Patent Number: 
Section: claims

1. A collimator for X-ray imaging apparatus, said collimator comprising:a collimator housing including a tube flange;a tube;a locating ring configured to be mounted at an outlet of the tube flange; andat least one tongue set fixed on the locating ring, wherein an outstretching direction of the tongue is towards a center of the locating ring. 2. The collimator according to claim 1, wherein the at least one tongue set further comprises:a tongue set housing including a tongue outlet on a first end face thereof;a tongue in the tongue set housing and including a head configured to move out from the tongue and a tail having a pullback section; anda trigger pin configured to control the movement of the tongue head. 3. The collimator according to claim 2, further comprising a block plate connected to a second end face of the tongue set housing opposite to the first end face, the block plate configured to cover the pullback section of the tongue tail. 4. The collimator according to claim 1, further comprising at least three tongue sets uniformly disposed about the locating ring. 5. The collimator according to claim 2, further comprising at least three tongue sets uniformly disposed about the locating ring. 6. The collimator according to claim 3, further comprising at least three tongue sets uniformly disposed about the locating ring. 7. The collimator according to claim 1, further comprising a rotating lock knob on the locating ring, the rotating lock knob configured to control a rotation of the collimator. 8. The collimator according to claim 2, further comprising a rotating lock knob on the locating ring, the rotating lock knob configured to control a rotation of the collimator. 9. The collimator according to claim 3, further comprising a rotating lock knob on the locating ring, the rotating lock knob configured to control a rotation of the collimator. 10. A method for assembling and disassembling the collimator for X-ray imaging apparatus according to claim 1, the method comprising:an assembling method comprising:rotating an operation platform system to an assembling position to place the tube and the tube flange in position;placing the collimator in the assembling position;pressing a trigger pin; andmounting a block plate; anda disassembling method comprising:rotating the operation platform system to a disassembling position;removing the block plate;pulling back the tongue; andmoving the collimator away from the operation platform system. 11. An X-ray imaging apparatus comprising the collimator according to claim 1. 12. A method for assembling and disassembling a collimator for an X-ray imaging apparatus, the collimator including a collimator housing including a tube flange, a tube, a locating ring configured to be mounted at an outlet of the tube flange, and at least one tongue set fixed on the locating ring, wherein an outstretching direction of the tongue is towards a center of the locating ring, said method comprising:rotating an operation platform system to an assembling position to place the tube and the tube flange in position;placing the collimator in the assembling position;pressing a trigger pin; andmounting a block plate. 13. The method according to claim 12, further comprising:rotating the operation platform system to a disassembling position;removing the block plate;pulling back the tongue; andmoving the collimator away from the operation platform system. 14. An X-ray imaging apparatus comprising a collimator comprising:a collimator housing including a tube flange;a tube;a locating ring configured to be mounted at an outlet of the tube flange; andat least one tongue set fixed on the locating ring, wherein an outstretching direction of the tongue is towards a center of the locating ring. 15. The X-ray imaging apparatus according to claim 14, wherein the at least one tongue set comprises:a tongue set housing including a tongue outlet on a first end face thereof;a tongue in the tongue set housing and including a head configured to move out from the tongue and a tail having a pullback section; anda trigger pin configured to control the movement of the tongue head. 16. The X-ray imaging apparatus according to claim 15, wherein the at least one tongue set further comprises further comprising a block plate connected to a second end face of the tongue set housing opposite to the first end face, the block plate configured to cover the pullback section of the tongue tail. 17. The X-ray imaging apparatus according to claim 16, wherein the at tongue comprises a locating hole and a slotted hole connected to the locating hole, wherein the locating hole is wider than the slotted hole. 18. The X-ray imaging apparatus according to claim 17, wherein the head of the tongue is wider than a remainder of the tongue such that the tail of the tongue passes through an opening on the block plate. 19. The X-ray imaging apparatus according to claim 14, wherein the collimator comprises at least three tongue sets uniformly disposed about the locating ring. 20. The X-ray imaging apparatus according to claim 14, wherein the locating ring comprises rotating lock knob configured to control a rotation of the collimator.