Mining intelligent flame-proof display screen

Abstract

The utility model provides a mining intelligent flame-proof display screen, and belongs to the field of mine display screens. The problem that an existing mining display screen cannot meet the requirements of a modern mine for information display and communication is solved. According to the technical scheme, the device comprises a shell made of Q235A steel and an intrinsic safety power source, a circuit board is arranged in the shell, a driving board, a main board and an LCD backlight board are arranged on the circuit board, a first audio backlight control module is arranged on the driving board, the first audio backlight control module is electrically connected with an audio transformer isolation module, a backlight driving module and a second audio backlight control module, and the second audio backlight control module is electrically connected with the main board. The audio transformer isolation module is electrically connected with the audio driving module, the audio driving module is electrically connected with a loudspeaker and a first intrinsic safety power supply, the backlight driving module is electrically connected with an LCD backlight plate and a plurality of intrinsic safety power supplies, the LCD backlight plate is provided with a plurality of groups of LED lamps, each group of LED lamps independently supplies power, and the mainboard is provided with a power supply interface and a plurality of communication interfaces. The mine display screen is applied to mine display screens.

Description

Technical Field

[0001] The utility model provides an intelligent explosion-proof display screen for mines, belonging to the technical field of mine display screens. Background Art

[0002] With the development and progress of science and technology, the requirements for mine information interaction in mine operations have gradually increased. The traditional mine display screen has a single function and can no longer meet the needs of modern mines for information display and communication. In addition, the current civilian smart display screen has a fragile structure and does not have explosion-proof function, and cannot be directly applied to the complex environment of coal mines. Therefore, there is an urgent need for a mine display screen with intelligent and explosion-proof performance to meet the special needs of the mine environment. Utility Model Content

[0003] In order to solve the technical problem that underground information interaction is single and the intrinsically safe power supply cannot reliably supply power to equipment such as a high-power display screen backlight module, the utility model proposes an intelligent explosion-proof display screen that can reliably supply power to high-power equipment such as a display screen backlight module. The purpose is to improve the hardware structure of the mining display screen or the combined connection of the hardware modules and / or circuits so that the mining display screen can meet the needs of modern mines for information display and communication while having an explosion-proof function.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: an intelligent explosion-proof display screen for mining, comprising a shell made of Q235A steel and an intrinsically safe power supply, a circuit board is arranged in the shell, and a driving board, a main board and an LCD backlight board are arranged on the circuit board;

[0005] The driving board is provided with a first audio backlight control module, and the first audio backlight control module is electrically connected to an audio transformer isolation module, an optocoupler isolation module on the backlight driving module and a second audio backlight control module on the main board;

[0006] The audio transformer isolation module is electrically connected to the audio driving module;

[0007] The audio driving module is electrically connected to a speaker and a first intrinsically safe power supply;

[0008] The backlight driving module is electrically connected to an LCD backlight panel and a plurality of intrinsically safe power supplies; a plurality of groups of LED lights are arranged on the LCD backlight panel, and each group of LED lights is powered separately;

[0009] The mainboard is also provided with a power supply interface and several communication interfaces; the communication interface includes an LVDS interface, a network port, a USB interface and an HDMI interface; the LVDS interface is electrically connected to a display screen; the network port is electrically connected to a fiber optic network port board module, and the fiber optic network port board module is electrically connected to a second intrinsically safe power supply; the power supply interface is electrically connected to a third intrinsically safe power supply;

[0010] The audio driving module includes a first chip; pin 1 of the first chip is connected in parallel with pin 2 of the first chip and then electrically connected to pin 3 of the first optical coupler; pin 3 of the first chip is connected in series with capacitor C14 and then connected to one end of resistor R19 and pin 6 of the first audio transformer, the other end of resistor R19 is grounded, and pin 1 of the first audio transformer is electrically connected to port 8 of the audio backlight connector P1; pin 5 of the first chip is connected in parallel with the first audio power input interface, one end of resistor R26 and one end of resistor R28, pin 6 of the first chip is connected in parallel with the first audio power input interface, one end of resistor R27 and one end of resistor R29, the other end of resistor R26 is connected in parallel with the other end of resistor R27 and then connected to the power supply, the other end of resistor R28 is connected in parallel with the other end of resistor R29 and then grounded; pin 12 of the first chip is connected in series with capacitor C17 and then connected to pin 6 of the second audio transformer, pin 1 of the second audio transformer is electrically connected to port 7 of the audio backlight connector P1; pin 13 of the first chip is electrically connected to the first audio power input interface, one end of resistor R26 and one end of resistor R28, the other end of resistor R26 and the other end of resistor R27 are connected in parallel to the power supply, the other end of resistor R28 and the other end of resistor R29 are connected in parallel to the ground; pin 12 of the first chip is connected in series with capacitor C17 and then connected to pin 6 of the second audio transformer, pin 1 of the second audio transformer is electrically connected to port 7 of the audio backlight connector P1; pin 13 of the first chip is electrically connected to the first Pin 3 of the second optical coupler, pin 17 of the first chip is connected in series with capacitor C22 and then connected to pin 18 of the first chip and one end of inductor L5, the other end of inductor L5 is connected in series with one end of capacitor C29 and port 1 of the second interface of the speaker; pin 21 of the first chip is connected in series with capacitor C21 and then connected to pin 20 of the first chip and one end of inductor L4, the other end of inductor L4 is connected in series with one end of capacitor C28 and port 2 of the second interface of the speaker, the other end of capacitor C28 and the other end of capacitor C29 The first chip is connected in parallel and then grounded; the 22nd pin of the first chip is connected in series with the capacitor C20, and then connected to the 23rd pin of the first chip and one end of the inductor L3; the other end of the inductor L3 is connected in series with the 2nd port of the first interface of the speaker and one end of the capacitor C27; the 26th pin of the first chip is connected in series with the capacitor C19, and then connected to the 25th pin of the first chip and one end of the inductor L2; the other end of the inductor L2 is connected in series with the 1st port of the first interface of the speaker and one end of the capacitor C26; the other end of the capacitor C26 is connected in parallel with the other end of the capacitor C27 and then grounded;

