Steel cable balance system for proton and heavy ion treatment device

Abstract

The invention provides a steel cable balance system for a proton and heavy ion treatment device, which comprises a mouse cage structure, a clockwise steel cable system, an anticlockwise steel cable system, a steel cable inner track and a steel cable outer track, the clockwise steel cable system and the anticlockwise steel cable system are a pair of steel cable systems which are bilaterally symmetrical; and the clockwise steel cable system and the anticlockwise steel cable system are both wound on the steel cable inner track and the steel cable outer track. According to the device, an innovative steel rope traction fixing mode is adopted, fixing force outside the rotating rack is guided into the rotating rack in the clockwise direction and the anticlockwise direction, and the mouse cage is fixed in the two directions to be prevented from rotating; therefore, a stable treading ground is obtained, and a stable mounting interface is provided for the track in the rotating floor. Compared with an existing mouse cage balance mode, the mouse cage balance device has the advantages that electric power and a control system are not needed, reliability is high, and work is stable.

Description

Technical Field

[0001] This application relates to the field of radiotherapy systems, and particularly to a cable balance system for a proton and heavy ion therapy device. Background Art

[0002] Currently, the demand for tumor and cancer treatment in China is increasing year by year. Among many treatment methods, the proton / heavy ion treatment method has more advantages compared to using X-rays or γ-rays due to its unique "Bragg peak" biological effect. This is mainly because the proton / heavy ion beam does not have a large negative effect on healthy tissues before and after reaching the designated location during the process of penetrating the human body; only when it reaches the designated location will it release energy to kill tumor cells or cancer cells. Therefore, compared to ordinary radiotherapy, proton / heavy ion treatment can greatly improve the comfort and postoperative quality of life of patients, as well as increase the cure rate and reduce side effects.

[0003] A rotating gantry designed to meet the multi-angle irradiation treatment of the diseased part, as Figure 1 shown, the treatment head 19 is fixed to the gantry cylinder 11, and the gantry cylinder 11 is supported on the gantry support structure 14 with rollers; when the gantry support structure 14 controls the rotation of the gantry cylinder 11, the treatment head 19 will rotate synchronously. Since the core position of the rotating gantry requires sufficient large-area ground support for medical staff, most rotating gantries for proton and heavy ion therapy include a rotating floor and a squirrel cage structure. As Figure 2 shown, the rotating floor includes a rotating floor chain 17, an inner rotating floor track 16, and an outer rotating floor track 15. Among them, both the inner rotating floor track 16 and the outer rotating floor track 15 need to be fixed and relatively stationary with respect to the ground; the outer rotating floor track 15 is fixed to the treatment room floor, and the inner rotating floor track 16 is fixed to the squirrel cage structure 20. Therefore, the squirrel cage structure 20 must always remain relatively stationary with respect to the ground during the rotation of the gantry cylinder 11. Due to the special nature of the rotating gantry structure, the squirrel cage structure must be installed inside the rotating gantry and rotate in the opposite direction and at the same angular velocity as the rotating gantry. Therefore, how to ensure the stable reverse rotation of the squirrel cage structure has become a key point in the design of the rotating gantry system.

[0004] Currently, the motion control of the squirrel cage structure at home and abroad mainly includes two types:

[0005] One method is, as Figure 3 shown, the balance motor 25 on the right figure drives the squirrel cage support wheel 24, which is controlled by the control system to make the squirrel cage base 21 always rotate in the opposite direction and at the same angular velocity as the rotating gantry, so as to achieve the effect that the ground of the squirrel cage base 21 is parallel to the treatment room floor.

[0006] Another method is to lower the center of the squirrel-cage structure, increase the total weight, and make the rolling friction of the squirrel cage inside the rotating frame approach zero, thereby producing an effect similar to that of a tumbler, so that no matter how the rotating frame rotates, the squirrel-cage structure always maintains the lowest position and angle inside the rotating frame, and thus the effect of parallelism between the squirrel-cage floor and the treatment room floor can also be achieved.

[0007] However, the above two balancing methods also have their drawbacks: for the balancing method of the balancing motor, the complexity of its control system is relatively high, there is a certain error rate, and mechanical misalignment is likely to occur when power is suddenly cut off; while the center-of-gravity balancing method is simple in structure and not easy to make mistakes, but the squirrel-cage floor is difficult to bear the trampling of a large weight, because the center-of-gravity eccentricity caused by personnel trampling will cause the squirrel-cage structure to lose balance.

