Pneumatic cutting device

Abstract

The invention relates to the technical field of cutting machines, in particular to a pneumatic cutting device. The pneumatic cutting device comprises a high-pressure air pressure adjusting structure, a power switching structure and a cutting structure, the power switching structure is provided with a first airflow cavity and a second airflow cavity, the first airflow cavity and the second airflow cavity are oppositely arranged, and the first airflow cavity and the second airflow cavity both communicate with the high-pressure air pressure adjusting structure; and the cutting structure is partially arranged in the first airflow cavity and partially arranged in the second airflow cavity, and the cutting structure can be selectively pushed by airflow in the first airflow cavity or the second airflow cavity to move. The pneumatic cutting device achieves cutting with airflow as power, and therefore enough force is provided for cutting regardless of the distance between the power switching structure and the high-pressure air pressure adjusting structure.

Description

Technical Field

[0001] This invention relates to the field of cutting machine technology, and more particularly to a pneumatic cutting device. Background Technology

[0002] If foreign objects fall between the heat transfer tubes of a nuclear power plant's steam generator, the vibration caused by the water flow can wear down the tubes and threaten the pressure boundary of the primary loop. Because the spacing between heat transfer tubes is typically very small, only a few millimeters, the likelihood of foreign objects getting stuck is high. Therefore, foreign object removal often requires cutting the object before removal. Current foreign object cutting tools generally have complex structures, and long-distance mechanical operation can easily lead to tool malfunctions. Summary of the Invention

[0003] In one aspect, the present invention provides a pneumatic cutting device to solve the problem that long-distance mechanical operation is prone to tool malfunctions.

[0004] This invention provides a pneumatic cutting device, comprising a high-pressure air pressure regulating structure, a power switching structure, and a cutting structure. The power switching structure has a first airflow chamber and a second airflow chamber, which are disposed opposite to each other. Both the first and second airflow chambers are connected to the high-pressure air pressure regulating structure. The cutting structure is partially disposed in the first airflow chamber and partially disposed in the second airflow chamber. The cutting structure can be pushed by the airflow in one of the first and second airflow chambers to move towards the other airflow chamber.

[0005] Based on the above technical solutions, optionally, the power switching structure also has a connecting channel and a first air intake channel, the connecting channel is connected to the first air intake channel, the first end of the connecting channel is connected to the first airflow chamber, and the second end of the connecting channel is connected to the second airflow chamber.

[0006] Based on the above technical solutions, optionally, the cutting structure includes a cutting tool and a lever, the lever being movably connected to the power switching structure, the lever having a first position and a second position, when the lever is in the first position, the lever blocks the air inlet of the first airflow chamber and releases the air outlet of the first airflow chamber, when the lever is in the second position, the lever blocks the air inlet of the second airflow chamber and releases the air outlet of the second airflow chamber, the cutting tool is partially disposed in the second airflow chamber and partially disposed in the first airflow chamber, the cutting tool being able to move to the other after airflow is introduced into one of the first airflow chamber and the second airflow chamber.

[0007] Based on the above technical solutions, optionally, the paddle has a vent hole. When the paddle is in the first position, the connecting channel is connected to the first airflow chamber through the vent hole. When the paddle is in the second position, the connecting channel is connected to the second airflow chamber through the vent hole.

[0008] Based on the above technical solutions, optionally, the power switching structure also has an opening facing the foreign object, the length extension direction of the opening is in the same direction as the extension direction of the cutting structure, the first airflow chamber and the second airflow chamber are both connected to the opening, the cutting part of the tool is located in the opening, and the opening can accommodate at least part of the foreign object.

[0009] Based on the above technical solutions, optionally, the power switching structure also has a lifting part for raising foreign objects, and the lifting part is disposed at the opening.

[0010] Based on the above technical solutions, optionally, the first airflow chamber includes a first sub-inlet channel, a first outlet channel, and a first reversing channel. The first end of the first sub-inlet channel is selectively connected to or disconnected from the vent of the paddle. The second end of the first sub-inlet channel is connected to the first end of the first reversing channel. The first end of the first outlet channel is connected to the first sub-inlet channel. The connection between the first outlet channel and the first sub-inlet channel is located between the first end of the first outlet channel and the second end of the first outlet channel. The second end of the first outlet channel is connected to the second end of the first reversing channel. And / or, the second airflow chamber includes a second sub-inlet channel, a second outlet channel, and a second reversing channel. The first end of the second sub-inlet channel is connected to the vent hole. The second end of the second sub-inlet channel is selectively connected to or disconnected from the first end of the second reversing channel. The first end of the second outlet channel is connected to the second sub-inlet channel. The connection between the second sub-inlet channel and the second outlet channel is located between the first end of the second sub-inlet channel and the second end of the second sub-inlet channel. The second end of the second outlet channel is connected to the second end of the second reversing channel.

[0011] Based on the above technical solutions, optionally, the second end of the first sub-intake channel and the second end of the second sub-intake channel are arranged opposite to each other, the first end of the cutter is located in the first sub-intake channel, the second end of the cutter is located in the second sub-intake channel, and the cutter can selectively block the first end of the first reversing channel or the first end of the second reversing channel.

