Auxiliary device of plasma cutting gun and using method of plasma cutting gun

Abstract

The invention relates to an auxiliary device of a plasma cutting gun and a using method of the plasma cutting gun. The device comprises a laser ranging assembly and a vertical telescopic assembly which are installed on a gun head through an annular connecting piece. The laser ranging assembly detects the distance between the gun head and a workpiece in real time, and the controller drives the vertical telescopic assembly to ascend and descend according to a signal, so that the height of the gun head is dynamically adjusted, and the cutting distance is stably kept within a preset range; the device is further provided with a cutting track monitoring assembly which can automatically stop when a cutting path deviates from a preset track. Automatic closed-loop control over the cutting height and path is achieved, the quality problems of nozzle burning, incomplete cutting or deviation and the like can be effectively avoided, and the cutting precision, the working efficiency and the operation safety are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of metal processing, and in particular to an auxiliary device for a plasma cutting gun and a method for using a plasma cutting gun. Background Technology

[0002] Plasma cutting technology, thanks to the thermal melting effect of its high-energy plasma arc, is widely used in metal processing, especially in cutting complex structural parts such as vehicle frames and bodies. However, traditional plasma cutting operations, especially handheld or semi-automatic modes, have long suffered from two major pain points that severely restrict cutting quality, efficiency, and cost control.

[0003] First, precise control of the cutting distance is highly dependent on human experience. The stability of the plasma arc and the cutting quality are closely related to the distance between the nozzle and the workpiece surface. If the distance is too far, the plasma arc energy will dissipate, the cutting ability will decrease, and defects such as incomplete melting and slag buildup will occur. If the distance is too close, it is very easy to cause a short circuit or double arc phenomenon between the nozzle and the workpiece, which will not only instantly burn out the expensive nozzle and electrode, but may also damage the surface of the base material. In actual operation, the unevenness of the workpiece surface, the operator's hand tremors, and the thermal deformation during the cutting process all make it extremely difficult to maintain a constant optimal cutting distance (usually between 1-3 mm).

[0004] Secondly, accurate tracking of the cutting path presents a challenge. When cutting complex contours or long straight lines, the operator must move the cutting gun along pre-drawn marked lines (such as black painted lines). Due to visual fatigue, human error, or interference from workpiece reflections, path deviation is highly likely to occur. Once the path deviates from the preset trajectory, it will lead to material waste and product scrap. Existing solutions mostly focus on large CNC machine tools, and there is a lack of real-time, lightweight path correction assistance methods for handheld or portable devices. Summary of the Invention

[0005] This application provides a plasma cutting gun auxiliary device and a method for using a plasma cutting gun to solve the technical problem in the related art where the cutting distance of a handheld plasma cutting gun depends on human experience, resulting in incomplete melting or short circuit between the cutting gun and the workpiece.

[0006] In a first aspect, a plasma cutting gun auxiliary device is provided, comprising: Annular connector, used for coaxial mounting on the outside of the plasma cutting torch head; A vertical telescopic assembly is mounted on the annular connector and located downstream of the cutting path; the bottom of the vertical telescopic assembly is coaxial and rotatably connected to a vertical rod, and the bottom of the vertical rod is connected to a contact guide wheel of the workpiece to be cut; A laser ranging component is mounted on the annular connector and located upstream of the cutting path. The vertical telescopic component and the laser ranging component are located on the same diameter of the annular connector. The controller is used to control the vertical telescopic assembly to extend or shorten based on the distance between the laser rangefinder and the workpiece being cut, as detected by the laser rangefinder.

[0007] Preferably, the annular connector is provided with a first mounting block and a second mounting block in the upstream and downstream directions of the cutting path, respectively; the laser ranging component is mounted on the first mounting block; and the second mounting block is provided with a vertical through hole. The vertical telescopic assembly includes a telescopic element installed on the top surface of the second mounting block. A first connecting rod is connected to the telescopic end of the telescopic element and is arranged perpendicular to its telescopic direction. A second connecting rod is connected to the end of the first connecting rod away from the telescopic element and is parallel to the telescopic direction. The second connecting rod is vertically provided with a vertical through hole and is rotatably connected to the vertical rod.

