Gradient magnetic field automatic measurement pneumatic device

Abstract

The utility model discloses a gradient magnetic field automatic measurement pneumatic device, which belongs to the technical field of gradient magnetic field measurement equipment and comprises an axial moving rod connected with a first cylinder. The supporting fixing disc is fixedly connected with the first air cylinder. A plurality of supporting through holes distributed in the circumferential direction are formed in the supporting fixing disc, movable supporting rods are arranged in the supporting through holes, and the supporting rods are connected with a supporting movement assembly; the circumferential rotating block is arranged at the end, away from the first air cylinder, of the axial moving rod and connected with a rotating movement assembly. The radial moving block is arranged on the circumferential rotating block and is connected with a radial moving assembly; the magnetic field measuring assembly is arranged on the radial moving block; according to the utility model, the support motion assembly can drive the plurality of support rods to synchronously and radially move, thereby realizing the internal positioning of the gradient coil; the first air cylinder, the rotary motion assembly and the radial motion assembly can adjust the positions of the magnetic field measurement assembly in the gradient coil in the axial direction, the circumferential direction and the radial direction respectively, and the control precision and the measurement precision are high.

Description

Technical Field

[0001] This utility model relates to the technical field of gradient magnetic field measurement equipment, specifically to a pneumatic device for automatic gradient magnetic field measurement. Background Technology

[0002] Magnetic resonance imaging (MRI) is a non-invasive diagnostic tool that utilizes the high contrast of soft tissues, playing a vital role in biological research, modern medical diagnosis, physical chemistry, and materials science. When MRI equipment performs nuclear magnetic resonance (NMR) scans to obtain images, the image quality is determined by the performance of the gradient magnetic field generated by the gradient coils in the MRI equipment. The gradient magnetic field refers to a linearly varying, controllable magnetic field distribution within a certain spatial range. Specifically, the precession frequency of protons in MRI is determined by the strength of the main magnetic field. By applying a linearly varying gradient magnetic field, the spatial information of protons can be easily obtained. The linearity of the gradient magnetic field is related to the degree of distortion in the MRI image and is an important indicator of the stability of the gradient field. The better the linearity, the more accurate the gradient magnetic field, and the better the image quality.

[0003] Whether the gradient magnetic field generated by the gradient coil after being energized meets the design requirements needs to be measured and evaluated. By measuring the gradient magnetic field, the performance of the gradient coil, such as efficiency and magnetic field linearity, can be tested. Existing gradient magnetic field measurement devices typically include a three-dimensional moving platform with a measuring arm, a gaussmeter, and a computer. The gaussmeter moves in three-dimensional space driven by the three-dimensional moving platform to measure the magnetic field strength at different sampling points. The current three-dimensional moving platform has an overly complex structure, requires too high precision, and is prone to errors in measurement results. Furthermore, the electronically controlled three-dimensional moving platform can interfere with magnetic resonance imaging, easily causing ghosting, poor uniformity, and a series of other problems. Consequently, the material requirements for the components of the three-dimensional moving platform are also relatively high.

[0004] Therefore, developing and designing an automatic gradient magnetic field measurement pneumatic device with low requirements for gradient coil size and magnetic field strength, high control and measurement accuracy, and simple structure is an urgent problem to be solved at this stage. Summary of the Invention

[0005] To address the problems existing in the prior art, this utility model provides an automatic pneumatic device for measuring gradient magnetic fields. The supporting motion component can drive multiple supporting rods on the supporting fixed plate to move synchronously radially, which can stably position this utility model inside the gradient coil. The first cylinder drives the axial moving rod to move, which can adjust the axial position of the magnetic field measuring component inside the gradient coil. The rotary motion component drives the circumferential rotating block to rotate, which can adjust the circumferential position of the magnetic field measuring component inside the gradient coil. The radial motion component drives the radial moving block to move, which can adjust the radial position of the magnetic field measuring component inside the gradient coil. Thus, it can measure the magnetic field strength at any sampling point inside the gradient coil. It is suitable for gradient coils of different sizes and has high control and measurement accuracy.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides a pneumatic device for automatic measurement of gradient magnetic fields, comprising:

[0008] An axially movable rod, which is connected to a first cylinder that drives it to move along its axial direction;

[0009] A support fixing plate is fixedly connected to the first cylinder, and the axis of the support fixing plate is collinear with the axis of the axial moving rod. The support fixing plate has a plurality of circumferentially distributed support through holes, which extend radially. A support rod is provided in each support through hole and can move radially relative to the support through hole. One end of the support rod is located inside the support fixing plate, and the other end of the support rod is located outside the support fixing plate. The support rod is connected to a support motion assembly that drives its movement.

