A plasma cutting device for opening holes and a method of using the same

Abstract

The application provides a plasma cutting device for hole opening and a use method thereof, and the plasma cutting device comprises a center positioning assembly, a rotating arm, a hole opening radius and a plasma cutting gun fixing seat. The center positioning assembly fixes the center of a circle by using a conical positioning rod; the rotating arm is connected with the positioning rod vertically and serves as a rotating guide part; a hole opening radius adjusting device realizes stepless adjustment of the radius by an adjusting seat, a sliding block, a connecting rod and a fastener, and is suitable for different hole diameters; and the plasma cutting gun fixing seat adopts a double clamp structure and is used for firmly clamping the cutting gun. The application converts manual cutting into mechanical guide cutting, effectively solves the problems of low precision, poor roundness, low efficiency and large trimming amount in traditional manual cutting, has the advantages of accurate positioning, convenient adjustment, high hole opening consistency and high operation efficiency, has low operation threshold, and is suitable for thin plate hole opening operation in the fields of ship outfitting and the like.

Description

Technical Field

[0001] This invention belongs to the field of plasma cutting technology, specifically relating to a plasma cutting device for hole drilling and its usage method. Background Technology

[0002] During ship outfitting operations, it is often necessary to drill holes of various diameters in thin steel plates for pipe passage, bolt connections, or the installation of other accessories. Currently, handheld plasma cutters are commonly used for manual hole drilling on-site. During the operation, operators typically first visually determine the approximate center, then draw the circular outline to be cut around that center. Finally, relying on visual judgment and experience, they move the handheld cutting torch along the drawn outline to complete the cut. However, this traditional manual method has several problems, as follows: First, the consistency of the opening size is poor and the accuracy is difficult to guarantee. Since the scribing itself relies on visual inspection and experience, coupled with the deviation of hand operation during the cutting process, the size of the round holes made on the same batch or the same component is significantly different, which cannot meet the consistency requirements. Secondly, the quality of the cut surface is greatly affected by the stability of the operator's hand. When manually moving the cutting gun, it is difficult to maintain a uniform speed and a stable trajectory. The cut arc is often not smooth enough and is prone to jagged or irregular edges, which affects the fit of subsequent accessories. Third, even if the operator marks a relatively standard circular outline on the steel plate in advance, the instability of holding the cutting gun during the actual cutting process will still cause the cutting trajectory to deviate from the marking line, making it difficult to maintain the high precision of the roundness of the final hole, resulting in problems such as elliptic or local deformation. Fourth, due to the aforementioned problems, the edges of the cut holes are often uneven, and the cutting amount is frequently too much or too little. To ensure the quality of subsequent installation, additional manpower is often required to grind, weld, or trim the edges of the holes, increasing the overall workload and affecting construction efficiency. Fifth, this method of operation requires a high level of skill from the operator. Experienced workers can cut relatively regular round holes, while novices often find it difficult to control the cutting quality. At the same time, manually drilling holes one by one is inefficient, especially in outfitting operations that require a large number of holes, which is time-consuming and restricts the overall construction progress. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides the following technical solution: A plasma cutting device for creating openings includes: a center positioning assembly comprising a positioning rod and a connecting seat, the bottom end of the positioning rod being tapered for positioning the center of the opening; the connecting seat being connected to the top end of the positioning rod; a rotating arm connected to the positioning rod via the connecting seat for an operator to hold and rotate the positioning rod; a plasma cutting gun mounting base for clamping and fixing the plasma cutting gun; and an opening radius adjustment device comprising an adjustment seat, a slider, a connecting rod, and fasteners, the adjustment seat being mounted on the side wall of the connecting seat, the adjustment seat having a slide rail extending away from the positioning rod, the end of the slider passing through the slide rail and slidably mounted within the slide rail; one end of the connecting rod being connected to the plasma cutting gun mounting base, and the other end being connected to the slider, the slider sliding within the slide rail causing the connecting rod to slide in the same direction; and the fasteners being used to lock the slider in a set position within the slide rail.

[0004] In some embodiments, the connecting seat is vertically connected to the axial center of the rotating arm.

[0005] In some embodiments, the plasma cutting gun mounting base includes a locking member and two opposing clamps, the two clamps forming a receiving space adapted to the outer wall of the plasma cutting gun, and the locking member is used to lock the mating ends of the two clamps.