[0011] Pin 1 of the first optical coupler is connected in series with a resistor R17 and then connected to the first power supply terminal, and pin 1 of the second optical coupler is connected in series with a resistor R15 and then connected to the first power supply terminal, and the first power supply terminal is also connected to port 1 of the audio backlight connector P1, the power interface U3, the output terminal of the control board enabling module, and the input terminal of the backlight driving module;

[0012] The backlight driving module includes a first backlight control module and a second backlight control module;

[0013] The input end of the first backlight control module is electrically connected to the first power supply end and the audio backlight connection socket P1, and the output end of the first backlight control module is electrically connected to the first circuit and the second circuit; the input end of the second backlight control module is electrically connected to the first power supply end and the audio backlight connection socket P1, and the output end of the second backlight control module is electrically connected to the third circuit and the fourth circuit; by controlling the first circuit, the second circuit, the third circuit and the fourth circuit, the LED light array is driven to light up the LCD display screen to meet the requirements of the power size of the intrinsically safe power supply.

[0014] Further, pin 7 of the first chip is connected in parallel to one end of a resistor R22 and one end of a capacitor C12, the other end of the resistor R22 is connected to a power supply, pin 9 of the first chip is connected in parallel to one end of a capacitor C13 and one end of a resistor R24, the other end of the capacitor C13 is connected in parallel to the other end of the capacitor C12 and then grounded; pin 10 of the first chip is connected in parallel to the other end of the resistor R24 ​​and one end of a resistor R25, the other end of the resistor R25 is connected in parallel to pin 14 of the first chip and then grounded; pin 11 of the first chip is connected in series to capacitor C16 and then grounded; pin 15 of the first chip is connected in parallel to pin 16 of the first chip, pin 27 of the first chip, pin 28 of the first chip and a power supply, a number of capacitors are connected in parallel between pin 28 of the first chip and pin 29 of the first chip; pin 19 of the first chip is connected in parallel to pin 24 of the first chip and then grounded.

[0015] Further, the 2nd pin of the first optical coupler is electrically connected to the collector of the transistor Q5, the base of the transistor Q5 is connected in series with the resistor R18 and then electrically connected to the 6th port of the audio backlight connector P1, the emitter of the transistor Q5 is grounded, and the 4th pin of the first optical coupler is connected in series with the resistor R21 and then connected to the 12V power supply;

[0016] Pin 2 of the second optocoupler is electrically connected to the collector of transistor Q4, the base of transistor Q4 is connected in series with resistor 16 and then electrically connected to port 5 of the audio backlight connector P1, the emitter of transistor Q5 is grounded, and pin 4 of the second optocoupler is connected in series with resistor R20 and then connected to a 12V power supply.

[0017] Furthermore, the control board enabling module is provided with a third optical coupler, and the third optical coupler is electrically connected to the second chip.

[0018] Further, pin 2 of the second chip is connected in parallel to one end of the resistor R1, one end of the capacitor C3, one end of the capacitor C2, one end of the capacitor C1 and one end of the diode D1; the other end of the resistor R1 is connected in parallel to port 1 of the second plug-in CH1 and pin 1 of the third optical coupler; pin 6 of the second chip is connected in parallel to port 2 of the second plug-in CH1 and pin 2 of the third optical coupler; pin 7 of the second chip is connected in parallel to one end of the resistor R2 and one end of the capacitor C4; pin 1 of the second chip is connected in parallel to the other end of the resistor R2 and one end of the capacitor C5; the other end of the resistor R2 is also connected in parallel to one end of the resistor R3; the other end of the resistor R3, the other end of the capacitor C5, the other end of the capacitor C4, the other end of the capacitor C3, the other end of the capacitor C2 and the other end of the capacitor C1 are connected in parallel and then grounded; pin 4 of the third optical coupler is connected in series with resistor R9 and then electrically connected to the first power supply end.

