KR101672756B1

KR101672756B1 - Airtight door apparatus for warehouse

Info

Publication number: KR101672756B1
Application number: KR1020160031640A
Authority: KR
Inventors: 오재석
Original assignee: 유한회사 돌로지스틱스캄파니; 김남국; 오재석
Priority date: 2016-03-16
Filing date: 2016-03-16
Publication date: 2016-11-04

Abstract

An object of the present invention is to provide a hermetically sealed door device for a warehouse, which can easily slide the door sideways, move easily in the doorway direction, and easily separate the door from the sealing member .
To this end, the present invention comprises a door 12 provided to open and close a door 5 of a warehouse, a pit P formed at the bottom of the door 5, A lower supporting means provided at a lower portion of the door 12 and a plurality of first pushers 60 for pressing the door 12 toward the wall body 1, And a sealing member (630) for sealing the four edges of the doorway (5) of the wall body (1), wherein the door driving means is horizontally provided on the upper part of the door A pinion 600 assembled to an upper portion of the rack 610 and a driving motor 620 for driving the rack 610. The rack 610 is connected to the rack 610, The lower support means includes a support member 670 extending downward from both sides of the lower end of the door 12 and a support member 670 coupled between the support member 670 And a rotating roller 690 assembled to the shaft 680 and moving along the pit rail 660 so that the shaft 680 is assembled to the rotating roller 690 So that it can move a certain distance along the axial direction.

Description

{AIRTIGHT DOOR APPARATUS FOR WAREHOUSE}

The present invention relates to a closed door device for a warehouse, and more particularly, to a door device for a warehouse, which comprises a pit at the bottom of an entrance of a warehouse and a door driving means at an upper portion of the wall, In the door device that moves along the door, a rack and a pinion gear are provided at the upper portion of the door to allow the door to move laterally and also to move in and out of the doorway so that the door can be easily brought into close contact with the wall. The door being slidable toward the wall so as to improve the hermeticity and to allow the door to be slid while being completely separated from the sealing member when the door is opened.

The warehouse facility for storing various articles is provided with a door device for opening and closing the door. Fig. 1 shows an example of such a conventional door device.

1, the conventional door apparatus includes an entrance 5 provided in the wall 1, a door 12 sliding laterally to open and close the entrance 5, And a sliding support means 20 provided at an upper portion of the door 1 for supporting the upper portion of the door 12.

A pit P is formed laterally on the bottom surface of the entrance 5 and a guide rail is provided on the bottom surface of the pit P to slide the slider provided at the lower end of the door 12. [ Respectively.

The door device of the above structure is configured such that the lower portion of the door 12 moves along a guide rail provided on the bottom surface of the pit P and the upper portion of the door 12 is supported by the sliding support means 20 It is possible to smoothly slide the door 12 in comparison with the door apparatus in which the pits P are not formed.

That is, the door 12 can be smoothly opened and closed as compared with a hanger method in which only the upper portion of the door 12 is suspended by the sliding support means 20. [ Accordingly, it is suitable for a large-sized frozen warehouse or a fumigation warehouse door that performs fumigation disinfection of fruit.

However, in the conventional door device shown in FIG. 1, when the door 12 is pushed open to the side, there is a problem that the pits P formed on the bottom surface of the entrance 5 are directly exposed.

Accordingly, in order to allow a work vehicle such as a forklift to go in and out, a separate pit cover 190 should be placed on the top of the pit P so as to prevent the wheel from falling into the pit P and be removed.

In addition, there is an inconvenience that the pit lid 190 must be removed again to close the door 12 after the necessary work is completed.

In order to solve the problems of the prior art described above, the present applicant has applied for a patent for a door device having a pit cover and has been registered as a patent No. 10-1569315.

As shown in FIGS. 2 to 5, the door device having a pit cover includes a door 12 provided to open and close a doorway 5 of a warehouse facility, And a lower sliding portion which is provided in the lower portion of the door 12 and is accommodated in the pit P so as to slide the door 12, The door device according to the present invention comprises a support means 100 and a sliding support means 20 provided on an upper portion of the door 12 to allow the door 12 to slide, 12 provided on the lower side of the pit P so as to slide along with the door 12 and a lower guide rail 102 provided on the bottom surface of the pit P, A plurality of pit cover sliders 110 sliding along the lower guide rail 102, And a plurality of connecting members 120 extending downward from the bottom surface of the pit cover 190 and connected to the pit cover slider 110. When the door 12 is opened sideways, And the lid 190 automatically covers the pit P of the entrance 5.