[0012] Based on the above technical solution, optionally, the first airflow chamber further includes a first exhaust channel, and the second airflow chamber further includes a second exhaust channel. The first exhaust channel is connected to the second end of the first reversing channel with the outside atmosphere, and the second exhaust channel is connected to the second end of the second reversing channel with the outside atmosphere. The first exhaust channel and the second exhaust channel can be selectively blocked by the lever.

[0013] Based on the above technical solutions, optionally, the cutting structure further includes an elastic limiting member, one end of which is fixedly connected to the channel wall of the first air intake channel or the channel wall of the connecting channel, and the other end is fixedly connected to the paddle. And / or, the cutting structure further includes a stop airbag, which is fixedly connected to one end of the power switching structure.

[0014] The above technical solution has at least the following advantages or beneficial effects: Since the first and second airflow chambers are arranged opposite each other, the pneumatic cutting device achieves reciprocating movement of the cutting structure by switching the flow direction of the gas, thereby enabling the cutting structure to cut foreign objects with airflow as power. Because the cutting is achieved with airflow as power, the pneumatic cutting device has sufficient force to cut regardless of the distance between the power switching structure and the high-pressure air pressure regulation structure. Compared with related technologies, this pneumatic cutting device has a more compact structure and can more effectively serve on-site work.

[0015] Because the stop airbag is connected to the high-pressure air pressure regulation structure, and the stop airbag abuts against the pipeline, it can stabilize the power switching structure and prevent the power switching structure from shaking during operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the pneumatic cutting device in an embodiment of the present invention; Figure 2 This is a cross-sectional view of the power switching structure and the cutting structure after installation in an embodiment of the present invention; Figure 3 This is a front view of the paddle in an embodiment of the present invention; Figure 4 This is a top view of the paddle in an embodiment of the present invention; Figure 5 This is a front view of the cutting tool in an embodiment of the present invention; Figure 6 This is a top view of the cutting tool in an embodiment of the present invention; Figure 7 This is a side view of the cutting tool in an embodiment of the present invention; Figure 8 A first working schematic diagram of the pneumatic cutting device in an embodiment of the present invention; Figure 9 A second working schematic diagram of the pneumatic cutting device in this embodiment of the invention; Figure 10 A third working schematic diagram of the pneumatic cutting device in this embodiment of the invention.

[0017] In the picture: 1. High-pressure air pressure regulation structure; 2. Power switching structure; 21. First airflow chamber; 211. First sub-intake channel; 212. First exhaust channel; 213. First reversing channel; 214. First exhaust channel; 22. Second airflow chamber; 221. Second sub-intake channel; 222. Second exhaust channel; 223. Second reversing channel; 224. Second exhaust channel; 23. Connecting channel; 24. First intake channel; 25. Opening; 26. Elevation part; 27. First limiting step; 28. Second limiting step; 3. Paddle; 31. Blocking part; 311. Vent hole; 32. First limiting part; 4. Cutting tool; 41. Working part; 42. Second limiting part; 5. Elastic limiting element; 6. Stop airbag; 7. Flexible connecting tube; 8. Cutting switch valve; 9. Airbag switch valve. Detailed Implementation

[0018] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] like Figures 1 to 2 As shown, a pneumatic cutting device is provided, which includes a high-pressure air pressure regulating structure 1, a power switching structure 2, and a cutting structure. The power switching structure 2 has a first airflow chamber 21 and a second airflow chamber 22, which are arranged opposite to each other. Both the first airflow chamber 21 and the second airflow chamber 22 are connected to the high-pressure air pressure regulating structure 1. The cutting structure is partially disposed in the first airflow chamber 21 and partially disposed in the second airflow chamber 22. The cutting structure can be pushed by the airflow in one of the airflow chambers 21 and 22 to move towards the other airflow chamber.

[0023] Since the first airflow chamber 21 and the second airflow chamber 22 are arranged opposite to each other, the pneumatic cutting device achieves reciprocating movement of the cutting structure by switching the flow direction of the gas, thereby enabling the cutting structure to cut foreign objects with airflow as power. The pneumatic cutting device achieves cutting with airflow as power, and thus has sufficient power to cut regardless of the distance between the power switching structure 2 and the high-pressure air pressure regulating structure 1. Compared with related technologies, the structure of this pneumatic cutting device is more compact and can serve the field work more effectively.

[0024] For example, the high-pressure air pressure regulating structure 1 is connected to the power switching structure 2 through a flexible connecting pipe 7. The flexible connecting pipe 7 is equipped with a cutting switch valve 8 to control the connection and disconnection between the high-pressure air pressure regulating structure 1 and the power switching structure 2.

[0025] The high-pressure air pressure regulating structure 1 provides an air source for the power switching structure 2. For example, the high-pressure air pressure regulating structure 1 is an air compressor.

