A transmission device of a radiotherapy bed, a radiotherapy bed and equipment

Abstract

The embodiment of the present application provides a transmission device of a radiotherapy bed, a radiotherapy bed and equipment, wherein the transmission device is installed on the bed frame of the radiotherapy bed, and the transmission device includes a steel belt, a first fixed support part and a second fixed support part, wherein the first fixed support part and the second fixed support part are both installed on the bed frame at both ends along the movement direction of the radiotherapy bed, and support the steel belt to move between the first fixed support part and the second fixed support part, and the bed board of the radiotherapy bed or the drag plate connected to the bed board is fixed to the steel belt and moves relative to the bed frame with the steel belt. Therefore, the embodiment of the present application uses a steel belt with rigidity as a transmission mechanism, and the steel belt is not easy to deform during long-distance transmission, has a long transmission distance, and a stable transmission process, which meets the need for long-distance movement of patients during radiotherapy.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of medical technology, and in particular to a transmission device of a radiotherapy bed, a radiotherapy bed and equipment. Background Art

[0002] The radiotherapy bed is one of the key components of large radiotherapy equipment, used to support the patient to accurately locate the cancerous part to the center of the equipment for treatment. The radiotherapy bed usually needs to move over a large range along the central axis of the radiotherapy equipment frame. Its range of movement determines the range of treatment that the patient can receive. For example, the range of movement along the central axis of the radiotherapy equipment frame needs to be large enough to receive treatment from the head and neck to the lower limbs.

[0003] Conventional radiotherapy beds use a gear rack transmission solution. The length of the rack determines the range of motion, and the increase in the length of the rack makes it difficult to process and easy to change, which brings difficulties to production and manufacturing. There is a reverse gap in the meshing of the gear rack, which affects the motion accuracy. Conventional treatment beds also use a synchronous belt transmission solution, but the synchronous belt has large deformation and short life, making it difficult to achieve high motion accuracy. The synchronous belt needs to be maintained and replaced regularly, with high maintenance costs and low safety. The transmission solution using a screw has a large deflection of the slender screw, making it difficult to achieve long-distance transportation. Summary of the invention

[0004] In view of this, the technical problem solved by the embodiments of the present application is to provide a transmission device of a radiotherapy bed and a radiotherapy device, so as to overcome all or part of the problems of the radiotherapy device in the prior art.

[0005] An embodiment of the present application provides a transmission device for a radiotherapy bed, the transmission device being installed on a bed frame of the radiotherapy bed, the transmission device comprising a steel belt, a first fixed support portion and a second fixed support portion, the first fixed support portion and the second fixed support portion being installed on the bed frame at both ends along a movement direction of the radiotherapy bed, and supporting the steel belt to move between the first fixed support portion and the second fixed support portion, the bed board of the radiotherapy bed or a drag plate connected to the bed board being fixed to the steel belt, and moving relative to the bed frame along with the steel belt.

[0006] Optionally, the first fixed support portion is a transmission wheel, and the second fixed support portion is a support wheel. The drive motor drives the transmission wheel to rotate, and the transmission wheel drives the steel belt thereon to move between the transmission wheel and the support wheel.

[0007] Optionally, the bed plate of the radiotherapy bed or the carriage connected to the bed plate is connected to the bed frame via a pair of guide rails, and the bed plate of the radiotherapy bed or the carriage connected to the bed plate moves relative to the bed frame via the guide rails.

[0008] Optionally, at least one pair of guide rail pairs is an MV type or a crossed roller guide rail pair.

[0009] Optionally, the drag plate and the steel belt are fixed by a connecting plate.

[0010] Optionally, the transmission wheel and the support wheel are fixed to the back side of the bed frame through a bearing support seat.

[0011] Optionally, the support shaft of the transmission wheel is connected to the drive motor.

[0012] Optionally, the steel belt is provided with N through holes in the length direction, the transmission wheel cylinder is provided with M first protrusions, at least one first protrusion is engaged with a through hole; and / or, the support wheel cylinder is provided with P second protrusions, at least one second protrusion is engaged with a through hole.

[0013] Optionally, the N through holes are arranged equidistantly in the length direction of the steel belt, the M first protrusions are arranged circumferentially on the cylindrical surface of the transmission wheel, and the P second protrusions are arranged circumferentially on the cylindrical surface of the support wheel.