[0008] Preferably, the annular connector is provided with a first mounting block and a second mounting block in the upstream and downstream directions of the cutting path, respectively; the laser ranging component is mounted on the first mounting block; and the second mounting block is provided with a vertical through hole. The vertical telescopic assembly includes a telescopic element, which is installed in the vertical through hole, and its telescopic end passes through the vertical through hole and is rotatably connected to the vertical rod.

[0009] Preferably, there are two vertical telescopic components; each of the two vertical rods corresponding to the two vertical telescopic components is equipped with a cutting trajectory monitoring component; during cutting, the two cutting trajectory monitoring components are located on both sides of the width direction of the preset black cutting route.

[0010] The controller is also connected to the cutting trajectory monitoring component and is used to control the plasma cutting gun to stop working when the cutting trajectory monitoring component detects that the cutting trajectory has deviated.

[0011] Preferably, the cutting trajectory monitoring component includes an infrared transmitter, an infrared receiver, and an anomaly detection unit; The infrared emitter is used to emit infrared light onto the surface of the workpiece being cut; the infrared receiver is used to receive the reflected infrared light. The anomaly detection unit is used to output an abnormal signal when the reflected infrared light is less than a set threshold, and to output a normal signal when the reflected infrared light is greater than the set threshold.

[0012] Preferably, the cutting trajectory monitoring component is provided with a light-shielding and heat-insulating cover on the outer side near the laser ranging component.

[0013] Preferably, the annular connector includes two hinged semi-circular clamping blocks, each of which has a second mounting block at the end away from the hinge; the two second mounting blocks are connected by screws to form a complete clamp structure.

[0014] Preferably, the semi-circular clamping block has a rubber pad on its inner wall that contacts the outer side of the gun head.

[0015] Secondly, a method for using a plasma cutting torch is provided, which includes: Install the plasma cutting gun auxiliary device onto the head of the plasma cutting gun, then make contact between the workpiece contact guide wheel and the workpiece, then align the gun head with the preset black cutting line and cut along the extension direction of the preset black cutting line. During the cutting process, when the distance between the laser rangefinder and the workpiece being cut, as detected by the laser rangefinder, exceeds the maximum value of a preset range, the vertical telescopic component is shortened by the controller to bring the distance within the preset range. When the distance between the laser rangefinder and the workpiece being cut, as detected by the laser rangefinder, is less than the minimum value of a preset range, the vertical telescopic component is extended by the controller to bring the distance within the preset range.

[0016] Preferably, there are two vertical telescopic components; each of the two vertical rods corresponding to the two vertical telescopic components is equipped with a cutting trajectory monitoring component; during cutting, the two cutting trajectory monitoring components are located on both sides of the width direction of the preset black cutting route.

[0017] The controller is also connected to the cutting trajectory monitoring component and is used to control the plasma cutting gun to stop working when the cutting trajectory monitoring component detects that the cutting trajectory has deviated. The cutting trajectory monitoring component includes an infrared emitter, an infrared receiver, and an anomaly detection unit; the infrared emitter is used to emit infrared light onto the surface of the workpiece being cut; the infrared receiver is used to receive the reflected infrared light; the anomaly detection unit is used to output an abnormal signal when the reflected infrared light is less than a set threshold, and to output a normal signal when the reflected infrared light is greater than the set threshold. When at least one cutting trajectory monitoring component outputs an abnormal signal, the controller determines the risk of cutting trajectory deviation and controls the plasma cutting gun to stop cutting.

[0018] The beneficial effects of the technical solution provided in this application include: This application provides an auxiliary device for a plasma cutting gun and a method for using the plasma cutting gun. It is installed on the outside of the cutting gun head via a ring connector, requiring no modification to the gun body and offering high versatility. Its core is the coordinated control of a laser ranging component and a vertical telescopic component: the laser ranging component is located upstream, detecting the distance to the workpiece in real time without contact; the vertical telescopic component is located downstream, with its bottom contact guide wheel always in rolling contact with the workpiece surface, providing support and serving as a height reference. The controller continuously receives the laser ranging signal and compares it with a preset threshold. Once a distance deviation is detected, the vertical telescopic component is immediately activated: if the distance is too large, the gun head shortens and depresses; if the distance is too small, the gun head extends and rises, forming a real-time closed-loop control that can quickly respond to workpiece surface undulations, controlling the gun head-workpiece distance fluctuation within extremely small tolerances. This not only ensures stable plasma arc energy and obtains a high-quality cutting surface, but also effectively prevents the nozzle from burning out due to contact with the workpiece, significantly reducing consumable costs and rework rates. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a handheld plasma cutting gun provided in an embodiment of this application; Figure 2 A three-dimensional structural diagram of the plasma cutting gun auxiliary device provided in the embodiments of this application. Figure 1 ; Figure 3 A three-dimensional structural diagram of the plasma cutting gun auxiliary device provided in the embodiments of this application. Figure 2 .