However, when the door device was installed in a fumigation disinfection warehouse, the following problems were found.

First, there is a problem that the sliding support means 20 (see FIG. 4) provided on the upper portion of the door 12 can not withstand the weight of the door and is easily damaged.

That is, the weight of the door 12 used for the large-sized fumigation disinfection warehouse is about 3 to 5 tons. However, the weight of the sliding supporting means 20 shown in FIG. 4 is difficult to bear.

Further, in the conventional door apparatus, as shown in Fig. 4, the upper slider 24 and the lower slider 104 of the door can slide only in the lateral direction (lateral direction).

That is, the sliding support means 20 provided on the upper portion of the door 5 is fixed, and the horizontal guide cylinder 42 provided at the lower portion of the upper slider 24 and the lower guide cylinder 42 provided at the upper portion of the lower slider 104 The horizontal guide cylinder 172 pushes the door 12 toward the wall 1 side.

Accordingly, there is a problem that the upper portion of the door 12 connected to the sliding support means 20 can not overcome the weight of the door and is damaged.

In addition, since the conventional door device pushes the door 12 against the wall while compressing the spring provided on the horizontal guide cylinder 42 and the lower slider 104, the pressing force of the first pusher 60 is increased do.

4 releases the pressing force of the first pusher 60 that seals the door 24 to the entrance 5 side, the horizontal guide cylinder 42 and the lower horizontal guide cylinder The door 12 is separated from the entrance / exit 5 side by the elastic force of the spring provided on the door /

The doors 12 reaching 3 to 5 tons are not smoothly separated from the sealing member 30 only by the elastic force of the spring provided to the horizontal guide cylinder 42 and the lower horizontal guide cylinder 172. [

There is a problem that the sealing member 30 made of rubber is easily damaged by the door when the door 12 is slid to the side.

The elastic force of the spring provided on the lower horizontal guide cylinder 172 is sharply lowered due to the weight of the door 12 and the door 12 is slid as shown in FIG. There is a problem that the sealing member is broken.

In addition, the conventional door apparatus has a problem that when it is used in a fumigation disinfection facility in which a certain pressure is to be maintained inside a warehouse, the airtightness is lowered.

[Prior Art Literature]

[Patent Literature]

(Patent Document 1) Korean Patent No. 10-1569313

(Patent Document 2) Korean Patent No. 10-1569314

(Patent Document 3) Korean Patent No. 10-1569315

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to allow a door to be easily moved sideways and to easily move a door in an entrance / exit direction.

It is another object of the present invention to improve the hermeticity of the door with the sealing member provided on the wall by easily moving the door in the entrance and exit direction.

It is a further object of the present invention to allow the door to be completely spaced from the wall before sliding the door sideways.

It is still another object of the present invention to prevent breakage of the door driving device and to reduce the maintenance cost.

Still another object of the present invention is to improve the structure of the sealing member to improve airtightness.

According to an aspect of the present invention, there is provided a closed door device comprising: a door provided to open and close an entrance of a warehouse facility; a pit formed along the moving direction of the door on the floor of the doorway; A lower support means provided at a lower portion of the door to allow the door to move inside the pit, and a plurality of lower support means provided at the front side of the door to press the door toward the wall side And a sealing member for sealing the four edges of the doorway of the wall body, wherein the door driving means includes a rack horizontally provided at an upper end portion of the door, A pinion to be assembled, and a drive motor for driving the rack, wherein the door can move laterally The lower support means includes a support member extending downward from both sides of the lower end of the door and a shaft extending downward from both sides of the shaft, And a rotating roller mounted on the shaft and moving along the pit rail so that the shaft can be moved a certain distance along the axial direction in a state where the shaft is assembled to the rotating roller.

The width of the rack is larger than the width of the pinion, and the rack is moved by a predetermined distance in the axial direction of the pinion together with the door by a pressing force of the first pusher in a state where the rack is engaged with the pinion.

Further, the present invention is further characterized in that a plurality of second pushers are provided on the wall-side frame for separating the door from the sealing member by pushing the door outward.

In addition, a frame vertically provided on both sides of the pit is further provided with a guide member for guiding the lower part when sliding the door.

In addition, the guide member includes a stretching cylinder and a rotating roller horizontally provided at the tip of the stretching and shrinking cylinder.

The sealing member may include a base having a circular groove on one side and a seal formed of a rubber material having a circular cross section.

Further, the seal is characterized by being fitted into the groove of the base as a unitary rectangular loop shape.

