PL249100B1 - A device for inspection by means of radiation scanning - Google Patents

Abstract

A radiation scanning inspection device comprises: a radiation inspection device comprising a base part and a transverse part (3) disposed above the base part, the base part comprising a first longitudinal part (1) and a second longitudinal part (2) which are disposed at two ends of the transverse part, respectively, the first longitudinal part (1) or the second longitudinal part (2) comprising a cabin body, a radiation source, and a position adjustment mechanism, the radiation source being liftably disposed in the cabin body. The position adjustment mechanism is for lifting and lowering the radiation source. The radiation source has an operating position with a lower part lower than the lower edge of the cabin body in an operating state, and the radiation source is disposed in the cabin body in a moving state; and a travel device releasably connected at the bottom of the first longitudinal part and at the bottom of the second longitudinal part, the travel device being connected to the first longitudinal part and the second longitudinal part in an moving state.

Description

Description of the invention

REFERENCE TO RELATED SUBMISSIONS

This application claims priority from Chinese patent application No. 201910981861.5, filed on October 16, 2019, entitled “Radiation Scanning Inspection Device,” the contents of which are hereby incorporated by reference in their entirety.

FIELD OF INVENTION

The present disclosure relates to the field of radiation scanning inspection and, more particularly, to a radiation scanning inspection apparatus.

BACKGROUND OF THE INVENTION

It is essential to ensure a certain channel height when a radiation scanning inspection device is inspecting the inspected object in operation. However, in this state, the device's footprint often cannot meet the overall transport requirements during movement, and it is necessary to reduce the height during transport of the radiation scanning inspection device.

SUMMARY OF THE INVENTION

The present disclosure provides a radiation scanning inspection device having an operating state and a moving state. The radiation scanning inspection device includes:

a radiation control device comprising a base part and a transverse part disposed above the base part, the base part comprising a first longitudinal part and a second longitudinal part which are disposed at two ends of the transverse part, respectively, the first longitudinal part or the second longitudinal part comprising a cabin body, a radiation source, and a position adjusting mechanism, the radiation source being arranged in the cabin body in a lifting manner, the position adjusting mechanism being arranged to lift and lower the radiation source, the radiation source having an operating position with a bottom lower than the lower edge of the cabin body in an operating state, and the radiation source being arranged in the cabin body in a moving state; and a driving device detachably connected to the bottom of the first longitudinal part and the bottom of the second longitudinal part, the driving device being connected to the first longitudinal part and the second longitudinal part in an operating state, and the driving device being separated from the first longitudinal part and the second longitudinal part in a moving state.

In some embodiments, the height of the transverse portion in the operating state is greater than the height in the moving state. The radiation scanning inspection device further comprises:

a lifting device arranged on the base part and used to raise and lower the cross part when the working state and the moving state are switched; and a support body that is separable from the base part, wherein in the working state, the support body is arranged between the cross part and the base part, and the base part supports the cross part by the support body, and in the moving state, the support body is separated from the base part, and the cross part is directly supported on the upper end of the base part.

In some embodiments, a guide rail is arranged on the transverse portion and is slidably connected to the support body; and when the moving state is switched to the operating state, the support body slides between the base portion and the transverse portion via the guide rail.

In some embodiments, a guide device is disposed between the cross portion and the base portion, and the guide device is used to guide the raising and lowering of the cross portion.

In some embodiments, the support body comprises a first bracket disposed between the transverse portion and the first longitudinal portion and a second bracket disposed between the transverse portion and the second longitudinal portion; and the lifting device comprises a first lifting portion disposed on the first longitudinal portion and a second lifting portion disposed on the second longitudinal portion.

In some embodiments, the radiation scanning inspection device further comprises a stabilizing beam, wherein in a moving state the stabilizing beam is connected to the first longitudinal portion and the second longitudinal portion; and in an operating state the stabilizing beam is separated from the first longitudinal portion and the second longitudinal portion.

In some embodiments, the driving apparatus includes a plurality of wheel assemblies; in an operational state, the plurality of wheel assemblies are disposed at the bottom of the first longitudinal portion and the bottom of the second longitudinal portion, respectively; the radiation scanning inspection apparatus further includes a device for correcting the deviation; and the device for correcting the deviation is operative to cause the driving apparatus to maintain linear motion in the operational state.

In some embodiments, each of the wheel assemblies includes a road wheel and a drive motor for driving the road wheel for movement;

the deviation correcting device includes a linear displacement detecting device for detecting whether the driving device maintains linear motion in an operational state, and a control device; the control device is signally connected to each drive motor and the displacement detecting device; and the control device is configured such that: in the operational state, when the linear displacement detecting device detects that the travel path of the driving device deviates from a straight line, the rotational speed of each drive motor is adjusted according to the detection result of the linear displacement detecting device so that the driving device can continue linear motion.

In some embodiments, each of the wheel assemblies includes a travel wheel; the yaw correction device includes a linear displacement detection device, a control device, and at least one biasing device arranged corresponding to the travel wheel; the biasing device is operable to bias the travel direction of the corresponding wheel; the linear displacement detection device is operable to detect whether, in an operational state, the travel device is maintaining linear motion; the control device is signally coupled to the biasing device and the linear motion detection device; and the control device is configured such that: in an operational state, when the linear motion detection device detects that the travel path of the travel device deviates from a straight line, the biasing device is controlled to bias the corresponding travel wheel according to the detection result of the linear motion detection device so that the travel device can continue linear motion.

In some embodiments, the linear displacement detection device includes a laser sensor in signal communication with the controller and a laser guide line disposed along a predetermined direction of linear movement of the travel device.

In some embodiments, the yaw correcting device comprises: a guide wheel coupled to the first longitudinal portion or the second longitudinal portion; and a linear guide rail used to cooperate with the guide wheel and disposed along a linear direction of travel of the driving device.

In some embodiments, the wheel assembly comprises a rubber wheel that rides on a ground in the operational state; or the wheel assembly comprises a steel wheel that rides on a guide rail in the operational state. In some embodiments, the guide rail on which the steel wheel rides comprises a linear guide rail.

In some embodiments, the transverse portion is rigidly connected to the first longitudinal portion and the second longitudinal portion; the driving device includes a first wheel assembly, a second wheel assembly, a third wheel assembly, and a fourth wheel assembly; each of the wheel assemblies includes a wheel seat and a driving wheel rotatably mounted in the wheel seat; in an operational state, the wheel seat of the first wheel assembly and the wheel seat of the second wheel assembly are fixedly mounted at the front and rear ends of the first longitudinal portion, respectively, and the wheel seat of the third wheel assembly and the wheel seat of the fourth wheel assembly are hingedly connected to the front and rear ends of the second longitudinal portion, respectively;

the radiation scanning inspection device further comprises an alignment beam; and the front and rear ends of the alignment beam are hingedly connected to the wheel seat of the third wheel assembly and the wheel seat of the fourth wheel assembly, respectively.

