides of the moving plate 63, connection handles 631 are symmetrically provided respectively. The ends of the connection handles 631 pass through the vertical guide grooves 112 and are fixed to the moving blocks 611.

[0055] Two sets of the second transmission components 62 are symmetrically arranged below the moving plate 63 and are composed of a connecting rod 622 and two second bevel gears 621 fixed at both ends thereof. One of the second bevel gears 621 is vertically meshed with the first bevel gear 613, and the other is vertically meshed with the motor bevel gear 64; the control system 5 further includes a first motor 53. The rotor of the first motor 53 is fixed to the motor bevel gear 64 and is communicatively connected to the controller 55. During specific implementation, since the second bevel gear 621 needs to rotate, during design, the mounting base raises the connecting rod 622 to a position where it does not affect the rotation of the second bevel gear 621.

[0056] For the above technical solution, after inputting the height distance to be measured on the touch screen 51, the controller 55 commands the first motor 53 to rotate. Through the meshing rotation of the motor bevel gear 64 and the second bevel gear 621, and the meshing rotation of the second bevel gear 621 and the first bevel gear 613, finally, the moving block 611 on the rotating lead screw 612 is driven to move, completing the adjustment of the height distance between the bottom surface of the radar antenna 9 and the metal plate 23. For this technical solution, the ranging adjustment is automatically completed. Compared with the traditional technology of measuring distance with a tape measure, it not only ensures the accuracy of the distance but also has the feature of intelligence. In addition, by driving the two moving blocks 611 to move simultaneously with the same motor, it is ensured that the bottom surface of the radar antenna 9 and the metal plate 23 always remain parallel and do not tilt, ensuring that the angle of wave velocity measurement is always perpendicular to the metal plate 23.

[0057] Refer to the appendix Figure 6 For a better technical solution, it further includes a conveying device 7. The conveying device 7 includes a connecting plate 71, an upper plate 72, a lower plate 73, a second lead screw 74, and a force-bearing block 75 fixed to the inner wall of the housing 11; the connecting plate 71, the upper plate 72, and the lower plate 73 form a "mouth" - shaped structure; two moving grooves 22 are provided on the other two sides of the placing plate 2. The connecting plate 71 can move in the moving grooves 22. The upper plate 72 and the lower plate 73 are respectively located above and below the placing plate 2; the control system 5 further includes a second motor 59 and a ranging sensor 58. The second motor 59 is installed on the lower surface of the placing plate 2, and the ranging sensor 58 is installed on the upper surface of the upper plate 72, and both are communicatively connected to the controller 55; one end of the second lead screw 74 is fixed to the second motor 59, and the other end is rotatably connected to the force-bearing block 75.

[0058] In the above technical solution, when it is necessary to change the height distance between the bottom surface of the radar antenna 9 and the metal plate 23, during the process of adjusting the distance, it is necessary to keep the ranging sensor 58 directly below the radar antenna 9 all the time. Therefore, when it is necessary to adjust the height distance, the controller 55 commands the second motor 59 to rotate, and the conveying device 7 starts to operate. After the upper plate 72 moves from the position on the side of the placing plate 2 to directly below the bottom surface of the radar antenna 9, the first motor 53 is started. When the ranging sensor 58 detects that the height distance of the radar antenna 9 conforms to the preset value input by the touch screen 51, the first motor 53 stops, and the second motor 59 rotates in the reverse direction to make the upper plate 72 return to the side of the placing plate 2. During specific implementation, since the ranging sensor 58 and the upper plate 72 itself have a certain height, this part of the height value needs to be considered during design.

[0059] Refer to the appendix Figure 1 A more optimal technical solution further includes a lifting platform 4. The lifting platform 4 includes two groups of cross bars 41 and a table top 42. One end of the cross bar 41 is rotatably connected to the housing 11, and the other end is rotatably connected to the table top 42. A data collector 43 can be placed on the table top 42. A cable hole 111 is opened at the top of the housing 11, and after passing the cable through the cable hole 111, it is sealed. Since the data collector 43 is required to cooperate with the radar antenna 9 during the process of calibrating the radar wave velocity, a lifting platform 4 with adjustable height is provided on the upper surface of the housing 11, and the data collector 43 is placed on it to facilitate the operation of different staff.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0061] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A ground penetrating radar air wave velocity calibration device, comprising a housing (1), the housing (1) comprising a shell (11) with a front opening, an upper baffle (12) mounted on the upper part of the front opening of the shell (11) and a lower baffle (15) mounted on the lower part, conductive columns (13) mounted on the outer surfaces of both sides of the shell (11), a double-opening door (14) mounted between the upper baffle (12) and the lower baffle (15) and rotatably connected to the shell (11), and four universal wheels (16) mounted on the bottom of the shell (11); Features: It also includes a placement plate (2) fixed to the inner wall of the housing (11), the placement plate (2) being flush with the upper edge of the lower baffle (15), and having air flow holes (21) on both sides and a groove in the middle, in which a metal plate (23) is placed; it also includes a transmission mechanism (6), an adjustable clamp (8) and a radar antenna (9), the adjustable clamp (8) being movable up and down along the transmission mechanism (6), and the radar antenna (9) being connected to the transmission mechanism (6) via the adjustable clamp (8); The device also includes a control system (5), wherein the control system (5) includes a battery pack (54) installed below the placement plate (2), a refrigeration device (56), a heating device (57), a touch screen (51) installed on the outer surface of the upper baffle (12), and a temperature sensor (52). The devices in the above control system (5) are all connected to a controller (55) installed below the placement plate (2) in the control system (5).

