CN210689867U - Temperature sensing cable detection device - Google Patents
Temperature sensing cable detection device Download PDFInfo
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- CN210689867U CN210689867U CN201921422396.3U CN201921422396U CN210689867U CN 210689867 U CN210689867 U CN 210689867U CN 201921422396 U CN201921422396 U CN 201921422396U CN 210689867 U CN210689867 U CN 210689867U
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Abstract
The utility model discloses a temperature sensing cable detection device, including examining test table, heating mechanism, mounting platform and detection module, mounting platform includes mounting panel, hydraulic stem and guide bar, heating mechanism includes heat conduction box and electric heating pipe, be provided with temperature sensor in the heat conduction box, set up inclination sensor on the mounting panel, controlling means includes control box, display screen and pilot lamp to and the electronic circuit board, integrated microcontroller, temperature sensing cable detection circuitry and communication module on the electronic circuit board, microcontroller's output termination has relay module. The utility model has the advantages of simple structure and reasonable design and use easy and simple to handle, realize the detection of the warning temperature value of temperature sensing cable, can accomplish the detection of temperature sensing cable portably, fast, improved detection efficiency.
Description
Technical Field
The utility model belongs to the technical field of the temperature sensing cable detects, especially, relate to a temperature sensing cable detection device.
Background
The temperature sensing cable, also known as a linear temperature sensing fire detector, has the ability of continuously monitoring the temperature of a protected object along the whole linear length. The temperature-sensing cable detector can be used in places such as tunnels, interlayers and conveyor belts, is stable and reliable, and is suitable for fire detection in severe environments. The cable is widely applied to places such as power stations, transformer substations, oil depots, cable channels, cable interlayers and belt conveying devices. However, before the temperature sensing cable is installed, the temperature sensing cable needs to be tested, and currently, the detection of the temperature sensing cable is generally to heat the lighter at the end of the temperature sensing cable or to test the end of the temperature sensing cable with hot water in a hot water bottle. In addition, the alarm temperature value of the temperature sensing cable cannot be accurately obtained. Therefore, a temperature sensing cable detection device with simple structure, reasonable design and high accuracy is lacking at present, the detection of the alarm temperature value of the temperature sensing cable is realized, and the detection efficiency is improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that not enough among the above-mentioned prior art is directed at, provide a temperature sensing cable detection device, its simple structure, reasonable in design and use easy and simple to handle realize the detection of the warning temperature value of temperature sensing cable, can accomplish the detection of temperature sensing cable portably, fast, improved detection efficiency.
In order to solve the technical problem, the utility model discloses a technical scheme is: a temperature sensing cable detection device is characterized in that: the temperature-sensing cable detection device comprises a detection table, a heating mechanism, an installation platform and a detection module, wherein the heating mechanism is installed on the detection table, the installation platform is installed on the detection table and used for installing a temperature-sensing cable, and the detection module is installed on the detection table;
the detection module comprises a control box, a display screen and an indicator light which are arranged on the control box, and an electronic circuit board which is arranged in the control box, wherein a microcontroller, a temperature sensing cable detection circuit and a communication module which is connected with the microcontroller are integrated on the electronic circuit board, the output end of the microcontroller is connected with a relay module which is used for controlling the power-on and power-off of an electric heating tube, the inclination angle sensor is connected with the microcontroller through the communication module, and the output end of the temperature sensor is connected with the input end of the microcontroller.
The temperature-sensitive cable detection device is characterized in that: the detecting table is provided with an L-shaped connecting piece for installing the heat conducting box body, the L-shaped connecting piece comprises a vertical plate and a horizontal plate, the vertical plate is installed on the detecting table, the horizontal plate is vertically arranged with the vertical plate, the bottom of the horizontal plate is parallel to the top surface of the detecting table, and the bottom of the horizontal plate is fixedly connected with the top surface of the heat conducting box body.
The temperature-sensitive cable detection device is characterized in that: be provided with first retaining member and second retaining member on the guide bar, just the bottom surface of first retaining member and the top surface of mounting panel laminate mutually, the bottom surface of mounting panel laminates mutually with the top side of second retaining member.
