Crane motor temperature alarm circuit

Abstract

The utility model discloses a crane motor temperature alarm circuit, which relates to the technical field of motor temperature alarm, and comprises a temperature detection module for detecting the temperature of a crane motor and calculating the temperature change degree in a short time when the temperature reaches a set temperature, when the temperature difference is larger than a set temperature difference threshold value, there is an over-temperature risk, at the moment, the alarm control module carries out light alarm, the over-temperature detection module carries out over-temperature detection, and when the temperature is over-temperature, the alarm control module carries out sound alarm. When the crane motor is over-temperature and the temperature difference is larger than a set temperature difference threshold value, sound alarm is maintained, the alarm control module transmits the alarm state to the monitoring terminal in a wireless mode, the crane motor temperature alarm circuit can conduct over-temperature alarm in advance, the over-temperature risk is reduced, alarm with different effects can be conducted according to different temperature states, and the safety of the crane motor is improved. The alarm effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor temperature alarm technology, specifically a crane motor temperature alarm circuit. Background Technology

[0002] A crane is a multi-action lifting machine that vertically lifts and horizontally moves heavy objects within a certain range. It is mainly used for loading and unloading operations of goods and bulk materials in freight yards and material yards. In existing technologies, crane motors are prone to overheating due to excessive load when lifting heavy objects. To continuously monitor the temperature of the crane motor and issue over-temperature alarms, current crane motor technology typically uses a temperature alarm circuit composed of a comparator, a thermistor, a relevant over-temperature reference power supply, and an alarm. While this circuit can detect temperature and issue over-temperature alarms, it cannot predict temperature anomalies in advance and cannot provide different alarms based on the temperature condition. Therefore, the temperature alarm effect is low and needs improvement. Utility Model Content

[0003] This utility model provides a crane motor temperature alarm circuit to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A crane motor temperature alarm circuit includes: a power supply module, a temperature detection module, an over-temperature detection module, a temperature difference detection module, an anomaly judgment module, and an alarm control module.

[0006] The power module is used to connect to DC power.

[0007] The temperature detection module, connected to the power supply module, is used to receive DC power and detect the temperature of the starter motor, output a temperature signal, and output a control signal when the temperature signal is greater than the set temperature threshold.

[0008] The over-temperature detection module is connected to the power supply module and the temperature detection module. It is used to receive the first electrical energy and output the first alarm signal when the temperature signal is greater than the set over-temperature threshold.

[0009] The temperature difference detection module, connected to the temperature detection module and the power supply module, is used to store temperature signals and perform time delay and hold processing on the temperature signals. When a control signal is received, it receives DC power and subtracts the real-time received temperature signal from the time-delayed signal to obtain the temperature difference signal.

[0010] The anomaly detection module, connected to the temperature difference detection module, is used to output a second alarm signal when the temperature difference signal is greater than the set temperature difference threshold.

[0011] The alarm control module, connected to the over-temperature detection module, the anomaly judgment module, and the power supply module, is used to receive DC power. When a second alarm signal is received, a light alarm is triggered; when a first alarm signal is received, an audible alarm is triggered; when both the first and second alarm signals are received, a third alarm signal is continuously output and an audible alarm is triggered; and the first, second, or third alarm signal is transmitted to the crane communicator.

[0012] As a further embodiment of this utility model: the power supply module includes a power interface and a first capacitor; the temperature detection module includes a first thermistor, a first resistor, a second resistor, a first potentiometer, a third resistor, and a first comparator;

[0013] Preferably, the first end of the power interface is connected to the first end of the first thermistor and the first end of the first capacitor, and is connected to the first end of the first potentiometer through the second resistor. The other end of the first potentiometer is connected to the first end of the first resistor, the other end of the first capacitor, the second end of the power port, and the ground through the third resistor. The second end of the first thermistor is connected to the non-inverting input of the first comparator and the other end of the first resistor. The slider end of the first potentiometer is connected to the inverting input of the first comparator. The output end of the first comparator is connected to the temperature difference detection module.

