Mechanical contact contact state detection device and method

Abstract

The application discloses a kind of mechanical contact contact state detection device and method, it is related to circuit detection device field, it solves the problem that the detection precision is insufficient due to the poor interference factor shielding effect when using existing mechanical contact contact state detection device, including bottom plate, fixed frame, top plate, detection mechanism and auxiliary mechanism, detection mechanism includes U2 constant voltage source, R1 resistance, R2 resistance, R3 loop resistance, V1 voltage acquisition module and V2 voltage acquisition module, the voltage of the two ends of standard precision resistance R1 resistance is measured by V1 voltage acquisition module, the actual output voltage of U2 constant voltage source is tracked in real time by V2 voltage acquisition module, the resistance of R3 loop resistance is obtained by formula calculation, eliminate the error caused by power fluctuation, the opening and closing state of the whole adjusting equipment of lifting equipment of top plate is controlled by auxiliary mechanism, and metal shielding is carried out when closing, reduce external interference, open top plate after detection is completed and carry out output detection data, and improve heat dissipation efficiency.

Description

Technical Field

[0001] This invention relates to the field of circuit testing device technology, specifically to a mechanical contact state testing device and method. Background Technology

[0002] In electrical control, signal transmission, and mechatronics equipment, mechanical contacts are core components of relays, connectors, switches, and other devices. Their contact state directly determines the stability of equipment operation and the reliability of signal transmission. Problems such as abnormal contact resistance and poor contact can easily lead to equipment failure, signal interruption, or even safety accidents. Therefore, accurate detection of the contact state of mechanical contacts is a key link to ensure the normal operation of various electromechanical equipment.

[0003] Existing mechanical contact status detection devices generally employ a constant voltage source combined with single-channel voltage acquisition. They calculate the contact resistance by collecting the voltage signal across the contact points to determine the contact status. However, this traditional method has significant technical drawbacks in practical industrial applications: Firstly, strong electromagnetic interference is generated during the operation of electromechanical equipment, and high-frequency ripple signals exist in the power supply circuit. These interference signals are directly superimposed on the voltage acquisition signal, leading to distorted and inaccurate voltage data that fails to accurately reflect the actual contact resistance of the mechanical contacts, resulting in misjudgments of the contact status. Secondly, the power supply voltage of the detection device is prone to significant fluctuations with changes in equipment load, making it impossible to maintain a constant reference voltage. This further exacerbates the instability of the detection results, making it difficult to achieve high-precision and stable detection of mechanical contact status. Furthermore, existing mechanical contact status detection devices often use enclosed, fixed housings. These enclosed housings have poor heat dissipation performance, preventing the rapid dissipation of heat generated by components such as the detection module and power supply module during prolonged operation. This heat accumulation can lead to component performance degradation and decreased detection accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide a mechanical contact state detection device and method that facilitates improved detection accuracy and equipment operation efficiency, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a mechanical contact state detection device, comprising a base plate, a detection mechanism, and an auxiliary mechanism. A fixed frame is fixedly connected to the upper outer edge of the base plate, and a top plate is provided on the upper side of the fixed frame. The detection mechanism includes a U2 constant voltage source, resistors R1, R2, and R3, a V1 voltage acquisition module, and a V2 voltage acquisition module, all fixedly mounted on the base plate. Resistors R1 and R2 are standard high-precision resistors. The voltage across the standard high-precision resistor R1 is measured by the V1 voltage acquisition module. The V2 voltage acquisition module tracks the actual output voltage of the U2 constant voltage source in real time and calculates the resistance value of the R3 circuit resistor through a formula to eliminate errors caused by power fluctuations. The auxiliary mechanism is installed on the top plate and is used to adjust the opening and closing state of the entire device by controlling the lifting and lowering of the top plate. When closed, it provides metal shielding to reduce external interference. After the test is completed, the top plate is opened to output the internal test data, while improving heat dissipation efficiency. It is easy to form a metal box that fully encloses the internal test mechanism through the bottom plate, top plate and fixed frame to shield external electromagnetic interference.

