JP2006263183A - Method for controlling temperature on heating cylinder surface in ironer for business use - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a technique means capable of correctly keeping setting temperature in the temperature on the surface of a heating cylinder such as a chest, a press roll, or a calendar roll concerning the temperature control of the heating cylinder arranged in an ironer for business use which is arranged in a washing line, so as to perform finish drying and wrinkle stretching. <P>SOLUTION: The surface temperature of the heating cylinder is controlled by reading the pressure of steam in the heating cylinder such as the chest or the calendar roll and controlling pressure in the heating cylinder by steam flow rate control by a steam flow rate adjustment valve. The temperature corresponding to an object to be treated is set by performing changeover into the pressure corresponding to the surface temperature of the heating cylinder where the setting pressure is requested. Besides, the temperature is also controlled by monitoring the temperature of the heating cylinder with a non-contact thermometer and controlling the steam flow rate adjustment valve through the use of the detection value of the thermometer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a business ironer that is installed in a laundry line to finish and dry laundry, and relates to temperature control of a heating cylinder such as a chest or a calender roll provided in the ironer. .

  Business ironers are roughly classified into two types: a chest type and a calendar type in Japan. In the chest type, the laundry is fed between a chest provided with a groove having a semicircular cross section and a rotary press roll inserted into the groove, and the laundry is moved into the chest by the rotation of the press roll. It is pressed and transferred to the peripheral surface to stretch (iron).

  On the other hand, the calender type ironer wraps and transports laundry on 4 to 5 steam heating rolls that rotate synchronously in a state of being sandwiched between two front and back layers of guide belts, thereby spreading and finishing the laundry. Drying.

  These ironers are provided with heating cylinders called chests, press rolls, calender rolls, etc., and these heating cylinders are usually heated by blowing steam into them. Since the optimum temperature of the heating drum varies depending on the material of the laundry and the thickness of the cloth, it is desirable to provide an adjusting device for maintaining the surface temperature of the heating drum at a set value.

  FIG. 5 is a diagram schematically showing a temperature adjustment device for a rotary heating cylinder proposed in Patent Document 1. A drain pipe 10 that does not rotate through the axis is inserted into one end of the heating cylinder 1. ing. The drain pipe is bent downward in the heating cylinder, and the tip of the drain pipe opens near the inner bottom end of the heating cylinder. Steam is supplied from the steam pipe 2 through the rotary joint 11 and the hollow support shaft 12 into the heating cylinder 1. The vapor that has been deprived of heat by heat radiation from the heating cylinder 1 and condensed is accumulated in the lower portion of the heating cylinder 1 as drain 14. This drain is guided to the drain pipe 10 by the pressure of the steam supplied from the steam pipe 2 and discharged through the steam trap 15.

A temperature sensor 6 that detects the drain temperature or the drain pipe temperature is provided immediately above the steam trap 15. Further, the steam pipe 2 is provided with a steam flow rate adjusting valve 3 for adjusting the amount of steam supplied to the heating drum 1. The temperature of the drain discharged from the heating drum 1 is detected by the temperature sensor 6, and the detected value becomes the temperature set by the temperature setting dial 7 provided on the controller or the laundry type selection button 8. The opening degree of the flow rate adjusting valve 3 is adjusted so that the surface temperature of the heating cylinder 1 is maintained at the set temperature.
JP 2004-180829 A

  The problem of global warming due to the protection of petroleum resources and the increase in the amount of energy used has been addressed, and energy conservation has become an unavoidable issue for maintaining the environment. In addition, the diversification of materials and color patterns such as sheets and tablecloths is remarkable, and polyester blends are particularly increasing. However, polyester blends are vulnerable to heat and are limited by ironing temperatures. In the case of conventional linen products such as 100% cotton sheets, there is a need for a device that can be set to a high temperature, and in the case of goods that are vulnerable to heat, an apparatus that can be ironed by switching to a low temperature.

  Therefore, a technology that enables temperature setting according to the laundry to be processed, suppresses unnecessary temperature rise, and reduces steam consumption is indispensable. As described above, there is a method of controlling the surface temperature of the heating cylinder by detecting the drain temperature and controlling the amount of steam, but in this conventional method, hunting occurs, the temperature is unstable, and the accurate surface temperature is controlled. It is difficult to maintain.

  That is, as shown in FIG. 6, in the case of control based on detection of the drain temperature, the surface temperature of the heating cylinder indicated by the solid line L1, the drain temperature indicated by the long broken line L2, and the steam pressure indicated by the short broken line L3 are hunting. And control is not stable. In addition, the vertical axis | shaft of FIG. 6 is a vapor | steam pressure and its saturation temperature, a horizontal axis is time, and time has passed from the right to the left. The time scale is shown 30 minutes long to the left of the horizontal axis. The numerical value shown with the arrow indicating the time range below the horizontal axis is the set pressure in that time range.

  This invention makes it a subject to obtain the technical means which can maintain the surface temperature of heating cylinders, such as a chest of an industrial ironer, a press roll, a calender roll, more accurately at preset temperature.

