Bus-mounted equipment signal detection device

Abstract

The utility model relates to the technical field of signal detection, in particular to a signal detection device for bus-mounted equipment, which is characterized in that a circuit board main body is arranged in the middle of the interior of a mounting plate, and a protection assembly is arranged at the upper end of the circuit board main body; the protection assembly comprises a protection cover, a fixing block is arranged at the upper end of the protection cover, and the fixing block penetrates through the upper end of the protection cover. According to the signal detection device for the bus-mounted equipment, the on-off state of the circuit board main body is displayed through the LED lamp, the practicability of the device is improved, and meanwhile, the liquid crystal display circuit, the data storage circuit, the RS232 circuit and the RS485 circuit are directly configured on the circuit board main body; the situation that most of elements are damaged due to the fact that original complex connecting elements are not beneficial to circuit control can be avoided, and meanwhile the situation of short circuit can also be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of signal detection, in particular to a signal detection device for equipment on a bus. Background Art

[0002] With the rapid development of electronic products, more requirements are put forward for control devices. The signal transmission of bus-mounted equipment is no longer a simple one-way 232 or one-way 485 transmission method. Among them, the Chinese utility model patent publication number is CN207753802U, which discloses an intelligent bus-mounted device, which has solved the technical problems of high power consumption, waste of central processor resources, and traffic waste that are not conducive to the intensive management of the system in the prior art. The Chinese utility model patent publication number is CN209381934U, which discloses an intelligent vehicle-mounted device and system, which, through a specific technical structure setting, effectively solves the accuracy and effectiveness of driving vehicle safety supervision, and the use of dual MCUs can effectively reduce the power consumption of the equipment.

[0003] However, when a bus-mounted equipment signal detection device with a similar structure was actually used, it was found that its design still had many defects. For example, during use, it was easy to burn chips and accessories due to unstable voltage; during use, it was found that the original design was too complicated, resulting in a waste of resources; during use, it was found that the 232 and 485 signal lines were prone to hidden faults. Because hidden faults are not easy to be detected, there is an urgent need for a new bus-mounted equipment signal detection device. Utility Model Content

[0004] The purpose of the utility model is to provide a bus-mounted equipment signal detection device to solve the problems raised in the above background technology.

[0005] The technical solution of the utility model is: a bus-mounted equipment signal detection device, comprising a mounting plate and a protection component, wherein a circuit board body is arranged in the middle of the mounting plate, and the protection component is arranged at the upper end of the circuit board body;

[0006] The protection assembly includes a protection cover, a fixing block is arranged at the upper end of the protection cover, and the fixing block penetrates the upper end of the protection cover, and the protection cover is movably arranged at the upper end of the circuit board body through the side plate, and the side plate is symmetrically arranged on the upper end side of the mounting plate, and the end of the circuit board body is fixed to the upper end of the mounting plate through a screw rod and a nut, and the screw rod is arranged at the upper end of the support seat, and the outer side of the screw rod is sleeved with an insulating gasket, and the support seat is arranged at the upper end of the mounting plate;

[0007] A ventilation groove is arranged at the lower end of the fixed block, and the ventilation groove is arranged at the upper end of the circuit board body. At the same time, a dustproof net is arranged inside the ventilation groove, and a protective cover is arranged at the upper end of the dustproof net through a fixing bolt, and a LCD screen is arranged inside the protective cover, and a LCD screen protective cover is arranged at the lower end of the LCD screen, and the interior of the LCD screen protective cover is filled with LCD screen protective cotton.

[0008] Furthermore, a spring and a support plate are provided at the lower middle end of the circuit board body, and the spring and the support plate are both provided at the upper middle end of the mounting plate. The support plate is provided at the upper end of the spring, and a sponge pad is provided at the upper end of the support plate. The upper surface of the sponge pad is in contact with the lower surface of the circuit board body, and the surface of the sponge pad is provided with anti-slip grooves.

[0009] Furthermore, the circuit board body includes an MCU controller, which is electrically connected to an external power supply through an LDO circuit and a DC-DC power conversion circuit. At the same time, the MCU controller is electrically connected to a liquid crystal display circuit, a data storage circuit, an RS232 circuit and an RS485 circuit.

