CN110657825B - Waterproof, anticorrosion and dustproof magneto-sensitive angular displacement sensor - Google Patents
Waterproof, anticorrosion and dustproof magneto-sensitive angular displacement sensor Download PDFInfo
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- CN110657825B CN110657825B CN201910922001.4A CN201910922001A CN110657825B CN 110657825 B CN110657825 B CN 110657825B CN 201910922001 A CN201910922001 A CN 201910922001A CN 110657825 B CN110657825 B CN 110657825B
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 36
- 238000007789 sealing Methods 0.000 claims abstract description 403
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 238000005260 corrosion Methods 0.000 claims abstract description 19
- 239000004519 grease Substances 0.000 claims description 48
- 238000007493 shaping process Methods 0.000 claims description 20
- 239000000428 dust Substances 0.000 claims description 19
- 239000003822 epoxy resin Substances 0.000 claims description 16
- 229920000647 polyepoxide Polymers 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 230000007797 corrosion Effects 0.000 claims description 10
- 230000006698 induction Effects 0.000 claims description 9
- 229920002379 silicone rubber Polymers 0.000 claims description 9
- 239000013013 elastic material Substances 0.000 claims description 7
- 238000001746 injection moulding Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 235000009165 saligot Nutrition 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 claims 1
- 244000017160 saligot Species 0.000 claims 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 4
- 240000001085 Trapa natans Species 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000004945 silicone rubber Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
- G01D11/26—Windows; Cover glasses; Sealings therefor
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- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The invention discloses a water-proof, corrosion-proof and dust-proof magnetic-sensitive angular displacement sensor, which comprises magnetic steel, a printed circuit board assembly, a shaft, an upper sealing cover, a shell and a lower sealing cover, wherein the shaft is arranged in the shell in a rotating fit manner, and the top end of the shaft penetrates through the upper sealing cover; the upper part of the shell is provided with a sealing cavity, the sealing cavity of the shell is provided with a sealing part in a matched manner, and the lower part of the shell is provided with a bearing B matched with the shaft; the middle part of the magnetic field cavity B of the lower sealing cover is provided with a bearing A, and the bottom end of the shaft is arranged in the bearing A in a rotating fit manner; the shaft is fixed with the base outside, and the base bottom is equipped with the magnet steel, and lower sealed lid is fixed with printed circuit board subassembly, and lower sealed cover is last to run through and be equipped with the lead wire that is connected with printed circuit board subassembly electricity. The invention completely seals the magnetic steel and the printed circuit board assembly respectively, thereby realizing the waterproof, anti-corrosion and dustproof functions of components, chips and shaft rotating parts in the printed circuit board assembly, and simultaneously still having the advantages of high precision, high resolution and good reliability under severe environments.
Description
Technical Field
The invention relates to a magnetic-sensing angular displacement sensor, in particular to a waterproof, anti-corrosion and dustproof magnetic-sensing angular displacement sensor.
Background
The angular displacement sensor is used for detecting the angular position, feeding back the absolute angular position of the servo system, and completing the functions of closed-loop control, angular position monitoring and the like of the upper computer. Most of the shafts of the existing angular displacement sensor are of rotating structures, the rotating parts do not have waterproof, anti-corrosion and dustproof effects, if the angular displacement sensor is placed in water, wet and dust environments, water enters between the shafts and the bearings due to gaps to cause short circuit of the sensor circuit, and even dust enters the inside of the bearing balls to easily cause the phenomenon of bearing clamping stagnation or clamping.
The magneto-dependent angular displacement sensor is also used for angular displacement measurement of the servo motor and feeds back the absolute angular position of the servo motor. The magnetic-sensitive angular displacement sensor has the advantages of high precision, high resolution, good reliability and the like, and the magnetic-sensitive angular displacement sensor has the functions of water resistance, corrosion resistance and dust resistance, so that the magnetic-sensitive angular displacement sensor still has the advantages of high precision, high resolution and good reliability under severe environments.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the waterproof, anti-corrosion and dustproof magnetic-sensitive angular displacement sensor, solves the problems of water resistance, corrosion resistance and dust resistance of the rotating shaft part of the angular displacement sensor, adopts a non-contact magnetic induction technology, and completely seals the magnetic steel, the printed circuit board assembly and the rotating shaft part respectively by the structure, thereby realizing the waterproof, anti-corrosion and dust resistance of components, chips and the rotating shaft part in the printed circuit board assembly, and simultaneously still has the advantages of high precision, high resolution and good reliability under severe environments.
