JP5676547B2 - Defrosting method for seat shutter - Google Patents

Description

  The present invention relates to a method for defrosting (frosting) a seat shutter installed at an entrance / exit of a refrigeration facility such as a refrigerator, a freezer, or a low-temperature showcase.

Conventionally, sheet shutters (shutter devices) installed at entrances and partitions of buildings such as factories and warehouses have a sheet drum on which sheets are wound so as to be wound and fed out, and are rotated forward and backward by an electric motor to guide sheets on both sides. The doorway (frontage) is opened and closed by moving up and down along the rail. When used in food processing factories that handle refrigerated and frozen products, sheet shutters are used for refrigeration equipment such as low-temperature warehouses (freezer rooms and refrigerator rooms) and work areas such as processing rooms and areas that access the warehouse. Installed between. In addition, seat shutters used at low temperatures can be used by preventing the occurrence of condensation on the rail box (seat guide portion) by attaching a heater in the rail box body that houses the guide rail. It is known (see, for example, Patent Document 1).
Further, a sheet shutter that automatically removes adhering substances such as dust adhering to the surface of the sheet with a brush in order to maintain hygiene is already known (see, for example, Patent Document 2).

JP-A-2005-29960 Japanese Utility Model Publication No. 4-5675

The seat shutter shown in Patent Document 1 prevents the condensation of the rail box by a heater, but the removal of frost attached to the surface of the sheet used at a low temperature of about −20 ° C. is performed at room temperature. It cannot be done because it interferes with the cooling effect.
On the other hand, since the sheet shutter shown in Patent Document 2 presses the brush against the sheet wound around the sheet drum, dust can be automatically removed during the opening and closing operation of the sheet. However, when this sheet shutter is used in the refrigeration equipment, the dust removing means for simply bringing the brush into contact with the sheet cannot sufficiently remove frost adhering to the sheet surface at low temperatures.
In other words, when a sheet shutter used at low temperatures has a high frequency of opening and closing operations, the frost is shaken off and defrosted each time by vibration generated during the opening and closing operations. Can be maintained. On the other hand, if the sheet is opened / closed in the normal opening / closing mode after a long period of non-working with a low opening / closing operation frequency, the sheet on which frost is frozen and adhered in a wide range is wound by the sheet drum. At this time, the winding is sequentially performed while increasing the winding diameter. For this reason, the normal operation of raising the sheet due to the set rotation of the sheet drum is hindered, and the motor is overloaded by the winding resistance, so that there is a problem that it is difficult to smoothly open and close the sheet.
In view of the above circumstances, the present invention provides a sheet shutter defrosting method that can automatically perform a defrosting operation in a timely manner using a seat lifting / lowering operation together with a normal opening / closing mode of the seat shutter.

  In order to solve the above-described problem, the sheet shutter defrosting method of the present invention firstly includes a seat case 4 that supports a seat drum 5 that winds and feeds the seat 2 by forward and reverse rotation driving of the motor 7, and A seat guide unit 11 is provided on the left and right sides of the seat case 4 to guide the ascending / descending operation of the seat 2, and the grounding unit 12 starts from a lower limit position in a fully closed state where the grounding unit 12 at the lower end of the seat 2 is grounded to the floor surface. In the defrosting method of the seat shutter that removes frost attached to the seat 2 while opening and closing the same with the upper limit position where it is fully lifted and fully opened, the seat 2 is moved between the raising and lowering strokes. From the normal opening / closing mode in which the opening / closing operation is performed, the grounding portion 12 of the fully-closed seat 2 is stopped in the middle of ascent, and the seat 2 is lowered from the stop position in the middle of the ascent to lower the grounding portion 12. By switching to the defrosting operation mode in which the basic defrosting operation is performed in which the surface is grounded or stopped at a position close to the floor surface, the seat 2 is given vibrations in the vertical and front-rear directions accompanying the basic defrosting operation. It is characterized by removing frost adhered to the surface by removing it.

  Secondly, during the operation in the defrosting operation mode, the seat 2 is lowered from the stopping position while being raised and the ground contact portion 12 is caused to collide with the floor surface, thereby causing the seat 2 to perform a defrosting operation that gives strong vibration. It is characterized by defrosting.

  Third, another stop position having a height different from the stop position is set for the stop position in the middle of the basic defrosting operation in the defrosting operation mode, and the grounding unit 12 is moved up and down between the both stop positions. The sheet 2 is defrosted by applying vibration to the sheet 2 by being stopped suddenly.

  Fourth, when returning from the defrosting operation mode to the normal opening / closing mode, the lowering operation of the seat 2 in the defrosting operation immediately before the return is performed by the slow stop operation that is the same slow speed operation as the normal opening / closing mode. Is stopped at the lower limit position.

  Fifth, in the operation in the normal opening / closing mode, the sheet 2 is rolled up beyond the upper limit stop position when the sheet 2 is not frosted by winding the sheet drum 5 with the sheet 2 being frosted. At that time, the stopper 32 provided on the sheet 2 side is brought into contact with the sheet stopper 31 provided on the sheet case 4 or the sheet guide portion 11 side to stop the rotation of the sheet drum 5 and reverse a certain amount, The stopper 32 is separated from the sheet stopper 31, the sheet 2 is stopped at the temporary upper limit stop position, and the standby state for the next lowering operation is maintained.

