JP4816074B2 - Grain dryer - Google Patents

Description

  The present invention relates to a grain dryer having a tension amount sensor that detects the amount of grain tensioned in a drying tank.

As a tension sensor of a grain dryer, a weight is provided at the tip of the suspension string, and the weight is lowered into the grain drying tank so as to reach the top surface of the tension grain layer. A technique (for example, refer to Patent Document 1) is known in which a winding amount (length) of a reel is measured to detect a grain tension amount. In addition, this amount detection is performed after the start of the drying action.
JP 2001-82877 A (first page, FIG. 1).

  In the form where the weight of the tension sensor is suspended by a string, in a dryer that is dried while circulating the grains, the grains being circulated are in contact with the hanging strings and easily damaged by wear. This is likely to cause a failure of the sensor and shortens the durability.

In the invention according to claim 1, a weight is provided at the tip of the hanging string, and the weight is lowered to reach the upper surface of the tension grain layer stretched in the drying tank (2). In the circulation dryer of the circulation transfer type provided with the tension sensor (3) for detecting the grain amount, the full sensor (13) for detecting that the grain in the drying tank (2) is full. ) , And when the filling operation is completed without the full sensor (13) detecting the full quantity, the tension quantity detection operation by the tension quantity sensor (3) is performed without circulating the grain,
When the full sensor (13) detects the full amount during the tension operation, the tension amount corresponding to the maximum amount is automatically set, and the measurement of the tension sensor (3) is not performed. And a grain dryer.

  According to the first aspect of the present invention, when the full sensor (13) detects the full amount, the tension amount corresponding to the maximum amount is automatically set, and the tension sensor (3) is not measured. As a result, unnecessary measurement is not performed and the durability of the tension sensor (3) is improved.

  An embodiment of the present invention will be described with reference to the drawings. The grain dryer has a circulation transfer configuration in which the grain is dried by flowing hot air while flowing down the drying tank 2. The box-shaped dryer body constitutes a drying chamber 5 that dries through hot air while allowing the grains in the drying tank 2 to flow down at the bottom of the drying tank 2 that stores the grains. At the lower end of the drying chamber 5, a feeding valve 16 that feeds the grain is provided, and the grain that is fed by the rotation of the feeding valve 16 is conveyed to the front side of the machine body by the spiral 17 and supplied to the grain raising machine 11. . The groining machine 11 is provided with a supply port (such as a hopper) for supplying grains such as straw at the lower part, and receives the grains supplied from the outside or the grains fed from the drying chamber 5 to rise. Then, it is inherited by the spiral 12 provided in the upper part of the drying tank 2 and supplied to the diffusion plate 14 rotating at the terminal end of the spiral 12. The grains received by the diffusion plate 14 are diffused and supplied over the entire surface of the drying tank 2. A combustion device 7 composed of a burner is provided at the center of the front of the machine body at the side of the groining machine 11, and a suction exhaust fan 4 is disposed on the opposite side of the combustion device 7. Is exhausted from the exhaust fan 4 to the outside of the apparatus. In such a dryer, a control box 9 can be provided on the front side wall portion of the machine body to perform a drying operation and control. In addition, a moisture meter 8 is provided in the middle of the grain raising machine 11 to detect grain moisture while allowing a part of the grain during grain raising to flow in. A soot flow sensor 10 is provided to detect the above. In addition, the ceiling of the drying tank 2 detects that the stored grain is full, and a full sensor 13 capable of alarming the buzzer by this detection, and the amount of tension for detecting the stored grain amount. A sensor 3 is provided.

  The operation panel surface of the control box 9 will be described. A tension switch 37 for performing the tension work, a drying switch 6 for starting the combustion of the combustion device 7, and a discharge switch for discharging the grains from the drying tank 2 to the outside after the drying work. 39 and a stop switch 40 for stopping the tensioning operation, the drying operation, and the discharging operation.

