A magnetofluid sensor preparation device

Abstract

The application provides a magnetic fluid sensor preparation device, and relates to the technical field of magnetic fluid sensor preparation.The device comprises a magnetic fluid sensor base material, the magnetic fluid sensor base material comprises a capsule, an electrode a and an electrode b, the electrode a and the electrode b are arranged at two ends of the capsule respectively, a fixed ring in communication with the inside of the capsule is arranged on the surface of the capsule close to the electrode b, a silica rubber block is arranged in the fixed ring, a positioning groove is arranged on the surface of the electrode a, the frame comprises a lower frame and an upper frame arranged on the top of the lower frame, a feeding device is arranged in the lower frame, and a perfusion device is arranged in the upper frame.The feeding device is used for feeding conductive magnetic fluid, the perfusion device is used for perfusing the conductive magnetic fluid into the magnetic fluid sensor base material, the preparation of a magnetic field sensor based on the conductive magnetic fluid is realized, and the problem that there is no preparation device for the magnetic field sensor based on the conductive magnetic fluid in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of magnetohydrodynamic sensor fabrication technology, and more specifically to a magnetohydrodynamic sensor fabrication apparatus. Background Technology

[0002] In recent years, magnetic field sensing technology has seen significant development and has been widely applied in various fields such as biomedicine, power systems, and national defense. Magnetic field sensors based on magnetic materials are an important type of magnetic field sensor. Their core component is the magnetic material, magnetofluid, also known as ferrofluid, magnetic colloid, or magnetic liquid. It is a stable colloidal system formed by nanoscale magnetic particles encapsulating surfactants and uniformly dispersing them in a carrier liquid. It possesses both the magnetism of solid magnetic materials and the fluidity of liquids, making it a novel functional material. The microstructure of magnetofluid consists of three parts: magnetic particles, carrier liquid, and surfactant. Due to the fluidity of liquids and the magnetism of solids, magnetofluids exhibit many unique magnetic, optical, and electrical phenomena, such as the Faraday effect, birefringence, and linear dichroism. These properties have significant application prospects in fields such as optical modulation, optical switches, optical isolators, and sensors. Adding conductive substances to magnetofluids can yield a conductive electromagnetic fluid that is both magnetic and conductive. Enclosing a conductive electromagnetic fluid within an elastic capsule allows it to easily deform under the influence of a magnetic field. This deformation causes a change in its resistance, which, when a certain voltage is applied, manifests as an electrical signal. By analyzing the changes in this electrical signal, the change in the magnetic field can be determined. Currently, there are no existing technologies for fabricating magnetic field sensors based on conductive electromagnetic fluids. Summary of the Invention

[0003] This invention provides a magnetic fluid sensor fabrication apparatus. By using a feeding device to supply conductive electromagnetic fluid and an injection device to inject the conductive electromagnetic fluid into a magnetic fluid sensor substrate, a magnetic field sensor based on conductive electromagnetic fluid is fabricated, thus solving the problem that there is no fabrication apparatus for magnetic field sensors based on conductive electromagnetic fluid in the prior art.

[0004] In view of the above problems, the technical solution proposed by the present invention is as follows:

[0005] A magnetohydrodynamic sensor fabrication apparatus, comprising:

[0006] A magnetohydrodynamic sensor substrate includes a capsule, an electrode a, and an electrode b. The electrode a and the electrode b are respectively disposed at both ends of the capsule and extend into the interior of the capsule. The capsule is filled with gas to keep the capsule in an inflated state.

[0007] A fixing ring communicating with the interior of the capsule is provided on the surface of the capsule near the electrode b, and a silicone rubber block is provided inside the fixing ring;

[0008] The surface of electrode a is provided with a positioning groove;

[0009] A frame, the frame including a lower frame and an upper frame disposed on top of the lower frame;

[0010] The feeding device is disposed inside the lower frame;

[0011] Injection device, wherein the injection device is disposed inside the upper frame;

[0012] The feeding device is connected to the injection device through pipe b, and a solenoid valve is installed on pipe b;

[0013] The magnetofluid sensor substrate is disposed inside the infusion device, which is used to fill the magnetofluid sensor substrate with magnetofluid.

