CN110793591A

CN110793591A - Signal adapter based on liquid level meter

Info

Publication number: CN110793591A
Application number: CN201810863306.8A
Authority: CN
Inventors: 叶青华; 张丽; 饶贵红
Original assignee: Shanghai Panda Machinery Group Co Ltd
Current assignee: Shanghai Panda Machinery Group Co Ltd
Priority date: 2018-08-01
Filing date: 2018-08-01
Publication date: 2020-02-14

Abstract

The invention discloses a signal adapter based on a liquid level meter, and particularly relates to a voltage conversion method of a digital signal. The signal adapter comprises an adapter shell and a circuit control part, wherein the adapter shell comprises an adapter shell body 100 and an adapter front cover 101; the upper and lower sides of the adapter housing 100 are symmetrically provided with lugs 102; the left side of the adapter housing 100 is left with a terminal row hole 104; the front cover indicator light hole 105 is positioned on the front cover of the shell; the circuit control part is mainly a PCB (printed Circuit Board) 108 which is arranged at the bottom of the adapter in parallel and is transmitted by digital logic signals, so that the structure is simple and the anti-interference performance is strong; the input signal can be converted into a digital signal for analysis, and signals such as unstable and abnormal signals are shielded, so that the method is stable and reliable; the liquid level meter has the advantages of comprehensive and humanized functions, no heat dissipation problem, small volume and easiness in fixing, can protect the use of the liquid level meter to the maximum extent, and prolongs the service life of the liquid level meter.

Description

Signal adapter based on liquid level meter

Technical Field

The invention relates to a signal adapter based on a liquid level meter, in particular to a voltage conversion method of a digital signal.

Background

Along with the continuous development of the domestic industrial industry, the types and the application fields of the liquid level meters are more and more extensive, in order to enable the liquid level meters to be better used by the majority of users and better prolong the service life of the liquid level meters, generally, the voltage higher than 36V is forbidden to be applied to the transmitter, otherwise, the transmitter can be damaged, the liquid level meters such as a float switch, a pressure switch and the like are easy to generate electric leakage phenomenon in the electrifying use process, are easy to be influenced by unstable voltage electromagnetic interference and the like to cause control errors and even generate dangers, in order to solve the problem, common enterprise units can use a switching power supply to be switched into safe low-voltage power supply, only the high voltage is switched into the low voltage to be safely supplied without other functions, the switching power supply has higher cost and integration level, so that the heat dissipation performance is poor and easy to deform, the stability is easy to be, some units omit the component for reducing the cost, which has great potential safety hazard, and the invention is designed for solving the problem.

