Novel plasma cutter

Abstract

The utility model relates to the technical field of plasma cutters, in particular to a novel plasma cutter which comprises a case, a cutting gun, a bond strap, a grounding wire, a refrigerating system, an air inlet pump and a guide device. The case is connected with a bond strap, a grounding wire and a cutting gun, the cutting gun is connected with a refrigerating system and an air inlet pump, a connecting part is arranged on one side of the cutting gun, the cutting gun is detachably connected with a guide device through the connecting part, and the guide device is detachably and fixedly connected with a workpiece; a guide plate is arranged in the guide device, the guide plate is detachably and fixedly connected with a workpiece, a sliding groove is formed in the guide plate, the guide plate is slidably connected with a connecting block through the sliding groove, a connecting hole is formed in one side of the connecting block, and the connecting hole is detachably connected with a cutting gun through a locking device. The device is simple and convenient to use and install, can be suitable for workpieces with different thicknesses, is more convenient to use, can guide cutting, can cut out cutting surfaces with better shapes, and brings convenience to subsequent machining of the workpieces.

Description

Technical Field

[0001] The utility model relates to the technical field of plasma cutters, in particular to a novel plasma cutter. Background Art

[0002] A plasma cutter is a device that relies on a high-temperature electric arc to cut metal workpieces. During the process, an ionization chamber is set in the nozzle of the cutting gun. A negative electrode metal is set inside the ionization chamber, and the negative electrode metal is connected to the negative electrode of the power supply. The side wall of the ionization chamber is connected to the positive electrode of the power supply, so that the compressed gas entering the ionization chamber can be ionized. The compressed gas is locally ionized to form a high-temperature plasma arc. The workpiece is connected to the power supply through a grounding wire. At this time, the nozzle is brought close to the workpiece, so that a high-temperature plasma arc can be ejected from the nozzle. The heat is enough to melt the metal at the cut of the workpiece, and the molten metal is blown away by a high-speed airflow, thereby achieving the purpose of cutting.

[0003] Existing plasma cutters are divided into two types: contact and non-contact. The contact type is that the nozzle is in contact with the workpiece. At this time, due to the recoil of the molten metal, the nozzle is easily burned, and the nozzle loss is large; the non-contact type is equipped with an arc pilot wire. During the process, the nozzle is 5~8mm away from the workpiece surface, thereby avoiding the recoil of the molten metal and effectively ensuring the service life of the nozzle; therefore, non-contact plasma cutters are currently widely used.

[0004] However, in the non-contact cutting method, the cutting gun needs to be held in the air by the operator during the process. Due to the shaking of the operator's hands, it is difficult to ensure the height of the cutting distance and stable cutting. At the same time, it is difficult to cut a smooth cutting surface at the cutting position, which not only causes material waste, but also is not convenient for subsequent processing of the workpiece, bringing inconvenience to the actual operation. Therefore, a plasma cutter that can fix and guide the cutting gun so that stable cutting can be performed and a smooth cutting surface can be cut is a problem that needs to be solved urgently. Utility Model Content

[0005] The utility model aims to provide a novel plasma cutter to solve the above-mentioned deficiencies of the prior art, so as to achieve the purpose of fixing and guiding the cutting gun, thereby enabling stable cutting and cutting a smooth cutting surface.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a new plasma cutter, including a chassis and a cutting gun, the chassis is connected to a grounding wire, a grounding wire and a cutting gun, the cutting gun is connected to a refrigeration system and an air intake pump, a connecting part is provided on one side of the cutting gun, and the connecting part is detachably connected to a guide device, and the guide device is detachably fixedly connected to a workpiece.

[0007] Furthermore, the guide device comprises a guide plate, both ends of which are detachably fixedly connected to the workpiece, and a connecting device is slidably mounted on the guide plate, and the connecting device is detachably fixedly connected to the cutting gun.

[0008] Furthermore, the two ends of the guide plate are sleeved with fixing parts, and the two ends of the guide plate are detachably fixed to the workpiece through the fixing parts; a lower clamping plate is arranged in the fixing part, and the lower clamping plate is connected to the upper clamping plate through a connecting rod, and the length of the lower clamping plate is longer than the length of the upper clamping plate; a "mouth"-shaped fixing hole is formed between the lower clamping plate and the upper clamping plate through the connecting rod, and the two ends of the guide plate are inserted into the fixing hole, the lower clamping plate cooperates with the lower bottom surface of the workpiece, and a bolt hole is opened on the upper clamping plate, and a fastening bolt is connected through the bolt hole, and the fastening bolt cooperates with the guide plate.

