KR20160101641A - Pulling up floodgate having monolithic structure of cylinder - Google Patents

Abstract

The present invention relates to a cylinder integrated lifting floodgate, wherein a support unit protrudes from one side of a casing having a cylinder therein to enable a cylinder rod connected to the cylinder to be exposed to the outside, and the cylinder rod connected to a door plate mounted on a door frame when the casing is fixated to an upper side of the door frame through the support unit. Moreover, the casing connected to enable at least one side of the door plate to be stored therein is connected to prevent the casing from facing downward through a support plate provided to the door frame.

Description

{PULLING UP FLOODGATE HAVING MONOLITHIC STRUCTURE OF CYLINDER}

The present invention is characterized in that a casing is provided with a cylinder in which a cylinder rod connected to a cylinder is exposed to the outside and a support portion is protruded on one side thereof and a casing mounted on the door frame when the casing is fixed to the upper side of the door frame through the support portion And a casing connected to a cylinder rod and connected to at least one side of the door frame so as to be connected through a support plate provided at an upper end of the door frame so as to prevent downward movement.

Generally, a water gate is installed in a river or a river dam or a reservoir to confine or discharge water. The water gates installed in this manner are connected to a mechanical or hydraulic type water gate opening / closing device, and the water gate opening and closing device is opened and closed when hydraulic pressure is supplied.

However, such conventional gates are not only complicated in their installation structure, but also in operation.

In addition, not only a hydraulic cylinder but also a hydraulic cylinder is equipped with a device for preventing damages of a cylinder rod which opens and closes a gate while lifting and lowering. In addition, the waterproof rubber is firmly attached to the inner surface of the door frame And could not perform the exponential function perfectly.

As a result, conventional gates are very complicated in construction and inconvenient to install and use. Also, installation cost is high, operation is not perfect, and service life is short, There is a problem that a large cost is spent more than necessary for maintenance.

In connection with such a technique, the applicant of the present invention has proposed a water-borne technique in a conventional Korean Patent No. 523818, and its constitution is shown in Fig. 1 and Fig. 2, in a river or a river dam or a reservoir Both sides of the water gate 20 are coupled to the door frame 10 to be installed and the water gate 20 is lifted up and down by the lifting operation of the hydraulic cylinder 30 installed upside down with the water gate 20, The hydraulic cylinder 30 is installed inside the closed cylinder mounting portion 21 formed at both ends of the gate 20 and the fixing member 32 at the lower end of the hydraulic cylinder 30, The horizontal elongated hole 32a provided in the door frame 10 is coupled to the cylinder bracket 11 integrally formed at the upper end of the door frame 10 with the fixing pin 33 so that the hydraulic cylinder 30 is guided by the horizontal elongated hole 32a And is fixedly installed so as to be capable of changing position before and after the hydraulic pressure, The end of the cylinder rod 31 of the cylinder 30 is fixedly installed inside the lower end of the cylinder installation part 21 of the water gate 20 and the opposite ends of the cylinder rod 31 are connected to each other at positions corresponding to the water gate 20 and the door frame 10 Wedges 12 and 22 each having an inclined surface are formed so as to protrude to close the water gate 20 so that the water gate 20 is pushed forward while the water gate 20 is closed, And the upper surface of the door frame 10 is provided with an index rubber at a position higher than the upper ends of the wedges 12 and 22 and at an upper position than the upper ends of the waters 20, The protective guide rail 13 is protruded so that the protrusion 23 formed on the upper side of the water gate 20 when the water gate 20 moves up and down is brought into close contact with the guide rail 13 for protecting the exposing rubber 20, The state in which the exposing rubber 25 provided on the door 20 is in close contact with the inner surface of the door frame 10 is released so that damage to the exposing rubber 25 is prevented The hydraulic cylinder 20 is prevented from moving forward and backward by the guide rails 13 and wedges 11 and 22 even when the hydraulic gate 20 is advanced and retreated repeatedly, Since the horizontal elongated hole 32a provided in the fixing member 32 at the lower end of the body of the hydraulic cylinder 30 is fixed by the fixing pin 33 to the water gate 20 under the guidance of the horizontal elongated hole 32a, So that the impact is relieved to prevent the hydraulic cylinder 30 from being damaged.