[0014] Optionally, a position feedback device is also included, and the position feedback device is fixed on the carriage.

[0015] Optionally, the position feedback device is a pull-rope displacement sensor, and the end of the pull-rope of the pull-rope displacement sensor is connected to the drag plate.

[0016] Optionally, the end of the pull rope of the pull rope displacement sensor is fixed to a connecting plate on the drag plate.

[0017] Optionally, a braking mechanism is also included, which controls the support wheels to achieve braking by sending a braking control force.

[0018] Optionally, the braking mechanism is an electromagnetic brake, which is connected to one end of the support shaft of the support wheel and achieves braking by clamping the support wheel.

[0019] Optionally, an encoder is also included, and the encoder is connected to the other end of the support shaft of the support wheel.

[0020] Optionally, the encoder is connected to a position feedback device to perform a closed-loop position feedback operation.

[0021] The embodiment of the present application also provides a radiotherapy bed using the above-mentioned transmission device.

[0022] The embodiment of the present application also provides a radiotherapy device using the above-mentioned radiotherapy bed.

[0023] The beneficial effects of the technical solution provided by the embodiments of the present application include at least:

[0024] In the embodiment of the present application, the transmission device is installed on the bed frame of the radiotherapy bed, and the transmission device includes a steel belt, a first fixed support part and a second fixed support part. The first fixed support part and the second fixed support part are both installed on the bed frame at both ends along the movement direction of the radiotherapy bed, and support the steel belt to move between the first fixed support part and the second fixed support part. The bed plate of the radiotherapy bed or the drag plate connected to the bed plate is fixed to the steel belt and moves relative to the bed frame with the steel belt. Therefore, the embodiment of the present application uses a rigid steel belt as a transmission mechanism, and the steel belt is not easy to deform during long-distance transmission, the transmission distance is long, and the transmission process is stable, which meets the needs of long-distance movement of patients during radiotherapy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0026] Figure 1 A schematic diagram of the three-dimensional structure of a moving device provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of the three-dimensional structure of a moving device provided in an embodiment of the present application in another direction;

[0028] Figure 3 for Figure 1 Right view of;

[0029] Figure 4 A schematic diagram of the three-dimensional structure of a transmission wheel of a moving device provided in an embodiment of the present application;

[0030] Figure 5 A schematic diagram of the three-dimensional structure of a support wheel of a moving device provided in an embodiment of the present application;

[0031] Figure 6 A schematic diagram of the three-dimensional structure of a steel belt of a moving device provided in an embodiment of the present application;

[0032] The reference numerals represent:

[0033] 1-bed frame, 101-first through slot, 2-drag plate, 3-drive motor, 4-transmission wheel, 401-first protrusion, 5-guide rail pair, 501-first guide rail, 502-second guide rail, 6-steel belt, 601-through hole, 7-support wheel, 701-second protrusion, 8-connecting plate, 9-pull rope displacement sensor, 10-electromagnetic brake, 11-encoder. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0035] Embodiment 1

[0036] like Figure 1-Figure 3 As shown, according to an embodiment of the present application, a transmission device is installed on a bed frame 1 of a radiotherapy bed, and the transmission device includes a steel belt 6, a first fixed support portion and a second fixed support portion. The first fixed support portion and the second fixed support portion are both installed on the bed frame 1 at both ends along the movement direction of the radiotherapy bed, and support the steel belt 6 to move between the first fixed support portion and the second fixed support portion. The bed board of the radiotherapy bed or the drag plate 2 connected to the bed board is fixed to the steel belt 6, and moves relative to the bed frame 1 with the steel belt 6.

[0037] Therefore, the embodiment of the present application uses a rigid steel belt 6 as a transmission mechanism. The steel belt 6 is not easily deformed during long-distance transmission, has a long transmission distance, and a stable transmission process, thereby meeting the need for long-distance movement of patients during radiotherapy.

[0038] In this embodiment, the steel belt 6 can achieve stable movement under the support or tension of the first fixed support part and the second fixed support part. The length of the steel belt 6 does not affect its processing difficulty. The steel belt 6 is not easily deformed by the support or tension. It has strong rigidity, which effectively solves the problems existing in the existing radiotherapy bed using gear rack or synchronous belt transmission, and achieves the use effect of high transmission rigidity and high movement accuracy. The steel belt 6 will not have problems such as unstable transmission existing in the flexible synchronous belt when the length is increased, and is particularly suitable as a transmission mechanism in the long-distance transportation process.

