KR101875079B1 - Method for checking safe opening and closing door of the hyperbaric oxygen chamber - Google Patents

Abstract

The present invention relates to a method for checking whether a door of a hyperbaric oxygen chamber is opened or closed so that the door can be opened or closed only when it is safe. The method according to the invention includes the steps of: measuring atmosphere of an inner space; automatically releasing a locking pin, which is able to reciprocate horizontally in a locking groove of a rod member, from the locking groove in case the atmosphere of the inner space is less than 0.5 bar; sending first information on the release of the locking pin from the locking groove received from a locking pin detecting sensor to an opening/closing display; and if the first information is received and second information on the atmosphere of the inner space which is less than 0.5 bar is received, visually displaying that the door can be opened or closed.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for determining whether a high-pressure oxygen chamber can be safely opened and closed,

The present invention relates to a method for confirming whether or not a door portion of a high-pressure oxygen chamber can be opened or closed so that the door portion can be opened and closed only when it is safe.

The high-pressure oxygen chamber is the main equipment used in high-pressure oxygen therapy. It is a treatment for breathing for 1 hour to 2 hours with 100% purity or a very high concentration of oxygen in a state of rising above the normal respiratory environment. It is used to effectively supply oxygen to tissue cells damaged by edema, germ infection, etc. to improve the therapeutic effect and quality.

The high-pressure oxygen chamber is provided with an entrance for accommodating the patient, but there is a problem that oxygen is leaked through the entrance during the treatment of high-pressure oxygen. High-pressure oxygen therapy is a treatment for treating a patient with high-pressure oxygen. Because oxygen is used at high pressure, it is easily exposed to a fire or an explosion. Therefore, it is important to strongly prevent oxygen leakage from the entrance.

Prior art Patent Document 1 (Korean Patent Registration No. 10-1711189 (Publication Date: 2017.03.07)) relates to a high-pressure oxygen chamber which securely and tightly seals an entrance of a chamber to maintain a pressure of high-pressure oxygen therein.

In the prior art document 1, the door 20 rotates the rod member 30 with the handle 500 so that the sealing member 400 having an egg-shaped cross section seals the door 30 in the direction of the entrance 20, The door 20 is sealed so that the door portion 30 does not allow the high pressure of the internal space 20 to escape to the outside.

However, the prior art document 1 has an advantage that a high sealing effect can be obtained only by a simple operation. However, since there is no separate locking device, there is a problem that when the door portion is opened by turning the handle portion, a high pressure is leaked even when the internal space is maintained at a relatively higher pressure than the atmospheric pressure, .

In order to solve this problem, it is possible to open and close the door part according to the judgment of an experienced user while visually confirming the internal pressure value by providing a pressure sensor for measuring the air pressure of the internal space. However, There is a need for a device that intuitively guides you whether you are.

However, if a general locking device is installed and the door can not be opened and closed firmly, it is necessary to open / close the door part quickly even if a high pressure is exerted when a topic or an emergency occurs inside. It is necessary to manually open and close the door part.

Prior Art Patent Document 1: Korean Registered Patent No. 10-1711189 (Publication Date: Jul.

It is an object of the present invention to provide a locking device for blocking the rotation of a rod member for rotating a sealing member for opening and closing a door portion of the door according to the internal pressure.

It is a further object of the present invention to enable the locking device to be operated only at the correct position and at the same time to ascertain whether the locking device is operating.

It is another object of the present invention to provide a high-pressure oxygen chamber which can intuitively inform the user whether it can be opened or closed, even if the pressure is somewhat high, even when the pressure is high enough to prevent the opening.

In order to achieve the above object, the present invention provides a method for confirming whether a door portion of a high-pressure oxygen chamber can be opened or closed, comprising the steps of: measuring an internal space pressure; Closing the lock pin, which can be reciprocally moved in the horizontal direction inserted into the lock pin, automatically separates from the lock groove, transmitting to the opening / closing display unit first information that the lock pin has disengaged from the lock groove, 1 information is received and the second information that the air pressure of the internal space is less than 0.05 bar is received, the step of visually displaying the opening / closing display unit is made possible.

