CN110849400A - Instability detection sensor and packaging method - Google Patents
Instability detection sensor and packaging method Download PDFInfo
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- CN110849400A CN110849400A CN201911226316.1A CN201911226316A CN110849400A CN 110849400 A CN110849400 A CN 110849400A CN 201911226316 A CN201911226316 A CN 201911226316A CN 110849400 A CN110849400 A CN 110849400A
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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
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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
- G01D11/245—Housings for sensors
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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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Abstract
The invention provides a destabilization detection sensor and a packaging method, belonging to the technical field of sensors, the destabilization detection sensor comprises a metal outer shell, a metal inner shell and a circuit unit, wherein one side surface of the metal outer shell is provided with a first opening and is connected with a first sealing cover for packaging the first opening; the metal inner shell is arranged in the metal outer shell, and a preset gap is formed between the metal inner shell and the metal outer shell; a second opening is formed in the side face, facing the first sealing cover, of the metal inner shell, and the side face is connected with a second sealing cover used for packaging the second opening; the circuit unit is fixedly connected to the inner wall of the metal inner shell and is provided with a signal cable which sequentially penetrates through the side wall of the metal inner shell and the side wall of the metal outer shell outwards, and the signal cable is used for being electrically connected with the signal processor; when the second sealing cover encapsulates the second opening and the first opening faces upwards, the liquid first silicon rubber is filled in the preset gap, and the first silicon rubber is used for completely wrapping and insulating and supporting the metal inner shell in the metal outer shell after being cured.
Description
Technical Field
The invention belongs to the technical field of sensors, and particularly relates to a destabilization detection sensor and a packaging method.
Background
With the rapid development of high-speed railway transportation and the continuous improvement of the speed thereof, the real-time monitoring of the operation safety and the comfort becomes the primary work. Because the rail locomotive has a complex structure, a severe working environment and a complex electromagnetic environment, a system which can reliably work in the complex environment must be designed to safely monitor the running state of the vehicle; due to the particularity of the rail vehicle structure, the monitoring of the rail vehicle is most important to monitor the state of the bogie in real time.
The detection quality of the bogie instability detection device and the reliability of the instability detection sensor are depended on. Due to the problems of poor electromagnetic compatibility, low voltage resistance and low protection level of the existing sensor, a detection signal of the existing sensor is easily subjected to electromagnetic interference, so that the condition that a bogie instability detection device is misjudged and misjudged is caused, and a rail locomotive derailment accident is caused under the serious condition, so that great loss is caused.
Disclosure of Invention
The invention aims to provide a destabilization detection sensor and a packaging method, and aims to solve the problems of poor anti-interference performance and low pressure resistance of the existing destabilization detection sensor.
In order to achieve the purpose, the invention adopts the technical scheme that: provided is a buckling detection sensor including:
the metal shell is provided with a first opening on one side surface, and the side surface is connected with a first sealing cover used for packaging the first opening;
the metal inner shell is arranged inside the metal outer shell, and a preset gap is formed between the metal inner shell and the metal outer shell; a second opening is formed in the side face, facing the first sealing cover, of the metal inner shell, and the side face is connected with a second sealing cover used for packaging the second opening;
the circuit unit is fixedly connected to the inner wall of the metal inner shell and is provided with a signal cable which sequentially penetrates through the side wall of the metal inner shell and the side wall of the metal outer shell outwards, and the signal cable is used for being electrically connected with the signal processor;
when the second sealing cover encapsulates the second opening and the first opening faces upwards, the liquid first silicon rubber is filled in the preset gap, and the first silicon rubber is used for completely coating and insulating and supporting the metal inner shell and the second sealing cover in the metal outer shell after being solidified.
As another embodiment of the application, an adjusting piece is arranged between the metal outer shell and the metal inner shell, and the adjusting piece is used for connecting the metal inner shell and the metal outer shell and adjusting the preset gap.
As another embodiment of this application, be equipped with the shaft hole on the lateral wall of metal inner shell dorsad first closing cap, be equipped with the screw thread blind hole that corresponds with the shaft hole on the inner wall of metal outer shell, the one end and the shaft hole of regulating part are rotated and are connected, other end and screw thread blind hole threaded connection.