[0039] Optionally, the first fixed support part may be a transmission wheel 4, and the second fixed support part may be a support wheel 7. The drive motor 3 drives the transmission wheel 4 to rotate, and the transmission wheel 4 drives the steel belt 6 located thereon to move between the transmission wheel 4 and the support wheel 7. By arranging the transmission wheel 4 and the support wheel 7 at both ends of the central axis direction of the frame of the radiotherapy equipment, the drive motor 3 can drive the steel belt 6 to move in this direction through the transmission wheel 4 and the support wheel 7, and the steel belt 6 can achieve stable movement under the tensioning action of the support wheel 7 and the transmission wheel 4. The transmission wheel 3 and the drive motor 3 can be connected by a common latch or coupling, and the structure is simple. The traditional wheel 3 and the support wheel 7 allow the steel belt 6 to adopt the closed loop structure shown in the figure, and the wheel structure will not damage the steel belt 6. The arc surface contact ensures the service life of the steel belt 6. The steel belt 6 adopts a closed loop structure, which is easier to tension and has the effect of storage, thereby reducing the structure and space used for storing the steel belt 6.

[0040] Optionally, the bed plate of the radiotherapy bed or the carriage 2 connected to the bed plate is connected to the bed frame through a pair of guide rails 5, and the bed plate of the radiotherapy bed or the carriage 2 connected to the bed plate moves relative to the bed frame 1 through the guide rails 5. The second guide rail 502 of the guide rail pair 5 of the transmission device can be overhanging relative to the first guide rail 501, and is connected to the bed frame 1 through the first guide rail 501, and the second guide rail 502 of the guide rail pair 5 is connected to the carriage 2, so that the carriage 2 can be overhanging relative to most of the bed frame 1, thereby realizing a large range of movement along the central axis of the radiotherapy equipment frame. The carriage 2 of the embodiment of the present application does not require a long-length bracket, making the transmission device structure more compact, and easier to manufacture, use and maintain. The problem of short movement stroke of conventional radiotherapy beds in the direction of the central axis of the radiotherapy equipment frame, and the resulting problem of treatment range constraint, is solved.

[0041] Optionally, in order to achieve a more stable motion process and the overhanging effect of the carriage 2, so that the applicability of the transmission device is stronger, at least one pair of guide rail pairs 5 in the transmission device is an MV type or a cross roller guide rail pair. The transmission device is provided with at least one pair of MV type or cross roller guide rail pairs, and the MV type or cross roller guide rail pair includes a first guide rail 501 and a second guide rail 502. Compared with the conventional slider-guide rail type guide rail pair, the guide rail-guide rail type guide rail pair does not have the problem of re-matching after the slider part is separated from the guide rail part. Therefore, after the second guide rail 502 is partially overhanging relative to the first guide rail 501, that is, after the carriage 2 is overhanging relative to the bed frame 1, the support and sliding effect of the guide rail pair 5 still exists. By adopting the above-mentioned type of guide rail pair, the stability of the movement of the carriage 2 on the bed frame 1 is guaranteed. When the carriage 2 is overhanging, the self-structural coordination of the guide rail pair 5 is not affected, so that the applicability of the transmission device is stronger.

[0042] Optionally, in order to achieve a stable connection between the steel belt 6 and the carriage 2 and provide installation space for other measuring devices, the carriage 2 and the steel belt 6 are fixed by a connecting plate 8. The steel belt 6 has a certain flexibility and can be directly fixed to the carriage 2, so that the carriage 2 can be driven to move by rotating the transmission wheel 4 by the driving motor 3. At this time, there is a triangular relationship between the connection between the steel belt 6 and the carriage 2, and between the transmission wheel 4 and the support wheel 7. With the movement of the carriage 2, the two hypotenuses of the triangular relationship, i.e., the distance from the support wheel 7 to the connection and the distance from the transmission wheel 4 to the connection, are constantly changing. The force and direction of the force received by the steel belt 6 at both ends of the connection are constantly changing. The steel belt 6 itself is easily deformed or even broken, and the friction between the transmission wheel 4 / support wheel 7 and the steel belt 6 is changed, resulting in an unstable transmission process.