[0006] In some embodiments, when the adjusting seat is a single piece of steel plate, the connecting rod has a through hole at one end near the adjusting seat; the slider is a wing bolt, the fastener is a nut, the wing bolt passes through the through hole and the slide rail, and the nut cooperates with the wing bolt to lock it in place. In some embodiments, when the adjusting seat is two parallel and symmetrically arranged steel plates, a gap is formed between the two steel plates; the end of the connecting rod extends into the gap, and a through hole is provided at one end extending into the gap; the slider is a bolt, and the fastener is two nuts. The bolt passes through the slide rail of one side of the steel plate, the through hole, and the slide rail of the other side of the steel plate in sequence, and is locked by the two nuts.

[0007] In some embodiments, the end of the connecting rod near the plasma cutting gun holder is bent.

[0008] In some embodiments, the rotating arm has a scale, the scale interval of which corresponds to the effective sliding length of the slide.

[0009] In some embodiments, the angle between the conical surface of the conical bottom end of the positioning rod and the horizontal plane is 60°.

[0010] The present invention also provides a method for using a plasma cutting device for drilling holes, comprising the following steps: marking the center position of the hole on a metal plate; pressing the conical bottom end of the positioning rod into the center position; pushing the slider along the slide rail according to the radius of the hole until the distance between the plasma cutting gun and the positioning rod is equal to the radius of the hole; locking the slider with fasteners; installing the plasma cutting gun into the plasma cutting gun mounting base; starting the plasma cutting machine; the operator holding the rotating arm and rotating the rotating arm clockwise or counterclockwise around the positioning rod as the central axis.

[0011] Compared with the prior art, the plasma cutting apparatus for hole drilling and its method of use provided by the present invention have the following beneficial effects: 1. The plasma cutting device for hole making provided by the present invention, through the cooperation of the rotating arm and the central positioning mechanism, constrains the movement trajectory of the plasma cutting gun on a circle with the positioning as the center, eliminating the deviation caused by manual operation; at the same time, the adjustable radius locking mechanism adopts the mechanical fixing method of slide block, slide rail and fastener, which can completely lock the cutting radius after adjustment, ensuring that the distance between the plasma cutting gun and the positioning rod is constant during the cutting process, thereby ensuring the dimensional accuracy of each circular hole and the consistency during batch cutting; 2. The adjustable radius locking mechanism achieves stepless adjustment of the radius by sliding the slider in the slide rail, which can cover any hole diameter from the minimum radius to the maximum radius, meeting the opening requirements of different specifications; 3. Compared to traditional methods of cutting and opening holes by marking, visual inspection, and freehand cutting, this plasma cutting device eliminates the need for repeated measurement, marking correction, and post-cutting finishing, significantly reducing the processing time per hole. Moreover, in outfitting operations requiring a large number of holes, it can quickly complete batch drilling tasks, effectively shortening the construction cycle and improving overall work efficiency. 4. This plasma cutting device is simple to use and has a low operating threshold. Operators do not need extensive manual cutting experience to quickly master it. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the plasma cutting device provided by the present invention; Figure 2 A schematic diagram of the plasma cutting apparatus provided by the present invention in another embodiment; Figure 3 This is a schematic diagram of the plasma cutting apparatus provided by the present invention in yet another embodiment; Figure 4 This is a schematic diagram of the opening radius adjustment device provided by the present invention; Figure 5This is a side view of the aperture radius adjustment device provided by the present invention; Figure 6 A side view of the aperture radius adjustment device provided by the present invention in another embodiment.

[0013] Explanation of icon numbers: 1—Center positioning component; 11—Positioning rod; 12—Connecting seat; 2—Rotating arm; 3—Plasma cutting gun holder; 31—Clamp; 4—Opening radius adjustment device; 41—Adjusting seat; 411—Slide rail; 412—Steel plate; 42—Slider; 421—Bolt; 422—Wing bolt; 43—Connecting rod; 44—Fastener; 441—Nut. Detailed Implementation

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0015] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0016] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0017] In this document, 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 fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] This invention provides a plasma cutting apparatus for creating openings, see reference. Figures 1 to 3As shown, the plasma cutting device includes: a center positioning assembly 1, a rotating arm 2, a plasma cutting gun mounting base 3, and an opening radius adjustment device 4. Specifically: The aforementioned center positioning component 1 includes a positioning rod 11 and a connecting seat 12. The bottom end of the positioning rod 11 is tapered to position the center of the opening, thus fixing the center position when drawing a circle and ensuring that the center remains stationary. For example, the angle between the inclined surface of the tapered bottom and the horizontal plane is 60°. This angle balances the sharpness of the tip with structural strength, facilitating insertion into the steel plate 412 while preventing tip bending and damage. Furthermore, this angle can be adaptively adjusted to other degrees for different hardness plates and different positioning requirements, specifically determined based on the sharpness of the tapered tip and the material of the plate.

