WO2020223866A1 - Radiating unit and radiotherapy device - Google Patents

Abstract

The present application relates to the field of radiotherapy devices. Disclosed are a radiating unit and a radiotherapy device. The radiating unit comprises: a source body and a collimator which have a common central axis and are covered from outside to inside in sequence; a first gear transmission mechanism used for driving the collimator to rotate; and a second gear transmission mechanism used for driving the source body to rotate. Because the gear transmission mechanisms implement transmission on the basis of rolling contact, and line-line friction is achieved during the transmission process, wear of the gear transmission mechanisms is significantly reduced, and thus good rotation precision is still maintained under a condition that the radiating unit is used for a long time. In addition, by respectively driving the collimator and the source body to rotate independently by the two gear transmission mechanisms, not only the service life of the gear transmission mechanisms is prolonged, but the degree of controllability of the rotation process is improved.

Description

Radiation unit and radiotherapy equipment Technical field

This application relates to the field of radiotherapy equipment, in particular to radiation units and radiotherapy equipment.

Background technique

The radiation unit, such as a rotary gamma ray radiation unit, irradiates the lesion tissue at the common focus by rotating and focusing, so as to achieve the purpose of precise treatment without damaging healthy tissue.

In the related art, the rotary gamma radiation unit includes a shielding body, a source body and a collimating body with a common central axis, and a drive shaft rotatable along the central axis, wherein the lower end of the drive shaft is fixed on the collimating body, and the upper end Connected with the motor, a sleeve is sleeved outside the drive shaft, and the lower end of the sleeve is fixed on the source body. A ratchet and pawl mechanism is installed on the drive shaft, the ratchet is fixed on the drive shaft, and the pawl is fixed on the upper end of the sleeve. In this way, the collimating body and the source body can rotate in the same direction when the motor is rotating forward, and the collimating body rotates while the source body does not move when the motor is reversed.

However, the above-mentioned ratchet and pawl mechanism implements transmission by means of surface-to-surface friction, and long-term use will cause severe wear and thereby affect the rotation accuracy of the rotary gamma radiation unit.

Summary of the invention

The embodiments of the present application provide a radiation unit and radiotherapy equipment, which can solve the above technical problems. The technical solution is as follows:

In one aspect, a radiation unit is provided. The radiation unit includes a source body and a collimator body that have a common central axis and are sequentially enclosed from outside to inside, wherein the radiation unit further includes: The first gear transmission mechanism for rotating the collimator; and

A second gear transmission mechanism for driving the source body to rotate.

In a possible implementation manner, the first gear transmission mechanism includes: a collimating body transmission shaft with a front end fixedly connected to the collimating body;

A first driven gear fixedly connected to the rear end of the collimator drive shaft;

A first driving gear that meshes with the first driven gear;

A first driving mechanism for driving the first driving gear to rotate.

In a possible implementation manner, the first driven gear is fixedly connected to the rear end of the collimator drive shaft through an expansion sleeve.

In a possible implementation manner, the second gear transmission mechanism includes: a source body transmission sleeve sleeved outside the collimating body transmission shaft and fixedly connected with the source body at the front end;

A second driven gear fixedly connected to the rear end of the source body transmission sleeve;

A second driving gear that meshes with the second driven gear;

A second driving mechanism for driving the second driving gear to rotate.

In a possible implementation manner, the second driven gear is fixedly connected to the rear end of the source body transmission sleeve through an expansion sleeve.

In a possible implementation manner, a first bearing is provided between the collimating body transmission shaft and the source body transmission sleeve.

In a possible implementation manner, the radiation unit further includes: a shield, and a fixing sleeve located between the source transmission sleeve and the shield;

The front end of the fixed sleeve is rotatably connected with the source body transmission sleeve, and the rear end of the fixed sleeve is fixedly connected with the shielding body.

In a possible implementation manner, there is a second bearing between the source body transmission sleeve and the fixed sleeve.

In a possible implementation manner, the radiation unit further includes a shield, and a first bracket and a second bracket fixed on the shield;

The first bracket is used to support the first gear transmission mechanism;

The second bracket is used to support the second gear transmission mechanism.

