阅读说明：本技术 一种基于云调度的联合收获机检测装置 (Combine harvester detection device based on cloud scheduling ) 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调度的联合收获机检测装置,有效的解决了驾驶员驾驶员没有注意到割台被麦秆堵塞,进而导致联合收获机对小麦的收割效率大打折扣的情况发生。本发明的检测装置包括信号采集电路、信号输出电路,所述信号采集电路利用测距传感器U1采集动刀片和定刀片之间的距离信号,采集到的距离信号经滤波器和判断器后传输至信号输出电路,所述信号输出电路利用信号采集电路发送过来的近距离信号产生报警信号,并将报警信号输出至ECU,并将报交警信号输出至ECU,提高了利用联合收获机收割小麦时的收割效率。(The invention discloses a combine harvester detection device based on cloud scheduling, which effectively solves the problem that a driver does not notice that a header is blocked by wheat straws, so that the combine harvester is greatly discounted in the wheat harvesting efficiency. The detection device comprises a signal acquisition circuit and a signal output circuit, wherein the signal acquisition circuit acquires a distance signal between the movable blade and the fixed blade by using a distance measuring sensor U1, the acquired distance signal is transmitted to the signal output circuit after passing through a filter and a judger, the signal output circuit generates an alarm signal by using a close-range signal sent by the signal acquisition circuit, the alarm signal is output to an ECU, and the alarm signal is output to the ECU, so that the harvesting efficiency when the wheat is harvested by using the combine harvester is improved.)

1. The utility model provides a combine detection device based on cloud scheduling, a serial communication port, detection device includes signal acquisition circuit, signal output circuit, signal acquisition circuit utilizes range finding sensor U1 to gather the distance signal between moving blade and the stationary blade, and the distance signal who gathers transmits to signal output circuit behind wave filter and the judgement ware, signal output circuit utilizes the close range signal that signal acquisition circuit sent and comes to produce alarm signal to with alarm signal output to ECU.

2. The combine harvester detection device based on cloud scheduling of claim 1, wherein the signal acquisition circuit comprises a distance measurement sensor U1, a filter and a determiner, the filter receives and filters the distance signal acquired by the distance measurement sensor U1 between the movable blade and the fixed blade, the filtered distance signal is determined by the determiner and is transmitted to the signal output circuit.

3. The cloud scheduling-based combine harvester detection device as claimed in claim 2, wherein the filter comprises a capacitor C1, one end of the capacitor C1 is connected to one end of a resistor R1 and 2 pins of a distance measurement sensor U1, the other end of a resistor R1 is connected to one end of a resistor R3 and a gate of a fet Q1 at one end of a capacitor C2, a drain of the fet Q1 is connected to an adjustable end of a resistor R2, an upper end of a resistor R2, a pin 1 of the distance measurement sensor U1, one end of a resistor R8 is connected to a positive power VCC, the other end of the resistor R3 is connected to a lower end of a resistor R2, a source of the fet Q1 is connected to one end of a resistor R5 and one end of a resistor R4, the other end of the resistor R5 is connected to one end of a resistor R6, one end of a resistor R7, a base of a transistor Q2, a collector of a transistor Q2 is connected to a base of a transistor Q3, an emitter of the triode Q3 is connected with the other end of the resistor R8, and a collector of the triode Q3 is connected with an emitter of the triode Q2, the other end of the resistor R7, the other end of the resistor R4, the other end of the capacitor C2, the other end of the capacitor C1 and a pin 3 of the distance measuring sensor U1 and is connected with the ground.

