Nozzle structure of plasma cutting gun

Abstract

The utility model discloses a spray nozzle structure of a plasma cutting gun, which comprises a cutting gun connecting seat, an electrode and a spray nozzle main body, the electrode is connected with the cutting gun connecting seat and is suitable for generating plasma arc, the spray nozzle main body is connected with the cutting gun connecting seat, a mounting cavity is arranged in the spray nozzle main body, and the spray nozzle main body is arranged in the mounting cavity. A mounting cavity is formed in the nozzle body, the electrode is located in the mounting cavity, the peripheral surface of the electrode abuts against the inner wall of the mounting cavity, a plurality of first shrinking mechanisms distributed circumferentially and upper sealing blocks corresponding to the first shrinking mechanisms are arranged in the nozzle body, and the first shrinking mechanisms are connected with the corresponding upper sealing blocks; an inclined face is arranged at the top of the upper sealing block, the upper sealing block is suitable for being extruded by the electrode and abuts against the peripheral face of the upper half portion of the electrode, the electrode, the nozzle and the cutting gun connecting base are closely connected and limited by one another through the auxiliary limiting mechanism, and therefore the connecting stability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cutting gun nozzle technical field, specifically, relate to a nozzle structure of plasma cutting gun. BACKGROUND

[0002] At present, in the field of plasma cutting technology, as the key equipment, the design of the nozzle structure of the plasma cutting gun is crucial to the cutting effect and operation stability, the traditional plasma cutting gun nozzle and the connecting mode between the spray gun mainly adopt threaded fastening, this connecting mode although guarantees the connecting strength of the nozzle and the spray gun to some extent, but also brings some unavoidable problems.

[0003] Through the retrieval, it is found that the authorized announcement no. CN216065960U of Chinese utility model patent discloses a kind of integrated electrode nozzle with flow guide groove structure of plasma cutting gun, the inner nozzle and outer nozzle of this patent adopt the strengthening structure of different metal materials, enhance the high-temperature resistance and cost benefit, and realize plasma arc focusing using compression channel, simultaneously, heat sink prolongs nozzle life, connecting mechanism is convenient to install, and limiting design enhances the connection tightness, reduces processing difficulty, improves production efficiency;However, the strengthening structure of the patent is actually the plug-in cooperation between limiting groove and limiting strip, to realize the butt joint between nozzle and cutting gun connecting seat, the effect realized is still dependent on the threaded connection between nozzle and cutting gun connecting seat, when threaded connection appears loose, the cooperation effect between limiting groove and limiting strip will be poor, therefore, the butt joint effect is not obvious. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem in prior art, by setting up auxiliary limiting mechanism, electrode, nozzle and cutting gun connecting seat are closely related, and are limited to each other, so as to improve the stability of connection.

[0005] In order to solve the above technical problems, the technical scheme of the utility model is a kind of nozzle structure of plasma cutting gun, including:

[0006] Cutting gun connecting seat;

[0007] Electrode, the electrode is connected with the cutting gun connecting seat, and the electrode is suitable for generating plasma arc;

[0008] Nozzle main body, the nozzle main body is connected with the cutting gun connecting seat, the installation cavity is set in the nozzle main body, the electrode is located in the installation cavity, and the outer circumferential surface of the electrode is in abutment with the inner wall of the installation cavity;

[0009] The nozzle body is provided with a plurality of circumferentially distributed first contraction mechanisms and upper sealing blocks corresponding to the first contraction mechanisms, the first contraction mechanisms are connected with the corresponding upper sealing blocks, the top of the upper sealing block is provided with an inclined surface, the upper sealing block is adapted to be extruded by the electrode and abuts against the outer circumferential surface of the upper half of the electrode, and the upper sealing block abuts against the inner wall of the mounting cavity after being extruded by the electrode.

[0010] The first contraction mechanism is adapted to generate a pushing force on the upper sealing block after being extruded and apply the pushing force on the outer circumferential surface of the electrode in contact with the upper sealing block.