The aim of the invention is achieved by the following technical scheme:
The magnetic-sensitive angular displacement sensor comprises magnetic steel, a printed circuit board assembly, a shaft, an upper sealing cover, a shell and a lower sealing cover, wherein the upper sealing cover is arranged at the top of the shell in a sealing way, the lower sealing cover is arranged at the bottom of the shell in a sealing way, the shaft is arranged in the shell in a rotating fit way, and the top end of the shaft penetrates through the upper sealing cover; the upper part of the shell is provided with a sealing cavity matched with the shaft, the lower part of the shell is provided with a bearing mounting groove A, a sealing part matched with the shaft is arranged in the sealing cavity of the shell in a matched manner, and a bearing B matched with the shaft is arranged in the bearing mounting groove A of the shell in a matched manner; the shell is provided with a magnetic field cavity A below the bearing mounting groove A, the lower sealing cover is provided with a magnetic field cavity B matched with the magnetic field cavity A, the magnetic field cavity A and the magnetic field cavity B jointly form a magnetic induction cavity, the middle part of the magnetic field cavity B of the lower sealing cover is concavely provided with a bearing mounting groove B, the bearing mounting groove B of the lower sealing cover is internally provided with a bearing A, and the bottom end of the shaft is rotatably matched with the bearing A; the bearing is characterized in that a base positioned in the bearing mounting groove A is fixed on the outer portion of the shaft, magnetic steel is arranged at the bottom of the base, a printed circuit board assembly positioned in the magnetic field cavity B is fixed on the lower sealing cover, and a lead wire electrically connected with the printed circuit board assembly is arranged on the lower sealing cover in a penetrating mode.
In order to better realize the invention, the sealing part comprises a sealing lip gasket and an elastic sealing lip cover, the sealing lip gasket is in a circular ring shape as a whole, and the inner side of the sealing lip gasket is provided with a cone part; the elastic sealing lip cover is in an annular shape, the elastic sealing lip cover is sleeved on the sealing lip pad from the inner side to the outer side of the sealing lip pad, the inner side of the elastic sealing lip cover is provided with a cone tip part, and the cone tip part of the elastic sealing lip cover is tightly attached to the outer side of the shaft; the top of the elastic sealing lip cover is provided with a sealing gasket A, the top of the sealing gasket A is provided with an elastic sealing sheet A, the bottom of the elastic sealing lip cover is provided with an arc-shaped shaping sheet, the bottom of the arc-shaped shaping sheet is provided with an elastic sealing sheet B, and the bottom of the elastic sealing sheet B is provided with a sealing gasket B.
Preferably, the cone tip portion of the elastic lip cover and the cone portion of the seal lip gasket have a buffer clearance space.
Preferably, the bottom surface of the sealing gasket B is a plane matched with the bottom of the sealing cavity of the shell, the top surface of the sealing gasket B is an arc curved surface, the bottom surface of the elastic sealing gasket B is an arc curved surface matched with the top surface of the sealing gasket B, the top surface of the elastic sealing gasket B is an arc curved surface, the bottom surface of the arc shaping sheet is an arc curved surface matched with the top surface of the elastic sealing gasket B, and the top surface of the arc shaping sheet is an arc curved surface matched with the lower contour surface of the elastic sealing lip cover.
Preferably, the bottom surface of the sealing gasket A is an arc curved surface matched with the upper contour surface of the elastic sealing lip cover, the top surface of the sealing gasket A is an arc curved surface, the bottom surface of the elastic sealing gasket A is an arc curved surface matched with the top surface of the sealing gasket A, and the top surface of the elastic sealing gasket A is an arc curved surface.
Preferably, the gap space between the top surface of the elastic sealing piece A and the upper sealing cover is a sealing grease cavity A, the gap space between the bottom surface of the elastic sealing piece A, the side surface of the sealing gasket A and the upper profile surface of the elastic sealing lip cover is a sealing grease cavity B, the gap space between the side surface of the arc-shaped shaping piece, the lower profile surface of the elastic sealing lip cover and the top surface of the elastic sealing piece B is a sealing grease cavity C, the gap space between the side surface of the sealing gasket B and the bottom surface of the elastic sealing piece B is a sealing grease cavity D, and the sealing grease cavity A, the sealing grease cavity B, the sealing grease cavity C and the sealing grease cavity D are respectively filled with sealing grease.
Preferably, the base is fixedly arranged outside the shaft through a stop ring, the base and the shaft are also fixedly stuck through epoxy resin, the magnetic steel and the base are fixedly stuck through epoxy resin, and a magnetic steel sealing cover matched with the magnetic steel is arranged below the base; the lower sealing cover is provided with a printed board groove, the printed circuit board assembly is fixed in the printed board groove through epoxy bonding, the lower sealing cover is provided with a printed board sealing cover matched with the printed circuit board assembly, the lower sealing cover is fixed with the bottom of the shell through laser seal welding, the top of the shell is fixed with the upper sealing cover through screws, the upper sealing cover and the water caltrop of the shell are provided with sealing grooves, and elastic silicon rubber is arranged in the sealing grooves.
