CN107894513B - Hall speed sensor for rail transit and manufacturing method thereof - Google Patents
Hall speed sensor for rail transit and manufacturing method thereof Download PDFInfo
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- CN107894513B CN107894513B CN201710977863.8A CN201710977863A CN107894513B CN 107894513 B CN107894513 B CN 107894513B CN 201710977863 A CN201710977863 A CN 201710977863A CN 107894513 B CN107894513 B CN 107894513B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
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Abstract
The Hall speed sensor for rail transit comprises an integrated base, a low-pressure injection molding module, a tail pipe, an anti-rotation ring and a compression cap; a limiting mechanism is arranged between the inner cavity of the integrated base and the anti-rotation ring, and a phase positioning mechanism is arranged between the limiting mechanism and the low-pressure injection module; the inner cavity surface of the tail pipe is provided with a printed board mounting groove; the anti-rotation ring is sleeved on the tail pipe and is arranged in the inner cavity of the integrated base and limited by the limiting mechanism; the outer circular surface of the pressing cap is in threaded connection with the tail of the integrated shell, the front end of the pressing cap is provided with an anti-rotation ring extrusion surface, and when the pressing cap rotates, the anti-rotation ring is pressed by the extrusion anti-rotation ring extrusion surface, so that the low-pressure injection molding module is in close contact with and fixed on the integrated base; the low-pressure injection molding module comprises an internal core piece and a support piece, wherein the support piece is formed outside the internal core piece through plastic low-pressure injection molding, two parallel waist-shaped plane notches are formed in the outer cylindrical surface of the low-pressure injection molding module, and the surfaces of the waist-shaped plane notches are parallel to the plane of a printed board of the internal chip. A manufacturing method is also correspondingly provided.
Description
Technical Field
The invention relates to a Hall rotating speed sensor for rail transit.
Background
A2-channel Hall principle speed sensor is composed of permanent magnetic steel, Hall element, amplifying and shaping circuit, casing, cable and connector. The magnetic steel, the Hall element and the amplifying and shaping circuit are packaged in the shell, and the shell is provided with a mounting and positioning structure; the speed sensor is electrically connected with a system through a cable and a connector, a speed measuring fluted disc is arranged on a rotating shaft for supplying power to the sensor and outputting a speed signal at a measured rotating speed, and a sensing surface of the speed sensor is close to the fluted disc. The rotation of the fluted disc enables the magnetic resistance of the magnetic circuit to periodically change along with the change of the air gap, when the tooth top is aligned with the Hall element, the magnetic force line passes through the Hall element in a concentrated manner, larger Hall electromotive force can be generated, and high level is output after amplification and shaping; conversely, when the tooth bottom is aligned with the hall element, the output is low. The change frequency of the output level can change along with the rotation speed of the tachometer gear, and the rotation speed of the measured object can be determined.
The conventional Hall speedtransmitter casing that the track traffic trade used now adopts split type metal casing subassembly more, and it is fixed through the mode that the colloid embedment was filled between inner core subassembly and the casing subassembly, and product manufacturability is poor, and production cycle is long, and is with high costs, and because of inside no gluey stress release structure, the inefficacy condition such as solder joint fracture easily appears when using under the environment is become to long-term big temperature, and product reliability is poor. Due to the non-modular design, the production period cannot be shortened by preparing materials in advance and pre-producing the core module, and the customer response period is long.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a hall tachometer sensor with high reliability.