[0011] Further, the nozzle body is provided with a threaded portion, the cutting gun connecting seat is provided with a threaded groove matched with the threaded portion, and the nozzle body and the cutting gun connecting seat are threadedly connected.

[0012] Further, the nozzle body is provided with a rubber sleeve, the rubber sleeve and the threaded portion form a docking space, the bottom of the cutting gun connecting seat is inserted into the docking space, and the portion of the cutting gun connecting seat inserted into the docking space extrudes the rubber sleeve.

[0013] Further, the first contraction mechanism comprises an upper limiting block and a first spring, the inner wall of the mounting cavity is provided with a plurality of first sealing grooves, first limiting grooves and first contraction grooves corresponding to the positions of the upper sealing blocks, and the first sealing grooves, the first limiting grooves and the first contraction grooves are communicated.

[0014] The upper sealing block is slidably arranged in the first sealing groove, the upper limiting block is slidably arranged in the first limiting groove, and the first spring is arranged in the first contraction groove, one end of the upper limiting block is connected with the first spring, the other end of the upper limiting block is connected with one end of the upper sealing block, and the other end of the upper sealing block is adapted to abut against the outer circumferential surface of the upper half of the electrode.

[0015] Further, a plurality of moving grooves corresponding to the first contraction mechanisms are formed in the nozzle body, one end of the moving groove is communicated with the first limiting groove, and the other end of the moving groove is communicated with the docking space.

[0016] The moving groove is L-shaped, an extrusion plate is slidably arranged in the moving groove, one end of the extrusion plate is located at the first limiting groove and connected with the upper limiting block, and the other end of the extrusion plate is located at the docking space.

[0017] The extrusion plate is adapted to move along with the upper limiting block when the upper limiting block is extruded by the electrode, and one end of the extrusion plate located at the docking space protrudes into the docking space from the moving groove, thereby extruding the part of the cutting gun connecting seat inserted into the docking space.

[0018] Further, a plurality of circumferentially distributed second contraction mechanisms and corresponding lower sealing blocks are arranged in the nozzle body, the second contraction mechanisms are connected with the corresponding lower sealing blocks, the top of the lower sealing block is provided with an inclined surface, the lower sealing block is adapted to be extruded by the electrode and abut against the outer circumferential surface of the lower half of the electrode, and the lower sealing block is adapted to be in close contact with the inner wall of the installation cavity after being extruded by the electrode.

[0019] The second contraction mechanism is adapted to generate a pushing force on the lower sealing block after being extruded, and the pushing force is applied to the outer circumferential surface of the electrode in contact with the lower sealing block.

[0020] Further, the second contraction mechanism includes a lower limiting block and a second spring, a plurality of second sealing grooves, second limiting grooves and second contraction grooves corresponding to the positions of the lower sealing blocks are opened in the inner wall of the installation cavity, and the second sealing grooves, the second limiting grooves and the second contraction grooves are communicated.

[0021] The lower sealing block is slidably arranged in the second sealing groove, the lower limiting block is slidably arranged in the second limiting groove, and the second spring is arranged in the second contraction groove, one end of the second spring is connected with the lower limiting block, the other end of the lower limiting block is connected with one end of the lower sealing block, and the other end of the lower sealing block is adapted to be in contact with the outer circumferential surface of the lower half of the electrode.

[0022] Further, a through hole is opened in the lower limiting block, the through hole is communicated with the second contraction groove, and a plurality of heat dissipation holes corresponding to the second contraction groove are opened in the nozzle body, one end of the heat dissipation hole is communicated with the second contraction groove, and the other end of the heat dissipation hole is communicated with the external space of the nozzle body.

[0023] Further, a flow guide mechanism is arranged in the nozzle body, the flow guide mechanism includes a vertical flow guide channel, a first compression channel and a second compression channel.

[0024] The vertical flow guide channel, the first compression channel and the second compression channel are communicated, the vertical flow guide channel is communicated with the internal space of the electrode, and the second compression channel is communicated with the external space of the nozzle body.

