Loading device based on neutron photography experiment table

Abstract

The invention relates to a loading device based on a neutron photography experiment table, which comprises a neutron emission mechanism, the neutron emission mechanism comprises a neutron generator, the neutron generator is slidably sleeved with a shell, two rotating shafts are rotatably connected in the shell, and the two rotating shafts are coaxially and fixedly connected with adjusting gears. A tooth groove meshed with the adjusting gear is formed in the outer wall of the neutron generator, and one ends of the two rotating shafts rotationally penetrate through the shell and are in transmission connection through a gear set; the detection mechanism is used for detecting the neutron photographing result and comprises a sliding plate, the sliding plate is fixedly connected with the shell through an arc-shaped plate, a mounting plate is arranged on the side, close to the neutron generator, of the sliding plate, and the mounting plate is fixedly connected with the sliding plate through a telescopic rod. Compared with the prior art, neutron photographing can be carried out on articles of different sizes, the photographing angle is convenient to adjust, the detection plate is convenient to replace, and the height of the articles is convenient to adjust.

Description

Technical Field

[0001] The invention relates to the field of neutron radiography, in particular to a loading device based on a neutron radiography experimental table. Background Art

[0002] Neutron photography is a technology that uses the attenuation of neutron beams when they penetrate objects to show the internal structure of certain objects. According to the energy of the neutrons used, neutron photography can be divided into: cold neutron photography, thermal neutron photography and fast neutron photography. Neutrons are provided by neutron sources. Reactor neutron sources are the most suitable neutron sources for neutron photography. Other neutron sources can also be used. If thermal neutron photography is to be performed, appropriate moderators should be placed around the source to slow down fast neutrons into thermal neutrons. If cold neutrons with lower energy are required, a cold neutron moderator is installed in the reactor. The collimator makes the neutrons emitted by the source form parallel or divergent neutron beams to improve the resolution of the photo. Commonly used image detectors are mainly X-ray photographic film and digital detectors such as CCD. Because neutrons cannot be detected directly, a conversion screen is required. Neutrons interact with the conversion screen to emit α, β or γ radiation, making it easy to record on photographic film. Fluorescent substances can also be added to convert charged particles into visible light and record them using digital detectors such as CCD.

[0003] When placing the photographed object in the existing neutron photography loading device, when setting different shooting centers for the object, it is necessary to manually adjust the height of the object, which is inconvenient to adjust. In addition, when shooting the object at different angles, it is necessary to frequently adjust the placement of the object, and position shift is prone to occur during placement, resulting in certain differences in shooting results. When shooting objects of different sizes, due to the difference in size, the shooting distances of objects of different sizes are different when shooting the objects. At the same time, due to the change in distance, the neutron intensity generated by the shooting neutron generator also needs to be adjusted accordingly, which is inconvenient to adjust. Therefore, different neutron photography equipment needs to be used for shooting. However, different neutron photography equipment has its perfect shooting size, and cannot guarantee perfect shooting of objects of the current size. Therefore, the photos taken by the neutron photography equipment are not necessarily perfect, and shooting has certain limitations.

[0004] Therefore, based on the above problems, we invented a loading device based on a neutron radiography experimental platform. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a loading device based on a neutron photography experimental table, which has the advantages of a wide range of applications, high precision and convenient adjustment of the position of the photographed object, and solves a series of problems such as the inconvenience of adjusting the height of the photographed object, easy deviation during adjustment, and a small range of application during neutron photography.

[0006] To achieve the above object, the present invention provides the following technical solution: a loading device based on a neutron radiography experimental table, comprising: The circular rings 25 are symmetrically arranged in two groups and are connected and fixed to each other through the base 16, forming the main frame of the loading device; A neutron emission mechanism is installed between the two groups of rings and is used to generate neutrons for neutron photography. The neutron emission mechanism includes a neutron generator. A housing is slidably mounted outside the neutron generator. Two rotating shafts are rotatably connected inside the housing. Adjustment gears are coaxially fixedly connected to the two rotating shafts. A tooth groove meshing with the adjustment gear is provided on the outer wall of the neutron generator. One end of the two rotating shafts rotates through the housing and is connected through a gear set. A detection mechanism is installed between the two groups of rings and is used to detect the neutron radiography results. The detection mechanism includes a slide plate, which is fixedly connected to the housing through an arc plate. A mounting plate is provided on the side of the slide plate close to the neutron generator. The mounting plate and the slide plate are fixedly connected through a telescopic rod. The end of the mounting plate away from the slide plate is detachably connected to the detection plate through a clamping mechanism. The loading mechanism is installed between the two groups of rings and is used to place the object to be photographed. The neutron emission mechanism and the detection mechanism are symmetrical relative to the loading mechanism.

