阅读说明：本技术 一种基于云的联合收获机收割检测装置 (Combine harvester reaps detection device based on cloud ) 是由 姬虹 张文天 葛朝 黄文康 顾广钊 张静 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种基于云的联合收获机收割检测装置,有效的解决了现有技术中的联合收获机因凹板间隙过大、车速过快而影响到联合收获机对小麦等作物的收割的情况发生。本发明的检测装置包括信号采集电路、信号处理电路,所述信号采集电路利用测距传感器U1和车速传感器U2分别采集凹板间隙的距离信号和联合收获机的车速信号,采集到的距离信号和车速信号输出至信号处理电路,所述信号处理电路将距离信号和车速信号经判断器进行判断后将传输器导通,传输器产生报警信号,并将报警信号输出至ECU,从而避免了因凹板间隙的距离过大、车速过快对联合收获机收割工作的影响。(The invention discloses a cloud-based harvesting detection device of a combined harvester, which effectively solves the problem that the harvesting of crops such as wheat and the like by the combined harvester is influenced due to overlarge gap between concave plates and too fast speed in the prior art. The detection device comprises a signal acquisition circuit and a signal processing circuit, wherein the signal acquisition circuit respectively acquires a distance signal of a concave plate gap and a vehicle speed signal of the combine harvester by using a distance measuring sensor U1 and a vehicle speed sensor U2, the acquired distance signal and the acquired vehicle speed signal are output to the signal processing circuit, the signal processing circuit judges the distance signal and the vehicle speed signal by a judging device and then conducts a transmitter, the transmitter generates an alarm signal and outputs the alarm signal to an ECU (electronic control unit), and therefore the influence of overlarge distance of the concave plate gap and too fast vehicle speed on the harvesting work of the combine harvester is avoided.)

1. The utility model provides a detection device is reaped to combine based on cloud, a serial communication port, detection device includes signal acquisition circuit, signal processing circuit, signal acquisition circuit utilizes range sensor U1 and speed sensor U2 to gather the distance signal in concave plate clearance and combine harvester's vehicle speed signal respectively, and the distance signal and the vehicle speed signal of gathering export to signal processing circuit, signal processing circuit switches on the transmitter after judging distance signal and vehicle speed signal through judger, and the transmitter produces alarm signal to alarm signal output to ECU.

2. The cloud-based combine harvester detection device as claimed in claim 1, wherein the signal acquisition circuit comprises a distance measurement sensor U1 and a vehicle speed sensor U2, the distance measurement sensor U1 and the vehicle speed sensor U2 are used by the signal acquisition circuit to acquire a distance signal of a concave plate gap and a vehicle speed signal of the combine harvester respectively, the distance signal is filtered and then transmitted to the signal processing circuit, and the vehicle speed signal is then output to the signal processing circuit.

3. The harvest detection device of a cloud-based combine harvester as claimed in claim 2, wherein the signal acquisition circuit comprises a distance measurement sensor U1 and a vehicle speed sensor U2, wherein pin 1 of the distance measurement sensor U1 is connected with the upper end of a resistor R3, the adjustable end of a resistor R3, the drain of a field effect transistor Q1, pin 1 of a vehicle speed sensor U2 and connected with a positive power supply VCC, pin 2 of the distance measurement sensor U1 is connected with one end of a capacitor C1 and one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R27, one end of the capacitor C2 and the gate of the field effect transistor Q1, the source of the field effect transistor Q1 is connected with one end of a resistor R2 and one end of a resistor R4, the other end of the resistor R27 is connected with the lower end of a resistor R3, the other end of an electrical fault R4 is connected with the same phase end of an operational amplifier U3A, the inverting end of the operational U3A is connected with one end of a resistor R5, the other end of the resistor R5 is connected with the output end of the operational amplifier U3A, the other end of the resistor R2 is respectively connected with the other end of the capacitor C2, the other end of the capacitor C1, the pin 3 of the distance measuring sensor U1 and the pin 3 of the vehicle speed sensor U2 and is connected with the ground, the pin 2 of the vehicle speed sensor U2 is connected with one end of the resistor R16, the other end of the resistor R16 is connected with the non-inverting end of the operational amplifier U5A, the inverting end of the operational amplifier U5A is connected with one end of the resistor R14, and the other end of the resistor R14 is connected with the output end of the operational amplifier U5A.