4. The cloud scheduling-based combine harvester detection device as claimed in claim 2, wherein the determiner includes a resistor R9, one end of the resistor R9 is connected to the anode of the thyristor Q5 and the emitter of the transistor Q3 in the filter, the other end of the resistor R9 is connected to the non-inverting terminal of the operational amplifier U2A, the inverting terminal of the operational amplifier U2A is connected to one end of the bipolar TVS diode D1, one end of the resistor R10, the lower end of the resistor R11 and the adjustable terminal of the resistor R11, the upper end of the resistor R11 is connected to one end of the resistor R14, the emitter of the transistor Q4, one end of the resistor R12 and one end of the resistor R8 in the filter, the output terminal of the operational amplifier U2A is connected to the other end of the resistor R12, the base of the transistor Q4, the other end of the bipolar diode D1 and one end of the resistor R15, and the base of the resistor R15 is connected to the base of the transistor Q6, the collector of the triode Q6 is connected with one end of a resistor R14, the emitter of the triode Q6 is connected with the anode of a voltage regulator tube D2, the cathode of the voltage regulator tube D2 is connected with one end of a resistor R16, the other end of the resistor R16 is connected with one end of a capacitor C4, the other end of the capacitor C4 is respectively connected with one end of a resistor R13, the other end of the resistor R10 and the other end of a resistor R4 in the filter and is connected with the ground in parallel, the other end of the resistor R13 is respectively connected with the control electrode of a collector thyristor Q5 of the triode Q4, and the cathode of the thyristor Q5 is connected with one end of a resistor R17.

5. The combine harvester detection device based on cloud scheduling of claim 1, wherein the signal output circuit receives the distance signal transmitted by the signal acquisition circuit, generates the alarm signal by using the distance signal, amplifies the alarm signal and transmits the amplified alarm signal to the ECU.

6. The cloud scheduling-based combine harvester detection device as claimed in claim 5, wherein the signal output circuit comprises a diode D5, the cathode of the diode D5 is connected to the other end of a resistor R17 in the signal acquisition circuit, the anode of the diode D5 is connected to one end of a resistor R20, the cathode of a diode D3 and one end of a resistor R21, the cathode of the diode D3 is connected to one end of a resistor R18, the upper end of a resistor R19 and the adjustable end of a resistor R19, the lower end of a resistor R19 is connected to one end of a resistor R26, one end of a bipolar TVS diode D4, one end of a resistor R22 and the other end of a resistor R4 in the signal acquisition circuit and is grounded, the other end of a resistor R18 is connected to the other end of the resistor R20 and the 1 pin of a distance sensor U1 in the signal acquisition circuit and is connected to a power source VCC, the other end of a resistor R21 is connected to the non-inverting terminal of the operational U3A, the reverse end of the operational amplifier U3A is connected to the other end of the resistor R22 and one end of the resistor R23 respectively, the other end of the resistor R23 is connected to the output end of the operational amplifier U3A and the anode of the secondary roller D6 respectively, the cathode of the diode D6 is connected to one end of the resistor R25 and the distance adjusting plate respectively, the other end of the resistor R25 is connected to the same-phase end of the operational amplifier U4A, the reverse end of the operational amplifier U4A is connected to the other end of the resistor R26 and one end of the resistor R27 respectively, and the other end of the resistor R27 is connected to the output end of the operational amplifier U4A, the other end of the bipolar TVS diode D4 and the ECU.

Technical Field

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

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, the wheat harvester is similar to other crop harvesters, and the aim of achieving high-quality harvesting of crops such as wheat and barley becomes a long-time effort of people is achieved.

However, when the combined harvester based on cloud scheduling enters a field to harvest wheat, a driver needs to pay attention to whether the distance between the movable blade and the fixed blade of the combined harvester is too large, the situation that the header of the combined harvester is blocked by wheat straws is caused if the distance between the movable blade and the fixed blade is too large, and the situation that a grower needs to harvest wheat manually is caused if the driver does not notice that the header is blocked.

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 combine harvester detection device based on cloud scheduling, which effectively solves the problem that a driver does not notice that a header is blocked by wheat straws, so that the combine harvester is greatly discounted in the wheat harvesting efficiency.

The technical scheme of its solution is, a combine detection device based on cloud scheduling, detection device includes signal acquisition circuit, signal output circuit, signal acquisition circuit utilizes range finding sensor U1 to gather the distance signal between moving blade and the stationary blade, and the distance signal who gathers transmits to signal output circuit behind wave filter and the judgement ware, signal output circuit utilizes the close range signal that signal acquisition circuit sent and comes to produce alarm signal to with alarm signal output to ECU.

Further, the signal acquisition circuit comprises a distance measurement sensor U1, a filter and a judger, the filter receives and filters a distance signal acquired by the distance measurement sensor U1 between the movable blade and the fixed blade, the filtered distance signal is judged by the judger, and the distance signal is transmitted to the signal output circuit.