[0007] Furthermore, the loading mechanism includes a vertical plate fixedly connected to the upper end of the base, a cavity is provided in the vertical plate, four first screws are rotatably connected in the cavity, the four first screws are transmission connected by a first transmission mechanism, a first motor is installed in the cavity, the driving shaft of the first motor is coaxially fixedly connected to one of the first screws, a threaded sleeve is threadedly sleeved on the outside of the four first screws, the upper ends of the four threaded sleeves slide through the vertical plate and are fixedly connected to the placement plate, a placement plate is provided above the vertical plate, and a clamping mechanism is provided on the placement plate.

[0008] Furthermore, the upper ends of the two circular rings are fixedly installed with the same U-shaped plate, a driving gear is provided inside the U-shaped plate, a tooth groove meshing with the driving gear is provided on the arc plate, and a second motor is fixedly installed outside the U-shaped plate, and the driving shaft of the second motor rotates through the U-shaped plate and is coaxially fixedly connected with the driving gear.

[0009] Furthermore, the gear set includes two first gears and two second gears, the two first gears are rotatably connected to the shell, the two first gears are meshingly connected, the two second gears are coaxially fixedly connected to two rotating shafts, and the two second gears are meshingly connected to the two first gears, and a third motor is fixedly installed outside the shell, and the drive shaft of the third motor is coaxially fixedly connected to one of the first gears.

[0010] Furthermore, the clamping mechanism includes a clamping slot arranged on the side wall of the mounting plate, a bidirectional screw rod is rotatably connected in the clamping slot, the bidirectional screw rod is externally threaded with two L-shaped clamping plates, the bidirectional screw rod outer sleeve is provided with two springs, the two ends of the two springs are respectively fixedly connected to the L-shaped clamping plate and the inner side wall of the clamping slot, a T-shaped clamping slot is provided on the side wall of the detection plate, the T-shaped clamping slot matches the two L-shaped clamping plates, one end of the bidirectional screw rod is rotatably passed through the mounting plate and is coaxially fixedly connected with a turning handle.

[0011] Furthermore, the first transmission mechanism includes four first pulleys, the four first pulleys are coaxially fixedly connected to four first screw rods respectively, and the four first pulleys are connected through synchronous belt transmission.

[0012] Furthermore, the clamping mechanism includes two fixed plates fixedly connected to the upper ends of the placement plates, two clamping plates are arranged between the two fixed plates, the side walls opposite to each other of the two clamping plates are fixedly connected with a second screw, the end of the second screw away from the clamping plate slides through the fixed plate, the two second screw external threads are sleeved with a rotating sleeve, the two rotating sleeves are rotatably installed on the side walls opposite to the two fixed plates respectively, a transmission shaft is rotatably penetrated on the placement plate, the transmission shaft and the two rotating sleeves are connected in transmission via a second transmission mechanism, a fourth motor is fixedly installed on the side wall of the placement plate, and the drive shaft of the fourth motor is coaxially fixedly connected to the transmission shaft.

[0013] Furthermore, the second transmission mechanism includes a second pulley and a third pulley, the second pulley is coaxially fixedly connected to the transmission shaft, the third pulley is coaxially fixedly connected to the rotating sleeve, and the second pulley and the third pulley are connected via a synchronous belt transmission.

[0014] Furthermore, the external threads of the two second screws have opposite rotation directions.

[0015] Furthermore, a scale is engraved on the outer wall of the neutron generator.

