WO2019047061A1

WO2019047061A1 - Blade drive mechanism and system

Info

Publication number: WO2019047061A1
Application number: PCT/CN2017/100713
Authority: WO
Inventors: 杨勇强
Original assignee: 西安大医数码科技有限公司; 武汉数码刀医疗有限公司
Priority date: 2017-09-06
Filing date: 2017-09-06
Publication date: 2019-03-14
Also published as: CN211434802U

Abstract

A blade drive mechanism and system, relating to the field of medical instruments. The drive mechanism comprises: a rotation member (1), a rope transmission member (2), a transmission rope (3), a steering member (4), and a pushing block (5); the rope transmission member (2) is linked to the rotation member (1); the steering member (4) is linked to the rope transmission member (2) by means of the transmission rope (3), and is used for making the transmission rope (3) form a blade transmission section (301) along the direction of movement of a blade (X); in addition, the pushing block (5) is simultaneously connected to the blade transmission section (301) and the blade (X). The present blade transmission mechanism drives the movement of the blade (X) by means of the cooperation of the rope transmission member (2), the transmission rope (3), and the steering member (4), increasing the movement speed of the blade (X) and ensuring the reliability and controllability of the movement of the blade (X). Relative to a screw and nut transmission method, the present blade drive mechanism structure is simple to manufacture, manufacturing precision is controllable, and the service life is long.

Description

Blade drive mechanism and system

Technical field

The present invention relates to the field of medical devices, and in particular to a blade driving mechanism and system.

Background technique

A multi-leaf collimator (MLC) is a mechanical moving part that generates a conformal radiation field by the motion of a plurality of blades, and the motion of the blades is mostly realized by a blade driving mechanism. Therefore, it is necessary to provide a blade drive mechanism.

The prior art provides such a blade drive mechanism, comprising: a micro DC motor, a screw connected to an output shaft of the micro DC motor, and a nut threaded on the screw, wherein the blade is connected to the nut, and the screw is driven by the micro DC motor Rotating, and thus driving the nut, drives the blade to move along the axial direction of the screw. Among them, in order to avoid the motion interference between a plurality of blades, the aspect ratio of the screw is as large as possible; the MLC is for the purpose of real-time intensity adjustment of the treatment, and a multi-head screw of 2 to 4 heads is generally used to increase the blade movement speed. Moreover, after the MLC is treated with intensity-modulated treatment, the number of deformation fields in a single treatment is significantly increased, so that the service life of the screw and the nut is required to be in the order of one million times.

The inventors have found that the prior art has at least the following problems:

The blade driving mechanism provided by the prior art has high requirements on the design of the screw and the nut, which makes the manufacturing and manufacturing difficult, and the manufacturing precision is difficult to control.

Summary of the invention

In order to solve the above technical problem, an embodiment of the present invention provides a blade driving mechanism and system. The specific technical solutions are as follows:

In one aspect, a blade drive mechanism is provided, the drive mechanism comprising: a rotating member;

a rope drive member coupled to the rotating member;

a steering member coupled to the rope transmission by a drive rope for forming the transmission rope to form a blade transmission section in a direction of movement of the blade;

A push block that is simultaneously coupled to the blade drive segment and the blade for driving the blade motion.

In a possible design, the rope transmission includes: a first support member, a drive axle;

The drive axle is fixed on the first support member, and the drive axle is coupled to the rotating shaft of the rotating member;

A rope groove is disposed on an outer surface of the drive axle, and the drive rope is coupled to the steering member after the rope groove.

In a possible design, the rope drive member further includes: a wheel sleeve;

The axle sleeve is fixed on the first support member and connected to the outer casing of the rotating member, and the axle sleeve is provided with a slot communicating with the inner cavity;

The drive axle is rotatably sleeved in the axle sleeve;

The rope groove is disposed on an outer surface of a portion of the driving wheel shaft opposite to the slot;

The drive rope is coupled to the steering member through the slot after the rope groove.

In a possible design, the driving axle includes a small diameter segment, a large diameter segment, and a connecting segment that are sequentially connected;

The rope groove is disposed in the small diameter section as a multi-turn thread groove structure;

The large diameter section is provided with a reverse thread groove, the reverse thread groove has the same pitch as the rope groove, and the rotation direction is opposite;

The large diameter section is screwed to the axle sleeve;

The connecting section is coupled to a rotating shaft of the rotating member.

In a possible design, two guide wheels are provided in the slot for guiding the drive rope passing through the slot.

In a possible design, the steering member includes: a first transmission wheel, a second transmission wheel, a third transmission wheel, and a second support member;

The first transmission wheel and the third transmission wheel are disposed at an upper end of the first support member at intervals by a first wheel support;

The right end of the second support member is disposed on the top of the first wheel support, and the left end is disposed on the top of the blade housing;

The second transmission wheel is disposed at a left portion of the second support member through a second wheel support;

The transmission rope sequentially bypasses the first transmission wheel, the second transmission wheel, and the third transmission wheel, and the transmission rope is located between the second transmission wheel and the third transmission wheel. A rope body acts as the blade drive segment.

In a possible design, the driving mechanism further includes: a tightening screw;

The tensioning screw is threadedly passed through the top end of the first support member and the second The support members abut to drive the second support member to move in the direction of blade movement.

In a possible design, the top of the first wheel support is provided with a limit groove, and the right end of the second support is embedded in the limit groove;

a left through end of the second support member is provided with a strip through hole;

The drive mechanism further includes a fastening screw for threading the top of the blade housing after passing through the strip through hole.

In a possible design, the push block includes: a rope connecting section, and a blade connecting section connected to a lower end of the rope connecting section;

The rope connecting section is provided with a downwardly extending rope groove along the moving direction of the blade for accommodating the driving rope;

The rope connecting section is further provided with a fastener for fixing the driving rope in the rope groove;

The blade connecting section is for connection with the blade.