[0021] In the figure: 1. Annular connector; 100. First mounting block; 101. Second mounting block; 2. Vertical telescopic assembly; 200. Telescopic element; 201. First connecting rod; 202. Second connecting rod; 3. Laser ranging assembly; 4. Contact guide wheel of the workpiece to be cut; 5. Vertical rod; 6. Cutting trajectory monitoring assembly. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] This application provides a plasma cutting gun auxiliary device and a method for using a plasma cutting gun. It can solve the problem of how to provide a compact and easy-to-install integrated auxiliary device for plasma cutting guns, so as to realize the automated and high-precision real-time adjustment of the distance between the gun head and the workpiece during the cutting process, thereby replacing the highly controlled mode that relies entirely on human experience, and fundamentally avoiding the problems of unstable cutting quality and nozzle wear caused by improper distance.

[0024] refer to Figures 1-3 As shown, a plasma cutting gun auxiliary device includes: Annular connector 1, which is used for coaxial mounting on the outside of the head of the plasma cutting gun; Figure 1 - This is a plasma cutting torch, where the mark A is the torch head; The vertical telescopic component 2 is mounted on the annular connector 1 and is located downstream of the cutting path; the bottom of the vertical telescopic component 2 is coaxial and rotatably connected to a vertical rod 5, and the bottom of the vertical rod 5 is connected to a contact guide wheel 4 of the part being cut; The laser ranging component 3 is mounted on the annular connector 1 and is located upstream of the cutting path. The vertical telescopic component 2 and the laser ranging component 3 are located on the same diameter of the annular connector 1. The controller is used to control the vertical telescopic component 2 to extend or shorten based on the distance between the laser rangefinder component 3 and the workpiece being cut.

[0025] This device is directly mounted on the outside of the cutting gun head via a ring connector 1, achieving physical integration of the auxiliary device and the working tool. It requires no modification to the cutting gun body, offering strong versatility and convenient installation. Its core lies in the coordinated layout and linkage control of the laser ranging component 3 and the vertical telescopic component 2. The laser ranging component 3, located upstream of the cutting path, can accurately detect the distance information of the workpiece surface in front of the gun head in real time and without contact, before the actual point of action of the plasma arc. The vertical telescopic component, located downstream, has a bottom-mounted guide wheel that always rolls in contact with the workpiece surface, providing both movement support and a reliable height reference point.

[0026] The upstream and downstream here do not define the direction of movement during cutting, but are only used to characterize the connection relationship of their structural positions.

[0027] A dynamic, balanced mechanical-control closed loop is formed: the controller continuously receives real-time distance signals from the upstream laser ranging component and compares them with a preset optimal cutting distance threshold. Once the actual distance deviates from the threshold range, the controller immediately drives the vertical telescopic component—shortening it when the distance is too large, pressing the nozzle down; and extending it when the distance is too small, raising the nozzle. This adjustment process rapidly changes the nozzle's height relative to the workpiece using a lever principle with the contact guide wheel as the fulcrum. Maintaining the cutting distance is transformed from an open, lagging manual judgment operation to a closed, real-time automatic feedback control, capable of instantaneously responding to microscopic unevenness on the workpiece surface and controlling the nozzle-workpiece distance fluctuation within a very small tolerance range. This not only ensures stable plasma arc energy output and obtains a uniform, high-quality cut surface, but more importantly, it effectively prevents the nozzle from burning out due to accidental contact with the workpiece, significantly reducing consumable costs and minimizing rework due to incomplete cuts.