[0016] Compared with the prior art, the present invention provides a loading device based on a neutron radiography experimental table, which has the following beneficial effects: 1. A loading device based on a neutron photography experimental table is provided with a neutron emission mechanism. Before photographing objects of different sizes, a third motor is used to drive two first gears to rotate, the two first gears drive two second gears to rotate, the two second gears drive two rotating shafts to rotate, the two rotating shafts drive two adjusting gears to rotate, and the two adjusting gears drive the neutron generator to move until it reaches a suitable position. The photographing distance can be adjusted according to the size of the object currently to be photographed to achieve a perfect photographing distance, thereby realizing photographing of objects of different sizes. The adjustment is convenient, and the photographing has a wide range of applications.

[0017] 2. The loading device based on the neutron photography experimental table is provided with a detection mechanism. By rotating the rotating handle, the rotating handle drives the bidirectional screw to rotate, and the bidirectional screw drives the two L-shaped card plates to move relative to each other until they are in a suitable position. Then the detection plate is replaced, and the driving gear is driven by the second motor to rotate, and the driving gear drives the arc plate to rotate, and the arc plate drives the shell and the slide plate to rotate synchronously, and the arc plate drives the neutron generator to rotate, and the slide plate drives the detection plate to rotate, so that a certain inclination can be formed between the neutron generator and the photographed object for shooting, and the shooting angle is convenient to adjust. After the shooting is completed, it is convenient to replace the detection plate.

[0018] 3. The loading device based on the neutron photography experimental table sets a loading mechanism, and drives the transmission shaft to rotate through the fourth motor, and the transmission shaft drives the two rotating sleeves to rotate, and the two rotating sleeves drive the two second screws to move relative to each other, and the two second screws drive the two clamping plates to move relative to each other until the object is fixed, and then drives the four first screws to rotate through the first motor, and the four first screws drive the four threaded sleeves to rise and fall, and the threaded sleeves drive the placement plate to rise and fall until it is in a suitable position, so that the height of the object can be adjusted, and when selecting the shooting center of the object, it can be selected according to the height of the object, which is convenient to use.

[0019] The present invention can perform neutron photography on objects of different sizes, the photography angle can be adjusted conveniently, the detection plate can be replaced conveniently, and the height of the object can be adjusted conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a front structural perspective view of the present invention; Figure 3 It is a perspective view of the structure of the neutron emission mechanism in the present invention; Figure 4 A perspective view of the mechanism of the mounting plate and the detection plate in the present invention; Figure 5 It is a structural perspective view of the loading mechanism in the present invention; Figure 6 for Figure 5 The enlarged view of point A in the middle; Figure 7 It is a schematic diagram of the cross-sectional structure of the placement plate in the present invention; Figure 8 It is a schematic diagram of the structure of the splint in the present invention; Fig. 9 It is a structural schematic diagram of the U-shaped plate in the present invention.

[0021] In the figure: 1, neutron emission mechanism; 2, neutron generator; 3, housing; 4, rotating shaft; 5, adjusting gear; 6, gear set; 7, detection mechanism; 8, slide plate; 9, third pulley; 10, arc plate; 11, mounting plate; 12, telescopic rod; 13, clamping mechanism; 14, detection plate; 15, loading mechanism; 16, base; 17, vertical plate; 18, cavity; 19, first screw; 20, first transmission mechanism; 21, first motor; 22, threaded sleeve; 23, placement plate; 24, clamp holding mechanism; 25, annular ring; 26, U-shaped plate; 27, driving gear; 28, second motor; 29, first gear; 30, second gear; 31, third motor; 32, slot; 33, bidirectional screw rod; 34, L-shaped card plate; 35, spring; 36, first pulley; 37, fixed plate; 38, clamping plate; 39, second screw rod; 40, transmission shaft; 41, second transmission mechanism; 42, fourth motor; 43, second pulley; 44, rotating sleeve; 45, T-shaped slot; 46, turning handle. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, the present application proposes a loading device based on a neutron radiography experimental table.