[0026] In some embodiments, the power switching structure 2 further includes a connecting channel 23 and a first air intake channel 24, the connecting channel 23 being connected to the first air intake channel 24, the first end of the connecting channel 23 being connected to the first airflow chamber 21, and the second end of the connecting channel 23 being connected to the second airflow chamber 22.

[0027] The connection between the connecting channel 23 and the first air intake channel 24 is located between the first end and the second end of the connecting channel 23, that is, the first air intake channel 24 and the connecting channel 23 are connected in the middle.

[0028] Specifically, the high-pressure air pressure regulating structure 1 is connected to the first air intake channel 24 via a flexible connecting pipe 7. The connecting channel 23 acts as an intermediate medium channel, connecting the first air intake channel 24 with the first airflow chamber 21 and the second airflow chamber 22. One end of the first air intake channel 24 is connected to the flexible connecting pipe 7, while the other end is connected to the middle of the connecting channel 23. One end of the first air intake channel 24 passes through the power switching structure 2 and connects to the high-pressure air pressure regulating structure 1, thereby introducing high-pressure gas from the high-pressure air pressure regulating structure 1 into the connecting channel 23 to provide high-pressure gas for the first airflow chamber 21 and the second airflow chamber 22, thus providing power for the cutting structure. The arrangement of the first air intake channel 24 and the connecting channel 23 allows for a more compact overall design of the power switching structure 2. The first airflow chamber 21 and the second airflow chamber 22 receive air from the same location, further reducing the volume of the pneumatic cutting device and enabling it to be used in narrower spaces.

[0029] Of course, in other embodiments, the high-pressure air pressure regulating structure 1 can be connected to the first airflow chamber 21 and the second airflow chamber 22 respectively. A first solenoid valve is provided at the connection between the first airflow chamber 21 and the high-pressure air pressure regulating structure 1, and a second solenoid valve is provided at the connection between the second airflow chamber 22 and the high-pressure air pressure regulating structure 1. In this way, the airflow in the high-pressure air pressure regulating structure 1 can be controlled to flow to the first airflow chamber 21 or the second airflow chamber 22 by controlling the opening or closing of the first solenoid valve and the second solenoid valve, thereby driving the cutting structure to move in the direction of the first airflow chamber 21 or the second airflow chamber 22, so as to achieve the purpose of reciprocating movement of the cutting structure.

[0030] like Figure 2As shown, in some embodiments, the cutting structure includes a blade 4 and a lever 3. The lever 3 is movably connected to the power switching structure 2. The lever 3 has a first position and a second position. When the lever 3 is in the first position, the lever 3 blocks the air inlet of the first airflow chamber 21 and releases the air outlet of the first airflow chamber 21. When the lever 3 is in the second position, the lever 3 blocks the air inlet of the second airflow chamber 22 and releases the air outlet of the second airflow chamber 22. The blade 4 is partially disposed in the second airflow chamber 22 and partially disposed in the first airflow chamber 21. The blade 4 can move from one of the first airflow chamber 21 and the second airflow chamber 22 to the other after airflow is introduced into the latter.

[0031] It is understood that the paddle 3 is partially located within the first airflow chamber 21 and at its outlet, and partially located within the second airflow chamber 22 and at its outlet. The remaining portion of the paddle 3 is located within the connecting channel 23. The outlet and inlet of the first airflow chamber 21 are adjacent, and the outlet and inlet of the second airflow chamber 22 are adjacent, facilitating the switching of the paddle 3 between the corresponding inlets and outlets of different airflow chambers. The paddle 3 and the cutter 4 are located at different positions in the first airflow chamber 21 and the second airflow chamber 22, and are independently configured. The paddle 3 does not actively move the cutter 4 during movement, and the cutter 4 does not actively move the paddle 3 during movement. Both move through the airflow between the first and second airflow chambers 21 and 22.

[0032] The lever 3 is used to selectively block the air inlet of the first airflow chamber 21 or the air inlet of the second airflow chamber 22, thereby selectively connecting the first air inlet channel 24 with the air inlet of the first airflow chamber 21 or the air inlet of the second airflow chamber 22. Since the first end of the lever 3 is located at the air outlet of the first airflow chamber 21 and the second end of the lever 3 is located at the air outlet of the second airflow chamber 22, the airflow flows in from the air inlet of any airflow chamber and then flows out through the corresponding air outlet. When the airflow flows out, the lever 3 is pushed and moved by the airflow, thereby enabling the lever 3 to connect to the airflow chamber currently receiving the airflow, and connecting the first air inlet channel 24 with the other airflow chamber to block it, thereby achieving the purpose of selectively pushing the tool 4 in different airflow chambers.

[0033] like Figure 3 and Figure 4 As shown, specifically, the paddle 3 has a vent 311. When the paddle 3 is in the first position, the connecting channel 23 is connected to the first airflow chamber 21 through the vent 311. When the paddle 3 is in the second position, the connecting channel 23 is connected to the second airflow chamber 22 through the vent 311.

[0034] The vent 311 provided on the lever 3 can selectively connect the connecting channel 23 to one of the first airflow chamber 21 and the second airflow chamber 22, while the lever 3 blocks the other of the first airflow chamber 21 and the second airflow chamber 22, ensuring that gas can enter the first airflow chamber 21 or the second airflow chamber 22.