[0006] Preferably, the detection mechanism further includes a controller fixedly installed above the base plate. The controller is used to collect data from the U2 constant voltage source, the R1 resistor, the R2 resistor, the V1 voltage acquisition module, and the V2 voltage acquisition module, and calculate the value of the R3 loop resistance. The outer wall of the fixed frame is fixedly connected with two sets of terminals that can be connected to the R3 loop resistor to form a loop, which facilitates the calculation of the resistance value of the R3 loop resistor and eliminates errors caused by power fluctuations.

[0007] Preferably, the auxiliary mechanism further includes heat dissipation fins fixedly installed below the base plate and above the top plate. A fixed frame is fixedly connected to the base plate, and two sets of lifting frames are slidably connected to the fixed frame in the vertical direction. Each lifting frame is fixedly connected to a heat dissipation fan. Multiple openings are provided on the fixed frame, and heat dissipation components are provided on the fixed frame. When the openings are closed, the heat dissipation components can control the heat dissipation fans to move to the position of the heat dissipation fins for heat dissipation. When the openings are open, the heat dissipation fans are linked to move to the position of the openings to dissipate heat inside the fixed frame. This facilitates the adjustment of the overall opening and closing state of the device by controlling the lifting of the top plate, and provides metal shielding when closed to reduce external interference. After the test is completed, the top plate is opened to output the internal test data, while improving heat dissipation efficiency.

[0008] Preferably, the heat dissipation component includes a fixed cylinder fixedly installed on the fixed frame. A piston rod is slidably connected in the horizontal direction inside the fixed cylinder. A push-pull frame is fixedly connected to the end of the piston rod away from the fixed cylinder. Two sets of rotating rods are rotatably connected to the push-pull frame. The two sets of rotating rods are rotatably connected to the sides of the upper and lower lifting frames, respectively. The two lifting frames are located on the upper and lower sides of the push-pull frame, respectively. The fixed frame is provided with a control component for controlling the lifting of the top plate and simultaneously adjusting the piston rod by sliding. This facilitates controlling the heat dissipation fan to move to the position of the heat dissipation fins for heat dissipation when the opening is closed, and controlling the heat dissipation fan to move to the position of the opening to dissipate heat inside the fixed frame when the opening is open.

[0009] Preferably, the control component includes a hydraulic control pump fixedly installed on the fixed frame, a hydraulic cylinder fixedly connected to the fixed frame, a hydraulic rod slidably connected to the inner wall of the hydraulic cylinder, the bottom end of the hydraulic rod being fixedly connected to the top surface of the top plate, a connecting pipe communicating with one end of the fixed cylinder on the hydraulic cylinder, and the output end of the hydraulic control pump communicating with the middle part of the connecting pipe, which facilitates the control of the lifting and lowering of the top plate and can simultaneously link the piston rod for sliding adjustment.

[0010] Preferably, guide grooves are provided on both sides of the opening and closing port, and a plug-in plate that can be inserted into the opening and closing port in a vertical direction is fixedly connected to the bottom of the top plate. Guide rods that are slidably connected to the inner wall of the guide groove are fixedly connected to both sides of the plug-in plate. A lifting frame that is slidably connected to the inner wall of the fixed frame in a vertical direction is fixedly connected to the bottom surface of the top plate, which facilitates the opening and closing control of the box and improves the switching efficiency of signal transmission and metal shielding.

[0011] Preferably, a guide frame is fixedly connected to the side of the base plate, and a sliding block is slidably connected in the horizontal direction inside the guide frame. The sliding block is provided with a wire. The side of the sliding block near the U2 constant voltage source can contact the U2 constant voltage source and charge the U2 constant voltage source. The bottom of the plug-in plate near the sliding block is provided with a slope. The upper side of the end of the sliding block near the U2 constant voltage source is designed with a slope. The slope can slide in contact with the slope of the sliding block. The end of the sliding block away from the U2 constant voltage source is fixedly connected to an elastic element fixedly connected to the guide frame, which facilitates the linkage control of the charging status of the U2 constant voltage source during the lifting and lowering of the plug-in plate.