[0019] Further, the first backlight control module is provided with a fourth optical coupler and a fifth optical coupler, the 1st pin of the fourth optical coupler is connected in series with a resistor R30 and then electrically connected to the first power supply end, the 4th pin of the fourth optical coupler is connected in parallel with the 1st port of the LCD_EN plug-in and then connected to the drain of the transistor Q10 of the first circuit; the 3rd pin of the fourth optical coupler is connected in parallel with the 2nd port of the LCD_EN plug-in and one end of the resistor R42, the 1st pin of the fifth optical coupler is connected in series with a resistor R31 and then electrically connected to the 4th port of the audio backlight connector P1, and the 4th pin of the fifth optical coupler is connected in parallel with the other end of the resistor R42 and the output end DIM_1 of the first backlight control module;

[0020] The circuit structure of the second backlight control module is the same as that of the first backlight control module, and the output terminal DIM_2 of the second backlight control module is electrically connected to the input terminal of the fourth circuit.

[0021] Further, the first circuit includes a connector CN2, and port 1 of the connector CN2 is connected in parallel with a voltage input terminal and a diode D4, and the diode D4 is connected in series with a diode D5 and connected in parallel with one end of a resistor R34, one end of a resistor R35, one end of a resistor R32, and an emitter of a transistor Q6, and the other end of the resistor R34 is connected in parallel with a base of the transistor Q6 and a source of the transistor Q10, and a node between a gate of the transistor Q10 and a collector of the transistor Q6 is connected in parallel with the other end of the resistor R35 and a collector of the transistor Q8, and the base of the transistor Q8 is connected in parallel with the other end of the resistor R35, one end of a capacitor C30, and one end of a resistor R36, and the emitter of the transistor Q8 is electrically connected to one end of a resistor R40, and port 2 of the connector CN2, the other end of the capacitor C30, the other end of the resistor R36, and the other end of the resistor R40 are connected in parallel and then grounded.

[0022] Further, the second circuit includes a third chip, wherein the 2nd pin of the third chip is connected in parallel to one end of the capacitor C32, one end of the capacitor C34 and the ground line, the 3rd pin of the third chip is connected in parallel to one end of the capacitor C36, one end of the resistor R47 and one end of the resistor R43, the other end of the capacitor C36 and the other end of the resistor R47 are connected in parallel and then grounded, and the other end of the resistor R43 is electrically connected to the 4th pin of the fifth optical coupler; the 1st pin of the third chip is connected in parallel to one end of the diode D8 and one end of the inductor U15, the other end of the diode D8, the other end of the capacitor C34 and the other end of the capacitor C32 One end is connected in parallel with the 5th pin of the third chip and then electrically connected to the output end DIM_1 of the first backlight control module and one end of the resistor R50; the other end of the inductor U15 is connected in parallel with one end of the capacitor C38, one end of the capacitor C42, the cathode of the diode LED1 and the 2nd port of the connector U17; the 4th pin of the third chip, the other end of the resistor R50, the other end of the capacitor C38, the other end of the capacitor C42 and one end of the resistor R52 are connected in parallel and then connected to the 1st port of the connector U17; the other end of the resistor R52 is electrically connected to the anode of the diode LED1, and the other end of the capacitor C39 is grounded;

[0023] The circuit structure of the third circuit is the same as that of the first circuit, and the circuit structure of the fourth circuit is the same as that of the second circuit.

[0024] Furthermore, each group of LED lights is provided with a plurality of light strips, and each light strip is provided with a plurality of lamp beads.

[0025] Further, the model of the first chip is VA2213TSG28; the model of the second chip is HDR-IDC-2.54-2X5P; the model of the third chip is PT4115;

[0026] The first optocoupler, the second optocoupler, the third optocoupler and the fourth optocoupler are of the LTV217TP1B series; the first audio transformer and the second audio transformer are of the ED8 series.

[0027] The beneficial effects of the present invention compared with the prior art are as follows:

[0028] 1. The surface of the Q235A shell of the utility model is sprayed with plastic, and has good corrosion resistance and anti-static performance; the utility model can realize an intrinsically safe power supply through multi-channel shunt power supply, and the voltage control range is DC 3.3V-24V; the optical fiber network port board module adopts a low-power switch chip, which further improves the safety of the underground operation of the utility model;

[0029] 2. The mainboard of the utility model is provided with a variety of interfaces, adopts an Android high-performance core board, 8+128G memory configuration, and uses the ADN4624 chip to isolate the LVDS signal of the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The utility model is further described below in conjunction with the accompanying drawings:

[0031] Figure 1 It is the principle diagram of the utility model;

[0032] Figure 2 This is a schematic diagram of the circuit structure of the audio driver module of the utility model;

[0033] Figure 3 for Figure 2 A partial enlarged view of part A;

[0034] Figure 4 for Figure 2 A partial enlarged view of part B;

[0035] Figure 5 for Figure 2 Partial magnification Figure 1 ;

[0036] Figure 6 This is a schematic diagram of the circuit structure of the backlight drive film block of the utility model;

[0037] Figure 7 This is a schematic diagram of the circuit structure of the first backlight control module of the utility model;

[0038] Figure 8 It is a schematic diagram of the circuit structure of the second backlight control module of the utility model;