In a possible design, the top of the blade is provided with a push block slot, and the blade connecting section is adapted to be inserted into the push block slot for driving the blade motion.

In a possible design, the rope connecting section is provided with a screw hole passing through the rope groove;

The fastener is a fastening screw for threadedly coupling the screw hole to secure the drive rope within the rope groove.

In a possible design, the screw hole and the fastener are both set to two;

The joint of the drive rope is fastened between the two fasteners or both ends of the drive rope are fastened in the rope groove by two of the fasteners.

In one possible design, the rotating member is a motor.

In one possible design, the drive line is a wire.

In another aspect, a blade drive system is provided comprising a plurality of the above described blade drive mechanisms;

And, each of the blade drive mechanisms is configured to drive one of the blade motions.

In a possible design, a plurality of the blade drive mechanisms share one of the first support member and one blade case;

The blade box body is provided with a plurality of mutually parallel blade receiving grooves for accommodating a plurality of the blades.

In a possible design, the driving axle lengths of the plurality of blade driving mechanisms are different, and The cloth is in different vertical planes.

In a possible design, the first support member comprises: a bottom plate, a left side plate and a right side plate perpendicularly connected to both sides of the bottom plate;

The left side plate and the right side plate are respectively provided with a plurality of staggered mounting holes for mounting the wheel sleeve;

And the mounting hole on the left side plate is correspondingly connected to a part of the mounting hole on the right side plate;

The top of the right side plate is provided with a plurality of receiving slots, and the top of the left side plate is provided with a plurality of supporting slots, the mounting slots are arranged in one-to-one correspondence with the supporting slots, and each of the mounting slots is used for One of the first wheel supports is mounted for each of the support grooves for supporting the first wheel support in the corresponding seating groove.

The tops of the left side panel and the right side panel are each provided with a plurality of mounting slots, and the plurality of mounting slots at the top of the left side panel and the plurality of mounting slots at the top of the right side panel are offset from each other, and each of the mounting slots is used A first wheel support is mounted.

The beneficial effects brought by the technical solutions provided by the embodiments of the present invention are:

The blade driving mechanism provided by the embodiment of the invention applies the rotation of the rotating member to drive the rope transmission member to rotate. Since the steering member is coupled to the rope transmission member through the transmission rope, the rope transmission member transmits the driving force to the transmission rope to make it The linear motion moves and the steering rope forms a blade transmission section in the direction of motion of the blade through the steering member, that is, the blade transmission section linearly moves in the direction of motion of the blade. Since the push block is simultaneously connected to the blade drive section and the blade, the drive blade is moved in a desired direction. It can be seen that the blade driving mechanism provided by the embodiment of the present invention drives the blade motion through the cooperation of the rope transmission component, the transmission rope and the steering component, which can not only easily improve the movement speed of the blade, but also ensure the reliability and the motion of the blade. Control. Moreover, the blade driving mechanism provided by the embodiment of the invention has the advantages of simple structure, controllable production precision and long service life.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1-1 is a cross-sectional view of a blade driving mechanism according to an embodiment of the present invention;

1-2 is a perspective view of a blade driving mechanism according to an embodiment of the present invention;

2 is a cross-sectional view of a rope transmission member according to an embodiment of the present invention;

3 is a schematic view showing a connection relationship between a rotating member, a driving wheel shaft and a wheel sleeve according to an embodiment of the present invention;

4 is a schematic structural view of a driving axle provided by an embodiment of the present invention;

5 is a schematic view showing a connection relationship between a driving wheel axle, a wheel bushing, a guiding wheel, and a driving rope according to an embodiment of the present invention;

6-1 is a schematic structural diagram of a push block obtained from a first perspective according to an embodiment of the present invention;

FIG. 6-2 is a schematic structural diagram of a push block obtained from a second perspective according to an embodiment of the present disclosure;

7 is a schematic structural view of a blade driving system according to an embodiment of the present invention;

FIG. 8 is a schematic structural view of a first support member according to an embodiment of the present invention.

The reference numerals indicate:

1-rotating member;

2-rope transmission;

201-first support member;

201a- bottom plate; 201b-left side plate; 201c-right side plate; 201d-mounting hole; 201e-mounting groove;

201f-support groove;

202-drive axle; 2021-rope slot;

202a-small diameter section; 202b-large diameter section; 202b1-reverse thread groove; 202c-connection section;

203-axle sleeve; 2031-grooving;

204-guide wheel;

3-drive rope; 301-blade drive section;

4-steering member;

401-first transmission wheel; 402-second transmission wheel; 403-third transmission wheel; 404-second support member;

405-first wheel support; 406-second wheel support;

5-push block; 501-rope connecting section; 5011-rope groove; 502-blade connecting section; 503-fastener;

6-tightening screw;

7-fastening screw;

X-blade;

M-blade box.

Detailed ways

It should be noted that the terms “left and right, up and down, front and back” and the like in the embodiments of the present invention are defined by the orientation of FIG. 1-1, and are defined by their front, back, left, right, up, and down. It is merely for the convenience of describing the structure of the blade drive mechanism, and does not have any limitation.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

The embodiment of the present invention provides a blade driving mechanism, as shown in FIG. 1-1, the driving mechanism includes: a rotating member 1, a rope transmission member 2, a transmission rope 3, a steering member 4, and a push block 5;

Wherein the rope transmission member 2 is coupled to the rotating member 1;

The steering member 4 is coupled to the rope transmission member 2 via the transmission rope 3 for forming the transmission rope 3 to form the blade transmission section 301 in the direction of movement of the blade X;

The push block 5 is simultaneously connected to the blade drive section 301 and the blade X.

