Plasma cutting gun head capable of improving insulation

Abstract

The utility model discloses a plasma cutting gun head capable of improving insulation. The plasma cutting gun head comprises a positive electrode copper piece, a negative electrode copper piece, an insulating piece, a negative electrode copper pipe, a front end insulating piece, a flow guide pipe, an electrode, an electrode nozzle, a diverter, an outer nozzle, a heat shrink tube with glue, a connecting nut and sealing insulation glue. An insulating tube is also included; the insulating part is screwed on the cathode copper part through a thread; the positive electrode copper piece is screwed on the insulating piece through a thread; after the insulating tube at one end is prefabricated on the cathode copper tube, the sealing insulation paste is poured into a gap between the cathode copper piece and the anode copper piece and solidified; after the sealing insulation paste is completely cured, bending the cathode copper pipe; then the heat shrink tube with the adhesive is installed on the bent cathode copper tube, and one end of the heat shrink tube with the adhesive is tightly attached to the cured sealing insulation rubber plane; and the coincidence length between the adhesive heat shrink tube and the insulating tube is not less than 10mm. And the reliability and the stability of the high-frequency plasma cutting gun head are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cutting field more specifically, the utility model relates to a kind of plasma cutting torch head of improving insulation. BACKGROUND

[0002] Plasma cutting is a kind of technology using high-temperature plasma to cut materials, and is widely used in metal processing, mechanical manufacturing and other fields. High-frequency plasma cutting torch head is one of the core components of plasma cutting equipment, and its performance directly affects the quality and efficiency of cutting. The existing high-frequency plasma cutting torch head is usually composed of a positive copper piece, a negative copper piece and an insulating piece, which are connected by a rib position slot. Then, a heat shrink tube is installed on the negative copper pipe, or sealing glue is poured between the negative copper piece and the positive copper piece, and after the sealing glue solidifies, the negative copper pipe is bent, and finally the heat shrink tube on the negative copper pipe is installed.

[0003] This connection method by rib position slot is easy to damage the insulating piece, because the rib position slot needs an interference fit of 0.1-0.2 to fix the negative copper piece, the positive copper piece and the insulating piece. The interference fit causes the insulating piece to be under great stress during assembly, and the local damage will cause the insulation resistance to drop and the torch head to burn out. In addition, whether the heat shrink tube is installed on the negative copper pipe or the heat shrink tube is installed after pouring sealing glue, the short circuit phenomenon caused by dust and moisture cannot be avoided. The probability of short circuit and burnout of the torch head increases with the accumulation of water vapor or dust when the heat shrink tube is installed on the negative copper pipe, and the torch head is easily high-voltage punctured. In the method of pouring sealing glue and then installing heat shrink tube, there are gaps between the contact surfaces of the heat shrink tube and the sealing glue, and the torch head still has the probability of short circuit and burnout. If epoxy is poured after the heat shrink tube is installed, the heat shrink tube will be damaged when the negative copper pipe is bent. This design can prevent short circuit and burnout to some extent, but there are still some problems. As can be seen, due to various reasons, the existing high-frequency plasma cutting torch head may have a short circuit phenomenon during actual use, which may cause burnout. For example, if the quality of the insulating tube is not good or is damaged, it will cause the insulation effect between the positive and negative electrodes to decrease, thereby increasing the possibility of short circuit. In addition, dust, moisture and other factors in the use environment can also cause the insulation effect to decrease. These problems will limit the service life and performance of the high-frequency plasma cutting torch head. Therefore, how to prevent short circuit and burnout and improve the reliability and stability of the high-frequency plasma cutting torch head is an important problem in current technology. SUMMARY

[0004] In view of the problems existing in the prior art, the utility model provides a plasma cutting torch head for improving insulation, which improves the reliability and stability of the high-frequency plasma cutting torch head.

[0005] The technical solution of this utility model is: a plasma cutting gun head with improved insulation, including a positive electrode copper part, a negative electrode copper part, an insulating part, a negative electrode copper tube, a front end insulating part, a guide tube, an electrode, an electrode nozzle, a flow divider, an external nozzle, a heat shrink tubing with adhesive, a connecting nut, and sealing insulating adhesive.

