Portable oxygen supply cartridge

Abstract

The application provides a portable oxygen supply box, which comprises a shell, a plurality of oxygen cylinders and a group of liftable brackets arranged in the shell, the plurality of oxygen cylinders are arranged on the brackets, a lifting mechanism connected with the brackets is arranged on the shell to drive the brackets to ascend, a crossbar is arranged in the shell, a mounting rack is sleeved on the crossbar along the axis of the crossbar, a connecting block is arranged at one end of the mounting rack, a connecting assembly communicated with the oxygen cylinders is arranged on the connecting block, a mask communicated with the pipeline is connected with the connecting assembly, a propelling mechanism connected with the mounting rack is further arranged in the shell, and the uppermost group of oxygen cylinders is moved out of the shell through the propelling mechanism during the sliding process of the mounting rack. The oxygen supply box can quickly complete the replacement of the oxygen cylinders, improves the oxygen supply efficiency during outdoor task execution, and the oxygen cylinders can be discarded after being moved out, so that the weight is reduced and the personnel use is facilitated.

Description

Technical Field

[0001] This invention relates to the field of outdoor oxygen supply technology, specifically to a portable oxygen supply box. Background Technology

[0002] Because the natural geography and climate characteristics of plateau regions are different from those of plains, people on plateaus experience some physical factors that are different from those on plains, such as low air pressure, lack of oxygen, and cold. The most significant of these is the low-oxygen environment. When performing high-intensity tasks on plateaus, it is necessary to carry portable oxygen supply equipment to prevent sudden situations of high-altitude hypoxia.

[0003] For example, Chinese invention patent application number 202010214066.6 provides a dual-purpose portable oxygen backpack. This backpack has a storage compartment containing an oxygen bag, which is connected to an oxygen tubing. This allows the user to receive oxygen in real-time, facilitating use in low-oxygen environments. However, this patent's technical solution suffers from the same problem as traditional outdoor oxygen supply equipment: the oxygen bag in this portable oxygen backpack is a separate, complete cavity. This makes it inconvenient to quickly replace or replenish the oxygen bag or cylinder when the oxygen is depleted. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a portable oxygen supply box to solve the technical problem mentioned in the background art: the inconvenience of quickly replacing oxygen bags or cylinders during the use of traditional outdoor oxygen supply equipment.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a portable oxygen supply box, comprising:

[0006] The housing contains multiple sets of oxygen cylinders and a liftable bracket, with the multiple sets of oxygen cylinders mounted on the bracket.

[0007] A lifting mechanism is mounted on the housing and connected to the bracket to drive the bracket to rise;

[0008] A crossbar is disposed within the housing, and a mounting bracket is slidably fitted onto the crossbar along its axis. One end of the mounting bracket is provided with a connecting block, and the connecting block is provided with a connecting assembly communicating with the oxygen cylinder. The connecting assembly is connected to a face mask with a connecting pipe.

[0009] A propulsion mechanism is disposed inside the housing and connected to the mounting bracket. During the sliding process, the mounting bracket pushes the uppermost group of oxygen cylinders out of the housing via the propulsion mechanism.

[0010] In a preferred embodiment, a limiting protrusion is provided inside the housing, and multiple sets of oxygen cylinders are disposed on one side of the limiting protrusion. A gap is provided between one end of the limiting protrusion and the housing for the oxygen cylinders to be moved out.

[0011] In a preferred embodiment, a hinged baffle is provided at the opening on one side of the housing. The baffle blocks the gap between one end of the limiting protrusion and the housing. The baffle abuts against one of the oxygen cylinders. A torsion spring is provided at the hinge point between the baffle and the housing.

[0012] In a preferred embodiment, the lifting mechanism includes:

[0013] Two sets of pulleys are provided, and both of them are rotatably mounted on the housing;

[0014] A drive belt is fitted onto two sets of pulleys, and a drive column is provided on the drive belt;

[0015] A constant force spring, one end of which is fixedly connected to the housing, and the other end of which is connected to the pulley; and

[0016] A connecting frame is provided on the bracket, and a sliding groove is provided on the connecting frame. The driving column is slidably engaged in the sliding groove along the extension direction of the sliding groove.