However, the lifting gate is disadvantageous in that the fixing pin 33 inserted in the horizontal elongated hole 32a is subjected to shearing, thereby decreasing durability.

In addition, when the fixing pin 33 is loosened, the hydraulic cylinder 30 is hardly engaged, and horizontal slits are made to coincide with each other.

Both sides of the water gate 20 supported by the door frame 10 are supported only by the cylinder bracket 11 integrally formed at the upper end of the door frame 10 so as to correspond to the door frame 10, In order to be supported at the center of the hydraulic cylinder 30, that is, at a point equally spaced t1 from the inside of the door frame, it is stored to a certain depth inside the door frame 10, There is a drawback that it becomes difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned problems of the related art by minimizing the space of the guide hole for supporting the door, thereby preventing the accumulation of sand and facilitating the assembly of the lifting gate and increasing the durability of the lifting gate. The present invention is to provide a cylinder lifting sluice gate which prevents deformation of a sluice gate and a cylinder, accurately measures opening state of a gateper, and minimizes noise caused by sliding of a casing.

In order to achieve the above-described object, the present invention provides a door structure for a vehicle, which is connected to an upper portion of a door frame by directly connecting a support portion to one side of a cylinder connected to a doorway by a cylinder rod

Wherein the cylinder is installed in a hermetically closed state, and a supporting portion is provided on one side of the casing in which the cylinder rod connected to the door frame is exposed so as to be connected to the upper side of the door frame,

And a supporting portion provided on one side of the cylinder or the casing so as to be supported on a support plate connected to the upper end of the door frame,

The door frame is supported on a support plate positioned on the upper end of the door frame, and is installed to be moved in a vertical direction in a state in which both sides are supported by a U-shaped guide hole provided in the door frame when the cylinder is operated.

The door frame is positioned through the support plate and the guide hole is formed so that the center of the cylinder mounted on the door frame is eccentrically positioned outside the center in the depth direction of the guide hole,

The fixing plate formed to protrude from both sides of the door frame and both the front and rear sides of the door frame so as to be evenly supported is further connected to the top of the door frame so as to prevent eccentrically supporting the center of the cylinder, Thereby providing a cylinder-integrated lifting gate.

The door of the present invention is provided with a water overflow preventing jaw at a connection portion with a casing, and a foreign matter discharge hole is further provided at the bottom of the doorway.

According to another aspect of the present invention, a wire protection pipe is connected through a casing to an inside of a casing, and when one end of an opening pipe inserted into the wire protection pipe is connected to a rod, And the wire opening system is provided with a cylinder-integrated lifting gate including an encoder installed to measure a descent distance of the opening pipe.

In addition, according to the present invention, the positioning means is further connected to the upper side of the fixing plate,

Wherein the positioning means comprises a protective cover connected to the upper side of the support plate,

The support plate is further provided with a sliding pad,

The protective cover provides a cylinder-integrated salvage gate in which an upper portion of the cylinder or casing is exposed while an opening is formed to support the side surface of the cylinder or the casing while preventing vertical movement of the support portion.

The protective cover may further include a sliding pad at a contact portion between the support plate and the support portion. The protective cover may include a plurality of side plates connected in the vertical direction of the support plate, A cylinder-integrated lifting sluice comprising an assembly structure of an upper plate.

The support plate of the present invention provides a cylinder-integrated lifting gate which is fixed by a bracket-integrated fixing plate coupled to the upper side of the door frame.

In addition, the cylinder of the present invention has a structure in which the cylinder rod is connected to the upper end of the door frame or a part of the cylinder is embedded in the door, and the cylinder rod is connected to the lower end of the door frame. .

As described above, according to the present invention, it is possible to minimize the space of the guide hole supporting the door to minimize the accumulation of sand while supporting the door frame, thereby facilitating the operation of the door, facilitating the assembly of the lifting gate, increasing the durability of the lifting gate, It is possible to prevent the deformation of the cylinder and the cylinder, accurately measure the open state of the door, and minimize the noise caused by the sliding of the casing.