[0010] Furthermore, a 24V power supply socket, an LCD screen, a power supply signal output socket and a signal input and output socket are provided on the upper side of the circuit board body, and a detection line connection port is provided at the lower end of the 24V power supply socket, and the detection line connection port is provided on the side of the mounting plate. At the same time, the 24V power supply socket is electrically connected to an external power supply and a DC-DC power conversion circuit, and the detection line connection port, the LCD screen, the power supply signal output socket and the signal input and output socket are all electrically connected to the MCU controller.

[0011] Furthermore, the DC-DC power conversion circuit includes a chip U5, the VIN port of the chip U5 is electrically connected to the 24V power port, the resistor R35, the capacitor C30, the capacitor C31 and the cathode of the diode D10, the EN port of the chip U5 is electrically connected to the resistor R35 and the resistor R37, the COMP port of the chip U5 is electrically connected to the capacitor C34 and the resistor R39, and the resistor R39 is electrically connected to the capacitor C35, the SS port of the chip U5 is electrically connected to the capacitor C36, and the BOOT port of the chip U5 is electrically connected to the capacitor C29, and the capacitor C29 is electrically connected to the cathode of the diode D7, the PH port of the chip U5 is electrically connected to the inductor L3, and the inductor L3 is electrically connected to the cathode of the diode D7 and the cathode of the resistor R36, capacitor C15, capacitor C16, capacitor C17 and diode D9, the capacitor C15, capacitor C16, capacitor C17 and diode D9 are connected in parallel with each other and electrically connected to the 5V power supply port, and the resistor R36 is electrically connected to the resistor R38, and the resistor R38 is electrically connected to the resistor R40 and the VSENSE port of the chip U5.

[0012] Furthermore, the LDO circuit includes a light emitting diode D11, a cathode of the light emitting diode D11 is grounded, and an anode of the light emitting diode D11 is electrically connected to a 5V power port via a resistor R8.

[0013] Furthermore, the liquid crystal display circuit includes a chip P5, a port 2 of the chip P5 is electrically connected to a TFT-VDD power supply voltage input port, and a port 1 of the chip P5 is grounded.

[0014] Furthermore, the data storage circuit includes a chip U5, a VCC port of the chip U5 is electrically connected to a capacitor C23, a resistor R16 and a 3.3V power port, the resistor R16 is electrically connected to a / RESET port of the chip U5, a / WP port of the chip U5 is electrically connected to a resistor R20, the resistor R20 is electrically connected to a 3.3V power port, and the capacitor C23 and the GND port of the chip U5 are both grounded.

[0015] Furthermore, the RS232 circuit includes a chip U2, the C1+ port of the chip U2 is electrically connected to the C1- port of the chip U2 through a capacitor C1, the C2+ port of the chip U2 is electrically connected to the C2- port of the chip U2 through a capacitor C10, the V+ port of the chip U2 is electrically connected to the V- port of the chip U2 through a capacitor C11 and a capacitor C12, the VCC port of the chip U2 is electrically connected to a 5V power supply port and a capacitor C13, the T1OUT port of the chip U2 is electrically connected to a T1OUT signal output port, the R1IN port of the chip U2 is electrically connected to a R1IN signal input port, the R1OUT port of the chip U2 is electrically connected to a R1OUT signal output port through a resistor R3, the T1IN port of the chip U2 is electrically connected to a T1IN signal input port through a resistor R7, and the GND port of the chip U2 and capacitors C11, C12, and C13 are all grounded.

[0016] Furthermore, the RS485 circuit includes a chip U3, the RE port of the chip U3 is electrically connected to a resistor R27, the collector of a transistor Q2 and a DE port of the chip U3, the base of the transistor Q2 is electrically connected to a resistor R25 and a resistor R26, the resistor R25 and the DI port of the chip U3 are electrically connected to an R1OUT signal output port, the resistor R26 is electrically connected to an emitter of the transistor Q2, the RO port of the chip U3 is electrically connected to a T1IN signal input port, the VCC port of the chip U3 is electrically connected to a capacitor C14, and the A port of the chip U3 is electrically connected to a A The port is electrically connected to resistor R12 and resistor R13, wherein the resistor R12 is electrically connected to resistor R11, COM-A3 communication port and port 2 of rectifier bridge D8, and the resistor R13 is electrically connected to resistor R14 and B of chip U3. B Port, the resistor R14 is electrically connected to the resistor R15 and the port 1 of the rectifier bridge D8, and the VCC port of the chip U3, the resistor R11, and the resistor R27 are electrically connected to the 5V power supply port, and the emitter of the transistor Q2, the resistor R15, the resistor R26, the capacitor C14, the port 3 of the rectifier bridge D8 and the GND port of the chip U3 are all grounded.

