CN-121197695-B - Beam distribution system capable of randomly setting stations in three-dimensional space

CN121197695BCN 121197695 BCN121197695 BCN 121197695BCN-121197695-B

Abstract

The invention discloses a beam distribution system capable of randomly setting stations in a three-dimensional space, which comprises a mounting cylinder, a combined rotating beam line, a bracket structure, a laser tracker rotating station system, a pin wheel unit, a pulley unit and a laser tracker unit, wherein the mounting cylinder is arranged on a plurality of treatment rooms radially distributed in the circumferential direction, the combined rotating beam line is arranged in the mounting cylinder and can rotate around a rotating axis vertical to the ground, the bracket structure is annularly arranged on the designated height of the inner wall of the mounting cylinder, the laser tracker rotating station system comprises the pin wheel unit is arranged on the bracket structure, the pulley unit is connected with the pin wheel unit in a transmission manner and can do circumferential motion around the combined rotating beam line, the lifting unit is arranged on the pulley unit and can do vertical lifting motion along the height direction of the combined rotating beam line, and the laser tracker unit is arranged on the lifting unit and can do circumferential motion along the combined rotating beam line along the lifting unit, so that the laser tracker unit can randomly set stations in the three-dimensional space in the mounting cylinder.

Inventors

ZHENG YAJUN
CHEN WENJUN
YANG YAQING
PAN YONGXIANG
YANG JIANCHENG
ZHANG LU
LU HAIJIAO
RUAN SHUANG
WANG YIHAN
Lang Yongbin
XU XIAOWEI

Assignees

先进能源科学与技术广东省实验室
中国科学院近代物理研究所

Dates

Publication Date: 20260508
Application Date: 20251021

Claims (7)

1. A beam distribution system capable of arbitrary three-dimensional space station setting, comprising: the mounting cylinder is arranged on a plurality of treatment rooms radially distributed in the circumferential direction; A combined rotating harness arranged in the mounting cylinder and rotatable around a rotation axis perpendicular to the ground for distributing the beam into each of the treatment rooms; The bracket structure is annularly arranged on the designated height of the inner wall of the mounting cylinder; a laser tracker docking system comprising: the pin wheel unit is arranged on the bracket structure; The pulley unit is connected to the pin wheel unit in a transmission way and can do circumferential movement around the combined rotary wire harness; The lifting unit is arranged on the pulley unit and can vertically lift along the height direction of the combined rotary harness; The laser tracker unit is arranged on the lifting unit, can perform circumferential movement around the combined rotary beam line along with the pulley unit and can perform vertical lifting movement along the height direction of the combined rotary beam line along with the lifting unit, so that the laser tracker unit can be randomly arranged in a three-dimensional space in the mounting cylinder; at least two pulley units are connected together by a pulley connecting plate to move together, each pulley unit comprises a moving component connecting plate, a C-shaped inner arc guide piece, a C-shaped outer arc guide piece, radial rollers, vertical rollers, a servo motor, a movement control unit, zhou Baixian gears, a gear shaft, a synchronous belt, a supporting plate and a transmission base; The two C-shaped inner arc guide pieces and one C-shaped outer arc guide piece are arranged at the lower part of the moving assembly connecting plate in a triangular shape and are fixedly connected with the moving assembly connecting plate through connecting bolts; The Zhou Baixian gear is connected with the gear shaft, the Zhou Baixian gear is meshed with each pin shaft, one end of the gear shaft is connected with the supporting plate bearing, the other end of the gear shaft is connected with the motion control unit bearing, and the supporting plate is connected with the motion assembly connecting plate through bolts; The servo motor is arranged on the motion assembly connecting plate through the transmission base and is in transmission connection with the gear shaft through the synchronous belt; The lifting unit comprises a guide rail, a sliding block, a lead screw and a stepping motor; The guide rail is vertically and fixedly connected to the pulley unit connecting plate through a guide rail supporting body and a lifting unit fixing piece, the sliding block is slidably connected to the guide rail, the laser tracker unit is fixedly connected with the sliding block through a laser tracker unit supporting body, the stepping motor is mounted on the top of the guide rail supporting body, and the stepping motor is in transmission connection with the sliding block through the lead screw.
2. The beam distribution system of claim 1 wherein the laser tracker unit comprises a laser tracker, a connection shaft, a mounting base, a support ball, a positioning base, and an electric rotating table; The laser tracker is sleeved at the upper end of the connecting shaft, the mounting base is in running fit between the lower end of the connecting shaft and the upper end of the support, and the three can be mechanically locked through a locking handle on the mounting base; the upper end of the support ball head is a cylinder, the lower end of the support ball head is a ball head, and the lower end of the support is in running fit with the upper end of the support ball head and is fixed by a positioning screw; The positioning base is of a cylindrical structure, the support and the support ball head are both positioned in the positioning base, the ball head of the support ball head is matched with the ball socket spherical surface at the bottom of the positioning base to form a centering structure, and the support ball head can be mechanically locked through the locking component at the bottom of the positioning base; The positioning base is installed on the electric rotating table, and the electric rotating table is used for driving the positioning base to realize 360-degree rotation.
3. The beam distribution system according to claim 2, wherein a certain gap is reserved between the support and the positioning base, and a plurality of groups of leveling components are uniformly arranged on the positioning base in the circumferential direction, and the leveling components are used for swinging and leveling the laser tracker around the center of the spherical surface so as to realize the leveling function of the laser tracker.
4. The beam distribution system of claim 2 wherein the pin wheel unit comprises: The upper clamping plate and the lower clamping plate are fixed on the bracket structure at intervals in parallel; The pin shafts are arranged between the upper clamping plate and the lower clamping plate.
5. The beam distribution system according to claim 4, wherein the upper clamping plate and the lower clamping plate each comprise a plurality of first sectional clamping plates and a plurality of second sectional clamping plates, both ends of the first sectional clamping plates and the second sectional clamping plates are respectively provided with matched step surfaces, the upper clamping plates and the lower clamping plates are in seamless lap joint to form a ring shape, the upper clamping plates and the lower clamping plates which are in adjacent lap joint are in threaded connection through clamping plate fasteners, and are fastened through nuts, and the clamping plate fasteners simultaneously connect the upper clamping plates and the lower clamping plates together.
6. The beam distribution system of claim 4 wherein a plurality of said radial rollers are bolted to said C-shaped inner arc guide and C-shaped outer arc guide and said radial rollers are in rolling contact with the inner and outer arc surfaces of said upper clamp plate for radial guiding restraint; The vertical rollers are connected with the C-shaped inner arc guide piece and the C-shaped outer arc guide piece through flanges, and are in rolling contact with the upper plane and the lower plane of the upper clamping plate, so that the vertical guide constraint function is achieved.
7. The beam distribution system of claim 1 wherein the laser tracker unit covers the lowest and highest points of the combined rotating beamline with the lifting stroke of the slider.