1 and 2 are respectively a side view and an enlarged view of a conventional salvage gate.
FIG. 3 is a view showing the support state of the lifting water door according to the present invention in comparison with the prior art.
4 and 5 are a front view and a side view, respectively, showing the installed state of the lifting jacket according to the present invention.
Fig. 6 is a perspective view of the recess of the lifting jacket according to the present invention.
7 is an exploded state view of the lifting gate door positioning means and the casing according to the present invention.
8 and 9 are a state diagram and an exploded view, respectively, of the positioning means according to the present invention.
10 is a state in which the opening device of the lifting means according to the present invention is connected.
Figs. 11 to 13 are explanatory views of the recessed portion showing the positioning means of the lifting gate according to another embodiment of the present invention, respectively.
14 and 15 are connection state diagrams of the lifting gate according to another embodiment of the present invention, respectively.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 and 5 are a front view and a side view, respectively, showing the installation state of the lifting water door according to the present invention, and FIG. 6 is a side view showing the state of the lifting water door according to the present invention. 7 is a disassembled state diagram of the lifting water door positioning means and the casing according to the present invention, and Figs. 8 and 9 are diagrams showing the state of engagement of the lifting water door positioning means according to the present invention 11 to 13 are explanatory views of the recessed portion showing the positioning means of the lifting water door according to another embodiment of the present invention, and Fig. 14 is an exploded view of the lifting means according to another embodiment of the present invention, And Fig. 15 is a connection state diagram of the lifting gate according to another embodiment of the present invention, respectively.

The float gate 100 of the present invention is configured such that the door frame 150 is supported and mounted by door frames 110 on both sides having a guide hole 119 which is recessed inward in a U-shape.

The door frame 150 is installed to lift and lower the door frame 150 from the inside of the door frame through the casing 200 connected to the upper end of the door frame 110 and the lower end of the door frame 150.

In addition, a cylinder 170 is hermetically installed in the casing 200, and a part of the cylinder rod 175 connected to the cylinder 170 is installed so as to be exposed to the outside.

That is, the cylinder 170 has a hermetically sealed structure that is integrally built in the inside of the casing 200 to which one side is coupled to the door frame 110, and a cylinder rod 175 connected to the cylinder is disposed outside the casing 200 And is exposed.

When the cylinder rod 175 is connected to the lower side of the door frame 150, at least one side of the casing 200 in which the cylinder is enclosed is housed in the door frame 150, , And one side of the casing (200) is installed and exposed on the upper side of the door frame (150) when descending.

In addition, a supporting portion 210, which is supported at the upper end of the door frame 110, is installed to protrude in the width direction of the casing in any one of the upper, lower and one side of the casing 200.

The casing 200 has a shape selected from a circular shape or a rectangular shape.

14 and 15, the supporting part 210 may be directly installed on one side of the cylinder 170 without a separate casing, and may be connected to the door frame 110.

The cylinder 170 is connected to the upper portion of the door 150 or at least a portion of the cylinder 170 is accommodated and then a cylinder rod 175 is connected to the cylinder 150. [ It may be connected to the bottom.

The supporting portion 210 may be formed in various shapes as long as it protrudes from the cylinder or the casing. In the present invention, the support portion 210 may be formed in any one of the upper, lower, And a supporting plate 210b integrally connected along the periphery of one of the two support rods 210a, the upper end of the cylinder, the lower end, and the one side in the height direction.

In addition, the support part 210 may include a supporting bracket 210c, which is connected to the upper end of the cylinder or the casing, and a support hole 210a, which is inserted into the support hole.

When the cylinder 170 or the casing 200 is supported on the upper end of the door frame 110 through the support portion 210, the cylinder rod exposed from the cylinder or the casing is inserted into the door frame 150, And is connected to the lower portion through the door.

At this time, although the cylinder rod may be connected to the inside of the door space 150, since the connecting portion is not exposed, the workability is lowered, and the cylinder rod is preferably connected through the lower side of the doorway vertically.

When the cylinder rod 175 is connected to the door frame 150, at least one side of the cylinder or the casing 200 is connected to the door frame 150 so as to be embedded therein.

The cylinder 170 and the casing 200 which are integrally connected to the door frame 110 when the cylinder or the casing 200 is supported on the support plate 310 of the door frame 110 Let the government rise and fall.

At this time, the support portion is installed to move in the horizontal direction while sliding on the upper side of the support plate.

When the support plate 310 is connected to the upper end of the door frame through a fixing plate, the mounting hole 313 is formed so that the cylinder or the casing is inserted and moved in at least one direction while preventing the downward movement of the support portion. A sliding pad 350 is further provided on the upper side.