[0017] The utility model provides a bus-mounted equipment signal detection device through improvement, which has the following improvements and advantages compared with the prior art:

[0018] The bus-mounted equipment signal detection device of the utility model displays the switch state of the circuit board body by an LED lamp, thereby improving the practicability of the device. Meanwhile, a liquid crystal display circuit, a data storage circuit, an RS232 circuit and an RS485 circuit are directly configured on the circuit board body, which can not only avoid the situation that the original complex connection elements are not conducive to the control circuit and cause damage to most components, but also avoid the short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further explained below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 It is a schematic diagram of a top view of a cross-sectional structure of a signal detection device for bus-mounted equipment of the utility model;

[0021] Figure 2 It is a side cross-sectional structural schematic diagram of the bus-mounted equipment signal detection device of the utility model;

[0022] Figure 3 It is a partial side cross-sectional structural schematic diagram of the fixing block of the utility model;

[0023] Figure 4 This is a front view structural diagram of the protective cover of the utility model;

[0024] Figure 5 It is a partial top view structural schematic diagram of the mounting plate of the utility model;

[0025] Figure 6 This is a working block diagram of the main body of the circuit board of the utility model;

[0026] Figure 7 The circuit diagram of the DC-DC power conversion circuit of the utility model;

[0027] Figure 8 This is a circuit diagram of the LDO circuit of the utility model;

[0028] Fig. 9 It is a circuit diagram of the liquid crystal display circuit of the utility model;

[0029] Fig.10 A circuit diagram of a data storage circuit of the utility model;

[0030] Fig.11 The circuit diagram of the RS232 circuit of the utility model;

[0031] Fig.12 It is the circuit diagram of the RS485 circuit of the utility model;

[0032] Description of reference numerals:

[0033] 1. Mounting plate; 101. Circuit board body; 2. Protection assembly; 201. Side panel; 202. Protection cover; 203. Support seat; 204. Screw rod; 205. Insulation gasket; 206. Nut; 207. Spring; 208. Support plate; 209. Sponge pad; 3. Fixing block; 301. Ventilation slot; 302. LCD screen; 303. Fixing bolt; 304. Dustproof net; 305. Protection cover; 4. 24V power supply seat; 5. LCD screen protection cover; 6. Detection line connection port; 7. LCD screen and power supply signal output socket; 8. Signal input and output socket. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that, in the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0036] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0037] It should be noted that like reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not require further detailed discussion and description in the description of the subsequent drawings.

[0038] refer to Figure 1-5, this embodiment provides a bus-mounted device signal detection device, which includes a mounting plate 1, a protective component 2, a fixing block 3, a 24V power supply socket 4, a liquid crystal screen protective cover 5, a detection line connection port 6, a liquid crystal screen and power supply signal output socket 7 and a signal input and output socket 8. A circuit board body 101 is arranged in the middle of the mounting plate 1, the protective component 2 is arranged at the upper end of the circuit board body 101, the fixing block 3 is arranged at the upper end of the protective component 2, and the fixing block 3 passes through the upper end of the protective component 2. Further, the 24V power supply socket 4, the liquid crystal screen and power supply signal output socket 7 and the signal input and output socket 8 are all arranged on the upper side of the circuit board body 101. A detection line connection port 6 is arranged at the lower end of the 24V power supply socket 4, and the detection line connection port 6 is arranged on the side of the mounting plate 1. At the same time, the 24V power supply socket 4 is electrically connected to an external power supply and a DC-DC power conversion circuit, and the detection line connection port 6, the liquid crystal screen and power supply signal output socket 7 and the signal input and output socket 8 are all electrically connected to the MCU controller. It is worth noting that the DC-DC power conversion circuit and the MCU controller are both arranged on the circuit board body 101 .

