Mining intrinsic safety type embedded industrial control all-in-one machine touch display screen system

Abstract

The utility model relates to the field of touch display screens, and provides a mining intrinsic safety type embedded industrial control all-in-one machine touch display screen system which comprises a touch display screen body and a control circuit connected with the touch display screen body, and the control circuit comprises a central processing unit mainboard, a driving sub-circuit and a protection sub-circuit. The central processing unit mainboard, the driving sub-circuit and the touch display screen main body are sequentially connected, the central processing unit mainboard is used for outputting a video signal to the driving sub-circuit, the driving sub-circuit is used for generating a driving signal according to the video signal and outputting the driving signal to the touch display screen, an input end of the protection sub-circuit is connected with the central processing unit mainboard, and an output end of the protection sub-circuit is connected with the touch display screen. And the output end is connected with the driving sub-circuit and is used for carrying out short-circuit protection, overvoltage protection and differential pressure protection on the control circuit. The stability of data transmission and the reliability of the system are ensured through the control circuit, the protection circuit and the power supply system which are finely designed, and powerful technical support is provided for automatic production of the mining industry.

Description

Technical Field

[0001] The present application relates to the field of touch screen displays, and in particular to a mine-use intrinsically safe embedded industrial control all-in-one touch screen display system. Background Art

[0002] In coal mines and other mining industries, touchscreen displays are widely used as the core interface for human-machine interaction, playing a vital role in monitoring, control, and data processing. However, current mining-grade touchscreen displays on the market generally suffer from issues with safety, stability, and adaptability. Conventional touchscreen displays often lack intrinsic safety characteristics, making them difficult to meet the safety requirements of flammable and explosive environments like coal mines. Their embedded designs may be suboptimal, increasing the difficulty of installation and maintenance. Furthermore, their poor protection makes them susceptible to environmental factors such as dust, moisture, and vibration, shortening their service life and affecting display quality.

[0003] More importantly, the control circuits in existing touch screen display systems lack protection functions, and the transmitted data is noisy, making it difficult to meet the needs of automated mining production. Utility Model Content

[0004] In order to help solve the problem that existing touch screen display systems lack intrinsic safety characteristics and have high noise in transmitted data, the present application provides a mining intrinsically safe embedded industrial control all-in-one touch screen display system.

[0005] This application provides a mine-use intrinsically safe embedded industrial control all-in-one touch screen display system, which adopts the following technical solutions:

[0006] A mine-use intrinsically safe embedded industrial control all-in-one touch screen system, wherein the touch screen system includes a touch screen main body and a control circuit connected to the touch screen main body, the control circuit includes a central processing unit mainboard, a driving subcircuit and a protection subcircuit,

[0007] The central processing unit mainboard, the driving sub-circuit and the touch screen display main body are connected in sequence, the central processing unit mainboard is used to output a video signal to the driving sub-circuit, and the driving sub-circuit is used to generate a driving signal according to the video signal and output the driving signal to the touch screen.

[0008] The input end of the protection subcircuit is connected to the central processing unit mainboard, and the output end is connected to the driving subcircuit, which is used to perform short circuit protection, overvoltage protection and voltage difference protection on the control circuit.

[0009] By implementing the above technical solution, the basic control circuit framework for an intrinsically safe embedded industrial control all-in-one touchscreen display system for mining applications was constructed, clarifying the system's core components. The central processing unit (CPU) motherboard is responsible for data processing and overall operational control. The driver subcircuit acts as a signal transmission bridge, converting the CPU motherboard's video signals into drive signals for the touchscreen display. The protection subcircuit monitors circuit status in real time to prevent damage from abnormal conditions such as short circuits and overvoltage. This design not only improves system efficiency but also ensures stability and safety.

[0010] Preferably, the protection subcircuit includes a filter inductor, a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor and a second transistor.

[0011] One end of the first resistor is connected to the driving sub-circuit, and the other end is connected to the filter inductor.

[0012] One end of the second resistor is connected to the driving sub-circuit, and the other end is connected to the first capacitor.

[0013] One end of the third resistor is connected to the driving sub-circuit, and the other end is connected to the fourth resistor.

[0014] One end of the fifth resistor is connected to the central processing unit mainboard, and the other end is connected to the gate of the first transistor and the collector of the second transistor. The first resistor, the second resistor, the third resistor, the fourth resistor and the fifth resistor are used to limit the current and divide the voltage of the protection sub-circuit.

[0015] One end of the filter inductor is connected to the first resistor, and the other end is grounded.

[0016] One end of the first capacitor is connected to the second resistor, and the other end is grounded. The filter inductor and the first capacitor are used to filter out high-frequency noise in the protection sub-circuit.