Disclosure of Invention

The invention has disclosed the signal adapter of a level gauge, especially relate to a method for utilizing the logic number to judge high pressure and low pressure, the above-mentioned adapter mainly includes the control circuit board that is made up of outer body and inside of the adapter, input/output terminal and signal indication are exposed to the upper surface and side of body, the signal conversion is all realized by the circuit board, specifically, a signal adapter based on level gauge, a high-low pressure signal adapter based on digital signal, it includes adapter outer casing and circuit control part to make up, the outer casing of the adapter includes the adapter body 100, the front cover 101 of the adapter; the circuit control part comprises four modules of a power supply, signal acquisition, logic control and signal output. The power supply module mainly comprises a switching power supply 1, a fuse 2, a voltage regulator tube 3, a capacitor 4 and the like; the signal acquisition module is composed of a selection switch 10, a divider resistor 11 and a wiring terminal row 12; the logic control module consists of 4 logic gate ICs 9; the signal output module consists of a relay 5, a light emitting diode 6, a resistor 7 and a Darlington tube IC 8, and the high-low voltage signal adapter based on the digital signal is characterized in that a switching power supply converts an AC220V power supply into DC12V, and then the DC12V voltage is converted into DC5V through a voltage stabilizing tube. A fuse is added in front of the switching power supply to protect a power supply switch so as to prevent other components from being burnt out in short circuit; the high-low voltage signal adapter based on the digital signal is characterized in that a signal acquisition module is provided with a selection switch, three modes can be selected, namely a three-wire mode, a two-wire normally open mode and a two-wire normally closed mode, the selection of the modes is mainly dependent on the property of the liquid level meter connected with the adapter, the high-low voltage signal adapter based on the digital signal is characterized in that a voltage signal acquired directly is usually high-voltage AC220V, the high-voltage signal acquired by properly reducing the resistance ratio of two groups of voltage resistors is adjusted to adapt to a 5V low-voltage circuit, the high-low voltage signal adapter based on the digital signal is characterized in that the signal output is a digital logic signal so as to judge various states of components in use, the stability and reliability are realized; meanwhile, the LED is used as an indicator light of corresponding state, and is respectively provided with power supply indication, state indication, alarm indication, output indication and the like; the high-low voltage signal adapter based on the digital signal is characterized in that two relays are arranged to output signals for providing passive dry contact points. The high-low voltage signal adapter based on the digital signal is characterized in that a Darlington tube IC is arranged as a signal amplifier to provide drive for 7 light-emitting diodes and 2 relays, the high-low voltage signal adapter based on the digital signal is characterized in that round holes are respectively formed in the positions, corresponding to the light-emitting diodes on a PCB, of a front cover of the signal adapter, the light-emitting diodes are displayed in the front cover of the adapter through the round holes, characters corresponding to respective indication states are arranged on the edges of the round holes, a mode selection instruction 106 is designed at the position, corresponding to a mode selection switch 10, of the lower right corner of the front cover 101 of the adapter, the high-low voltage signal adapter based on the digital signal is characterized in that all components are integrated on the PCB and are arranged at the bottom in a cuboid shell, and a plug-in wiring terminal plug-in end is exposed on, be convenient for installation and change, foretell high low pressure signal adapter based on digital signal, its characterized in that the switch select to arrange in the edge that is close to shorter that side of circuit board, map to the position fluting of the same area of shell so that select the shelves with direct toggle switch outside the shell, foretell high low pressure signal adapter based on digital signal, its characterized in that adapter casing upper and lower both sides be equipped with the symmetry respectively and be the hangers of trapezoidal form, trompil respectively in the middle of the hangers for the adapter is fixed.

