A Rotating Underwater Digital Encoding Switch Based on Magnetic Sensing

Abstract

The present invention relates to a rotary underwater digital coding switch based on magnetic sensing, which includes a knob assembly and a magnetic detection module respectively located on both sides of a housing; the knob assembly includes a hollow permanent magnet, a knob cap, a plum blossom handle and a knob fixing seat; the knob cap is connected to one end of the plum blossom handle, the other end of the plum blossom handle passes through the knob fixing seat and is connected to the hollow permanent magnet, and the knob fixing seat is fixed to the outside of the housing; when the knob cap is rotated, the knob cap drives the hollow permanent magnet to rotate through the plum blossom handle, and the magnetic detection module detects the magnetic field change of the hollow permanent magnet, so as to convert the rotation angle of the knob cap into a digital coding signal and output it. The knob assembly and the magnetic detection module of the present invention are independent of each other, and are respectively installed inside and outside the equipment housing, without mechanical structure and electrical connection between them, and there is no need to specially waterproof and seal the switch waterproof and sealing structure.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage switches, and in particular to a rotary underwater digital coding switch based on magnetic sensing. Background Art

[0002] With the formal implementation of the strategic goal of building a strong maritime nation, my country's marine industry has ushered in unprecedented development opportunities, and a large number of underwater equipment have been put into use. Among them, some equipment requires the use of switches for function control during underwater operations, such as communication frequency adjustment, volume control, depth and direction control, etc. Therefore, underwater switches are very important for the normal operation of underwater equipment. At the same time, due to the particularity of the underwater working environment, more requirements are put forward for switches, such as higher sealing performance, stronger corrosion resistance and long service life.

[0003] Existing underwater switches mainly include two categories: contact type and non-contact type. Among them, contact switches usually adopt traditional mechanical transmission structures, such as rotating or pressing operations to achieve the switch control of the equipment, but the sealing treatment of its structural parts often adopts O-rings, sealing gaskets or glue filling to maintain waterproofness. Especially for rotary underwater switches, which involve the combined assembly of rotating shafts, sleeves and other components, they usually lead to complex structures, poor sealing performance, low reliability and other problems, and cannot meet the long-term and high-reliability use requirements in complex environments. In addition, the commonly used contact underwater switches also have the problems of high production costs and poor maintainability. Compared with contact underwater switches, non-contact underwater switches are devices that mainly use the principle of magnetic field interaction to achieve equipment switch control. The currently disclosed magnetically controlled underwater switches generally have the characteristics of simple structure and function. Although they can solve the shortcomings of complex structure and poor sealing of the above-mentioned contact switches and achieve the purpose of underwater switch control, they still have some defects and shortcomings. For example, most switches can only realize switch control with a single function and cannot meet the needs of multi-gear control of equipment. Especially for some applications that need to adjust the size of the control amount, there are problems such as poor feasibility, low flexibility of use, and limited scope of use. In addition, there are also disadvantages such as poor versatility and inconvenience in secondary design and development, which makes it difficult to meet people's requirements for multi-functional integrated control. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a magnetic sensor-based rotary underwater digital coding switch with simple structure, reliable sealing, flexible use, simple maintenance and good expansion performance in view of the above-mentioned shortcomings.

[0005] The present invention is achieved through the following technical solutions:

[0006] A magnetic sensing-based rotary underwater digital coding switch comprises a knob assembly and a magnetic detection module correspondingly located on both sides of a housing;

[0007] The knob assembly includes a hollow magnet, a knob cap, a plum blossom handle, and a knob fixing base; the knob cap is connected to one end of the plum blossom handle, the other end of the plum blossom handle passes through the knob fixing base and is connected to the hollow magnet, and the knob fixing base is fixed to the outside of the housing; by rotating the knob cap, the knob cap drives the hollow magnet to rotate via the plum blossom handle, and the magnetic detection module detects the magnetic field change of the hollow magnet, thereby converting the rotation angle of the knob cap into a digital coding signal and outputting it.

[0008] Further, for the rotary underwater digital coding switch based on magnetic sensing, the knob assembly further includes a magnet sleeve, a magnet fixing end cover, and a magnet fixing bolt; a threaded fixing hole is provided at the other end of the plum blossom handle, and the magnet fixing bolt sequentially sleeves the magnet fixing end cover, the hollow magnet, and the magnet sleeve, and is connected to the threaded fixing hole.

