CN217246286U - Transmission device, multi-leaf collimator and radiotherapy equipment - Google Patents

Abstract

The embodiment of the specification provides a transmission device, a multi-leaf collimator and radiotherapy equipment. The transmission device comprises a first shell, a first connecting piece and a second connecting piece; a first housing having a through hole formed therein; the first connecting piece is arranged at one end of the through hole, a first thrust bearing piece is sleeved outside the first connecting piece, and two ends of the first thrust bearing piece in the extending direction of the through hole are respectively abutted against the first connecting piece and the first shell; and the second connecting piece is arranged at the other end of the through hole, a second thrust bearing piece is sleeved outside the second connecting piece, and two ends of the second thrust bearing piece in the extending direction of the through hole are respectively abutted to the second connecting piece and the first shell. The multi-blade grating comprises the transmission device. The radiotherapy equipment comprises the multi-leaf grating.

Description

Transmission device, multi-leaf collimator and radiotherapy equipment

Technical Field

The specification relates to the technical field of medical instruments, in particular to a transmission device, a multi-leaf collimator and radiotherapy equipment.

Background

The role and position of precision radiotherapy in cancer treatment is increasingly highlighted. Among them, Multi-Leaf Collimator (MLC) is a key core device for performing precise radiotherapy, performing conformal and intensity modulated therapy, and improving the therapeutic effect. A multi-leaf grating is generally composed of a plurality of pairs of tungsten alloy leaves and a driving device (typically a motor). The driving device can respectively drive each leaf blade to reach a preset position, and finally a closed radiation field close to the shape of the tumor is formed. The driving modes of the blades are generally divided into gear driving and screw rod driving, wherein in the screw rod driving mode, when the screw rod is directly connected with an output shaft of the motor, the screw rod and the output shaft may have a non-coaxial problem, and when the screw rod is indirectly connected with the output shaft of the motor, the coupling mechanism may bring extra back clearance, which affects the precision of screw rod transmission and blade movement. Therefore, it is desirable to provide a transmission that addresses the problem of misalignment and backlash.

SUMMERY OF THE UTILITY MODEL

One of the embodiments of the present specification provides a transmission device, including a first housing, a first connecting member, and a second connecting member; the first shell is internally provided with a through hole; the first connecting piece is arranged at one end of the through hole, a first thrust bearing piece is sleeved outside the first connecting piece, and two ends of the first thrust bearing piece in the extending direction of the through hole are respectively abutted against the first connecting piece and the first shell; and the second connecting piece is arranged at the other end of the through hole, a second thrust bearing piece is sleeved outside the second connecting piece, and two ends of the second thrust bearing piece in the extending direction of the through hole are respectively abutted against the second connecting piece and the first shell.

In some embodiments, a first hole groove coaxial with the through hole is formed in the first connecting piece along the extending direction of the through hole, and a second hole groove coaxial with the through hole is formed in the second connecting piece along the extending direction of the through hole.

In some embodiments, the first connecting member includes a first portion provided with the first hole groove detachably connected to the driven shaft or the driving shaft, and a second portion detachably provided in the second hole groove.

In some embodiments, the first hole groove penetrates along the extending direction of the through hole, so that the second hole groove is detachably connected with the driven shaft or the driving shaft penetrating through the first hole groove.

In some embodiments, the inner wall of the through hole is provided with a convex structure in the radial direction; the protruding structure is perpendicular to the extending direction of the through hole, close to the side face of the first connecting piece and abutted against one end, close to the second connecting piece, of the first thrust bearing piece; the protruding structure is perpendicular to the extending direction of the through hole, close to the side face of the second connecting piece and abutted against one end, close to the first connecting piece, of the second thrust bearing piece.

In some embodiments, the outer wall of the first connecting piece is a stepped structure, and a side surface of the stepped structure perpendicular to the extending direction of the through hole is abutted against one end of the first thrust bearing piece away from the second connecting piece.

In some embodiments, the outer wall of the second connecting piece is a stepped structure, and a side surface of the stepped structure perpendicular to the extending direction of the through hole is abutted against one end of the second thrust bearing piece away from the first connecting piece.

In some embodiments, a second housing and a third connector are also included; the second shell is detachably connected with the first shell; the third connecting piece is arranged in the second shell and is detachably connected with the second connecting piece, and a third hole groove coaxial with the through hole is formed in the third connecting piece along the extending direction of the through hole; the third connecting piece is detachably connected with the driving shaft or the driven shaft through the third pore groove.