In addition, in the method of confirming whether the high-pressure oxygen chamber can be opened or closed according to the present invention, when the pressure of the internal space is less than 0.5 bar and not less than 0.05 bar after the step of detaching the lock pin from the lock groove, And an emergency opening / closing enabling indication that the forced opening is physically possible in an emergency situation.

According to the present invention, first, an inexperienced user can not turn the knob portion even while maintaining a relatively higher pressure than the atmospheric pressure in the inner space, thereby solving the problem that the user is surprised or accidents due to leakage of high pressure have.

Second, when the pressure inside the high-pressure oxygen chamber is operating at a specific pressure or higher through a lock pin that automatically reciprocates in accordance with the inner space pressure of the high-pressure oxygen chamber, it can be automatically closed by the lock pin have.

Thirdly, the high-pressure oxygen chamber according to the present invention further includes an internal pressure measuring unit for measuring the pressure in the chamber, and by visually displaying the internal pressure, it is possible to accurately grasp the internal pressure from the outside.

Fourthly, the locking device according to the present invention includes a lock pin detection sensor that senses a change in the position of the lock pin in the horizontal direction and detects whether the lock pin is inserted into the lock groove, So that the locking device can be prevented from being damaged.

Fifth, the high-pressure oxygen chamber according to the present invention visually indicates that the lock pin is detached from the lock groove from the lock pin detection sensor and is openable and closable to the user through the display unit only when the internal pressure is less than 0.05 bar. This allows a relatively high pressure of 0.5 bar to be released even at pressures that are not fatal to the user when opened, allowing the door to be opened without any pressure dropping when an emergency occurs inside the chamber. At the same time, when the pressure is extremely low at 0.05 bar, it is determined that the door is completely safe, so that it is possible to visually indicate that the door can be opened, so that the door can be safely opened.

1 and 2 are views showing a door portion of a high-pressure oxygen chamber according to the present invention, respectively, opened and closed.
Figs. 3 and 4 are enlarged views of the locking part shown in Figs. 1 and 2. Fig.
5 is a sectional view of the high-pressure oxygen chamber in a closed state in which the lock pin is inserted.
6 is a cross-sectional view showing a state in which the lock pin is released and the rod member can rotate.
Figs. 7A and 7B are views showing only the locking portion in Figs. 5 and 6, respectively.
8A shows a state in which the rod member is locked, FIG. 8B shows a state in which the lock pin is separated from the lock groove, and FIG. 8C shows a state in which the rod member is rotated.
FIG. 9 is a flowchart showing a step in which the opening / closing display unit displays whether a safe opening / closing operation is possible in the high-pressure oxygen chamber according to the present invention.

The research related to the present invention is the result of the research conducted by the Ministry of Commerce, Industry and Energy and the Korea Industrial Technology Development Agency to promote the economic cooperation industry.

(This research was supported by the Ministry of Trade, Industry & Energy (MOTIE) Korea Institute for Advancement of Technology (KIAT) through the Encouragement Program for the Industries of Economic Cooperation Region.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Also, in order to clearly illustrate the present invention in the drawings, portions not related to the present invention are omitted, and the same or similar reference numerals denote the same or similar components.

The objects and effects of the present invention can be understood or clarified naturally by the following description, and the objects and effects of the present invention are not limited only by the following description.

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

1 and 2, the overall structure of a high-pressure oxygen chamber according to the present invention will be described. Hereinafter, the locking device 70 of the high-pressure oxygen chamber according to the present invention and its operation will be described with reference to Figs. 3 to 8. Fig.

Referring to FIGS. 1 and 2, an apparatus for opening and closing a high-pressure oxygen chamber according to an embodiment of the present invention includes a body 10, a door 30, and an opening / closing module. At least a part of the body 10, the door 30, and the opening and closing module may be made of an aluminum alloy, tempered glass, polyurethane, or the like.

The body 10 is basically provided with a space 11 capable of accommodating a patient therein and may be provided in various sizes depending on the number of patients to be accommodated and may be provided in various shapes such as a rectangular parallelepiped and a cylindrical shape have. In the present invention, the body 10 is formed of a cylindrical transparent glass tube, and one end, the other end, and the bottom surface are made of a metal material such as aluminum alloy for robustness. The door part 30 is formed of a metal material and is integrally or separably provided with the door 20 so as to open and close the body part 10 through the hinge movement. An aluminum alloy will be described as an example. The body portion 10 is opened at one end to form an entrance 20. Here, the entrance 20 is an example of a cylindrical opening 20, but may be provided with an entrance 20 having various shapes.

