JP4325053B2 - Grain dryer burner abnormality determination device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a burner abnormality determination device for a grain dryer.
[0002]
[Prior art]
In a grain dryer equipped with a conventional storage tank, drying room, grain collection room, and elevator and drying while circulating the grains, the drying temperature is controlled by using the outside temperature detected by the outside temperature sensor as one data. In addition, a thermostat is provided in the vicinity of the burner, and for example, when the temperature of the burner section rises abnormally due to the rotation stop of the suction fan, the thermostat is activated to stop the burner.
[0003]
[Problems to be solved by the invention]
In the conventional apparatus, the outside temperature is detected by the outside temperature sensor to control the drying, and the burner is stopped by detecting the abnormal combustion of the burner by the thermostat. Therefore, a plurality of sensors are required and the structure is complicated. There was a drawback of high costs.
[0004]
Further, if the rise of a predetermined temperature (for example, 100 degrees C) is detected by utilizing the property that the detected temperature of the thermostat rises when the suction fan stops due to the fan belt driving the suction fan being cut off, combustion occurs. It was judged abnormal. However, when the outside air temperature is low, it takes time to detect an increase in the predetermined temperature, the abnormality determination is delayed, and there is a risk of misfire.
[0005]
Therefore, the present invention seeks to solve such problems by detecting the outside air temperature and detecting abnormal combustion of the burner with a single outside air temperature sensor.
[0006]
[Means for Solving the Problems]
The invention of claim 1 for solving such a problem comprises a storage tank ( 1 ) , a drying room ( 2 ) , a grain collection room ( 3 ) , and an elevator ( 4 ) while circulating the grains. in drying cereal dryer, drying chamber (2) of the hot air chamber (5) burner (15) in oppositely disposed to have the duct front (14) at one end of the place, the duct front (14) In the upper front part, various switch groups such as a drying switch (24) are provided, and an operation box (17) with a built-in controller is provided. A slit (formed in the duct front (14) behind the operation box (17) ( 19), an outside air inflow box (18) is provided above the outside air inflow box (18), and an outside air temperature sensor (16) disposed at the outside air inflow site and the outside air are slit (19, 19). , ... ) Is provided, and a harness connected to the operation box (17) is placed on the upper surface of the guide plate (20). The outside air inflow box (18) for guiding outside air and the duct front are provided. The outside air flows into the combustion part of the burner (15) through the slits (19, 19,...) Configured in (14), and the outside temperature sensor (16) detects the outside temperature every predetermined time. The combustion average value of the outside air temperature is sequentially calculated, the latest moving average value is compared with the latest outside air temperature, and the burner (15) is determined to be abnormal when it is detected that the latest outside air temperature is higher than the predetermined temperature. An abnormality determining means is provided.
[0007]
[Action and effect]
In a cereal dryer equipped with a storage tank (1), a drying chamber (2), a cereal collection chamber (3), an elevator (4) and drying while circulating the grains, a hot air chamber (5) in the drying chamber (2) ) A burner (15) is disposed in the duct front (14) opposed to one side end, and various switch groups such as a drying switch (24) are provided at the upper front of the duct front (14). An operation box (17) having a controller is provided, and an outside air inflow box (18) is provided behind the operation box (17) and above the slits (19, 19,...) Formed in the duct front (14). In the outside air inflow box (18), an outside air temperature sensor (16) disposed at the outside air inflow site and a guide plate (20) for guiding outside air to the slits (19, 19,...) Are provided. 20) Operation on the top The harness connected to the box (17) is placed, and the burner (15) passes through the outside air inflow box (18) for guiding outside air and the slit (19, 19, ...) formed in the duct front (14). ) In which the outside air flows into the combustion section, the outside air temperature sensor (16) detects the outside air temperature every predetermined time, sequentially calculates the moving average value of the outside air temperature, the latest moving average value and the latest outside air. Comparing the temperature and detecting that the latest outside air temperature is higher than the predetermined temperature by providing a combustion abnormality determining means for determining that the burner (15) is abnormal , the outside air temperature sensor 16 is used during the grain drying operation. run the drying control as one of the data detected and dried controlling the outside air temperature, sequentially while calculating a moving average of the most recent ambient temperature based on the detected outside air temperature information of a predetermined number of the outside air temperature sensor 16, the new If the detected outside air temperature is compared with the latest moving average value and the temperature rises to a predetermined temperature, it is determined that the burner 15 has a combustion abnormality. Therefore, regardless of the outside air temperature, the burner combustion abnormality is determined every predetermined time. It is possible to improve the accuracy of abnormality determination.
