CN214209190U

CN214209190U - Radiotherapy device and radiotherapy equipment

Info

Publication number: CN214209190U
Application number: CN202022218803.8U
Authority: CN
Inventors: 郭召
Original assignee: Beijing Dayitonghui Innovation Technology Co ltd; Our United Corp
Current assignee: Dayi Innovation Factory Beijing Technology Co ltd; Our United Corp
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-09-17
Anticipated expiration: 2030-09-30

Abstract

The utility model discloses a radiotherapy device and radiotherapy equipment belongs to medical instrument technical field. The radiotherapy apparatus comprises: the support plate comprises a first support, a second support, a support plate and a driving assembly. This drive assembly is located the backup pad, when needs maintain this drive assembly, can directly dismantle this drive assembly from the backup pad, need not to dismantle the second support that is used for installing the second level collimator, and the effectual degree of difficulty when having simplified when maintaining drive assembly has just improved the maintenance efficiency when maintaining this drive assembly.

Description

Radiotherapy device and radiotherapy equipment

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a radiotherapy device and radiotherapy equipment.

Background

Radiotherapy is an important means for treating cancer, and radiotherapy equipment (radiotherapy equipment for short) is a key medical equipment for carrying out radiotherapy. Among them, the radiotherapy apparatus (also called a treatment head) is an important component of radiotherapy equipment.

In the related art, the radiotherapy apparatus may generally include: a first stage collimator and a second stage collimator (which may typically be multi-leaf collimators), and a drive assembly therebetween. The driving component is used for driving the second-stage collimator to rotate around the axial lead of the first-stage collimator, so that the radiotherapy device forms different radiation fields.

However, since the driving assembly is located between the first-stage collimator and the second-stage collimator, when the driving assembly needs to be repaired, the second-stage collimator needs to be detached from the radiotherapy device, and then the driving assembly is detached and then repaired, so that the difficulty and efficiency of repairing the driving assembly are high at present.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a radiotherapy device and radiotherapy equipment. The degree of difficulty when can solving prior art and maintaining drive assembly is higher, and the lower problem of efficiency, technical scheme is as follows:

in one aspect, there is provided a radiotherapy apparatus comprising:

the first support is used for mounting a first-stage collimator;

the second support is used for mounting a second-stage collimator;

the supporting plate is positioned between the first support and the second support;

and the driving assembly is positioned on the supporting plate and used for driving the second support to rotate relative to the first support.

Optionally, the radiotherapy apparatus further comprises: and the slewing bearing is positioned between the first support and the support plate, and under the driving of the driving assembly, the slewing bearing drives the support plate and the second support to rotate relative to the first support.

Optionally, the slewing bearing comprises: the outer gear ring is fixedly connected with the first support, and the inner ring body is fixedly connected with the support plate;

the drive assembly includes: driving motor and with the drive gear that driving motor connects, wherein, driving motor with backup pad fixed connection, drive gear with outer ring gear meshing under driving motor's drive, drive gear follows outer ring gear rotates, in order to drive the backup pad with the second support for first support gyration.

Optionally, the driving assembly further includes: the mount pad is located drive gear with between the driving motor, with the backup pad is kept away from one side fixed connection of first support, and with driving motor fixed connection, the axial lead of mount pad with the axial lead of drive gear does not coincide.

Optionally, the second support has a service opening for the second stage collimator to be installed into or removed from the second support.

Optionally, the second stage collimator comprises a multi-leaf collimator, and when the leaves of the multi-leaf collimator are located inside the second mount, at least a portion of the leaf drive structure of the multi-leaf collimator is located outside the service opening.

Optionally, the support plate is slidably connected to the second support.

Optionally, the driving assembly further includes: and the driving angle detector is used for detecting a rotating angle when the driving assembly drives the driving gear to rotate.

Optionally, the radiotherapy apparatus further comprises: and the position detection assembly is positioned on the supporting plate and used for detecting the rotating angle of the second support when the driving assembly drives the second support to rotate relative to the first support.

In another aspect, there is provided a radiotherapy apparatus comprising: the radiation therapy device comprises a rotating rack and any one of the radiation therapy devices, wherein the first support is fixedly connected with the rotating rack.