Preferably, the elastic sealing piece B, the elastic sealing lip cover and the elastic sealing piece A are all formed by injection molding of elastic materials, and the surfaces of the elastic sealing piece B, the elastic sealing lip cover and the elastic sealing piece A are smooth and have certain elasticity.
Preferably, the lower sealing cover is provided with a wire outlet hole in a penetrating mode, the lead penetrates through the wire outlet hole of the lower sealing cover, and silicone rubber is filled between the lead and the wire outlet hole of the lower sealing cover in a sealing mode.
Compared with the prior art, the invention has the following advantages:
(1) The invention solves the problems of water resistance, corrosion resistance and dust prevention of the rotating shaft part of the angular displacement sensor; the magnetic steel and the printed circuit board assembly are completely sealed by adopting a non-contact magnetic induction technology, so that the components and chips in the printed circuit board assembly are waterproof, anti-corrosion and dustproof, and the linear precision, the service life and the sensitivity of the product are not reduced; the magneto-dependent angular displacement sensor still has the advantages of high precision, high resolution and good reliability under severe environments.
(2) According to the invention, the waterproof, dustproof and anti-corrosion functions between the rotating shaft of the angular displacement sensor and the shell are realized by using the structures of the upper sealing cover, the elastic sealing sheet A, the sealing gasket A, the sealing lip gasket, the elastic sealing lip cover, the shaping sheet, the elastic sealing gasket B, the shell and the sealing grease.
(3) The invention adopts a non-contact magnetic induction technology, and the structure adopts the magnetic steel sealing cover and the printed board sealing cover to respectively and completely seal the magnetic steel and the printed circuit board assembly, thereby realizing the waterproof, anti-corrosion and dustproof effects of components and chips in the printed circuit board assembly without affecting the linear precision, the service life and the sensitivity of the product.
(4) The magnetic steel sealing cover and the printed board sealing cover adopt non-magnetic conductive metal materials, the printed circuit board assembly can sense the magnetic field of the magnetic steel, and the magnetic field is not shielded and demagnetized.
(5) The invention adopts a non-contact magnetic induction technology, and the magnetic steel and the printed circuit board assembly are suspended, so that the linear precision, the service life and the sensitivity of the product are not affected after the sealing.
Drawings
FIG. 1 is a schematic diagram of a magnetically sensitive angular displacement sensor according to the present invention;
FIG. 2 is a schematic view of a lead layout structure of the lower seal cap;
FIG. 3 is an enlarged partial schematic view of the seal;
FIG. 4 is a view showing the outer shape of the elastic sealing plate in an operating state;
FIG. 5 is a cross-sectional view of an elastomeric sealing panel;
FIG. 6 is a cross-sectional view of a seal lip gasket;
fig. 7 is a cross-sectional view of the elastomeric seal lip cover.
Wherein, the names corresponding to the reference numerals in the drawings are:
1-shaft, 2-upper sealing cover, 3-shell, 4-base, 5-magnetic steel, 6-lower sealing cover, 7-printed circuit board assembly, 8-lead, 81-wire hole, 9-bearing A, 10-printed board sealing cover, 11-magnetic steel sealing cover, 12-bearing B, 13-sealing part, 131-sealing gasket A, 132-elastic sealing piece A, 133-sealing lip gasket, 134-elastic sealing piece B, 135-sealing gasket B, 136-elastic sealing lip cover, 137-arc-shaped shaping piece, 138-sealing grease and 14-screw.
Detailed Description
The invention is further illustrated by the following examples:
Example 1
As shown in fig. 1 to 7, the water-proof, corrosion-proof and dust-proof magnetic-sensitive angular displacement sensor comprises magnetic steel 5, a printed circuit board assembly 7, a shaft 1, an upper sealing cover 2, a housing 3 and a lower sealing cover 6, wherein the upper sealing cover 2 is arranged at the top of the housing 3 in a sealing manner, the lower sealing cover 6 is arranged at the bottom of the housing 3 in a sealing manner, the shaft 1 is arranged in the housing 3 in a rotating fit manner, and the top end of the shaft 1 penetrates through the upper sealing cover 2. The upper part of the shell 3 is provided with a sealing cavity matched with the shaft 1, the lower part of the shell 3 is provided with a bearing installation groove A, a sealing part 13 matched with the shaft 1 is arranged in the sealing cavity of the shell 3 in a matched manner, and a bearing B12 matched with the shaft 1 is arranged in the bearing installation groove A of the shell 3 in a matched manner. The shell 3 is located bearing mounting groove A below and is equipped with magnetic field chamber A, and lower sealed lid 6 is opened and is had magnetic field chamber B with magnetic field chamber A matched with, and magnetic field chamber A constitutes the magnetic induction chamber jointly with magnetic field chamber B, and lower sealed lid 6 is sunken to open at magnetic field chamber B middle part has bearing mounting groove B, installs bearing A9 in the bearing mounting groove B of lower sealed lid 6, and the rotation fit of axle 1 bottom is installed in bearing A9. The shaft 1 is externally fixed with a base 4 positioned in a bearing mounting groove A, magnetic steel 5 is arranged at the bottom of the base 4, a lower sealing cover 6 is fixed with a printed circuit board assembly 7 positioned in a magnetic field cavity B, and a lead 8 electrically connected with the printed circuit board assembly 7 is arranged on the lower sealing cover 6 in a penetrating manner.