[0012] Preferably, a grounding wire is fixedly connected to the side of the base plate, which facilitates single-wire grounding of the metal shielding box, forming a Faraday cage to shield external electromagnetic interference, eliminate static electricity, and avoid noise introduced by ground loops, thus ensuring detection accuracy.

[0013] Preferably, a sealing groove is provided on the upper side of the fixed frame, and a conductive rubber sealing ring that can be inserted into the sealing groove is fixedly connected to the bottom surface of the top plate. This ensures the continuity of the overall electromagnetic shielding of the metal box, and also achieves sealing and buffering, thereby improving the anti-interference and protection effects.

[0014] A detection method for a mechanical contact state detection device includes the following steps: S1. The voltage across the standard precision resistor R1 is measured using the V1 voltage acquisition module, and the actual output voltage of the constant voltage source U2 is tracked in real time using the V2 voltage acquisition module; S2. Through formula The resistance value of the R3 circuit is calculated to eliminate errors caused by power supply fluctuations; S3. By controlling the overall opening and closing state of the lifting and adjusting device of the top plate, and by providing metal shielding when closed, external interference with the test results is reduced. After the test is completed, the top plate is opened to output the internal test data, while improving heat dissipation efficiency.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention provides a mechanical contact state detection device and method, which solves the problem of insufficient detection accuracy caused by poor shielding of interference factors in existing mechanical contact state detection devices. The device measures the voltage across a standard precision resistor R1 using a voltage acquisition module V1, and tracks the actual output voltage of a constant voltage source U2 in real time using a voltage acquisition module V2. The resistance value of the R3 circuit is calculated using a formula to eliminate errors caused by power fluctuations. An auxiliary mechanism controls the opening and closing state of the device by adjusting the lifting of the top plate, and provides metal shielding when closed to reduce external interference. After detection, the top plate is opened to output the internal detection data, while also improving heat dissipation efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the auxiliary mechanism of the present invention; Figure 3 This is a partial structural cross-sectional view of the auxiliary mechanism of the present invention; Figure 4 for Figure 3 Enlarged view of region A in the middle; Figure 5 This is a partial structural breakdown diagram of the auxiliary mechanism of the present invention; Figure 6 for Figure 5 Enlarged view of region B in the middle; Figure 7This is a partial structural diagram of the detection mechanism of the present invention; Figure 8 for Figure 7 Enlarged view of region C; Figure 9 This is a top view of a partial structure of the detection mechanism of the present invention; Figure 10 This is a circuit diagram of the detection mechanism of the present invention.

[0017] In the diagram: 1-Base plate; 2-Fixing frame; 3-Top plate; 4-U2 constant voltage source; 5-R1 resistor; 6-R2 resistor; 7-R3 circuit resistor; 8-V1 voltage acquisition module; 9-V2 voltage acquisition module; 10-Controller; 11-Terminal; 12-Heat dissipation fins; 13-Fixing frame; 14-Lifting frame; 15-Cooling fan; 16-Opening port; 17-Fixing cylinder; 18-Piston rod; 19-Push-pull frame; 20-Rotating rod; 21-Control component; 22-Hydraulic control pump; 23-Hydraulic cylinder; 24-Hydraulic rod; 25-Connecting pipe; 27-Guide groove; 28-Plug-in plate; 29-Guide rod; 30-Lifting frame; 31-Guide frame; 32-Sliding block; 33-Wire; 34-Slope; 35-Elastic component; 36-Grounding wire; 37-Sealing groove; 38-Conductive rubber sealing ring. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-10This invention provides a technical solution: a mechanical contact state detection device, including a base plate 1, a detection mechanism, and an auxiliary mechanism. A fixed frame 2 is fixedly connected to the outer edge of the upper part of the base plate 1, and a top plate 3 is provided on the upper side of the fixed frame 2. The detection mechanism includes a U2 constant voltage source 4, an R1 resistor 5, an R2 resistor 6, an R3 loop resistor 7, a V1 voltage acquisition module 8, and a V2 voltage acquisition module 9, all fixedly installed on the base plate 1. The R1 resistor 5 and the R2 resistor 6 are both standard high-precision resistors. The voltage across the standard precision resistor R1 resistor 5 is measured by the V1 voltage acquisition module 8, and the actual output voltage of the U2 constant voltage source 4 is tracked in real time by the V2 voltage acquisition module 9. The resistance value of the R3 loop resistor 7 is calculated by formula to eliminate errors caused by power fluctuations. The auxiliary mechanism is installed on the top plate 3 and is used to adjust the opening and closing state of the device by controlling the lifting and lowering of the top plate 3. When closed, it provides metal shielding to reduce external interference. After the detection is completed, the top plate 3 is opened to output the internal detection data, while improving heat dissipation efficiency. A grounding wire 36 is fixedly connected to the side of the base plate 1.