Description

Beam distribution system capable of randomly setting stations in three-dimensional space Technical Field The invention belongs to the technical field of collimation measurement of radiotherapy particle accelerators, and particularly relates to a beam distribution system capable of being randomly arranged in a three-dimensional space. Background Radiotherapy is one of the important means in the field of global tumor treatment, and has wide application in tumor treatment. Heavy ion irradiation, because of its unique physical and biological properties, presents significant advantages in the field of radiotherapy. The proportion of ionization of the inner shell layer of the water molecule caused by the heavy ion irradiation is significantly higher than other rays such as electrons, X rays and protons, so that the biological effect is significantly better than other radiotherapy. In addition, the heavy ion beam has inverted depth dose distribution, can accurately irradiate the tumor part, has small damage to normal tissues and low side effect, and is therefore known as the most advanced international radiation for tumor radiotherapy. However, in the case of using a heavy ion beam for treating cancer, if only one irradiation direction is used, normal cells between the skin and the tumor are subjected to at least 1/3 of the tumor radiation dose, thereby causing various degrees of damage. To reduce this damage and increase the focal ratio of the treatment, a treatment session typically requires irradiation from different directions, dividing the total dose into multiple irradiation directions, which can greatly reduce the dose to normal tissue. Currently, ion beam irradiation terminals are mainly of two types, namely a fixed beam treatment terminal, and commonly comprise a horizontal terminal, a 45-degree terminal, a vertical terminal, a horizontal+vertical terminal or a horizontal+45-degree terminal and the like. In order to realize treatment rooms with different irradiation angles, the length of the beam line is often required to be extended to be long, so that the number of terminal treatment rooms is small (usually 3-5), the beam distribution efficiency is low, the number of annual treatment cases is limited, and further the treatment cost and the later operation cost are high, and the popularization difficulty is high. The other is a rotary frame (gantry) technology which is widely applied in the field of proton treatment and belongs to a single-room multi-angle treatment scheme. However, the heavy ion rotating frame has a huge scale, and the processing and running costs are extremely high, so that the heavy ion rotating frame has less application in the heavy ion treatment field. In order to achieve multi-angle irradiation and increase the number of treatment rooms while avoiding an increase in the length of the harness, researchers have proposed a vertical combined rotating harness scheme that radially distributes a plurality of treatment rooms in the circumferential direction of harness rotation and can simultaneously provide a plurality of irradiation angles (at least three or more) in one treatment room, thereby greatly reducing the equipment cost and the occupied area, and being a radiation treatment technology with revolutionary. Positioning before irradiation and waiting for dose decay after irradiation are the longest links in radiation therapy. Increasing the number of treatment rooms is critical to improving treatment efficiency, while combining rotating harnesses can double the number of treatment rooms without increasing the length of the harness. When a patient in a certain treatment room receives treatment, the rest treatment rooms can be used for simultaneously positioning the patient, so that the positioning waiting time is effectively shortened, the treatment efficiency is remarkably improved, and the input-output ratio of the heavy ion treatment device is greatly improved. The combined rotary harness is usually formed by combining two or more harnesses at a certain angle, the most common combined form is three combined harnesses with the angle of +45° +90° horizontally, the harnesses are usually overlapped with each other in the vertical direction, the harness pipelines are highly dense, the mechanical structure is complex, and then the combined rotary harness is installed on a frame and placed in a cylinder to rotate around the axis vertical to the ground. The more irradiation angles the combined rotating harness can provide in one treatment room, the higher its vertical height is correspondingly, and the harness is mounted between the trusses of the support. This structure makes it difficult for conventional laser trackers or optical measurement devices to penetrate the occluded area, resulting in dead zones in the collimated measurement of critical nodes (e.g., diode magnets, quadrupole magnets, beam diagnostic elements, vacuum lines, etc.). The alignment measurement installation of the c