[0017] In a preferred embodiment, the connection component includes:

[0018] A pressure reducing valve is installed at the gas supply end of the oxygen cylinder;

[0019] An air outlet is provided at the air supply end of the oxygen cylinder, and an air vent is provided on the air outlet.

[0020] A baffle plate is slidably disposed within the air outlet cylinder, a first spring is disposed between the baffle plate and the air outlet cylinder, and a contact block is disposed on the baffle plate to trigger the opening of the pressure reducing valve; and

[0021] A ventilation column is disposed on the connecting block and communicates with the mask. A ventilation groove is provided on the ventilation column. The ventilation column passes through the air outlet and abuts against the baffle.

[0022] In a preferred embodiment, the connecting block is provided with a first pull ring.

[0023] In a preferred embodiment, the propulsion mechanism includes:

[0024] A pusher is slidably disposed within the housing in a direction perpendicular to the housing. The pusher abuts against one of the sets of oxygen cylinders. The pusher is provided with a guide groove, which is formed by a set of flat grooves and two sets of inclined grooves connected together.

[0025] A guide post is disposed at the other end of the mounting bracket and is engaged within the guide groove; and

[0026] A tension spring, one end of which is connected to the mounting bracket and the other end of which is connected to the housing.

[0027] In a preferred embodiment, a positioning track is provided inside the housing, and a positioning groove is provided on the pusher, which is slidably engaged on the positioning track through the positioning groove.

[0028] In a preferred embodiment, the housing is further provided with a fixing component for fixing the position of the mounting bracket after it has been moved.

[0029] In a preferred embodiment, the fixing component includes:

[0030] The mounting rod is slidably inserted into the housing along its axis. One end of the mounting rod is provided with a second pull ring, and the other end is provided with a clip. One side of the clip is provided with an inclined surface.

[0031] A second spring is disposed between the card holder and the housing; and

[0032] A fixing post is provided on the mounting bracket, and when the mounting bracket is slid to its limit position, the fixing post can be inserted into the bracket through the inclined surface.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. This oxygen supply box can be carried on the back for outdoor oxygen supply, facilitating high-altitude missions. Oxygen is drawn from the cylinder via a mask and connecting assembly. When the cylinder is depleted, the connecting block can be pulled to detach it from the cylinder, disconnecting it. Pulling the connecting block causes the mounting frame to slide along the axis of the crossbar. During this sliding motion, the mounting frame uses a pushing mechanism to remove the top set of oxygen cylinders from the housing. After resetting, the mounting frame, under the action of the lifting mechanism and bracket, controls the oxygen cylinders inside the housing to rise, reconnecting the connecting assembly to the top set of oxygen cylinders. This allows for quick cylinder replacement, improving oxygen supply efficiency during outdoor missions. Furthermore, after the cylinders are removed, the user can discard the empty cylinders to reduce weight.

[0035] 2. In use, the oxygen supply box can be moved by pulling the connecting block with the first pull ring, causing the mounting bracket to slide. During this movement, the mounting bracket moves the guide column. As the guide column slides within the flat groove of the guide slot, it disengages the connecting component on the connecting block from the oxygen cylinder. Pulling the first pull ring further causes the guide column to slide within one set of inclined grooves in the guide slot. The interaction between the inclined grooves and the guide column causes the pusher to slide along the positioning track, pushing the oxygen cylinder out through the gap between the limiting protrusion and the housing, thus completing the replacement of the oxygen cylinder. Releasing the first pull ring allows the connecting block to reset under the action of the tension spring, completing the connection with the oxygen cylinder. After the oxygen cylinder is used up, pulling the first pull ring again causes the guide column to slide within another set of inclined grooves, causing the pusher to retract. The position of the connecting bracket is then fixed by the fixing component, facilitating the loading of multiple oxygen cylinders and further improving the convenience of using the oxygen supply box. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0037] Figure 1 A three-dimensional structural schematic diagram of a portable oxygen supply box provided by the present invention;

[0038] Figure 2 This is a schematic diagram of the structure of the shell in a portable oxygen supply box according to the present invention;

[0039] Figure 3 for Figure 2 Enlarged view of region a in the middle;

[0040] Figure 4 This is a schematic diagram of the structure of an oxygen cylinder in a portable oxygen supply box according to the present invention;

[0041] Figure 5 This is a schematic diagram of the propulsion mechanism in a portable oxygen supply box according to the present invention;

[0042] Figure 6 for Figure 5 A schematic diagram of the disassembled structure;

[0043] Figure 7 This is a schematic diagram of the lifting mechanism in a portable oxygen supply box according to the present invention.