The blade driving mechanism provided by the embodiment of the present invention, when the rotating member 1 is rotated, drives the rope transmission member 2 to rotate. Since the steering member 4 is coupled to the rope transmission member 2 through the transmission rope 3, the rope transmission member 2 transmits the driving force. It is linearly moved to the drive rope 3, and the drive rope 3 is formed by the steering member 4 in the blade transmission section 301 in the direction of movement of the blade X, that is, the blade transmission section 301 linearly moves in the direction of movement of the blade X. Since the push block 5 is simultaneously connected to the blade drive section 301 and the blade X, its drive blade X is moved in a desired direction. It can be seen that the blade driving mechanism provided by the embodiment of the present invention drives the blade X movement by the cooperation of the rope transmission member 2, the transmission rope 3, and the steering member 4, which can not only easily improve the movement speed of the blade X, but also ensure the blade X. The reliability and controllability of sports. Moreover, the blade drive mechanism provided by the embodiment of the invention is simple in structure, controllable in production precision, and long in service life.

The various components of the blade drive mechanism and the functions thereof provided by the embodiments of the present invention are respectively described below:

In the embodiment of the present invention, the rotating member 1 is used to provide the driving force. Considering the motor as a common rotating driving device, the rotating member 1 has the advantages of automatic rotation, controllable rotation speed, high precision, and the like. The motor, of course, does not exclude the fact that the rotating member 1 is manually rotated.

For the rope drive 2, it can convert the driving force of the rotating member 1 into a linear motion of the driving rope 3, and those skilled in the art can understand that the rope transmission is a rope and a sheave which are tightly wound around the sheave. The friction between the two transmits the mechanical transmission of power and motion. Based on the rope transmission 2 for multi-leaf collimation The blades of the device are driven, and the steel wire is used as the transmission rope 3 to realize stable and controllable movement of the blade.

An example of the structure of the rope drive 2 is given below:

As shown in FIGS. 1-2 and 2, the rope transmission member 2 includes: a first support member 201, a drive axle 202;

The driving axle 202 is fixed on the first support member 201, and the driving axle 202 is coupled to the rotating shaft of the rotating member 1;

A rope groove 2021 is disposed on the outer surface of the drive axle 202, and the drive rope 3 is coupled to the steering member 4 after the rope groove 2021.

In application, the rotating shaft of the rotating member 1 drives the driving axle 202 to rotate. Based on the frictional force of the driving rope 3 and the rope groove 2021, the rotation of the driving axle 202 can be converted into a linear motion of the driving rope 3, and the linearly driven transmission rope 3 passes through The rope groove 2021 is coupled to the steering member 4 to change its linear motion direction to the direction of movement of the blade X.

Specifically, the rope support 2 is stably supported by providing the first support member 201. Considering that the object applied by the blade drive mechanism is a multi-leaf collimator, the blade X generally moves along its longitudinal direction, the first support The piece 201 may be arranged in a plate shape, and the blade X moves in a direction perpendicular to the plate surface of the first support member 201 (see Figs. 1-2).

It can be understood that the structure of the rope groove 2021 is adapted to the structure of the drive rope 3, and as long as the rope groove 2021 is ensured to rotate with the drive axle 202, it can generate a frictional force with the drive rope 3 sufficient to linearly move the drive rope 3 can.

Further, as shown in FIGS. 1-2 and 2, the rope transmission member 2 further includes: a wheel sleeve 203;

The wheel sleeve 203 is fixed on the first support member 201, and is connected to the outer casing of the rotating member 1, as shown in Figure 3, the wheel sleeve 203 is provided with a slot 2031 communicating with the inner cavity;

The driving axle 202 is coupled to the rotating shaft of the rotating member 1 and rotatably sleeved in the axle sleeve 203;

The rope groove 2021 is disposed on an outer surface of the opposite portion of the driving axle 202 and the slot 2031;

The drive rope 3 is coupled to the steering member 4 through the slot 2031 after the rope groove 2021.

By providing the hub sleeve 203 on the first support member 201, not only the mounting of the rotating member 1 but also the driving axle 202 can be protected. The drive axle 202 moves within the axle sleeve 203, and the top wall of the axle sleeve 203 is provided with a slot 2031 for allowing the drive cable 3 to pass through.

For the mounting manner of the wheel sleeve 203, as shown in FIG. 2, a through hole corresponding to the first support member 201 can be opened, and the wheel sleeve 203 can be transversely passed through and fixed in the through hole. Meanwhile, as shown in FIG. 3, the wheel hub 203 is disposed at one end of the right side of the first support member 201 with a first ear plate, and A second ear plate corresponding to the first ear plate is disposed on the outer casing of the rotating member 1, and the connection between the wheel bushing 203 and the rotating member 1 can be realized by bolting the first ear plate with the second ear plate.

The sleeve 203 is located on the top wall of the sleeve body on the left side of the first support member 201, and defines a slot 2031. The slot 2031 has a lateral length corresponding to the length of the slot 2021 in the lateral direction, and can be designed as a bad arc along the circumferential direction. structure.

Since the driving force of the driving rope 3 is mainly maintained by the frictional force generated at the driving rope 3 and the rope groove 2021 wound on the driving axle 202, in order to ensure that the frictional force can provide sufficient driving force, the embodiment of the present invention The structure of the rope transmission member 2 is defined as follows:

As shown in FIG. 4, the driving axle 202 includes: a small diameter section 202a, a large diameter section 202b, and a connecting section 202c which are sequentially connected;

Wherein, the rope groove 2021 is arranged in a multi-turn thread groove structure on the small diameter section 202a;

The large diameter section 202b is provided with a reverse thread groove 202b1, and the reverse thread groove 202b1 has the same pitch as the rope groove 2021, and the rotation direction is opposite;

The large diameter section 202b is screwed to the axle sleeve 203;

The connecting section 202c is coupled to the rotating shaft of the rotating member 1.