[0010] A circumferential rotating block is located at the end of the axial moving rod away from the first cylinder; the circumferential rotating block is connected to a rotary motion assembly, which can drive the circumferential rotating block to rotate around the axis of the axial moving rod.

[0011] A radial moving block is disposed on the circumferential rotating block, the radial moving block is capable of moving radially relative to the circumferential rotating block, and the radial moving block is connected to a radial motion component that drives its movement;

[0012] A magnetic field measuring component is mounted on the radial moving block.

[0013] As a preferred technical solution, the support fixing plate is located between the first cylinder and the circumferential rotating block, and the support fixing plate is sleeved on the axial moving rod; the support fixing plate and the first cylinder are connected by a fixed bracket.

[0014] As a preferred technical solution, the supporting motion assembly includes a second cylinder and several connecting rods. The piston rod of the second cylinder is sleeved on the axial moving rod and can move along the axial direction of the axial moving rod. The piston rod of the second cylinder and the axial moving rod are in clearance fit. The connecting rods correspond one-to-one with the support rods. One end of the connecting rod is hinged to the piston rod of the second cylinder, and the other end of the connecting rod is hinged to the end of the support rod located inside the supporting fixed plate.

[0015] As a preferred technical solution, the support rod has a support head at one end outside the support fixing plate, and the support head is made of an elastomeric material.

[0016] As a preferred technical solution, the support through hole is provided with a radially extending slide, the support rod matches the slide, the support rod is embedded in the slide and can move radially relative to the support through hole.

[0017] As a preferred technical solution, the rotary motion assembly includes a first mounting plate and a rotary cylinder. The first mounting plate is fixed to the end of the axial moving rod away from the first cylinder, the cylinder body of the rotary cylinder is fixed to the first mounting plate, and the circumferential rotating block is disposed on the piston rod of the rotary cylinder.

[0018] As a preferred technical solution, the first mounting plate is perpendicular to the axis of the axial moving rod;

[0019] And / or, the axis of the piston rod of the rotary cylinder is collinear with the axis of the axial moving rod.

[0020] As a preferred technical solution, the circumferential rotating block is provided with a second mounting plate, the radial motion component is provided as a slide cylinder, the slide rail of the slide cylinder is fixed to the second mounting plate, and the slider of the slide cylinder forms the radial moving block.

[0021] As a preferred technical solution, the second mounting plate is parallel to the first mounting plate;

[0022] And / or, the extension direction of the slide rail of the slide cylinder is perpendicular to the axis of the axial moving rod.

[0023] As a preferred technical solution, the magnetic field measuring component is a gaussmeter;

[0024] And / or, the slider of the slide cylinder is provided with a mounting base that matches the magnetic field measuring component.

[0025] The beneficial effects of this utility model are as follows:

[0026] 1. The support motion component of this utility model can drive multiple support rods on the support fixing plate to move synchronously radially, which can conveniently and securely position this utility model inside the gradient coil; at the same time, the first cylinder drives the axial moving rod to move, which can adjust the axial position of the magnetic field measuring component inside the gradient coil; the rotation motion component drives the circumferential rotating block to rotate, which can adjust the circumferential position of the magnetic field measuring component inside the gradient coil; and the radial motion component drives the radial moving block to move, which can adjust the radial position of the magnetic field measuring component inside the gradient coil. Thus, the magnetic field strength at any sampling point inside the gradient coil can be measured. It is suitable for gradient coils of different sizes and has high control and measurement accuracy.

[0027] 2. Compared with existing gradient magnetic field measuring devices, this utility model has lower requirements for the size of the electromagnetic coil and the magnetic field strength; the first cylinder, the support motion component, the rotation motion component and the radial motion component are all pneumatically controlled, and the control accuracy can reach a movement accuracy of 0.01mm and a rotation accuracy of 1°, which is higher than the gear control accuracy of existing gradient magnetic field measuring devices; in addition, the components of this utility model have a simple structure and are easy to operate, which can realize gradient magnetic field measurement more conveniently, accurately and automatically. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the automatic gradient magnetic field measuring pneumatic device of this utility model;

[0029] Figure 2 for Figure 1 A schematic diagram of the supporting and fixing plate in the middle;

[0030] Figure 3 for Figure 1 A schematic diagram of the structure of the circumferential rotating block and the radial moving block.

[0031] In the figure: 1-Axial moving rod, 11-First cylinder, 2-Support fixing plate, 21-Support through hole, 22-Fixed bracket, 3-Support rod, 31-Second cylinder, 32-Connecting rod, 33-Support head, 4-Circumferential rotating block, 41-First mounting plate, 42-Rotating cylinder, 5-Radial moving block, 51-Second mounting plate, 52-Slide cylinder, 6-Magnetic field measuring component. Detailed Implementation

[0032] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0033] Please refer to Figures 1-3 This invention provides an embodiment of an automatic gradient magnetic field measurement pneumatic device, which includes an axial moving rod 1 and a first cylinder 11 that drives the axial moving rod 1 to move along its axial direction.