The temperature-sensitive cable detection device is characterized in that: the control box is provided with a plug for accessing 220V of mains supply, the electronic circuit board is integrated with a power module, the power module comprises a transformer T1, a chip LM7812 and a chip LM7805, one end of a primary coil of the transformer T1 is connected with one end of the primary coil which is accessed into the 220V of mains supply through the plug, the other end of the primary coil of the transformer T1 is connected with the other end of the primary coil which is accessed into the 220V of mains supply through the plug, two alternating current input ends of a rectifier bridge D1 are respectively connected with two ends of a secondary coil of the transformer T1, a Vin pin of the chip LM7812 is divided into two paths, one path is connected with a positive direct current output end of the rectifier bridge D1, and the other path is grounded; the negative direct current output end of the rectifier bridge D1 is grounded with a GND pin of the chip LM7812, a Vout pin of the chip LM7812 is divided into two paths, one path is grounded through a capacitor C2, and the other path is a 12V power supply output end; the Vin pin of the chip LM7805 is divided into two paths, one path is connected with the 12V power output end, the other path is grounded through a capacitor C4, the Vout pin of the chip LM7805 is divided into two paths, the other path is grounded through a capacitor C5, the other path is the 5V power output end, and the GND pin of the chip LM7805 is grounded.
The temperature-sensitive cable detection device is characterized in that: the relay module comprises a relay K1 and a triode Q1, one end of a coil of the relay K1 is divided into two paths, one path is connected with the anode of a diode D2, and the other path is grounded; the other end of the coil of the relay K1 is divided into two paths, one path is connected with the cathode of a diode D2, and the other path is connected with the collector of a triode Q1; the emitting electrode of the triode Q1 is connected with the 5V power output end, the base electrode of the triode Q1 is connected with the microcontroller through the resistor R4, the common contact of the relay K1 is connected with the live wire end of the electric heating pipe, the normally open contact of the relay K1 is connected with the live wire end of the access commercial power 220V, the normally closed contact of the relay K1 is suspended, and the zero wire end of the electric heating pipe is connected with the zero wire end of the access commercial power 220V.
The temperature-sensitive cable detection device is characterized in that: the temperature sensor is a DS18B20 temperature sensor, the grounding end of the DS18B20 temperature sensor is grounded, the power supply end of the DS18B20 temperature sensor is connected with the 5V power supply output end, and the 2 nd pin of the DS18B20 temperature sensor is connected with the microcontroller.
The temperature-sensitive cable detection device is characterized in that: the communication module is a MAX232 communication module.
The temperature-sensitive cable detection device is characterized in that: the control box is provided with a first joint, a second joint, a third joint and a fourth joint which are used for connecting a temperature sensing cable, the temperature sensing cable comprises a first cable, a second cable and a protective sleeve sleeved outside the first cable and the second cable, two ends of the first cable are respectively connected to the first joint and the second joint, and two ends of the second cable are respectively connected to the third joint and the fourth joint;
the temperature sensing cable detection circuit comprises an operational amplifier U5A with the model of LM324 and an operational amplifier U5B with the model of LM324, an indicator light is a light emitting diode D3, one end of a first cable is connected with one end of a resistor R13, one end of a second cable is connected with the other end of the resistor R13, the other end of the second cable is grounded, the non-inverting input end of the operational amplifier U5A is divided into two paths, one path is connected with the other end of the first cable, and the other path is connected with a 5V power output end through a resistor R9; the inverting input end of the operational amplifier U5A is grounded through a resistor R8, the output end of the operational amplifier U5A is divided into two paths, one path is connected with the inverting input end of the operational amplifier U5A through a resistor R6, and the other path is connected with the inverting input end of the operational amplifier U5B; the positive phase input end of the operational amplifier U5B is divided into two paths, one path is grounded through a resistor R16, the other path is connected with the 5V power supply output end through a resistor R11, the output end of the operational amplifier U5B is connected with one end of a resistor R20, the other end of the resistor R20 is divided into two paths, one path is connected with the base electrode of a triode Q2 through a resistor R10, and the other path is connected with the cathode of a voltage regulator tube Dz; the collector of the triode Q2 is connected with the cathode of the light emitting diode D4, the anode of the light emitting diode D3 is connected with the 5V power output end through the resistor R7, and the anode of the voltage regulator tube Dz is grounded.