The embodiment of the utility model provides a beneficial effect that technical scheme brought includes at least:

the radiotherapy apparatus comprises: the support plate comprises a first support, a second support, a support plate and a driving assembly. This drive assembly is located the backup pad, when needs maintain this drive assembly, can directly dismantle this drive assembly from the backup pad, need not to dismantle the second support that is used for installing the second level collimator, and the effectual degree of difficulty when having simplified when maintaining drive assembly has just improved the maintenance efficiency when maintaining this drive assembly.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a radiotherapy device according to an embodiment of the present invention;

fig. 2 is a schematic structural view of another radiation therapy device provided by the embodiment of the present invention;

FIG. 3 is a cross-sectional view of the radiation therapy device shown in FIG. 2;

FIG. 4 is an enlarged partial view of the radiation therapy device shown in FIG. 2;

FIG. 5 is an effect of the radiation therapy device shown in FIG. 2 in one position;

FIG. 6 is an effect of the radiation therapy device shown in FIG. 2 in another position;

FIG. 7 is a schematic view of the shape of the radiation field created by the radiation therapy device shown in FIG. 5;

FIG. 8 is a schematic view of the shape of the radiation field formed by the radiation therapy device shown in FIG. 6;

fig. 9 is a schematic structural diagram of a driving assembly according to an embodiment of the present invention;

fig. 10 is a schematic diagram illustrating a positional relationship between a mounting seat and a transmission shaft in a driving assembly according to an embodiment of the present invention;

fig. 11 is an effect diagram of a positional relationship between the driving gear and the gear ring before adjustment according to an embodiment of the present invention;

fig. 12 is an effect diagram of the adjusted position relationship between the driving gear and the gear ring according to the embodiment of the present invention;

fig. 13 is a schematic structural diagram of a radiotherapy apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a radiotherapy device according to an embodiment of the present invention. The radiotherapy device 000 may include:

a first support 100, a second support 200, a support plate 300, and a drive assembly 400.

The first support 100 is used for mounting a first stage collimator 100a (not labeled in fig. 1); the second mount 200 is used to mount a second stage collimator 200 a.

The support plate 300 may be located between the first support 100 and the second support 200.

The driving assembly 400 may be located on the support plate 300. The driving assembly 400 is used for driving the second support 200 to rotate relatively to the first support 100.

It should be noted that when the driving assembly 400 drives the second support 200 to rotate relative to the first support 100, the second stage collimator 200a in the second support 200 can be located at different positions, so that the radiotherapy device 000 can form different radiation fields.

In the embodiment of the present invention, the driving assembly 400 is located on the supporting plate 300, and when the driving assembly 400 needs to be repaired, the second support 200 for installing the second stage collimator 200a does not need to be detached from the radiotherapy device 000, and the driving assembly 400 can be directly detached from the supporting plate 300. Thus, the difficulty in maintaining the driving assembly 400 is effectively simplified, and the maintenance efficiency in maintaining the driving assembly 400 is improved.

To sum up, the embodiment of the present invention provides a radiotherapy device, including: the support plate comprises a first support, a second support, a support plate and a driving assembly. This drive assembly is located the backup pad, when needs maintain this drive assembly, can directly dismantle this drive assembly from the backup pad, need not to dismantle the second support that is used for installing the second level collimator, and the effectual degree of difficulty when having simplified when maintaining drive assembly has just improved the maintenance efficiency when maintaining this drive assembly.

In the embodiment of the present invention, please refer to fig. 2 and 3, fig. 2 is a schematic structural diagram of another radiotherapy device provided in the embodiment of the present invention, and fig. 3 is a cross-sectional view of the radiotherapy device shown in fig. 2. The radiotherapy device 000 may further comprise: a radiation source 500. The radiation source 500 may be fixedly coupled to a side of the first holder 100 remote from the support plate 300. Illustratively, the radiation source 500 may be an acceleration tube for accelerating electrons and targeting the output high energy beam.

The first stage collimator 100a mounted on the first support 100 is located below the radiation source 500 to confine the high energy beam within a certain range to form a radiation beam in a cone shape. Illustratively, the first-stage collimator 100a has a conical collimating hole 101, so that the high-energy beam emitted from the radiation source 500 can form a radiation beam with a conical shape after passing through the first-stage collimator 100a having the conical collimating hole 101.

A support plate 300 is positioned below the first support 100, the support plate 300 has a radiation hole 301, and the radiation hole 301 may communicate with the conical hole 101 in the first-stage collimator 100 a.