In addition, the door frame 150 further includes a water overflow prevention tongue 155 at a connection portion with the cylinder or the casing 200, and a foreign matter discharge hole 157 is further provided at the bottom of the door frame 150.

A wire protection pipe 410 is connected to the inside of the casing 200 through a casing and one end of an opening pipe 430 inserted into the wire protection pipe 410 is connected to the cylinder rod, A wire 450 of a wire elbow system 400 attached to the upper portion of the casing 200 is connected to the other end of the opening pipe 430 to detect movement of the opening pipe 430 by a wire .

At this time, the wire elongation system 400 is composed of an encoder installed to measure the descending and the rising distance of the opening pipe 430, and the wire is connected to the opening pipe 430 so as to always have a constant tensile force in the wire elongation system do.

Meanwhile, the wire protection pipe 410 may be connected to the outside of the cylinder 170 installed in a nude state.

In addition, the positioning means 300 is further provided on the upper side of the support plate, and the positioning means is formed as a protective cover 330 connected to the upper portion of the support plate. The support portion 210 protruding from the cylinder or the casing 200 A space S for preventing downward and upward movement is integrally formed.

That is, the positioning means is formed in a box shape that covers the bottom surface of the support portion 210 so as to prevent it from coming off while being in contact with at least one of the side surface and the upper surface.

The protection cover 330 includes an assembly structure of a plurality of side plates 331 connected in the vertical direction of the support plate and an upper plate 333 having an opening 331a connected to the upper side of the side plate. The top of the cylinder or the casing may be exposed through the opening of the cover or the top may be exposed so that one side of the cylinder or the casing is inserted into the opening.

In addition, the wire is connected to the opening pipe of the casing through the opening through which the upper part of the cylinder or casing is exposed, or the hydraulic pipe 209 or the like is connected to supply the hydraulic pressure to the cylinder.

3, the door frame 110 is positioned through the support plate 310 and the center C of the cylinder 170 mounted on the upper end of the door frame 110 is inserted into the guide hole 119, The depth of the guide hole is minimized so that the guide hole moves to a position outside the center line C1 in the depth direction of the guide groove.

At this time, the support plate 310 supporting the cylinder or the casing 200 is exposed to the front of the door frame 110, and the support plate 310 is moved a predetermined distance (dt) from the door frame 110, The fixing plate 370 having a U-shaped shape so as to be exposed from the door frame is further connected to the upper side of the door frame 110 so as to be eccentrically supported on the upper side.

In addition, the fixing plate 370 is formed in a U-shape protruding from both sides of the door frame 110, the rear side thereof and the front side both sides thereof.

That is, in order to minimize the accumulation of the sand, in order to evenly support the guide hole which is eccentrically positioned on the upper side of the door frame when the door frame 150 is installed in the guide hole formed at the minimum depth, And the load acting on the supporting portion of the cylinder must be evenly distributed. In the present invention, the fixing plate 370, which has an area larger than that of the door frame 110, is welded to the upper side of the door frame 110 to solve this problem.

The fixing plate 370 further includes a plurality of brackets 371 fixed to the side surface of the door frame 110 so as to prevent deflection of a portion protruding from the door frame 110, And is formed to have an area larger than the plate 310.

The operation of the present invention constructed as described above will be described.

3 to 15, the float gate 100 of the present invention has a structure in which door frames 150 supported by the door frames 110 on both sides are connected to the upper end of the door frame 110, 170 is operated, the door openings are lifted from the inside of the door frame.

At this time, the cylinder 170 is a sealed type built in a casing 200 having a rectangular or circular shape. Especially, when the cylinder 170 is in a rectangular shape, foreign substances are prevented from entering the inside of the casing, The arrangement of the hydraulic pipes and the like is facilitated through the space formed in the partition.

In addition, the cylinder 170 may be further provided with a casing 200, but may be installed in a nude state exposed without a separate casing.

A cylinder rod 175 connected to the cylinder is installed so as to be exposed to the outside of the casing 200. When only the cylinder rod 175 is lifted and raised in the state of being exposed from the inside of the door frame during operation of the cylinder 200, ) Are stored and exposed on the upper side of the door.

The cylinder 170 is fixed to the upper end of the door frame 110 through a support portion 210 connected to the upper end of the casing 200 when the door is installed in the casing 200, 110) to move up and down.