Compared with the prior art, the utility model has the following advantage:
1. the adopted detection device has simple structure, reasonable design and simple and convenient operation.
2. The adopted detection device comprises an installation platform and a heating mechanism, and a detector only needs to clamp the temperature sensing cable on the installation platform and is heated by the heating mechanism, so that the alarm temperature value of the temperature sensing cable is tested, and the detection efficiency is improved.
3. The adopted mounting platform comprises a mounting plate, a hydraulic rod and a guide rod, firstly, a second groove arranged at the top of the mounting plate and a first groove at the bottom of the heat conduction box body are enclosed to form a mounting groove for accommodating the temperature sensing cable, so that the situation that the temperature sensing cable is directly clamped by the mounting plate and the plane of the heat conduction box body to cause extrusion damage of the temperature sensing cable is avoided; secondly, the hydraulic rod is arranged, so that the distance between the top of the mounting plate and the bottom of the heat conducting box body is adjusted through the lifting of the hydraulic rod, the distance between the second groove and the first groove is realized, temperature sensing cables with different diameters can be accommodated, and the application range is improved; and thirdly, a guide rod is arranged, so that the mounting plate is driven to vertically move up and down along the guide rod in the lifting process of the hydraulic rod, and the extrusion damage of the temperature sensing cable caused by the inclination of the mounting plate is avoided through the guide to the four corners of the mounting plate.
4. The heating mechanism that adopts includes heat conduction box and electric heating pipe, and at the in-process of electric heating pipe heating, temperature sensor detects the temperature in the heat conduction box to temperature value in the heat conduction box when acquireing the temperature sensing cable short circuit, thereby acquireing the warning temperature value of temperature sensing cable, improved the degree of accuracy that detects.
5. The temperature sensing cable detection circuit is used for enabling the indicator lamp to be not on when the temperature sensing cable is normal, enabling the indicator lamp to be on when the temperature sensing cable is in short circuit, facilitating accurate detection of alarm temperature values when the temperature sensing cable is in short circuit and enabling the temperature sensing cable to be convenient to use and provide basis for use of the temperature sensing cable.
To sum up, the utility model has the advantages of simple structure and reasonable design and use easy and simple to handle, realize the detection of the warning temperature value of temperature sensing cable, can accomplish the detection of temperature sensing cable portably, fast, improve detection efficiency, and accommodation is wide.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the temperature sensing cable of the present invention.
Fig. 3 is a schematic block diagram of the circuit of the present invention.
Fig. 4 is a schematic circuit diagram of the power module of the present invention.
Fig. 5 is a schematic circuit diagram of the relay module of the present invention.
Fig. 6 is a schematic circuit diagram of the temperature sensor of the present invention.
Fig. 7 is a schematic circuit diagram of the display screen of the present invention.
Fig. 8 is a schematic circuit diagram of the tilt sensor and the communication module of the present invention.
Fig. 9 is a schematic circuit diagram for detecting the temperature sensing cable according to the present invention.
Description of reference numerals:
1-detection table; 2-hydraulic rod; 3-vertical plate;
4-electric heating tube; 5, horizontal plate; 6-temperature sensor;
7-heat conducting box body; 8-a first groove; 9-1 — a first locking member;
9-2-a second locking member; 10-mounting a plate; 11-a guide rod;
12-a second recess; 13-control box; 14-a display screen;
15-a tilt sensor; 17-a plug; 18-a power supply module;
19-a communication module; 20-a microcontroller; 21-a relay module;
22 — a first joint; 23 — a second joint; 24-a third joint;
25-fourth joint; 26-indicator light; 29-temperature sensing cable detection circuit;
30-temperature sensing cable; 30-1-protective sleeve; 30-2 — a first cable;
30-3 — second cable.
