CN113970903A

CN113970903A - Intelligent hydraulic floor door with warning function

Info

Publication number: CN113970903A
Application number: CN202111248587.4A
Authority: CN
Inventors: 何海山; 魏乃信
Original assignee: Jiangsu Zero Water Intelligent Technology Co ltd
Current assignee: Jiangsu Zero Water Intelligent Technology Co ltd
Priority date: 2021-10-26
Filing date: 2021-10-26
Publication date: 2022-01-25

Abstract

The invention discloses an intelligent hydraulic floor door with a warning function, and relates to the technical field of sewage treatment. According to the invention, through the mutually matched arrangement of the components, the effects of overhauling and uninterrupted ventilation on the underground space can be realized, meanwhile, other objects with smaller air tightness, such as rainwater, snow water and hailstones in severe weather, can be shielded, the objects are prevented from falling into the underground space to cause difficult cleaning, the change of weather can be detected through the sensor, the airtight door can be intelligently closed and opened and closed, the automatic work of equipment is realized, and the convenience is improved.

Description

Intelligent hydraulic floor door with warning function

Technical Field

The invention relates to the technical field of sewage treatment, in particular to an intelligent hydraulic floor door with a warning function.

Background

Along with the growth of economy and population, the pollution to the nature is more and more emphasized by human beings, the purpose of the device is mainly to ensure that domestic sewage and similar industrial organic wastewater after being treated by the device meet the discharge standard required by users, the device is mainly used for treating domestic sewage in residential districts (including villa districts), high-grade hotels, hospitals, comprehensive office buildings and various public buildings, and the intelligent hydraulic floor door is required in the treatment device to shield the top of the device.

Intelligent hydraulic pressure floor door on market exists and can not accomplish to the underground space and be had no discontinuous ventilation effect, leads to inside gas in time to discharge, when equipment received the damage, inconvenient inside shortcoming of maintaining and repairing.

Disclosure of Invention

The invention aims to provide an intelligent hydraulic floor door with a warning function, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: an intelligent hydraulic floor door with a warning function comprises a door body and a limiting assembly, wherein the middle part of the door body is provided with a detection assembly, a metal grid is arranged below the detection component, a cleaning component is arranged at the bottom of the metal grid, a sliding groove is arranged on the surface of the door body, an airtight assembly is arranged in the sliding groove and comprises a stroke cylinder, an airtight door, a sealing strip, a damping rotating shaft, an expansion door, a warning band and a strobe light, the output end of the stroke cylinder is connected with the airtight door, the right side of the airtight door is provided with the sealing strip, the outer end of the airtight door is connected with the damping rotating shaft, the outside of the damping rotating shaft is provided with the expanding door, the warning belt is arranged on the periphery of the outside of the expanding door, the strobe lamp is arranged on the surface of the expansion door, and the limiting component is mounted on the upper surfaces of the airtight door and the expansion door.

Preferably, the detection assembly comprises a detection box, a main control board, a temperature and humidity sensor, a protection block and a folding air bag, the main control board is arranged in the detection box, the temperature and humidity sensor is arranged outside the detection box, the protection block is arranged at the top of the detection box, and the folding air bag is arranged in the protection block.

Preferably, the temperature and humidity sensors are electrically connected with the main control board, the temperature and humidity sensors are provided with two groups which are respectively arranged on two sides of the detection box, and the temperature and humidity sensors and the detection box are on the same horizontal plane.

Preferably, the clearance subassembly includes clearance frame, slide rail, installing support, electric telescopic handle, cleaning roller, soft brush and receiver, just clearance frame both sides are all installed the slide rail, the slide rail outside is connected with the installing support, just installing support internally mounted have electric telescopic handle, the electric telescopic handle output is connected with the cleaning roller, just the cleaning roller surface is provided with soft brush, the receiver install in under the clearance frame.

Preferably, the cleaning roller is connected with the slide rail in a sliding manner through the electric telescopic rod, the cleaning roller is connected with the slide rail in a rotating manner, and the length of the cleaning roller is matched with the width of the slide rail.

Preferably, the storage box is connected with the cleaning frame in a sliding clamping mode, and the cleaning frame is of a rectangular hollow structure.

Preferably, the expansion door and the airtight door form a rotating structure through the damping rotating shaft, the maximum rotating angle of the expansion door is 90 degrees, and the shape and the size of the expansion door are consistent with those of the airtight door.