As shown in fig. 3, the seal portion 13 includes a seal lip 133 and an elastic seal lip cover 136, the seal lip 133 has an annular shape as a whole, and a tapered portion is provided inside the seal lip 133. The elastic sealing lip cover 136 is in a circular ring shape as a whole, the elastic sealing lip cover 136 is sleeved on the sealing lip pad 133 from the inner side to the outer side of the sealing lip pad 133, the inner side of the elastic sealing lip cover 136 is provided with a cone tip part, and the cone tip part of the elastic sealing lip cover 136 is tightly attached to the outer side of the shaft 1. The top of the elastic sealing lip cover 136 is provided with a sealing gasket A131, the top of the sealing gasket A131 is provided with an elastic sealing sheet A132, the bottom of the elastic sealing lip cover 136 is provided with an arc-shaped shaping sheet 137, the bottom of the arc-shaped shaping sheet 137 is provided with an elastic sealing sheet B134, and the bottom of the elastic sealing sheet B134 is provided with a sealing gasket B135. The cone tip of the elastic lip cover 136 and the cone of the lip gasket 133 of the present invention have a buffer clearance space; when the shaft 1 rotates, the cone tip part of the elastic sealing lip cover 136 is matched and clung to the outer side of the shaft 1, meanwhile, a proper amount of lubricating oil is coated at the contact position of the cone tip part of the elastic sealing lip cover 136 and the shaft 1 so as to reduce friction force between the shaft 1 and the elastic sealing lip cover 136, and the buffer clearance space is matched with the outer side of the shaft 1 in a self-adaptive sealing way, so that the dynamic sealing performance of the shaft 1 in the rotating process is improved.
As shown in fig. 3, the bottom surface of the sealing gasket B135 is a plane matched with the bottom of the sealing cavity of the housing 3, and the top surface of the sealing gasket B135 is a circular arc curved surface. As shown in fig. 4, the bottom surface of the elastic sealing piece B134 is an arc curved surface matched with the top surface of the sealing gasket B135, the top surface of the elastic sealing piece B134 is an arc curved surface, the bottom surface of the arc shaping piece 137 is an arc curved surface matched with the top surface of the elastic sealing piece B134, and the top surface of the arc shaping piece 137 is an arc curved surface matched with the lower contour surface of the elastic sealing lip cover 136. As shown in fig. 3, the bottom surface of the sealing gasket a131 is an arc curved surface matching with the upper contour surface of the elastic sealing lip cover 136, and the top surface of the sealing gasket a131 is an arc curved surface. As shown in fig. 4, the bottom surface of the elastic sealing piece a132 is an arc curved surface matched with the top surface of the sealing gasket a131, and the top surface of the elastic sealing piece a132 is an arc curved surface.
As shown in fig. 3 and 4, the gap space between the top surface of the elastic sealing piece a132 and the upper sealing cover 2 is a grease sealing cavity a, the gap space between the bottom surface of the elastic sealing piece a132, the side surface of the sealing gasket a131 and the upper contour surface of the elastic sealing lip cover 136 is a grease sealing cavity B, the gap space between the side surface of the arc-shaped shaping piece 137, the lower contour surface of the elastic sealing lip cover 136 and the top surface of the elastic sealing piece B134 is a grease sealing cavity C, and the gap space between the side surface of the sealing gasket B135 and the bottom surface of the elastic sealing piece B134 is a grease sealing cavity D, and the grease sealing cavity a, the grease sealing cavity B, the grease sealing cavity C and the grease sealing cavity D are filled with grease sealing 138 respectively. The elastic sealing piece B134, the elastic sealing lip cover 136 and the elastic sealing piece A132 are preferably made of elastic materials through injection molding, and the surfaces of the elastic sealing pieces are smooth and have certain elasticity.
