Grain dryness detection device for grain dryer

Abstract

The invention discloses a grain dryness detection device for a grain dryer, and relates to the technical field of humidity detection. The precision problem is solved. The detection part and the control part are arranged on the outer wall of the exhaust duct, the detection part comprises a detection shell fixed to the outer wall of the exhaust duct and a main shaft rotationally connected to the inner wall of the detection shell, and a plurality of fan plates are fixed to the outer wall of the main shaft. On the basis of arranging the plurality of hygristors, the plurality of hygristors are in contact with the fluid in sequence by utilizing the acting force of the fluid, so that the humidity can be calculated by utilizing mean value calculation, the humidity calculation error caused by the error of a single or local hygristor can be prevented, the humidity detection precision is improved, and meanwhile, in the humidity calculation logic, the humidity detection precision is improved. Whether data collected by the hygristor is abandoned or not is selected according to the error amplitude k, so that the error data collected by the hygristor in the abnormal working state can be eliminated, and the humidity detection precision is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of humidity detection, and particularly to a grain dryness detection device for a grain dryer. Background Art

[0002] In order to prevent grains from germinating, getting infested with insects, and getting moldy during storage, it is necessary to dry the grains after harvesting. When drying, it is necessary to detect the dryness of the grains to prevent energy waste caused by over-drying and insufficient drying.

[0003] After retrieval, a patent with the Chinese patent publication number CN205844310U discloses a drying detection device for a grain dryer, including a support body, a connecting member, a protection box, a first power supply, a wireless transmission module, a wireless switch module, a processor, a moisture detector, a humidity sensor, a data monitor, a display screen, a wireless receiving module, a wireless switch, and a second power supply. The support body is a right-angled U-shaped body, and a connecting member for connecting to a grain drying box is provided on the support body. A protection box is provided on the support body, and a power supply, a wireless transmission module, and a processor are provided inside the protection box. A moisture detector and a humidity sensor are provided on the support body. The wireless transmission module, the processor, the moisture detector, and the humidity sensor are respectively electrically connected to the first power supply. The wireless transmission module is electrically connected to the processor, and the moisture detector and the humidity sensor are respectively electrically connected to the processor.

[0004] The above patent has the following deficiencies: It uses a simple humidity sensor for humidity detection, but the single humidity sensor will affect the final detection accuracy due to the characteristics of the built-in humidity-sensitive resistor and the usage state during the detection process. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies existing in the prior art, and to propose a grain dryness detection device for a grain dryer.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A grain dryness detection device for a grain dryer includes a detection part and a control part arranged on the outer wall of the exhaust duct.

[0008] The detection part includes a detection housing fixed on the outer wall of the exhaust duct and a main shaft rotatably connected to the inner wall of the detection housing. A plurality of fan plates are fixed on the outer wall of the main shaft, and a humidity-sensitive resistor is fixed at the other end of the fan plate.

[0009] The control unit includes a control housing fixed to the outer wall of the exhaust duct, a processing controller and a storage battery fixed to the inner wall of the control housing. The discharge terminal of the storage battery is electrically connected to a voltage stabilizer for converting the output of different voltages of the storage battery into a fixed voltage output. The output terminal of the voltage stabilizer is electrically connected to a plurality of humidity-sensitive resistors, and the plurality of humidity-sensitive resistors are connected in parallel. Each humidity-sensitive resistor is connected in series with a galvanometer, and the galvanometer is communicatively connected to the processing controller.

[0010] Preferably, the processing controller is built-in with a humidity determination logic, which includes the following steps:

[0011] S1: Error setting, setting the accuracy error range k, where k is positively correlated with the error of the humidity-sensitive resistor; assuming that under the same humidity, the resistance value of the humidity-sensitive resistor is between R1 and R2, then the error range k of the humidity-sensitive resistor = |R1 - R2|

[0012] S2: Data acquisition, the processing controller acquires the current magnitude of the galvanometer connected in series with each humidity-sensitive resistor, and calculates the resistance value of the humidity-sensitive resistor according to the current magnitude and the output voltage U of the voltage stabilizer.