  In the present invention, the surface temperature of the heating cylinder is controlled by reading the pressure of the steam in the heating cylinder 1, such as a chest or calendar roll, and controlling the pressure in the heating cylinder by controlling the steam flow rate by the steam flow control valve. is doing. Then, by switching the set pressure to a pressure corresponding to the required surface temperature of the heating cylinder, the temperature can be set according to the processed object.

  Preferably, the temperature of the heating cylinder is monitored by a non-contact type thermometer, and the temperature control by controlling the steam flow rate adjusting valve using the detected value of the thermometer is also possible. Is possible.

  Moreover, the temperature control for each roll of the multi-stage roll is also possible, whereby the rolls of the multi-stage roll can be optimally distributed to reduce the amount of steam used and improve the processing efficiency.

  That is, the temperature control method for the surface of the heating cylinder according to the first aspect of the present invention is a method for controlling the temperature of the surface of the heating cylinder 1, such as a business ironer chest, press roll, calendar roll, and the like. A pressure sensor 4 for detecting the pressure of the heating drum is provided, and the amount of steam supplied to the heating drum is adjusted so that the detected value of the pressure sensor becomes a pressure corresponding to the temperature of the heating drum surface required for the laundry to be processed. It is characterized by adjusting.

  The temperature control method for the surface of the heating cylinder according to the invention of claim 2 of the present application is a method for controlling the temperature of the surface of the heating cylinder 1, such as a business ironer chest, press roll, calender roll, etc. Steam to be supplied to the heating drum is provided so that a contact temperature sensor 9 for monitoring the surface temperature is provided, and the detected value of the temperature sensor becomes a temperature corresponding to the temperature of the heating drum surface required for the laundry to be processed. It is characterized by adjusting the amount.

  The invention of claim 3 of the present application is a temperature control method having the above-described configuration in an ironer having a plurality of stages of heating cylinders, wherein each of the plurality of stages of heating cylinders 1a, 1b,. .. and steam flow rate adjusting valves 3a, 3b... Are provided, and the temperature of each heating cylinder is individually controlled.

  According to the temperature control by pressure detection of this invention, the temperature of the heating cylinder is kept constant and hunting occurs compared to the conventional method of detecting the drain temperature or drain pipe temperature discharged from the heating roll and controlling the temperature. The control stability is high. Furthermore, the exact temperature of the heating roll body can be confirmed by monitoring the temperature of the heating roll with a non-contact thermometer.

  In addition, by controlling the temperature for each roll provided in multiple stages, for example, it is possible to control the temperature such that the first roll with much moisture has a high temperature, and the latter roll has a low temperature. can get.

  FIG. 1 is a schematic view showing an example in which the method of the present invention is applied to the surface temperature control of the rotary heating cylinder shown in FIG. In the figure, the same members as those in FIG. 5 are denoted by the same reference numerals, 1 is a rotary heating cylinder such as a calender roll or a press roll, 2 is a steam pipe, 3 is provided on the steam pipe 2 and is a heating cylinder 1. 4 is a pressure sensor for detecting the pressure of superheated steam after passing through the steam flow rate adjusting valve 3, 5 is a control box, and 7 is a temperature setting for the heating cylinder 1. A dial, 8 is a selection button for selecting the type of laundry, 10 is a drain pipe that passes through the rotation axis of the heating drum 1 and has a tip opening near the bottom of the heating drum 1, and 11 is a heating drum 1 and a steam pipe 2. , 12 is a hollow support shaft that supports the heating cylinder 1, 15 is a steam trap provided in the drain pipe 10, and 17 (not indicated in FIG. 5) is the steam flow control valve 3. It is a supply vapor pressure gauge provided on the inlet side.

  The pressure sensor 4 detects the pressure in the pipe 2 on the outlet side of the steam flow rate adjusting valve 3, and the pressure loss of the rotary joint 11 can be ignored or corrected. Can be detected. A detection signal of the pressure sensor 4 is input to the control device 5. In the temperature / pressure converting means 16 of the control device 5, the relationship between the vapor pressure in the rotating drum and the temperature of the rotating drum surface is registered in advance as a table or a calculation formula, and the temperature set by the temperature setting dial 7 The vapor pressure corresponding to the temperature set in advance for each button as the temperature for processing the laundry selected by the selection button 8 is obtained by the temperature-pressure conversion means 16. The control device 5 controls the opening degree of the flow rate adjusting valve 3 so that the detection value of the pressure sensor 4 becomes the pressure obtained as described above.

