Patent Number: 
Section: claims

1. A shield cover for a radiation source machine, wherein, comprising:a frame body provided with a receiving chamber for receiving the radiation source machine, an end opening and an ray exit through which rays are emitted out from the radiation source machine;an end cover disposed at the end opening of the frame body and provided with a sealed chamber communicating with the receiving chamber; anda connecting member disposed between the end cover and the frame body and provided with an opening for communicating the sealed chamber of the end cover with the receiving chamber of the frame body, and the end cover being movably connected to the frame body by the connecting member such that a distance of the end cover from the end opening of the frame body is adjustable. 2. The shield cover for a radiation source machine of claim 1, wherein, the connecting member comprises a first connecting member and a second connecting member, a side of the first connecting member is fixedly connected to the end cover and the other side of the first connecting member is movably connected to the frame body, and a side of the second connecting member is fixedly connected to the end cover and the other side of the second connecting member is movably connected to the frame body, wherein the first connecting member and the second connecting member are arranged to mate with each other to form the opening. 3. The shield cover for a radiation source machine of claim 2, wherein,the first connecting member and the frame body are respectively provided with a first hole and a second hole corresponding with each other, wherein at least one of the first hole and the second hole is formed into a strip-shaped hole, and a first connector is disposed within the first hole and the second hole to movably connect the first connecting member to the frame body, andthe second connecting member and the frame body are respectively provided with a third hole and a fourth hole corresponding with each other, wherein at least one of the third hole and the fourth hole is formed into a strip-shaped hole, and a second connector is disposed within the third hole and the fourth hole to movably connect the second connecting member to the frame body. 4. The shield cover for a radiation source machine of claim 1, wherein, the connecting member is provided with an enclosing member surrounding the opening and extending into the receiving chamber, and an outer wall surface of the enclosing member and an inner wall surface of the receiving chamber are kept overlapping with each other with a gap remained therebetween. 5. The shield cover for a radiation source machine of claim 4, wherein, the frame body, the end cover, and the enclosing member are provided with anti-radiation plates on their respective wall surfaces. 6. The shield cover for a radiation source machine of claim 5, wherein, the anti-radiation plates are provided on respective inner wall surfaces of the frame body, the end cover and the enclosing member, and two adjacent ends of two adjacent anti-radiation plates are in an overlapping connection with each other. 7. The shield cover for a radiation source machine of claim 6, wherein, one of the two adjacent ends is formed with a stepped portion, and the other of the two adjacent ends is formed to mate with the stepped portion such that the two adjacent ends are in the overlapping connection with each other. 8. The shield cover for a radiation source machine of claim 1, wherein, the frame body is formed into a separated structure and includes a top cover and a bottom cover in connection with each other. 9. The shield cover for a radiation source machine of claim 1, wherein, the end cover is provided with an auxiliary positioning member, an end of which is formed to extend into the sealed chamber so as to be capable of abutting the radiation source machine and limiting a horizontal play of the radiation source machine. 10. The shield cover for a radiation source machine of claim 9, wherein, the auxiliary positioning member is formed as a rod threadedly connected to the end cover. 11. A security inspection apparatus, wherein, comprising:a shield cover for a radiation source machine, comprising:a frame body provided with a receiving chamber for receiving the radiation source machine, an end opening and an ray exit through which rays are emitted out from the radiation source machine;an end cover disposed at the end opening of the frame body and provided with a sealed chamber communicating with the receiving chamber; anda connecting member disposed between the end cover and the frame body and provided with an opening for communicating the sealed chamber of the end cover with the receiving chamber of the frame body, and the end cover being movably connected to the frame body by the connecting member such that a distance of the end cover from the end opening of the frame body is adjustable,the radiation source machine disposed in the receiving chamber; anda U-shaped arm provided on an outside of the frame body and connected to the radiation source machine to make the radiation source machine in a suspended state in the receiving chamber. 12. The security inspection apparatus of claim 11, wherein, the U-shaped arm is engaged with the frame body with the frame body received in an U-shaped opening of the U-shaped arm, and the frame body is provided with a fixing seat at a position corresponding to the U-shaped arm, through which the U-shaped arm is connected to the frame body, wherein an adjusting pad is provided between a bottom of the U-shaped arm and the fixing seat. 13. The security inspection apparatus of claim 11, wherein, the connecting member comprises a first connecting member and a second connecting member, a side of the first connecting member is fixedly connected to the end cover and the other side of the first connecting member is movably connected to the frame body, and a side of the second connecting member is fixedly connected to the end cover and the other side of the second connecting member is movably connected to the frame body, wherein the first connecting member and the second connecting member are arranged to mate with each other to form the opening. 14. The security inspection apparatus of claim 13, wherein,the first connecting member and the frame body are respectively provided with a first hole and a second hole corresponding with each other, wherein at least one of the first hole and the second hole is formed into a strip-shaped hole, and a first connector is disposed within the first hole and the second hole to movably connect the first connecting member to the frame body, andthe second connecting member and the frame body are respectively provided with a third hole and a fourth hole corresponding with each other, wherein at least one of the third hole and the fourth hole is formed into a strip-shaped hole, and a second connector is disposed within the third hole and the fourth hole to movably connect the second connecting member to the frame body. 15. The security inspection apparatus of claim 11, wherein, the connecting member is provided with an enclosing member surrounding the opening and extending into the receiving chamber, and an outer wall surface of the enclosing member and an inner wall surface of the receiving chamber are kept overlapping with each other with a gap remained therebetween. 16. The security inspection apparatus of claim 15, wherein, the frame body, the end cover, and the enclosing member are provided with anti-radiation plates on their respective wall surfaces. 17. The security inspection apparatus of claim 16, wherein, the anti-radiation plates are provided on respective inner wall surfaces of the frame body, the end cover and the enclosing member, and two adjacent ends of two adjacent anti-radiation plates are in an overlapping connection with each other. 18. The security inspection apparatus of claim 17, wherein, one of the two adjacent ends is formed with a stepped portion, and the other of the two adjacent ends is formed to mate with the stepped portion such that the two adjacent ends are in the overlapping connection with each other. 19. A method of radiating an object, comprising:placing an object within a radiation source machine; the radiation source machine have a shield cover comprising:a frame body provided with a receiving chamber for receiving the radiation source machine, an end opening and an ray exit through which rays are emitted out from the radiation source machine;an end cover disposed at the end opening of the frame body and provided with a sealed chamber communicating with the receiving chamber; anda connecting member disposed between the end cover and the frame body and provided with an opening for communicating the sealed chamber of the end cover with the receiving chamber of the frame body, and the end cover being movably connected to the frame body by the connecting member such that a distance of the end cover from the end opening of the frame body is adjustable, andirradiating the object. 20. The method of claim 19, further comprising receiving radiation that passed through the object.