[0025] The vertical flow guide channel is provided with a plurality of circumferentially distributed shunt mechanisms, the shunt mechanism comprises a horizontal shunt channel, a third compression channel and a converging channel;

[0026] The horizontal shunt channel, the third compression channel and the converging channel are communicated, the horizontal shunt channel is connected with the vertical flow guide channel, and the converging channel is connected with the second compression channel

[0027] Further, the bottom of the nozzle body is provided with a baffle, and a plurality of shunt holes are formed in the baffle and penetrate through the baffle and are circumferentially distributed.

[0028] By adopting the above technical scheme, the utility model has the following beneficial effects:

[0029] 1. By arranging the upper sealing block and the extrusion plate, the electrode is extruded against the upper sealing block when inserted into the nozzle body, the upper sealing block is extruded against the electrode by the reaction force provided by the first spring, thereby realizing the butt joint between the nozzle body and the electrode, even if the nozzle body and the cutting gun connecting seat are loose, the nozzle body will not be directly loose, and the extrusion plate will move along with the upper sealing block after being extruded and abut against the inner wall of the cutting gun connecting seat, thereby realizing the second limiting.

[0030] 2. By arranging the lower sealing block and the heat dissipation hole, the electrode is extruded against the lower sealing block when inserted into the nozzle body, the lower sealing block is extruded against the electrode by the reaction force provided by the second spring, thereby further strengthening the butt joint between the nozzle body and the electrode, and the lower sealing block is located in the lower half of the electrode, which is excessively heated during cutting, so that the heat received by the electrode can be transferred to the heat dissipation hole through the lower sealing block, thereby realizing certain heat dissipation effect.

[0031] 3. By arranging the horizontal shunt channel and the third compression channel, a plurality of horizontal shunt channels are circumferentially distributed to shunt the plasma arc generated by the electrode, and the shunted arc is further compressed through the third compression channel, and then the compressed arc is converged into the second compression channel through the converging channel, and finally sprayed out of the nozzle body, so that the plasma arc can be compressed and shunted multiple times, thereby improving the concentration of the arc and the cutting efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0033] Figure 2 It is a schematic diagram of the butt joint of the nozzle body and the cutting gun connecting seat of the utility model;

[0034] Figure 3 It is a schematic diagram of the position of the electrode of the utility model;

[0035] Figure 4 It is the nozzle main body internal structure schematic view of the utility model;

[0036] Figure 5 It is the nozzle main body internal structure schematic view of the utility model; Figure 4 It is the enlarged view of A in the middle;

[0037] Figure 6 It is the nozzle main body internal structure schematic view of the utility model; Figure 4 It is the enlarged view of B in the middle;

[0038] Figure 7 It is the nozzle main body sectional view of the utility model;

[0039] Figure 8 It is the nozzle main body internal structure schematic view of the utility model; Figure 7 It is the enlarged view of C in the middle.

[0040] In the drawing: 1, cutting gun connecting seat;2, nozzle main body;3, electrode;4, rubber sleeve;5, threaded part;6, first sealing groove;7, first limiting groove;8, first shrinkage groove;9, upper sealing block;10, upper limiting block;11, first spring;12, moving groove;13, extrusion plate;14, second sealing groove;15, second limiting groove;16, second shrinkage groove;17, lower sealing block;18, lower limiting block;19, second spring;20, round hole;21, heat dissipation hole;22, vertical flow channel;23, first compression channel;24, second compression channel;25, horizontal shunt channel;26, third compression channel;27, collection channel;28, baffle;29, shunt hole. DETAILED DESCRIPTION

[0041] In order to make the content of the utility model more easily be clearly understood, the following according to specific embodiment and combining with the drawing, the utility model is further detailed.