[0043] So, if Figure 3 As shown, by setting a customized connecting plate 8 between the steel belt 6 and the carriage 2, it is ensured that the portion of the steel belt 6 between the driving wheel 4 and the supporting wheel 7 is always parallel to the direction of movement of the carriage 2, the angle of the steel belt 6 relative to the carriage 2 is always constant, and the output torque of the driving motor 3 is always constant. After ensuring the stable output of the driving motor 3, the above-mentioned transmission problem is solved. At the same time, the steel belt 6 as a whole maintains a runway shape and moves on the two wheels. The connection between the steel belt 6 and the connecting plate 8 is not subjected to forces in directions other than the central axis direction of the frame of the radiotherapy equipment. The force acting on the steel belt 6 during the movement of the carriage 2 is ensured to be less than the breaking strength of the steel belt 6, and the reliability of the use of the steel belt 6 can be ensured.

[0044] Optionally, in order to make the structure of the radiotherapy bed more compact and the top of the bed frame 1 more flat and tidy, the transmission wheel 4 and the support wheel 7 of the transmission device are fixed to the back side of the bed frame 1 through a bearing support seat. Figure 2 and 3 As shown, the driving mechanism is arranged on the back side of the bed frame 1, that is, Figure 3 As shown below, the distance between the upper plane of the bed frame 1 and the lower plane of the carriage 2 can be minimized, ensuring that the overall structure of the radiotherapy bed is more compact. At the same time, the built-in drive mechanism is also safer during transportation and use and is not easily affected by collisions.

[0045] In this embodiment, in order to realize the built-in design of the driving mechanism, Figure 1 As shown, a first through slot 101 may also be provided on the plane of the bed frame 1, the length direction of the first through slot 101 is parallel to the central axis direction of the frame of the radiotherapy equipment, the connecting plate 8 passes through the first through slot 101 to be connected to the drag plate 2, and the first through slot 101 realizes a giving way effect for the connecting plate 8.

[0046] Optionally, the support shaft of the transmission wheel 4 is connected to the drive motor 3. The transmission wheel 4 and the drive motor 3 are connected through the support shaft of the transmission wheel 4, and a common connection device such as a coupling or a reducer can be set between the two to achieve a simplified transmission structure and small space occupation.

[0047] Optionally, in order to prevent the steel belt 6 and the transmission wheel 4 from slipping and provide a more accurate and stable transmission, as Figure 4-6 As shown, the steel belt 6 is provided with N through holes 601 in the length direction, the cylindrical surface of the transmission wheel 4 is provided with M first protrusions 401, and at least one first protrusion 401 is engaged with a through hole 601; and / or, the cylindrical surface of the support wheel 7 is provided with P second protrusions 701, and at least one second protrusion 701 is engaged with a through hole 601.

[0048] The transmission through the conventional steel belt 6 and the transmission wheel 4 can only be achieved by the friction between the steel belt 6 and the transmission wheel 4. Once the slip phenomenon occurs, the relationship between the rotation angle or number of turns of the transmission wheel 4 or the driving motor 3 and the movement distance of the carriage 2 collected by the system of the radiotherapy equipment will be wrong, and the transmission accuracy will be affected. Conventionally, the surface roughness of the steel belt 6 or the surface roughness of the transmission wheel 4 / support wheel 7 will be processed, and the pressure between the steel belt 6 and the two wheels will be adjusted by adjusting the distance between the transmission wheel 4 and the support wheel 7, so as to achieve the demand of increasing or ensuring the friction force. Regardless of which of the above methods is used, there will be loss or looseness under continuous use and vibration. In view of this, a through hole 601 is provided on the steel belt 6, and a corresponding protrusion is provided on the transmission wheel 4 and / or the support wheel 7. Through the meshing action between the through hole 601 and the first protrusion 401, it is ensured that there will be no slipping between the steel belt 6 and the transmission wheel 4. Under the premise of high rigidity of the steel belt 6, the through hole 601 is not easy to wear, and its meshing action is stably achieved.

[0049] For example, Figure 4-6 As shown, a ring of equally spaced through holes 601 is provided in the length direction of the steel belt 6, and a circumferentially arranged first protrusion 401 is provided on the transmission wheel 4. The steel belt 6 and the transmission wheel 4 can realize the meshing action of the synchronous belt and the synchronous wheel, and at the same time overcome the problem that the synchronous belt needs regular maintenance and replacement, high maintenance cost and low safety of use.

