Pneumatic door opener

Abstract

The utility model relates to a pneumatic door opener. A mounting cylinder; the valve rod assembly is arranged in the mounting cylinder and divides the interior of the mounting cylinder into a high-pressure gas bin and an impact bin; one end of the impact piece is arranged in the impact bin of the mounting barrel, the other end of the impact piece extends out of the mounting barrel and is used for opening the door, and the driving assembly is configured to be in linkage with the valve rod assembly, so that compressed gas in the high-pressure gas bin is decompressed into the impact bin, and the impact piece is driven to open the door. High-pressure gas of a fire-fighting air expiration system is used as a power source, that is, an additional power source is not needed, and the device can work only by means of the high-pressure gas provided by the fire-fighting air expiration system, so that the complexity of the device and dependence on external conditions are greatly reduced, and the portability and applicability of the device are improved; and the energy of the high-pressure gas can be quickly converted into kinetic energy of the impact piece through the pneumatic assembly, so that quick and strong impact on the door lock or the door body is realized, and the door breaking speed is remarkably increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of door breaking operation, in particular to a pneumatic door breaker. BACKGROUND

[0002] In emergency rescue, fire fighting operation and specific military operations, it is crucial to quickly enter a closed space. Traditional door breaking methods, such as using crowbars, axes or explosives, have the disadvantages of complex operation, long time consumption, insufficient safety, and potential damage to the surrounding environment. In particular, in scenarios requiring rapid entry into a fire scene, rescuing trapped personnel or executing emergency tasks, these traditional methods often cannot meet the requirements of fast, efficient and safe door breaking.

[0003] The fire air breathing system (i.e., air breathing apparatus) is an important equipment for emergency personnel such as firefighters to protect their breathing in dangerous environments. This system is usually equipped with a high-pressure gas cylinder, which can provide a continuous and stable gas source. However, in the prior art, the gas source of the fire air breathing system is mainly used to provide breathing air for emergency personnel, and its potential kinetic energy utilization value has not been fully explored.

[0004] To address the above problems, some devices have appeared on the market that attempt to use compressed gas to break doors. However, these devices often have complex structures and cumbersome operations, and rely on external power sources such as electricity or compressed air tanks, which to some extent limits their portability and range of application. In addition, these devices also have certain deficiencies in door breaking effect, door breaking speed and safety.

[0005] Therefore, the present application aims to provide a pneumatic door breaker that can quickly break doors, has good door breaking effect and only needs to rely on the fire air breathing system to provide kinetic energy, in order to meet the actual needs of emergency rescue and fire fighting operations. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a pneumatic door breaker that can quickly break doors, has good door breaking effect and only needs to rely on the fire air breathing system to provide kinetic energy, in order to address the shortcomings of the prior art.

[0007] The technical problem to be solved by the present application is solved by the following technical solution, a pneumatic door breaker comprising:

[0008] a mounting cylinder;

[0009] a valve rod assembly placed in the mounting cylinder, which divides the mounting cylinder into a high-pressure gas chamber and a striking chamber;

[0010] a striking member, one end of which is placed in the striking chamber of the mounting cylinder and the other end of which extends outside the mounting cylinder and is used for breaking doors;

[0011] A driving assembly is configured to be linked with the valve rod assembly, so as to cause the compressed gas in the high-pressure gas chamber to be released into the impact chamber and drive the impact piece to break the door.

[0012] The technical problem to be solved by the present application can also be solved by the following technical scheme, the above-mentioned pneumatic door breaker, the valve rod assembly comprises;

[0013] An intermediate fixed plate is arranged in the middle part of the mounting cylinder, and the space between the two ends of the mounting cylinder and the intermediate fixed plate forms the high-pressure gas chamber and the impact chamber in sequence, and a gas groove for gas flow is formed in the middle part of the intermediate fixed plate;

[0014] A valve rod and a valve core, one end of the valve rod is arranged in the high-pressure gas chamber, the other end of the valve rod extends into the impact chamber through the gas groove, and the valve core is fixed on the outer circumferential surface of the middle part of the valve rod to selectively block the gas groove;

[0015] A centering fixed assembly for supporting the valve core on the valve rod to keep the gas groove blocked is arranged in the high-pressure gas chamber.

