Analog signal fault judgment stethoscope

Abstract

The utility model belongs to the technical field of data transmission detection, and discloses an analog signal fault judgment stethoscope which comprises a machine shell, a pair of needle type contacts are arranged on the front end face of the machine shell, a loudspeaker is arranged at the rear end of the machine shell, and the needle type contacts are used for collecting analog quantity signals of a detected channel; the signal processing module is arranged in the machine shell, one end of each needle type contact is electrically connected with a signal input interface of the signal processing module, and a signal input interface of the loudspeaker is electrically connected with a signal output interface of the signal processing module. And the signal processing module is used for modulating and amplifying the analog quantity signal of the tested channel acquired by the needle type contact. The device has the advantages of simplicity and convenience in detection operation, high detection efficiency, high fault judgment accuracy, small size, light weight, firmness, durability, convenience in carrying and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of data transmission detection, and in particular relates to a stethoscope for judging faults of analog signals. Background Art

[0002] The data transmission channel of the infrared axle temperature detection system of railway vehicles (hereinafter referred to as: channel), the working status of the channel is directly related to the effectiveness and accuracy of the train axle temperature detection data transmission, so the channel maintenance is very important.

[0003] At present, due to the lack of special tools, it is generally carried out by modifying headphones and one person takes turns to work. Because the headphone modification is inconvenient to operate, and the headphone plug and the wire are not in stable contact, it is easy to cause low volume, unclear sound, discontinuous sound, or noise and other interference factors. In addition, everyone's judgment and hearing are different, and repeated inspections are required, which increases the channel inspection operation time, low maintenance efficiency, and easy misjudgment. In serious cases, it can lead to hidden dangers that endanger railway driving safety. Utility Model Content

[0004] The utility model aims to provide a stethoscope for judging faults of analog signals, so as to solve the problems of low detection efficiency and low accuracy in the existing detection methods.

[0005] In order to achieve the above object, the utility model adopts the following technical solution: an analog signal fault judgment stethoscope, the stethoscope comprising:

[0006] A housing, wherein a pair of pin contacts are provided on the front end surface of the housing, and a speaker is provided on the rear end of the housing, wherein the pin contacts are used to collect analog signals of the measured channel;

[0007] The signal processing module is arranged inside the casing, one end of each pin contact is electrically connected to the signal input interface of the signal processing module, the signal input interface of the speaker is electrically connected to the signal output interface of the signal processing module, and the signal processing module is used to modulate and amplify the analog signal of the measured channel collected by the pin contact.

[0008] Preferably, the stethoscope further comprises: a DC power supply, which is arranged inside the housing and is used to provide working power for the signal processing module.

[0009] Preferably, the stethoscope further comprises: a switch, which is mounted on the outer wall of the housing, and both ends of the switch are connected in series to the power supply circuit between the DC power supply and the signal processing module, so as to switch on or off the power supply to the signal processing module.

[0010] Preferably, the stethoscope further comprises: an indicator light, which is mounted on the outer wall of the housing, and both ends of the indicator light are connected in series to the power supply circuit between the DC power supply and the signal processing module to indicate whether the signal processing module is powered on.

[0011] Preferably, the signal processing module comprises: an amplifier, a first resistor, a second resistor, a potentiometer, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor;

[0012] The third pin of the amplifier is electrically connected to the first pin of the potentiometer, and the second pin and the third pin of the potentiometer are electrically connected to one end of two pin contacts respectively;

[0013] The first pin of the amplifier is electrically connected to the first pin of the first resistor, the second pin of the first resistor is electrically connected to the positive electrode of the first capacitor, and the negative electrode of the first capacitor is electrically connected to the eighth pin of the amplifier;

[0014] The sixth pin of the amplifier is a power input terminal, and the seventh pin of the amplifier is electrically connected to the first pin of the fourth capacitor;

[0015] The fifth pin of the amplifier is electrically connected to the positive electrode of the second capacitor and the first pin of the third capacitor respectively, the second pin of the third capacitor is electrically connected to the first pin of the second resistor, and the negative electrode of the second capacitor is electrically connected to the signal input terminal of the speaker;

[0016] The second pin and the fourth pin of the amplifier, the second pin of the potentiometer, the second pin of the second resistor and the second pin of the fourth capacitor are all grounded.