The doorway 20 is hinged to one edge of the doorway 20 and is provided with a door 30 which is opened and closed to the outside of the doorway 20. In detail, in the present invention, since the entrance 20 is formed in a cylindrical shape, the door 20 is provided in the same cylindrical shape as the entrance 20 of the door 30, as an example. Further, the door portion 30 is hingedly connected to one edge of the entrance 20. The door portion 30 is hinged to the outside of the doorway 20 and is provided with a larger diameter than the doorway 20 so as to open and close the doorway 20.

The opening and closing module is configured to fix the door portion 30 which is hinged by the doorway 20 to seal the doorway 20. The doorway portion 30 is fixed and the door portion 30 is moved toward the doorway 20 So that the inside of the body 10 is sealed. Specifically, the opening / closing module is provided at a position different from the one edge of the doorway 20 to which the door portion 30 is hinged. More specifically, the opening / closing module may be formed at the other edge of the entrance 20. Here, the other edge is a position that opposes one edge of the doorway 20 to which the door portion 30 is hinged. At this time, it is most preferable that the opening / closing module is located at a position different from one edge of the hinge connection of the door part 30, but is located on the opposite side (symmetrical) with the one edge. Next, the sphere, connection relation and principle according to each embodiment of the opening and closing module will be described in more detail.

The opening and closing module includes a hinge shaft (100), a rotary member (200), and a rod member (300).

First, a hinge shaft 100 is formed on the other edge of the door 20. The hinge shaft 100 refers to a hinge structure that is hingedly connected to the entrance 20 through a cylindrical rod or hinge connection. Specifically, the hinge shaft 100 is coupled to the other edge of the entrance 20 and rotates, and the rotary member 200 is fastened and hinged. More specifically, the rotary member 200 is coupled to one end and the other end of the hinge shaft 100 by hinge movement. The rotary member 200 is a set of a pair of members, And is hinged to one end and the other end of the shaft 100. Specifically, one end of each of the pair of rotating members 200 is fastened to one end and the other end of the hinge shaft 100, respectively, and hinged. Meanwhile, the rotary member 200 is provided with a rod member 300 at the other end thereof. The rod member 300 is fastened to each of the other ends of the rotary member 200 having a pair of one end and the other end. Accordingly, when the pair of rotary members 200 and the rod member 300 are fastened to each other, they have a "C" shape and are hinged through the hinge shaft 100. When the door 20 is opened or closed by the door 30, the rotary member 200 is hinged about the hinge shaft 100 to fix the door 30 to the door 20.

More specifically, the opening and closing module of the high-pressure oxygen chamber according to the present invention includes a hinge shaft 100, a rotary member 200, a rod member 300, a sealing member 400, and a handle 500.

First, a hinge shaft 100 is formed on the other edge of the door 20. The hinge shaft 100 refers to a hinge structure that is hingedly connected to the entrance 20 through a cylindrical rod or hinge connection. Specifically, the hinge shaft 100 is coupled to the other edge of the entrance 20 and rotates, and the rotary member 200 is fastened and hinged. More specifically, the rotary member 200 is coupled to one end and the other end of the hinge shaft 100 by hinge movement. The rotary member 200 is a set of a pair of members, And is hinged to one end and the other end of the shaft 100. Specifically, one end of each of the pair of rotating members 200 is fastened to one end and the other end of the hinge shaft 100, respectively, and hinged. Meanwhile, the rotary member 200 is provided with a rod member 300 at the other end thereof. The rod member 300 is fastened to each of the other ends of the rotary member 200 having a pair of one end and the other end. Accordingly, when the pair of rotary members 200 and the rod member 300 are fastened to each other, they have a "C" shape and are hinged through the hinge shaft 100. When the door 20 is opened or closed by the door 30, the rotary member 200 is hinged around the hinge shaft 100 to primarily fix the door 30 to the door 20.

Here, the rod member 300 provided in a cylindrical shape is provided so that one end and the other end of the rod member 300 are coupled to the rotating member 200 and can rotate about the center axis of the rod member 300.

