A modular contact engagement depth detector with wireless data transmission

Abstract

A modular contact engagement depth detector for wireless data transmission. The present invention aims to solve the problems in the prior art, such as unclear or complex sensor setting structure, cumbersome operation, inconvenient use, and inconvenience in wiring and detection caused by the use of data lines for transmission. The technical solution includes a shell, a displacement sensor, a top plate, a fixing structure, and a transmission circuit. The shell includes a front section, a rear section, and a mounting seat. The front port of the front section of the shell has a first limiting ring, the rear port has an internal thread and an external thread, the cylinder has an installation step ring, and the cylinder wall has a plurality of steel ball spring pressers. The displacement sensor is a self-recovering linear displacement sensor, which is locked in the front section of the shell. The transmission circuit is a wireless data transmission circuit board with a battery, which is installed on the rear side of the mounting seat. The mounting seat is threadedly engaged with the front end of the shell. The data output end of the displacement sensor is connected to the data input end of the circuit board. The rear section of the shell sleeves the circuit board in its cavity and is threadedly engaged with the front section of the shell.

Description

Technical Field

[0001] The invention relates to a special measuring instrument for a power equipment switch cabinet manufacturing enterprise, in particular to a modular contact engagement depth detector for wireless data transmission. Background Art

[0002] Switchgear is a type of electrical equipment used for opening, closing, controlling, and protecting power systems during power generation, transmission, distribution, and conversion. Currently, power equipment manufacturers that manufacture switchgear must inspect and adjust the engagement depth between the moving contacts of the circuit breaker on the handcart and the stationary contacts inside the switchgear before shipment to ensure optimal engagement in the operating position. Insufficient engagement between the moving and stationary contacts reduces the contact area, increasing contact resistance and potentially leading to contact overheating, arcing, and even damage. This can also cause weak or unstable contact during operation, compromising the mechanical stability of the circuit breaker. Excessive engagement can lead to excessive contact compression and damage during disconnection, compromising safe equipment operation and causing the contact arm to become stuck against the stationary contact, affecting proper operation. Therefore, inspecting and adjusting the engagement depth of the moving and stationary contacts before shipment is crucial, and accurate inspection is crucial.

[0003] Because the circuit breaker's static contacts are fixed inside the cabinet, while the moving contacts are mounted on the side of a trolley, the meshing occurs inside the enclosed circuit breaker chamber, making the depth of engagement impossible to observe from outside. The company's traditional measurement method involves applying a small amount of vaseline to the static contacts, pushing the trolley to the working position, then pulling the trolley out of the cabinet. The indentation left on the static contacts when the moving and static contacts engage is then measured. This primitive measurement method is cumbersome, subject to significant errors, and often results in unclear or even no visible indentation, making on-site measurement difficult.

[0004] Chinese patent publication No. CN105823410A proposes a circuit breaker contact engagement depth measurement device with a rational structure and guaranteed measurement accuracy. The device envisions installing a displacement sensor in the internal countersunk hole of the circuit breaker's moving contact. Power and signal lines are routed through the gap around the moving contact, out of the switchgear, and connected to a data processing device. However, the application lacks specific configuration and operating structure for the displacement sensor, making it unfeasible. Furthermore, the wired connection between the inside and outside of the switchgear would greatly inconvenience wiring and testing.

[0005] Chinese Patent Publication No. CN205537495U discloses an insertion depth measuring instrument for moving and static contacts of a central cabinet trolley, comprising a displacement sensor device and a bracket. The bracket supports the displacement sensor and mounts it within the moving contact. The bracket includes a conical housing for accommodating the displacement sensor device. The housing is provided with a limiter device at the top and bottom. The limiter device includes a wedge and a fastener for mounting the wedge to the housing. The inclined surface of the wedge mates with the inclined surface of the housing. The displacement sensor device utilizes a resistance scale displacement sensor. The resistance scale displacement sensor includes a measuring rod extending from the housing and having a baffle at its end that mates with the inner diameter of the moving contact. The bracket is fixed within the moving contact. The two contact surfaces of the wedge mate with the inner wall of the conductive rod of the moving contact and the inclined surface of the housing, respectively, to achieve self-locking. The displacement sensor device is connected to the display via a data cable. The diameter of the data cable is smaller than the distance between the fingers of the moving contact. One end of the data cable is provided with a plug-in connector, the thickness of which is smaller than the distance between the fingers of the moving contact. The disadvantages of this solution are: first, the matching structure between the wedge block, fastener and shell is unclear, and it is also unclear how the displacement sensor device is set in the shell, so the feasibility is low; second, the displacement sensor device passes through the gap between the contact fingers of the moving contact through the data cable and is connected to the display, which will bring a lot of inconvenience to the wiring and detection work; third, the displacement sensor device is directly connected to the display without any processing circuit in between, so the feasibility is problematic.