[0035] In some embodiments, the power switching structure 2 also has an opening 25 facing the foreign object, the length extension direction of the opening 25 is in the same direction as the extension direction of the cutting structure, the first airflow chamber 21 and the second airflow chamber 22 are both in communication with the opening 25, the cutting part of the tool 4 is located in the opening 25, and the opening 25 can accommodate at least part of the foreign object.

[0036] One end of the cutter 4 is located at the connection between the first airflow chamber 21 and the opening 25, and the other end of the cutter 4 is located at the connection between the second airflow chamber 22 and the opening 25, so that the cutter can move back and forth between the first airflow chamber 21 and the second airflow chamber 22.

[0037] The opening 25 allows the blade 4 to be completely within the area enclosed by the power switching structure 2, thus avoiding the blade 4 protruding from the power switching structure 2 in order to make the blade 4 come into contact with the foreign object. This improves the overall compactness of the pneumatic cutting device. In addition, the opening 25 can also accommodate and limit the foreign object, preventing the foreign object from moving significantly relative to the blade 4 during the cutting process, thereby improving the cutting efficiency.

[0038] In some embodiments, the power switching structure 2 further includes a lifting part 26 for raising foreign objects, which is disposed at the opening 25.

[0039] The lifting section 26 is a wedge-shaped block, with the small end of the wedge facing the foreign object. The lifting section 26 is inclined, which allows it to push and lift the foreign object from the bottom during the movement of the power switching structure 2 toward the foreign object.

[0040] It is understandable that the power switching structure 2 is an integral structure, with an opening 25 in the power switching structure 2 to form a raised part 26. The vertical plane passing through the central axis of the power switching structure 2 in the length direction is set as the reference plane, and the projection of the opening 25 on the reference plane is a trapezoid.

[0041] like Figure 2 , Figures 8 to 10As shown, in some embodiments, the first airflow chamber 21 includes a first sub-inlet channel 211, a first outlet channel 212, and a first reversing channel 213. The first end of the first sub-inlet channel 211 is selectively connected to or disconnected from the vent 311. The second end of the first sub-inlet channel 211 is connected to the first end of the first reversing channel 213. The first end of the first outlet channel 212 is connected to the first sub-inlet channel 211. The connection between the first outlet channel 212 and the first sub-inlet channel 211 is located between the first end and the second end of the first outlet channel 212. The second end of the first outlet channel 212 is connected to the second end of the first reversing channel 213.

[0042] Specifically, the lever 3 selectively blocks or opens the inlet of the first sub-intake channel 211. After the lever 3 opens the inlet of the first sub-intake channel 211, the inlet of the second airflow chamber 22 is blocked by the lever 3. Gas enters the first sub-intake channel 211 through the vent 311 of the lever 3 and flows to the first end of the cutter 4. The cutter 4 moves towards the second airflow chamber 22 under the push of the airflow. Before the cutter 4 moves, the first end of the first reversing channel 213 (i.e., the inlet of the first reversing channel 213) is blocked by the cutter 4. After the cutter 4 moves a certain distance, the first end of the first reversing channel 213 is blocked. When the first end is opened, some airflow enters the first reversing channel 213 and first enters the first end of the first reversing channel 213. Then, guided by the first reversing channel 213, it flows to the second end of the first reversing channel 213 (that is, the outlet of the first reversing channel 213). The first end of the paddle 3 is located at the second end of the first reversing channel 213. Therefore, under the action of the airflow, the paddle 3 is pushed by the airflow to move towards the second airflow chamber 22. During the process of the cutter 4 moving towards the second airflow chamber 22, it will squeeze the residual gas in the second airflow chamber 22. The gas is squeezed out through the second airflow chamber 22.

[0043] like Figure 2 , Figures 8 to 10 As shown, in some embodiments, the second airflow chamber 22 includes a second sub-inlet channel 221, a second outlet channel 222, and a second reversing channel 223. The first end of the second sub-inlet channel 221 is selectively connected to or disconnected from the vent 311. The second end of the second sub-inlet channel 221 is connected to the first end of the second reversing channel 223. The first end of the second outlet channel 222 is connected to the second sub-inlet channel 221. The connection between the second sub-inlet channel 221 and the second outlet channel 222 is located between the first end of the second sub-inlet channel 221 and the second end of the second sub-inlet channel 221. The second end of the second outlet channel 222 is connected to the second end of the second reversing channel 223.