[0034] The support plate 2 is fixedly connected to the first cylinder 11. The axis of the support plate 2 is collinear with the axis of the axial moving rod 1. The support plate 2 is provided with several circumferentially distributed support through holes 21. The support through holes 21 extend radially. The support rod 3 is provided in the support through holes 21. The support rod 3 can move radially relative to the support through holes 21. One end of the support rod 3 is located inside the support plate 2, and the other end of the support rod 3 is located outside the support plate 2. The support rod 3 is connected to a support motion assembly that drives its movement. The support motion assembly can drive multiple support rods 3 to move radially synchronously, so that the end of the support rod 3 abuts against the inner wall surface of the gradient coil. This can conveniently and stably position the support plate 2 and the first cylinder 11 inside the gradient coil, and make the axis of the axial moving rod 1 collinear with the axis of the gradient coil.

[0035] The circumferential rotating block 4 is located at the end of the axial moving rod 1 away from the first cylinder 11; the circumferential rotating block 4 is connected to a rotary motion component, which can drive the circumferential rotating block 4 to rotate around the axis of the axial moving rod 1.

[0036] The radial moving block 5 is disposed on the circumferential rotating block 4. The radial moving block 5 can move radially relative to the circumferential rotating block 4. The radial moving block 5 is connected to a radial motion component that drives its movement.

[0037] The magnetic field measuring component 6 is mounted on the radial moving block 5. The first cylinder 11 drives the axial moving rod 1 to move, which can adjust the axial position of the magnetic field measuring component 6 inside the gradient coil. The rotary motion component drives the circumferential rotating block 4 to rotate, which can adjust the circumferential position of the magnetic field measuring component 6 inside the gradient coil. The radial motion component drives the radial moving block 5 to move, which can adjust the radial position of the magnetic field measuring component 6 inside the gradient coil. Thus, the magnetic field measuring component 6 can be accurately moved to any sampling point in three-dimensional space and the magnetic field strength can be measured.

[0038] It should be noted that the axial, circumferential, and radial directions in this utility model are all based on the axis of the axial moving rod 1; at the same time, all components in this utility model should be made of non-magnetic materials to avoid affecting magnetic resonance imaging.

[0039] In this embodiment, please refer to Figure 1 The support fixing plate 2 is located between the first cylinder 11 and the circumferential rotating block 4. The support fixing plate 2 is sleeved on the axial moving rod 1. The support fixing plate 2 will not interfere with the movement of the axial moving rod 1. The support fixing plate 2 and the first cylinder 11 are fixedly connected by the fixing bracket 22.

[0040] Further, please refer to Figure 2The supporting motion assembly includes a second cylinder 31 and several connecting rods 32. The piston rod of the second cylinder 31 is sleeved on the axial moving rod 1 and can move along the axial direction of the axial moving rod 1. The piston rod of the second cylinder 31 and the axial moving rod 1 are clearance-fitted, and there is no mutual interference between the piston rod of the second cylinder 31 and the axial moving rod 1. The connecting rods 32 correspond one-to-one with the support rods 3. One end of the connecting rod 32 is hinged to the piston rod of the second cylinder 31, and the other end of the connecting rod 32 is hinged to the end of the support rod 3 located inside the support fixing plate 2. When the piston rod of the second cylinder 31 retracts, all the support rods 3 can be synchronously radially retracted inward through the connecting rods 32, which can be easily separated from the inner wall surface of the gradient coil. When the piston rod of the second cylinder 31 extends, all the support rods 3 can be synchronously radially expanded outward through the connecting rods 32 until they abut against the inner wall surface of the gradient coil.

[0041] For details, please refer to Figure 2 The support rod 3 has a support head 33 at one end located outside the support fixing plate 2. The support head 33 is made of elastic material. When the support rod 3 moves radially outward synchronously, the support head 33 abuts against the inner wall surface of the gradient coil. This will not damage the inner wall surface of the gradient coil, while improving the positioning effect of the support fixing plate 2.

[0042] It should be noted that a radially extending slide should be provided in the support through hole 21. The support rod 3 matches the slide and is embedded in the slide, and can move radially relative to the support through hole 21, ensuring that the support rod 3 can only move radially relative to the support fixing plate 2, thereby improving the positioning effect.

[0043] In this embodiment, please refer to Figure 3 The rotary motion assembly includes a first mounting plate 41 and a rotary cylinder 42. The first mounting plate 41 is fixed to the end of the axial moving rod 1 away from the first cylinder 11. The cylinder body of the rotary cylinder 42 is fixed on the first mounting plate 41. The circumferential rotating block 4 is disposed on the piston rod of the rotary cylinder 42. The piston rod of the rotary cylinder 42 can drive the circumferential rotating block 4 to rotate.