[0006] A central cabinet trolley insertion depth measuring instrument according to Chinese patent announcement No. CN210892994U comprises a moving contact and a static contact arranged on the left and right, the moving contact being fixedly connected to a moving contact finger at one end close to the static contact, a conical fixing bracket being arranged in the moving contact, a detection sensor being fixedly connected to the interior of the conical fixing bracket, an output end of the detection sensor being fixedly connected to a baffle corresponding to the static contact, the right end of the conical fixing bracket being fixedly connected to a fixing plate, a through hole communicating with the conical fixing bracket being provided on the surface of the fixing plate, two fixing blocks being symmetrically fixedly connected to the surface of the conical fixing bracket up and down, a through hole being provided on the side wall of the fixing block and a bolt being rotatably sleeved in the through hole, the right end of the bolt passing through the through hole provided on the surface of the fixing plate and extending out of the fixing plate, the left end of the bolt being threadedly connected to a self-locking clip, and the right side wall of the self-locking clip being provided with a threaded groove matching the bolt. The disadvantages of this solution are: first, the structure is complex, the operation is cumbersome, and it is inconvenient to use; second, it does not provide a method and means for the detection sensor to transmit the measurement information, nor does it provide how the detection sensor is set inside the conical fixed bracket, and its feasibility is low. Summary of the Invention

[0007] In order to overcome the problems existing in the prior art such as unclear sensor setting structure, complex fixing structure of the sensor fixing bracket in the moving contact, cumbersome operation, inconvenient use, and many inconveniences in using data cables to transmit information, wiring and detection, the purpose of the present invention is to provide an improved modular contact engagement depth detector with wireless data transmission, which can overcome the defects of the prior art.

[0008] The present invention solves its technical problems by adopting a technical solution: a modular contact engagement depth detector for wireless data transmission, comprising a housing, a displacement sensor, a top plate, a fixing structure, and a transmission circuit; wherein the displacement sensor is mounted in the housing, and the housing is fixed in the contact arm cavity of the circuit breaker's moving contact by the fixing structure; the measuring rod of the displacement sensor telescopically moves through the front end of the housing, and the top plate is mounted on the front end of the measuring rod; the housing is characterized in that: the housing comprises a front section, a rear section, and a mounting seat; the front section is a through-cylinder, the front end of which is provided with a radially protruding first limiting ring on the outside, the rear end of which is provided with a first internal thread and a first external thread, the middle of the cylinder is provided with a mounting step ring, and the surrounding cylinder walls are provided with a plurality of steel ball spring pressers as the fixing structure; the displacement sensor is a spring-loaded self-recovering linear displacement sensor, the front threaded section of the displacement sensor passes through the center hole of the mounting step ring in the front section of the housing, and a nut is engaged with the front threaded section to lock the displacement sensor in the front section of the housing; the transmission circuit is a circuit board with a battery for wireless data transmission, and the The outer side of the mounting seat is provided with a second external thread, and the rear side thereof is provided with a circuit board fixing screw hole, the second external thread of the mounting seat is engaged with the first internal thread of the front section of the shell, the front end of the circuit board is fixed to the circuit board fixing screw hole of the mounting seat by a screw, and the data output end of the displacement sensor is connected with the data input end of the circuit board; the front port of the rear section of the shell is provided with a second internal thread, the rear section of the shell puts the circuit board on the mounting seat into its cavity from its front port, and the second internal thread is engaged with the first external thread of the front section of the shell; the position The front end of the measuring rod of the displacement sensor is a threaded rod segment, and the threaded rod segment is equipped with a limit nut that limits the front end of the reset spring on the outer side of the measuring rod. A permanent magnet ring is sleeved on the threaded rod segment in front of the limit nut, and a locking nut is fitted on the threaded rod segment in front of the permanent magnet ring to lock the permanent magnet ring. The outer diameter of the top plate is equivalent to the outer diameter of the front end of the circuit breaker static contact, and the center of the top plate is a regular hexagonal hole that can be sleeved with the locking nut. The top plate is sleeved on the locking nut through its regular hexagonal hole and is fixed by being sucked by the permanent magnet ring.The transmission circuit is composed of a microcontroller, a Bluetooth module, a power supply circuit, a battery, a switch circuit, a sensor data input interface, and a program data input interface. The input terminal of the Bluetooth module, the output terminal of the sensor data input interface, and the output terminal of the program data input interface are respectively connected to corresponding I / O terminals of the microcontroller. The power supply terminal of the power supply circuit is respectively connected to the power supply terminals of the microcontroller, the Bluetooth module, the sensor data input interface, and the program data input interface. The input terminal of the switch circuit is connected to the output terminal of the battery, the output terminal of the switch circuit is connected to the input terminal of the power supply circuit, and the control terminal of the switch circuit is connected to the corresponding I / O terminal of the microcontroller.