As another embodiment of this application, the regulating part interval is equipped with a plurality ofly, and each regulating part includes:
the rotating shaft is rotatably connected with the shaft hole;
and the threaded part, one end of which is in threaded connection with the blind hole, the other end of which is in butt joint with the rotating shaft, and the butt joint end of the threaded part and the rotating shaft is in butt joint with the outer wall of the metal inner shell.
As another embodiment of the present application, a side surface of the metal shell opposite to the first opening is provided with a connection hole, and the connection hole is used for passing through a cable of the sensor; the side surface of the metal inner shell facing the connecting hole is provided with a through hole, and the through hole is aligned with the connecting hole and used for passing through a cable; the connecting hole is connected with a fixed joint used for fastening a cable, and the fixed joint is in threaded connection with a locking nut.
As another embodiment of the present application, a plurality of plugging holes are formed in a wall of the metal inner casing, and a plurality of plugging bodies are formed in the circuit unit, and are plugged into the plugging holes in a one-to-one correspondence manner.
As another embodiment of the present application, after the circuit unit and the signal cable are fixedly connected, and the second opening is upward, the metal inner shell is filled with a liquid second silicone rubber, and the second silicone rubber is used for completely covering the peripheries of the circuit unit and the signal cable after being cured.
As another embodiment of the present application, the circuit unit includes a circuit board and a sensing element electrically connected to the circuit board; wherein, the sensitive element is adhered to the inner wall of the metal inner shell; the circuit board is provided with a plurality of glue permeating holes.
As another embodiment of the present application, a first gap is formed between the cured first silicone rubber and the first cover; a second gap is formed between the cured second silicon rubber and the second sealing cover.
The instability detection sensor provided by the invention has the beneficial effects that: compared with the prior art, the instability detection sensor has the advantages that the circuit unit is fixed on the inner wall of the metal inner shell, the metal inner shell which is packaged with the second sealing cover is connected to the inside of the metal outer shell which is packaged with the first sealing cover, a double-layer metal shielding structure for the circuit unit is formed, electromagnetic compatibility can be improved, anti-interference performance is improved, and detection signals are transmitted to the signal processor accurately and reliably;
first silicon rubber is liquid and fills to the clearance of predetermineeing between metal casing and the metal inner shell in, utilizes the mobility of liquid, makes first silicon rubber can be with the complete cladding of metal inner shell, can keep apart metal inner shell and metal casing completely after the solidification, can play sealed effect on the one hand, and is good and waterproof dustproof performance to the protectiveness of circuit unit, ensures to work in the harsh environmental stability, and on the other hand can make metal inner shell and metal casing highly insulating, improves alternating current withstand voltage performance.
The invention also provides a packaging method of the instability detection sensor, which comprises the following steps:
connecting the metal inner shell to the inside of the metal outer shell, and adjusting the adjusting piece to enable a preset gap to be kept between the metal inner shell and the metal outer shell;
the signal cable sequentially penetrates out of the metal inner shell and the metal outer shell, and the circuit unit is fixedly connected to the inner wall of the metal inner shell;
filling liquid silicon rubber into the metal inner shell with the upward opening for multiple times, exhausting air, and filling the liquid silicon rubber to a position 1-2 mm away from the opening of the metal inner shell;
after the liquid silicone rubber is solidified, a second sealing cover is packaged in the opening of the metal inner shell;
filling silicon rubber between the metal outer shell with the upward opening and the metal inner shell for multiple times and exhausting, wherein the filling amount of the liquid silicon rubber can completely coat the metal inner shell and the second sealing cover and is 1-2 mm away from the opening of the metal outer shell;
and after the liquid silicone rubber is solidified, packaging a first sealing cover in the opening of the metal shell to obtain the packaged instability detection sensor.