One of the embodiments of the present specification provides a multi-leaf grating, which includes a driving motor, a lead screw, a leaf, and any one of the above-mentioned transmission devices; the driving motor is in transmission connection with the screw rod through the transmission device, and the screw rod is connected with the blades.

One embodiment of the specification provides a radiotherapy device, which comprises the multi-leaf grating.

Some embodiments of this specification provide a transmission through indirect connection driving shaft and driven shaft, have solved the disalignment problem that direct connection easily leads to. Furthermore, the distance between the first connecting piece and the second connecting piece is adjustable, and the first thrust bearing piece and the second thrust bearing piece are matched with the matching surface of the first thrust bearing piece and the second thrust bearing piece to be tightly attached to each other, so that extra back clearance between the transmission device component structures is eliminated, and the precision is improved. In addition, the split arrangement of the first shell and the second shell reduces the requirements on processing and installation errors, improves the fault tolerance rate and increases the economy.

Drawings

The present description will be further explained by way of exemplary embodiments, which will be described in detail by way of the accompanying drawings. These embodiments are not intended to be limiting, and in these embodiments like numerals are used to indicate like structures, wherein:

FIG. 1 is a schematic diagram of a transmission according to some embodiments herein;

FIG. 2 is a schematic illustration of a transmission connection according to some embodiments herein;

FIG. 3 is a schematic illustration of another linkage of the transmission according to some embodiments herein;

FIG. 4 is a schematic illustration of another linkage of the transmission according to some embodiments herein;

FIG. 5 is a schematic view of another configuration of a transmission according to some embodiments of the present disclosure;

FIG. 6 is an exploded schematic view of another configuration of a transmission according to some embodiments of the present disclosure;

FIG. 7 is a schematic illustration of another configuration of a transmission according to some embodiments of the present disclosure;

FIG. 8 is a schematic diagram of a blade attachment configuration for a multi-leaf grating according to some embodiments of the present disclosure.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only examples or embodiments of the present description, and that for a person skilled in the art, the present description can also be applied to other similar scenarios on the basis of these drawings without inventive effort. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.

As used in this specification and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" are intended to cover only the explicitly identified steps or elements as not constituting an exclusive list and that the method or apparatus may comprise further steps or elements.

The medical equipment frequently used in tumor treatment is radiotherapy equipment, and tumor cells are killed by utilizing the radiation emitted by the radiotherapy equipment. Radiotherapy apparatus generally comprises: a radioactive source; a multi-leaf collimator (also known as a multi-leaf collimator) for conformal adjustment of radiation emitted by the radiation source; a control system for controlling the movement of the vanes of the multi-vane grating; and the monitoring system is used for monitoring whether the blade of the multi-blade grating moves to a preset position. A multi-leaf grating is generally composed of a plurality of pairs of tungsten alloy leaves and a driving device (typically a motor). The driving device can respectively drive each leaf blade to reach a preset position, and finally a closed radiation field close to the shape of the tumor is formed. The driving method of the blade is generally classified into a gear driving method and a screw driving method. The gear-driven transmission mechanism usually requires a relatively large installation space (the motor is generally installed in the width direction of the blade), the number of the blades is limited, and the thickness of the blades is relatively large. The thickness of the blade is directly related to the conformability of the multi-blade grating, so that the gear-driven transmission mechanism cannot adapt to the thinner and thinner form of the blade slowly. In the screw rod driving mode, when the screw rod is connected with the output shaft of the motor, the problem of non-coaxial between the screw rod and the output shaft is easy to occur, and a back clearance is easy to exist between the screw rod and the output shaft, so that the transmission precision of the screw rod and the motion precision of the blades are influenced.

Some embodiments of the present disclosure provide a transmission device, which may be used for transmission connection between a driving shaft (e.g., an output shaft of a motor) and a driven shaft (e.g., a lead screw), and may also be used for transmission connection between a coupling (e.g., a coupling connected to an output shaft of a motor) and a driven shaft (e.g., a lead screw). The transmission device can include a first housing, a first connector, and a second connector. The first shell provides an installation platform for other parts, and the first connecting piece and the second connecting piece are used for transmitting motion and power. The first connecting piece is arranged at one end of the through hole and can be used for connecting and fixing a driven shaft or a driving shaft (such as a screw rod); the second connecting piece is arranged at the other end of the through hole and can be used for connecting and fixing other transmission parts (such as a screw rod, a coupler and the like). The outside cover of first connecting piece is equipped with first thrust bearing spare, and the outside cover of second connecting piece is equipped with second thrust bearing spare, and first thrust bearing spare and second thrust bearing spare can bear the axial thrust of axis of rotation (for example driving shaft, driven shaft etc.) in the rotation, have solved the problem of the disalignment that probably exists between driving shaft and the driven shaft. The two ends of the first thrust bearing piece in the extending direction of the through hole are respectively abutted to the first connecting piece and the first shell, the two ends of the second thrust bearing piece in the extending direction of the through hole are respectively abutted to the second connecting piece and the first shell, and the clearance between the first connecting piece and the second connecting piece is reduced as much as possible through the matching of the first thrust bearing piece and the second thrust bearing piece, so that the transmission precision is improved.