[0020] Please see Figures 2-9 The detection mechanism shown in the diagram also includes a controller 10 fixedly installed above the base plate 1. The controller 10 is used to collect data from the U2 constant voltage source 4, R1 resistor 5, R2 resistor 6, V1 voltage acquisition module 8, and V2 voltage acquisition module 9, and calculates the value of the R3 loop resistance 7. Two sets of terminals 11 that can be connected to the outer wall of the fixed frame 2 to form a loop with the R3 loop resistance 7 are fixedly connected. The terminals 11 are preferably glass sintered sealed shielded terminals 11 to improve the shielding effect. The opening 16... Guide grooves 27 are provided on both sides. The bottom of the top plate 3 is fixedly connected to a plug plate 28 that can be inserted into the opening 16 in the vertical direction. Guide rods 29 that are slidably connected to the inner wall of the guide groove 27 are fixedly connected to both sides of the plug plate 28. A lifting frame 30 that is slidably connected to the inner wall of the fixed frame 2 in the vertical direction is fixedly connected to the bottom surface of the top plate 3. The bottom plate 1, the fixed frame 2, the plug plate 28, the lifting frame 30 and the top plate 3 are all made of cold-rolled steel plate, which makes it easy to form a metal box when closed and realize the metal shielding function.

[0021] Please see Figures 2-8The auxiliary mechanism shown in the figure also includes heat dissipation fins 12 fixedly installed below the base plate 1 and above the top plate 3. A fixed frame 13 is fixedly connected to the base plate 1. Two sets of lifting frames 14 are slidably connected to the fixed frame 13 in the vertical direction. A heat dissipation fan 15 is fixedly connected to each of the lifting frames 14. Multiple openings 16 are opened on the fixed frame 2. Heat dissipation components are provided on the fixed frame 13. When the openings 16 are closed, the heat dissipation components can control the heat dissipation fan 15 to move to the position of the heat dissipation fins 12 for heat dissipation. When the openings 16 are open, the heat dissipation fan 15 is linked to move to the position of the openings 16 to dissipate heat inside the fixed frame 2. A sealing groove 37 is opened on the upper side of the fixed frame 2. A conductive rubber sealing ring 38 that can be inserted into the sealing groove 37 is fixedly connected to the bottom surface of the top plate 3.

[0022] Please see Figures 2-8 The heat dissipation component shown in the figure includes a fixed cylinder 17 fixedly installed on a fixed frame 13. A piston rod 18 is slidably connected in the horizontal direction inside the fixed cylinder 17. A push-pull frame 19 is fixedly connected to the end of the piston rod 18 away from the fixed cylinder 17. Two sets of rotating rods 20 are rotatably connected to the push-pull frame 19. The two sets of rotating rods 20 are rotatably connected to the sides of the upper and lower lifting frames 14 respectively. The two lifting frames 14 are located on the upper and lower sides of the push-pull frame 19 respectively. The fixed frame 13 is provided with a control component 21 for controlling the lifting of the top plate 3 and simultaneously adjusting the piston rod 18. The control component 21 includes a hydraulic control pump 22 fixedly installed on the fixed frame 13. A hydraulic cylinder 23 is fixedly connected to the fixed frame 13. A hydraulic rod 24 is slidably connected to the inner wall of the hydraulic cylinder 23. The bottom end of the hydraulic rod 24 is fixedly connected to the top surface of the top plate 3. A connecting pipe 25 is connected to the hydraulic cylinder 23 and connected to one end of the fixed cylinder 17. The output end of the hydraulic control pump 22 is connected to the middle part of the connecting pipe 25.