The packaging method of the instability detection sensor provided by the invention has the beneficial effects that: according to the instability detection sensor obtained by the encapsulation method of the instability detection sensor, the circuit unit is fixed on the inner wall of the metal inner shell, and the metal inner shell which encapsulates the second sealing cover is connected to the inside of the metal outer shell which encapsulates the first sealing cover, so that a double-layer metal shielding structure for the circuit unit is formed, the electromagnetic compatibility can be improved, the anti-interference performance is improved, and the detection signal is ensured to be accurately and reliably transmitted to the signal processor;
the silicon rubber is filled into a preset gap between the metal outer shell and the metal inner shell in a liquid state, the metal inner shell can be completely coated by the silicon rubber by utilizing the liquidity of the liquid, and the metal inner shell and the metal outer shell can be completely isolated after solidification, so that the silicon rubber can play a role in sealing, has good protection performance and waterproof and dustproof performance on a circuit unit, ensures stable work in a severe environment, and can highly insulate the metal inner shell and the metal outer shell to improve the alternating current voltage resistance;
the metal inner shell is internally encapsulated with silicon rubber to comprehensively coat the circuit unit, so that on one hand, the circuit unit and the metal inner shell can be stably and reliably fixed, the vibration frequency of a sensitive element on the circuit unit is ensured to be consistent with the vibration frequency transmitted to the metal inner shell, and the induction precision is improved; on the other hand, the circuit unit is highly insulated, and good protection is provided for the circuit unit;
the preset gap between the metal inner shell and the metal outer shell can be adjusted, so that the thickness of the liquid silicon rubber which is encapsulated between the metal inner shell and the metal outer shell after solidification can be controlled, solidified silicon rubber with different elastic moduli is obtained, the elastic vibration transfer frequency of the obtained silicon rubber is highly matched with the response frequency of the instability detection sensor, and the induction precision of the instability detection sensor is improved;
the silicon rubber is encapsulated in the metal inner shell and between the metal inner shell and the metal outer shell for multiple times, and exhaust is performed after encapsulation is finished each time, so that the final curing form of the silicon rubber can be accurately controlled, and the high vacuum degree in the cured silicon rubber is ensured, so that the high elastic transmission precision and the strong alternating current pressure resistance of the silicon rubber are ensured;
leave the space between the silicon rubber solidification back and the second closing cap in the metal inner shell, leave the space between the silicon rubber solidification back between metal inner shell and the metal casing and the first closing cap, guarantee that work process circuit unit generates heat and lead to silicon rubber thermal expansion's inflation volume to have accommodation space, avoid silicon rubber to extrude second closing cap, first closing cap, cause double-deck metal shielding structure's damage, lead to the encapsulation inefficacy.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of an explosive structure of a instability detection sensor according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an internal structure of a destabilization detection sensor according to an embodiment of the present invention;
fig. 3 is a schematic sectional view taken along line a-a of fig. 2.
In the figure: 1. a metal housing; 10. connecting holes; 11. a first cover; 12. a threaded blind hole; 13. a first opening; 2. a metal inner shell; 20. threading holes; 21. a second cover; 22. a shaft hole; 23. inserting holes; 24. a second opening; 3. an adjustment member; 31. a threaded portion; 32. a rotating shaft; 4. a first silicone rubber; 40. a first void; 5. a circuit unit; 51. a circuit board; 510. a glue permeating hole; 511. an insertion body; 52. a sensing element; 6. fixing the joint; 7. a signal cable; 8. a second silicone rubber; 80. a second void.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to fig. 3, a destabilization detecting sensor according to the present invention will be described. The instability detection sensor comprises a metal outer shell 1, a metal inner shell 2 and a circuit unit 5, wherein a first opening 13 is formed in one side face of the metal outer shell 1, and the side face is connected with a circuit board used for packaging the first opening 13
A first cover 11; the metal inner shell 2 is arranged inside the metal outer shell 1, and a preset gap is formed between the metal inner shell 2 and the metal outer shell 1; the side of the metal inner shell 2 facing the first cover 11 is provided with a second opening 24, and the side is connected with a second cover 21 for sealing the second opening 24; the circuit unit 5 is fixedly connected to the inner wall of the metal inner shell 2, and is provided with a signal cable 7 which sequentially penetrates through the side wall of the metal inner shell 2 and the side wall of the metal outer shell 1 outwards, and the signal cable 7 is used for being electrically connected with the signal processor; when the second cover 21 encapsulates the second opening 24 and the first opening 13 faces upward, the predetermined gap is filled with the liquid first silicone rubber 4, and after the first silicone rubber 4 is cured, the metal inner shell 2 and the second cover 21 are completely wrapped and supported in the metal outer shell 1 in an insulating manner.