The second stage collimator 200a mounted on the second support 200 is located below the support plate 300 and is used for conforming the radiation beam in a cone shape to obtain a radiation field substantially conforming to the shape of the tumor in the patient plane for irradiating the tumor. Illustratively, the second-stage collimator 200a has a plurality of leaves (not labeled), and the position of each leaf can be adjusted so that the second-stage collimator 200a conforms the radiation beam in a cone shape, thereby obtaining a field substantially conforming to the shape of the tumor at the patient plane.

Alternatively, in the radiation therapy device 000, the first support 100 is rotatably coupled to the support plate 300, and the second support 200 is slidably coupled to the support plate 300.

In an embodiment of the present invention, as shown in fig. 3, the radiotherapy device 000 may further include: a slew bearing 600. The slewing bearing 600 may be located between the first support 100 and the support plate 300. Wherein, under the driving of the driving assembly 400, the rotary bearing 600 can drive the supporting plate 300 and the second support 200 to rotate relatively to the first support 100.

For example, as shown in fig. 2 and 3, the slewing bearing 600 may include: an inner ring body 601 and an outer ring gear 602 rotatably connected to the inner ring body 601. The inner ring body 601 and the outer ring gear 602 can rotate relatively. For example, the slewing bearing 600 may further include: the plurality of balls 603 between the inner race body 601 and the outer ring gear 602 can realize relative rotation between the inner race body 601 and the outer ring gear 602 by rotation of the plurality of balls 603 between the inner race body 601 and the outer ring gear 602.

In the embodiment of the present invention, the inner ring 601 of the slewing bearing 600 may be fixedly connected to the supporting plate 300, for example, the inner ring 601 may be fixedly connected to the supporting plate 300 by screws.

The outer ring gear 602 of the slewing bearing 600 may be fixedly connected to the first mount 100, for example, the outer ring gear 602 may be fixedly connected to the first mount 100 by screws.

In this case, as shown in fig. 2, 3 and 4, fig. 4 is a partially enlarged view of the radiotherapy apparatus shown in fig. 2. The driving assembly 400 in the radiotherapy device 000 may include: a driving motor 401 and a driving gear 402 connected to the driving motor 401. The driving motor 401 is fixedly connected to the support plate, and the driving gear 402 is engaged with the outer ring gear 602 in the slewing bearing 600. In this way, under the driving of the driving motor 401, the driving gear 402 of the driving motor 401 can rotate and rotate along the external gear ring 602, so as to drive the supporting plate 300 and the second support 200 to rotate relative to the first support 100. Thus, the radiotherapy device can form different radiation fields.

For example, referring to fig. 5 and 6, fig. 5 is a graph showing the effect of the radiotherapy device shown in fig. 2 in one position, and fig. 6 is a graph showing the effect of the radiotherapy device shown in fig. 2 in another position. When the position of the second-stage collimator 200a in the radiotherapy device 000 is as shown in fig. 5, after the driving assembly 400 in the radiotherapy device 000 drives the second support 200 to rotate around the direction a to drive the second-stage collimator 200a on the second support 200 to rotate around the direction a, the position of the second-stage collimator 200a in the radiotherapy device 000 can be referred to fig. 6. In this case, as shown in fig. 7 and 8, fig. 7 is a schematic view of the shape of the field formed by the radiotherapy apparatus shown in fig. 5, and fig. 8 is a schematic view of the shape of the field formed by the radiotherapy apparatus shown in fig. 6. If the driving assembly 400 of the radiotherapy device 000 drives the second-stage collimator 200a to rotate around the direction a, so that the position of the second-stage collimator 200a of the radiotherapy device 000 is switched from the position shown in fig. 5 to the position shown in fig. 6, the field formed by the radiotherapy device 000 can also be changed from the shape of the field shown in fig. 7 to the shape of the field shown in fig. 8.

Optionally, as shown in fig. 2 and 3, the driving assembly 400 may further include: a mounting seat 403. The mount 403 is located between the drive gear 402 and the drive motor 401 in the drive assembly 400. The mounting seat 403 may be fixedly connected to a side of the supporting plate 300 away from the first support 100, and the mounting seat 403 may be fixedly connected to the driving motor 401 in the driving assembly 400. The axis of the mount 403 is not coincident with the axis of the drive gear 402 in the drive assembly 400.

