CN216352198U - Portable paperless recorder - Google Patents

Abstract

The utility model discloses a portable paperless recorder which comprises a recorder body, wherein a signal acquisition board and a main board circuit board are arranged inside the recorder body, the main board circuit board is connected with the signal acquisition board in an inserting mode, a manual reset anti-power-off circuit used for resetting a microprocessor of the paperless recorder is arranged on the main board circuit board, a switching assembly used for connecting an external terminal is arranged on the signal acquisition board, a channel transverse plug board used for guiding the external terminal to be connected with the switching assembly is arranged on one side of the switching assembly, and the channel transverse plug board is clamped at the upper end of the recorder body. According to the utility model, the signal acquisition board provided with the switching assembly is fixedly connected with the recorder body in a screwing mode, and the channel transverse inserting plate is clamped with the recorder body, so that the signal acquisition board, the channel transverse inserting plate and the recorder body are convenient to disassemble and assemble, and a manufacturer does not need to make great changes on a paperless recorder when producing the paperless recorder with different interface ends, thereby reducing the cost of the manufacturer.

Description

Portable paperless recorder

Technical Field

The utility model relates to the technical field of recorders, in particular to a portable paperless recorder.

Background

The paperless recorder takes the time as a basic axis for collecting or operating data, and does not consume any conventional recording facilities. When the paperless recorder is used, the contents which are originally required to be recorded by tools such as a paper pen, a pen and ink can be stored in a storage module in the recorder, and the stored data in the recorder can be displayed on a liquid crystal screen after being operated and simulated.

In the prior art, a paperless recorder is generally connected with a transmitter through an external wiring terminal, but the size of the external wiring terminal used by a user is different, so that an interface end with a single specification model cannot adapt to different user requirements. In order to meet different customer requirements, manufacturers need to enable the interface end of the paperless recorder to be replaced more conveniently, so that the paperless recorder can be suitable for different customer requirements to produce products with different interface ends, and the production and development costs of the products with different interface ends are reduced. However, the paperless recorder in the prior art has a complex structure, and the interface end is inconvenient to replace, so that the production and processing cost of manufacturers is high.

Thus, the prior art has yet to be improved and enhanced.

SUMMERY OF THE UTILITY MODEL

In view of the defects of the prior art, the utility model aims to provide a portable paperless recorder, which aims to solve the problems that the paperless recorder in the prior art is complex in structure and inconvenient to replace an interface end.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a portable no paper record appearance, includes the record appearance body, the inside of record appearance body is provided with signal acquisition board and mainboard circuit board, mainboard circuit board pegs graft with the signal acquisition board, be provided with the manual circuit that prevents falling electric that resets that is used for making the microprocessor of no paper record appearance to reset on the mainboard circuit board, be provided with the switching subassembly that is used for connecting the external terminal on the signal acquisition board, one side of switching subassembly is provided with the horizontal picture peg of passageway that is used for guiding the external terminal to be connected with the switching subassembly, the horizontal picture peg of passageway block in the upper end of record appearance body.

The signal acquisition board is omnipotent collection board, the switching subassembly is a plurality of plug-in node terminal.

The signal acquisition board is the thermocouple acquisition board, the switching subassembly includes that thermocouple keysets and keysets connect to arrange and insert, the one end that the keysets is connected to arrange and inserts is pegged graft with the thermocouple acquisition board, the other end that the keysets is connected to arrange and inserts is pegged graft with the thermocouple keysets.

The thermocouple adapter plate is provided with a plurality of antenna elastic sheets arranged in an array manner.

The manual reset power-off prevention circuit comprises a reset module, a charge-discharge module, a first power-on module, a second power-on module and a level locking module, wherein when the reset module starts reset, the first power-on module starts to enable the charge-discharge module to discharge to control the level locking module to lock an output level, and when the microprocessor is powered on, the second power-on module performs compensation charging on the charge-discharge module.

The first power supply module comprises a first MOS (metal oxide semiconductor) tube, a first resistor and a first diode, the grid electrode of the first MOS tube is connected with one end of the reset module, the second power supply module and the first resistor, the source electrode of the first MOS tube is connected with the negative electrode of the first diode and the other end of the first resistor, the drain electrode of the first MOS tube is connected with the charge-discharge module, and the positive electrode of the first diode is connected with the VCC power supply end.

