Nozzles for laser cutting equipment and laser cutting equipment

Abstract

This utility model belongs to the technical field of laser cutting equipment, and discloses a nozzle for laser cutting equipment and laser cutting equipment. The nozzle for laser cutting equipment includes an inner nozzle, an outer nozzle, and a movable inner core. The inner nozzle is provided with an inner flow channel and a first air guide hole, and the inlet end of the inner flow channel is used to introduce gas. The outer flow channel is sleeved outside the inner nozzle, and an outer flow channel is provided between the inner and outer nozzles. The outlet end of the outer flow channel is coaxially arranged with the outlet end of the inner flow channel. The movable inner core is movably disposed between the outer nozzle and the inner nozzle, and has a blocking position and a connecting position. When the movable inner core is in the blocking position, it can block the first air guide hole. When it is in the connecting position, the inner flow channel is connected to the outer flow channel through the first air guide hole. This utility model opens or blocks the first air guide hole by the movable inner core, realizing the connection or blocking of the inner and outer flow channels, thereby realizing gas outlet only in the inner flow channel or gas outlet in both the inner and outer flow channels simultaneously, and quickly adjusting the nozzle outlet diameter.

Description

Technical Field

[0001] This utility model relates to the field of laser cutting equipment technology, and in particular to a nozzle for laser cutting equipment and a laser cutting device. Background Technology

[0002] In laser cutting, air cutting and oxygen cutting differ significantly in nozzle selection due to the different functions and requirements of the gases. Air cutting typically requires higher gas pressure and flow rate to quickly remove molten material, therefore it often uses larger diameter nozzles to ensure a sufficient gas supply. Oxygen cutting, on the other hand, relies on oxidation reactions to assist cutting, requiring lower gas pressure and flow rate, and generally uses smaller diameter nozzles to match the lower gas flow rate.

[0003] Existing technologies typically employ an adjustment plate with multiple universal nozzles of different diameters inside the nozzle when different nozzles need to be replaced for different application scenarios. The nozzle diameter can be adjusted by moving the adjustment plate. However, this method requires realignment of the universal nozzles with the air passage during the adjustment process, resulting in relatively low operational efficiency.

[0004] Therefore, there is an urgent need for a nozzle for laser cutting equipment and a laser cutting device to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a nozzle for laser cutting equipment and a laser cutting equipment, so as to realize the rapid switching of nozzle application scenarios and improve processing efficiency.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] One aspect provides a nozzle for laser cutting equipment, comprising:

[0008] The inner nozzle is provided with an inner flow channel and a first air guide hole, wherein the inlet end of the inner flow channel is used to introduce gas;

[0009] An outer nozzle is sleeved outside the inner nozzle, and an outer flow channel is provided between the outer nozzle and the inner nozzle. The outlet end of the outer flow channel is coaxially arranged with the outlet end of the inner flow channel.

[0010] The movable inner core is movably disposed between the outer nozzle and the inner nozzle and has a blocking position and a connecting position. When the movable inner core is in the blocking position, the movable inner core blocks the first air guide hole. When the movable inner core is in the connecting position, the inner flow channel is connected to the outer flow channel through the first air guide hole.

[0011] Preferably, the movable inner core is provided with an air guide groove, and when the movable inner core is in the connected position, the outer flow channel is connected to the first air guide hole through the air guide groove.

[0012] Preferably, the air guide groove is annular and is located on the side of the movable inner core near the inner nozzle.

[0013] Preferably, the movable inner core is located on the side away from the outlet end of the outer flow channel, and a control flow channel is further provided between the inner nozzle and the outer nozzle. The control flow channel is configured to introduce gas to drive the movable inner core to move.

[0014] Preferably, the inner nozzle has multiple vent holes, through which gas is introduced into the control channel to drive the movement of the movable inner core.

[0015] Preferably, a sealing element is provided between the outer nozzle and the inner nozzle. The sealing element blocks the end of the control channel away from the movable inner core. A second air guide hole is provided on the inner nozzle. The second air guide hole connects the inner channel and the control channel to introduce gas into the control channel.

