CN212390362U - Powder metallurgy cutting nozzle for machine cutting torch - Google Patents

Abstract

The utility model discloses a powder metallurgy cutting torch for a machine cutting torch, which comprises a cutting torch outer sleeve, wherein the rear end of the cutting torch outer sleeve is provided with a cutting torch main body, and the front end of the cutting torch main body is provided with a cutting torch core rod; the cutting torch core rod is fixed on the cutting torch main body in a matching way through a conical surface, the rear end of the cutting torch main body is provided with a conical installation body which is installed in a matching way with the cutting torch installation seat, the conical surface of the conical installation body is provided with an installation sealing structure, and the conical installation body is also provided with an air inlet premixing structure communicated with the preheated air mixing chamber; the utility model has the advantages that the impact and abrasion of the conical mounting body to the cutting torch mounting seat can be effectively buffered while the good sealing effect is ensured by additionally arranging the mounting sealing structure, the deformation of the cutting torch mounting seat is effectively reduced, and the service life of the cutting torch mounting seat is prolonged; in addition, the multi-stage mixing of the mixed gas is realized by the combined use of the gas inlet premixing structure, the preheated gas mixing chamber and the cyclone device, so that the mixed gas is more fully and uniformly mixed, and the preheating effect of the mixed gas is improved.

Description

Powder metallurgy cutting nozzle for machine cutting torch

Technical Field

The utility model relates to a cutting torch technical field especially relates to a powder metallurgy cutting torch for machine cutting torch.

Background

The gas cutting is performed by: a preheating flame formed by combustion of a preheating gas mixed by fuel gas and oxygen gas is injected from a gas cutting nozzle to preheat an object to be cut such as a steel sheet, and cutting oxygen is injected to the object to be cut which is sufficiently preheated to burn a base material, and a molten base material and an oxidation product are removed by injection energy. Then, the gas cutting torch is driven in the target direction while continuing the gas cutting, whereby the workpiece can be cut into a target shape.

The fuel gas for gas cutting comprises acetylene gas, liquefied petroleum gas, natural gas, ethylene gas, hydrogen gas and the like, each fuel gas is provided with a special cutting nozzle, and the cutting nozzle is an important part of the cutting torch and has a great influence on the performance of the whole cutting torch.

FIG. 5 shows a cutting torch structure for a machine, which comprises a cutting torch outer sleeve, a cutting torch core bar and a cutting torch main body, wherein the cutting torch core bar is connected with the cutting torch main body in a threaded fit manner, and the cutting torch main body and the cutting torch outer sleeve are of a split structure and are installed in an insertion manner; in addition, the whole cutting nozzle in the prior art is machined by using a numerical control machine tool through a whole red copper bar, so that the machining processes are more, the machining difficulty is high, the utilization rate of raw materials is lower, the cost is higher, particularly, when a plurality of gas channels are machined, the shape of a hole is difficult to control, the defective rate of workpieces is higher, and the production cost is further increased; in addition, the red copper material is soft, the mechanical strength is poor, and particularly, the red copper material and the conical surface of the cutting torch mounting seat are easy to deform, so that the service life of the cutting torch is short; in order to solve the problem in the prior art, the mechanical strength is improved by plating chromium on the surface of the cutting nozzle outer sleeve, and although the strength and the hardness are improved, the cost is higher due to the complex operation and the market competitiveness is not provided, so that the large-scale popularization and use are difficult; in addition, the back is accomplished in the installation of cutting torch main part, and the cooperation forms the air chamber between the conical surface of cutting torch mount pad, in order to improve the leakproofness of air chamber, need tightly extrude the conical surface of cutting torch main part in the conical surface with the cutting torch mount pad during the installation, because the material of cutting torch also generally chooses copper for use, can be compelled to take place to warp on the conical surface of cutting torch mount pad, and dismantle the change back many times, the conical surface deflection of cutting torch mount pad is great, can't carry out interference fit with the conical surface of cutting torch main part again and realize good sealed effect, lead to gas leakage, usability and security all hardly obtain the assurance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a powder metallurgy cutting torch for machine cutting torch is provided that processing is convenient, with low costs, installation leakproofness is better and can not cause destruction to the conical surface of cutting torch mount pad.