The charge and discharge module comprises a capacitor, a second resistor and a second diode, the anode of the second diode is connected with the drain electrode of the first MOS tube, grounded through the capacitor and grounded through the second resistor, and the cathode of the second diode is connected with the level locking module.

The level locking module comprises a first triode, a third resistor and a fourth resistor, wherein the base electrode of the first triode is connected with the negative electrode of the second diode through the third resistor and is grounded through the fourth resistor, the emitting electrode of the first triode is grounded, and the collecting electrode of the first triode is connected with the power switch module of the electronic equipment.

The second power supply module comprises a second triode, a fifth resistor and a sixth resistor, the base of the second triode is connected with the IO3 pin of the microprocessor through the fifth resistor and is grounded through the sixth resistor, the emitting electrode of the second triode is grounded, and the collecting electrode of the second triode is connected with the grid of the first MOS tube and the reset module.

The reset module comprises a reset key, a third diode, a fourth diode, a seventh resistor and an eighth resistor, one end of the reset key is connected with the negative pole of the third diode and the negative pole of the fourth diode, the other end of the reset key is grounded, the positive pole of the third diode is connected with the grid of the first MOS tube and the collector of the second triode through the seventh resistor, and the positive pole of the fourth diode is connected with the reset pin of the microcontroller through the eighth resistor.

Compared with the prior art, the portable paperless recorder provided by the utility model comprises a recorder body, wherein a signal acquisition board and a main board circuit board are arranged inside the recorder body, the main board circuit board is connected with the signal acquisition board in an inserting manner, a manual reset anti-power-off circuit for resetting a microprocessor of the paperless recorder is arranged on the main board circuit board, a switching assembly for connecting an external terminal is arranged on the signal acquisition board, a channel transverse plug board for guiding the external terminal to be connected with the switching assembly is arranged on one side of the switching assembly, and the channel transverse plug board is clamped at the upper end of the recorder body. According to the utility model, the signal acquisition board provided with the switching assembly is fixedly connected with the recorder body in a screwing mode, and the channel transverse insertion board is connected with the recorder body in a clamping mode, so that the signal acquisition board, the channel transverse insertion board and the recorder body are more convenient to disassemble and assemble, and when manufacturers need to produce paperless recorders with different interface ends, the paperless recorders do not need to be greatly changed, and the production and processing cost of the manufacturers is reduced.

Drawings

Fig. 1 is an exploded view of a paper-free recorder with thermocouple channels according to the present invention.

Fig. 2 is a schematic structural diagram of a front case of the paperless recorder provided by the utility model.

Fig. 3 is a schematic structural diagram of a rear case of the paperless recorder provided by the utility model.

Fig. 4 is an enlarged view of fig. 3.

Fig. 5 is a schematic structural view of a thermocouple junction plate provided by the present invention.

Fig. 6 is a schematic view of an angle structure of the thermocouple channel paperless recorder provided by the present invention.

Fig. 7 is a schematic structural view of another angle of the thermocouple channel paperless recorder provided by the utility model.

Fig. 8 is an exploded view of the universal channel paperless recorder of the present invention.

Fig. 9 is a schematic structural diagram of the universal collecting plate provided by the utility model.

FIG. 10 is a schematic structural view of a universal channel horizontal insertion plate according to the present invention

Fig. 11 is a schematic structural view of the universal channel paperless recorder provided by the utility model.

Fig. 12 is a schematic circuit diagram of a manual reset power-down prevention circuit provided by the present invention.

Fig. 13 is a schematic diagram of a three-point cold end compensation device of a multi-channel thermocouple recorder provided by the utility model.

Fig. 14 is a schematic diagram of a temperature sensor of a three-point cold end compensation device of a multi-channel thermocouple recorder provided by the utility model.

Detailed Description

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

It will be understood that when an element is referred to as being "on," "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

It should be noted that the terms of orientation such as left, right, up and down in the embodiments of the present invention are only relative to each other or are referred to the normal use state of the product, and should not be considered as limiting.