FIG. 1 is a schematic diagram of a transmission 100 according to some embodiments herein. The transmission 100 according to the embodiment of the present specification will be described in detail below. It should be noted that the following examples are only for explaining the present application and do not constitute a limitation to the present application.

As shown in fig. 1, the transmission 100 may include a first housing 110, a first link 120, and a second link 130; a first case 110 having a through hole 111 formed therein; the first connecting piece 120 is arranged at one end of the through hole 111, a first hole groove 121 coaxial with the through hole 111 is arranged in the first connecting piece 120 along the extending direction of the through hole 111, a first thrust bearing piece 140 is sleeved outside the first connecting piece 120, and two ends of the first thrust bearing piece 140 in the extending direction of the through hole 111 are respectively abutted to the first connecting piece 120 and the first shell 110; and a second connecting member 130 disposed at the other end of the through hole 111, wherein a second hole groove 131 coaxial with the through hole 111 is disposed inside the second connecting member 130 along the extending direction of the through hole 111, and a second thrust bearing member 150 is sleeved outside the second connecting member 130, and two ends of the second thrust bearing member 150 in the extending direction of the through hole 111 are respectively abutted to the second connecting member 130 and the first housing 110. The direction along which the through-hole 111 extends in this specification may be understood as: along the direction of extension of the axis of the through-hole 111.

The first housing 110 serves as a housing to provide a mounting platform for other components and to isolate the other components from the outside so as to provide protection. In some embodiments, the first housing 110 can also be used to connect the transmission 100 with other devices (e.g., a drive shaft and/or a driven shaft and/or a coupling) to achieve further reinforcement. For example, the first housing 110 may be a flange or other device that can be used for mounting and fixing, and when one end of the transmission 100 is connected to a coupling, the first housing 110 may be further reinforced by the flange connection with the coupling. In some embodiments, the material of the first housing 110 may include a hard material such as an alloy, for example, carbon steel, copper-nickel alloy, and the like.

The first coupling element 120 can be used to couple a driven or driving shaft. In some embodiments, the first linkage 120 may be coupled to the driven/driving shaft and the second linkage 130, respectively. In some embodiments, the first connector 120 may be disposed at one end of the through hole 111, and a first hole groove 121 coaxial with the through hole 111 is disposed inside along an extending direction of the through hole 111, and the first hole groove 121 may be used to connect a transmission member, such as a driven shaft, etc. In some embodiments, the driven or driving shaft may be fixedly installed in the first hole groove 121, thereby achieving the connection of the first link 120 with the driven or driving shaft. The driving shaft is a shaft directly connected to a power output means (e.g., a motor, etc.), and when the first link 120 is connected to the driving shaft and the second link 130, respectively, power is transmitted from the driving shaft to the first link 120 and then to a member (e.g., a driven shaft) connected to the second link 130 through the second link 130; when the first connecting member 120 is connected to the driven shaft and the second connecting member 130, respectively, the second connecting member 130 may be connected to the driving shaft, and power is transmitted from the driving shaft to the second connecting member 130, and then transmitted to the driven shaft connected to the first connecting member 120 through the first connecting member 120. It should be noted that the first connecting element 120 and the second connecting element 130 may be connected to the driving shaft or the driven shaft respectively, but may not be connected to both the driving shaft and the driven shaft simultaneously. In some embodiments, the first connector 120 may be connected with the second connector 130, for example, the first connector 120 may be inserted into a second hole groove 131 of the second connector 130 coaxial with the through hole 111. In some embodiments, the first connector 120 may employ a coupling or the like that can be used for the shaft-to-shaft connection.

In some embodiments, the first hole groove 121 is used to fix the driven shaft or the driving shaft, and the driven shaft or the driving shaft is connected to the first connecting member 120. In some embodiments, the first hole 121 may be a blind hole disposed along the extending direction of the through hole 111, and the opening of the first hole 121 is located at an end of the first connecting member 120 far away from the second connecting member 130. In some embodiments, the first hole groove 121 may also penetrate the first connector 120 in the extending direction of the through hole 111.