In some embodiments, the wheel seat of the third wheel assembly and the wheel seat of the fourth wheel assembly are hingedly connected to the second longitudinal portion by a pivot connection, and the axes of the hinge connection are located along a parallel direction and parallel to each other; and the wheel seat of the third wheel assembly and the wheel seat of the fourth wheel assembly are hingedly connected to the leveling beam by a ball hinge connection.

In some embodiments, the wheel seat of the third wheel assembly and the wheel seat of the fourth wheel assembly are hingedly connected to the second longitudinal portion and are hingedly connected to the leveling beam by a pivot connection, and the axes of the hinge connection are located along a horizontal direction and parallel to each other.

In some embodiments, a line passing through and perpendicular to the axis of the hinge connection of the leveling beam and the wheel seat of the third wheel assembly, and passing through and perpendicular to the axis of the hinge connection of the leveling beam and the wheel seat of the fourth wheel assembly, is parallel to a line passing through and perpendicular to the axis of the hinge connection of the wheel seat of the third wheel assembly and the second longitudinal portion, and passing through and perpendicular to the axis of the hinge connection of the wheel seat of the fourth wheel assembly and the second longitudinal portion.

In some embodiments, the distance between the axis of the leveling beam's hinge connection and the wheel seat of the third wheel assembly and the axis of the leveling beam's hinge connection and the wheel seat of the fourth wheel assembly is equal to the distance between the axis of the wheel seat's hinge connection of the third wheel assembly and the second longitudinal portion and the axis of the wheel seat's hinge connection of the fourth wheel assembly and the second longitudinal portion.

In some embodiments, the radiation scanning inspection device further comprises a resilient device disposed between at least two of the driving device, the leveling beam, and the second longitudinal portion, and the resilient device is arranged to provide a resilient force to prevent the wheel seat of the third wheel assembly and the wheel seat of the fourth wheel assembly from rocking relative to the second longitudinal portion.

In some embodiments, the elastic device comprises at least one of a first elastic device, a second elastic device, and a third elastic device, wherein:

a first elastic device is arranged between the wheel seat of the third wheel assembly and the second longitudinal portion; and/or a second elastic device is arranged between the wheel seat of the fourth wheel assembly and the second longitudinal portion; and/or a third elastic device is arranged between the leveling beam and the second longitudinal portion.

In some embodiments, the range of rocking of the wheel seat of the third wheel assembly relative to the second longitudinal portion and the range of rocking of the wheel seat of the fourth wheel assembly relative to the second longitudinal portion are limited.

Based on the radiation scanning inspection apparatus provided by the present disclosure, a detachable connecting drive device is arranged at the bottom of the first longitudinal portion and the second longitudinal portion, and a radiation source is arranged to be raised and lowered by a position adjustment mechanism provided on the cabin body, so that the drive device can be removed after the state is switched to the working state; at the same time, the radiation source is raised above the lower edge of the cabin body by the position adjustment mechanism, so that the height of the radiation scanning inspection apparatus is reduced and the movement of the radiation scanning inspection apparatus is facilitated. Furthermore, the radiation source can be raised or lowered on the cabin body, and can even descend lower than the lower edge of the cabin body, so that when the radiation scanning inspection apparatus performs inspection of the object to be inspected by radiation scanning, the object to be inspected can be subjected to radiation scanning inspection at different angles multiple times, and the accuracy of the radiation scanning inspection can be improved.

Other features and advantages of the present disclosure will become apparent from the detailed description of embodiments of the present disclosure with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings described herein are provided to provide a better understanding of the present disclosure and are intended to be part of this application. The schematic embodiments of the present disclosure and their description are intended to explain the present disclosure but are not intended to constitute an undue limitation of the present disclosure.

In the attached drawing figures:

Fig. 1 is a schematic diagram of a radiation scanning inspection device according to some embodiments of the present disclosure;

Fig. 2 shows a schematic diagram of the structure of the first longitudinal part of the radiation scanning inspection device shown in Fig. 1;

Fig. 3 shows a schematic diagram of the device for inspection by means of radiation scanning shown in Fig. 1;

Fig. 4 shows a schematic diagram of the device for inspection by means of radiation scanning shown in Fig. 1;

Fig. 5 shows a schematic diagram of the cross-sectional construction in direction AA of the structure connecting the wheel seats, the second longitudinal part and the leveling beam shown in Fig. 4;

Fig. 6 is a partially enlarged diagram of part I of Fig. 5;

Fig. 7 is a diagram of the connecting structure of the wheel assembly and leveling beam shown in Fig. 4;

Fig. 8 shows a construction diagram of the wheel assembly shown in Fig. 4;

Fig. 9 shows a construction diagram of the wheel assembly of Fig. 8 from a different angle;

Fig. 10 is a schematic diagram of the construction of a wheel assembly of a radiation scanning inspection apparatus according to some other embodiments of the present disclosure;

Fig. 11 shows a construction diagram of the wheel assembly of Fig. 10 from a different angle;

Fig. 12 is a schematic diagram of a radiation scanning inspection device according to some other embodiments of the present disclosure in an operational state;

Fig. 13 is a schematic diagram of a radiation scanning inspection device according to some other embodiments of the present disclosure in an operational state;

Fig. 14 is a schematic diagram of the wheel assembly of the radiation scanning inspection device shown in Fig. 13;

Fig. 15 shows a schematic diagram of the structure of the radiation scanning inspection device shown in Fig. 1 in a moving state; and

Fig. 16 shows a partial schematic diagram of the radiation scanning inspection device shown in Fig. 1 in the operating state.

DETAILED DESCRIPTION OF THE FORM OF PERFORMANCE

The technical solutions of the embodiments of the present disclosure are expressly described with reference to the accompanying drawings of the embodiments of the present disclosure. It is understood that the described embodiments constitute only a part, and not all, of the embodiments of the present disclosure. The following description of at least one exemplary embodiment is in fact merely illustrative and does not constitute any limitation of the present disclosure and its application or use. All other embodiments realized based on the embodiments of the present disclosure by a person skilled in the art without any creative effort will fall within the scope of protection of the present disclosure.

Unless otherwise specified, the relative arrangement, numerical expressions, and values of parts and steps described in the embodiments do not limit the scope of the present disclosure. In the meantime, it is to be understood that, for convenience of description, the dimensions of each part shown in the accompanying drawings are not in true proportional relationship. Technologies, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be considered part of the approved specification. Throughout all examples shown and discussed herein, each specific value is to be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values. It is to be noted that like numerals and letters designate like elements throughout the accompanying drawings. Therefore, once a particular element is defined in one drawing, there is no need to further discuss it in subsequent drawings.