The technical scheme adopted by the invention for solving the problems is as follows: the Hall speed sensor for rail transit comprises an integrated base, a low-pressure injection molding module, a tail pipe, an anti-rotation ring and a compression cap; a limiting mechanism is arranged between the inner cavity of the integrated base and the anti-rotation ring, and a phase positioning mechanism is arranged between the limiting mechanism and the low-pressure injection module; the inner cavity surface of the tail pipe is provided with a printed board mounting groove; the anti-rotation ring is sleeved on the tail pipe and is arranged in the inner cavity of the integrated base and limited by the limiting mechanism; the outer circular surface of the pressing cap is in threaded connection with the tail of the integrated shell, the front end of the pressing cap is provided with an anti-rotation ring extrusion surface, and when the pressing cap rotates, the anti-rotation ring is pressed by the extrusion anti-rotation ring extrusion surface, so that the low-pressure injection molding module is in close contact with and fixed on the integrated base; the low-pressure injection molding module comprises an internal core piece and a support piece, wherein the support piece is formed outside the internal core piece through plastic low-pressure injection molding, two parallel waist-shaped plane notches are formed in the outer cylindrical surface of the low-pressure injection molding module, and the surfaces of the waist-shaped plane notches are parallel to the plane of a printed board of the internal chip.
More specifically, the limiting mechanism between the inner cavity of the integrated seat and the anti-rotation ring is as follows: the inner cavity of the integrated shell is provided with a limiting groove, the outer circular surface of the ring of the anti-rotation ring is provided with two corresponding limiting convex grooves, and the limiting convex grooves are embedded into the limiting groove to limit.
More specifically, the phase positioning mechanism between the inner cavity of the integrated seat and the low-pressure injection molding module is as follows: the inner cavity of the integrated shell is provided with a phase clamping groove, and the excircle of the low-pressure injection molding module is matched with a phase orientation block.
Preferably, the number of the phase slots is two, and the two phase slots correspond to two speed measuring gears with different modules respectively.
Preferably, an error-proof notch is formed in one end of the outer cylindrical surface of the plastic tail pipe, and the error-proof notch is matched with an error-proof block on the low-pressure injection molding module, so that error proofing during assembly is realized.
Preferably, the end face of the double-thread pressing cap is provided with a tool hole which is matched with a special locking tool, and the double-thread pressing cap is screwed through the tool to be installed in place.
The manufacturing method of the Hall speed sensor for traffic is also provided, and comprises the following steps:
and 5, connecting and screwing the double-thread pressing cap and the tail part of the integrated shell by threads until the surfaces of the two are flush, and then performing subsequent assembly after welding the joint.
Preferably, the locking tool is clamped into a tool hole in the tail part of the double-thread pressing cap in the step 5, the locking tool is screwed by using an adjustable wrench, the thread pressing cap is driven to be screwed into the integrated shell until the surfaces of the two are flush, then the locking tool is removed, and the subsequent assembling step is carried out after the joint is welded.
The invention has the advantages that: 1. the production of the speed sensor for rail transit with metal shell protection is introduced into the low-pressure injection molding process to replace the traditional glue pouring process, so that the problem that the electric connection is damaged due to the huge internal stress generated by the heated expansion of the pouring glue in the closed metal cavity is successfully solved, and the long-term reliability of the product in a complex environment is improved; compared with the filling and sealing process, the low-pressure injection molding process has the advantages of short production period and high production efficiency, and can greatly shorten the production period of products. Tests prove that the product completely meets the use requirements.
2. Adopt integral type casing, inner core subassembly modularization isotructure, can obtain the hall speedtransmitter for rail transit that the commonality is good, high reliability, high manufacturability to can improve manufacturing efficiency.
Drawings
Fig. 1 is a schematic view of the overall structure of a hall revolution speed sensor according to an embodiment of the present invention.
Fig. 2 is a schematic perspective view of a hall tachometer base according to an embodiment of the present invention.
Fig. 3 is a schematic perspective view of a sensor module of a hall tachometer according to an embodiment of the present invention.
Fig. 4 is a schematic perspective view of a tail pipe of a hall revolution speed sensor according to an embodiment of the present invention.
Fig. 5 is a three-dimensional structural view of a hall revolution speed sensor anti-rotation ring according to an embodiment of the invention.
Fig. 6 is a schematic perspective view of a hall tachometer sensor clamp cap according to an embodiment of the present invention.