[0019] The connection between the connecting seat 12 and the top of the positioning rod 11 can be achieved by using threaded connection, welding, or integral molding processes to ensure a firm and secure connection.

[0020] The rotating arm 2 is the operating gripping component for hole cutting operations. It is perpendicularly connected to the positioning rod 11 via the connecting seat 12, with the two at a 90° angle to ensure that the trajectory during rotational cutting is a standard circle. Preferably, the connecting seat 12 is connected to the center of the rotating arm 2 along its axis, so that the force on both ends of the rotating arm 2 is balanced, making it more stable for the operator to hold and rotate, and avoiding cutting deviation caused by unilateral force. The surface of the rotating arm 2 is treated for rust removal and anti-slip.

[0021] The plasma cutting gun holder 3 is used to clamp and fix the plasma cutting gun, ensuring that the gun body does not shake and the nozzle position does not shift during the cutting process. It consists of a locking component and two opposing clamps 31. The two clamps 31 form a receiving space that fits the outer wall of the plasma cutting gun. The inner wall of the clamps 31 can be equipped with anti-slip rubber pads to avoid scratching the gun body and improve clamping friction. The mating ends of the two clamps 31 are locked by bolts, screws and other locking components. The receiving space is reduced by tightening the connecting component, thus securing the plasma cutting gun. When disassembling, the plasma cutting gun can be quickly removed by loosening the connecting component. It is easy to disassemble and assemble and is compatible with various specifications of plasma cutting guns.

[0022] The opening radius adjustment device 4 includes an adjustment seat 41, a slider 42, a connecting rod 43, and a fastener 44. The adjustment seat 41 is fixedly installed on the side wall of the connecting seat 12. A slide 411 is provided on the adjustment seat 41. The slide 411 extends in a direction away from the positioning rod 11. The end of the slider 42 passes through the slide 411 and is slidably installed in the slide 411.

[0023] One end of the connecting rod 43 is connected to the plasma cutting gun mounting base 3, and the other end is connected to the slider 42, forming a linkage structure. When the slider 42 slides in the slide rail 411, it can drive the connecting rod 43 to slide in the same direction.

[0024] The sliding direction of slider 42 within slide rail 411 determines the aperture size. Specifically, when slider 42 slides away from positioning rod 11, connecting rod 43 moves away from positioning rod 11, thereby driving plasma cutting gun mounting base 3 away from positioning rod 11, increasing the distance between plasma cutting gun and central positioning rod 11, and achieving a larger aperture opening. Conversely, when slider 42 slides towards positioning rod 11, connecting rod 43 and plasma cutting gun mounting base 3 move towards positioning rod 11 simultaneously, reducing the distance between cutting gun and positioning rod 11, and achieving a smaller aperture opening.

[0025] The fastener 44 mentioned above locks the slider 42 in the set position of the slide rail 411. That is, after the distance between the plasma cutting gun holder 3 and the positioning rod 11 is adjusted, the slider 42 is locked and fixed in the slide rail 411 by the fastener 44 to prevent the slider 42 from shifting during the cutting process and causing hole diameter deviation.

[0026] For example, the position of slider 42 in slide rail 411 generally includes the following three states: First, the minimum radius position: the slider 42 is located at the end of the slide 411 closest to the positioning rod 11. At this time, the distance between the plasma cutting gun and the positioning rod 11 is the smallest, which corresponds to cutting the smallest diameter circular hole. Second, the maximum radius position: the slider 42 is located at the end of the slide rail 411 that is furthest from the positioning rod 11. At this time, the distance between the plasma cutting gun and the positioning rod 11 is the largest, which corresponds to cutting the largest diameter circular hole. Third, the intermediate position: the slider 42 can be located at any point between the minimum radius position and the maximum radius position, adapting to the opening requirements of intermediate specification holes. During the cutting operation, according to the radius size of the target opening, the slider 42 is precisely moved to the corresponding position, and then locked by the fastener 44.