By providing the rope groove 2021 on the small diameter section 202a in a multi-turn thread groove structure, the transmission rope 3 is wound thereon in a plurality of turns which do not affect each other, so that the friction generated at the transmission rope 3 and the rope groove 2021 can be remarkably improved. force. For stable and controllable transmission, the rope groove 2021 can be designed to be 2-5 turns, for example 2 turns, 3 turns, 4 turns, 5 turns.

In order to prevent the drive rope 3 from reciprocating in the rope groove 2021, the reverse thread groove 202b1 is provided on the large diameter section 202b, and the reverse thread groove 202b1 has the same pitch as the rope groove 2021. The rotation is reversed, and the reverse thread groove 202b1 is screwed to the wheel sleeve 203 (ie, the inner wall of the wheel sleeve 203 is provided with an internal thread corresponding to the reverse thread groove 202b1). In this way, when the drive axle 202 rotates, since it is also screwed to the axle sleeve 203, the drive axle 202 also moves along its axial direction. Since the reverse thread groove 202b1 and the rope groove 2021 have the same pitch and the opposite directions, the drive is driven. The axial movement of the axle 202 can counteract the axial movement of the drive cable 3 within the rope groove 2021, ultimately ensuring that the position of the drive rope 3 does not move or change, such that when the drive cable 3 reciprocates within the rope groove 2021 There is a disorder.

The connecting portion 202c is connected to the rotating shaft of the rotating member 1, and the two can be directly connected or connected by a coupling. When the two are directly connected, as shown in FIG. 4, a wire can be arranged on the end surface of the connecting portion 202c. a slot, and a plug adapted to the slot is provided on the end surface of the rotating shaft of the rotating member 1 The plug adapter can be inserted into the slot.

It can be seen from the above that the transmission rope 3 moves in the vertical direction after the rope groove 2021. In order to ensure the linear motion of the transmission rope 3 is stable and reliable, as shown in FIG. 5, the embodiment of the present invention provides two guides in the slot 2031. The wheel 204 is for guiding the drive rope 3 passing through the slot 2031.

The drive rope 3 is guided by both the take-up and the introduction by the guide wheel 204, ensuring that the drive rope 3 moves in the vertical direction after the guide wheel 204, and when the plurality of blade drive mechanisms are used together, the guide wheel 204 can also be provided. Make sure that the drive of the drive cable 3 does not affect the position of adjacent blades.

For the setting of the guide wheel 204, an example is given below:

Two fixed shafts may be disposed in the slot 2031 in a direction perpendicular to the axial direction of the axle sleeve 203 (the two ends of the fixed shaft are fixed in the left and right side walls of the slot 2031), and a fixed shaft is disposed on each of the fixed shafts. The rotating guide wheel 204 is provided with a ring-shaped annular groove on the surface thereof in the circumferential direction, and the ring groove on one of the guide wheels 204 is bypassed by pulling and introducing the drive cable 3 on the drive wheel shaft 202, respectively.

In the embodiment of the present invention, the linear movement direction of the drive rope 3 is changed by the steering member 4, and finally the direction of movement of the blade transmission section 301 thereon is made to coincide with the movement direction of the blade X. An example of the structure of the steering member 4 is given below:

As shown in FIG. 1-1 and FIG. 1-2, the steering member 4 includes: a first transmission wheel 401, a second transmission wheel 402, a third transmission wheel 403, and a second support member 404;

The first transmission wheel 401 and the third transmission wheel 403 are disposed at upper ends of the first support member 201 at intervals by the first wheel support 405;

The right end of the second support member 404 is disposed on the top of the first wheel support 405, and the left end is disposed on the top of the blade housing M;

The second transmission wheel 402 is disposed at the left portion of the second support member 404 through the second wheel support 406;

The drive rope 3 sequentially bypasses the first transmission wheel 401, the second transmission wheel 402, and the third transmission wheel 403, and the rope body of the transmission rope 3 between the second transmission wheel 402 and the third transmission wheel 403 serves as the blade transmission section 301. .

The working principle of the steering member 4 is illustrated by the rightward movement of the blade X. After the driving rope 3 is driven by the rope driving member 2, it is taken out by the slot 2031 (and can also be guided through the guiding wheel 204), that is, the transmission The transmission direction of the rope 3 is sequentially changed to the left direction by the first transmission wheel 401, and then changed to the right direction by the second transmission wheel 402, and then changed to the downward movement by the third transmission wheel 403. Until the drive rope 3 is introduced into the rope groove 2021 of the rope drive member 2 by the slot 2031.

It can be seen from the above that the drive rope 3 is located between the second transmission wheel 402 and the third transmission wheel 403. As the blade transmission section 301, the rope body can move the blade X to the right by arranging the push block 5 on the blade transmission section 301.

Wherein, as shown in FIG. 1-1, the first transmission wheel 401 is disposed above the third transmission wheel 403 to ensure that different transmission direction segments of the transmission rope 3 do not affect each other. For the same purpose, the first transmission wheel 401 and the third transmission wheel 403 are not in the same vertical plane in the vertical direction, with a certain interval therebetween.

It can be understood that, in order to ensure that the transmission direction of the blade transmission section 301 is in the lateral direction, the top rope grooves of the first transmission wheel 401 and the second transmission wheel 402 are on the same horizontal plane, the top rope groove of the third rotation wheel 403 and the second transmission The bottom rope groove of the wheel 402 is also on the same level.

The first wheel support 405 is used to fix the first transmission wheel 401 and the third transmission wheel 403 at the upper end of the first support member 201, and the second wheel support 406 is used to fix the second transmission wheel 402 to the second support member. At the left end of the 404, both wheel supports are used to limit the support of the transmission wheel without affecting the rotation of each transmission wheel. For example, each wheel support may include opposite front side panels and rear side panels, and the central axes of the respective transmission wheels are fixed between the front side panels and the rear side panels, so that the rotating wheels are rotatably fitted to the respective ones. On the center axis, you can rotate around it.