4. The harvest detection apparatus of claim 1, wherein the signal processing circuit comprises a determiner and a transmitter, the determiner receives the distance signal and the vehicle speed signal from the signal acquisition circuit, the distance signal is determined by the determiner and then output to the transmitter, the vehicle speed signal is determined by the determiner and then output to the transmitter, the transmitter generates the alarm signal by using the distance signal and the high level, and the alarm signal is transmitted to the ECU.

5. The cloud-based harvester harvest detection device of a combine harvester of claim 1, wherein the determiner comprises an operational amplifier U4A and an operational amplifier U6A, wherein a non-inverting terminal of the operational amplifier U4A is connected to one terminal of a resistor R28, the other terminal of the resistor R28 is connected to an anode of a thyristor Q5, the other terminal of a resistor R5 in the signal acquisition circuit, and an output terminal of an operational amplifier U3A, an inverting terminal of the operational amplifier U4A is connected to one terminal of a bipolar TVS diode D1, one terminal of a resistor R7, and a lower terminal of a resistor R6, an upper terminal of the resistor R6 is connected to one terminal of a resistor R8, an emitter of a triode Q4, an adjustable terminal of a resistor R6, one terminal of a resistor R13, one terminal of a resistor R9, one terminal of a positive terminal of a resistor R25, and a power source VCC, and an output terminal of the operational amplifier U4A is connected to the other terminal of the resistor R8, a base of the triode Q4, the base of the bipolar diode TVS 4, the base of the other terminal of the resistor R1, the positive terminal of the bipolar TVS 25, the resistor R1, and the output terminal of the signal acquisition circuit, One end of a resistor R10, a collector of a triode Q4 is connected with an anode of a voltage regulator tube D7, a cathode of a voltage regulator tube D7 is connected with one end of a resistor R26, the other end of a resistor R26 is connected with one end of a capacitor C3, the other end of a resistor R10 is connected with a base of a triode Q3, a collector of a triode Q3 is respectively connected with the other end of a resistor R9, a distance adjuster and a control electrode of a thyristor Q5, an emitter of a triode Q3 is connected with one end of a resistor R11, the other end of a resistor R11 is respectively connected with the other end of a capacitor C3, the lower end of a resistor R15 and one end of a resistor R18 and is connected with ground, the upper end of a resistor R15 is respectively connected with the other end of the resistor R15, an adjustable end of the resistor R15 and a non-inverting end of an operational amplifier U6 15, an inverting end of the operational amplifier U6 15 is respectively connected with one end of a bipolar diode D15 and an output end of the operational amplifier U15, the other end of the resistor R17 is connected with the base electrode of the triode Q2, the collector electrode of the triode Q2 is respectively connected with the other end of the resistor R25 and the negative electrode of the voltage-regulator tube D8, the positive electrode of the voltage-regulator tube D8 is connected with the speed reducer, and the emitter electrode of the triode Q2 is connected with the other end of the resistor R18.