The base 4 is fixedly arranged outside the shaft 1 through a stop ring, the base 4 and the shaft 1 are also fixedly pasted through epoxy resin, the magnetic steel 5 and the base 4 are fixedly pasted through epoxy resin, and a magnetic steel sealing cover 11 matched with the magnetic steel 5 is arranged below the base 4. The lower sealing cover 6 is provided with a printed board groove, the printed circuit board assembly 7 is fixed in the printed board groove through epoxy resin bonding, the lower sealing cover 6 is provided with a printed board sealing cover 10 matched with the printed circuit board assembly 7, the lower sealing cover 6 is fixed with the bottom of the shell 3 through laser seal welding, the top of the shell 3 is fixed with the upper sealing cover 2 through a screw 14, the water caltrop positions of the upper sealing cover 2 and the shell 3 are provided with sealing grooves, and elastic silicon rubber is arranged in the sealing grooves.
As shown in fig. 2, the lower sealing cover 6 is provided with a wire outlet hole 81 in a penetrating manner, the lead 8 passes through the wire outlet hole of the lower sealing cover 6, and silicone rubber is filled between the lead 8 and the wire outlet hole 81 of the lower sealing cover 6.
The working principle of this embodiment is as follows:
When the magnetic field sensor is used, the printed circuit board assembly 7 and the lower sealing cover 6 are fixed relatively, the servo system rotates to drive the shaft 1 to rotate, the shaft 1 rotates to drive the magnetic steel 5 on the base 4 to rotate, the magnetic steel 5 and the printed circuit board assembly 7 generate relative angular displacement movement, and the printed circuit board assembly 7 converts magnetic field signals into hexadecimal angular displacement signals of corresponding communication protocols to be output. Because the elastic sealing piece B134, the elastic sealing lip cover 136 and the elastic sealing piece A132 are made of elastic materials by injection molding, the elastic sealing piece B134, the elastic sealing lip cover 136 and the elastic sealing piece A132 are in close contact with the shaft 1 when rotating and have no gap; the sealing part 13 is internally filled with sealing grease 138, and the sealing grease 138 has the functions of low fluidity, difficult flow, lubrication and dust prevention. When water or dust invades from the gap between the shaft 1 and the upper sealing cover plate 2, the position of the elastic sealing sheet A132 is restrained by the curved surface shape of the sealing sheet A131, meanwhile, the elastic sealing lip cover 136 is tightly attached to the shaft 1 in the 360-degree direction, the elastic sealing gasket B134 is restrained by the curved surface shape of the sealing gasket B135, and the sealing grease fills all gap spaces, and the sealing grease is sealed by the upper sealing cover 2, the elastic sealing gasket A132, the elastic sealing lip cover 136, the elastic sealing sheet B134 and the shell 3, and has poor fluidity but lubrication effect because of the poor fluidity of the sealing grease, so that the sealing grease cannot overflow from the gaps between the upper sealing cover 2 and the shaft 1 and between the shell 3 and the shaft 1, the sealing grease plays a role of blocking water and dust, and meanwhile, the friction force between the shaft 1 and the elastic sealing gasket A132, the elastic sealing lip cover 136 and the elastic sealing sheet B134 is reduced, and finally, and double waterproof, anticorrosion and dustproof effects are achieved.
Example two
As shown in fig. 1 to 7, the water-proof, corrosion-proof and dust-proof magneto-dependent angular displacement sensor comprises a shaft 1, an upper sealing cover 2, a housing 3, a base 4, magnetic steel 5, a lower sealing cover 6, a printed circuit board assembly 7, a lead 8, a bearing A9, a printed board sealing cover 10, a magnetic steel sealing cover 11, a bearing B12, a sealing part 13 and a screw 14.