[0039] Fig. 9 It is a schematic diagram of the circuit structure of the first circuit of the utility model;

[0040] Fig.10 It is a circuit structure schematic diagram of the second circuit of the utility model;

[0041] Fig.11 is a schematic diagram of the circuit structure of the third circuit of the utility model;

[0042] Fig.12 It is a circuit structure diagram of the fourth circuit of the utility model. DETAILED DESCRIPTION

[0043] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0044] like Figures 1 to 12 As shown, the utility model provides an intelligent explosion-proof display screen for mining, including a shell made of Q235A steel and an intrinsically safe power supply, a circuit board is arranged in the shell, and a driving board, a main board and an LCD backlight board are arranged on the circuit board;

[0045] A first audio backlight control module is arranged on the driving board, and the first audio backlight control module is electrically connected to an audio transformer isolation module, an optocoupler isolation module on the backlight driving module and a second audio backlight control module on the main board; the audio transformer isolation module is electrically connected to the audio driving module; and the audio driving module is electrically connected to a speaker and a first intrinsically safe power supply.

[0046] The backlight drive module is electrically connected to the LCD backlight panel and a plurality of intrinsically safe power supplies; a plurality of groups of LED lights are arranged on the LCD backlight panel, each group of LED lights is arranged with a plurality of light bars, and each light bar is arranged with a plurality of lamp beads. In this embodiment, two groups of LED lights are arranged on the LCD backlight panel, each group of LED lights is arranged with five light bars, each light bar is arranged with four lamp beads, and each group of LED lights is powered separately. The voltage can be controlled within the range of DC3.3V-24V by multi-channel shunt power supply, so that it can be powered by an intrinsically safe power supply.

[0047] The main board is also provided with a power supply interface and several communication interfaces; the main board adopts an Android high-performance core board with an 8+128G memory configuration. The communication interfaces include an LVDS interface, a network port, a USB interface and an HDMI interface. The ADN4624 chip is used to isolate the LVDS signal of the display screen. An 18V power supply is used to power the mainboard, and then an 18V power supply is used to power the display screen to meet the power consumption requirements of the intrinsically safe power supply; the LVDS interface is electrically connected to the display screen; the network port is electrically connected to the optical fiber network port board module, and the optical fiber network port board module is electrically connected to the second intrinsically safe power supply; the power supply interface is electrically connected to the third intrinsically safe power supply; the optical fiber network port board adopts a low-power switch chip, and a soft start circuit is used to ensure that the intrinsically safe power supply can meet the requirements.

[0048] The audio driving module includes a first chip; pin 1 of the first chip is connected in parallel with pin 2 of the first chip and then electrically connected to pin 3 of the first optical coupler; pin 3 of the first chip is connected in series with capacitor C14 and then connected to one end of resistor R19 and pin 6 of the first audio transformer, the other end of resistor R19 is grounded, and pin 1 of the first audio transformer is electrically connected to port 8 of the audio backlight connector P1; pin 5 of the first chip is connected in parallel with the first audio power input interface, one end of resistor R26 and one end of resistor R28, pin 6 of the first chip is connected in parallel with the first audio power input interface, one end of resistor R27 and one end of resistor R29, the other end of resistor R26 is connected in parallel with the other end of resistor R27 and then connected to the power supply, The other end of the resistor R28 is connected in parallel with the other end of the resistor R29 and then grounded; the 12th pin of the first chip is connected in series with the capacitor C17 and then connected to the 6th pin of the second audio transformer, and the 1st pin of the second audio transformer is electrically connected to the 7th port of the audio backlight connector P1; the 13th pin of the first chip is electrically connected to the 3rd pin of the second optical coupler, the 17th pin of the first chip is connected in series with the capacitor C22 and then connected to the 18th pin of the first chip and one end of the inductor L5, and the other end of the inductor L5 is connected in parallel with one end of the capacitor C29 and the 1st port of the second interface of the speaker; the 21st pin of the first chip is connected in series with the capacitor C21 and then connected to the 20th pin of the first chip and one end of the inductor L4, and the other end of the inductor L4 is connected in parallel to one end of the capacitor C28 and port 2 of the second interface of the speaker, the other end of capacitor C28 and the other end of capacitor C29 are connected in parallel and then grounded; pin 22 of the first chip is connected in series with capacitor C20 and then connected to pin 23 of the first chip and one end of inductor L3, the other end of inductor L3 is connected in parallel to port 2 of the first interface of the speaker and one end of capacitor C27; pin 26 of the first chip is connected in series with capacitor C19 and then connected to pin 25 of the first chip and one end of inductor L2, the other end of inductor L2 is connected in parallel to port 1 of the first interface of the speaker and one end of capacitor C26, the other end of capacitor C26 and the other end of capacitor C27 are connected in parallel and then grounded; pin 7 of the first chip is connected in series with one end of resistor R22 and one end of capacitor C12, resistor R22 The other end of the first chip is connected to the power supply, the 9th pin of the first chip is connected in parallel with one end of the capacitor C13 and one end of the resistor R24, the other end of the capacitor C13 is connected in parallel with the other end of the capacitor C12 and then grounded; the 10th pin of the first chip is connected in parallel with the other end of the resistor R24 ​​and one end of the resistor R25, the other end of the resistor R25 is connected in parallel with the 14th pin of the first chip and then grounded; the 11th pin of the first chip is connected in series with the capacitor C16 and then grounded; the 15th pin of the first chip is connected in parallel with the 16th pin of the first chip, the 27th pin of the first chip, the 28th pin of the first chip and the power supply, and a number of capacitors are connected in parallel between the 28th pin of the first chip and the 29th pin of the first chip; the 19th pin of the first chip is connected in parallel with the 24th pin of the first chip and then grounded.