[0039] In this embodiment, the protection assembly 2 includes a protection cover 202, a fixing block 3 is provided at the upper end of the protection cover 202, and the fixing block 3 penetrates the upper end of the protection cover 202, and the protection cover 202 is movably provided at the upper end of the circuit board body 101 through the side plate 201. The side plate 201 is symmetrically provided at the upper end side of the mounting plate 1, and the end of the circuit board body 101 is fixed to the upper end of the mounting plate 1 through a screw rod 204 and a nut 206, the screw rod 204 is provided at the upper end of the support seat 203, and the outer side of the screw rod 204 is provided with an insulating gasket 205, and the support seat 203 is provided at the upper end of the mounting plate 1. Furthermore, a spring 207 and a support plate 208 are provided at the lower middle end of the circuit board body 101, and both the spring 207 and the support plate 208 are provided at the upper middle end of the mounting plate 1. Meanwhile, the support plate 208 is provided at the upper end of the spring 207, and a sponge pad 209 is provided at the upper end of the support plate 208. The upper surface of the sponge pad 209 is in contact with the lower surface of the circuit board body 101, and the surface of the sponge pad 209 is provided with anti-slip grooves.

[0040] That is to say, after the screw rod 204 passes through the four openings of the circuit board body 101, it is installed on the top of the support seat 203, and then the insulating gasket 205 is sleeved on the outside of the screw rod 204 and located on the top of the circuit board body 101, and then the nut 206 is rotated and installed on the top of the screw rod 204, so that the circuit board body 101 is fixedly installed on the top of the support seat 203. The insulating gasket 205 can prevent the metal conductivity of the nut 206 from affecting the normal operation of the circuit, and the elastic force of the spring 207 will act on the support plate 208, so that the support plate 208 can play a role in shock absorption and support for the circuit board body 101, thereby preventing the bus from being damaged by the large vibration during driving. At the same time, the sponge pad 209 contacts the bottom of the circuit board body 101, so that the wear of the contact surface during the shock absorption process is minimized.

[0041] In this embodiment, the lower end of the fixed block 3 is provided with a ventilation slot 301, and the ventilation slot 301 is provided at the upper end of the circuit board body 101. At the same time, a dustproof net 304 is provided inside the ventilation slot 301. The upper end of the dustproof net 304 is provided with a protective cover 305 through a fixing bolt 303. The protective cover 305 is provided with a liquid crystal screen 302 inside. The lower end of the liquid crystal screen 302 is provided with a liquid crystal screen protective cover 5, and the inside of the liquid crystal screen protective cover 5 is filled with liquid crystal screen protective cotton. Specifically, the liquid crystal screen 302 is fixedly installed inside the fixed block 3 through the screw 303 and the liquid crystal screen protective cover 5, so that the liquid crystal screen 302 can be better connected to the liquid crystal screen and the power supply signal output socket 7 through the cable. At the same time, the circuit board body 101 can be cooled by the ventilation slot 301, and the inside of the protective cover 202 can be dustproofed by the dustproof net 304, so that dust accumulation can be avoided and the heat dissipation of the electronic components on the surface of the circuit board body 101 can be avoided.

[0042] refer to Figure 6-12, the circuit board body 101 includes an MCU controller, wherein the MCU controller is electrically connected to an external power supply through an LDO circuit and a DC-DC power conversion circuit, and the MCU controller is electrically connected to a liquid crystal display circuit, a data storage circuit, an RS232 circuit, and an RS485 circuit. Further, the upper side of the circuit board body 101 is provided with a 24V power supply socket 4, a liquid crystal screen and a power supply signal output socket 7, and a signal input and output socket 8, and the lower end of the 24V power supply socket 4 is provided with a detection line connection port 6, and the detection line connection port 6 is arranged on the side of the mounting plate 1, and the 24V power supply socket 4 is electrically connected to an external power supply and a DC-DC power conversion circuit, and the detection line connection port 6, the liquid crystal screen and the power supply signal output socket 7, and the signal input and output socket 8 are all electrically connected to the MCU controller. Specifically, the circuit board body 101 can be provided with a system power supply by an external power supply or a built-in lithium-ion battery, wherein the DC-DC power conversion circuit can realize the voltage conversion of the system power supply from 24v->5v->3.3V, and transmit the converted voltage to each functional unit to power each functional unit. It is worth noting that when the system power is provided by the built-in lithium-ion battery, an additional overcurrent protection circuit needs to be configured to protect the system power. The overcurrent protection circuit here is a conventional circuit, so it will not be specifically described in this embodiment. Further, the circuit board body 101 includes RS485 / RS232 communication detection function, data storage function and liquid crystal display function. The circuit board body 101 can detect the communication status of the external bus through the RS232 circuit and the RS485 circuit, and the MCU controller can analyze and store the collected data, and display the status of the bus data communication through the LCD screen for the operator to view.

