An operating system for a contactless proximity switch

Abstract

The present invention relates to an operating system of a non-contact proximity switch, comprising the following steps: Step S1: Set the triggering distance h; Step S2: Generate n electromagnetic field regions with different induction ranges through an EM mechanism; Step S3: A monitoring circuit monitors the change of the electromagnetic field and issues a corresponding output signal; Step S4: The processor operates; Step S5: The processing unit processes multiple output signals and obtains the signal x; Step S6: The processing unit calculates the target distance y; Step S7: The processing unit determines whether y ≤ h; Step S8: Output a control signal. By adopting the above technical solution, the magnetic field interference caused by environmental factors can be reduced, the situation that the switch cannot be operated can be avoided, and the repeated positioning accuracy is high, the anti-interference performance is good, and it is resistant to high temperature and waterproof. At the same time, the setting of multiple electronic components increases the induction distance, and it can be used in complex environments such as underwater, and can be applied to fields such as steel, transportation, mining, and military industry, expanding the use range of the switch.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to an operating system for a non-contact proximity switch. Background Art

[0002] A proximity switch is a position switch that can be operated without mechanical direct contact with a moving part. When an object approaches the sensing surface of the proximity switch to the operating distance, the switch can be actuated without mechanical contact and without applying any pressure, thereby driving a DC electrical appliance or providing a control instruction to a computer (PLC) device. A proximity switch is a type of switch sensor (i.e., a non-contact switch), which has the characteristics of a travel switch and a microswitch, and at the same time has sensing performance, and is reliable in action, stable in performance, fast in frequency response, long in service life, strong in anti-interference ability, etc., and has the characteristics of waterproof, shockproof, corrosion-resistant, etc. The products include inductive, capacitive, Hall type, AC and DC types.

[0003] A proximity switch, also known as a non-contact proximity switch, is an ideal electronic switch sensor. When a metal detection body approaches the sensing area of the proximity switch, the switch can issue an electrical instruction without contact, without pressure, without sparks, and quickly, accurately reflecting the position and stroke of the moving mechanism. Even when used for general travel control, its positioning accuracy, operating frequency, service life, convenience of installation and adjustment, and adaptability to harsh environments are incomparable to those of general mechanical travel switches. It is widely used in industries such as machine tools, metallurgy, chemical industry, light textile, and printing. It can be used as a limit, counting, positioning control, and automatic protection link in an automatic control system.

[0004] Since the principle of a proximity switch is to change the magnetic field intensity by adjusting the current on the coil, and to identify whether there is a metal object through the principle of eddy current effect. The currently common setting method is to change the resistance value on the control board, thereby changing the current flowing through the coil to set the distance. However, a proximity switch is easily interfered by environmental factors such as temperature or medium. When used in complex environments such as steel, transportation, mines, and military industries, the accuracy of the proximity switch is still an urgent problem to be solved. Summary of the Invention

[0005] In summary, in order to overcome the deficiencies of the prior art, the present invention provides an operating system for a non-contact proximity switch.

[0006] To achieve the above object, the present invention provides the following technical solutions: An operating system for a contactless proximity switch, comprising the following steps: Step S1: Set the trigger distance h; Step S2: Generate n electromagnetic field regions with different induction ranges through an EM mechanism; Step S3: A monitoring circuit monitors the change of the electromagnetic field and issues a corresponding output signal; Step S4: The processor operates; Step S5: The processing unit processes multiple output signals and obtains the signal x; Step S6: The processing unit calculates the target distance y; Step S7: The processing unit determines whether y ≤ h; Step S8: Output a control signal.

[0007] By adopting the above technical solutions, the EM mechanism generates an electromagnetic field, and the measured target is positioned near the electromagnetic field generated by the electronic component. When the change in the displacement of the target causes a change in the electromagnetic field perturbation, which in turn causes a change in the output signal of the monitoring circuit, the processing unit comprehensively determines based on the output signals of different electronic components, confirms the displacement change x of the target, obtains the target distance y. When y ≤ h, the control switch outputs a control signal. When y > h, the monitoring circuit continuously monitors. Ultimately, the interaction between the field and the target forms the sensing element, rather than being realized by reducing the resistance in the sensing circuit. Therefore, the solution of the present invention can reduce the magnetic field interference caused by environmental factors, avoid the switch from being inoperable, and has high repeat positioning accuracy, good anti-interference performance, and is resistant to high temperature and waterproof. At the same time, the setting of multiple electronic components increases the induction distance and can be used in complex environments such as underwater, and can be applied to fields such as steel, transportation, mining, and military, expanding the scope of use of the switch.

[0008] The present invention is further provided with: The electromagnetic field region includes m with different induction ranges 1 、m 2…… m n , and the output signal includes the detection target values x 1 、x 2…… x n corresponding to the electromagnetic field region, where the similar or identical target value obtained is x.