In a possible implementation manner, the radiation unit further includes a shield;

There is a first rolling support mechanism between the source body and the shielding body; and/or,

A second rolling support mechanism is provided between the source body and the collimating body.

In a possible implementation manner, the first rolling support mechanism and/or the second rolling support mechanism are bearings or cam bearing followers.

In a possible implementation manner, the cam bearing follower includes: a wedge-shaped compression block fixed in a mounting groove on the inner wall of the shield;

A wedge-shaped moving block located in the installation groove, and the wedge surface of the wedge-shaped moving block contacts and fits with the wedge surface of the wedge-shaped compression block;

A wheel shaft rotatably connected with the wedge-shaped moving block, and the wheel shaft is in rolling contact with the wall of the source body.

In a possible implementation manner, the cam bearing followers are arranged in a plurality of intervals along the circumferential direction of the shielding body.

In a possible implementation manner, the radiation unit further includes: an anti-collision protective cover fixedly sleeved inside the collimator;

An anti-collision detection element that is axially movably located on the collimating body transmission shaft, and the anti-collision detection element is used to detect a collision event and send a collision signal.

In a possible implementation manner, the anti-collision detection component includes: a push rod axially movably located inside the collimating body transmission shaft, and a front end of the push rod and a rear end of the anti-collision protective cover Fixed connection; and

The collision detectors are spaced a set distance opposite to the rear end of the push rod.

In a possible implementation manner, the collision detector is a micro switch.

In a possible implementation manner, there is an elastic reset member between the push rod and the collimator transmission shaft, and after a touch event occurs, the elastic reset member is used to reset the anti-collision protective cover.

In a possible implementation manner, a lubricating sleeve is provided on the inner wall of the collimator drive shaft.

In another aspect, a radiotherapy equipment is provided, wherein the radiotherapy equipment includes any of the above-mentioned radiation units.

The beneficial effects brought by the technical solutions provided by the embodiments of the present application include at least:

The radiation unit provided by the embodiment of the application adopts a first gear transmission mechanism to drive the collimator body to rotate, and a second gear transmission mechanism to drive the source body to rotate. The gear transmission mechanism is based on a rolling contact method for transmission. The transmission process is line-line friction. , Which can significantly reduce the wear on the gear transmission mechanism, thereby ensuring that the rotary gamma radiation unit still maintains good rotation accuracy under long-term use. In addition, the two gear transmission mechanisms drive the collimator body and the source body to rotate independently, which not only helps to increase the service life of the gear transmission mechanism, but also improves the controllability of the rotation process.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained from these drawings without creative work.

Figure 1 is a cross-sectional view of an exemplary radiation unit of the application;

Figure 2 is a side view of an exemplary radiation unit of the application;

Figure 3 is a sectional view of A-A in Figure 2;

FIG. 4 is a cross-sectional view of another exemplary radiation unit of the application.

The reference signs respectively indicate:

1-shielding body, 2-source body, 3-collimation body,

401-collimator drive shaft, 402-first driven gear, 403-first driving gear,

404-first drive mechanism, 501-source body transmission sleeve, 502-second driven gear,

503-second driving gear, 504-second driving mechanism,

6-first bearing, 7-fixed sleeve, 8-second bearing, 9-first bracket, 10-second bracket,

11-The first rolling support mechanism, 111-wedge-shaped compression block, 112-wedge-shaped moving block, 113-wheel axle,

12-second rolling support mechanism, 13-anti-collision protection cover,

14-Putter, 15-Collision detector.

Detailed ways

In order to make the technical solutions and advantages of the present application clearer, the following further describes the embodiments of the present application in detail with reference to the accompanying drawings.

The radiation unit disclosed in the embodiment of the present application includes a source body and a collimator body that have a common central axis and are sequentially covered from the outside to the inside, wherein the source body is provided with a radiation source for emitting radiation. The radiation source can be, for example, a natural isotope radiation source, such as cobalt-60, which can emit gamma rays; or an accelerator, which can emit X-rays. A collimator is arranged on the collimator, and the rays emitted by the ray source can be focused on a common focus through the collimator. The type of ray source is not limited in this application. For example, when the ray source is an accelerator, the radiation unit may include multiple accelerators, each of which emits X-rays separately, and the X-rays emitted by multiple accelerators are focused on a common focus. It may also be that the radiation unit includes at least one accelerator, and the X-ray beam emitted by the accelerator is split, so that multiple X-rays are focused on a common focus.