The utility model provides a portable paperless recorder, please refer to fig. 1-7, which comprises a recorder body 100, wherein a signal acquisition board and a main board circuit board 3 are arranged inside the recorder body 100, the main board circuit board 3 is inserted into the signal acquisition board, a manual reset power-off prevention circuit for resetting a microprocessor of the paperless recorder is arranged on the main board circuit board 3, a switching assembly for connecting an external terminal is arranged on the signal acquisition board, a channel transverse plug board for guiding the external terminal to be connected with the switching assembly is arranged on one side of the switching assembly, and the channel transverse plug board is clamped at the upper end of the recorder body 100. According to the utility model, the signal acquisition board provided with the switching assembly is fixedly connected with the recorder body 100 in a screwing mode, and the channel transverse insertion board is connected with the recorder body 100 in a clamping mode, so that the signal acquisition board, the channel transverse insertion board and the recorder body 100 are more convenient to disassemble and assemble, and when manufacturers need to produce paperless recorders with different interface ends, the paperless recorders do not need to be greatly changed, and the production and processing cost of the manufacturers is reduced.

Referring to fig. 8-10, the signal collecting board is a universal collecting board 1, and the switching component is a plurality of plug-in node terminals 11. The universal acquisition board 1 can acquire externally input current signals, voltage signals, resistance signals, thermocouple signals and the like through the plug-in node terminals 11, the plug-in node terminals 11 are arranged at the upper end of the universal acquisition board 1 and are arranged continuously, and the plug-in node terminals 11 can be arranged on the universal acquisition board 1 in a screw fixing or gluing mode. The specific number of the plug-in node terminals 11 is not limited in the present application, and the number of the plug-in node terminals 11 may be 4, 8, 12, or 16, and so on. In the application, the channel horizontal plug board corresponding to the universal acquisition board 1 and the plug-in type node terminal 11 is a universal channel horizontal plug board 101, and a rectangular notch (not marked in the figure) is arranged on the universal channel horizontal plug board 101 to prevent the opening of the plug-in type node terminal 11 from being shielded; the plug-in type node terminals 11 with different numbers correspond to the universal channel horizontal plug boards 101 with different rectangular gaps.

Referring to fig. 1, 4 and 8, the signal acquisition board is a thermocouple acquisition board 2, the switching assembly includes a thermocouple switching board 21 and a switching board connection extension 22, one end of the switching board connection extension 22 is inserted into the thermocouple acquisition board 2, and the other end of the switching board connection extension 22 is inserted into the thermocouple switching board 21. In the embodiment of the application, the thermocouple acquisition board 2 can acquire an externally input thermocouple signal through a thermocouple adapter board 21 and a adapter board connecting socket 22; the difference between thermocouple signals collected by the universal collecting plate 1 and the plug-in node terminal 11 and thermocouple signals collected by the thermocouple collecting plate 2, the thermocouple adapter plate 21 and the adapter plate connecting row plug 22 is that the thermocouple signals and the thermocouple signals are different in interface specification size from external wiring terminals, the signal collecting plate and the adapter assembly are simply disassembled and assembled, and the replacement mode is adopted to adapt to the external wiring terminals with different specifications and sizes, so that the production and development cost of manufacturers is reduced. As shown in fig. 1 and 4, the thermocouple junction plate 21 is vertically disposed on a side of the thermocouple collecting plate 2, and the thermocouple junction plate 21 is fixed to the recorder body 100 by a fastener (not labeled in the figures). Be provided with the jack that is used for pegging graft the keysets on board 2 and the thermocouple keysets 21 and connects row and insert 22, the keysets is connected row and is inserted 22 and includes a plurality of L type contact pin (not mark in the picture), the upper end of L type contact pin is pegged graft with the jack on the thermocouple collecting board 2, the lower extreme and the thermocouple keysets 21 of L type contact pin are pegged graft, and collect board 2 and thermocouple keysets 21 with the thermocouple through L type contact pin and be connected, on the one hand the grafting mode is more convenient when the dismouting than the cable connection, and on the other hand adopts the grafting mode to avoid leading to the chaotic problem of line connection because of the inside cable of no paper record appearance more.