Exemplarily, as shown in fig. 9, fig. 9 is a schematic structural diagram of a driving assembly according to an embodiment of the present invention. In the driving assembly 400, the mounting seat 403 may be sleeved on the driving motor 401 to support the driving motor 401. The driving motor 401 has a transmission shaft 401a, a portion of the transmission shaft 401a may be located outside the mounting seat 403, and the driving gear 402 in the driving assembly 400 may be sleeved on the portion of the transmission shaft 401a located outside the mounting seat 403 and may be fixedly connected to the transmission shaft 401 a. In this way, the driving motor 401 can drive the driving gear 402 to rotate through the transmission shaft 401 a. Referring to fig. 10, fig. 10 is a schematic diagram illustrating a position relationship between a mounting seat and a transmission shaft in a driving assembly according to an embodiment of the present invention, a shaft axis L1 of the mounting seat 403 does not coincide with a shaft axis L2 of the transmission shaft 401a, so that a shaft axis (i.e., a shaft axis L2) of a driving gear 402 located on the transmission shaft 401a does not coincide with a shaft axis L1 of the mounting seat 403. For example, the distance between the axis L1 of the mount 403 and the axis L2 of the transmission shaft 401a may be e.

It should be noted that the driving gear 402 and the mounting seat 403 in the driving assembly 400 are respectively located at two different sides of the supporting plate 300, for example, the driving gear 402 is located at a side of the supporting plate 300 close to the first seat 100, and the mounting seat 403 is located at a side of the supporting plate 300 away from the first seat 100.

In this case, when the driving assembly 400 needs to be mounted on the supporting plate 300, the position of the transmission shaft 401a can be adjusted by rotating the mounting seat 403, so that the driving gear 402 and the outer gear ring 602 can be smoothly meshed with each other, and the meshing gap between the driving gear 402 and the outer gear ring 602 can be adjusted by rotating the mounting seat 403, so that the meshing precision between the driving gear 402 and the outer gear ring 602 is effectively improved, and the driving precision in the subsequent driving is further improved. After the adjustment of the meshing accuracy between the driving gear 402 and the outer ring gear 602 is completed by rotating the mount 403, the mount 403 may be fixed on the side of the support plate 300 away from the first-stage collimator 100.

For example, referring to fig. 11 and 12, fig. 11 is an effect diagram of a positional relationship between a driving gear and a gear ring before adjustment according to an embodiment of the present invention, and fig. 12 is an effect diagram of a positional relationship between a driving gear and a gear ring after adjustment according to an embodiment of the present invention. Since the axial line L1 of the mounting seat 403 is not coincident with the axial line L2 of the transmission shaft 401a of the driving motor 401, when the mounting seat 403 is rotated, the transmission shaft 401a can rotate around the axial line L1 of the mounting seat 403, and further can drive the driving gear 402 to rotate around the axial line L1 of the mounting seat 403, so that the driving gear 402 and the outer gear ring 602 can be smoothly meshed, and the meshing gap between the two can be adjusted.

In the embodiment of the present invention, as shown in fig. 9 and 10, the mounting seat 403 in the driving assembly 400 may include: a base body 403a, a connecting plate 403b fixedly connected to the base body 403a, and a plurality of fasteners (not shown). The connecting plate 403b has a positioning protrusion 403b1 and a plurality of kidney-shaped holes 403b2 corresponding to the fasteners. The support plate 300 has a positioning hole (not labeled) to be fitted with the positioning protrusion 403b1, and a plurality of fastening holes (labeled) corresponding to the plurality of kidney holes 403b2 one to one. Wherein, the first end of each fastener has a fastening piece for abutting against the connecting plate 403b, and the second end of each fastener can pass through the corresponding waist-shaped hole 403b2 and then be connected with the corresponding fastening hole.

For example, the positioning protrusion 403b1 on the connection plate 403b may be a cylindrical protrusion with a through hole, through which the transmission shaft 401a of the driving motor 401 needs to pass to be exposed outside the mounting seat 403. The positioning hole of the support plate 300 may be a cylindrical through hole, and the positioning hole matches with the shape of the positioning protrusion 403b 1. After the positioning protrusions 403b1 are installed in the positioning holes, the mounting seat 403 can be rotated on the support plate 300.