[0017] Preferably, the model of the amplifier is LM386.

[0018] Preferably, the first capacitor and the second capacitor are both polarized capacitors.

[0019] Preferably, the casing is a columnar structure.

[0020] Preferably, the pin contact is made of galvanized material.

[0021] Beneficial effects:

[0022] 1. The stethoscope of the utility model is handheld, small in size, light in weight, durable, and easy to carry. It does not have lead wires like headphones, and the wires will not be damaged by external forces during carrying;

[0023] 2. When testing, the stethoscope of the utility model can start collecting analog signals by directly contacting the two needle contacts with the channel. The testing operation is simple and convenient, and the testing efficiency is high. Secondly, the stethoscope has a speaker, so the volume is loud and the sound quality is good during testing. On-site maintenance personnel can jointly diagnose and judge, which greatly improves the accuracy of fault judgment and avoids the shortcomings of a single person taking turns wearing headphones to diagnose faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0025] Figure 1 It is a structural decomposition diagram of an analog signal fault judgment stethoscope provided by one embodiment of the utility model;

[0026] Figure 2 It is a circuit schematic diagram of a signal processing module of a stethoscope for judging analog signal faults provided by one embodiment of the utility model;

[0027] Figure 3 The utility model is a schematic diagram of the overall appearance of a stethoscope for judging a simulation signal fault provided by an embodiment of the utility model.

[0028] Description of reference numerals:

[0029] 1. Casing; 2. Pin contact; 3. Signal processing module; L. Speaker; BAT, DC power supply; K1, switch; H1, indicator light. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the utility model will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation of the utility model.

[0031] In the prior art, a lead wire is connected to the plug of the earphone, and then the end of the earphone plug and the lead wire can contact the two wiring terminals of any channel of the infrared axle temperature detection system of the railway vehicle to perform the test operation. In actual operation, this method is inconvenient to operate, hand shaking and other reasons make the wire contact unstable, resulting in a short circuit of the line and causing equipment failure. Secondly, since the cable used for channel transmission has no shielding layer, it is easy to generate interference signals such as noise due to current or other factors, and the sound is messy and harsh. When wearing headphones, sound waves directly act on the eardrum. Long-term use will cause irreversible damage to the inner ear hair cells and auditory nerves, affecting hearing and causing high-frequency hearing loss, tinnitus and other symptoms.

[0032] In order to solve the above problems existing in the prior art, this embodiment provides an analog signal fault judgment stethoscope. Figure 1 Schematic diagram of the structure of the analog signal fault judgment stethoscope provided by one embodiment of the utility model. Figure 1 As shown, the stethoscope comprises: a housing 1, a signal processing module 3, a pair of needle contacts 2 and a speaker L;

[0033] In this embodiment, the housing 1 is a columnar structure. Figure 3 As shown, a pair of pin contacts 2 are both arranged on the front end surface of the housing 1, and a speaker L is arranged on the rear end of the housing 1, and the pin contacts 2 are used to collect analog signals of the measured channel;

[0034] The signal processing module 3 is arranged inside the housing 1, one end of each pin contact 2 is electrically connected to the signal input interface of the signal processing module 3, the signal input interface of the speaker L is electrically connected to the signal output interface of the signal processing module 3, and the signal processing module 3 is used to modulate and amplify the analog signal of the measured channel collected by the pin contact 2.

[0035] When the analog signal fault judgment stethoscope of this embodiment is used for detection, the user holds the housing 1, and after the two needle contacts 2 on the front surface of the housing 1 are respectively contacted with the two wiring terminals of the channel to be tested (i.e., the data transmission channel of the infrared axle temperature detection system of railway vehicles), the analog signal can be collected, and the detection operation is simple and convenient; the collected analog signal is modulated and amplified by the signal processing module 3, and the analog signal after modulation and amplification is converted into an audio signal output by the speaker L, and the detection personnel judge whether there is a fault in the tested channel by judging the audio signal. Under normal conditions, a sound similar to a frog call can be heard, two signals with different amplitudes can be judged, and the category of the noise size can also be heard.