Also, the rod member 300 is provided with at least one sealing member 400. In the present invention, two sealing members 400 are provided as shown in the drawings. The sealing member 400 may be provided in a column shape formed on the same axis as the center axis z of the rod member 300. In detail, the sealing member 400 may be provided with a columnar shape having a cross-section of a curved shape having a different radius. More specifically, the sealing member 400 may be provided in a column shape having an egg-shaped cross section.

Therefore, by rotating the sealing member 400 by rotating the rod member 300 with respect to the central axis z of the rod member 300, the door member 30 can be rotated by the rotation of the sealing member 400, 20) direction.

In addition, at least one engagement groove 31 may be formed on the outer surface of the door portion 30 at a position corresponding to the sealing member 400. In detail, the outer surface of the door part 30 may be formed with a corresponding position and a corresponding number of engagement grooves 31 with the sealing member 400. More specifically, the engaging groove 31 is configured to guide the protruded one surface of the closure member 400 into contact with the engaging groove 31 by rotating the closure member 400. More specifically, when the sealing member 400 is positioned in the coupling groove 31, the coupling groove 31 is formed in a shape of a sector having a center on the center axis z of the rod member 300 Grooves. More specifically, when the rod member 300 is positioned in the coupling groove 31 through the hinge movement of the hinge shaft 100, the coupling groove 31 is formed in the center of the central axis z of the rod member 300 Like grooves which are formed in a radial direction. The radius c of the fan shape of the engaging groove 31 is set to be smaller than the small radius a of the sealing member 400 provided in the column shape on the basis of the central axis z of the rod member 300 (B) of the sealing member (400). The radius c of the coupling groove 31 is set to have a radius equal to or larger than the small radius a of the sealing member 400 so as to be easily opened when the user opens the door 20 . The radius c of the coupling groove 31 is a radius of the sealing member 400 so that the door 30 can compress and seal the door 20 when the user closes the door 20 b < / RTI >

In addition, the rod member 300 may further include a rod-like grip portion 500, one end of which is fastened to the rod member 300. The handle 500 can rotate the rod 300 easily by rotating the other end. In addition to the function of easily rotating the rod member 300, the handle 500 can specify the rotational range of the sealing member 400 formed on the rod member 300. In detail, the handle 500 can enable the sealing member 400 to specify an optimal position for pressing and sealing the door 30. More specifically, the handle 500 can be specified through the position of the other end of the handle 500 at an optimum position where the sealing member 400 compresses and seals the door 30. Specifically, the direction having the greatest radius (b) of the sealing member 400 is defined as the protruded surface of the sealing member 400, and the direction of the protruding surface of the sealing member 400 and the direction of the fastening groove 31, The other end of the handle 500 is provided in the length and direction contacting the door 30. For example, when the handle member 500 is moved to rotate the sealing member 400 formed on the rod member 300 and the rod member 300, the protruding surface of the sealing member 400 is moved in the opening / The other end of the handle 500 is moved in a direction perpendicular to the door unit 30 so that the sealing member 400 is not rotated any longer when the door unit 30 is rotated to a position perpendicular to the door unit 20, And has a length and an angle in contact with the outer surface.

Figs. 3 and 4 are enlarged views of a portion of the locking device 70 shown in Figs. 1 and 2. Fig. Fig. 3 shows a state in which the lock pin of the lock device is protruded to lock and seal the door portion. 4 shows a state in which the lock pin 71 is inserted in the closed door of FIG. 3 and the rod member 300 rotates to release the seal of the door part after the seal member 400 rotates, Is opened. ㅤ

The locking device 70 is configured to prevent the rod member 300 from rotating. If the rod member 300 does not rotate, the sealing member 400 does not rotate so that the sealing of the door portion 30 can be maintained. The locking device 70 is shown to be disposed at the lower end of the door part in FIG. 3, but is not limited thereto. The locking device 70 may be a position (for example, the upper end of the door part) that can be connected to one end of the rod member 300.

The lock device 70 is inserted into the lock groove 321 provided at one end 320 of the rod member and protruding in the longitudinal direction (horizontal direction) of the high-pressure oxygen chamber, thereby preventing the rotation of the rod member 300 71).