[0016] The technical problem to be solved by the present application can also be solved by the following technical scheme, the above-mentioned pneumatic door breaker, the valve rod assembly comprises;

[0017] A plurality of support pieces are arranged in the high-pressure gas chamber, and the support pieces have centering holes for the valve rod to pass through, and the outer walls of the support pieces abut against the inner circumferential surface of the high-pressure gas chamber of the mounting cylinder, so that the axis of the centering hole is always on the axis of the mounting cylinder;

[0018] A support screw is arranged, one end of the support screw is fixed on the support piece, and the other end of the support screw is opposite to the side wall of the mounting cylinder;

[0019] An elastic element I is sleeved on the outer circumferential surface of the valve rod, one end of the elastic element I abuts against the side wall of the valve core, and the other end of the elastic element I abuts against the side wall of the support piece, so that the valve core blocks the gas groove.

[0020] The technical problem to be solved by the present application can also be solved by the following technical scheme, the above-mentioned pneumatic door breaker, the valve rod assembly comprises;

[0021] A brake piston is arranged in the impact chamber, one side of the brake piston is opposite to the end of the valve rod, and the other side of the brake piston is integrated with the impact piece;

[0022] A brake chamber is fixed on the intermediate fixed plate and has a cavity inside, one end of the brake chamber is a control end, and the other end of the brake chamber is an execution end;

[0023] A distributor is fixed at the control end of the brake chamber, a gas passage is formed in the distributor, the gas inlet end of the gas passage is communicated with the high-pressure gas chamber, and the gas outlet end of the gas passage is communicated with the cavity of the brake chamber and the impact chamber, respectively.

[0024] valve I, which is installed on the distributor and at the part where the air channel communicates to the impact chamber, to control the on-off of the high-pressure gas from the air channel into the impact chamber;

[0025] valve II, which is installed in the cavity of the brake chamber, to control the on-off of the high-pressure gas from the air channel into the cavity;

[0026] valve III, which is installed outside the impact chamber of the mounting cylinder, to deflate the impact chamber;

[0027] an unlocking mechanism, which is arranged between the mounting cylinder and the impact piece.

[0028] The technical problem to be solved by the present application can also be realized by the following technical scheme, the above-mentioned pneumatic door breaker, the impact piece comprises;

[0029] an impact rod, one end of the impact rod is fixed on the side surface of the brake piston, and the other end of the impact rod extends to the outside of the mounting cylinder, and a striking head for striking the door is fixed on the outer circumferential surface of the impact rod extending to the outside of the mounting cylinder;

[0030] a resilient element II, which is sleeved on the outer circumferential surface of the impact rod, one end of the resilient element II abuts against the end surface of the brake piston, and the other end of the resilient element II abuts against the inner wall of the impact chamber of the mounting cylinder.

[0031] The technical problem to be solved by the present application can also be realized by the following technical scheme, the above-mentioned pneumatic door breaker, further comprising a front fixed plate and a rear fixed plate;

[0032] The front fixed plate is fixed on the end of the mounting cylinder close to the high-pressure gas chamber, and a high-pressure pipe interface communicating with the inside of the high-pressure gas chamber is installed on the front fixed plate;

[0033] The rear fixed plate is fixed on the end of the mounting cylinder close to the impact chamber.

[0034] The technical problem to be solved by the present application can also be realized by the following technical scheme, the above-mentioned pneumatic door breaker, the unlocking mechanism comprises;

[0035] an unlocking rod, one end of the unlocking rod is arranged in the cavity at the execution end of the brake chamber, and the other end of the unlocking rod extends to the rear fixed plate and is provided with a slope surface;

[0036] a limiting slide, which is slidingly installed on the rear fixed plate, is perpendicular to the axis of the impact rod, one end of the limiting slide abuts against the middle part of the slope surface of the unlocking rod, and the other end of the limiting slide is installed on the rear fixed plate through a reset mechanism, and a limiting hole for the impact rod to pass through is formed in the middle part of the limiting slide;

[0037] The limiting slot is opened on the outer circumferential surface of the part of the impact rod extending from the installation cylinder, the one end edge of the limiting slot is smoothly connected with the outer circumferential surface of the impact rod, and the other end edge forms an abutting surface abutting with the limiting hole on the limiting slide, so that the limiting slot does not abut with the limiting slide when the impact rod performs the impact action, and the abutting surface of the limiting slot abuts on the limiting slide when the impact rod returns.

[0038] The limiting hole of the limiting slide is clamped on the limiting slot of the impact rod when the elastic element II is in the compressed state, so as to prevent the elastic element II from releasing the elastic potential energy causing the impact rod to impact the valve rod.