The upper side of the shell 3 is provided with a sealing cavity, a bearing hole is arranged below the sealing cavity, and a magnetic field area is arranged below the bearing hole; the base 4 in the magnetic field area is arranged in the middle of the shaft 1 and locked by a stop ring, and the shaft 1 and the base 4 are bonded and fixed together through epoxy resin. The magnetic steel 5 is arranged on the base 4, the magnetic steel 5 and the base 4 are bonded together through epoxy resin, the magnetic steel sealing cover 11 is arranged below the base 4, and the magnetic steel sealing cover 11 bonds and seals the base 4 through epoxy resin. The middle part of the lower sealing cover 6 is provided with a printed board groove, the lower part of the printed board groove is provided with a bearing hole, the bearing hole is provided with a bearing A9, the lower sealing cover 6 and the bearing A9 are bonded together through epoxy resin, the printed circuit board assembly 7 is arranged at the printed board groove, the printed circuit board assembly 7 and the lower sealing cover 6 are bonded together through epoxy resin, a lead 8 penetrates out from a wire outlet hole 81 of the lower sealing cover 6, sealing silicone rubber is filled between the wire outlet hole 81 and the lead 8 (as shown in fig. 2), the printed board sealing cover 10 is arranged at the opening of the lower sealing cover 6, and the printed board sealing cover 10 and the lower sealing cover 6 are bonded together and sealed through epoxy resin; the bearing B12 is arranged in a bearing hole of the shell 3, the bearing B12 and the shell 3 are bonded together through epoxy resin, the middle part of the shaft 1 passes through the bearing B12 and is arranged in the bearing B12 hole, the bearing A9 in the lower sealing cover 6 is arranged at the lower end of the shaft 1, meanwhile, the lower sealing cover 6 is tightly combined with the shell 3, and the lower sealing cover 6 and the shell 3 are welded by using laser seal welding;
Fig. 5 is a view showing the outer shapes of the elastic sealing piece B134 and the elastic sealing piece a132, fig. 6 is a view showing the outer shape of the sealing lip pad 133, and fig. 7 is a view showing the outer shape of the elastic sealing lip cover 136.
As shown in fig. 1 and 3, the sealing part 13 is positioned in the sealing cavity, the bottom end of the sealing gasket B135 is a plane, the sealing gasket B135 is installed at the bottommost end of the sealing part, sealing grease is filled and sealed between the sealing gasket B135 and the shaft 1, the upper end of the sealing gasket B135 is a curved surface, an elastic sealing sheet B134 is installed on the curved surface, the elastic sealing sheet B134 is made of an elastic material by injection molding, fig. 4 shows a graph in a free state, the elastic sealing sheet B134 is installed between the shaft 1 and the shell 3 in the sealing part 13 and is tightly attached to the curved surface of the sealing gasket B135, the tip end of the inner ring of the elastic sealing sheet B134 is bent upwards and tightly attached to the shaft 1, a shaping sheet 137 is installed at the upper end of the elastic sealing sheet B134, and sealing grease is filled and sealed between the shaping sheet 137 and the shaft 1; the elastic sealing lip cover 136 is formed by injection molding of an elastic material, the elastic sealing lip cover 136 is arranged in the curved surface direction of the sealing lip pad 133, the tip end of the elastic sealing lip cover 136 is suspended with the sealing lip pad 133, the suspended position is a buffer zone, and the tip end of the elastic sealing lip cover 136 is clung to the shaft 1; the sealing gasket A131 is arranged on the elastic sealing lip cover 136, and sealing grease is filled and sealed between the sealing gasket A131 and the shaft 1; then the elastic sealing piece A132 is arranged on the sealing gasket A131, sealing grease is filled and sealed between the elastic sealing piece A132 and the upper sealing cover 2, the sealing part of the upper sealing cover 2 is fastened and sealed by the screw 14, the water caltrop positions of the upper sealing cover 2 and the shell 3 are provided with sealing grooves, the sealing grooves are provided with elastic silicon rubber, and the shell 3 and the upper sealing cover 2 are sealed by the sealing silicon rubber;
The base 4 and the magnetic steel sealing cover 11 are sealed and fixed through epoxy resin, the printed board sealing cover 10 and the lower sealing cover 6 are sealed and fixed through epoxy resin, so that a sealing environment is formed, meanwhile, the magnetic steel sealing cover 11 and the printed board sealing cover 10 are made of non-magnetic conductive metal materials, the printed circuit board assembly 7 can sense the magnetic field of the magnetic steel 5, and the magnetic field is not shielded and demagnetized.