[0049] Pin 1 of the first optical coupler is connected in series with a resistor R17 and then connected to the first power supply terminal; pin 2 of the first optical coupler is electrically connected to the collector of the transistor Q5; the base of the transistor Q5 is connected in series with a resistor R18 and then electrically connected to port 6 of the audio backlight connector P1; the emitter of the transistor Q5 is grounded; and pin 4 of the first optical coupler is connected in series with a resistor R21 and then connected to a 12V power supply; pin 1 of the second optical coupler is connected in series with a resistor R15 and then connected to the first power supply terminal; the first power supply terminal is also connected to port 1 of the audio backlight connector P1, the power interface U3, the output end of the control board enabling module, and the input end of the backlight driving module; pin 2 of the second optical coupler is electrically connected to the collector of the transistor Q4; the base of the transistor Q4 is connected in series with a resistor 16 and then electrically connected to port 5 of the audio backlight connector P1; the emitter of the transistor Q5 is grounded; and pin 4 of the second optical coupler is connected in series with a resistor R20 and then connected to a 12V power supply.

[0050] The control board enabling module is provided with a third optical coupler, and the third optical coupler is electrically connected to the second chip. Pin 2 of the second chip is connected to one end of the resistor R1, one end of the capacitor C3, one end of the capacitor C2, one end of the capacitor C1 and one end of the diode D1, the other end of the resistor R1 is connected to port 1 of the second plug-in CH1 and pin 1 of the third optical coupler, pin 6 of the second chip is connected to port 2 of the second plug-in CH1 and pin 2 of the third optical coupler, pin 7 of the second chip is connected to one end of the resistor R2 and one end of the capacitor C4, pin 1 of the second chip is connected to the other end of the resistor R2 and one end of the capacitor C5, the other end of the resistor R2 is also connected to one end of the resistor R3, the other end of the resistor R3, the other end of the capacitor C5, the other end of the capacitor C4, the other end of the capacitor C3, the other end of the capacitor C2 and the other end of the capacitor C1 are connected in parallel and then grounded; pin 4 of the third optical coupler is connected in series with resistor R9 and then electrically connected to the first power supply end.

[0051] The backlight driving module includes a first backlight control module and a second backlight control module. The input end of the first backlight control module is electrically connected to the first power supply end and the audio backlight connection socket P1, and the output end of the first backlight control module is electrically connected to the first circuit and the second circuit; the input end of the second backlight control module is electrically connected to the first power supply end and the audio backlight connection socket P1, and the output end of the second backlight control module is electrically connected to the third circuit and the fourth circuit; by controlling the first circuit, the second circuit, the third circuit and the fourth circuit, the LED lamp array is driven to light up the LCD display screen to meet the power size requirements of the intrinsically safe power supply.

[0052] The first backlight control module is provided with a fourth optical coupler and a fifth optical coupler, wherein the 1st pin of the fourth optical coupler is connected in series with a resistor R30 and then electrically connected to the first power supply end, the 4th pin of the fourth optical coupler is connected in parallel with the 1st port of the LCD_EN plug-in and then connected to the drain of the transistor Q10 of the first circuit; the 3rd pin of the fourth optical coupler is connected in parallel with the 2nd port of the LCD_EN plug-in and one end of the resistor R42, the 1st pin of the fifth optical coupler is connected in series with a resistor R31 and then electrically connected to the 4th port of the audio backlight connector P1, and the 4th pin of the fifth optical coupler is connected in parallel with the other end of the resistor R42 and the output end DIM_1 of the first backlight control module.

[0053] The circuit structure of the second backlight control module is the same as that of the first backlight control module, and the output terminal DIM_2 of the second backlight control module is electrically connected to the input terminal of the fourth circuit.

[0054] The first circuit includes a connector CN2, wherein port 1 of the connector CN2 is connected in parallel to a voltage input terminal and a diode D4, wherein the diode D4 is connected in series to a diode D5 and then connected to one end of a resistor R34, one end of a resistor R35, one end of a resistor R32, and an emitter of a transistor Q6, wherein the other end of the resistor R34 is connected in parallel to a base of the transistor Q6 and a source of the transistor Q10, wherein a node between a gate of the transistor Q10 and a collector of the transistor Q6 is connected in parallel to the other end of the resistor R35 and a collector of the transistor Q8, wherein a base of the transistor Q8 is connected in parallel to the other end of the resistor R35, one end of a capacitor C30, and one end of a resistor R36, wherein an emitter of the transistor Q8 is electrically connected to one end of a resistor R40, and port 2 of the connector CN2, the other end of the capacitor C30, the other end of the resistor R36, and the other end of the resistor R40 are connected in parallel and then grounded.