Detailed Description
As shown in fig. 1, 2 and 3, a temperature-sensitive cable detection device comprises a detection table 1, a heating mechanism mounted on the detection table 1, a mounting platform mounted on the detection table 1 and used for mounting a temperature-sensitive cable 30, and a detection module mounted on the detection table 1, the mounting platform comprises a mounting plate 10, a hydraulic rod 2 arranged at the center of the bottom of the mounting plate 10 and guide rods 11 arranged around the mounting plate 10, the heating mechanism comprises a heat conduction box body 7 and an electric heating pipe 4 arranged in the heat conduction box body 7, a first groove 8 is arranged at the bottom of the heat conduction box body 7, the mounting plate 10 is provided at the top thereof with a second groove 12, the first groove 8 and the second groove 12 enclose a mounting groove for accommodating the temperature sensing cable 30, a temperature sensor 6 is arranged in the heat conduction box body 7, and an inclination angle sensor 15 is arranged on the mounting plate 10;
the detection module comprises a control box 13, a display screen 14 and an indicator lamp 26 which are arranged on the control box 13, and an electronic circuit board which is arranged in the control box 13, wherein a microcontroller 20, a temperature sensing cable detection circuit 29 and a communication module 19 which is connected with the microcontroller 20 are integrated on the electronic circuit board, the output end of the microcontroller 20 is connected with a relay module 21 which is used for controlling the on-off of the electric heating pipe 4, the inclination angle sensor 15 is connected with the microcontroller 20 through the communication module 19, and the output end of the temperature sensor 6 is connected with the input end of the microcontroller 20.
As shown in fig. 1, in this embodiment, an L-shaped connector for installing the heat conduction box 7 is disposed on the inspection table 1, the L-shaped connector includes a vertical plate 3 installed on the inspection table 1 and a horizontal plate 5 vertically arranged with the vertical plate 3, the bottom of the horizontal plate 5 is parallel to the top surface of the inspection table 1, and the bottom of the horizontal plate 5 is fixedly connected to the top surface of the heat conduction box 7.
In the present embodiment, as shown in fig. 1, the guide bar 11 is provided with a first locking member 9-1 and a second locking member 9-2, and the bottom side of the first locking member 9-1 is attached to the top surface of the mounting plate 10, and the bottom side of the mounting plate 10 is attached to the top side of the second locking member 9-2.
As shown in fig. 4, in this embodiment, a plug 17 for accessing a mains supply 220V is disposed on the control box 13, a power module 18 is integrated on the electronic circuit board, the power module 18 includes a transformer T1, a chip LM7812 and a chip LM7805, one end of a primary coil of the transformer T1 is connected to one end of the transformer T1 which is accessed to the mains supply 220V through the plug 17, the other end of the primary coil of the transformer T1 is connected to the other end of the transformer T220V through the plug 17, two ac input ends of the rectifier bridge D1 are respectively connected to two ends of a secondary coil of the transformer T1, Vin pins of the chip LM7812 are divided into two paths, one path is connected to a positive dc output end of the rectifier bridge D1, and the other path is grounded through a capacitor C3; the negative direct current output end of the rectifier bridge D1 is grounded with a GND pin of the chip LM7812, a Vout pin of the chip LM7812 is divided into two paths, one path is grounded through a capacitor C2, and the other path is a 12V power supply output end; the Vin pin of the chip LM7805 is divided into two paths, one path is connected with the 12V power output end, the other path is grounded through a capacitor C4, the Vout pin of the chip LM7805 is divided into two paths, the other path is grounded through a capacitor C5, the other path is the 5V power output end, and the GND pin of the chip LM7805 is grounded.
As shown in fig. 5, in this embodiment, the relay module 21 includes a relay K1 and a transistor Q1, one end of a coil of the relay K1 is divided into two paths, one path is connected to an anode of a diode D2, and the other path is grounded; the other end of the coil of the relay K1 is divided into two paths, one path is connected with the cathode of a diode D2, and the other path is connected with the collector of a triode Q1; the emitting electrode of triode Q1 connects 5V power output end, triode Q1's base meets through resistance R4 and microcontroller 20's P1.1 pin, relay K1's common contact meets with electric heating pipe 4's live wire end, relay K1's normally open contact meets with the live wire end of access commercial power 220V, relay K1's normally closed contact is unsettled, electric heating pipe 4's zero line end meets with the zero line end of access commercial power 220V.
As shown in fig. 6, in the present embodiment, the temperature sensor 6 is a DS18B20 temperature sensor, the ground terminal of the DS18B20 temperature sensor is grounded, the power supply of the DS18B20 temperature sensor is connected to the 5V power supply output terminal, and the 2 nd pin (i.e., DATA pin) of the DS18B20 temperature sensor is connected to the P1.0 pin of the microcontroller 20.