Referring to fig. 1, 5 and 11, a plurality of antenna spring pieces 23 are arranged in an array on the thermocouple adapter plate 21, the number of the L-shaped pins corresponds to the number of the jacks, and the number of the L-shaped pins is greater than or equal to the number of the antenna spring pieces 23. In the present application, the specific number of the antenna dome 23 is not limited, and the number of the antenna dome 23 may be 4, 8, 12, or 16, and the like. In this application the horizontal picture peg of passageway that board 2, thermocouple keysets 21, keysets connection row were inserted 22 and antenna shell fragment 23 corresponds is the horizontal picture peg 102 of thermocouple passageway, be provided with the opening corresponding with antenna shell fragment 23 quantity on the horizontal picture peg 102 of thermocouple passageway.

Referring to fig. 1 to 3 again, the recorder body 100 includes a front case 1001 and a rear case 1002, the front case 1001 is provided with a fixing post 1003, the rear case 1002 is provided with a countersunk hole (not labeled in the figures), a screw passes through the countersunk hole and the fixing post 1003 to fix the front case 1001 and the rear case 1002, the dismounting and the mounting are simple, the countersunk hole is provided, the screw is prevented from protruding out of the surface of the recorder body 100 after being fastened, and the product is more beautiful; the signal acquisition board is disposed between the front case 1001 and the rear case 1002 by a screw coupling manner. The clamping pieces are arranged on the rear shell 1002, the number of the clamping pieces is at least two, 4 clamping pieces are provided in the application, the installation of the thermocouple adapter plate 21 is more stable through the four clamping pieces, the condition that the thermocouple adapter plate 21 moves to cause inconvenient insertion when a user inserts an external joint is avoided, the clamping pieces are plate-shaped clamping pieces in figure 4, the clamping piece is provided with a clamping groove (not marked in the figure), the thermocouple adapter plate 21 is inserted into the clamping groove of the clamping piece, the thermocouple adapter plate 21 is clamped on the rear shell 1002 through a clamping groove, the width of the clamping groove is equal to or slightly smaller than the thickness of the thermocouple adapter plate 21, the thermocouple adapter plate 21 is fixed in a clamping mode, so that the fixing mode is simple compared with the screw fixing mode, and the problems that the thermocouple adapter plate 21 is not fixed well and is unstable after being fixed due to the arrangement direction of the thermocouple adapter plate are solved. Fixed preceding shell 1001 and backshell 1002 through the mode of spiro union makes things convenient for dismouting record appearance body 100, further makes the replacement of signal acquisition board, switching subassembly and the horizontal picture peg of passageway more convenient.

Referring to fig. 1, 6, 7 and 8, a main board circuit board 3 is further disposed inside the recorder body 100, the main board circuit board 3 is disposed on one side of the front housing 1001 in a screw connection manner, and the main board circuit board 3 is further provided with an RJ45 interface module 31, an HOME button module 32, a switch button module 33, a USB interface module 34, a Type-C interface module 35 and an SD card module 36. The mainboard circuit board 3 is connected with the display screen 41 and is also spliced with the signal acquisition board. And the mainboard circuit board 3 is also provided with a microprocessor, a power switch module and a manual reset anti-power-off circuit.

A display screen 41 and a display screen pressing plate 42 are sequentially arranged between the front shell 1001 and the main board circuit board 3, and the display screen 41 is fixed with the front shell 1001 through the display screen pressing plate 42 in a threaded manner. The pressing plate screw 43 fixes the display screen 41 on the front shell 1001 through the fixing lug on the display screen pressing plate 42, and the front shell 1001 is further provided with a limiting piece for limiting the movement of the display screen 41, so that the position of the display screen 41 is limited from the periphery through the limiting piece.

Referring to fig. 4, 8 and 10, a first extending portion 51 is disposed on one pair of sides of the channel cross plate, a first engaging groove 52 is disposed on the other pair of sides of the channel cross plate, and a second engaging groove 54 and a second extending portion 53, which are engaged with the first extending portion 51 and the first engaging groove 52, are disposed on the front shell 1001 and the rear shell 1002. The transverse channel inserting plate is clamped between the front shell 1001 and the rear shell 1002, when the transverse channel inserting plate is disassembled, only the screws used for connecting the front shell 1001 and the rear shell 1002 need to be taken down, then the front shell 1001 of the rear shell 1002 is disassembled, and the transverse channel inserting plate is pulled, so that the first extending portion 51 moves towards one side along the second clamping groove 54, and the transverse channel inserting plate can be taken down.