[0013] S3: Data processing, for the i-th humidity-sensitive resistor, if it means that the i-th humidity-sensitive resistor is faulty, discard the data of the i-th humidity-sensitive resistor, and then according to with the finally measured resistance value of the humidity-sensitive resistor, if then the data of the i-th humidity-sensitive resistor is correct, and then according to with the finally measured resistance value of the humidity-sensitive resistor, where R i is the calculated resistance value of the i-th humidity-sensitive resistor, is the sum of all resistance values of n humidity-sensitive resistors;

[0014] S4: Humidity calculation, calculate the humidity according to the finally measured resistance value of the humidity-sensitive resistor and the humidity value corresponding to the resistance value of the humidity-sensitive resistor.

[0015] Furthermore, the control unit further includes a control module and a display module fixed to the outer wall of the control housing, and the control module and the display module are electrically connected to the processing controller.

[0016] On the basis of the foregoing solution, the detection unit further includes a plurality of slip rings and conductive contacts. The slip rings are in contact with the conductive contacts and electrically conduct. At the same time, the humidity-sensitive resistors are connected to the output terminals of the voltage stabilizer through the slip rings and the conductive contacts. An insulating bracket is fixed to the outer wall of the main shaft. The conductive contacts are slidably connected to the side wall of the insulating bracket, and the conductive contacts are connected to the inner wall of the insulating bracket through a first spring.

[0017] In a better solution of the foregoing solution: The detection unit further includes a power generation mechanism fixed to the outer wall of the exhaust duct and a switching mechanism for controlling the power generation mechanism.

[0018] As a further solution of the present invention: The power generation mechanism includes a power generation housing fixed to the outer wall of the exhaust duct and a power generation shaft rotatably connected to the inside of the power generation housing. A stator winding is fixed to the inner wall of the power generation housing. A rotor core cooperating with the stator winding is drivingly connected to the outer wall of the power generation shaft. The output terminal of the stator winding is connected to the charging terminal of the storage battery. The power generation shaft is fixed to the end of the main shaft.

[0019] At the same time, the rotor core is rotatably connected to the outer wall of the power generation shaft, and a movable shaft is axially slidably connected to the inner wall of the power generation shaft. A plurality of pawls are radially slidably connected to the side wall of the power generation shaft. A pawl groove matching the pawls is provided on the inner wall of the rotor core. A connecting rod is rotatably connected to the inner side of the pawl, and the other end of the connecting rod is rotatably connected to the outer wall of the movable shaft.

[0020] As a preferred solution of the present invention: A second spring is buckled at the end of the movable shaft, and the other end of the second spring is buckled to the inner wall of the power generation shaft.

[0021] At the same time, the switching mechanism includes a permanent magnet, an electromagnet and an insulating plate. The insulating plate is fixed to the outer wall of the exhaust duct by bolts. The permanent magnet and the electromagnet are arranged opposite to each other, and the electromagnet is fixed to the side wall of the insulating plate. The permanent magnet is fixed to the end of the movable shaft through an end plate. The opposite sides of the permanent magnet and the electromagnet have opposite magnetic poles. The input terminal of the electromagnet is electrically connected to the output terminal of the storage battery.

[0022] As a better solution of the present invention: A sliding plate is slidably connected to the inner wall of the power generation shaft. An arc head limiting block is fixed to the outer wall of the sliding plate. The other side of the sliding plate is connected to the inner wall of the power generation shaft through a third spring. Two groups of limiting card slots cooperating with the arc head limiting block are provided on the outer wall of the movable shaft. When the arc head limiting block cooperates with one group of limiting card slots, the pawls and the pawl grooves are in a biting state. When the arc head limiting block cooperates with the other group of limiting card slots, the pawls and the pawl grooves are in a non-biting state.

[0023] The beneficial effects of the present invention are:

[0024] 1. In the present invention, on the basis of providing a plurality of humidity-sensitive resistors, the fluid acting force is used to make the plurality of humidity-sensitive resistors contact the fluid in sequence, so that the humidity can be calculated by using the mean value calculation, thereby preventing the humidity calculation error caused by the error of a single or partial humidity-sensitive resistor, increasing the humidity detection accuracy. At the same time, in the humidity calculation logic, whether to discard the data collected by the humidity-sensitive resistor is selected through the error amplitude k, so that the error data collected in the abnormal working state of the humidity-sensitive resistor can be eliminated, further increasing the humidity detection accuracy.

[0025] 2. In the present invention, by providing a slip ring and a conductive contact, and utilizing the electrical conduction and relative rotation between the slip ring and the conductive contact, the rotational movement between the humidity-sensitive resistor and the voltage regulator and the galvanometer is compensated, thus preventing wire entanglement. At the same time, by providing a first spring, on the one hand, it can ensure reliable contact between the slip ring and the conductive contact, and on the other hand, it can also perform wear compensation, increasing the reliability.