[0009] In the displacement sensor described in the above technical solution, when the top plate is mounted on the locking nut through its regular hexagonal hole, it is immediately attracted by the permanent magnet ring. Without the need for other locking structures, the top plate can be quickly fixed to the front end of the measuring rod. This arrangement allows the detection meter to be used to detect the engagement depth of the moving and static contacts of circuit breakers of different specifications and sizes, and it is convenient to quickly replace the top plates with different outer diameters.

[0010] The outer side of the rear portion of the mounting seat in the above technical solution may be provided with a radially protruding second limiting ring that limits its mating position with the front section of the shell, so as to avoid installation position interference between the displacement sensor and the circuit board in the narrow installation space of the shell.

[0011] The circuit board may be provided with a button switch and an operation display light, and the rear section of the housing may be provided with operation and display windows for the button switch and the operation display light.

[0012] The periphery of the microcontroller described in the above technical solution can be provided with an operation display circuit, an automatic reset circuit and a data input circuit, wherein the input end of the operation display circuit, the output end of the automatic reset circuit and the output end of the data input circuit are respectively connected to the corresponding I / O ends of the microcontroller, the output end of the automatic reset circuit is also connected to the reset end of the microcontroller, the input end of the data input circuit is connected to the output end of the sensor data input interface, and the power supply end of the automatic reset circuit is connected to the power supply end of the power circuit.

[0013] The microcontroller can adopt an STM32 series or an alternative series of microcontrollers. The STM32 series microcontroller can adopt chips such as STM32F030F4P6 or STM32F051K8T6. The alternative series microcontroller can adopt chips such as CKS32F030F4P6 or CKS32F051K8T6. The Bluetooth module described in the above technical solution can adopt chips such as MX-01P or MX-01A. The spring-loaded self-recovering linear displacement sensor described in the above technical solution can adopt the spring-loaded self-recovering linear displacement sensor of Yice Electric LSM-2 or the spring-loaded self-recovering linear displacement sensor of Miran KTS-E.

[0014] The switching circuit of the above technical solution can be composed of a PMOS field effect transistor, an NMOS field effect transistor 1, an NMOS field effect transistor 2, resistors 1 to 5 and a push button switch, wherein the output end of the battery is connected to the drain of the PMOS field effect transistor in one way and to one end of the resistor 1 in another way, the source of the PMOS field effect transistor is connected to the input end of the switching circuit, the gate of the PMOS field effect transistor is connected to the other end of the resistor 1 in one way, to one end of the push button switch in another way, and to one end of the resistor 2 in another way, and the other end of the resistor 2 is connected to the drain of the PMOS field effect transistor in another way. The drain of the NMOS field-effect transistor 1 is terminated, the gate of the NMOS field-effect transistor 1 is connected to one end of resistor 3, the other end of resistor 3 is connected to the corresponding I / O terminal of the microcontroller in one path, and the other end is connected to one end of resistor 4, the source of the NMOS field-effect transistor 1 is grounded in one path, and the other end is connected to the other end of resistor 4, the other end of the push button switch is connected to one end of resistor 5, the other end of resistor 5 is connected to the gate of the NMOS field-effect transistor 2, the drain of the NMOS field-effect transistor 2 is connected to the corresponding I / O terminal of the microcontroller, and the source thereof is grounded.

