CN213252658U - Displacement detection device of multi-leaf grating blade - Google Patents
Displacement detection device of multi-leaf grating blade Download PDFInfo
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- CN213252658U CN213252658U CN202021868837.5U CN202021868837U CN213252658U CN 213252658 U CN213252658 U CN 213252658U CN 202021868837 U CN202021868837 U CN 202021868837U CN 213252658 U CN213252658 U CN 213252658U
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Abstract
The utility model discloses a displacement detection device of leafy grating blade, including setting up casing on the blade leading truck, setting up resistance strain foil group in the casing and by a plurality of leafy grating blades drive and gliding electrically conductive mechanism on the resistance strain foil group. The utility model discloses a set up resistance strain gauge group, the multi-leaf grating blade drives conductive mechanism and slides on the resistance strain gauge group, makes the displacement information of multi-leaf grating blade convert voltage signal and supply the computer to gather, reaches the purpose of direct detection multi-leaf grating blade displacement, and the accuracy of detection is higher, and the testing result is more directly perceived; through setting up resistance strain foil group and electrically conductive mechanism in the casing, make whole device structure compacter, the standard device size of being convenient for satisfies the demand of installing in a narrow and small space, and the installation is effectual.
Description
Technical Field
The utility model belongs to the technical field of medical equipment, concretely relates to displacement detection device of leafy grating blade.
Background
The multi-leaf grating is a core enabling component in the radiotherapy equipment and mainly plays a role in conforming and strengthening X-rays so as to kill tumor cells to the maximum extent and protect surrounding normal tissues. The multi-blade grating comprises a plurality of tungsten alloy blades which are arranged, and each blade is connected with a corresponding driving mechanism, a transmission mechanism, a position sensor and a driving control system and can move independently. Specifically, the drive control system controls the drive mechanism and pushes the tungsten alloy blade to move to a specified position through the transmission mechanism; the tungsten alloy blades can form a specific shape which is similar to the shape of a target area of a tumor of a patient, so that the purposes of conforming to and strengthening X-rays are achieved. In the existing equipment, the driving mechanism for providing power for each blade of the multi-blade grating mainly comprises three types, namely a rotary motor, a cylinder and a linear motor. Because linear electric motor compares cylinder positioning accuracy height, compares that rotating electrical machines moves velocity height, acceleration is big, consequently receives industry more and more attention.
At present, a method for indirectly detecting the driving information of a driving motor is mostly adopted to obtain the displacement information of the multi-leaf grating, and the detection precision of a motor displacement detection element (such as a rotary encoder and a Hall sensor) is not high, so that the displacement information of the multi-leaf grating is not accurately acquired, the motion precision of a leaf is reduced, the use requirement of the multi-leaf grating cannot be met, and the treatment time of a patient is correspondingly prolonged. Meanwhile, due to the development requirement of miniaturization of the existing radiotherapy equipment, the multi-leaf grating blade and the motor driving mechanism, the transmission mechanism and the displacement detection mechanism thereof need to be installed in a narrow space, and the size of the device is greatly limited. Therefore, it is necessary to design and manufacture a detecting device which has a compact structure and can accurately and directly detect the displacement of the leaf of the multi-leaf collimator so as to ensure the position detection precision of the leaf of the multi-leaf collimator, and thus, the motion precision of the leaf of the multi-leaf collimator can be better ensured.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that not enough among the above-mentioned prior art is directed against, provide a displacement detection device of multi-leaf grating blade, its simple structure, through setting up resistance strain foil group, multi-leaf grating blade drives electrically conductive mechanism and slides on the resistance strain foil group, makes the displacement information of multi-leaf grating blade turn into voltage signal and supply the computer to gather, reaches the purpose of direct detection multi-leaf grating blade displacement, and the accuracy of detection is higher, and the testing result is more directly perceived.