FIG. 2 is a diagram showing a result of measuring a change in temperature of the surface of the heating cylinder when the set pressure is changed by the control of FIG. In the figure, the vertical axis represents the steam pressure and its saturation temperature, the horizontal axis represents time, and time has passed from right to left. The time scale is shown 30 minutes long to the left of the horizontal axis. Numerical values shown with arrows indicating the time range under the horizontal axis at the set pressure, was varied ^{1.25kg / cm 2 → 2kg / cm} 2 → 3kg / cm 2 → 5kg / cm 2 stepwise set temperature It is shown that. The saturation temperature with respect to the set pressure in each range is indicated by a thin line L4. A solid line L1, a long broken line L2, and a short broken line L3 indicate how the surface temperature of the heating cylinder, the drain temperature, and the steam pressure in the heating cylinder have changed due to the change in the set pressure and the passage of time. When the set pressure is changed, the steam pressure does not immediately follow the set pressure and there is a time delay. This is because the PID (control value and its integral value and derivative) of the control device 5 does not overshoot when the set pressure is changed. This is because the value is controlled.

  FIG. 3 is a diagram showing an example of control provided with a temperature sensor 9 for monitoring the temperature of the surface of the heating cylinder 1. The temperature sensor 9 is a non-contact type temperature sensor and detects radiant heat from the end face of the heating cylinder 1 in the example of the figure. Since the outer peripheral surface of the heating drum 1 is a glossy surface, the temperature of the end surface of the heating drum 1 is measured in consideration of the fact that errors due to disturbance are likely to occur when the temperature is detected by a non-contact sensor. .

  The detection signal of the temperature sensor 9 is given to the control device 5, and the control device 5 preliminarily controls the detection value of the temperature sensor as a temperature set by the temperature setting dial 7 or a temperature suitable for the laundry selected by the selection button 8. The opening degree of the steam flow rate adjusting valve 3 is controlled so that the temperature set in the device 5 is reached. Even when the opening degree of the steam flow rate adjusting valve 3 is controlled based on the pressure detected by the pressure sensor 4, the opening degree of the steam flow rate adjusting valve 3 can be corrected by the detected value of the temperature sensor 9.

  When the heating cylinders 1 are provided in multiple stages, a pressure sensor 4 and a steam flow rate adjusting valve 3 are provided for each heating cylinder, and the vapor pressure in each heating cylinder is set as the surface temperature of each heating cylinder. The opening degree of the steam flow rate adjusting valve 3 in each stage is adjusted so that the steam pressure corresponding to the measured temperature is obtained.

  FIG. 4 shows an embodiment of a roll ironer provided with five rotating heating rolls 1a to 1e. In the drawing, the laundry transfer line in the apparatus is omitted, and the arrangement of the heating rolls is omitted. Only the form and the main part of the temperature control device are shown. Arrows A and B in the figure indicate the supply and discharge directions of the laundry into the apparatus. Reference numeral 2 denotes a pressurized steam pipe for heating the heating rolls 1a to 1e. Each of the branch pipes connected to each of the rolls 1a to 1e has a steam flow rate adjusting valve 3a to 3e and a pressure on the downstream side (roll side). Sensors 4a to 4e are provided. The control device 5 adjusts the opening degree of each of the steam flow rate adjusting valves 3a to 3e so that the detected pressure of each of the pressure sensors 4a to 4e becomes a pressure corresponding to the temperature set for each of the rolls 1a to 1e. In the example of FIG. 4, the first roll 1a and the fourth roll 1d are provided with non-contact temperature sensors 9a, 9d, and these detected temperatures are sent to the control device 5 and calculated from the detected pressure of the pressure sensor. The difference between the temperature and the temperature detected by the temperature sensor is monitored, and when this difference becomes large, correction or warning is performed as appropriate.

The block diagram which shows typically the temperature control method of this invention Diagram showing set pressure and temperature change of heating drum surface in control of FIG. Block diagram showing an example of providing a non-contact temperature sensor The block diagram which shows embodiment in the ironer which has a multistage roll Block diagram showing conventional temperature control of the heating cylinder by drain temperature FIG. 5 is a diagram showing changes in the set temperature and the surface temperature of the heating cylinder in the control of FIG.

Explanation of symbols

1 Heating cylinder 3 Steam flow rate adjusting valve 4 Pressure sensor 9 Contact temperature sensor

Claims (3)

  A method for controlling the temperature of the surface of a heating cylinder (1) such as a chest of ironers for business use, a press roll, a calender roll, etc., provided with a pressure sensor (4) for detecting the pressure in the heating cylinder, and detecting the pressure sensor The amount of steam supplied to the heating drum is adjusted so that the value corresponds to the temperature of the heating drum surface required for the laundry to be treated. Temperature control method.   A method for controlling the temperature of the surface of a heating cylinder (1) of a commercial ironer chest, press roll, calender roll, and the like, provided with a contact temperature sensor (9) for monitoring the surface temperature of the heating cylinder, and the temperature sensor The amount of steam supplied to the heating drum is adjusted so that the detected value becomes a temperature corresponding to the temperature of the surface of the heating drum required for the laundry to be processed. Surface temperature control method.   In an ironer having a plurality of stages of heating cylinders, a pressure sensor (4a, 4b,...) And a steam flow rate adjusting valve (3a, 3b,. The temperature control method for the surface of the heating cylinder according to claim 1, wherein the temperature of each heating cylinder is individually controlled.

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