[0039] The technical problem to be solved by the present application can also be realized by the following technical scheme, the above-mentioned pneumatic door breaker, the reset mechanism comprises;

[0040] The reset slot is opened on the bottom wall of the rear fixed plate;

[0041] The reset pin is fixed at one end on the limiting slide and extends into the reset slot at the other end;

[0042] The elastic element III is fixed at one end on the inner wall of the reset slot and at the other end on the reset pin, and when the limiting hole is clamped in the limiting slot, the elastic element III is in a relaxed state.

[0043] The technical problem to be solved by the present application can also be realized by the following technical scheme, the above-mentioned pneumatic door breaker, further comprising a support connecting pipe, which is symmetrically fixed and installed on both sides of the front fixed plate, the middle fixed plate and the rear fixed plate, and the switches of the aforementioned valve I, valve II and valve III are installed on the outer wall of one of the support connecting pipes;

[0044] Vertical handles are fixedly installed on the bottom walls of the front fixed plate and the rear fixed plate;

[0045] A pressure gauge is installed on the front fixed plate, the test contact of the pressure gauge is placed in the high-pressure air chamber of the installation cylinder, and a power supply chamber is installed on the bottom surface of the middle fixed plate and the rear fixed plate.

[0046] The technical problem to be solved by the present application can also be realized by the following technical scheme, a door breaking method of a pneumatic door breaker, which adopts the above technical scheme, and the steps are as follows:

[0047] (1) before breaking the door, we use two staffs to hold four vertical handles on the bottom wall of the front and rear fixed plates, move the pneumatic door breaker to the place where the door needs to be broken, and temporarily place the pneumatic door breaker on the ground, at this time the four vertical handles are vertically erected on the ground, we then connect the air outlet pipe of the fire air supply system to the high-pressure pipe interface of the installation cylinder, thereby automatically inflating the high-pressure air chamber area in the installation cylinder, when the inflation reaches a certain air pressure value, the two staffs hold the vertical handles to lift the pneumatic door breaker to the door lock position, at this time the pneumatic door breaker is in a state of waiting to break the door;

[0048] (2) when breaking the door, we press the switch of valve I on the support connecting pipe, at this time part of the high-pressure gas in the high-pressure air chamber will enter the impact chamber through valve I, causing the brake piston to move away from the high-pressure air chamber, during which the elastic element II is compressed, until the limiting slide is in the limiting groove of the impact rod, at this time valve I is closed, the high-pressure gas in the impact chamber is released through valve III, and valve III is closed after the release is completed, at this time it is in a state of waiting to fire, then the impact rod is aimed at the door lock, and the switch of valve II is pressed, causing the high-pressure gas to enter the cavity of the brake chamber, causing the unlocking rod to move away from the high-pressure air chamber, during which the slope on the end of the unlocking rod pushes the limiting slide downward while abutting with the upper end surface of the limiting slide, causing the limiting slide to no longer be stuck in the limiting groove of the impact rod, causing the elastic element II in the compressed state to release its elastic potential energy, and causing the impact rod to move towards the high-pressure air chamber and impact the valve rod, causing the high-pressure gas in the high-pressure air chamber to be instantly sprayed into the impact chamber and instantly push the impact rod, causing the impact head on the impact rod to impact the door lock once, at this time the single breaking action is completed;

[0049] (3) when repeating the breaking, after completing the single breaking action, if the door lock is not completely damaged, at this time the fire air supply system will inflate the high-pressure air chamber again, and because the end of the limiting groove towards the brake piston is smoothly connected with the outer surface of the impact rod when the impact rod performs the first impact action, at the moment of impact of the impact rod, the limiting hole on the limiting slide does not abut with the limiting groove, and when the impact rod returns, the abutting surface of the limiting groove abuts on the limiting slide, at this time the state of waiting to fire is repeated, and the second breaking action can be performed by pressing the valve II switch again, which can be repeated multiple times until the breaking operation is completed.