The invention provides a working principle of a instability detection sensor, which comprises the following steps: instability detection sensor fixed mounting usually is on the bogie of high-speed locomotive, whether steady real-time detection carries out to the running state of bogie, metal casing 1 and bogie fixed connection, consequently unanimous with the vibration frequency of bogie, and can transmit to metal inner shell 2 through first silicon rubber 4, and then make fixed mounting sense corresponding vibration frequency in the inside circuit unit 5 of metal inner shell 2, then pass through signal cable 7 with the frequency signal and transmit to signal processor and carry out the analysis, thereby judge whether stable the running state of bogie.
The first silicon rubber 4 transmits vibration by using elasticity thereof, the transmission rate of the vibration frequency is related to the elastic modulus of the first silicon rubber, and the elastic modulus is related to the thickness of the first silicon rubber, so that when the metal inner shell 2 is installed, a preset gap between the metal inner shell 2 and the metal outer shell 1 meets a preset value, then the liquid first silicon rubber 4 is encapsulated, the elastic modulus of the cured first silicon rubber 4 is in a preset range, and the vibration transmission rate is ensured to meet the response frequency requirement of the sensor.
The invention provides a connection mode of a destabilization detection sensor, which comprises the following steps: the circuit unit 5 is fixedly connected with the inner wall of the metal inner shell 2, liquid first silicon rubber 4 is filled between the metal inner shell 2 and the metal outer shell 1, a preset gap is kept between the metal inner shell 2 and the metal outer shell 1, and the metal inner shell 2 is stably supported inside the metal outer shell 1 after the first silicon rubber 4 is solidified;
the second cover 21 and the second opening 24 of the metal inner shell 2, and the first cover 11 and the first opening 13 of the metal outer shell 1 are hermetically connected by laser welding, it should be noted that the second cover 21 and the first cover 11 are both made of metal and are made of the same material as the metal inner shell 2 and the metal outer shell 1, respectively, so as to ensure the integrity of the double-layer metal shielding layer formed by the metal inner shell 2 and the metal outer shell 1.
Compared with the prior art, the instability detection sensor provided by the invention has the advantages that the circuit unit 5 is fixed on the inner wall of the metal inner shell 2, the metal inner shell 2 encapsulating the second sealing cover 21 is connected to the inside of the metal outer shell 1 encapsulating the first sealing cover 11, a double-layer metal shielding structure for the circuit unit 5 is formed, the electromagnetic compatibility can be improved, the anti-interference performance is improved, and the detection signals are accurately and reliably transmitted to the signal processor;
Referring to fig. 2, an adjusting element 3 is disposed between the metal outer shell 1 and the metal inner shell 2, and the adjusting element 3 is used for connecting the metal inner shell 2 and the metal outer shell 1 and for adjusting a predetermined gap. The metal inner shell 2 is connected with the metal outer shell 1 through the adjusting piece 3, the adjusting piece 3 is adjusted to enable a preset gap between the metal inner shell 2 and the metal outer shell 1 to be matched with the thickness value according to the thickness value of the first silicon rubber 4 required by design, so that the preset gap between the metal inner shell 2 and the metal outer shell 1 is kept stable and unchanged in the process of filling and sealing the liquid first silicon rubber 4, the finally obtained solidified first silicon rubber 4 is ensured to be consistent with the design value, and the sensing precision of the instability detection sensor is ensured.