[0055] The second circuit includes a third chip, wherein pin 2 of the third chip is connected in parallel to one end of a capacitor C32, one end of a capacitor C34 and a ground line, pin 3 of the third chip is connected in parallel to one end of a capacitor C36, one end of a resistor R47 and one end of a resistor R43, the other end of the capacitor C36 and the other end of the resistor R47 are connected in parallel and then grounded, and the other end of the resistor R43 is electrically connected to pin 4 of the fifth optical coupler; pin 1 of the third chip is connected in parallel to one end of a diode D8 and one end of an inductor U15, the other end of the diode D8, the other end of the capacitor C34, the other end of the capacitor C32 and pin 5 of the third chip are connected in parallel and then electrically connected to the first backlight control module. The output terminal DIM_1 and one end of the resistor R50; the other end of the inductor U15 is connected in parallel with one end of the capacitor C38, one end of the capacitor C42, the cathode of the diode LED1 and the 2nd port of the connector U17; the 4th pin of the third chip, the other end of the resistor R50, the other end of the capacitor C38, the other end of the capacitor C42 and one end of the resistor R52 are connected in parallel and then connected to the 1st port of the connector U17; the other end of the resistor R52 is electrically connected to the anode of the diode LED1, and the other end of the capacitor C39 is grounded; the circuit structure of the third circuit is the same as that of the first circuit, and the circuit structure of the fourth circuit is the same as that of the second circuit. The third chip adopts the PT4115 model, which converts the constant voltage input into the constant current output required by the LED lamp beads.

[0056] The utility model supports the Android 11 system, can realize the running of more applications and the realization of customized functions, uses a high-performance AI processor, 8GB of memory, and 128GB of flash memory, providing fast content processing and large-capacity storage capabilities; the display screen of the utility model uses a 55-inch high-definition LCD screen with a resolution of 1080P and a refresh rate of 60Hz, which makes it easier to see the content on the display screen in the dark environment of a coal mine; the utility model has Ethernet electrical port communication technology, HDMI input interface, and supports USB interface data transmission, providing more options for device connection and data transmission, and providing more flexible data exchange and external expansion connection methods; the surface of the outer shell is sprayed with plastic, and has good corrosion resistance and anti-static properties.