Preferably, the stroboscopic lamps are symmetrically provided with two groups about the central position of the expansion door, and the stroboscopic lamps are in a long strip shape.

Preferably, the limiting assembly comprises a rotating shaft, a support rod, a top block, a mounting frame, a rotating shaft, a warning board and a clamping groove, the support rod is arranged outside the rotating shaft, the outer end of the support rod is connected with the top block, the mounting frame is installed on the upper surface of the airtight door, the mounting frame passes through the rotating shaft and the warning board, and the clamping groove is formed in the surface of the mounting frame.

Preferably, the expansion door and the placement frame form a fixed structure through the support rod, the placement frame is fixedly connected with the expansion door, and two groups of placement frames are symmetrically arranged at the center of the expansion door.

The invention provides an intelligent hydraulic floor door with a warning function, which has the following beneficial effects: according to the intelligent hydraulic floor door with the warning function, due to the fact that the components are arranged in a matched mode, the effects of overhauling and uninterrupted ventilation of an underground space can be achieved, meanwhile, other objects with small air tightness, such as rainwater, snow water and hailstones in severe weather can be shielded, the objects are prevented from falling into the underground space and being difficult to clean, changes of weather can be detected through the sensor, the airtight door can be intelligently closed and opened and closed, automatic work of equipment is achieved, and convenience of the intelligent hydraulic floor door is improved;

1. by arranging the detection assembly, the detection box in the detection assembly is arranged at the central position of the door body and is matched with the temperature and humidity sensors arranged at the two sides of the door body, when the temperature and humidity sensor senses the outside humidity or the temperature has abnormal change, the abnormal change can be transmitted to the main control panel through the sensor, when the main control board drives the airtight assembly by command, the airtight assembly can effectively prevent other objects with smaller air tightness, such as rain, snow, hail in bad weather, etc., and then rain, snow and hail in bad weather, the top of the protective block can be controlled by the main control board to fold the air bag for inflation so as to inflate and expand the air bag, thereby can protect whole detection case from the top, avoid the hail under snow water and the bad weather to cause the damage to temperature and humidity sensor, influence the condition of the normal work of this equipment.

2. According to the invention, through the arrangement of the metal grating arranged in the door body, the effects of maintenance and uninterrupted ventilation on the underground space can be achieved, and the effects of maintenance and uninterrupted ventilation on the underground space are achieved by matching with the arrangement of the airtight assembly, when the airtight assembly is in severe weather change, the airtight assembly is transmitted to the main control board through the temperature and humidity sensor, so that the stroke cylinder is controlled to work, the airtight door can be pushed to oppositely move towards the middle part along the sliding grooves on the two sides of the door body under the driving of the stroke cylinder, until the ventilation opening of the metal grating is sealed and blocked, and the condition that external factors interfere with the internal space of the door body can be effectively blocked.

3. According to the invention, through the arrangement of the airtight assembly, under the condition of good weather, the temperature and humidity sensor transmits the temperature and humidity to the main control board, so that the travel cylinder is controlled to work, the airtight door can be pushed to move to two sides along the sliding grooves on two sides of the door body to be unfolded under the driving of the travel cylinder, the effect of uninterrupted ventilation is realized, the expansion door is rotated by 90 degrees along the damping rotating shaft, the warning tape and the strobe lamp at the bottom of the expansion door are leaked, the warning effect on passerby passing in the daytime and at night can be realized, the warning effect can be realized as far as possible, and the damage caused by the passerby stepping on the grille is avoided.

4. According to the invention, through the arrangement of the cleaning assembly, when the device is ventilated for a long time, the surface of the metal grating is stained with impurities or dust, and at the moment, the cleaning roller can be pushed by the electric telescopic rod to move along the inner part of the slide rail, so that the rotating cleaning roller drives the soft brush to clean the surface of the metal grating, the tidiness of the device is ensured, the cleaned dust can be collected by the storage box right below the cleaning frame, the subsequent unified treatment is convenient, the cleaning work of workers on the metal grating is reduced, and the automation process of the device is promoted.