In order to facilitate the adjustment of the position of each wheel support or to replace it, the first wheel support 405 can be fixed to the upper end of the first support member 201 by the fastening screw, and the second wheel support 406 can be fixed to the second support member. The left end of the 404.

As mentioned above, the driving force of the driving rope 3 is mainly maintained by the frictional force generated at the driving rope 3 and the rope groove 2021 wound around the driving wheel shaft 202, and the number of windings of the driving rope 3 on the rope groove 2021 is determined. After that, how to adjust the above frictional force is also very important for the transmission process of the transmission rope 3. In order to solve the technical problem, as shown in FIG. 1-1 and FIG. 1-2, the driving mechanism provided by the embodiment of the present invention further includes: an elastic screw 6; the elastic screw 6 is threadedly connected through the first supporting member. The top end of 201 is then abutted against the second support member 404 to drive the second support member 404 to move in the direction of movement of the blade X (i.e., to move in the left and right direction).

The length of the second support member 404 is driven to move left and right by loosening or tightening the elastic screw 6 to adjust the length of the second support member 404. Since the second support member 404 and the second transmission wheel 402 are relatively fixed, When the second support member 404 moves to the left and right, the second transmission wheel 402 can be moved to the left and right to adjust the distance between the second transmission wheel 402 and the first transmission wheel 401 and the third transmission wheel 403, thereby adjusting the transmission rope 3 The tension is even if the frictional force generated at the drive rope 3 and the rope groove 2021 is adjustable.

It can be seen from the above that the second support member 404 is required to move left and right, but when the drive mechanism is applied, The position of the second support member 404 is stable. Based on this, the embodiment of the present invention provides a limit slot on the top of the first wheel support 405, and the right end of the second support member 404 is embedded in the limit slot;

As shown in FIG. 1-1 and FIG. 1-2, a strip-shaped through hole is disposed at a left end of the second support member 404;

The drive mechanism further includes a fastening screw 7 for threading the top of the blade housing M after passing through the strip through hole.

By inserting the right end of the second support member 404 into the limit groove at the top of the first wheel support 405, it can be moved left and right along the limit groove. By providing a strip-shaped through hole at the left end of the second support member 404, after the second support member 404 is moved to the left and right, the strip-shaped through hole can still be opposed to the threaded hole at the top of the blade box M, at this time, by fastening After the screw 7 passes through the strip through hole and is screwed to the top of the blade case M, the left end of the second support member 404 can be fixed to the top of the blade case M.

Wherein, the length of the strip-shaped through hole may be 2-5 times of the diameter of the threaded hole at the top of the blade box M, so that the moving distance of the second support member 404 is adjustable. In addition, regarding the limiting slot at the top of the first wheel support 405, its presence does not have any influence on the operation of each of the transmission wheels, and is only used to support the right end portion of the second support member 404 while the second support member 404 is provided. The right end of the right side can be moved along its left and right.

For example, when the first wheel support 405 includes a front side panel and a rear side panel, a support panel may be disposed at an upper portion between the front side panel and the rear side panel, the support panel, the upper side of the front side panel, and the rear panel The upper portion of the side plate cooperates to form a through groove which is open in the left-right direction and upward, and the through groove can serve as a limiting groove.

Alternatively, when the top of the first wheel support 405 is closed, the limit groove can be obtained by opening an upwardly open through groove in the left and right direction at the top of the first wheel support 405. It can be understood that the width of the limiting slot is adapted to the width of the right end of the second support member 404 for stable support thereof.

The blade housing M is a component of a multi-leaf collimator system that, in the embodiment of the invention, is used not only to accommodate the blades, but also to support the second support member 404. It can be understood that the left end of the second support member 404 can be separately designed as a stepped ear plate, so that it can realize the left and right movement along the top of the blade box M without affecting the left and right sides of the blade X in the blade box M. motion.

The embodiment of the present invention uses the push block 5 to form a coupling between the drive rope 3 and the blade X. As an example, as shown in FIG. 6-1 and FIG. 6-2, the push block 5 includes: a rope connecting segment. 501, a blade connecting section 502 connected to the lower end of the rope connecting section 501;

The rope connecting section 501 is provided with a downwardly extending rope groove 5011 in the moving direction of the blade X (ie, in the left-right direction) for accommodating the driving rope 3;

The rope connecting section 501 is further provided with a fastener 503 for fixing the driving rope 3 in the rope receiving groove 5011;

The blade connecting section 502 is for connection with the blade X.

By providing a rope groove 5011 on the rope connecting section 501 so as to accommodate the driving rope 3 therein, a fastener 503 is provided to fix the driving rope 3 located in the rope groove 5011 therein, thus, the driving rope 3 When moving, the blade connecting section 502 of the push block 5 can drive the blade X to move.

The fastener 503 can be a screw member, a bolt member, a cementing member, and a snap member. In view of the connection fastening and the ease of disassembly, the embodiment of the present invention can employ a screw member. At this time, as shown in FIG. 6-1 and FIG. 6-2, the rope connecting section 501 is provided with a screw hole passing through the rope groove 5011; the fastener 503 is a fastening screw for threading the screw hole. Connected to secure the drive cable 3 within the rope groove 5011.

When the fastener 503, that is, the fastening screw passes through the screw hole, when the transmission rope 3 passes through the rope groove 5011 at the same time, since the screw hole passes through the rope groove 5011, at this time, the transmission rope 3 will be located at the fastening screw. In the specific thread groove, at this time, the drive rope 3 is fixed in the rope groove 5011 by screwing the fastening screw to the screw hole.