In order to solve the technical problem, the utility model discloses a technical scheme is: a displacement detection device of a multi-leaf grating blade is characterized in that: the device comprises a shell arranged on a blade guide frame, a resistance strain gauge group arranged in the shell, and a conductive mechanism driven by a plurality of multi-leaf grating blades and sliding on the resistance strain gauge group.
The displacement detection device for the multi-leaf grating blade is characterized in that: the conducting mechanism comprises a plurality of electric brushes which are in sliding fit with the resistance strain gauge groups and a plurality of sliding blocks which are used for connecting the electric brushes and the multi-leaf collimator blades, the number of the electric brushes and the number of the sliding blocks are the same and are in one-to-one correspondence, one end of each sliding block, which is far away from the corresponding electric brush, penetrates through the shell and is fixedly connected with the corresponding blade, and a guide groove is formed in the position, matched with the corresponding sliding block, of.
The displacement detection device for the multi-leaf grating blade is characterized in that: the resistance strain gauge group comprises a plurality of resistance strain gauges transversely arranged on the top surface inside the shell in sequence, and the number of the resistance strain gauges is the same as that of the electric brushes and corresponds to that of the electric brushes one by one.
The displacement detection device for the multi-leaf grating blade is characterized in that: be provided with a plurality of response chambeies in the casing, adjacent two be provided with the baffle that is used for cutting apart the casing between the response chamber, resistance foil gage group includes a plurality of resistance foil gage units, resistance foil gage unit sets up the response intracavity and will the response chamber is cut apart into two half response chambeies, the quantity of resistance foil gage unit with the same and the one-to-one in quantity in response chamber, resistance foil gage unit includes that two are vertical laying the resistance foil gage in the response intracavity, the brush setting in half response intracavity and with resistance foil gage sliding fit.
The displacement detection device for the multi-leaf grating blade is characterized in that: the position matched with the sliding block on the partition plate and the position matched with the sliding block on the side wall of the shell are both provided with a limiting sliding groove for the sliding block to move, and the position matched with the limiting sliding groove on the sliding block is provided with a guide block.
Compared with the prior art, the utility model has the following advantage:
1. the utility model discloses a set up resistance strain foil group, the electrically conductive mechanism of multi-leaf blade drive is in resistance strain foil group goes up to slide, makes the displacement information transformation of multi-leaf blade become voltage signal and supply the computer to gather, reaches the purpose that directly detects multi-leaf blade displacement, and the accuracy of detection is higher, and the testing result is more directly perceived.
2. The utility model discloses a set up resistance strain gauge group and electrically conductive mechanism in the casing, make whole device structure compacter, the standard device size of being convenient for satisfies the demand of installing in a narrow and small space, and the installation effect is good.
To sum up, the utility model discloses simple structure, reasonable in design, the practicality is strong, and through set up resistance strain foil group in the casing, multi-leaf collimator blade drives electrically conductive mechanism and is in resistance strain foil group goes up to slide, makes multi-leaf collimator blade's displacement information turn into voltage signal and supply the computer to gather, reaches the purpose of direct detection multi-leaf collimator blade displacement, and the accuracy of detection is higher, and the testing result is more directly perceived, makes whole device structure compacter simultaneously, and the installation effect is good.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.
Fig. 3 is a usage state diagram of the present invention.
Description of reference numerals:
1-multi-leaf grating blade; 2-a blade guide frame; 3-a shell;
4-an electric brush; 5-a slide block; 6-connecting rod;
7-resistance strain gauge; 8-a separator; 9-a half induction cavity;
10-a linear motor; 11-guide block.
Detailed Description
The technical scheme of the utility model is explained in detail through embodiment 1 and implementation 2:
example 1
The displacement detection device of the multi-leaf collimator blade as shown in fig. 1 comprises a shell 3 arranged on a blade guide frame 2, a resistance strain gauge group arranged in the shell 3, and a conductive mechanism which is driven by a plurality of multi-leaf collimator blades 1 and slides on the resistance strain gauge group.