5. According to the invention, through the arrangement of the limiting assembly, when the expansion door rotates by 90 degrees along the damping rotating shaft, the stay bar is pulled to rotate along the rotating shaft, meanwhile, the warning plate on the surface of the placement frame is unfolded, the clamping groove in the placement frame is leaked out, and through the clamping of the top block at the bottom of the stay bar and the clamping groove, the expansion door can be fixed, the working stability of the expansion door is improved, and the condition that the expansion door cannot warn when rotating under the blowing of wind is reduced.

Drawings

FIG. 1 is a schematic view of an overall closing structure of an intelligent hydraulic floor door with a warning function according to the present invention;

FIG. 2 is a schematic structural diagram of a detection assembly of an intelligent hydraulic floor door with an alarm function according to the present invention;

FIG. 3 is a schematic view of an overall closed and unfolded structure of an intelligent hydraulic floor door with warning function according to the present invention;

FIG. 4 is a schematic structural view of a cleaning assembly of an intelligent hydraulic floor door with warning function according to the present invention;

FIG. 5 is a schematic view of an airtight assembly of an intelligent hydraulic floor door with warning function according to the present invention;

fig. 6 is a schematic view of a partial structure of a position limiting assembly of an intelligent hydraulic floor door with a warning function according to the present invention.

In the figure: 1. a door body; 2. a detection component; 201. a detection box; 202. a main control board; 203. a temperature and humidity sensor; 204. a protection block; 205. folding the airbag; 3. a metal grid; 4. cleaning the assembly; 401. cleaning the rack; 402. a slide rail; 403. mounting a bracket; 404. an electric telescopic rod; 405. a cleaning roller; 406. soft brushing; 407. a storage box; 5. a chute; 6. a hermetic component; 601. a stroke cylinder; 602. an airtight door; 603. a sealing strip; 604. a damping rotating shaft; 605. an expansion door; 606. a warning band; 607. a strobe light; 7. a limiting component; 701. a rotating shaft; 702. a stay bar; 703. a top block; 704. a placement frame; 705. a rotating shaft; 706. a warning board; 707. a clamping groove.

Detailed Description

Referring to fig. 1-6, the present invention provides a technical solution: an intelligent hydraulic floor door with a warning function comprises a door body 1 and a limiting component 7, wherein the middle part of the door body 1 is provided with a detection component 2, a metal grid 3 is arranged below the detection component 2, a cleaning component 4 is arranged at the bottom of the metal grid 3, a sliding groove 5 is arranged on the surface of the door body 1, and an airtight assembly 6 is arranged inside the sliding chute 5, the airtight assembly 6 comprises a stroke cylinder 601, an airtight door 602, a sealing strip 603, a damping rotating shaft 604, an expansion door 605, a warning belt 606 and a stroboscopic lamp 607, the output end of the stroke cylinder 601 is connected with the airtight door 602, the right side of the airtight door 602 is provided with a sealing strip 603, the outer end of the airtight door 602 is connected with a damping rotating shaft 604, an expansion door 605 is arranged outside the damping rotating shaft 604, a warning belt 606 is arranged around the outside of the expansion door 605, a strobe lamp 607 is arranged on the surface of the expansion door 605, and the limiting component 7 is arranged on the upper surfaces of the airtight door 602 and the expansion door 605;

referring to fig. 1-2, the detection assembly 2 includes a detection box 201, a main control board 202, a temperature and humidity sensor 203, a protection block 204 and a folding airbag 205, the main control board 202 is disposed inside the detection box 201, the temperature and humidity sensor 203 is disposed outside the detection box 201, the protection block 204 is mounted on the top of the detection box 201, the folding airbag 205 is disposed inside the protection block 204, the temperature and humidity sensor 203 is electrically connected to the main control board 202, two groups of the temperature and humidity sensor 203 are disposed on two sides of the detection box 201, and the temperature and humidity sensor 203 and the detection box 201 are on the same horizontal plane;

the operation is as follows, through the arrangement of the detection component 2 in the middle of the door body 1, the detection box 201 in the detection component 2 is installed in the central position of the door body 1, and the temperature and humidity sensors 203 installed on both sides of the detection box are matched, when the temperature and humidity sensors 203 sense the abnormal change of the external humidity or temperature, the abnormal change can be transmitted to the main control board 202 through the sensors, when the main control board 202 drives the airtight component 6 to make a command, the airtight component can effectively prevent other objects with smaller air tightness, such as rainwater, snow water and hail under severe weather from corroding the underground space, and then meets the rainwater, snow water and hail under severe weather, the top folding airbag 205 can be inflated through the main control board 202 driving the rod protection block 204, the protection block 204 is internally provided with a miniature air pump to inflate and expand the protection box 201 from the upper part, and the damage of the temperature and humidity sensors 203 caused by the snow water and hail under severe weather can be avoided, conditions that affect the normal operation of the device;