[0016] Preferably, the movable inner core includes a stop section and a connecting section, and a first sealing element is provided between the stop section and the outer wall of the inner flow channel in the third sealing.

[0017] The air guide groove is disposed in the connecting section;

[0018] A second seal is provided between the end of the connecting section away from the stop section and the outer wall of the inner nozzle.

[0019] Preferably, the system further includes a guide connector, which is fixed to the outer side wall of the inner nozzle and has a communication hole between it and the outer side wall of the inner nozzle; the movable inner core is sleeved on the guide connector and slidably connected to the guide connector; when the movable inner core is in the communication position, the air guide groove is connected to the outer flow channel through the communication hole.

[0020] Preferably, the movable inner core is provided with an elastic element, one end of which is connected to the movable inner core and the other end of which is connected to the outer nozzle; the movable inner core can compress the elastic element to connect the outer flow channel and the inner flow channel, and when the elastic element is reset, it can cause the movable inner core to block the first air guide hole.

[0021] On the other hand, a laser cutting device is provided, including a gas supply device and the above-mentioned laser cutting device nozzle, wherein the gas supply device is used to supply gas and is connected to the inlet end of the inner flow channel of the laser cutting device nozzle.

[0022] The beneficial effects of this utility model are:

[0023] The nozzle for laser cutting equipment provided by this utility model, by setting an outer nozzle and an inner nozzle, and setting a movable inner core between the inner nozzle and the outer nozzle, can open or block the first air guide hole of the inner flow channel, thereby realizing the connection or blockage between the outer flow channel and the inner flow channel. This allows the nozzle for laser cutting equipment to quickly adjust the nozzle outlet diameter by controlling the air to exit only through the inner flow channel or simultaneously through the inner and outer flow channels.

[0024] The laser cutting equipment provided by this utility model can adjust the nozzle outlet diameter without changing different nozzles, which greatly improves the adjustment efficiency of the nozzle outlet diameter and is conducive to improving processing efficiency. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the laser cutting nozzle during oxygen cutting provided in Embodiment 1 of this utility model;

[0026] Figure 2 This is a cross-sectional view of the laser cutting nozzle during air cutting provided in Embodiment 1 of this utility model;

[0027] Figure 3 This is a cross-sectional view of the laser cutting nozzle during oxygen cutting provided in Embodiment 2 of this utility model;

[0028] Figure 4 This is a cross-sectional view of the laser cutting nozzle during air cutting provided in Embodiment 2 of this utility model.

[0029] In the picture:

[0030] 1. Inner nozzle; 11. Inner flow channel; 12. First air guide hole; 13. Vent hole;

[0031] 2. Outer nozzle; 21. Outer flow channel; 22. First boss; 23. Second boss; 24. Guide connector;

[0032] 3. Movable inner core; 31. Air guide groove; 32. Stop section; 321. Third seal; 322. First seal; 33. Connecting section; 331. Second seal; 332. Fourth seal;

[0033] 41. Control flow channel; 42. Elastic element; 43. Second air guide hole. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] Example 1

[0039] like Figure 1 and Figure 2As shown, this embodiment provides a nozzle for a laser cutting device, including an inner nozzle 1, an outer nozzle 2, and a movable inner core 3. The inner nozzle 1 has an inner flow channel 11 and a first air guide hole 12, with the inlet end of the inner flow channel 11 for gas introduction. The outer nozzle 2 is sleeved outside the inner nozzle 1, and an outer flow channel 21 is provided between the outer nozzle 2 and the inner nozzle 1. The outlet end of the outer flow channel 21 is coaxially arranged with the outlet end of the inner flow channel 11. The movable inner core 3 is movably disposed between the outer nozzle 2 and the inner nozzle 1, having a blocking position and a connecting position. When the movable inner core 3 is in the blocking position, it blocks the first air guide hole 12; when it is in the connecting position, the inner flow channel 11 connects with the outer flow channel 21 through the first air guide hole 12.

