A protection circuit for a metal chip signal

Abstract

The utility model relates to a protection circuit of metal chip signal ware relates to a signal ware sensor protection circuit, in order to solve the problem that the existing metal chip signal ware is easy to short circuit, leads to its poor safety and poor reliability. One signal terminal is connected with one end of one resistance, two signal terminals are connected with one end of two resistances and the negative pole of metal chip signal ware body simultaneously, three signal terminals are connected with the other end of two resistances, the other end of one resistance and the positive pole of metal chip signal ware body simultaneously. Advantageous effect is to improve the safety and reliability of metal chip signal ware.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of signal sensor protection circuit. BACKGROUND

[0002] Metal chip signaler is a kind of sensor for detecting metal wear particles in mechanical equipment, it plays an important role in industry and aviation field. This kind of sensor can monitor the wear state of equipment in real time, and signal is sent when the particles generated by wear cause the connection between the two electrodes, so as to prevent the occurrence of failure and accident. In addition, when failure occurs, the sampling wear particles can be directly charged and disassembled, and the metal chip signaler is cleaned and reinstalled.

[0003] However, the existing metal chip signaler usually contains two electrodes, which are externally led to two signal terminals, one of which is connected to the signal detection device, and the other is connected to the negative terminal of the power supply. In some products, this end is also the shell of the metal chip signaler. This circuit design is easy to short circuit when disassembled and checked under live conditions due to contact with metal outer wall or other conductive objects. Short circuit may cause damage to the metal chip signaler and even cause equipment failure. Therefore, it is urgent to improve the design of the metal chip signaler circuit to make it more safe and reliable. SUMMARY

[0004] The purpose of the present application is to solve the problem of short circuit of the existing metal chip signaler, which leads to poor safety and poor reliability. A protection circuit for metal chip signaler is proposed.

[0005] The protection circuit for metal chip signaler includes a first signal terminal, a second signal terminal, a third signal terminal, a first resistor and a second resistor.

[0006] The first signal terminal is connected to one end of the first resistor.

[0007] The second signal terminal is connected to one end of the second resistor and the negative electrode of the metal chip signaler body respectively.

[0008] The third signal terminal is connected to the other end of the second resistor, the other end of the first resistor and the positive electrode of the metal chip signaler body respectively.

[0009] Further, the protection circuit further includes a first sliding resistor;

[0010] The first sliding resistor is connected in parallel across the first resistor.

[0011] Further, the protection circuit further includes a second sliding resistor;

[0012] The second sliding resistor is connected in parallel across the second resistor.

[0013] Further, the resistance value of the first resistor is 1kΩ; and the resistance value of the second resistor is 2kΩ.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] The present application effectively avoids the short circuit damage of the metal chip signal indicator during disassembly and inspection, and even causes the problem of related equipment failure shutdown, thereby improving the safety and reliability of the metal chip signal indicator. At the same time, the improved metal chip signal indicator circuit provides two forms of switch signal and resistance value signal, both of which can be used for metal chip signal detection, and can be adapted to different types of external signal detection equipment. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The existing metal chip signal indicator circuit in the specific embodiment one is shown in the figure.

[0017] Figure 2 The protection circuit of the metal chip signal indicator in the specific embodiment one is shown in the figure.

[0018] Figure 3 The protection circuit of the metal chip signal indicator in the specific embodiment one is used for the circuit diagram of the switch signal detection equipment; wherein, a is the wiring diagram of the switch signal detection equipment 7; b is the equivalent circuit diagram when the metal chip is detected; c is the equivalent circuit diagram when the metal chip is not detected.

[0019] Figure 4 The protection circuit of the metal chip signal indicator in the specific embodiment one is used for the circuit diagram of the resistance value signal detection equipment; wherein, a is the wiring diagram of the resistance signal detection equipment 8; b is the equivalent circuit diagram when the metal chip is detected; c is the equivalent circuit diagram when the metal chip is not detected.