The following embodiments and drawings all take a radiation unit with a gamma ray source as an example for description.

On the one hand, an embodiment of the present application provides a radiation unit, as shown in FIG. 1, which includes a source body 2 and a collimator body 3 that have a common central axis and are sequentially enclosed from the outside to the inside. Further, the radiation unit further includes: a first gear transmission mechanism for driving the collimator body 3 to rotate; and a second gear transmission mechanism for driving the source body 2 to rotate.

The radiation unit provided by the embodiment of the present application uses a first gear transmission mechanism to drive the collimator body 3 to rotate, and a second gear transmission mechanism to drive the source body 2 to rotate. The gear transmission mechanism is driven based on a rolling contact method. The transmission process is linear- Line friction can significantly reduce the wear on the gear transmission mechanism, thereby ensuring that the rotary gamma radiation unit still maintains good rotation accuracy under long-term use. In addition, the two gear transmission mechanisms drive the collimator body 3 and the source body 2 to rotate independently, which not only helps to increase the service life of the gear transmission mechanism, but also improves the controllability of the rotation process.

It should be noted that the source body 2 and the collimating body 3 involved in the embodiments of the present application may be common in the art. For example, the source body 2 and the collimating body 3 may both be hollow hemispherical or similar. The hemispherical structure may also be a cylindrical or frustum-shaped structure.

For the source body 2, a plurality of ray source loading cavities and ray channels can be provided on it, wherein a gamma radiation source is loaded in the radiation source loading cavity, and the gamma rays emitted by the gamma radiation source pass through the ray channel along the radial direction. Align the common focal point on the common central axis. Alternatively, the source body 2 may only be provided with a plurality of radiation source loading cavities, and the beams emitted by the gamma radiation source are aligned with the common focus on the common central axis through the collimator.

For the collimator 3, multiple groups of collimators with the same distribution as the loading cavity of the radiation source may be provided on it, and the apertures of the ray channels of different groups of collimators may be different from each other. For example, the collimator 3 may also include several shielding plugs for shielding the beam emitted by the gamma radiation source, so as to achieve the purpose of shutting down the radiation source.

As shown in FIG. 1, for the first gear transmission mechanism, it may include: a collimating body transmission shaft 401 fixedly connected to the collimating body 3 at the front end; and a first slave fixedly connected to the rear end of the collimating body transmission shaft 401 The driving gear 402; the first driving gear 403 meshed with the first driven gear 402; the first driving mechanism 404 for driving the first driving gear 403 to rotate.

It can be understood that the front end of the collimator drive shaft 401 refers to the end close to the collimator 3, and the rear end of the collimator drive shaft 401 refers to the end far away from the collimator 3.

In application, the first driving gear 403 is driven to rotate by the first driving mechanism 404, which in turn drives the first driven gear 402 and the collimator drive shaft 401 to rotate together, because the front end of the collimator drive shaft 401 is fixed to the collimator 3 The connection can drive the collimator 3 to rotate together. Among them, the above-mentioned rotation process includes forward rotation and reverse rotation.

For example, the central axis of the collimating body transmission shaft 401 coincides with the common central axis of the radiating unit, and an installation step may be provided on the outer wall of the front end thereof. Correspondingly, the collimating body 3 is provided with an installation adapted to the installation step For the groove, a fixing member, such as a screw, a pin, etc., can be used to fix the installation step in the installation groove to realize a fixed connection between the collimator drive shaft 401 and the collimator 3.

The first driven gear 402 can be fixedly sleeved on the rear end of the collimator drive shaft 401, and the fixing methods between the two include but are not limited to: fixed connection with fixing parts, welding, etc. In order to make the two sets stable and easy to disassemble, a fixing member, such as an expansion sleeve, can be used for fixed connection.

The first driving gear 403 may be located on one side of the first driven gear 402 and mesh with it. The first driving mechanism 404 at least includes a rotating shaft which is coaxially connected with the first driving gear 403 to drive the first driving gear 403 to rotate.