[0040] The laser cutting equipment nozzle provided in this embodiment, by setting an outer nozzle 2 and an inner nozzle 1, and setting a movable inner core 3 between the inner nozzle 1 and the outer nozzle 2, can open or block the first air guide hole 12 at the opening of the inner flow channel 11, thereby realizing the connection or blockage between the outer flow channel 21 and the inner flow channel 11. This allows the laser cutting equipment nozzle to quickly adjust the nozzle outlet diameter by controlling the air to exit only through the inner flow channel 11, or by allowing the air to exit through both the inner flow channel 11 and the outer flow channel 21 simultaneously.

[0041] The movement of the movable inner core 3 includes, but is not limited to, the ability to move up and down relative to the inner nozzle 1 or rotate along its own axis. This is sufficient as long as it can open and close the first air guide hole 12.

[0042] For example, in this embodiment, the movable inner core 3 is provided with an air guide groove 31. When the movable inner core 3 is in the connected position, the outer flow channel 21 is connected to the first air guide hole 12 through the air guide groove 31.

[0043] More specifically, such as Figure 1 As shown, the air guide groove 31 is annular. The air guide groove 31 is located on the side of the movable inner core 3 near the inner nozzle 1. Multiple first air guide holes 12 are spaced apart around the inner nozzle. During oxygen cutting, the air guide groove 31 of the movable inner core 3 is directly opposite the first air guide holes 12, and the two ends of the air guide groove 31 are in contact with the outer wall of the inner nozzle, so that the gas in the inner flow channel 11 will not enter the outer flow channel 21. When it is necessary to switch to a large-diameter nozzle for air cutting, the movable inner core 3 is driven to move within the outer flow channel 21, thereby connecting the air guide groove 31 of the movable inner core 3 with the first air guide holes 12 and the outer flow channel 21. This allows some of the gas in the inner flow channel 11 to pass through the first air guide holes 12 and the air guide groove 31 in sequence before entering the outer flow channel 21, achieving simultaneous exhaust from the inner and outer flow channels 11 and increasing the cross-sectional area of ​​the nozzle.

[0044] Furthermore, such as Figure 1 and Figure 2As shown, on the side of the movable inner core 3 away from the outlet end of the outer flow channel 21 (i.e., above the movable inner core 3 in this embodiment), a control flow channel 41 is also provided between the inner nozzle 1 and the outer nozzle 2. Gas can be introduced into the control flow channel 41 to drive the movable inner core 3 to move.

[0045] Specifically, such as Figure 1 and Figure 2 As shown, the inner nozzle 1 has multiple vent holes 13. Gas is introduced into the control channel 41 through the vent holes 13 to drive the movement of the movable inner core. It can be understood that the nozzle for the laser cutting equipment provided in this embodiment, by setting a control channel above the movable inner core 3 and connecting other gas paths through the vent holes 13 to introduce gas into the control channel 41, causes the movable inner core 3 to move downward under the push of the gas, thereby placing the movable inner core 3 in the connected position. Part of the gas in the inner channel 11 can pass through the first air guide hole 12 and the air guide groove 31 in sequence and enter the outer channel 21, realizing simultaneous exhaust of the inner channel 11 and the outer channel 21.

[0046] Furthermore, in this embodiment, the movable inner core 3 includes a stop section 32 and a connecting section 33. A first sealing element 322 is provided between the third sealing stop section 32 and the outer wall of the inner flow channel 11. A gas guide groove 31 is provided in the connecting section 33. A second sealing element 331 is provided between the end of the connecting section 33 away from the stop section 32 and the outer wall of the inner nozzle 1. By providing the third sealing first sealing element 322 and the second sealing element 331, the movable inner core 3 and the inner nozzle 1 can be sealed together, ensuring that when the movable inner core 3 is in the blocked position, the gas entering the gas guide groove 31 through the first gas guide hole 12 will not flow out from the outlet end of the outer flow channel 21, thus ensuring the cutting quality during oxygen cutting.

