CN116520206B - Automatic measuring device for gradient magnetic field - Google Patents
Automatic measuring device for gradient magnetic field Download PDFInfo
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- CN116520206B CN116520206B CN202310707003.8A CN202310707003A CN116520206B CN 116520206 B CN116520206 B CN 116520206B CN 202310707003 A CN202310707003 A CN 202310707003A CN 116520206 B CN116520206 B CN 116520206B
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- 238000005259 measurement Methods 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims description 40
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 230000033001 locomotion Effects 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000005070 sampling Methods 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 4
- 239000000523 sample Substances 0.000 description 4
- 238000002595 magnetic resonance imaging Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000004323 axial length Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 210000004872 soft tissue Anatomy 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/022—Measuring gradient
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Condensed Matter Physics & Semiconductors (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention discloses an automatic measuring device for a gradient magnetic field, and relates to the technical field of magnetic field detection. The gradient magnetic field automatic measuring device comprises a magnetic field measuring sensor for measuring gradient coils, and further comprises a supporting component, a circumferential rotating component, an axial moving component and a radial moving component. The support assembly is used for installing the measuring device in the gradient coil, the circumferential rotating assembly is used for driving the measuring sensor and supporting all parts of the measuring sensor to circumferentially rotate, the axial moving assembly is used for driving all parts of the measuring sensor and supporting the measuring sensor to axially move, and the radial moving assembly is used for driving all parts of the measuring sensor and supporting the measuring sensor to radially move. The measuring device can drive the magnetic field measuring sensor to rotate, axially move and radially move in the gradient coil in the circumferential direction, so that the magnetic field measuring sensor can reach any position of the gradient coil to carry out sampling measurement.
Description
Technical Field
The invention relates to the technical field of magnetic field detection, in particular to an automatic gradient magnetic field measuring device.
Background
Magnetic resonance imaging is a noninvasive detection means and plays an important role in living organism research, modern medical diagnosis, physical chemistry, material science and other researches by utilizing the remarkable characteristic of high contrast of soft tissues.
The magnetic resonance imaging apparatus performs nuclear magnetic resonance detection to obtain an image, the quality of which is determined by the performance of a gradient magnetic field generated by a gradient coil in the magnetic resonance imaging apparatus, and the gradient magnetic field refers to a controllable magnetic field distribution which varies linearly within a certain spatial range. Specifically, the precession frequency of protons in magnetic resonance is determined by the intensity of a main magnetic field, the spatial information of the protons can be obtained easily by applying a linearly-changing gradient magnetic field, the linearity of the gradient magnetic field is related to the distortion degree of a magnetic resonance image and is an important index for measuring the stability of the gradient field, and the better the linearity is, the more accurate the gradient magnetic field is and the better the image quality is.
Whether the gradient magnetic field generated by the gradient coil after being electrified meets the design requirement or not needs to be measured and evaluated, and the performance such as the efficiency and the magnetic field linearity of the gradient coil can be tested by measuring the gradient magnetic field. The existing gradient magnetic field measuring device generally comprises a three-dimensional moving platform with a measuring arm, a Gaussian meter and a computer, wherein the three-dimensional moving platform is used for supporting a Gaussian meter probe to move in a three-dimensional space so as to measure magnetic field intensity at different sampling points, the existing three-dimensional moving platform is designed and manufactured for a fixed target area of a certain magnet, a measuring mode of fixed discrete sampling points is adopted, the existing three-dimensional moving platform can only be used for measuring gradient fields of a certain fixed target area, and if the target area is changed or the sampling points are changed, the three-dimensional moving platform needs to be manufactured again.
In summary, how to change the current situation that the magnetic field measurement sensor cannot measure any position of the gradient coil is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention is to provide an automatic gradient magnetic field measuring device, which can drive a magnetic field measuring sensor to rotate, move axially and move radially in the gradient coil, so as to reach any position of the gradient coil for sampling measurement.
In order to achieve the above object, the present invention provides the following technical solutions:
an automatic gradient magnetic field measuring device comprising a magnetic field measuring sensor for measuring gradient coils, further comprising:
the support assembly comprises at least three support legs which move synchronously, and is used for arranging the measuring device on the gradient coil, and the three support legs are uniformly arranged around the central line of the support assembly;
the circumferential rotating assembly comprises a second rotating shaft, the second rotating shaft is rotatably arranged on the supporting assembly, and the second rotating shaft is positioned on the central line;
the axial moving assembly comprises a third rotating shaft and a supporting piece, the third rotating shaft is rotatably sleeved in the second rotating shaft, the supporting piece is axially and slidably arranged on the second rotating shaft, and the third rotating shaft is in threaded connection with the supporting piece;
The radial moving assembly comprises a fourth rotating shaft, a fifth rotating shaft and a transmission assembly for converting the rotation of the fifth rotating shaft into radial rotation;
the fourth rotating shaft is rotatably sleeved in the third rotating shaft, and the fifth rotating shaft is slidably and non-rotatably sleeved in the fourth rotating shaft;
the transmission assembly is arranged on the supporting piece, the mounting seat of the magnetic field measuring sensor is arranged on the supporting piece in a sliding mode along the radial direction, and the mounting seat is in threaded connection with the transmission assembly.
Preferably, the device further comprises a driving assembly and a transmission assembly;
the transmission assembly comprises a first driven gear, a second driven gear and a third driven gear, wherein the first driven gear is coaxially fixed with the second rotating shaft, the second driven gear is coaxially fixed with the third rotating shaft, and the third driven gear is coaxially fixed with the fourth rotating shaft;
the driving assembly comprises a motor and a controller, the motor is used for driving the first driven gear, the second driven gear and the third driven gear to rotate, and the controller is in signal connection with the motor.
Preferably, the drive assembly further comprises a first drive gear, a second drive gear and a third drive gear;
The first driving gear, the second driving gear and the third driving gear are sequentially arranged and coaxially fixed on an output shaft of the motor, and the first driving gear is close to the free end of the output shaft;
the distance between the first driving gear and the second driving gear is greater than the distance between the second driving gear and the third driving gear;
the motor and/or the output shaft are adjustable in axial position;
the first driving gear can be meshed with any one of the first driven gear, the second driven gear and the third driven gear for transmission;
when the first driving gear and the first driven gear are in a meshing state, the second driving gear can be in meshing transmission with the second driven gear, and the third driving gear can be in meshing transmission with the third driven gear.