[0024] like Figure 1-9As shown, a loading device based on a neutron radiography experimental table includes: a ring 25, wherein the ring 25 is symmetrically arranged in two groups and is connected and fixed to each other through a base 16, forming the main frame of the loading device; a neutron emission mechanism 1, which is used to generate neutrons for neutron radiography, and the neutron emission mechanism 1 includes a neutron generator 2. It is worth mentioning that the outer wall of the neutron generator 2 is engraved with scales. It should be noted that the neutron generator 2 includes a neutron source and a collimator. The neutron source is a device that can release neutrons. There are many kinds of neutron sources, from handheld radioactive sources to research reactors and fission sources in neutron research facilities. The number of neutrons produced by the neutron source is positively correlated with the power supply voltage. The collimator makes the neutrons emitted by the source form parallel or divergent neutron beams to improve the resolution of the photo. The neutron generator 2 is slidingly sleeved with a shell 3, and two rotating shafts 4 are rotatably connected in the shell 3. The two rotating shafts 4 are coaxially fixedly connected to the outside with adjustment gears 5. The outer wall of the neutron generator 2 is provided with a tooth groove meshing with the adjustment gear 5. One end of the two rotating shafts 4 rotates through the shell 3 and is connected by a gear set 6. It should be noted that the gear set 6 includes two first gears 29 and two second gears 30. The two first gears 29 are both rotatably connected to the shell 3, and the two first gears 29 are meshed. The two second gears 30 are coaxially fixedly connected to the two rotating shafts 4 respectively, and the two second gears 30 are meshed with the two first gears 29 respectively. A third motor 31 is fixedly installed outside the shell 3, and the drive shaft of the third motor 31 is coaxially fixedly connected to one of the first gears 29.

[0025] Through the above technical features, before taking photos of objects of different sizes, the third motor 31 drives the two first gears 29 to rotate. Since the first gear 29 and the second gear 30 are meshed and connected, the two first gears 29 drive the two second gears 30 to rotate, and the two second gears 30 drive the two rotating shafts 4 to rotate. The two rotating shafts 4 drive the two adjusting gears 5 to rotate, and the two adjusting gears 5 drive the neutron generator 2 to move until it reaches a suitable position. The shooting distance can be adjusted according to the size of the object currently to be photographed, thereby realizing the photography of objects of different sizes. It should be noted that when the neutron generator 2 is far away from the photographed object, the number of neutrons generated needs to be increased to reduce the impact of neutron dispersion. Therefore, when the neutron generator 2 is far away, the power supply voltage to the neutron generator 2 is increased. The higher the voltage, the higher the number of neutrons generated by the neutron generator 2. When the neutron generator 2 is close, the power supply voltage to the neutron generator 2 is reduced. The lower the voltage, the lower the number of neutrons generated by the neutron generator 2.

[0026] In order to facilitate the replacement of the detection plate 14 and to more clearly detect the neutron radiography results, a detection mechanism 7 is provided for detecting the neutron radiography results. The detection mechanism 7 includes a slide plate 8, and the slide plate 8 is fixedly connected to the housing 3 through an arc plate 10. A mounting plate 11 is provided on the side of the slide plate 8 close to the neutron generator 2. The mounting plate 11 and the slide plate 8 are fixedly connected through a telescopic rod 12. The end of the mounting plate 11 away from the slide plate 8 is detachably connected to the detection plate 14 through a clamping mechanism 13. It should be noted that the clamping mechanism 13 is provided on the side of the slide plate 8 close to the neutron generator 2. The connecting mechanism 13 includes a slot 32 arranged on the side wall of the mounting plate 11, and a bidirectional screw rod 33 is rotatably connected in the slot 32. The bidirectional screw rod 33 is externally threaded with two L-shaped clamping plates 34, and two springs 35 are outer-circuited on the bidirectional screw rod 33. The two ends of the two springs 35 are respectively fixedly connected to the L-shaped clamping plates 34 and the inner side wall of the slot 32. A T-shaped slot 45 is provided on the side wall of the detection plate 14, and the T-shaped slot 45 matches the two L-shaped clamping plates 34. One end of the bidirectional screw rod 33 rotates through the mounting plate 11 and is coaxially fixedly connected with a rotating handle 46.