[0044] Specifically, the lever 3 selectively blocks or opens the inlet of the second sub-intake channel 221. After the lever 3 opens the inlet of the second sub-intake channel 221, the inlet of the first airflow chamber 21 is blocked by the lever 3. Gas enters the second sub-intake channel 221 through the vent 311 of the lever 3 and flows to the second end of the cutter 4. The cutter 4 moves towards the first airflow chamber 21 under the push of the airflow. Before the cutter 4 moves, the first end of the second reversing channel 223 (i.e., the inlet of the second reversing channel 223) is blocked by the cutter 4. After the cutter 4 moves a certain distance, the first end of the second reversing channel 223 (i.e., the inlet of the second reversing channel 223) is opened. After some airflow enters the second reversing channel 223, it flows to the first end of the second reversing channel 223, and then flows to the second end of the second reversing channel 223 (i.e., the outlet of the second reversing channel 223) under the guidance of the second reversing channel 223. The first end of the paddle 3 is located at the second end of the second reversing channel 223. Therefore, under the action of the airflow, the paddle 3 is pushed by the airflow to move towards the first airflow chamber 21. During the process of the cutter 4 moving towards the first airflow chamber 21, it will squeeze the residual gas in the first airflow chamber 21. The gas is squeezed through the first exhaust channel 212 and enters the first reversing channel 213. At this time, the gas enters the first reversing channel 213 and is discharged.

[0045] It should be noted that the paddle 3 is pushed by the airflow to move towards the second airflow chamber 22. During the process of moving towards the second airflow chamber 22, the cutter 4 will squeeze the residual gas in the second airflow chamber 22. The gas is squeezed out through the second airflow chamber 22, that is, the gas enters the second reversing channel 223 from the second exhaust channel 222 and is discharged through the second reversing channel 223.

[0046] During the cutting process, the above actions are repeated continuously. In this way, the blade 4 can move back and forth under the action of airflow, thereby achieving the purpose of cutting.

[0047] The first end of the first air intake channel 211 is the air inlet of the first airflow chamber 21, and the second end of the first reversing channel 213 is the air outlet of the first airflow chamber 21.

[0048] The first end of the second air intake channel 221 is the air inlet of the second airflow chamber 22, and the second end of the second reversing channel 223 is the air outlet of the second airflow chamber 22.

[0049] like Figure 2 , Figures 8 to 10As shown, in some embodiments, the second end of the first sub-intake channel 211 is disposed opposite to the second end of the second sub-intake channel 221, the first end of the cutter 4 is located in the first sub-intake channel 211, the second end of the cutter 4 is located in the second sub-intake channel 221, and the cutter 4 can selectively block the first end of the first reversing channel 213 or the first end of the second reversing channel 223.

[0050] Specifically, the first end of the cutting tool 4 enters the first sub-intake channel 211 through the second end of the first sub-intake channel 211, and the second end of the cutting tool 4 enters the second sub-intake channel 221 through the second end of the second sub-intake channel 221.

[0051] Since the second end of the first sub-intake channel 211 and the second end of the second sub-intake channel 221 are positioned opposite each other, and the first end of the cutter 4 is located in the first sub-intake channel 211 and the second end of the cutter 4 is located in the second sub-intake channel 221, the cutter 4 can reciprocate along its length. Furthermore, the cutter 4 selectively blocks the first end of the first reversing channel 213 or the first end of the second reversing channel 223, thereby compressing the gas in the corresponding airflow chamber to the outlet of the corresponding reversing channel, thus pushing the paddle 3. The paddle 3 reciprocates continuously under the push of the airflow, and the paddle 3 and the cutter 4 cooperate to achieve the purpose of cutting under the action of the airflow.

[0052] The first intake channel 211 includes a first working chamber, a second working chamber, a third working chamber, and a fourth working chamber connected in sequence. The first working chamber is perpendicular to the second working chamber, the third working chamber is perpendicular to the second working chamber, and the third working chamber is perpendicular to the fourth working chamber. The first working chamber and the third working chamber are parallel to each other, and the second working chamber and the fourth working chamber are parallel to each other. The first exhaust channel 212 is connected to the second working chamber, and the fourth working chamber is connected to the first reversing channel 213.

[0053] The second intake channel 221 has the same shape and structure as the first intake channel 211, and will not be described in detail here.

[0054] like Figure 2 , Figures 8 to 10 As shown, in some embodiments, the first airflow chamber 21 further includes a first exhaust channel 214, and the second airflow chamber 22 further includes a second exhaust channel 224. The first exhaust channel 214 connects the second end of the first reversing channel 213 to the outside atmosphere, and the second exhaust channel 224 connects the second end of the second reversing channel 223 to the outside atmosphere. The second exhaust channel 224 and the first exhaust channel 214 can be selectively blocked by the lever 3.

[0055] It should be noted that the second exhaust channel 224 and the first exhaust channel 214 can be selectively blocked by the lever 3 to prevent gas from entering the corresponding airflow chamber and being directly discharged into the corresponding exhaust channel. The arrangement of the second exhaust channel 224 and the first exhaust channel 214 ensures that the tool 4 moves at a uniform speed and maintains high-speed movement.

[0056] For example, the cross-sectional area of ​​the second exhaust channel 224 is smaller than the cross-sectional area of ​​the second reversing channel 223, which can prevent the gas in the second reversing channel 223 from being discharged too quickly, thus preventing the tool 4 from moving too fast. Similarly, the cross-sectional area of ​​the first exhaust channel 214 is smaller than the cross-sectional area of ​​the first reversing channel 213, which can prevent the gas in the first reversing channel 213 from being discharged too quickly, thus preventing the tool 4 from moving too fast.