In order to solve the technical problem, the technical scheme of the utility model is that: the powder metallurgy cutting torch for the machine cutting torch comprises a cutting torch outer sleeve, wherein a cutting torch main body is installed at the rear end of the cutting torch outer sleeve, and a cutting torch core rod is installed at the front end of the cutting torch main body; an oxygen inlet channel penetrates through the center of the cutting torch main body, an oxygen outlet channel communicated with the oxygen inlet channel is arranged in the center of the cutting torch core rod, a preheated gas mixing chamber is arranged between the cutting torch core rod and the cutting torch outer sleeve, and a preheated gas outlet channel communicated with the preheated gas mixing chamber is arranged between the front end of the cutting torch core rod and the front end of the cutting torch outer sleeve; the cutting torch comprises a cutting torch main body, a cutting torch core rod, a cutting torch mounting seat, a cutting torch.

As a preferable technical solution, the conical mounting body includes a first sealing cone, a second sealing cone and a third sealing cone which are sequentially arranged from top to bottom and located on the same conical surface.

As a preferred technical scheme, the mounting and sealing structure comprises sealing ring grooves which are respectively and correspondingly arranged on the peripheral conical surfaces of the first sealing cone, the second sealing cone and the third sealing cone, and a mounting seat sealing ring is correspondingly mounted in each sealing ring groove.

As a preferable technical scheme, the air inlet premixing structure comprises a preheated air inlet chamber arranged between the first sealing cone and the second sealing cone and a preheated air premixing chamber arranged between the second sealing cone and the third sealing cone, a plurality of first preheated air channels for communicating the preheated air inlet chamber with the preheated air premixing chamber are uniformly distributed on the second sealing cone in a penetrating manner, and a plurality of second preheated air channels for communicating the preheated air premixing chamber with the preheated air mixing chamber are uniformly distributed on the third sealing cone in a penetrating manner.

As a preferred technical scheme, each first preheating gas channel and each second preheating gas channel correspond to each other one by one to form a plurality of groups of preheating gas channels, and the axes of the corresponding first preheating gas channels and the corresponding second preheating gas channels in the same group of preheating gas channels are superposed and vertically arranged; the aperture of the second preheating gas channel is larger than that of the first preheating gas channel.

According to the preferable technical scheme, the preheating gas premixing chambers are internally provided with mutually separated preheating gas negative pressure cavities, each preheating gas negative pressure cavity corresponds to each group of the first preheating gas channel, and the first preheating gas channel and the second preheating gas channel in the same group are communicated with the corresponding preheating gas negative pressure cavities.

As a preferable technical scheme, the rear part of the cutting nozzle core rod is integrally provided with a rotational flow device positioned in the preheating gas mixing chamber.

According to the preferable technical scheme, the cyclone device is a cyclone, the cyclone is a cylindrical cyclone body in clearance fit with the cutting nozzle outer sleeve, and a plurality of spiral cyclone air channels are uniformly arranged at the periphery of the cylindrical cyclone body.

As a preferred technical scheme, the rear end of the cutting nozzle core rod is provided with an outer conical surface, the center of the front end of the cutting nozzle main body is provided with an inner conical hole which is matched and installed with the outer conical surface, and the outer conical surface is matched and fastened in the inner conical hole; the cutting torch core rod is welded and fixed with the outer end of the matching surface of the cutting torch main body.

As a preferable technical scheme, the cutting torch outer sleeve, the cutting torch core rod and the cutting torch main body are respectively of an integrally formed powder metallurgy structure.

Due to the adoption of the technical scheme, the powder metallurgy cutting torch for the machine cutting torch comprises a cutting torch outer sleeve, wherein a cutting torch main body is arranged at the rear end of the cutting torch outer sleeve, and a cutting torch core rod is arranged at the front end of the cutting torch main body; an oxygen inlet channel penetrates through the center of the cutting torch main body, an oxygen outlet channel communicated with the oxygen inlet channel is arranged in the center of the cutting torch core rod, a preheated gas mixing chamber is arranged between the cutting torch core rod and the cutting torch outer sleeve, and a preheated gas outlet channel communicated with the preheated gas mixing chamber is arranged between the front end of the cutting torch core rod and the front end of the cutting torch outer sleeve; the cutting torch core rod is fixed on the cutting torch main body in a matched manner through a conical surface, a conical installation body which is installed in a matched manner with the cutting torch installation seat is arranged at the rear end of the cutting torch main body, an installation sealing structure is arranged on the conical surface of the conical installation body, and an air inlet premixing structure communicated with the preheated air mixing chamber is further arranged on the conical installation body; the utility model has the advantages that:

(1) in the prior art, the conical surface of the cutting torch body is tightly extruded on the cutting torch mounting seat to realize the mounting sealing property between the cutting torch mounting seat and the cutting torch mounting seat, but the cutting torch mounting seat is forced to deform due to the sealing mode because the cutting torch is made of copper, and after the cutting torch is disassembled and replaced for many times, the deformation of the cutting torch mounting seat is increased, so that the cutting torch mounting seat can not be in interference fit with the conical surface of the cutting torch body to realize a good sealing effect, gas leakage can be caused, and even a safety problem can be caused; in order to solve the problem, the mounting sealing structure is additionally arranged on the conical surface of the conical mounting body, so that during mounting, the conical mounting body is not required to be extruded on the cutting torch mounting seat in an interference manner, a good sealing effect can be realized, the impact and the abrasion of the conical mounting body on the cutting torch mounting seat can be effectively buffered while the good sealing effect is ensured, the deformation of the cutting torch mounting seat is effectively reduced, and the service life of the cutting torch mounting seat is prolonged;

(2) the utility model has the advantages that the air flow is firstly preliminarily mixed in the preheating air premixing chamber and then enters the preheating air mixing chamber for next step mixing, and simultaneously, because the swirling device is additionally arranged in the preheating air mixing chamber, the air flow still has a forced mixing process in the preheating air mixing chamber, the mixing of the utility model mainly comprises three processes, compared with the prior art which only has one-step mixing, the mixing effect of the utility model is obviously better, especially, the swirling device does not exist in the prior art, so when the fuel gas is mixed with the oxygen, the mixing is generated after the two air flow motion processes meet, the mixing process and the mixing effect have instability, and in the utility model, because the swirling device has a forced mixing process, the mixing effect is obviously ensured.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an embodiment of the present invention;

FIG. 3 is a schematic structural view of a cutting torch core bar and a cutting torch main body according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a core bar of a cutting torch according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a background art structure;

in the figure: 1-cutting nozzle jacket; 2-cutting nozzle main body; 21-a first sealing cone; 22-a second sealing cone; 23-a third sealing cone; 3-cutting nozzle core bar; 31-outer conical surface; 32-a swirling device; 33-a cyclone air duct; 4-an oxygen intake passage; 5-oxygen outlet channel; 6-preheating a gas mixing chamber; 7-preheating gas outlet channel; 8, installing a sealing structure; 81-sealing ring groove; 82-mounting seat sealing ring; 9-an air intake premixing structure; 91-preheating gas inlet chamber; 92-preheat gas premix chamber; 93-a first pre-heating gas channel; 94-second pre-heating gas channel; 95-preheating the air negative pressure chamber.

Detailed Description

The invention is further explained below with reference to the drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention have been described by way of illustration only. Needless to say, a person skilled in the art will recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

