Patent Number: 
Section: claims

1. A multi-leaf collimator, comprising:a first carriage, a second carriage, a drive device, a first set of leaves disposed on the first carriage, and a second set of leaves disposed on the second carriage, whereinthe first set of leaves and the second set of leaves are disposed oppositely to each other, and each leaf in each of the sets of leaves is movable relative to each respective carriage; andthe drive device is configured to drive the first carriage and the second carriage to move in the same direction synchronously, whereinthe first carriage is provided with a carriage end, a load-bearing end, and a first light-transmitting hole between the carriage end and the load-bearing end; whereinthe carriage end is configured to mount the first set of leaves;the second carriage is disposed at the load-bearing end; andthe drive device is connected to the first carriage and configured to drive the first carriage to move, such that the first carriage drives the second carriage to move in the same direction synchronously. 2. The multi-leaf collimator according to claim 1, further comprising a base; whereinthe first carriage is disposed on the base, and the base is provided with a second light-transmitting hole; andan orthographic projection of the first light-transmitting hole on the base covers an area where the second light-transmitting hole is disposed. 3. The multi-leaf collimator according to claim 1, further comprising a drive motor disposed on the second carriage; whereinthe drive motor is configured to drive the second carriage to move. 4. A multi-leaf collimator, comprising:a first carriage, a second carriage, a drive device, a first set of leaves disposed on the first carriage, and a second set of leaves disposed on the second carriage, whereinthe first set of leaves and the second set of leaves are disposed oppositely to each other, and each leaf in each of the sets of leaves is movable relative to each respective carriage; andthe drive device is configured to drive the first carriage and the second carriage to move in the same direction synchronously,wherein the first carriage and the second carriage are disposed oppositely to each other, and the multi-leaf collimator further comprises a first differential and a second differential; whereinthe first differential is connected to the first carriage, and the second differential is connected to the second carriage; andthe drive device is connected to the first differential and the second differential respectively, and configured to drive the first differential and the second differential such that the first carriage and the second carriage move in the same direction synchronously, whereinthe multi-leaf collimator further comprises a main drive shaft, and a first transmission gear and a second transmission gear that are engaged with each other; whereinthe drive device is connected to the first transmission gear, and the second transmission gear is sleeved on the main drive shaft; andone end of the main drive shaft is connected to the first differential, and the other end of the main drive shaft is connected to the second differential. 5. The multi-leaf collimator according to claim 4, wherein the multi-leaf collimator meets at least one of the following conditions:both the first differential and the second differential are planetary differentials; andboth the first transmission gear and the second transmission gear are bevel gears. 6. The multi-leaf collimator according to claim 4, further comprising: a field control motor, and a third differential connected to the field control motor; whereinthe third differential is connected to the first differential and the second differential respectively, and configured to drive the first differential and the second differential under the drive of the field control motor, such that the first carriage and the second carriage move toward or distally from each other. 7. The multi-leaf collimator according to claim 6, further comprising: a third transmission gear and a fourth transmission gear; whereina transmission shaft of the third differential is connected to the field control motor;a first output shaft of the third differential is connected to the third transmission gear, and the third transmission gear is engaged with a main transmission gear in the first differential; anda second output shaft of the third differential is connected to the fourth transmission gear, and the fourth transmission gear is engaged with a main transmission gear in the second differential. 8. A radiotherapy equipment, comprising:a radiation source; anda multi-leaf collimator, wherein the multi-leaf collimator comprises: a first carriage, a second carriage, a drive device, a first set of leaves disposed on the first carriage, and a second set of leaves disposed on the second carriage, whereinthe first set of leaves and the second set of leaves are disposed oppositely to each other, and each leaf in each of the sets of leaves is movable relative to each respective carriage; andthe drive device is configured to drive the first carriage and the second carriage to move in the same direction synchronously, whereinthe first carriage is provided with a carriage end, a load-bearing end, and a first light-transmitting hole between the carriage end and the load-bearing end; whereinthe carriage end is configured to mount the first set of leaves;the second carriage is disposed at the load-bearing end; andthe drive device is connected to the first carriage and configured to drive the first carriage to move, such that the first carriage drives the second carriage to move in the same direction synchronously. 9. The radiotherapy equipment according to claim 8, wherein the multi-leaf collimator further comprises a base; whereinthe first carriage is disposed on the base, and the base is provided with a second light-transmitting hole; andan orthographic projection of the first light-transmitting hole on the base covers an area where the second light-transmitting hole is disposed. 10. The radiotherapy equipment according to claim 8, wherein the multi-leaf collimator further comprises a drive motor disposed on the second carriage; whereinthe drive motor is configured to drive the second carriage to move. 11. The multi-leaf collimator according to claim 1, further comprising motors connected to leaves in each set of leaves in a one-to-one correspondence; whereineach of the motors is configured to drive the leaf as connected to move relative to each respective carriage. 12. The radiotherapy equipment according to claim 8, wherein the multi-leaf collimator further comprises: motors connected to leaves in each set of leaves in a one-to-one correspondence; whereineach of the motors is configured to drive the leaf as connected to move relative to each respective carriage.