[0009] Further, for the rotary underwater digital coding switch based on magnetic sensing, a first wave washer is provided between the knob fixing base and the plum blossom handle, and a second wave washer is provided between the knob fixing base and the magnet sleeve.

[0010] Further, for the rotary underwater digital coding switch based on magnetic sensing, one end of the plum blossom handle is a fixed tooth end, the other end is a rotating optical axis end, and a clamping position portion is provided at the rotating optical axis end; the knob cap is provided with a clamping hole corresponding to and clamped with the fixed tooth end, and the magnet sleeve is provided with a clamping groove corresponding to and clamped with the clamping position portion.

[0011] Further, for the rotary underwater digital coding switch based on magnetic sensing, a diversion groove communicating with its interior is provided on the outside of the knob fixing base, and a pressure relief hole communicating with its interior is provided at the top of the knob cap.

[0012] Further, for the rotary underwater digital coding switch based on magnetic sensing, a sector-shaped limiting block is provided on the outside of the knob fixing base, and a limiting block cooperating with the sector-shaped limiting block is provided on the inner side of the knob cap.

[0013] Further, for the rotary underwater digital coding switch based on magnetic sensing, the magnet sleeve is provided with a groove for embedding the hollow magnet, the hollow magnet is longitudinally nested inside the groove of the magnet sleeve and is pressed by the magnet fixing end cover; the knob fixing base is provided with a groove for embedding the magnet sleeve, and the magnet sleeve together with the hollow magnet and the magnet fixing end cover are longitudinally nested inside the groove of the knob fixing base; a knob counterbore is provided on the outside of the housing, and the part of the knob fixing base provided with the groove is embedded inside the knob counterbore.

[0014] Further, for the rotary underwater digital coding switch based on magnetic sensing, the magnetic detection module includes a magnetic detection circuit and a fixed bracket; the fixed bracket fixes the magnetic detection circuit inside the housing.

[0015] Further, for the rotary underwater digital coding switch based on magnetic sensing, the magnetic detection circuit includes a magnetic induction sensor, and the magnetic induction sensor and the hollow magnetic steel are respectively installed corresponding to both sides of the housing.

[0016] Further, for the rotary underwater digital coding switch based on magnetic sensing, the magnetic detection circuit further includes a power input terminal and a communication serial port output terminal. The power input terminal is respectively connected to VDD and GND, and the 4 signal terminals of the communication serial port output terminal are respectively connected to SDA, SCL, MISO, and MOSI of the SPI interface of other devices.

[0017] The advantages and effects of the present invention are as follows:

[0018] 1. The rotary underwater digital coding switch based on magnetic sensor provided by the present invention, through the electromagnetic isolation between the rotatable knob assembly and the magnetic detection module, uses the magnetic sensor to sense the rotation angle change of the knob assembly in a non-contact manner and output a digital coding signal to meet the requirement of the control quantity size of the device.

[0019] 2. The knob assembly and the magnetic detection module of the rotary underwater digital coding switch based on magnetic sensor provided by the present invention are independent of each other, and are respectively installed inside and outside the device housing, without mechanical structure and electrical connection to each other, and there is no need to specifically perform waterproof sealing treatment on the waterproof sealing structure of the switch.

[0020] 3. The rotary underwater digital coding switch based on magnetic sensor provided by the present invention has a compact structure, reliable sealing, low cost, convenient installation, disassembly and maintenance, and can provide digital coding signals, with certain universality and engineering application value. Description of the Drawings

[0021] Figure 1 Showing the structural schematic diagram of the rotary underwater digital coding switch provided by the present invention;

[0022] Figure 2 Showing the structural split schematic diagram of the rotary underwater digital coding switch provided by the present invention;

[0023] Figure 3 Showing the cross-sectional view after installation of the rotary underwater digital coding switch provided by the present invention;

[0024] Figure 4 Showing the structural split schematic diagram of the knob assembly of the rotary underwater digital coding switch provided by the present invention;

[0025] Figure 5 Show Figure 4 Schematic structural diagram of the knob fixing base of the knob assembly in