[0027] Through the above technical features, when the neutron photography is completed, when the detection plate 14 is replaced, the handle 46 is rotated, the handle 46 drives the bidirectional screw 33 to rotate, and the bidirectional screw 33 drives the two L-shaped card plates 34 to move relative to each other until they are in a suitable position, and the detection plate 14 can be replaced. When the photographed object is photographed at any angle, the second motor 28 drives the driving gear 27 to rotate, the driving gear 27 drives the arc plate 10 to rotate, the arc plate 10 drives the shell 3 and the slide plate 8 to rotate synchronously, the arc plate 10 drives the neutron generator 2 to rotate, and the slide plate 8 drives the detection plate 14 to rotate, so that a certain angle is formed between the neutron generator 2 and the photographed object for shooting.

[0028] When neutron photography is performed on an object, the object needs to be placed, so a loading mechanism 15 is provided for placing the object to be photographed. The loading mechanism 15 includes a vertical plate 17 fixedly connected to the upper end of the base 16. A cavity 18 is provided in the vertical plate 17. Four first screws 19 are rotatably connected in the cavity 18. The four first screws 19 are connected to each other through a first transmission mechanism 20. It is worth mentioning that the first transmission mechanism 20 includes four first pulleys 36. The four first pulleys 36 are coaxially fixedly connected to the four first screws 19, respectively. The four first pulleys 36 are connected to each other through a synchronous belt transmission. A first motor 21 is installed in the cavity 18, and a driving shaft of the first motor 21 is coaxially fixedly connected with one of the first screws 19. A threaded sleeve 22 is threadedly sleeved on the outside of the four first screws 19, and the upper ends of the four threaded sleeves 22 slide through the vertical plate 17 and are fixedly connected to the placement plate 23. A placement plate 23 is provided above the vertical plate 17, and a clamping mechanism 24 is provided on the placement plate 23. Furthermore, the clamping mechanism 24 includes two fixed plates 37 fixedly connected to the upper end of the placement plate 23, and two clamping plates 38 are provided between the two fixed plates 37. It is worth mentioning that the clamping plate 38 is arranged in an arc shape.

[0029] In the present invention, the side walls of the two clamping plates 38 facing each other are fixedly connected with the second screw 39. It is worth mentioning that the external threads of the two second screws 39 are in opposite directions. The end of the second screw 39 away from the clamping plate 38 slides through the fixed plate 37. The external threads of the two second screws 39 are covered with a rotating sleeve 44. The two rotating sleeves 44 are rotatably installed with the side walls of the two fixed plates 37 facing each other. A transmission shaft 40 is rotatably penetrated on the placement plate 23. The transmission shaft 40 and the two rotating sleeves 44 are connected by a second transmission mechanism 41. It should be noted that the second transmission mechanism 41 includes a second pulley 43 and a third pulley 9. The second pulley 43 is coaxially fixedly connected to the transmission shaft 40, and the third pulley 9 is coaxially fixedly connected to the rotating sleeve 44. The second pulley 43 and the third pulley 9 are connected by synchronous belt transmission. A fourth motor 42 is fixedly installed on the side wall of the placement plate 23, and the drive shaft of the fourth motor 42 is coaxially fixedly connected to the transmission shaft 40.

[0030] Through the above technical features, the object is placed on the placement plate 23, and then the fourth motor 42 drives the transmission shaft 40 to rotate, the transmission shaft 40 drives the two rotating sleeves 44 to rotate, the two rotating sleeves 44 drive the two second screws 39 to move relative to each other, and the two second screws 39 drive the two clamping plates 38 to move relative to each other until the object is fixed. After selecting the shooting center of neutron photography, the height of the object needs to be adjusted. At this time, the first motor 21 drives the four first screws 19 to rotate, the four first screws 19 drive the four threaded sleeves 22 to rise and fall, and the threaded sleeves 22 drive the placement plate 23 to rise and fall until it is in a suitable position.

[0031] The front and rear sides of the arc plate 10 are both rotatably mounted with circular rings 25, and the base 16 and the two circular rings 25 are both fixedly mounted. It should be noted that the radius of the arc plate 10 and the two circular rings 25 are the same; The upper ends of the two circular rings 25 are fixedly mounted with a same U-shaped plate 26, a driving gear 27 is arranged inside the U-shaped plate 26, and a tooth groove meshing with the driving gear 27 is arranged on the arc plate 10, and a second motor 28 is fixedly mounted outside the U-shaped plate 26, and the driving shaft of the second motor 28 rotates through the U-shaped plate 26 and is coaxially fixedly connected with the driving gear 27.