It should be understood that, according to the actually required response frequency requirement of the instability detection sensor, the adjusting member 3 is adjusted to obtain different thicknesses of the first silicone rubber 4 to match the response frequency, of course, the first silicone rubber 4 can be replaced by other insulating materials, the required potting thickness is calculated according to the modulus of elasticity coefficient of the replacing materials, and the preset gap is adjusted to the matching value through the adjusting member 3. Therefore, the adjusting piece 3 is arranged to enable the preset gap between the metal inner shell 2 and the metal outer shell 1 to be adjustable, so that the sensor can be suitable for occasions with different response frequency requirements, and other insulating materials can be adopted to replace the first silicon rubber 4, so that the packaging material of the instability detection sensor has more choices.
In this embodiment, please refer to fig. 1 to 2 together as a specific implementation manner, a shaft hole 22 is disposed on a side wall of the inner metal shell 2 facing away from the first sealing cover 11, a blind threaded hole 12 corresponding to the shaft hole 22 is disposed on an inner wall of the outer metal shell 1, one end of the adjusting element 3 is rotatably connected to the shaft hole 22, and the other end is threadedly connected to the blind threaded hole 12.
When adjusting the interval between metal inner shell 2 and the metal casing 1, rotate regulating part 3, utilize the threaded connection structure of regulating part 3 and screw thread blind hole 12, the lateral wall of regulating part 3 screw in metal casing 1 is dark, and then the interval between metal inner shell 2 and the metal casing 1 is little, otherwise then the interval between the two is big, simple structure, and the interval adjustment is convenient accurate.
In the present embodiment, as a specific implementation manner, please refer to fig. 2, the adjusting part 3 includes a rotating shaft 32 and a threaded portion 31; wherein, the rotating shaft 32 is rotatably connected with the shaft hole 22; one end of the threaded portion 31 is in threaded connection with the blind hole, the other end is abutted with the rotating shaft 32, and the abutting end of the threaded portion 31 and the rotating shaft 32 is abutted with the outer wall of the metal inner shell 2.
Rotate through a plurality of regulating parts 3 and shaft hole 22 and be connected, realize multiple spot connection and regulation between messenger's inner metal shell 2 and the metal casing 1, when guaranteeing that inner metal shell 2 and metal casing 1 are connected stably, can guarantee that the interval between each position of the outer wall of inner metal shell 2 and the inner wall of metal casing 1 keeps unanimous, guarantees that the vibration frequency transmission of first silicon rubber 4 is accurate, improves the response precision of sensor.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 and fig. 2, a side surface of the metal shell 1 opposite to the first opening 13 is provided with a connection hole 10, and the connection hole 10 is used for passing through a cable of the sensor; the side surface of the metal inner shell 2 facing the connecting hole 10 is provided with a through hole, and the through hole is aligned with the connecting hole 10 and used for passing through a cable; the connecting hole 10 is connected with a fixed joint 6 for fastening a cable, and the fixed joint 6 is in threaded connection with a locking nut.
After the signal cable 7 sequentially passes through the threading hole 20 and the connecting hole 10 outwards, the fixing joint 6 is installed on the connecting hole 10 (is sleeved on the signal cable 7 in advance), the signal cable 7 is fixedly connected with the metal shell 1 through the fixing joint 6, the free sliding of the signal cable 7 is avoided, on one hand, the fixing reliability of the sensor cable is ensured, and the connection stability of the sensor cable and the circuit unit 5 is prevented from being influenced by the pulling of the signal cable 7; on the other hand can carry out effectual shutoff to connecting hole 10, avoids having the gap and leading to the phenomenon that dust or water smoke etc. dip into metal inner shell 2 between connecting hole 10 and the signal cable 7 to play waterproof dustproof effect, ensure that the sensor can stable work under various harsh environment.
After the fixed joint 6 is fixedly connected with the connecting hole 10, the locking nut is rotated, so that the end face of the locking nut is abutted against the side wall of the metal shell 1, the fixed joint 6 is locked, the fixed joint 6 is prevented from falling off due to vibration in the long-time running process of the locomotive, and the stable work of the sensor is ensured.