[0023] Please see Figures 1-6 The bottom plate 1 in the figure is fixedly connected to a guide frame 31. A sliding block 32 is slidably connected in the horizontal direction inside the guide frame 31. A wire 33 is provided on the sliding block 32. The side of the sliding block 32 near the constant voltage source 4 of U2 can contact the constant voltage source 4 of U2 and charge the constant voltage source 4 of U2. The bottom of the plug plate 28 near the sliding block 32 is provided with a slope 34. The upper side of the end of the sliding block 32 near the constant voltage source 4 of U2 is designed with a slope. The slope 34 can slide in contact with the slope of the sliding block 32. The end of the sliding block 32 away from the constant voltage source 4 of U2 is fixedly connected to an elastic element 35 fixedly connected to the guide frame 31. The elastic element 35 can be replaced by any existing elastic structure such as a spring.

[0024] Please see Figures 1-10 The present invention provides a detection method for a mechanical contact state detection device, comprising the following steps: S1. The voltage across the standard precision resistor R1 resistor 5 is measured by the V1 voltage acquisition module 8, and the actual output voltage of the U2 constant voltage source 4 is tracked in real time by the V2 voltage acquisition module 9. S2. Through formula The resistance value of resistor 7 in the R3 loop is calculated to eliminate the error caused by power supply fluctuations; S3. By controlling the lifting and lowering adjustment device of the top plate 3 to adjust the overall opening and closing state, and by providing metal shielding when closed to reduce external interference with the test results, the top plate 3 is opened after the test is completed to output the internal test data, while improving heat dissipation efficiency.

[0025] Working principle: By controlling the hydraulic control pump 22 to adjust the hydraulic pressure in the connecting pipe 25, pressurizing the connecting pipe 25 pressurizes the fixed cylinder 17 and the hydraulic cylinder 23, thereby pushing the piston rod 18 and the hydraulic rod 24 to slide out. The piston rod 18 pushes the push-pull frame 19, causing the rotating rod 20 to open to the upper and lower sides, allowing the two sets of lifting frames 14 to reach the upper and lower ends of the fixed frame 13 respectively. At the same time, the hydraulic rod 24 drives the top plate 3 to move down, and the plug plate 28 slides down into the opening 16 under the guidance of the guide rod 29. The guide groove 27 and the guide rod 29 are twisted and fit together, which can improve the sealing of the connection. In addition, it is combined with the internal setting The lifting frame 30 adopts a fully enclosed structure, and the bottom of the lifting frame 30 can be inserted into the groove at the edge of the base plate 1. The bottom of the lifting frame 30 is also equipped with a conductive rubber sealing ring 38, so that the base plate 1, the fixed frame 2, the top plate 3 and the lifting frame 30 together form a basically closed metal box structure, which further improves the metal shielding effect. At this time, the air outlet of the cooling fan 15 is directly facing the heat dissipation fins 12 on the base plate 1 and the top plate 3, and the airflow direction is consistent with the direction of the heat dissipation fins 12. It can conduct the heat generated by the components in the metal box during operation to the heat dissipation fins 12 and accelerate the heat dissipation through airflow, so as to avoid the temperature inside the metal box being too high and affecting the accuracy of the detection.