[0044] For details, please refer to Figure 3 The surface of the first mounting plate 41 should be perpendicular to the axis of the axial moving rod 1; and the axis of the piston rod of the rotary cylinder 42 should be collinear with the axis of the axial moving rod 1 to ensure that the circumferential rotating block 4 rotates stably around the axis of the axial moving rod 1.

[0045] Based on the foregoing embodiments, please refer to Figure 3 The circumferential rotating block 4 is provided with a second mounting plate 51, and the radial motion component is a slide cylinder 52. The slide rail of the slide cylinder 52 is fixed on the second mounting plate 51, and the slider of the slide cylinder 52 forms a radial moving block 5, which can move smoothly radially relative to the axial moving rod 1.

[0046] For details, please refer to Figure 3 The second mounting plate 51 should be parallel to the first mounting plate 41; at the same time, the extension direction of the slide rail of the slide cylinder 52 should be perpendicular to the axis of the axial moving rod 1 to ensure that the slider of the slide cylinder 52 moves smoothly radially relative to the axial moving rod 1.

[0047] In this embodiment, please refer to Figure 3 The slider of the slide cylinder 52 is equipped with a mounting base that matches the magnetic field measuring component 6, and the magnetic field measuring component 6 can be easily fixed on the mounting base.

[0048] Specifically, the magnetic field measuring component 6 is preferably a gaussmeter.

[0049] Please refer to Figures 1-3 The specific usage of this utility model is as follows:

[0050] Fixing the support plate 2 to the gradient coil: Place the present invention inside the gradient coil. At this time, the piston rod of the second cylinder 31 is in the retracted state. After the present invention is adjusted to a suitable position inside the gradient coil, the piston rod of the second cylinder 31 extends, so that all the support rods 3 expand radially outward synchronously and abut against the inner wall of the gradient coil, thereby achieving relative fixation between the support plate 2 and the gradient coil.

[0051] Automatic measurement of gradient magnetic field: By turning the first cylinder 11 on and off, the axial moving rod 1 moves axially, realizing the axial motion measurement of the magnetic field measuring component 6; by turning the rotary cylinder 42 on and off, the circumferential rotating block 4 rotates circumferentially, realizing the circumferential motion measurement of the magnetic field measuring component 6; by turning the slide cylinder 52 on and off, the radial moving block 5 rotates radially, realizing the radial motion measurement of the magnetic field measuring component 6.

[0052] It should be noted that displacement sensors are provided at the first cylinder 11 and the slide cylinder 52, and an angle sensor is provided at the rotary cylinder 42. These sensors can precisely control the position of the magnetic field measuring component 6 in the axial, circumferential, and radial directions, ensuring measurement accuracy.

[0053] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gradient magnetic field automatic measurement aerodynamic device, characterized in that, The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device.

2. The automatic measurement device of the gradient magnetic field according to claim 1, wherein, The application relates to a magnetic field measuring device.

3. The automatic measurement device of the gradient magnetic field according to claim 2, characterized in that, The application relates to a magnetic field measuring device.

4. The automatic aerodynamic device for measuring gradient magnetic field according to claim 1 or 3, characterized in that, The application relates to a magnetic field measuring device.

5. The automatic aerodynamic device for measuring gradient magnetic field according to claim 1 or 3, characterized in that, The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. The application relates to a magnetic field measuring device. 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7. A device for automatic measurement of aerodynamic characteristics in a gradient magnetic field according to claim 6, characterised in that, The first mounting plate (41) is perpendicular to the axis of the axial moving rod (1). And / or, the axis of the piston rod of the rotating cylinder (42) is collinear with the axis of the axial moving rod (1).

8. The automatic measurement device of the gradient magnetic field according to claim 6, wherein, The circumferential rotating block (4) is provided with a second mounting plate (51), the radial motion assembly is a sliding table cylinder (52), the sliding rail of the sliding table cylinder (52) is fixed to the second mounting plate (51), and the sliding block of the sliding table cylinder (52) forms the radial moving block (5).

9. The automatic measurement device of the gradient magnetic field according to claim 8, wherein, The second mounting plate (51) is parallel to the first mounting plate (41). And / or, the extension direction of the sliding rail of the sliding table cylinder (52) is perpendicular to the axis of the axial moving rod (1).

10. The automatic measurement device of the gradient magnetic field according to claim 8, wherein, The magnetic field measuring assembly (6) is a gauss meter. And / or, the sliding block of the sliding table cylinder (52) is provided with a mounting seat matched with the magnetic field measuring assembly (6).

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