6. The harvest detection device of a cloud-based combine harvester according to claim 1, wherein the transmitter comprises a resistor R12 and a resistor R19, one end of the resistor R12 is connected with the cathode of a thyristor Q5 in the interpreter, the other end of the resistor R12 is connected with the in-phase end of an operational amplifier U7A, the inverting end of the operational amplifier U7A is connected with one end of a resistor R20 and one end of a resistor R21 respectively, the output end of the operational amplifier U7A is connected with the other end of the resistor R20 and the anode of a diode D6 respectively, the cathode of the diode D6 is connected with the cathode of a diode D4, one end of a resistor R22 and one end of a resistor R23 respectively, the anode of the diode D4 is connected with one end of a resistor R19, the other end of the resistor R19 is connected with the cathode of a voltage stabilizing tube D8 and a speed reducer respectively, the other end of the resistor R2 is connected with the in-phase end of an operational amplifier U A, and one end of the inverting end of the operational amplifier U8427 is connected with the resistor R24 respectively, One end of a resistor R29, the other end of the resistor R24 are respectively connected with the output end of the operational amplifier U8A, the ECU and one end of a bipolar TVS diode D5, the other end of the bipolar TVS diode D5 is respectively connected with the other end of a resistor R22, the other end of a resistor R21, the other end of a resistor R29, the other end of the resistor R18 in the judging device and a pin 3 of a vehicle speed sensor U2 in the signal acquisition circuit and connected with the ground in parallel.

Technical Field

The invention relates to the field of agricultural machinery detection, in particular to a harvesting detection device of a combined harvester based on cloud.

Background

The "cloud" is a technology which has been raised and prosperous in recent years, and gradually spreads in various directions, such as the agricultural field. Agricultural mechanical equipment such as a combine harvester applied to the field is dispatched, and the purpose of reasonably distributing the resources of the agricultural mechanical equipment is achieved. With the development of the technology, a wheat combine harvester is designed for harvesting wheat, a corn harvester is designed for corn, a sorghum harvester is designed for sorghum, and the like, wherein the wheat harvester is similar to other crop harvesters.

However, in the actual harvesting process, the wheat harvesting is very easily affected by the operation environment, wherein the speed of the combined harvester is greatly affected, if a driver is in a hurry to complete the harvesting operation, the combined harvester is started quickly, the gap between the concave plates is too large, the wheat ears at the grass discharge position cannot be threshed completely, the harvesting of crops such as wheat by the combined harvester is further affected, and when the situation occurs, the driver only stops the combined harvester to readjust the gap between the concave plates and process the wheat ears at the grass discharge position, and then the harvesting process of the combined harvester on the crops is affected.

The present invention therefore provides a new solution to this problem.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a harvesting detection device of a cloud-based combine harvester, which effectively solves the problem that the harvesting of crops such as wheat and the like is influenced by the combine harvester due to overlarge gap between concave plates and too fast speed in the prior art.

The technical scheme of its solution is, a combine harvester reaps detection device based on cloud, detection device includes signal acquisition circuit, signal processing circuit, the signal acquisition circuit utilizes range sensor U1 and vehicle speed sensor U2 to gather the distance signal in concave plate clearance and combine harvester's vehicle speed signal respectively, and the distance signal and the vehicle speed signal of gathering export to signal processing circuit, signal processing circuit switches on the transmitter after judging distance signal and vehicle speed signal through judger, and the transmitter produces alarm signal to alarm signal output to ECU.

Furthermore, the signal acquisition circuit comprises a distance measurement sensor U1 and a vehicle speed sensor U2, the distance measurement sensor U1 and the vehicle speed sensor U2 are used by the signal acquisition circuit to respectively acquire a distance signal of a concave plate gap and a vehicle speed signal of the combine harvester, the distance signal is filtered and then transmitted to the signal processing circuit, and the vehicle speed signal is then output to the signal processing circuit.