The radiation scanning inspection device shown in Fig. 1 to Fig. 16 has an operating state and a moving state. The radiation scanning inspection device includes a radiation inspection device, a cabin body (100), a radiation source 42, a position adjustment mechanism 7, and a moving device.

The radiation control device comprises a base part and a transverse part arranged above the base part; the base part comprises a first longitudinal part 1 and a second longitudinal part 2, which are arranged at two ends of the transverse part, respectively; and the first longitudinal part 1 or the second longitudinal part 2 comprises a cabin body (100), a radiation source 42 and a position adjustment mechanism 7. This means that the cabin body (100), the radiation source 42 and the position adjustment mechanism 7 are arranged on the first longitudinal part 1 or the second longitudinal part 2. In the operating state, the radiation source 42 has an operating position with a bottom lower than the lower edge of the cabin body (100), i.e. in the operating state, the radiation source 42 can drop to an operating position which is at least partially lower than the lower edge of the cabin body (100) for operation. The position adjustment mechanism 7 is used to raise and lower the radiation source 42, and the position adjustment mechanism may be a telescopic mechanism such as a hydraulic cylinder, a pneumatic cylinder, a lead screw and nut pair, and the like.

The driving device is releasably connected to the bottom of the first longitudinal portion 1 and the bottom of the second longitudinal portion 2; in the operating state, the driving device is connected to the first longitudinal portion 1 and the second longitudinal portion 2; and in the moving state, the driving device is separated from the first longitudinal portion 1 and the second longitudinal portion 2.

According to the radiation scanning inspection apparatus provided by this embodiment, a detachably connected travel device is arranged at the bottom of the first longitudinal portion 1 and the second longitudinal portion 2, and a radiation source 42 that can be raised and lowered by the position adjusting mechanism 7 is arranged on the cabin body (100) so that when the state is switched to the working state, the travel device can be dismounted; at the same time, the radiation source 42 is raised above the lower edge of the cabin body (100) by the position adjusting mechanism so that the height of the radiation scanning inspection apparatus is reduced, and the carrying of the radiation scanning inspection apparatus is facilitated. Furthermore, the radiation source 42 can be raised and lowered on the cabin body (100), and can even be lowered lower than the lower edge of the cabin body (100), so that when the radiation scanning inspection device performs inspection of an inspected object, the inspected object can be repeatedly inspected by radiation scanning at different angles, and the accuracy of the radiation scanning inspection can be improved.

In some embodiments, the radiation scanning inspection device further comprises a lifting device 62 and a support body 61. The radiation scanning inspection device may be a transmission radiation scanning inspection device, in which radiation rays are emitted from a radiation source 42 to an inspected object by passing through a gate-shaped portal inspection channel of a gantry frame, and after passing through the inspected object, the radiation rays are received by a detector to form a radiation scanning image. The radiation scanning inspection device may further be a backscatter radiation scanning inspection device; in which the detector and the radiation source 42 of the backscatter radiation scanning inspection device are positioned on the same side of the inspected object; and after the radiation source 42 emits radiation rays to the inspected object, a portion of the radiation rays are backscattered by the inspected object and are received by a detector positioned on the same side of the radiation source to form a radiation scanning image. In the inspection apparatus by scanning transmission radiation, one of the first longitudinal portion 1 and the second longitudinal portion 2 may comprise a cabin body (100) with a radiation source 42, and the other may comprise a structure such as a wall body for blocking radiation rays; and the first longitudinal portion 1 and the second longitudinal portion 2 may also comprise cabin bodies (100). In the embodiment shown in Fig. 1, the first longitudinal portion 1 comprises a cabin body (100) comprising a radiation beam 42, the radiation source 42 being a source of transmission radiation, the detector comprising a vertical detector 41 disposed on the second longitudinal portion 2 for receiving transmission radiation rays, and a transverse detector mounted below the transverse portion; and the second longitudinal portion further comprises a wall body for blocking radiation rays from being radiated outward. In some embodiments, the radiation source 42 may also be a backscattered radiation source, and at that time, both the radiation source 42 and the detector, which are arranged on the same side of the radiation source 42, are arranged on the first longitudinal portion 1.

The cross portion 3 is arranged above the base portion, and the height of the cross portion 3 in the working state is greater than the height of the cross portion 3 in the moving state; a lifting device 62 is arranged on the base portion and is used to lift and lower the cross portion 3 when the working state and the moving state are exchanged; the cross portion 3 may include a main beam as shown in Fig. 1 and Fig. 15; the lifting device 62 may comprise a telescopic rod, a pneumatic cylinder, a hydraulic cylinder, a motor-driven lead screw nut, and other telescopic mechanisms; and in the embodiments shown in Fig. 1, Fig. 15, and Fig. 16, the lifting device includes a lifting screw rod and lifts and lowers the cross portion 3 threadedly engaging the lifting screw rod 62 by rotating the lifting screw rod 62.

The supporting body 61 can be separated from the base part; and the supporting body 61 can be connected to the base part by a screw and can be separated from the base part after disassembling the screw. In the working state, the supporting body 61 is placed between the cross part 3 and the base part, and the base part supports the cross part 3 by the supporting body 61. In the moving state, the supporting body 61 is separated from the base part, and the cross part 3 is directly supported by the upper end of the base part. In the working state, the supporting body 61 is placed between the cross part 3 and the base part. Because the supporting body 61 is placed below the cross part 3, the cross part 3 has a greater height, in the working state, the supporting body 61 is only above the base part and not above the inspection channel of the radiation scanning inspection device; therefore, the radiation scanning inspection device has a higher inspection channel. When the operating state is switched to the moving state, the lifting device 62 lifts the cross section and causes the supporting body 61 to be separated from the base part and removed from the base part, and then the lifting device 62 lowers the cross section 3 so that the cross section 3 can be directly connected to the base part and the cross section 3 has a lower height in the moving state. When the radiation scanning inspection device is switched from the moving state to the operating state, the lifting device 62 again lifts the cross section, moves the supporting body 61 between the base part and the cross section 3, and lowers the cross section 3 again.

According to the radiation scanning inspection device of this embodiment, a supporting body 61 is disposed between the base part and the cross part 3; in the operating state, the supporting body 61 is disposed between the base part and the cross part 3, and the radiation scanning inspection device has a sufficient operating height; when the state is switched to the moving state, the lifting device 62 lifts the cross part 3, and then separates and removes the supporting body 61 from the base part, and the cross part 3 is directly supported on the base part after lowering, so that the height of the radiation inspection device is reduced and the movement is facilitated; and when the device is operated again, it is only necessary to re-displace the supporting body 61 between the cross part 3 and the base part. Compared with the prior art, the work of disassembling and assembling the device is reduced, which is more convenient and simpler; Meanwhile, when the state is switched back to the working state, it is no longer necessary to perform various tedious calibration work, and the state is switched more flexibly and conveniently.