[0008]
Further, since the outside air temperature sensor 16 is disposed at the outside air inflow portion, when outside air is flowing normally, the influence of the combustion heat of the burner 15 on the outside air temperature sensor 16 is reduced, and the outside air temperature due to the inflowing outside air is reduced. Detection can be stabilized, and when the inflow of outside air to the burner 15 is stopped by stopping the rotation of the suction fan, the temperature around the outside air temperature sensor 16 rises rapidly, and the burner 15 is heated for a relatively short predetermined time. Can be accurately detected by the outside air temperature sensor 16.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention shown in the drawings will be described below. First, based on FIG. 1 thru | or FIG. 4, the whole structure of a grain dryer is demonstrated. 1 is an overall front view of a grain dryer, FIG. 2 is an overall side view, FIG. 3 is an overall cut front view, and FIG. 4 is an overall cut plan view.
[0010]
The cereal dryer is configured by stacking a storage tank 1, a drying chamber 2, and a cereal collection chamber 3 to form a main body, and an elevator 4 is erected on the side of the main body, and dries while circulating cereals. . In the drying chamber 2, a hot air chamber 5 composed of a mesh body having a rhombus cross section is disposed at the center, and grain flow down passages 6, 6 are provided on both the left and right sides of the hot air chamber 5. Exhaust chambers 7, 7 are arranged on both the left and right sides of the.
[0011]
The hot air chamber 5 is composed of a triangular upper hot air chamber portion 5a and an inverted triangular lower hot air chamber portion 5b, and a funnel-shaped upper grain flow passage on the left and right sides of the upper hot air chamber portion 5a. 6a, 6a are disposed, and lower grain flow passages 6b, 6b are disposed on the left and right sides of the lower hot air chamber 5b.
[0012]
The cereal collection chamber 3 is provided with a corn harvester 9 having a V-shaped cross section, and a delivery valve 10 is provided at the lower ends of the lower grain flow passages 6b, 6b. The grain fed out by the feeding valve 10 falls to the grain collecting basket 9 and is collected at the bottom, and is conveyed to one side by the lower spiral 11. The cereals conveyed to one side are supplied to the lower part of the elevator 4 standing on the side of the machine body, cerealed by the elevator 4, and further conveyed to the upper center of the storage tank 1 by the upper spiral 12. It is configured to be evenly stuck to the storage tank 1 while being diffused by the diffusion device 8. In addition, although the drawing was abbreviate | omitted for the spreading | diffusion apparatus 8, it is good also as a structure which rotates a mortar-like case and carries out the spreading | diffusion discharge | release of the grain by centrifugal force.
[0013]
A duct front 14 is disposed to face one end of the hot air chamber 5, and a burner 15 is provided in the duct front 14 so as to face the one end of the hot air chamber 5. A suction fan 13 is disposed at the other end of the hot air chamber 5 and communicates with one end of the exhaust air chamber 7.
[0014]
Thus, the outside air taken in from the front of the burner 15 by the suction force of the suction fan 13 becomes hot air due to the combustion heat of the burner 15, and the outside air is also taken in from the slits around the combustion portion of the burner 15 of the duct front 14 and mixed. And introduced into the starting end of the hot air chamber 5. Further, the hot air is guided to the grain flow down passages 6 and 6 and the exhaust air chambers 7 and 7 to dry the cereals, and is discharged from the terminal portion of the exhaust air chambers 7 and 7 to the outside through the suction fan 13. .
[0015]
A control unit (not shown) with a built-in CPU in the cereal dryer includes an extension / discharge switch 22, a drying switch 24, a stop switch 25, and a temperature setting switch 26 for adjusting the temperature of the drying air provided in the operation box 17. , Various switch groups such as a moisture setting switch 27 for adjusting the dry finish moisture of the grain, and various sensor groups such as a hot air temperature sensor, an outside air temperature sensor, an exhaust air temperature sensor, and a moisture meter are connected via an input interface. In addition, various actuators such as a suction fan motor, a burner air volume adjustment motor, a feed valve motor, and an elevator motor are connected from the control unit via an output interface and a drive circuit.
[0016]
Based on the input information of these various switch groups and sensor groups, control commands are issued to various actuator groups, such as drying temperature control, drying speed control, grain temperature control, automatic combustion amount control, automatic moisture detection stop control, etc. In addition, the safety control such as the fuel stop control at the time of power failure, the overload operation stop control, and the abnormality display is performed.
[0017]
Next, the mounting structure of the outside air temperature sensor 16 will be described with reference to FIGS. A box-shaped duct front 14 is disposed opposite to one end of the hot air chamber 5 of the drying chamber 2, and an operation box 17 having a controller (not shown) installed in the upper front portion of the duct front 14. The outside air inflow box 18 is disposed behind the operation box 17 and above the duct front 14, and the lower surface and the rear surface of the outside air inflow box 18 are opened.