[0027] In some implementations, combined Figures 4 to 6 As shown, the adjusting seat 41 adopts a steel plate 412 structure design, which is divided into a single steel plate 412 and two steel plates 412, as detailed below: When the adjusting seat 41 is made of a single piece of steel plate 412, one end of the steel plate 412 is welded to the side wall of the connecting seat 12. The overall shape of the steel plate 412 is not limited and can be designed as a quadrilateral, triangle, trapezoid, or other regular geometric shape according to the installation space and structural strength requirements. The slide rail 411 is formed on the single piece of steel plate 412. The shape of the slide rail 411 can be designed as an arc, strip (straight line), etc., and the extension direction of the slide rail 411 is away from the positioning rod 11. The connecting rod 43 has a through hole at the end near the adjusting seat 41.

[0028] In this embodiment, refer to the appendix. Figure 5As shown, the slider 42 and fastener 44 can adopt the following structure: the slider 42 is a bolt 421, and the fastener 44 is a nut 441 that mates with the bolt 421, such as a wing bolt 422 and its matching nut 441. The wing-shaped structure of the head of the wing bolt 422 can increase the lateral force-bearing surface and improve the efficiency of manual installation. The wing bolt 422 passes through the through hole on the connecting rod 43 and through the slide rail 411. After the wing bolt 422 slides in the slide rail 411 until the distance between it and the positioning rod 11 meets the required opening radius, the nut 441 is inserted into the end of the bolt 421 and tightened to fix the bolt 421 in that position.

[0029] When the adjusting seat 41 uses two steel plates 412, the ends of the two steel plates 412 are welded to the side wall of the connecting seat 12. The overall shape of the steel plates 412 is not limited and can be designed as a quadrilateral, triangle, trapezoid, or other regular geometric shape according to the installation space and structural strength requirements. The two steel plates 412 are arranged in parallel and symmetrically, and corresponding positions are provided with slides 411 of identical shape and size. The sliding trajectories on the two steel plates 412 are in the same direction. A gap is reserved between the two steel plates 412, which allows the end of the connecting rod 43 to extend into. At the same time, the end of the connecting rod 43 that extends into the gap is provided with a through hole.

[0030] In this implementation method, refer to the appendix. Figure 6 As shown, the slider 42 and the fastener 44 can adopt the following structure: the slider 42 is a bolt 421, and the fastener 44 is two nuts 441 that mate with the bolt 421. The distance between the connecting rod 43 and the positioning rod 11 is manually adjusted. After the position is determined, the bolt 421 is passed through the slide rail 411 of one side of the steel plate 412, the through hole at the end of the connecting rod 43, and the slide rail 411 of the other side of the steel plate 412 in sequence. Then, the two nuts 441 are respectively fitted onto both ends of the bolt 421 and tightened, thereby fixing the connecting rod 43.

[0031] In some embodiments, the end of the connecting rod 43 near the plasma cutting gun mounting base 3 is bent. This bending structure is used to adjust the installation angle of the plasma cutting gun so that it can maintain the optimal angle or operating posture with the surface of the steel plate 412 under specific working conditions. The specific bending angle can be determined according to the model of the plasma cutting gun used to adapt to the installation angle requirements of different models.

[0032] In some implementations, to further improve the accuracy of aperture adjustment, a scale is provided on the surface of the rotating arm 2 along the length direction. The scale range of the scale corresponds to the effective sliding length of the slide rail 411. The operator can intuitively read the distance between the slider 42 and the positioning rod 11, and the distance between the plasma cutting gun and the positioning rod 11 through the scale. No additional measuring tools are required, which can achieve fast and accurate hole adjustment, greatly reduce the difficulty of operation and improve the hole opening accuracy.

[0033] This invention provides a method for using the above-mentioned plasma cutting apparatus, the steps of which are as follows: Step 1, Locate the center of the hole: Mark the center position on the metal steel plate 412 where the hole needs to be made, align the conical bottom of the positioning rod 11 with the center mark, and press the conical tip into the surface of the steel plate 412 with force according to the hardness of the plate, or gently tap the top of the positioning rod 11 with a rubber hammer to make the conical tip firmly embedded in the steel plate 412 and securely position it.

[0034] Step 2, Adjust the aperture: According to the radius R of the target circular hole, refer to the scale on the rotating arm 2 and push the slider 42 to slide along the slide rail 411 until the distance between the plasma cutting gun and the positioning rod 11 is equal to the radius R; after confirming that the position is correct, tighten the matching nut 441 to lock the slider 42 and the connecting rod 43 on the adjusting seat 41 to prevent the slider 42 from shifting during the cutting process and ensure that the aperture is constant.