[0050] Compared with the prior art, the beneficial technical effects of the present application include:

[0051] (1) The present application uses high-pressure gas of a fire air-raid system as a power source, i.e. without additional power source, only with the help of high-pressure gas provided by the fire air-raid system, which greatly reduces the complexity of the equipment and the dependence on external conditions, improves the portability and applicability of the equipment, and through the pneumatic assembly, the energy of high-pressure gas can be quickly converted into kinetic energy of the impact piece, realizing rapid and powerful impact on the door lock or door body, thereby significantly improving the door breaking speed;

[0052] (2) After single door breaking, the pneumatic door breaker can be inflated again by the fire air-raid system to reset the impact piece and prepare for the next door breaking, which greatly improves the utilization rate and door breaking success rate of the equipment;

[0053] (3) The impact piece is provided with an elastic element II for resetting the impact rod, which can be reset automatically after each door breaking, simple to use and high in practicality. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 is a schematic diagram of the three-dimensional structure of the pneumatic door breaker of the present application;

[0055] Figure 2 is a schematic diagram of the bottom view structure of the pneumatic door breaker of the present application;

[0056] Figure 3 is a schematic diagram of the full section structure of the door breaker of the present application;

[0057] Figure 4 is a schematic diagram of the top view structure of the unlocking mechanism of the present application;

[0058] Figure 5 is a schematic diagram of the full section structure of the unlocking mechanism of the present application;

[0059] Figure 6 is a schematic diagram of the three-dimensional structure of the unlocking mechanism of the present application;

[0060] Figure 7 is a schematic diagram of the top view structure of the driving assembly of the present application;

[0061] Figure 8 is a schematic diagram of the full section structure of the driving assembly of the present application;

[0062] Figure 9 is a schematic diagram of the three-dimensional structure of the driving assembly of the present application; Figure 5 is a schematic diagram of the local enlarged structure of the driving assembly of the present application.

[0063] Reference signs: 1, mounting cylinder; 2, high-pressure gas chamber; 3, impact chamber; 4, intermediate fixing plate; 5, gas groove; 6, valve rod; 7, valve core; 8, support; 9, centering hole; 10, support screw; 11, brake piston; 12, brake chamber; 13, distributor; 14, gas passage; 15, valve I; 16, valve II; 17, valve III; 18, impact rod; 19, impact head; 20, front fixing plate; 21, rear fixing plate; 22, high-pressure pipe interface; 23, unlocking rod; 24, slope; 25, limiting hole; 26, limiting groove; 27, abutting surface; 28, reset groove; 29, reset pin; 30, limiting sliding piece; 31, vertical handle; 32, pressure gauge; 33, power supply chamber. DETAILED DESCRIPTION

[0064] The specific technical solutions of the present application are further described below with reference to the accompanying drawings, so as to further understand the present application by those skilled in the art, without limiting the rights thereof.

[0065] Embodiment 1, refer to Figures 1-3 A pneumatic door breaker, comprising:

[0066] The mounting cylinder 1 is formed into a substantially cylindrical structure;

[0067] The valve rod assembly is disposed in the mounting cylinder 1, and the mounting cylinder 1 is divided into the high-pressure gas chamber 2 and the impact chamber 3 by the valve rod assembly;

[0068] The impact member is disposed in the impact chamber 3 of the mounting cylinder 1 at one end and extends to the outside of the mounting cylinder 1 at the other end and is used for breaking the door;

[0069] The drive assembly is configured to be linked with the valve rod assembly, so that the compressed gas in the high-pressure gas chamber 2 is released to the impact chamber 3, and the impact member is driven to break the door.

[0070] Embodiment 2, the pneumatic door breaker of embodiment 1, wherein the valve rod assembly comprises:

[0071] The intermediate fixing plate 4 is formed into a substantially plate-like structure, which is disposed in the middle part of the mounting cylinder 1, and the space between the two ends of the mounting cylinder 1 to the intermediate fixing plate 4 is sequentially formed into the high-pressure gas chamber 2 and the impact chamber 3, and the gas groove 5 for gas flow is formed in the middle part of the intermediate fixing plate 4, which can actually be a cylindrical through groove;

[0072] The valve rod 6 and the valve core 7, one end of the valve rod 6 is disposed in the high-pressure gas chamber 2, and the other end extends to the impact chamber 3 through the gas groove 5, and the valve rod 6 is formed into a substantially cylindrical rod-like body, and the valve core 7 is fixed on the outer circumferential surface of the middle part of the valve rod 6 to selectively block the gas groove 5;

[0073] The valve core 7 on the valve rod 6 is supported by the centering and fixing assembly to block the gas groove 5.

[0074] In the embodiment 2, the valve core 7 on the valve rod 6 is used to block the gas groove 5. When the high-pressure gas chamber 2 is filled with gas, the gas pressure can press the valve core 7 on the gas groove 5, so that a relatively closed gas chamber is formed in the high-pressure gas chamber 2. When the valve core 7 moves along the valve rod 6 towards the centering and fixing assembly, the gas in the high-pressure gas chamber 2 can be released into the impact chamber 3.