Fig. 7 is a schematic perspective view of another direction of a hall revolution speed sensor pressing cap according to an embodiment of the invention.
FIG. 8 is a schematic structural view of a sensor module, a plastic tail tube, an anti-rotation ring, and a cable assembly after assembly according to an embodiment of the invention.
Fig. 9 is a schematic view of the assembly of the integrated base and sensor module, the plastic tail tube, the anti-rotation ring and the cable assembly according to the embodiment of the invention.
Fig. 10 is a schematic structural diagram of the integrated base and sensor module, the plastic tail pipe, the anti-rotation ring and the cable assembly after being assembled according to the embodiment of the invention.
Fig. 11 is a perspective view of the integrated base of the present invention after being assembled with a sensor module, a plastic tail tube, an anti-rotation ring, and a cable assembly.
FIG. 12 is a schematic view of a tool used to tighten a clamp cap in accordance with an embodiment of the present invention.
Detailed Description
The invention is further explained by the embodiment in the following with the attached drawings.
As shown in figure 1, the Hall rotation speed sensor comprises an integrated base 1, a sensor module 2, a plastic tail pipe 3, a rotation-preventing ring 4, a pressing cap 5 and a cable assembly 6.
As shown in fig. 2, the inner cavity of the integrated base 1 is provided with two anti-rotation ring limiting grooves 11 and two phase clamping grooves 12 corresponding to speed measuring gears with different modulus, the anti-rotation ring limiting grooves 11 are used for being matched with the anti-rotation rings 4, the phase clamping grooves are used for being matched with phase orientation blocks on the low-pressure injection molding module 2, the tail part of the integrated base is provided with internal threads 13 for being connected with the double-thread compression cap 5, and the size of the internal cavity of the integrated base is in reference to the overall dimension of the low-pressure injection molding module 2 so as to realize small clearance fit between the two components.
As shown in fig. 3, the low-pressure injection molding module 2 is an integral module formed by low-pressure injection molding of an internal core member, and plays a role in centering the internal core member and physically isolating the internal core member from the integral housing 1 through a clearance fit relationship with an inner cavity of the integral housing 1, thereby improving the dielectric strength of the product.
Two parallel waist-shaped plane notches 21 are formed in the outer cylindrical surface of the low-pressure injection molding module 2, the surfaces of the waist-shaped plane notches 21 are parallel to the plane of a printed board of an internal chip, so that a cavity is formed between the low-pressure injection molding module 2 and the integrated shell 1 and is used for extruding injection molding materials when the injection molding materials expand due to heating, and the action of internal stress on an internal core piece is reduced.
The outer cylindrical surface of the low-pressure injection molding module 2 is also provided with a corresponding phase orientation block 22 which is matched with the phase clamping groove 12 in the inner cavity of the integrated shell 1, and the fixed-angle deflection of the inner core piece and the integrated shell 1 is realized in a mechanical positioning mode, so that the phase difference of two output signals of the speed sensor is controlled within 90 degrees +/-20 degrees.
The tail part of the low-pressure injection molding module 2 is also provided with a semicircular lug 23 which is used for matching with the plastic tail pipe 3 to realize error prevention during assembly of the two.
The Hall element mounting base at the head of the low-pressure injection molding module 2 is provided with an O-shaped ring groove 24, and an O-shaped ring is mounted on the O-shaped ring groove, so that the low-pressure injection molding module 2 and the integrated shell 1 are in interference fit at the head, and the vibration resistance of a product is improved.
Two exhaust grooves 25 are further designed at the position of the O-shaped ring groove of the Hall element mounting seat, so that the low-pressure injection molding module 2 can exhaust air when being mounted.
The welding part 29 of the tail part of the printed board and the cable in the inner core piece is exposed outside the low-pressure injection molding block, so that the welding part is convenient to weld with the cable subsequently, the low-pressure injection molding module 2 can form an independent module, the material preparation is convenient in advance, and the production period of products is shortened.