When it is required to mount the driving assembly 400 on the support plate 300, first, the driving motor 401 may be assembled in the base body 403a in the support base 403 with a portion of the transmission shaft 401a in the driving motor 401 exposed outside the support base 403; thereafter, the transmission shaft 401a may be passed through the positioning hole in the support plate 300, and the positioning projection 403b1 on the connection plate 403b may be fitted in the positioning hole on the support plate 300; then, the drive gear 402 is mounted on the transmission shaft 401a, and the mount 403 is rotated to mesh the drive gear 402 with the outer ring gear 602 and adjust the meshing gap therebetween; finally, the second end of each fastener is connected to the corresponding fastening hole after passing through the corresponding kidney-shaped hole 403b2, and the connecting plate 403b can be fixed to the supporting plate 300 by the fastening piece on the first end of the fastener. In this manner, the mounting of the driving assembly 300 on the support plate 300 is achieved.

It should be noted that, in the embodiment of the present invention, both the driving gear 402 and the external gear ring 602 may be external gears, the fastening member may be a screw, and the fastening hole may be a threaded hole engaged with the screw.

Optionally, the driving assembly 400 may further include: the angle detector (not shown) is driven. The driving angle detector is used for detecting the rotating angle of the driving gear 402 when the driving assembly 400 drives the driving gear 402 in the driving assembly 400 to rotate. The driving motor 400 can monitor the rotation angle of the second cradle 200 through the driving angle detector. For example, the drive angle detector may be a motor encoder.

In an embodiment of the present invention, as shown in fig. 2, the radiotherapy device 000 may further include: the position detection assembly 700. The position detecting assembly 700 is located on the support plate 100, and the position detecting assembly 700 is used for detecting the rotation angle of the support plate 300 when the driving assembly 400 drives the support plate 300 to rotate relative to the first support 100. The driving accuracy of the driving assembly 400 can be compensated by the position detecting assembly 700.

For example, assuming that the driving assembly 400 can monitor the 90-degree rotation of the second cradle 200 by the driving angle detector when the second cradle 200 needs to rotate 90 degrees, the second cradle 200 does not necessarily rotate 90 degrees due to a possible step loss or a rotation jam occurring during the operation of the driving motor 401. In this case, if the position detecting assembly 700 detects that the second support 200 actually rotates by 89 degrees, the position detecting assembly 700 feeds back the actual rotation angle of the second support 200 to the driving assembly 400, so that the driving assembly 400 can drive the second support 200 to rotate until the second support 200 rotates to a desired angle.

In the embodiment of the present invention, as shown in fig. 2, the position detecting assembly 700 may include: a measuring scale 701, a reading head 702 and a connecting piece 703. Wherein, the detection ruler 701 is positioned on the outer gear ring 602, and a plurality of scale marks can be evenly distributed on the detection ruler 701. One end of the connector 703 may be fixedly connected to the reading head 702, and the other end may be fixedly connected to the supporting plate 300. The readhead 702 may be a sensor for identifying the scale marks on the measuring tape 701. When the driving assembly 400 drives the supporting plate 300 to rotate, the reading head 702 can rotate around the detection ruler 701, so that the rotating angle of the supporting plate 300 can be determined by identifying the number of the scale marks on the detection ruler 701, and the rotating angle of the second support 200 can be determined.

It should be noted that the number of the reading heads 702 in the position detecting assembly 700 can be two, and the rotation angle of the second support 200 can be determined more accurately by the two reading heads 702. And the problem that the rotating angle of the second support 200 cannot be accurately determined after the single reading head 702 fails can be avoided.

Alternatively, as shown in fig. 2, the second mount 200 has a service opening 200 b. The access opening in the second mount 200 is used for the second stage collimator 200a to be loaded into the second mount 200 or to be removed from the second mount 200. In this way, the process of mounting and dismounting the second stage collimator 200a in the second mount 200 is effectively simplified. In the process of maintaining the second-stage collimator 200a, the second support 200 does not need to be detached from the support plate 300, and the second-stage collimator 200a is detached only through the maintenance opening 200b, so that the efficiency of maintaining the second-stage collimator 200a is effectively improved.

In an embodiment of the present invention, the second stage collimator 200a may include a multi-leaf collimator. The multileaf grating may include: a plurality of blades 201 and a plurality of blade driving structures (not labeled in the figure) corresponding to the plurality of blades one to one. Each blade driving structure is used for driving the corresponding blade 201 to move along the extending direction thereof. When the plurality of leaves 201 in the multileaf grating are located inside the second mount 200, at least a part of the leaf driving structure in the multileaf grating is located outside the detection opening 200b in the second mount 200. In this way, when the multi-blade grating is repaired, the blade driving structure can be directly detached from the blade 201 without detaching the blade 201 from the second mount 200. Further improving the efficiency of servicing the secondary collimator 200 a.