[0042] Example one

[0043] As Figures 1-5 Shown, a kind of nozzle structure of plasma cutting torch, comprising:

[0044] Cutting gun connecting seat 1;

[0045] Electrode 3, electrode 3 is connected with cutting gun connecting seat 1, electrode 3 is suitable for generating plasma arc;

[0046] Nozzle main body 2, nozzle main body 2 is connected with cutting gun connecting seat 1, nozzle main body 2 is provided with installation cavity, electrode 3 is located in installation cavity, the outer periphery of electrode 3 and the inner wall of installation cavity are in abutment;

[0047] The nozzle body 2 is provided with a plurality of circumferentially distributed first contraction mechanisms and upper sealing blocks 9 corresponding to the first contraction mechanisms. The first contraction mechanisms are connected with the corresponding upper sealing blocks 9. The top of the upper sealing block 9 is provided with an inclined surface. The upper sealing block 9 is adapted to be extruded by the electrode 3 and abut against the outer circumferential surface of the upper half of the electrode 3. The upper sealing block 9 is in abutment with the inner wall of the mounting cavity after being extruded by the electrode 3.

[0048] The first contraction mechanism is adapted to generate a pushing force on the upper sealing block 9 after being extruded and apply the pushing force on the outer circumferential surface of the electrode 3 in contact with the upper sealing block 9.

[0049] As shown in Figure 2 , the nozzle body 2 is provided with a threaded portion 5. The cutting gun connecting seat 1 is provided with a threaded groove matched with the threaded portion 5. The nozzle body 2 is threadedly connected with the cutting gun connecting seat 1.

[0050] As shown in Figure 5 , the nozzle body 2 is provided with a rubber sleeve 4. The rubber sleeve 4 and the threaded portion 5 form a docking space. The bottom of the cutting gun connecting seat 1 is inserted into the docking space. The portion of the cutting gun connecting seat 1 inserted into the docking space extrudes the rubber sleeve 4.

[0051] As shown in Figure 5 , the first contraction mechanism includes an upper limiting block 10 and a first spring 11. The inner wall of the mounting cavity is provided with a plurality of first sealing grooves 6, first limiting grooves 7 and first contraction grooves 8 corresponding to the positions of the upper sealing blocks 9. The first sealing grooves 6, the first limiting grooves 7 and the first contraction grooves 8 are communicated.

[0052] The upper sealing block 9 is slidably arranged in the first sealing groove 6. The upper limiting block 10 is slidably arranged in the first limiting groove 7. The first spring 11 is arranged in the first contraction groove 8. One end of the first spring 11 is connected with the upper limiting block 10. The other end of the upper limiting block 10 is connected with one end of the upper sealing block 9. The other end of the upper sealing block 9 is adapted to be in contact with the outer circumferential surface of the upper half of the electrode 3.

[0053] As shown in Figure 5 , the nozzle body 2 is provided with a plurality of moving grooves 12 corresponding to the first contraction mechanisms. One end of the moving groove 12 is communicated with the first limiting groove 7. The other end of the moving groove 12 is communicated with the docking space.

[0054] The moving groove 12 is L-shaped. An extrusion plate 13 is slidably arranged in the moving groove 12. One end of the extrusion plate 13 is located at the first limiting groove 7 and connected with the upper limiting block 10. The other end of the extrusion plate 13 is located at the docking space.

[0055] The extrusion plate 13 is adapted to move along with the upper limiting block 10 when the upper limiting block 10 is extruded by the electrode 3, and one end of the extrusion plate 13 located at the docking space extends into the docking space through the moving groove 12, thereby extruding the part of the cutting gun connecting seat 1 inserted into the docking space.

[0056] As shown in Figure 4 , Figures 6-7 , the nozzle body 2 is provided with a plurality of circumferentially distributed second contraction mechanisms and corresponding lower sealing blocks 17, the second contraction mechanisms are connected with the corresponding lower sealing blocks 17, the top of the lower sealing block 17 is provided with an inclined surface, the lower sealing block 17 is adapted to be extruded by the electrode 3 and abut against the outer circumferential surface of the lower half of the electrode 3, and the lower sealing block 17 is adapted to be in close contact with the inner wall of the mounting cavity after being extruded by the electrode 3.

[0057] The second contraction mechanism is adapted to generate a pushing force on the lower sealing block 17 after being extruded, and the pushing force is applied to the outer circumferential surface of the electrode 3 in contact with the lower sealing block 17.