Referring to fig. 1, 3 and 8 again, a battery 6 is further disposed in the recorder body 100, the battery 6 is connected to the motherboard circuit board 3 through a wire, the battery 6 is clamped in the limiting portion 1005 of the rear case 1002, and the battery 6 is further adhered to the display screen pressing plate 42 through an elastic protection foam of a double-back-surface adhesive. The back of the recorder body 100 is provided with a support 7 for supporting the recorder, the support 7 is hinged to the rear shell 1002, and the back of the rear shell 1002 is provided with an accommodating groove 8 for accommodating the support 7. The rear shell 1002 of the paperless recorder is also provided with a battery heat dissipation hole 1006 and a sensor vent 1007, and the battery heat dissipation hole 1006 and the sensor vent 1007 are provided with a dust screen with single-sided back adhesive; a sensor placing bin 1008 for mounting a sensor is arranged on the side edge of the sensor vent 1007, the sensor is fixed in the sensor placing bin 1008 through a cover plate (not shown in the figure), and the cover plate is fixed on a screw seat (not marked in the figure) on the side edge of the sensor placing bin 1008 through screws. The support 7 is arranged so that the recorder can be supported during use, thereby facilitating observation of data on the display screen 41. The outside cover of record appearance body 100 is equipped with the protective sheath 9 that is used for protecting record appearance body 100, protective sheath 9 can adopt silica gel, thermoplastic polyurethane elastomer rubber.

In order to ensure that the paperless recorder system can be restarted by manual operation when abnormality occurs and necessary and overcome the defects of the conventional reset circuit, the utility model introduces a capacitance energy storage circuit and a switch circuit based on an MOS tube switch, and solves the problem of power failure of the manual reset circuit in the states of manual reset and soft on-off by utilizing the charge-discharge characteristic of a capacitor.

The utility model further provides a manual reset power-down prevention circuit, which is used for resetting a microprocessor of a paperless recorder, please refer to fig. 12, the manual reset power-down prevention circuit comprises a reset module 901, a charge and discharge module 902, a first power-up module 903, a second power-up module 904 and a level locking module 905, the reset module 901 and the second power-up module 904 are connected with the first power-up module 903, and the first power-up module 903 is connected with an IO1 pin of the microprocessor and the level locking module 905.

When the reset module 901 starts resetting, the first power-on module 903 starts to enable the charge-discharge module 902 to discharge and control the level locking module 905 to lock an output level, when the microprocessor is powered on, the second power-on module 904 compensates charging for the charge-discharge module 902, so as to compensate the situation that the capacitor C1 of the charge-discharge module 902 is insufficiently charged during manual resetting, thereby effectively preventing power failure during resetting and improving the reliability of resetting.

Referring to fig. 12, the first power-up module 903 includes a first MOS transistor Q1, a first resistor R1 and a first diode D1, the first MOS transistor Q1 is a P-channel MOS transistor, the first MOS transistor Q1 is turned on when the gate of the first MOS transistor Q1 is at a low level, the first resistor R1 is a pull-up resistor, and the first diode D1 mainly plays a role in isolation and preventing backflow of signals.

The gate of the first MOS transistor Q1 is connected to one end of the reset module 901, the second power-continuing module 904 and the first resistor R1, the source of the first MOS transistor Q1 is connected to the cathode of the first diode D1 and the other end of the first resistor R1, the drain of the first MOS transistor Q1 is connected to the charge-discharge module 902, and the anode of the first diode D1 is connected to the VCC power supply terminal.

The charging and discharging module 902 includes a capacitor C1, a second resistor R2, and a second diode D2, the capacitor C1 plays a role of storage and power supply, and the second diode D2 also plays a role of isolation to prevent signal backflow.

In this embodiment, the anode of the second diode D2 is connected to the drain of the first MOS transistor Q1, grounded through the capacitor C1, and grounded through the second resistor R2, and the cathode of the second diode D2 is connected to the level-locking module 905.

The level locking module 905 comprises a first triode Q2, a third resistor R3 and a fourth resistor R4, the first triode Q2 is an NPN triode, when the base of the triode Q2 is at a high level, the first triode Q2 is turned on, and the third resistor R3 is a current-limiting resistor.