[0026] As the plug-in plate 28 moves downward, the slope 34 slides against the inclined surface of the sliding block 32, pushing the sliding block 32 away from the constant pressure source 4 of U2. This gradually releases the charging state of the sliding block 32 to the constant pressure source 4 of U2. After the plug-in plate 28 is fully inserted into the opening 16, the sliding block 32 is blocked outside the metal box, and the elastic element 35 is compressed. After the test is completed, the hydraulic control pump 22 draws in, reducing the pressure in the connecting pipe 25, the fixed cylinder 17, and the hydraulic cylinder 23. The top plate 3 is lifted, causing the plug-in plate 28 and the lifting frame 30 to move upward together, thereby opening the position of the opening 16. The signal from the controller 10 can be transmitted to the outside. At the same time, the piston rod 18 is pulled back, causing the push-pull frame 19 to pull the rotating rods 20 on both sides, so that the upper and lower lifting frames 14 slide towards the middle synchronously. The cooling fan 15 gradually slides to the position of the opening 16. At this time, the cooling fan 15 blows air directly onto the opening 16, which can directly remove the heat inside the metal box and improve the heat dissipation efficiency. At this time, the heat dissipation efficiency of the heat dissipation fins 12 is far less than that of direct air blowing. Therefore, it is necessary to adjust the position of the cooling fan 15 at the same time. During the opening of the side opening 16, the elastic element 35 rebounds, which can push the sliding block 32 and drive the wire 33 to slide together towards the side of the U2 constant voltage source 4. The charging end of the sliding block 32 makes contact with the side of the U2 constant voltage source 4 to complete the charging operation of the U2 constant voltage source 4. This device can significantly reduce the number of wires set around the fixed frame 2 and reduce the interference of external factors. The controller 10 and the U2 constant voltage source 4 are powered by charging and transmit signals through wireless devices, reducing the number of wires passing through the fixed frame 2, improving the overall shielding effect of the metal box, and improving the accuracy of the test results.

[0027] See Figures 9-10 Because the current is the same in a series circuit:

[0028] Meanwhile, the voltage V1 across R1 is:

[0029] From the above formula, we can obtain:

[0030]

[0031]

[0032] 1. Avoid errors and costs in current measurement. The drawbacks of the voltmeter-ammeter method: To accurately measure the current flowing through R3, a precision sampling resistor is usually required in series (or a current clamp / current sensor is used), which introduces additional temperature drift, noise, amplifier offset, and range switching issues. High-precision current measurement (especially of small currents) is more expensive and complex than voltage measurement.

[0033] The advantage of this method is that it does not require direct current measurement. The current is indirectly calculated using the voltage V1 across R1 and the known value of R1 (I=V1 / R1), relying only on voltage measurement and a known precision resistor. Modern ADCs can easily achieve high accuracy in voltage measurement, and precision resistors (e.g., 0.01% temperature drift 5ppm) are cheaper than current sensors of the same accuracy.

[0034] 2. Eliminate the influence of constant pressure source fluctuations (through proportional measurement) Problem with the voltmeter-ammeter method: If a constant voltage source is used to directly measure the current of R3, an ammeter or sampling resistor needs to be connected in series. However, voltage fluctuations of the constant voltage source (such as power supply ripple, temperature drift, and voltage drop of the conductor) will directly cause changes in current, thus introducing errors.

[0035] Advantages of this method: Formula Although U2 appears in the molecule, if U2 is simultaneously measured in real time using V2, this ratio can be calculated. Since V1 and U2 are from the same source (series circuit), their proportional changes with power supply fluctuations are almost synchronous, and the accuracy of the ratio is much higher than that of absolute voltage. This is called ratio measurement in engineering, which can significantly suppress common-mode errors of the power supply and ADC reference.

[0036] 3. It facilitates insertion of a test device into an existing power supply circuit (without requiring an additional ammeter in series). Real-world scenario: Many activation circuits (such as automotive wiring harnesses, airbag circuits, and contactor coil circuits) are already powered by a constant voltage source. If the voltmeter-ammeter method is used to measure R3, the circuit needs to be disconnected and the ammeter connected in series, which changes the circuit topology and may affect the activation state.

[0037] Advantages of this method: It only requires a V1 voltage acquisition module (high input impedance, almost no current draw) to be connected in parallel with R1, without disrupting the original circuit operation. R1 and R2 can be pre-designed to be permanently connected in series in the circuit, and V1 is only read by the ADC during the detection period, without affecting the circuit function at other times.