[0014] To better realize the technical solution of the present invention, the following technical measures were also adopted.

[0015] Furthermore, the feeding device includes an air compressor, a storage container, and a pipe a. The air compressor and the storage container are arranged side by side inside the lower frame, and the airflow output end of the air compressor is connected to the top side of the storage container through the pipe a.

[0016] Furthermore, the injection device includes a lifting device, an angle limiting device, a position fixing device, a rectangular column, and an injection device. The lifting device includes a hydraulic cylinder a and a tray. The hydraulic cylinder a is disposed inside the lower frame, and its output end extends into the upper frame and connects to the tray. The angle limiting device is disposed on the tray. A support is also disposed inside the upper frame. One end of the rectangular column is connected to the bottom of the support, and the other end of the rectangular column is connected to the position fixing device. The injection device is sleeved on the rectangular column and is slidably connected to the rectangular column. The injection device is connected to the bottom of the support.

[0017] Furthermore, the angle limiting device includes a limiting plate, the top of which is provided with a plurality of grooves a, the bottom of the inner wall of the grooves a is provided with limiting blocks, the limiting blocks cooperate with the positioning groove and are inserted into the positioning groove, the bottom of the limiting plate is provided with a protrusion, and the top of the tray is provided with a rectangular groove of the same size and shape as the protrusion, the protrusion being inserted into the rectangular groove.

[0018] Furthermore, the position fixing device includes a cover plate, a vacuum pump, and a pipe c. The top axis of the cover plate is fixedly connected to the rectangular column. The bottom of the cover plate is provided with several annularly arranged recesses. The cover plate is provided with through holes a and b, which are respectively connected to the recesses. The vacuum pump is located on the top of the support. The suction end of the vacuum pump is connected to one end of the pipe c, and the other end of the pipe c is connected to the interior of the recesses.

[0019] Furthermore, the size and shape of the through hole a are consistent with the size and shape of the fixing ring, the size and shape of the through hole b are consistent with the size and shape of the electrode b, the through hole a is coaxially arranged with the fixing ring, and the through hole b is coaxially arranged with the electrode b.

[0020] Furthermore, the injection device includes a cylinder body, a piston, a hydraulic cylinder b, a hydraulic cylinder c, and an injection needle tube. The cylinder body is sleeved on the column of the rectangular column and located directly above the position fixing device. The piston is disposed inside the cylinder body. One end of the hydraulic cylinder b is connected to the bottom of the support, and the other end of the hydraulic cylinder b is connected to one side of the top of the cylinder body. The hydraulic cylinder c is installed on the other side of the top of the cylinder body. The output shaft of the hydraulic cylinder c passes through the top of the cylinder body and is connected to the piston. The injection needle tube is disposed at the bottom of the cylinder body and communicates with the interior of the cylinder body. An exhaust needle tube is also disposed on the injection needle tube.

[0021] Furthermore, the injection needle tube is coaxially arranged with the through hole a.

[0022] Furthermore, one end of the pipe b passes through the top of the storage container and extends to the bottom of the inner wall of the storage container, while the other end of the pipe b is connected to one side of the cylinder.

[0023] Furthermore, the limiting block is used to cooperate with the positioning groove to restrict the position of the bladder inside the groove a.

[0024] Compared with the prior art, the beneficial effects of the present invention are: by using a feeding device to feed the conductive electromagnetic fluid, and the injection device to inject the conductive electromagnetic fluid into the magnetic fluid sensor substrate, the fabrication of a magnetic field sensor based on conductive electromagnetic fluid is realized, which solves the problem that the prior art does not have a fabrication device for magnetic field sensors based on conductive electromagnetic fluid.