[0014] As a further embodiment of this utility model: the temperature difference detection module includes a first switching transistor, a first diode, a second diode, a sixth resistor, a seventh resistor, a second capacitor, an eighth resistor, a ninth resistor, and a first operational amplifier;

[0015] Preferably, the collector of the first switching transistor is connected to the first terminal of the power interface, the emitter of the first switching transistor is connected to the power supply terminal of the first operational amplifier, the inverting terminal of the first operational amplifier is connected to one end of the ninth resistor and then connected to one end of the second capacitor and the cathode of the first diode through the sixth resistor, the anode of the first diode is connected to the anode of the second diode and the second terminal of the first thermistor, the cathode of the second diode is connected to one end of the eighth resistor and the non-inverting terminal of the first operational amplifier through the seventh resistor, the other end of the eighth resistor is connected to the other end of the second capacitor and the second terminal of the power interface, and the output terminal of the first operational amplifier is connected to the other end of the ninth resistor and the abnormal judgment module.

[0016] As a further improvement of this utility model: the over-temperature detection module includes a fourth resistor, a second potentiometer, a fifth resistor, and a second comparator;

[0017] Preferably, one end of the fourth resistor is connected to the first end of the power interface, the other end of the fourth resistor is connected to one end of the second potentiometer, the other end of the second potentiometer is connected to the second end of the power interface through the fifth resistor, the output of the second comparator is connected to the alarm control module, the non-inverting input of the second comparator is connected to the second end of the first thermistor, and the inverting input of the second comparator is connected to the slider input of the second potentiometer.

[0018] As a further improvement of this utility model: the anomaly detection module includes a tenth resistor and a third diode;

[0019] Preferably, the cathode of the third diode is connected to the output terminal of the first operational amplifier through the tenth resistor, and the anode of the third diode is connected to the alarm control module.

[0020] As a further embodiment of this utility model: the alarm control module includes an eleventh resistor, a first indicator light, a second switch transistor, a first speaker, a third switch transistor, a fifth diode, a fourth diode, a first logic chip, a fourth switch transistor, a second speaker, and a crane communicator;

[0021] Preferably, the anode of the first indicator light is connected to the first terminal of the power interface, one end of the first speaker, one end of the second speaker, and the power terminal of the crane communicator via the eleventh resistor; the cathode of the first indicator light is connected to the collector of the second switching transistor; the other end of the first speaker and the other end of the second operational amplifier are respectively connected to the collectors of the third and fourth switching transistors; the base of the second switching transistor is connected to the anode of the third diode, the anode of the fifth diode, and a receiving terminal of the crane communicator; the base of the third switching transistor is connected to the output terminal of the second comparator, the second receiving terminal of the crane communicator, and the A terminal of the first logic chip; the cathode of the fifth diode is connected to the B terminal of the first logic chip and the cathode of the fourth diode; the anode of the fourth diode is connected to the Y terminal of the first logic chip, the base of the fourth switching transistor, and the third receiving terminal of the crane communicator; and the emitter of the second switching transistor is connected to the emitters of the third and fourth switching transistors, the ground terminal of the crane communicator, and the ground terminal.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows: The crane motor temperature alarm circuit of this utility model can detect the temperature of the crane motor. When the temperature reaches the set temperature, it will control the temperature difference detection module to calculate the degree of temperature change in a short time to judge the degree and rate of temperature change. When the temperature difference is greater than the set temperature difference threshold, it indicates that the temperature change is too rapid and there is a risk of overheating. At this time, the alarm control module will issue a light alarm. At the same time, the overheat detection module can detect overheating and issue an audible alarm when overheating occurs. When overheating occurs and the temperature difference is greater than the set temperature difference threshold, the alarm control module will maintain the audible alarm and wirelessly transmit the alarm status to the monitoring terminal. This allows for early overheating warnings, reducing the risk of overheating, and can issue different alarm effects according to different temperature conditions, improving the alarm effect. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic block diagram of a crane motor temperature alarm circuit provided for an example of this utility model.

[0025] Figure 2 A circuit diagram of a crane motor temperature alarm circuit provided for this utility model embodiment.