[0026] 3. In the present invention, on the basis of self-power supply by setting a storage battery, a power generation mechanism is additionally provided, so that the rotation of the rotor core can be driven by utilizing the characteristic that the main shaft needs to rotate itself during detection, and then the storage battery can be charged by the stator winding, thus realizing long-term operation of the storage battery. At the same time, its energy source is the self-rotation during detection, thus realizing a certain degree of energy recovery.

[0027] 4. In the present invention, on the basis of setting self-charging, by utilizing the change in the magnetic field strength of the electromagnet, the charging and non-charging states of the storage battery can be switched, thus preventing overcharging damage while ensuring a reliable power level in the storage battery. In addition, by utilizing the correlation between the capacity of the storage battery and the magnitude of the output voltage, and then connecting the electromagnet to the storage battery, the automatic control of self-induction and self-driving can be realized, without the intervention of manual or electronic control algorithms, increasing the convenience of use.

[0028] 5. In the present invention, by providing an arc head limit block, the movable shaft will only instantaneously move when the sum of the acting forces of the second spring, the electromagnet, and the permanent magnet on the movable shaft is greater than the limiting resistance between the arc head limit block and the limiting slot, thus reliably limiting the two positions of the movable shaft by the two limiting slots, increasing the reliability of state control and also preventing wear in the "semi-coupled" state. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of a grain moisture detection device for a grain dryer proposed by the present invention;

[0030] Figure 2 It is a schematic diagram of the internal structure of the detection housing of a grain moisture detection device for a grain dryer proposed by the present invention;

[0031] Figure 3 It is a schematic diagram of the internal structure of the control housing of a grain moisture detection device for a grain dryer proposed by the present invention;

[0032] Figure 4 It is a schematic diagram of the position structure of the slip ring and the conductive contact of a grain moisture detection device for a grain dryer proposed by the present invention;

[0033] Figure 5Schematic diagram of the position structure of the switching mechanism and the power generation mechanism of a grain dryness detection device for a grain dryer proposed by the present invention;

[0034] Figure 6 Schematic diagram of the internal structure of the power generation housing of a grain dryness detection device for a grain dryer proposed by the present invention;

[0035] Figure 7 Schematic diagram of the partial sectional structure of the power generation mechanism of a grain dryness detection device for a grain dryer proposed by the present invention;

[0036] Figure 8 Schematic diagram of the full sectional structure of the power generation mechanism of a grain dryness detection device for a grain dryer proposed by the present invention;

[0037] Figure 9 Schematic diagram of the switching mechanism of a grain dryness detection device for a grain dryer proposed by the present invention;

[0038] Figure 10 Schematic diagram of the circuit structure of a grain dryness detection device for a grain dryer proposed by the present invention;

[0039] Figure 11 Flow chart of a grain dryer of a grain dryness detection device for a grain dryer proposed by the present invention.

[0040] In the figure: 1, exhaust air duct; 2, detection part; 3, control part; 4, detection housing; 5, main shaft; 6, fan plate; 7, humidity-sensitive resistor; 8, control housing; 9, control module; 10, display module; 11, processing controller; 12, storage battery; 13, slip ring; 14, conductive contact; 15, spring one; 16, switching mechanism; 17, power generation mechanism; 18, stator winding; 19, power generation housing; 20, rotor core; 21, power generation shaft; 22, pawl; 23, connecting rod; 24, movable shaft; 25, spring two; 26, ratchet groove; 27, spring three; 28, slide plate; 29, arc head limit block; 30, limit card slot; 31, end plate; 32, permanent magnet; 33, electromagnet; 34, insulating plate; 35, insulating frame. Detailed implementation manners

[0041] The technical solutions of the present invention will be further described in detail below in conjunction with the specific implementation manners.

[0042] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0043] Figure 11 For the type of grain drying tower applied in this embodiment, since the drying degree of the grain is related to the outlet air humidity of the drying section, specifically, the greater the outlet air humidity, the lower the drying degree of the grain. Therefore, specifically, this device is arranged at the exhaust air duct (1) of the grain drying tower.