Referring to fig. 1, a plurality of plugging holes 23 are formed in a wall of the metal inner casing 2, and a plurality of plugging bodies 511 are formed in the circuit unit 5 and are plugged into the plugging holes 23 in a one-to-one correspondence manner.
The circuit unit 5 is connected with the metal inner shell 2 in an inserting manner, the installation is convenient, and if necessary, the splicing holes 23 and/or the splicing bodies 511 are/is coated with adhesive, so that the rigid connection between the circuit unit 5 and the metal inner shell 2 is realized, the connection between the circuit unit 5 and the inner shell is ensured to be stable and reliable, meanwhile, the sensitive element 52 on the circuit unit 5 can accurately sense the vibration acceleration transmitted to the metal inner shell 2 from the outside, and the sensing precision of the sensor is ensured to be high.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 2 and fig. 3, after the circuit unit 5 and the signal cable 7 are fixedly connected and the second opening 24 is upward, the metal inner shell 2 is filled with the liquid second silicone rubber 8, and the second silicone rubber 8 is used to completely cover the outer peripheries of the circuit unit 5 and the signal cable 7 after being cured. The second silicon rubber 8 can fully coat the circuit unit 5, so that on one hand, the circuit unit 5 and the metal inner shell 2 can be stably and reliably fixed, the vibration frequency of the sensitive element 52 on the circuit unit 5 is ensured to be consistent with the vibration frequency transmitted to the metal inner shell 2, and the induction precision is improved; on the other hand, the circuit unit 5 is highly insulated, so that the circuit unit 5 is well protected, a waterproof and dustproof effect is achieved, and the sensor is ensured to be suitable for severe environments.
In this embodiment, as an embodiment, referring to fig. 1 and fig. 3, the circuit unit 5 includes a circuit board 51 and a sensing element 52 electrically connected to the circuit board 51; wherein, the sensitive element 52 is adhered with the inner wall of the metal inner shell 2; the circuit board 51 is provided with a plurality of glue holes 510.
When the liquid second silicone rubber 8 is filled, the liquid second silicone rubber 8 can be filled in each of the rubber through holes 510 by utilizing the fluidity thereof, and the circuit board 51 can be completely coated after the second silicone rubber 8 is cured, so that the insulating support and vibration filtering effects on the circuit board 51 are achieved, the connection stability of the circuit board 51 is prevented from being influenced by external vibration, and the service life of the circuit board 51 is ensured;
the sensing element 52 is bonded with the inner wall of the metal inner shell 2, so that the vibration transmitted to the metal inner shell 2 from the outside can be completely transmitted to the sensing element 52, and the sensing precision is improved.
In this embodiment, as a specific implementation manner, please refer to fig. 2 and fig. 3, a first gap 40 is formed between the cured first silicon rubber 4 and the first sealing cover 11; after being cured, the second silicone rubber 8 has a second gap 80 with the second cover 21.
Sensor internal circuit unit 5 work generates heat, make first silicon rubber 4 thermal expansion, thereby produce the squeezing action to metal casing 1 and metal inner shell 2, set up the thermal expansion volume that first space 40 is used for holding first silicon rubber 4, thereby avoid first silicon rubber 4 to outer box of metal and metal inner shell 2, especially extrude the impaired condition of being connected that leads to first closing cap 11 and metal casing 1 to encapsulating first closing cap 11 on metal casing 1, ensure the stability of the double-deck metal shielding layer structure of metal inner shell 2 and the common formation of metal casing 1, guarantee the job stabilization reliable of sensor.
Also, the second gap can accommodate the volume of the second silicon rubber 8 expanded by heat, and avoid over-pressing the circuit unit 5 to cause damage to the circuit unit 5.