The cylinder rod exposed from the casing 200 passes through the door frame 150 mounted on the door frame 110 and is connected to the lower side of the door frame 110. When the cylinder rod 175 is connected to the door frame 150, Is connected to the door frame 150 so as to be embedded therein, and is supported through the casing, thereby preventing damage to the cylinder.

In addition, the door frame 150 may further include a water overflow prevention tongue 155 at a connection portion with the casing 200 to prevent foreign matter flowing over the doorway from flowing into the inside of the door into which the casing is inserted, And the casing 200 through the foreign matter discharge hole 157 formed at the bottom of the doorway.

In addition, the supporting unit 210, which is protruded beyond the width of the casing, is integrally installed at any one of the upper, lower, or one side of the casing 200, and positioning means 300, the downward movement is prevented, and the door is raised or lowered to a certain height.

The positioning means 300 for supporting the casing 200 installed at the upper end of the door frame 110 includes a casing for supporting the door frame 110 when the door frame 110 is moved in one direction or more, 200 are simultaneously moved through the support to prevent the cylinder rod protruding from the cylinder from being deformed when a door load is generated around the casing.

14 and 15, the same operation can be performed even if the supporting part 210 is directly installed on one side of the cylinder 170 and connected to the door frame 110 without a separate casing.

The cylinder 170 is connected to the upper portion of the door 150 or at least a portion of the cylinder 170 is accommodated and then a cylinder rod 175 is connected to the cylinder 150. [ The same operation is possible even if connected to the bottom.

In addition, when the positioning means 300 is fixed to the upper end of the door frame, the cylinder or the casing is prevented from moving downward at least in one direction while preventing the downward movement of the support portion. And a protection cover (330) installed to prevent the cylinder or the casing from moving in the vertical direction while being positioned. The space for inserting the support part (210) is formed inside the support plate and the protective cover This is possible.

At this time, the support plate 310 is provided with a sliding pad 350 at a contact portion of the support portion to minimize friction, thereby facilitating sliding of the support portion 210 without generating noise and abrasion.

The support portion 210 includes two support rods opposed to each other at either the top, bottom, or one side of the height direction of the cylinder or casing,

And a support plate integrally connected along the periphery of one of the cylinders or the casing top, bottom, and one side of the height direction, so that the connection height and the connection structure are variously installed at one side of the cylinder or the casing It is possible to use variously according to the local conditions.

In addition, the supporting part 210 may be constructed by assembling a support bar which is inserted into the support hole of the bracket formed with the support hole while being connected to the upper end of the cylinder bore casing, so that the same effect can be realized.

The support plate is coupled to a fixed plate 370 integrally formed with a bracket 371 connected to the upper side of the door frame. The bracket 371 protrudes from the side surface of the door frame to support the eccentrically- And is integrally connected to the front of the fixing plate 370.

At this time, since the fixing plate 370 has an area larger than the circumference of the door frame, there is no restriction due to the installation of a large-sized structure such as a door frame, so that a concrete structure or the like It is possible to mount equipments without increasing the size.

The bracket 371 is integrally fixed to the bottom surface of the fixing plate 370 while being fixed to the side surface of the door frame 110 in a triangular or various shape in which at least two surfaces are connected by welding or the like, Thereby preventing defective support of the support plate due to deflection or the like.

The protective cover 330 has an assembly structure of an upper plate 333 having a plurality of openings of the side plates 331 connected to each other in the vertical direction of the support plate. After assembling the side plates to the support plate, When the upper plate is assembled on the upper side, the protective cover is completed to prevent the supporting portion from coming off.

When the cylinder rod 175 is exposed around the cylinder or the casing 200 and the door frame 150 is lowered, the wire 450 is inserted into the wire protection pipe 410, The wire pipe degassing system 400 can accurately confirm the degree of the closing of the operation door by drawing out the wire 450.

At this time, the wire opening system 400 includes an encoder installed to measure the descending distance of the opening pipe 430, and connected to the opening pipe 430 when the opening pipe 430 descends, The distance of descent of the doorway is measured.

3, the door frame 110 is positioned through the support plate 310 and the center C of the cylinder or the casing 200 mounted at the upper end of the door frame 110 in the transverse direction is inserted into the guide hole The depth of the guide hole 119 is minimized so as to minimize accumulation of sand and the like when the guide member 119 is moved to a position outside the depth-direction center line C1 of the guide member 119 by a predetermined distance dt.