[0044] Embodiment 1:

[0045] A grain dryness detection device for a grain dryer, as Figure 1 - Figure 10 shown, including a detection part 2 and a control part 3 arranged on the outer wall of the exhaust air duct 1. The detection part 2 includes a detection housing 4 fixed on the outer wall of the exhaust air duct 1 and a main shaft 5 rotatably connected to the inner wall of the detection housing 4. A plurality of fan plates 6 are fixed on the outer wall of the main shaft 5, and a humidity-sensitive resistor 7 is fixed at the other end of the fan plate 6.

[0046] The control part 3 includes a control housing 8 fixed on the outer wall of the exhaust air duct 1, a processing controller 11 and a storage battery 12 fixed on the inner wall of the control housing 8. The discharge terminal of the storage battery 12 is electrically connected to a voltage stabilizer for converting the different voltage outputs of the storage battery 12 into a fixed voltage output. The output terminal of the voltage stabilizer is electrically connected to a plurality of humidity-sensitive resistors 7, and the plurality of humidity-sensitive resistors 7 are connected in parallel. Each humidity-sensitive resistor 7 is connected in series with a galvanometer, and the galvanometer is communicatively connected to the processing controller 11.

[0047] The processing controller 11 is built-in with a humidity determination logic, which includes the following steps:

[0048] S1: Error setting, setting the precision error range k, where k is positively correlated with the error of the humidity-sensitive resistor 7; assuming that under the same humidity, the resistance value of the humidity-sensitive resistor 7 is between R1 and R2, then the error range k of the humidity-sensitive resistor 7 = |R1 - R2|

[0049] S2: Data acquisition, the processing controller 11 acquires the current magnitude of the galvanometer connected in series with each humidity-sensitive resistor 7, and calculates the resistance value of the humidity-sensitive resistor 7 according to the current magnitude and the output voltage U of the voltage stabilizer.

[0050] S3: Data processing, for the i-th humidity-sensitive resistor 7, if it means that the i-th humidity-sensitive resistor 7 is faulty, discard the data of the i-th humidity-sensitive resistor 7, and then according to with the finally measured resistance value of the humidity-sensitive resistor 7, if then the data of the i-th humidity-sensitive resistor 7 is correct, and then according to with the finally measured resistance value of the humidity-sensitive resistor 7, where R i is the calculated resistance value of the i-th humidity-sensitive resistor 7, is the sum of all the resistance values of the n humidity-sensitive resistors 7;

[0051] S4: Humidity calculation. Based on the finally measured resistance value of the humidity-sensitive resistor 7 and in combination with the humidity value corresponding to the resistance value of the humidity-sensitive resistor 7, calculate the humidity.

[0052] When this device is in use, as the exhaust duct 1 exhausts air, the fan plate 6 and the humidity-sensitive resistor 7 will be moved and rotated by the fluid force, so that multiple humidity-sensitive resistors 7 continuously come into contact with the air in the exhaust duct 1, causing the humidity-sensitive resistor 7 to generate a resistance value corresponding to the humidity, causing the galvanometer to generate a corresponding current value, and then calculating the fluid humidity in the exhaust duct 1 according to the magnitude of the current value, so as to judge the grain dryness.

[0053] Based on the setting of multiple humidity-sensitive resistors 7, this device uses the fluid force to make multiple humidity-sensitive resistors 7 come into contact with the fluid in turn, so that the humidity can be calculated by using the average value calculation, thus preventing the humidity calculation error caused by the error of a single or local humidity-sensitive resistor 7 and increasing the humidity detection accuracy. At the same time, in the humidity calculation logic, the data collected by the humidity-sensitive resistor 7 is selected whether to be discarded through the error range k, so as to eliminate the error data collected in the abnormal working state of the humidity-sensitive resistor 7, further increasing the humidity detection accuracy.

[0054] To solve the display and control problems; as Figure 3 shown, the control unit 3 further includes a control module 9 and a display module 10 fixed to the outer wall of the control housing 8, and the control module 9 and the display module 10 are electrically connected to the processing controller 11.

[0055] It can be displayed through the display module 10 and operated through the control module 9.

[0056] To solve the connection problems; as Figure 4 shown, the detection unit 2 further includes a plurality of slip rings 13 and conductive contacts 14. The slip rings 13 are in contact with the conductive contacts 14 and electrically conduct. At the same time, the humidity-sensitive resistor 7 is connected to the output terminal of the voltage regulator through the slip rings 13 and the conductive contacts 14. Specifically, the number of groups of the slip rings 13 and the conductive contacts 14 is twice the number of groups of the humidity-sensitive resistors 7. For one humidity-sensitive resistor 7, one end is connected to the conductive contact 14, the slip ring 13 cooperating with the conductive contact 14 is connected to the voltage regulator, the other end of the humidity-sensitive resistor 7 is connected to another conductive contact 14, and the slip ring 13 cooperating with this conductive contact 14 is connected to the galvanometer, and the galvanometer is then connected to the output terminal of the voltage regulator. Since the connection of parallel and series circuits is common knowledge for those skilled in the art, this embodiment will not elaborate on it too much.