As shown in fig. 1 to 4, the powder metallurgy cutting torch for the machine cutting torch comprises a cutting torch outer sleeve 1, a cutting torch main body 2 is arranged at the rear end of the cutting torch outer sleeve 1, and a cutting torch core rod 3 is arranged at the front end of the cutting torch main body 2; an oxygen inlet channel 4 penetrates through the center of the cutting torch main body 2, an oxygen outlet channel 5 communicated with the oxygen inlet channel 4 is arranged in the center of the cutting torch core rod 3, oxygen enters through the oxygen inlet channel 4 and then is discharged from the oxygen outlet channel 5, and the oxygen cutting effect is realized; referring to fig. 2, the oxygen inlet channel 4 is a cylindrical inlet channel, the oxygen outlet channel 5 is formed by a large-diameter cylindrical channel through conical surface transition from back to front, the diameter of the large-diameter cylindrical channel is the same as that of the cylindrical inlet channel, when oxygen enters the small-diameter cylindrical channel through the large-diameter cylindrical channel, the diameter of the oxygen is suddenly reduced, so that the flow velocity of the oxygen is suddenly increased, and a quick air outlet effect can be realized; a preheating gas mixing chamber 6 is arranged between the cutting nozzle core rod 3 and the cutting nozzle outer sleeve 1, the preheating gas mixing chamber 6 is of an annular structure, the preheating gas mixing chamber 6 is formed by a large-diameter circular ring channel through conical surface transition from back to front, and when mixed gas enters the small-diameter circular ring channel from the large-diameter circular ring channel, the diameter is suddenly reduced, so that the flow velocity of the mixed gas is suddenly increased, and the quick gas outlet effect can be realized; a preheated gas outlet channel 7 communicated with a preheated gas mixing chamber 6 is arranged between the front end of the cutting torch core rod 3 and the front end of the cutting torch outer sleeve 1; in this embodiment, the front end of the cutting torch core rod 3 is provided with a plurality of preheating gas guide grooves in an annular array, which form a quincunx structure the same as the prior art and are mainly used for liquefied petroleum gas, natural gas and ethylene gas, and the plurality of preheating gas guide grooves are combined to form a preheating gas outlet passage 7.

In the embodiment, the cutting torch core rod 3 is fixed on the cutting torch main body 2 through conical surface matching, and has better centering property and sealing property through adopting a conical surface matching mode, the centering property can ensure the matching coaxiality between the cutting torch core rod 3 and the cutting torch main body 2, so that a good positioning effect is realized, and the sealing property can ensure that high-requirement cutting oxygen cannot enter the preheating gas mixing chamber 6 to influence the premixing effect; in addition, the connection is not carried out through threads as in the prior art, the matching installation mode is simpler, and the quick installation effect can be realized.

Further, referring to fig. 2 and 4, an outer conical surface 31 is arranged at the rear end of the cutting torch core rod 3, an inner conical hole which is installed in a matched manner with the outer conical surface 31 is arranged at the center of the front end of the cutting torch main body 2, a positioning shoulder which corresponds to the rear end of the cutting torch core rod 3 is further arranged at the rear end of the inner conical hole, and the outer conical surface 31 is fastened in the inner conical hole in a matched manner; in conical matching, the outer conical surface 31 and the inner conical hole can be automatically centered under the action of axial force, so that the axes of the inner cone and the outer cone have higher coaxiality and can be quickly installed; the inner and outer cone surfaces are matched and ground to have better self-locking performance and sealing performance. In this embodiment, the external conical surface 31 and the internal conical hole are in interference fit, so that the external conical surface 31 has better centering performance and sealing performance, and when the cutting torch is installed, the external conical surface 31 of the cutting torch core rod 3 is fixed in the internal conical hole in an extruding manner instead of a thread fit manner in the prior art, although a certain coaxiality can be ensured by the thread fit manner, the centering effect is poorer than that of the utility model, and the stability and the sealing performance of connection between the external conical surface 31 and the internal conical hole cannot be accurately ensured; meanwhile, the thread machining is needed, the machining process is complex, the requirement on the thread machining precision is high, the efficiency is low, the cost is high, and the batch production of products is not facilitated.

In order to ensure the installation and use effects of the cutting torch, the cutting torch core rod 3 and the cutting torch main body 2 are installed in a matched mode when the cutting torch is delivered, and the problem that the cutting effect of the cutting torch is influenced because the installation precision cannot be ensured when a user installs the cutting torch by himself is avoided, so that the cutting torch core rod 3 is tightly fixed on the cutting torch main body 2 in an extrusion interference fit mode before delivery; however, in order to avoid the phenomenon that the cutting torch core rod 3 is separated from the cutting torch main body 2 due to bumping or collision in the transportation process, the outer ends of the matching surfaces of the cutting torch core rod 3 and the cutting torch main body 2 are welded and fixed, namely, a layer of installation guarantee is further added on the basis of fastening installation. The welding fixing mode can be spot welding or seam welding, and seam welding is adopted in the embodiment, so that stable installation can be realized, and meanwhile, the sealing effect of the connecting part can be further ensured.