The working principle of this embodiment is as follows:
When the magnetic field sensor is used, the printed circuit board assembly 7 and the lower sealing cover 6 are fixed relatively, the servo system rotates to drive the shaft 1 to rotate, the shaft 1 rotates to drive the magnetic steel 5 on the base 4 to rotate, the magnetic steel 5 and the printed circuit board assembly 7 generate relative angular displacement movement, and the printed circuit board assembly 7 converts magnetic field signals into hexadecimal angular displacement signals of corresponding communication protocols to be output. Because the elastic sealing piece B134, the elastic sealing lip cover 136 and the elastic sealing piece A132 are made of elastic materials by injection molding, the elastic sealing piece B134, the elastic sealing lip cover 136 and the elastic sealing piece A132 are in close contact with the shaft 1 when rotating and have no gap; the sealing part 13 is internally filled with sealing grease 138, and the sealing grease 138 has the functions of low fluidity, difficult flow, lubrication and dust prevention. When water or dust invades from the gap between the shaft 1 and the upper sealing cover plate 2, the position of the elastic sealing sheet A132 is restrained by the curved surface shape of the sealing sheet A131, meanwhile, the elastic sealing lip cover 136 is tightly attached to the shaft 1 in the 360-degree direction, the elastic sealing gasket B134 is restrained by the curved surface shape of the sealing gasket B135, and the sealing grease fills all gap spaces, and the sealing grease is sealed by the upper sealing cover 2, the elastic sealing gasket A132, the elastic sealing lip cover 136, the elastic sealing sheet B134 and the shell 3, and has poor fluidity but lubrication effect because of the poor fluidity of the sealing grease, so that the sealing grease cannot overflow from the gaps between the upper sealing cover 2 and the shaft 1 and between the shell 3 and the shaft 1, the sealing grease plays a role of blocking water and dust, and meanwhile, the friction force between the shaft 1 and the elastic sealing gasket A132, the elastic sealing lip cover 136 and the elastic sealing sheet B134 is reduced, and finally, and double waterproof, anticorrosion and dustproof effects are achieved.
The waterproof, dustproof and anticorrosion functions between the rotating shaft 1 and the housing 3 of the angular displacement sensor are realized by using the structures of the upper sealing cover 2, the elastic sealing sheet A132, the sealing gasket A131, the sealing lip gasket 133, the elastic sealing lip cover 136, the shaping sheet 137, the elastic sealing gasket B134, the sealing gasket B135, the housing 3 and the sealing grease. The non-contact magnetic induction technology is adopted in the embodiment, and the magnetic steel sealing cover 11 and the printed board sealing cover 10 are adopted to respectively and completely seal the magnetic steel 5 and the printed circuit board assembly 7, so that the waterproof, anti-corrosion and dustproof effects of components and chips in the printed circuit board assembly 7 are realized, and meanwhile, the linear precision, the service life and the sensitivity of the product are not influenced. The magnetic steel sealing cover 11 and the printed board sealing cover 10 of the embodiment are made of non-magnetic conductive metal materials, the printed circuit board assembly 7 can sense the magnetic field of the magnetic steel 5, and the magnetic field is not shielded and demagnetized. In the embodiment, a non-contact magnetic induction technology is adopted, the magnetic steel 5 and the printed circuit board assembly 7 are suspended, and the linear precision, the service life and the sensitivity of the product are not affected after the sealing.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. The utility model provides a magnetism-sensitive angular displacement sensor of waterproof, anticorrosion, dustproof, includes magnet steel (5), printed circuit board subassembly (7), axle (1), upper seal lid (2), shell (3), lower seal lid (6), upper seal lid (2) seal mounting in shell (3) top, lower seal lid (6) seal mounting in shell (3) bottom, axle (1) normal running fit installs in shell (3), upper seal lid (2) are run through on axle (1) top; the method is characterized in that: the upper part of the shell (3) is provided with a sealing cavity matched with the shaft (1), the lower part of the shell (3) is provided with a bearing mounting groove A, a sealing part (13) matched with the shaft (1) is arranged in the sealing cavity of the shell (3), and a bearing B (12) matched with the shaft (1) is arranged in the bearing mounting groove A of the shell (3); the shell (3) is provided with a magnetic field cavity A below the bearing mounting groove A, the lower sealing cover (6) is provided with a magnetic field cavity B matched with the magnetic field cavity A, the magnetic field cavity A and the magnetic field cavity B jointly form a magnetic induction cavity, the lower sealing cover (6) is provided with a bearing mounting groove B in a sunken mode in the middle of the magnetic field cavity B, a bearing A (9) is mounted in the bearing mounting groove B of the lower sealing cover (6), and the bottom end of the shaft (1) is mounted in the bearing A (9) in a rotating fit mode; the bearing is characterized in that a base (4) positioned in a bearing mounting groove A is fixed outside the shaft (1), magnetic steel (5) is arranged at the bottom of the base (4), a printed circuit board assembly (7) positioned in a magnetic field cavity B is fixed on a lower sealing cover (6), and a lead (8) electrically connected with the printed circuit board assembly (7) is arranged on the lower sealing cover (6) in a penetrating manner; sealing portion (13) are including sealed lip pad (133) and elastic seal lip cover (136), elastic seal lip cover (136) are from sealed lip pad (133) inboard to outside suit on sealed lip pad (133), elastic seal lip cover (136) top is equipped with sealing gasket A (131), sealing gasket A (131) top is equipped with elastic seal piece A (132), elastic seal lip cover (136) bottom is equipped with arc shaping piece (137), arc shaping piece (137) bottom is equipped with elastic seal piece B (134), elastic seal piece B (134) bottom is equipped with sealing gasket B (135).