referring to fig. 3, 5 and 6, the expansion door 605 and the airtight door 602 form a rotating structure through a damping rotating shaft 604, the maximum rotating angle of the expansion door 605 is 90 °, the shape and size of the expansion door 605 is consistent with the shape and size of the airtight door 602, two sets of strobe lights 607 are symmetrically arranged about the center of the expansion door 605, the strobe lights 607 are in a long strip shape, the limiting component 7 includes a rotating shaft 701, a strut 702, a top block 703, a placement frame 704, a rotating shaft 705, a warning plate 706 and a clamping groove 707, the strut 702 is arranged outside the rotating shaft 701, the top block 703 is connected to the outer end of the strut 702, the placement frame 704 is mounted on the upper surface of the airtight door 602, the placement frame 704 is connected with the warning plate 706 through the rotating shaft 705, the clamping groove 707 is formed on the surface of the placement frame 704, the expansion door 605 and the placement frame 704 form a fixed structure, and the placement frame 704 is fixedly connected with the expansion door 605, two sets of the placement racks 704 are symmetrically arranged about the center of the expansion door 605;

the operation is as follows, through the arrangement of the metal grating 3 arranged in the door body 1, the effects of maintenance and uninterrupted ventilation can be achieved for the underground space, the arrangement of the airtight component 6 is matched, when the airtight component meets the change of severe weather, the temperature and humidity sensor 203 transmits the temperature and humidity to the main control board 202 to control the stroke cylinder 601 to work, the airtight door 602 can be pushed to oppositely move towards the middle part along the sliding chutes 5 at the two sides of the door body 1 under the drive of the stroke cylinder 601 until the ventilation opening of the metal grating 3 is sealed and blocked, so that the condition that the external factors interfere with the internal space of the door body 1 can be effectively blocked, the temperature and humidity sensor 203 transmits the temperature and humidity to the main control board 202 to control the stroke cylinder 601 to work under the drive of the stroke cylinder 601, the airtight door 602 can be pushed to move towards the two sides along the sliding chutes 5 at the two sides of the door body 1 to be unfolded under the drive of the stroke cylinder 601, the effect of uninterrupted ventilation is realized, the extension door 605 is rotated by 90 degrees along the damping rotating shaft 604, the warning belt 606 and the strobe lamp 607 at the bottom of the extension door 605 are leaked out, the warning effect on passerby passing by can be realized both in the day and at night, the warning is realized as far as possible, the damage caused by stepping on the metal grating 3 by some people is avoided, when the expanding door 605 is rotated by 90 degrees along the damping rotating shaft 604, the stay 702 is pulled to be rotated and expanded along the rotating shaft 701, at the same time, the warning board 706 on the surface of the placing frame 704 is pulled to rotate and unfold along the rotating shaft 705, the warning plate 706 can also perform warning work on the side surface, then the clamping groove 707 in the placing frame 704 is leaked out, and through the clamping of the top block 703 at the bottom of the support rod 702 and the clamping groove 707, the expansion door 605 can be fixed, the working stability of the expansion door is improved, and the situation that the expansion door 605 cannot give warning work when rotating under the blowing of wind is reduced;

referring to fig. 3-4, the cleaning assembly 4 includes a cleaning frame 401, a slide rail 402, a mounting bracket 403, an electric telescopic rod 404, a cleaning roller 405, a soft brush 406 and a storage box 407, the slide rail 402 is mounted on both sides of the cleaning frame 401, the mounting bracket 403 is connected to the outer side of the slide rail 402, the electric telescopic rod 404 is mounted inside the mounting bracket 403, the cleaning roller 405 is connected to the output end of the electric telescopic rod 404, the soft brush 406 is disposed on the surface of the cleaning roller 405, the storage box 407 is mounted under the cleaning frame 401, the cleaning roller 405 is slidably connected to the slide rail 402 through the electric telescopic rod 404, the cleaning roller 405 is rotatably connected to the slide rail 402, the length of the cleaning roller 405 is identical to the width of the slide rail 402, the storage box 407 is slidably engaged with the cleaning frame 401, and the cleaning frame 401 is rectangular hollow;