In some embodiments, a guide rail 3 is arranged on the transverse portion 3 and is slidably connected to the support body 61; and when the state is switched to the moving state, the support body 61 moves into the area between the first longitudinal portion 1 and the second longitudinal portion 2 via the guide rail. As shown in Fig. 1, Fig. 15 and Fig. 16, the guide rail includes a sliding guide rail 64 arranged on the side of the transverse portion 3; when the operating state is switched to the moving state, a connecting base 63 cooperating with the sliding guide rail 64 is arranged on the support body 61, the support body 61 can slide and slide on the sliding guide rail 64 below the transverse portion 3 and move into the area between the first longitudinal portion 1 and the second longitudinal portion 2; and when the moving state is switched to the working state, the support body 61 can slide between the base part and the cross part 3 through the sliding guide rail 64 from the area between the first longitudinal part 1 and the second longitudinal part 2. In this embodiment, the support body 61 slides on the cross part 3 to be connected to and separated from the base part, which is convenient and simple; at the same time, when the support body 61 slides to be connected to the base part, due to the guiding action of the guide rail, it is also advantageous to align the support body 61 and the base part. At the same time, the support body 61 is always connected to the guide rail on the cross part 3, so that the support body 61 can always be placed on the cross part 3 and the movement of the support body 61 is facilitated.

In some embodiments, as shown in Fig. 1, Fig. 15 and Fig. 16, the fixing device is arranged on a part of the guide rail located in the area between the first longitudinal portion 1 and the second longitudinal portion 2; and in the moving state, the fixing device fixes the support body 61. In some embodiments, the fixing device includes a fixing rod 65, and the fixing device may also be a fixing block or a fixing plate; when the support body 61 moves into the area between the first longitudinal portion 1 and the second longitudinal portion 2, the fixing device may fix the support body 61, for example, a locking hole is formed on the support body 61, and the fixing rod 65 is a telescopic rod cooperating with the locking hole in a locking manner. By means of the fixing device, the support body 61 can be fixed during movement, whereby the support body 61 is more stable, and the stability during movement of the device is improved.

In some embodiments, a guiding device is arranged between the cross portion 3 and the base portion, and the guiding device is used to guide the raising and lowering of the cross portion 3. With this arrangement, the cross portion 3 can raise and lower more stably and reliably; meanwhile, when the cross portion 3 is switched from a moving state to a working state, it is easier to return to the exact working position.

In some embodiments, as shown in Fig. 1 to Fig. 3, the support body 61 includes a first bracket 611 disposed between the cross portion 3 and the first longitudinal portion 1 and a second bracket 612 disposed between the cross portion 3 and the second longitudinal portion 2; and the lifting device 62 includes a first lifting portion 621 disposed on the first longitudinal portion 1 and a second lifting portion 622 disposed on the second longitudinal portion 2. In the working state, the cross portion 3 is held by the first bracket and the second bracket on two sides, so that the cross portion 3 is more stable and reliable; and when being raised and lowered, the cross portion 3 is raised or lowered by the first lifting portion 621 and the second lifting portion 622 on two ends, so that the cross portion 3 can be raised more stably and reliably.

In some embodiments, as shown in Fig. 16, the cross portion 3 is provided with a first positioning portion 67 and the support body 61 is provided with a second positioning portion 68; and in the working state, the first positioning portion 67 cooperates with the second positioning portion 68. By the arrangement of the first positioning portion 67 and the second positioning portion 68, when the support body 61 is switched from being separated from the base portion to being connected to the base portion, the support body 61 can more quickly and accurately continue to the working position by aligning and cooperating the first positioning portion 67 and the second positioning portion 68.

In some embodiments, the base part is provided with a third positioning part 69; and in the moving state, the third positioning part 69 cooperates with the first positioning part 67. In the moving state, by cooperating with the first positioning part 67 and the third positioning part 69, the transverse part 3 can be stably and reliably positioned in a proper moving position, and the moving of the device is facilitated. In some embodiments, the first positioning part 67 is a telescopic shaft arranged on the transverse part 3, the second positioning part 68 is a first shaft hole arranged on the supporting body 61 for cooperating with a shaft in the working state, and the third positioning part is a second shaft hole for cooperating with the shaft in the moving state.

In some embodiments, as shown in Fig. 15, the radiation scanning inspection apparatus further comprises a stabilizing beam 66; in the moving state, the stabilizing beam 66 is connected to the first longitudinal portion 1 and the second longitudinal portion 2; and in the working state, the stabilizing beam 66 is separated from the first longitudinal portion 1 and the second longitudinal portion 2. By arranging the stabilizing beam 66, before the supporting body 61 is separated from the base portion and/or the travel device is separated from the first longitudinal portion 1 and the second longitudinal portion 2, the stabilizing beam 66 can be connected to the first longitudinal portion 1 and the second longitudinal portion 2, and the rigidity and stability of the apparatus are improved so that in the process of lifting the transverse portion 3, moving the supporting body 61, and dismounting the travel device, the radiation scanning inspection apparatus is more stable, and interference to other parts can be further reduced. During movement, the stabilizing beam 66 may also improve the stability of the radiation scanning inspection device.

In some embodiments, as shown in Figs. 1 to 13, the driving device includes a plurality of wheel assemblies; in the operating state, the plurality of wheel assemblies are respectively arranged at the bottom of the first longitudinal portion 1 and the second longitudinal portion 2; and the radiation scanning inspection device further includes a deflection correction device and a deflection correction device for causing the driving device to maintain linear motion. In the operating state, in some embodiments, when the driving device deviates from the linear motion, the deflection correction device is used for causing the driving device to eliminate the deflection and continue the linear motion. In some other embodiments, the deflection correction device is used for causing the driving device to always maintain linear motion without deflection during the linear motion.

According to the radiation scanning inspection apparatus provided by this embodiment, the wheel assemblies and the deviation correcting device are arranged below the first longitudinal portion 1 and the second longitudinal portion 2 of the rigid gantry frame, and the radiation scanning inspection apparatus can maintain the linearity of the displacement, so that the quality and imaging efficiency of the radiation scanning inspection of the inspected object can be improved.