[0008] Therefore, in order to solve the above technical problems, a new solution is provided now. Summary of the Invention

[0009] In order to solve one of the above technical defects, a cable balancing system for a proton heavy ion treatment device is provided in an embodiment of the present application, so that the squirrel-cage balancing method of the proton heavy ion rotating frame can work in a simple and low-complexity manner, and at the same time can meet the functional requirements that the squirrel-cage floor can be trampled by multiple people at any time without affecting its balancing effect.

[0010] According to the first aspect of the embodiment of the present application, a cable balancing system for a proton heavy ion treatment device is provided, and the system includes: a squirrel-cage structure, a clockwise cable system, a counterclockwise cable system, an inner cable track, and an outer cable track.

[0011] The clockwise cable system and the counterclockwise cable system are installed inside the rotating frame, and the clockwise cable system and the counterclockwise cable system are a pair of left-right symmetric cable systems.

[0012] Both the clockwise cable system and the counterclockwise cable system are wound on the inner cable track and the outer cable track.

[0013] The clockwise cable system fixes the path of the clockwise cable rope through a clockwise inner fixing structure, a clockwise inner leading-out structure, a clockwise outer leading-out structure, and a clockwise outer fixing structure. One end of the clockwise cable system fixes and pulls the squirrel-cage structure in the opposite direction inside, and the other end of the clockwise cable system fixes the clockwise cable rope on the cement floor outside.

[0014] The counterclockwise cable system fixes the path of the counterclockwise cable rope through the counterclockwise internal fixing structure, counterclockwise internal leading-out structure, counterclockwise external leading-out structure and counterclockwise external fixing structure. One end of the counterclockwise cable system fixes and pulls the cage structure in the opposite direction inside, and the other end of the counterclockwise cable system fixes the counterclockwise cable rope on the cement floor outside.

[0015] When the cage structure is driven by the rotating frame or other external forces and is about to deflect counterclockwise, its deflection motion will be aborted due to the pulling of the clockwise cable system; on the contrary, when the cage structure is driven by the rotating frame or other external forces and is about to deflect clockwise, its deflection motion will be aborted due to the pulling of the counterclockwise cable system.

[0016] Further, the cage structure includes: a cage base, a cage wall, a cage track and cage support wheels. The cage track is welded and fixed inside the barrel wall of the rotating frame and rotates together with the rotating frame; the

[0017] The cage base and the cage wall together form a circular structure, and lock themselves in a position coaxial with the rotating frame through the rolling friction of the cage support wheels.

[0018] The back of the cage wall is fixed to the cable inner track through several fixing parts and is pulled by the cable balance system in two opposite tangential directions.

[0019] Further, the clockwise cable system includes a clockwise cable internal fixing structure, a clockwise cable internal leading-out structure, a clockwise cable external leading-out structure, a clockwise cable external fixing structure, a clockwise cable rope and a cable track fixing structure.

[0020] One end of the clockwise cable rope is fixed to the cement floor by the clockwise external fixing structure, and the other end of the clockwise cable rope is fixed to the cable inner track by the clockwise internal fixing structure and has a clockwise pulling force on the cable inner track from the tangential direction. The cable inner track is fixed to the cage wall through the cable track fixing structure.

[0021] Further, the counterclockwise cable system includes a counterclockwise cable internal fixing structure, a counterclockwise cable internal leading-out structure, a counterclockwise cable external leading-out structure, a counterclockwise cable external fixing structure and a counterclockwise cable rope.

[0022] One end of the counterclockwise cable rope is fixed to the cement floor by the counterclockwise external fixing structure, and the other end of the counterclockwise cable rope is fixed to the cable inner track by the counterclockwise internal fixing structure and has a counterclockwise pulling force on the cable inner track from the tangential direction.

[0023] Further, the cable inner track is fixed behind the cage wall.

[0024] Further, the outer track of the steel cable is fixed to the tail vertebra of the rotating frame at the rear end of the rotating frame.

[0025] The beneficial technical effects of this application are as follows:

[0026] (1) The present invention adopts an innovative method of fixing by pulling with steel cables. From the clockwise and counterclockwise directions, the fixing force outside the rotating frame is guided into the rotating frame, and the squirrel cage is fixed in two directions to prevent it from rotating, thereby obtaining a stable ground for stepping and providing a stable installation interface for the inner track of the rotating floor.