Preferably, the output shaft is rotatable and retractable, and the rotation and retraction of the output shaft are independent of each other.
Preferably, the locking device further comprises a locking assembly and an unlocking assembly;
the locking component is arranged on the supporting component, the locking component is abutted against the first driven gear, the second driven gear and the third driven gear, and the locking component is an elastic piece;
The unlocking assembly may be close to or remote from the locking assembly to lock or unlock the first, second and third driven gears.
Preferably, the locking assembly comprises a first plectrum, a second plectrum and a third plectrum;
the first shifting piece is abutted against the peripheral surface of the first driven gear;
the second shifting piece is abutted against the peripheral surface of the second driven gear;
the third shifting piece is abutted against the peripheral surface of the third driven gear;
the distance between the first plectrum and the second plectrum is larger than the distance between the second plectrum and the third plectrum;
the unlocking assembly comprises a first connecting piece and three occupation blocks, wherein the first connecting piece is axially arranged on the supporting assembly in a sliding manner, and the three occupation blocks are axially arranged on the first connecting piece in sequence;
the three occupation blocks can be simultaneously abutted against or separated from the first poking piece, the second poking piece and the third poking piece.
Preferably, the unlocking assembly further comprises a second connecting piece, the second connecting piece is sleeved on the outer portion of the output shaft, the second connecting piece is in clearance fit with the output shaft, blocking pieces used for limiting the second connecting piece are arranged on two sides of the second connecting piece, and the second connecting piece is fixedly connected with the first connecting piece.
Preferably, the support assembly further comprises a housing structure, a first shaft, a sun gear, and at least three wedges;
the first rotating shaft is sleeved outside the second rotating shaft;
the sun gear is coaxially fixed with the first rotating shaft, and the first rotating shaft penetrates through the shell structure;
the wedge block is arranged in the inner cavity of the shell structure in a sliding manner, gear teeth which can be meshed with the central gear are arranged on a first plane, which is close to the central gear, of the wedge block, a second plane of the wedge block is opposite to the first plane, and a non-zero included angle is formed between the second plane and the first plane;
the supporting legs are inserted into the shell structure, and each supporting leg is connected with the second plane of the wedge in a sliding mode.
Preferably, the transmission assembly further comprises a fourth driven gear coaxially fixed with the first rotating shaft, the first driving gear can be meshed with the fourth driven gear for transmission, and the distance between the fourth driven gear and the first driven gear is larger than the distance between the first driven gear and the third driven gear;
and/or, the locking assembly further comprises a fourth plectrum, the fourth plectrum is abutted against the fourth driven gear, and the distance between the fourth plectrum and the first plectrum is greater than the distance between the first plectrum and the third plectrum.
Preferably, the transmission assembly includes a first bevel gear and a second bevel gear;
the first bevel gear and the fifth rotating shaft are coaxially fixed, the second bevel gear is rotatably arranged on the supporting piece, the second bevel gear is meshed with the first bevel gear for transmission, and the peripheral surface of the rotating shaft of the second bevel gear is provided with external threads.
According to the automatic gradient magnetic field measuring device provided by the invention, one end of each supporting leg faces the central line of the supporting component, the other end of each supporting leg is a free end, and each supporting leg can synchronously and radially move, so that the supporting component realizes the function of installing the measuring device in a gradient coil; the circumferential rotating assembly is used for driving the measuring sensor and each part supporting the measuring sensor to circumferentially rotate, and specifically, the right end of the second rotating shaft is axially provided with a guide rail; the axial moving assembly is used for driving the measuring sensor and supporting all parts of the measuring sensor to move along the axial direction, specifically, the third rotating shaft penetrates through the central through hole of the second rotating shaft, the outer threads are machined on the peripheral surface of the right end of the third rotating shaft, the end part, close to the third rotating shaft, of the supporting piece is provided with a connecting hole along the axial direction, the connecting hole is provided with inner threads matched with the outer threads, the supporting piece can slide along the guide rail, and then the third rotating shaft can drive the supporting piece to slide along the guide rail, so that the supporting piece can be driven to slide along the axial direction.
The radial moving assembly is used for driving the measuring sensor and supporting each part of the measuring sensor to move along the radial direction, specifically, the fourth rotating shaft passes through the central through hole of the third rotating shaft, the fifth rotating shaft passes through the central hole of the fourth rotating shaft, and a limiting structure is arranged between the fifth rotating shaft and the fourth rotating shaft, so that the fifth rotating shaft can extend or retract from the fourth rotating shaft along the axial direction of the fifth rotating shaft, but the fifth rotating shaft and the fourth rotating shaft can only synchronously rotate, when the fourth rotating shaft rotates, the fifth rotating shaft rotates along with the fifth rotating shaft, and when the axial moving assembly acts, the fifth rotating shaft slides leftwards or rightwards in the fourth rotating shaft, thereby meeting the requirement of the axial length; the support piece is provided with a transmission component capable of converting axial rotation into radial rotation, the mounting seat is in threaded connection with the transmission component, and the transmission component can drive the mounting seat and the measuring sensor to do radial movement along the support piece under the driving of the fifth rotating shaft.
