JP3610652B2 - Rotation control method of burner moda in grain dryer. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotation control method for a burner motor used as a heat source for a grain dryer .
[0002]
[ Prior art ]
For example, in a grain dryer, a vaporizer burner that uses kerosene as fuel is used, and the fuel is supplied by adding an electromagnetic pump or an electromagnetic valve to the fuel, and the amount of fuel supplied is controlled for drying speed control, constant temperature control, etc. In the case of change control, the electromagnetic pump or the electromagnetic valve is configured to change the on-time. At the same time, the supply amount of air necessary for combustion is controlled with this on-time output. That is, the rotational speed of the burner motor that rotates the fan that introduces the combustion air is controlled to a predetermined value. By the way, since the control is executed by relating the on-time output to both the fuel supply amount and the introduced air amount in this way, the necessary air amount can be obtained in proportion to the required fuel amount, which is convenient. However, it is necessary to correct the rotational speed of the burner motor due to variations in equipment.
[0003]
[Problems to be solved by the invention]
For this reason, conventionally, the “slope” and “level” of the relationship line with the burner motor rotation speed which changes substantially proportionally to the on-time output are changed by two dedicated adjustment dials. During the drying, the output of the on-time change is frequently given and the adjustment is not easy, but it is desirable that the adjustment can be performed during the drying in which the combustion state can be directly confirmed.
[0004]
[Means for Solving the Problems]
In view of this, the present invention provides a grain dryer for drying by acting hot air heated by the burner 6 while circulating and transferring the stretched grain. The burner 6 changes the on-time output Ton of the electromagnetic valve or electromagnetic pump 17. The number of revolutions N of the burner motor 20 that is configured to change the fuel supply amount and that drives the fan 21 that introduces combustion air,
N = K × Ton + B
Is a method of controlling the rotational speed of the burner motor 20 to be calculated by the above-described method, wherein the characteristic values K and B of the equation can be changed and set in advance according to the combustion state and the like. The characteristic value is set by the timer increase / decrease switches 38 and 39 which are set in the change setting mode in accordance with the combined operation of the existing switches 31 , 32 and 33 for starting and stopping the mounted device and changing the operation time of the device. K and B are arbitrarily corrected, and the characteristic value K or B is returned to the initial value by the combined operation of the timer increase / decrease switches 38 and 39 during the correction process , and further , the combined operation of the existing switches 31 and 34 is performed. A rotation control method for a burner motor configured to cancel the change setting mode.
[0005]
[Effects of the invention]
The characteristic values K and B of the equation for calculating the rotational speed of the fan for introducing the combustion air of the burner are set in advance according to the combustion state and the like, and the combined operation of the existing switches 31 , 32 and 33 during the burner 6 operation Accordingly, these change setting modes are set, the characteristic values K and B are arbitrarily corrected by the operation of other existing timer increase / decrease switches , and the change setting mode is further performed by the combined operation of the other existing switches 31 and 34. Therefore, there is no need to provide a dedicated switch.
Further, the characteristic value K or B can be returned to the initial value by operating both the timer increase / decrease switches 38 and 39, and the adjustment can be easily performed from the initial value when the burner is readjusted.
[0006]
In particular, in the grain dryer, when the burner motor output correction is executed with the existing switches such as the drying / discharging switches 32 and 33 or the timer increase / decrease switches 38 and 39 in addition to the operation of the tension switch 31, Since switches that are normally used frequently are also used, it is difficult to cause erroneous operations.
[0007]
【Example】
An embodiment of the present invention will be described with reference to the drawings. 1 is a machine frame of a grain drying device, which is stacked in the order of a storage chamber 2, a drying chamber 3, and a grain collection chamber 4, and burners in the drying chamber 3 while circulating grains by driving an elevator 5 provided outside. 6 is a publicly known form in which hot air generated by the combustion and the suction fan 7 is bathed and dried.
[0008]
8 is a feeding valve, 9 is a lower transfer device that communicates with the elevator 5, and 10 is an upper transfer device that is connected to the upper side of the elevator 5, and can supply grains to the diffusion plate 11 at the upper part of the storage chamber 2. The burner 6 is a vaporization-type burner, and on the front side, a vaporizing cylinder 13 that is rotated by a motor 12 is arranged in the center, and a combustion disc 14 is provided. 15 is a blower cylinder, and 16 is a fuel nozzle connected to the electromagnetic pump 17. In addition to the motor 12, the burner case 19 having an opening 18 at the rear has a burner motor 20, a fan 21 rotated by the burner motor 20, and the like. Reference numeral 22 denotes a substrate of the burner 6, and the burner 6 main body is fixedly supported on the upper surface side. A detachable filter case 23 is provided below the substrate 22, and the filter 24 is accommodated therein. When the fan 21 rotates, the air introduced from the inlets 25, 25 provided in the substrate 22 enters the burner case 19 through the filter 24 and the connection duct 26 and passes through the blower cylinder 15.