[0025] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the magnetohydrodynamic sensor fabrication apparatus disclosed in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the internal structure of the magnetohydrodynamic sensor fabrication apparatus disclosed in an embodiment of the present invention after the upper and lower frames have been opened;

[0028] Figure 3 This is a schematic diagram of the infusion device disclosed in an embodiment of the present invention;

[0029] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle;

[0030] Figure 5 for Figure 3 A schematic diagram of the cross-sectional structure;

[0031] Figure 6 for Figure 5 Enlarged structural diagram at point A in the middle;

[0032] Figure 7 for Figure 5 Enlarged structural diagram at point B;

[0033] Figure 8 for Figure 5 Enlarged structural diagram at point C;

[0034] Figure 9 This is a schematic diagram of the structure of the magnetohydrodynamic sensor substrate disclosed in an embodiment of the present invention.

[0035] Reference numerals: 1. Frame; 11. Upper frame; 12. Lower frame; 13. Support; 2. Feeding device; 21. Air compressor; 22. Storage container; 23. Pipe a; 3. Pipe b; 4. Solenoid valve; 5. Filling device; 51. Lifting device; 511. Hydraulic cylinder a; 512. Pallet; 5121. Rectangular groove; 52. Angle limiting device; 521. Limiting plate; 5211. Groove a; 522. Limiting block; 523. Protrusion; 53. Position fixing device; 531 5311. Cover plate; 5312. Through hole a; 5313. Through hole b; 5314. Recessed part; 532. Vacuum pump; 533. Pipe c; 54. Rectangular column; 55. Injection device; 551. Cylinder body; 552. Piston; 553. Hydraulic cylinder b; 554. Hydraulic cylinder c; 555. Injection needle tube; 556. Exhaust needle tube; 6. Magnetohydrodynamic sensor substrate; 61. Encapsulation body; 62. Electrode a; 621. Positioning groove; 63. Electrode b; 64. Fixing ring; 65. Silicone rubber block. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] See attached document Figure 1-9 As shown, a magnetohydrodynamic (MHD) sensor fabrication apparatus includes a MHD sensor substrate 6. The MHD sensor substrate 6 includes a capsule 61, electrodes a62 and b63. ​​Electrodes a62 and b63 are respectively disposed at both ends of the capsule 61 and extend into the interior of the capsule 61. The capsule 61 is filled with gas to keep it in an inflated state. The capsule 61 is a one-piece structure. A retaining ring 64 communicating with the interior of the capsule 61 is disposed on the surface of the capsule 61 near the electrode b63. The fixing ring 64 has a silicone rubber block 65 inside, and the electrode a62 has a positioning groove 621 on its surface. The frame 1 includes a lower frame 12 and an upper frame 11 set on top of the lower frame 12. The feeding device 2 is set inside the lower frame 12, and the filling device 5 is set inside the upper frame 11. The feeding device 2 is connected to the filling device 5 through the pipe b3. The pipe b3 is equipped with a solenoid valve 4. The magnetic fluid sensor substrate 6 is set inside the filling device 5. The filling device 5 is used to fill the magnetic fluid sensor substrate 6 with magnetic fluid.

[0038] It should be noted that after the magnetic fluid is filled into the magnetic fluid sensor substrate 6, a signal detection circuit needs to be connected. Specifically, electrodes a and b are connected to the signal detection circuit to detect the resistance change of the magnetic fluid sensor to detect the magnetic field strength. The detection circuit uses existing technology, which will not be described in detail here. This application only focuses on the detection part that changes due to the magnetic field.

[0039] See attached document Figure 2 As shown, in this embodiment of the invention, the feeding device 2 includes an air compressor 21, a storage container 22 and a pipe a23. The air compressor 21 and the storage container 22 are arranged side by side inside the lower frame 12. The airflow output end of the air compressor 21 is connected to the top side of the storage container 22 through the pipe a23.