[0006] It also includes insulating tubes;

[0007] The insulating component is screwed onto the negative electrode copper component via threads; the positive electrode copper component is screwed onto the insulating component via threads.

[0008] After prefabricating one end of the insulating tube on the negative electrode copper tube, the sealing insulating adhesive is poured into the gap between the negative electrode copper component and the positive electrode copper component and cured.

[0009] After the sealant has fully cured, bend the negative copper tube; then install the heat shrink tubing with adhesive onto the bent negative copper tube, with one end of the heat shrink tubing tightly against the surface of the cured sealant.

[0010] The overlap length between the adhesive heat shrink tubing and the insulating tubing shall not be less than 10 mm.

[0011] Furthermore, the adhesive-coated heat shrink tubing is an adhesive-coated heat shrink tubing with a wall thickness greater than 0.5 mm.

[0012] Furthermore, the electrode is a split electrode, which includes a split electrode body and a split insert. The interior of the split electrode body is a hollow cavity, and a split insert mounting groove is provided in the hollow cavity near the electrode head. The head end of the split insert is cold-pressed into the split insert mounting groove, and the tail end of the split insert extends into the hollow cavity, so that an annular narrow groove is formed between the tail end of the split insert and the hollow cavity.

[0013] The beneficial effects of this utility model are:

[0014] 1. Connect the positive copper component, negative copper component, and insulating component with threads to avoid insulation damage caused by the grooved connection method during installation.

[0015] 2. First, pre-fabricate one end of the insulating tube on the negative electrode copper tube, then pour epoxy sealant between the positive and negative electrodes. After the epoxy sealant has completely cured, bend the negative electrode copper tube, and then fit it with a heat-shrink tubing with a wall thickness greater than 0.5mm. The overlap between the heat-shrink tubing and the previously pre-fabricated insulating tube should be at least 10mm. The insulation resistance of this double-layer insulation can reach over 5000 megohms, effectively preventing voltage breakdown.

[0016] 3. The adhesive heat shrink tubing is an adhesive heat shrink tubing with a wall thickness greater than 0.5mm. After installation with the insulating tubing, it can prevent water vapor and dust from entering the gap between the two and causing breakdown.

[0017] 4、The insulating tube is inserted into one end of the insulating part, and the insulating tube and the insulating part have a distance of overlap, so that when the sealing insulating glue loses effect, higher insulation resistance can still be provided to prevent the gun head from being broken down. The insulation can provide good insulation under the condition of 200 DEG C.

[0018] 5、The double-layer insulating tube design can effectively improve the insulation effect between the positive and negative electrodes, reduce the possibility of short circuit, avoid the influence of dust and moisture on the insulation of the gun head, and greatly improve the service life of the gun head. Because the negative copper tube is bent first and then the insulating tube with glue is installed, the damage to the insulating material on the negative copper tube during the bending process is also avoided.

[0019] 6、The gun head in the utility model further comprises a split electrode. The split electrode comprises a split electrode main body and a split insert, and the split insert is cold-pressed in the split electrode main body. The use of the insert makes electrode processing simpler, avoids the machining of a traditional electrode in a ring-shaped narrow groove, so that a larger diameter inner circle cutter can be used for machining, the machining efficiency and the yield are improved, and the manufacturing cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A cross-sectional view of a plasma cutting gun head with improved insulation.

[0021] Figure 2 A cross-sectional view of a split electrode.

[0022] Figure 3 A cross-sectional view of a traditional electrode.

[0023] Symbol Name Symbol Name 1 Joint nut 2 Negative copper tube 3 Taped heat shrink tube 4 Insulation tube 5 Positive copper piece 6 Sealing insulation glue 7 Insulation piece 8 Outer nozzle 9 Flow guide tube 10 Front end insulation piece 11 Negative copper piece 12 Shunt 13 Split electrode 14 Electrode nozzle 15 Split electrode body 16 Split electrode insert DETAILED DESCRIPTION

[0024] The utility model will be further described below with reference to the drawings.

[0025] The plasma cutting gun head with improved insulation mainly comprises a positive copper part 5, a negative copper part 11, an insulating part 7, a negative copper tube 2, a front-end insulating part 10, a flow guide pipe 9, a split electrode 13, an electrode nozzle 14, a shunt 12, an outer nozzle 8, a hot shrinkable tube with glue 3, an insulating tube 4, a connecting nut 1 and sealing insulating glue 6.