[0009]
A hot air duct 27 having a rectangular cross section is connected to the front side of the burner 6 main body fixed to the substrate 22, and the duct 27 is fixed in a state of being inserted into the hot air chamber entrance. The burner 6, the grain circulation mechanism, and the like are performed by a computer having a memory that stores a control program and various data necessary for drying control. That is, the operation panel 30 is provided with switches 31, 32, 33, and 34 for selecting each operation mode of grain embedding, drying, discharging, and stopping, and drying that determines whether the drying speed is slow or fast. A setting switch 35, a setting moisture switch 36, an extension amount setting switch 37, and timer time increase / decrease switches 38 and 39 are provided. Reference numeral 40 denotes an emergency stop switch for stopping all of the emergency. Each time the switches 35 to 37 are pressed, they move in the order of display positions according to a predetermined numerical value or mode (for example, on the right side). The position of the setting state is indicated by LEDs arranged in a horizontal row. Lights up and displays.
[0010]
Reference numeral 41 denotes an abnormality monitor that displays an LED when an abnormality is detected in each part, and has a configuration in which an abnormal part can be easily confirmed from the figure. The built-in calculation control unit 42 receives the above switch information of the operation panel 30 and detection information from sensors provided in each part of the dryer, and controls the burner combustion amount and starts the grain circulation system based on necessary comparison calculations.・ Perform stop control. Reference numeral 43 denotes a storage unit.
[0011]
FIG. 4 shows a control block diagram. In addition to the setting information from the above switches, the arithmetic control unit 42 includes moisture meter 44 detection information, grain detection information of the grain flow detector 45 provided in the throwing unit of the elevator 5, and hot air temperature. Temperature information of the detector 46 and the exhaust air temperature detector 47, detection information of the wind pressure detector 48, and the like are input. On the other hand, as output information, a combustion system signal of the burner 6, specifically, an on-time of the electromagnetic pump 17 is input. Signal Ton, rotation speed N signal of burner motor 20, up-and-down transfer devices 8, 9, elevator 5 and feed valve 8, etc., grain circulation system motor control signal, suction fan 7 motor control signal, moisture on display 49, residual There are time, hot air temperature display signals, etc.
[0012]
The relationship between the on-time signal Ton of the electromagnetic pump 17 and the rotational speed N of the burner motor 20 is as shown in the following equation, and this content is stored in the storage unit 43. That is,
N = K x Ton + B ......
It is. Here, B and K are characteristic values indicating “level” and “slope”, and B = 10 × VR1−300.
K = VR2 + 70 …… C)
It is determined by arbitrarily setting VR1 and VR2, and these VR1 and VR2 are red fire, lift combustion (flame burns away from the combustion plate surface more than appropriate), etc. The size is changed depending on the combustion state. The relational expression of B and K is also stored in the storage unit 43.
[0013]
Incorporated into one of the functions of the arithmetic control unit 42 to change and control the on-time width by comparing the set hot air temperature Tc set by the on-time signal Ton, the drying control mode and the like with the hot air temperature Tb during the actual drying operation. It is. In addition, upon receiving the on-time width change control signal, the N is calculated, and the rotation of the burner motor 20 is controlled.
[0014]
Next, the adjustment of “level” and “slope” of the above N calculation formula during the drying operation, specifically, the setting change of VR1 and VR2 will be described. As shown in the flowchart of FIG. 6, the output correction process of the burner motor rotation number can be performed after changing to the processing mode by the combined operation of the existing switches. That is, after the tension switch 31 is “ON”, when the drying switch 32 is “ON”, the “level” correction processing mode can be set, and when the discharge switch 33 is “ON”, the “tilt” correction processing mode can be set. When the timer increase / decrease switch 38 or 39 is turned “ON” after setting to the “level” correction processing mode , the value of VR1 is changed to large or small, and as a result, the characteristic value B can be changed and corrected. Similarly, when the timer increase / decrease switch 38 or 39 is set to “ON” after setting to the “tilt” correction processing mode , the value of VR2 is changed to large or small, so that the characteristic value K can be changed and corrected.