It can be understood that the above screw hole includes a front half section disposed on the front side wall of the rope groove 5011 and a rear half section disposed on the rear side wall of the rope groove 5011, that is, the screw hole passes through the rope groove 5011.

It can be understood that the drive rope 3 can be obtained by docking the two ends of the rope body of a predetermined length, and the joint must form a joint. In order to prevent the joint from participating in the movement of the respective transmission wheel and the drive axle 202, the joint or the transmission can be driven. Both ends of the cord 3 are disposed in the rope groove 5011 and fastened by a fastener 503. As an example, both the screw hole and the fastener 503 are provided in two; the joint of the drive rope 3 is fastened between the two fasteners 503, or both ends of the drive rope 3 are secured by two fasteners 503 Fastened in the rope groove 5011.

Based on the above, the blade connecting section 502 is used to drive the blade X to move in the left-right direction. On the basis of realizing the function, in order to facilitate the disassembly between the two, the two can be connected by a detachable connection. For example, a push block can be provided on the top of the blade X, and the blade connecting section 502 is adapted to be inserted into the push block slot for driving the blade X to move, so that when the blade connecting section 502 moves left and right Then, the blade X can be pushed to the left and right, and when it is necessary to disassemble, the blade connecting section 502 can be simply pulled up.

In summary, based on the blade driving mechanism provided by the embodiment of the present invention, the moving speed of the blade X can be expressed as follows:

Where d is the median diameter of the rope groove, and n is the rotational speed of the drive axle 202;

For example, when d=5mm, V should reach the speed requirement of 20mm/s. At this time, n=76.4r/min, that is, the required movement of the blade X can be achieved when the rotational speed of the driving axle 202 is 77r/min. speed.

Compared with the existing screw nut drive mechanism, the corresponding speed of the blade X can be expressed as follows:

Where p is the pitch of the screw and n is the screw speed;

When V is to reach the speed requirement of 20mm/s, then n=2400r/min, that is, the screw rotation speed needs to reach 2400r/min to reach the speed required by the blade X.

It can be seen that the driving mechanism provided by the embodiment of the invention makes it easier for the blade X to reach the required speed requirement and reduces the vibration and noise caused by the high speed. At the same time, the transmission of the drive rope 3 (steel wire) can adopt a larger transmission ratio between the rotary member 1 (motor) and the drive axle 202, thereby providing a larger driving force, and it is easier to ensure reliable movement of the blade X. In addition, since the transmission between the drive rope 3 and the drive axle 2 is relatively large, when the blade X is in the vertical state, it is easier to maintain the balance of the blade X than with the screw nut drive. When the screw nut transmission adopts the multi-head thread, since the screw has no self-locking ability, the blade X is easy to generate self-movement under the self-weight condition, and the control program is added to overcome the control circuit, which increases the operation difficulty.

In addition, the blade driving mechanism provided by the embodiment of the invention has the advantages of simple structure, simple manufacture, and long service life based on the steel wire transmission, which can significantly improve the processing precision and effectively reduce the manufacturing cost.

Further, since the blade driving mechanism provided by the embodiment of the present invention can significantly improve the reliability and the moving speed of the blade X when moving, this makes the blade X have a smaller width (also understood as being thinner). Multiple adjacent blades X provide a stable and reliable transmission.

When the blade driving mechanism provided by the embodiment of the present invention is used in a multi-leaf collimator, since the multi-leaf collimator has a plurality of blades X, a plurality of blade driving mechanisms can be used at this time, and based on this, the embodiment of the present invention further provides A blade drive system, as shown in Figure 7, includes any of the blade drive mechanisms described above; and each blade drive mechanism is configured to drive a blade X motion.

In application, each blade drive mechanism operates independently and does not affect each other, and drives the respective blades X, respectively, so that the motion of the plurality of blades X reaches a desired conformal accuracy.

In order to simplify the structure of the blade drive system, in the embodiment of the present invention, as shown in Figure 7, a plurality of blade drive mechanisms share a first support member 201 and a blade housing M;

A plurality of mutually parallel vane receiving grooves are provided in the vane casing M for accommodating the plurality of vanes X.

By providing a first support member 201, the rope drive member 2 of the plurality of blade drive mechanisms and the first drive wheel 401 and the third drive wheel 403 are simultaneously provided with support, which not only facilitates simplification of the structure of the blade drive system, but also facilitates The plurality of rope drive members 2 are spaced or staggered to avoid affecting each other, avoiding transmission interference problems of the blades X from the source.

Wherein, a plurality of blades X are simultaneously placed by one blade casing M, and a plurality of mutually parallel blade receiving grooves are arranged in the blade casing M, and each blade receiving groove has a blade X therein, which are independent of each other and do not affect each other. . Specifically, a plurality of parallel blind grooves are disposed on the bottom wall of the blade box M in a lateral direction for accommodating the lower end of the blade X and moving the blade X along the lateral direction thereof (ie, left and right movement); in the blade housing M A plurality of parallel through grooves are provided in the top wall in the lateral direction for passing the upper end of the blade X and allowing the blade X to move laterally therethrough. Further, the top end wall of the left end of the blade case M extends upward to form an upper step for connection with the left end of the second support member 404 (see Fig. 7).

When the blade drive system is used for driving a plurality of blades X adjacent to each other, in order to avoid transmission interference between adjacent blades X, on the one hand, the drive axles 202 of the plurality of blade drive mechanisms may be different in length, on the other hand The plurality of drive axles 202 can be distributed in different vertical planes, i.e., at least a portion of the drive axle 202 is distributed in a different vertical plane than the other drive axles 202 (an embodiment of Figure 7 is shown) . With this arrangement, the plurality of rope transmission members 2 can be staggered and spatially staggered from each other, thereby effectively preventing transmission interference between adjacent blades X.