In a possible example, the first driving mechanism 404 may be a driving motor. In order to obtain the desired rotation speed of the collimator 3, in the embodiment of the present application, the diameter of the first driven gear 402 is larger than the diameter of the first driving gear 403, for example, the diameter multiple may be 2-5 times.

In a possible example, the radiation unit may further include a shielding body 1, and the shielding body 1 may be enclosed outside the source body 2.

In order to stably arrange the first gear transmission mechanism in the radiation unit, as shown in FIG. 1, the radiation unit provided by the embodiment of the present application further includes: a first bracket 9 fixed on the shielding body 1, wherein the A bracket 9 is used to support the first gear transmission mechanism.

For example, the first bracket 9 may be fixedly connected to the rear end of the shielding body 1 and, at the same time, also fixedly connected to the housing of the first driving mechanism 404. The first bracket 9 can be arranged in a folded plate shape, and the direction of the folding is so as to be able to connect with the shielding body 1 and the first driving mechanism 404 at the same time, and to minimize its volume.

As shown in FIG. 1, the second gear transmission mechanism may include: a source body transmission sleeve 501 sleeved outside the collimator transmission shaft 401 and fixedly connected to the source body 2 at the front end; and the source body transmission sleeve 501 A second driven gear 502 fixedly connected to the rear end of the second driven gear 502; a second driving gear 503 meshed with the second driven gear 502; a second driving mechanism 504 for driving the second driving gear 503 to rotate.

It can be understood that the front end of the source transmission sleeve 501 refers to the end close to the source 2, and the rear end of the source transmission sleeve 501 refers to the end far away from the source 2.

In application, the second driving gear 503 is driven to rotate by the second driving mechanism 504, which in turn drives the second driven gear 502 and the source body transmission sleeve 501 to rotate together. Since the front end of the source body transmission sleeve 501 is fixedly connected to the source body 2, The source body 2 can be driven to rotate together. Among them, the above-mentioned rotation process includes forward rotation and reverse rotation.

For example, the central axis of the source body transmission sleeve 501 coincides with the common central axis of the radiating unit, and an installation step may also be provided on the outer wall of the front end thereof. Correspondingly, the source body 2 is provided with an installation groove adapted to the installation step , The installation step can be fixed in the installation groove by a fixing member, such as a screw, a pin, etc., to realize a fixed connection between the source body transmission sleeve 501 and the source body 2.

The second driven gear 502 can be fixedly sleeved on the rear end of the source transmission sleeve 501, and the fixing methods between the two include, but are not limited to: fixed connection, welding, etc., using a fixing member. In order to make the two sets stable and easy to disassemble, a fixing member, such as an expansion sleeve, can be used for fixed connection.

The second driving gear 503 may be located at one side of the second driven gear 502 and mesh with it. The second driving mechanism 504 at least includes a rotating shaft which is coaxially connected with the second driving gear 503 to drive the second driving gear 503 to rotate.

In a possible example, the second driving mechanism 504 may be a driving motor. In order to obtain the desired rotation speed of the source body 2, in the embodiment of the present application, the diameter of the second driven gear 502 is larger than the diameter of the second driving gear 503, for example, the diameter multiple may be 2-5 times.

In order to enable the second gear transmission mechanism to be stably arranged in the radiation unit, as shown in FIG. 1, the radiation unit provided in the embodiment of the present application further includes a shielding body 1 and a second bracket 10 fixed on the shielding body 1. , Wherein, the second bracket 10 is used to support the second gear transmission mechanism.

For example, the second bracket 10 may be fixedly connected to the rear end of the shielding body 1 and, at the same time, also fixedly connected to the housing of the second driving mechanism 504. The second bracket 10 can be arranged in a folded plate shape, and the direction of the folding is so as to be able to connect with the shielding body 1 and the second driving mechanism 504 at the same time, and it is suitable to minimize its volume.