[0044] Figure label:

[0045] 101. Housing; 102. Limiting protrusion; 103. Crossbar; 104. Positioning rail; 105. Mounting rod; 106. Second pull ring; 107. Card holder; 108. Second spring;

[0046] 201. Oxygen cylinder; 202. Pressure reducing valve; 203. Gas outlet; 204. First spring; 205. Baffle plate; 206. Contact block;

[0047] 301. Mounting bracket; 302. Connecting block; 303. Ventilation column; 304. First pull ring; 305. Face mask; 306. Tension spring; 307. Guide column; 308. Fixing column;

[0048] 401. Push frame; 402. Guide groove; 403. Positioning groove;

[0049] 501. Baffle; 502. Torsion spring;

[0050] 601. Bracket; 602. Connecting frame; 603. Slide groove; 604. Pulley; 605. Constant force spring; 606. Drive belt; 607. Drive column. Detailed Implementation

[0051] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0052] Example:

[0053] like Figure 1 , 2 As shown in Figure 7, this invention provides a portable oxygen supply box, which can be designed in different sizes to facilitate use by carrying it on the back or around the waist, adapting to different usage scenarios. The oxygen supply box includes a housing 101, within which multiple oxygen cylinders 201 and a liftable bracket 601 are disposed. The multiple oxygen cylinders 201 are mounted on the bracket 601. A lifting mechanism connected to the bracket 601 is provided on the housing 101, driving the bracket 601 to rise. The lifting mechanism includes two sets of pulleys 604 rotatably mounted on the housing 101. The two sets of pulleys 604 are connected by a transmission belt 606. A drive column 607 is mounted on the transmission belt 606. A constant force spring 605 is fixedly connected to the pulleys 604. One end of the constant force spring 605 is fixedly connected to the housing 101. A connecting frame 602 is mounted on the bracket 601. A sliding groove 603 is provided on the connecting frame 602. The drive column 607 is slidably engaged in the sliding groove 603 along the extension direction of the sliding groove 603.

[0054] When in use, the oxygen supply box can stack multiple oxygen cylinders 201 inside the housing 101. A limiting protrusion 102 is provided inside the housing 101. Multiple oxygen cylinders 201 are all located on one side of the limiting protrusion 102. A gap is provided between one end of the limiting protrusion 102 and the housing 101 to allow the oxygen cylinders 201 to move out. Only the topmost set of oxygen cylinders 201 can be moved out of the housing 101. The lower sets of oxygen cylinders 201 are blocked by the limiting protrusion 102 and cannot move.

[0055] During the placement of oxygen cylinders 201, the oxygen cylinders 201 are inserted through the gap between the limiting protrusion 102 and the housing 101. After the oxygen cylinders 201 are inserted, the bracket 601 moves downward. During the movement, the bracket 601 drives the transmission belt 606 through the slide groove 603. During the movement, the transmission belt 606 drives the constant force spring 605 to deform through the pulley 604. After the top set of oxygen cylinders 201 is removed, the constant force spring 605 drives the pulley 604 to move and controls the transmission belt 606 to reset, thereby driving the bracket 601 to rise and pushing the oxygen cylinders 201 below upward.

[0056] like Figure 1 , 6 As shown, in this embodiment, a hinged baffle 501 is provided at the opening on one side of the housing 101. The baffle 501 blocks the gap between one end of the limiting protrusion 102 and the housing 101. The baffle 501 abuts against one of the oxygen cylinders 201, and a torsion spring 502 is provided at the hinge point between the baffle 501 and the housing 101. By providing the baffle 501, the uppermost set of oxygen cylinders 201 can be effectively prevented from moving out of the housing 101 during use, and the oxygen cylinders 201 can be placed back into the housing 101 after the baffle 501 is moved aside.