[0017] The drain of the first transistor is connected to the base of the second transistor, the gate of the first transistor is connected to the collector of the second transistor, the source of the first transistor is grounded, and the emitter of the second transistor is used to connect to a DC power supply.

[0018] By adopting the above technical solution, the working principle and component composition of the protection subcircuit are elaborated in detail. The combination of filtering inductors and high-frequency capacitors effectively filters out high-frequency noise in the circuit, improving signal purity. A precisely designed resistor divider network accurately controls the voltage in the circuit to prevent overvoltage. At the same time, the protection circuit composed of transistors can quickly respond to abnormal conditions in the circuit, promptly disconnecting the faulty circuit and preventing the spread of damage. This comprehensive protection mechanism ensures the stable operation of the control circuit under harsh operating conditions.

[0019] Preferably, the driving sub-circuit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a second capacitor, a third capacitor, a third transistor, a fourth transistor, a fifth transistor and a sixth transistor.

[0020] The CPU mainboard has a first video signal output terminal, a second video signal output terminal, a third video signal output terminal and a fourth video signal output terminal.

[0021] One end of the sixth resistor is connected to the first video signal output end, and the other end is connected to the base of the third transistor.

[0022] One end of the seventh resistor is connected to the protection sub-circuit, and the other end is connected to the emitter of the third transistor.

[0023] One end of the ninth resistor is connected to the second video signal output end, and the other end is connected to the base of the fourth transistor.

[0024] One end of the tenth resistor is connected to the protection sub-circuit, and the other end is connected to the emitter of the fourth transistor.

[0025] One end of the eighth resistor is connected to the protection sub-circuit, and the other end is connected to the collector of the third transistor.

[0026] One end of the eleventh resistor is connected to the protection sub-circuit, and the other end is connected to the collector of the fourth transistor.

[0027] One end of the twelfth resistor is connected to the third video signal output terminal, and the other end is connected to the base of the fifth transistor.

[0028] One end of the thirteenth resistor is connected to the fourth video signal output end, and the other end is connected to the base of the sixth transistor. The sixth resistor, the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor, the twelfth resistor and the thirteenth resistor are used to divide the voltage of the video signal.

[0029] One end of the second capacitor is connected to the collector of the third transistor, and the other end is grounded.

[0030] One end of the third capacitor is connected to the collector of the fourth transistor, and the other end is grounded. The second capacitor and the third capacitor are used to filter out high-frequency noise in the driving sub-circuit.

[0031] The touch screen display body has a first interface, a second interface, a third interface and a fourth interface,

[0032] The collector of the third transistor is connected to the first interface, and the third transistor is used to amplify the video signal and transmit the video signal to the first interface.

[0033] The collector of the fourth transistor is connected to the second interface, and the fourth transistor is used to amplify the video signal and transmit the video signal to the second interface.

[0034] The collector of the fifth transistor is connected to the third interface, the emitter of the fifth transistor is grounded, and the fifth transistor is used to amplify the video signal and transmit the video signal to the third interface.

[0035] The collector of the sixth transistor is connected to the fourth interface of the touch screen display body, the emitter of the sixth transistor is grounded, and the sixth transistor is used to amplify the video signal and transmit the video signal to the fourth interface.

[0036] The above technical solution reveals the crucial role of the driver subcircuit in signal transmission. Through a carefully designed resistor divider network and transistor amplifier circuit, the driver subcircuit effectively amplifies the weak video signal output by the CPU motherboard while simultaneously filtering out noise interference during transmission, ensuring signal integrity and accuracy. This design not only improves the touchscreen display's visual quality but also enhances the system's anti-interference capabilities.

[0037] Preferably, the touch screen display system further includes an arc extinguishing plug and an intrinsically safe power supply connecting the control circuit and the touch screen display body.

[0038] The intrinsically safe power supply includes an isolation transformer, an AC-DC converter and a voltage stabilizer connected in sequence.

[0039] The primary coil of the isolation transformer is used to connect to the arc extinguishing plug, to electrically isolate the intrinsically safe power supply from the grid power supply, and to generate an AC power supply based on the grid power supply.

[0040] The AC-DC converter is connected to the secondary coil of the isolation transformer and is used to convert the AC power supply into a DC power supply.

[0041] The voltage stabilizer is connected to the control circuit and the touch screen display body, and is used for performing voltage stabilization processing on the DC power supply.

[0042] The adoption of these technical solutions emphasizes the importance of an intrinsically safe power supply in ensuring safe and stable system operation. The electrical isolation provided by the isolation transformer effectively prevents the impact of grid fluctuations on the system power supply. The AC-DC converter design enables the system to receive stable DC power, reducing the complexity of power processing. The addition of a voltage regulator further ensures power output stability, preventing voltage fluctuations from damaging system components. This design principle ensures a stable and reliable power supply even under complex operating conditions.