[0028] In some preferred embodiments, the annular connector 1 is provided with a first mounting block 100 and a second mounting block 101 in the upstream and downstream directions of the cutting path, respectively; the laser ranging component 3 is mounted on the first mounting block 100; and the second mounting block 101 is provided with a vertical through hole. The vertical telescopic assembly 2 includes a telescopic element 200 installed on the top surface of the second mounting block 101. A first connecting rod 201 is connected to the telescopic end of the telescopic element 200 and is arranged perpendicular to its telescopic direction. A second connecting rod 202 is connected to the end of the first connecting rod 201 away from the telescopic element 200 and is parallel to the telescopic direction. The second connecting rod 202 is vertically provided with a vertical through hole and is rotatably connected to the vertical rod 5.

[0029] By arranging the telescopic element 200 on the side of the gun head, the overall height and center of gravity of the device are lowered, making the entire auxiliary device more flat and compact, and reducing the possibility of interference when operating in confined spaces or at complex angles. Through the rigid connection of the first and second connecting rods, the linear motion of the telescopic element 200 is precisely and without delay converted into vertical motion. The transmission path is clear, the mechanical response is fast, and the backlash and errors that may be caused by using complex gears or connecting rods are avoided. The technical benefits of this design are: while ensuring the reliable implementation of the automatic height adjustment function, it significantly improves the mechanical stability and environmental adaptability of the auxiliary device, enabling it to work stably for a long time in harsh industrial environments, while maintaining the overall lightweight nature of the device and not placing excessive additional burden on the operator.

[0030] In some preferred embodiments, the annular connector 1 is provided with a first mounting block 100 and a second mounting block 101 in the upstream and downstream directions of the cutting path, respectively; the laser ranging component 3 is mounted on the first mounting block 100; and the second mounting block 101 is provided with a vertical through hole. The vertical telescopic assembly 2 includes a telescopic element 200, which is installed in a vertical through hole, and its telescopic end passes through the vertical through hole and is rotatably connected to the vertical rod 5.

[0031] An alternative simplified structural solution for the vertical telescopic component 2 is provided, with this direct-drive design eliminating intermediate transmission links. The telescopic movement of the telescopic element and the lifting movement of the contact guide wheel are axially coaxial, achieving one-to-one direct drive. The structure is extremely simple, with fewer parts, reducing manufacturing complexity and potential failure points; secondly, the transmission rigidity is enhanced. Due to the absence of lever switching, the system's mechanical hysteresis and elastic deformation are smaller, resulting in a more direct and precise response to control signals; space utilization is efficient, although the overall height may increase slightly, the lateral dimensions are more compact. This helps maintain a constant cutting distance during high-speed movement, further optimizing the perpendicularity and smoothness of the cutting edge.

[0032] In some preferred embodiments, there are two vertical telescopic components 2; each of the two vertical rods 5 corresponding to the two vertical telescopic components 2 is provided with a cutting trajectory monitoring component 6; during cutting, the two cutting trajectory monitoring components 6 are located on both sides of the width direction of the preset black cutting route.

[0033] The controller is also connected to the cutting trajectory monitoring component 6 and is used to control the plasma cutting gun to stop working when the cutting trajectory monitoring component 6 detects that the cutting trajectory has deviated.

[0034] This solution addresses the industry pain point of handheld cutting easily deviating from the preset trajectory. It sets up two vertical telescopic components 2 and a corresponding cutting trajectory monitoring component 6, and arranges them symmetrically on both sides of the preset black cutting route during cutting.

[0035] Two cutting trajectory monitoring components 6 independently monitor the optical properties of the workpiece surface below them. When the cutting torch moves strictly along the center of the black marked line, both monitoring components should be located above the bright metal workpiece surface, receiving a strong reflected signal, which the system considers normal. If an operational deviation occurs, causing one of the trajectory monitoring components 6 to move above the black marked line, the reflected signal received by that component will drastically decrease to below a set threshold due to the strong absorption of light by black. At this point, the anomaly detection unit will output an anomaly signal. Upon receiving either anomaly signal, the controller determines that the cutting trajectory has deviated and immediately triggers the safety mechanism, stopping the plasma cutting torch from operation.

[0036] It achieves real-time, non-contact path correction and early warning during the cutting process. It essentially provides the operator with an invisible electronic guide; if the operator's hand movements deviate from the correct path, the system can instantly detect it and automatically stop the machine, preventing large-scale scrap and material loss due to continuous off-center cutting. This significantly reduces the need for sustained operator focus, alleviating workload. Especially when cutting long distances and complex curves, it significantly improves the success rate of the first cut and overall operational efficiency, serving as a core guarantee for achieving high-precision handheld cutting.