The base may have two grooves formed in the base, and two seals may be respectively fitted into the grooves.

Further, a plate-shaped pit cover that horizontally moves together with the door is further provided on a lower side of the door so that when the door is opened sideways, the pit cover automatically covers the pit of the doorway .

Further, the pit is formed to include a door opening section, a door closing section, and a pit lid receiving section.

According to the closed door device according to the present invention, it is possible to easily move the door with a heavy weight to the side, and to easily move the door even in the vertical direction which is the entrance and exit direction.

In addition, since the door can be easily moved in the door entrance / exit direction so as to be brought into close contact with the sealing member, it is possible to improve the airtightness of the door apparatus.

Further, since the door can be easily separated from the wall before sliding the door to the side, it is possible to prevent breakage of the sealing member when sliding the door.

In addition, since the door is slid without slanting while being kept in a vertical state, breakage of the door driving device can be prevented, and the maintenance cost can be reduced.

Further, by improving the structure of the sealing member, the sealing performance of the door apparatus can be improved.

Further, by providing the pit lid device on the lower side of the door, the pit lid can automatically cover the pit when the door is opened.

1 is a perspective view showing an example of a door device according to the related art.
2 is a perspective view of a door device having a pit lid according to the prior art;
3 is a plan view and front view of a door device with a pit lid according to the prior art;
4 is a sectional view taken along the line AA in Fig.
5 is a sectional view taken along line BB of Fig.
6 is a view showing a state in which a door is slanted in a door device according to the related art.
7 is a plan view and front view of a closed door device according to the present invention.
Fig. 8 is a side cross-sectional view of a closed door device according to the present invention, wherein Fig. 8A shows a state in which the door is in close contact with the sealing member, and Fig. 8B shows a state in which the door is separated from the sealing member.
9 is a schematic perspective view illustrating a driving unit of a closed door apparatus according to the present invention.
10 is a perspective view showing a lower part of a closed door device according to the present invention.
11 is a perspective view of a guide member according to the present invention.
12 is a perspective view showing a sealing member of the closed door device according to the present invention.
13 is a cross-sectional view taken along line DD of Fig.
14 is a view showing another embodiment of the sealing member according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a closed door device according to the present invention will be described in detail with reference to FIGS. 7 to 14. FIG.

As shown in FIGS. 7, 8A and 8B, the closed door device of the warehouse facility according to the present invention includes a door 12 provided to open and close a doorway 5 of a warehouse facility, A door P is provided on the floor of the door 5 so as to move along the moving direction of the door 5 and a door driving means provided on the door 12 to move the door 12 to the side, A lower support means provided at a lower portion of the door 12 to allow the door 12 to move within the pit P and a lower support means provided at the front of the door 12 to press the door 12 toward the wall 1 A first pusher 60 and a sealing member 630 for sealing the four edges of the entrance 5 of the wall 1.

The door 12 has a size larger than the entrance 5 of the warehouse and when the door 12 is moved laterally to close the door 5, the four edges of the door 12 are positioned at the edge of the door 5 And overlaps with the frame F provided.

7 and 8, the door 12 is shown as being installed outside the wall 1, but the door 12 may be installed inside the wall 1.

The pit P is recessed along the moving direction of the door 12 on the bottom surface of the entrance 5 to accommodate the lower end of the door 12 and the lower end of the frame F. [

The first pusher 60 is provided on four sides of the periphery of the frame F so as to push the door 12 toward the entrance 5 and press it.

In FIG. 7, the first pusher 60 is shown at the top, four at the bottom, and two at the two sides. However, the number of the first pushers 60 can be increased or decreased according to the size of the door.

The first pusher 60 is preferably a solenoid type actuator 62 that is actuated according to an applied control signal and pushes the front portion of the door 12 toward the entrance 5 to press the first pusher 60.

However, the present invention is not limited thereto, and the first pusher 60 may be constituted by a hydraulic cylinder or a pneumatic cylinder.

The plurality of actuators 62 are a kind of solenoid device having a push rod 62a which is actuated in response to an applied control signal to move the front portion of the door 12 to the entrance 5 ) Side.

The door 12 is moved toward the entrance 5 so that the four edges of the door 12 can be brought into close contact with the sealing member 30 provided on the frame F. [

As a result, the space between the door 12 and the wall 1 is completely sealed to improve the internal sealing performance of the wall 1.

Next, the features of the closed door device according to the present invention will be described.