In some embodiments, as shown in Figs. 1 to 9, each wheel assembly includes a road wheel and a drive motor for driving the road wheel for movement; and in some embodiments, each wheel assembly may include two road wheels and two drive motors for driving corresponding road wheels. For example, a wheel assembly with a drive motor is positioned below the first longitudinal portion 1, a wheel assembly with a drive motor is positioned below the second longitudinal portion 2, and then wheel assemblies without a motor are positioned below the first longitudinal portion 1 and the second longitudinal portion 2. In some other embodiments, each wheel assembly may further include a plurality of wheel assemblies with drive motors positioned at the lower portion of the first longitudinal portion 1 and the second longitudinal portion 2, respectively. For example, in the embodiments shown in Fig. 1 to Fig. 9, each wheel assembly includes a first wheel assembly 11 and a second wheel assembly 12 with drive motors positioned at the front and rear ends of the first longitudinal portion 1, and a third wheel assembly 13 and a fourth wheel assembly 14 with drive motors positioned at the front and rear ends of the second longitudinal portion 2. As shown in Fig. 8, the drive motor of the third wheel assembly 13 may be a third wheel drive motor 133 coupled to a wheel edge speed reduction mechanism of the third wheel assembly 13.

The deviation correction device includes a linear displacement detection device for detecting whether, in an operational state, the travel device maintains linear motion, and a control device; the control device is signal-connected to each of the driving motors and the displacement detection device; and the control device is configured such that: in an operational state, when the linear displacement detection device detects that a travel path of the travel device deviates from a straight line, the rotational speed of each of the driving motors is adjusted and controlled according to the detection result of the linear displacement detection device to make the travel device continue linear motion, that is, when the travel device deviates from a straight line, the rotational speed difference between the driving motor below the first longitudinal portion 1 and the driving motor below the second longitudinal portion 2 is controlled to perform control deviation correction of the travel device.

According to the radiation scanning control device provided by this embodiment, the wheel assembly realizes the control deviation correction by differential control, and the wheel assembly moves directly on the ground, which is suitable for situations without laying tracks and without using civil engineering.

In some embodiments, the linear displacement detection device includes a laser sensor in signal communication with the control device and a laser guide line disposed along a predetermined direction of linear movement of the driving device. For example, a laser transmitter is disposed in front of the driving device in the direction of movement to emit a laser to form a laser guide line; a laser sensor is disposed on the driving device to receive the laser guide line; and when the position of the laser guide line received by the laser sensor moves in the horizontal direction, the movement path of the driving device is detected to deviate from a straight line.

In some embodiments, each wheel assembly includes a travel wheel; the yaw correction device includes a yaw device arranged corresponding to at least one travel wheel, a linear displacement detection device, and a control device; the yaw device is operative to change the travel direction of the corresponding travel wheel; the linear displacement detection device is operative to detect whether the travel device in an operational state maintains linear motion; the control device is signally coupled to the yaw device and the linear travel device; and the control device is configured to: in an operational state, when the linear displacement detection device detects that the travel path of the travel device deviates from a straight line, control the yaw device to yaw the travel wheel in accordance with the detection result of the linear displacement detection device so that the travel device continues to maintain linear motion. The wheel assemblies may include two or more deflection wheel assemblies that are positioned correspondingly below the first longitudinal portion 1 and the second longitudinal portion 2. The deflection device may include various drive mechanisms with telescopic functions, such as a hydraulic cylinder and a pneumatic cylinder, to effect deflection of the driving wheel of the deflection wheel assembly. According to the radiation scanning inspection device provided by this embodiment, by arranging the deflection wheel assembly, the deflection correction and linear displacement can be effected by deflection of the driving wheel, and the wheel assembly moves directly on the ground so as to be used without laying tracks, without civil engineering, and without differential drive. The linear displacement detection device in this embodiment may take the form of the same device as in the previous embodiment.

In some embodiments, the wheel assembly comprises a wheel seat and a road wheel rotatably mounted in the wheel seat; as shown in Fig. 10 and Fig. 11, the wheel assembly in this embodiment comprises a deflection wheel assembly; the wheel seat of the deflection wheel assembly comprises a deflection wheel seat; the deflection wheel seat comprises a first wheel portion 201 mounted on the first longitudinal portion 1 or the second longitudinal portion 2, and a second wheel seat portion 204 for mounting a road wheel (i.e., a deflection road wheel 200) of the deflection wheel assembly; the second wheel seat portion 204 is mounted on the first wheel seat portion 201 rotatably about a vertical shaft; a pivot bearing 202 is disposed between the first wheel seat portion 201 and the second wheel seat portion 204; the deflection device comprises an electric pusher 203 in signal communication with the control device; wherein the electric pusher 203 may be formed by a motor-driven turbine worm mechanism; and the electric pusher 203 is drivingly connected to the second wheel seat portion 204 to push the second wheel seat portion 204 to pivot relative to the first wheel seat portion 201.

In some embodiments, the deflection correcting device includes a guide wheel 310 and a linear guide rail 311. The guide wheel 310 is connected to the first longitudinal portion 1 or the second longitudinal portion 2; and the linear guide rail 311 is used to cooperate with the guide wheel 310 and is disposed along a predetermined linear direction of travel of the driving device. In this embodiment, a guide wheel 310 and a linear guide rail 311 are provided, and by guiding, linear travel of the driving device can be provided. In some embodiments, as shown in Fig. 12, the wheel assembly includes a rubber wheel that travels on the ground; and by the combined action of the rubber wheel and the guide wheel 310, linear travel can be provided by guiding the guide wheel 310, and the rubber wheel can travel on the ground and bear the load, only a small amount of civil engineering is required, and the civil engineering requirements are reduced. In some embodiments, as shown in Fig. 13 and Fig. 14, the wheel assembly includes a steel wheel 301 traveling on a guide rail. The steel wheel 301, i.e., the running wheel box, must travel on the guide rail. As shown in the figure, the steel wheel 301 may be driven by a reduction motor 303, and the steel wheel 301 is connected to the first longitudinal portion 1 or the second longitudinal portion 2 by a running wheel box connecting frame 302. By connecting the guide wheel 310 and the steel wheel 301, the deviation correction and movement of the radiation scanning inspection device are performed on the guide rail, and this embodiment is applicable to sites suitable for civil engineering and guide rail laying.

In some embodiments, the guide rail on which the steel wheel 301 runs is a linear guide rail 311, that is, the steel wheel 301 and the guide wheel 310 may share one guide rail.