[0026] Figure 3 The connection circuit diagram of the alarm control module provided for this utility model example. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In one embodiment, see Figure 1 A crane motor temperature alarm circuit includes: a power supply module 1, a temperature detection module 2, an over-temperature detection module 3, a temperature difference detection module 4, an anomaly judgment module 5, and an alarm control module 6.

[0029] Specifically, power module 1 is used to connect to DC power;

[0030] Temperature detection module 2, connected to power module 1, is used to receive DC power and detect the temperature of the starter motor, output a temperature signal, and output a control signal when the temperature signal is greater than the set temperature threshold.

[0031] The over-temperature detection module 3 is connected to the power supply module 1 and the temperature detection module 2. It is used to receive the first electrical energy and output the first alarm signal when the temperature signal is greater than the set over-temperature threshold.

[0032] Temperature difference detection module 4 is connected to temperature detection module 2 and power module 1. It is used to store temperature signals and perform time delay and hold processing on temperature signals. When a control signal is received, it receives DC power and subtracts the real-time received temperature signal from the time delay signal to obtain the temperature difference signal.

[0033] The anomaly detection module 5 is connected to the temperature difference detection module 4 and is used to output a second alarm signal when the temperature difference signal is greater than the set temperature difference threshold.

[0034] The alarm control module 6 is connected to the over-temperature detection module 3, the anomaly judgment module 5 and the power supply module 1. It is used to receive DC power. When it receives the second alarm signal, it will activate the light alarm. When it receives the first alarm signal, it will activate the sound alarm. When it receives the first alarm signal and the second alarm signal, it will continuously output the third alarm signal and activate the sound alarm. It will transmit the first alarm signal, the second alarm signal or the third alarm signal to the crane communicator.

[0035] In a specific embodiment, the power supply module 1 can be a power circuit composed of a power interface and a capacitor, and can be connected to DC power; the temperature detection module 2 can be a temperature detection circuit composed of a thermistor, resistor, comparator, etc., which can detect the temperature of the crane motor and compare the detected temperature signal with the voltage of a set temperature threshold, which is less than an over-temperature threshold; the over-temperature detection module 3 can be an over-temperature threshold composed of a resistor, potentiometer, and comparator, which can compare the temperature signal with the voltage of a set over-temperature threshold; the temperature difference detection module 4 can be a temperature difference detection circuit composed of diodes, capacitors, operational amplifiers, etc., which can store the temperature signal and perform delay and hold processing on the temperature signal, and then calculate the real-time detection value. The voltage difference between the temperature signal and the temperature signal processed by the delay is used to calculate the rate of temperature change and the degree of temperature change over a certain period of time. The above-mentioned anomaly judgment module 5 can use an anomaly judgment circuit composed of resistors and diodes to compare the voltage difference with the voltage of the set temperature difference threshold, and then detect whether the rate of temperature change exceeds the set value. The above-mentioned alarm control module 6 can use an alarm control circuit composed of indicator lights, speakers, logic chips, crane communicators, etc. It can provide light alarm when the temperature difference is greater than the temperature difference threshold, and provide sound alarm when the temperature is too high. When the temperature is too high and the temperature difference is greater than the temperature difference threshold, it will continue to provide sound alarm, and the crane communicator will receive the alarm signal and communicate wirelessly with the wireless terminal.

[0036] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The power module 1 includes a power interface and a first capacitor C1; the temperature detection module 2 includes a first thermistor NTC, a first resistor R1, a second resistor R2, a first potentiometer RP1, a third resistor R3, and a first comparator A1.

[0037] Specifically, the first end of the power interface is connected to the first end of the first thermistor NTC and the first end of the first capacitor C1, and is connected to the first end of the first potentiometer RP1 through the second resistor R2. The other end of the first potentiometer RP1 is connected to the first end of the first resistor R1, the other end of the first capacitor C1, the second end of the power port and the ground through the third resistor R3. The second end of the first thermistor NTC is connected to the non-inverting end of the first comparator A1 and the other end of the first resistor R1. The slider end of the first potentiometer RP1 is connected to the inverting end of the first comparator A1. The output end of the first comparator A1 is connected to the temperature difference detection module 4.