[0057] Continue to refer to Figure 3 , Figure 4 , Figures 8 to 10 Specifically, the paddle shifter 3 has a blocking part 31 and a first limiting part 32. There are two first limiting parts 32, one at each end of the blocking part 31. The first limiting parts 32 are fixedly connected to the blocking part 31. One first limiting part 32 is located at the outlet of the first reversing channel 213, and the other is located at the outlet of the second reversing channel 223. The blocking part 31 is located within the connecting channel 23, and a vent 311 is formed on the blocking part 31. This allows the paddle shifter 3 to be limited within the first reversing channel 213 and the second reversing channel 223. For example, the paddle shifter 3 has a one-piece structure and a U-shaped structure.

[0058] The outlet cross-section of the first reversing channel 213 is a rectangular opening with a first end and a second end. The outlet cross-section of the second reversing channel 223 is also a rectangular opening with a first end and a second end. This provides sufficient space for the paddle 3 to move within the first reversing channel 213 and the second reversing channel 223.

[0059] For example, one of the first limiting parts 32 is located in the first airflow chamber 21. The first limiting part 32 moves within the first reversing channel 213. The first limiting part 32 can connect or disconnect the gas in the first reversing channel 213 from the first exhaust channel 214. The first reversing channel 213 includes a first working part and a first switching part. The first working part is connected to the first switching part. The cross-sectional area of ​​the first working part is smaller than the cross-sectional area of ​​the first switching part. The first limiting part 32 is located within the first switching part, and the first switching part provides a limit for the first limiting part 32 to prevent the first limiting part from entering the first working part. The cross-sectional area of ​​the first limiting part is the same as the cross-sectional area of ​​the first switching part, which can block the first switching part into two parts. The first exhaust channel 214 is connected to the first switching part.

[0060] Another first limiting part 32 is located within the second airflow chamber 22. This first limiting part 32 moves within the second reversing channel 223, enabling it to connect or disconnect the gas within the second reversing channel 223 from the second exhaust channel 224. The second reversing channel 223 includes a second working section and a second switching section, which are connected. The cross-sectional area of ​​the second working section is smaller than that of the second switching section. Another first limiting part 32 is located within the second switching section, and the second switching section provides a limit to the first limiting part 32, preventing it from entering the second working section. The area of ​​the large surface of the first limiting part 32 is the same as the area of ​​the vertical cross-section of the second switching section, thus effectively sealing the second switching section into two parts. The second exhaust channel 224 is connected to the second switching section.

[0061] For example, tool 4 is a saw blade, such as Figures 5 to 7 As shown, the cutting tool 4 has a working part 41 and a second limiting part 42. There are two second limiting parts 42. Each end of the working part 41 is connected to a second limiting part 42. One second limiting part 42 is located in the first sub-intake channel 211, and the other second limiting part 42 is located in the second sub-intake channel 221. In this way, the cutting tool 4 can be limited to prevent the cutting tool 4 from falling out of the driving force switching structure 2.

[0062] like Figure 2 As shown, in some embodiments, the cutting structure further includes an elastic limiting member 5, one end of which is fixedly connected to the channel wall of the first air intake channel 24 or the channel wall of the connecting channel 23, and the other end is fixedly connected to the paddle 3.

[0063] For example, the elastic limiting member 5 is a spring, the paddle 3 is fixedly connected to the other end of the spring, and the spring is fixedly connected to the channel wall of the first air intake channel 24 or the channel wall of the connecting channel 23. In this way, no matter whether the paddle 3 is in the first position or the second position, the paddle 3 will also be pulled by the spring when it is pushed by the airflow, thereby ensuring that the paddle 3 always has a tendency to move and avoiding insufficient airflow thrust.

[0064] like Figure 1As shown, the pneumatic cutting device also includes a stop airbag 6, which is fixedly connected to the power switching structure 2. Specifically, the two can be glued together or fixedly connected by fasteners. After the stop airbag 6 enters the working position, it is filled with gas and expands, serving to achieve an interference fit with adjacent structures (such as pipelines) and prevent the power switching structure 2 from moving during operation. The stop airbag 6 can stabilize the power switching structure 2 and reduce the vibration of the power switching structure 2 during operation. Since the stop airbag 6 is connected to the high-pressure air pressure regulating structure 1, the high-pressure air pressure regulating structure 1 supplies gas to the airbag, and the stop airbag 6 fills the pipeline space to stabilize the position of the power switching structure 2 and prevent the power switching structure 2 from vibrating during operation.

[0065] The high-pressure air pressure regulating structure 1 provides an air source for the stop airbag 6, and the two are connected by a flexible connecting pipe 7. The flexible connecting pipe 7 is equipped with an airbag switching valve 9.

[0066] For example, there are two flexible connecting pipes 7. One flexible connecting pipe 7 is used to connect the high-pressure air pressure regulating structure 1 and the power switching structure 2, and the other flexible connecting pipe 7 is used to connect the high-pressure air pressure regulating structure 1 and the stop airbag 6.