[0050] Of course, the arrangement of the through holes 601 is not limited to the above arrangement, and can also be arranged in a multi-row parallel structure, the main purpose is to ensure that during the transmission process, the portion of the steel belt 6 other than the through holes 601 can be attached to the portion other than the first protrusion 401 of the cylindrical surface of the transmission wheel 4, and the first protrusion 401 can mesh with the through holes 601. At the same time, the arrangement of the first protrusion 401 corresponds to the above requirements, and does not require meshing everywhere like the synchronous belt and the synchronous wheel.

[0051] However, in order to ensure the rigidity of the steel belt 6, it is most appropriate to arrange the through holes 601 at equal intervals. Under the actual condition that the width of the steel belt 6 is limited, a row of closed-loop through holes 601 can be set. At this time, the first protrusion 401 on the transmission wheel 4 is designed for the steel belt 6. In terms of processing symmetry and aesthetics, it is most appropriate to design a first protrusion 401 arranged in a circle.

[0052] At the same time, the equally spaced through holes 601 can be used to connect with the connecting plate 8, ensuring that the steel belt 6 does not require additional processing, completes the fixation with the connecting plate 8, and ensures that the overall structure of the steel belt 6 is the same everywhere, and there is no problem of local uneven force.

[0053] Optionally, in order to achieve stable meshing and ensure the service life of the steel belt 6, N through holes 601 are arranged equidistantly in the length direction of the steel belt 6, M first protrusions 401 are arranged circumferentially on the cylindrical surface of the transmission wheel 4, and P second protrusions 701 are arranged circumferentially on the cylindrical surface of the support wheel 7. The uniformity of the overall structure of the steel belt 6 can be ensured by setting the through holes 601 at equal intervals. During the transmission process, the steel belt 6 will not have the problem of uneven local force. The above has been explained accordingly and will not be repeated here. In order to ensure the overall transmission effect, the support wheel 7 is also designed with a corresponding second protrusion 701. The support wheel 7 can be set to a structure consistent with the transmission wheel 4 to achieve meshing with the steel belt 6, so that the force between the steel belt and the support wheel 7 is consistent with the force between the steel belt 6 and the transmission wheel 4, and the overall force of the steel belt 6 is more balanced and the service life is longer.

[0054] Optionally, a position feedback device is also included, and the position feedback device is fixed on the carriage 2. The position feedback device is connected to the carriage 2, and the position feedback device provides real-time feedback on the position of the carriage 2 relative to the bed frame 1, ensuring that the accurate position can be acquired in real time when the patient is moved, which is convenient for adjustment during the treatment process. In this embodiment, the position feedback device can be a grating ruler, which has high precision and can provide accurate position data.

[0055] Optionally, the position feedback device can also be a pull-wire displacement sensor 9, and the end of the pull-wire displacement sensor 9 is fixed to the carriage 2. By analyzing that the carriage 2 moves in a straight line, a grating ruler is used to detect the position of the carriage 2 in the direction of the central axis of the radiotherapy equipment frame. The equipment cost is relatively high, the installation of the grating ruler requires high precision, and the actual installation is difficult. Figure 2 As shown, by setting a pull rope displacement sensor 9 on the bed frame 1, the displacement distance of the end of the pull rope is measured by the pull rope displacement sensor 9, and the position of the drag plate 2 in the direction of the central axis of the radiotherapy equipment frame can be measured by conversion, thereby realizing a low-cost and low-installation difficulty detection method.

[0056] Optionally, the end of the rope of the rope displacement sensor 9 can also be fixed to the connecting plate 8 on the carriage 2. The connecting plate 8 is used to provide an installation position for the end of the rope of the rope displacement sensor 9, and the movement of the carriage 2 drives the connecting plate 8, so that the connecting plate 8 moves the end of the rope of the rope displacement sensor 9. The connecting plate 8 is used as a connecting component between the steel belt 6 and the carriage 2. Through the above connection method, the rope sensor 9 measures the displacement data of the connecting plate 8, which can reflect the movement distance of the steel belt 6 from the side, so as to facilitate the subsequent detection of the working condition of the drive motor 3.

[0057] Optionally, a braking mechanism is also included, which controls the support wheel 7 by sending a braking control force to achieve braking. The braking mechanism can perform a braking effect of the transmission device through system instructions to prevent the inertia effect from causing the carriage 2 to move forward and deviate from the specified position.