[0058] As shown in Figures 6-7 , the second contraction mechanism includes a lower limiting block 18 and a second spring 19, the inner wall of the mounting cavity is provided with a plurality of second sealing grooves 14, second limiting grooves 15 and second contraction grooves 16 corresponding to the positions of the lower sealing blocks 17, and the second sealing grooves 14, the second limiting grooves 15 and the second contraction grooves 16 are communicated.

[0059] The lower sealing block 17 is slidably arranged in the second sealing groove 14, the lower limiting block 18 is slidably arranged in the second limiting groove 15, and the second spring 19 is arranged in the second contraction groove 16, one end of the second spring 19 is connected with the lower limiting block 18, the other end of the lower limiting block 18 is connected with one end of the lower sealing block 17, and the other end of the lower sealing block 17 is adapted to be in contact with the outer circumferential surface of the lower half of the electrode 3.

[0060] As shown in Figure 6 , Figure 7 , the lower limiting block 18 is provided with a through hole 20, the through hole 20 is communicated with the second contraction groove 16, and the nozzle body 2 is provided with a plurality of heat dissipation holes 21 corresponding to the second contraction groove 16, one end of the heat dissipation hole 21 is communicated with the second contraction groove 16, and the other end of the heat dissipation hole 21 is communicated with the external space of the nozzle body 2.

[0061] The working principle of the embodiment is as follows:

[0062] The cutting gun connecting seat 1 needs to be docked with the electrode 3 before connecting the nozzle body 2, and the electrode 3 can be directly docked with the cutting gun connecting seat 1 through threads. After the electrode 3 is installed, the nozzle body 2 is installed, first, the nozzle body 2 is inserted into the cutting gun connecting seat 1, and the inner threads in the cutting gun connecting seat 1 and the threaded part 5 on the nozzle body 2 are matched, so that the nozzle body 2 and the cutting gun connecting seat 1 are connected through threads to realize one-time positioning;

[0063] After the threaded connection, the bottom of the cutting gun connecting seat 1 is inserted into the docking space between the rubber sleeve 4 and the threaded part 5. When inserted into the docking space, the insertion part of the cutting gun connecting seat 1 will cause the rubber sleeve 4 to be extruded. The rubber is an elastic material, and the force generated by the rebound after being extruded acts on the insertion part of the cutting gun connecting seat 1 to realize two-time positioning;

[0064] During the threaded connection of the cutting gun connecting seat 1 and the nozzle body 2, the electrode 3 is inserted into the installation cavity in the nozzle body 2. A plurality of circumferentially distributed upper sealing blocks 9 are arranged in the installation cavity. The upper sealing blocks 9 extend to the inner wall of the installation cavity in the initial state. When the electrode 3 is inserted, the upper sealing blocks 9 will be extruded. The top of the upper sealing block 9 is provided with an inclined surface, so that the extrusion process of the electrode on the upper sealing block 9 is more smooth and will not damage the electrode 3. After being extruded, the upper sealing block 9 moves to the inside of the first sealing groove 6 and is attached to the inner wall of the installation cavity, reducing the gap between the electrode 3 and the installation cavity. When the upper sealing block 9 moves in the first sealing groove 6, it extrudes the upper limiting block 10 to move in the first limiting groove 7, and at the same time extrudes the first spring 11 to compress in the first contraction groove 8. After being extruded, the first spring 11 generates a counterforce to push the upper sealing block 9 firmly against the outer circumferential surface of the electrode 3, thereby realizing the third-time positioning. It should be noted that the position of the upper sealing block 9 is located on the outer circumferential surface of the upper half of the electrode 3;

[0065] When the upper sealing block 9 is extruded and moves in the first sealing groove 6, the extrusion plate 13 is moved in the moving groove 12 by the upper limiting block 10, so that one end of the extrusion plate 13 extends to the outside of the moving groove 12 and enters the docking space, extruding the part of the cutting gun connecting seat 1 inserted into the docking space, thereby realizing the fourth-time positioning. The part of the cutting gun connecting seat 1 that is extruded after being extruded again extrudes the rubber sleeve 4, and the counterforce of the rubber sleeve 4 on the cutting gun connecting seat 1 is strengthened, thereby realizing the fifth-time positioning;