specific operation is as follows, setting through clearance subassembly 4, this equipment is when long-time ventilation, metal grid 3 surface can be infected with impurity or dust, accessible electric telescopic handle 404 promotes scrub roller 405 along the inside removal of slide rail 402 this moment, make pivoted scrub roller 405 drive soft brush 406 and clean metal grid 3 surface, guarantee the clean and tidy nature of this equipment, the dust after cleaning can be collected by receiver 407 under clearance frame 401, convenient subsequent unified processing, the work of cleaning of staff to metal grid 3 has been reduced, lifting means's automation process.

In summary, when the intelligent hydraulic floor door with warning function is used, firstly, through the arrangement of the detection component 2 in the middle of the door body 1, the detection box 201 in the detection component 2 is installed at the central position of the door body 1, and is matched with the temperature and humidity sensors 203 installed on both sides thereof, when the temperature and humidity sensors 203 sense abnormal changes of outside humidity or temperature, the abnormal changes can be transmitted to the main control board 202 through the sensors, the main control board 202 drives the airtight component 6 to make it control the stroke cylinder 601 to work, the stroke cylinder 601 can drive the airtight door 602 to move oppositely towards the middle part along the sliding chutes 5 on both sides of the door body 1 under the driving of the stroke cylinder 601 until the ventilation opening of the metal grating 3 is sealed and blocked, and the sealing strip 603 on the inner side of the airtight door 602 can effectively block the interference of external factors to the inner space of the door body 1, and simultaneously, the protection block 204 is driven by the main control board 202 to inflate the top folded airbag 205, the protection block 204 is internally provided with a miniature air pump to enable the protection block to be inflated and expanded, so that the whole detection box 201 can be protected from the upper side, the damage of snow water and hail in severe weather to the temperature and humidity sensor 203 is avoided, the normal working condition of the device is influenced, under the good weather condition, the temperature and humidity sensor 203 is communicated to the main control board 202, the travel cylinder 601 is controlled to work, the airtight door 602 can be pushed to move to the two sides along the sliding grooves 5 on the two sides of the door body 1 under the driving of the travel cylinder 601 to be unfolded, the uninterrupted ventilation effect is realized, then, the extension door 605 is rotated for 90 degrees along the damping rotating shaft 604, the warning belt 606 and the strobe 607 at the bottom of the extension door 605 are leaked, the warning effect of passersby the pedestrians passing can be realized in the daytime and at night, the reminding as much as possible is realized, the damage caused by stepping on the metal grating 3 by certain people is avoided, when the extension door 605 is rotated for 90 degrees along the damping rotating shaft 604, the extension door is pulled to rotate along the rotating shaft 701, the extension rod 702 for 90 degrees Open, pull open simultaneously and place warning board 706 on frame 704 surface and make it rotate along rotation axis 705 and expand, this warning board 706 is in the side also can accomplish the warning work, leak the joint groove 707 of placing the frame 704 inside next, through the block of the kicking block 703 of vaulting pole 702 bottom and the block of joint groove 707, can realize the fixed of expansion door 605, promote the steadiness of its work, reduce the condition that expansion door 605 can't make the warning work of rotating under the blowing of wind, finally when equipment ventilates for a long time and uses, inside metal grid 3 surface can be infected with impurity or dust, can promote cleaning roller 405 along the inside removal of slide rail 402 through electric telescopic link 404 at this moment, make the rotatory cleaning roller 405 drive soft brush 406 and clean metal grid 3 surface, guarantee the neatness of this equipment, the dust after cleaning can be collected by receiver 407 under cleaning frame 401, facilitate subsequent unified processing, the cleaning work of workers on the metal grating 3 is reduced, and the automation process of the equipment is improved.