In some embodiments, a transverse portion 3 is attached to a first longitudinal portion 1 and a second longitudinal portion 2, the driving device includes a first wheel assembly 11, a second wheel assembly 12, a third wheel assembly 13, and a fourth wheel assembly 14; and as shown in Fig. 1 to Fig. 12, each wheel assembly includes a wheel seat and a driving wheel, a rotating shaft for autorotation of the driving wheel is arranged in the wheel seat, and the wheel seat is connected to the radiation inspection device. As shown in Fig. 1 and Fig. 2, in an operating state, the first wheel assembly 11 and the second wheel assembly 12 are fixedly mounted at the front and rear ends of the first longitudinal portion 1, the moving direction of the radiation scanning inspection device is a forward direction, and the retracting direction of the radiation scanning inspection device is a backward direction. The wheel seats of the first wheel assembly 11 and the second wheel assembly 12 may be directly attached to the first longitudinal portion 1 by welding and bolting, and, as shown in the drawing, may also be attached to the first longitudinal portion 1 by a connecting portion. For example, the first wheel seat 111 of the first wheel assembly in the figure is hingedly connected to a connecting member via an upper and lower end, respectively, and then a connecting member connected to the upper and lower ends of the first wheel seat 111 is attached to the first longitudinal portion 1 so that the first wheel seat 111 is fixedly mounted on the first longitudinal portion 1.

As shown in Fig. 1, Fig. 3, Fig. 4, Fig. 5 and Fig. 7, the wheel seats of the third wheel assembly 13 and the fourth wheel assembly 14 are hingedly attached to the second longitudinal portion 2, and the wheel seats are rotatable relative to the second longitudinal portion 2. For example, the wheel seat of the third wheel assembly comprises a third wheel seat 131, and the running wheel of the third wheel assembly comprises a third running wheel 132, wherein the third running wheel 132 is rotatable relative to the third wheel seat 131, the third wheel seat 131 is hingedly connected to the third wheel connecting portion 21, and then the third wheel connecting portion 21 is attached to the second longitudinal portion 2 such that the third wheel seat 131 is hingedly connected to the second longitudinal portion 2.

The front and rear ends of the leveling beam 15 are hingedly connected to the wheel seat of the third wheel assembly 13 and the wheel seat of the fourth wheel assembly 14.

In this embodiment, the first wheel assembly 11 and the second wheel assembly 12 of the four wheel assemblies of the running device at the bottom of the radiation inspection device are fixedly mounted to the bottom of one side of the gate frame, the third wheel assembly 13 and the fourth wheel assembly 14 are hingedly attached to the bottom of the other side of the gate frame, and the third wheel assembly 13 and the fourth wheel assembly 14 are connected by a hinged equalizing beam 15 such that the third wheel assembly 13 and the fourth wheel assembly 14 can swing a small amount relative to the gate frame. If an uneven road surface is encountered, both wheel assemblies can adaptively swing a small amount. Furthermore, the leveling beam 15 hingedly connected to the third wheel assembly 13 and the fourth wheel assembly 14 can make a slight movement to adjust the pressure of the third wheel assembly 13 and the fourth wheel assembly 14, thereby improving the uniformity of the pressure of the third wheel assembly 13 and the pressure of the fourth wheel assembly 14, better adapting to the unevenness of the road surface, ensuring the driving stability of the radiation scanning inspection device, and ensuring the effect of the radiation scanning inspection. Meanwhile, the radiation inspection device includes a rigid gate frame, and the wheel seat of the first wheel assembly 11 and the wheel seat of the second wheel assembly 12 are fixedly connected to the first longitudinal portion 1 so that when the radiation inspection device moves, the first wheel assembly 11 and the second wheel assembly 12 can support the rigid gate frame, so that the second longitudinal portion 2 is more stably supported by the third wheel assembly 13 and the fourth wheel assembly 14 by the rigid gate frame in the adaptive swinging process.

In some embodiments, the wheel seat of the third wheel assembly 13 and the wheel seat of the fourth wheel assembly 14 are hingedly connected to the second longitudinal portion 2 by a pivot connection, and the axes of the hinge connection are arranged along a horizontal direction and parallel to each other; and the wheel seat of the third wheel assembly 13 and the wheel seat of the fourth wheel assembly 14 are hingedly connected to the leveling beam 15 by a ball-and-socket hinge connection. The leveling beam 15 is connected to the wheel seat of the third wheel assembly 13 and the wheel seat of the fourth wheel assembly 14 via a ball joint and can make a slight movement at a larger number of angles, so that the uniformity of the load on the wheel seat of the third wheel assembly 13 and the wheel seat of the fourth wheel assembly 14 can be better adjusted.

In some embodiments, the wheel seat of the third wheel assembly 13 and the wheel seat of the fourth wheel assembly 14 are hingedly connected to the second longitudinal portion 2 and are hingedly connected to the leveling beam 15 by a pivot connection, and the axes of the hinge connection are all along a horizontal direction and parallel to each other. For example, the wheel seat of the third wheel assembly 13 can be rotated by the third wheel hinge pin shaft 211. As shown in Fig. 5 and Fig. 6, the leveling beam 15 can be rod-shaped, and the leveling beam 15 and the wheel seat can be hingedly connected by a pivot connection by adjusting the leveling beam hinge shaft 151.

In some embodiments, a line passing through and perpendicular to the axis of the hinge connection of the leveling beam 15 and the wheel seat of the third wheel assembly 13, and passing through and perpendicular to the axis of the hinge connection of the leveling beam 15 and the wheel seat of the fourth wheel assembly 14, is parallel to a line passing through and perpendicular to the axis of the hinge connection of the wheel seat of the third wheel assembly 13 and the second longitudinal portion 2, and passing through and perpendicular to the axis of the hinge connection of the wheel seat of the fourth wheel assembly 14 and the second longitudinal portion 2. That is, a line connecting the hinge points at two ends of the leveling beam 15 is parallel to a line connecting the hinge point of the second longitudinal portion 2 and the third wheel assembly 13 and the hinge point of the second longitudinal portion 2 and the fourth wheel assembly 14. By this arrangement, the connecting property of the third wheel assembly 13 and the fourth wheel assembly 14 can be improved; and in the case of an uneven road surface, the uniformity of the pressure distribution of the third wheel unit 13 and the fourth wheel unit 14 by the leveling beam 15 is improved, and the movement stability of the radiation scanning inspection device is further improved.

In some embodiments, the height of the wheel seat hinge axis of the third wheel assembly 13 and the second longitudinal portion 2 is the same as the height of the wheel seat hinge axis of the fourth wheel assembly 14 and the second longitudinal portion 2. With this arrangement, the third wheel assembly 13 and the fourth wheel assembly 14 can support the radiation control device more evenly and stably; and when adjusting the roll, in the case of an uneven road surface, it is easier to perform uniform pressure adjustment.