[0067] like Figures 8 to 10 As shown, a first limiting step 27 is provided in the first sub-intake channel 211, and a second limiting step 28 is provided in the second sub-intake channel 221. The first limiting step 27 is used to limit the position of the tool 4 in the first sub-intake channel 211, and the second limiting step 28 is used to limit the position of the tool 4 in the second sub-intake channel 221, preventing the tool 4 from moving out of position and disengaging from the power switching structure 2. The setting of the first limiting step 27 and the second limiting step 28 also allows the cutting edge of the tool 4 to be located more at the opening 25, thereby increasing the contact area between the tool and foreign objects.

[0068] like Figures 8 to 10 As shown, the working process of this pneumatic cutting device is as follows: 1. Send the power switching structure 2 to the location of the foreign object, and use an auxiliary camera to help place the power switching structure 2 on top of the foreign object; 2. After determining the position, open the airbag switch valve 9 to inflate the stop airbag 6. After inflation, the stop airbag 6 expands and presses against the heat transfer tubes, stabilizing the power switching structure 2 at the foreign object cutting position. Open the cutting switch valve 8 to start working. Since the initial position of the lever 3 is the first position, the connecting channel 23 is connected to the first airflow chamber 21. Gas enters the first airflow chamber 21 through the vent 311. The gas flows along the first airflow chamber 21 to the first end of the cutter 4 and pushes the cutter 4 to move towards the second airflow chamber 22. Since the cutter 4 is a long strip structure, the cutter 4 moves linearly. The cutter 4 moves to the first end of the second airflow chamber 22. The movement stops at the second limiting step 28. At this time, the inlet of the second reversing channel 223 is blocked by the cutter 4, the gas volume in the second airflow chamber 22 is compressed and the gas pressure increases. The gas in the second airflow chamber 22 flows out through the second exhaust channel 224. After the opening 25 of the first reversing channel 213 opens, the gas in the first sub-intake channel 211 enters the first reversing channel 213 and then gathers at the outlet of the first reversing channel 213. During this process, the first end of the lever 3 is located in the first reversing channel 213 and blocks the first exhaust channel 214. The airflow pushes the lever 3 to move within the first reversing channel 213. The first exhaust channel 214 is released by the movement of the lever 3. At this time, the vent 311 of the lever 3 is connected to the second intake channel 221. Gas enters the second airflow chamber 22 through the vent 311. The gas flows along the second airflow chamber 22 to the second end of the cutter 4 and pushes the cutter 4 towards the first airflow chamber 21. Since the cutter 4 is a long strip structure, the cutter 4 moves in a straight line. The cutter 4 stops moving at the first limit step 27. At this time, the first end of the first reversing channel 213 is blocked by the cutter 4. The gas volume in the first airflow chamber 21 is compressed and the gas pressure increases. The gas in the first airflow chamber 21 passes through the first exhaust channel 214. When the first exhaust passage 214 flows out, and the opening 25 of the second reversing passage 223 opens, the gas in the second sub-intake passage 221 enters the second reversing passage 223 and then gathers at the outlet of the second reversing passage 223. At this time, the second end of the lever 3 is located in the second reversing passage 223 and blocks the second exhaust passage 224. The airflow pushes the lever 3 to move in the second exhaust passage 224. The vent 311 of the lever 3 is connected to the first sub-intake passage 211. Thus, the tool 4 and the lever 3 cooperate to achieve reciprocating movement, thereby controlling the reversal of the airflow to ensure that the tool 4 reciprocates to achieve the cutting action. 3. The power switching structure 2 will perform a certain range of cutting under the action of gravity. If it fails to cut completely, the high-pressure air pressure regulating structure 1 will be turned off, the stop airbag 6 will be depressurized, and the cutting will be repeated after the power switching structure 2 falls back to the appropriate position. If the cutting position is too low, the stop airbag 6 will be depressurized, and the power switching structure 2 will continue to move forward. The foreign object will be raised to the position of the cutter 4 by the lifting part 26, and the cutting will continue until the foreign object is completely cut.

[0069] The pneumatic cutting device provided by this invention is used for cutting foreign objects between evaporator tubes. The pneumatic power provides strong power regardless of the distance of transmission. Some components of the power switching structure 2 are movable, while the stop airbag 6 is a fixed component. After the stop airbag 6 is inflated, it can fix the position of the power switching structure 2, which is fixedly connected to it, greatly reducing the failure rate and significantly improving its applicability.

[0070] Compared with existing foreign object grasping tools, the pneumatic cutting device provided by this invention has a simpler structure, smaller moving parts, reduced failure rate, and reduced risk of introducing new foreign objects during use.