The lock pin 71 protrudes horizontally, for example, in a piston shape. The lock device 70 projects the lock pin 71 to the internal pressure of the high-pressure oxygen chamber through the pressure transfer pipe P connected to the inside of the high-pressure oxygen chamber. According to the preferred embodiment of the present invention, when the pressure inside the chamber is 0.5 bar or more, the lock pin 71 can automatically protrude horizontally by the pressure. Further, the lock pin 71 can be automatically configured to enter when the pressure inside the chamber is less than 0.5 bar.

According to a preferred embodiment, the lock pin 71 may be configured to gradually protrude due to the pressure inside the chamber, but it may protrude once when a certain pressure (for example, 0.5 bar) is reached, It is preferable that the sensing pin 71 is provided so as to be able to be inserted at one time.

Accordingly, when the pressure of the lock pin 71 is higher than a specific pressure according to the air pressure inside the chamber, the door portion 30 can be automatically closed by the lock pin 71.

In the preferred embodiment of the present invention, the locking device 70 is configured to detect whether or not the locking pin 71 is protruded, and detects a change in the position of the locking pin in the horizontal direction, And a lock pin detection sensor for detecting whether or not it is inserted.

Thus, it is possible to grasp whether or not the lock pin is protruded, and if the protruding state is visually displayed by a display unit described later, there is an advantage that even an inexperienced user can be unlikely to break the lock unit by turning the knob.

As another embodiment of the present invention, the cradling device 70 may further include a sensing pin 73 disposed in parallel with the lock pin 71 in the vertical direction and capable of reciprocating in the horizontal direction.

Since the sensing pin 73 is urged to protrude in the horizontal direction through a spring or the like, the one end of the sensing pin 73 is in contact with the periphery of the cylindrical end 320 of the rod member at all times. It is preferable that one end of the sensing pin 73 protrudes in a round shape or a ball bearing so that the rod member does not interfere with rotation.

The sensing pin 73 may be inserted into a sensing groove 323 to be described later. The sensing pin 73 may be provided with a sensing pin sensor to determine whether the sensing pin is protruded. When one end of the sensing pin 73 is inserted into the sensing groove 323 formed in a part of the circumference of the cylindrical one end 320 as the cylindrical end 320 of the rod member rotates, The position in the horizontal direction is changed and it can be detected through the sensing pin detection sensor.

Since the sensing pin 73 and the locking pin 71 and the sensing groove 323 and the locking groove 321 are located in the vertical direction with respect to each other, the fact that the sensing pin 73 is inserted into the sensing groove 323 It can be seen that the rod member has rotated to a position where the lock pin 71 protrudes and can be inserted into the lock groove 321. [

The locking device of the high-pressure oxygen chamber according to the present invention includes a locking pin detection sensor and a sensing pin detection sensor located inside the locking device. In order to transmit information on whether or not the locking pin and the sensing pin protrude, And a line (L).

5 is a cross-sectional view and a perspective view of a high-pressure oxygen chamber in a closed state in which the lock pin is inserted, and FIG. 6 is a sectional view showing a state in which the lock pin is detached and the rod member is rotatable. However, in Fig. 6, the door portion 30 is not yet opened.

5, a rod-shaped end 320 is provided at the lower end of the rod member, and a lock groove 321 and a detection groove 323 are provided in the cylindrical end 320 in a vertical direction. do.

Since the lock groove 321 is configured to prevent the rod member 300 from rotating due to the insertion of the lock pin 71 as described above, it is preferable that the lock groove 321 is relatively deeply engaged. On the other hand, the sensing groove 73 moves in the horizontal direction of the sensing pin 73 so that it can be grasped by the sensing pin sensor and is not interfered with the rotation of the rod member.

6 shows that the lock pin 71 is disengaged from the lock groove 321 and the rod member 300 is rotated so that the detection pin 73 is slightly moved (arrowed) in the left direction in the drawing.

Figs. 7A and 7B are views showing only the locking portion in Figs. 5 and 6, respectively. Fig. 8 is a view sequentially showing a state in which the rod member is locked (Fig. 8A), a state in which the lock pin is detached from the lock groove (Fig. 8B), and a state in which the rod member is rotated (Fig.