In some embodiments, the distance between the hinge axis of the leveling beam 15 and the wheel seat of the third wheel assembly 13 and the hinge axis of the leveling beam 15 and the wheel seat of the fourth wheel assembly 14 is equal to the distance between the hinge axis of the wheel seat of the third wheel assembly 13 and the second longitudinal portion 2 and the hinge axis of the wheel seat of the fourth wheel assembly 14 and the second longitudinal portion 2. That is, the hinge points between the leveling beam 15 and the wheel seat of the third wheel assembly 13 and the wheel seat of the fourth wheel assembly 14 and the hinge points between the wheel seat of the third wheel assembly 13 and the wheel seat of the fourth wheel assembly 14 and the second longitudinal portion 2 may form a parallelogram. In the case of an uneven road surface, when the leveling beam makes a small movement to adjust and distribute the pressures of the wheel assemblies at the two ends, greater height adaptability and pressure uniformity of the third wheel assembly 13 and the fourth wheel assembly 14 can be achieved, and the third wheel assembly 13 and the fourth wheel assembly 14 can support the second longitudinal portion 2 more stably.

In some embodiments, the height of the hinge axis of the leveling beam 15 and the wheel seat of the third wheel assembly 13 and the height of the hinge axis of the leveling beam 15 and the wheel seat of the fourth wheel assembly 14 are smaller than the height of the hinge axis of the wheel seat of the third wheel assembly 13 and the second longitudinal portion 2 and the height of the hinge axis of the wheel seat of the fourth wheel assembly 14 and the second longitudinal portion 2.

In some embodiments, the radiation scanning inspection device further comprises a resilient device disposed between at least two of the driving device, the leveling beam 15, and the second longitudinal portion 2; the resilient device is used to provide a resilient force to prevent the wheel seat of the third wheel assembly 13 and the wheel seat of the fourth wheel assembly 14 from rocking relative to the second longitudinal portion 2; and the resilient device may be a spring or other structures. In the case of an uneven road surface, when the third wheel assembly 13 and the fourth wheel assembly 14 adjust and swing relative to the second longitudinal portion 2, when a large obstacle is encountered on the road surface, this arrangement contributes to preventing excessive rocking of the third wheel assembly 13 and the fourth wheel assembly 14, and the support stability of the second longitudinal portion 2 may be improved during adaptive adjustment.

In some embodiments, as shown in Fig. 3, a first elastic device 51 is arranged between the wheel seat of the third wheel assembly 13 and the second longitudinal portion 2; and/or a second elastic device 52 is arranged between the wheel seat of the fourth wheel assembly 14 and the second longitudinal portion 2; and/or a third elastic device 53 is arranged between the leveling beam 15 and the second longitudinal portion 2. The arrangement of the elastic devices contributes to preventing excessive rolling of the third wheel assembly 13 and the fourth wheel assembly 14 when encountering a large obstacle and improves the stability of the device; in the meantime, a certain restoring force can be provided to the third wheel assembly 13 and the fourth wheel assembly 14, and the radiation scanning inspection device can be quickly reset upon returning to travel on a level road surface.

In some embodiments, the range of rocking of the wheel seat of the third wheel assembly relative to the second longitudinal portion and the range of rocking of the wheel seat of the fourth wheel assembly relative to the second longitudinal portion are limited. For example, a restrictor plate may be positioned within the rocking range of the wheel seat to limit rocking of the wheel seat, and the range of rocking of the wheel seat may be limited by limiting the distance between the wheel seat of the third wheel assembly 13, the wheel seat of the fourth wheel assembly 14, and/or the leveling beam 15, and the second longitudinal portion 2.

In some embodiments, the first longitudinal portion 1 is a radiation source cabin body (100) and the second longitudinal portion 2 is a wall body.

In some embodiments, the above-described control device may be a general-purpose processor for performing the function described in this disclosure, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware disassembly, or any suitable combination.

Finally, it should be noted that the above embodiments are used only to describe the technical solution according to the present disclosure, but not to limit it. Although the present disclosure is described in detail with reference to preferred embodiments, a person skilled in the art should understand that certain embodiments of the present disclosure can still be modified or part of the technical features can be equivalently replaced, which should fall within the scope of the technical solutions claimed in the present disclosure.

Claims (20)