[0015]
The “level” correction value or the “tilt” correction value is rewritten and stored in the storage unit 43 when the extension switch 31 or the stop switch 34 is “ON”, as shown in FIGS. In the flowcharts of FIGS. 7 and 8, the correction value is set to change by ± 1 every ± 30 steps by the “ON” operation of the timer increase / decrease switch. During the burner motor rotation speed correction processing operation during the drying operation described above, the display unit 49 outputs the normal moisture value / remaining time / hot air temperature repeated display output, on-time output value, burner motor rotation speed, “level” or The output is switched to repeatedly display the “tilt” correction value.
[0016]
In the correction processing mode , the level setting and the inclination setting are returned to the initial values by a combined operation of pressing the timer decrease switch 39 while pressing the timer increase switch 38. For this reason, it is desirable to perform readjustment of the burner from the initial value, and adjustment is easy. The burner motor 20 may not be able to obtain the set value Nc even by correcting the rotation speed of the burner motor 20 due to variations in power supply voltage, power IC, and the like. In order to solve this problem, a rotation speed detection sensor (not shown) of the burner motor 20 may be provided, and the current (m-th) rotation speed Nm may be corrected by comparison with the set value Nc. Since the rotation speed Nm is converted to the burner motor speed command voltage Vm, if the converted voltage Vm is corrected, for example,
Vm = (Nc-Nm-1) / C + Vm-1 (d)
Is calculated by C is a value predicted from the burner motor speed command voltage Vm obtained by variously changing the power supply voltage and power IC and the actual rotational speed Nm. It is not always necessary to use the converted voltage.
[0017]
Also, the initial set rotational speed Nc0 calculated from the initial burner motor speed command voltage V0 is compared with the actual rotational speed N0, and an ignition command signal is output when the speed falls within the range of Nc0 ± α. Thus, initial combustion is stabilized. The operation of the above example will be described. When the tension switch 31 is turned on, the grain to be dried put into the hopper is stretched into the storage section 2 through the elevator 5.
[0018]
When the insertion is completed, the stop switch 34 is turned on to temporarily stop each part. Next, the drying switch 32 is turned on in order to shift to the drying operation. The drying speed is set in advance using the switch 35 with the grain type as a guide, and the drying finish moisture is determined in advance using the setting switch 36. The elevator 5, the vertical transfer devices 7, 10, the feeding valve 8, etc. are started to operate, and the burner is also activated to start hot air drying. While flowing down the grain passage of the drying chamber 3, the hot air acts to dry it, and it is returned from the cereal collection chamber 4 to the storage tank 2 via the elevator 5 and undergoes a tempering action. Such circulation is repeated until the predetermined moisture is reached.
[0019]
During the above drying operation, the combustion state of the burner 6 is monitored, and when red fire or lift combustion is confirmed, output correction of the burner motor rotational speed is performed. That is, after the tension switch 31 is “ON”, the drying switch 32 is “ON”. Thus, the “level” correction processing mode can be set, and an appropriate “level” can be obtained by pressing the timer increase / decrease switch 38 or 39 (FIG. 7). On the other hand, when the discharge switch 33 is “ON” instead of the drying switch 32, the “tilt” can be corrected (FIG. 8).
[0020]
In the output correction of the burner motor rotation speed, since the drying operation is in progress, the on-time Ton value changes with time, but the amount of change is in a very small range, so that the timer increase / decrease switches 38 and 39 Even at the time of adjustment, there is little need to regulate the on-time Ton output, but in order to increase the adjustment accuracy, as described above, the timer decrement switch 39 is pushed back to the initial value, or this output is set to a predetermined value, For example, it is good to set it as the structure which can be fixed to the value when the said tension switch 31 is pushed, and the intermediate value of a combustion range.
[0021]
In the “level” adjustment, the on-time Ton output should be confirmed at least at two different positions. The change of the on-time Ton output may be performed by changing the set temperature Tc. The setting values of the drying setting switch 35 and the extension amount setting switch 37 are shifted. When the adjustment by the timer increase / decrease switches 38 and 39 is completed, the stop switch 34 is turned on. As a result, the correction states of “level” and “tilt” are reset, and a new burner motor rotation speed N ′ is written in the storage unit 43.