ㅤ

Referring back to FIG. 1, the high-pressure oxygen chamber according to the present invention includes an internal pressure regulator 91 for controlling the pressure in the chamber by an external user and an internal pressure indicator 93 for displaying the current chamber pressure in real time, And an internal pressure sensing sensor for sensing the internal pressure in real time. According to a preferred embodiment, the internal pressure regulating part 91 may be provided in a rotatable valve shape, and the internal pressure indicating part 93 may be configured to display the internal pressure with a scale or a numerical value.

According to a preferred embodiment of the present invention, the high-pressure oxygen chamber according to the present invention further includes an opening / closing display unit (80, 82) indicating whether the door unit can be opened or closed. The open / close display unit visually displays whether or not it is safe to open or close in the present state visually, and it is possible to display whether or not it can be opened or closed with an intuitive display such as the red lamp 81 and the blue lamp 82.

It is an object of the present invention to indicate whether or not a door can be opened or closed intuitively so that even an inexperienced user can safely open the door part.

As described above, since the lock pin automatically disengages when a certain internal pressure falls below a pressure (for example, 0.5 bar), the lock pin is physically rotated by rotating the rod member 300 to open the door can do. However, in this case, there is a pressure of 0.5 bar inside, so when the door is opened, the pressure may be leaked and the user may be surprised or accidents may occur.

In order to solve this problem, the opening / closing display unit does not indicate that the first information that the lock pin (71) has disengaged from the lock groove (321) is received from the lock pin sensor, It is indicated that safe opening and closing is possible only when the second information indicating that the pressure inside the chamber obtained is less than a certain pressure (for example, 0.05 bar).

With this configuration, even in a high pressure (0.5 bar) in an emergency, the opening can be opened quickly without waiting for the rest of the pressure to come off, but it is intuitively openable for a completely safe pressure (0.05 bar) Even if the user is inexperienced.

In yet another embodiment, the indicator of openable / closable capability may indicate that if the pressure is less than the higher pressure (0.5 bar) and greater than the safe opening and closing pressure (0.05 bar), it is not completely safe, (Emergency opening / closing display), and the like.

FIG. 9 is a flowchart showing a step in which the opening / closing display unit displays whether or not the high-pressure oxygen chamber can be safely opened and closed according to the present invention.

A method of indicating whether or not a high-pressure oxygen chamber can be opened or closed according to the present invention comprises the steps of: measuring a pressure of an internal space through an internal pressure sensor; Closing the lock pin, which is capable of reciprocating in the horizontal direction, from the lock groove automatically, transmitting to the opening / closing display the first information that the lock pin has disengaged from the lock groove from the lock pin detection sensor, And when the second information that the pressure of the internal space is less than 0.05 bar is received, the opening / closing display unit visually displays (safe opening / closing display) that the opening / closing of the opening / closing is possible.

In addition, when the lock pin is released, if it is less than a high pressure (0.5 bar) and greater than a safety openable pressure (0.05 bar), an emergency Step < / RTI >

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. The appended claims are to be considered as falling within the scope of the appended claims.

Accordingly, it is to be understood that the present invention is not limited to the above-described embodiments and the accompanying drawings, and various changes, substitutions, and alterations can be made by those skilled in the art without departing from the scope of the present invention.

Claims (2)

There is provided a method for indicating whether or not a high-pressure oxygen chamber having a locking device for fixing rotation of a rod member (300) for opening and closing a door part (30)
Measuring the pressure of the inner space of the high-pressure oxygen chamber;
When the pressure in the inner space of the high-pressure oxygen chamber is less than 0.5 bar, the horizontally reciprocable locking pin inserted in the locking groove of the rod member automatically releases from the locking groove;
Transmitting the first information indicating that the lock pin has disengaged from the lock groove to the opening / closing display unit from the lock pin detection sensor;
And visually indicating that the opening and closing display unit is openable and closable when the first information is received and the second information that the pressure of the internal space is less than 0.05 bar is received, How to display whether. The method according to claim 1,
The open /
Characterized by further comprising the step of making an emergency opening and closing indication that when the pressure of the inner space is less than 0.5 bar and not less than 0.05 bar after the step of detaching the lock pin from the lock groove, Pressure oxygen chamber is opened or closed.

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