The sheet shutter defrosting method of the present invention configured as described above has the following operational effects.
By switching from the normal opening / closing mode, which opens and closes the seat between the lifting strokes, to the frost removal mode, the frost attached to the seat can be removed by vibration, so that manual frost removal work is omitted. Can do. Since the defrosting operation is performed by moving up and down in the middle of the lifting stroke, it is possible to prevent deterioration of stored items while suppressing the outflow of cold air and preventing energy loss of the low-temperature storage facility.
During operation in the frost removal operation mode, the seat is lowered beyond its lower limit position and the grounding portion collides with the floor surface to give vibration to the sheet, and in the frost removal operation mode, the seat is not fully opened. After ascending to the stop position in the middle of ascent, the ground contact portion is lowered to collide with the floor surface, and strong vibration is applied to defrost the entire sheet including the ground contact portion and the lower end portion.
The basic defrosting operation in the defrosting operation mode is raised and lowered between the stop position in the middle of the defrosting operation and another stop position having a different height, and the seat is vibrated over a wide range in the vertical direction of the seat. It can be applied to efficiently remove frost.
When returning from the frost removal operation mode to the normal opening / closing mode, the lowering operation of the seat of the frost removal operation immediately before the return is stopped at the lower limit position by the slow stop operation at a slow speed similar to the normal opening / closing mode, Stop accurately at the lower limit without extra impact. As a result, the sheet can be brought into close contact with the sheet by extending the slack and wrinkles of the sheet caused by the frost removal pattern, and can smoothly shift to the normal open / close mode.
Furthermore, during operation in the normal open / close mode, the sheet is prevented from being excessively wound due to frost on the sheet and the winding diameter is increased to prevent overload on the motor, and the standby posture for the next lowering of the sheet Can be maintained well.

FIG. 3 is a front view illustrating a sheet shutter to which the present invention is applied, with a part thereof broken. It is the sectional view on the AA line which shows the structure of the principal part of FIG. FIG. 5 is a front view showing a left side configuration of the sheet shutter with a part thereof broken. It is sectional drawing which shows the structure of a support | pillar and a sheet | seat guide part. It is sectional drawing which shows the structure of a support | pillar and a sheet | seat guide part. It is a time chart figure which shows the normal opening / closing mode and frost removal operation mode of a seat shutter. (A)-(h) is a schematic diagram which shows each operation | movement of the defrosting operation mode of a sheet shutter. (I)-(o) is a schematic diagram which shows each operation | movement of the defrosting operation mode of a sheet shutter. It is a front view which partially fractures and shows the sheet shutter provided with the sheet | seat with a core material. It is a side view which shows the roller structure of a core material.

  An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a sheet shutter that is mainly installed at the entrance (exit) of refrigeration equipment such as a refrigerator, a freezer, or a low-temperature showcase. The seat shutter 1 includes a seat 2 as a shutter member, a support column 3 (side frame) having a hollow, square C-shaped cross section that supports the left and right sides of the shutter 2 and guides up and down movement in the vertical direction, and the seat 2 is wound up. It is composed of a seat case (seat frame) 4 and the like that are housed so as to be freely drawn out.

  The seat shutter 1 is constructed such that left and right columns 3 are installed in parallel along columns and walls formed at the entrance of the building, and both columns 3 are installed sideways along the beam or wall of the building. The seat case 4 is detachably attached in a state where both sides of the seat case 4 are placed, and is formed into a gate shape as a whole. A seat drum (feeding device) 5 as a shutter opening / closing mechanism is housed inside the seat case 4. The sheet drum 5 winds and unwinds the sheet 2 by forward and reverse rotation, and the sheet 2 is guided by a sheet guide portion formed on the left and right support columns 3 so that both sides can be moved up and down to move up and down to open and close the entrance / exit. I do.

First, a specific configuration of the sheet shutter 1 will be described with reference to FIGS. The seat case 4 forms a hollow case chamber by detachably attaching end plates 6a and 6b to both sides of a case main body 6 formed in a cylindrical shape having a square cross section in a side view. A hollow cylindrical seat drum 5 rotatably supported by left and right end plates 6a and 6b is accommodated in the case chamber in the left-right direction. An opening 6 c that communicates with the inside of the left and right support columns 3 and allows the seat 2 to move up and down is formed in the lower rear portion of the case body 6.
The right end plate 6a is supported on the inner side by facing the inside of the seat drum 5 by attaching the base of the cylindrical motor 7 with bolts. The motor 7 engages a driving body 8 formed of an uneven ring provided on the driving shaft 7 a with the inner surface of the seat drum 5 to drive the seat drum 5 to rotate forward and backward.