Patent claims 1. A radiation scanning inspection device, characterized in that it has an operating state and a moving state, and comprises: a radiation control device comprising a base part and a cross part (3) arranged above the base part, the base part comprising a first longitudinal part (1) and a second longitudinal part (2) which are arranged at two ends of the cross part (3), respectively, the first longitudinal part (1) or the second longitudinal part (2) comprising a cabin body (100), a radiation source and a position adjustment mechanism (7), the radiation source (42) being arranged to allow the cabin body (100) to be raised, the adjustment mechanism (7) being configured to raise and lower the radiation source, the radiation source (42) having an operating position with a lower part lower than a lower edge of the cabin body (100) in an operating state, and the radiation source (42) being located in the cabin body (100) in a moving state; and a driving device releasably connected at the bottom of the first longitudinal part (1) and at the bottom of the second longitudinal part (2), the driving device being connected to the first longitudinal part (1) and the second longitudinal part (2) in an operating state, and the driving device being separated from the first longitudinal part (1) and the second longitudinal part (2) in a moving state. 2. A radiation scanning inspection device according to claim 1, characterized in that the height of the transverse part (3) in the operating state is greater than the height in the moving state, and the radiation scanning inspection device further comprises: a lifting device (62) disposed on the base part and configured to raise and lower the cross part (3) when the operating state and the moving state are switched between each other; and a support body (61) separable from the base part, wherein in the operating state the support body (61) is disposed between the cross part (3) and the base part and the base part supports the cross part (3) by the support body (61) and in the moving state the support body (61) is separated from the base part and the cross part (3) is directly supported on an upper end of the base part. 3. A radiation scanning inspection device according to claim 2, characterized in that a guide rail slidably connected to the support body (61) is arranged on the transverse portion (3); when the operating state is switched to a moving state, the support body (61) is configured to slide into the area between the first longitudinal portion (1) and the second longitudinal portion (2) via the guide rail; and when the moving state is switched to an operating state, the support body (61) slides between the base portion and the transverse portion (3) via the guide rail. 4. A radiation scanning inspection device according to claim 2, characterized in that a guiding device is arranged between the transverse part (3) and the base part, and the guiding device is configured to guide the raising and lowering of the transverse part (3). 5. A radiation scanning inspection device according to claim 2, characterized in that the support body (61) comprises a first support (611) arranged between the transverse part (3) and the first longitudinal part (1) and a second support (612) arranged between the transverse part (3) and the second longitudinal part (2); and the lifting device (62) comprises a first lifting part (621) arranged on the first longitudinal part (1) and a second lifting part (622) arranged on the second longitudinal part (2). 6. A radiation scanning inspection device according to claim 1, characterized in that it further comprises a stabilizing beam (66), wherein in a moving state the stabilizing beam (66) is connected to the first longitudinal part (1) and the second longitudinal part (2); and in an operating state the stabilizing beam (66) is separated from the first longitudinal part (1) and the second longitudinal part (2). 7. A radiation scanning inspection device according to claim 1, characterized in that the driving device comprises a plurality of wheel assemblies; in an operational state, the plurality of wheel assemblies are disposed at the bottom of the first longitudinal portion (1) and at the bottom of the second longitudinal portion (2), respectively; the radiation scanning inspection device further comprises a device for correcting the deviation; and the device for correcting the deviation is configured such that the driving device maintains linear movement in the operational state. 8. The radiation scanning inspection apparatus of claim 7, wherein each of the wheel assemblies comprises a travel wheel and a drive motor for driving the travel wheel for movement; the deviation correcting device includes a linear displacement detecting device for detecting whether the driving device maintains linear motion in an operational state, and a control device; the control device is signally connected to each drive motor and the displacement detecting device; and the control device is configured such that: in the operational state, when the linear displacement detecting device detects that the travel path of the driving device deviates from a straight line, the rotational speed of each drive motor is adjusted and controlled according to the detection result of the linear displacement detecting device to cause the driving device to continue linear motion. 9. The radiation scanning inspection apparatus of claim 7, wherein each of the wheel assemblies comprises a travel wheel; the deviation correction device comprises a linear displacement detection device, a control device, and at least one biasing device arranged in correspondence with the at least one travel wheel; the biasing device is configured to change the travel direction of the corresponding wheel; the linear displacement detection device is configured to detect whether the travel device maintains linear motion in an operational state; the control device is signally coupled to the biasing device and the linear motion detection device; and the control device is configured such that: in an operational state, when the linear motion detection device detects that the travel path of the travel device deviates from a straight line, the biasing device is controlled to deflect the corresponding travel wheel in accordance with the detection result of the linear motion detection device so as to enable the travel device to continue linear motion. 10. A radiation scanning inspection device according to claim 8 or 9, characterized in that the linear displacement detection device comprises a laser sensor in signal communication with the control device and a laser guide line arranged along a predetermined linear direction of movement of the displacement device. 11. A radiation scanning inspection device according to claim 7, characterized in that the deviation correcting device comprises a guide wheel (310) connected to the first longitudinal portion (1) or the second longitudinal portion (2); and a linear guide rail (311) configured to cooperate with the guide wheel (310) and arranged along a linear direction of travel of the travel device. 12. A radiation scanning inspection device according to claim 11, characterized in that: the wheel assembly comprises a rubber wheel that rides on a ground in the operating state; or the wheel assembly comprises a steel wheel that rides on a guide rail in the operating state. 13. A radiation scanning inspection device according to claim 12, characterized in that the guide rail on which the steel wheel moves is a linear guide rail (311). 14. A radiation scanning inspection device according to any one of claims 1 to 9, characterized in that: the transverse part (3) is rigidly connected to the first longitudinal part (1) and the second longitudinal part (2); the driving device comprises a first wheel assembly (11), a second wheel assembly (12), a third wheel assembly (13) and a fourth wheel assembly (14); each of the wheel assemblies comprises a wheel seat and a driving wheel rotatably mounted in the wheel seat; in an operating state, the wheel seat of the first wheel assembly (11) and the wheel seat of the second wheel assembly (12) are fixedly mounted at the front and rear ends of the first longitudinal portion (1), respectively, and the wheel seat of the third wheel assembly (13) and the wheel seat of the fourth wheel assembly (14) are hingedly connected to the front and rear ends of the second longitudinal portion (2), respectively; the radiation scanning inspection device further comprises a leveling beam (15); and the front and rear ends of the leveling beam (15) are hingedly connected to the wheel seat of the third wheel assembly (13) and the wheel seat of the fourth wheel assembly (14), respectively. 15. A radiation scanning inspection device according to claim 14, characterized in that the wheel seat of the third wheel unit (13) and the wheel seat of the fourth wheel unit (14) are hingedly connected to the second longitudinal part (2) by means of a pivot connection, and the axes of the hinge connection are located along a parallel direction and parallel to each other; and the wheel seat of the third wheel unit (13) and the wheel seat of the fourth wheel unit (14) are hingedly connected to the leveling beam (15) by means of a ball hinge connection. 16. A radiation scanning inspection device according to claim 14, characterized in that the wheel seat of the third wheel assembly (13) and the wheel seat of the fourth wheel assembly (14) are hingedly connected to the second longitudinal part (2) and are hingedly connected to the leveling beam (15) by means of a pivot connection, and the axes of the hinge connection are located along the horizontal direction and parallel to each other. 17. A radiation scanning inspection device according to claim 14, characterized in that the line passing through and perpendicular to the axis of the hinge connection of the leveling beam (15) and the wheel seat of the third wheel unit (13) and passing through and perpendicular to the axis of the hinge connection of the leveling beam (15) and the wheel seat of the fourth wheel unit (14) is parallel to the line passing through and perpendicular to the axis of the hinge connection of the wheel seat of the third wheel unit (13) and the second longitudinal part (2) and passing through and perpendicular to the axis of the hinge connection of the wheel seat of the fourth wheel unit (14) and the second longitudinal part (2). 18. A radiation scanning inspection device according to claim 17, characterized in that the distance between the axis of the hinge connection of the leveling beam (15) and the wheel seat of the third wheel unit (13) and the axis of the hinge connection of the leveling beam (15) and the wheel seat of the fourth wheel unit (14) is equal to the distance between the axis of the hinge connection of the wheel seat of the third wheel unit (13) and the second longitudinal part (2) and the axis of the hinge connection of the wheel seat of the fourth wheel unit (14) and the second longitudinal part (2). 19. A radiation scanning inspection device according to claim 14, characterized in that it further comprises a spring device arranged between at least two of the driving device, the leveling beam (15) and the second longitudinal portion (2), and the spring device is arranged to provide a spring force to prevent the wheel seat of the third wheel assembly (13) and the wheel seat of the fourth wheel assembly (14) from rocking relative to the second longitudinal portion (2). 20. A radiation scanning inspection device according to claim 19, characterized in that the elastic device comprises at least one of a first elastic device (51), a second elastic device (52) and a third elastic device (53); the first elastic device (51) being arranged between the wheel seat of the third wheel assembly (13) and the second longitudinal portion (2); a second elastic device (52) is arranged between the wheel seat of the fourth wheel assembly (14) and the second longitudinal portion (2); and a third elastic device (53) is arranged between the leveling beam (15) and the second longitudinal portion (2).