In the embodiment of the application, in order to prevent interference between the two gear transmission mechanisms, the positions of the first gear transmission mechanism and the second gear transmission mechanism may be staggered. For example, the first gear transmission mechanism may be located behind the second gear transmission mechanism. That is, the second driven gear 502 is closer to the shield 1 than the first driven gear 402 is. In addition, the second driving gear 503 and the first driving gear 403 are respectively located on different sides.

Further, in order to reduce the relative friction between the collimating body transmission shaft 401 and the source body transmission sleeve 501, improve the service life of both, and make the rotation process of the two more stable, the collimator body transmission shaft 401 and the source body transmission There may be a first bearing 6 between the sleeves 501.

For example, a first inner annular groove may be provided on the inner wall of the source transmission sleeve 501, for example, near the rear end thereof, and the first inner annular groove cooperates with the outer wall of the collimator transmission shaft 401 to form a fitting and receiving The bearing cavity of the first bearing 6 facilitates the installation of the first bearing 6. Alternatively, a first outer annular groove may be provided at a corresponding position on the outer wall of the collimating body transmission shaft 401, and the first outer annular groove cooperates with the first inner annular groove to form a bearing cavity adapted to accommodate the first bearing 6.

In order to facilitate the disassembly and assembly of the first gear transmission mechanism and the second gear transmission mechanism, the radiation unit provided in the embodiment of the present application may further include a shielding body 1, and a fixing sleeve 7 located between the source transmission sleeve 501 and the shielding body 1. Wherein, the front end of the fixed sleeve 7 is rotatably connected with the source transmission sleeve 501, and the rear end of the fixed sleeve 7 is fixedly connected with the shielding body 1.

Since the fixing sleeve 7 is located between the source transmission sleeve 501 and the shield 1, the shield 1 can be easily disassembled and assembled separately by disconnecting it from the source transmission sleeve 501.

Further, in order to reduce the wear of the source transmission sleeve 501 and at the same time make the rotation of the source transmission sleeve 501 more stable, wherein, as shown in FIG. 1, there is a second bearing 8 between the source transmission sleeve 501 and the fixed sleeve 7. .

For example, a second inner annular groove may be provided on the inner wall of the fixed sleeve 7, for example, a part near the rear end thereof, and the second inner annular groove cooperates with the outer wall of the source transmission sleeve 501 to fit and accommodate the second bearing. 8 bearing cavity to facilitate the installation of the second bearing 8. Alternatively, a second outer annular groove may be provided at a corresponding position on the outer wall of the source transmission sleeve 501, which cooperates with the second inner annular groove to form a bearing cavity adapted to accommodate the second bearing 8.

It can be seen from the above that the source body 2 and the collimator body 3 can rotate relatively independently. During the rotation of the two, in order to avoid the rotation between the source body 2 and the collimator body 3 and between the source body 2 and the shield body 1 The friction also makes the rotation process of the source body 2 and the collimator body 3 more stable. As shown in FIG. 2, in the embodiment of the present application, a first rolling support mechanism 11 is provided between the source body 2 and the shielding body 1. Furthermore, there is a second rolling support mechanism 12 between the source body 2 and the collimating body 3. The use of a rolling support mechanism, which is conducive to follow-up and has a supporting effect, not only can solve the above technical problems, but also can avoid supporting the source body 2 only through the source body transmission sleeve 501 and only through the collimating body transmission shaft 401 The source body 2 and the collimator body 3 droop caused by the collimator 3 (according to the direction defined in the embodiment of the present application, the drooping direction can be understood as the direction in which the source body 2 and the collimator body 3 move forward).

Among them, the first rolling support mechanism 11 and the second rolling support mechanism 12 can both be bearings or cam bearing followers, and the two can be the same or different. Examples are given below:

In a possible example, both the first rolling support mechanism 11 and the second rolling support mechanism 12 may be bearings. An annular bearing groove can be provided on the inner wall of the shield body 1 and the inner wall of the source body 2 for installing the above-mentioned bearing. Alternatively, the outer wall of the source body 2 and the outer wall of the collimating body 3 can be further provided with an annular bearing groove corresponding to the annular bearing groove provided on the inner wall to form a bearing cavity for mounting the bearing.

When the first rolling support mechanism 11 and the second rolling support mechanism 12 are bearings, they are both set to one.