  In the example shown in the drawing, the left end plate 6b is pivotally supported on the inner surface by a support shaft 8b of a mounting plate 8a attached to the left end portion of the seat drum 5, and the left end portion of the case body 6 is closed. Mounted. As a result, the seat drum 5 is horizontally supported in the seat case 4, and as the motor 7 rotates forward and backward, the seat 2 is fed and lowered and taken up and opened and closed. In the seat shutter 1 of this embodiment, the opening / closing operation of the seat 2 is performed by selecting a normal opening / closing mode and a defrosting operation mode, which will be described later, by a control unit (not shown) provided in the control panel 9. For example, it can be installed at the entrance / exit of facilities for freezing and refrigerated storage of articles at a low temperature of about −20 ° C.

  That is, in the control unit in the control panel 9, the sheet opening / closing operation in the normal opening / closing mode is provided in the manual operation command by the operation switch unit 9a installed in the control panel 9 and the sheet guide unit 11 similarly to the conventional one. This is done by rotating the motor 7 forward and backward based on a normal rotation signal and a reverse rotation signal based on automatic detection by a detection unit (sensor) 9b that detects a passing body. On the other hand, the defrosting operation of the seat 2 in the defrosting (defrosting) operation mode is performed from the normal open / close mode by the mode changeover switch 9e switching operation provided in the defrosting control unit (circuit) in the control panel 9 from FIG. This is performed according to mode control commands in various frost removal operation modes shown in FIG. In the defrosting operation mode, the state notification is made by turning on the buzzer 9c provided on the upper portion of the column 3. And the generation | occurrence | production of frost and dew condensation can be prevented by providing the heater 9d in required places, such as the support | pillar 3 of the seat shutter 1, and the motor 7, as needed.

  The sheet 2 is made of a rectangular curtain body made of a synthetic resin material having flexibility, weather resistance and, if necessary, translucency or light shielding properties. The embodiment has durability even at a low temperature of about −20 ° C. A low-temperature sheet is used. In the illustrated sheet 2, the upper end (base side) is attached to the peripheral surface of the sheet drum 5 along the axial direction, and a large number of piece-like guide protrusions 10 having a known structure are fixed along both side edges of the curtain body. It is provided continuously through an interval. And the guide protrusion 10 is engaged and accommodated in the sheet | seat guide part (shutter guide part) 11 comprised in the inward facing surface side of each support | pillar 3 so that a raising / lowering slide is possible. As a result, the seat 2 keeps the sheet tension in the lateral direction and smoothly moves up and down while preventing the sheet 2 from coming off.

  Also, a lower end of the seat 2 is provided with a grounding portion 12 that also serves as a weight portion and biases the seat 2 downward. The grounding portion 12 is in a closed state in which the seat 2 is lowered to a flat ground or floor. Keep the airtightness along the surface (hereinafter referred to as the floor) and ground. As shown in FIG. 2, the grounding portion 12 is constructed by pasting both folded end portions of a bag-shaped grounding sheet 12 b, in which a weight 12 a such as an iron pipe is horizontally installed, being overlapped before and after the lower end of the sheet 2. Is done. A cushioning member 12c made of sponge or rubber is interposed between the weight 12a in the grounding sheet 12b, and a space is formed between the lower part of the weight 12a and the grounding sheet 12b. Thus, as shown by the dotted line in FIG. 2, when the grounding portion 12 is lowered, the grounding sheet 12b is brought into close contact with the floor surface while preventing direct contact between the weight 12a and the floor surface. Let the airtightness be maintained.

  As shown in FIGS. 2 to 5, the seat guide portion 11 has a groove 13 formed in the vertical direction on the inward surface of the support column 3, and an outer rail 14 formed in a U-shaped cross section is fitted into the groove 13. The inward ends of the side walls 14a that make a pair in front and rear are fixed. Then, the inner rail 16 and the upper inner rail 17 connected to the upper portion of the inner rail 16 are detachably fitted and attached in the outer rail 14. The outer rail 14, the inner rail 16, and the upper inner rail 17 are made of a synthetic resin material having wear resistance and predetermined flexibility.

As shown in FIGS. 4 and 5, the inner rail 16 engages the guide projections 10 attached to the seat 2 so as to be slidable up and down on the left and right sides of the partition wall 19 provided in the vertical direction in the rail member in plan view. An inward engagement guide 21 is provided for accommodating in the above manner. Further, the outer rail 14 is integrally formed with an inner support portion 22 that is elastically attached in the seat tension direction.
The engagement guide 21 is formed by a pair of guide walls 23 having hook-shaped tip portions projecting inwardly from both sides of the partition wall 19. The guide walls 23, 23 form a sheet groove 23 a that guides the lifting and lowering of the seat 2 between hook portions formed at the tip, and guide protrusions communicated with the sheet groove 23 a between the base side and the partition wall 19. A protruding groove 23b is formed to accommodate 10 in a slidable manner.