[0057] like Figure 2 , 4As shown in Figure 5, in this embodiment, a crossbar 103 is provided inside the housing 101, and a mounting bracket 301 is slidably sleeved on the crossbar 103 along its axis. A connecting block 302 is provided at one end of the mounting bracket 301, and a connecting component communicating with the oxygen cylinder 201 is provided on the connecting block 302. A mask 305 communicating through a pipe is connected to the connecting component, and a first pull ring 304 is provided on the connecting block 302. The connecting assembly includes a pressure reducing valve 202 and an outlet cylinder 203 disposed at the gas supply end of the oxygen cylinder 201. The outlet cylinder 203 has a ventilation groove. A baffle 205 is slidably disposed inside the outlet cylinder 203. A first spring 204 is disposed between the baffle 205 and the outlet cylinder 203. A contact block 206 is disposed on the baffle 205 to trigger the opening of the pressure reducing valve 202. A ventilation column 303 communicating with the mask 305 is disposed on the connecting block 302. The ventilation column 303 also has a ventilation groove. The ventilation column 303 passes through the outlet cylinder 203 and abuts against the baffle 205.

[0058] The controllable mounting bracket 301 slides laterally along the axis of the crossbar 103, causing the connecting block 302 to move. During this movement, the connecting block 302 drives the ventilation column 303 to insert into the supply end of the oxygen cylinder 201 and pushes the baffle 205 to move, compressing the first spring 204. This causes the contact block 206 on the baffle 205 to trigger the pressure reducing valve 202 to open, and the ventilation slots on the outlet cylinder 203 and the ventilation column 303 to align, allowing oxygen to be supplied through the outlet cylinder 203 and the ventilation slots on the ventilation column 303. Pulling the first pull ring 304 causes the connecting block 302 to move, disengaging the ventilation column 303 from the outlet cylinder 203. Under the reset capability of the first spring 204, the baffle 205 is reset to seal the supply end of the oxygen cylinder 201.

[0059] like Figure 2 , 5 As shown in Figure 6, in this embodiment, a propulsion mechanism connected to the mounting bracket 301 is provided inside the housing 101. During the sliding process, the mounting bracket 301 pushes the uppermost set of oxygen cylinders 201 out of the housing 101 through the propulsion mechanism. The propulsion mechanism includes a pusher 401, which is slidably disposed inside the housing 101 in a direction perpendicular to the housing 101. The pusher 401 abuts against one of the sets of oxygen cylinders 201. A guide groove 402 is provided on the pusher 401, which is formed by a set of flat grooves and two sets of inclined grooves. A guide post 307 is provided at the other end of the mounting bracket 301. The guide post 307 is engaged in the guide groove 402. The mounting bracket 301 is connected to the housing 101 by a tension spring 306.

[0060] Under the action of the tension spring 306, the mounting bracket 301 can slide along the crossbar 103, thereby driving the connecting block 302 to move so that the ventilation column 303 can be inserted into the air outlet cylinder 203. By pulling the first pull ring 304, the connecting block 302 can be moved, thereby driving the guide column 307 to move. Since the housing 101 is provided with a positioning track 104 and the pusher 401 is provided with a positioning groove 403, the pusher 401 is slidably locked on the positioning track 104 through the positioning groove 403 and can only move linearly along the positioning track 104. In the initial stage of movement, the guide column 307 slides in the flat groove on the guide groove 402, thereby driving only the connecting block 302 to move so that the ventilation column 303 can be separated from the air outlet cylinder 203. Continuing to pull the first pull ring 304 can drive the guide column 307 to move in one of the inclined grooves, thereby driving the pusher 401 to move linearly along the positioning track 104 through the inclined grooves, so as to move the uppermost set of oxygen cylinders 201 out of the housing 101. After releasing the first pull ring 304, the oxygen cylinder 201 below will move upward under the action of the lifting mechanism, and the ventilation column 303 will be inserted into the air outlet 203 under the action of the tension spring 306, thereby completing the quick replacement of the oxygen cylinder 201.

[0061] like Figure 2 , 3 As shown in Figures 5 and 6, in this embodiment, the housing 101 is further provided with a fixing component for fixing the position of the mounting bracket 301 after it has moved. The fixing component includes a mounting rod 105 that is slidably inserted through the housing 101 along its axis. One end of the mounting rod 105 is provided with a second pull ring 106, and the other end is provided with a clip 107. One side of the clip 107 is provided with an inclined surface. A second spring 108 is provided between the clip 107 and the housing 101. The mounting bracket 301 is provided with a fixing post 308. When the mounting bracket 301 slides to its limit position, the fixing post 308 can be inserted into the clip 107 through the inclined surface.