[0037] In some preferred embodiments, the cutting trajectory monitoring component 6 includes an infrared transmitter, an infrared receiver, and an anomaly detection unit; An infrared emitter is used to emit infrared light onto the surface of the workpiece being cut; an infrared receiver is used to receive the reflected infrared light. The anomaly detection unit is used to output an abnormal signal when the reflected infrared light is less than a set threshold, and to output a normal signal when the reflected infrared light is greater than the set threshold.

[0038] The scheme involves an infrared transmitter actively emitting a beam of modulated infrared light toward the surface of the workpiece, while an infrared receiver simultaneously detects the intensity of the light reflected back from the workpiece surface.

[0039] Based on the differences in infrared light reflectivity of different surfaces, the system determines the characteristics of a metal workpiece. A clean metal workpiece surface, especially under the influence of high-temperature cutting, exhibits high infrared reflectivity, while the pre-defined black marking line, typically made of high-temperature resistant paint, has extremely high infrared absorption and very low reflectivity. A threshold value is set between the intensity of light reflected from the metal surface and the intensity of light reflected from the black marking line. The system can then make precise judgments: if the reflected light intensity is higher than the threshold, it is considered normal; if the reflected light intensity is lower than the threshold, it is considered abnormal, and the abnormality judgment unit outputs a corresponding electrical signal accordingly.

[0040] Compared to visible light sensors, modulated infrared light is much less affected by the intense visible arc light generated during cutting, workpiece discoloration caused by high temperatures, and changes in ambient natural light. This ensures the stability and reliability of path monitoring, allowing the system to operate accurately with a low false alarm rate even in typical plasma cutting environments characterized by sparks and smoke.

[0041] In some preferred embodiments, the cutting trajectory monitoring component 6 is provided with a light-shielding and heat-insulating cover on the outer side near the laser ranging component 3.

[0042] Two major destructive factors are specifically isolated: First, strong light interference. The plasma arc itself is a light source with extremely high temperature and brightness. The stray light it generates can directly hit the photosensitive element of the infrared receiver, causing signal saturation, decreased signal-to-noise ratio, and even device damage. The light shield, through its specific aperture and internal structure, allows only light reflected from the surface of the workpiece below at a specific angle to enter, effectively shielding against direct arc light from the sides and above. Second, high temperature and molten slag attack. The temperature near the cutting point is extremely high, and there is a large amount of hot molten slag and dust splashing. The light shield and heat insulation cover are made of high-temperature resistant materials, such as ceramics or specific alloys, which can prevent most of the splashes from directly impacting or adhering to the precision infrared emitting and receiving lenses, while reducing the impact of heat radiation on the electronic parts of the sensor through physical isolation.

[0043] In some preferred embodiments, the annular connector 1 includes two hinged semi-circular clamping blocks, each of which has a second mounting block 101 at the end away from the hinge; the two second mounting blocks 101 are connected by screws to form a complete clamping structure.

[0044] The semi-circular clamping block has a rubber pad on its inner wall that contacts the outer side of the gun head.

[0045] Two semi-circular clamping blocks are connected by a hinge on one side, forming a mechanism that can be opened and closed. During installation, the device is folded against the outer circumference of the gun head from the side, and then the screws on the two second mounting blocks are tightened to close the two semi-circular blocks tightly, securing them to the gun head. The inner wall is typically equipped with structures to increase friction, such as rubber pads.

[0046] Secondly, a method for using a plasma cutting torch is proposed, which includes: Install the plasma cutting gun auxiliary device onto the head of the plasma cutting gun, then make contact with the workpiece contact guide wheel 4, then align the gun head with the preset black cutting line, and cut along the extension direction of the preset black cutting line. During the cutting process, when the distance between the laser ranging component 3 and the workpiece being cut is greater than the maximum value of the preset range, the vertical telescopic component 2 is shortened by the controller so that the distance is within the preset range. When the distance between the laser rangefinder 3 and the workpiece being cut is less than the minimum value of the preset range, the vertical telescopic component 2 is extended by the controller to bring the distance within the preset range.