The illustrated protruding groove 23 b forms a hook portion with the groove width of the sheet groove 23 a parallel to the guide protrusion 10. In the normal mounting posture of the inner rail 16 shown in FIG. 4, the seat 2 is slid up and down in a state in which the guide protrusion 10 is located in the middle of the left and right of the protrusion groove 23 b of the engagement guide 21 and the inward release is restricted.
Further, when the seat 2 is subjected to a load in the front-rear direction due to human contact or strong winds when moving up and down, both ends of the seat 2 are pulled inward, so that the guide protrusion 10 tends to come out of the seat groove 23a. At this time, the guide protrusion 10 regulates the escape by the hook shape of the pair of guide walls 23 at the front and rear, so that the seat 2 can be guided up and down while preventing the seat from coming off.

The inner support portion 22 is formed by a partition wall 19 and peripheral walls 24 and 24 projecting outward from both front and rear sides thereof. A pin groove 27 into which the mounting pin 26 is inserted is formed between front and rear end portions of the hook-shaped cross section formed facing the outer end portions of these 24 and 24.
With this configuration, the tip of the mounting pin 26 can be protruded from the pin groove 27 in a state where the mounting pin 26 with the coiled spring 28 is accommodated in the inner support portion 22. The tip of the mounting pin 26 protruding from the pin groove 27 is inserted into a mounting hole 29 formed in the bottom wall 14c of the outer rail 14, and a detachable stopper 30 such as a locking pin is attached to the inside. Regulates more slides than necessary.

The mounting pins 26 with the springs 28 are accommodated in the inner support portion 22 by the number of mounting holes 29 that are perforated with a predetermined mounting interval in the vertical direction of the outer rail 14. It is inserted into each mounting hole 29 of the corresponding outer rail 14.
With this structure, as shown in FIG. 4, the inner rail 16 is attached in an inserted state in the outer rail 14, and is elastically pressed against the bottom wall 14 c of the outer rail 14 by the outward elasticity of each spring 28. The engagement guide 21 is supported by elastically pulling the sheet 2 in the outward sheet tension direction via the guide protrusion 10.

  When the seat 2 receives a load in a direction (front-rear direction) perpendicular to the seat surface, the inner rail 16 has the seat 2 and the guide protrusion 10 as shown in FIG. The pulling force in the inward direction is received via At this time, the inner rail 16 elastically slides inward in the outer rail 14 against the spring 28, so that the force in the pulling direction can be buffered. Further, since the guide walls 23 and 23 and the partition wall 19 which have been bent and deformed at this time are elastically restored, the sheet guide portion 11 is prevented from being damaged.

  Next, the upper inner rail 17 will be described with reference to FIGS. The upper inner rail 17 is detachably connected to the upper portion of the inner rail 16 in the outer rail 14. A sheet stopper 31 extended in an inward angle shape is integrally provided on the upper portion of the upper inner rail 17. The sheet stopper 31 can be in contact with stoppers 32 provided on both sides of the upper portion of the grounding portion 12. Each stopper 32 is attached on both sides of the upper portion of the grounding portion 12 by fastening nuts to bolts penetrated back and forth in portions where the lower end of the sheet 2 and the grounding sheet 12b overlap.

  In the above-described configuration, the sheet shutter 1 is configured such that the upper limit position where the sheet 2 is wound up by the rotation control of the motor 7 in the normal opening / closing mode and the grounding portion 12 rises to the highest position, and the stopper 32 indicated by a solid line in FIG. The ascending operation is set to be stopped at a position spaced apart with a stopper interval of about 20 mm from the bottom. On the other hand, when a malfunction occurs during winding of the sheet 2 or a deposit such as frost described later adheres to the surface of the sheet 2 in a thick layer, the sheet 2 is excessively wound around the sheet drum 5 or the winding diameter. In some cases, the movement increases and the ascending operation exceeds the upper limit position. In such a case, the sheet stopper 31 makes contact with the stopper 32 and restricts the rising of the seat 2 beyond the contact position. Therefore, by restricting the contact rise, the grounding portion 12 into the seat case 4 is restricted. Prevent excessive entrainment.

  The seat shutter 1 according to the embodiment is for maintaining the temporary upper limit position that eliminates the overload of the motor 7 and the trouble of opening and closing operation of the seat 2 at the stop when the restraining of the contact rise of the seat 2 as described above is performed. The control means is provided. The temporary upper limit position holding control means is a rotation detection control means based on pulse detection of the rotation of the motor 7 when the stopper 32 comes into contact with the sheet stopper 31 and stops the detection of the motor load accompanying the contact. It is detected by a load detection control means or the like. Based on the detection signal at this time, the control unit stops the motor 7 and then reverses it so that the sheet 2 is fed out and lowered, and the temporary stop of the sheet 2 that is about 20 mm below the sheet stopper 31 is moved away from the sheet stopper 31. Stop and hold at the upper limit position.

As a result, the seat shutter 1 is held in the temporary upper limit position in preparation for a smooth lowering in the next period, with the seat 2 slightly loosened without fixing the seat 2 to the contact stop position in an unreasonable stop posture. The standby state in preparation for the next descent can be maintained.
Further, the control means for holding the temporary upper limit position is configured so that the lower end of the grounding portion 12 extends downward from the lower portion of the sheet stopper 31 or the seat case 4 within the update range of the temporary upper limit position of about 300 mm. When a state accompanied by an overload occurs in the motor 7 at the time of winding up, the overload state is avoided and the stand-by state of lowering is maintained.