Referring to fig. 2 and 3, a conical mounting body which is mounted in a matching manner with the cutting torch mounting seat is arranged at the rear end of the cutting torch main body 2, a mounting sealing structure 8 is arranged on the conical surface of the conical mounting body, and an air inlet premixing structure 9 communicated with the preheated air mixing chamber 6 is further arranged on the conical mounting body. Fuel gas and oxygen enter into respectively in the premixed structure 9 of admitting air, carry out preliminary mixing and form the gas mixture, then reentry to carry out further complete mixing in preheating gas mixing chamber 6, after the misce bene then by preheating gas outlet channel 7 discharges the burning, preheats the cutting piece. In the prior art, the conical surface of the cutting torch main body 2 is tightly extruded on the cutting torch mounting seat to realize the mounting sealing property between the cutting torch mounting seat and the cutting torch mounting seat, but the cutting torch mounting seat is forced to deform due to the sealing mode because the cutting torch is made of copper, and after the cutting torch is disassembled and replaced for many times, the deformation of the cutting torch mounting seat is increased, so that the cutting torch mounting seat can not be in interference fit with the conical surface of the cutting torch main body 2 to realize a good sealing effect, gas leakage can be caused, and even a safety problem can be caused; and the utility model discloses a solve this problem add on the conical surface of toper installation body installation seal structure 8, during the installation, no longer need with toper installation body interference extrusion can realize good sealed effect on the cutting torch mount pad, can realize guaranteeing that good sealed effect can also effectively cushion the toper installation body is to the impact and the wearing and tearing of cutting torch mount pad, effectively reduces the deflection of cutting torch mount pad, prolongs the life of cutting torch mount pad.

Referring to fig. 2 and 3, the conical mounting body includes a first sealing cone 21, a second sealing cone 22 and a third sealing cone 23 which are sequentially arranged from top to bottom and located on the same conical surface, and the first sealing cone 21, the second sealing cone 22 and the third sealing cone 23 are gradually enlarged from top to bottom to form a conical surface structure matched with the cutting torch mounting seat.

Referring to fig. 2 and 3, the mounting and sealing structure 8 includes sealing ring grooves 81 respectively and correspondingly disposed on the outer peripheral conical surfaces of the first sealing cone 21, the second sealing cone 22 and the third sealing cone 23, a mounting seat sealing ring 82 is correspondingly mounted in each sealing ring groove 81, and the three mounting seat sealing rings 82 together form the mounting and sealing structure 8. In this embodiment, sealing washer annular 81 is the arc annular, mount pad sealing washer 82 is O type rubber seal, O type rubber seal compresses tightly in the arc annular, O type rubber seal's outside surpasss the sealed cone surface that corresponds and is used for sealing up the cooperation with the cutting torch mount pad. After the cutting torch core rod 3, the cutting torch main body 2 and the cutting torch outer sleeve 1 are installed in a matched mode, when the cutting torch core rod is required to be installed in a cutting torch installation seat of a cutting torch, firstly, the installation seat sealing rings 82 are correspondingly installed in the sealing ring annular groove 81, then, the cutting torch main body 2 is pushed towards the interior of the cutting torch installation seat, the sealing ring annular groove 81 is tightly pressed on the cutting torch installation seat in a sealing mode, and then the cutting torch is integrally fixed through the matching of a cutting torch screw cap; in the utility model, the conical surface of the conical mounting body is not required to be tightly extruded on the cutting torch mounting seat as in the prior art, but the sealing effect between the conical mounting body and the cutting torch mounting seat is ensured through the mounting seat sealing ring 82, so that unsafe phenomena such as air leakage and the like are avoided; simultaneously because mount pad sealing washer 82 pressure equipment is in between the external conical surface 31 of toper installation body and the cutting torch mount pad, consequently the cooperation relation between the external conical surface 31 of toper installation body and the cutting torch mount pad can be transition fit or clearance fit, no longer like interference fit among the prior art, at this moment mount pad sealing washer 82 can also effectively cushion the toper installation body with the impact of fitting surface between the cutting torch mount pad avoids making the cutting torch mount pad take place great deformation, can not lead to the fact wearing and tearing to the cutting torch mount pad, has prolonged the life of cutting torch.