[0058] Optionally, the braking mechanism is an electromagnetic brake 10, which is connected to one end of the support shaft of the support wheel 7, and achieves braking by clamping the support wheel 7. After the carriage 2 is determined to move to the specified position by the pull rope displacement sensor 9 or detecting the rotation angle of the transmission wheel 4, the driving motor 3 stops rotating, and at the same time, the electromagnetic brake 10 clamps one end of the support shaft of the support wheel 7, so that the support wheel 7 stops transmitting. Due to the design of the through hole 601 of the steel belt 6, through the meshing action between the through hole 601 and the first protrusion 401, and / or the second protrusion 701, the steel belt 6 stops transmitting, and the connecting plate 8 no longer pulls the carriage 2, thereby achieving braking of the carriage 2. Due to the meshing and tensioning action between the support wheel 7, the steel belt 6 and the transmission wheel 4, after the support wheel 7 stops rotating, the transmission wheel 4 can also be braked by the steel belt 6.

[0059] Of course, an electromagnetic brake 10 can also be set at one end of the support shaft of the transmission wheel 4 to achieve simultaneous braking of the support wheel 7 and the transmission wheel 4. In order to reduce costs, considering the installation positions of the drive motor 3 and the pull-rope displacement sensor 9, connecting the electromagnetic brake to the support shaft of the support wheel 7 can improve space utilization, save costs and reduce installation difficulty.

[0060] Optionally, in order to detect the transmission effect of the steel belt 6, the transmission device may further include an encoder 11, such as Figure 2 As shown, the encoder 11 is connected to the other end of the support shaft of the support wheel 7. The encoder 11 can detect the transmission angle of the support wheel 7, and combined with the wheel diameter of the support wheel 7, the movement distance of the steel belt 6, that is, the movement distance of the carriage 2, can be converted. By also arranging an encoder on the transmission wheel 4 or the drive motor 3, through the data collected by the two encoders and the size relationship between the transmission wheel 4 and the support wheel 7, it can be concluded whether the transmission ratio is consistent with the design, that is, it can be concluded whether the steel belt 6 has a slip problem, thereby realizing the detection of the transmission effect.

[0061] Optionally, the encoder 11 is connected to a position feedback device to perform a closed-loop position feedback operation. The encoder 11 can work in conjunction with the pull rope displacement sensor 9. By comparing the encoder 11 data on the support wheel 7, it can also be determined whether the steel belt 6 has a slip problem. In this case, the encoder can be omitted from the transmission wheel 4, which reduces the equipment investment of the encoder and makes the structure on one side of the transmission wheel 4 neater, and can also detect the transmission effect.

[0062] Combined with the above-mentioned premise of setting the through hole 601 on the steel belt 6 to ensure that there is no slippage between the steel belt 6 and the transmission wheel 4 / support wheel 7, the encoder 11 can also be used to detect the connection relationship between the drive motor 3 and the transmission wheel 4, and to detect the working state of the drive motor 3. When the connection between the drive motor 3 and the transmission wheel 4 is unstable, the drive motor 3 drives the transmission wheel 4 to rotate. The speed of the drive motor 3 is set by the control system, and the encoder 11 detects the actual transmission angle of the support wheel 7. When the data detected by the encoder 11 is inconsistent with the speed of the drive motor 3 displayed by the system, it can be concluded that the drive motor 3 itself has a fault, or the connection relationship between the drive motor 3 and the transmission wheel 4 is invalid or unstable. The detection problem of the drive motor 3 is solved.

[0063] The embodiment of the present application also provides a radiotherapy bed using the above-mentioned transmission device.

[0064] Based on the use of the above-mentioned transmission device, the radiotherapy bed can move the patient's affected part to the designated position for treatment with high precision and accuracy. At the same time, by using the above-mentioned transmission device, the radiotherapy bed can realize a large range of movement along the central axis direction of the radiotherapy equipment frame, and the treatment range is large.

[0065] The embodiment of the present application also provides a radiotherapy device, which uses the above-mentioned radiotherapy bed. By using the above-mentioned radiotherapy bed, the overall structure of the radiotherapy device is compact, the overall installation difficulty is reduced, and the maintenance and equipment costs are reduced.

[0066] Of course, implementing any technical solution of the embodiments of the present application does not necessarily require achieving all of the above advantages at the same time.