[0040] Specifically, the storage container 22 stores an electromagnetic fluid. During the fabrication of the magnetohydrodynamic sensor, the air compressor 21 inputs gas into the storage container 22 through pipe a23 to apply pressure to the electromagnetic fluid inside. The solenoid valve 4 is opened, and under the pressure, the electromagnetic fluid in the storage container 22 enters the filling device 5 through pipe b3. It should be noted that the storage container 22 and pipe b3 are made of plastic material, and pipe b3 is a flexible pipe.

[0041] See attached document Figure 2-9As shown, in this embodiment of the invention, the injection device 5 includes a lifting device 51, an angle limiting device 52, a position fixing device 53, a rectangular column 54, and an injection device 55. The lifting device 51 includes a hydraulic cylinder a511 and a tray 512. The hydraulic cylinder a511 is disposed inside the lower frame 12, and the output end of the hydraulic cylinder a511 extends into the upper frame 11 and connects to the tray 512. The angle limiting device 52 is disposed on the tray 512. A support 13 is also disposed inside the upper frame 11. One end of the rectangular column 54 is connected to the bottom of the support 13, and the other end of the rectangular column 54 is connected to the position fixing device 53. The injection device 55 is sleeved on the rectangular column 54 and is slidably connected to the rectangular column 54. The injection device 55 is connected to the bottom of the support 13.

[0042] Specifically, in this embodiment of the invention, the angle limiting device 52 includes a limiting disk 521. The top of the limiting disk 521 has several grooves a5211 for mounting the magnetic fluid sensor substrate 6. A limiting block 522 is provided at the bottom of the inner wall of the groove a5211. The limiting block 522 cooperates with the positioning groove 621 and is inserted into the interior of the positioning groove 621. The limiting block 522 is used to restrict the position of the capsule 61 inside the groove a5211. The electrode a62 end of the magnetic fluid sensor substrate 6 is inserted into the groove a5211. After the positioning groove 621 and the limiting block 522 are aligned, the magnetic fluid sensor substrate 6 is installed. At this time, the magnetic fluid sensor substrate 6 is... The position in the groove a5211 is fixed. The bottom of the limiting plate 521 is provided with a protrusion 523. The top of the tray 512 is provided with a rectangular groove 5121 of the same size and shape as the protrusion 523. The protrusion 523 is inserted into the inside of the rectangular groove 5121. The limiting plate 521 can be detachably connected to the tray 512. Specifically, after the limiting plate 521 is removed, the magnetic fluid sensor substrate 6 is installed into the groove a5211 on the limiting plate 521 by manual installation. At this time, the positions of the magnetic fluid sensor substrate 6 installed in the groove a5211 are all fixed. The positions of the silicone rubber block 65 and the electrode b63 on the magnetic fluid sensor substrate 6 correspond to the through holes a5311 and b5312.

[0043] It should be noted that the number of grooves a5211 is set according to the size of the magnetohydrodynamic sensor substrate 6. The number of grooves a5211 shown in the figure is one embodiment, and the specific number is set according to actual needs. It should not be regarded as a limitation of this application.

[0044] See attached document Figure 2-6As shown, in this embodiment of the invention, the position fixing device 53 includes a cover plate 531, a vacuum pump 532, and a pipe c533. The top axis of the cover plate 531 is fixedly connected to the rectangular column 54. The bottom of the cover plate 531 is provided with a plurality of annularly arranged recesses 5313. The cover plate 531 is provided with through holes a5311 and b5312 respectively communicating with the recesses 5313. The vacuum pump 532 is located on the top of the support 13. The suction end of the vacuum pump 532 is connected to one end of the pipe c533, and the other end of the pipe c533 is connected to the interior of the recesses 5313.