[0015] The beneficial effects of the present invention are as follows: first, since the shell includes a shell front section, a shell rear section and a mounting seat, the shell front section is a through cylinder, the front port is provided with a radially protruding first limiting ring, the rear port is provided with a first internal thread and a first external thread, the middle of the cylinder is provided with a mounting step ring, and the surrounding cylinder walls are provided with a plurality of steel ball spring pressers as the fixing structure, so once the detector is inserted into the contact arm cavity of the circuit breaker moving contact, the plurality of steel ball spring pressers automatically press the surrounding cavity walls of the central cavity, conveniently fixing the detector in the contact arm cavity, and when taking out the detector, the detector can be directly pulled out, which is also very convenient; and the first limiting ring presses against the outer side of the contact arm cavity opening of the circuit breaker moving contact, so that the fixed position of the detector in the contact arm cavity is accurately defined. Secondly, since the displacement sensor adopts a spring-loaded self-recovering linear displacement sensor, the displacement sensor is securely fixed to the front section of the housing by having its front threaded section pass through the center hole of the mounting step ring in the front section of the housing, and a nut is engaged with the front threaded section to lock the displacement sensor in the front section of the housing. Therefore, the displacement sensor can be securely mounted and fixed in the front section of the housing, ensuring that the measuring rod of the displacement sensor can perform stable and accurate measurements. Thirdly, since the transmission circuit is a circuit board with a battery for wireless data transmission, the outer side of the mounting seat is provided with a second external thread, and the rear side is provided with a circuit board fixing screw hole. The mounting seat is engaged with the first internal thread of the front section of the housing by its second external thread, and the front end of the circuit board is fixed to the circuit board fixing screw hole of the mounting seat by a screw. The data output end of the displacement sensor is connected to the data input end of the circuit board, so that the circuit board for wireless data transmission can be securely mounted and fixed in the rear side of the front section of the housing, enabling the displacement sensor to transmit the measured dynamic and static contact engagement depth data in the dynamic and static contact engagement cavity by wireless transmission. It is directly transmitted to the background for data processing and display, which overcomes the problem that the existing technology uses a data line to pass through the gap between the contact fingers of the moving contact and then connect to the data processing and display device, which brings many inconveniences to the wiring and detection work, effectively improves the detection work efficiency, and is more advanced than the existing technology in terms of technical level; fourthly, because the front port of the rear section of the shell is provided with a second internal thread, the rear section of the shell puts the circuit board on the mounting seat into its cavity from its front port, and the second internal thread is matched with the first external thread of the front section of the shell, so the circuit board can be well protected, ensuring that the data of the circuit board directly set on the detection meter can be reliably transmitted wirelessly.

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 Schematic diagram of the longitudinal section.

[0019] Figure 3 yes Figure 1 A reduced-scale schematic diagram of the separated components.

[0020] Figure 4 yes Figure 1 A three-dimensional schematic diagram of the contact arm cavity installed in the circuit breaker moving contact.

[0021] Figure 5 yes Figure 3 A structural block diagram of the transmission circuit in FIG.

[0022] Figure 6 yes Figure 3 Another structural block diagram of the transmission circuit in .

[0023] Figure 7 yes Figure 3 A circuit schematic diagram of the transmission circuit in .

[0024] In the figure: 1. Housing; 2. Displacement sensor; 3. Top plate; 4. Transmission circuit; 5. Circuit breaker moving contact; 6. Measuring rod; 7. Front section of housing; 8. Rear section of housing; 9. Mounting seat; 10. First limiting ring; 11. First internal thread; 12. First external thread; 13. Mounting step ring; 14. Steel ball spring presser; 15. Front end threaded section; 16. Nut; 17. Circuit board; 18. Second external thread; 19. Circuit board fixing screw hole; 20. Screw; 21. Data output terminal; 22. Second internal thread; 23. Threaded rod section; 24. Reset spring; 25. Limiting nut; 26. Permanent magnet ring; 27. Locking nut; 28. Circuit breaker static contact; 29. ​​Regular hexagonal hole; 30. Push button switch; 31. Operation indicator light; 32. Contact arm; 33. Plum blossom contact; 34. Second limiting ring. DETAILED DESCRIPTION

[0025] Reference Figures 1 to 4, the modular contact engagement depth detector for wireless data transmission includes a shell 1, a displacement sensor 2, a top plate 3, a fixing structure and a transmission circuit 4; wherein the displacement sensor 2 is installed in the shell 1, and the shell 1 is fixed in the contact arm cavity of the circuit breaker moving contact 5 through a fixing structure; the measuring rod 6 of the displacement sensor 2 is telescopically moved through the front port of the shell 1, and the top plate 3 is installed at the front end of the measuring rod 6; it is characterized in that: the shell 1 includes a shell front section 7, a shell rear section 8 and a mounting seat 9, the shell front section 7 is a through cylinder, the outer side of the front port is provided with a radially protruding first limit ring 10, the rear port is provided with a first internal thread 11 and a first external thread 12, the middle of the cylinder is provided with a mounting step ring 13, and a plurality of steel ball spring pressers 14 are arranged on the surrounding cylinder walls as the fixing structure; the displacement sensor 2 adopts a spring self-recovering linear displacement sensor, and the displacement sensor 2 passes through the shell by its front end thread section 15 The center hole of the mounting step ring 13 of the front section 7 of the body is engaged with the front end threaded section 15 by a nut 16, thereby locking the displacement sensor 2 on the mounting step ring 13 in the front section 7 of the shell; the transmission circuit 4 is a circuit board 17 with a battery for wireless data transmission, the outer side of the mounting seat 9 is provided with a second external thread 18, and the rear side is provided with a circuit board fixing screw hole 19, the mounting seat 9 is engaged with the first internal thread 11 of the front section 7 of the shell by its second external thread 18, the front end of the circuit board 17 is mounted and fixed on the circuit board fixing screw hole 19 of the mounting seat 9 by a screw 20, and the data output end 21 of the displacement sensor 2 is connected to the data input end of the circuit board 17; the front port of the rear section 8 of the shell is provided with a second internal thread 22, and the rear section 8 of the shell puts the circuit board 17 on the mounting seat 9 into its cavity from its front port, and engages with the first external thread 12 of the front section 7 of the shell by its second internal thread 22.