[0038] 4. When measuring small resistances, avoid interference from contact resistance / lead resistance (four-wire method equivalent). The drawback of the voltmeter-ammeter method: If R3 is very small (e.g., tens of milliohms to a few ohms), when measuring voltage and current using a two-wire system, the contact resistance of the test leads and the resistance of the conductive wires may be comparable to the resistance being measured, causing a huge error. If a four-wire Kelvin connection is used, two additional induction wires are required.

[0039] Advantages of this method: It effectively creates an implicit four-line measurement. Current path: U2->R2->R3->Ground (the resistance of the conductive wire will be added to the measured value of R3, but if the voltage of R1 is sampled from its two ends (four-wire connection), the current sampling is not affected by the lead resistance).

[0040] More precisely: as long as V1 measures directly across R1 (instead of taking the value from the constant voltage source reference point), the voltage across R1 is unaffected by the resistance of the conductive wire between R1 and U2. Similarly, if U2 is measured directly at the power supply output using V2, the voltage drop across the power supply leads is eliminated. Thus, the calculation of R3 depends only on the known ratio of resistances R1 and R2 to the voltage, automatically canceling out most of the lead resistance.

[0041] 5. Real-time, uninterrupted measurement capability For applications requiring continuous monitoring of circuit resistance (such as airbag circuits or solenoid valve circuits in explosive environments), the voltmeter-ammeter method necessitates interrupting normal operation to switch measurements. This method allows for online real-time reading of V1 and instantaneous calculation of R3 even when the circuit is active (current changes), provided that U2 is known or V2 is measured synchronously.

[0042] In terms of data processing, 50 sets of calculation results are continuously collected within a single detection cycle. The 10 largest and 10 smallest sets are removed, and the arithmetic mean of the remaining 30 sets is taken as the effective contact resistance value. The contact state is determined by comparing it with the preset threshold. When the top plate 3 moves upward, the opening and closing port 16 is opened, and the result calculated by the controller 10 can be transmitted to the receiver for display through signal transmission devices such as Bluetooth, thus obtaining the detection result.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mechanical contact state detection device, characterized in that, include: A base plate (1) is fixedly connected to the outer edge of the base plate (1), and a top plate (3) is provided on the upper side of the fixed frame (2). Also includes: The testing mechanism includes a U2 constant voltage source (4), an R1 resistor (5), an R2 resistor (6), an R3 loop resistor (7), a V1 voltage acquisition module (8), and a V2 voltage acquisition module (9) fixedly installed on the base plate (1). The R1 resistor (5) and the R2 resistor (6) are both standard high-precision resistors. The voltage across the standard precision resistor R1 resistor (5) is measured by the V1 voltage acquisition module (8), and the actual output voltage of the U2 constant voltage source (4) is tracked in real time by the V2 voltage acquisition module (9). An auxiliary mechanism is installed on the top plate (3).

2. The mechanical contact state detection device according to claim 1, characterized in that: The detection mechanism also includes a controller (10) fixedly installed above the base plate (1). The controller (10) is used to collect data from the U2 constant voltage source (4), the R1 resistor (5), the R2 resistor (6), the V1 voltage acquisition module (8), and the V2 voltage acquisition module (9) and calculate the value of the R3 loop resistor (7). The outer wall of the fixed frame (2) is fixedly connected with two sets of terminals (11) that can be connected to the R3 loop resistor (7) to form a loop.

3. The mechanical contact state detection device according to claim 1, characterized in that: The auxiliary mechanism also includes heat dissipation fins (12) fixedly installed below the base plate (1) and above the top plate (3). A fixed frame (13) is fixedly connected to the base plate (1). Two sets of lifting frames (14) are slidably connected to the fixed frame (13) in the vertical direction. A heat dissipation fan (15) is fixedly connected to each of the lifting frames (14). Multiple openings (16) are opened on the fixed frame (2). A heat dissipation component is provided on the fixed frame (13). When the openings (16) are closed, the heat dissipation component can control the heat dissipation fan (15) to move to the position of the heat dissipation fins (12) for heat dissipation. When the openings (16) are opened, the heat dissipation fan (15) is linked to move to the position of the openings (16) to dissipate heat inside the fixed frame (2).