[0045] Specifically, after the magnetohydrodynamic sensor substrate 6 is installed on the angle limiting device 52, the hydraulic cylinder a511 lifts the limiting plate 521 upwards via the tray 512, causing the limiting plate 521 to fit against the cover plate 531. It should be noted that a sealing gasket can be provided on the bottom of the cover plate 531 to enhance the sealing between the limiting plate 521 and the cover plate 531. The shape of the concave portion 5313 matches the shape of both ends of the magnetohydrodynamic sensor substrate 6. During the process of lifting the limiting plate 521, the electrode b63 of the magnetohydrodynamic sensor substrate 6 is inserted into the through hole b5312. The through hole a5311 is directly opposite the silicone rubber block 65. It should also be noted that the pipe c533... The other end is connected to the interior of the recess 5313. After the vacuum pump 532 is started, a negative pressure environment is formed inside the recess 5313. It should be specifically noted that the recess 5313 is provided with several suction holes, which are not shown in the attached figure. The suction holes are arranged in a ring and are interconnected. The suction holes are located at the fixing ring 64. After the fixing ring 64 is attached to the recess 5313, the suction holes are just adsorbed around the fixing ring 64. The suction holes are connected to the other end of the pipe c533. Under the action of the vacuum pump 532, a negative pressure environment is formed inside the recess 5313. The position of the fixing ring 64 of the magnetohydrodynamic sensor substrate 6 is fixed at the through hole a5311.

[0046] See attached document Figure 3-6 As shown, in this embodiment of the invention, the size and shape of the through hole a5311 are consistent with the size and shape of the fixing ring 64, the size and shape of the through hole b5312 are consistent with the size and shape of the electrode b63, the through hole a5311 and the fixing ring 64 are coaxially arranged, and the through hole b5312 and the electrode b63 are coaxially arranged.

[0047] See attached document Figure 3-7As shown, in this embodiment of the invention, the injection device 55 includes a cylinder 551, a piston 552, a hydraulic cylinder b553, a hydraulic cylinder c554, and an injection needle tube 555. The cylinder 551 is sleeved on the column of the rectangular column 54 and is located directly above the position fixing device 53. The piston 552 is disposed inside the cylinder 551. One end of the hydraulic cylinder b553 is connected to the bottom of the support 13, and the other end of the hydraulic cylinder b553 is connected to one side of the top of the cylinder 551. The hydraulic cylinder c554 is installed on the other side of the top of the cylinder 551. The output shaft of the hydraulic cylinder c554 passes through the top of the cylinder 551 and is connected to the piston 552. The injection needle tube 555 is disposed at the bottom of the cylinder 551 and communicates with the interior of the cylinder 551. An exhaust needle tube 556 is also disposed on the injection needle tube 555.

[0048] Specifically, the injection needle 555 and the through hole a5311 are coaxially arranged. One end of the pipe b3 passes through the top of the storage container 22 and extends to the bottom of the inner wall of the storage container 22. The other end of the pipe b3 is connected to one side of the cylinder 551. During the input of the magnetic flux, the hydraulic cylinder c554 drives the piston 552 to move upward inside the cylinder 551. At the same time, the solenoid valve 4 opens, allowing the magnetic flux inside the storage container 22 to be input into the cylinder 551. When the magnetic flux is injected into the magnetic fluid sensor substrate 6, the solenoid valve 4 is closed, and the hydraulic cylinder b553 drives the cylinder 551 to move downward along the rectangular column 54, causing the injection needle 555 and the exhaust needle 556 to pierce the silicone rubber. Block 65 enters the interior of the capsule 61. At this time, hydraulic cylinder c554 drives piston 552 to move downward inside cylinder 551, discharging the electromagnetic fluid inside cylinder 551 from injection needle 555 into the capsule 61 of the magnetohydrodynamic sensor substrate 6. The gas inside capsule 61 is discharged from exhaust needle 556. It should be noted that after the infusion is completed, hydraulic cylinder b553 drives cylinder 551 to move upward along rectangular column 54, driving injection needle 555 and exhaust needle 556 to be pulled out from silicone rubber block 65. Silicone rubber block 65 seals the interior of capsule 61. After the limiting plate 521 is removed from tray 512, further sealing treatment is required at silicone rubber block 65.