[0026] As shown in Figure 1 A plasma cutting gun head with improved insulation, according to the structure of the drawing, the plasma cutting gun head with improved insulation is further installed as follows.

[0027] The negative copper pipe 2 is welded to the negative copper piece 11. The insulating piece 7 is screwed to the welded negative copper piece 11. The positive copper piece is screwed to the insulating piece 7. The insulating pipe 4 is sleeved on the negative copper pipe 11. The sealing insulating glue 6 is filled into the gap between the negative copper piece and the positive copper piece, and is waited for curing. The assembly with the cured sealing insulating glue 6 is put into a pipe bender to bend the negative copper pipe 11. The glue hot shrinkable pipe 3 is installed on the bent negative copper pipe, and one end of the glue hot shrinkable pipe 3 must be close to the plane of the cured sealing insulating glue 6. The glue hot shrinkable pipe 3 is shrunk by a hot air gun. The flow guide pipe 9 is screwed to the negative copper piece 11. The connecting nut 1 is screwed to the threaded end of the negative copper pipe. The split electrode 13 is screwed to the negative copper piece 11. The shunt 12 is sleeved on the split electrode 13. The electrode nozzle 14 is sleeved on the shunt 12. The outer nozzle 8 is screwed to the positive copper piece 5, and the electrode nozzle 14 and the shunt 12 are fixed to the gun head by screwing the outer nozzle 8.

[0028] As shown in Figure 2 , the split electrode 13 is first machined into a split electrode body 15, then a split electrode insert 16 is machined, and then the split electrode insert 16 is crimped into the split electrode body 15, and the two radial joint surfaces are in interference fit. The use of the insert makes electrode machining simpler, avoiding the machining of the annular narrow slot in the traditional electrode as shown in Figure 3 . Thus, a larger diameter internal circular cutter can be used for machining, improving machining efficiency and yield and reducing manufacturing cost.

[0029] The gun head is connected by screwing between the positive copper piece 5, the negative copper piece 11 and the insulating piece 7, improving the product quality and avoiding the risk of reducing the insulation resistance during the manufacturing process. Through the cooperation of the prefabricated insulating pipe 4 on the negative copper piece and the glue hot shrinkable pipe 3, the insulation resistance of the entire gun head reaches more than 5000 megaohms, improving the insulation of the product and increasing the risk of short-circuit burnout of the gun head.

[0030] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. An improved insulated plasma cutting torch head, comprising a positive copper piece (5), a negative copper piece (11), an insulating piece (7), a negative copper tube (2), a front-end insulating piece (10), a flow guide tube (9), an electrode (13), an electrode nozzle (14), a shunt (12), an outer nozzle (8), a hot shrink tube with glue (3), a connecting nut (1) and sealing insulating glue (6). characterized in that Further comprising an insulating tube (4). The insulating piece (7) is screwed onto the negative copper piece (11); the positive copper piece (5) is screwed onto the insulating piece (7). An end of the insulating tube (4) is prefabricated on the negative copper piece (11), then the sealing insulating glue (6) is poured into the gap between the negative copper piece (11) and the positive copper piece (5) and solidified. After the sealing insulating glue (6) is completely solidified, the negative copper piece (11) is bent, then the hot shrink tube with glue (3) is installed on the bent negative copper tube, one end of the hot shrink tube with glue (3) abuts against the plane of the solidified sealing insulating glue (6). The overlapping length between the hot shrink tube with glue (3) and the insulating tube (4) is not less than 10 mm.

2. An insulated plasma cutting torch according to claim 1, wherein: The hot shrink tube with glue (3) is a hot shrink tube with glue having a wall thickness greater than 0.5 mm.

3. The improved insulated plasma torch tip of claim 1, wherein: The electrode (13) is a split electrode, the split electrode comprising a split electrode main body and a split insert, the split electrode main body being a hollow cavity, a split insert mounting groove being arranged near the electrode head end in the hollow cavity, the split insert head end being cold-pressed in the split insert mounting groove, the split insert tail end extending into the hollow cavity, so that an annular narrow groove is formed between the split insert tail end and the hollow cavity.

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