Furthermore, the signal acquisition circuit comprises a distance measurement sensor U1 and a vehicle speed sensor U2, wherein a pin 1 of the distance measurement sensor U1 is respectively connected with the upper end of a resistor R3, the adjustable end of a resistor R3, the drain of a field effect transistor Q1, a pin 1 of the vehicle speed sensor U2 and is connected with a positive power supply VCC, a pin 2 of the distance measurement sensor U1 is respectively connected with one end of a capacitor C1 and one end of a resistor R1, the other end of a resistor R1 is respectively connected with one end of a resistor R27, one end of a capacitor C2 and the grid of a field effect transistor Q1, the source of the field effect transistor Q1 is respectively connected with one end of a resistor R2 and one end of a resistor R637, the other end of a resistor R27 is connected with the lower end of a resistor R3, the other end of an electrical fault R3 is connected with the same-phase end of an operational amplifier U3 3, the inverting end of the operational amplifier U3 3 is connected with one end of the resistor R3, the other end of the operational amplifier U3 is connected with the output end of the operational amplifier U3 3, and the other end of the capacitor C72 is connected with the other end of the capacitor C72, The other end of the capacitor C1, a pin 3 of the ranging sensor U1 and a pin 3 of the vehicle speed sensor U2 are connected in parallel and grounded, a pin 2 of the vehicle speed sensor U2 is connected with one end of a resistor R16, the other end of the resistor R16 is connected with the non-inverting end of the operational amplifier U5A, the inverting end of the operational amplifier U5A is connected with one end of the resistor R14, and the other end of the resistor R14 is connected with the output end of the operational amplifier U5A.

Further, the signal processing circuit comprises a judger and a transmitter, the judger receives the distance signal and the vehicle speed signal transmitted by the signal acquisition circuit, the distance signal is judged by the judger and then output to the transmitter, the vehicle speed signal is judged by the judger and then output to the transmitter at a high level, the transmitter generates an alarm signal by using the distance signal and the high level, and the alarm signal is transmitted to the ECU.

Further, the determiner includes an operational amplifier U4A and an operational amplifier U6A, a non-inverting terminal of the operational amplifier U4A is connected to one terminal of a resistor R28, the other terminal of the resistor R28 is connected to an anode of the thyristor Q5, the other terminal of the resistor R5 in the signal acquisition circuit, and an output terminal of the operational amplifier U3A, an inverting terminal of the operational amplifier U4A is connected to one terminal of a bipolar TVS diode D1, one terminal of the resistor R7, and a lower terminal of the resistor R6, an upper terminal of the resistor R6 is connected to one terminal of a resistor R8, an emitter of the triode Q4, an adjustable terminal of the resistor R6, one terminal of the resistor R6, and one terminal of a positive polarity power source VCC, an output terminal of the operational amplifier U4 6 is connected to the other terminal of the resistor R6, a base of the triode Q6, the other terminal of the bipolar diode D6, one terminal of the triode R6, and a negative electrode of the collector of the triode Q6 are connected to the voltage regulator R6, the other end of the resistor R26 is connected with one end of a capacitor C3, the other end of the resistor R10 is connected with the base of a triode Q3, the collector of the triode Q3 is respectively connected with the other end of a resistor R9, a pitch adjuster and the control electrode of a thyristor Q5, the emitter of the triode Q3 is connected with one end of a resistor R11, the other end of a resistor R11 is respectively connected with the other end of a capacitor C3, the lower end of a resistor R15 and one end of a resistor R18 and is grounded in parallel, the upper end of a resistor R15 is respectively connected with the other end of a resistor R13, the adjustable end of a resistor R15 and the non-inverting end of an operational amplifier U6A, the inverting end of the operational amplifier U6A is connected with one end of a bipolar TVS diode D3, the other end of the bipolar TVS diode D3 is respectively connected with one end of the resistor R3 and the output end of the operational amplifier U6 3, the other end of the resistor R3 is connected with the base of the collector of the triode Q3 and the negative electrode of the voltage regulator D3, the positive electrode of the voltage regulator tube D8 is connected with the speed reducer, and the emitting electrode of the triode Q2 is connected with the other end of the resistor R18.