[0043] Preferably, the arc-extinguishing plug comprises an arc-extinguishing plug housing, a power supply line, and a pin embedded in the arc-extinguishing plug housing.

[0044] An elastic transition connector and separated power supply line conductors and pin conductors are provided in the arc extinguishing plug housing. The power supply line conductor is electrically connected to the power supply line, and the pin conductor is electrically connected to the pin. The elastic transition connector is used to connect and disconnect the pin and the power supply line.

[0045] The above technical solution helps address safety issues during power plugging and unplugging. By employing a flexible transition connector, the arc-extinguishing plug effectively suppresses arcing during the plugging and unplugging process, preventing potential sparks from posing a threat to flammable and explosive environments. This design not only improves system safety but also extends the plug's lifespan and reduces maintenance costs.

[0046] Preferably, the control circuit further includes an intrinsically safe USB interface subcircuit, and the touch screen display system further includes an intrinsically safe USB interface body connected to the control circuit.

[0047] The central processing unit mainboard is connected to the intrinsically safe USB interface body through the intrinsically safe USB interface subcircuit, and the intrinsically safe USB interface subcircuit includes a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor.

[0048] The intrinsically safe USB interface body has an intrinsically safe USB power port, a positive data port and a negative data port, and the central processing unit motherboard has a central processing unit motherboard power port, a first input / output port and a second input / output port.

[0049] The cathodes of the first diode and the second diode are both connected to the negative data port, one end of the fourteenth resistor is connected to the negative data port, and the other end is connected to the second input / output port.

[0050] The cathodes of the third diode and the fourth diode are both connected to the forward data port, one end of the fifteenth resistor is connected to the forward data port, and the other end is connected to the first input / output port.

[0051] The cathodes of the fifth diode and the sixth diode are both connected to the intrinsically safe USB power port, one end of the sixteenth resistor is connected to the intrinsically safe USB power port, and the other end is connected to the CPU motherboard power port.

[0052] The fourteenth resistor, the fifteenth resistor and the sixteenth resistor are used to limit the current value transmitted from the intrinsically safe USB interface body to the central processing unit mainboard, and the first diode, the second diode, the third diode, the fourth diode, the fifth diode and the sixth diode are used to limit the reverse voltage within the intrinsically safe USB interface sub-circuit.

[0053] The above technical solution emphasizes the importance of an intrinsically safe USB interface subcircuit in ensuring data transmission security. Through a carefully designed combination of diodes and resistors, this circuit strictly isolates and limits current and voltage on USB interface signals, preventing external devices from damaging or interfering with the system. This design not only improves data transmission stability and reliability but also ensures safe operation of the system under complex operating conditions.

[0054] Preferably, the touch screen display system further includes an intrinsically safe protective housing and an embedded mounting frame.

[0055] The touch display screen body is embedded in the intrinsically safe protective shell through the embedded mounting frame. An installation cavity is provided inside the intrinsically safe protective shell body. The installation cavity is used to accommodate the control circuit. The intrinsically safe USB interface body is embedded in the intrinsically safe protective shell.

[0056] The above technical solution emphasizes the critical role of the intrinsically safe protective housing and embedded mounting frame in protecting the system from external interference and damage. The intrinsically safe protective housing, constructed using high-strength materials and precision manufacturing processes, effectively withstands physical impact and chemical corrosion in harsh environments such as mines. The embedded mounting frame, with its precisely designed mounting structure and fastener combination, ensures the touchscreen display's secure installation and operation within the housing. This design not only improves the system's protection level and service life, but also enhances the user experience.

[0057] Preferably, the embedded mounting frame includes a mounting seat and a fixing member, the mounting seat is fixed at a preset mounting position of the mining equipment, and the intrinsically safe protective housing is detachably mounted on the mounting seat via the fixing member.

[0058] By adopting the above technical solution, the specific implementation and advantages of the embedded mounting frame are described in detail. By securing the mounting base to the pre-set mounting position of the mining equipment and securely attaching the intrinsically safe protective housing to it using fasteners, the touchscreen display system can be quickly installed and removed. This design not only improves system installation efficiency and flexibility but also facilitates subsequent maintenance and upgrades. Furthermore, the stable mounting structure ensures stable operation and a long service life in harsh operating conditions.