2. The ground penetrating radar air wave velocity calibration device according to claim 1, characterized in that: The transmission mechanism (6) comprises a movable plate (63), and the adjustable clamp (8) comprises two mounting bars (81) fixed to the front and rear of the lower surface of the movable plate (63), two limit rods (82) with both ends fixed to the mounting bars (81), and a movable cavity (83) penetrating the two limit rods (82) and slidable thereon; two sets of the adjustable clamp (8) are symmetrically installed below the movable plate (63).

3. The ground penetrating radar air wave velocity calibration device according to claim 2, characterized in that: The movable cavity (83) comprises a force-bearing rod (832) fixed at two ends of the movable cavity (83), a sliding block (834) penetrating the force-bearing rod (832) and movable thereon, two springs (831) respectively fixed at two side surfaces of the sliding block (834) and at two ends of the movable cavity (83), and a threaded bolt (833) threadably connected to the bottom of the sliding block (834).

4. The ground penetrating radar air wave velocity calibration device according to claim 3, characterized in that: The lower end of the threaded bolt (833) is sleeved with a rotatable connection device, the connection device being a hook or an internally threaded sleeve, the hook or the internally threaded sleeve respectively matching the lifting ring and the threaded column on the radar antenna (9).

5. The ground penetrating radar air wave velocity calibration device according to claim 4, characterized in that: The internally threaded sleeve is provided with a through hole (835) in the transverse direction, a safety latch (836) rotatably sleeved on the threaded bolt (833) is provided above the internally threaded sleeve, and a latch hole matching the through hole (835) and the safety latch (836) is provided on the threaded column on the radar antenna (9).

6. The air wave velocity calibration device for ground penetrating radar according to any one of claims 2 to 5, characterized in that: The transmission mechanism (6) further comprises a transmission component 1 (61), a transmission component 2 (62), and a motor bevel gear (64); the transmission component 1 (61) is installed in each of the two transmission columns (13) on both sides, and the transmission component 1 (61) comprises a screw rod 1 (612) connected to the upper and lower sides of the transmission column (13) through a bearing wheel (3), a moving block (611) threadedly sleeved with the screw rod 1 (612), and a bevel gear 1 (613) installed at the bottom of the screw rod 1 (612); Vertical guide grooves (112) are provided at the conductive columns (13) on both sides of the housing (11), and the movable plate (63) has connecting handles (631) symmetrically on both sides, and the ends of the connecting handles (631) pass through the vertical guide grooves (112) and are fixed to the movable block (611); The transmission assembly 2 (62) is symmetrically arranged in two groups below the moving plate (63), and is composed of a connecting rod (622) and two bevel gears 2 (621) fixed at both ends thereof, one of the bevel gears 2 (621) being vertically meshed with the bevel gear 1 (613), and the other being vertically meshed with the motor bevel gear (64); the control system (5) also includes a motor 1 (53), the rotor of the motor 1 (53) being fixed to the motor bevel gear (64), and being communicatively connected to the controller (55).

7. The ground penetrating radar air wave velocity calibration device according to claim 1, characterized in that: The device also includes a conveying device (7), the conveying device (7) including a connecting plate (71), an upper plate (72), a lower plate (73), a second screw rod (74), and a force-bearing block (75) fixed to the inner wall of the housing (11); the connecting plate (71), the upper plate (72), and the lower plate (73) form a "mouth"-shaped structure; two moving grooves (22) are provided on the other two sides of the placement plate (2), the connecting plate (71) can move in the moving grooves (22), and the upper plate (72) and the lower plate (73) are respectively located above and below the placement plate (2); the control system (5) also includes a second motor (59) and a distance measuring sensor (58), the second motor (59) is mounted on the lower surface of the placement plate (2), and the distance measuring sensor (58) is mounted on the upper surface of the upper plate (72), and both are communicatively connected to the controller (55); one end of the second screw rod (74) is fixed to the second motor (59), and the other end is rotatably connected to the force-bearing block (75).

8. The ground penetrating radar air wave velocity calibration device according to claim 1, characterized in that: It also includes a lifting platform (4), the lifting platform (4) including two groups of cross rods (41) and a table top (42), one end of the cross rod (41) is rotatably connected to the shell (11), and the other end is rotatably connected to the table top (42); a data acquisition device (43) can be placed on the table top (42), and a cable hole (111) is opened on the top of the shell (11).

9. The ground penetrating radar air wave velocity calibration device according to claim 1, characterized in that: The metal plate (23) is made of ferromagnetic material and has a size of 1000 mm×1100 mm.

10. The ground penetrating radar air wave velocity calibration device according to claim 1, characterized in that: The temperature sensor (52) is required to detect a given air temperature interval value of 20°C-25°C.

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