[0075] In the embodiment 3, the centering and fixing assembly comprises:

[0076] A plurality of support pieces 8 are arranged in the high-pressure gas chamber 2. The support piece 8 is formed as a polygonal plate structure, and its specific structure can be selected according to the use requirement. The support piece 8 has a centering hole 9 through which the valve rod 6 passes. The outer wall of the support piece 8 abuts against the inner wall of the high-pressure gas chamber 2 of the mounting cylinder 1, so that the axis of the centering hole 9 is always on the axis of the mounting cylinder 1.

[0077] A support screw 10 is arranged. One end of the support screw 10 is fixed to the support piece 8, and the other end of the support screw 10 is opposite to the side wall of the mounting cylinder 1.

[0078] An elastic element I (not shown in the figure) is arranged on the outer wall of the valve rod 6. One end of the elastic element I abuts against the side wall of the valve core 7, and the other end of the elastic element I abuts against the side wall of the support piece 8. The elastic potential energy of the elastic element I (not shown in the figure) can press the valve core 7 to abut against the slot of the gas groove 5, that is, to block the slot.

[0079] In the embodiment 3, that is, regardless of the shape of the support piece 8, only the outer wall of the support piece 8 can abut against the inner wall of the mounting cylinder 1, and the valve rod 6 is supported by the centering hole 9.

[0080] In the embodiment 4, referring to Figures 7-8 , the driving assembly of the pneumatic door breaker in the embodiment 2 comprises:

[0081] A brake piston 11 is arranged in the impact chamber 3. One side of the brake piston 11 is opposite to the end of the valve rod 6, and the other side of the brake piston 11 is integrated with the impact piece. An elastic element IV (not shown in the figure) is arranged on the outer wall of the brake piston 11 and the inner wall of the end of the impact chamber 3 away from the high-pressure gas chamber 2. The design purpose of the elastic element IV is to reset the brake piston 11 by releasing the elastic potential energy of the elastic element IV after each time the brake piston 11 is pushed.

[0082] A brake chamber 12, which is formed as a hollow cylindrical structure, is fixed to the intermediate fixed plate 4 and has a cavity inside, one end of which is a control end and the other end is an execution end;

[0083] A distributor 13, which is formed as a substantially square block structure, is fixed to the control end of the brake chamber 12, and a gas passage 14 is formed in the distributor 13, the gas inlet end of the gas passage 14 is communicated with the high-pressure gas chamber 2, and the gas outlet end of the gas passage 14 is communicated with the cavity of the brake chamber 12 and the impact chamber 3, respectively;

[0084] A valve I 15 is installed on the distributor 13 and located at the part of the gas passage 14 communicated to the impact chamber 3, so as to control the on-off of the high-pressure gas entering the impact chamber 3 from the gas passage 14;

[0085] A valve II 16 is installed in the cavity of the brake chamber 12, so as to control the on-off of the high-pressure gas entering the cavity from the gas passage 14;

[0086] A valve III 17 is installed outside the impact chamber 3 of the mounting cylinder 1, which is configured to release the gas in the impact chamber 3;

[0087] An unlocking mechanism is arranged between the mounting cylinder 1 and the impact piece.

[0088] In example 4, the valve I 15 is used to control the on-off of the high-pressure gas in the high-pressure gas chamber 2 entering the impact chamber 3 from the gas passage 14, the valve II 16 is used to control the on-off of the high-pressure gas in the high-pressure gas chamber 2 entering the brake chamber 12 from the gas passage 14, and the valve III 17 is used to release the gas in the impact chamber 3.

[0089] In example 5, the impact piece of the pneumatic door breaker described in example 4 comprises:

[0090] An impact rod 18, which is formed as a substantially cylindrical structure, one end of the impact rod 18 is fixed to the side surface of the brake piston 11, and the other end of the impact rod 18 extends out of the mounting cylinder 1, a impact head 19 for impacting the door is fixed on the outer peripheral surface of the impact rod 18 extending out of the mounting cylinder 1, and the impact head 19 is formed as a substantially circular truncated cone structure;

[0091] A elastic element II (not shown in the figure) is sleeved on the outer peripheral surface of the impact rod 18, one end of the elastic element II abuts against the end surface of the brake piston 11, and the other end of the elastic element II abuts against the inner wall of the impact chamber 3 of the mounting cylinder 1.

[0092] It should be noted that the elastic element I, the elastic element II and the elastic element III described below can be elastic elements such as springs.