[0057] An insulating bracket 35 is fixed to the outer wall of the main shaft 5. The conductive contact 14 is slidably connected to the side wall of the insulating bracket 35, and the conductive contact 14 is connected to the inner wall of the insulating bracket 35 through a first spring 15.

[0058] Since the humidity-sensitive resistor 7 is a rotating part, while the voltage stabilizer and the storage battery 12 are fixed parts, wire entanglement will occur if wires are directly used for the conductive connection between them. In this device, by providing a slip ring 13 and a conductive contact 14, and utilizing the electrical conduction and relative rotation between the slip ring 13 and the conductive contact 14, the rotational movement between the humidity-sensitive resistor 7 and the voltage stabilizer and the galvanometer is compensated, thereby preventing wire entanglement. At the same time, by providing a first spring 15, on the one hand, it can ensure reliable contact between the slip ring 13 and the conductive contact 14, and on the other hand, it can also perform wear compensation, increasing the reliability.

[0059] When this embodiment is in use, as the exhaust duct 1 exhausts air, the fan plate 6 and the humidity-sensitive resistor 7 will be moved and rotated by the fluid force, so that the plurality of humidity-sensitive resistors 7 continuously contact the air in the exhaust duct 1, causing the humidity-sensitive resistor 7 to generate a resistance value corresponding to the humidity, causing the galvanometer to generate a corresponding current value, and then calculating the fluid humidity in the exhaust duct 1 based on the magnitude of the current value to determine the grain dryness. Since the humidity-sensitive resistor 7 is a rotating part, while the voltage stabilizer and the storage battery 12 are fixed parts, wire entanglement will occur if wires are directly used for the conductive connection between them. In this device, by providing a slip ring 13 and a conductive contact 14, and utilizing the electrical conduction and relative rotation between the slip ring 13 and the conductive contact 14, the rotational movement between the humidity-sensitive resistor 7 and the voltage stabilizer and the galvanometer is compensated, thereby preventing wire entanglement. At the same time, by providing a first spring 15, on the one hand, it can ensure reliable contact between the slip ring 13 and the conductive contact 14, and on the other hand, it can also perform wear compensation, increasing the reliability.

[0060] Embodiment 2:

[0061] A grain dryness detection device for a grain dryer, as Figure 1 - Figure 10 shown. Since the entire device is arranged outside the exhaust duct 1 and the exhaust duct 1 itself has no electrical components and there is no circuit, but the device needs electricity, so to solve the self-power supply problem; the following improvements are made in this embodiment based on Embodiment 1: The detection unit 2 further includes a power generation mechanism 17 fixed to the outer wall of the exhaust duct 1 and a switching mechanism 16 for controlling the power generation mechanism 17.

[0062] The power generation mechanism 17 includes a power generation housing 19 fixed to the outer wall of the exhaust duct 1 and a power generation shaft 21 rotatably connected inside the power generation housing 19. A stator winding 18 is fixed to the inner wall of the power generation housing 19. A rotor core 20 cooperating with the stator winding 18 is drivingly connected to the outer wall of the power generation shaft 21. The output terminals of the stator winding 18 are connected to the charging terminals of the storage battery 12. The power generation shaft 21 is fixed to the end of the main shaft 5.

[0063] During the humidity detection process, the main shaft 5 rotates synchronously with the fan plate 6 and the humidity-sensitive resistor 7, thereby driving the rotation of the power generation shaft 21. The power generation shaft 21 drives the rotation of the rotor core 20, so that an induced electromotive force is generated in the stator winding 18, and then the induced electromotive force is applied to the charging terminals of the storage battery 12 to charge the storage battery 12.

[0064] In this device, on the basis of setting the storage battery 12 for self-power supply, a power generation mechanism 17 is additionally provided, so that the rotation characteristic of the main shaft 5 itself during detection can be used to drive the rotation of the rotor core 20, and then the stator winding 18 is used to charge the storage battery 12, thereby realizing the long-term operation of the storage battery 12. At the same time, its energy comes from its own rotation during detection, thus realizing a certain degree of energy recovery.