[0049] Specifically, the filling principle of the magnetohydrodynamic sensor fabrication device is as follows: Electromagnetic conductive fluid is stored in the storage container 22. Air compressor 21 inputs gas into the storage container 22 through pipe a23, pressurizing the electromagnetic conductive fluid inside. This increases the pressure inside the storage container 22, opening solenoid valve 4. Hydraulic cylinder c554 drives piston 552 to move upwards inside cylinder body 551, allowing the electromagnetic conductive fluid inside the storage container 22 to flow into cylinder body 551. After cylinder body 551 is filled with electromagnetic conductive fluid, solenoid valve 4 is closed. After the magnetohydrodynamic sensor substrate 6 is installed onto the angle limiting device 52, hydraulic cylinder a511 lifts the limiting plate 521 upwards through tray 512, causing the limiting plate 521 to fit against the cover plate 531. After vacuum pump 532 starts, a negative pressure environment is created inside the concave portion 5313, fixing the magnetohydrodynamic sensor substrate 6. Hydraulic cylinder b553 drives cylinder body 551. Moving downwards along the rectangular column 54, the injection needle 555 and the exhaust needle 556 pierce the silicone rubber block 65 and enter the interior of the capsule 61. The hydraulic cylinder c554 drives the piston 552 to move downwards inside the cylinder 551, discharging the electromagnetic fluid inside the cylinder 551 from the injection needle 555 into the capsule 61 of the magnetic fluid sensor substrate 6. The gas inside the capsule 61 is discharged from the exhaust needle 556, completing the infusion of magnetic fluid into the magnetic fluid sensor substrate 6. After infusion, the limiting plate 521 is removed from the tray 512, and the silicone rubber block 65 is further sealed. The electromagnetic fluid is supplied by the feeding device 2, and the infusion device 5 infuses the electromagnetic fluid into the magnetic fluid sensor substrate 6, realizing the fabrication of a magnetic field sensor based on electromagnetic fluid. This solves the problem that there is no fabrication device for magnetic field sensors based on electromagnetic fluid in the prior art.

[0050] It should be noted that the specific models and specifications of solenoid valve 4, hydraulic cylinder a511, hydraulic cylinder b553 and hydraulic cylinder c554 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0051] The power supply and operating principle of solenoid valve 4, hydraulic cylinders a511, b553 and c554 are clear to those skilled in the art and will not be described in detail here.