  That is, when the sheet shutter 1 is not opened and closed for a long time at a low temperature, the frost generated on the surface of the sheet 2 adheres to the sheet guide portion 11 while increasing in thickness sequentially from the upper side to the lower side. Similarly, frost is generated and attached. When the sheet 2 is lifted in this state, the sheet drum 5 winds the sheet 2 in a state where the winding diameter is sequentially increased by frost with increased thickness. For this reason, the sheet 2 does not reach the set rotation speed (for example, about 4.5 rotations) of the sheet drum 5 set by the lift stroke amount, and even at a lower rotation speed (for example, about 4 rotations). Causes the ascending operation stopper 32 to contact the sheet stopper 31 beyond the upper limit position.

The rise restriction prevents the grounding portion 12 from being caught in the seat case 4, while the motor 7 is prevented from rotating forward, so that the motor load increases and the rotation is stopped.
Therefore, when such a situation occurs within the update range of the temporary upper limit position, the sheet shutter 1 reverses the motor 7 by the update control of the temporary upper limit position, and the sheet 2 is fed and lowered to lower the lower end of the grounding portion 12. For example, after approximately 20 mm is lowered, the load is released by stopping, and the next descending operation can be smoothly entered.

When the seat shutter 1 is stopped while the sheet 2 is descending at a position below the provisional upper limit position update range, the rotation of the sheet drum 5 is switched from reverse rotation to forward rotation by a load detection control means or the like. 2 is raised to the upper limit position. Further, when stopping while the seat 2 is raised, it is determined that a person or an object has been touched, and the seat 2 is stopped at that position and an alarm is issued.
Further, the seat shutter 1 has a frost removal operation mode, which will be described in detail below, together with the normal opening / closing mode. (Defrosting) The operation mode is switched to an automatic defrosting operation in which frost attached to the sheet 2 is automatically dropped.

  Next, the normal opening / closing mode and the defrosting operation mode and the operation mode of the seat shutter 1 will be described with reference to FIGS. First, as shown in the time chart shown in FIG. 6, the sheet shutter 1 causes the sheet drum 5 to wind up and lift the sheet 2 by the normal rotation of the motor 7 in response to the ascent command (open command) in the normal opening / closing mode. Then, at the upper limit position immediately before the stopper 32 comes into contact with the seat stopper 31 of the upper inner rail 17, the rotation of the seat drum 5 is controlled to stop the rotation, and the grounding section 12 is stopped to be in the descending standby posture. Next, by reverse rotation of the motor 7 in response to the lowering command (closing command), the sheet drum 5 feeds the sheet 2 from the upper limit position and lowers it to the closed state.

  At this time, the seat 2 is lowered while receiving the weight of the grounding portion 12, and the seat drum 5 is automatically stopped when the grounding portion 12 reaches an appropriate grounding position with respect to the floor surface. In addition, the guide protrusions 10 at both ends of the seat 2 are guided by the inner rails 16 of the seat guide portion 11 formed on the left and right support columns 3, and the seat 2 is pulled in the width (lateral) direction to prevent looseness. Slide down, close the doorway and reach the stand-by position for ascending. In the normal opening / closing mode, the seat shutter 1 gradually increases from a low speed to a predetermined moving speed at the initial rising and lowering of the seat 2 by the same motor rotation control means as the conventional one. On the contrary, in the predetermined range of the end of ascent and the end of descent, the seat 2 is gently stopped at the upper limit position or the lower limit position by performing slow stop control in which the motor 7 is gradually rotated at a low speed from the predetermined moving speed and stopped. .

When the defrosting operation mode is set, the mode changeover switch 9e installed on the control panel 9 is switched from the normal open / close mode to automatically switch to the defrosting operation mode as shown in FIGS. Perform frost-free operation. In each figure, the time from when the seat 2 performs the previous opening / closing operation until the defrosting operation mode is turned on is expressed as t1 (minutes), and the setting of the defrosting operation mode standby time is, for example, from 30 minutes. It can be freely selected and set within a time range of about 24 hours at intervals of one hour.
In addition, the number of times that the up and down movement is repeated in the frost removal operation mode of 1 cycle is represented by n, and this setting range can be set by freely selecting the number of times about 1 to 10.

  That is, the defrosting operation mode is changed from the manual or automatic mode of the normal open / close mode shown in FIGS. 6 and 7A to the defrosting operation mode standby state shown in FIG. 7B. Here, the buzzer 9c for notifying the defrosting operation mode is turned ON, and the first defrosting operation in the defrosting operation mode after the elapse of the set time (about 3 seconds) is shown in FIGS. 7 (c) to 7 (f). Thus, the first frost pattern is performed. Next, a series of defrosting operations shown in FIGS. 7C to 7F is set as the second defrosting pattern, and sequentially performed as operations 2 to n−1. Furthermore, a series of defrosting operations shown in FIGS. 8 (k) to 8 (o) is set as the third defrosting pattern, and is performed as the nth operation.