[0020] Figure 5 The protection circuit of the metal chip signal indicator in the specific embodiment two is shown in the figure.

[0021] Figure 6 The protection circuit of the metal chip signal indicator in the specific embodiment three is shown in the figure. DETAILED DESCRIPTION

[0022] Specific embodiment one, combination Figures 1 to 4 The protection circuit of the metal chip signal indicator in the specific embodiment one is shown in the figure.

[0023] The first signal terminal 1 is connected with one end of the first resistor 5.

[0024] The second signal terminal 2 is connected to one end of the second resistor 6 and the negative terminal of the metal chip signal device body 3, respectively.

[0025] The third signal terminal 4 is connected to the other end of the second resistor 6, the other end of the first resistor 5, and the positive terminal of the metal chip signal body 3.

[0026] In this embodiment, the existing metal chip signal circuit diagram is as follows: Figure 1 As shown, the positive terminal of the metal chip signaler body 3 is connected to signal terminal 1; the negative terminal of the metal chip signaler body 3 is connected to signal terminal 2. By adding two resistors (resistor 5 and resistor 6) and a signal terminal 4 to the existing metal chip signaler circuit, the original two signal terminals (signal terminal 1 and signal terminal 2) are changed to three signal terminals, forming a protection circuit for a metal chip signaler as described in this embodiment. The specific structure of the protection circuit for a metal chip signaler is as follows: Figure 2 As shown.

[0027] The improved protection circuit described in this embodiment can provide both switch signal detection and resistance value signal detection. Both forms have short-circuit protection functions. In switch signal detection mode, the circuit is designed as a normally closed mode. That is, when no metal shavings signal is detected, there is a high-level signal between signal terminal 4 (signal 3) and signal terminal 2 (signal 2), and when a metal shavings signal is detected, there is a low-level signal between signal terminal 4 (signal 3) and signal terminal 2 (signal 2). In resistance value signal detection mode, the presence of a metal shavings signal is determined by detecting the resistance between signal terminal 1 (signal 1) and signal terminal 2 (signal 2).

[0028] The two resistors are used to prevent short circuits between signal terminal 4 (signal 3) and signal terminal 2 (signal 2), and to prevent short circuits between signal terminal 1 (signal 1) and signal terminal 2 (signal 2), respectively.

[0029] In this embodiment, the metal shavings signal unit 3 serves as a metal shavings collection device; the protection circuit, when used for switch signal detection:

[0030] Signal terminals 1, 2, and 4 are used to transmit the switching signal detected by the metal chip detector to the positive and negative power supply terminals and the signal detection terminal of the switch signal detection device 7. The switch signal detection device 7 can be a switch signal detection module of a PLC.

[0031] Resistor 5 (number 1) and resistor 6 (number 2) are used to implement the safety protection function to prevent short circuits.

[0032] The protection circuit in the embodiment is designed as a normally closed mode, that is, when no metal chip signal is detected, the signal terminal 4 and the signal terminal 2 are in a high level signal (the high and low levels of the signal depend on the selection of the power supply voltage value and the resistance values of the first resistor 5 and the second resistor 6), and when the metal chip signal is detected, the signal terminal 4 and the signal terminal 2 are in a low level signal.

[0033] When the metal chip signal device is disassembled, if the upper end of the metal chip signal device body 3 touches a conductive object, the existence of the first resistor 5 prevents the occurrence of a short circuit. At this time, the signal terminal 4 and the signal terminal 2 are in a low level signal, indicating that the metal chip signal is detected.

[0034] When the metal chip signal device is disassembled, if the lower end of the metal chip signal device body 3 touches a conductive object, the signal terminal 2 itself is the negative terminal of the power supply. Such a touch has no effect on the metal chip signal device, as shown in detail in Figure 3 .