The present invention also provides a method for packaging a buckling detection sensor, referring to fig. 1 to 3, including the following steps:
connecting the metal inner shell 2 to the inside of the metal outer shell 1, and adjusting the adjusting piece 3 to enable a preset gap to be kept between the metal inner shell 2 and the metal outer shell 1;
the signal cable 7 sequentially penetrates out of the metal inner shell 2 and the metal outer shell 1, and the circuit unit 5 is fixedly connected to the inner wall of the metal inner shell 2;
filling liquid silicon rubber into the metal inner shell 2 with the upward opening for multiple times, exhausting air, and filling the liquid silicon rubber to a position 1-2 mm away from the opening of the metal inner shell 2;
after the liquid silicone rubber is solidified, a second sealing cover 21 is packaged at the opening of the metal inner shell 2;
filling silicon rubber between the metal outer shell 1 with the upward opening and the metal inner shell 2 for multiple times and exhausting, wherein the filling amount of the liquid silicon rubber can completely cover the metal inner shell 2 and the second sealing cover 21 and is 1-2 mm away from the opening of the metal outer shell 1;
and after the liquid silicone rubber is solidified, packaging a first sealing cover 11 in the opening of the metal shell 1 to obtain the packaged instability detection sensor.
Compared with the prior art, the method for packaging the instability detection sensor provided by the invention has the advantages that the circuit unit 5 is fixed on the inner wall of the metal inner shell 2, the metal inner shell 2 is connected into the metal outer shell 1 to form a double-layer metal shielding structure for the circuit unit 5, the electromagnetic compatibility can be improved, the anti-interference performance is improved, and the detection signal is accurately and reliably transmitted to the signal processor;
the silicon rubber is filled into a preset gap between the metal outer shell 1 and the metal inner shell 2 in a liquid state, the metal inner shell 2 can be completely coated by the silicon rubber through the liquidity of the liquid, and the metal inner shell 2 and the metal outer shell 1 can be completely isolated after solidification, so that on one hand, the silicon rubber can play a role in sealing, the protection performance and the waterproof and dustproof performance of the circuit unit 5 are improved, the stable work of the sensor in a severe environment is ensured, on the other hand, the metal inner shell 2 and the metal outer shell 1 can be highly insulated, and the alternating-current voltage resistance of the sensor is improved;
the silicon rubber is filled and sealed in the metal inner shell 2 to completely coat the circuit unit 5, so that on one hand, the circuit unit 5 and the metal inner shell 2 can be stably and reliably fixed, the vibration frequency of the sensitive element 52 on the circuit unit 5 is ensured to be consistent with the vibration frequency transmitted to the metal inner shell 2, and the induction precision is improved; on the other hand, the circuit unit 5 is highly insulated, and good protection is provided for the circuit unit 5;
the preset gap between the metal inner shell 2 and the metal outer shell 1 can be adjusted, so that the thickness of the solidified liquid silicon rubber encapsulated between the metal inner shell 2 and the metal outer shell 1 can be controlled, the elastic vibration transmission frequency of the silicon rubber is highly matched with the response frequency of the instability detection sensor, and the induction precision of the instability detection sensor is improved;
the silicon rubber is encapsulated in the metal inner shell 2 and between the metal inner shell 2 and the metal outer shell 1 for multiple times, and exhaust is performed after encapsulation is finished each time, so that the final curing form of the silicon rubber can be accurately controlled, and the high vacuum degree in the cured silicon rubber is ensured, thereby ensuring high elastic transmission precision of the silicon rubber and strong alternating current pressure resistance;
leave the space between the silicon rubber solidification back and the second closing cap 21 in the metal inner shell 2, leave the space between the silicon rubber solidification back between metal inner shell 2 and the metal outer shell 1 and the first closing cap 11, guarantee that work process circuit unit 5 generates heat and lead to the inflation volume of silicon rubber thermal expansion to have accommodation space, avoid silicon rubber to second closing cap 21, first closing cap 11 extrudes, cause double-deck metal shielding structure's damage and lead to the condition of encapsulation inefficacy, ensure that the job stabilization of unstability detection sensor is reliable.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A buckling detection sensor, characterized by comprising:
the metal shell is provided with a first opening on one side surface, and the side surface is connected with a first sealing cover used for packaging the first opening;
the metal inner shell is arranged inside the metal outer shell, and a preset gap is formed between the metal inner shell and the metal outer shell; a second opening is formed in the side face, facing the first sealing cover, of the metal inner shell, and the side face is connected with a second sealing cover used for packaging the second opening;
the circuit unit is fixedly connected to the inner wall of the metal inner shell and is provided with a signal cable which sequentially penetrates through the side wall of the metal inner shell and the side wall of the metal outer shell outwards, and the signal cable is used for being electrically connected with the signal processor;
when the second sealing cover encapsulates the second opening and the first opening faces upwards, the preset gap is filled with liquid first silicon rubber, and the first silicon rubber is used for completely coating and insulating and supporting the metal inner shell and the second sealing cover in the metal outer shell after being cured.