[0018]
A burner 15 is disposed in the duct front 14 so as to face one end of the hot air chamber 5, and a number of slits 19, 19,... Are formed on the upper surface portion 14 a and the left and right side surfaces 14 b, 14 b of the duct front 14. And a guide plate 20 for guiding the outside air toward the slits 19, 19,... Is provided in the outside air inflow box 18 disposed above the slits 19, 19,. ing.
[0019]
Then, outside air is guided downward along the inclined surface of the guide plate 20, flows into the combustion portion of the burner 15 through the slits 19, 19,... Of the upper surface portion 14a, and the slits 19, 19, ... The outside temperature sensor 16 is arranged in the inflow portion where a lot of wind flows in the upper part.
[0020]
In this embodiment, the outside air temperature sensor 16 is arranged in the outside air inflow box 18 above the duct front 14, but it may be arranged at a portion where a large amount of combustion air flows above the duct front 14. . The outside air inflow box 18 also serves as a harness cover connected to the operation box 17, and a harness is placed on the upper surface of the guide plate 20 although the drawing is omitted.
[0021]
In the conventional apparatus, the burner 15 is disposed in the duct front 14, the protector 21 is provided in front of the combustion portion of the burner 15, and the outside air temperature sensor 16 is provided above the combustion portion of the burner 15. It was. Therefore, there is a problem that the detected temperature of the outside air temperature sensor 16 varies depending on the amount of combustion of the burner 15 and the amount of air.
[0022]
In addition, as a conventional device, there is a configuration in which an outside temperature is detected by an outside temperature sensor and drying control is performed as one piece of drying control data, and an abnormality based on the stop of the suction fan is detected by a thermostat. There are disadvantages in that a plurality of components are required, the configuration becomes complicated, and the cost increases.
[0023]
Further, in this conventional apparatus, when the suction fan 13 is stopped due to the fan belt being cut off, the temperature rises by a predetermined temperature (for example, 100 ° C.) using the property that the temperature detected by the thermostat increases. When detected, it was determined that the combustion was abnormal and the burner was stopped.
[0024]
However, when the outside air temperature is low, it takes time to detect an increase in the predetermined temperature, the abnormality determination is delayed, and there is a risk of misfire from around the burner 15. However, as described above, the outside air temperature sensor 16 is disposed at a position above the burner 15 of the duct front 14 and through the slits 19, 19,... Sometimes, the influence of the combustion heat of the burner 15 is reduced, and the detection temperature due to the inflowing outside air is made accurate. At the time of combustion abnormality in which the rotation of the suction fan 13 stops, the inflow of the outside air to the burner 15 is stopped. The temperature of the outside air temperature sensor 16 covered by the front 14 rises rapidly, and the combustion abnormality of the burner 15 can be quickly detected by the outside air temperature sensor 16.
[0025]
Next, the abnormally high temperature detection control of the burner 15 by the outside air temperature sensor 16 will be described based on the flow of FIG. When this control is started, the first average outside air temperature detection is started, ta1 is detected from the outside air temperature sensor 16 as the first detected outside air temperature (TA1), and is input to the control unit (not shown). The outside air temperature ta1 is calculated and stored as the first average value TAA = TAA1. Next, it is determined whether or not the first detected outside air temperature information TA is higher than “the average value TAA1 + 5 degrees”. If it is higher, it is determined that the outside air temperature sensor 16 has an abnormal temperature rise. For example, the burner 15 The abnormal process which stops combustion of this or notifies abnormality is executed.
[0026]
If the detection information ta1 is not high, the process proceeds to the second average outside air temperature detection to determine whether or not a predetermined time (for example, 25 Sec) has elapsed, and when the predetermined time has elapsed, the second detection is performed. Ta2 is detected as the outside air temperature (TA2), and the second average value (TAA2) is calculated and stored from the first detected outside air temperature (ta1) and the second detected outside air temperature (ta2). Next, it is determined whether or not the second detected outside air temperature (ta2) is higher than “second average value (TAA2) +5 degrees”.
[0027]
If not, the process proceeds to the third average outside air temperature detection to determine whether or not a predetermined time has elapsed. When the predetermined time has elapsed, ta3 is detected as the third detected outside air temperature (TA3). Accordingly, the first moving average value (TAA3) is calculated from the first to third detected outside air temperatures (ta1, ta2, ta3) and stored.