In a possible example, as shown in FIG. 3, both the first rolling support mechanism 11 and the second rolling support mechanism 12 may be cam bearing followers.

Taking the first rolling support mechanism 11 as an example, its corresponding cam bearing follower may include: a wedge-shaped compression block 111 fixed in a mounting groove on the inner wall of the shielding body 1, wherein the thickness of the wedge-shaped compression block 111 is determined by It gradually increases from back to front (it can also be understood as increasing gradually from top to bottom along the axial direction of the shield 1). It also includes: a wedge-shaped moving block 112 located in the installation groove and adapted to the wedge-shaped pressing block 111, wherein the thickness of the wedge-shaped moving block 112 is gradually reduced from back to front, so that the wedge surface of the wedge-shaped moving block 111 and The wedge surfaces of the wedge-shaped compression block 112 contact and cooperate. It also includes a wheel shaft 113 rotatably connected with the wedge-shaped moving block 111, and the wheel shaft 113 is in rolling contact with the wall of the source body 2 to reduce friction.

In application, the axle 113 is used to reduce the friction between the source body 2 and the shield 1, and the wedge-shaped moving block 112 and the wedge-shaped pressing block 111 are used to support the source body 2. Once the source body 2 moves forward Trend, the wedge-shaped moving block 112 will also move forward, but due to the cooperation of the two wedge surfaces, the wedge-shaped moving block 112 will be resisted by the wedge-shaped pressing block 111, thereby preventing the source body 2 from continuing to move forward and achieving stable support. the goal of.

When the first rolling support mechanism 11 and the second rolling support mechanism 12 are cam bearing followers, they can both be arranged in a plurality of evenly spaced in the circumferential direction, such as 3 or 4.

During the treatment of the patient, the head of the patient may collide with the inner wall of the collimator 3. In order to avoid further injury to the patient, as shown in FIG. 4, the radiation unit provided in the embodiment of the present application also Including: an anti-collision protective cover 13 located inside the collimator 3; an anti-collision detection component that can be axially movably located on the collimator drive shaft 401, wherein the anti-collision detection component is used to detect a collision event and send a collision signal .

As an example, the anti-collision detection component includes: a push rod 14 axially movably located inside the collimator transmission shaft 401, and the front end of the push rod 14 is fixedly connected to the rear end of the anti-collision protection cover 13; and

The collision detector 15 opposed to the rear end of the push rod 14 is spaced apart by a set distance.

When the patient’s head accidentally touches the anti-collision protective cover 13, the anti-collision protective cover 13 can push the push rod 14 to move backward, the moving push rod 14 can touch the collision detector 15, and the collision detector 15 detects the occurrence of a collision event. , And send out a collision signal, so as to stop the radiotherapy equipment in time to protect the patient from harm.

For example, the collision detector 15 can be a micro switch, and it can be electrically connected to the controller of the radiotherapy device. When the micro switch sends a collision signal, it can be transmitted to the controller of the radiotherapy device in real time, and the controller sends Instructions to stop radiotherapy equipment.

The collision detector 15 may be fixed on a bracket installed on the first driven gear 402 and opposed to the rear end surface of the push rod 14 at a predetermined distance.

The collision detector 15 may be provided in plural along the circumferential direction to ensure the accuracy of collision prevention detection.

Further, a reset elastic member, such as a spring, may be provided between the push rod 14 and the collimating body transmission shaft 401. When the push rod 14 is touched by the anti-collision protection cover 13 and displaced, the anti-collision The protective cover 13 and the push rod 14 are quickly reset to the initial position.

Further, a lubricating sleeve, such as an oil-containing bushing or a self-lubricating layer, can be provided on the inner wall of the collimator transmission shaft 401 to reduce the wear of the push rod 14 with the inner wall of the collimator transmission shaft 401 when it moves in the axial direction. To reduce resistance.

On the other hand, an embodiment of the present application also provides a radiotherapy equipment, wherein the radiotherapy equipment includes any of the above-mentioned radiation units.

The radiotherapy equipment provided in the embodiments of the present application, based on the use of the above-mentioned radiation unit, can maintain good rotation accuracy even after long-term use, thereby obtaining good test accuracy.