Referring to fig. 2 and 3, the intake premixing structure 9 includes a preheated air inlet chamber 91 disposed between the first sealing cone 21 and the second sealing cone 22, and a preheated air premixing chamber 92 disposed between the second sealing cone 22 and the third sealing cone 23, a plurality of first preheated air passages 93 communicating the preheated air inlet chamber 91 with the preheated air premixing chamber 92 are uniformly distributed on the second sealing cone 22, and a plurality of second preheated air passages 94 communicating the preheated air premixing chamber 92 with the preheated air mixing chamber 6 are uniformly distributed on the third sealing cone 23. In this embodiment, the preheated gas inlet chamber 91 and the preheated gas premixing chamber 92 are annular gas chambers formed by matching with the cutting torch mounting seat; six first preheating gas passages 93 and six second preheating gas passages 94 are arranged, and the first preheating gas passages 93 and the second preheating gas passages 94 are cylindrical holes.

The first sealing cone 21 is matched with the two mounting seat sealing rings 82 on the second sealing cone 22 to ensure the sealing effect in the preheated gas inlet chamber 91, and the second sealing cone 22 is matched with the two mounting seat sealing rings 82 on the third sealing cone 23 to ensure the sealing effect in the preheated gas premixing chamber 92, so that the preheated gas inlet chamber 91 and the preheated gas premixing chamber 92 are independently separated; in this embodiment, oxygen enters the pre-heating gas inlet chamber 91, and fuel gas enters the pre-heating gas premixing chamber 92. After entering the preheated gas inlet chamber 91, the oxygen moves forward through the first preheated gas passage 93 to the preheated gas premixing chamber 92, is primarily mixed with the fuel gas in the preheated gas premixing chamber 92, then continues to move forward through the second preheated gas passage 94, and moves into the preheated gas mixing chamber 6 to be mixed next.

Referring to fig. 2, each of the first preheating gas passages 93 and each of the second preheating gas passages 94 correspond to one another to form a plurality of groups of preheating gas passages, the axes of the corresponding first preheating gas passages 93 and the corresponding second preheating gas passages 94 in the same group of preheating gas passages are overlapped and vertically arranged, and because the first preheating gas passages 93 and the second preheating gas passages 94 correspond to each other vertically, when oxygen moves from the first preheating gas passages 93 to the preheating gas premixing chamber 92, the oxygen is primarily mixed with the fuel gas in the preheating gas premixing chamber 92; however, because the gas movement has inertia and the oxygen gas has a certain pressure injection, a part of the gas still continues to enter the second preheating gas channel 94 directly along the original movement path, so that the communication part of the preheating gas premixing chamber 92 and the second preheating gas channel 94 loses pressure instantaneously, the gas amount increases instantaneously and generates vortex, under the action of negative pressure, the mixed gas in the preheating gas premixing chamber 92 is sucked into the second preheating gas channel 94, mixing continues and moves forward along the second preheating gas channel 94 to the preheating gas mixing chamber 6, due to the fact that the first preheating gas channel 93 and the second preheating gas channel 94 are in positive correspondence, the movement speed of the gas flow cannot be reduced, a negative pressure area is formed in the preheating gas premixing chamber 92, mixing of the gas flow is promoted, and the gas flow rate in the preheating gas premixing chamber 92 is also increased, so that the gas quickly enters into the second preheating gas channel 94.

Since the amount of gas entering the second preheating gas channel 94 is large, in order to avoid large resistance, the aperture of the second preheating gas channel 94 is larger than that of the first preheating gas channel 93, so as to meet the usage amount of the mixed gas.

Because every group preheat the gas passage and all can be in it produces a negative pressure area to correspond in advance the gas mixes the indoor mutual interference in advance, in order to prevent the gas between each negative pressure area, consequently the utility model discloses preheat and arrange the gas negative pressure chamber 95 that preheats that separates each other in the gas mixes the indoor 92, each preheat gas negative pressure chamber 95 and each group first preheat gas passage 93 one and correspond, same a set of first preheat gas passage 93 with the second preheat gas passage 94 all with corresponding preheat gas negative pressure chamber 95 intercommunication, each preheat gas negative pressure chamber 95 still all with preheat gas and mix room 92 intercommunication in advance, see figure 2. Each preheating gas negative pressure cavity 95 is separated, that is, each negative pressure area is divided into separate preheating gas negative pressure cavities 95, so that the negative pressure generated in each preheating gas negative pressure cavity 95 can be fully utilized, and further, the mixed gas in the corresponding preheating gas negative pressure cavity 95 can enter the corresponding second preheating gas channel 94 more quickly, and the gas flow movement is ensured not to interfere with each other; meanwhile, the oxygen moving from the first preheating gas channel 93 to the preheating gas premixing chamber is mainly gathered in the corresponding preheating gas negative pressure cavity 95, is fully mixed with the fuel gas in the preheating gas negative pressure cavity 95, and then enters the second preheating gas channel 94; the utility model discloses a divide each independent preheating gas negative pressure chamber 95, each regional produced negative pressure of make full use of realizes the intensive mixing of air current and the rapid movement of air current.