[0066] At the same time of the above process, a plurality of circumferentially distributed lower sealing blocks 17 are also arranged in the installation cavity, which are extended to the inner wall of the installation cavity in the initial state, and are pressed by the electrode 3 when the electrode 3 is inserted. The top of the lower sealing block 17 is provided with an inclined surface, so that the electrode 3 is more smoothly pressed against the lower sealing block 17 and will not damage the electrode 3. After being pressed, the lower sealing block 17 moves to the inside of the second sealing groove 14 and is attached to the inner wall of the installation cavity, reducing the gap between the electrode 3 and the installation cavity. When the lower sealing block 17 moves in the second sealing groove 14, it presses the lower limiting block 18 to move in the second limiting groove 15, and at the same time, it presses the second spring 19 to compress in the second contraction groove 16. After being pressed, the second spring 19 generates a reaction force to push the lower sealing block 17 against the outer circumferential surface of the electrode 3, thereby achieving the sixth limiting. It should be noted that the position of the lower sealing block 17 is below the outer circumferential surface of the lower half of the electrode 3. The working principle of the lower sealing block 17 is the same as that of the upper sealing block 9, except that the upper and lower sealing blocks 17 contact the outer circumferential surface of the electrode 3 at different positions.

[0067] In addition, unlike the upper limiting plate, the lower limiting plate is provided with a circular hole 20 extending through itself. The nozzle body 2 is also provided with a heat dissipation hole 21. The circular hole 20, the second contraction groove 16 and the heat dissipation hole 21 correspond to each other and are in communication. The heat dissipation hole 21 is in communication with the air outside. During operation, the air outside can flow in the circular hole 20 through the heat dissipation hole 21. The lower sealing block 17 contacts the outer circumferential surface of the electrode 3 to generate a heat transfer effect. The heat generated by the lower sealing block 17 after being heated can be carried away by the air in the circular hole 20 of the lower limiting block 18, thereby achieving a certain heat dissipation effect without the need for additional heat dissipation agents, and the structure is simple and the cost is low.

[0068] Embodiment Two

[0069] As shown in Figures 7-8 , the present embodiment further comprises the following structure on the basis of embodiment one: the nozzle body 2 is provided with a flow guiding mechanism, which comprises a vertical flow guiding channel 22, a first compression channel 23 and a second compression channel 24.

[0070] The vertical flow guiding channel 22, the first compression channel 23 and the second compression channel 24 are in communication. The vertical flow guiding channel 22 is in communication with the internal space of the electrode 3. The second compression channel 24 is in communication with the external space of the nozzle body 2.

[0071] A plurality of circumferentially distributed flow distribution mechanisms are arranged on the vertical flow guiding channel 22. The flow distribution mechanism comprises a horizontal flow distribution channel 25, a third compression channel 26 and a collection channel 27.

[0072] The horizontal shunt passage 25, the third compression passage 26 and the converging passage 27 are communicated, the horizontal shunt passage 25 is connected with the vertical guide passage 22, and the converging passage 27 is connected with the second compression passage 24.

[0073] As shown in the drawings, the bottom of the nozzle body 2 is provided with a baffle 28, and a plurality of shunt holes 29 are formed in the baffle 28. Figures 7-8

[0074] The working principle of the embodiment is as follows:

[0075] After the nozzle body 2 and the cutting torch connecting seat 1 are connected, the nozzle body 2, the cutting torch connecting seat 1 and the electrode 3 are mutually restricted and connected, and any loose connection will not directly cause the nozzle body 2 to be loose or even fall off.

[0076] When the cutting work starts, the plasma arc is generated between the cutting torch body and the electrode 3, and the working principle of this part is the prior art, which will not be described in detail here. After the plasma electrode passes through the vertical guide passage 22, the arc is compressed by the first compression passage 23 and the second compression passage 24, and then discharged outside the nozzle body 2 to cut the object to be cut.