[0057] Regarding the specific structure of the utility model, it should be explained that the connection relationship between the various component modules adopted in the utility model is definite and feasible. Except for special instructions in the embodiments, the specific connection relationship can bring corresponding technical effects and solve the technical problems raised by the utility model without relying on the execution of corresponding software programs. The components, modules, models of specific components and the connection methods between each other appearing in the utility model, as well as the conventional use methods and expected technical effects brought about by the above-mentioned technical features, except for specific instructions, all belong to the disclosed contents in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by technical personnel in this field before the application date, or belong to the existing technologies such as conventional technologies and common knowledge in this field, and there is no need to elaborate, so that the technical solution provided in this case is clear, complete and feasible, and the corresponding physical products can be reproduced or obtained according to the technical means.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A mine-use intelligent explosion-proof display screen, characterized in that: It includes a housing made of Q235A steel and an intrinsically safe power supply, wherein a circuit board is arranged in the housing, and a driving board, a main board and an LCD backlight board are arranged on the circuit board; The driving board is provided with a first audio backlight control module, and the first audio backlight control module is electrically connected to an audio transformer isolation module, an optocoupler isolation module on the backlight driving module and a second audio backlight control module on the main board; The audio transformer isolation module is electrically connected to the audio driving module; The audio driving module is electrically connected to a speaker and a first intrinsically safe power supply; The backlight driving module is electrically connected to an LCD backlight panel and a plurality of intrinsically safe power supplies; a plurality of groups of LED lights are arranged on the LCD backlight panel, and each group of LED lights is powered separately; The mainboard is also provided with a power supply interface and several communication interfaces; the communication interface includes an LVDS interface, a network port, a USB interface and an HDMI interface; the LVDS interface is electrically connected to a display screen; the network port is electrically connected to a fiber optic network port board module, and the fiber optic network port board module is electrically connected to a second intrinsically safe power supply; the power supply interface is electrically connected to a third intrinsically safe power supply; The audio driving module includes a first chip; pin 1 of the first chip is connected in parallel with pin 2 of the first chip and then electrically connected to pin 3 of the first optical coupler; pin 3 of the first chip is connected in series with capacitor C14 and then connected to one end of resistor R19 and pin 6 of the first audio transformer, the other end of resistor R19 is grounded, and pin 1 of the first audio transformer is electrically connected to port 8 of the audio backlight connector P1; pin 5 of the first chip is connected in parallel with the first audio power input interface, one end of resistor R26 and one end of resistor R28, pin 6 of the first chip is connected in parallel with the first audio power input interface, one end of resistor R27 and one end of resistor R29, the other end of resistor R26 is connected in parallel with the other end of resistor R27 and then connected to the power supply, the other end of resistor R28 is connected in parallel with the other end of resistor R29 and then grounded; pin 12 of the first chip is connected in series with capacitor C17 and then connected to pin 6 of the second audio transformer, pin 1 of the second audio transformer is electrically connected to port 7 of the audio backlight connector P1; pin 13 of the first chip is electrically connected to the first audio power input interface, one end of resistor R26 and one end of resistor R28, the other end of resistor R26 and the other end of resistor R27 are connected in parallel to the power supply, the other end of resistor R28 and the other end of resistor R29 are connected in parallel to the ground; pin 12 of the first chip is connected in series with capacitor C17 and then connected to pin 6 of the second audio transformer, pin 1 of the second audio transformer is electrically connected to port 7 of the audio backlight connector P1; pin 13 of the first chip is electrically connected to the first Pin 3 of the second optical coupler, pin 17 of the first chip is connected in series with capacitor C22 and then connected to pin 18 of the first chip and one end of inductor L5, the other end of inductor L5 is connected in series with one end of capacitor C29 and port 1 of the second interface of the speaker; pin 21 of the first chip is connected in series with capacitor C21 and then connected to pin 20 of the first chip and one end of inductor L4, the other end of inductor L4 is connected in series with one end of capacitor C28 and port 2 of the second interface of the speaker, the other end of capacitor C28 and the other end of capacitor C29 The first chip is connected in parallel and then grounded; the 22nd pin of the first chip is connected in series with the capacitor C20, and then connected to the 23rd pin of the first chip and one end of the inductor L3; the other end of the inductor L3 is connected in series with the 2nd port of the first interface of the speaker and one end of the capacitor C27; the 26th pin of the first chip is connected in series with the capacitor C19, and then connected to the 25th pin of the first chip and one end of the inductor L2; the other end of the inductor L2 is connected in series with the 1st port of the first interface of the speaker and one end of the capacitor C26; the other end of the capacitor C26 is connected in parallel with the other end of the capacitor C27 and then grounded; Pin 1 of the first optical coupler is connected in series with a resistor R17 and then connected to the first power supply terminal, and pin 1 of the second optical coupler is connected in series with a resistor R15 and then connected to the first power supply terminal, and the first power supply terminal is also connected to port 1 of the audio backlight connector P1, the power interface U3, the output terminal of the control board enabling module, and the input terminal of the backlight driving module; The backlight driving module includes a first backlight control module and a second backlight control module; The input end of the first backlight control module is electrically connected to the first power supply end and the audio backlight connection socket P1, and the output end of the first backlight control module is electrically connected to the first circuit and the second circuit; the input end of the second backlight control module is electrically connected to the first power supply end and the audio backlight connection socket P1, and the output end of the second backlight control module is electrically connected to the third circuit and the fourth circuit; by controlling the first circuit, the second circuit, the third circuit and the fourth circuit, the LED light array is driven to light up the LCD display screen to meet the requirements of the power size of the intrinsically safe power supply.

2. The intelligent explosion-proof display screen for mining according to claim 1 is characterized in that: Pin 7 of the first chip is connected in parallel to one end of a resistor R22 and one end of a capacitor C12, the other end of the resistor R22 is connected to a power supply, pin 9 of the first chip is connected in parallel to one end of a capacitor C13 and one end of a resistor R24, the other end of the capacitor C13 is connected in parallel to the other end of the capacitor C12 and then grounded; pin 10 of the first chip is connected in parallel to the other end of the resistor R24 ​​and one end of a resistor R25, the other end of the resistor R25 is connected in parallel to pin 14 of the first chip and then grounded; pin 11 of the first chip is connected in series to capacitor C16 and then grounded; pin 15 of the first chip is connected in parallel to pin 16 of the first chip, pin 27 of the first chip, pin 28 of the first chip and a power supply, a number of capacitors are connected in parallel between pin 28 of the first chip and pin 29 of the first chip; pin 19 of the first chip is connected in parallel to pin 24 of the first chip and then grounded.

3. The intelligent explosion-proof display screen for mining according to claim 1 is characterized in that: Pin 2 of the first optical coupler is electrically connected to the collector of transistor Q5, the base of transistor Q5 is connected in series with resistor R18 and then electrically connected to port 6 of the audio backlight connector P1, the emitter of transistor Q5 is grounded, and pin 4 of the first optical coupler is connected in series with resistor R21 and then connected to a 12V power supply; Pin 2 of the second optocoupler is electrically connected to the collector of transistor Q4, the base of transistor Q4 is connected in series with resistor 16 and then electrically connected to port 5 of the audio backlight connector P1, the emitter of transistor Q5 is grounded, and pin 4 of the second optocoupler is connected in series with resistor R20 and then connected to a 12V power supply.

4. The intelligent explosion-proof display screen for mining according to claim 1 is characterized in that: The control board enabling module is provided with a third optical coupler, and the third optical coupler is electrically connected to the second chip.