The preheated air negative pressure cavity 95 is a triangular groove-shaped air chamber, and is formed by a mold, so that demolding of the mold is facilitated.

Referring to fig. 2 and 4, the rear part of the cutting nozzle core rod 3 is integrally provided with a swirling device 32 positioned in the preheated gas mixing chamber 6. The swirling device 32 is arranged in the preheated gas mixing chamber 6, and the distance between the rear end of the swirling device 32 and the front end of the cutting nozzle main body is 3-8mm, namely, the swirling device is close to the rear part of the preheated gas mixing chamber 6. When the airflow comes out from the second preheating gas channel 94 and needs to move for a short stroke and then passes through the rotational flow device 32, the airflow makes a swirling motion after passing through the rotational flow device 32, the combustion gas and the oxygen are involved in the moving process, the swirling mixing is performed along the rotational flow device 32, meanwhile, the moving path of the airflow is increased, so that the mixed gas is more fully and uniformly mixed, the airflow coming out from the rotational flow device 32 continues to enter the preheating gas mixing chamber 6, at the moment, the airflow is not influenced by the rotational flow device 32 and is not forced to perform the swirling motion, and therefore, when the airflow continues to move along the preheating gas mixing chamber 6, the airflow gradually becomes stable, the moving direction stably faces the preheating gas outlet channel 7, and then the preheating gas outlet channel 7 sprays out, so that the stability of the preheating flame can be effectively improved, meanwhile, the preheating speed can be effectively improved due to the fact that the air lines of the ejected air flow are long; in addition, the air flow is still further mixed in the preheating air mixing chamber 6, and the mixing effect is better.

In this embodiment, the air flow is firstly primarily mixed in the preheating air premixing chamber 92, and then enters the preheating air mixing chamber 6 for further mixing, and meanwhile, because the swirling device 32 is additionally arranged in the preheating air mixing chamber 6, the air flow still has a forced mixing process in the preheating air mixing chamber 6, so that the mixing of the present invention mainly comprises three processes, compared with the prior art which only has one-time mixing, the mixing effect of the present invention is significantly better, especially the swirling device 32, the swirling device 32 does not exist in the prior art, when the fuel gas and the oxygen are mixed, the mixing is generated after the two air flow motion processes meet, the mixing process and the mixing effect have instability, and in the present invention, because the setting of the swirling device 32 has a forced mixing process, the mixing effect is obviously ensured.

In the prior art, a rotational flow device 32 in a threaded connection mode exists, the rotational flow device 32 and the cutting nozzle core rod 3 are required to be subjected to thread machining, the machining process is complex, the cost is high, the rotational flow device 32 can be loosened through threaded connection, the rotational flow device 32 can rotate unstably under the air flow movement, and the air flow movement speed is influenced; and the utility model provides a swirl device 32 with be integrated into one piece's structure between the cutting torch core bar 3, processing is convenient, with low costs, just swirl device 32 with fixed position between the cutting torch core bar 3 need not the installation, and does not exist because the uncertain phenomenon that causes the air velocity inconsistent in swirl device 32 position.

Referring to fig. 2 and 4, the swirling device 32 is a swirler, the swirler is a cylindrical swirling body in clearance fit with the cutting torch outer sleeve 1, a clearance value of the swirler is small, a plurality of spiral swirling air channels 33 are uniformly arranged on the periphery of the cylindrical swirling body, firstly, a clearance between the periphery of the swirler and the inner wall of the cutting torch outer sleeve 1 is small, so that gas passing through the swirler can enter the swirling air channels 33 and carries out swirling motion through the swirling air channels 33, and all gas is ensured to be subjected to a forced mixing process; the swirl air duct 33 realizes a swirling motion of the air flow on the one hand and increases a motion path of the air flow on the other hand, and the swirling motion and the motion path are combined to improve a mixing effect of the air.