[0065] To solve the problems in the automatic control of the charging process such as Figures 5 - 9 As shown, the rotor core 20 is rotatably connected to the outer wall of the power generation shaft 21, and a movable shaft 24 is axially slidably connected to the inner wall of the power generation shaft 21. A plurality of pawls 22 are radially slidably connected to the side wall of the power generation shaft 21. Pawl grooves 26 matching the pawls 22 are formed in the inner wall of the rotor core 20. A connecting rod 23 is rotatably connected to the inner side of the pawl 22, and the other end of the connecting rod 23 is rotatably connected to the outer wall of the movable shaft 24.

[0066] A second spring 25 is buckled at the end of the movable shaft 24, and the other end of the second spring 25 is buckled to the inner wall of the power generation shaft 21.

[0067] The switching mechanism 16 includes a permanent magnet 32, an electromagnet 33 and an insulating plate 34. The insulating plate 34 is fixed to the outer wall of the exhaust duct 1 by bolts. The permanent magnet 32 and the electromagnet 33 are arranged opposite to each other, and the electromagnet 33 is fixed to the side wall of the insulating plate 34. The permanent magnet 32 is fixed to the end of the movable shaft 24 through an end plate 31. The opposite sides of the permanent magnet 32 and the electromagnet 33 have opposite magnetic poles.

[0068] The input terminals of the electromagnet 33 are electrically connected to the output terminals of the storage battery 12.

[0069] As the current stored power of the storage battery 12 decreases, the output voltage of the storage battery 12 also decreases, thereby reducing the field strength of the electromagnet 33, and thus reducing the magnetic suction force between the electromagnet 33 and the permanent magnet 32. Until it drops to the threshold value, the movable shaft 24 will be pulled inward by the second spring 25, and thus the pawl 22 will be pushed outward through the connecting rod 23, so that the pawl 22 engages with the ratchet groove 26, and the rotor core 20 is driven by the power generation shaft 21, and the storage battery 12 is in a charging state. As the storage battery 12 is gradually charged, its output voltage gradually increases, thereby increasing the field strength of the electromagnet 33. Until the rated capacity of the storage battery 12 is reached, the magnetic suction force between the electromagnet 33 and the permanent magnet 32 overcomes the pulling force of the second spring 25, causing the movable shaft 24 to move in the reverse direction, and thus using the connecting rod 23 to pull the pawl 22 inward, so that the rotor core 20 is not driven by the power generation shaft 21, and the storage battery 12 disconnects the charging state.

[0070] In this device, on the basis of setting self-charging, by utilizing the change in the field strength of the electromagnet 33, the charging and non-charging states of the storage battery 12 can be switched, so as to prevent overcharging damage while ensuring a reliable power supply in the storage battery 12. In addition, by utilizing the correlation between the capacity of the storage battery 12 and the magnitude of the output voltage, and then connecting the electromagnet 33 to the storage battery 12, the automatic control of self-induction and self-driving can be realized without the intervention of manual or electronic control algorithms, increasing the convenience of use.

[0071] To solve the reliability of state switching, as Figure 8 shown, a sliding plate 28 is slidably connected to the inner wall of the power generation shaft 21. An arc head limit block 29 is fixed to the outer wall of the sliding plate 28. The other side of the sliding plate 28 is connected to the inner wall of the power generation shaft 21 through a third spring 27. And two groups of limit card slots 30 that cooperate with the arc head limit block 29 are arranged on the outer wall of the movable shaft 24. When the arc head limit block 29 cooperates with one group of limit card slots 30, the pawl 22 and the ratchet groove 26 are in an engaged state. When the arc head limit block 29 cooperates with the other group of limit card slots 30, the pawl 22 and the ratchet groove 26 are in a non-engaged state.

[0072] Since the position of the movable shaft 24 is controlled by the spring two 25 in combination with the magnetic force, the position of the movable shaft 24 belongs to a continuous change process, which may cause a critical contact state between the pawl 22 and the ratchet groove 26. This "semi-engagement" state of critical contact will cause wear and also make the state control of whether the storage battery 12 is charged or not inaccurate. In this device, by setting the arc head limit block 29, only when the sum of the acting forces of the spring two 25, the electromagnet 33, and the permanent magnet 32 on the movable shaft 24 is greater than the limit resistance of the arc head limit block 29 and the limit card slot 30, the movable shaft 24 will instantaneously move, so as to reliably limit the two positions of the movable shaft 24 by using the two limit card slots 30, increase the reliability of state control and also prevent wear in the "semi-engagement" state.