9, the door driving unit according to the present invention includes a rack 610 horizontally provided at an upper portion of the door 12, a pinion 610 mounted on the upper portion of the rack 610, A pinion 600 and a driving motor 620 for driving the rack 610.

The width D1 of the rack 610 is wider than the width d1 of the pinion 600. This is for moving the rack 610 in the axial direction of the pinion 600 together with the door 12 by the urging force of the first pusher 60 while the rack 610 is engaged with the pinion 600. [

The door 12 can be moved laterally along the axial direction of the pinion 600 by a predetermined distance in the direction of the entrance 5 of the wall body 1. [

That is, when the door 12 is pushed by the first pusher 60 while the driving motor 620 is stopped, the rack 610 provided at the upper end of the door 12 is moved in the axial direction of the pinion 600 So that the door 12 can be brought into close contact with the sealing member 630, as shown in Fig. 8A.

Accordingly, the hermeticity of the door can be improved as compared with the conventional system. Further, as compared with the conventional system shown in Fig. 4, since the door driving mechanism is simplified, breakage of the door driving apparatus can also be prevented.

In the conventional door driving system shown in Fig. 4, the door 12 is moved sideways by the slider 24.

Accordingly, opening and closing of the door 12 of the fumigation disinfection facility of about 3 to 5 tons is not smooth and the driving parts are damaged.

Particularly, as shown in Fig. 6, there is a problem that the door driving device and the sealing member are broken by sliding the lower portion of the door 12 in a tilted state without being completely separated from the sealing member 30. [

However, according to the present invention, since the door 12 is driven by the rack 610 and the pinion 600 provided at the upper end of the door 12, it is possible to stably move the door of a high weight, Can be prevented.

10, the lower supporting means includes a support member 670 extending downward from both sides of the lower end of the door 12, and a shaft (not shown) coupled between the support member 670 And a rotating roller 690 assembled with the shaft 680 and moving along the pit rail 660.

With the above structure, the rotating roller 690 can be moved on the pit rail 600, and the shaft 680 can be rotated in the state of being coupled with the rotating roller 690, as shown in Figs. 8A and 8B (The entrance direction) of the shaft 680 at a certain distance.

To this end, the rotating roller 690 and the shaft 680 are assembled by loose fitting.

8A and 8B, a second pusher 640 for pushing the door 12 outwardly and separating it from the sealing member 630 is provided in the frame 1 F side of the wall 1, Respectively.

With the above-described structure, the door 12 can be kept completely vertical from the sealing member 630 before sliding the door 12 to the side.

Thus, breakage of the door driving device and the sealing member can be prevented.

The number of the second pushers 640 may be increased or decreased according to the height of the door 12.

According to the conventional door driving method shown in FIG. 4, the horizontal guide cylinder 42 provided at the upper portion of the door 12 and the lower horizontal guide cylinder 172 provided at the lower portion of the door The door 12 is separated from the sealing member 30 only by the elastic force.

Accordingly, there is a problem that the door 12 is not easily separated from the sealing member in the case of a heavy-weight door of about 3 to 5 tons.

In particular, there is a problem that the resilience of the restoring spring provided in the lower horizontal guide cylinder 172 is lowered due to the self weight of the door itself.

Accordingly, as shown in FIG. 6, there is a problem that the door 12 is slid in a slanted state, thereby damaging the door driving device and the sealing member.

According to the present invention, however, the door 12 can be easily pushed outwardly by the plurality of second pushers 640 provided on the frame 1 F side of the wall 1 before sliding the door 12 to the side .

Accordingly, when the door is slid sideways, the door 12 can be completely separated from the sealing member 630 and slid while maintaining the vertical state.

8A and 8B, a guide member 650 for guiding the lower portion of the door 12 is attached to a frame F vertically provided on both sides of the pit P, .

11, the guide member 650 includes an extensible cylinder 650a and a rotating roller 650b horizontally provided at the tip of the extensible cylinder 650a.

The guide member 650 is provided on both sides of the pit P so that the door 12 guides the inside of the pit P smoothly. In addition, it also serves to push the lower end of the door 12 outwardly before sliding the door 12.

Accordingly, the door 12 having a high weight can be smoothly moved without being inclined in the pit P.

12 and 13, the sealing member 630 according to the present invention includes a base 630b having an arc-shaped groove 630c formed on one side thereof, a seal 630b formed of a rubber material having a circular cross- (630a).

The seal 630a is fitted into the groove 630c of the base 630b as a unitary rectangular loop shape and assembled.