The exposed part of the printed board is also provided with two printed board positioning grooves 26 and a mistake proofing structure 27, so that the positioning and mistake proofing of the inner core piece and the cavity of the mold in the low-pressure injection molding process are facilitated.
The plastic tail pipe 3 is made of high-temperature-resistant plastic and is arranged at the tail part of the printed board and used for insulating and isolating the tail part of the printed board from the inner cavity of the integrated shell 1, the tail part of the printed board and the tail part of the low-pressure injection molding module 2 are assembled in a shaft hole relation, and the error proofing during assembly is realized through the error proofing groove 31 on the outer cylindrical surface, and the specific structure is shown in figure 4.
The anti-rotation ring 4 is installed on the plastic tail pipe 3, and the specific installation position is shown in fig. 4, and the traditional 2-channel hall speed sensor is not designed with the part. The structure of the injection molding device is shown in fig. 5, and the annular structure is provided with two limiting convex grooves 41 on the outer circumferential surface of the ring, and the two limiting convex grooves are used for being matched with the limiting grooves 11 in the inner cavity of the integrated shell 1 in fig. 2 to prevent the low-pressure injection molding module 2 from rotating relative to the integrated shell when being pressed.
As shown in fig. 6 and 7, the double-thread pressing cap 5 has an annular structure, an inner circular surface of the double-thread pressing cap is processed into an inner thread 51, a part of an outer circular surface is processed into an outer thread 52, the outer thread 52 is connected with the tail thread 13 of the integrated shell 1 in a matching manner, so that the thread specification is converted, meanwhile, the double-thread pressing cap 5 is further designed with an anti-rotation ring pressing surface 53, when the double-thread pressing cap is screwed into the inner cavity of the integrated shell 1 through threaded connection, the anti-rotation ring 4 is extruded, and after the anti-rotation ring 4 is extruded, the low-pressure injection molding module 2 is pushed forwards, so that the anti.
The end face of the double-thread pressing cap 5 is provided with two tool holes 54 which are used for being matched with a special locking tool, and the double-thread pressing cap 5 is screwed through the tool to be installed in place.
The manufacturing method of the Hall speed sensor for rail transit comprises the following steps:
and 7, moving the locking tool, removing the tool hole at the tail part of the double-thread pressing cap 7, removing the locking tool, welding the joint by using laser welding, sealing the integrated shell 1 and the double-thread pressing cap 7, screwing the pipe joint after welding, and performing subsequent assembly.
Claims (10)
1. Hall speedtransmitter for track traffic, its characterized in that: the device comprises an integrated base, a low-pressure injection molding module, a tail pipe, an anti-rotation ring and a compression cap; a limiting mechanism is arranged between the inner cavity of the integrated base and the anti-rotating ring, and a phase positioning mechanism is arranged between the inner cavity of the integrated base and the low-pressure injection mould; the inner cavity surface of the tail pipe is provided with a printed board mounting groove; the anti-rotation ring is sleeved on the tail pipe and is arranged in the inner cavity of the integrated base and limited by the limiting mechanism; the outer circular surface of the pressing cap is in threaded connection with the tail of the integrated shell, the front end of the pressing cap is provided with an anti-rotation ring extrusion surface, and when the pressing cap rotates, the anti-rotation ring is pressed by the extrusion anti-rotation ring extrusion surface, so that the low-pressure injection molding module is in close contact with and fixed on the integrated base; the low-pressure injection molding module comprises an internal core piece and a support piece, wherein the support piece is formed outside the internal core piece through plastic low-pressure injection molding, two parallel waist-shaped plane notches are formed in the outer cylindrical surface of the low-pressure injection molding module, and the surfaces of the waist-shaped plane notches are parallel to the plane of a printed board of the internal chip.