[0026] Furthermore, the front end of the measuring rod 6 of the displacement sensor 2 is a threaded rod segment 23. A stop nut 25 is fitted onto this threaded rod segment 23, securing the front end of a return spring 24 on the outside of the measuring rod 6. A permanent magnet ring 26 is mounted on the threaded rod segment 23 in front of the stop nut 25. A lock nut 27 is fitted onto this permanent magnet ring 26 in front of the permanent magnet ring 26. The outer diameter of the top plate 3 is comparable to the outer diameter of the front end of the circuit breaker's static contact 28, and its center is defined by a regular hexagonal hole 29 that fits snugly within the lock nut 27. When the top plate 3 is fitted onto the lock nut 27 through its regular hexagonal hole 29, it is immediately attracted to the permanent magnet ring 26, allowing it to be quickly secured to the front end of the measuring rod 6 without requiring any additional locking mechanism. This allows for quick and easy replacement of top plates 3 with different outer diameters when the sensor is used to measure the engagement depth of the moving and static contacts of circuit breakers of varying sizes.

[0027] A radially protruding second limiting ring 34 is provided on the rear side of the mounting seat 9 to define its mating position with the shell front section 7, so as to avoid installation position interference between the displacement sensor 2 and the circuit board 17 in the narrow installation space of the shell 1.

[0028] The circuit board 17 is provided with a button switch 30 and an operation display light 31 , and the rear section 8 of the housing is provided with operation and display windows (not shown) for the button switch 30 and the operation display light 31 .

[0029] Reference Figure 5 The transmission circuit 4 is composed of a microcontroller, a Bluetooth module, a power supply circuit, a battery, a switch circuit, a sensor data input interface, and a program data input interface, wherein the input terminal a of the Bluetooth module, the output terminal b of the sensor data input interface, and the output terminal c of the program data input interface are respectively connected to the corresponding I / O terminals of the microcontroller, the power supply terminal of the power supply circuit is respectively connected to the power supply terminal VCC of the microcontroller, the Bluetooth module, the sensor data input interface, and the program input interface, the input terminal d of the switch circuit is connected to the output terminal of the battery, the output terminal e of the switch circuit is connected to the input terminal of the power supply circuit, and the control terminal f of the switch circuit is connected to the corresponding I / O terminal of the microcontroller.

[0030] Reference Figure 6 ,exist Figure 5On the basis of the above, the periphery of the microcontroller is also connected to an operation display circuit, an automatic reset circuit and a data input circuit; wherein the input terminal g of the operation display circuit, the output terminal h of the automatic reset circuit and the output terminal j of the data input circuit are respectively connected to the corresponding I / O terminals of the microcontroller, wherein the output terminal h of the automatic reset circuit is also connected to the reset terminal k of the microcontroller, the input terminal of the data input circuit is connected to the output terminal b of the sensor data input interface, and the power supply terminal VCC of the automatic reset circuit is connected to the power supply terminal of the power circuit.

[0031] Reference Figure 7 Circuit schematic diagram, the transmission circuit 4 is composed of a microcontroller, a Bluetooth module, a power supply circuit, a battery, a switch circuit, a sensor data input interface and a program data input interface, wherein the microcontroller U1 adopts the chip of the STM32 series model STM32F030F4P6, its 6-13 pins and 17-20 pins are a total of 12 I / O terminals, its 16-pin power terminal VCC, its 15-pin is the ground terminal, its 4-pin is the reset terminal, and its 1-pin is grounded through a resistor R1; the Bluetooth module U2 adopts the chip of the signal MX-01P, with a built-in There is an antenna, its 14 and 13 pins are input terminals, its 2 and 15 pins are ground terminals, and its 3 pin is the power supply terminal VCC; the power supply circuit is composed of an inductor L, resistors R2-R3, capacitors C1-C6, and a voltage regulator chip U3 of model HT7533-1; the battery is Vbat; the switching circuit is composed of a PMOS field effect transistor Q1, an NMOS field effect transistor Q2, an NMOS field effect transistor Q3, resistors R4-R8 and a button switch S; the sensor data input interface is J1; the program data input interface is J2.