Further, the transmitter comprises a resistor R12, one end of a resistor R12 is connected with the cathode of a thyristor Q5 in the interpreter, the other end of the resistor R12 is connected with the in-phase end of an operational amplifier U7A, the inverting end of the operational amplifier U7A is connected with one end of a resistor R20 and one end of a resistor R21 respectively, the output end of the operational amplifier U7A is connected with the other end of a resistor R20 and the anode of a diode D6 respectively, the cathode of a diode D6 is connected with the cathode of a diode D4, one end of a resistor R22 and one end of a resistor R23 respectively, the anode of a diode D4 is connected with one end of a resistor R19, the other end of the resistor R19 is connected with the cathode of a voltage stabilizing tube D8 in the interpreter and a speed reducer respectively, the other end of a resistor R23 is connected with the in-phase end of an operational amplifier U8A, the inverting end of an operational amplifier U8A is connected with one end of an ECU 24 and one end of a resistor R29 and the output end of an operational amplifier U24 and the output end of an operational amplifier U8A respectively, One end of the bipolar TVS diode D5 and the other end of the bipolar TVS diode D5 are connected to the other end of the resistor R22, the other end of the resistor R21, the other end of the resistor R29, the other end of the resistor R18 in the determiner, and the 3-pin of the vehicle speed sensor U2 in the signal acquisition circuit, and are connected to ground.

The invention realizes the following beneficial effects:

(1) the distance sensor U1 and the vehicle speed sensor U2 are arranged to collect a distance signal of a gap of the concave plate and a vehicle speed signal of the combine harvester respectively, a judging device is arranged to accurately judge the distance signal from the vehicle speed signal, and the distance of the gap of the concave plate and the vehicle speed of the combine harvester are adjusted simultaneously, so that the situation that the combine harvester is started quickly and the wheat ears at the grass discharging position cannot be threshed completely due to the fact that the distance of the gap of the concave plate is too large, and the situation that the combine harvester harvests crops such as wheat is influenced is avoided;

(2) the distance signal is filtered and compensated by the filter, loss caused by filtering of the distance signal is avoided, the situation that a rear-stage circuit cannot accurately judge the distance signal is caused, the output alarm signal is amplified by the transmitter, and the situation that the alarm signal received by the ECU is too weak and cannot be analyzed due to the existence of multipath fading when the alarm signal is transmitted in the field is avoided.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

The foregoing and other technical and other features and advantages of the invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

The utility model provides a detection device is reaped to combine based on cloud uses on the combine, detection device includes signal acquisition circuit, signal processing circuit, the signal acquisition circuit utilizes range sensor U1 and vehicle speed sensor U2 to gather the distance signal in concave plate clearance and the vehicle speed signal of combine respectively, and the distance signal and the vehicle speed signal of gathering export to signal processing circuit, signal processing circuit switches on the transmitter after judging distance signal and vehicle speed signal through judger, and the transmitter produces alarm signal to alarm signal output to ECU.

The signal acquisition circuit comprises a distance measurement sensor U1 and a vehicle speed sensor U2, the distance measurement sensor U1 and the vehicle speed sensor U2 are used by the signal acquisition circuit for respectively acquiring a distance signal of a gravure gap and a vehicle speed signal of the combine harvester, the infrared distance measurement sensor with the model similar to ORA1S01 is adopted by the distance measurement sensor U1, the speed sensor with the model similar to LZDSL3-970 is adopted by the vehicle speed sensor, the two sensors adopt the prior art, and are not described herein, the acquired distance signal is filtered through a resistor R1, a capacitor C1 and a capacitor C2, clutter in the distance signal is filtered, loss is caused by filtering the distance signal, so that a rear-stage circuit cannot accurately judge the distance signal, the distance signal is amplified by using a field effect tube Q1, the amplitude of the distance signal is amplified to the amplitude when the distance signal is not filtered, namely, compensation of the distance signal is realized, the distance signal is followed and then transmitted to the signal processing circuit through the operational amplifier U3A, the operational amplifier U3A follows the distance signal to improve the driving capability and the corresponding capability of the distance signal, the vehicle speed signal is transmitted to the operational amplifier U5A through the resistor R16 to follow, like the distance signal, the capability and the corresponding capability of the vehicle speed signal are improved, and the vehicle speed signal is also transmitted to the signal processing circuit;