As shown in fig. 7, in this embodiment, the display panel 1 is a ZX12232C display panel, a VDD pin of the ZX12232C display panel is connected to a 5V power output terminal, a VSS pin of the ZX12232C display panel is grounded, a VO pin of the ZX12232C display panel is connected to a sliding terminal of a sliding resistor R5, an RST pin, an E1 pin, an E2 pin, an R/W pin, and an RS pin of the ZX12232C display panel are respectively connected to a P2.3 pin, a P2.4 pin, a P2.5 pin, a P2.6 pin, and a P2.7 pin of the microcontroller 20, pins D0 and D7 of the ZX12232C display panel are respectively connected to pins P0.0 to P0.7 of the microcontroller 20, one fixed terminal of the sliding resistor R5 is connected to the 5V power output terminal, and the other fixed terminal of the sliding resistor R5 is grounded.
In this embodiment, the communication module 19 is a MAX232 communication module.
As shown in fig. 8, in a specific implementation, the communication module 19 includes a MAX chip 232, a 1 st pin of the MAX chip 232 is connected to a3 rd pin of the MAX chip 232 through a capacitor C8, a4 th pin of the MAX chip 232 is connected to a 5 th pin of the MAX chip 232 through a capacitor C10, an 11 th pin of the MAX chip 232 is connected to a P3.1 pin of the microcontroller 20, a 9 th pin of the MAX chip 232 is connected to a P3.0 pin of the microcontroller 20, a 16 th pin of the MAX chip 232 is connected to one end of a capacitor C9, and a 2 nd pin of the MAX chip 232 and a connection end of the other end of the capacitor C9 are connected to a 5V power output end; the TXD pin of the tilt sensor 15 is connected with the 8 th pin of the chip MAX232, and the RXD pin of the tilt sensor 15 is connected with the 14 th pin of the chip MAX 232A.
As shown in fig. 9, in this embodiment, in a specific implementation, the control box 13 is provided with a first connector 22, a second connector 23, a third connector 24 and a fourth connector 25 for connecting a temperature-sensing cable 30, the temperature-sensing cable 30 includes a first cable 30-2, a second cable 30-3 and a protective sleeve 30-1 covering the first cable 30-2 and the second cable 30-3, two ends of the first cable 30-2 are respectively connected to the first connector 22 and the second connector 23, and two ends of the second cable 30-3 are respectively connected to the third connector 24 and the fourth connector 25;
the temperature sensing cable detection circuit 29 comprises an operational amplifier U5A with the model of LM324 and an operational amplifier U5B with the model of LM324, an indicator light 26 is a light emitting diode D3, one end of a first cable 30-2 is connected with one end of a resistor R13, one end of a second cable 30-3 is connected with the other end of the resistor R13, the other end of the second cable 30-3 is grounded, the non-inverting input end of the operational amplifier U5A is divided into two paths, one path is connected with the other end of the first cable 30-2, and the other path is connected with a 5V power supply output end through a resistor R9; the inverting input end of the operational amplifier U5A is grounded through a resistor R8, the output end of the operational amplifier U5A is divided into two paths, one path is connected with the inverting input end of the operational amplifier U5A through a resistor R6, and the other path is connected with the inverting input end of the operational amplifier U5B; the positive phase input end of the operational amplifier U5B is divided into two paths, one path is grounded through a resistor R16, the other path is connected with the 5V power supply output end through a resistor R11, the output end of the operational amplifier U5B is connected with one end of a resistor R20, the other end of the resistor R20 is divided into two paths, one path is connected with the base electrode of a triode Q2 through a resistor R10, and the other path is connected with the cathode of a voltage regulator tube Dz; the collector of the triode Q2 is connected with the cathode of the light emitting diode D4, the anode of the light emitting diode D3 is connected with the 5V power output end through the resistor R7, and the anode of the voltage regulator tube Dz is grounded.
In this embodiment, in specific implementation, the first cable 30-2 and the second cable 30-3 both include elastic steel wire conductors, and each elastic steel wire conductor is wrapped with a layer of temperature-sensitive insulating material, and when the heating temperature rises to the alarm temperature, the temperature-sensitive insulating material will break, and the two elastic steel wire conductors generate a short circuit.