[0032] The circuit structure of the switching circuit is that the output end of the battery Vbat is connected to the drain of the PMOS field effect transistor Q1 in one path, and is connected to one end of the resistor R4 in the other path; the source of the PMOS field effect transistor Q1 is connected to the outer end of the inductor L at the input end of the power supply circuit; the gate of the PMOS field effect transistor Q1 is connected to the other end of the resistor R4 in one path, is connected to one end of the push button switch S in another path, and is connected to one end of the resistor R5 in another path; the other end of the resistor R5 is connected to the drain of the NMOS field effect transistor Q2, and the NMOS field The gate of the first NMOS field effect transistor Q2 is connected to one end of a resistor R6, the other end of which is connected to the corresponding I / O terminal pin 12 of the microcontroller U1 and to one end of a resistor R7. The source of the first NMOS field effect transistor Q2 is connected to ground and to the other end of the resistor R7. The other end of the push button switch S is connected to one end of a resistor R8, the other end of which is connected to the gate of the second NMOS field effect transistor Q3. The drain of the second NMOS field effect transistor Q3 is connected to the corresponding I / O terminal pin 13 of the microcontroller U1 and its source is grounded. One end of a capacitor C7 is also connected to the connection line between the output end of the battery Vbat and the drain of the PMOS field effect transistor Q1, and the other end of the capacitor C7 is grounded.

[0033] The circuit structure of the power supply circuit is that the inner end of the inductor L is connected to one end of the resistor R2, the other end is connected to one end of the capacitor C1, and then to the end of the capacitor C3, and then to the Vin end of the voltage regulator chip U3; the other end of the resistor R2 is connected to one end of the resistor R3, and the other end is connected to one end of the capacitor C2; the other end of the resistor R3 and the other end of the capacitor C2 are grounded together; the Vout end of the voltage regulator chip U3 is connected to one end of the capacitor C4, then to one end of the capacitor C5, and then to one end of the capacitor C6; the other ends of the capacitors C4, C5, and C6 are grounded together, and the connection points of the capacitors C4 and C6 with the Vout end of the voltage regulator chip U3 respectively serve as the power supply end VCC of the power supply circuit.

[0034] Pin 2 of the sensor data input interface J1 is a data transmission pin, connected to the corresponding I / O terminal pin 11 of the microcontroller U1; a data input circuit is also connected between pin 2 of the sensor data input interface J1 and pin 11 of the microcontroller U1, and the data input circuit is composed of a resistor R9 and capacitors C7-C8. The circuit structure is that pin 2 of the sensor data input interface J1 is connected to one end of the resistor R9 in one way and to one end of the capacitor C8 in the other way, the other end of the resistor R9 is connected to pin 11 of the microcontroller U1 in one way and to one end of the capacitor C7 in the other way, the other end of the capacitor C7 is grounded, the other end of the capacitor C8 is grounded in one way and to pin 3 of the sensor data input interface J1 in the other way, and pin 1 of the sensor data input interface J1 is the power supply terminal VCC.

[0035] Pins 3 and 4 of the program data input interface J2 are data transmission pins, which are respectively connected to the corresponding I / O pins 19 and 20 of the microcontroller U1. Pin 5 of the program data input interface J2 is connected to the reset pin 4 of the microcontroller U1. Pin 1 of the program data input interface J2 is the power supply terminal VCC, and pin 2 of the program data input interface J2 is the ground pin.

[0036] The operation display circuit outside the microcontroller U1 is composed of a resistor R10 and a light-emitting diode D, wherein one end of the resistor R10 is connected to the corresponding I / O terminal 7 of the microcontroller U1, the other end of the resistor R10 is connected to the positive electrode of the light-emitting diode D, and the negative electrode of the light-emitting diode D is grounded.

[0037] The automatic reset circuit around the microcontroller U1 is composed of a resistor R11 and a capacitor C9, wherein one end of the resistor R11 is the power supply terminal VCC, the other end of the resistor R11 is connected to the reset terminal pin 4 of the microcontroller U1, the other end is connected to one end of the capacitor C9, and the other end is connected to pin 5 of the program data input interface J2. The other end of the capacitor C9 is grounded.