[0027] (2) Compared with the existing squirrel cage balancing methods, the present invention has the advantages of not requiring electricity and a control system, high reliability, and stable operation; at the same time, it also has the advantages of a stable balance state, not being prone to tilting, and strong load-bearing capacity.

[0028] (3) Since there are no special requirements for the diameter of the rotating frame, the depth of the frame, and the size of the squirrel cage, the present invention has wide adaptability and good adaptability to the squirrel cage structures of various proton heavy ion rotating frames.

[0029] (4) The product of the present invention has less modification to the existing rotating frame and no excessive structural modification to the rotating frame. Therefore, it is also suitable for retrofitting and installing the steel cable balance system of the present invention on the existing rotating frame to make up for the deficiencies of the traditional balancing method. Description of the Drawings

[0030] The drawings described herein are used to provide a further understanding of this application, form a part of this application, and the illustrative embodiments and descriptions thereof are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0031] Figure 1 is the basic structure diagram of the proton heavy ion rotating frame;

[0032] Figure 2 is the exploded view of the rotating floor and squirrel cage structure of the proton heavy ion rotating frame;

[0033] Figure 3 is the squirrel cage structure and traditional balance mechanism of the proton heavy ion rotating frame, where (a) is the squirrel cage structure and (b) is the traditional balance mechanism;

[0034] Figure 4 is the main structure schematic diagram of the present invention formed by the clockwise steel cable and counterclockwise steel cable in combination with the inner track and outer track;

[0035] Figure 5 is Figure 4 the enlarged structure schematic diagram at A in;

[0036] Figure 6 Schematic diagram of the layer-by-layer structure of the clockwise cable system in the present invention;

[0037] Figure 7 Schematic diagram of the partial structural positions of the clockwise cable system in the present invention;

[0038] Figure 8 Schematic diagram of the layer-by-layer structure of the counterclockwise cable system in the present invention;

[0039] Figure 9 Schematic diagram of the partial structural positions of the counterclockwise cable system in the present invention;

[0040] Figure 10 Schematic diagram of the inner track structure of the cable in the clockwise cable system in the present invention;

[0041] Figure 11 is Figure 10 Enlarged schematic diagram of the structure at position B in;

[0042] Figure 12 is Figure 10 Enlarged schematic diagram of the structure at position C in;

[0043] Figure 13 Schematic diagram of the inner fixation and inner lead-out structure of the cable in the clockwise cable system in the present invention;

[0044] Figure 14 is Figure 13 Enlarged schematic diagram of the structure at position D in, where (a) is the inner fixation structure of the clockwise cable and (b) is the sectional view of the inner fixation structure of the clockwise cable;

[0045] Figure 15 is Figure 13 Enlarged schematic diagram of the structure at position E in;

[0046] Figure 16 Schematic diagram of the outer track structure of the cable and the outer fixation and outer lead-out structure of the cable in the clockwise cable system in the present invention;

[0047] Figure 17 is Figure 16 Enlarged schematic diagram of the structure at position F in;

[0048] Figure 18 is Figure 16 Enlarged schematic diagram of the structure at position G in;

[0049] Figure 19 is Figure 16 Enlarged schematic diagram of the structure at position H in;

[0050] Figure 20 is Figure 19 Enlarged schematic diagram of the structure at position J in;

[0051] Among them: 10 - proton - heavy ion rotating gantry; 20 - squirrel - cage structure; 30 - clockwise cable system; 40 - counter - clockwise cable system; 50 - inner cable track; 60 - outer cable track;

[0052] 11 - gantry cylinder; 12 - treatment room floor; 13 - gantry mounting surface; 14 - gantry support structure; 15 - outer track of rotating floor; 16 - inner track of rotating floor; 17 - rotating floor chain; 18 - gantry tail cone; 19 - treatment head;

[0053] 21 - squirrel - cage base; 22 - squirrel - cage wall; 23 - squirrel - cage track; 24 - squirrel - cage support wheel; 25 - balance motor;

[0054] 33 - inner fixed structure of clockwise cable; 34 - inner lead - out structure of clockwise cable; 35 - outer lead - out structure of clockwise cable; 36 - outer fixed structure of clockwise cable; 37 - clockwise cable rope; 38 - cable track fixed structure;