The base electrode of the first triode Q2 is connected with the negative electrode of the second diode D2 through a third resistor R3 and is also grounded through a fourth resistor R4, the emitting electrode of the first triode Q2 is grounded, and the collecting electrode of the first triode Q2 is connected with the power switch module 906 of the paperless recorder.

Referring to fig. 12, the second power resuming module 904 includes a second transistor Q3, a fifth resistor R5 and a sixth resistor R6, the second transistor Q3 is also an NPN transistor, and when the base thereof is at a high level, the fifth resistor R5 is also a current-limiting resistor.

The base electrode of the second triode Q3 is connected with the IO3 pin of the microprocessor through a fifth resistor R5 and also grounded through a sixth resistor R6, the emitter electrode of the second triode Q3 is grounded, and the collector electrode of the second triode Q3 is connected with the gate electrode of the first MOS transistor Q1 and the reset module 901. After the microprocessor is powered on, the pin IO3 outputs high level to make the second triode conductive for compensating the charging time of the capacitor C1.

The reset module 901 comprises a reset key K1, a third diode Q3, a fourth diode D4, a seventh resistor R7 and an eighth resistor R8, wherein the reset key K1 is a switch key for a user to press down to manually start reset. One end of the reset key K1 is connected to the cathode of the third diode Q3 and the cathode of the fourth diode D4, the other end of the reset key K1 is grounded, the anode of the third diode Q3 is connected to the gate of the first MOS transistor Q1 and the collector of the second transistor Q3 through a seventh resistor R7, and the anode of the fourth diode D4 is connected to the reset pin of the microcontroller through an eighth resistor R8.

The power switch module 906 includes a power key K2, a second MOS transistor Q4, a fifth diode D5, a sixth diode D6, and a ninth resistor R9, the power key K2 may also adopt a switch key for a user to press a manual start power, the second MOS transistor Q4 also adopts a P-channel MOS transistor, and when the gate of the second MOS transistor Q4 is at a low level, the second MOS transistor Q4 is turned on. The ninth resistor R9 is a pull-up resistor.

One end of the power key K2 is connected to the cathode of the fifth diode D5 and the cathode of the sixth diode D6, the anode of the sixth diode D6 is connected to the IO2 pin of the microprocessor, and the anode of the fifth diode D5 is connected to the gate of the second MOS transistor Q4 and the collector of the first triode, and is also connected to the VCC power supply terminal through the ninth resistor R9.

The manual reset power-off prevention circuit further comprises a seventh diode D7, the seventh diode D7 is an isolation diode, the anode of the seventh diode D7 is connected with an IO1 pin of the microprocessor, the cathode of the seventh diode D7 is connected with the cathode of the second diode D2, and the cathode of the seventh diode D7 is also connected with the base of the second triode Q3 through a third resistor R3.

For a better understanding of the present invention, the operation of the manual reset power down prevention circuit of the present invention is described in detail below with reference to fig. 12:

in fig. 12, a VCC power supply terminal is a system power supply, and the microprocessor may employ an MSP430 series chip, such as an MSP430F6736 chip, which has rich IO (e.g., a P port of the MSP430 chip) and good expansion performance, such as an IO3 port.

When the RESET key is pressed down, a RESET pin RESET _ MCU of the microprocessor is changed into low level to trigger the microprocessor to RESET, meanwhile, the first MOS tube Q1, the first triode Q2 and the second MOS tube Q4 are all conducted, the capacitor C1 discharges in the RESET period to maintain the conduction of the first triode Q2, the level of an IO1 port of the microprocessor is locked to maintain the power supply of a system, and the power failure of the system power supply is prevented. When the charge stored in the capacitor C1 comes from the pressing of the reset key K1, the first MOS transistor Q1 is turned on, and the system power VCC of the capacitor C1 is charged through the first diode D1.

In addition, after the reset key is pressed, the charge provided by the capacitor C1 is not enough to maintain the power consumed by the conduction of the first transistor Q2 during the reset period, so that when the microprocessor is powered on, the output of high level from the IO3 port controls the conduction of the second MOS transistor Q4, further enabling the first MOS transistor Q1, which can provide 500mS of charging time for the first MOS transistor Q1, so as to compensate the situation that the capacitor C1 is not enough charged when the reset key is pressed.