When the measuring device is used, the first rotating shaft is rotated to drive each supporting leg to synchronously move until the free end of each supporting leg is supported on the side wall of the gradient coil, and the measuring device is arranged in the gradient coil; rotating the second rotating shaft to drive the supporting piece and the magnetic field measuring sensor to circumferentially rotate, and rotating the magnetic field measuring sensor to a preset angle; rotating the third rotating shaft, driving the supporting piece to slide along the right end of the second rotating shaft, and driving the magnetic field measuring sensor to a preset axial position; the fourth rotating shaft is rotated to drive the fifth rotating shaft to rotate along with the fourth rotating shaft, the transmission assembly converts the rotation of the fifth rotating shaft into rotation around the radial direction, the mounting seat of the magnetic field measuring sensor is driven to move along the radial direction, the magnetic field measuring sensor is driven to a preset sampling point, and the magnetic field is measured through the magnetic field measuring sensor. The measuring device can drive the magnetic field measuring sensor to rotate, axially move and radially move in the gradient coil, and the magnetic field measuring sensor can reach any position of the gradient coil, so that the magnetic field measuring sensor can sample and measure at any position of the gradient coil.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a first schematic diagram of an embodiment of the present invention;
FIG. 2 is a second schematic diagram of an embodiment of the present invention;
FIG. 3 is a first cross-sectional view of an embodiment of the present invention;
FIG. 4 is a right side view of an embodiment of the present invention;
FIG. 5 is a second cross-sectional view of an embodiment of the present invention;
fig. 6 is a left side view of an embodiment of the present invention.
In fig. 1 to 6, reference numerals include:
1 is a supporting component, 11 is a shell structure, 12 is a first rotating shaft, 13 is a supporting leg, 14 is a sun gear, and 15 is a wedge block;
2 is a circumferential rotating component, 21 is a second rotating shaft, and 22 is a second supporting piece;
3 is an axial moving component, 31 is a third rotating shaft and 32 is a supporting piece;
4 is a radial moving assembly, 41 is a fourth rotating shaft, 42 is a fifth rotating shaft, 43 is a transmission assembly, 431 is a first bevel gear, 432 is a second bevel gear;
5 is a driving assembly, 51 is a motor, 52 is a first driving gear, 53 is a second driving gear, and 54 is a third driving gear;
6 is a transmission assembly, 61 is a first driven gear, 62 is a second driven gear, 63 is a third driven gear, and 64 is a fourth driven gear;
7 is a locking component, 71 is a first plectrum, 72 is a second plectrum, 73 is a third plectrum, and 74 is a fourth plectrum;
8 is an unlocking component, 81 is a first connecting piece, 82 is a occupying block, and 83 is a second connecting piece;
9 is a mounting seat;
x is axial, Y is radial, and M is circumferential.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides an automatic measuring device for a gradient magnetic field, which can drive a magnetic field measuring sensor to circumferentially rotate, axially move and radially move in a gradient coil so as to reach any position of the gradient coil for sampling measurement.
Referring to fig. 1 to 6, the present invention provides an automatic gradient magnetic field measuring device, which comprises a magnetic field measuring sensor for measuring gradient coils, and further comprises a supporting component 1, a circumferential rotating component 2, an axial moving component 3 and a radial moving component 4.
The support assembly 1 comprises at least three support legs 13 which move synchronously, the support legs 13 are used for arranging the measuring device on the gradient coil, and the three support legs 13 are uniformly arranged around the central line of the support assembly 1;
the circumferential rotation assembly 2 comprises a second rotating shaft 21, the second rotating shaft 21 is rotatably arranged on the support assembly 1, and the second rotating shaft 21 is positioned on the center line;
the axial moving assembly 3 comprises a third rotating shaft 31 and a supporting piece 32, the third rotating shaft 31 is rotatably sleeved in the second rotating shaft 21, the supporting piece 32 is axially and slidably arranged in the second rotating shaft 21, and the third rotating shaft 31 is in threaded connection with the supporting piece 32;
the radial moving assembly 4 includes a fourth rotating shaft 41, a fifth rotating shaft 42, and a transmitting assembly 43 for converting rotation of the fifth rotating shaft 42 into radial rotation; the fourth rotating shaft 41 is rotatably sleeved in the third rotating shaft 31, and the fifth rotating shaft 42 is slidably and non-rotatably sleeved in the fourth rotating shaft 41; the transmission component 43 is arranged on the supporting piece 32, the mounting seat 9 of the magnetic field measuring sensor is arranged on the supporting piece 32 in a sliding way along the radial direction, and the mounting seat 9 is in threaded connection with the transmission component 43.
The support component 1 is used for installing the measuring device in the gradient coil, specifically, one end of the support leg 13 faces the central line of the support component 11, the other end of the support leg 13 is a free end, preferably, the end face of the free end of the support leg 13 is of an arc-shaped structure, which is beneficial to being attached to the arc-shaped side wall of the gradient coil so as to stably support; each support leg 13 can move synchronously in the radial direction, for example, a disc structure is arranged, the end surface of the disc structure, which is close to the support leg 13, is provided with threads, and the side surface of the support leg 13, which is close to the disc structure, is provided with threads matched with the threads, so that the functions are realized.
The circumferential rotation component 2 is used for driving the measuring sensor and supporting all components of the measuring sensor to rotate circumferentially, specifically, the right end of the second rotating shaft 21 is provided with a guide rail along the axial direction, optionally, as shown in fig. 1, the right end of the second rotating shaft 21 is fixedly connected with the second supporting member 22, a welding or integrated structure is adopted, a guide rail is arranged on the second supporting member 22, the guide rail can adopt a linear sliding rail or a sliding groove, and the like, preferably, the guide rail adopts a sliding groove, and the sliding groove can accommodate the rotating third rotating shaft 31, so that the structure is simple and reasonable.
The axial moving assembly 3 is used for driving the measuring sensor and supporting each component of the measuring sensor to move along the axial direction, specifically, the third rotating shaft 31 passes through the central through hole of the second rotating shaft 21, the peripheral surface of the right end of the third rotating shaft 31 is processed with external threads, the end part of the supporting piece 32, which is close to the third rotating shaft 31, is provided with a connecting hole along the axial direction, the connecting hole is processed with internal threads which are matched with the external threads, the supporting piece 32 can slide along the guide rail, and then the third rotating shaft 31 rotates to drive the supporting piece 32 to slide along the guide rail, namely, the supporting piece 32 can be driven to slide along the axial direction.