[0055] 43 - inner fixed structure of counter - clockwise cable; 44 - inner lead - out structure of counter - clockwise cable; 45 - outer lead - out structure of counter - clockwise cable; 46 - outer fixed structure of counter - clockwise cable; 47 - counter - clockwise cable rope. Detailed implementation manners

[0056] In order to make the technical solutions and advantages in the embodiments of the present application clearer and more understandable, the following further elaborates on the exemplary embodiments of the present application with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than an exhaustive list of all embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0057] The embodiments of the present application provide a cable balance system for a proton - heavy ion treatment device, including: a squirrel - cage structure 20, a clockwise cable system 30, a counter - clockwise cable system 40, an inner cable track 50, and an outer cable track 60. Its basic composition is as follows Figure 4 As shown, the clockwise cable rope 37 in the clockwise cable system 30 and the counter - clockwise cable rope 47 in the counter - clockwise cable system 40 are wound and fixed on the inner cable track 50, the outer cable track 60, and the ground; the two cable ropes are symmetrically arranged left - and - right in space and are separately wound on the inner and outer tracks without interfering with each other.

[0058] Specifically, as Figure 6 shown is a schematic diagram of the fixation of the clockwise cable system 30 cooperating with the inner cable track 50 and the outer cable track 60 in an embodiment of the present invention. The inner cable track 50 is fixed together with the squirrel - cage structure 20; the outer cable track 60 is fixed together with the gantry tail cone 18.

[0059] Specifically, as Figure 7 shown is a schematic structural diagram of the clockwise cable system in an embodiment of the present invention. The clockwise cable system includes a clockwise cable inner fixing structure 33, a clockwise cable inner leading-out structure 34, a clockwise cable outer leading-out structure 35, a clockwise cable outer fixing structure 36, a clockwise cable rope 37, and a cable track fixing structure 38. Among them, the clockwise cable inner fixing structure 33 fixes the clockwise cable rope 37 at a specific position on the inner cable track 50; the clockwise cable rope 37 is wound around the inner cable track 50 from the clockwise cable inner fixing structure 33 to the clockwise cable inner leading-out structure 34; the clockwise cable inner leading-out structure 34 adjusts the direction of the clockwise cable rope 37, leads it out from a specific position of the inner cable track 50, and leads it to the clockwise cable outer leading-out structure 35; the clockwise cable outer leading-out structure 35 adjusts the direction of the clockwise cable rope 37 and winds it around the outer cable track 60 starting from a specific position; when the clockwise cable rope 37 surrounds the outer cable track 60 by more than 180 degrees and faces the ground, it disengages from the outer cable track 60 along the tangent direction and is fixed to the cement ground by the clockwise cable outer fixing structure 36.

[0060] Specifically, as Figure 9 shown, in combination with the schematic structural diagram of the counterclockwise cable system. The counterclockwise cable system includes a counterclockwise cable inner fixing structure 43, a counterclockwise cable inner leading-out structure 44, a counterclockwise cable outer leading-out structure 45, a counterclockwise cable outer fixing structure 46, and a counterclockwise cable rope 47.

[0061] One end of the counterclockwise cable rope 47 is fixed to the cement ground by the counterclockwise outer fixing structure, and the other end of the counterclockwise cable rope 47 is fixed to the inner cable track by the counterclockwise inner fixing structure, and there is a counterclockwise pulling force on the inner cable track from the tangent direction.

[0062] Among them, the counterclockwise cable inner fixing structure 43 fixes the counterclockwise cable rope 47 at a specific position on the inner cable track 50; the counterclockwise cable rope 47 is wound around the inner cable track 50 from the counterclockwise cable inner fixing structure 43 to the counterclockwise cable inner leading-out structure 44; the counterclockwise cable inner leading-out structure 44 adjusts the direction of the counterclockwise cable rope 47, leads it out from a specific position of the inner cable track 50, and leads it to the counterclockwise cable outer leading-out structure 45; the counterclockwise cable outer leading-out structure 45 adjusts the direction of the counterclockwise cable rope 47 and winds it around the outer cable track 60 starting from a specific position; when the counterclockwise cable rope 47 surrounds the outer cable track 60 by more than 180 degrees and faces the ground, it disengages from the outer cable track 60 along the tangent direction and is fixed to the cement ground by the counterclockwise cable outer fixing structure 46.