[0038] In a specific embodiment, the first thermistor NTC can be a negative temperature coefficient thermistor; the second resistor R2, the first potentiometer RP1 and the third resistor R3 set the temperature threshold; the first comparator A1 can be an LM358 comparator.

[0039] Furthermore, the temperature difference detection module 4 includes a first switching transistor V1, a first diode D1, a second diode D2, a sixth resistor R6, a seventh resistor R7, a second capacitor C2, an eighth resistor R8, a ninth resistor R9, and a first operational amplifier OP1;

[0040] Specifically, the collector of the first switching transistor V1 is connected to the first terminal of the power interface, the emitter of the first switching transistor V1 is connected to the power terminal of the first operational amplifier OP1, the inverting terminal of the first operational amplifier OP1 is connected to one end of the ninth resistor R9 and, through the sixth resistor R6, to one end of the second capacitor C2 and the cathode of the first diode D1, the anode of the first diode D1 is connected to the anode of the second diode D2 and the second terminal of the first thermistor NTC, the cathode of the second diode D2 is connected to one end of the eighth resistor R8 and the non-inverting terminal of the first operational amplifier OP1 through the seventh resistor R7, the other end of the eighth resistor R8 is connected to the other end of the second capacitor C2 and the second terminal of the power interface, and the output terminal of the first operational amplifier OP1 is connected to the other end of the ninth resistor R9 and the abnormal judgment module 5.

[0041] In a specific embodiment, the first switching transistor V1 can be an NPN transistor; the first operational amplifier OP1 can be an LM158 operational amplifier, which, together with the sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9, performs subtraction processing; the first diode D1 and the second capacitor C2 perform signal delay and holding processing. Specifically, the second capacitor C2 stores electrical energy and provides a smoothly changing signal.

[0042] Furthermore, the over-temperature detection module 3 includes a fourth resistor R4, a second potentiometer RP2, a fifth resistor R5, and a second comparator A2;

[0043] Specifically, one end of the fourth resistor R4 is connected to the first end of the power interface, the other end of the fourth resistor R4 is connected to one end of the second potentiometer RP2, the other end of the second potentiometer RP2 is connected to the second end of the power interface through the fifth resistor R5, the output of the second comparator A2 is connected to the alarm control module 6, the non-inverting input of the second comparator A2 is connected to the second end of the first thermistor NTC, and the inverting input of the second comparator A2 is connected to the slider input of the second potentiometer RP2.

[0044] In a specific embodiment, the fourth resistor R4, the second potentiometer RP2, and the fifth resistor R5 are set to the over-temperature threshold; the second comparator A2 can be an LM358 comparator.

[0045] Furthermore, the anomaly detection module 5 includes a tenth resistor R10 and a third diode D3;

[0046] Specifically, the cathode of the third diode D3 is connected to the output terminal of the first operational amplifier OP1 through the tenth resistor R10, and the anode of the third diode D3 is connected to the alarm control module 6.

[0047] In a specific embodiment, the tenth resistor R10 and the third diode D3 are set to a temperature difference threshold. This temperature difference threshold is set as needed to determine the degree and rate of change of the crane motor temperature.

[0048] Furthermore, the alarm control module 6 includes an eleventh resistor R11, a first indicator LED1, a second switch V2, a first speaker BL1, a third switch V3, a fifth diode D5, a fourth diode D4, a first logic chip J1, a fourth switch V4, a second speaker BL2, and a crane communicator.