[0032] Working principle: 1) Placing an object: placing the object on the placement plate 23, and then the fourth motor 42 drives the transmission shaft 40 to rotate, the transmission shaft 40 drives the two rotating sleeves 44 to rotate, the two rotating sleeves 44 drive the two second screws 39 to move relative to each other, and the two second screws 39 drive the two clamping plates 38 to move relative to each other until the object is fixed; 2) Select the shooting center and adjust the height of the object: the first motor 21 drives the four first screws 19 to rotate, the four first screws 19 drive the four threaded sleeves 22 to move up and down, and the threaded sleeves 22 drive the placement plate 23 to move up and down until it reaches a suitable position; 3) Adjusting the position of the neutron generator 2 according to the size of the object: The third motor 31 drives the two first gears 29 to rotate. Since the first gears 29 and the second gears 30 are meshed and connected, the two first gears 29 drive the two second gears 30 to rotate. The two second gears 30 drive the two rotating shafts 4 to rotate. The two rotating shafts 4 drive the two adjusting gears 5 to rotate. The two adjusting gears 5 drive the neutron generator 2 to move until it reaches a suitable position. 4) Taking photos of objects at different angles: The second motor 28 drives the driving gear 27 to rotate, the driving gear 27 drives the arc plate 10 to rotate, the arc plate 10 drives the housing 3 and the slide plate 8 to rotate synchronously, the arc plate 10 drives the neutron generator 2 to rotate, and the slide plate 8 drives the detection plate 14 to rotate, so that a certain angle is formed between the neutron generator 2 and the photographed object for photographing; 5) After taking a photo of the object, the detection plate 14 is replaced: by rotating the handle 46, the handle 46 drives the bidirectional screw rod 33 to rotate, and the bidirectional screw rod 33 drives the two L-shaped clamping plates 34 to move relative to each other until they are in a suitable position, and the detection plate 14 can be replaced.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A loading device based on a neutron radiography test bench, characterized in that: include, The circular rings (25) are symmetrically arranged in two groups and are connected and fixed to each other via a base (16), forming the main frame of the loading device; A neutron emission mechanism (1) is installed between two groups of circular rings (25) and is used to generate neutrons for neutron photography. The neutron emission mechanism (1) comprises a neutron generator (2). A housing (3) is slidably mounted outside the neutron generator (2). Two rotating shafts (4) are rotatably connected inside the housing (3). Adjustment gears (5) are coaxially fixedly connected to the two rotating shafts (4). A tooth groove meshing with the adjustment gear (5) is provided on the outer wall of the neutron generator (2). One end of the two rotating shafts (4) rotates through the housing (3) and is connected through a gear set (6). A detection mechanism (7) is installed between the two groups of rings (25) and is used to detect the neutron radiography results. The detection mechanism (7) comprises a slide plate (8). The slide plate (8) is fixedly connected to the housing (3) via an arc plate (10). A mounting plate (11) is provided on a side of the slide plate (8) close to the neutron generator (2). The mounting plate (11) and the slide plate (8) are fixedly connected via a telescopic rod (12). The end of the mounting plate (11) away from the slide plate (8) is detachably connected to a detection plate (14) via a clamping mechanism (13). A loading mechanism (15) is installed between two groups of circular rings (25) and is used to place the object to be photographed. The neutron emission mechanism (1) and the detection mechanism (7) are symmetrical relative to the loading mechanism (15).

2. The loading device based on the neutron radiography test bench according to claim 1, characterized in that: The loading mechanism (15) comprises a vertical plate (17) fixedly connected to the upper end of the base (16); a cavity (18) is provided in the vertical plate (17); four first screw rods (19) are rotatably connected in the cavity (18); the four first screw rods (19) are transmission-connected to each other via a first transmission mechanism (20); a first motor (21) is installed in the cavity (18); a drive shaft of the first motor (21) is coaxially fixedly connected to one of the first screw rods (19); threaded sleeves (22) are threadedly sleeved on the outer surfaces of the four first screw rods (19); the upper ends of the four threaded sleeves (22) are slidably inserted through the vertical plate (17) and are fixedly connected to a placement plate (23); a placement plate (23) is provided above the vertical plate (17); a clamping mechanism (24) is provided on the placement plate (23).