That is, both sides of the door frame 150 are supported at the minimum depth, thereby preventing defects such as rising and falling due to sand accumulation.

In order to solve the problem that the support plate 310 supporting the cylinder or the casing 200 is exposed at the front of the door frame 110 and eccentric from the upper end of the door frame 110, The supporting plate 310 eccentric by the distance dt is further connected to the upper side of the door frame 110 with a fixing plate 370 having a U-shape to evenly support the door frame 110 from above, I will.

That is, while the depth of the guide hole is minimized, the support plate for supporting the cylinder or the casing is supported on the upper side of the door frame 110 without being eccentric through the fixing plate 370.

100 ... salvage water gate 110 ... door frame
150 ... doorway 170 ... cylinder
200 ... casing 210 ... support
300 ... positioning means 400 ... wire opening meter
430 ... opening pipe

Claims (8)

The supporting portion is directly installed on one side of the cylinder to which the cylinder rod is connected and the cylinder is connected to the upper side of the door frame
And a casing is connected to the upper side of the door frame by providing a supporting part on one side of the casing in which the cylinder rod is exposed to the door,
And a support portion protruding from one side of the cylinder or the casing is supported on the upper side of the support plate connected to the upper end of the door frame,
The door frame is supported on a support plate positioned on the upper end of the door frame of both the side doors, and is installed to be moved in a vertical direction in a state where both sides are supported by a C-shaped guide hole provided at both sides of the cylinder in operation,
Wherein the door frame is formed with a guide hole such that the center of the cylinder mounted on the door frame is positioned eccentrically outside the center in the depth direction of the guide hole when the door frame is positioned in the door frame through the support plate,
Wherein the fixed plate exposed from the door frame is further connected to the upper end of the door frame so as to prevent the support plate, which is installed at the center of the cylinder from being eccentrically supported in the guide hole, from being eccentrically supported from above the door frame. 2. The apparatus according to claim 1, further comprising positioning means on the upper side of the support plate,
Wherein the positioning means comprises a protective cover connected to an upper side of a support plate having a mounting hole into which a casing or a cylinder is inserted and in which a space for mounting a support portion is formed,
The support plate is further provided with a sliding pad,
Wherein the protective cover is provided with an opening for exposing an upper portion of the casing or the cylinder or for supporting a side surface of the casing or the cylinder while preventing vertical movement of the supporting portion. 2. The cylinder-integrated salvage gate as claimed in claim 1, wherein the door is further provided with a water overflow preventing jaw at a connection portion between the casing and the cylinder, and further comprises a foreign matter discharge hole at the bottom. The wire protecting apparatus according to claim 1, wherein a wire protecting pipe is connected to the inside of the casing through a casing, and when one end of the opening pipe inserted into the wire protecting pipe is connected to the cylinder rod, And a wire of an opening system is connected. 2. The fuel cell system according to claim 1, wherein the support portion comprises: two support rods provided opposite to the periphery of the upper end, the lower end, and the one side in the height direction of the casing or the cylinder; upper and lower ends of the casing or cylinder; And a support plate integrally connected along the periphery of the cylinder. [2] The apparatus of claim 1, wherein the support portion comprises an assembling structure of a support bar inserted into the support hole of the bracket formed with the support hole while being connected to the upper end of the casing or the cylinder,
Wherein the casing is formed in any one shape selected from a square or a circular shape, and a hydraulic pipe connected to a built-in cylinder is installed so as to be exposed to the outside of the upper side. 3. The apparatus of claim 2, wherein the protective cover comprises a plurality of side plates connected in a vertical direction of the support plate, and an assembly structure of an upper plate connected to an upper portion of the side plate and having a casing or cylinder inserted or exposed Features a cylinder-integrated salvage gate. The bracket as claimed in claim 1, wherein the fixing plate is installed on both side surfaces of the door frame, rear side and front side, and is fixed to the side surface of the door frame so as to prevent sagging from protruding from the door frame, Are further integrally coupled,
Wherein the cylinder is constituted by any one structure selected from a structure in which the cylinder rod is connected to the upper end of the door frame or the cylinder rod is connected to the lower end of the door frame in a state where a part of the cylinder is embedded in the door. .

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