[0077] In addition, a plurality of horizontal shunt passages 25 are arranged in the vertical guide passage 22 to shunt the plasma arc, and the shunted plasma arc is further compressed by the third compression passage 26 corresponding to each horizontal shunt passage 25, and then all the compressed plasma arcs are converged into the second compression passage 24 to complete the arc, and finally discharged and cut. Through multiple shunting and compression arc working, the effect of plasma cutting is improved.

[0078] Meanwhile, the baffle 28 is arranged at the bottom of the nozzle body 2, which can avoid the direct contact between the nozzle and the steel plate to be cut and the like, so as to avoid the phenomenon of burning the nozzle. Meanwhile, the shunt hole 29 is arranged on the baffle 28, which can discharge part of the heat and the iron filings or slag generated during cutting, so as to avoid affecting the nozzle and the electrode 3, and plays a protective role.

[0079] The above-described specific embodiments further illustrate the technical problems solved by the utility model, technical solutions and beneficial effects, and it should be understood that the above-described specific embodiments are only for the utility model and do not limit the utility model. Any modification, equivalent replacement, improvement and the like made within the spirit and principles of the utility model should be included in the protection scope of the utility model.​

Claims

1. A nozzle structure for a plasma cutting gun, characterized in that: include: Cutting gun connector (1); Electrode (3), which is connected to the cutting gun connector (1), and the electrode (3) is adapted to generate a plasma arc; Nozzle body (2), the nozzle body (2) is connected to the cutting gun connecting seat (1), the nozzle body (2) is provided with a mounting cavity, the electrode (3) is located in the mounting cavity, and the outer peripheral surface of the electrode (3) abuts against the inner wall of the mounting cavity; The nozzle body (2) is provided with a plurality of circumferentially distributed first contraction mechanisms and upper sealing blocks (9) corresponding to the first contraction mechanisms. The first contraction mechanisms are connected to the corresponding upper sealing blocks (9). The top of the upper sealing block (9) is provided with an inclined surface. The upper sealing block (9) is adapted to be squeezed by the electrode (3) and abuts against the outer peripheral surface of the upper half of the electrode (3). After being squeezed by the electrode (3), the upper sealing block (9) fits against the inner wall of the mounting cavity. The first contraction mechanism is adapted to generate a thrust on the upper sealing block (9) after being squeezed, and to apply the thrust to the outer peripheral surface of the electrode (3) that is in contact with the upper sealing block (9).

2. The nozzle structure of the plasma cutting gun according to claim 1, characterized in that, The nozzle body (2) is provided with a threaded part (5), and the cutting gun connecting seat (1) is provided with a threaded groove that cooperates with the threaded part (5). The nozzle body (2) and the cutting gun connecting seat (1) are threadedly connected.

3. The nozzle structure of the plasma cutting gun according to claim 2, characterized in that, A rubber sleeve (4) is provided on the nozzle body (2), and a mating space is formed between the rubber sleeve (4) and the threaded part (5). The bottom of the cutting gun connecting seat (1) is inserted into the mating space, and the part of the cutting gun connecting seat (1) inserted into the mating space causes compression to the rubber sleeve (4).

4. The nozzle structure of the plasma cutting gun according to claim 3, characterized in that, The first shrinkage mechanism includes an upper limit block (10) and a first spring (11). The inner wall of the mounting cavity is provided with a plurality of first sealing grooves (6), first limiting grooves (7) and first shrinkage grooves (8) corresponding to the positions of the upper sealing block (9). The first sealing grooves (6), first limiting grooves (7) and first shrinkage grooves (8) are connected. The upper sealing block (9) is slidably disposed in the first sealing groove (6), the upper limit block (10) is slidably disposed in the first limiting groove (7), the first spring (11) is disposed in the first contraction groove (8), the first spring (11) is connected to one end of the upper limit block (10), the other end of the upper limit block (10) is connected to one end of the upper sealing block (9), and the other end of the upper sealing block (9) is adapted to contact the outer peripheral surface of the upper half of the electrode (3).