[0022]
Thus, in addition to the operation of the tension switch 31, the burner motor output correction is executed with the existing switches such as the combined operation of the drying / discharging switches 32 and 33 or the timer increase / decrease switches 38 and 39. No dedicated switch is required. FIG. 9 shows an improvement in the maintainability of the burner 6. The substrate 22 is divided into two parts 22a and 22b in the front and rear, a vertical axis fulcrum 50 is provided on the left side of these overlapping portions, and the rear substrate 22b is the burner 6 main body. At the same time, it is turned to the side ((A) in the figure) to facilitate the inspection of the front side of the burner 6. Further, FIG. 10 shows that the handle 51 and the connection duct 26 are not fixed and the rear side substrate 22b is rotated downward around the horizontal axis fulcrum 52 (FIG. 10B). Similarly, the front side of the burner 6 is inspected. To try to make it easier.
[0023]
A discharge chute 53 is connected to the transfer start end side of the upper transfer device 10, and dried grains can be discharged out of the machine by opening an unillustrated shutter. Instead of the discharge chute 53, a discharge throttle 54 to be discharged to the storage tank may be connected. The discharge throttle 54 is provided with a dedicated motor 55, which is activated in accordance with the discharge switch 33 “ON” of the operation panel 30 to lift the dried grain.
[0024]
By the way, when the grain flow detector 45 is activated during the discharging operation or the clogging in the circulation path is detected by detecting the overload of the circulation system motor, the operation controller 42 of the dryer immediately stops the operation. A signal is output. However, when the exhaust throttle 54 is provided as described above, if the circulation system motor and the throttle motor 55 are stopped at the same timing, a clogging phenomenon occurs at the time of restart, so the clogging is detected. At this time, a delay stop signal is output to the throttle motor 55, and the throttle motor 55 is provided to stop after the circulation system motor is stopped.
[Brief description of the drawings]
FIG. 1 is a perspective view of a grain dryer.
FIG. 2 is a front sectional view of a grain dryer.
FIG. 3 is a front view of the control box of the control box.
FIG. 4 is a control block diagram.
FIG. 5 is a cross-sectional view of a burner.
FIG. 6 is a flowchart.
FIG. 7 is a flowchart.
FIG. 8 is a flowchart.
FIG. 9 is a plan view of a burner.
FIG. 10 is a side view of the burner.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Dryer frame, 2 ... Storage room, 3 ... Drying room, 4 ... Grain collection room, 5 ... Elevator, 6 ... Burner, 7 ... Suction fan, 8 ... Feeding valve, 9 ... Lower transfer device, 10 ... Upper transfer Device: 11 ... diffusion plate, 12 ... motor, 13 ... vaporization cylinder, 14 ... combustion disc, 15 ... air blow cylinder, 16 ... fuel nozzle, 17 ... electromagnetic pump, 18 ... opening, 19 ... burner case, 20 ... burner motor, 21 DESCRIPTION OF SYMBOLS ... Fan, 22 ... Substrate, 23 ... Filter case, 24 ... Filter, 25 ... Inlet, 26 ... Connection duct, 27 ... Hot air duct, 30 ... Control panel, 31 ... Tension switch, 32 ... Drying switch, 33 ... Discharge Switch, 34 ... Stop switch, 35 ... Drying setting switch, 36 ... Setting moisture switch, 37 ... Extension amount setting switch, 38 ... Timer increase switch, 39 ... Timer decrease switch, 40 ... Emergency stop switch, 41 ... Abnormal Nita, 42 ... operation control unit, 43 ... storage unit, 44 ... moisture meter, 45 ... grain flow detector, 46 ... hot air temperature detector, 47 ... exhaust air temperature detector, 48 ... wind pressure detector, 49 ... display unit

Claims (1)

In the grain dryer which dries by applying hot air heated by the burner 6 while circulating and transferring the tension grain, the burner 6 changes the on-time output Ton of the electromagnetic valve or the electromagnetic pump 17 and changes the fuel supply amount. The rotational speed N of the burner motor 20 to be configured to be changed and to drive the fan 21 for introducing the combustion air,
N = K × Ton + B
Is a method of controlling the rotational speed of the burner motor 20 to be calculated by the above-described method, wherein the characteristic values K and B of the equation can be changed and set in advance according to the combustion state and the like. The characteristic value is set by the timer increase / decrease switches 38 and 39 which are set in the change setting mode in accordance with the combined operation of the existing switches 31 , 32 and 33 for starting and stopping the mounted device and changing the operation time of the device. K and B are arbitrarily corrected, and the characteristic value K or B is returned to the initial value by the combined operation of the timer increase / decrease switches 38 and 39 during the correction process, and further , the combined operation of the existing switches 31 and 34 is performed. A burner motor rotation control method configured to cancel the change setting mode.

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