As shown in fig. 3, the multi-blade collimator blade 1 is driven by a linear motor 10, and the multi-blade collimator blade 1 is connected with the linear motor 10 through a connecting rod 6; the resistance strain gauge is connected with a computer, and the computer is used for collecting output signals of the resistance strain gauge group so as to obtain displacement signals of the multi-leaf grating blade 1, so that the multi-leaf grating blade 1 can be controlled subsequently;
it should be noted that the multi-leaf collimator generally includes 60 multi-leaf collimator blades 1, the 60 multi-leaf collimator blades 1 are all installed on the blade guide frame 2 and do linear motion along the length direction of the blade guide frame 2, the number of the linear motors 10 is multiple, and the number of the linear motors 10 is the same as and one-to-one corresponding to the number of the multi-leaf collimator blades 1;
by arranging the resistance strain gauge group, the multi-leaf grating blade 1 drives the conductive mechanism to slide on the resistance strain gauge group, so that displacement information of the multi-leaf grating blade 1 is converted into a voltage signal and is collected by a computer, the aim of directly detecting the displacement of the multi-leaf grating blade 1 is fulfilled, the detection accuracy is higher, and the detection result is more visual;
through setting up resistance strain foil group and electrically conductive mechanism in casing 3, make whole device structure compacter, the standard device size of being convenient for satisfies the demand of installing in a narrow and small space, and the installation is effectual.
In this embodiment, the conductive mechanism includes a plurality of brushes 4 all slidably engaged with the resistance strain gauge set and a plurality of sliders 5 for connecting the brushes 4 and the vanes 1, the number of the brushes 4 and the number of the sliders 5 are the same and are in one-to-one correspondence, one end of the slider 5 far away from the brushes 4 penetrates through the housing 3 and is fixedly connected with the vanes 1, and a guide groove is formed in a position of the housing 3 engaged with the slider 5.
In this embodiment, the resistance strain gauge set includes a plurality of resistance strain gauges 7 transversely arranged on the inner top surface of the housing 3 in sequence, and the number of the resistance strain gauges 7 is the same as that of the electric brushes 4 and corresponds to one another.
In the embodiment, the type of the resistance strain gauge 7 is BX120-50 AA;
it should be noted that the brush 4 is a conductive sheet type elastic structure, the head feeler of the brush is in contact with the carbon film on the surface of the resistance strain gauge 7 and slides relatively, the tail of the brush 4 is fixed on the multi-leaf collimator blade 1 through the slider 5 and moves synchronously with the multi-leaf collimator blade 1, and the brush is used for converting the position information of the multi-leaf collimator blade 1 into a voltage signal and transmitting the voltage signal to a computer for collection.
It should be noted that an insulating medium is arranged between two adjacent resistance strain gauges 7, so that the normal operation of a single resistance strain gauge 7 and the accurate output of an output signal are ensured; a plurality of resistance foil gages 7 transversely lay, can simplify resistance strain formula detection mechanism's structure, and casing 3 can design littleer when actual manufacturing, and the structure is compacter, satisfies the demand of installing in a narrow and small space, and the installation is effectual.
As shown in fig. 1 and fig. 3, in the present embodiment, when in use, the linear motor 10 drives the multi-leaf collimator blade 1 to make a linear motion, the multi-leaf collimator blade 1 drives the brush 4 to slide on the resistance strain gauge 7 through the slider 5, the contact angle of the head of the brush 4 contacts with the carbon film on the surface of the resistance strain gauge 7 and slides relatively, so that the resistance strain gauge 7 deforms under stress to generate a resistance change, and the resistance change is converted into a voltage signal to be transmitted to a computer for collection, that is, the position information of the multi-leaf collimator blade 1 is converted into the voltage signal to be transmitted to the computer for collection, so as to achieve the purpose of directly detecting the displacement of the multi-leaf collimator blade 1.