[0067] The expressions "first", "second", "the first" or "the second" used in various embodiments of the present application may modify various components regardless of order and / or importance, but these expressions do not limit the corresponding components. The above expressions are only used for the purpose of distinguishing an element from other elements. For example, a first user device and a second user device represent different user devices, although both are user devices. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present disclosure.

[0068] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the attached claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application. Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the embodiments of the present application and their equivalents, the embodiments of the present application are also intended to include these modifications and variations.

Claims

1. A transmission device for a radiotherapy bed, characterized in that: The transmission device is mounted on the bed frame (1) of the radiotherapy bed, and comprises a steel belt (6), a first fixed support portion and a second fixed support portion. The first fixed support portion and the second fixed support portion are both mounted on the bed frame (1) at two ends along the movement direction of the radiotherapy bed, and support the steel belt (6) to move between the first fixed support portion and the second fixed support portion. The drag plate (2) connected to the bed board of the radiotherapy bed is fixed to the steel belt (6) via a connecting plate (8), and moves relative to the bed frame (1) along with the steel belt (6). The first fixed support part is a transmission wheel (4), the second fixed support part is a support wheel (7), a drive motor (3) drives the transmission wheel (4) to rotate, and the transmission wheel (4) drives the steel belt (6) located thereon to move between the transmission wheel (4) and the support wheel (7).

2. The transmission device according to claim 1, characterized in that: The bed plate of the radiotherapy bed or the carriage (2) connected to the bed plate is connected to the bed frame (1) via a pair of guide rails (5); the bed plate of the radiotherapy bed or the carriage (2) connected to the bed plate moves relative to the bed frame (1) via the guide rails (5).

3. The transmission device according to claim 2, characterized in that: The at least one pair of guide rail pairs (5) is an MV type or cross roller guide rail pair; the MV type or cross roller guide rail pair comprises a first guide rail (501) and a second guide rail (502), wherein the second guide rail (502) can be partially cantilevered relative to the first guide rail (501).

4. The transmission device according to claim 3, characterized in that: The transmission wheel (4) and the support wheel (7) are fixed on the back side of the bed frame (1) via a bearing support seat.

5. The transmission device according to claim 4, characterized in that: The supporting shaft of the transmission wheel (4) is connected to the driving motor (3).

6. The transmission device according to claim 1, characterized in that: The steel belt (6) is provided with N through holes (601) in the length direction, the cylindrical surface of the transmission wheel (4) is provided with M first protrusions (401), and at least one of the first protrusions (401) is meshed with one of the through holes (601); and / or the cylindrical surface of the support wheel (7) is provided with P second protrusions (701), and at least one of the second protrusions (701) is meshed with one of the through holes (601).

7. The transmission device according to claim 6, characterized in that: The N through holes (601) are arranged equidistantly in the length direction of the steel belt (6), the M first protrusions (401) are arranged circumferentially on the cylindrical surface of the transmission wheel (4), and the P second protrusions (701) are arranged circumferentially on the cylindrical surface of the support wheel (7).

8. The transmission device according to claim 1, characterized in that: It also comprises a position feedback device, wherein the position feedback device is fixed on the carriage (2).

9. The transmission device according to claim 8, characterized in that: The position feedback device is a pull-rope displacement sensor (9), and the end of the pull-rope of the pull-rope displacement sensor (9) is connected to the drag plate (2).

10. The transmission device according to claim 9, characterized in that: The end of the pull rope of the pull rope displacement sensor (9) is fixed to the connecting plate (8) on the drag plate (2).

11. The transmission device according to claim 1, characterized in that: It also comprises a braking mechanism, which controls the supporting wheel (7) by sending a braking control force to achieve braking.

12. The transmission device according to claim 11, characterized in that: The braking mechanism is an electromagnetic brake (10), which is connected to one end of a support shaft of the support wheel (7) and achieves braking by clamping the support wheel (7).

13. The transmission device according to claim 8, characterized in that: It also comprises an encoder (11), wherein the encoder (11) is connected to the other end of the support shaft of the support wheel (7).

14. The transmission device according to claim 13, characterized in that: The encoder (11) is connected to the position feedback device to perform a closed-loop position feedback operation.

15. A radiotherapy couch, characterized in that: A transmission device comprising any one of claims 1-14.

16. A radiotherapy device, characterized in that: Comprising the radiation therapy couch as claimed in claim 15.

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