[0047] The first seal 322 and the second seal 331 can be disposed on the outer wall of the inner flow channel 11 or on the inner wall of the movable inner core 3. The key is to ensure that the inner nozzle 1 of the movable inner core 3 is sealed when the movable inner core 3 moves. Specifically, as shown in the figure, in this embodiment, a first sealing groove is provided on the inner wall of the stop section 32, and the first seal 322 is disposed within the first sealing groove. A second sealing groove is provided on the inner wall of the connecting section 33, and the second seal 331 is disposed within the second sealing groove.

[0048] Furthermore, to prevent some gas from passing through the movable inner core 3 and being discharged through the outer flow channel 21 when gas is introduced into the control flow channel 41 through the air guide hole to drive the movable inner core 3, a third seal 321 is provided between the stop section 32 and the inner wall of the outer nozzle 2, and a fourth seal 332 is provided between the connecting section 33 and the inner wall of the outer nozzle 2. Specifically, as shown... Figure 1 and Figure 2As shown, in this embodiment, a third sealing groove is provided on the outer wall of the stop section 32, and a third sealing member 321 is disposed in the third sealing groove. A fourth sealing groove is provided on the inner wall of the outer nozzle 2, and a fourth sealing member 332 is disposed in the fourth sealing groove and abuts against the connecting section 33 of the movable inner core 3. It can be understood that by providing the third sealing member 321 and the fourth sealing member 332, both ends of the movable inner core 3 can be sealed and fitted with the inner wall of the outer nozzle 2. On the one hand, this allows the gas entering the control channel 41 to be better concentrated, which facilitates the movement of the movable inner core 3. On the other hand, it can prevent the gas from entering the outer channel 21 through the gap between the movable inner core 3 and the outer nozzle 2, thus avoiding the influence of the gas pressure and flow rate of the outer channel 21, and effectively ensuring the jet quality of the outer channel 21. In some embodiments, in order to improve the switching speed between oxygen cutting and air cutting, an elastic member 42 is provided on the movable inner core 3. One end of the elastic member 42 is connected to the movable inner core 3, and the other end is connected to the outer nozzle 2. The movable inner core 3 can compress the elastic element 42 to connect the outer flow channel 21 and the inner flow channel 11. When the elastic element 42 resets, it can cause the movable inner core 3 to block the first air guide hole 12. With this configuration, during the process of the control drive moving the movable inner core 3 from the position of blocking the first air guide hole 12 to the position of opening the first air guide hole 12, the movable inner core 3 can compress the elastic element 42. When the control drive no longer provides driving force to the movable inner core 3, the movable inner core 3 can move to the position of blocking the first air guide hole 12 in a timely manner under the elastic restoring force of the elastic element 42. This configuration provides sufficient response time for the movable inner core 3, improving the nozzle size switching speed.

[0049] The elastic element 42 includes, but is not limited to, a spring. In this embodiment, the elastic element 42 is a spring, which is sleeved on the outside of the connecting section 33. Along the radial direction of the outer flow channel 21, the size of the connecting section 33 is smaller than the size of the stop section 32, that is, the connecting section 33 leaves space in the outer flow channel 21, which facilitates the installation of the elastic element 42. The position of the stop section 32 protruding radially relative to the connecting section 33 can abut against the first end of the elastic element 42, and the second end of the elastic element 42 abuts against the first protrusion 22 provided on the inner sidewall of the outer nozzle 2, so that when the movable inner core 3 is not pushed, it can move upward relative to the outer nozzle 2 under the action of the elastic restoring force of the elastic element 42 to re-seal the first air guide hole 12.

[0050] In this embodiment, as Figure 1As shown, a second protrusion 23 is provided in the outer flow channel 21. The second protrusion 23 is below the first protrusion 22 and can abut against the end of the connecting section 33 of the movable inner core 3 away from the stop section 32. It can be understood that during the process of the movable inner core 3 moving downward to open the first air guide hole 12, the end of the connecting section 33 of the movable inner core 3 away from the stop section 32 can abut against the second protrusion 23 in the outer flow channel 21. By limiting the movable inner core 3 through the second protrusion 23, it can be ensured that the air guide groove 31 can ensure the connection between the first air guide hole 12 and the outer flow channel 21, while also preventing the movable inner core 3 from moving too much in the outer flow channel 21, which would cause the upper surface of the movable inner core 3 to be lower than the first air guide hole 12, thus preventing the gas passing through the first air guide hole 12 from entering the space above the movable inner core 3.