the signal acquisition circuit comprises a distance measurement sensor U1 and a vehicle speed sensor U2, wherein a pin 1 of the distance measurement sensor U1 is respectively connected with the upper end of a resistor R3, the adjustable end of a resistor R3, the drain electrode of a field-effect tube Q1 and a pin 1 of the vehicle speed sensor U2 and is connected with a positive power supply VCC, a pin 2 of the distance measurement sensor U1 is respectively connected with one end of a capacitor C1 and one end of a resistor R1, the other end of a resistor R1 is respectively connected with one end of a resistor R27, one end of a capacitor C2 and the grid electrode of a field-effect tube Q1, the source electrode of the field-effect tube Q1 is respectively connected with one end of a resistor R2 and one end of a resistor R4, the other end of a resistor R27 is connected with the lower end of a resistor R3, the other end of an electric fault R3 is connected with the in-phase end of an operational amplifier U3 3, the inverted end of the operational amplifier U3 3 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with the output end of an operational amplifier U3 3, and the other end of the capacitor C3 is connected with the output end of the capacitor C3, The other end of the capacitor C1, a pin 3 of the ranging sensor U1 and a pin 3 of the vehicle speed sensor U2 are connected in parallel and grounded, a pin 2 of the vehicle speed sensor U2 is connected with one end of a resistor R16, the other end of the resistor R16 is connected with the non-inverting end of the operational amplifier U5A, the inverting end of the operational amplifier U5A is connected with one end of the resistor R14, and the other end of the resistor R14 is connected with the output end of the operational amplifier U5A.

The signal processing circuit comprises a determiner and a transmitter, wherein the determiner receives a distance signal by a resistor R28, receives a vehicle speed signal by a diode D2, the distance signal is transmitted to an operational amplifier U4A to be compared with a first standard signal, the vehicle speed signal is transmitted to an operational amplifier U5A to be compared with a second standard signal, the first standard signal is a distance signal of a concave gap arranged in a wheat field at the previous position of the harvester and provided by a resistor R6 and a resistor R7 in a voltage division mode, the second distance signal is a normal vehicle speed signal of the combine harvester and provided by a resistor R13 and a resistor R15 in a voltage division mode, when the operational amplifier U4A outputs a low level to conduct a transistor Q4, the distance of the concave gap does not need to be changed, a high voltage output by the transistor Q4 is discharged to the ground by a voltage regulator D7, a resistor R26 and a capacitor C3, and when the operational amplifier U4A outputs a high level to conduct the transistor Q3, the distance of the gravure gap needs to be adjusted, the triode Q3 conducts the distance adjuster to further adjust the distance of the gravure gap, the triode Q3 conducts the thyristor Q5, the thyristor Q5 transmits a distance signal to the transmitter, when the triode Q2 is not conducted by the output result of the operational amplifier U6A, the speed of the combine harvester is in a normal state, speed reduction processing is not needed, when the triode Q2 is conducted by the output result of the operational amplifier U6A, the speed of the combine harvester is higher, the speed of the combine harvester is not in a normal speed, harvesting of wheat and other crops by the combine harvester is affected, the triode Q2 turns on the speed reducer through the voltage stabilizing tube D8 to decelerate the combine harvester, harvesting work of the combine harvester is avoided being affected, the speed signal is transmitted to the transmitter, the transmitter receives the distance signal and the speed signal by the operational amplifier U7A and the resistor R19 respectively, the distance signal is amplified by an operational amplifier U7A and then transmitted to a diode D6, a diode D4 receives a vehicle speed signal, an OR gate consisting of the diode D6, the diode D4 and a resistor R22 receives the distance signal or the vehicle speed signal or both the distance signal and the vehicle speed signal, the OR gate outputs a high level, the high level is used as an alarm signal and is transmitted to an ECU to remind a driver, the driver is reminded to reduce the vehicle speed of the combine harvester or adjust the distance of a gravure gap in order to ensure the harvesting efficiency, the alarm signal is amplified by the operational amplifier U8A at the moment, the surge phenomenon is inhibited by a bipolar TVS diode D5, and the safety of the transmitter is further ensured;