2. A buckling detection sensor as defined in claim 1, wherein: the metal shell with be equipped with the regulating part between the metal inner shell, the regulating part is used for connecting the metal inner shell metal shell and be used for adjusting preset clearance.
3. A buckling detection sensor as defined in claim 2, wherein: the metal inner shell is equipped with the shaft hole dorsad on the lateral wall of first closing cap, be equipped with on the inner wall of metal outer shell with the screw thread blind hole that the shaft hole corresponds, the one end of regulating part with the shaft hole rotates to be connected, the other end with screw thread blind hole threaded connection.
4. A buckling detection sensor as defined in claim 3, wherein said regulating member is provided in plural at intervals, each of said regulating members comprising:
the rotating shaft is rotatably connected with the shaft hole;
and the threaded part has one end in threaded connection with the blind hole and the other end in butt joint with the rotating shaft, and the butt joint end of the threaded part is abutted against the outer wall of the metal inner shell.
5. A buckling detection sensor as defined in claim 1, wherein: a connecting hole is formed in the side face, opposite to the first opening, of the metal shell, and the connecting hole is used for allowing a cable of the sensor to pass through; the side surface of the metal inner shell facing the connecting hole is provided with a through hole, and the through hole is aligned with the connecting hole and used for passing through the cable;
the connecting hole is connected with a fixed joint used for fastening the cable, and the fixed joint is in threaded connection with a locking nut.
6. A buckling detection sensor as defined in claim 1, wherein: the shell wall of the metal inner shell is provided with a plurality of plug holes, and the circuit unit is provided with a plurality of plug bodies which are correspondingly plugged with the plug holes one by one.
7. A destabilizing detecting sensor according to any of claims 1-6, wherein: after the circuit unit and the signal cable are fixedly connected and the second opening faces upwards, liquid second silicon rubber is filled in the metal inner shell, and the second silicon rubber is used for completely coating the peripheries of the circuit unit and the signal cable after being cured.
8. A buckling detection sensor as defined in claim 7, wherein: the circuit unit comprises a circuit board and a sensitive element electrically connected with the circuit board; the sensing element is bonded with the inner wall of the metal inner shell; the circuit board is provided with a plurality of glue permeating holes.
9. A buckling detection sensor as defined in claim 7, wherein: a first gap is formed between the solidified first silicon rubber and the first sealing cover; and a second gap is formed between the cured second silicon rubber and the second sealing cover.
10. A packaging method of a instability detection sensor is characterized by comprising the following steps:
connecting the metal inner shell to the inside of the metal outer shell, and adjusting an adjusting piece to enable a preset gap to be kept between the metal inner shell and the metal outer shell;
sequentially penetrating a signal cable outwards through the metal inner shell and the metal outer shell, and fixedly connecting a circuit unit on the inner wall of the metal inner shell;
filling liquid silicon rubber into the metal inner shell with the upward opening for multiple times, exhausting air, and filling the silicon rubber to a position 1-2 mm away from the opening of the metal inner shell;
after the silicon rubber is solidified, a second sealing cover is packaged at the opening of the metal inner shell;
filling liquid silicon rubber between the metal outer shell with the upward opening and the metal inner shell for multiple times, and exhausting air, wherein the filling amount of the silicon rubber can completely cover the metal inner shell and the second sealing cover and is 1-2 mm away from the opening of the metal outer shell;
and after the silicon rubber is cured, a first sealing cover is packaged at the opening of the metal shell to obtain the packaged instability detection sensor.
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