4. The mechanical contact state detection device according to claim 3, characterized in that: The heat dissipation component includes a fixed cylinder (17) fixedly installed on the fixed frame (13). A piston rod (18) is slidably connected in the fixed cylinder (17) along the horizontal direction. A push-pull frame (19) is fixedly connected to one end of the piston rod (18) away from the fixed cylinder (17). Two sets of rotating rods (20) are rotatably connected to the push-pull frame (19). The two sets of rotating rods (20) are rotatably connected to the sides of the upper and lower lifting frames (14) respectively. The two lifting frames (14) are located on the upper and lower sides of the push-pull frame (19) respectively. The fixed frame (13) is provided with a control component (21) for controlling the lifting of the top plate (3) and simultaneously linking the piston rod (18) for sliding adjustment.

5. The mechanical contact state detection device according to claim 4, characterized in that: The control component (21) includes a hydraulic control pump (22) fixedly installed on the fixed frame (13). A hydraulic cylinder (23) is fixedly connected to the fixed frame (13). A hydraulic rod (24) is slidably connected to the inner wall of the hydraulic cylinder (23). The bottom end of the hydraulic rod (24) is fixedly connected to the top surface of the top plate (3). A connecting pipe (25) is connected to one end of the fixed cylinder (17) and the output end of the hydraulic control pump (22) is connected to the middle part of the connecting pipe (25).

6. The mechanical contact state detection device according to claim 3, characterized in that: Guide grooves (27) are provided on both sides of the opening (16). A plug plate (28) that can be inserted into the opening (16) in the vertical direction is fixedly connected to the bottom of the top plate (3). Guide rods (29) that are slidably connected to the inner wall of the guide groove (27) are fixedly connected to both sides of the plug plate (28). A lifting frame (30) that is slidably connected to the inner wall of the fixed frame (2) in the vertical direction is fixedly connected to the bottom surface of the top plate (3).

7. The mechanical contact state detection device according to claim 6, characterized in that: A guide frame (31) is fixedly connected to the side of the base plate (1). A sliding block (32) is slidably connected in the horizontal direction inside the guide frame (31). A wire (33) is provided on the sliding block (32). The side of the sliding block (32) close to the U2 constant voltage source (4) can contact the U2 constant voltage source (4) and charge the U2 constant voltage source (4). The bottom of the plug plate (28) close to the sliding block (32) is provided with a slope (34). The upper side of the end of the sliding block (32) close to the U2 constant voltage source (4) is designed with a slope. The slope (34) can slide in contact with the slope of the sliding block (32). The end of the sliding block (32) away from the U2 constant voltage source (4) is fixedly connected to an elastic element (35) fixedly connected to the guide frame (31).

8. The mechanical contact state detection device according to claim 1, characterized in that: A grounding wire (36) is fixedly connected to the side of the base plate (1).

9. The mechanical contact state detection device according to claim 1, characterized in that: The upper side of the fixed frame (2) is provided with a sealing groove (37), and the bottom surface of the top plate (3) is fixedly connected with a conductive rubber sealing ring (38) that can be inserted into the sealing groove (37).

10. A detection method based on a mechanical contact state detection device according to any one of claims 1-9, characterized in that, Includes the following steps: S1. The voltage across the standard precision resistor R1 (5) is measured by the V1 voltage acquisition module (8), and the actual output voltage of the U2 constant voltage source (4) is tracked in real time by the V2 voltage acquisition module (9). S2. Through formula The resistance value of the R3 circuit resistor (7) is calculated to eliminate the error caused by power supply fluctuations; S3. By controlling the overall opening and closing state of the lifting and adjusting device of the top plate (3), and performing metal shielding when closed, the interference of the outside world on the test results is reduced. After the test is completed, the top plate (3) is opened to output the internal test data, while improving the heat dissipation efficiency.

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