[0052] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A magnetohydrodynamic sensor fabrication apparatus, characterized in that, include: A magnetohydrodynamic sensor substrate (6) includes a capsule (61), an electrode a (62), and an electrode b (63). The electrode a (62) and the electrode b (63) are respectively disposed at both ends of the capsule (61), and the electrode a (62) and the electrode b (63) extend into the interior of the capsule (61). The capsule (61) is filled with gas to keep the capsule (61) in an expanded state. A fixing ring (64) communicating with the inside of the capsule (61) is provided on the surface of the capsule (61) near the electrode b (63), and a silicone rubber block (65) is provided inside the fixing ring (64). The surface of electrode a (62) is provided with a positioning groove (621); The frame (1) includes a lower frame (12) and an upper frame (11) disposed on top of the lower frame (12). A feeding device (2) is disposed inside the lower frame (12); An injection device (5) is disposed inside the upper frame (11). The injection device (5) includes a lifting device (51), an angle limiting device (52), a position fixing device (53), a rectangular column (54), and an injection device (55). The lifting device (51) includes a hydraulic cylinder a (511) and a tray (512). The hydraulic cylinder a (511) is disposed inside the lower frame (12). The output end of the hydraulic cylinder a (511) extends into the interior of the upper frame (11) and into the tray (55). 12) Connection, the angle limiting device (52) is set on the tray (512), the upper frame (11) is also provided with a support (13), one end of the rectangular column (54) is connected to the bottom of the support (13), the other end of the rectangular column (54) is connected to the position fixing device (53), the injection device (55) is sleeved on the rectangular column (54), the injection device (55) is slidably connected to the rectangular column (54), and the injection device (55) is connected to the bottom of the support (13); The angle limiting device (52) includes a limiting plate (521). The top of the limiting plate (521) is provided with a plurality of grooves a (5211). The bottom of the inner wall of the groove a (5211) is provided with a limiting block (522). The limiting block (522) cooperates with the positioning groove (621) and is inserted into the inside of the positioning groove (621). The bottom of the limiting plate (521) is provided with a protrusion (523). The top of the tray (512) is provided with a rectangular groove (5121) that is the same size and shape as the protrusion (523). The protrusion (523) is inserted into the inside of the rectangular groove (5121). The position fixing device (53) includes a cover plate (531), a vacuum pump (532) and a pipe c (533). The top axis of the cover plate (531) is fixedly connected to the rectangular column (54). The bottom of the cover plate (531) is provided with a number of annular recesses (5313). The cover plate (531) is provided with through holes a (5311) and through holes b (5312) respectively communicating with the recesses (5313). The vacuum pump (532) is located on the top of the support (13). The suction end of the vacuum pump (532) is connected to one end of the pipe c (533), and the other end of the pipe c (533) is connected to the inside of the recesses (5313). The injection device (55) includes a cylinder body (551), a piston (552), a hydraulic cylinder b (553), a hydraulic cylinder c (554), and an injection needle (555). The cylinder body (551) is sleeved on the column of the rectangular column (54) and located directly above the position fixing device (53). The piston (552) is disposed inside the cylinder body (551). One end of the hydraulic cylinder b (553) is connected to the bottom of the support (13). The other end of 53) is connected to the top side of the cylinder body (551), the hydraulic cylinder c (554) is installed on the other side of the top of the cylinder body (551), the output shaft of the hydraulic cylinder c (554) passes through the top of the cylinder body (551) and is connected to the piston (552), the injection needle tube (555) is set at the bottom of the cylinder body (551) and communicates with the inside of the cylinder body (551), and an exhaust needle tube (556) is also provided on the injection needle tube (555). The feeding device (2) is connected to the injection device (5) through pipe b (3), and a solenoid valve (4) is provided on the pipe b (3). The magnetic fluid sensor substrate (6) is disposed inside the filling device (5), which is used to fill the magnetic fluid sensor substrate (6) with magnetic fluid.

2. The magnetohydrodynamic sensor fabrication apparatus according to claim 1, characterized in that: The feeding device (2) includes an air compressor (21), a storage container (22) and a pipe a (23). The air compressor (21) and the storage container (22) are arranged side by side inside the lower frame (12). The airflow output end of the air compressor (21) is connected to the top side of the storage container (22) through the pipe a (23).

3. The magnetohydrodynamic sensor fabrication apparatus according to claim 1, characterized in that: The size and shape of the through hole a (5311) are the same as the size and shape of the fixing ring (64), the size and shape of the through hole b (5312) are the same as the size and shape of the electrode b (63), the through hole a (5311) and the fixing ring (64) are coaxially arranged, and the through hole b (5312) and the electrode b (63) are coaxially arranged.

4. The magnetohydrodynamic sensor fabrication apparatus according to claim 3, characterized in that: The injection needle (555) and the through hole a (5311) are coaxially arranged.

5. The magnetohydrodynamic sensor fabrication apparatus according to claim 2, characterized in that: One end of the pipe b (3) passes through the top of the storage container (22) and extends to the bottom of the inner wall of the storage container (22). The other end of the pipe b (3) is connected to one side of the cylinder (551).

6. The magnetohydrodynamic sensor fabrication apparatus according to claim 1, characterized in that: The limiting block (522) is used to cooperate with the positioning groove (621) to limit the position of the bladder (61) inside the groove a (5211).

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