Patent Number: 
Section: claims

1. A collimator for adjusting an X-ray beam, comprising:an up-and-down adjustment mechanism;a left-and-right adjustment mechanism;a supporting member with upper and lower wall surfaces, upper and lower sliding stops, left and right wall surfaces, and left and right sliding stops; andan adjusting plate connected with the supporting member, wherein:the up-and-down adjustment mechanism comprises upper and lower first rotating nuts, upper and lower moving leading screws each threadedly connected with a respective one of the first rotating nuts, and first upper and lower limiting gland covers, wherein each of the moving leading screws is connected with a respective one of the upper and lower sliding stops to drive the upper and lower sliding stops, respectively, to vertically move, and the first upper and lower limiting gland covers are each fixed to a respective one of the upper and lower wall surfaces and confine the respective first rotating nuts to rotate within the respective first limiting gland covers; andthe left-and-right adjustment mechanism comprises left and right second rotating nuts, and left and right horizontally moving leading screws each connected with a respective one of the second rotating nuts, wherein each of the horizontally moving leading screws is connected with a respective one of the left and right sliding stops to drive the left and right sliding stops, respectively, to horizontally move. 2. The collimator for adjusting an X-ray beam according to claim 1, characterized in that:the left-and-right adjustment mechanism further comprises left and right second limiting gland covers that are each fixed to a respective one of the left and right wall surfaces of the supporting member and confine the respective second rotating nuts to rotate within the respective second limiting gland cover. 3. The collimator for adjusting an X-ray beam according to claim 1, characterized in that:each of the upper and lower moving leading screws is provided at ends thereof with opening grooves, and the opening grooves are each connected with a respective one of the upper and lower sliding stops in longitudinal sliding slots provided in the supporting member. 4. The collimator for adjusting an X-ray beam according to claim 1, characterized in that:each of the upper and lower horizontally moving leading screws is provided at ends thereof with abutting surfaces, and the abutting surfaces are each connected with a respective one of the left and right sliding stops of the left-and-right adjustment mechanism provided in the supporting member. 5. The collimator for adjusting an X-ray beam according to claim 1, characterized in that:the first rotating nuts and second rotating nuts are marked with scales and numerals. 6. The collimator for adjusting an X-ray beam according to claim 5, characterized in that:the upper and lower moving leading screws and the upper and lower horizontally moving leading screws are marked at ends thereof with scales and numerals corresponding to the first rotating nuts and the second rotating nuts. 7. The collimator for adjusting an X-ray beam according to claim 1, characterized in that:a fixed stop is provided behind the upper and lower sliding stops of the supporting member. 8. The collimator for adjusting an X-ray beam according to claim 1, characterized in that:the upper and lower sliding stops and the left and right sliding stops are made of tungsten alloy or lead alloy. 9. An adjustment device for adjusting a collimator, comprising:an up-and-down adjustment mechanism;a left-and-right adjustment mechanism; anda supporting member with upper and lower wall surfaces, upper and lower sliding stops, left and right wall surfaces, and left and right sliding stops; wherein:the up-and-down adjustment mechanism comprises upper and lower first rotating nuts, upper and lower up-and-down moving leading screws each threadedly connected with a respective one of the first rotating nuts, and upper and lower first limiting gland covers, wherein each of the moving leading screws is connected with a respective one of the upper and lower sliding stops to drive the upper and lower sliding stops, respectively, to vertically move, and the upper and lower first limiting gland covers are each fixed to a respective one of the upper and lower wall surfaces and confine the respective first rotating nuts to rotate within the first limiting gland covers; andthe left-and-right adjustment mechanism comprises left and right second rotating nuts, and left and right horizontally moving leading screws each connected with a respective one of the second rotating nuts, wherein each of the horizontally moving leading screws is connected with a respective one of the left and right sliding stops to drive the left and right sliding stops, respectively, to horizontally move. 10. The adjustment device for adjusting a collimator according to claim 9, characterized in that:the left-and-right adjustment mechanism further comprises left and right second limiting gland covers that are each fixed to a respective one of the left and right wall surfaces of the supporting member and confine the respective second rotating nuts to rotate within the respective second limiting gland cover. 11. The adjustment device for adjusting a collimator according to claim 9, characterized in that:each of the up-and-down moving leading screws is provided at ends thereof with opening grooves, and the opening grooves are each connected with a respective one of the upper and lower sliding stops provided in a longitudinal sliding slot of the supporting member. 12. The adjustment device for adjusting a collimator according to claim 9, characterized in that:each of the horizontally moving leading screws is provided at ends thereof with abutting surfaces, and the abutting surfaces are each connected with a respective one of the left and right sliding stops provided in the supporting member. 13. The adjustment device for adjusting a collimator according to claim 9, characterized in that:the first rotating nuts and second rotating nuts are marked with scales and numerals. 14. The adjustment device for adjusting a collimator according to claim 13, characterized in that:each of the up-and-down moving leading screws and each of the horizontally moving leading screws are marked at ends thereof with scales and numerals corresponding to the first rotating nuts and the second rotating nuts. 15. The adjustment device for adjusting a collimator according claim 9, characterized in that:a fixed stop is provided behind the upper and lower sliding stops of the supporting member. 16. The adjustment device for adjusting a collimator according claim 9, characterized in that:the upper and lower sliding stops and the left and right sliding stops are made of tungsten alloy or lead alloy.