5. The nozzle structure of the plasma cutting gun according to claim 4, characterized in that, The nozzle body (2) is provided with a plurality of moving grooves (12) corresponding to the first contraction mechanism. One end of the moving groove (12) is connected to the first limiting groove (7), and the other end of the moving groove (12) is connected to the docking space. The moving groove (12) is L-shaped, and a pressing plate (13) is slidably disposed in the moving groove (12). The pressing plate (13) is located at the first limiting groove (7) and connected to the upper limiting block (10). The other end of the pressing plate (13) is located at the docking space. The extrusion plate (13) is adapted to move along with the upper limit block (10) when the upper limit block (10) is extruded by the electrode (3), and one end of the extrusion plate (13) located in the docking space extends out of the moving groove (12) into the docking space, thereby extruding the part of the cutting gun connector (1) inserted into the docking space.

6. The nozzle structure of the plasma cutting gun according to claim 1 or 5, characterized in that, The nozzle body (2) is provided with a plurality of circumferentially distributed second contraction mechanisms and a lower sealing block (17) corresponding to the second contraction mechanism. The second contraction mechanism is connected to the corresponding lower sealing block (17). The top of the lower sealing block (17) is provided with an inclined surface. The lower sealing block (17) is adapted to be squeezed by the electrode (3) and abuts against the outer peripheral surface of the lower half of the electrode (3). After being squeezed by the electrode (3), the lower sealing block (17) fits against the inner wall of the mounting cavity. The second contraction mechanism is adapted to generate a thrust on the lower sealing block (17) after being squeezed, and to apply the thrust to the outer peripheral surface of the electrode (3) in contact with the lower sealing block (17).

7. The nozzle structure of the plasma cutting gun according to claim 6, characterized in that, The second shrinkage mechanism includes a lower limit block (18) and a second spring (19). The inner wall of the mounting cavity is provided with a plurality of second sealing grooves (14), second limit grooves (15) and second shrinkage grooves (16) corresponding to the position of the lower sealing block (17). The second sealing grooves (14), second limit grooves (15) and second shrinkage grooves (16) are connected. The lower sealing block (17) is slidably disposed in the second sealing groove (14), the lower limiting block (18) is slidably disposed in the second limiting groove (15), the second spring (19) is disposed in the second contraction groove (16), the second spring (19) is connected to one end of the lower limiting block (18), the other end of the lower limiting block (18) is connected to one end of the lower sealing block (17), and the other end of the lower sealing block (17) is adapted to contact the outer peripheral surface of the lower half of the electrode (3).

8. The nozzle structure of the plasma cutting gun according to claim 7, characterized in that, The lower limit block (18) has a through hole (20) that communicates with the second contraction groove (16). The nozzle body (2) has several heat dissipation holes (21) that correspond to the second contraction groove (16). One end of the heat dissipation hole (21) communicates with the second contraction groove (16), and the other end of the heat dissipation hole (21) communicates with the external space of the nozzle body (2).

9. The nozzle structure of the plasma cutting gun according to claim 1 or 8, characterized in that, The nozzle body (2) is provided with a flow guiding mechanism, which includes a vertical flow guiding channel (22), a first compression channel (23) and a second compression channel (24); The vertical flow channel (22), the first compression channel (23), and the second compression channel (24) are all connected. The vertical flow channel (22) is connected to the internal space of the electrode (3), and the second compression channel (24) is connected to the external space of the nozzle body (2). The vertical flow channel (22) is provided with several circumferentially distributed diversion mechanisms, including a horizontal diversion channel (25), a third compression channel (26), and a converging channel (27); The horizontal diversion channel (25), the third compression channel (26), and the converging channel (27) are all connected. The horizontal diversion channel (25) is connected to the vertical guide channel (22), and the converging channel (27) is connected to the second compression channel (24).

10. The nozzle structure of the plasma cutting gun according to claim 1 or 9, characterized in that, The nozzle body (2) is provided with a baffle (28) at the bottom, and the baffle (28) has a number of flow-diverting holes (29) that penetrate itself and are distributed in a circle.

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