[0073] When this embodiment is in use, during the humidity detection process, the main shaft 5 will rotate synchronously with the fan plate 6 and the humidity-sensitive resistor 7, thereby driving the power generation shaft 21 to rotate. The power generation shaft 21 drives the rotor core 20 to rotate, so that an induced electromotive force is generated in the stator winding 18, and then the induced electromotive force is applied to the charging terminal of the storage battery 12 to charge the storage battery 12. And because when the current stored power of the storage battery 12 decreases, the output voltage of the storage battery 12 will also decrease, thereby reducing the field strength of the electromagnet 33, and thus reducing the magnetic attraction between the electromagnet 33 and the permanent magnet 32. Until it drops to the threshold value, the movable shaft 24 will be pulled inward by the spring two 25, thereby pushing the pawl 22 outward through the connecting rod 23, so that the pawl 22 engages with the ratchet groove 26, the rotor core 20 and the power generation shaft 21 are in transmission, and the storage battery 12 is in the charging state. As the storage battery 12 is gradually charged, its output voltage gradually increases, thereby increasing the field strength of the electromagnet 33. Until it reaches the rated capacity of the storage battery 12, the magnetic attraction of the electromagnet 33 and the permanent magnet 32 overcomes the pulling force of the spring two 25, causing the movable shaft 24 to move in the reverse direction, thereby pulling the pawl 22 inward by using the connecting rod 23, so that the rotor core 20 and the power generation shaft 21 are not in transmission, and the storage battery 12 is disconnected from the charging state. At the same time, since the position of the movable shaft 24 is controlled by the spring two 25 in combination with the magnetic force, the position of the movable shaft 24 belongs to a continuous change process, which may cause a critical contact state between the pawl 22 and the ratchet groove 26. This "semi-engagement" state of critical contact will cause wear and also make the state control of whether the storage battery 12 is charged or not inaccurate. In this device, by setting the arc head limit block 29, only when the sum of the acting forces of the spring two 25, the electromagnet 33, and the permanent magnet 32 on the movable shaft 24 is greater than the limit resistance of the arc head limit block 29 and the limit card slot 30, the movable shaft 24 will instantaneously move, so as to reliably limit the two positions of the movable shaft 24 by using the two limit card slots 30, increase the reliability of state control and also prevent wear in the "semi-engagement" state.

[0074] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A grain dryness detection device for a grain dryer, comprising a detection part (2) and a control part (3) arranged on the outer wall of an exhaust air duct (1), characterized in that the detection part (2) includes a detection housing (4) fixed to the outer wall of the exhaust air duct (1) and a main shaft (5) rotatably connected to the inner wall of the detection housing (4). A plurality of fan plates (6) are fixed to the outer wall of the main shaft (5), and a humidity-sensitive resistor (7) is fixed to the other end of the fan plate (6); the control part (3) includes a control housing (8) fixed to the outer wall of the exhaust air duct (1), a processing controller (11) and a storage battery (12) fixed to the inner wall of the control housing (8). A discharge terminal of the storage battery (12) is electrically connected to a voltage stabilizer for converting different voltage outputs of the storage battery (12) into a fixed voltage output. An output terminal of the voltage stabilizer is electrically connected to a plurality of humidity-sensitive resistors (7), and the plurality of humidity-sensitive resistors (7) are connected in parallel. Each humidity-sensitive resistor (7) is connected in series with a galvanometer, and the galvanometer is communicatively connected to the processing controller (11).

2. The grain dryness detection device for a grain dryer according to claim 1, characterized in that, The processing controller (11) has a built-in humidity determination logic, which includes the following steps: S1: Error setting, setting the accuracy error range k, and k is positively correlated with the error of the humidity-sensitive resistor (7); S2: Data acquisition, the processing controller (11) acquires the current magnitude of the galvanometer connected in series with each humidity-sensitive resistor (7), and calculates the resistance value of the humidity-sensitive resistor (7) according to the current magnitude and the output voltage U of the voltage stabilizer; S3: Data processing. For the i-th humidity sensor resistor (7), if it represents that the i-th humidity sensor resistor (7) is faulty, discard the data of the i-th humidity sensor resistor (7), and then according to using the finally measured resistance value of the humidity sensor resistor (7), if then the data of the i-th humidity sensor resistor (7) is correct, and then according to using the finally measured resistance value of the humidity sensor resistor (7), where R i is the calculated resistance value of the i-th humidity sensor resistor (7), is the sum of all resistance values of the n humidity sensor resistors (7); S4: Humidity calculation, according to the finally measured resistance value of the humidity-sensitive resistor (7), combined with the humidity value corresponding to the resistance value of the humidity-sensitive resistor (7), calculate the humidity.