the determiner comprises an operational amplifier U4A and an operational amplifier U6A, wherein the non-inverting terminal of the operational amplifier U4A is connected with one end of a resistor R28, the other end of the resistor R28 is respectively connected with the anode of a thyristor Q5, the other end of a resistor R5 in the signal acquisition circuit and the output end of an operational amplifier U3A, the inverting terminal of the operational amplifier U4A is respectively connected with one end of a bipolar TVS diode D1, one end of a resistor R7 and the lower end of a resistor R6, the upper end of the resistor R6 is respectively connected with one end of a resistor R8, the emitter of a triode Q4, the adjustable end of a resistor R6, one end of the resistor R6 and one end of a positive polarity power supply VCC, the output end of the operational amplifier U4 6 is respectively connected with the other end of the resistor R6, the base of the triode Q6, the other end of the bipolar TVS diode D6 and one end of a collector of the resistor R6, the negative electrode of the triode Q6 is connected with a voltage regulator 6, the other end of the resistor R26 is connected with one end of a capacitor C3, the other end of the resistor R10 is connected with the base of a triode Q3, the collector of the triode Q3 is respectively connected with the other end of a resistor R9, a pitch adjuster and the control electrode of a thyristor Q5, the emitter of the triode Q3 is connected with one end of a resistor R11, the other end of a resistor R11 is respectively connected with the other end of a capacitor C3, the lower end of a resistor R15 and one end of a resistor R18 and is grounded in parallel, the upper end of a resistor R15 is respectively connected with the other end of a resistor R13, the adjustable end of a resistor R15 and the non-inverting end of an operational amplifier U6A, the inverting end of the operational amplifier U6A is connected with one end of a bipolar TVS diode D3, the other end of the bipolar TVS diode D3 is respectively connected with one end of the resistor R3 and the output end of the operational amplifier U6 3, the other end of the resistor R3 is connected with the base of the collector of the triode Q3 and the negative electrode of the voltage regulator D3, the positive electrode of the voltage regulator tube D8 is connected with the speed reducer, and the emitting electrode of the triode Q2 is connected with the other end of the resistor R18;

the transmitter comprises a resistor R12 and a resistor R19, one end of the resistor R12 is connected with the cathode of a thyristor Q5 in the interpreter, the other end of the resistor R12 is connected with the in-phase end of an operational amplifier U7A, the inverting end of the operational amplifier U7A is respectively connected with one end of a resistor R20 and one end of a resistor R21, the output end of the operational amplifier U7A is respectively connected with the other end of a resistor R20 and the anode of a diode D6, the cathode of the diode D6 is respectively connected with the cathode of a diode D4, one end of a resistor R22 and one end of a resistor R23, the anode of the diode D23 is connected with one end of a bipolar resistor R23, the other end of the resistor R23 is respectively connected with the cathode of a voltage stabilizing tube D23 and a speed reducer in the interpreter, the other end of the resistor R23 is connected with the in-phase end of the operational amplifier U8 23, the inverting end of the diode R23 is respectively connected with one end of the diode R23 and the output end of the TVS 23, the other end of the bipolar TVS diode D5 is connected to the other end of the resistor R22, the other end of the resistor R21, the other end of the resistor R29, the other end of the resistor R18 in the determiner, and the 3-pin of the vehicle speed sensor U2 in the signal acquisition circuit, and is connected to ground.