Furthermore, the filter includes a capacitor C1, one end of the capacitor C1 is connected to one end of a resistor R1 and a 2 pin of the ranging sensor U1, the other end of the resistor R1 is connected to one end of a resistor R3 and a gate of a field effect transistor Q1 of the capacitor C2, a drain of the field effect transistor Q1 is connected to an adjustable end of a resistor R2, an upper end of the resistor R2, a1 pin of the ranging sensor U1 and one end of the resistor R8 and is connected to a positive power VCC, the other end of the resistor R3 is connected to a lower end of the resistor R2, a source of the field effect transistor Q1 is connected to one end of a resistor R5 and one end of a resistor R4, the other end of the resistor R5 is connected to one end of a resistor R6, one end of a resistor R7 and a base of a triode Q2, a collector of the triode Q2 is connected to a base of the triode Q3, an emitter of the triode Q3 is connected to the other end of the triode R8, and a collector of the triode Q3 is connected to an emitter of the triode Q2, The other end of the resistor R7, the other end of the resistor R4, the other end of the capacitor C2, the other end of the capacitor C1 and the 3 pins of the ranging sensor U1 are connected in parallel and connected with the ground.

Further, the determiner includes a resistor R9, one end of the resistor R9 is connected to the anode of the thyristor Q5 and the emitter of the transistor Q3 in the filter, the other end of the resistor R9 is connected to the non-inverting terminal of the operational amplifier U2A, the inverting terminal of the operational amplifier U2A is connected to one end of the bipolar TVS diode D1, one end of the resistor R10, the lower end of the resistor R11 and the adjustable terminal of the resistor R11, the upper end of the resistor R11 is connected to one end of the resistor R14, the emitter of the transistor Q4, one end of the resistor R12 and one end of the resistor R8 in the filter, and is connected to the positive power source VCC, the output end of the operational amplifier U2A is connected to the other end of the resistor R12, the base of the transistor Q4, the other end of the bipolar TVS diode D4 and one end of the resistor R4, the other end of the resistor R4 is connected to the base of the triode Q4, the emitter of the triode Q4 and the collector of the triode Q4, the cathode of the voltage regulator tube D2 is connected with one end of a resistor R16, the other end of the resistor R16 is connected with one end of a capacitor C4, the other end of the capacitor C4 is respectively connected with one end of a resistor R13, the other end of a resistor R10 and the other end of a resistor R4 in the filter and connected with the ground in parallel, the other end of the resistor R13 is respectively connected with the control electrode of a collector thyristor Q5 of a triode Q4, and the cathode of the thyristor Q5 is connected with one end of the resistor R17.

Furthermore, the signal output circuit receives the distance signal transmitted by the signal acquisition circuit, generates an alarm signal by using the distance signal, amplifies the alarm signal and transmits the amplified alarm signal to the ECU.

Further, the signal output circuit comprises a diode D5, the cathode of the diode D5 is connected with the other end of a resistor R17 in the signal acquisition circuit, the anode of the diode D5 is respectively connected with one end of the resistor R20, the cathode of the diode D3 and one end of a resistor R21, the cathode of the diode D3 is respectively connected with one end of the resistor R18, the upper end of the resistor R19 and the adjustable end of the resistor R19, the lower end of the resistor R19 is respectively connected with one end of the resistor R26, one end of a bipolar TVS diode D4, one end of the resistor R22 and the other end of a resistor R4 in the signal acquisition circuit and grounded, the other end of the resistor R18 is respectively connected with the other end of the resistor R20 and a pin 1 of a distance measurement sensor U1 in the signal acquisition circuit and connected with a positive power supply VCC, the other end of the resistor R21 is connected with the same phase end of an operational amplifier U3A, the reverse end of the operational amplifier U3A is respectively connected with the other end of the resistor R22 and one end of the resistor R23, the other end of the resistor R23 is connected with the output end of the operational amplifier U3A and the anode of the secondary roller D6 respectively, the cathode of the diode D6 is connected with one end of the resistor R25 and the distance adjusting plate respectively, the other end of the resistor R25 is connected with the same-phase end of the operational amplifier U4A, the reverse end of the operational amplifier U4A is connected with the other end of the resistor R26 and one end of the resistor R27 respectively, and the other end of the resistor R27 is connected with the output end of the operational amplifier U4A, the other end of the bipolar TVS diode D4 and the ECU respectively.