[0047] First, the auxiliary device is integrated with the cutting gun through the installation process, and a stable moving support and height reference system are established by using the workpiece contact guide wheel 4. Then, the operator only needs to roughly align the gun head with the black cutting path. After cutting starts, the laser rangefinder 3 continuously monitors the distance, and the controller determines in real time whether the distance is within the preset optimal process window. If it exceeds the window, the vertical telescopic component 2 is immediately controlled to compensate. Throughout the cutting process, the operator's core task is simplified from the complex work of simultaneously focusing on controlling the distance and aligning the path to mainly moving the cutting gun along the general direction.

[0048] This device enables even inexperienced operators to consistently achieve cutting quality approaching that of skilled workers, significantly reducing the technical barrier and training costs. Simultaneously, for skilled workers, this method frees them from continuous mental stress and physical exertion, allowing them to focus more on observing overall cutting quality and handling abnormal situations, thereby improving overall operational efficiency and safety.

[0049] In some preferred embodiments, there are two vertical telescopic components 2; each of the two vertical rods 5 corresponding to the two vertical telescopic components 2 is provided with a cutting trajectory monitoring component 6; during cutting, the two cutting trajectory monitoring components 6 are located on both sides of the width direction of the preset black cutting route.

[0050] The controller is also connected to the cutting trajectory monitoring component 6 and is used to control the plasma cutting gun to stop working when the cutting trajectory monitoring component 6 detects that the cutting trajectory has deviated. The cutting trajectory monitoring component 6 includes an infrared emitter, an infrared receiver, and an anomaly detection unit; the infrared emitter is used to emit infrared light onto the surface of the workpiece being cut; the infrared receiver is used to receive the reflected infrared light; the anomaly detection unit is used to output an abnormal signal when the reflected infrared light is less than a set threshold, and to output a normal signal when the reflected infrared light is greater than the set threshold. When at least one cutting trajectory monitoring component 6 outputs an abnormal signal, the controller determines the risk of cutting trajectory deviation and controls the plasma cutting gun to stop cutting.

[0051] Throughout the cutting process, the system runs two independent monitoring-judgment-execution loops in parallel.

[0052] The first loop consists of a laser rangefinder 3 and a vertical telescopic component 2, which focuses on maintaining a constant physical cutting height.

[0053] The second loop consists of two infrared photosensitive cutting trajectory monitoring components and a gun start / stop mechanism, focusing on maintaining the correct geometric cutting path.

[0054] These two loops work collaboratively under the unified scheduling of the controller. Cutting can only continue when both loops are deemed normal. This ensures the stability of cutting process parameters, directly improving kerf quality and protecting the nozzle. Automatic path deviation detection ensures the accuracy of the cutting contour, reducing scrap and improving efficiency. The combination of these two features significantly increases the probability of a successful cut on the first attempt, while significantly reducing material waste and rework rates. More importantly, the emergency stop function provides an automated safety baseline, preventing large-scale material scrap or equipment damage if the operator fails to detect deviations in time.

[0055] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0056] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0057] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A plasma cutting gun auxiliary device, characterized in that, It includes: Annular connector (1), which is used for coaxial mounting on the outside of the head of the plasma cutting gun; A vertical telescopic assembly (2) is mounted on the annular connector (1) and located downstream of the cutting path; the bottom of the vertical telescopic assembly (2) is coaxial and rotatably connected to a vertical rod (5), and the bottom of the vertical rod (5) is connected to a contact guide wheel (4) of the part to be cut. The laser ranging component (3) is mounted on the annular connector (1) and is located upstream of the cutting path. The vertical telescopic component (2) and the laser ranging component (3) are located on the same diameter of the annular connector (1). The controller is used to control the vertical telescopic assembly (2) to extend or shorten based on the distance between the gun head and the workpiece detected by the laser ranging assembly (3).

2. The plasma cutting gun auxiliary device as described in claim 1, characterized in that: The annular connector (1) is provided with a first mounting block (100) and a second mounting block (101) in the upstream and downstream directions of the cutting path, respectively; the laser ranging component (3) is mounted on the first mounting block (100); the second mounting block (101) is provided with a vertical through hole; The vertical telescopic assembly (2) includes a telescopic element (200) installed on the top surface of the second mounting block (101). A first connecting rod (201) is connected to the telescopic end of the telescopic element (200) and is arranged perpendicular to its telescopic direction. A second connecting rod (202) is connected to the end of the first connecting rod (201) away from the telescopic element (200) and is parallel to the telescopic direction. The second connecting rod (202) is vertically provided with a vertical through hole and is rotatably connected to the vertical rod (5).