[0009] Furthermore, a slide groove is provided in the guide plate, and the connecting device is slidably installed in the slide groove; a connecting block is provided in the connecting device, which is connected to the slider below the connecting block, and the slider cooperates with the slide groove. A connecting hole is provided on one side of the connecting block, and it is detachably connected to the connecting part on one side of the cutting gun through the connecting hole.

[0010] Furthermore, the horizontal distance between the upper clamping plate and the workpiece is greater than the length of the side where the connecting block is connected to the cutting gun.

[0011] Furthermore, a roller is installed at the bottom of the sliding block, and the roller matches with the lower bottom surface of the sliding groove.

[0012] Furthermore, the connecting block is provided with an installation cavity, the installation cavity is communicated with the connecting hole, a locking device is installed in the installation cavity, a locking part which reciprocates up and down is provided in the locking device, a matching groove is provided on the connecting part, and the locking part matches with the matching groove.

[0013] Furthermore, a connecting plate is provided in the locking device, the locking part is provided below the connecting plate, an annular plate with a hole is provided above the connecting plate, the hand-held part passes through the annular plate and is connected to the top of the connecting plate, a spring is fixedly installed between the annular plate and the connecting plate, and the annular plate is fixedly installed above the installation cavity.

[0014] Beneficial effects of the utility model:

[0015] 1. Easy to install and use. It can be adapted to workpieces of different thicknesses during use, making it more convenient to use;

[0016] 2. The guide plate can guide the cutting, avoiding the occurrence of bad shapes such as cutting seam bending caused by unstable hands, which brings convenience to use and facilitates the subsequent processing of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic diagram of the principle of an existing plasma cutter;

[0018] Figure 2 This is a schematic diagram of the matching structure of the cutting gun and the guide device of the utility model;

[0019] Figure 3 It is a schematic diagram of the structure of the guide plate in the guide device of the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the fixing parts at both ends of the guide plate of the utility model;

[0021] Figure 5 This is a schematic diagram of the matching structure of the fixing member and the guide plate of the utility model ( Figure 2 right view);

[0022] Figure 6 This is a schematic diagram of the installation and matching of the connecting block and the cutting gun in the guide device of the utility model (locked state);

[0023] Figure 7 It is a schematic diagram of the installation and matching of the connecting block and the cutting gun in the guide device of the utility model (loose state).

[0024] The names corresponding to the marks in the figure are:

[0025] 1. Power supply; 2. Resistor; 3. Nozzle; 31. Ionization chamber; 32. Cooling chamber; 33. Cathode; 34. Arc outlet; 35. Air inlet pipe; 36. Refrigerant inlet; 37. Refrigerant outlet; 4. Workpiece; 5. Guide plate; 51. Slide groove; 52. End cap; 6. Fixing piece; 61. Lower clamping plate; 62. Connecting rod; 63. Upper clamping plate; 64. Fixing hole; 65. Bolt hole; 66. Fastening bolt; 7. Connecting device; 71. Connecting block; 72. Sliding block; 73. Roller; 74. Connecting hole; 75. Mounting cavity; 76. Locking device; 761. Connecting plate; 762. Locking part; 763. Hand-held part; 764. Spring; 765. Ring plate; 8. Cutting gun; 81. Connecting part; 811. Matching groove. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0027] Embodiments of the present utility model:

[0028] like Figure 1As shown in the figure, the existing plasma cutter includes a machine case and a cutting torch 8. Regarding its principle, the negative pole of the power supply 1 is connected to the negative pole 33 in the nozzle 3, and the positive pole of the power supply 1 is connected to the outside of the nozzle 3 through a resistor 2. At this time, a circuit is formed. By introducing gas into the ionization chamber 31 in the nozzle 3, the gas is introduced through the intake pipe 35 during the process. Generally, the gas is air pumped by an air pump. The air pump can be separated from the machine case or integrated with the machine case; the introduced air is ionized between the positive and negative poles in the ionization chamber 31. At this time, the generated plasma arc is locked in the ionization chamber 31. During this process, due to the high temperature of the plasma arc, a cooling medium needs to be introduced. The existing cooling media include water and compressed air, etc., each having its application scenarios. For cutting thin plates with small current, generally compressed air cooling can be used. Using compressed air, the equipment has a small volume and is easy to carry; for cutting thick plates with large current, generally water is used, and the cooling effect is good; the cooling medium is introduced into the cooling chamber 32 from the refrigerant inlet 36 to cool the ionization chamber 32 and flows out from the refrigerant outlet 37; when cutting, the nozzle 3 of the cutting torch 8 is brought close to or directly in contact with (when directly in contact, the nozzle 3 is easily burned out by the rebounding molten metal, and the nozzle 3 is frequently damaged. Currently, the close approach method is mostly used. The distance between the nozzle 3 and the workpiece 4 is the cutting distance, and the cutting distance is generally 5 - 8 mm. At this time, an arc-drawing line is required) the workpiece 4 (conductive metal material). At this time, the workpiece 4 is connected to the positive pole of the power supply 1 through a grounding wire. During the process, due to the relatively large resistance value of the resistor 2, a circuit is formed between the nozzle 3 and the workpiece 4, and the plasma arc generated in the ionization chamber 31 sprays out from the arc outlet 34, so that under the high temperature and the blowing of the air flow, the cutting process of the workpiece 4 is realized.