Drawings

Fig. 1 is a schematic diagram of an external perspective structure of a signal adapter according to the present invention, fig. 2 is a schematic diagram of a circuit of a signal adapter according to the present invention, fig. 3 is a wiring diagram of a circuit board of a signal adapter according to the present invention, fig. 4 is a diagram of an actual product of a signal adapter according to the present invention for testing, fig. 5 is a schematic diagram of effects of a signal adapter according to the present invention before and after use, fig. 6 is a diagram of test data of a signal adapter according to the present invention, and in the diagrams: 1. a switching power supply; 2. a fuse; 3. a voltage stabilizing tube; 4. a capacitor; 5. a relay; 6. a light emitting diode; 7. exclusion; 8. a Darlington tube IC; 9. a logic gate IC; 10. a selector switch; 11. a voltage dividing resistor; 12. a terminal block; 100. an adapter housing; 101. a housing front cover; 102. hanging a lug; 103. an adapter fixing hole; 104. terminal row holes; 105. a front cover indicator light hole; 106. A mode selection specification; 107. a front cover fixing hole; 108. PCB circuit board.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments, first, the present invention is described with reference to the accompanying drawings, and as shown in fig. 1 and fig. 4, an appearance three-dimensional structure schematic diagram of a signal adapter based on a liquid level meter and an object diagram for testing are shown, wherein an adapter housing 100 and an adapter front cover 101 form a complete signal adapter through an adapter fixing hole 107, lugs 102 are symmetrically distributed on the upper and lower sides of the adapter housing 100, and an adapter fixing hole 103 is arranged at the center of the lug 102 for fixing the adapter itself; the left side of the adapter housing 100 is left with a terminal row hole 104; bezel indicator light aperture 105 is located in the housing bezel in the position shown in fig. 1 and 4, with text on the side. Referring to fig. 1 and 3, a mode selection instruction 106 is designed at the lower right corner of the front cover 101 of the adaptor at a position corresponding to the mode selection switch 10, as shown in fig. 4, the PCB is arranged at the bottom of the adaptor in parallel and is fixed by matching the four corners of the PCB with the inner dimension of the adaptor shell, fig. 2 is a circuit schematic diagram of the signal adaptor, wherein the circuit schematic diagram comprises four modules of power supply, signal acquisition, logic control and signal output, fig. 3 is a circuit schematic diagram of the PCB converted from the circuit schematic diagram of fig. 2, and in combination with the circuit schematic diagram of fig. 3 and the object schematic diagram of fig. 4, the power supply module is mainly distributed with a switching power supply (1), a fuse (2), a voltage regulator tube (3), a; the signal acquisition module consists of a selection switch (10), a divider resistor (11) and a wiring terminal (12); the logic control module consists of 4 logic gate ICs (9); the signal output module is composed of a relay (5), a light emitting diode (6) exclusion (7) and a Darlington tube IC (8), fig. 5 is a comparison graph of the effect before and after the use of the signal adapter, taking the case that a control cabinet is connected with a two-wire system normally open liquid level floating ball as an example, the left side is a wiring schematic diagram of the unused signal adapter, the liquid level floating ball is directly connected with the control cabinet to supply AC220V high voltage, the use has potential safety hazard, if a switching power supply is configured in the control cabinet, the cost is high, the electromagnetic interference is easy to cause, the operation and the instability are easy, the right side of fig. 5 is a wiring schematic diagram after the signal adapter is used, AC220V high voltage supplies power to the signal adapter, the signal returns to a safe use voltage, the signal adapter can be connected with various liquid level meters of a three-wire system, a two-wire system normally open normally closed and the like and provides DC12V, the input power supply is AC220V, the connection on-off is used as the simulation test of the input signal, the input end 9 is a normally closed point, 10 is a common point, and 11 is a normally open point; energization is recorded as 1, non-energization is recorded as 0, and in the three-wire system mode: when the input signals are 0 at the same time, the disconnection alarm is normal; when the input signals are 1 at the same time, short circuit alarm is carried out, and the operation is normal; when the input signals are 0 and 1, the normally open is switched on, the normally closed is switched on, the normal output is normal; when the input signals are 1 and 0, the normally open and the normally closed are unchanged, the output is not performed, and the normal operation is performed; in the two-wire system normally open mode: the input signal is 0 and is not output; the input signal is 1, and the output is carried out; normal, no alarm; normal; in a two-wire normally closed mode: the input signal is 0 and is not output; the input signal is 1, and the output is carried out; normally, no alarm is given; normal; experimental data show that the signal acquisition output and conversion of the invention are transmitted by digital logic signals, the structure is simple, and the anti-interference performance is strong; compared with the adapter products on the market, the adapter not only can convert the voltage of AC220 into a safe low-voltage signal for power supply, but also has power supply and alarm indication, high-low level signal indication of liquid level, and faults of short circuit, open circuit and the like of the liquid level meter can be detected and alarm output, so that the functions are more complete and diversified; on the basis, the invention is provided with a mode switching function, is suitable for three choices of a three-wire system liquid level meter, a two-wire system normally open and normally closed and the like, and can support the pairing of various liquid level meters; as a logic signal transmission mode is adopted, the control circuit is simple and reliable, the integrated PCB is smaller than the traditional size, and the whole volume of the adapter is only one half of that of a common switching power supply; the liquid level meter has comprehensive functions, is visual and reliable, can protect the use of the liquid level meter to the maximum extent, and prolongs the service life of the liquid level meter; small volume, diversified functions, intuition, reliability, strong anti-interference performance, switching of various modes, low cost and the like, can be widely adapted to liquid level meters in various fields, has strong competitiveness, can be widely popularized and understood, while the specification has been described in terms of various embodiments, it is not intended that each embodiment comprises a separate embodiment, which has been set forth only for the sake of clarity, and it will be appreciated by those skilled in the art that the specification as a whole can be combined as appropriate to form additional embodiments, which can be understood by those skilled in the art, and that the series of details disclosed above are merely illustrative of possible embodiments of the invention, which are not intended to limit the scope of the invention, which is intended to include all equivalent embodiments or modifications within the scope of the invention without departing from the technical spirit of the invention.