[0093] In example 6, the pneumatic door breaker described in example 5 further comprises a front fixed plate 20 and a rear fixed plate 21, both of which are formed as substantially plate structures;

[0094] The front fixed plate 20 is fixed on the end of the installation cylinder 1 near the high-pressure air chamber 2, and a high-pressure pipe interface 22 is installed on the front fixed plate 20 and connected with the inside of the high-pressure air chamber 2, which is used to connect the air supply pipe of the air breathing system of the fire-fighting personnel;

[0095] The rear fixed plate 21 is fixed on the end of the installation cylinder 1 near the impact chamber 3.

[0096] Embodiment 7, referring to Figures 4-6 , 5, the unlocking mechanism of the pneumatic door breaching device of embodiment 5 comprises;

[0097] The unlocking lever 23 is formed as a substantially cylindrical lever structure, one end of the unlocking lever 23 is placed in the cavity at the execution end of the brake chamber 12, the other end extends to the rear fixed plate 21 and is provided with a slope surface 24, the angle between the slope surface 24 and the horizontal plane can be selected by itself, and the slope surface 24 is opposite to the upper end of the limiting slide 30;

[0098] The limiting slide 30 is vertically arranged and formed as a substantially square plate structure, which is slidingly installed on the rear fixed plate 21 and perpendicular to the axis of the impact lever 18, one end of the limiting slide 30 abuts on the middle part of the slope surface 24 of the unlocking lever 23, and the other end is installed on the rear fixed plate 21 through a reset mechanism, and a limiting hole 25 for the impact lever 18 to pass through is formed in the middle part of the limiting slide 30, which is formed as a substantially circular hole structure;

[0099] The limiting groove 26 is formed as a substantially annular groove, which is formed on the outer circumferential surface of the part of the impact lever 18 extending out of the installation cylinder 1, one end edge of the limiting groove 26 towards the brake piston 11 is smoothly connected with the outer circumferential surface of the impact lever 18, and the other end edge forms an abutting surface 27 which can abut on the limiting hole 25 on the limiting slide 30, so that the limiting groove 26 does not abut on the limiting slide 30 when the impact lever 18 performs the impact action, and the abutting surface 27 of the limiting groove 26 abuts on the limiting slide 30 when the impact lever 18 returns;

[0100] The limiting hole 25 of the limiting slide 30 is clamped on the limiting groove 26 of the impact lever 18 under the compression state of the elastic element II by the reset mechanism, so as to prevent the elastic element II from releasing the elastic potential energy to make the impact lever 18 impact the valve rod 6.

[0101] Embodiment 8, the reset mechanism of the pneumatic door breaching device of embodiment 7 comprises;

[0102] The reset groove 28 is formed as a substantially square groove structure, and is formed on the bottom wall of the rear fixed plate 21;

[0103] Reset pin 29, one end fixed in the limit slide 30, the other end to the reset slot 28;

[0104] Elastic element III, one end fixed in the reset slot 28, the other end fixed in the reset pin 29, the limit hole 25 is clamped in the limit slot 26, the elastic element III is in the elongation state.

[0105] In example 8, the design purpose of the reset mechanism is to push the reset pin 29 and the limit slide 30, so that the limit hole 25 on the limit slide 30 always abuts on the outer surface of the impact rod 18.

[0106] Example 9, a pneumatic door breaker as claimed in example 7, further comprising a support connecting pipe 31, which is formed into a generally rod-shaped structure, which is symmetrically fixedly installed on both sides of the front fixed plate 20, the middle fixed plate 4 and the rear fixed plate 21, the switch of the valve I 15, the valve II 16 and the valve III 17 is installed on the outer wall of one of the support connecting pipes 31;

[0107] The vertical handle 31 is fixedly installed on the bottom wall of the front fixed plate 20 and the rear fixed plate 21, respectively, and the vertical handle 31 is formed into a generally cylindrical structure;

[0108] The pressure gauge 32 is installed on the front fixed plate 20, and the test contact of the pressure gauge 32 is placed in the high-pressure gas chamber 2 of the installation cylinder 1, and the power supply chamber 33 is installed on the bottom surface of the middle fixed plate 4 and the rear fixed plate 21.