The invention realizes the following beneficial effects:

the distance signal between the movable blade and the fixed blade is collected by arranging the distance measuring sensor U1, the distance signal is judged by arranging the judging device, when the straw is clamped between the movable blade and the fixed blade, the distance signal is output to the signal output circuit, the signal output circuit is used for generating an alarm signal, the distance adjusting plate is opened, a driver is reminded to pay more attention to the header, the distance signal is filtered by the filter and then compensated, the phenomenon that the judging device loses due to filtering when judging the distance signal, the judging accuracy of the judging device on the distance signal is influenced, the occurrence of misjudgment is avoided, whether the straw is clamped between the movable blade and the fixed blade is collected by the signal collecting circuit, whether the whole header can be continuously used or not is judged by the signal output circuit, whether the header is completely blocked or not is judged, and the detection accuracy of the whole detection device is improved, the situation that the harvesting efficiency of the wheat is greatly reduced by the combined harvester is avoided, and the harvesting efficiency when the wheat is harvested by the combined harvester is improved.

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 combine detection device based on cloud scheduling, uses on the combine that reaps wheat, detection device includes signal acquisition circuit, signal output circuit, signal acquisition circuit utilizes range finding sensor U1 to gather the distance signal between knife blade and the stationary blade, and the distance signal who gathers transmits to signal output circuit behind wave filter and the judgement ware, signal output circuit utilizes the close range signal that signal acquisition circuit sent and comes to produce alarm signal to with alarm signal output to ECU.

The signal acquisition circuit comprises a distance measurement sensor U1, a filter and a judger, wherein the filter utilizes a resistor R1, a capacitor C1 and a capacitor C2 to carry out pi-type filtering on a distance signal between a movable blade and a fixed blade acquired by the distance measurement sensor U1, and filters noise waves in the distance signal, wherein the distance measurement sensor U1 adopts an infrared distance measurement sensor with a model similar to an ORA1S01 model, a field effect tube Q1 is utilized to follow the distance signal, so that the driving capability and the corresponding capability of the distance signal are improved, in order to avoid loss generation when the resistor R1, the capacitor C1 and the capacitor C2 carry out filtering on the distance signal and cause that the judger cannot accurately judge the amplitude of the distance signal, the triode Q2 and the triode Q3 are utilized to amplify the distance signal (the distance signal is amplified to the amplitude when the resistor R1, the capacitor C1 and the capacitor C2 carry out pi-type filtering), so as to form compensation for the distance signal and avoid the occurrence of inaccurate result generated when the distance signal is judged by the judger, the judger transmits the compensated distance signal to the operational amplifier U2A to be compared with a standard signal, the bipolar TVS diode D1 is used for accelerating the output of the operational amplifier U2A, the standard signal is a distance value signal between a movable blade and a fixed blade preset when the combine harvester enters a wheat field, when the operational amplifier U2A outputs a high level, namely the amplitude of the distance signal is higher than the amplitude of the standard signal, it indicates that no straw is clamped between the movable blade and the fixed blade, the cutting platform is not blocked by the straw, at the moment, the triode Q6 is conducted, the voltage stabilizing tube D2, the resistor R16 and the capacitor C4 discharge the high voltage generated by the triode Q6 to the ground, thereby avoiding the influence on the judger, and when the operational amplifier U2A outputs a low level, namely the amplitude of the distance signal is lower than the amplitude of the standard signal, the straw is clamped between the movable blade and the fixed blade, the header is blocked by the straw, the triode Q4 is conducted at the moment, the thyristor Q5 is conducted by the triode Q4, and the distance signal at the moment is output to the signal output circuit by the thyristor Q5;