3. The plasma cutting torch auxiliary device as described in claim 1, characterized in that: The annular connector (1) is provided with a first mounting block (100) and a second mounting block (101) in the upstream and downstream directions of the cutting path, respectively; the laser ranging component (3) is mounted on the first mounting block (100); the second mounting block (101) is provided with a vertical through hole; The vertical telescopic assembly (2) includes a telescopic element (200), which is installed in the vertical through hole and its telescopic end passes through the vertical through hole and is rotatably connected to the vertical rod (5).

4. The plasma cutting gun auxiliary device as described in claim 1, characterized in that: The number of vertical telescopic components (2) is two; each of the two vertical rods (5) corresponding to the two vertical telescopic components (2) is equipped with a cutting trajectory monitoring component (6); during cutting, the two cutting trajectory monitoring components (6) are located on both sides of the width direction of the preset black cutting route; The controller is also connected to the cutting trajectory monitoring component (6) and is used to control the plasma cutting gun to stop working when the cutting trajectory monitoring component (6) detects that the cutting trajectory has deviated.

5. The plasma cutting torch auxiliary device as described in claim 4, characterized in that: The cutting trajectory monitoring component (6) includes an infrared transmitter, an infrared receiver, and an anomaly detection unit; The infrared emitter is used to emit infrared light onto the surface of the workpiece being cut; the infrared receiver is used to receive the reflected infrared light. The anomaly detection unit is used to output an abnormal signal when the reflected infrared light is less than a set threshold, and to output a normal signal when the reflected infrared light is greater than the set threshold.

6. The plasma cutting torch auxiliary device as described in claim 4, characterized in that: The cutting trajectory monitoring component (6) is provided with a light-shielding and heat-insulating cover on the outside of the laser ranging component (3).

7. The plasma cutting gun auxiliary device as described in claim 2 or 3, characterized in that: The annular connector (1) includes two hinged semi-circular clamping blocks, each of which is provided with a second mounting block (101) at the end away from the hinge; the two second mounting blocks (101) are connected by screws to form a complete clamp structure.

8. The plasma cutting gun auxiliary device as described in claim 7, characterized in that: The semi-circular clamping block has a rubber pad on its inner wall that contacts the outer side of the gun head.

9. A method of using a plasma cutting torch, characterized in that, It includes: Install the plasma cutting gun auxiliary device as described in claim 1 onto the head of the plasma cutting gun, then make contact with the workpiece contact guide wheel (4), then align the gun head with the preset black cutting line, and cut along the extension direction of the preset black cutting line. During the cutting process, when the distance between the laser ranging component (3) and the cut part is greater than the maximum value of the preset range, the vertical telescopic component (2) is shortened by the controller so that the distance is within the preset range. When the distance between the laser ranging component (3) and the cut piece is less than the minimum value of the preset range, the vertical telescopic component (2) is extended by the controller so that the distance is within the preset range.

10. The method of using the plasma cutting gun as described in claim 9, characterized in that: The number of vertical telescopic components (2) is two; each of the two vertical rods (5) corresponding to the two vertical telescopic components (2) is equipped with a cutting trajectory monitoring component (6); during cutting, the two cutting trajectory monitoring components (6) are located on both sides of the width direction of the preset black cutting route; The controller is also connected to the cutting trajectory monitoring component (6) and is used to control the plasma cutting gun to stop working when the cutting trajectory monitoring component (6) detects that the cutting trajectory has deviated. The cutting trajectory monitoring component (6) includes an infrared emitter, an infrared receiver, and an anomaly judgment unit; the infrared emitter is used to emit infrared light to the surface of the workpiece being cut; the infrared receiver is used to receive the reflected infrared light; the anomaly judgment unit is used to output an abnormal signal when the reflected infrared light is less than a set threshold, and to output a normal signal when the reflected infrared light is greater than a set threshold. When at least one cutting trajectory monitoring component (6) outputs an abnormal signal, the controller determines the risk of cutting trajectory deviation and controls the plasma cutting gun to stop cutting.

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