In some embodiments, the first thrust bearing member 140 is disposed outside the first connecting member 120, and two ends of the first thrust bearing member 140 in the extending direction of the through hole 111 abut against the first connecting member 120 and the first housing 110, respectively. The first thrust bearing member 140 can bear the radial thrust of the driving/driven shaft connected to the first connecting member 120 during rotation, thereby ensuring that the axis of the driving/driven shaft does not deflect and improving the stability of the transmission device 100 during transmission.

In some embodiments, the interference fit, clearance fit, or transition fit may be between the outer wall of the first thrust bearing piece 140 and the inner wall of the through bore 111, and between the inner bore wall of the first thrust bearing piece 140 and the outer wall of the first connector 120. In some embodiments, interference fits may be used between the outer wall of the first thrust bearing piece 140 and the inner wall of the through hole 111 and between the inner hole wall of the first thrust bearing piece 140 and the outer wall of the first connecting piece 120, so as to enhance the installation strength of the first thrust bearing piece 140 and prevent the first thrust bearing piece 140 from shaking during operation.

In some embodiments, the first thrust bearing piece 140 may include, but is not limited to, a thrust ball bearing, a thrust cylindrical roller bearing, a thrust needle bearing, a thrust tapered roller bearing, a self-aligning thrust roller bearing, and the like.

In some embodiments, the second link 130 may be used to connect transmission components, such as the first link 120, a drive shaft, a driven shaft, a coupling, and the like. In some embodiments, the second connector 130 may be disposed at the other end of the through hole 111, and a second hole 131 coaxial with the through hole 111 is disposed inside along the extending direction of the through hole 111, and the second hole 131 may be used to connect a transmission member, such as the first connector 120, and the like. In some embodiments, the second connecting member 130 may be connected to the driving shaft/driven shaft/coupling, for example, one end of the second connecting member 130 away from the first connecting member 120 may be connected to one end of the coupling by means of a snap connection or the like, and the other end of the coupling is connected to the driving shaft; for another example, the end of the second connecting member 130 away from the first connecting member 120 may be directly connected to the driving shaft. In some embodiments, the second connector 130 may employ a coupling or the like that can be used for shaft-to-shaft connections.

In some embodiments, the second hole 131 is used to fix the driving or driven shaft or the first link 120, thereby achieving the connection of the driving or driven shaft or the first link 120 with the second link 130. In some embodiments, the second slot 131 may be a blind hole disposed along the extending direction of the through hole 111, and the opening of the second slot 131 is disposed at one end of the second connecting member 130 close to the first connecting member 120.

In some embodiments, the second thrust bearing member 150 is sleeved outside the second connecting member 130, and both ends of the second thrust bearing member 150 in the extending direction of the through hole 111 are respectively abutted against the second connecting member 130 and the first housing 110. The second thrust bearing member 150 can bear the radial thrust of the rotating member (e.g., the first connecting member 120) connected to the second connecting member 130 during rotation, thereby ensuring that the axis of the rotating member does not deviate and improving the stability of the transmission device 100 during transmission. The first thrust bearing element 140 and the second thrust bearing element 150 cooperate to ensure that the rotating elements can be coaxial with each other during rotation, thereby improving the transmission stability of the transmission device 100.

In some embodiments, the interference fit, clearance fit, or transition fit may be between the outer wall of the second thrust bearing piece 150 and the inner wall of the through bore 111 and between the inner bore wall of the second thrust bearing piece 150 and the outer wall of the second connector 130. In some embodiments, interference fits may be used between the outer wall of the second thrust bearing piece 150 and the inner wall of the through hole 111 and between the inner hole wall of the second thrust bearing piece 150 and the outer wall of the second connecting piece 130, so as to enhance the installation strength of the second thrust bearing piece 150 and prevent the second thrust bearing piece 150 from shaking during operation.

In some embodiments, the second thrust bearing piece 150 may include, but is not limited to, a thrust ball bearing, a thrust cylindrical roller bearing, a thrust needle bearing, a thrust tapered roller bearing, a self-aligning thrust roller bearing, and the like.

In some embodiments, the first thrust bearing piece 140 and the second thrust bearing piece 150 may be the same or different. The first thrust bearing piece 140 and the second thrust bearing piece 150 may be identical for ease of manufacturing and installation, as well as to reduce the possibility of large transmission 100 clearances that may result from the different specifications of the first thrust bearing piece 140 and the second thrust bearing piece 150.