the filter comprises a capacitor C1, one end of a capacitor C1 is respectively connected with one end of a resistor R1 and a pin 2 of a distance measuring sensor U1, the other end of the resistor R1 is respectively connected with one end of a resistor R3 and a gate of a field effect transistor Q1 at one end of a capacitor C2, a drain of the field effect transistor Q1 is respectively connected with an adjustable end of a resistor R2, an upper end of a resistor R2, a pin 1 of the distance measuring sensor U1 and one end of a resistor R8 and is connected with a positive power supply VCC, the other end of a resistor R3 is connected with a lower end of a resistor R2, a source of the field effect transistor Q1 is respectively connected with one end of the resistor R1 and one end of the resistor R1, the other end of the resistor R1 is respectively connected with one end of the resistor R1 and a base of a triode Q1, a collector of the triode Q1 is respectively connected with the other end of the triode Q1, an emitter of the triode Q1 is respectively connected with the other end of the triode Q1, The other end of the resistor R7, the other end of the resistor R4, the other end of the capacitor C2, the other end of the capacitor C1 and the 3 pins of the ranging sensor U1 are connected in parallel and connected with the ground;

the determiner comprises a resistor R9, one end of a resistor R9 is respectively connected with an anode of a thyristor Q5 and an emitter of a triode Q3 in the filter, the other end of a resistor R9 is connected with a non-inverting end of an operational amplifier U2A, a reverse end of the operational amplifier U2A is respectively connected with one end of a bipolar TVS diode D1, one end of a resistor R10, the lower end of a resistor R11 and an adjustable end of a resistor R11, the upper end of the resistor R11 is respectively connected with one end of a resistor R14, an emitter of a triode Q4, one end of a resistor R12 and one end of a resistor R8 in the filter are respectively connected with a positive power VCC, an output end of the operational amplifier U2A is respectively connected with the other end of the resistor R12, a base of a triode Q4, the other end of a TVS diode D1 and one end of a resistor R15, the other end of the resistor R15 is connected with a base of a triode Q6, a collector of a triode Q6 is connected with one end of a bipolar regulator Q14, an emitter of a triode Q6 is connected with a positive voltage regulator D2, the cathode of the voltage regulator tube D2 is connected with one end of a resistor R16, the other end of the resistor R16 is connected with one end of a capacitor C4, the other end of the capacitor C4 is respectively connected with one end of a resistor R13, the other end of a resistor R10 and the other end of a resistor R4 in the filter and connected with the ground in parallel, the other end of the resistor R13 is respectively connected with the control electrode of a collector thyristor Q5 of a triode Q4, and the cathode of the thyristor Q5 is connected with one end of the resistor R17.

The signal output circuit utilizes the diode D5 to receive the distance signal output by the signal acquisition circuit, the diode D3 receives other signals that the resistor R18 and the resistor R19 provide other signals for clamping wheat straws between other movable blades and fixed blades, the distance signal and the other signals conduct an AND gate circuit consisting of the diode D3, the diode D5 and the resistor R20 at the moment, the header cannot harvest wheat any more, otherwise, the harvesting efficiency is greatly reduced, the AND gate circuit consisting of the diode D3, the diode D5 and the resistor R20 outputs a high-level signal which is used as an alarm signal, the alarm signal utilizes the operational amplifier U3A to improve the driving capability and improve the capability of driving the distance adjusting plate, the alarm signal utilizes the diode D6 to start the distance adjusting plate to loosen the clamped wheat straws between the movable blades and the fixed blades, and simultaneously utilizes the resistor R25 to transmit the alarm signal to the operational amplifier U4A for amplification, when the alarm signal is wirelessly transmitted to the ECU, the alarm signal is greatly attenuated due to multipath fading, so that the ECU cannot receive the alarm signal or the alarm signal received by the ECU is too weak to analyze, a bipolar TVS diode D4 is used for avoiding the surge phenomenon of the ECU caused by the alarm signal, the alarm signal is transmitted to the ECU, and a driver is reminded that the straw is clamped by the movable blade and the fixed blade, the header is blocked by the straw, and the attention needs to be paid to the header;