  This tension amount sensor 3 is a string hanging form in which a sensor box 19 is attached to a ceiling plate 41 of a grain dryer, and a hanging string 21 having a weight 20 is wound around a reel 22. The weight 20 is made to reach the upper surface of the stretched grain layer P in the drying tank 2 so that the length, time, etc. of the string 21 can be measured and the grain amount can be calculated by the arithmetic unit 23. . A guide spring 28 for guiding the suspension of the string 21 and a guide plate 31 are provided so as to be rotatable around the support shaft 26, and the suspension of the suspension lowering guide spring 28 for the string 21 is moved via the actuator 29. The lower limit switch 24 is operated to constitute a descending detection sensor that detects looseness of the string 21 when the weight 20 arrives at the upper surface of the grain layer P. Further, the upper limit sensor 30 that is activated by the swinging of the guide plate 31 is configured to engage with the lifting of the weight 20 and to swing upward to detect the rising upper limit position. Reference numeral 35 denotes a clip ball which is slidably brought into contact with the rotating peripheral surface of the reel 22 and is pressed by a spring 34. The drooping movement of the string 21 due to the weight of the weight 20 is lowered against the braking resistance by the clip ball 35. The reel 22 is provided with a magnet 36 for detecting the rotational speed.

  Here, the drying control apparatus according to the present invention is provided with a tension amount sensor 3 for detecting the amount of grain stretched in the drying tank 2 by the tensioning apparatus 1, and the grain is placed in the drying tank 2. In the grain dryer that performs drying while circulating, after stopping the tensioning device 1 after the grain tension in the drying tank 2, the tension amount sensor 3 starts the tension amount detection operation. In addition, the configuration is such that the circulation drying of the grains is started by detecting the amount of tension of the tension amount sensor 3. The grain drying action of the dryer is as follows. After the tension transfer of the grain to the drying tank 2 is completed by the tension device 1 and this tension amount is detected by the tension sensor 3, the combustion device is burned. Done. And the operation of detecting the amount of tension by the tension amount sensor 3 is started after the tensioning device 1 is stopped. For this reason, the tension amount sensor 3 can be in a state in which the tension amount is not detected during the tensioning action of the tensioning device 1.

  Further, the exhaust fan 4 is driven at the time of detecting action by the tension amount sensor 3. As described above, while the tension amount sensor 3 detects the tension amount, the tensioning action of the tension device 1 is stopped, and the grain in the drying tank 2 is also circulated and transferred. I will not. In this state, by operating the tension amount sensor 3, the exhaust fan 4 is simultaneously driven to ventilate the drying tank 2.

  The tension amount detection operation by the tension amount sensor 3 is performed by operating the switch 6 for starting the drying action after the tensioning action by the tensioning device 1 is stopped, and the combustion apparatus after the detection action is finished. 7 is automatically started to burn. When the grain is stretched in the drying tank 2, the stretching switch 37 is operated to perform the stretching action. The action of detecting the amount of tension by the tension sensor 3 is started by operating the drying switch 6 after the tensioning action is finished and the stop switch 40 is operated to stop the tensioning device 1. When the drying switch 6 is operated, the combustion apparatus 7 for drying is not driven immediately, and combustion is started when the operation of detecting the tension amount by the tension amount sensor 3 ends.

  The tension device 1 includes an elevator 11, a spiral 12, a diffusion plate 14, and the like, and is driven by operating a tension switch 37 of the control box 9. In addition to the elevator 11, the spiral 12, the diffusion plate 14, and the like of the tensioning device 1, the circulating conveyance device 15 includes the feeding valve 16 and the spiral 17. The tension amount sensor 3 is in a state in which the string 21 is wound on the reel 22, but when the tension device 1 finishes the tension action and stops, the drying start switch 6 of the control box 9 is operated. As a result, the exhaust fan 4 is driven and the tension amount sensor 3 is activated. The reel 22 motor is unwound and the string 21 is extended by the weight of the weight 20 so that the weight 20 is in contact with the upper surface P of the grain layer on which the weight 20 is stretched. The descent length of the string 21 at this time is measured, and the amount of tension in the drying tank 2 is detected. The amount of tension detected by the tension amount sensor 3 is input to a control unit (not shown) of the control box 9 as a tension condition for drying. By this setting operation, the drying action is automatically started. That is, while the exhaust fan 4 is being driven, the combustion device 7 is started, and the circulating and conveying device 15 is driven.