[0043] In this embodiment, the DC-DC power conversion circuit includes a chip U5, the VIN port of the chip U5 is electrically connected to the 24V power port, the resistor R35, the capacitor C30, the capacitor C31 and the cathode of the diode D10, the EN port of the chip U5 is electrically connected to the resistor R35 and the resistor R37, the COMP port of the chip U5 is electrically connected to the capacitor C34 and the resistor R39, and the resistor R39 is electrically connected to the capacitor C35, the SS port of the chip U5 is electrically connected to the capacitor C36, and the BOOT port of the chip U5 is electrically connected to the capacitor C29, and capacitor C29 is electrically connected to the cathode of diode D7, the PH port of chip U5 is electrically connected to inductor L3, and at the same time inductor L3 is electrically connected to the cathode of diode D7 and resistor R36, capacitor C15, capacitor C16, capacitor C17 and the cathode of diode D9, capacitor C15, capacitor C16, capacitor C17 and diode D9 are connected in parallel with each other and electrically connected to the 5V power supply port, and resistor R36 is electrically connected to resistor R38, and resistor R38 is electrically connected to resistor R40 and the VSENSE port of chip U5.

[0044] In this embodiment, the LDO circuit includes a light emitting diode D11 , a cathode of the light emitting diode D11 is grounded, and an anode of the light emitting diode D11 is electrically connected to a 5V power port via a resistor R8 .

[0045] In this embodiment, the liquid crystal display circuit includes a chip P5, a port 2 of the chip P5 is electrically connected to a TFT-VDD power supply voltage input port, and a port 1 of the chip P5 is grounded.

[0046] In this embodiment, the data storage circuit includes a chip U5, the VCC port of the chip U5 is electrically connected to the capacitor C23, the resistor R16 and the 3.3V power supply port, the resistor R16 is electrically connected to the / RESET port of the chip U5, the / WP port of the chip U5 is electrically connected to the resistor R20, the resistor R20 is electrically connected to the 3.3V power supply port, and the capacitor C23 and the GND port of the chip U5 are both grounded.

[0047] In this embodiment, the RS232 circuit includes a chip U2, a C1+ port of the chip U2 is electrically connected to a C1- port of the chip U2 through a capacitor C1, a C2+ port of the chip U2 is electrically connected to a C2- port of the chip U2 through a capacitor C10, a V+ port of the chip U2 is electrically connected to a V- port of the chip U2 through a capacitor C11 and a capacitor C12, a VCC port of the chip U2 is electrically connected to a 5V power supply port and a capacitor C13, a T1OUT port of the chip U2 is electrically connected to a T1OUT signal output port, a R1IN port of the chip U2 is electrically connected to a R1IN signal input port, a R1OUT port of the chip U2 is electrically connected to a R1OUT signal output port through a resistor R3, a T1IN port of the chip U2 is electrically connected to a T1IN signal input port through a resistor R7, and a GND port of the chip U2 and capacitors C11, C12, and C13 are all grounded.

[0048] In this embodiment, the RS485 circuit includes a chip U3, the RE port of the chip U3 is electrically connected to the resistor R27, the collector of the transistor Q2 and the DE port of the chip U3, the base of the transistor Q2 is electrically connected to the resistor R25 and the resistor R26, the resistor R25 and the DI port of the chip U3 are electrically connected to the R1OUT signal output port, the resistor R26 is electrically connected to the emitter of the transistor Q2, the RO port of the chip U3 is electrically connected to the T1IN signal input port, the VCC port of the chip U3 is electrically connected to the capacitor C14, and the A port of the chip U3 is electrically connected to the R1OUT signal output port. A The port is electrically connected to resistor R12 and resistor R13, resistor R12 is electrically connected to resistor R11, COM-A3 communication port and port 2 of rectifier bridge D8, resistor R13 is electrically connected to resistor R14 and chip U3 B BPort, resistor R14 is electrically connected to resistor R15 and port 1 of rectifier bridge D8, while the VCC port of chip U3, resistor R11, and resistor R27 are electrically connected to the 5V power supply port, and the emitter of transistor Q2, resistor R15, resistor R26, capacitor C14, port 3 of rectifier bridge D8 and the GND port of chip U3 are all grounded.