2. A water-resistant, corrosion-resistant, dust-resistant magnetically sensitive angular displacement sensor according to claim 1, wherein: the whole sealing lip pad (133) is in a circular ring shape, and the inner side of the sealing lip pad (133) is provided with a cone part; the elastic sealing lip cover (136) is in an annular shape as a whole, the inner side of the elastic sealing lip cover (136) is provided with a cone tip part, and the cone tip part of the elastic sealing lip cover (136) is tightly attached to the outer side of the shaft (1).
3. A water-resistant, corrosion-resistant, dust-resistant magnetically sensitive angular displacement sensor according to claim 2, wherein: a buffer clearance space is formed between the cone tip part of the elastic seal lip cover (136) and the cone part of the seal lip pad (133).
4. A water-proof, corrosion-proof, dust-proof magnetically sensitive angular displacement sensor according to claim 2 or 3, characterized in that: the bottom surface of the sealing gasket B (135) is a plane matched with the bottom of the sealing cavity of the shell (3), the top surface of the sealing gasket B (135) is an arc curved surface, the bottom surface of the elastic sealing sheet B (134) is an arc curved surface matched with the top surface of the sealing gasket B (135), the top surface of the elastic sealing sheet B (134) is an arc curved surface, the bottom surface of the arc shaping sheet (137) is an arc curved surface matched with the top surface of the elastic sealing sheet B (134), and the top surface of the arc shaping sheet (137) is an arc curved surface matched with the lower contour surface of the elastic sealing lip cover (136).
5. A water, corrosion and dust resistant magnetically sensitive angular displacement sensor according to claim 4, wherein: the bottom surface of the sealing gasket A (131) is an arc curved surface matched with the upper contour surface of the elastic sealing lip cover (136), the top surface of the sealing gasket A (131) is an arc curved surface, the bottom surface of the elastic sealing sheet A (132) is an arc curved surface matched with the top surface of the sealing gasket A (131), and the top surface of the elastic sealing sheet A (132) is an arc curved surface.
6. A water, corrosion and dust resistant magnetically sensitive angular displacement sensor according to claim 5, wherein: the gap space between the top surface of the elastic sealing piece A (132) and the upper sealing cover (2) is a sealing grease cavity A, the gap space between the bottom surface of the elastic sealing piece A (132), the side surface of the sealing gasket A (131) and the upper contour surface of the elastic sealing lip cover (136) is a sealing grease cavity B, the gap space between the side surface of the arc-shaped shaping piece (137), the lower contour surface of the elastic sealing lip cover (136) and the top surface of the elastic sealing piece B (134) is a sealing grease cavity C, the gap space between the side surface of the sealing gasket B (135) and the bottom surface of the elastic sealing piece B (134) is a sealing grease cavity D, and sealing grease (138) is respectively filled in the sealing grease cavity A, the sealing grease cavity B, the sealing grease cavity C and the sealing grease cavity D.
7. A water-resistant, corrosion-resistant, dust-resistant magnetically sensitive angular displacement sensor according to claim 1, wherein: the base (4) is fixedly arranged outside the shaft (1) through a stop ring, the base (4) and the shaft (1) are also fixed through epoxy resin adhesion, the magnetic steel (5) and the base (4) are fixed through epoxy resin adhesion, and a magnetic steel sealing cover (11) matched with the magnetic steel (5) is arranged below the base (4); the lower sealing cover (6) is provided with a printed board groove, the printed circuit board assembly (7) is fixed in the printed board groove through epoxy bonding, the lower sealing cover (6) is provided with a printed board sealing cover (10) matched with the printed circuit board assembly (7), the lower sealing cover (6) is fixed with the bottom of the shell (3) through laser sealing welding, the top of the shell (3) is fixed with the upper sealing cover (2) through a screw (14), the upper sealing cover (2) is provided with a sealing groove with the water caltrop of the shell (3), and elastic silicon rubber is arranged in the sealing groove.
8. A water-resistant, corrosion-resistant, dust-resistant magnetically sensitive angular displacement sensor according to claim 2, wherein: the elastic sealing piece B (134), the elastic sealing lip cover (136) and the elastic sealing piece A (132) are all formed by injection molding of elastic materials, and the surfaces of the elastic sealing pieces A (132) are smooth.
9. A water-resistant, corrosion-resistant, dust-resistant magnetically sensitive angular displacement sensor according to claim 1, wherein: the lower sealing cover (6) is provided with a wire outlet hole (81) in a penetrating mode, the lead (8) penetrates through the wire outlet hole of the lower sealing cover (6), and silicon rubber is filled between the lead (8) and the wire outlet hole (81) of the lower sealing cover (6).
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