[0059] In summary, this application has designed a highly secure and stable intrinsically safe embedded industrial control all-in-one touchscreen display system for mining applications. This system not only meets mining environmental requirements such as explosion-proof, waterproof, and dustproof, but also ensures data transmission stability and system reliability through carefully designed control circuits, protection circuits, and power supply systems. This significantly improves the performance and service life of mining touchscreen displays in harsh working environments, providing strong technical support for automated mining production. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 This is a schematic block diagram of an embodiment of a mine-use intrinsically safe embedded industrial control all-in-one touch screen display system of the present application;

[0061] Figure 2 A schematic block diagram of an embodiment of a control circuit of the present application;

[0062] Figure 3 for Figure 2 A schematic structural diagram of an embodiment of a protection sub-circuit in the illustrated embodiment;

[0063] Figure 4 for Figure 2 A schematic structural diagram of an embodiment of a driving sub-circuit in the illustrated embodiment;

[0064] Figure 5 for Figure 2 A schematic structural diagram of an embodiment of an intrinsically safe USB interface subcircuit in the illustrated embodiment;

[0065] Figure 6 This is a schematic block diagram of an embodiment of the intrinsically safe power supply of the present application.

[0066] Figure numerals: 1. Intrinsically safe power supply; 2. Intrinsically safe protective shell; 3. Touch screen main body; 4. Control circuit; 6. Protection subcircuit; 7. Central processing unit main board; 8. Driving subcircuit; 9. Intrinsically safe USB interface subcircuit; 10. Intrinsically safe USB interface main body; 11. First video signal output terminal; 12. Second video signal output terminal; 13. Third video signal output terminal; 14. Fourth video signal output terminal; 15. Arc extinguishing plug; 16. Isolation transformer; 17. AC-DC converter; 18. Voltage stabilizer. DETAILED DESCRIPTION

[0067] With reference to the accompanying drawings and specific embodiments, the structure, composition, characteristics and advantages of a mine-use intrinsically safe embedded industrial control all-in-one touch display system according to the present application will be described below in an exemplary manner. However, all descriptions should not be used to form any limitations on the present application.

[0068] In addition, for any single technical feature described or implied in the embodiments mentioned in this document, or any single technical feature shown or implied in the drawings, this application still allows for continued arbitrary combination or deletion between these technical features (or their equivalents) without any technical obstacles, and thus it should be considered that these more embodiments according to this application are also within the scope of the description in this document.

[0069] It should also be noted that terms such as "disposed" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integration; they can refer to direct connections or indirect connections through an intermediary. Unless otherwise specified, those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0070] Figure 1 This is a schematic block diagram of an embodiment of a mine intrinsically safe embedded industrial control all-in-one touch screen display system of this application. Figure 1 As can be seen in the figure, the touch screen display system can include an intrinsically safe power supply 1, an intrinsically safe protective housing 2, a touch screen display body 3, a control circuit 4, and an intrinsically safe USB interface body 10. The intrinsically safe power supply 1 is connected to the touch screen display body 3 and the control circuit 4, respectively, for powering the touch screen system. The intrinsically safe protective housing 2 houses the touch screen display body 3, the control circuit 4, and the intrinsically safe USB interface body 10. The control circuit 4 connects the touch screen body 3 and the intrinsically safe USB interface body 10. The intrinsically safe USB interface body 10 allows the touch screen system to exchange data with external devices. The control circuit 4 is the core of the touch screen display system, responsible for processing video signals and transmitting the processed results to the touch screen body 3 for display.

[0071] Figure 2This is a schematic block diagram of an embodiment of the control circuit of the present application. Figure 2 As can be seen in the figure, the control circuit 4 may include a central processing unit mainboard 7, a driving subcircuit 8, and a protection subcircuit 6. The central processing unit mainboard 7, the driving subcircuit 8, and the touch screen display main body 3 are connected in sequence. The central processing unit mainboard 7 is used to output a video signal to the driving subcircuit 8. The driving subcircuit 8 is used to generate a driving signal based on the video signal and output the driving signal to the touch screen. The input end of the protection subcircuit 6 is connected to the central processing unit mainboard 7, and the output end is connected to the driving subcircuit 8. It is used to provide short-circuit protection, overvoltage protection, and voltage difference protection for the control circuit 4.

[0072] Specifically, Figure 3 for Figure 2 A schematic diagram of the structure of an embodiment of the protection sub-circuit in the embodiment shown. Figure 3 In the embodiment shown, the protection subcircuit 6 may include a filter inductor, a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor and a second transistor. The filter inductor may be Figure 3 In L1, the first resistor to the fifth resistor can be Figure 3 Among R1 to R5, the first transistor can be Figure 3 In Q1, the second transistor can be Figure 3 Q2 in.

[0073] from Figure 3 It can be seen that one end of R1 is connected to the driving sub-circuit 8, and the other end is connected to L1, one end of R2 is connected to the driving sub-circuit 8, and the other end is connected to C1, one end of R3 is connected to the driving sub-circuit 8, and the other end is connected to R4, one end of R5 is connected to the central processing unit motherboard 7, and the other end is connected to the gate of Q1 and the collector of Q2, R1, R2, R3, R4 and R5 are used to limit the current and divide the voltage of the protection sub-circuit 6, one end of L1 is connected to R1, and the other end is grounded, one end of C1 is connected to R2, and the other end is grounded, L1 and C1 are used to filter out high-frequency noise in the protection sub-circuit 6, the drain of Q1 is connected to the base of Q2, the gate of Q1 is connected to the collector of Q2, the source of Q1 is grounded, and the emitter of Q2 is connected to the DC power supply VCC.