[0049] Specifically, the signal input and output socket 8 is connected to the RS232 circuit and the RS485 circuit, and the 24V power supply socket 4 is connected to the external power supply. It is worth noting that a lithium battery pack is provided at the rear end of the mounting plate 1, wherein the negative electrode of the lithium battery pack is connected to the common ground wire, and the positive electrode is connected in series to the power supply electrode of the 5V power chip to supply power to the 5V power chip. In other words, when the bus-mounted equipment signal detection device in this embodiment is running with the vehicle, it can be powered by the 24V power supply port or by the lithium battery pack, so that the bus-mounted equipment signal detection device in this embodiment can be used both independently and with the vehicle.

[0050] Furthermore, when a fault is found in the RS232 circuit and the RS485 circuit, the fault code is reported through the fault judgment light emitting diode D11, that is, it flashes to remind the staff so that the staff can deal with it in time. At the same time, the fault code will be transmitted to the data storage circuit for storage for standby adjustment. At the same time, the LCD screen 302 on the top of the equipment will also display the fault code for maintenance personnel to view and handle.

[0051] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bus-mounted equipment signal detection device, characterized in that: It comprises a mounting plate (1) and a protection component (2), wherein a circuit board body (101) is arranged in the middle of the mounting plate (1), and the protection component (2) is arranged at the upper end of the circuit board body (101); The protective assembly (2) comprises a protective cover (202), a fixing block (3) is arranged at the upper end of the protective cover (202), and the fixing block (3) passes through the upper end of the protective cover (202), and the protective cover (202) is movably arranged on the upper end of the circuit board body (101) through the side plate (201), and the side plate (201) is symmetrically arranged on the upper side of the mounting plate (1), and the end of the circuit board body (101) is fixed to the upper end of the mounting plate (1) through a screw rod (204) and a nut (206), and the screw rod (204) is arranged on the upper end of the support seat (203), and the outer side of the screw rod (204) is provided with an insulating gasket (205), and the support seat (203) is arranged on the upper end of the mounting plate (1); A ventilation slot (301) is provided at the lower end of the fixing block (3), and the ventilation slot (301) is provided at the upper end of the circuit board body (101). A dustproof net (304) is provided inside the ventilation slot (301), and a protective cover (305) is provided at the upper end of the dustproof net (304) via a fixing bolt (303). A liquid crystal screen (302) is provided inside the protective cover (305), and a liquid crystal screen protective cover (5) is provided at the lower end of the liquid crystal screen (302), and the interior of the liquid crystal screen protective cover (5) is filled with liquid crystal screen protective cotton.

2. A bus-mounted equipment signal detection device according to claim 1, characterized in that: A spring (207) and a support plate (208) are arranged at the middle lower end of the circuit board body (101); the spring (207) and the support plate (208) are both arranged at the middle upper end of the mounting plate (1); the support plate (208) is arranged at the upper end of the spring (207); and a sponge pad (209) is arranged at the upper end of the support plate (208); the upper surface of the sponge pad (209) is in contact with the lower surface of the circuit board body (101); and the surface of the sponge pad (209) is provided with anti-slip grooves.

3. A bus-mounted equipment signal detection device according to claim 1 or 2, characterized in that: The circuit board body (101) comprises an MCU controller, the MCU controller is electrically connected to an external power supply via an LDO circuit and a DC-DC power conversion circuit, and the MCU controller is electrically connected to a liquid crystal display circuit, a data storage circuit, an RS232 circuit and an RS485 circuit.

4. A bus-mounted equipment signal detection device according to claim 3, characterized in that: A 24V power supply socket (4), a liquid crystal screen and a power supply signal output socket (7) and a signal input and output socket (8) are arranged on the upper side of the circuit board body (101); a detection line connection port (6) is arranged on the lower end of the 24V power supply socket (4); the detection line connection port (6) is arranged on the side of the mounting plate (1); and the 24V power supply socket (4) is electrically connected to an external power supply and a DC-DC power conversion circuit; and the detection line connection port (6), the liquid crystal screen and the power supply signal output socket (7) and the signal input and output socket (8) are all electrically connected to an MCU controller.