[0036] Since the stethoscope of this embodiment has a speaker L, the volume is loud and the sound quality is good during detection, and on-site maintenance personnel can jointly diagnose and judge, which greatly improves the accuracy of fault diagnosis and avoids the shortcomings of a single person taking turns wearing headphones to diagnose faults.

[0037] In this embodiment, the stethoscope has a short fault detection time and a high speed, which avoids a series of tedious modifications to the earphones in the early stage of detection. The detection time of a single device is shortened from about 30 minutes to about 5 minutes, truly achieving "test in seconds".

[0038] In this embodiment, since the cable used for transmission of the measured channel has no shielding layer, it is easy to generate interference signals such as noise due to current or other factors, and the sound is messy and harsh. When wearing headphones, sound waves directly act on the eardrum. Long-term use will cause irreversible damage to the inner ear hair cells and auditory nerves, affecting hearing and causing high-frequency hearing loss, tinnitus and other symptoms. The stethoscope of this embodiment has an external speaker function, which effectively avoids the above problems.

[0039] In this embodiment, the stethoscope is a digital analog signal to audio signal modulation and amplification device, which can not only be used for infrared equipment maintenance, but also for detection of professional equipment channels such as communications and signals. It has the advantages of wide application and strong practicality.

[0040] As a further optimization of this embodiment, the stethoscope further includes: a DC power supply BAT, a switch K1 and an indicator light H1;

[0041] The DC power supply BAT is arranged inside the housing 1 and is used to provide working power for the signal processing module 3 .

[0042] The switch K1 is mounted on the outer wall of the housing 1 , and both ends of the switch K1 are connected in series to the power supply circuit between the DC power supply BAT and the signal processing module 3 , so as to switch the signal processing module 3 on or off.

[0043] The indicator light H1 is mounted on the outer wall of the housing 1 , and both ends of the indicator light H1 are connected in series to the power supply circuit between the DC power supply BAT and the signal processing module 3 , so as to indicate whether the signal processing module 3 is powered on.

[0044] As a further optimization of this embodiment, Figure 2 As shown, the signal processing module 3 includes: an amplifier U1, a first resistor R1, a second resistor R2, a potentiometer R3, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4; wherein the amplifier U1 is of model LM386, and the first capacitor C1 and the second capacitor C2 are both polar capacitors.

[0045] Specifically, the third pin of the amplifier U1 is electrically connected to the first pin of the potentiometer R3, and the second pin and the third pin of the potentiometer R3 are electrically connected to one end of the two pin contacts 2 respectively;

[0046] The first pin of the amplifier U1 is electrically connected to the first pin of the first resistor R1, the second pin of the first resistor R1 is electrically connected to the positive electrode of the first capacitor C1, and the negative electrode of the first capacitor C1 is electrically connected to the eighth pin of the amplifier U1;

[0047] The sixth pin of the amplifier U1 is a power input terminal, and the seventh pin of the amplifier U1 is electrically connected to the first pin of the fourth capacitor C4;

[0048] The fifth pin of the amplifier U1 is electrically connected to the positive electrode of the second capacitor C2 and the first pin of the third capacitor C3 respectively, the second pin of the third capacitor C3 is electrically connected to the first pin of the second resistor R2, and the negative electrode of the second capacitor C2 is electrically connected to the signal input terminal of the speaker L;

[0049] The second pin and the fourth pin of the amplifier U1 , the second pin of the potentiometer R3 , the second pin of the second resistor R2 , and the second pin of the fourth capacitor C4 are all grounded.

[0050] exist Figure 2 In the embodiment, the positive electrode of the DC power supply BAT is electrically connected to the first end of the switch K1, the first end of the switch K1 is electrically connected to the sixth pin of the amplifier U1, the negative electrode of the DC power supply BAT is electrically connected to the first power end of the indicator light H1, and the second power end of the indicator light H1 is electrically connected to the second pin of the amplifier U1; when the switch K1 is closed, the amplifier U1 is powered on, and the indicator light H1 lights up; when the switch K1 is opened, the amplifier U1 is powered off, and the indicator light H1 is off.