[0074] L1, as an energy storage element, can quickly absorb and limit sudden current surges during a short circuit. Working in conjunction with R1, it forms an LC filter circuit, reducing high-frequency interference and inrush current, thereby protecting subsequent circuits from damage. C1 and R2, connected in parallel, form an RC filter network, filtering out ripple and noise from the power supply, ensuring stable voltage supplied to the driver circuit and minimizing the impact of voltage fluctuations on the circuit. R1 through R5 function within the circuit as voltage dividers, current limiters, and load matchers. In particular, R5, as the input resistor of protection subcircuit 6, limits the current entering the core protection circuit, preventing overloads on Q1 and Q2. Q1, as the core control element of protection subcircuit 6, adjusts its conduction and cutoff states based on the input voltage and current to provide overvoltage and short-circuit protection. Q2, as an auxiliary protection element, enhances protection through a feedback mechanism, ensuring rapid power shutoff or circuit adjustment in abnormal situations.

[0075] Figure 4 for Figure 2 A schematic diagram of the structure of an embodiment of the driving sub-circuit in the embodiment shown. Figure 4 In the embodiment shown, the driving sub-circuit 8 may include a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a second capacitor, a third capacitor, a third transistor, a fourth transistor, a fifth transistor, and a sixth transistor. In this embodiment, the CPU motherboard 7 has a first video signal output terminal 11, a second video signal output terminal 12, a third video signal output terminal 13, and a fourth video signal output terminal 14. The sixth to thirteenth resistors may be Figure 4 R6 to R13, the second capacitor can be Figure 4 The third capacitor can be C2. Figure 4 In C3, the third to sixth transistors can be Figure 4 Q3 to Q6 in the first to fourth interfaces can be respectively Figure 4 X+, Y+, X- and Y- in .

[0076] Specifically, Figure 4 R8 and R11 in Figure 3 R2 and R3 are connected, Figure 4 R7, R10 and Figure 3R1 in the figure is connected. One end of R6 is connected to the first video signal output terminal 11, and the other end is connected to the base of Q3. One end of R7 is connected to the protection sub-circuit 6, and the other end is connected to the emitter of Q3. One end of R9 is connected to the second video signal output terminal 12, and the other end is connected to the base of Q4. One end of R10 is connected to the protection sub-circuit 6, and the other end is connected to the emitter of Q4. One end of R8 is connected to the protection sub-circuit 6, and the other end is connected to the collector of Q3. One end of R11 is connected to the protection sub-circuit 6, and the other end is connected to the collector of Q4. One end of R12 is connected to the third video signal output terminal 13, and the other end is connected to the base of Q5. One end of R13 is connected to the fourth video signal output terminal 14, and the other end is connected to the base of Q6. R6, R7, R8, R9, R10, R11, R12 and R13 are used to divide the voltage of the video signal. One end of C2 is connected to the collector of Q3, and the other end is grounded. One end of C3 is connected to the collector of Q4, and the other end is grounded. C2 and C3 are used to filter out high-frequency noise within the driver sub-circuit 8. The touch screen display body 3 has a first interface, a second interface, a third interface, and a fourth interface. The collector of Q3 is connected to the first interface, and Q3 is used to amplify the video signal and transmit the video signal to the first interface. The collector of Q4 is connected to the second interface, and Q4 is used to amplify the video signal and transmit the video signal to the second interface. The collector of Q5 is connected to the third interface, and the emitter of Q5 is grounded. Q5 is used to amplify the video signal and transmit the video signal to the third interface. The collector of Q6 is connected to the fourth interface of the touch screen display body 3, and the emitter of Q6 is grounded. Q6 is used to amplify the video signal and transmit the video signal to the fourth interface.

[0077] In this embodiment, an ARM7TDMI-based S3C44B0X embedded microprocessor can be used as the core chip of the central processing unit motherboard 7. The GPC0 pin, GPC1 pin, GPC2 pin and GPC3 pin of the central processing unit motherboard 7 can be respectively used as the first video signal output terminal 11 to the fourth video signal output terminal 14 of the central processing unit motherboard 7, and the A / D conversion input interface in the touch display screen body 3 is respectively connected to X+, Y+, X- and Y-.