Claims

1. A high-low voltage signal adapter based on digital signal, it includes adapter outer casing and circuit control part make up, the adapter outer casing includes the casing 100 of the adapter, the front cover 101 of the adapter; the circuit control part comprises four modules of a power supply, signal acquisition, logic control and signal output, wherein the power supply module mainly comprises a switching power supply 1, a fuse 2, a voltage-regulator tube 3, a capacitor 4 and the like; the signal acquisition module is composed of a selection switch 10, a divider resistor 11 and a wiring terminal row 12; the logic control module consists of 4 logic gate ICs 9; the signal output module consists of a relay 5, a light emitting diode 6, a resistor 7 and a Darlington tube IC 8.

2. The digital signal-based high-low voltage signal adapter as claimed in claim 1, wherein the switching power supply converts AC220V power into DC12V, converts DC12V voltage into DC5V through a voltage regulator tube, and fuses are added in front of the switching power supply to protect the power switch from being burned out of short circuit; and a capacitor is added behind the voltage stabilizing tube for filtering and resisting interference.

3. A high-low voltage signal adapter based on digital signals according to claim 2 is characterized in that the signal acquisition module is provided with a selection switch, three modes can be selected, namely a three-wire mode, a two-wire normally open mode and a two-wire normally closed mode, and the selection of the modes is mainly determined by the property of the component connected into the adapter.

4. The digital signal-based high-low voltage signal adapter as claimed in claim 3, wherein the voltage signal obtained by signal acquisition is usually higher, and the ratio of resistance values of the two groups of voltage resistors is adjusted to properly lower the acquired high voltage signal, so as to adapt to a 5V low voltage circuit.

5. A high-low voltage signal adapter based on digital signal as claimed in claim 1, wherein the signal output is digital logic signal, so as to determine various states of the components in use; meanwhile, the LED is used as an indicator light of corresponding state, and is respectively provided with power supply indication, state indication, alarm indication, output indication and the like; a resistor is arranged between the LED and the resistor.

6. A high-low voltage signal adapter based on digital signal as claimed in claim 5, wherein there are two relays for outputting passive dry contact signal, and a Darlington IC is provided as signal amplifier for driving 7 LEDs and 2 relays.

7. The digital signal based high and low voltage signal adapter as claimed in claim 7, wherein the front cover of the signal adapter is provided with round holes corresponding to the positions of the light emitting diodes on the PCB, so that the light emitting diodes are displayed in the top cover of the housing through the round holes, the sides of the round holes are provided with characters corresponding to respective indication states, and the mode selection instruction 106 is designed at the lower right corner of the front cover 101 of the adapter corresponding to the mode selection switch 10.

8. The digital signal based high-low voltage signal adapter as claimed in claim 1, wherein all components are integrated on the PCB and mounted at the bottom of the rectangular housing, and the plug terminals are exposed at the left side of the housing for easy installation and replacement.

9. A high-low voltage signal adapter based on digital signals as claimed in claim 1, wherein the switch selection is disposed on the side of the circuit board near the shorter side, and the slot is formed at the position mapped to the same area of the housing so as to directly shift the switch selection outside the housing.

10. The adapter for high and low voltage signals based on digital signals as claimed in claim 1, wherein the housing 100 and the front cover 101 of the adapter form a complete signal adapter through the adapter fixing holes 107, the upper and lower sides of the adapter housing 100 are symmetrically provided with the hanging lugs 102, and the central position of the hanging lug 102 is provided with the adapter fixing hole 103 for fixing the adapter itself.