[0049] Specifically, the anode of the first indicator LED1 is connected to the first terminal of the power interface, one end of the first speaker BL1, one end of the second speaker BL2, and the power terminal of the crane communicator through the eleventh resistor R11. The cathode of the first indicator LED1 is connected to the collector of the second switching transistor V2. The other end of the first speaker BL1 and the other end of the second operational amplifier are respectively connected to the collectors of the third switching transistor V3 and the fourth switching transistor V4. The base of the second switching transistor V2 is connected to the anode of the third diode D3, the anode of the fifth diode D5, and a receiving terminal of the crane communicator. The base of the third switching transistor V3 is connected to the output terminal of the second comparator A2, the second receiving terminal of the crane communicator, and the A terminal of the first logic chip J1. The cathode of the fifth diode D5 is connected to the B terminal of the first logic chip J1 and the cathode of the fourth diode D4. The anode of the fourth diode D4 is connected to the Y terminal of the first logic chip J1, the base of the fourth switching transistor V4, and the third receiving terminal of the crane communicator. The emitter of the second switching transistor V2 is connected to the emitter of the third switching transistor V3, the emitter of the fourth switching transistor V4, the ground terminal of the crane communicator, and the ground terminal.

[0050] In a specific embodiment, the first indicator LED1 can be an LED; the second switch V2, the third switch V3 and the fourth switch V4 can all be NPN transistors; the first logic chip J1 can be an AND gate chip, which works with the fifth diode D5 and the fourth diode D4 to perform high-level self-locking; the crane communicator can be a CAN controller.

[0051] In this embodiment, a crane motor temperature alarm circuit uses a power interface to receive DC power. A first thermistor NTC and a first resistor R1 detect the temperature of the crane motor. The first thermistor NTC is located on the crane motor. When the detected temperature signal exceeds the temperature threshold set by the second resistor R2, the first potentiometer RP1, and the third resistor R3, the first comparator A1 outputs a high level, i.e., a control signal, which turns on the first switching transistor V1. The first operational amplifier OP1 then starts working. The second capacitor C2 stores the temperature signal transmitted by the first diode D1. Because the voltage of the second power source changes gradually, the first operational amplifier OP1, in conjunction with the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9, performs subtraction on the real-time detected temperature signal and the delayed temperature signal to obtain a temperature difference signal. When the temperature change accelerates and the temperature difference signal exceeds the threshold set by the tenth resistor R10 and the third diode D3... When the temperature difference threshold is reached, it indicates that the rate of temperature change exceeds the safe range, suggesting that the crane motor may be severely overloaded. The third diode D3 will break down and trigger the second switch V2 to conduct, illuminating the first indicator LED1 for a light alarm. When the temperature signal exceeds the over-temperature threshold set by the fourth resistor R4, the second potentiometer RP2, and the fifth resistor R5, the second comparator A2 outputs a first alarm signal, controlling the third switch V3 to conduct, and the first speaker BL1 to sound an alarm. If the rate of temperature change exceeds the safe range under over-temperature conditions, the first logic chip J1, the fourth diode D4, and the fifth diode D5 will self-lock, controlling the fourth switch V4 to conduct and controlling the second speaker BL2 to continuously sound an alarm. In addition, the first, second, and third receivers of the crane communicator wirelessly transmit the received signals to the monitoring terminal for wireless alarm.

[0052] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A crane motor temperature alarm circuit, characterized in that, The crane motor temperature alarm circuit comprises a power module, a temperature detection module, an over-temperature detection module, a temperature difference detection module, an abnormality judgment module and an alarm control module; The power module is used for connecting to direct current power; The temperature detection module is connected with the power module, used for receiving direct current power and detecting the temperature of the motor, and outputting a temperature signal and a control signal when the temperature signal is greater than a set temperature threshold; The over-temperature detection module is connected with the power module and the temperature detection module, used for receiving the first power and outputting a first alarm signal when the temperature signal is greater than a set over-temperature threshold; The temperature difference detection module is connected with the temperature detection module and the power module, used for storing the temperature signal and performing a delay and hold processing on the temperature signal, receiving direct current power and performing a subtraction processing on the real-time received temperature signal and the delay and hold signal to obtain a temperature difference signal when the control signal is received; The abnormality judgment module is connected with the temperature difference detection module, used for outputting a second alarm signal when the temperature difference signal is greater than a set temperature difference threshold; The alarm control module is connected with the over-temperature detection module, the abnormality judgment module and the power module, used for receiving direct current power, performing light alarm when the second alarm signal is received, performing sound alarm when the first alarm signal is received, continuously outputting a third alarm signal and performing sound alarm when the first alarm signal and the second alarm signal are received, and transmitting the first alarm signal, the second alarm signal or the third alarm signal to a crane communicator.