3. A grain dryness detection device for a grain dryer according to claim 1, characterized in that, The control part (3) further includes a control module (9) and a display module (10) fixed to the outer wall of the control housing (8), and the control module (9) and the display module (10) are electrically connected to the processing controller (11).

4. A grain dryness detection device for a grain dryer according to claim 1, characterized in that, The detection part (2) further includes a plurality of slip rings (13) and conductive contacts (14). The slip rings (13) are in contact with and electrically conduct with the conductive contacts (14). At the same time, the humidity-sensitive resistor (7) is connected to the output terminal of the voltage stabilizer through the slip rings (13) and the conductive contacts (14). An insulating frame (35) is fixed to the outer wall of the main shaft (5), and the conductive contact (14) is slidably connected to the side wall of the insulating frame (35), and the conductive contact (14) is connected to the inner wall of the insulating frame (35) through a first spring (15).

5. The grain dryness detection device for a grain dryer according to claim 1, characterized in that, The detection part (2) further includes a power generation mechanism (17) fixed to the outer wall of the exhaust air duct (1) and a switching mechanism (16) for controlling the power generation mechanism (17).

6. The grain dryness detection device for a grain dryer according to claim 5, characterized in that, The power generation mechanism (17) includes a power generation housing (19) fixed to the outer wall of the exhaust air duct (1) and a power generation shaft (21) rotatably connected to the inside of the power generation housing (19). A stator winding (18) is fixed to the inner wall of the power generation housing (19). A rotor core (20) cooperating with the stator winding (18) is drivingly connected to the outer wall of the power generation shaft (21). An output terminal of the stator winding (18) is connected to a charging terminal of the storage battery (12), and the power generation shaft (21) is fixed to the end of the main shaft (5).

7. The grain dryness detection device for a grain dryer according to claim 6, characterized in that, The rotor core (20) is rotatably connected to the outer wall of the power generation shaft (21), and a movable shaft (24) is axially slidably connected to the inner wall of the power generation shaft (21). A plurality of pawls (22) are radially slidably connected to the side wall of the power generation shaft (21). A pawl groove (26) matching the pawl (22) is formed in the inner wall of the rotor core (20). A connecting rod (23) is rotatably connected to the inner side of the pawl (22), and the other end of the connecting rod (23) is rotatably connected to the outer wall of the movable shaft (24).

8. A grain dryness detection device for a grain dryer according to claim 7, characterized in that, A second spring (25) is buckled at the end of the movable shaft (24), and the other end of the second spring (25) is buckled to the inner wall of the power generation shaft (21).

9. The grain dryness detection device for a grain dryer according to claim 7, characterized in that, The switching mechanism (16) includes a permanent magnet (32), an electromagnet (33) and an insulating plate (34). The insulating plate (34) is fixed to the outer wall of the exhaust duct (1) by bolts. The permanent magnet (32) and the electromagnet (33) are arranged opposite to each other, and the electromagnet (33) is fixed to the side wall of the insulating plate (34). The permanent magnet (32) is fixed to the end of the movable shaft (24) by an end plate (31). The opposite sides of the permanent magnet (32) and the electromagnet (33) have opposite magnetic poles. The input terminal of the electromagnet (33) is electrically connected to the output terminal of the storage battery (12).

10. A grain dryness detection device for a grain dryer according to claim 9, characterized in that, A sliding plate (28) is slidably connected to the inner wall of the power generation shaft (21). An arc head limiting block (29) is fixed to the outer wall of the sliding plate (28). The other side of the sliding plate (28) is connected to the inner wall of the power generation shaft (21) by a third spring (27). Two groups of limiting card slots (30) cooperating with the arc head limiting block (29) are arranged on the outer wall of the movable shaft (24). When the arc head limiting block (29) cooperates with one group of limiting card slots (30), the pawl (22) and the pawl groove (26) are in a biting state. When the arc head limiting block (29) cooperates with the other group of limiting card slots (30), the pawl (22) and the pawl groove (26) are in a non-biting state.

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