[0051] Furthermore, a guide connector 24 is provided inside the outer flow channel 21. The guide connector 24 is fixed to the outer wall of the inner nozzle 1 and has a connecting hole between it and the outer wall of the inner nozzle 1. The movable inner core 3 is sleeved on the guide connector 24 and slidably connected to it. When the movable inner core 3 is in the connected position, the air guide groove 31 is connected to the outer flow channel 21 through the connecting hole. It can be understood that the inner nozzle 1 gradually narrows along the extension direction of the inner flow channel 11. The guide connector 24 is roughly annular and is fixedly connected to the outer wall of the inner nozzle 1 by internal ribs and spaced apart from the first air guide hole 12. The connecting section 33 of the movable inner core 3 can move between the inner wall of the outer nozzle 2 and the outer wall of the guide connector 24. When the movable inner core 3 moves to the position where the first air guide hole 12 is opened, part of the gas in the inner flow channel 11 can be discharged along the outer flow channel after passing through the first air guide hole 12, the air guide groove 31, and the connecting hole. The guide connector 24 can further guide the movement of the movable inner core 3, thereby improving the movement efficiency of the movable inner core 3 and thus increasing the switching speed of the nozzle outlet diameter cross-sectional area.

[0052] This embodiment also provides a laser cutting device, including a gas supply device and the aforementioned laser cutting device nozzle. The gas supply device is used to supply gas and is connected to the inlet end of the inner flow channel 11 of the laser cutting device nozzle. The laser cutting device provided in this embodiment allows for adjustment of the nozzle outlet diameter without changing different nozzles, greatly improving the adjustment efficiency of the nozzle outlet diameter and thus contributing to increased processing efficiency.

[0053] Example 2

[0054] Figure 3 and Figure 4Embodiment 2 is shown, wherein the same or corresponding components as in Embodiment 1 are represented by the same reference numerals as in Embodiment 1. For simplicity, only the differences between Embodiment 2 and Embodiment 1 are described. The difference is that, in order to reduce the number of gas passages, a sealing element is provided between the outer nozzle 2 and the inner nozzle 1. The sealing element blocks the end of the control flow channel 41 away from the movable inner core 3. A second air guide hole 43 is provided on the inner nozzle 1, which connects the inner flow channel 11 and the control flow channel 41 to introduce gas into the control flow channel 41.

[0055] Understandably, the second vent 43 is located upstream of the first vent 12. During oxygen cutting, the gas pressure entering the inner flow channel 11 is relatively low. After entering the control flow channel 41 through the second vent 43, it cannot push the movable inner core 3 to move, and the first vent 12 remains blocked. When air cutting is required, the gas pressure entering the inner flow channel 11 is relatively high. It can pass through the second vent 43 into the control flow channel 41 above the movable inner core 3 and push the movable inner core 3 to move, thereby opening the first vent 12. This allows the gas in the inner flow channel 11 to be discharged simultaneously through both the inner flow channel 11 and the outer flow channel 21.

[0056] Of course, in some other embodiments, a valve can be provided on the second air guide hole 43 to control the opening and closing of the second air guide hole 43.

[0057] Example 3

[0058] For simplicity, only the differences between Embodiment 3 and Embodiment 1 are described. The difference lies in the fact that the movable inner core 3 can be moved by a control component. The control component can be a component capable of controlling the movement of other parts, such as a telescopic cylinder, a drive motor, or a solenoid valve. Taking a telescopic cylinder as an example, the output end of the cylinder is connected to the movable inner core 3. During oxygen cutting, the telescopic cylinder does not work, and the movable inner core 3 blocks the first air guide hole 12, with only the inner flow channel 11 emitting air. When it is necessary to switch to air cutting, the telescopic cylinder controls the movable inner core 3 to move, opening the first air guide hole 12, so that a portion of the air entering the inner flow channel 11 can enter the outer flow channel 21 through the first air guide hole 12 and the air guide groove 31 on the movable inner core 3, achieving simultaneous exhaust from the outer flow channel 21 and the inner flow channel 11, which are concentrically arranged at the outlet end, thus increasing the cross-sectional area of ​​the nozzle.