In this embodiment, in specific implementation, the microcontroller 20 is an STC12C5a48S2 single chip microcomputer.
In this embodiment, the tilt sensor 15 may be an LCA326T-10 tilt sensor.
In this embodiment, in specific implementation, the electric heating tube 4 is a fin dry-burning heating tube with a 220V power supply voltage, and has small thermal inertia, fast temperature rise, stable performance and reasonable structure.
In this embodiment, the transformer T1 is a 220 to 18V power transformer, and can be referred to as a core-only 220 to 18V power transformer.
In this embodiment, in a specific implementation, the power module 18 is configured to convert a 220V mains power, which is accessed through the plug 17, into 18V ac power through the transformer T1, the 18V ac power is converted into 18V dc power through the rectifier bridge D1, the 18V dc power is converted into 12V dc power through the LM7812, and the 12V dc power is converted into 5V dc power through the LM 7805.
In this embodiment, the second groove 12 formed in the top of the mounting plate 10 and the first groove 8 formed in the bottom of the heat conducting box 7 are surrounded to form a mounting groove for accommodating the temperature sensing cable, so as to avoid the extrusion damage of the temperature sensing cable caused by the direct clamping of the temperature sensing cable between the mounting plate 10 and the heat conducting box 7.
In this embodiment, the hydraulic rod 2 is provided to adjust the distance between the top of the mounting plate 10 and the bottom of the heat conducting box 7 by the lifting of the hydraulic rod 2, so as to adjust the distance between the second groove 12 and the first groove 8, thereby accommodating temperature sensing cables of different diameters and improving the application range.
In this embodiment, set up guide bar 11, be for the in-process of the lift of hydraulic stem 2 drive mounting panel 10 along guide bar 11 vertical up-and-down, through the direction to the mounting panel 10 four corners to avoid the slope of mounting panel 10 to cause the extrusion harm of temperature sensing cable.
In this embodiment, it should be noted that the first grooves 8 are arranged along the length direction of the bottom of the heat conduction box 7, and are located at the center of the bottom of the heat conduction box 7 along the width direction; the second groove 12 is arranged along the length direction of the top of the mounting plate 10 and is positioned at the center of the top of the mounting plate 10 along the width direction.
In this embodiment, the tilt angle sensor 15 is arranged to detect the tilt angle of the mounting plate 10 and send the detected tilt angle to the microcontroller 20, and the microcontroller 20 controls the display screen 14 to display the tilt angle until the mounting plate 10 is horizontally arranged according to the displayed tilt angle.
In this embodiment, the first locking member 9-1 and the second locking member 9-2 can be separated from the fixing ring, the hoop, etc., when the position of the mounting plate 10 needs to be adjusted, the first locking member 9-1 and the second locking member 9-2 are removed, and when the mounting plate 10 is horizontally arranged and adjusted in place, the first locking member 9-1 and the second locking member 9-2 are installed to fix the mounting plate 10.
In this embodiment, first locking member 9-1 and second locking member 9-2 are further referred to as separate securing rings of SCSAV SCS.
In this embodiment, the hydraulic rod 2 may refer to an exploding jack or other equivalent acting hydraulic rod.
In this embodiment, the first connector 22, the second connector 23, the third connector 24 and the fourth connector 25 are all referred to as JX5-6003 terminals.
In this embodiment, it should be noted that, the parameters of the circuit may refer to the parameters in the figure.
The utility model discloses during the specific use, at first be connected plug 18 with the access commercial power 220V power, when needs heat, microcontroller 20 output low level signal is through resistance R4 to triode Q1's base, triode Q1 switches on, relay K1's coil K1 gets electricity, relay K1's normally open contact is closed, thereby with electric heating pipe 4's live wire end and the live wire end switch-on of access commercial power 220V, will insert commercial power 220V and supply with electric heating pipe 4, electric heating pipe 4 gains electricity and begins to heat.