In addition, the existing paperless recorder faces to multi-channel thermocouple collection, and the accuracy consistency of multi-channel realization by a conventional cold junction compensation method is poor. With the increasing demand of industrial fields for multi-channel acquisition instruments, the conventional method cannot meet the requirements of high precision and reliability of cold end compensation. Based on the three-point cold end compensation device, the utility model also provides a three-point cold end compensation device, and aims to solve the problem of insufficient multi-channel acquisition compensation precision in the prior art.

Referring to fig. 13 and 14 together, the three-point cold end compensation device includes: an analog switch 10 and a temperature sensor, the temperature sensor further comprising: a first Temperature Sensor 210, a second Temperature Sensor 220, and a third Temperature Sensor 230 (shown as Temperature Sensor1, Temperature Sensor2, and Temperature Sensor3, respectively); the first temperature sensor 210, the second temperature sensor 220 and the third temperature sensor 230 are respectively connected with the analog switch 10 through communication buses. The present invention reads the data of each temperature sensor through the analog switch 10 switching sequence. Because the temperature of the position of each channel of the multi-channel thermocouple recorder is influenced by the environment and can be in gradient difference, the cold end temperature of each channel can be obtained by averaging the difference of the data read by the three temperature sensors to each channel. Compared with the conventional multi-channel cold end compensation method, the method has the advantages of less material consumption, low cost and good reliability.

In the present embodiment, the first temperature sensor 210, the second temperature sensor 220 and the third temperature sensor 230 use three digital temperature sensors of the same type for digital temperature acquisition, such as a ds18b20 temperature sensor. The analog switch 10 employs RS2255XN primarily for switching the individual temperature sensing bus channels. Further, the three-point cold junction compensation device of the multi-channel thermocouple recorder further comprises a control chip 300, wherein the control chip 300 is connected with the analog switch 10, outputs a control signal, and sequentially selects the first temperature sensor 210, the second temperature sensor 220 and the third temperature sensor 230 through the analog switch 10. The method uses a shared communication bus to sequentially read the data of each temperature sensor.

In this embodiment, the multichannel acquisition instrument has 16 channels. The first temperature sensor 210 and the third temperature sensor 230 are respectively located at two sides of a channel of the multi-channel acquisition instrument, and the second temperature sensor 220 is located between an eighth channel and a ninth channel of the multi-channel acquisition instrument. The first temperature sensor 210, the second temperature sensor 220 and the third temperature sensor 230 share a communication single bus, bus selection is switched through a four-channel analog switch (analog switch 10), a control chip 300(MCU) outputs a control signal, the first temperature sensor 210, the second temperature sensor 220 and the third temperature sensor 230 are sequentially selected (in this way, the shared communication bus is used), and data of each temperature sensor are sequentially read. Because the temperature of the position of each channel of the multi-channel acquisition instrument is influenced by the environment and can be in gradient difference, the cold end temperature of each channel can be obtained by averaging the difference of the data read by the three temperature sensors to each channel. Compared with the traditional independent temperature sensor configuration for each channel cold end compensation, the cost of the temperature sensor can be saved, the difficulty of PCB design is reduced, and the higher cost performance cold end temperature compensation is realized.

In summary, the portable paperless recorder provided by the utility model comprises a recorder body, wherein a signal acquisition board and a main board circuit board are arranged inside the recorder body, the main board circuit board is inserted into the signal acquisition board, an anti-power-off circuit for resetting a microprocessor of the paperless recorder is arranged on the main board circuit board, a switching assembly for connecting an external terminal is arranged on the signal acquisition board, a channel transverse plug board for guiding the external terminal to be connected with the switching assembly is arranged on one side of the switching assembly, and the channel transverse plug board is clamped at the upper end of the recorder body. According to the utility model, the signal acquisition board provided with the switching assembly is fixedly connected with the recorder body in a screwing mode, and the channel transverse insertion board is connected with the recorder body in a clamping mode, so that the signal acquisition board, the channel transverse insertion board and the recorder body are more convenient to disassemble and assemble, and when manufacturers need to produce paperless recorders with different interface ends, the paperless recorders do not need to be greatly changed, and the production and processing cost of the manufacturers is reduced. When the reset module is manually started to reset, the first power-on module is started to enable the charging and discharging module to discharge and control the level locking module to lock the output level, when the microprocessor is powered on, the second power-on module is used for compensating charging of the charging and discharging module, so that the condition that the capacitor of the charging and discharging module is insufficiently charged during manual reset is compensated, power failure during reset is effectively prevented, and the reset reliability is improved.