In some embodiments, the inner wall of the through hole 111 is radially provided with a protruding structure, and the first connecting member 120 and the second connecting member 130 are respectively located at two sides of the protruding structure. The protruding structure is perpendicular to the extending direction of the through hole 111, is close to the side surface of the first connecting piece 120, and abuts against one end of the first thrust bearing piece 140 close to the second connecting piece 120; the protruding structure is perpendicular to the extending direction of the through hole 111 and close to the side of the second connecting member 130, and abuts against one end of the second thrust bearing member 150 close to the first connecting member 120. The protruding structure can separate first thrust bearing piece 140 and second thrust bearing piece 150 to play the spacing effect of support to first thrust bearing piece 140 and second thrust bearing piece 150, make first thrust bearing piece 140 and second thrust bearing piece 150 remove with protruding structure butt back, unable axial motion that continues to take place, thereby eliminated the axial clearance, promoted the transmission precision.

In some embodiments, the side surface (supporting surface) of the protruding structure perpendicular to the extending direction of the through hole 111 and the side surface (mating surface) of the abutting thrust bearing part perpendicular to the extending direction of the through hole 111 may be matching surfaces to provide a good supporting and limiting effect for the thrust bearing part. For example, if the mating surface of the first thrust bearing piece 140 is planar, the corresponding support surface of the raised structure is also planar. For example, if the mating surface of the first thrust bearing piece 140 is an outer convex surface, the corresponding support surface of the raised structure may be an inner concave surface that mates with the outer convex surface. For another example, the area of the supporting surface of the protruding structure may be greater than or equal to the area of the corresponding mating surface of the second thrust bearing piece 150, so as to maximize the contact area between the protruding structure and the second thrust bearing piece 150, and further enhance the supporting effect of the protruding structure on the second thrust bearing piece 150. For example, the mating surface of the first thrust bearing piece 140 may be provided with a pattern or other structures that make the mating surface uneven, and the supporting surface corresponding to the protruding structure may also be provided with a pattern or other corresponding structures that match with the pattern, so that while the supporting effect of the protruding structure on the first thrust bearing piece 140 is enhanced, the relative rotation between the first thrust bearing piece 140 and the protruding structure can be limited, and the mounting stability of the first thrust bearing piece 140 is further enhanced.

In some embodiments, the outer wall of the first connecting member 120 may have a stepped structure, and a side surface of the stepped structure perpendicular to the extending direction of the through hole 111 abuts against an end of the first thrust bearing member 140 away from the second connecting member 130. The stepped structure and the protruding structure of the first connecting member 120 are respectively abutted to two ends of the first thrust bearing piece 140, so as to fix, support and limit the first thrust bearing piece 140, and meanwhile, the first thrust bearing piece 140 can play a role in buffering between the first connecting member 120 and the protruding structure.

In some embodiments, the outer wall of the second connecting member 130 may have a stepped structure, and a side surface of the stepped structure perpendicular to the extending direction of the through hole 111 abuts against an end of the second thrust bearing member 150 away from the first connecting member 120. The stepped structure and the protruding structure of the second connecting member 130 are respectively abutted to two ends of the second thrust bearing member 150, so that the second thrust bearing member 150 is fixed, supported and limited, and meanwhile, the second thrust bearing member 150 can play a role in buffering between the second connecting member 130 and the protruding structure.

FIG. 2 is a schematic diagram of a transmission connection configuration according to some embodiments herein. The transmission connection mode according to the embodiment of the present specification will be described in detail below. It should be noted that the following examples are only for explaining the present application and do not constitute a limitation to the present application.

As shown in fig. 2, in some embodiments, the first connector 120 may include a first portion 122 provided with a first hole 121 and a second portion 123, the first portion 122 and the second portion 123 are coaxial, an outer diameter of the first portion 122 may be larger than an outer diameter of the second portion 123, and the first hole 121 may be detachably connected to the shaft 180 (driven shaft or driving shaft), so as to implement a transmission connection with the shaft 180. The second portion 123 is detachably disposed in the second slot 131, so as to realize the driving connection between the first connecting member 120 and the second connecting member 130.

In some embodiments, the outer wall of the second portion 123 may be provided with an external thread, and the inner wall of the second hole 131 may be provided with an internal thread matching the external thread, so that the external thread and the internal thread cooperate to realize the threaded connection between the second portion 123 and the second hole 131, and further the threaded connection between the first connecting member 120 and the second connecting member 130. In some embodiments, the distance between the first and second threaded connectors 120, 130 is adjustable. In the process of tightening the screw to draw the distance between the first connecting member 120 and the second connecting member 130, the first thrust bearing piece 140 and the second thrust bearing piece 150 move in opposite directions (i.e., the first thrust bearing piece 140 and the second thrust bearing piece 150 both move toward the center of the through hole 111), until the first thrust bearing piece 140 and the second thrust bearing piece 150 both abut against the protruding structure, at this time, the distance between the first thrust bearing piece 140 and the second thrust bearing piece 150 is minimum, and at the same time, the possible gap between the first thrust bearing piece 140 and the second thrust bearing piece 150 is also minimum, so that the gap existing in the transmission device 100 is eliminated to the maximum, and the transmission precision of the transmission device 100 is improved.