[0063] Specifically, as Figure 10The following is a schematic diagram of the cable inner track structure of the clockwise cable system in the present invention. As Figure 11 shown, it is the fixing method of the cable inner track 50 and the squirrel cage structure 20. As Figure 12 shown, it is a schematic cross-sectional view of the clockwise cable 37 wound around the cable inner track 50.

[0064] Specifically, as Figure 13 shown, it is a schematic diagram of the inner fixing and inner leading-out structure of the clockwise cable system;

[0065] As Figure 14 shown in (b) therein, it is a sectional view of the clockwise cable inner fixing structure 33. As Figure 15 shown, it is a schematic diagram of the clockwise cable inner leading-out structure 34. The clockwise cable inner leading-out structure 34 includes a set of fixed pulleys, which can reverse the direction of the clockwise cable 37 and lead it out.

[0066] Specifically, Figure 16 it is a schematic diagram of the cable outer track structure of the clockwise cable system in the present invention and a schematic diagram of the outer fixing and outer leading-out structure of the cable;

[0067] As Figure 19 shown, it is a schematic diagram of the clockwise cable outer leading-out structure 35. As Figure 20 shown, it is a sectional view of the clockwise cable outer leading-out structure 35. As Figure 17 shown, it is a schematic cross-sectional view of the clockwise cable 37 wound around the cable outer track 60. As Figure 18 shown, it is a schematic diagram of the cable outer fixing structure. As Figure 19 shown, the clockwise cable outer leading-out structure 35 includes a set of fixed pulleys, which can reverse the direction of the clockwise cable 37 and introduce it onto the cable outer track 60.

[0068] In this application, the counterclockwise cable system 40 and the clockwise cable system 30 are mirror-symmetrical in space and are fixed on the cable inner track 50, wound around the cable inner track 50 and the cable outer track 60, and finally fixed to the cement floor in the same manner.

[0069] In this application, the specific fixing positions, winding angles, and specific leading-out positions of the two cable systems on the inner and outer tracks can be any other positions and angles except those in the embodiments.

[0070] The overall working principle of the present invention is:

[0071] The mechanical balance structure that constrains the rotation of the squirrel cage structure is composed of a clockwise steel cable system, a counterclockwise steel cable system that is mirror-symmetrical to it, an inner track of the steel cable, and an outer track of the steel cable. The clockwise steel cable system is responsible for preventing the squirrel cage structure from rotating counterclockwise; the counterclockwise steel cable system is responsible for preventing the squirrel cage structure from rotating clockwise. Specifically, one end of the clockwise steel cable rope in the clockwise steel cable system is fixed on the inner track of the steel cable, and the other end is fixed on the cement floor. Between these two fixed points, the steel cable rope is fixed in a specific route by winding and pulley guidance, and the length of the route will not increase or decrease with the rotation of the rotating frame. Therefore, when the rotating frame rotates counterclockwise, the total length of the clockwise steel cable rope will not change; the constraint of the cement floor on the clockwise steel cable rope will be transformed into a constraint on the steel cable rope for the squirrel cage structure to rotate in the counterclockwise direction. Conversely, when the rotating frame rotates clockwise, the total length of the counterclockwise steel cable will not change; the constraint of the concrete floor on the counterclockwise steel cable will be transformed into the constraint of the steel cable on the squirrel cage structure to rotate clockwise. Finally, under the joint action of the clockwise and counterclockwise steel cable systems, no matter how the rotating frame rotates, the squirrel cage structure always remains in its initial position.

[0072] The present invention utilizes the small size and easy guidance of the steel cable as well as the pulling and fixing characteristics to fix the original squirrel cage structure that cannot be fixed by internal and external hard connection and restrict rotation by the steel cable, thereby meeting the functional requirements of the squirrel cage structure.

[0073] The invention is highly innovative, occupies a small area, has low cost, is easy to install and maintain, and has wide adaptability, and is also suitable for replacing the corresponding mechanism of the already constructed rotating frame.

[0074] The present invention does not require a squirrel cage structure to be equipped with a reversing motor, does not require any communication and control equipment, reduces the complexity of the squirrel cage structure balance, and improves the overall reliability of the rotating frame.