[0029] As Figure 2-7 shown in the figure, on the basis of the above-mentioned existing technology, the present utility model improves the cutting torch 8. In this embodiment, a guiding device is fixedly installed on the workpiece 4. Among them, a guiding plate 5 is arranged in the guiding device. The guiding plate 5 is fixed on the workpiece 4 through fixing parts 6 at both ends, and a connecting device 7 is slidably connected in the guiding plate 5 and is fixedly connected to the cutting torch 8 through the connecting device 7.

[0030] Among them, a sliding groove 51 is arranged in the guiding plate 5, and sealing heads 52 are installed at both ends of the guiding plate 5. Both ends of the guiding plate 5 extend to the outside of the workpiece 4, and fixing parts 6 are sleeved at both ends of the guiding plate 5. Among them, a lower clamping plate 61 is arranged in the fixing part 6. The lower clamping plate 61 is connected to the upper clamping plate 63 through a connecting rod 62. The length of the lower clamping plate 61 is longer than that of the upper clamping plate 63, and a "mouth"-shaped fixing hole 64 is formed between the lower clamping plate 61 and the upper clamping plate 63 through the connecting rod 62. The fixing hole 64 is in plug-in fit with the guiding plate 5. A bolt hole 65 is arranged on the upper clamping plate 63, and a fastening bolt 66 is installed and connected in the bolt hole 65. The lower end of the fastening bolt 66 extends and abuts against the lower bottom plate of the sliding groove 51.

[0031] The guide plate 5 is slidably connected to the connecting device 7, wherein the slide groove 51 is in an "inverted T" shape, a connecting block 71 is provided in the connecting device 7, an "inverted T" shaped slider 72 is provided below the connecting block 71, the slider 72 cooperates with the slide groove 51, and a roller 73 is installed below the slider 72, a square connecting hole 74 is provided on one side of the connecting block 71, a connecting square connecting portion 81 is fixedly connected to the cutting gun 8, and the connecting portion 81 cooperates with the connecting hole 74; an installation cavity 75 is provided in the connecting block 71, wherein the installation cavity 75 is provided in the installation cavity 75 ... A locking device 76 is installed in the cavity 75, and a connecting plate 761 is provided in the locking device 76. A locking portion 762 is connected to the lower part of the connecting plate 761, and a matching groove 811 is provided on the connecting portion 81. The matching groove 811 matches with the locking portion 762, and a hand-holding portion 763 is connected above the connecting plate 761. An annular plate 765 is fixedly connected above the mounting cavity 75, and the hand-holding portion 763 extends to the upper part of the annular plate 765. A spring 764 is fixedly connected between the annular plate 765 and the connecting plate 761.

[0032] The principle of this utility model is:

[0033] The utility model sets a guiding device, so that during the cutting process, the cutting distance between the cutting gun 8 and the surface of the workpiece 4 and the movement path of the cutting gun 8 can be limited, so as to cut a cutting surface with a better shape. The utility model does not make any improvement on the existing parts such as the chassis, air pump, grounding wire, and cooling system that match the cutting gun in the utility model, so they will not be elaborated in detail. At the same time, in the above-mentioned figure description, the principle of the plasma cutter in the prior art is described in detail, which should not be difficult for technical personnel in this field to understand. Therefore, the structure and principle of the plasma cutter will not be repeated in the utility model.

[0034] For the improved part of the utility model, the guide bar 5 is placed on the workpiece 4 during use. In the attached drawings of the embodiment of the utility model, the guide bar 5 is straight because the commonly used cutting is generally straight line cutting. However, it should be noted that it can be set to different shapes as needed during the process, such as curved and circular shapes. For those skilled in the art, the above simple deformation should also fall within the protection scope of the utility model without departing from the core technical solution of the utility model.