FIG. 3 is a schematic diagram of another linkage of a transmission according to some embodiments herein. FIG. 4 is a schematic view of another connection configuration of a transmission according to some embodiments of the present disclosure. The transmission connection mode according to the embodiment of the present specification will be described in detail below. It should be noted that the following examples are only for explaining the present application and do not constitute a limitation to the present application.

As shown in fig. 3 and 4, in some embodiments, the first hole groove 121 may penetrate the first connector 120 in an extending direction of the through hole 111. The shaft 180 (driven shaft/driving shaft) can be detachably connected to the second hole 131 after passing through the first hole 121, thereby realizing the transmission connection of the first connecting member 120, the second connecting member 130 and the shaft 180. The first connecting member 120 and the second connecting member 130 limit, support and fix the shaft 180 together, so as to enhance the stability of the shaft 180 during rotation. At this time, the length of the first connecting member 120 is relatively short, the processing difficulty is lower, and the production is more convenient.

In some embodiments, the outer wall of the shaft 180 may be provided with external threads, the first and/or second bores 121 and 131 may be provided with internal threads matching the external threads, and the first and/or second connectors 120 and 130 are threadedly coupled to the shaft 180. In some embodiments, the distance between the first and second connectors 120, 130 of the threaded connection is adjustable. In the process of tightening the screw to draw the distance between the first connecting member 120 and the second connecting member 130, the first thrust bearing piece 140 and the second thrust bearing piece 150 move in opposite directions (i.e., the first thrust bearing piece 140 and the second thrust bearing piece 150 both move toward the center of the through hole 111), until the first thrust bearing piece 140 and the second thrust bearing piece 150 both abut against the protruding structure, at this time, the distance between the first thrust bearing piece 140 and the second thrust bearing piece 150 is minimum, and at the same time, the possible gap between the first thrust bearing piece 140 and the second thrust bearing piece 150 is also minimum, so that the gap existing in the transmission device 100 is eliminated to the maximum, and the transmission precision of the transmission device 100 is improved.

In some embodiments, the first hole slot 121 and the second hole slot 131 may be provided with inner threads, that is, the first connecting member 120 and the second connecting member 130 may be screwed with the shaft 180, and the first connecting member 120 and the second connecting member 130 may be adjusted in position relative to the shaft 180, thereby adjusting the distance between the first connecting member 120 and the second connecting member 130. In some embodiments, only one of the first and second connectors 120 and 130 may be provided with internal threads, that is, only one of the first and second connectors 120 and 130 may be screwed to the shaft 180, and the other may be fixedly connected to the shaft 180 (that is, the relative position of the connector to the shaft 180 is not changed), and the screwed connector may adjust the relative position to the shaft 180, thereby adjusting the distance to the other connector.

In some embodiments, the first connector 120 may further be provided with a first reinforcement hole 124 laterally penetrating the first hole groove 121, and the shaft 180 installed in the first hole groove 121 may be reinforced and fixed by tightening a screw matched with the first reinforcement hole 124.

In some embodiments, the second connector 130 may be provided with a second reinforcement hole 134 extending laterally through the second hole groove 131, and a component (e.g., the driving shaft, the driven shaft, the second portion 123, etc.) installed in the second hole groove 131 may be fixed by tightening a screw matched with the second reinforcement hole 134.

In some embodiments, the fixing components matching with the first and second reinforcing holes 124 and 134 may also be other components for reinforcing, such as pins.

FIG. 5 is another schematic diagram of a transmission according to some embodiments herein. Fig. 6 is an exploded view of another configuration of a transmission according to some embodiments of the present disclosure. FIG. 7 is a schematic diagram of another configuration of a transmission according to some embodiments herein. The structure of the transmission according to the embodiment of the present specification will be described in detail below. It should be noted that the following examples are only for explaining the present application and do not constitute a limitation to the present application.

In some embodiments, the transmission 100 may further include a second housing 160 and a third connector 170.