  When the automatic defrosting operation according to each operation pattern in the defrosting operation mode is completed, the buzzer 9c is turned off to return to the normal open / close mode. The same defrosting operation mode is resumed after the set standby time of the defrosting operation mode has elapsed, and a series of automatic defrosting operations are repeated. In addition, the control panel 9 of the seat shutter 1 can be set from the personal computer connected to the control panel 9 in addition to the setting of the normal opening / closing mode, the defrosting operation mode, and the defrosting operation mode by a built-in control unit (not shown). It can also be configured to be able to. Thereby, when the sheet shutter 1 is installed in a refrigeration facility such as a refrigerator that is operated at a low temperature of about −20 ° C., for example, the frost attached to the sheet 2 can be easily and efficiently removed.

  Next, the first frosting pattern in the frosting operation mode will be described with reference to FIG. The seat 2 that starts to rise by the first operation in FIG. 7C from the frost removal operation mode standby state shown in FIG. 7B is 0.5 seconds at a predetermined ascent speed (about 2.5 m / s). After ascending, as shown in FIG. 7D, the ascending operation is stopped at the frost drop height h1 during the raising / lowering stroke of the seat 2. Next, after a stop time of 0.3 seconds, the descending operation shown in FIG. At this time, when the ascending and descending operations are performed at the same speed and for the same time, the descending operation distance becomes longer than the ascending operation distance due to the inertial force, so that the feeding amount of the seat 2 increases, as shown in FIG. Then, the lowering operation is stopped by strongly grounding the grounding portion 12 so as to collide with the floor surface beyond the lower limit position in the normal opening / closing mode.

  In this first frost pattern, the seat 2 in the closed state is raised to the frost height h1 and stopped rapidly, the inertia force in the ascending direction of the seat 2, the tension and relaxation in the vertical direction, and the shaking and bending in the front and rear direction. The first frost removal is performed on the surface of the sheet 2 by the occurrence of the vibration. Then, the seat 2 is again subjected to vibration associated with the rapid lowering from the defrosting height h1, and the second defrosting is performed. Furthermore, the grounding portion 12 is strongly contacted (collised) with the floor surface of the sheet 2, and the third frosting is performed.

In the third frost removal, the weight 12a of the ground contact portion 12 of the seat 2 collides with the floor surface via the ground contact sheet 12b. As a result, the grounding portion 12 and the lower end portion of the sheet 2 are subjected to ground vibration due to strong vibration and large deflection fluctuations, and the frost that adheres firmly to this portion in a thick layer is reliably removed.

  Next, the second defrosting pattern in the defrosting operation mode will be described with reference to FIGS. From the state where the ground contact portion 12 shown in FIG. 7 (f) collides with the floor surface, in FIG. As shown in FIG. 7 (h), the seat 2 rises to the frost drop height h2 during the up / down stroke and stops. Next, after a stop time of 0.3 seconds, the descending operation shown in FIG. As a result, as shown in FIG. 8J, the seat 2 stops suddenly so as to maintain the height h3 without bringing the grounding portion 12 into contact with the floor surface.

  In this second frost pattern, the seat 2 whose ascending operation is suddenly stopped at the frost height h2 set at a position higher than the first time during the up / down stroke is different from the first vibration. Therefore, the frost that has not fallen in the previous frost removal can be removed over a wide range. Further, as shown in FIG. 8 (j), when the seat 2 is suddenly lowered and the grounding portion 12 is suddenly stopped so as to maintain the height h3 without being brought into contact with the floor surface, the seat 2 is attached to the grounding portion 12. Due to the inertia of the descending motion, a fifth vibration is applied that gives an instantaneous tension. As a result, the sheet 2 can peel off the attached frost in the front-rear direction or drop downward to perform frost removal by another action. And a series of defrosting operation | movement by this 2nd defrosting pattern can be performed arbitrary several times (operation | movement 2-n-1 time) also from the personal computer side as needed.

  Next, the third frost removal pattern will be described with reference to FIG. In FIG. 8 (k), the grounding portion 12 shown in FIG. 8 (j) moves the sheet 2 in a non-grounded state having a frost drop height h3 at a predetermined ascent rate (about 2.5 m / s) to 0. After ascending for 8 seconds, as shown in FIG. 8L, the ascending operation is stopped at the frost drop height h4 during the lifting / lowering stroke of the seat 2. In this case, the frost height h4 is set lower than the frost height h2. Next, after a stop time of 0.3 seconds, the descending operation shown in FIG. 8 (m) is started and performed for 0.5 seconds, whereby control (slow stop control) is performed so that the grounding portion 12 is grounded to the floor surface at a low speed. Then, as shown in FIG. 8 (n), the sheet 2 is stopped at the lower limit position, the sheet 2 is closed, and the operation 3 pattern is completed.

  Then, as shown in FIG. 8 (o), the buzzer 9c is turned off to return to the normal open / close mode. Thereafter, the same defrosting operation mode is resumed after an arbitrarily set time, and a series of automatic defrosting operations are performed. In the third frosting pattern, the lowering operation of the sheet 2 from the frosting height h4 is controlled by the slow stop control without rotating the sheet drum 5 at a high speed, so that the sheet 2 is moved slowly at a low speed. It is possible to stop at the lower limit position while lowering.