[0026] Figure 6 Show Figure 4 Schematic structural diagram of the knob cap of the knob assembly in

[0027] Figure 7 Show Figure 4 Schematic structural diagram of the magnetic steel sleeve of the knob assembly in

[0028] Figure 8 Show Figure 4 Schematic structural diagram of the plum blossom handle of the knob assembly in

[0029] Figure 9 Show the schematic structural breakdown diagram of the magnetic detection module of the rotary underwater digital coding switch provided by the present invention;

[0030] Figure 10 Show Figure 9 Schematic structural diagram of the magnetic detection circuit of the magnetic detection module in

[0031] Explanation of reference numerals: 1 - knob assembly, 2 - knob counterbore, 3 - housing, 4 - magnetic detection module, 5 - magnetic detection fixing bolt, 6 - knob fixing threaded hole, 7 - knob fixing bolt, 8 - knob cap, 9 - plum blossom handle, 10 - first wave washer, 100 - second wave washer, 11 - knob fixing base, 12 - magnetic steel sleeve, 13 - hollow magnetic steel, 14 - magnetic steel fixing end cap, 15 - magnetic steel fixing bolt, 16 - magnetic detection circuit fixing bolt, 17 - magnetic detection circuit, 18 - fixing boss, 19 - fixing bracket, 20 - lead opening, 21 - magnetic detection circuit fixing threaded hole, 22 - magnetic detection fixing through hole, 23 - magnetic induction sensor, 24 - magnetic detection fixing threaded hole, 25 - plum blossom handle fixing threaded hole, 26 - pressure relief hole, 27 - flat indentation, 28 - clamping hole, 29 - limiting block, 30 - positioning shaft hole, 31 - limiting block, 32 - knob fixing through hole, 33 - diversion groove, 34 - clamping groove, 35 - fixing tooth end, 36 - clamping part, 37 - optical axis end, 38 - communication serial port output end, 39 - semi-open clamping hole, 40 - power input end. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the present invention more clear, the following describes the technical solutions in the embodiments of the present invention in more detail with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention. The following describes the embodiments of the present invention in detail with reference to the accompanying drawings:

[0033] In the description of the present invention, it should be understood that unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the scope of protection of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance. In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Figures 1 to 3 The structural schematic diagram of the rotary underwater digital coding switch provided by the present invention is shown. The underwater digital coding switch includes a knob assembly 1 and a magnetic detection module 4 correspondingly located on both sides of the housing 3. Figure 4Shows a schematic diagram of the structural disassembly of the knob assembly of the rotary underwater digital coding switch provided by the present invention. The knob assembly 1 includes a hollow magnet 13, a knob cap 8, a plum blossom handle 9, and a knob fixing base 11. The knob cap 8 is connected to one end of the plum blossom handle 9, and the other end of the plum blossom handle 9 passes through the knob fixing base 11 and is connected to the hollow magnet 13. Rotating the knob cap 8, the knob cap 8 drives the hollow magnet 13 to rotate through the plum blossom handle 9, and the magnetic detection module 4 detects the magnetic field change of the hollow magnet 13, thereby converting the rotation angle of the knob cap 8 into a digital coding signal and outputting it. Specifically, the knob assembly 1 is fixedly installed on the outside of the housing 3, and the magnetic detection module 4 is fixedly installed on the inside of the housing 3. The relative positions between the knob assembly 1 and the magnetic detection module 4 are fixed, forming a complete knob switch. The housing 3 is both the installation base connecting the knob assembly 1 and the magnetic detection module 4 and a part of the underwater equipment housing.

[0035] Specifically, a plum blossom handle 9 is longitudinally provided at the central position of the knob assembly 1. Rotating the knob cap 8 can rotate around the longitudinal axis where the plum blossom handle 9 is located, and drive the hollow magnet 13 to rotate together through the plum blossom handle 9. The knob fixing base 11 is fixed to the outside of the housing 3. Specifically, 4 knob fixing through holes 32 are evenly arranged on the periphery of the knob fixing base 11 of the knob assembly 1, and 4 knob fixing threaded holes 6 are opened on the outside of the housing 3. The knob assembly 1 is fixedly installed on the outside of the housing 3 by cooperating 4 knob fixing bolts 7 with 4 knob fixing through holes 32 and 4 knob fixing threaded holes 6. As Figure 5 shown, a positioning shaft hole 30 is provided at the center of the knob fixing base 11, and the plum blossom handle 9 passes through the positioning shaft hole 30 and is connected to the hollow magnet 13.