The radial moving component 4 is used for driving the measuring sensor and supporting each component of the measuring sensor to move along the radial direction, specifically, the fourth rotating shaft 41 passes through the central through hole of the third rotating shaft 31, the fifth rotating shaft 42 passes through the central hole of the fourth rotating shaft 41, and a limiting structure such as a single key and a single key groove, a spline and a spline groove are arranged between the fifth rotating shaft 42 and the fourth rotating shaft 41, so that the fifth rotating shaft 42 can extend or retract from the fourth rotating shaft 41 along the axial direction, but the fifth rotating shaft 42 and the fourth rotating shaft 41 can only rotate synchronously, when the fourth rotating shaft 41 rotates, the fifth rotating shaft 42 rotates along with the fourth rotating shaft, and when the axial moving component 3 acts, the fifth rotating shaft 42 slides leftwards or rightwards in the fourth rotating shaft 41, thereby meeting the requirement of the axial length; the support 32 is provided with a rotatable and radially extending screw rod, the mounting seat 9 of the measuring sensor is provided with a radial through hole, the screw rod penetrates through the through hole of the mounting seat 9, the through hole of the mounting seat 9 is provided with an internal thread matched with the screw rod, the mounting seat 9 can slide along the support 32, and the mounting seat 9 can be driven to slide along the support 32 by rotating the screw rod, namely the mounting seat 9 can be driven to slide along the radial direction; the transmission assembly 43 converts the rotation of the fourth rotating shaft 41 and the fifth rotating shaft 42 into the rotation of a screw rod, and can realize that the fifth rotating shaft 42 is a worm, a worm wheel is coaxially fixed with the screw rod, and the screw rod is driven to rotate by adopting the transmission of the worm wheel and the worm, so that the mounting seat 9 and the measuring sensor can be driven to do radial movement.
The left end of the support member 32 is matched with the second rotating shaft 21 to slide along the axial direction, the right end of the support member 32 is matched with the mounting seat 9 to enable the mounting seat 9 to move along the radial direction, and optionally, as shown in fig. 1, the support member 32 is fixedly connected to form an L-shaped structure by adopting two linear structures, and welding, riveting and the like can be adopted to facilitate production.
The mounting base 9 may be in a rectangular block structure or any other type of structure, alternatively, a fixture is fixed on the mounting base 9, and the magnetic field measuring sensor is clamped by using the fixture, and of course, any other type of connection mode without clamping may be adopted, so long as the magnetic field measuring sensor can be fixed on the mounting base 9 to enable the magnetic field measuring sensor and the magnetic field measuring sensor to synchronously move.
Alternatively, the magnetic field measuring sensor 1 is a gauss probe or any other type, and the magnetic field measuring sensor 1 is directly used in the prior art, and thus, the structural features of the magnetic field measuring sensor 1 will not be described again.
It should be noted that, the axial position of each sleeve joint rotating shaft can be limited by a shaft retainer ring or any other type of limiting structure.
When in use, the first rotating shaft 12 is rotated to drive each supporting leg 13 to synchronously move until the free end of each supporting leg 13 is supported on the side wall of the gradient coil, and the measuring device is arranged in the gradient coil; rotating the second rotating shaft 21 to drive the supporting piece 32 and the magnetic field measuring sensor to rotate circumferentially, so that the magnetic field measuring sensor is rotated to a preset angle; rotating the third rotating shaft 31, driving the supporting piece 32 to slide along the right end of the second rotating shaft 21, and driving the magnetic field measuring sensor to a preset axial position; the fourth rotating shaft 41 is rotated to drive the fifth rotating shaft 42 to rotate along with the fourth rotating shaft, the transmission assembly 43 converts the rotation of the fifth rotating shaft 42 into rotation around a radial screw rod, the mounting seat 9 of the magnetic field measuring sensor is driven to move along the radial direction, the magnetic field measuring sensor is driven to a preset sampling point, and the magnetic field is measured through the magnetic field measuring sensor. The measuring device can drive the magnetic field measuring sensor to rotate, axially move and radially move in the gradient coil, and the magnetic field measuring sensor can reach any position of the gradient coil, so that the magnetic field measuring sensor can sample and measure at any position of the gradient coil.
It is worth to say that, the material of each spare part of this measuring device all selects the non-magnetic material, and optional, non-magnetic material is MC nylon or non-magnetic carbide etc. effectively avoids the influence to the magnetic field that awaits measuring, and effectively subtracts the influence to the testing result.
On the basis of the embodiment, the device also comprises a driving assembly 5 and a transmission assembly 6; the transmission assembly 6 includes a first driven gear 61, a second driven gear 62, and a third driven gear 63, the first driven gear 61 is coaxially fixed with the second rotation shaft 21, the second driven gear 62 is coaxially fixed with the third rotation shaft 31, and the third driven gear 63 is coaxially fixed with the fourth rotation shaft 41; the driving assembly 5 includes a motor 51 for driving the first, second and third driven gears 61, 62 and 63 to rotate, and a controller in signal connection with the motor 51.
The transmission assembly 6 is configured to transmit the power provided by the driving assembly 5 to a corresponding rotating shaft, specifically, as shown in fig. 1 and 2, the first driven gear 61 is driven to rotate the second rotating shaft 21, the second driven gear 62 is driven to rotate the third rotating shaft 31, and the third driven gear 63 is driven to rotate the fourth rotating shaft 41; the driving assembly 5 provides power for the measuring device, the motor 51 outputs rotation, optionally, the first driven gear 61, the second driven gear 62 and the third driven gear 63 are respectively and independently connected with one motor 51, further, the driving gear is connected on the output shaft of each motor 51, the first driven gear 61, the second driven gear 62 and the third driven gear 63 are respectively controlled by different driving gears, signals are transmitted between the controller and the motor 51, then the motion parameters of the motor 51 such as the rotation direction, the rotation speed, the acceleration and the like can be controlled through the controller, and further, the controller can collect the parameters fed back by the motor 51 and judge whether the measuring device moves normally or not. So set up, this measuring device realizes the full automatization, and easy and simple to handle, the magnetic field measurement sensor along circumference, axial or radial moving's position accuracy is higher, and measuring error is less.