  Such a detection operation of the tension sensor 3 is measured by automatically pulling and lowering the string 21 by the automatic stop by the timer or the turning operation of the stop switch during the operation of the exhaust fan 4 as shown in FIG. It can be configured to transition to a stroke. Thus, by automatically detecting and setting the tension amount after the end of the exhausting operation, it is not necessary to set the tension amount before drying, and operability can be improved.

  Next, mainly based on FIG. 8, during the tension operation, a load sensor for detecting the motor load of the elevator 11 of the tension device 1 is provided, and the state where the motor load is equal to or less than a predetermined value continues for a certain period of time. By doing this, the detection operation of the tension amount sensor 3 is started. The detection of the amount of tension can be automatically started in a state in which the grain does not pass through the vicinity of the tension amount sensor 3. Also, as shown in FIG. 9, together with the detection by the load sensor, the circulatory conveyance detection of the grains is performed, and the string 21 is lowered under the condition that these are not more than a predetermined value, and the tension amount is detected. It is also possible to configure it. Since the moisture meter 8 can be used for detection of the circulation conveyance state, as shown in FIG. 10, when the moisture meter 8 does not detect moisture for a certain period of time or a certain number of times, the tension sensor 3 It is also possible to start the detection operation.

  Further, during the tension operation, when the full sensor 13 detects that the inside of the drying tank 2 is full, the tension amount corresponding to the maximum amount (the number of stones) is automatically applied to the dryer. It is good also as a structure which can set automatically. For this reason, if the full sensor 13 is turned on during measurement by the tension sensor 3, the measurement by the tension sensor 3 is not necessary, and the measurement action can be stopped.

  Further, during the detection operation of the tension amount sensor 3, the upper limit sensor 30 of the tension amount sensor 3 is periodically monitored. When the sensor 30 switch is ON, the motor is output in reverse and driven for a predetermined time. In addition, if it does not turn OFF even after being driven for a predetermined time, an abnormality is displayed and notified. When the string 21 is cut halfway, the upper limit sensor 30 switch is turned ON. For this reason, it is determined that the string 21 has been cut when the motor is driven to rise and does not turn on. Further, it is possible to provide a string dandruff sensor for detecting a string dandruff state before the string 21 is completely cut, and to make an alarm by detecting this string dandruff state.

The front view of a dryer. Side view of the dryer. The front view which shows the action state of a tension amount sensor. The front view which shows the action state of a tension amount sensor. The perspective view of a tension amount sensor. flowchart. flowchart. flowchart. flowchart. flowchart. Operation panel

DESCRIPTION OF SYMBOLS 1 Tension device 2 Drying tank 3 Tension amount sensor 4 Exhaust fan 5 Drying chamber 6 Drying start switch 7 Combustion device 20 Weight 21 String 22 Reel

Claims (1)

A tension amount is detected by providing a weight at the tip of the hanging string and lowering this weight to reach the upper surface of the tension grain layer stuck in the drying tank (2). In the grain dryer of the circulation transfer form provided with the sensor (3), a full sensor (13) for detecting that the grain in the drying tank (2) is full is provided,
When the fullness sensor (13) does not detect the full amount and the tensioning operation is completed, the tension amount sensor (3) performs the tension amount detection operation in a state where the circulation of the grain is not performed,
When the full sensor (13) detects the full amount during the tension operation, the tension amount corresponding to the maximum amount is automatically set, and the measurement of the tension sensor (3) is not performed. A grain dryer.

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