When the blade drive system is a first support member 201, in order to realize different lengths of the plurality of drive axles 202 and distributed in different vertical planes, at this time, the first support member 201 may be configured as a box structure, such as As shown in Figure 8, the first support member 201 includes a bottom plate 201a, a left side plate 201b and a right side plate 201c perpendicularly connected to both sides of the bottom plate 201a;

The left side plate 201b and the right side plate 201c are respectively provided with a plurality of staggered mounting holes 201d for mounting the wheel sleeve 203;

The mounting hole 201d on the left side plate 201b is in communication with the partial mounting hole 201d on the right side plate 201c.

Here, for the plurality of mounting holes 201d located on the same side plate, they are staggered in the up-and-down direction and the front-rear direction to avoid transmission interference between adjacent blades X.

By correspondingly connecting the mounting hole 201d on the left side plate 201b with the partial mounting hole 201d on the right side plate 201c, the wheel bushing 203 is simultaneously passed through and fixed on the left side plate 201b and the right side plate 201c, so that the first A support member 201 can be adapted for drive axles 202 of different lengths.

For example, when four drive axles 202 are used and the lengths of the two are the same, as shown in FIG. 8, two staggered mounting holes 201d are provided on the left side plate 201b, and four are disposed on the right side plate 201c. A staggered mounting hole 201d, wherein two of the four are in communication with the two mounting holes 201d on the left side plate 201b. So that the two axle sleeves 203 can only pass laterally through the mounting holes 201d on the right side plate 201c, so that the rope grooves 2021 on the two drive axles 202 are located between the left side plate 201b and the right side plate 201c, and The other two axle sleeves 203 are simultaneously transversely passed through the mounting holes 201d on the left side plate 201b and the right side plate 201c such that the rope grooves 2021 on the other two drive wheel shafts 202 are located on the left side of the left side plate 201b.

Considering that the tension of the drive rope 3 can be adjusted separately for different blade drive mechanisms, at this time, different first wheel supports 405 must be provided for different blade drive mechanisms, as shown in FIG. In the embodiment of the present invention, a plurality of mounting slots 201e are disposed at the top of the right side plate 201c. Correspondingly, a plurality of supporting slots 201f are disposed at the top of the left side panel 201b, and the mounting slots 201e are disposed in one-to-one correspondence with the supporting slots 201f. Each of the seating slots 201e is for mounting a first wheel support 405. The right end of the first wheel support 405 is mounted in the mounting groove 201e, the left end passes through the support groove 201f, and the support groove 201f is opposite to the left end of the first wheel support 405. Supporting is performed such that a plurality of first wheel supports 405 are mounted, and a second support member 404 is embedded in the limiting groove at the top of each of the first wheel supports 405.

In addition, in consideration of the need to provide the elastic screws 6 at the top of the first support member 201 to facilitate the adjustment of the tension of the plurality of transmission ropes 3, a plate body may be disposed on the top of the right side plate 201c, and the upper and lower sides of the plate body are provided A plurality of screw holes are disposed in the direction such that the plurality of elastic screws 6 pass through and abut against the corresponding second support members 404. At this time, the seating groove 201e on the left side plate 201b may be disposed as a left and right through groove having an upward opening, and the top of the mounting groove 201e on the right side plate 201c is blocked by the above-mentioned plate body, and it is only the left and right through grooves. Without an upward opening.

In order to prevent the plurality of first wheel supports 405 from affecting each other, the embodiment of the present invention is provided with a plurality of seating slots 201e at the top of the left side plate 201b and the right side plate 201c, and a plurality of the left side plates 201b The mounting slots 201e and the plurality of mounting slots 201e on the right side plate 201c are offset from each other, and each of the mounting slots 201e is configured to mount a first wheel support 405, so that the plurality of first wheel supports 405 do not affect each other. A second support member 404 is embedded in the limit groove at the top of each of the first wheel supports 405.

It can be understood that the plurality of seating grooves 201e on the left side plate 201b and the plurality of seating grooves 201e on the right side plate 201c are offset from each other in the direction in which the mounting grooves 201e are arranged, for example, from front to back. The first, third, fifth, and seventh seating grooves 201e may be disposed on the left side plate 201b, and the second, fourth, sixth, and eighth seating grooves 201e may be disposed on the right side plate 201c.

In addition, in consideration of the need to provide the elastic screws 6 at the top of the first support member 201, it is convenient to adjust the tension of the plurality of transmission ropes 3, and the plate body is disposed at the top of the left side plate 201b and the right side plate 201c, the plate A plurality of screw holes are disposed in the front and rear direction of the body such that the plurality of elastic screws 6 pass through and abut against the corresponding second support members 404. At this time, the tops of the seating grooves 201e on the left side plate 201b and the right side plate 201c are closed by the above-mentioned plate body, and they are only the left and right through grooves, and do not have an upward opening.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

A blade driving mechanism, characterized in that the driving mechanism comprises: a rotating member (1);

a rope drive member (2) coupled to the rotating member (1);

a steering member (4) coupled to the rope transmission member (2) by a transmission rope (3) for causing the transmission rope (3) to form a blade transmission section (301) in a moving direction of the blade (X);

A push block (5) that is simultaneously connected to the blade drive section (301) and the blade (X).
The blade drive mechanism according to claim 1, wherein the rope drive member (2) comprises: a first support member (201), a drive axle (202);

The driving axle (202) is fixed on the first supporting member (201), and the driving axle (202) is coupled to the rotating shaft of the rotating member (1);

A rope groove (2021) is disposed on an outer surface of the drive axle (202), and the drive rope (3) is coupled to the steering member (4) after the rope groove (2021).
The blade drive mechanism according to claim 2, wherein the rope drive member (2) further comprises: a wheel sleeve (203);

The wheel sleeve (203) is fixed on the first support member (201) and connected to the outer casing of the rotating member (1), and the wheel sleeve sleeve (203) is provided with a slot communicating with the inner cavity. (2031);