On the basis of the above embodiment, the drive assembly 5 further comprises a first drive gear 52, a second drive gear 53 and a third drive gear 54; the first driving gear 52, the second driving gear 53 and the third driving gear 54 are sequentially arranged and coaxially fixed on the output shaft of the motor 51, and the first driving gear 52 is close to the free end of the output shaft; the distance between the first drive gear 52 and the second drive gear 53 is greater than the distance between the second drive gear 53 and the third drive gear 54; the motor 51 and/or the output shaft are adjustable in axial position; the first driving gear 52 can be meshed with any one of the first driven gear 61, the second driven gear 62 and the third driven gear 63; when the first driving gear 52 and the first driven gear 61 are in the engaged state, the second driving gear 53 can be engaged with the second driven gear 62, and the third driving gear 54 can be engaged with the third driven gear 63.
Specifically, as shown in fig. 1 to 3, the position of the motor 51 or the output shaft thereof along the axial direction is adjustable, and it is possible to implement that a linear slide rail along the axial direction is disposed on the support assembly 1, and the motor 51 is disposed on the slide rail, so that the motor 51 and the first driving gear 52, the second driving gear 53 and the third driving gear 54 disposed on the output shaft of the motor 51 can be moved along the axial direction, preferably, an electric linear slide rail is adopted, and the electric linear slide rail is in signal connection with a controller, so that the position of the motor 51 can be controlled by the controller, or two motors 51 are integrated, so that one motor 51 capable of outputting rotation and axial movement and the two movements are independent, thereby implementing the functions.
When the magnetic field sensor is used, the position of the motor 51 or the output shaft of the motor 51 is adjusted, and the meshing relationship between the driving gear and the driven gear is controlled, so that the magnetic field measuring sensor is driven to circumferentially rotate, axially move and radially move in the gradient coil, specifically, the first driving gear 52 is meshed with the first driven gear 61, the second driving gear 53 is meshed with the second driven gear 62, the third driving gear 54 is meshed with the third driven gear 63, and the second rotating shaft 21, the third rotating shaft 31, the fourth rotating shaft 41 and the fifth rotating shaft 42 are driven to synchronously rotate, so that the circumferential rotating movement is realized; the first driven gear 52 is meshed with the second driven gear 62, at this time, the first driven gear 61 is stopped, and since the distance between the first driven gear 52 and the second driven gear 53 is greater than the distance between the second driven gear 53 and the third driven gear 54, the third driven gear 63 is stopped, and only the third rotating shaft 31 is driven to rotate, thereby realizing the above axial movement; the first driving gear 52 is engaged with the third driven gear 63, and at this time, both the first driven gear 61 and the second driven gear 62 are stopped, and only the fourth rotation shaft 41 and the fifth rotation shaft 42 are driven to move synchronously, thereby realizing the radial movement.
On the basis of the embodiment, the output shaft can rotate and stretch out and draw back, and the rotation and the stretch out and draw back of the output shaft are mutually independent. The motor 51 with the output shaft capable of rotating and moving and the rotation and movement not mutually influencing is adopted, the rotation and movement of the output shaft of the motor 51 are controlled by the controller, full-automatic control is realized, the operation is simple and convenient, and the structure is simple.
On the basis of the above embodiment, the locking assembly 7 and the unlocking assembly 8 are also included; the locking assembly 7 is arranged on the supporting assembly 1, the locking assembly 7 is abutted against the first driven gear 61, the second driven gear 62 and the third driven gear 63, and the locking assembly 7 is an elastic piece; the unlocking assembly 8 may be moved closer to or farther from the locking assembly 7 to lock or unlock the first, second, and third driven gears 61, 62, 63.
Specifically, the locking assembly 7 may be three separate components respectively abutted with the first driven gear 61, the second driven gear 62 and the third driven gear 63, or the locking assembly 7 may be one component simultaneously abutted with the first driven gear 61, the second driven gear 62 and the third driven gear 63, and the locking assembly 7 may be a sheet structure or any other shape; the unlocking component 8 slides axially on the supporting component 1 so as to be close to the locking component 7, so that the locking component 7 is separated from the original position, and the driven gears are unlocked, otherwise, the unlocking component 8 is far away from the locking component 7, so that the locking component 7 can be restored to the original position, the driven gears are locked, the number of the unlocking components 8 is not limited, and optionally, the three unlocking components 8 are respectively responsible for unlocking the corresponding first driven gears 61, second driven gears 62 or third driven gears 63.
So set up, the second rotating shaft 21, the third rotating shaft 31, the fourth rotating shaft 41 and the fifth rotating shaft 42 in this measuring device rotate or not more controllably, help to move the magnetic field measuring sensor to the preset position accurately.
On the basis of the above embodiment, the locking assembly 7 includes the first dial 71, the second dial 72 and the third dial 73; the first shifting piece 71 is abutted against the peripheral surface of the first driven gear 61, the second shifting piece 72 is abutted against the peripheral surface of the second driven gear 62, the third shifting piece 73 is abutted against the peripheral surface of the third driven gear 63, and the distance between the first shifting piece 71 and the second shifting piece 72 is larger than the distance between the second shifting piece 72 and the third shifting piece 73; the unlocking assembly 8 comprises a first connecting piece 81 and three occupation blocks 82, the first connecting piece 81 is axially and slidably arranged on the supporting assembly 1, the three occupation blocks 82 are axially and sequentially arranged on the first connecting piece 81, and the three occupation blocks 82 can be simultaneously abutted against or separated from the first shifting piece 71, the second shifting piece 72 and the third shifting piece 73.
Specifically, as shown in fig. 2, the first shifting piece 71, the second shifting piece 72 and the third shifting piece 73 are all elastic sheet structures; the first connecting piece 81 may adopt a strip structure with an arc-shaped or rectangular cross-section, and the three occupation blocks 82 are all arranged on the first connecting piece 81, so that the first connecting piece 81 can be moved to simultaneously drive the three occupation blocks 82 to move, and the three occupation blocks 82 can be simultaneously abutted against or separated from the first shifting piece 71, the second shifting piece 72 and the third shifting piece 73, so that the positions of the three occupation blocks 82 respectively correspond to the first shifting piece 71, the second shifting piece 72 and the third shifting piece 73, namely, the distance between the right occupation block 82 and the middle occupation block 82 is equal to the distance between the first shifting piece 71 and the second shifting piece 72, and the distance between the middle occupation block 82 and the left occupation block 82 is equal to the distance between the second shifting piece 72 and the third shifting piece 73.