[0078] The four video output signals of the CPU motherboard 7 are divided by resistors R6 to R13 and input to the base of Q3 to Q6. After amplification, they are output to the corresponding interface of the touch screen main body 3, thereby driving the screen to display images. R6 to R13 play the role of current limiting, voltage dividing and signal matching in the circuit to ensure the input Figure 4The signal amplitude and current of the transistors in the circuit are kept within reasonable ranges, preventing transistor overload or nonlinear operation. C2 and C3, connected in parallel with R8 and R11, form an RC filter network, filtering out high-frequency noise and interference in the signal, improving signal quality and ensuring a clear and stable display. Through the precise matching and layout of these components, driver subcircuit 8 achieves efficient and stable signal amplification and transmission, providing high-quality video signal input to touchscreen display body 3.

[0079] The CPU mainboard 7 is connected to the intrinsically safe USB interface body 10 via the intrinsically safe USB interface subcircuit 9. Figure 5 for Figure 2 The schematic diagram of the structure of an embodiment of the intrinsically safe USB interface sub-circuit 9 in the embodiment shown is shown. Figure 5 In the embodiment shown, the intrinsically safe USB interface subcircuit 9 may include a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor. The first to sixth diodes may be Figure 5 D1 to D6, the fourteenth to sixteenth resistors can be Figure 5 The intrinsically safe USB interface body 10 has an intrinsically safe USB power port, a positive data port and a negative data port, and the central processing unit motherboard 7 has a central processing unit motherboard 7 power port, a first input / output port and a second input / output port. The first input / output port and the second input / output port can be respectively Figure 5 I / O1 and I / O2 in the Intrinsically Safe USB power port can be Figure 5 The +5V port, positive data port and negative data port are Figure 5 The “+” and “-” in the USB interface body 10 of Zhong Benan.

[0080] The negative poles of D1 and D2 are both connected to the negative data port, one end of R14 is connected to the negative data port, and the other end is connected to I / O2, the negative poles of D3 and D4 are both connected to the positive data port, one end of R15 is connected to the positive data port, and the other end is connected to I / O1, the negative poles of D5 and D6 are both connected to the intrinsically safe USB power port, one end of R16 is connected to the intrinsically safe USB power port, and the other end is connected to the power port of the central processing unit main board 7, R14, R15 and R16 are used to limit the current value transmitted from the intrinsically safe USB interface body 10 to the central processing unit main board 7, and D1, D2, D3, D4, D5 and D6 are used to limit the reverse voltage within the intrinsically safe USB interface sub-circuit 9.

[0081] R14 through R16 act as current-limiting resistors, connected in series with the positive data port, negative data port, and power port of the intrinsically safe USB interface 10. These resistors limit the current flowing through these ports, preventing damage to the device or potential safety hazards caused by excessive current. D1 through D6, by their forward conduction and reverse blocking properties, provide reverse voltage protection for the signal and power supply of the intrinsically safe USB interface 10. When reverse voltage is applied to the interface, D1 through D6 block the current, protecting the internal circuitry from damage. Furthermore, using multiple diodes D1 through D6 in parallel improves reverse voltage tolerance and circuit reliability.

[0082] In this embodiment, the intrinsically safe USB interface body 10 can supply a current of no more than 200mA, a voltage of no more than 6.8V, and currents for both negative and positive signals no more than 50mA. The current-limiting resistors, comprised of resistors R14, R15, and R16, are packaged as wire-wound power resistors, providing protection against loosening in the event of a wire break. Their only failure mode is an open circuit. The intrinsically safe USB interface subcircuit 9, constructed in this manner, can isolate and limit current and voltage, limiting the energy input to the CPU motherboard 7 to within a safe range and preventing explosions caused by circuit failures.

[0083] Through the precise design and rational layout of these components, the intrinsically safe USB interface subcircuit 9 successfully implements the safe isolation and current-limiting protection functions of the USB interface, ensuring the safety and stability of the mine-use intrinsically safe embedded industrial control all-in-one touch screen when connected to external devices.

[0084] The touch display screen system of the present application may further include an arc extinguishing plug 15 . Figure 6 This is a schematic block diagram of an embodiment of the intrinsically safe power supply 1 of the present application. In this embodiment, the intrinsically safe power supply 1 may include an isolation transformer 16, an AC-DC converter 17, and a voltage regulator 18 connected in sequence. The primary coil of the isolation transformer 16 is connected to an arc extinguishing plug 15, which is used to electrically isolate the intrinsically safe power supply 1 from the grid power supply and generate AC power based on the grid power supply. The AC-DC converter 17 is connected to the secondary coil of the isolation transformer 16 and is used to convert the AC power into DC power. The voltage regulator 18 is connected to the control circuit 4 and the touch screen display body 3 and is used to stabilize the DC power supply. The electrical isolation function of the isolation transformer 16 effectively prevents the impact of grid fluctuations on the system power supply. The design of the AC-DC converter 17 enables the system to stably receive DC power supply, reducing the complexity of power supply processing. The addition of the voltage regulator 18 further ensures the stability of the power output and prevents voltage fluctuations from damaging the various components of the system. This design principle ensures that the system can obtain a stable and reliable power supply under complex operating conditions.