The driving axle (202) is rotatably sleeved in the wheel sleeve (203);

The rope groove (2021) is disposed on an outer surface of an opposite portion of the driving wheel shaft (202) and the groove (2031);

The drive rope (3) is coupled to the steering member (4) through the slot (2031) around the rope groove (2021).
The blade drive mechanism according to claim 3, wherein the drive axle (202) comprises: a small diameter segment (202a), a large diameter segment (202b), and a connecting segment (202c) that are sequentially connected;

The rope groove (2021) is disposed in the small diameter section (202a) in a multi-turn thread groove structure;

The large diameter section (202b) is provided with a reverse thread groove (202b1), and the reverse thread groove (202b1) has the same pitch as the rope groove (2021), and the rotation direction is opposite;

The large diameter section (202b) is screwed to the wheel sleeve (203);

The connecting section (202c) is coupled to the rotating shaft of the rotating member (1).
The blade drive mechanism according to claim 3, wherein the slot (2031) is provided with two guide wheels (204) for the drive line passing through the slot (2031) (3) Conducting guidance.
The blade drive mechanism according to claim 3, wherein the steering member (4) comprises: a first transmission wheel (401), a second transmission wheel (402), a third transmission wheel (403), and a second Support member (404);

The first transmission wheel (401) and the third transmission wheel (403) are disposed above and below the upper end of the first support member (201) by a first wheel support (405);

The second end of the second support member (404) is disposed at the top of the first wheel support (405), and the left end is disposed at the top of the blade housing (M);

The second transmission wheel (402) is disposed at a left portion of the second support member (404) through a second wheel support (406);

The drive rope (3) sequentially bypasses the first transmission wheel (401), the second transmission wheel (402), the third transmission wheel (403), and the transmission rope (3) is located at the A rope body between the second transmission wheel (402) and the third transmission wheel (403) is used as the blade transmission section (301).
The blade drive mechanism according to claim 6, wherein the drive mechanism further comprises: a tightening screw (6);

The elastic screw (6) is threadedly connected to the top end of the first support member (201) to abut against the second support member (404) to drive the second support member (404) along the The blade (X) moves in the direction of motion.
The driving mechanism according to claim 7, wherein a top end of the first wheel support (405) is provided with a limit groove, and a right end of the second support member (404) is embedded in the limit groove;

a left through end of the second support member (404) is provided with a strip through hole;

The drive mechanism further includes a fastening screw (7) for threading the top of the blade housing (M) after passing through the strip through hole.
The driving mechanism according to claim 1, wherein the push block (5) comprises: a rope connecting section (501), and a blade connecting section (502) connected to a lower end of the rope connecting section (501);

The rope connecting section (501) is provided with an open downward rope groove (5011) along the moving direction of the blade (X) for accommodating the driving rope (3);

The rope connecting section (501) is further provided with a fastener (503) for fixing the driving rope (3) in the rope groove (5011);

The blade connecting section (502) is for connection with the blade (X).
The driving mechanism according to claim 9, wherein the top of the blade (X) is provided with a push block slot, and the blade connecting portion (502) is adapted to be inserted into the push block slot. Driving the blade (X) to move.
The driving mechanism according to claim 9, wherein the rope connecting section (501) is provided with a screw hole passing through the rope groove (5011);

The fastener (503) is a fastening screw for screwing with the screw hole to fix the drive rope (3) in the rope groove (5011).
The driving mechanism according to claim 11, wherein the screw hole and the fastener (503) are both disposed in two;

The joint of the drive rope (3) is fastened between two of the fasteners (503) or both ends of the drive rope (3) are fastened by two of the fasteners (503) Inside the rope groove (5011).
Drive mechanism according to any of the claims 1 - 12, characterized in that the rotating member (1) is a motor.
Drive mechanism according to any of the claims 1 - 12, characterized in that the drive rope (3) is a steel wire.
A blade drive system comprising the plurality of blade drive mechanisms of any of claims 1-14;

And, each of the blade drive mechanisms is configured to drive one of the blades (X) to move.
The blade drive system according to claim 15, wherein a plurality of said blade drive mechanisms share one of said first support member (201) and a blade housing (M);

A plurality of mutually parallel vane receiving grooves are provided in the vane casing (M) for accommodating a plurality of the vanes (X).
A blade drive system according to claim 16 wherein the drive axles (202) of the plurality of blade drive mechanisms are of different lengths and are distributed in different vertical planes.
The blade drive system according to any one of claims 16-17, wherein the first support member (201) comprises: a bottom plate (201a), and a left side plate vertically connected to both sides of the bottom plate (201a) ( 201b) and right side plate (201c);

The left side plate (201b) and the right side plate (201c) are respectively provided with a plurality of staggered mounting holes (201d) for mounting the wheel bushing (203);

Moreover, the mounting hole (201d) on the left side plate (201b) is in communication with a part of the mounting hole (201d) on the right side plate (201c).
The blade drive system according to claim 18, wherein a top portion of the right side plate (201c) is provided with a plurality of seating grooves (201e), and a top portion of the left side plate (201b) is provided with a plurality of supports a slot (201f), the mounting slot (201e) is disposed in one-to-one correspondence with the support slot (201f), and each of the mounting slots (201e) is configured to mount one of the first wheel supports (405), each The support groove (201f) is for supporting the first wheel support (405) in the corresponding seating groove (201e).
The blade drive system according to claim 18, wherein the tops of the left side plate (201b) and the right side plate (201c) are each provided with a plurality of seating grooves (201e), the top of the left side plate A plurality of seating grooves (201e) and a plurality of seating grooves (201e) at the top of the right side plate are offset from each other, and each of the seating grooves (201e) is for mounting one of the first wheel supports (405).