3. The loading device based on the neutron radiography test bench according to claim 2 is characterized in that: The upper ends of the two circular rings (25) are fixedly mounted with a same U-shaped plate (26), a driving gear (27) is arranged inside the U-shaped plate (26), a tooth groove meshing with the driving gear (27) is arranged on the arc-shaped plate (10), and a second motor (28) is fixedly mounted outside the U-shaped plate (26), a driving shaft of the second motor (28) rotatably passes through the U-shaped plate (26) and is coaxially fixedly connected with the driving gear (27).

4. The loading device based on the neutron radiography test bench according to claim 1 is characterized in that: The gear set (6) comprises two first gears (29) and two second gears (30), the two first gears (29) are both rotatably connected to the housing (3), the two first gears (29) are meshingly connected to each other, the two second gears (30) are respectively coaxially fixedly connected to the two rotating shafts (4), and the two second gears (30) are respectively meshingly connected to the two first gears (29), and a third motor (31) is fixedly mounted outside the housing (3), and the drive shaft of the third motor (31) is coaxially fixedly connected to one of the first gears (29).

5. The loading device based on the neutron radiography test bench according to claim 1, characterized in that: The clamping mechanism (13) comprises a clamping groove (32) arranged on the side wall of the mounting plate (11), a bidirectional screw rod (33) being rotatably connected in the clamping groove (32), two L-shaped clamping plates (34) being externally threadedly sleeved on the bidirectional screw rod (33), two springs (35) being outer sleeved on the bidirectional screw rod (33), two ends of the two springs (35) being respectively fixedly connected to the L-shaped clamping plates (34) and the inner side wall of the clamping groove (32), a T-shaped clamping groove (45) being provided on the side wall of the detection plate (14), the T-shaped clamping groove (45) being matched with the two L-shaped clamping plates (34), and one end of the bidirectional screw rod (33) being rotatably penetrates the mounting plate (11) and is coaxially fixedly connected to a rotating handle (46).

6. The loading device based on the neutron radiography test bench according to claim 2, characterized in that: The first transmission mechanism (20) comprises four first pulleys (36), the four first pulleys (36) being coaxially fixedly connected to four first screw rods (19) respectively, and the four first pulleys (36) being connected to each other via a synchronous belt transmission.

7. The loading device based on the neutron radiography test bench according to claim 2 is characterized in that: The clamping mechanism (24) comprises two fixed plates (37) fixedly connected to the upper end of the placement plate (23), two clamping plates (38) are arranged between the two fixed plates (37), and the side walls opposite to each other of the two clamping plates (38) are fixedly connected to second screws (39), and the end of the second screw (39) away from the clamping plate (38) slides through the fixed plate (37), and the two second screws (39) are externally threaded with rotating sleeves (44), and the two rotating sleeves (44) are rotatably installed on the side walls opposite to each other of the two fixed plates (37), respectively, and a transmission shaft (40) is rotatably penetrated on the placement plate (23), and the transmission shaft (40) and the two rotating sleeves (44) are transmission-connected via a second transmission mechanism (41), and a fourth motor (42) is fixedly installed on the side wall of the placement plate (23), and the drive shaft of the fourth motor (42) is coaxially and fixedly connected to the transmission shaft (40).

8. The loading device based on the neutron radiography test bench according to claim 7 is characterized in that: The second transmission mechanism (41) comprises a second pulley (43) and a third pulley (9); the second pulley (43) is coaxially fixedly connected to the transmission shaft (40); the third pulley (9) is coaxially fixedly connected to the rotating sleeve (44); and the second pulley (43) and the third pulley (9) are connected via a synchronous belt transmission.

9. The loading device based on the neutron radiography test bench according to claim 7, characterized in that: The external threads of the two second screw rods (39) have opposite rotation directions.

10. The loading device based on the neutron radiography experimental platform according to claim 1, characterized in that: The outer wall of the neutron generator (2) is engraved with scale.

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