[0038] When using, Figure 1 State, press the button switch 30 from the operation and display window on the rear section 8 of the housing, the operation display light 31 lights up, and the detector enters the working state; then Figure 4 As shown, the detector is placed into the inner cavity of the contact arm 32 of the circuit breaker moving contact 5 until the first limiting ring 10 of the housing front section 7 presses against the inner cavity edge of the contact arm 32. The plurality of steel ball spring pressers 14 on the housing front section 7 press against the inner cavity wall of the contact arm 32, so that the detector is automatically fixed in the cavity of the contact arm 32. At this time, the top plate 3 is in the initial engagement position of the plum blossom contact 33. When the circuit breaker moving contact 5 moves toward the circuit breaker static contact 28, the circuit breaker static contact 28 When entering the plum blossom contact 33 of the circuit breaker moving contact 5 and engaging with it, the top plate 3 is pushed to make the measuring rod 6 compress the reset spring 24 and move into the displacement sensor 2. When the circuit breaker moving contact 5 and the circuit breaker static contact 28 are engaged in place, the moving distance of the measuring rod 6 is the engagement depth of the circuit breaker moving contact 5 and the circuit breaker static contact 28. The displacement sensor 2 then wirelessly sends the moving distance data of the measuring rod 6 to the background through the Bluetooth module on the circuit board 17 for processing and display.

[0039] Reference Figure 7Circuit principle: when the button switch S is not pressed, the NMOS field effect tube Q2 and the NMOS field effect tube Q3 are in the cut-off state, and the battery Vbat gives the gate of the PMOS field effect tube Q1 a high level through the resistor R4. The PMOS field effect tube Q1 is cut off, the power circuit has no power, and its power supply terminal VCC does not provide power. At this time, the detector does not work; when the button switch S is pressed, the battery Vbat gives the gate of the NMOS field effect tube Q3 a high level through the resistors R4 and R8. The NMOS field effect tube Q3 is turned on, and the microcontroller U1 starts. When the microcontroller U1 detects that its 13th pin is grounded, it controls its 12th pin to output a high level. At this time, the gate of the NMOS field effect tube Q2 obtains a high level through the resistor R6, and the NMOS field effect tube Q2 is turned on, making the PM The gate of the OS field effect transistor Q1 is grounded through R5, and the high level becomes a low level. At this time, the PMOS field effect transistor Q1 is turned on, the battery Vbat supplies power to the power supply circuit, and the power supply end VCC of the power supply circuit outputs power, and the detector enters the working state; when the push button switch S is released, the NMOS field effect transistor Q3 is turned off, but the 12th pin of the microcontroller remains at a high level, and the PMOS field effect transistor Q1 remains in the on-power supply state; to turn off the working state of the detector, press the push button switch S for more than three seconds and then release it. The microcontroller U1 detects that its 13th pin has been grounded for more than three seconds, and then controls its 12th pin to become a low level, the NMOS field effect transistor Q2 is turned off, the gate of the PMOS field effect transistor Q1 becomes a high level, the PMOS field effect transistor Q1 is turned off, and the microcontroller U1 loses power and stops working. When the meter enters operation, the displacement sensor 2 inputs the distance traveled by the measuring rod 6 via the sensor data input interface J1. This data is then transmitted via the data input circuit to pin 11 of the microcontroller U1. The microcontroller U1 processes the data and controls the Bluetooth module U2 to wirelessly transmit the data to the backend for processing and display via pins 8 and 9. The operating program of the microcontroller U1 is implemented by pre-programming software that is installed into the microcontroller U1 via the program data input interface J2.