2. The hall velocity sensor for rail traffic of claim 1, wherein: the limiting mechanism between the inner cavity of the integrated seat and the anti-rotation ring is as follows: the inner cavity of the integrated shell is provided with a limiting groove, the outer circular surface of the ring of the anti-rotation ring is provided with two corresponding limiting convex grooves, and the limiting convex grooves are embedded into the limiting groove to limit.
3. The hall velocity sensor for rail traffic of claim 1, wherein: the phase positioning mechanism between the inner cavity of the integrated base and the low-pressure injection molding module is as follows: the inner cavity of the integrated shell is provided with a phase clamping groove, and the excircle of the low-pressure injection molding module is matched with a phase orientation block.
4. The hall velocity sensor for rail traffic of claim 3, wherein: the number of the phase slots is two, and the two phase slots correspond to two speed measuring gears with different modules respectively.
5. The hall velocity sensor for rail traffic of claim 1, wherein: and one end of the outer cylindrical surface of the tail pipe is provided with a mistake-proofing gap, and the mistake-proofing gap is matched with a mistake-proofing block on the low-pressure injection molding module.
6. The hall velocity sensor for rail traffic of claim 1, wherein: the end face of the pressing cap is provided with a tool hole which is matched with a special locking tool.
7. The hall velocity sensor for rail traffic of claim 1, wherein: an O-shaped ring groove is formed in the Hall element mounting seat at the head of the low-pressure injection molding module, and an O-shaped ring is mounted on the O-shaped ring groove.
8. The hall velocity sensor for rail traffic of claim 1, wherein: the exposed part of the printed board of the low-pressure injection molding module is provided with a printed board positioning groove and an error-proofing structure.
9. A manufacturing method of a Hall speed sensor for rail transit is characterized in that: the method comprises the following steps:
step 1, performing injection molding on an internal core piece to form a low-pressure injection molding module;
step 2, welding the cable wire to an exposed bonding pad of a printed board in the inner core piece, plugging a plastic tail pipe into the tail part of the low-voltage injection molding module, then vertically placing the components, and filling pouring sealant into a cavity of the plastic tail pipe to form a cable wire component;
step 3, mounting the anti-rotation ring on the tail part of the plastic tail pipe;
step 4, placing the assembly obtained in the step 3 into an integrated shell, and plugging a phase orientation block on the outer circular surface of the low-pressure injection molding module into a phase clamping groove in the integrated shell; the boss of the anti-rotation ring is aligned with and plugged into the groove of the integrated shell;
and 5, connecting and screwing the double-thread pressing cap and the tail part of the integrated shell by threads until the surfaces of the two are flush, and then performing subsequent assembly after welding the joint.
10. The method for manufacturing a hall speed sensor for traffic use according to claim 9, wherein: and in the step 5, a tool hole is formed in the tail part of the double-thread pressing cap, the locking tool is clamped into the tool hole in the tail part of the double-thread pressing cap, the locking tool is screwed by using an adjustable wrench, the thread pressing cap is driven to be screwed into the integrated shell until the surfaces of the two parts are flush, the locking tool is removed, and the subsequent assembling step is carried out after the joint is welded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710977863.8A CN107894513B (en) | 2017-10-19 | 2017-10-19 | Hall speed sensor for rail transit and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710977863.8A CN107894513B (en) | 2017-10-19 | 2017-10-19 | Hall speed sensor for rail transit and manufacturing method thereof |
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| CN107894513A CN107894513A (en) | 2018-04-10 |
| CN107894513B true CN107894513B (en) | 2020-04-07 |
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| CN110865208A (en) * | 2019-11-27 | 2020-03-06 | 湖南声仪测控科技有限责任公司 | Special tool for detecting Hall speed sensor |
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| CN202351458U (en) * | 2011-10-27 | 2012-07-25 | 中航光电科技股份有限公司 | Optical fiber connector with incoming line anti-rotation function and shell component thereof |
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| CN107894513A (en) | 2018-04-10 |
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