the signal output circuit comprises a diode D5, the cathode of a diode D5 is connected with the other end of a resistor R17 in the signal acquisition circuit, the anode of the diode D5 is respectively connected with one end of a resistor R20, the cathode of a diode D3 and one end of a resistor R21, the cathode of a diode D3 is respectively connected with one end of the resistor R18, the upper end of a resistor R19 and the adjustable end of the resistor R19, the lower end of a resistor R19 is respectively connected with one end of the resistor R26, one end of a TVS diode D4, one end of a resistor R22 and the other end of a resistor R4 in the signal acquisition circuit and grounded, the other end of a resistor R18 is respectively connected with the other end of the resistor R20 and a pin 1 of a distance measurement sensor U1 in the signal acquisition circuit and is connected with a positive polarity power supply VCC, the other end of a resistor R21 is connected with the same phase end of an operational amplifier U3A, the reverse end of an operational amplifier U3A is respectively connected with the other end of the resistor R22 and one end of the resistor R23, the other end of the resistor R23 is connected with the output end of the operational amplifier U3A and the anode of the secondary roller D6 respectively, the cathode of the diode D6 is connected with one end of the resistor R25 and the distance adjusting plate respectively, the other end of the resistor R25 is connected with the same-phase end of the operational amplifier U4A, the reverse end of the operational amplifier U4A is connected with the other end of the resistor R26 and one end of the resistor R27 respectively, and the other end of the resistor R27 is connected with the output end of the operational amplifier U4A, the other end of the bipolar TVS diode D4 and the ECU respectively.

When the invention is used, the signal acquisition circuit comprises a distance measurement sensor U1, a filter and a judger, wherein the filter utilizes a resistor R1, a capacitor C1 and a capacitor C2 to carry out pi-type filtering on a distance signal acquired by the distance measurement sensor U1, noise waves in the distance signal are filtered, a field effect tube Q1 is utilized to carry out following processing on the distance signal, a triode Q2 and a triode Q3 are utilized to amplify the distance signal so as to avoid the occurrence of inaccurate result generated when the distance signal is judged by the judger, the judger transmits the compensated distance signal to an operational amplifier U2A to be compared with a standard signal, when the operational amplifier U2A outputs high level, namely the amplitude of the distance signal is higher than that of the standard signal, the wheat straw is not clamped between the movable blade and the fixed blade, the triode Q6 is conducted at the moment, a voltage stabilizing tube D2, the resistor R16 and the capacitor C4 discharge the high voltage generated by the triode Q6 to the ground, the influence on the judger is avoided, when the operational amplifier U2A outputs a low level, namely the amplitude of the distance signal is lower than that of the standard signal, the wheat straw is clamped between the movable blade and the fixed blade, the triode Q4 is conducted at the moment, the triode Q4 conducts the thyristor Q5, the thyristor Q5 outputs the distance signal at the moment to the signal output circuit, the signal output circuit utilizes the diode D5 to receive the distance signal, the diode D3 receives other signals that the resistor R18 and the resistor R19 provide clamping of the wheat straw between other movable blades and the fixed blade, the distance signal and other signals conduct an AND gate circuit formed by the diode D3, the diode D5 and the resistor R20 to output an alarm signal, the alarm signal utilizes the operational amplifier U3A to improve the driving capability and improve the capability of driving the distance adjusting plate, the alarm signal utilizes the diode D6 to start the distance adjusting plate to release the clamped wheat straw between the movable blade and the fixed blade, meanwhile, the resistor R25 is used for transmitting the alarm signal to the operational amplifier U4A for amplification, so that the situation that the alarm signal cannot be received by the ECU or cannot be analyzed due to the fact that the alarm signal is too weak due to large-amplitude attenuation caused by multipath fading when the alarm signal is wirelessly transmitted to the ECU is avoided, and a driver is reminded that the movable blade and the fixed blade clamp wheat straws, and attention needs to be paid to the movable blade and the fixed blade.

The distance signal between the movable blade and the fixed blade is collected by arranging the distance measuring sensor U1, the distance signal is judged by arranging the judging device, when the straw is clamped between the movable blade and the fixed blade, the distance signal is output to the signal output circuit, the signal output circuit is used for generating an alarm signal, the distance adjusting plate is opened, the driver is reminded to pay more attention to the ear picking disc, the distance signal is filtered by the filter and then compensated, the loss caused by filtering when the judging device judges the distance signal is avoided, the accuracy of the judgment of the distance signal by the judging device is further influenced, the occurrence of misjudgment is avoided, whether the straw is clamped between the movable blade and the fixed blade is collected by the signal collecting circuit, whether the whole header can be continuously used or not is judged by the signal output circuit, whether the header is completely blocked or not, and the detection accuracy of the whole detection device is improved, the situation that the harvesting efficiency of the wheat is greatly reduced by the combined harvester is avoided, and the harvesting efficiency when the wheat is harvested by the combined harvester is improved.