14, two grooves 630c may be formed in the base 630c, and two seals 630a may be respectively inserted into the grooves 630c.

With the above-described sealing structure, the hermeticity of the door 12 can be further improved.

In particular, the pressure inside the warehouse which performs fumigation disinfection can be maintained constantly above a certain level.

In addition, the present invention may further include a plate-shaped pit cover which horizontally moves together with the door 12 on one side of the lower portion of the door 12.

With the above-described structure, when the door 12 is opened sideways, the pit cover can automatically cover the pit P of the entrance / exit 5.

The pit P is formed to include the door opening section L1, the door closing section L2, and the pit lid receiving section L3.

Accordingly, when the door 12 is positioned in the door opening section L1, the door 5 is opened. When the door 12 is positioned in the door closing section L2, the door 5 can be closed.

8A and 8B illustrate that the lower portion of the frame F is accommodated in the pit P, but this is for illustrative purposes of a fumigation disinfection facility, and in the case of having a pit lid, The frame F may be provided on the ground.

Hereinafter, the operation and effect of the closed door device according to the present invention will be described.

First, when the door 12 is closed, as shown in Fig. 7, the pinion 600 provided on the upper part of the frame F is driven counterclockwise.

Then, the door 12 integrated with the rack 610 engaged with the rack 610 moves rightward toward the entrance 5 side.

The rotary roller 690 provided at the lower end of the door 12 moves sideways on the pit rail 660 provided on the pit P. [

Accordingly, even when the door is a heavy-weight door, it can be stably slid.

After the door 12 is moved to the door closing section L2 (see Fig. 2), the driving motor 620 driving the pinion 600 is stopped, Thereby actuating a plurality of first pushers 60.

Then, as shown in Fig. 8A, the actuators 62 of the first pusher 60 are actuated to push the door 12 toward the wall 1 side.

9, the rack 610 integrally formed on the upper portion of the door 12 is moved in the axial direction (entrance / exit direction) of the pinion 600. As shown in FIG.

10, the rotating roller 690 provided at the lower end of the door 12 and the shaft 680 loosely fitted are also slid toward the wall body 1 side.

Accordingly, the door 12 of a relatively high load is moved toward the wall 1 side without fail, and the four edges of the door 12 are completely brought into close contact with the sealing member 630, thereby improving the hermeticity of the door.

When a necessary operation such as fumigation disinfection is completed and the door 12 is opened, as shown in FIG. 8B, the first pusher 60, which has previously pressed the door 12, is returned to the original state.

Subsequently, the second pusher 640 provided on the frame 1 F side of the wall 1 is operated to push the door 12 outward.

The rack 610 provided at the upper portion of the door 12 moves along the axial direction of the pinion 600 and the shaft 680 provided at the lower portion of the door 12 is assembled And is slid toward the outside on the rotating roller 690.

As a result, the door 12 and the sealing member 630 are completely separated from each other and the door 12 is maintained in a vertical position.

When the driving motor 620 is rotated clockwise in this state, the door 12 integrated with the assembled rack 610 moves in the leftward direction.

When the door 12 is positioned in the door opening section L1 (see FIG. 2), the door 5 is completely opened, and the pit cover 190 automatically covers the pit of the door 5.

Accordingly, a work vehicle such as a forklift can quickly enter the inside of the warehouse through the entrance 5 to perform necessary work.

Door which is installed in warehouse facility performing fumigation disinfection of fruit reaches the weight of 3-5 tons and it is not easy to open and close.

Therefore, according to the conventional door driving method (see FIG. 4), there is a problem that the door driving device provided at the upper part of the door is easily damaged due to the high weight of the door.

In the conventional door device shown in Fig. 4, the door and the sealing member are separated from each other only by the restoring force of the spring provided inside the guide cylinder.

Accordingly, in the case of a door having a high weight, the door is not easily separated from the sealing member, and the elastic force of the spring is deteriorated with time, and this problem is further exacerbated.

Further, due to the self weight of the door, the lower portion of the door may not be smoothly separated from the sealing member, and the door may slide in an inclined state.

However, according to the present invention, a rack is installed on the door and the door is driven by a pinion, thereby greatly simplifying the door driving method.

Particularly, since the rack provided at the upper portion of the door moves along the axial direction of the pinion, and the shaft provided at the lower portion of the door also slides in the same direction while riding on the rotary roller, can do.

In addition, since the second pusher provided on the wall side pushes the door toward the outside before sliding the door, the door and the sealing member can be easily separated from each other.