[0009] By adopting the above technical solutions, for example, m 1 、m 2、 m 3 are 10mm, 15mm, and 20mm respectively. When the signal x 1 is 12.5mm, and x 2、 x 3 are both 11.5mm, then x obtained is 11.5mm; m 1 、m 2、 m 3 are 20mm, 30mm, and 50mm respectively. When the signals x 1、 x 2 are both 18mm, and x 3If it is 19 mm, then x is obtained as 18 mm. From the above, it can be seen that according to the principle of electromagnetic disturbance, multiple-frequency electromagnetic electronic components are used to enhance the electromagnetic field at a distance farther from the sensor surface, forming electromagnetic field domains with multiple different induction ranges, thereby significantly increasing the induction distance. Thus, the accurate displacement distance of the object can be obtained based on the magnetic field changes of different frequencies, thereby improving the accuracy of the proximity switch.

[0010] The present invention further sets: The frequency adjustment component selects the corresponding operating frequency according to the field domain m where x is located x so that the temperature coefficient oscillator operates at this frequency. After receiving the output frequency of the temperature coefficient oscillator, the processing unit compares it with the temperature data stored in the storage unit corresponding to the output frequency to obtain the temperature value and calculate the temperature difference coefficient z.

[0011] By adopting the above technical solution, there is a specific relationship between the oscillation frequency of the temperature coefficient oscillator and the temperature, that is, different temperatures correspond to different oscillation frequencies. By measuring the output frequency of the oscillator, the temperature value can be measured; the temperature coefficient oscillator adopts the operating frequency corresponding to the field domain m where x is located x to ensure that, except for temperature, other interference conditions are unified, so as to obtain an accurate temperature value, and thus accurately obtain the temperature difference coefficient z; after receiving the output frequency of the temperature coefficient oscillator, the processing unit compares it with the temperature data stored in the storage unit corresponding to the output frequency to obtain the temperature value, and the storage data calculates the temperature difference coefficient z according to the temperature difference. The temperature coefficient z is obtained from the data stored in the storage unit, achieving precise calibration and reducing the influence of temperature on the Q value of the oscillation circuit, thereby ensuring the accuracy and detection distance of the switch.

[0012] The present invention further sets: In the step S6, the target distance y = xz.

[0013] By adopting the above technical solution, the target distance value is not directly obtained. Combining the detection value x obtained by multiple frequencies with the temperature difference coefficient not only ensures the induction range of this proximity switch but also expands the temperature range of use of this proximity switch, improving the accuracy. The induction distance of the technical solution of the present invention is 2-4 times that of the existing inductive proximity switch.

[0014] The present invention further sets: The temperature difference coefficient z = x z / x a , where x z is the detection target value at temperature z, and x a is the standard target value at normal temperature.

[0015] By adopting the above technical solution, the storage unit stores the data of the temperature difference coefficient z, and the z data is obtained from the detection data. At the same frequency, when the target is placed at a specified distance at normal temperature, that is, x a, the detected target value x obtained at different temperatures z , the temperature difference coefficient z = x z / x a , and this data is stored in the storage unit, enabling this proximity switch to maintain a high precision under extreme temperature conditions.

[0016] The present invention further sets: m 1 ≤m 2 ≤m b ≤m n , when h is greater than m b , then x is excluded when calculating x 1 ~x b .

[0017] By adopting the above technical solution, for example, m 1 , m 2、 m b、 m n are 20mm, 30mm, 50mm, 60mm respectively. When h is 52mm, the signal x is excluded when calculating x 1 ~x b， derived from x b+1 ~ x n to improve the precision of the response.

[0018] The present invention further sets: when h is greater than m n , then the control unit of the processor can simultaneously regulate the operating frequencies of different electronic components, so that the induction range m of the corresponding electromagnetic field regions increases.

[0019] By adopting the above technical solution, for example, when m 1 , m 2、 m n are 5mm, 10mm, 15mm respectively, and when h is 20mm, the control unit of the processor can simultaneously regulate the operating frequencies of different electronic components, so that the induction range m of the corresponding electromagnetic field regions increases. That is, by regulating the operating frequencies of different electronic components, m 1 , m 2、 m n can be regulated to 15mm, 30mm, 45mm and other situations respectively, so as to realize multiple frequency electromagnetic field regions with fewer electronic components and increase the induction range at the same time.

[0020] The present invention further sets: the n is 3 - 5.

[0021] By adopting the above technical solution, the induction range m of the corresponding electromagnetic field regions can be increased by regulating the operating frequencies of different electronic components, that is, the number of electronic components can be 3 - 5 groups.