When the rotary lock is used, the position of the first connecting piece 81 is adjusted, the position relation between the occupation blocks 82 and each plectrum is controlled, so that the driven gear is locked or unlocked, specifically, the three occupation blocks 82 are simultaneously abutted with the first plectrum 71, the second plectrum 72 and the third plectrum 73, so that the first plectrum 71, the second plectrum 72 and the third plectrum 73 are deformed and separated from the original positions, and the second rotary shaft 21, the third rotary shaft 31, the fourth rotary shaft 41 and the fifth rotary shaft 42 can be unlocked; the right-side occupation block 82 is abutted against the second shifting piece 72, so that the second shifting piece 72 deforms to be separated from the original position, at this time, the first shifting piece 71 is located in the original position, and since the distance between the right-side occupation block 82 and the middle occupation block 82 is larger than the distance between the middle occupation block 82 and the left-side occupation block 82, the third shifting piece 73 is located in the original position, and only the second shifting piece 72 deforms to be separated from the original position, namely only the third rotating shaft 31 is unlocked; the occupying block 82 located on the right side is abutted against the third shifting piece 73, so that the third shifting piece 73 is deformed to be separated from the original position, and at this time, the first shifting piece 71 and the second shifting piece 72 are located in the original position, namely, only the fourth rotating shaft 41 and the fifth rotating shaft 42 are unlocked. So set up, simple structure, and the position of removing first connecting piece 81 can realize above-mentioned function, and the operation is comparatively simple and convenient.
On the basis of the above embodiment, the unlocking assembly 8 further includes a second connecting piece 83, the second connecting piece 83 is sleeved outside the output shaft, the second connecting piece 83 is in clearance fit with the output shaft, blocking pieces for limiting the second connecting piece 83 are arranged on two sides of the second connecting piece 83, and the second connecting piece 83 is fixedly connected with the first connecting piece 81.
Specifically, as shown in fig. 2, the blocking member is a shaft retainer ring or a shaft shoulder and the like arranged on the output shaft of the motor 51, and the blocking member can limit the second connecting member 83 to move along the axial direction synchronously with the motor 51 or the output shaft; the second connecting member 83 is spaced from the output shaft of the motor 51, and the second connecting member 83 is connected to the first connecting member 81, and since the first connecting member 81 can move only in the axial direction along the supporting assembly 1, the second connecting member 83 does not rotate with the output shaft of the motor 51.
The second connecting piece 83 connects the first connecting piece 81 and the occupation blocks 82 arranged on the first connecting piece 81 on the output shaft of the motor 51, so that when the motor 51 or the output shaft of the motor 51 moves along the axial direction, the three occupation blocks 82 can be driven to move synchronously, and when the motor 51 or the output shaft of the motor 51 is moved to enable the driving gear to be meshed with the driven gear correspondingly, under the action of the occupation blocks 82, the driven gear which needs to rotate can be unlocked, so that the energy consumption is further reduced, and the operation and control are simplified.
Optionally, as shown in fig. 6, the second connecting piece 83 has an arc structure, and is adapted to the circular peripheral surface of the driven gear, so that interference between the second connecting piece 83 and the driven gear is effectively avoided, and smooth operation of the measuring device is facilitated.
On the basis of the above embodiment, the support assembly 1 further comprises a housing structure 11, a first shaft 12, a sun gear 14 and at least three wedges 15; the first rotating shaft 12 is sleeved outside the second rotating shaft 21; the sun gear 14 is coaxially fixed with the first rotating shaft 12, and the first rotating shaft 12 is inserted into the housing structure 11; the wedge 15 is slidably arranged in the inner cavity of the shell structure 11, the first plane of the wedge 15, which is close to the sun gear 14, is provided with gear teeth which can be meshed with the sun gear 14, the second plane of the wedge 15 is opposite to the first plane, and a non-zero included angle is formed between the second plane and the first plane; the supporting legs 13 penetrate through the shell structure 11, and each supporting leg 13 is slidably connected with the second plane of the corresponding wedge 15.
Specifically, as shown in fig. 5, the housing structure 11 is used for supporting the first rotating shaft 12, the supporting leg 13, etc., and a sliding groove is formed in the housing structure 11 along the tangential direction of the sun gear 14, so that the wedge 15 can slide in the inner cavity of the housing structure 11; the wedge 15 is provided with a linear chute on the second plane, so that the supporting piece can slide in the second plane, and the supporting leg 13 slidingly connected to the second plane of the wedge 15 can extend or retract into the shell structure 11 during the sliding of the wedge 15 due to the non-zero included angle between the second plane of the wedge 15 and the first plane. When the rotary support device is used, the first rotary shaft 12 is rotated to drive the central gear 14 to rotate, gear teeth on the wedge block 15 are meshed with the central gear 14 to drive the wedge block 15 to slide in the shell structure 11, so that the support leg 13 positively rotated by the central gear 14 moves towards the direction of extending out of the shell structure 11, and conversely, the support leg 13 reversely rotated by the central gear 14 moves towards the direction of retracting into the inner cavity of the shell structure 11.
It should be noted that, when the support assembly 1 needs to be locked and unlocked, the same type of structure as the locking assembly 7 and the unlocking assembly 8 may be adopted, or any other type of functional assembly having locking and unlocking functions independent of the locking assembly 7 and the unlocking assembly 8 may be adopted.
On the basis of the above embodiment, the transmission assembly 6 further includes a fourth driven gear 64 coaxially fixed with the first rotation shaft 12, the first driving gear 52 is capable of meshing transmission with the fourth driven gear 64, and the distance between the fourth driven gear 64 and the first driven gear 61 is greater than the distance between the first driven gear 61 and the third driven gear 63; and/or the locking assembly 7 further comprises a fourth paddle 74, the fourth paddle 74 abutting the fourth driven gear 64, the distance between the fourth paddle 74 and the first paddle 71 being greater than the distance between the first paddle 71 and the third paddle 73.