In the process of heating the electric heating tube 4, when the temperature sensing cable 30 is normal, the normal phase input end of the operational amplifier U5A in the temperature sensing cable detection circuit 29 is connected with the resistor R13, the voltage of the reverse phase input end of the operational amplifier U5B is greater than that of the positive phase input end of the operational amplifier U5B, the voltage stabilizing tube Dz is cut off, the output end of the operational amplifier U5B outputs low level 0V, the triode Q2 is cut off, and the light emitting diode D3 is not bright; when the temperature sensing cable 30 is short-circuited, a positive phase input end resistor R13 of an operational amplifier U5A in the temperature sensing cable detection circuit 29 is short-circuited, the voltage of a reverse phase input end of the operational amplifier U5B is smaller than that of a positive phase input end of the operational amplifier U5B, a voltage stabilizing tube Dz works in a voltage stabilizing state, the output end of the operational amplifier U5B outputs a high level voltage of 5V, a triode Q2 is conducted, and a light emitting diode D3 is bright; and at the in-process of electric heating pipe 4 heating, temperature sensor 6 detects the temperature in the heat conduction box 7 to send the temperature that detects to microcontroller 20, microcontroller 20 shows the temperature that receives through display screen 14, thereby when temperature sensing cable 30 short circuit, acquire the alarm temperature value when temperature sensing cable 30 takes place the short circuit, be convenient for provide the basis for temperature sensing cable's use, thereby realize the detection of the alarm temperature value of temperature sensing cable, can portably, accomplish the detection of temperature sensing cable fast, detection efficiency has been improved.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing above embodiment the utility model discloses technical scheme's within the scope of protection.
Claims (8)
1. A temperature sensing cable detection device is characterized in that: comprises a detection table (1), a heating mechanism arranged on the detection table (1), a mounting platform arranged on the detection table (1) and used for mounting a temperature sensing cable (30), and a detection module arranged on the detection table (1), wherein the mounting platform comprises a mounting plate (10), a hydraulic rod (2) arranged at the center of the bottom of the mounting plate (10) and guide rods (11) arranged at the periphery of the mounting plate (10), the heating mechanism comprises a heat conduction box body (7) and an electric heating pipe (4) arranged in the heat conduction box body (7), a first groove (8) is arranged at the bottom of the heat conduction box body (7), a second groove (12) is arranged at the top of the mounting plate (10), a mounting groove for accommodating the temperature sensing cable (30) is enclosed by the first groove (8) and the second groove (12), a temperature sensor (6) is arranged in the heat conduction box body (7), an inclination angle sensor (15) is arranged on the mounting plate (10);
the detection module comprises a control box (13), a display screen (14) and an indicator lamp (26) which are arranged on the control box (13), and an electronic circuit board which is arranged in the control box (13), wherein a microcontroller (20), a temperature sensing cable detection circuit (29) and a communication module (19) which is connected with the microcontroller (20) are integrated on the electronic circuit board, the output end of the microcontroller (20) is connected with a relay module (21) which is used for controlling the on-off of the electric heating pipe (4), the inclination angle sensor (15) is connected with the microcontroller (20) through the communication module (19), and the output end of the temperature sensor (6) is connected with the input end of the microcontroller (20).
2. A temperature-sensitive cable detecting device according to claim 1, wherein: the detection table is characterized in that an L-shaped connecting piece for installing the heat conduction box body (7) is arranged on the detection table (1), the L-shaped connecting piece comprises a vertical plate (3) installed on the detection table (1) and a horizontal plate (5) vertically arranged with the vertical plate (3), the bottom of the horizontal plate (5) is parallel to the top surface of the detection table (1), and the bottom of the horizontal plate (5) is fixedly connected with the top surface of the heat conduction box body (7).
3. A temperature-sensitive cable detecting device according to claim 1, wherein: be provided with first retaining member (9-1) and second retaining member (9-2) on guide bar (11), just the bottom side of first retaining member (9-1) and the top surface of mounting panel (10) are laminated mutually, the bottom side of mounting panel (10) is laminated mutually with the top side of second retaining member (9-2).