Claims

1. The intelligent hydraulic floor door with the warning function is characterized by comprising a door body (1) and a limiting assembly (7), wherein a detection assembly (2) is installed in the middle of the door body (1), a metal grid (3) is arranged below the detection assembly (2), a cleaning assembly (4) is arranged at the bottom of the metal grid (3), a sliding groove (5) is formed in the surface of the door body (1), an airtight assembly (6) is arranged inside the sliding groove (5), the airtight assembly (6) comprises a stroke cylinder (601), an airtight door (602), a sealing strip (603), a damping rotating shaft (604), an expansion door (605), a warning belt (606) and a frequency flash lamp (607), the output end of the stroke cylinder (601) is connected with the airtight door (602), the sealing strip (603) is arranged on the right side of the airtight door (602), and the outer end of the airtight door (602) is connected with the damping rotating shaft (604), the outer part of the damping rotating shaft (604) is provided with the expansion door (605), the warning belt (606) is arranged on the outer periphery of the expansion door (605), the strobe lamp (607) is arranged on the surface of the expansion door (605), and the limiting component (7) is arranged on the upper surfaces of the airtight door (602) and the expansion door (605).

2. The intelligent hydraulic floor door with the warning function according to claim 1, wherein the detection assembly (2) comprises a detection box (201), a main control board (202), a temperature and humidity sensor (203), a protection block (204) and a folding airbag (205), the main control board (202) is arranged in the detection box (201), the temperature and humidity sensor (203) is arranged outside the detection box (201), the protection block (204) is installed at the top of the detection box (201), and the folding airbag (205) is arranged inside the protection block (204).

3. The intelligent hydraulic floor door with the warning function according to claim 2, wherein the temperature and humidity sensors (203) are electrically connected to the main control board (202), two sets of the temperature and humidity sensors (203) are arranged on two sides of the detection box (201), and the temperature and humidity sensors (203) and the detection box (201) are on the same horizontal plane.

4. The intelligent hydraulic floor door with the warning function according to claim 1, wherein the cleaning assembly (4) comprises a cleaning frame (401), a sliding rail (402), a mounting bracket (403), an electric telescopic rod (404), a cleaning roller (405), a soft brush (406) and a storage box (407), the sliding rail (402) is mounted on two sides of the cleaning frame (401), the mounting bracket (403) is connected to the outer side of the sliding rail (402), the electric telescopic rod (404) is mounted inside the mounting bracket (403), the cleaning roller (405) is connected to the output end of the electric telescopic rod (404), the soft brush (406) is arranged on the surface of the cleaning roller (405), and the storage box (407) is mounted under the cleaning frame (401).

5. The intelligent hydraulic floor door with the warning function according to claim 4, wherein the cleaning roller (405) is slidably connected with the sliding rail (402) through the electric telescopic rod (404), the cleaning roller (405) is rotatably connected with the sliding rail (402), and the length dimension of the cleaning roller (405) is matched with the width dimension of the sliding rail (402).

6. The intelligent hydraulic floor door with the warning function according to claim 4, wherein the storage box (407) is connected with the cleaning frame (401) in a sliding and clamping manner, and the cleaning frame (401) is of a rectangular hollow structure.

7. The intelligent hydraulic floor door with the warning function as claimed in claim 1, wherein the expansion door (605) and the airtight door (602) form a rotating structure through the damping rotating shaft (604), the maximum rotating angle of the expansion door (605) is 90 °, and the shape and size of the expansion door (605) are consistent with the shape and size of the airtight door (602).

8. An intelligent hydraulic floor door with a warning function as claimed in claim 1, wherein the stroboscopic lamps (607) are symmetrically arranged in two groups about the center of the expansion door (605), and the stroboscopic lamps (607) are long.

9. The intelligent hydraulic floor door with the warning function according to claim 1, wherein the limiting component (7) comprises a rotating shaft (701), a support rod (702), a top block (703), a placing frame (704), a rotating shaft (705), a warning plate (706) and a clamping groove (707), the support rod (702) is arranged outside the rotating shaft (701), the top block (703) is connected to the outer end of the support rod (702), the placing frame (704) is installed on the upper surface of the airtight door (602), the placing frame (704) is connected with the warning plate (706) through the rotating shaft (705), and the clamping groove (707) is formed in the surface of the placing frame (704).

10. The intelligent hydraulic floor door with the warning function according to claim 9, wherein the extension door (605) and the placement frame (704) form a fixed structure through the stay bar (702), the placement frame (704) is fixedly connected with the extension door (605), and the placement frame (704) is symmetrically arranged in two groups with respect to the center position of the extension door (605).