The above descriptions are only preferred embodiments of this application and are not intended to limit this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection of this application. Within range.

Claims (19)

A radiating unit, the radiating unit comprising: a source body and a collimating body that have a common central axis and are sequentially enclosed from the outside to the inside, wherein the radiating unit further comprises: for driving the collimating body to rotate的 first gear transmission mechanism; and A second gear transmission mechanism for driving the source body to rotate. The radiation unit according to claim 1, wherein the first gear transmission mechanism comprises: a collimating body transmission shaft with a front end fixedly connected to the collimating body; A first driven gear fixedly connected to the rear end of the collimator drive shaft; A first driving gear that meshes with the first driven gear; A first driving mechanism for driving the first driving gear to rotate. 4. The radiation unit according to claim 2, wherein the first driven gear is fixedly connected to the rear end of the collimator drive shaft through an expansion sleeve. The radiation unit according to claim 2, wherein the second gear transmission mechanism comprises: a source body transmission sleeve sleeved on the outside of the collimating body transmission shaft and fixedly connected to the source body at the front end; A second driven gear fixedly connected to the rear end of the source body transmission sleeve; A second driving gear that meshes with the second driven gear; A second driving mechanism for driving the second driving gear to rotate. 5. The radiation unit according to claim 4, wherein the second driven gear is fixedly connected to the rear end of the source body transmission sleeve through an expansion sleeve. The radiation unit according to claim 4, wherein a first bearing is provided between the collimating body transmission shaft and the source body transmission sleeve. The radiation unit according to claim 4, wherein the radiation unit further comprises: a shielding body, and a fixing sleeve located between the source body transmission sleeve and the shielding body; The front end of the fixed sleeve is rotatably connected with the source body transmission sleeve, and the rear end of the fixed sleeve is fixedly connected with the shielding body. 8. The radiation unit according to claim 7, wherein a second bearing is provided between the source transmission sleeve and the fixed sleeve. The radiation unit according to claim 1, wherein the radiation unit further comprises a shield body, and a first bracket and a second bracket fixed on the shield body; The first bracket is used to support the first gear transmission mechanism; The second bracket is used to support the second gear transmission mechanism. The radiation unit according to any one of claims 1-9, wherein the radiation unit further comprises a shield; There is a first rolling support mechanism between the source body and the shielding body; and/or, A second rolling support mechanism is provided between the source body and the collimating body. The radiation unit according to claim 10, wherein the first rolling support mechanism and/or the second rolling support mechanism are bearings or cam bearing followers. The radiation unit according to claim 11, wherein the cam bearing follower comprises: a wedge-shaped compression block fixed in a mounting groove on the inner wall of the shield; A wedge-shaped moving block located in the installation groove, and the wedge surface of the wedge-shaped moving block contacts and fits with the wedge surface of the wedge-shaped compression block; A wheel shaft rotatably connected with the wedge-shaped moving block, and the wheel shaft is in rolling contact with the wall of the source body. The radiation unit according to claim 11, wherein the cam bearing follower is arranged in a plurality of intervals along the circumferential direction of the shielding body. The radiation unit according to any one of claims 2-13, wherein the radiation unit further comprises: an anti-collision protective cover fixedly sleeved inside the collimator; An anti-collision detection element that is axially movably located on the collimating body transmission shaft, and the anti-collision detection element is used to detect a collision event and send a collision signal. The radiation unit according to claim 14, wherein the anti-collision detecting member comprises: a push rod axially movably located inside the collimating body transmission shaft, and the front end of the push rod and the anti-collision protection cover Fixed back-end connection; and The collision detectors are spaced a set distance opposite to the rear end of the push rod. The radiation unit according to claim 15, wherein the collision detector is a micro switch. The radiation unit according to claim 15, wherein there is an elastic reset member between the push rod and the collimating body transmission shaft, and after a touch event occurs, the elastic reset member is used to make the anti-collision protection The hood is reset. The radiation unit according to claim 15, wherein a lubricating sleeve is provided on the inner wall of the drive shaft of the collimator. A radiotherapy equipment, wherein the radiotherapy equipment comprises the radiation unit according to any one of claims 1-18.

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