[0109] Example 10, a door breaking method of a pneumatic door breaker, which uses the pneumatic door breaker in examples 1-9, the steps are as follows:

[0110] (1) Before breaking the door, we use two staffs to hold the four vertical handles 31 on the bottom wall of the front fixed plate 20 and the rear fixed plate 21, move the pneumatic door breaker to the place where the door needs to be broken, and temporarily place the pneumatic door breaker on the ground, at this time the four vertical handles 31 are vertically erected on the ground, we then connect the air outlet pipe of the fire air supply system to the high-pressure pipe interface 22 of the installation cylinder 1, thereby automatically inflating the high-pressure gas chamber 2 area in the installation cylinder 1, when the air pressure reaches a certain value, the two staffs hold the vertical handle 31 to lift the pneumatic door breaker to the door lock position, at this time it is in the state of waiting to break the door;

[0111] (2) when breaking the door, we press the switch of valve 115 on the support connecting pipe 31, at this time, part of the high pressure gas in the high pressure gas chamber 2 will enter into the impact chamber 3 through valve 115, so that the brake piston 11 moves away from the high pressure gas chamber 2, during which the elastic element II is compressed, until the limiting slide 30 can be on the limiting groove 26 of the impact rod 18, at this time, close valve 115, and release the high pressure gas in the impact chamber 3 through valve 117, close valve 117 after the release is completed, at this time, it is in the state of waiting to fire, then align the impact rod 18 to the door lock, press the switch of valve 116, so that the high pressure gas enters into the cavity of the brake chamber 12, so that the unlocking rod 23 moves away from the high pressure gas chamber 2, during which the slope 24 on the end of the unlocking rod 23 will push the limiting slide 30 downward while abutting with the upper end surface of the limiting slide 30, so that the limiting slide 30 is no longer clamped in the limiting groove 26 of the impact rod 18, so that the elastic element II in the compressed state releases its elastic potential energy, and the impact rod 18 moves towards the high pressure gas chamber 2, and hits the valve rod 6, so that the high pressure gas in the high pressure gas chamber 2 is sprayed into the impact chamber 3, and the impact rod 18 is pushed instantly, so that the impact head 19 on the impact rod 18 hits the door lock once, at this time, the single breaking action is completed;

[0112] (3) when repeating the breaking of the door, after completing the single breaking action, if the door lock is not completely damaged, at this time, the fire alarm system will inflate the inside of the high pressure gas chamber 2 again, and the limiting groove 26 of the impact rod 18 is smoothly connected with the outer surface of the impact rod 18 towards the brake piston 11 when the first impact action is implemented, so that the limiting hole 25 on the limiting slide 30 does not abut with the limiting groove 26 at the moment of impact of the impact rod 18, and the abutting surface 27 of the limiting groove 26 abuts on the limiting slide 30 when the impact rod 18 returns, at this time, the state of waiting to fire is repeated, and the second breaking action is performed by pressing the switch of valve 116 again, which can be repeated many times until the breaking operation is completed.

Claims

1. A pneumatic door breacher, characterized by: It comprises; The installation cylinder; The valve rod assembly is arranged in the installation cylinder, and the installation cylinder is divided into the high-pressure gas chamber and the impact chamber by the valve rod assembly; The impact piece is arranged in the impact chamber of the installation cylinder and extends to the outside of the installation cylinder and is used for breaking the door; The driving assembly is arranged in the installation cylinder and is connected with the valve rod assembly, so that the compressed gas in the high-pressure gas chamber is discharged into the impact chamber, and the impact piece is driven to break the door; The valve rod assembly comprises; The intermediate fixed plate is arranged in the middle part of the installation cylinder, and the space between the two ends of the installation cylinder and the intermediate fixed plate is sequentially formed into the high-pressure gas chamber and the impact chamber, and the gas groove for the gas flow is formed in the middle part of the intermediate fixed plate; The valve rod and the valve core are arranged in the high-pressure gas chamber, one end of the valve rod is arranged in the high-pressure gas chamber, the other end of the valve rod extends to the impact chamber through the gas groove, and the valve core is fixed on the outer circumferential surface of the middle part of the valve rod to selectively seal the gas groove; The centering and fixing assembly for supporting the valve core on the valve rod to keep the valve core from sealing the gas groove is arranged in the high-pressure gas chamber; The centering and fixing assembly comprises; A plurality of support pieces are arranged in the high-pressure gas chamber, the support pieces are provided with the centering holes through which the end of the valve rod passes, and the outer wall of the support piece abuts against the inner circumferential surface of the high-pressure gas chamber of the installation cylinder, so that the axis of the centering hole is always on the axis of the installation cylinder; The support screw is fixed on the support piece at one end and is opposite to the side wall of the installation cylinder at the other end; The elastic element I is sleeved on the outer circumferential surface of the valve rod, one end of the elastic element I abuts against the side wall of the valve core, and the other end of the elastic element I abuts against the side wall of the support piece, so that the valve core seals the gas groove; The driving assembly comprises; The brake piston is arranged in the impact chamber, one side of the brake piston is opposite to the end of the valve rod, and the other side of the brake piston is integrated with the impact piece; The brake chamber is fixed on the intermediate fixed plate and has a cavity in the inside, one end of the brake chamber is the control end, and the other end of the brake chamber is the execution end; The distributor is fixed at the control end of the brake chamber, the gas passage is formed in the distributor, the gas inlet end of the gas passage is communicated with the high-pressure gas chamber, and the gas outlet end of the gas passage is respectively communicated with the cavity of the brake chamber and the impact chamber; The valve I is arranged on the distributor and is located on the part of the gas passage communicated with the impact chamber, so as to control the opening and closing of the high-pressure gas in the impact chamber through the gas passage; The valve II is arranged in the cavity of the brake chamber, so as to control the opening and closing of the high-pressure gas in the cavity through the gas passage; The valve III is arranged outside the impact chamber of the installation cylinder and is configured to discharge the gas in the impact chamber; The unlocking mechanism is arranged between the installation cylinder and the impact piece.