[0028]
Next, it is determined whether or not the first detected outside air temperature (ta1) is higher than “first moving average value (TAA3) +5 degrees”. Execute. If not, the process proceeds to the second moving average calculation process, and then it is determined whether or not a predetermined time has elapsed. When the predetermined time has elapsed, ta4 is detected as the fourth detected outside air temperature. Then, the second moving average value is calculated from the latest three detected outside air temperatures (ta2, ta3, ta4). Next, from this moving average value and the fourth detected outside air temperature ta4, it is determined whether or not there is an abnormality by the same method as described above. If there is an abnormality, the same abnormality processing is executed. Similarly, the latest moving average value is sequentially calculated, the presence / absence of abnormality is determined, and abnormality processing is executed.
[0029]
As described above, when the latest moving average value is sequentially calculated based on the predetermined number of detected outside air temperature information, the latest moving average value is compared with the latest detected outside air temperature, and the latest outside air temperature is increased by a predetermined temperature. Therefore, since it is determined that the abnormal temperature of the burner 15 is rising, it is possible to determine an abnormality every predetermined time regardless of the outside air temperature, and to improve the accuracy of the abnormality determination.
[0030]
Next, the grain insertion automatic stop control of the grain dryer will be described. A moisture meter (not shown) provided in the elevator 4 is effectively used to determine the end of the grain filling operation. The grain is supplied to the moisture meter by using the falling grain during the lifting of the elevator 4, and the moisture meter is operated during the grain tensioning operation so that the grain is collected. Falling grain is supplied to the moisture meter while it is cerealed through the chamber 3 and the elevator 4, and during moisture detection, it is determined that the grain is being laid, and the grain is no longer supplied to the moisture meter. When the detection is stopped, it is determined that the pasting work is finished. Thus, when the grain embedding operation is completed, the process proceeds to a grain drying process, and for example, ventilation drying or hot air drying is started.
[0031]
In the conventional apparatus, a dredging flow sensor is provided at the outlet of the lifted kernel above the elevator 4, and the flow of the kernel in the dryer is detected by ON / OFF of the drought flow sensor. It was the structure which detects the completion | finish of a sticking work. However, by adopting the above-described configuration, it is possible to detect the grain embedding work and the end of the embedding work using an existing moisture meter, omitting the dredging flow sensor.
[Brief description of the drawings]
[Fig. 1] Partially cut front view of cereal dryer [Fig. 2] Side view of cereal dryer [Fig. 3] Cut front view of cereal dryer [Fig. 4] Cut plan view of cereal dryer [Fig. 5] Perspective view of main part [FIG. 6] Cut side view of main part [FIG. 7] Plan view of main part [FIG. 8] Front view of main part [FIG. 9] Flowchart [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Storage tank 2 Drying room 3 Grain collection room 4 Elevator 5 Hot air room 6 Grain flow down passage 7 Ventilation room 8 Diffusion device 9 Grain collecting bowl 10 Feed valve 11 Lower spiral 12 Upper spiral 13 Suction fan 14 Duct front 15 Burner 16 Outside air Temperature sensor 17 Operation box 18 Outside air inflow box 19 Slit 20 Guide plate 21 Protector 22 Tightening / discharge switch 23 Dust remover 24 Drying switch 26 Temperature setting switch 27 Moisture setting switch

Claims (1)

A cereal dryer equipped with a storage tank ( 1 ) , a drying chamber ( 2 ) , a cereal collection chamber ( 3 ) , and an elevator ( 4 ) and drying while circulating the grains, a hot air chamber ( 5 ) of the drying chamber ( 2 ) ) Place the burner ( 15 ) in the duct front ( 14 ) that faces the one side end ,
In the upper front part of the duct front (14), various switch groups such as a drying switch (24) are provided, and an operation box (17) including a controller is provided, and the duct front (14) is provided behind the operation box (17). The outside air inflow box (18) is provided above the slits (19, 19,...) Formed in the outside air inflow box (18), and the outside air temperature sensor (16) disposed at the outside air inflow site and the outside air Is provided with a guide plate (20) for guiding the guide plate to the slit (19, 19,...), And a harness connected to the operation box (17) is placed on the upper surface of the guide plate (20).
The outside air flows into the combustion part of the burner (15) through the outside air inflow box (18) for guiding outside air and the slits (19, 19, ...) formed in the duct front (14).
The outside air temperature sensor (16) detects the outside air temperature every predetermined time, sequentially calculates the moving average value of the outside air temperature, compares the latest moving average value with the latest outside air temperature, and the latest outside air temperature is predetermined. A burner abnormality determining device for a grain dryer, comprising combustion abnormality determining means for determining that the burner (15) is abnormal when it detects that the temperature is high .

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