[0071] The pneumatic cutting device provided by this invention has adjustable power levels based on air pressure, low path loss, and can provide sufficient power even at distant locations, which is a significant advantage over existing mechanical structures.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A pneumatic cutting device, comprising a high-pressure air pressure regulating structure (1), a power switching structure (2), and a cutting structure, characterized in that, The power switching structure (2) has a first airflow chamber (21) and a second airflow chamber (22). The first airflow chamber (21) and the second airflow chamber (22) are arranged opposite to each other. Both the first airflow chamber (21) and the second airflow chamber (22) are connected to the high-pressure air pressure regulating structure (1). The cutting structure is partially disposed in the first airflow chamber (21) and partially disposed in the second airflow chamber (22). The cutting structure can be pushed by the airflow in one of the airflow chambers (21 and 22) to move towards the other airflow chamber.

2. The pneumatic cutting device according to claim 1, characterized in that, The power switching structure (2) also has a connecting channel (23) and a first air intake channel (24). The connecting channel (23) is connected to the first air intake channel (24). The first end of the connecting channel (23) is connected to the first airflow chamber (21), and the second end of the connecting channel (23) is connected to the second airflow chamber (22).

3. The pneumatic cutting device according to claim 2, characterized in that, The cutting structure includes a cutting tool (4) and a lever (3). The lever (3) is movably connected to the power switching structure (2). The lever (3) has a first position and a second position. When the lever (3) is in the first position, the lever (3) blocks the air inlet of the first airflow chamber (21) and releases the air outlet of the first airflow chamber (21). When the lever (3) is in the second position, the lever (3) blocks the air inlet of the second airflow chamber (22) and releases the air outlet of the second airflow chamber (22). The cutting tool (4) is partially disposed in the second airflow chamber (22) and partially disposed in the first airflow chamber (21). The cutting tool (4) can move from one of the first airflow chamber (21) and the second airflow chamber (22) to the other after airflow is introduced into the other.

4. The pneumatic cutting device according to claim 3, characterized in that, The paddle (3) has a vent (311). When the paddle (3) is in the first position, the connecting channel (23) is connected to the first airflow chamber (21) through the vent (311). When the paddle (3) is in the second position, the connecting channel (23) is connected to the second airflow chamber (22) through the vent (311).

5. The pneumatic cutting device according to claim 3 or 4, characterized in that, The power switching structure (2) also has an opening (25) facing the foreign object. The length extension direction of the opening (25) is in the same direction as the extension direction of the cutting structure. The first airflow chamber (21) and the second airflow chamber (22) are both connected to the opening (25). The cutting part of the tool (4) is located in the opening (25). The opening (25) can accommodate at least part of the foreign object.

6. The pneumatic cutting device according to claim 5, characterized in that, The power switching structure (2) also has a lifting part (26) for raising foreign objects, which is located at the opening (25).

7. The pneumatic cutting device according to claim 3 or 4, characterized in that, The first airflow chamber (21) includes a first sub-inlet channel (211), a first outlet channel (212), and a first reversing channel (213). The first end of the first sub-inlet channel (211) is selectively connected to or disconnected from the vent (311) of the lever (3). The second end of the first sub-inlet channel (211) is connected to the first end of the first reversing channel (213). The first end of the first outlet channel (212) is connected to the first sub-inlet channel (211), and the connection between the first outlet channel (212) and the first sub-inlet channel (211) is located between the first end of the first outlet channel (212) and the second end of the first outlet channel (212). The second end of the first outlet channel (212) is connected to the second end of the first reversing channel (213); and / or, The second airflow chamber (22) includes a second sub-inlet channel (221), a second outlet channel (222), and a second reversing channel (223). The first end of the second sub-inlet channel (221) is selectively connected to or disconnected from the vent (311). The second end of the second sub-inlet channel (221) is connected to the first end of the second reversing channel (223). The first end of the second outlet channel (222) is connected to the second sub-inlet channel (221). The connection between the second sub-inlet channel (221) and the second outlet channel (222) is located between the first end of the second sub-inlet channel (221) and the second end of the second sub-inlet channel (221). The second end of the second outlet channel (222) is connected to the second end of the second reversing channel (223).

8. The pneumatic cutting device according to claim 7, characterized in that, The second end of the first sub-intake channel (211) is positioned opposite to the second end of the second sub-intake channel (221). The first end of the cutter (4) is located in the first sub-intake channel (211), and the second end of the cutter (4) is located in the second sub-intake channel (221). The cutter (4) can selectively block the first end of the first reversing channel (213) or the first end of the second reversing channel (223).

9. The pneumatic cutting device according to claim 7, characterized in that, The first airflow chamber (21) further includes a first exhaust channel (214), and the second airflow chamber (22) further includes a second exhaust channel (224). The first exhaust channel (214) connects the second end of the first reversing channel (213) to the outside atmosphere, and the second exhaust channel (224) connects the second end of the second reversing channel (223) to the outside atmosphere. The first exhaust channel (214) and the second exhaust channel (224) can be selectively blocked by the lever (3).

10. The pneumatic cutting device according to claim 3 or 4, characterized in that, The cutting structure further includes an elastic limiting member (5), one end of which is fixedly connected to the channel wall of the first air intake channel (24) or the channel wall of the connecting channel (23), and the other end is fixedly connected to the paddle (3); and / or, The cutting structure also includes a stop airbag (6), which is fixedly connected to one end of the power switching structure (2).

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