2. The pneumatic door breacher of claim 1, wherein: The impact piece comprises; The impact rod is fixed on the side of the brake piston at one end and extends to the outside of the installation cylinder at the other end, the impact head for impacting the door is fixed on the outer circumferential surface of the impact rod extending to the outside of the installation cylinder; The elastic element II is sleeved on the outer circumferential surface of the impact rod, one end of the elastic element II abuts against the end surface of the brake piston, and the other end of the elastic element II abuts against the inner wall of the impact chamber of the installation cylinder.

3. The pneumatic door breacher of claim 2, wherein: The front fixed plate and the rear fixed plate are further arranged; The front fixed plate is fixed on the end of the installation cylinder close to the high-pressure gas chamber, and the high-pressure pipe interface communicated with the inside of the high-pressure gas chamber is arranged on the front fixed plate; The rear fixed plate is fixed on the end of the installation cylinder close to the impact chamber.

4. The pneumatic door breacher of claim 2, wherein: The unlocking mechanism comprises; The unlocking rod has one end placed in a cavity at the execution end of the brake chamber and the other end extending to the rear fixed plate and having a slope surface; The limiting slide is slidingly installed on the rear fixed plate and perpendicular to the axis of the impact rod, one end of the limiting slide abutting on the middle part of the slope surface of the unlocking rod and the other end being installed on the rear fixed plate through a reset mechanism, a limiting hole for the impact rod to pass through being formed in the middle part of the limiting slide; The limiting groove is formed on the outer circumferential surface of the part of the impact rod extending out of the installation cylinder, one end of the limiting groove smoothly connecting with the outer circumferential surface of the impact rod and the other end forming an abutting surface abutting with the limiting hole on the limiting slide, so that the limiting groove does not abut with the limiting slide when the impact rod performs the impact action and the abutting surface of the limiting groove abuts on the limiting slide when the impact rod returns. The reset mechanism can make the limiting hole of the limiting slide clamped on the limiting groove of the impact rod when the elastic element II is in the compressed state, so as to prevent the elastic element II from releasing the elastic potential energy of the impact rod impacting the valve rod.

5. The pneumatic door breacher of claim 4, wherein: The reset mechanism comprises; The reset groove is formed on the bottom wall of the rear fixed plate; The reset pin has one end fixed on the limiting slide and the other end extending into the reset groove; The elastic element III has one end fixed on the inner wall of the reset groove and the other end fixed on the reset pin, and the elastic element III is in the relaxed state when the limiting hole is clamped in the reset groove.

6. The pneumatic door breacher of claim 4, wherein: The support connecting pipes are symmetrically fixedly installed on the two sides of the front fixed plate, the middle fixed plate and the rear fixed plate, and the switches of the valve I, the valve II and the valve III are installed on the outer wall of one of the support connecting pipes; Vertical handles are fixedly installed on the bottom walls of the two sides of the front fixed plate and the rear fixed plate; A pressure gauge is installed on the front fixed plate, a test contact of the pressure gauge being placed in the high-pressure gas chamber of the installation cylinder, and a power supply chamber is installed on the bottom surface of the middle fixed plate and the rear fixed plate.

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