[0035] In the resistance value detection:

[0036] The signal terminal 1 and the signal terminal 2 are used to transmit the resistance value signal detected by the metal chip signal device to the resistance signal detection device 8 for measurement, and to determine whether the metal chip is detected.

[0037] The first resistor 5 and the second resistor 6 are used to realize the safety protection function of preventing short circuit in the present application.

[0038] When no metal chip signal is detected, the resistance value between the signal terminal 1 and the signal terminal 2 is the sum of the resistance values of the first resistor 5 and the second resistor 6.

[0039] When the metal chip signal is detected, the resistance value between the signal terminal 1 and the signal terminal 2 is the resistance value of the first resistor 5.

[0040] Therefore, by detecting the resistance value between the signal terminal 1 and the signal terminal 2, it can be determined whether the metal chip signal device body 3 detects the metal chip signal; as shown in detail in Figure 4 .

[0041] For example: when the power supply is DC 24V, the resistance value of the resistor 5 is 1kΩ, and the resistance value of the resistor 6 is 2kΩ, the voltage value between the signal terminals 4 and 2 is about 16V when it is in a high level.

[0042] Specific implementation method two, combined Figure 5 with the specific implementation method one, the present embodiment further limits the protection circuit of the metal chip signal device described in the specific implementation method one. In the present embodiment, the protection circuit further comprises a first sliding resistor 9;

[0043] The first slide rheostat 9 is connected in parallel between the two ends of the first resistor 5.

[0044] In the embodiment, by adding the first slide rheostat 9, when adjusting the slide of the first slide rheostat 9, the output signal voltage and the output resistance value can be adjusted to adapt to different types of external signal detection devices (the switch signal detection device 7 or the resistance signal detection device 8).

[0045] Specific embodiment three, combined Figure 6 In the embodiment, the protection circuit further comprises a second slide rheostat 10.

[0046] The second slide rheostat 10 is connected in parallel between the two ends of the second resistor 6.

[0047] In the embodiment, by adding the second slide rheostat 10, when adjusting the slide of the second slide rheostat 10, the output signal voltage and the output resistance value can be adjusted to adapt to different types of external signal detection devices (the switch signal detection device 7 or the resistance signal detection device 8).

[0048] Specific embodiment four, the protection circuit of the metal chip signal device is further limited in the embodiment of the specific embodiment one, in the embodiment, the resistance value of the first resistor 5 is 1kΩ; the resistance value of the second resistor 6 is 2kΩ.

[0049] In the embodiment, when the resistance value of the first resistor 5 is 1kΩ and the resistance value of the second resistor 6 is 2kΩ, when the metal chip or the upper part of the metal chip signal device body 3 contacts the conductive object is detected, the resistance value between the third signal terminal 4 and the second signal terminal 2 is the resistance value of the first resistor 5, that is, 1kΩ, when the metal chip or the lower part of the metal chip signal device body 3 contacts the conductive object is not detected, the resistance value between the third signal terminal 4 and the second signal terminal 2 is the sum of the resistance values of the first resistor 5 and the second resistor 6, that is, 3kΩ.

[0050] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A protection circuit for a metal chip signalizer, said protection circuit comprising a first signal terminal (1) and a second signal terminal (2); characterized in that, It also includes the third signal terminal (4), the first resistance (5) and the second resistance (6); The first signal terminal (1) is connected with one end of the first resistance (5); The second signal terminal (2) is connected with one end of the second resistance (6) and the negative pole of the metal scrap signal ware body (3) respectively; The third signal terminal (4) is connected with the other end of the second resistance (6), the other end of the first resistance (5) and the positive pole of the metal scrap signal ware body (3) respectively; The resistance value of the first resistance (5) is 1kΩ; the resistance value of the second resistance (6) is 2kΩ; The protection circuit further includes the first sliding rheostat (9) or the second sliding rheostat (10); The first sliding rheostat (9) is connected in parallel across the first resistance (5); The second sliding rheostat (10) is connected in parallel across the second resistance (6).

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