[0036] The knob assembly 1 further includes a magnet sleeve 12, a magnet fixing end cover 14, and a magnet fixing bolt 15. A plum blossom handle fixing threaded hole 25 is provided at the other end of the plum blossom handle 9. The magnet fixing bolt 15 is sequentially sleeved with the magnet fixing end cover 14, the hollow magnet 13, and the magnet sleeve 12, and is connected to the plum blossom handle fixing threaded hole 25. Specifically, as Figure 8 shown, one end of the plum blossom handle 9 is a fixed tooth end 35, and the other end is a smooth shaft end 37. A clamping position portion 36 is provided at the smooth shaft end 37. As Figure 6 shown, the knob cap 8 is provided with a clamping hole 28 corresponding to the fixed tooth end 35 for clamping, and the knob cap 8 is longitudinally clamped on the fixed tooth end 35 of the plum blossom handle 9. As Figure 7 shown, the magnet sleeve 12 is provided with a clamping groove 34 corresponding to the clamping position portion 36. The above structure limits the relative movement between the knob cap 8 and the plum blossom handle 9, and between the plum blossom handle 9 and the magnet sleeve 12, so as to ensure that the knob cap 8, the plum blossom handle 9, the magnet sleeve 12, the hollow magnet 13, and the magnet fixing end cover 14 move together.

[0037] As Figure 3As shown, the magnet steel sleeve 12 is arranged to be embedded in the groove of the hollow magnet steel 13. The hollow magnet steel 13 is longitudinally nested inside the groove of the magnet steel sleeve 12 and is pressed by the magnet steel fixing end cover 14. The knob fixing seat 11 is arranged to be embedded in the groove of the magnet steel sleeve 12. The magnet steel sleeve 12 together with the hollow magnet steel 13 and the magnet steel fixing end cover 14 is longitudinally nested inside the groove of the knob fixing seat 11. A knob counterbore 2 (blind hole) is arranged on the outer side of the housing 3. The part of the knob fixing seat 11 with the groove can be embedded in the knob counterbore 2. As Figure 4 shown, a first wave washer 10 is arranged between the knob fixing seat 11 and the plum blossom handle 9, and a second wave washer 100 is arranged between the knob fixing seat 11 and the magnet steel sleeve 12. Through the pre-pressing force of the magnet steel sleeve 12 and the plum blossom handle 9, the elastic force of the wave washer is tightly pressed on both the inner and outer sides of the knob fixing seat 11, so that the connection between the plum blossom handle 9 and the knob fixing seat 11 in the axial direction is tighter and more firm. Through the axial pressing of the elastic force, a frictional force is generated between the plum blossom handle 9 and the knob fixing seat 11, so that the knob assembly 1 will not easily shake during use or will not cause unstable rotation due to the shaking of the device, avoiding the output of incorrect encoded signals due to the slip of the rotation angle. Specifically, the optical axis end 37 of the plum blossom handle 9 is sleeved with the first wave washer 10 and then passes through the positioning shaft hole 30, and then is sleeved with the second wave washer 100 and clamped in the clamping groove 34. The magnet steel fixing bolt 15 sequentially passes through the magnet steel fixing end cover 14, the hollow magnet steel 13 and the magnet steel sleeve 12 and is connected to the plum blossom handle fixing threaded hole 25 to fix the hollow magnet steel 13 and the plum blossom handle 9 together.

[0038] As Figure 5 shown, a diversion groove 33 communicating with its interior is arranged on the outer side of the knob fixing seat 11. As Figure 6 shown, a pressure relief hole 26 communicating with its interior is arranged at the top of the knob cap 8. The diversion groove 33 cooperates with the pressure relief hole 26 to relieve the pressure inside after the switch discharges water, effectively solving the problem that the water accumulated inside the knob cap 8 cannot be quickly discharged. As Figure 3 shown, a flat indentation 27 is arranged at the top edge of the knob cap 8, which is an indication mark for the rotation angle of the knob assembly.