[0022] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings and embodiments. Description of the Drawings

[0023] Figure 1 It is the circuit schematic diagram of the embodiment of the present invention;

[0024] Figure 2 It is the structural schematic diagram of the embodiment of the present invention;

[0025] Figure 3 It is the working flowchart of the embodiment of the present invention;

[0026] Figure 4 It is the parameter comparison table between the embodiment of the present invention and the existing inductive proximity switch;

[0027] Reference numerals: 1. EM mechanism, 11. Electronic component, 2. Processor, 3. Temperature coefficient oscillator, 4. Frequency adjustment component, 8. Power supply, 9. Target. Specific Embodiments

[0028] This specific embodiment is only an interpretation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions according to needs, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

[0029] See the attached Figures 1-4 , an operating system of a contactless proximity switch disclosed in this embodiment includes the following steps: Step S1: Set the trigger distance h; Step S2: Generate n electromagnetic field regions with different induction ranges through the EM mechanism 1; Step S3: The monitoring circuit monitors the change of the electromagnetic field and issues corresponding output signals; Step S4: The processor 2 operates; Step S5: The processing unit processes multiple output signals and obtains the signal x; Step S6: The processing unit calculates the distance y of the target 9; Step S7: The processing unit determines whether y ≤ h; Step S8: Output a control signal.

[0030] This embodiment is further provided that: the electromagnetic field regions include m with different induction ranges 1 , m 2…… m n , and the output signals include the detected target 9 values x corresponding to the electromagnetic field regions 1 , x 2…… x n , among which the similar or identical target 9 values obtained are x.

[0031] This embodiment is further provided that: the frequency adjustment component 4 is based on the field m where x is located xSelect the corresponding operating frequency so that the temperature coefficient oscillator 3 operates at this frequency. After receiving the output frequency of the temperature coefficient oscillator 3, the processing unit compares it with the temperature data stored in the storage unit corresponding to the output frequency to obtain the temperature value and calculate the temperature difference coefficient z.

[0032] In this embodiment, it is further set that in the step S6, the target 9 distance y = xz.

[0033] In this embodiment, it is further set that the temperature difference coefficient z = x z / x a where x z is the detected target 9 value at temperature z, and x a is the standard target 9 value at the normal temperature.

[0034] In this embodiment, it is further set that m 1 ≤ m 2 ≤ m b ≤ m n When h is greater than m b , then when calculating x, exclude x 1 ~x b .

[0035] In this embodiment, it is further set that when h is greater than m n , the control unit of the processor 2 can simultaneously adjust the operating frequencies of different electronic components 11 to increase the induction range m of the corresponding electromagnetic field regions.

[0036] In this embodiment, it is further set that the n is 3 - 5.

[0037] The above "between" not only refers to the between of azimuth and position, but also includes the meaning of the interaction between different parts. The above "upper and lower" are only relative descriptions for convenience of description and understanding, and do not exclude other possibilities.

[0038] Although terms such as EM mechanism 1, electronic component 11, processor 2, temperature coefficient oscillator 3, frequency adjustment component 4, power supply 8, target 9, etc. are used more in this article, the possibility of using other terms is not excluded. Using these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. An operating system for a non-contact proximity switch, characterized in that, it includes the following steps: Step S1: Set the trigger distance h; Step S2: Generate n electromagnetic field regions with different induction ranges through the EM mechanism; Step S3: The monitoring circuit monitors the electromagnetic field changes and issues corresponding output signals; Step S4: The processor operates; Step S5: The processing unit processes multiple output signals and obtains signal x; Step S6: The processing unit calculates the target distance y; Step S7: The processing unit determines whether y ≤ h; Step S8: Output a control signal; The frequency adjustment component selects a corresponding operating frequency according to the field m where x is located x so that the temperature coefficient oscillator operates at this frequency. After receiving the output frequency of the temperature coefficient oscillator, the processing unit compares it with the temperature data stored in the storage unit corresponding to the output frequency to obtain the temperature value and calculates the temperature difference coefficient z; in the step S6, the target distance y = xz.

2. The operating system for a non-contact proximity switch according to claim 1, characterized in that: The electromagnetic field region includes m with different induction ranges 1 、m 2…… m n The output signal includes the detection target values x corresponding to the electromagnetic field region 1 、x 2…… x n Among them, the similar or identical target value is x 3. The operating system for a non-contact proximity switch according to claim 1, characterized in that: The temperature difference coefficient z = x z / x a , x z is the detection target value at temperature z, and x a is the standard target value at the normal temperature.

4. The operating system for a non-contact proximity switch according to claim 2, characterized in that: m 1 ≤m 2 ≤m b ≤m n When h is greater than m b then, when calculating x, exclude x 1 ~x b .

5. The operating system for a non-contact proximity switch according to claim 4, characterized in that: When h is greater than m n the control unit of the processor can simultaneously adjust the operating frequencies of different electronic components, increasing the induction range m of the corresponding electromagnetic field regions.

6. The operating system for a non-contact proximity switch according to claim 4, characterized in that: wherein n is 3 to 5.

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