[0085] Specifically, the arc extinguishing plug 15 may include an arc extinguishing plug 15 housing, a power supply line, and pins embedded in the arc extinguishing plug 15 housing. An elastic transition connector and separate power supply line conductors and pin conductors are provided within the arc extinguishing plug 15 housing. The power supply line conductors are electrically connected to the power supply line, and the pin conductors are electrically connected to the pins. The elastic transition connector is used to connect and disconnect the pins and the power supply line, while the power supply line conductors and the pin conductors remain separate. When the arc extinguishing plug 15 is plugged in, the elastic transition connector establishes electrical connections with the pin conductors and the power supply line conductors, respectively, thereby connecting the pins and the power supply line. When the arc extinguishing plug 15 is unplugged, the elastic transition connector disconnects from both conductors, severing the circuit. The arc extinguishing plug 15 of this structure can effectively prevent arcing, avoid sparks, and ensure safety in mines. The arc extinguishing plug 15 can effectively suppress arcing during plugging and unplugging, avoiding the potential threat of sparks to the surrounding flammable and explosive environment. This design not only improves the safety of the system, but also extends the service life of the plug and reduces maintenance costs.

[0086] In addition, the touch screen display system may further include an intrinsically safe protective housing and an embedded mounting frame. The touch screen display body 3 is embedded in the intrinsically safe protective housing via the embedded mounting frame. The intrinsically safe protective housing body is provided with an installation cavity for accommodating the control circuit 4. The intrinsically safe USB interface body 10 is embedded in the intrinsically safe protective housing. The embedded mounting frame may include a mounting seat and a fixing member. The mounting seat is fixed to a preset mounting position of the mining equipment. The intrinsically safe protective housing is removably mounted to the mounting seat via the fixing member. The use of the embedded mounting frame allows the touch screen display body 3 to be securely mounted on the mining equipment, making it less susceptible to external collisions and interference.

[0087] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A mine-use intrinsically safe embedded industrial control integrated computer touch screen display system, characterized in that: The touch screen system includes a touch screen main body and a control circuit connected to the touch screen main body, wherein the control circuit includes a central processing unit mainboard, a driving subcircuit and a protection subcircuit. The central processing unit mainboard, the driving sub-circuit and the touch screen display main body are connected in sequence, the central processing unit mainboard is used to output a video signal to the driving sub-circuit, and the driving sub-circuit is used to generate a driving signal according to the video signal and output the driving signal to the touch screen. The input end of the protection subcircuit is connected to the central processing unit mainboard, and the output end is connected to the driving subcircuit, which is used to perform short circuit protection, overvoltage protection and voltage difference protection on the control circuit.

2. The touch display screen system according to claim 1, characterized in that: The protection subcircuit includes a filter inductor, a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor and a second transistor. One end of the first resistor is connected to the driving sub-circuit, and the other end is connected to the filter inductor. One end of the second resistor is connected to the driving sub-circuit, and the other end is connected to the first capacitor. One end of the third resistor is connected to the driving sub-circuit, and the other end is connected to the fourth resistor. One end of the fifth resistor is connected to the central processing unit mainboard, and the other end is connected to the gate of the first transistor and the collector of the second transistor. The first resistor, the second resistor, the third resistor, the fourth resistor and the fifth resistor are used to limit the current and divide the voltage of the protection sub-circuit. One end of the filter inductor is connected to the first resistor, and the other end is grounded. One end of the first capacitor is connected to the second resistor, and the other end is grounded. The filter inductor and the first capacitor are used to filter out high-frequency noise in the protection sub-circuit. The drain of the first transistor is connected to the base of the second transistor, the gate of the first transistor is connected to the collector of the second transistor, the source of the first transistor is grounded, and the emitter of the second transistor is used to connect to a DC power supply.