In use, the position of the motor 51 or the output shaft of the motor 51 is adjusted to control the meshing relationship between the driving gear and the driven gear, so as to drive the supporting assembly 1 to mount the measuring device in the gradient coil, specifically, the first driving gear 52 is meshed with the fourth driven gear 64, at this time, since the distance between the fourth driven gear 64 and the first driven gear 61 is greater than the distance between the first driven gear 61 and the third driven gear 63, the first driven gear 61, the second driven gear 62 and the third driven gear 63 are all stopped, and only the first rotating shaft 12 is driven to rotate, thereby realizing the function of mounting the measuring device in the gradient coil.
Alternatively, the fourth driven gear 64 is driven by one motor 51, and the first driven gear 61, the second driven gear 62, and the third driven gear 63 are driven by the other motor 51.
Optionally, the fourth paddle 74 is of an elastic plate structure, and the arrangement directions of the fourth paddle 74 and the first paddle 71, the second paddle 72 and the third paddle 73 are the same, when the device is used, the position of the first connecting piece 81 is adjusted, the position relationship between the occupation block 82 and each paddle is controlled, so that the driven gear is locked or unlocked, specifically, the occupation block 82 located on the right side is abutted against the fourth paddle 74, so that the fourth paddle 74 deforms to be separated from the original position, and at this time, since the distance between the fourth paddle 74 and the first paddle 71 is greater than the distance between the first paddle 71 and the third paddle 73, the first paddle 71, the second paddle 72 and the third paddle 73 are all located in the original position, and only the fourth paddle 74 deforms to be separated from the original position, namely only the first rotating shaft 12 is unlocked. So set up, simple structure, and the position of removing first connecting piece 81 can realize above-mentioned function, and the operation is comparatively simple and convenient.
Alternatively, the fourth paddle 74 is unlocked using an unlocking assembly 8 that is independent of the first connector 81, or the measuring device may be provided with both the fourth paddle 74 and the fourth driven gear 64 or only one of them.
On the basis of any of the above embodiments, the transmission assembly 43 comprises a first bevel gear 431 and a second bevel gear 432; the first bevel gear 431 is coaxially fixed with the fifth rotating shaft 42, the second bevel gear 432 is rotatably arranged on the supporting member 32, the second bevel gear 432 is meshed with the first bevel gear 431 for transmission, and the peripheral surface of the rotating shaft of the second bevel gear 432 is provided with external threads.
Specifically, as shown in fig. 4, the rotating shaft of the second bevel gear 432 is a screw rod with external threads, and the right end of the fifth rotating shaft 42 is fixed with the first bevel gear 431, so that the first bevel gear 431 is meshed with the second bevel gear 432, and then the screw rod can be driven to rotate, and further the mounting seat 9 and the measuring sensor can be driven to perform radial movement. So set up, this measuring device's simple structure, required movable range is less, is applicable to narrow and small space.
It should be noted that relational terms such as "first" and "second" and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities; the terms "upper surface, lower surface, top, bottom" and the terms "upper, lower, left, right" are defined above based on the drawings of the specification.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The automatic gradient magnetic field measuring device provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (9)
1. An automatic gradient magnetic field measuring device comprising a magnetic field measuring sensor for measuring gradient coils, characterized by further comprising:
the support assembly (1) comprises at least three support legs (13) which move synchronously, the support legs (13) are used for arranging the measuring device on the gradient coil, and the three support legs (13) are uniformly arranged around the central line of the support assembly (1);
The circumferential rotating assembly (2) comprises a second rotating shaft (21), the second rotating shaft (21) is rotatably arranged on the supporting assembly (1), and the second rotating shaft (21) is positioned on the central line;
the axial moving assembly (3) comprises a third rotating shaft (31) and a supporting piece (32), wherein the third rotating shaft (31) is rotatably sleeved in the second rotating shaft (21), the supporting piece (32) is axially and slidably arranged in the second rotating shaft (21), and the third rotating shaft (31) is in threaded connection with the supporting piece (32);
a radial movement assembly (4) comprising a fourth rotation shaft (41), a fifth rotation shaft (42) and a transmission assembly (43) for converting the rotation of the fifth rotation shaft (42) into radial rotation;
the fourth rotating shaft (41) is rotatably sleeved in the third rotating shaft (31), and the fifth rotating shaft (42) is slidably and non-rotatably sleeved in the fourth rotating shaft (41);
the transmission assembly (43) is arranged on the supporting piece (32), the mounting seat (9) of the magnetic field measurement sensor is arranged on the supporting piece (32) in a sliding manner along the radial direction, and the mounting seat (9) is in threaded connection with the transmission assembly (43);
The device also comprises a driving component (5) and a transmission component (6);
the transmission assembly (6) comprises a first driven gear (61), a second driven gear (62) and a third driven gear (63), wherein the first driven gear (61) is coaxially fixed with the second rotating shaft (21), the second driven gear (62) is coaxially fixed with the third rotating shaft (31), and the third driven gear (63) is coaxially fixed with the fourth rotating shaft (41);
the driving assembly (5) comprises a motor (51) and a controller, the motor (51) is used for driving the first driven gear (61), the second driven gear (62) and the third driven gear (63) to rotate, and the controller is in signal connection with the motor (51).
2. The automatic gradient magnetic field measurement device according to claim 1, wherein the drive assembly (5) further comprises a first drive gear (52), a second drive gear (53) and a third drive gear (54);
the first driving gear (52), the second driving gear (53) and the third driving gear (54) are sequentially arranged and coaxially fixed on an output shaft of the motor (51), and the first driving gear (52) is close to the free end of the output shaft;
-the distance between the first drive gear (52) and the second drive gear (53) is greater than the distance between the second drive gear (53) and the third drive gear (54);
the motor (51) and/or the output shaft are/is adjustable in axial position;
the first driving gear (52) can be meshed with any one of the first driven gear (61), the second driven gear (62) and the third driven gear (63);
when the first driving gear (52) and the first driven gear (61) are in a meshed state, the second driving gear (53) can be meshed with the second driven gear (62) for transmission, and the third driving gear (54) can be meshed with the third driven gear (63) for transmission.