It should be noted that, the plurality of blades 201 in the multi-blade grating may be divided into two groups of blades, and the two groups of blades can be driven by respective blade driving structures to form field areas of different shapes. After the high-energy rays emitted from the radiation source 500 in the radiotherapy device 000 sequentially pass through a field area formed by two groups of blades in the primary collimator and the secondary collimator, a field with the same shape as the field area can be formed.

Alternatively, as shown in fig. 2, the second support 200 may be slidably coupled to the support plate 300. The sliding of the second support 200 on the support plate 300 can move the blade 201 in the second support 200. Therefore, the blade 201 can move under the driving of the blade driving structure and can also slide on the supporting plate 300 along with the second support 200, and the field changing efficiency of the multi-blade grating is effectively improved.

In an embodiment of the present invention, the radiotherapy device 000 may further comprise: a slide rail assembly 800 located between the second support 200 and the support plate 300, through which the second support 200 can be slidably connected with the support plate 300. For example, as shown in fig. 3, the slide rail assembly 800 may include: a slide rail 801 fixedly connected with the support plate 300, and a slider 802 slidably connected with the slide rail 801. The slider 802 may be fixedly coupled to the second support 200. The extension direction of the slide rail 801 needs to be parallel to the moving direction of the blade 201.

Optionally, as shown in fig. 2, the radiation head 000 may further include: and a drag chain 900 positioned on the support plate 300, wherein a cable for connecting the second-stage collimator 200a is arranged in the drag chain 900, and the cable can also be connected with a control part in the radiotherapy equipment to realize the electrical connection between the control part and the second-stage collimator 200 a. The drag chain 900 can prevent the cable from being entangled during the rotation of the support plate 300 and the second stage collimator 200 a.

The embodiment of the utility model provides a still provide a radiotherapy equipment's schematic structure diagram. Referring to fig. 13, fig. 13 is a schematic structural diagram of a radiotherapy apparatus according to an embodiment of the present invention. The radiotherapy apparatus may comprise: a radiation therapy device 000 and a rotating gantry 001. The radiotherapy device 000 may be the radiotherapy device shown in fig. 1 or fig. 3 in the above-described embodiments. The radiation therapy device 000 may be fixedly connected to the rotating gantry 001, for example, the radiation therapy device 000 may be fixedly connected to the rotating gantry 001 through a connection plate 002. The rotating gantry 001 is capable of rotating to move the radiation therapy device 000 to different positions.

In the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is only an alternative embodiment of the present invention, and is not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.

Claims

1. A radiation therapy device, comprising:

the first support is used for mounting a first-stage collimator;

the second support is used for mounting a second-stage collimator;

2. Radiotherapy installation according to claim 1,

the radiotherapy apparatus further comprises: and the slewing bearing is positioned between the first support and the support plate, and under the driving of the driving assembly, the slewing bearing drives the support plate and the second support to rotate relative to the first support.

3. Radiotherapy installation according to claim 2,

the slewing bearing includes: the outer gear ring is fixedly connected with the first support, and the inner ring body is fixedly connected with the support plate;

4. Radiotherapy installation according to claim 3,

the drive assembly further includes: the mount pad is located drive gear with between the driving motor, with the backup pad is kept away from one side fixed connection of first support, and with driving motor fixed connection, the axial lead of mount pad with the axial lead of drive gear does not coincide.

5. Radiotherapy installation according to one of claims 1 to 4,

the second support has a service opening for the second stage collimator to be loaded into or removed from the second support.

6. Radiotherapy installation according to claim 5,

the second stage collimator includes a multi-leaf grating having at least a portion of its leaf drive structure located outside the service opening when the plurality of leaves are located inside the second mount.

7. Radiotherapy installation according to one of claims 1 to 4,

the support plate is connected with the second support in a sliding mode.

8. Radiotherapy installation according to claim 3,

the drive assembly further includes: and the driving angle detector is used for detecting a rotating angle when the driving assembly drives the driving gear to rotate.

9. Radiotherapy installation according to claim 8,

the radiotherapy apparatus further comprises: and the position detection assembly is positioned on the supporting plate and used for detecting the rotating angle of the second support when the driving assembly drives the second support to rotate relative to the first support.

10. A radiotherapy apparatus, characterized by comprising: a rotating gantry, and a radiation therapy device according to any one of claims 1 to 9, wherein the first support is fixedly connected to the rotating gantry.