Further, since the guide member is provided on both sides of the pit, the door moving along the pit can be stably slid.

In other words, according to the present invention, even a door of a high weight can be easily slid to slide to the side, can be easily brought close to the wall side, and the door can be easily pushed outward.

Further, since the four-sided loop-shaped sealing member formed of rubber is fitted in the base of the metal material, the sealing property can be improved and the damage of the sealing member can be minimized.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the invention is not limited to the disclosed exemplary embodiments. As appropriate.

For example, the present invention can be applied not only to a storage facility requiring airtightness such as a fumigation disposal warehouse, a freezing warehouse, but also to other warehouse facilities having a pit and a sliding type door.

1: Wall 3: Outside space
5: Doorway 7: Interior space
9: floor 10: door device
12: Door 20: Sliding support means
22: Guide rail, 24: Slider,
26: Linear motor (30): Sealing member
40: first guide unit 42: horizontal guide cylinder
42a: Cylinder body 42b: Cylinder rod
60: First pusher 62: Actuator
62a: Push rod 100: Lower sliding supporting means
102: lower guide rail 104: lower slider
110: foot cover slider 120: connecting member
130: reinforcing member 140: supporting member
150: a pit lid accommodating portion 170: a second guide unit
172: lower horizontal guide cylinder 172a: cylinder body
172b: cylinder rod 190:
600: Pinion 610: Rack:
620: drive motor 630: sealing member
630b: Base 640: Second pusher
650: guide member 650a: cylinder
650b: guide roller 660: pit rail
670: Support member 680: Shaft
690: rotating roller F: frame (Frame)
L1: door opening section L2: door closing section
L3: Pit cover receiving section P: Pit

Claims

A pit P formed along the moving direction of the door 5 on the floor of the entrance 5 and a door 12 provided on the door 12 so as to open and close the entrance 5 of the warehouse facility, A door driving means provided at an upper portion of the door 12 to move the door 12 to the side and lower supporting means provided at a lower portion of the door 12 to allow the door 12 to move within the pit P; A plurality of first pushers 60 provided at the front of the door 12 to press the door 12 toward the wall 1 and a sealing member 60 for sealing the four edges of the entrance 5 of the wall 1, (630), the door device comprising:
Wherein the door driving means comprises:
A rack 610 provided horizontally at an upper portion of the door 12,
A pinion 600 assembled to the upper portion of the rack 610,
And a driving motor 620 for driving the rack 610,
The door 12 can be moved sideways and moved along the axial direction of the pinion 600 by a predetermined distance in the entrance and exit direction of the entrance 5 of the wall body 1,
Wherein the lower support means comprises:
A supporting member 670 extending downward from both sides of the lower end of the door 12,
A shaft 680 coupled between the support members 670,
And a rotating roller 690 assembled with the shaft 680 and moving along the pit rail 660,
The shaft 680 can be moved a certain distance along the axial direction in a state of being assembled with the rotary roller 690,
The width D1 of the rack 610 is wider than the width d1 of the pinion 600 so that the pressing force of the first pusher 60 in the state where the rack 610 is engaged with the pinion 600 Is moved by a predetermined distance in the axial direction of the pinion (600) together with the door (12).

delete

The method according to claim 1,
Further comprising a second pusher (640) provided in the frame (F) on the side of the wall (1) for separating the door (12) from the sealing member (630) Door device.

The method according to claim 1,
Wherein the frame (F) provided vertically on both sides of the pit (P) is further provided with a guide member (650) for guiding the lower portion when sliding the door (12).

5. The method of claim 4,
Wherein the guide member 650 includes a stretching cylinder 650a and a rotating roller 650b horizontally provided at a distal end of the stretching cylinder 650a.

The method according to claim 1,
The sealing member (630)
A base 630b having an arc-shaped groove 630c formed on one side thereof, and a seal 630a formed of a rubber material having a circular cross-section.

The method according to claim 6,
Wherein the seal (630a) is assembled by being fitted into a groove (630c) of the base (630b) in the form of a unitary rectangular loop.

8. The method of claim 7,
Wherein two grooves 630c are formed in the base 630b and two seals 630a are assembled into the grooves 630c.

The method according to claim 1,
The door 12 further includes a plate-shaped pit cover which horizontally moves together with the door 12 so that when the door 12 is opened sideways, (P) is automatically covered when the door is closed.

10. The method of claim 9,
The pits (P)
The door closing section (L1), the door closing section (L2), and the pit lid receiving section (L3).