2. A crane motor temperature alarm circuit according to claim 1, characterised in that, The power module comprises a power interface and a first capacitor; the temperature detection module comprises a first thermistor, a first resistor, a second resistor, a first potentiometer, a third resistor and a first comparator; The first end of the power interface is connected with the first end of the first thermistor and one end of the first capacitor, and the other end of the first potentiometer is connected with the other end of the first resistor, the other end of the first capacitor, the second end of the power port and the ground end through the third resistor; the second end of the first thermistor is connected with the non-inverting terminal of the first comparator and the other end of the first resistor; the wiper terminal of the first potentiometer is connected with the inverting terminal of the first comparator; and the output terminal of the first comparator is connected with the temperature difference detection module.

3. A crane motor temperature alarm circuit according to claim 2, characterised in that, The temperature difference detection module comprises a first switch tube, a first diode, a second diode, a sixth resistor, a seventh resistor, a second capacitor, an eighth resistor, a ninth resistor and a first operational amplifier; The collector of the first switch tube is connected with the first end of the power interface; the emitter of the first switch tube is connected with the power terminal of the first operational amplifier; the inverting terminal of the first operational amplifier is connected with one end of the ninth resistor and one end of the second capacitor and the cathode of the first diode through the sixth resistor; the anode of the first diode is connected with the anode of the second diode and the second end of the first thermistor; the cathode of the second diode is connected with one end of the eighth resistor and the non-inverting terminal of the first operational amplifier through the seventh resistor; the other end of the eighth resistor is connected with the other end of the second capacitor and the second end of the power interface; and the output terminal of the first operational amplifier is connected with the other end of the ninth resistor and the abnormality judgment module.

4. A crane motor temperature alarm circuit according to claim 3, wherein The over-temperature detection module comprises a fourth resistor, a second potentiometer, a fifth resistor and a second comparator; One end of the fourth resistor is connected to a first end of a power supply interface, the other end of the fourth resistor is connected to one end of the second potentiometer, the other end of the second potentiometer is connected to a second end of the power supply interface through the fifth resistor, the output end of the second comparator is connected to the alarm control module, the non-inverting input end of the second comparator is connected to the second end of the first thermistor, and the inverting input end of the second comparator is connected to the wiper end of the second potentiometer.

5. A crane motor temperature alarm circuit according to claim 4, wherein, The abnormality judgment module comprises a tenth resistor and a third diode; The cathode of the third diode is connected to the output end of the first operational amplifier through the tenth resistor, and the anode of the third diode is connected to the alarm control module.

6. A crane motor temperature alarm circuit according to claim 5, wherein, The alarm control module comprises an eleventh resistor, a first indicator lamp, a second switch tube, a first loudspeaker, a third switch tube, a fifth diode, a fourth diode, a first logic chip, a fourth switch tube, a second loudspeaker and a crane communicator; The anode of the first indicator lamp is connected to the first end of the power supply interface, one end of the first loudspeaker, one end of the second loudspeaker and the power supply end of the crane communicator through the eleventh resistor, the cathode of the first indicator lamp is connected to the collector of the second switch tube, the other end of the first loudspeaker and the other end of the second operational amplifier are respectively connected to the collector of the third switch tube and the collector of the fourth switch tube, the base of the second switch tube is connected to the anode of the third diode, the anode of the fifth diode and one receiving end of the crane communicator, the base of the third switch tube is connected to the output end of the second comparator, the second receiving end of the crane communicator and the A end of the first logic chip, the cathode of the fifth diode is connected to the B end of the first logic chip and the cathode of the fourth diode, the anode of the fourth diode is connected to the Y end of the first logic chip, the base of the fourth switch tube and the third receiving end of the crane communicator, and the emitter of the second switch tube is connected to the emitter of the third switch tube, the emitter of the fourth switch tube, the ground end of the crane communicator and the ground end.

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