[0051] The signal processing module 3 of this embodiment has good stability, durability and anti-interference ability.

[0052] As a further optimization of this embodiment, the pin contact 2 is made of galvanized material, so the pin contact 2 has low resistivity and good conductivity, ensuring the stable output of sound quality and volume; avoiding the problems of unstable sound output, low volume, poor sound quality, etc. caused by poor wire contact during previous modified headphone testing.

[0053] During the detection, the distance between the two pin contacts 2 is fixed, and the contact with the wiring terminal is stable and good; this avoids the previous problem of unstable wire contact and short circuit due to temporary modification of the headphone plug, inconvenient operation, hand shaking, etc. during the detection of a single person wearing headphones, which avoids equipment failure.

[0054] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An analog signal fault judgment stethoscope, characterized in that: The stethoscope comprises: A casing (1), wherein a pair of pin contacts (2) are provided on the front end surface of the casing (1), and a speaker (L) is provided on the rear end of the casing (1), wherein the pin contacts (2) are used to collect analog signals of a channel under test; A signal processing module (3) is arranged inside the housing (1); one end of each pin contact (2) is electrically connected to a signal input interface of the signal processing module (3); the signal input interface of the speaker (L) is electrically connected to a signal output interface of the signal processing module (3); and the signal processing module (3) is used to modulate and amplify the analog signal of the measured channel collected by the pin contact (2).

2. The analog signal fault judgment stethoscope according to claim 1, characterized in that: The stethoscope further comprises a direct current power supply (BAT), which is arranged inside the housing (1) and is used to provide working power for the signal processing module (3).

3. The analog signal fault judgment stethoscope according to claim 2, characterized in that: The stethoscope further comprises: a switch (K1), the switch (K1) being mounted on the outer wall of the housing (1), the two ends of the switch (K1) being connected in series to a power supply circuit between a DC power supply (BAT) and a signal processing module (3), and being used to switch the signal processing module (3) on or off.

4. The analog signal fault judgment stethoscope according to claim 2, characterized in that: The stethoscope further comprises: an indicator light (H1), the indicator light (H1) being mounted on the outer wall of the housing (1), the two ends of the indicator light (H1) being connected in series to a power supply circuit between a DC power supply (BAT) and a signal processing module (3), for indicating whether the signal processing module (3) is powered on.

5. The analog signal fault judgment stethoscope according to claim 1, characterized in that: The signal processing module (3) comprises: an amplifier, a first resistor, a second resistor, a potentiometer, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor; The third pin of the amplifier is electrically connected to the first pin of the potentiometer, and the second pin and the third pin of the potentiometer are electrically connected to one end of two pin contacts (2) respectively; The first pin of the amplifier is electrically connected to the first pin of the first resistor, the second pin of the first resistor is electrically connected to the positive electrode of the first capacitor, and the negative electrode of the first capacitor is electrically connected to the eighth pin of the amplifier; The sixth pin of the amplifier is a power input terminal, and the seventh pin of the amplifier is electrically connected to the first pin of the fourth capacitor; The fifth pin of the amplifier is electrically connected to the positive electrode of the second capacitor and the first pin of the third capacitor respectively, the second pin of the third capacitor is electrically connected to the first pin of the second resistor, and the negative electrode of the second capacitor is electrically connected to the signal input terminal of the speaker (L); The second pin and the fourth pin of the amplifier, the second pin of the potentiometer, the second pin of the second resistor and the second pin of the fourth capacitor are all grounded.

6. The analog signal fault judgment stethoscope according to claim 5, characterized in that: The model of the amplifier is LM386.

7. The analog signal fault judgment stethoscope according to claim 5, characterized in that: The first capacitor and the second capacitor are both polarized capacitors.

8. The analog signal fault judgment stethoscope according to any one of claims 1 to 7, characterized in that: The casing (1) is in a columnar structure.

9. The analog signal fault judgment stethoscope according to any one of claims 1 to 7, characterized in that: The pin contact (2) is made of galvanized material.

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