In some embodiments, the second housing 160 is removably coupled to the first housing 110. Through the connection of the first housing 110 and the second housing 160, on one hand, the connection between the transmission device 100 and the driving shaft or the driven shaft is strengthened, and on the other hand, the gap between the third connecting piece 170 and the second connecting piece 130 is reduced as much as possible, so that the overall backlash of the transmission device 100 is reduced, and the transmission precision of the transmission device 100 is improved. In addition, the split type first shell 110 and the split type second shell 160 are lower in design difficulty, lower in processing requirement, higher in economical efficiency, larger in allowable installation error and higher in fault tolerance.

In some embodiments, the second housing 160 and the first housing 110 may be clamped or detachably connected by screws or the like. In some embodiments, the second housing 160 and the first housing 110 may be mating split flanges.

In some embodiments, the third connecting member 170 may be disposed inside the second housing 160, one end of the third connecting member 170 is connected to the driving shaft/driven shaft, and the other end is detachably connected (e.g., snap-fit) to the second connecting member 130, so that the third connecting member 170, the second connecting member 130 and the first connecting member 120 cooperate to realize the driving shaft and the driven shaft.

In some embodiments, a third hole groove 171 coaxial with the through hole 111 is disposed inside the third link 170 along the extending direction of the through hole 111, an opening of the third hole groove 171 is located at a side of the third link 170 away from the second link 130, and the driving/driven shaft is detachably disposed in the third hole groove 171, thereby achieving the driving connection of the third link 170 with the driving/driven shaft.

In some embodiments, the third link 170 is detachably coupled to the driving/driven shaft through the third hole groove 171. The detachable connection can be threaded connection, clamping connection and the like, on one hand, the adjustment of the subsequent transmission device 100 is facilitated, on the other hand, the transmission device 100 can be detached and separated after being used, so that the subsequent transmission device can be continuously put into use, the transmission device 100 can be used in different application scenes for many times, resources are saved, and the utilization rate is improved.

As shown in fig. 5, 6 and 7, for example only, one end of the second housing 160 is fixed at the motor end, the motor output shaft 181 may be installed in the third hole 171 to be connected to the third connecting member 170, the third connecting member 170 is engaged with the transmission 100, the second housing 160 is flange-connected to the first housing 110 of the transmission 100, and the other end of the transmission 100 is screw-connected to the transmission screw 182, so that the transmission connection between the motor output shaft 181 and the transmission screw 182 is achieved.

In some embodiments, the third connector 170 may further be provided with a third reinforcing hole 174 laterally penetrating through the third hole 171, and a component (e.g., the motor output shaft 181) installed in the third hole 171 may be reinforced and fixed by tightening a screw matched with the third reinforcing hole 174, so that the third connector 170 can rotate synchronously with the motor output shaft 181, thereby achieving the transmission connection of the motor output shaft 181 and the third connector 170.

In some embodiments, the first reinforcement holes 124, the second reinforcement holes 134, and the third reinforcement holes 174 may be arranged in the same or different structures. For example, the first reinforcing holes 124 may be circular holes to fix the shaft by screws; the second reinforcement holes 134 may be square holes, and the shaft is fixed by a key (e.g., a flat key, a semicircular key, etc.); the third reinforcing holes 174 may be circular holes, and the shafts may be fixed by pins.

FIG. 8 is a schematic view of a blade attachment configuration for a multi-leaf grating according to some embodiments of the present disclosure. The following describes in detail a blade connection structure of a multi-leaf collimator according to an embodiment of the present disclosure. It should be noted that the following examples are only for explaining the present application and do not constitute a limitation to the present application.

Some embodiments of the present disclosure provide a multi-leaf grating, which includes a driving motor 810, a lead screw 820, a leaf 830, and a transmission. The transmission device may have the same structure as the transmission device 100 described above, and may further include a second housing 160 and a third connecting member 170.

In some embodiments, the driving motor 810 is in driving connection with the lead screw 820 through a driving device, and the lead screw 820 is connected with the blade 830, so that the driving motor 810 can drive the blade 830 to move. In some embodiments, the lead screw 820 may be integral with the drive lead screw 182, i.e., the lead screw 820 and the drive lead screw 182 are the same lead screw. In other embodiments, the lead screw 820 may be fixedly coupled coaxially with the drive lead screw 182.

Some embodiments of the present disclosure also provide a radiotherapy apparatus comprising the multi-leaf grating, which can be used for emitting radiation to kill tumor cells for tumor therapy.