[0062] After all oxygen cylinders 201 have been used, pulling the first pull ring 304 moves the guide post 307 within another set of inclined slots. This causes the pusher 401 to push out the last remaining set of oxygen cylinders 201 and retract, while the fixing post 308 pushes the bracket 107 upwards along the mounting rod 105 via the inclined surface until the fixing post 308 engages with the bracket 107. The bracket 107, in conjunction with the second spring 108, secures the fixed post 308 and the mounting bracket 301 to their original positions. After all oxygen cylinders 201 have been placed, pulling the second pull ring 106 disengages the bracket 107 from the fixing post 308. The tension spring 306 then controls the mounting bracket 301 to reset, making it ready for use.

[0063] Specific usage and beneficial effects of the present invention:

[0064] This oxygen supply box can be carried on the back for outdoor oxygen supply, facilitating high-altitude missions. During use, the ventilation column 303 passes through the inlet / outlet cylinder 203, aligning the ventilation slots for oxygen supply. Oxygen is drawn from the oxygen cylinder 201 through the mask 305. When the oxygen in the cylinder 201 is depleted, the connecting block 302 can be pulled to detach it from the cylinder 201, releasing the connection. Pulling the connecting block 302 also causes the mounting bracket 301 to slide along the axis of the crossbar 103. During this sliding process, the mounting bracket 301, via a propulsion mechanism, moves the uppermost set of... After the oxygen cylinder 201 is removed from the housing 101, the mounting bracket 301, after resetting, controls the movement of the transmission belt 606 under the action of the constant force spring 605. During the movement, the transmission belt 606 drives the bracket 601 to rise through the cooperation of the drive column 607 and the slide 603, so that the oxygen cylinder 201 inside the housing 101 rises and the connecting component is reconnected to the uppermost set of oxygen cylinders 201, which can quickly complete the replacement of the oxygen cylinder 201, improving the oxygen supply efficiency when performing outdoor tasks. At the same time, after the oxygen cylinder 201 is removed, the user can throw away the empty oxygen cylinder 201 to reduce the load.

[0065] When in use, the oxygen supply box can be moved by pulling the connecting block 302 through the first pull ring 304, which will cause the mounting bracket 301 to slide. During the movement of the mounting bracket 301, the guide column 307 will move. When the guide column 307 slides in the flat groove in the guide groove 402, it will cause the connecting component on the connecting block 302 to disengage from the oxygen cylinder 201. Continuing to pull the first pull ring 304 will cause the guide column 307 to slide in one of the inclined grooves in the guide groove 402. Through the cooperation between the inclined groove and the guide column 307, the pusher 401 will slide along the positioning track 104 to push the oxygen cylinder 201 out through the gap between the limiting protrusion 102 and the housing 101, thus completing the replacement of the oxygen cylinder 201. Releasing the first pull ring 304 will allow the connecting block 302 to reset under the action of the tension spring 306, thus completing the connection with the oxygen cylinder 201. Furthermore, after the oxygen cylinder 201 is used up, the first pull ring 304 can be pulled to make the guide post 307 slide in another set of inclined grooves, so that the pusher 401 is retracted, and the position of the connecting frame 602 is fixed by the cooperation of the second spring 108 and the card holder 107, which facilitates the filling of multiple oxygen cylinders 201 and further improves the convenience of using the oxygen supply box.

[0066] The foregoing has shown and described the basic principles and main features of the present invention and its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments.