[0035] The two sides of the guide plate 5 need to extend outward from the workpiece 4. During the process, the guide plate 5 is fixed by the fixing member 6, wherein the length of the lower clamping plate 61 is longer than the length of the upper clamping plate 63. During the process, it is necessary to ensure that the cutting gun 8 driven by the connecting block 71 can completely cut the workpiece 4, that is, the horizontal distance between the upper clamping plate 63 and the workpiece 4 is greater than the radial length of the connecting block 761 (for the embodiment of the utility model attached Figure 2As shown in the figure, the upper clamping plate 63 at the inner end of the paper can be flush with the workpiece 4, but the outer end of the paper needs to be larger than the radial length of the connection 761. In actual use, the distance needs to be reasonably adjusted according to the actual size of the connection block 761 and the cutting gun 8 to ensure that the cutting gun 8 can completely cut the workpiece 4).

[0036] After the guide plate 5 is fixed, the cutting gun 8 is connected to the connecting block 71. During the process, the hand-held part 763 is pulled up, so that the locking part 762 can be lifted up. At this time, the connecting part 81 connected to the cutting gun 8 is inserted into the connecting hole 74, and then the hand-held part 763 is released. At this time, the locking part 762 moves downward under the drive of the spring 764 to cooperate with the matching groove 811 to prevent the cutting gun 8 from moving. When taking out the cutting gun 8, the hand-held part 763 is lifted up and the cutting gun 8 is pulled out. The cutting gun 8 is connected to the connecting block 71, and the distance between the nozzle 3 of the cutting gun 8 and the surface of the workpiece 4, that is, the cutting distance, is maintained at 5~8mm.

Claims

1. A novel plasma cutter, comprising a chassis and a cutting gun (8), wherein the chassis is connected to a grounding wire, a grounding wire and the cutting gun (8), and the cutting gun (8) is connected to a refrigeration system and an air intake pump, characterized in that: A connecting portion (81) is provided on one side of the cutting gun (8), and is detachably connected to a guide device through the connecting portion (81), and the guide device is detachably fixedly connected to a workpiece (4); the guide device comprises a guide plate (5), and both ends of the guide plate (5) are detachably fixedly connected to the workpiece (4); a connecting device (7) is slidably mounted on the guide plate (5), and the connecting device (7) is detachably fixedly connected to the cutting gun (8).

2. A novel plasma cutter according to claim 1, characterized in that: The two ends of the guide plate (5) are sleeved with fixing members (6), and the two ends of the guide plate (5) are detachably fixedly connected to the workpiece (4) through the fixing members (6); a lower clamping plate (61) is arranged in the fixing member (6), and the lower clamping plate (61) is connected to the upper clamping plate (63) through a connecting rod (62), and the length of the lower clamping plate (61) is longer than the length of the upper clamping plate (63); a "mouth"-shaped fixing hole (64) is formed between the lower clamping plate (61) and the upper clamping plate (63) through the connecting rod (62), and the two ends of the guide plate (5) are inserted into the fixing hole (64), the lower clamping plate (61) is matched with the lower bottom surface of the workpiece (4), and a bolt hole (65) is opened on the upper clamping plate (63), and a fastening bolt (66) is connected through the bolt hole (65), and the fastening bolt (66) is matched with the guide plate (5).

3. A novel plasma cutter according to claim 2, characterized in that: The guide plate (5) is provided with a slide groove (51), and the connecting device (7) is slidably installed in the slide groove (51); a connecting block (71) is provided in the connecting device (7), and is connected to a slide block (72) below the connecting block (71), and the slide block (72) cooperates with the slide groove (51); a connecting hole (74) is provided on one side of the connecting block (71), and is detachably connected to a connecting portion (81) on one side of the cutting gun (8) through the connecting hole (74).

4. A novel plasma cutter according to claim 3, characterized in that: The horizontal distance between the upper clamping plate (63) and the workpiece (4) is greater than the length of the side where the connecting block (71) is connected to the cutting gun (8).

5. A novel plasma cutter according to claim 3, characterized in that: A roller (73) is installed at the bottom of the sliding block (72), and the roller (73) matches the lower bottom surface of the sliding groove (51).

6. A novel plasma cutter according to claim 3, characterized in that: The connecting block (71) is provided with a mounting cavity (75), the mounting cavity (75) being in communication with the connecting hole (74), a locking device (76) being installed in the mounting cavity (75), a locking portion (762) being provided in the locking device (76) which reciprocates up and down, a matching groove (811) being provided on the connecting portion (81), and the locking portion (762) matching with the matching groove (811).

7. A novel plasma cutter according to claim 6, characterized in that: The locking device (76) is provided with a connecting plate (761), the locking portion (762) is provided below the connecting plate (761), an annular plate (765) with a hole is provided above the connecting plate (761), the hand-held portion (763) passes through the annular plate (765) and is connected to the top of the connecting plate (761), a spring (764) is fixedly installed between the annular plate (765) and the connecting plate (761), and the annular plate (765) is fixedly installed above the installation cavity (75).

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