[0075] The squirrel cage structure of the present invention is firm and reliable, and can always maintain a horizontal angle without tilting under normal load, so that the squirrel cage stepping space of the rotating frame can be made larger, bringing a more open medical space experience to patients and operators.

[0076] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0077] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0078] In the present application, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0079] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0080] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. A wire rope balancing system for a proton and heavy ion therapy device, characterized in that: The system includes: a squirrel cage structure, a clockwise steel cable system, a counterclockwise steel cable system, an inner steel cable track and an outer steel cable track. The clockwise steel cable system and the counterclockwise steel cable system are installed inside the rotating frame, and the clockwise steel cable system and the counterclockwise steel cable system are a pair of left-right symmetrical steel cable systems; The clockwise steel cable system and the counterclockwise steel cable system are both wound on the inner steel cable track and the outer steel cable track; The clockwise steel cable system fixes the path of the clockwise steel cable rope through the clockwise inner fixing structure, the clockwise inner lead-out structure, the clockwise outer lead-out structure and the clockwise outer fixing structure. One end of the clockwise steel cable system fixes and pulls the squirrel cage structure in the opposite direction inside, and the other end of the clockwise steel cable system fixes the clockwise steel cable rope on the cement floor outside. The counterclockwise steel cable system fixes the path of the counterclockwise steel cable rope through the counterclockwise internal fixing structure, the counterclockwise internal lead-out structure, the counterclockwise external lead-out structure and the counterclockwise external fixing structure. One end of the counterclockwise steel cable system fixes and pulls the squirrel cage structure in the opposite direction inside, and the other end of the counterclockwise steel cable system fixes the counterclockwise steel cable rope on the cement floor outside. When the squirrel cage structure is driven by a rotating frame or other external force to deflect counterclockwise, its deflection movement will be stopped due to the pulling of the clockwise cable system; conversely, when the squirrel cage structure is driven by a rotating frame or other external force to deflect clockwise, its deflection movement will be stopped due to the pulling of the counterclockwise cable system.

2. The wire rope balancing system for a proton and heavy ion therapy device according to claim 1, characterized in that: The cage structure comprises: a cage base, a cage wall, a cage track and a cage support wheel. The cage track is welded and fixed inside the cylinder wall of the rotating frame and rotates with the rotating frame. The cage base and the cage wall together form a circular structure, which is locked at a position coaxial with the rotating frame through rolling friction of the cage support wheel. The back of the cage wall is fixed to the inner track of the steel cable through a number of fixings and is pulled in two opposite tangential directions by the steel cable balance system.

3. The wire rope balancing system for a proton and heavy ion therapy device according to claim 1 or 2, characterized in that: The clockwise steel cable system comprises a clockwise steel cable inner fixing structure, a clockwise steel cable inner lead-out structure, a clockwise steel cable outer lead-out structure, a clockwise steel cable outer fixing structure, a clockwise steel cable rope and a steel cable track fixing structure. One end of the clockwise steel cable is fixed to the cement floor by a clockwise external fixing structure, and the other end of the clockwise steel cable is fixed to the inner track of the steel cable by a clockwise internal fixing structure, and a clockwise pulling force is applied to the inner track of the steel cable from the tangential direction, and the inner track of the steel cable is fixed to the wall of the squirrel cage through the steel cable track fixing structure.

4. The wire rope balancing system for a proton and heavy ion therapy device according to claim 3, characterized in that: The counterclockwise steel cable system comprises a counterclockwise steel cable inner fixing structure, a counterclockwise steel cable inner lead-out structure, a counterclockwise steel cable outer lead-out structure, a counterclockwise steel cable outer fixing structure and a counterclockwise steel cable rope. One end of the counterclockwise steel cable is fixed to the cement floor by a counterclockwise external fixing structure, and the other end of the counterclockwise steel cable is fixed to the inner track of the steel cable by a counterclockwise internal fixing structure, and a counterclockwise pulling force is applied to the inner track of the steel cable from the tangential direction.

5. The wire rope balancing system for a proton and heavy ion therapy device according to claim 1, characterized in that: The inner track of the steel cable is fixed behind the wall of the squirrel cage.

6. The wire rope balancing system for a proton and heavy ion therapy device according to claim 1, characterized in that: The outer track of the steel cable is fixed on the tail cone of the frame at the rear end of the rotating frame.

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