It should be understood that the technical solutions and the inventive concepts according to the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.

Claims (10)

1. The utility model provides a portable paperless recorder, includes the recorder body, its characterized in that, the inside of recorder body is provided with signal acquisition board and mainboard circuit board, mainboard circuit board pegs graft with the signal acquisition board, be provided with the manual circuit that prevents falling electric circuit that resets that is used for making the microprocessor of paperless recorder to reset on the mainboard circuit board, be provided with the switching subassembly that is used for connecting the external terminal on the signal acquisition board, one side of switching subassembly is provided with the passageway horizontal picture peg that is used for guiding the external terminal to be connected with the switching subassembly, the passageway horizontal picture peg block is in the upper end of recorder body.

2. The portable paperless recorder of claim 1, wherein said signal acquisition board is a universal acquisition board and said switching assembly is a plurality of plug-in node terminals.

3. The portable paperless recorder of claim 1, wherein said signal acquisition board is a thermocouple acquisition board, said adapter module comprises a thermocouple adapter board and an adapter board connection extension socket, one end of said adapter board connection extension socket is connected with said thermocouple acquisition board, and the other end of said adapter board connection extension socket is connected with said thermocouple adapter board.

4. The portable paperless recorder of claim 3, wherein said thermocouple adapter plate comprises a plurality of antenna springs arranged in an array.

5. The portable paperless recorder of claim 1, wherein the manual reset power-down prevention circuit comprises a reset module, a charge-discharge module, a first power-on module, a second power-on module and a level locking module, wherein when the reset module starts reset, the first power-on module starts to enable the charge-discharge module to discharge and control the level locking module to lock an output level, and when the microprocessor is powered on, the second power-on module performs compensation charging on the charge-discharge module.

6. The portable paperless recorder of claim 5, wherein the first power supply module comprises a first MOS transistor, a first resistor and a first diode, a gate of the first MOS transistor is connected to the reset module, the second power supply module and one end of the first resistor, a source of the first MOS transistor is connected to a negative electrode of the first diode and the other end of the first resistor, a drain of the first MOS transistor is connected to the charge-discharge module, and an anode of the first diode is connected to the VCC power supply terminal.

7. The portable paperless recorder of claim 6, wherein the charge-discharge module comprises a capacitor, a second resistor and a second diode, wherein an anode of the second diode is connected to a drain of the first MOS transistor, grounded through the capacitor, and grounded through the second resistor, and a cathode of the second diode is connected to the level-locking module.

8. The portable paperless recorder of claim 7, wherein said level-locking module comprises a first transistor, a third resistor and a fourth resistor, wherein a base of said first transistor is connected to a negative terminal of said second diode through said third resistor and to ground through said fourth resistor, an emitter of said first transistor is connected to ground, and a collector of said first transistor is connected to a power switch module of said electronic device.

9. The portable paperless recorder of claim 7, wherein said second power supplying module comprises a second transistor, a fifth resistor and a sixth resistor, wherein a base of said second transistor is connected to IO3 pin of the microprocessor through the fifth resistor and also connected to ground through the sixth resistor, an emitter of said second transistor is connected to ground, and a collector of said second transistor is connected to the gate of the first MOS transistor and the reset module.

10. The portable paperless recorder of claim 9, wherein the reset module comprises a reset key, a third diode, a fourth diode, a seventh resistor and an eighth resistor, wherein one end of the reset key is connected to a cathode of the third diode and a cathode of the fourth diode, the other end of the reset key is grounded, an anode of the third diode is connected to a gate of the first MOS transistor and a collector of the second transistor through the seventh resistor, and an anode of the fourth diode is connected to a reset pin of the microcontroller through the eighth resistor.

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