Claims

1. A modular contact engagement depth detector for wireless data transmission, comprising a housing, a displacement sensor, a top plate, a fixing structure, and a transmission circuit; wherein the displacement sensor is mounted within the housing, and the housing is fixed within a contact arm cavity of a circuit breaker's moving contact via the fixing structure; a measuring rod of the displacement sensor is telescopically movable through a front port of the housing, and the top plate is mounted on the front end of the measuring rod; and wherein: The shell includes a shell front section, a shell rear section and a mounting seat. The shell front section is a through cylinder, the outer side of the front port is provided with a radially protruding first limiting ring, the rear port is provided with a first internal thread and a first external thread, the middle of the cylinder is provided with a mounting step ring, and a plurality of steel ball spring pressers are arranged on the surrounding cylinder walls as the fixing structure; the displacement sensor adopts a spring self-recovering linear displacement sensor, the displacement sensor is passed through the center hole of the mounting step ring in the shell front section by its front end thread section, and a nut is fitted on the front end thread section to lock the displacement sensor in the shell front section; the transmission circuit The invention relates to a circuit board for wireless data transmission with a battery. The outer side of the mounting base is provided with a second external thread, and the rear side thereof is provided with a circuit board fixing screw hole. The second external thread of the mounting base engages with the first internal thread of the front section of the housing. The front end of the circuit board is fixed to the circuit board fixing screw hole of the mounting base by screws. The data output end of the displacement sensor is connected to the data input end of the circuit board. The front port of the rear section of the housing is provided with a second internal thread. The rear section of the housing is provided with a second internal thread. The rear section of the housing is provided with a cavity of the circuit board on the mounting base through the front port, and the second internal thread engages with the first external thread of the front section of the housing. The front end of the measuring rod of the displacement sensor is a threaded rod segment, and the threaded rod segment is equipped with a limiting nut that limits the front end of the reset spring on the outside of the measuring rod. A permanent magnet ring is sleeved on the threaded rod segment in front of the limiting nut, and a locking nut is fitted on the threaded rod segment in front of the permanent magnet ring to lock the permanent magnet ring. The outer diameter of the top plate is equivalent to the outer diameter of the front end of the static contact of the circuit breaker, and the center is a regular hexagonal hole that can be sleeved with the locking nut. The top plate is sleeved on the locking nut by its regular hexagonal hole and is fixed by being sucked by the permanent magnet ring; the transmission circuit is composed of a microcontroller, a blue The microcontroller comprises a Bluetooth module, a power supply circuit, a battery, a switching circuit, a sensor data input interface and a program data input interface, wherein the input end of the Bluetooth module, the output end of the sensor data input interface and the output end of the program data input interface are respectively connected to the corresponding I / O ends of the microcontroller, the power supply end of the power supply circuit is respectively connected to the power supply ends of the microcontroller, the Bluetooth module, the sensor data input interface and the program data input interface, the input end of the switching circuit is connected to the output end of the battery, the output end of the switching circuit is connected to the input end of the power supply circuit, and the control end of the switching circuit is connected to the corresponding I / O end of the microcontroller.

2. The modular contact engagement depth detector for wireless data transmission according to claim 1, characterized in that: A radially protruding second limiting ring is provided on the outer side of the rear portion of the mounting seat to limit the matching position between the mounting seat and the front section of the shell.

3. The modular contact engagement depth detector for wireless data transmission according to claim 1 or 2, characterized in that: The circuit board is provided with a button switch and an operation display light, and the rear section of the shell is provided with operation and display windows for the button switch and the operation display light.

4. The modular contact engagement depth detector for wireless data transmission according to claim 1 or 2, characterized in that: The periphery of the microcontroller is also provided with an operation display circuit, an automatic reset circuit and a data input circuit, wherein the input end of the operation display circuit, the output end of the automatic reset circuit and the output end of the data input circuit are respectively connected to the corresponding I / O ends of the microcontroller, the output end of the automatic reset circuit is also connected to the reset end of the microcontroller, the input end of the data input circuit is connected to the output end of the sensor data input interface, and the power supply end of the automatic reset circuit is connected to the power supply end of the power circuit.

5. The modular contact engagement depth detector for wireless data transmission according to claim 4, characterized in that: The switch circuit is composed of a PMOS field effect transistor, an NMOS field effect transistor 1, an NMOS field effect transistor 2, resistors 1 to 5 and a push button switch, wherein the output end of the battery is connected to the drain of the PMOS field effect transistor in one way and to one end of the resistor 1 in another way, the source of the PMOS field effect transistor is connected to the input end of the switch circuit, the gate of the PMOS field effect transistor is connected to the other end of the resistor 1 in one way, to one end of the push button switch in another way, and to one end of the resistor 2 in another way, and the other end of the resistor 2 is connected to the The drain of NMOS field-effect transistor 1, the gate of NMOS field-effect transistor 1 is connected to one end of resistor 3, the other end of resistor 3 is connected to the corresponding I / O end of the microcontroller in one path, and the other end is connected to one end of resistor 4, the source of NMOS field-effect transistor 1 is grounded in one path, and the other end is connected to the other end of resistor 4, the other end of the push button switch is connected to one end of resistor 5, the other end of resistor 5 is connected to the gate of NMOS field-effect transistor 2, the drain of NMOS field-effect transistor 2 is connected to the corresponding I / O end of the microcontroller, and the source of NMOS field-effect transistor 2 is grounded.

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