When the invention is used, the detection device comprises a signal acquisition circuit and a signal processing circuit, wherein the signal acquisition circuit comprises a distance measurement sensor U1 and a vehicle speed sensor U2, the signal acquisition circuit respectively acquires a distance signal of a concave board gap and a vehicle speed signal of a combine harvester by using the distance measurement sensor U1 and the vehicle speed sensor U2, the acquired distance signal is filtered by a resistor R1, a capacitor C1 and a capacitor C2 and is amplified by using a field effect tube Q1, the distance signal is followed by an operational amplifier U3A and then transmitted to the signal processing circuit, the vehicle speed signal is transmitted to an operational amplifier U5A by a resistor R16 and is followed and transmitted to the signal processing circuit, the signal processing circuit comprises a judger and a transmitter, the judger receives the distance signal by using a resistor R28, receives the vehicle speed signal by using a diode D2, the distance signal is transmitted to an operational amplifier U4A and is compared with a first standard signal, the vehicle speed signal is transmitted to an operational amplifier U5A to be compared with a second standard signal, when an operational amplifier U4A outputs a low level to conduct a triode Q4, at the moment, high voltage output by the triode Q4 is discharged to the ground through a voltage stabilizing tube D7, a resistor R26 and a capacitor C3, when the operational amplifier U4A outputs a high level to conduct the triode Q3, the distance of a concave plate gap needs to be adjusted, at the moment, a triode Q3 conducts a distance adjuster, the distance of the concave plate gap is adjusted, meanwhile, the triode Q3 conducts a thyristor Q5, the thyristor Q5 transmits the distance signal to a transmitter, when the result output by the operational amplifier U6A conducts the triode Q2, the situation that the speed of the combine harvester is higher and not in a normal vehicle speed at the moment, the harvesting of crops such as wheat is influenced, at the moment, the triode Q2 turns on a speed reducer through a voltage stabilizing tube D8 to decelerate the combine harvester, the harvesting work of the combine harvester is prevented from being influenced, a vehicle speed signal is transmitted to a transmitter, the transmitter transmits a distance signal to a diode D6 after amplifying the distance signal by an operational amplifier U7A, the diode D4 receives the vehicle speed signal, an OR gate consisting of the diode D6, the diode D4 and a resistor R22 receives the distance signal or the vehicle speed signal or both the distance signal and the vehicle speed signal, the OR gate outputs a high level, the high level is used as an alarm signal and transmitted to an ECU to remind a driver, the driver is reminded to reduce the vehicle speed of the combine harvester or adjust the distance of a gravure gap in order to ensure the harvesting efficiency, in order to avoid the phenomenon that the alarm signal received by the ECU is too weak to be analyzed due to large attenuation caused by multipath fading when the alarm signal is transmitted in the field, the operational amplifier U8A is used for amplifying the alarm signal, and a bipolar TVS diode D5 is used for inhibiting the phenomenon, the safety of the transmitter is further ensured.

The distance sensor U1 and the vehicle speed sensor U2 are arranged to collect a distance signal of a concave board gap and a vehicle speed signal of the combine harvester respectively, a judger is arranged to accurately judge the distance signal from the vehicle speed signal, and simultaneously the distance of the concave board gap and the vehicle speed of the combine harvester are adjusted, so that the situation that the combine harvester is started quickly, the distance of the concave board gap is too large, wheat ears at a grass arrangement position cannot be threshed completely, the situation that the combine harvester harvesters crops such as wheat and the like is influenced is avoided, the distance signal is filtered and compensated by a filter, the situation that the distance signal is filtered to cause loss, the situation that a rear-stage circuit cannot accurately judge the distance signal is caused is avoided, the output alarm signal is amplified by a transmitter, and the situation that the alarm signal is transmitted in a field due to multipath fading is avoided, leading to the occurrence of a situation in which the alarm signal received by the ECU is too weak to be analyzed.