4. A temperature-sensitive cable detecting device according to claim 1, wherein: the control box (13) is provided with a plug (17) for accessing a mains supply 220V, the electronic circuit board is integrated with a power module (18), the power module (18) comprises a transformer T1, a chip LM7812 and a chip LM7805, one end of a primary coil of the transformer T1 is connected with one end of the primary coil accessed to the mains supply 220V through the plug (17), the other end of the primary coil of the transformer T1 is connected with the other end of the primary coil accessed to the mains supply 220V through the plug (17), two alternating current input ends of a rectifier bridge D1 are respectively connected with two ends of a secondary coil of the transformer T1, Vin pins of the chip LM7812 are divided into two paths, one path is connected with a positive direct current output end of the rectifier bridge D1, and the other path is grounded through a capacitor C3; the negative direct current output end of the rectifier bridge D1 is grounded with a GND pin of the chip LM7812, a Vout pin of the chip LM7812 is divided into two paths, one path is grounded through a capacitor C2, and the other path is a 12V power supply output end; the Vin pin of the chip LM7805 is divided into two paths, one path is connected with the 12V power output end, the other path is grounded through a capacitor C4, the Vout pin of the chip LM7805 is divided into two paths, the other path is grounded through a capacitor C5, the other path is the 5V power output end, and the GND pin of the chip LM7805 is grounded.
5. A temperature-sensitive cable detecting device according to claim 1, wherein: the relay module (21) comprises a relay K1 and a triode Q1, one end of a coil of the relay K1 is divided into two paths, one path is connected with the anode of a diode D2, and the other path is grounded; the other end of the coil of the relay K1 is divided into two paths, one path is connected with the cathode of a diode D2, and the other path is connected with the collector of a triode Q1; the emitting electrode of triode Q1 connects 5V power output end, triode Q1's base meets with microcontroller (20) through resistance R4, relay K1's common contact meets with the live wire end of electric heating pipe (4), relay K1's normally open contact meets with the live wire end of access commercial power 220V, relay K1's normally closed contact is unsettled, the zero line end and the zero line end of access commercial power 220V of electric heating pipe (4) meet.
6. A temperature-sensitive cable detecting device according to claim 1 or 2, wherein: the temperature sensor (6) is a DS18B20 temperature sensor, the grounding end of the DS18B20 temperature sensor is grounded, the power supply end of the DS18B20 temperature sensor is connected with a 5V power supply output end, and the 2 nd pin of the DS18B20 temperature sensor is connected with the microcontroller (20).
7. A temperature-sensitive cable detecting device according to claim 1 or 2, wherein: the communication module (19) is a MAX232 communication module.
8. A temperature-sensitive cable detecting device according to claim 1 or 2, wherein: the temperature sensing cable (30) comprises a first cable (30-2), a second cable (30-3) and a protective sleeve (30-1) sleeved outside the first cable (30-2) and the second cable (30-3), two ends of the first cable (30-2) are respectively connected to the first joint (22) and the second joint (23), and two ends of the second cable (30-3) are respectively connected to the third joint (24) and the fourth joint (25);
the temperature sensing cable detection circuit (29) comprises an operational amplifier U5A with the model of LM324 and an operational amplifier U5B with the model of LM324, an indicator light (26) is a light emitting diode D3, one end of a first cable (30-2) is connected with one end of a resistor R13, one end of a second cable (30-3) is connected with the other end of the resistor R13, the other end of the second cable (30-3) is grounded, the positive phase input end of the operational amplifier U5A is divided into two paths, one path is connected with the other end of the first cable (30-2), and the other path is connected with a 5V power supply output end through a resistor R9; the inverting input end of the operational amplifier U5A is grounded through a resistor R8, the output end of the operational amplifier U5A is divided into two paths, one path is connected with the inverting input end of the operational amplifier U5A through a resistor R6, and the other path is connected with the inverting input end of the operational amplifier U5B; the positive phase input end of the operational amplifier U5B is divided into two paths, one path is grounded through a resistor R16, the other path is connected with the 5V power supply output end through a resistor R11, the output end of the operational amplifier U5B is connected with one end of a resistor R20, the other end of the resistor R20 is divided into two paths, one path is connected with the base electrode of a triode Q2 through a resistor R10, and the other path is connected with the cathode of a voltage regulator tube Dz; the collector of the triode Q2 is connected with the cathode of the light emitting diode D4, the anode of the light emitting diode D3 is connected with the 5V power output end through the resistor R7, and the anode of the voltage regulator tube Dz is grounded.
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