3. The touch display screen system according to claim 1, wherein: The driving sub-circuit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a second capacitor, a third capacitor, a third transistor, a fourth transistor, a fifth transistor and a sixth transistor, The CPU mainboard has a first video signal output terminal, a second video signal output terminal, a third video signal output terminal and a fourth video signal output terminal. One end of the sixth resistor is connected to the first video signal output end, and the other end is connected to the base of the third transistor. One end of the seventh resistor is connected to the protection sub-circuit, and the other end is connected to the emitter of the third transistor. One end of the ninth resistor is connected to the second video signal output end, and the other end is connected to the base of the fourth transistor. One end of the tenth resistor is connected to the protection sub-circuit, and the other end is connected to the emitter of the fourth transistor. One end of the eighth resistor is connected to the protection sub-circuit, and the other end is connected to the collector of the third transistor. One end of the eleventh resistor is connected to the protection sub-circuit, and the other end is connected to the collector of the fourth transistor. One end of the twelfth resistor is connected to the third video signal output terminal, and the other end is connected to the base of the fifth transistor. One end of the thirteenth resistor is connected to the fourth video signal output end, and the other end is connected to the base of the sixth transistor. The sixth resistor, the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor, the twelfth resistor and the thirteenth resistor are used to divide the voltage of the video signal. One end of the second capacitor is connected to the collector of the third transistor, and the other end is grounded. One end of the third capacitor is connected to the collector of the fourth transistor, and the other end is grounded. The second capacitor and the third capacitor are used to filter out high-frequency noise in the driving sub-circuit. The touch screen display body has a first interface, a second interface, a third interface and a fourth interface, The collector of the third transistor is connected to the first interface, and the third transistor is used to amplify the video signal and transmit the video signal to the first interface. The collector of the fourth transistor is connected to the second interface, and the fourth transistor is used to amplify the video signal and transmit the video signal to the second interface. The collector of the fifth transistor is connected to the third interface, the emitter of the fifth transistor is grounded, and the fifth transistor is used to amplify the video signal and transmit the video signal to the third interface. The collector of the sixth transistor is connected to the fourth interface of the touch screen display body, the emitter of the sixth transistor is grounded, and the sixth transistor is used to amplify the video signal and transmit the video signal to the fourth interface.

4. The touch display screen system according to claim 1, wherein: The touch screen display system further includes an arc extinguishing plug and an intrinsically safe power supply connecting the control circuit and the touch screen display body. The intrinsically safe power supply includes an isolation transformer, an AC-DC converter and a voltage stabilizer connected in sequence. The primary coil of the isolation transformer is used to connect to the arc extinguishing plug, to electrically isolate the intrinsically safe power supply from the grid power supply, and to generate an AC power supply based on the grid power supply. The AC-DC converter is connected to the secondary coil of the isolation transformer and is used to convert the AC power supply into a DC power supply. The voltage stabilizer is connected to the control circuit and the touch screen display body, and is used for performing voltage stabilization processing on the DC power supply.

5. The touch display screen system according to claim 4, characterized in that: The arc extinguishing plug includes an arc extinguishing plug shell, a power supply line, and a pin embedded in the arc extinguishing plug shell. An elastic transition connector and separated power supply line conductors and pin conductors are provided in the arc extinguishing plug housing. The power supply line conductor is electrically connected to the power supply line, and the pin conductor is electrically connected to the pin. The elastic transition connector is used to connect and disconnect the pin and the power supply line.

6. The touch display screen system according to claim 1, wherein: The control circuit further includes an intrinsically safe USB interface subcircuit, and the touch screen display system further includes an intrinsically safe USB interface body connected to the control circuit. The central processing unit mainboard is connected to the intrinsically safe USB interface body through the intrinsically safe USB interface subcircuit, and the intrinsically safe USB interface subcircuit includes a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor. The intrinsically safe USB interface body has an intrinsically safe USB power port, a positive data port and a negative data port, and the central processing unit motherboard has a central processing unit motherboard power port, a first input / output port and a second input / output port. The cathodes of the first diode and the second diode are both connected to the negative data port, one end of the fourteenth resistor is connected to the negative data port, and the other end is connected to the second input / output port. The cathodes of the third diode and the fourth diode are both connected to the forward data port, one end of the fifteenth resistor is connected to the forward data port, and the other end is connected to the first input / output port. The cathodes of the fifth diode and the sixth diode are both connected to the intrinsically safe USB power port, one end of the sixteenth resistor is connected to the intrinsically safe USB power port, and the other end is connected to the CPU motherboard power port. The fourteenth resistor, the fifteenth resistor and the sixteenth resistor are used to limit the current value transmitted from the intrinsically safe USB interface body to the central processing unit mainboard, and the first diode, the second diode, the third diode, the fourth diode, the fifth diode and the sixth diode are used to limit the reverse voltage within the intrinsically safe USB interface sub-circuit.

7. The touch display screen system according to claim 6, characterized in that: The touch screen display system also includes an intrinsically safe protective housing and an embedded mounting frame. The touch display screen body is embedded in the intrinsically safe protective shell through the embedded mounting frame. An installation cavity is provided inside the intrinsically safe protective shell body. The installation cavity is used to accommodate the control circuit. The intrinsically safe USB interface body is embedded in the intrinsically safe protective shell.

8. The touch display screen system according to claim 7, wherein: The embedded mounting frame includes a mounting seat and a fixing piece. The mounting seat is fixed at a preset mounting position of the mining equipment. The intrinsically safe protective housing is detachably mounted on the mounting seat via the fixing piece.

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