[0059] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. 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 this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A nozzle for a laser cutting apparatus, characterized by, include: The inner nozzle (1) is provided with an inner flow channel (11) and a first air guide hole (12), and the inlet end of the inner flow channel (11) is used to introduce gas; An outer nozzle (2) is sleeved outside the inner nozzle (1). An outer flow channel (21) is provided between the outer nozzle (2) and the inner nozzle (1). The outlet end of the outer flow channel (21) is coaxially arranged with the outlet end of the inner flow channel (11). The movable inner core (3) is movably disposed between the outer nozzle (2) and the inner nozzle (1) and has a blocking position and a connecting position. When the movable inner core (3) is in the blocking position, the movable inner core (3) blocks the first air guide hole (12). When the movable inner core (3) is in the connecting position, the inner flow channel (11) is connected to the outer flow channel (21) through the first air guide hole (12).

2. The nozzle for laser cutting equipment according to claim 1, characterized in that, The movable inner core (3) is provided with an air guide groove (31). When the movable inner core (3) is in the connected position, the outer flow channel (21) is connected to the first air guide hole (12) through the air guide groove (31).

3. The nozzle for laser cutting apparatus according to claim 2, characterized by The air guide groove (31) is annular and is located on the side of the movable inner core (3) near the inner nozzle (1).

4. The nozzle for laser cutting equipment according to claim 2, characterized in that, The movable inner core (3) is located away from the outlet end of the outer flow channel (21). A control flow channel (41) is also provided between the inner nozzle (1) and the outer nozzle (2). The control flow channel (41) is configured to introduce gas to drive the movable inner core (3) to move.

5. The nozzle for laser cutting apparatus according to claim 4, characterized by The inner nozzle (1) has multiple vent holes (13) through which gas is introduced into the control channel (41) to drive the movable inner core (3) to move.

6. The nozzle for laser cutting equipment according to claim 4, characterized in that, A sealing element is also provided between the outer nozzle (2) and the inner nozzle (1). The sealing element blocks the end of the control channel (41) away from the movable inner core (3). A second air guide hole (43) is provided on the inner nozzle (1). The second air guide hole (43) connects the inner channel (11) and the control channel (41) to introduce gas into the control channel (41).

7. The nozzle for laser cutting equipment according to claim 2, characterized in that, The movable inner core (3) includes a stop section (32) and a connecting section (33), and a first sealing element (322) is provided between the stop section (32) and the outer wall of the inner flow channel (11). The air guide groove (31) is provided in the connecting section (33); A second seal (331) is provided between the end of the connecting section (33) away from the stop section (32) and the outer wall of the inner nozzle (1).

8. The nozzle for laser cutting equipment according to any one of claims 2-7, characterized in that, It also includes a guide connector (24), which is fixed to the outer side wall of the inner nozzle (1) and has a communication hole between it and the outer side wall of the inner nozzle (1); the movable inner core (3) is sleeved on the guide connector (24) and slidably connected to the guide connector (24); when the movable inner core (3) is in the communication position, the air guide groove (31) and the outer flow channel (21) are connected through the communication hole.

9. The nozzle for laser cutting equipment according to any one of claims 1-7, characterized in that, The movable inner core (3) is provided with an elastic element (42), one end of which is connected to the movable inner core (3) and the other end is connected to the outer nozzle (2). The movable inner core (3) can compress the elastic element (42) to connect the outer flow channel (21) and the inner flow channel (11). When the elastic element (42) is reset, the movable inner core (3) can block the first air guide hole (12).

10. A laser cutting device, characterized in that, It includes a gas supply device and a nozzle for laser cutting equipment as described in any one of claims 1-9, wherein the gas supply device is used to supply gas and is connected to the inlet end of the inner flow channel (11) of the nozzle for laser cutting equipment.

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