[0039] As Figure 5 shown, a sector-shaped limit block 31 is arranged on the outer side of the knob fixing seat 11. As Figure 6 shown, a limit stop block 29 that cooperates with the sector-shaped limit block 31 is arranged on the inner side of the knob cap 8. The cooperation between the limit stop block 29 and the sector-shaped limit block 31 realizes the control of the rotation angle stroke of the knob cap 8. The length of the sector area of the sector-shaped limit block 31 can be set according to actual application needs, that is, the rotation angle range of the knob cap 8 is limited by setting the size of the sector of the sector-shaped limit block 31.

[0040] Figure 9Shows a schematic diagram of the structural disassembly of the magnetic detection module of the rotary underwater digital coding switch provided by the present invention. The magnetic detection module 4 includes a magnetic detection circuit 17 and a fixing bracket 19. The fixing bracket 19 fixes the magnetic detection circuit 17 inside the housing 3. Specifically, semi-open clamping holes 39 are provided on both the left and right sides of the magnetic detection circuit 17, and fixing threaded holes 21 are provided on two fixing bosses 18 corresponding to the positions of the fixing bracket 19. The semi-open clamping holes 39 cooperate with the fixing bosses 18 to clamp the magnetic detection circuit 17 onto the fixing bracket 19, and then the magnetic detection circuit 17 is fixedly installed on the fixing bracket 19 through two magnetic detection circuit fixing bolts 16. One magnetic detection fixing through hole 22 is provided on each of the upper and lower parts of the fixing bracket 19 of the magnetic detection module 4, and two magnetic detection fixing threaded holes 24 are provided on the inner side of the housing 3 corresponding to the positions. The magnetic detection module 4 is fixed to the inner side of the housing 3 through the cooperation of two magnetic detection fixing bolts 5 with two magnetic detection fixing through holes 22 and two magnetic detection fixing threaded holes 24. The magnetic detection circuit 17 includes a magnetic induction sensor 23, and the magnetic induction sensor 23 and the hollow permanent magnet 13 are respectively installed corresponding to both sides of the housing 3. Specifically, in the spatial layout, the knob assembly 1 is located directly above the magnetic detection circuit 17 of the magnetic detection module 4, and the distance between the two is related to the thickness of the housing 3 and needs to be limited within a certain range to ensure the best magnetic field detection effect. The magnetic induction sensor 23 is arranged at the exact middle position of the magnetic detection circuit 17, and can effectively detect the magnetic field change of the hollow permanent magnet 13 in the knob assembly 1. Larger lead openings 20 are symmetrically provided on both the upper and lower sides of the fixing bracket 19 to facilitate the signal wires of the wiring terminals of the magnetic detection circuit 17 to be led out to the underwater device control circuit.

[0041] As Figure 10 shown, the magnetic detection circuit 17 further includes a power input terminal 40 and a communication serial port output terminal 38. The power input terminal 40 is respectively connected to VDD (3V - 5V) and GND, and the four signal terminals of the communication serial port output terminal 38 are respectively connected to SDA, SCL, MISO, and MOSI of the SPI interface of other devices.

[0042] The working process of the rotary underwater digital coding switch is as follows:

[0043] When the knob cap 8 is rotated under the action of an external force, the rotation of the knob cap 8 needs to overcome the frictional forces generated by the first corrugated washer 10 and the second corrugated washer 100, and the hollow permanent magnet 13 integral with it also rotates clockwise or counterclockwise by a certain stroke angle. The magnetic detection circuit 17 fixed inside the housing 3 can detect the magnetic field change generated by the hollow permanent magnet 13 and outputs a digital coding signal through the output end 38 of the serial communication interface. These digital coding signals are the corresponding clockwise or counterclockwise rotation angle information, and these digital coding signals are transmitted to the underwater equipment control circuit, and the set switch control function is realized by processing the coding signals. After the external force on the knob cap 8 disappears, the knob cap 8 will remain in the current rotation position under the action of the frictional force generated between the corrugated washer 10 and the knob fixing seat 11.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention and are not used to limit the implementation scope of the present invention. Any equivalent changes and modifications made within the protection scope of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. A rotary underwater digital coding switch based on magnetic sensing, characterized in that, It includes a knob assembly (1) and a magnetic detection module (4) respectively located on both sides of a housing (3); The knob assembly (1) includes a hollow permanent magnet (13), a knob cap (8), a plum blossom handle (9) and a knob fixing seat (11); the knob cap (8) is connected to one end of the plum blossom handle (9), the other end of the plum blossom handle (9) passes through the knob fixing seat (11) and is connected to the hollow permanent magnet (13), and the knob fixing seat (11) is fixed to the outside of the housing (3); when the knob cap (8) is rotated, the knob cap (8) drives the hollow permanent magnet (13) to rotate through the plum blossom handle (9), and the magnetic detection module (4) detects the magnetic field change of the hollow permanent magnet (13), so as to convert the rotation angle of the knob cap (8) into a digital coding signal and output it; The knob assembly (1) further includes a magnet sleeve (12), a permanent magnet fixing end cap (14) and a permanent magnet fixing bolt (15); a plum blossom handle fixing threaded hole (25) is provided at the other end of the plum blossom handle (9), and the permanent magnet fixing bolt (15) sequentially sleeved with the permanent magnet fixing end cap (14), the hollow permanent magnet (13) and the magnet sleeve (12) is connected to the plum blossom handle fixing threaded hole (25); A first wave washer (10) is provided between the knob fixing seat (11) and the plum blossom handle (9), and a second wave washer (100) is provided between the knob fixing seat (11) and the magnet sleeve (12); The magnet sleeve (12) is provided with a groove for embedding the hollow permanent magnet (13), the hollow permanent magnet (13) is longitudinally nested in the groove of the magnet sleeve (12) and is pressed by the permanent magnet fixing end cap (14); the knob fixing seat (11) is provided with a groove for embedding the magnet sleeve (12), and the magnet sleeve (12) together with the hollow permanent magnet (13) and the permanent magnet fixing end cap (14) is longitudinally nested in the groove of the knob fixing seat (11); a knob counterbore (2) is provided on the outside of the housing (3), and the part of the knob fixing seat (11) provided with the groove is embedded in the knob counterbore (2).

2. The rotary underwater digital coding switch based on magnetic sensing according to claim 1, characterized in that, One end of the plum blossom handle (9) is a fixed tooth end (35), the other end is a smooth shaft end (37), and a clamping position part (36) is provided at the smooth shaft end (37); the knob cap (8) is provided with a clamping hole (28) corresponding to the fixed tooth end (35) for clamping, and the magnet sleeve (12) is provided with a clamping groove (34) corresponding to the clamping position part (36) for clamping.

3. The rotary underwater digital coding switch based on magnetic sensing according to claim 1, characterized in that, A diversion groove (33) communicating with its inside is provided on the outside of the knob fixing seat (11), and a pressure relief hole (26) communicating with its inside is provided at the top of the knob cap (8).

4. The rotary underwater digital coding switch based on magnetic sensing according to claim 1, characterized in that, A sector-shaped limit block (31) is provided on the outside of the knob fixing seat (11), and a limit stop block (29) cooperating with the sector-shaped limit block (31) is provided on the inside of the knob cap (8).

5. The rotary underwater digital coding switch based on magnetic sensing according to claim 1, characterized in that, The magnetic detection module (4) includes a magnetic detection circuit (17) and a fixing bracket (19); the fixing bracket (19) fixes the magnetic detection circuit (17) to the inside of the housing (3).

6. The rotary underwater digital coding switch based on magnetic sensing according to claim 5, characterized in that, The magnetic detection circuit (17) includes a magnetic induction sensor (23), and the magnetic induction sensor (23) and the hollow permanent magnet (13) are respectively installed corresponding to both sides of the housing (3).

7. The rotary underwater digital coding switch based on magnetic sensing according to claim 6, characterized in that, The magnetic detection circuit (17) further includes a power input terminal (40) and a communication serial port output terminal (38). The power input terminal (40) is respectively connected to VDD and GND, and the four signal terminals of the communication serial port output terminal (38) are respectively connected to SDA, SCL, MISO, and MOSI of the SPI interface of other devices.

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