3. The apparatus according to claim 2, wherein the output shaft is rotatable and retractable, and the rotation and retraction of the output shaft are independent of each other.
4. The automatic gradient magnetic field measurement device according to claim 2, further comprising a locking assembly (7) and an unlocking assembly (8);
the locking assembly (7) is arranged on the supporting assembly (1), the locking assembly (7) is abutted against the first driven gear (61), the second driven gear (62) and the third driven gear (63), and the locking assembly (7) is an elastic piece;
The unlocking assembly (8) may be close to or remote from the locking assembly (7) to lock or unlock the first driven gear (61), the second driven gear (62) and the third driven gear (63).
5. The automatic gradient magnetic field measurement device according to claim 4, wherein the locking assembly (7) comprises a first paddle (71), a second paddle (72) and a third paddle (73);
the first pulling piece (71) is abutted against the peripheral surface of the first driven gear (61);
the second pulling piece (72) is abutted against the peripheral surface of the second driven gear (62);
the third shifting piece (73) is abutted against the peripheral surface of the third driven gear (63);
the distance between the first poking piece (71) and the second poking piece (72) is larger than the distance between the second poking piece (72) and the third poking piece (73);
the unlocking assembly (8) comprises a first connecting piece (81) and three occupation blocks (82), wherein the first connecting piece (81) is axially arranged on the supporting assembly (1) in a sliding mode, and the three occupation blocks (82) are axially arranged on the first connecting piece (81) in sequence;
the three occupation blocks (82) can be simultaneously abutted against or separated from the first poking piece (71), the second poking piece (72) and the third poking piece (73).
6. The automatic gradient magnetic field measurement device according to claim 5, wherein the unlocking component (8) further comprises a second connecting piece (83), the second connecting piece (83) is sleeved outside the output shaft, the second connecting piece (83) is in clearance fit with the output shaft, blocking pieces for limiting the second connecting piece (83) are arranged on two sides of the second connecting piece (83), and the second connecting piece (83) is fixedly connected with the first connecting piece (81).
7. The automatic gradient magnetic field measurement device according to claim 5, wherein the support assembly (1) further comprises a housing structure (11), a first rotation shaft (12), a sun gear (14) and at least three wedges (15);
the first rotating shaft (12) is sleeved outside the second rotating shaft (21);
the sun gear (14) is coaxially fixed with the first rotating shaft (12), and the first rotating shaft (12) is inserted into the shell structure (11);
the wedge block (15) is slidably arranged in the inner cavity of the shell structure (11), gear teeth which can be meshed with the sun gear (14) are arranged on a first plane, close to the sun gear (14), of the wedge block (15), a second plane of the wedge block (15) is opposite to the first plane, and a non-zero included angle is formed between the second plane and the first plane;
The supporting feet (13) penetrate through the shell structure (11), and each supporting foot (13) is connected with the second plane of the corresponding wedge block (15) in a sliding mode.
8. The gradient magnetic field automatic measurement device according to claim 7, wherein the transmission assembly (6) further comprises a fourth driven gear (64) coaxially fixed with the first rotating shaft (12), the first driving gear (52) is meshably driven with the fourth driven gear (64), and a distance between the fourth driven gear (64) and the first driven gear (61) is larger than a distance between the first driven gear (61) and the third driven gear (63);
and/or, the locking assembly (7) further comprises a fourth poking piece (74), the fourth poking piece (74) is abutted against the fourth driven gear (64), and the distance between the fourth poking piece (74) and the first poking piece (71) is larger than the distance between the first poking piece (71) and the third poking piece (73).
9. The automatic gradient magnetic field measurement device according to any one of claims 1 to 8, wherein the transmission assembly (43) comprises a first bevel gear (431) and a second bevel gear (432);
The first bevel gear (431) and the fifth rotating shaft (42) are coaxially fixed, the second bevel gear (432) is rotatably arranged on the supporting piece (32), the second bevel gear (432) is in meshed transmission with the first bevel gear (431), and the peripheral surface of the rotating shaft of the second bevel gear (432) is provided with external threads.
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| CN202310707003.8A CN116520206B (en) | 2023-06-15 | 2023-06-15 | Automatic measuring device for gradient magnetic field |
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| CN101688908A (en) * | 2007-04-04 | 2010-03-31 | 皇家飞利浦电子股份有限公司 | Separate type gradient coil and use the PET/MRI commingled system of this gradient coil |
| CN102998633A (en) * | 2012-12-12 | 2013-03-27 | 中国科学院高能物理研究所 | Magnetic field measurement device of magnetic resonance imaging superconducting magnet central area |
| CN107064838A (en) * | 2017-04-25 | 2017-08-18 | 北京青檬艾柯科技有限公司 | It is a kind of to form the magnet system configurations and measuring method for becoming gradient magnetostatic field |
| CN115494437A (en) * | 2022-09-23 | 2022-12-20 | 重庆邮电大学 | Hand-held low-gradient single-side nuclear magnetic resonance device for detecting full-thickness skin |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018212858A1 (en) * | 2018-08-01 | 2020-02-06 | Siemens Healthcare Gmbh | Magnetic resonance device, magnetic resonance system and associated operating method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688908A (en) * | 2007-04-04 | 2010-03-31 | 皇家飞利浦电子股份有限公司 | Separate type gradient coil and use the PET/MRI commingled system of this gradient coil |
| CN102998633A (en) * | 2012-12-12 | 2013-03-27 | 中国科学院高能物理研究所 | Magnetic field measurement device of magnetic resonance imaging superconducting magnet central area |
| CN107064838A (en) * | 2017-04-25 | 2017-08-18 | 北京青檬艾柯科技有限公司 | It is a kind of to form the magnet system configurations and measuring method for becoming gradient magnetostatic field |
| CN115494437A (en) * | 2022-09-23 | 2022-12-20 | 重庆邮电大学 | Hand-held low-gradient single-side nuclear magnetic resonance device for detecting full-thickness skin |
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