Some embodiments of the present disclosure may provide benefits to the transmission including, but not limited to: the driving shaft and the driven shaft are indirectly connected through the transmission device, so that the problem of non-coaxial connection easily caused by direct connection is solved; the distance between the first connecting piece and the second connecting piece is adjustable, and the first thrust bearing piece and the second thrust bearing piece are matched with the matching surfaces of the first thrust bearing piece and the second thrust bearing piece to be tightly attached to each other, so that extra back clearance between the transmission device component structures is eliminated, and the precision is improved; the split arrangement of the first shell and the second shell reduces the requirements on processing and installation errors, improves the fault-tolerant rate and increases the economy. It is to be noted that different embodiments may produce different advantages, and in different embodiments, any one or combination of the above advantages may be produced, or any other advantages may be obtained.

Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing detailed disclosure is to be regarded as illustrative only and not as limiting the present specification. Various modifications, improvements and adaptations to the present description may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present specification and thus fall within the spirit and scope of the exemplary embodiments of the present specification.

Also, the description uses specific words to describe embodiments of the description. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the specification is included. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the specification may be combined as appropriate.

Similarly, it should be noted that in the foregoing description of embodiments of the specification, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to imply that more features are required than are expressly recited in the claims. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.

Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of the embodiments of the present disclosure. Other variations are also possible within the scope of the present description. Thus, by way of example, and not limitation, alternative configurations of the embodiments of the specification can be considered consistent with the teachings of the specification. Accordingly, the embodiments of the present description are not limited to only those explicitly described and depicted herein.

Claims (10)

1. A transmission comprising a first housing (110), a first coupling member (120) and a second coupling member (130);

the first shell (110) is internally provided with a through hole (111);

the first connecting piece (120) is arranged at one end of the through hole (111), a first thrust bearing piece (140) is sleeved outside the first connecting piece, and two ends of the first thrust bearing piece (140) in the extending direction of the through hole (111) are respectively abutted with the first connecting piece (120) and the first shell (110); and

the second connecting piece (130) is arranged at the other end of the through hole (111), a second thrust bearing piece (150) is sleeved outside the second connecting piece, and two ends of the second thrust bearing piece (150) in the extending direction of the through hole (111) are respectively abutted to the second connecting piece (130) and the first shell (110).

2. The transmission according to claim 1, characterized in that said first connection member (120) is internally provided with a first slot (121) coaxial with said through hole (111) along the extension direction of said through hole (111), and said second connection member (130) is internally provided with a second slot (131) coaxial with said through hole (111) along the extension direction of said through hole (111).

3. Transmission according to claim 2, wherein said first connection member (120) comprises a first portion (122) provided with said first aperture (121) and a second portion (123), said first aperture (121) being removably associated with a driven or driving shaft, said second portion (123) being removably arranged in said second aperture (131).

4. Transmission according to claim 2, wherein said first slot (121) passes through in the direction of extension of said through hole (111) so that said second slot (131) is removably connected to a driven or driving shaft passing through said first slot (121).

5. The transmission device according to claim 1, characterized in that the inner wall of said through hole (111) is provided with a convex structure radially; the protruding structure is perpendicular to the extending direction of the through hole (111), close to the side face of the first connecting piece (120), and abutted against one end, close to the second connecting piece (130), of the first thrust bearing piece (140); the protruding structure is perpendicular to the extending direction of the through hole (111), close to the side face of the second connecting piece (130), and is abutted against one end, close to the first connecting piece (120), of the second thrust bearing piece (150).

6. The transmission device according to claim 5, characterized in that the outer wall of the first connecting piece (120) is a stepped structure, and the side surface of the stepped structure perpendicular to the extending direction of the through hole (111) is abutted with one end of the first thrust bearing piece (140) far away from the second connecting piece (130).

7. The transmission device according to claim 5, characterized in that the outer wall of the second connecting member (130) is a stepped structure, and the side surface of the stepped structure perpendicular to the extending direction of the through hole (111) is abutted with one end of the second thrust bearing member (150) far away from the first connecting member (120).

8. The transmission of claim 1, further comprising a second housing (160) and a third connector (170);

the second housing (160) detachably connected to the first housing (110);

the third connecting piece (170) is arranged in the second shell (160) and is detachably connected with the second connecting piece (130), and a third hole groove (171) which is coaxial with the through hole (111) is arranged in the third connecting piece (170) along the extending direction of the through hole (111); the third connecting piece (170) is detachably connected with the driving shaft or the driven shaft through the third hole groove (171).

9. A multileaf grating comprising a drive motor (810), a lead screw (820), a leaf (830) and a transmission according to any one of claims 1 to 8;

the driving motor (810) is in transmission connection with the screw rod (820) through the transmission device, and the screw rod (820) is connected with the blade (830).

10. A radiotherapy apparatus comprising a multi-leaf grating according to claim 9.

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