Claims

1. A portable oxygen supply box, characterized in that, Including: The housing (101) contains multiple sets of oxygen cylinders (201) and a set of liftable brackets (601), with the multiple sets of oxygen cylinders (201) mounted on the brackets (601). A lifting mechanism is provided on the housing (101) and connected to the bracket (601) to drive the bracket (601) to rise; A crossbar (103) is disposed within the housing (101). A mounting bracket (301) is slidably sleeved on the crossbar (103) along its axis. A connecting block (302) is provided at one end of the mounting bracket (301). A connecting component communicating with the oxygen cylinder (201) is provided on the connecting block (302). The connecting component is connected to a mask (305) with a connecting pipe. A propulsion mechanism is disposed inside the housing (101) and connected to the mounting bracket (301). During the sliding process, the mounting bracket (301) pushes the uppermost set of oxygen cylinders (201) out of the housing (101) through the propulsion mechanism. The propulsion mechanism includes: A pusher (401) is slidably disposed within the housing (101) in a direction perpendicular to the housing (101). The pusher (401) abuts against one of the oxygen cylinders (201). A guide groove (402) is provided on the pusher (401). The guide groove (402) is formed by a set of flat grooves and two sets of inclined grooves connected together. A guide post (307) is disposed at the other end of the mounting bracket (301) and is engaged within the guide groove (402); and A tension spring (306) is connected at one end to the mounting bracket (301) and at the other end to the housing (101); The housing (101) is provided with a positioning track (104), and the pusher (401) is provided with a positioning groove (403). The pusher (401) is slidably locked on the positioning track (104) through the positioning groove (403). In the initial stage of movement, the guide column (307) slides in the flat groove on the guide groove (402), causing the connecting component on the connecting block (302) to detach from the oxygen cylinder (201). The guide column (307) continues to move in one of the inclined grooves. Through the cooperation between the inclined groove and the guide column (307), the pusher (401) slides along the positioning track (104) and pushes out the oxygen cylinder (201).

2. A portable oxygen supply box according to claim 1, characterized in that: The housing (101) is provided with a limiting protrusion (102), and multiple oxygen cylinders (201) are all located on one side of the limiting protrusion (102). A gap is provided between one end of the limiting protrusion (102) and the housing (101) for the oxygen cylinders (201) to move out.

3. A portable oxygen supply box according to claim 2, characterized in that: A hinged baffle (501) is provided at the opening on one side of the housing (101). The baffle (501) blocks the gap between one end of the limiting protrusion (102) and the housing (101). The baffle (501) abuts against one of the oxygen cylinders (201). A torsion spring (502) is provided at the hinge point between the baffle (501) and the housing (101).

4. A portable oxygen supply box according to claim 1, characterized in that, The lifting mechanism includes: Two sets of pulleys (604) are provided, and both are rotatably mounted on the housing (101); A drive belt (606) is fitted on two sets of pulleys (604), and a drive column (607) is provided on the drive belt (606). A constant force spring (605), one end of which is fixedly connected to the housing (101), and the other end of which is connected to the pulley (604); and A connecting frame (602) is provided on the bracket (601). A sliding groove (603) is provided on the connecting frame (602). The driving column (607) is slidably engaged in the sliding groove (603) along the extension direction of the sliding groove (603).

5. A portable oxygen supply box according to claim 1, characterized in that, The connection component includes: A pressure reducing valve (202) is installed at the gas supply end of the oxygen cylinder (201); An air outlet (203) is provided at the air supply end of the oxygen cylinder (201), and an air vent is provided on the air outlet (203); A baffle (205) is slidably disposed within the air outlet (203), a first spring (204) is disposed between the baffle (205) and the air outlet (203), and a contact (206) is disposed on the baffle (205) to trigger the opening of the pressure reducing valve (202); and A ventilation column (303) is disposed on the connecting block (302) and communicates with the mask (305). A ventilation groove is provided on the ventilation column (303). The ventilation column (303) passes through the air outlet (203) and abuts against the baffle (205).

6. A portable oxygen supply box according to claim 1, characterized in that: The connecting block (302) is provided with a first pull ring (304).

7. A portable oxygen supply box according to claim 1, characterized in that: The housing (101) is also provided with a fixing component for fixing the position of the mounting bracket (301) after it has been moved.

8. A portable oxygen supply box according to claim 7, characterized in that, The fixing component includes: The mounting rod (105) is slidably inserted into the housing (101) along its axis. One end of the mounting rod (105) is provided with a second pull ring (106), and the other end is provided with a bracket (107). One side of the bracket (107) is provided with an inclined surface. A second spring (108) is disposed between the card holder (107) and the housing (101); and A fixing post (308) is provided on the mounting bracket (301). When the mounting bracket (301) slides to its limit position, the fixing post (308) can be inserted into the bracket (107) through the inclined surface.

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