5. The intelligent explosion-proof display screen for mining according to claim 4 is characterized in that: Pin 2 of the second chip is connected in parallel to one end of the resistor R1, one end of the capacitor C3, one end of the capacitor C2, one end of the capacitor C1 and one end of the diode D1; the other end of the resistor R1 is connected in parallel to port 1 of the second plug-in CH1 and pin 1 of the third optical coupler; pin 6 of the second chip is connected in parallel to port 2 of the second plug-in CH1 and pin 2 of the third optical coupler; pin 7 of the second chip is connected in parallel to one end of the resistor R2 and one end of the capacitor C4; pin 1 of the second chip is connected in parallel to the other end of the resistor R2 and one end of the capacitor C5; the other end of the resistor R2 is also connected in parallel to one end of the resistor R3; the other end of the resistor R3, the other end of the capacitor C5, the other end of the capacitor C4, the other end of the capacitor C3, the other end of the capacitor C2 and the other end of the capacitor C1 are connected in parallel and then grounded; pin 4 of the third optical coupler is connected in series with resistor R9 and then electrically connected to the first power supply end.

6. The intelligent explosion-proof display screen for mining according to claim 1 is characterized in that: The first backlight control module is provided with a fourth optical coupler and a fifth optical coupler, the 1st pin of the fourth optical coupler is connected in series with a resistor R30 and then electrically connected to the first power supply end, the 4th pin of the fourth optical coupler is connected in parallel with the 1st port of the LCD_EN plug-in and then connected to the drain of the transistor Q10 of the first circuit; the 3rd pin of the fourth optical coupler is connected in parallel with the 2nd port of the LCD_EN plug-in and one end of the resistor R42, the 1st pin of the fifth optical coupler is connected in series with a resistor R31 and then electrically connected to the 4th port of the audio backlight connector P1, and the 4th pin of the fifth optical coupler is connected in parallel with the other end of the resistor R42 and the output end DIM_1 of the first backlight control module; The circuit structure of the second backlight control module is the same as that of the first backlight control module, and the output terminal DIM_2 of the second backlight control module is electrically connected to the input terminal of the fourth circuit.

7. The intelligent explosion-proof display screen for mining according to claim 1 is characterized in that: The first circuit includes a connector CN2, wherein port 1 of the connector CN2 is connected in parallel with a voltage input terminal and a diode D4, the diode D4 is connected in series with a diode D5, and is connected in parallel with one end of a resistor R34, one end of a resistor R35, one end of a resistor R32, and an emitter of a transistor Q6, the other end of the resistor R34 is connected in parallel with a base of the transistor Q6 and a source of the transistor Q10, the node between the gate of the transistor Q10 and the collector of the transistor Q6 is connected in parallel with the other end of the resistor R35 and the collector of the transistor Q8, the base of the transistor Q8 is connected in parallel with the other end of the resistor R35, one end of a capacitor C30, and one end of a resistor R36, the emitter of the transistor Q8 is electrically connected to one end of a resistor R40, and port 2 of the connector CN2, the other end of the capacitor C30, the other end of the resistor R36, and the other end of the resistor R40 are connected in parallel and then grounded.

8. The intelligent explosion-proof display screen for mining according to claim 1 is characterized in that: The second circuit includes a third chip, wherein the 2nd pin of the third chip is connected in parallel to one end of the capacitor C32, one end of the capacitor C34 and the ground line, the 3rd pin of the third chip is connected in parallel to one end of the capacitor C36, one end of the resistor R47 and one end of the resistor R43, the other end of the capacitor C36 and the other end of the resistor R47 are connected in parallel and then grounded, and the other end of the resistor R43 is electrically connected to the 4th pin of the fifth optical coupler; the 1st pin of the third chip is connected in parallel to one end of the diode D8 and one end of the inductor U15, the other end of the diode D8, the other end of the capacitor C34, and the other end of the capacitor C32 The inductor U15 is connected in parallel with the 5th pin of the third chip and then electrically connected to the output terminal DIM_1 of the first backlight control module and one end of the resistor R50; the other end of the inductor U15 is connected in parallel with one end of the capacitor C38, one end of the capacitor C42, the cathode of the diode LED1 and the 2nd port of the connector U17; the 4th pin of the third chip, the other end of the resistor R50, the other end of the capacitor C38, the other end of the capacitor C42 and one end of the resistor R52 are connected in parallel and then connected to the 1st port of the connector U17; the other end of the resistor R52 is electrically connected to the anode of the diode LED1, and the other end of the capacitor C39 is grounded; The circuit structure of the third circuit is the same as that of the first circuit, and the circuit structure of the fourth circuit is the same as that of the second circuit.

9. The intelligent explosion-proof display screen for mining according to claim 1 is characterized in that: Each set of LED lights is provided with a number of light strips, and each light strip is provided with a number of lamp beads.

10. The intelligent explosion-proof display screen for mining according to claim 1 is characterized in that: The model of the first chip is VA2213TSG28, the model of the second chip is HDR-IDC-2.54-2X5P, and the model of the third chip is PT4115; The first optical coupler, the second optical coupler, the third optical coupler and the fourth optical coupler are of the LTV217TP1B series; The first audio transformer and the second audio transformer are of ED8 series.

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