[0035] Step 3: Install the plasma cutting gun: Insert the plasma cutting gun between the two clamps 31 of the plasma cutting gun mounting base 3, adjust the distance between the nozzle and the surface of the metal plate 412, and then tighten the bolts 421 at the joint of the clamps 31 to clamp and fix the plasma cutting gun.

[0036] Step 4, Cutting the Hole: Start the plasma cutting machine. After the arc stabilizes, the operator holds the rotating arm 2 and, with the positioning rod 11 as the central axis, maintains a uniform speed and stable force, slowly rotating the rotating arm 2 clockwise or counterclockwise for one revolution to ensure that the cutting nozzle moves smoothly along the circular trajectory and completes the entire cutting operation.

[0037] Step 5, Cutting Finishing: After cutting, first loosen the switch of the plasma cutting gun. After the nozzle cools down, loosen the clamp 31 and the connector to remove the plasma cutting gun. Finally, remove the entire plasma cutting device from the metal steel plate 412 to obtain a circular opening with a precise center, regular edges, and qualified hole diameter.

[0038] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A plasma cutting apparatus for creating openings, characterized in that, include: A center positioning assembly includes a positioning rod and a connecting seat. The bottom end of the positioning rod is tapered and used to position the center of the opening. The connecting seat is connected to the top end of the positioning rod. A rotating arm, connected to the positioning rod via the connecting seat, is used by the operator to hold and rotate the positioning rod. A plasma cutting gun mounting base is used to clamp and fix the plasma cutting gun. An opening radius adjustment device includes an adjusting seat, a slider, a connecting rod, and a fastener. The adjusting seat is mounted on the side wall of the connecting seat and has a slide rail extending away from the positioning rod. The end of the slider passes through the slide rail and is slidably installed within it. One end of the connecting rod is connected to the plasma cutting gun mounting base, and the other end is connected to the slider. When the slider slides within the slide rail, it drives the connecting rod to slide in the same direction. The fastener is used to lock the slider in a set position within the slide rail.

2. The plasma cutting apparatus for drilling according to claim 1, characterized in that... The connecting seat is vertically connected to the axial center of the rotating arm.

3. The plasma cutting apparatus for drilling according to claim 1, characterized in that, The plasma cutting gun mounting base includes a locking member and two opposing clamps. The two clamps enclose a receiving space that is adapted to the outer wall of the plasma cutting gun. The locking member is used to lock the mating ends of the two clamps.

4. The plasma cutting apparatus for drilling according to claim 1, characterized in that, When the adjusting seat is a single piece of steel plate, the connecting rod has a through hole at one end near the adjusting seat; the slider is a wing bolt, the fastener is a nut, the wing bolt passes through the through hole and the slide rail, and the nut cooperates with the wing bolt to lock it in place.

5. The plasma cutting apparatus for drilling according to claim 1, characterized in that, When the adjusting seat is two parallel and symmetrically arranged steel plates, a gap is formed between the two steel plates; the end of the connecting rod extends into the gap, and a through hole is provided at one end extending into the gap; the slider is a bolt, and the fastener is two nuts. The bolt passes through the slide rail of one side of the steel plate, the through hole and the slide rail of the other side of the steel plate in sequence, and is locked by the two nuts.

6. The plasma cutting apparatus for drilling according to claim 1, characterized in that, The end of the connecting rod near the plasma cutting gun mounting base is curved.

7. The plasma cutting apparatus for drilling according to claim 1, characterized in that, The rotating arm has a scale, and the scale interval of the scale corresponds to the effective sliding length of the slide.

8. The plasma cutting apparatus for drilling according to claim 1, characterized in that, The angle between the conical bottom end of the positioning rod and the horizontal plane is 60°.

9. A method of using a plasma cutting apparatus for drilling, characterized in that, The steps are as follows: Mark the center position of the opening on the metal plate; press the conical bottom end of the positioning rod into the center position; according to the radius of the opening, push the slider to slide along the slide rail until the distance between the plasma cutting gun and the positioning rod is equal to the radius of the opening; lock the slider with fasteners; install the plasma cutting gun into the plasma cutting gun mounting base. Start the plasma cutting machine, and the operator holds the rotating arm and rotates it one revolution clockwise or counterclockwise around the positioning rod as the central axis.

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