  Accordingly, the seat 2 in which the inertia when the seat drum 5 is rotated and the inertia force when the grounding portion 12 having a large weight is lowered is suppressed accurately without causing the grounding portion 12 to shift downward from the lower limit position. To do. Further, since the sheet 2 moves downward in a stretched state due to the low-speed feeding of the sheet drum 5 and the weight of the grounding unit 12, the sheet 2 is brought into a closed state in which the slack and wrinkles of the sheet 2 caused by the frosting pattern are stretched, and the grounding unit 12 is maintained at the lower limit position while maintaining airtightness by contact with the floor surface, and can be smoothly shifted to the normal open / close mode.

  Next, a usage mode of the sheet shutter 1 configured as described above will be described. First, since the sheet shutter 1 operated in the normal opening / closing mode at a low temperature has less frost adhesion when the opening / closing operation is frequently performed, the opening / closing of the seat 2 is smoothly performed as in the normal environment at room temperature. Can be done. On the other hand, when the sheet 2 is not opened and closed for a long time without using the defrosting operation mode in a low temperature environment, the frost generated on the surface of the sheet 2 adheres in a thick layer.

  The sheet 2 opened in such a case is wound while the frost is adhered to the forwardly rotating sheet drum 5 to increase the winding diameter, and the stopper 32 exceeding the upper limit position is brought into contact with the sheet stopper 31. The winding of the grounding part 12 is prevented. Then, by detecting the load generated at this time, the sheet drum 5 is temporarily stopped reversely, the stopper 31 is separated from the sheet stopper 32, the sheet is stopped and held at the temporary upper limit position, and the next lowering standby posture is started.

  Further, since the seat shutter 1 has a defrosting operation mode as an automatic defrosting operation function for automatically removing the attached frost, the defrosting operation according to the use mode of the low-temperature storage equipment such as the refrigerator or the freezer room. Based on the mode setting, the defrosting operation can be performed by automatically switching from the normal opening / closing mode to the defrosting operation mode. This can contribute to labor and energy saving and quality control of stored items stored in the low temperature storage facility. Since the defrosting operation includes the various defrosting operation patterns described above, when the seat shutter 1 is installed in a storage facility such as a freezing room operated at the low temperature, the sheet 2 is attached. Can remove frost efficiently and easily.

  That is, in this case, the defrosting operation pattern of the embodiment is that the first defrosting pattern, the second defrosting pattern, and the third defrosting pattern do not fully open the seat 2 and the grounding portion 12 is set. In the vicinity of the upper part of the lower limit position that is not separated from the floor surface higher than necessary, the lifting and lowering operation is repeated for a short time to effectively impart vibrations and frost. For this reason, the outside outflow of the cold air is suppressed, and the conventional sheet shutter 1 can realize frost removal efficiently with a simple and inexpensive structure without greatly changing the structure.

Further, each defrosting operation pattern can be subjected to a series of defrosting operations by combining the defrosting operations characteristic of each pattern in addition to the application of vibrations, so that the operation of each part of the operation can be performed without causing excessive force. The frost can be effectively removed over a wide range with respect to the frost-attached portion.
That is, in the first frost pattern, the sheet 2 is lowered and the ground contact portion 12 is caused to collide with the floor surface to give strong vibrations to the ground contact portion 12 and the lower end portion of the sheet 2, and frost defrosting adhering to this portion is prevented. Make sure.

  In the second frosting pattern, the grounding portion 12 is stopped suddenly so as to maintain the height h3 without being grounded to the floor surface. Since stretching tension and bounce are imparted and vibrated vigorously in the vertical and front-rear directions, defrosting that promotes peeling and dropping of the attached frost can be performed.

  In the third frosting pattern, the seat 2 is moved down from the frosting height h4 and stopped at the lower limit position by the slow stop control in the same manner as in the normal opening / closing mode. Landing). Therefore, even when the seat shutter 1 is installed in a refrigeration facility that is operated at a low temperature of, for example, about −20 ° C., the frost that forms on the sheet 2 and stubbornly adheres can be reliably removed. . This also makes it possible to smoothly raise the seat 2 in the normal opening / closing mode.

Note that the frost removal method according to the frost removal operation mode and the order of the frost removal operation mode of the embodiment and the combination thereof are the same as those in the seat shutter 1 of the illustrated example and the seat shutter 1 shown in FIG. Although it could be done without causing unreasonableness to the equipment, it is necessary to set an appropriate frost removal operation mode and operation pattern for equipment with different frost generation environments and different types of shutter devices. Is desirable.
Further, the frost removal method can be used in the same manner for the sheet shutter 1 of another embodiment having the cored sheet 2 as shown in FIG. 9 in addition to the sheet shutter 1 having the illustrated sheet 2.