Example 2
As shown in fig. 2, this embodiment is different from embodiment 1 in that a plurality of sensing cavities are provided in the housing 3, two adjacent sensing cavities are provided with a partition plate 8 for dividing the housing 3 therebetween, each resistance strain gauge unit includes a plurality of resistance strain gauge units, the resistance strain gauge units are disposed in the sensing cavities and divide the sensing cavities into two half sensing cavities 9, the number of the resistance strain gauge units is the same as that of the sensing cavities and corresponds to one another, each resistance strain gauge unit includes two resistance strain gauges 7 vertically disposed in the sensing cavities, and the brushes 4 are disposed in the half sensing cavities 9 and are in sliding fit with the resistance strain gauges 7.
It should be noted that the sensing cavity is arranged to separate the plurality of resistance strain gauge units, so that accurate transmission of signals is ensured, and the anti-interference capability is stronger.
In this embodiment, the position of the partition plate 8, which is matched with the sliding block 5, and the position of the side wall of the shell 3, which is matched with the sliding block 5, are both provided with a limiting sliding groove for the sliding block 5 to move, and the position of the sliding block 5, which is matched with the limiting sliding groove, is provided with a guide block 11; the installation, the selection of the types of the elements and the working process of each mechanism of the embodiment are the same as those of the embodiment 1.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing above embodiment the utility model discloses technical scheme's within the scope of protection.
Claims (5)
1. A displacement detection device of a multi-leaf grating blade is characterized in that: the device comprises a shell (3) arranged on a blade guide frame (2), a resistance strain gauge set arranged in the shell (3), and a conductive mechanism driven by a plurality of multi-blade grating blades (1) and sliding on the resistance strain gauge set.
2. The apparatus of claim 1, wherein: the conducting mechanism comprises a plurality of electric brushes (4) which are in sliding fit with the resistance strain gauge groups and a plurality of sliders (5) used for connecting the electric brushes (4) and the multi-leaf collimator blades (1), the number of the electric brushes (4) and the number of the sliders (5) are identical and in one-to-one correspondence, one end, far away from the electric brushes (4), of each slider (5 penetrates through the shell (3) and is fixedly connected with the corresponding blade (1), and a guide groove is formed in the position, matched with the sliders (5), of the shell (3).
3. The apparatus of claim 2, wherein: the resistance strain gage group comprises a plurality of resistance strain gages (7) which are sequentially and transversely arranged on the inner top surface of the shell (3), and the number of the resistance strain gages (7) is the same as that of the electric brushes (4) and corresponds to that of the electric brushes one by one.
4. The apparatus of claim 2, wherein: be provided with a plurality of response chambeies in casing (3), adjacent two be provided with baffle (8) that are used for cutting apart casing (3) between the response chamber, resistance foil gage group includes a plurality of resistance foil gage units, resistance foil gage unit sets up the response intracavity and will the response chamber is cut apart into two and half response chamber (9), the quantity of resistance foil gage unit with the same and the one-to-one in quantity in response chamber, resistance foil gage unit includes that two are vertical laying up resistance foil gage (7) in the response intracavity, brush (4) set up in half response chamber (9) and with resistance foil gage (7) sliding fit.
5. The apparatus according to claim 4, wherein: the position matched with the sliding block (5) on the partition plate (8) and the position matched with the sliding block (5) on the side wall of the shell (3) are provided with limiting sliding grooves for the sliding block (5) to move, and the position matched with the limiting sliding grooves on the sliding block (5) is provided with a guide block (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021868837.5U CN213252658U (en) | 2020-08-31 | 2020-08-31 | Displacement detection device of multi-leaf grating blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021868837.5U CN213252658U (en) | 2020-08-31 | 2020-08-31 | Displacement detection device of multi-leaf grating blade |
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| Publication Number | Publication Date |
|---|---|
| CN213252658U true CN213252658U (en) | 2021-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021868837.5U Active CN213252658U (en) | 2020-08-31 | 2020-08-31 | Displacement detection device of multi-leaf grating blade |
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| CN (1) | CN213252658U (en) |
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- 2020-08-31 CN CN202021868837.5U patent/CN213252658U/en active Active
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