5. A bus-mounted equipment signal detection device according to claim 3, characterized in that: The DC-DC power conversion circuit includes a chip U5, a VIN port of the chip U5 is electrically connected to a 24V power port, a resistor R35, a capacitor C30, a capacitor C31 and a cathode of a diode D10, an EN port of the chip U5 is electrically connected to resistors R35 and R37, a COMP port of the chip U5 is electrically connected to capacitors C34 and R39, and resistor R39 is electrically connected to capacitor C35, an SS port of the chip U5 is electrically connected to capacitor C36, and a BOOT port of the chip U5 is electrically connected to capacitor C29. The capacitor C29 is electrically connected to the cathode of the diode D7, the PH port of the chip U5 is electrically connected to the inductor L3, and the inductor L3 is electrically connected to the cathode of the diode D7 and the cathode of the resistor R36, capacitor C15, capacitor C16, capacitor C17 and diode D9. The capacitors C15, capacitor C16, capacitor C17 and diode D9 are connected in parallel to each other and electrically connected to the 5V power supply port. The resistor R36 is electrically connected to the resistor R38, and the resistor R38 is electrically connected to the resistor R40 and the VSENSE port of the chip U5.

6. A bus-mounted equipment signal detection device according to claim 3, characterized in that: The LDO circuit includes a light emitting diode D11 , a cathode of the light emitting diode D11 is grounded, and an anode of the light emitting diode D11 is electrically connected to a 5V power supply port via a resistor R8 .

7. A bus-mounted equipment signal detection device according to claim 3, characterized in that: The liquid crystal display circuit includes a chip P5, a port 2 of the chip P5 is electrically connected to a TFT-VDD power supply voltage input port, and a port 1 of the chip P5 is grounded.

8. The bus-mounted equipment signal detection device according to claim 3, characterized in that: The data storage circuit includes a chip U5, a VCC port of the chip U5 is electrically connected to a capacitor C23, a resistor R16 and a 3.3V power port, the resistor R16 is electrically connected to a / RESET port of the chip U5, a / WP port of the chip U5 is electrically connected to a resistor R20, the resistor R20 is electrically connected to a 3.3V power port, and the capacitor C23 and the GND port of the chip U5 are both grounded.

9. The bus-mounted equipment signal detection device according to claim 3, characterized in that: The RS232 circuit includes a chip U2, wherein the C1+ port of the chip U2 is electrically connected to the C1- port of the chip U2 through a capacitor C1, the C2+ port of the chip U2 is electrically connected to the C2- port of the chip U2 through a capacitor C10, the V+ port of the chip U2 is electrically connected to the V- port of the chip U2 through a capacitor C11 and a capacitor C12, the VCC port of the chip U2 is electrically connected to a 5V power supply port and a capacitor C13, the T1OUT port of the chip U2 is electrically connected to a T1OUT signal output port, the R1IN port of the chip U2 is electrically connected to a R1IN signal input port, the R1OUT port of the chip U2 is electrically connected to a R1OUT signal output port through a resistor R3, the T1IN port of the chip U2 is electrically connected to a T1IN signal input port through a resistor R7, and the GND port of the chip U2 and capacitors C11, C12, and C13 are all grounded.

10. The bus-mounted equipment signal detection device according to claim 3, characterized in that: The RS485 circuit includes a chip U3, wherein the RE port of the chip U3 is electrically connected to a resistor R27, the collector of a transistor Q2 and a DE port of the chip U3, the base of the transistor Q2 is electrically connected to a resistor R25 and a resistor R26, the resistor R25 and a DI port of the chip U3 are electrically connected to a R1OUT signal output port, the resistor R26 is electrically connected to an emitter of the transistor Q2, the RO port of the chip U3 is electrically connected to a T1IN signal input port, the VCC port of the chip U3 is electrically connected to a capacitor C14, and the AA port of the chip U3 is electrically connected to a The resistor R12 and the resistor R13 are electrically connected, the resistor R12 is electrically connected to the resistor R11, the COM-A3 communication port and the port 2 of the rectifier bridge D8, the resistor R13 is electrically connected to the resistor R14 and the BB port of the chip U3, the resistor R14 is electrically connected to the resistor R15 and the port 1 of the rectifier bridge D8, and at the same time, the VCC port of the chip U3, the resistor R11, and the resistor R27 are electrically connected to the 5V power supply port, and the emitter of the transistor Q2, the resistor R15, the resistor R26, the capacitor C14, the port 3 of the rectifier bridge D8 and the GND port of the chip U3 are all grounded.

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