  Next, the sheet shutter 1 according to another embodiment will be described with reference to FIGS. In addition, description is abbreviate | omitted about the structure and effect | action similar to the thing of the said embodiment. In the seat shutter 1, the inner rail 16 and the upper inner rail 17 are removed from the outer rail 14 of the seat shutter 1 according to the embodiment. Then, by inserting both ends of a plurality of core members 33 included in the core-attached sheet 2a similar to the conventional ones to the left and right outer rails 14, the core member 33 can be guided to slide up and down to open and close the seat 2a. it can.

  As a result, the sheet shutter 1 shown in FIG. 9 assumes a lowering standby posture at the upper limit position where the sheet 2 a is wound around the sheet drum 5. When the seat drum 5 is fed out and rotated, the lowermost core material 33a and the next-most core material 33... Are sequentially lowered into the rail groove 14b to be fully closed. Further, each core material 33 is lifted and slid in the outer rail 14 by the winding rotation of the seat drum 5 to wind and raise the sheet 2a. The core members 33 and 33a in the illustrated example are round pipes like the conventional ones, and are attached and supported by being inserted into a core member attachment bag 34 formed at the core member attachment position of the seat 2. A roller shaft 37 that rotatably supports the roller 36 at the shaft end is detachably inserted and attached to both ends of the core members 33 and 33a.

  The roller 36 is made of a synthetic resin material having cold resistance and wear resistance, and the outer periphery of the roller has a curved surface that swells to a middle height. Further, a concave groove-shaped ring groove 36a is formed in the central portion of the roller 36, and a ring 38 having elasticity is detachably inserted into the ring groove 36a, and the ring outer peripheral surface projects from the curved surface. The roller 36 is detachably attached by a fixture 39 provided at the end of the roller shaft 37 in a state where the roller 36 is rotatably inserted into the roller shaft 37. Thereby, since the roller 36 contacts and rolls the ring 38 without directly contacting the outer periphery of the roller with the outer rail 14, the outer periphery of the roller can be protected from frost attached to the rail surface. Further, since the ring 38 elastically contacts the attached frost, there are features such that the opening / closing operation of the seat 2 can be made smooth and the replacement when the ring is worn can be easily performed.

1 Sheet shutter (shutter device)
2 Sheet (Shutter)
2a Seat with core material 3 Post 4 Seat case (device frame)
5 Seat drum (storage and feeding device)
7 Motor 9 Control panel 11 Seat guide 14 Outer rail 31 Sheet stopper 32 Stopper

Claims (5)

  A seat case (4) that supports a seat drum (5) that winds and feeds the sheet (2) by forward and reverse rotation driving of a motor (7), and seats ( 2) is provided with a seat guide portion (11) for guiding the lifting and lowering operation, and the grounding portion (12) is moved to the lowest position from the fully closed lower limit position where the grounding portion (12) at the lower end of the seat (2) is grounded to the floor surface. In the defrosting method of the seat shutter that removes the frost attached to the seat (2) while opening and closing the upper limit position between the upper limit position and the fully open state, the seat (2) is lifted and lowered. From the normal opening / closing mode in which the seat is opened and closed, the grounding portion (12) of the fully closed seat (2) is stopped in the middle of ascent, and the seat (2) is lowered from the stopping position in the middle of ascent to lower the grounding portion (12 ) On the floor By switching to the defrosting operation mode in which the basic defrosting operation is performed to ground or stop at a position close to the floor surface, the seat (2) is given vibrations in the vertical and front-rear directions accompanying the basic defrosting operation. 2) A defrosting method for a sheet shutter that removes the frost adhered to 2).   During the operation in the defrosting operation mode, the defrosting operation for applying strong vibration to the seat (2) by lowering the seat (2) from the stopping position during the ascent and causing the ground contact portion (12) to collide with the floor surface. The sheet shutter defrosting method according to claim 1, wherein the defrosting is performed.   For the stop position in the middle of raising the basic defrosting operation in the defrosting operation mode, another stop position having a height different from the stop position is set, and the grounding portion (12) is moved up and down between both stop positions; The defrosting method for a seat shutter according to claim 1 or 2, wherein defrosting is performed by applying vibration to the sheet (2) by suddenly stopping.   When returning from the defrosting operation mode to the normal opening / closing mode, the descending operation of the seat (2) of the defrosting operation immediately before the return is performed by the slow stop operation which is the same slow speed operation as the normal opening / closing mode, and the grounding portion (12). The seat shutter defrosting method according to claim 1, 2 or 3, wherein the shutter is stopped at the lower limit position.   In the operation in the normal opening / closing mode, the sheet (2) is moved beyond the upper limit stop position in the state where the frost is not attached to the sheet (2) by the winding of the sheet drum (5). When 2) is rolled up, the stopper (32) provided on the sheet (2) side is brought into contact with the sheet stopper (31) provided on the sheet case (4) or the sheet guide part (11) side, and the sheet drum By stopping the rotation of (5) and reversing a certain amount, the stopper (32) is moved away from the sheet stopper (31), the sheet (2) is stopped at the temporary upper limit stop position, and the next lowering operation is started. The sheet shutter defrosting method according to claim 1, 2, 3, or 4, wherein the standby state is maintained.

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