In the prior art, the cutting torch is mainly made of red copper and is machined by a numerical control machine, the cutting torch is insufficient in hardness and poor in wear resistance due to the fact that the copper material is soft, and in order to solve the problem, chromium is plated on the surface of the cutting torch outer sleeve 1 to improve the hardness, so that the cost is high and the operation is complex; therefore, the cutting torch outer sleeve 1, the cutting torch core rod 3 and the cutting torch main body 2 are respectively of an integrally formed powder metallurgy structure. The cutting torch outer sleeve 1, the cutting torch core rod 3 and the cutting torch main body 2 are respectively processed and manufactured by adopting a powder metallurgy process, and the processing specific steps comprise:

(1) selecting metal powder meeting the requirements, selecting a binder according to the type of the metal powder, mixing the metal powder and the binder, and granulating to prepare a raw material suitable for injection molding, wherein in the embodiment, the metal powder is stainless steel powder;

(2) manufacturing a mould for injection moulding according to the sizes and the structures of the cutting torch outer sleeve 1, the cutting torch main body 2 and the cutting torch core rod 3, and injecting raw materials into the mould by using an injection moulding machine for moulding;

(3) removing the binder in the product formed by the die by a chemical method or a heating decomposition method;

(4) sintering and densifying the product subjected to binder removal at high temperature to obtain a sintered product;

(5) carrying out post-treatment on the sintered product as required to obtain a final finished product;

each part is formed in one step through a die, additional machining holes and the like are not needed, the machining mode is more convenient, the cost is lower, the production efficiency is high, and mass production can be realized; the consistency of the produced components is better, the interchangeability of the components is higher in the assembly process of the cutting nozzle, the connection mode does not need to be matched by processing threads after being respectively processed as in the prior art, and the quick installation can be realized; furthermore, the utility model discloses the cutting torch that forms is the stainless steel cutting torch, and hardness and the wearability of its structure etc. are all better, non-deformable, long service life.

Of course, the inlet chamber 91 for preheated gas may be filled with fuel gas, while the inlet chamber 92 for preheated gas is filled with oxygen gas.

The basic principles, main features and advantages of the present invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. The powder metallurgy cutting torch for the machine cutting torch comprises a cutting torch outer sleeve, wherein a cutting torch main body is installed at the rear end of the cutting torch outer sleeve, and a cutting torch core rod is installed at the front end of the cutting torch main body; an oxygen inlet channel penetrates through the center of the cutting torch main body, an oxygen outlet channel communicated with the oxygen inlet channel is arranged in the center of the cutting torch core rod, a preheated gas mixing chamber is arranged between the cutting torch core rod and the cutting torch outer sleeve, and a preheated gas outlet channel communicated with the preheated gas mixing chamber is arranged between the front end of the cutting torch core rod and the front end of the cutting torch outer sleeve; the method is characterized in that: the cutting torch comprises a cutting torch main body, a cutting torch core rod, a cutting torch mounting seat, a cutting torch.

2. A powder metallurgy cutting tip for a machine torch as set forth in claim 1, wherein: the conical mounting body comprises a first sealing cone, a second sealing cone and a third sealing cone which are sequentially arranged from top to bottom and are positioned on the same conical surface.

3. A powder metallurgy cutting tip for a machine torch as set forth in claim 2, wherein: the mounting and sealing structure comprises sealing ring grooves which are respectively and correspondingly arranged on the peripheral conical surfaces of the first sealing cone, the second sealing cone and the third sealing cone, and a mounting seat sealing ring is correspondingly mounted in each sealing ring groove.

4. A powder metallurgy cutting tip for a machine torch as set forth in claim 2, wherein: the air inlet premixing structure comprises a preheating air inlet chamber arranged between the first sealing cone and the second sealing cone and a preheating air premixing chamber arranged between the second sealing cone and the third sealing cone, a plurality of first preheating air channels communicated with the preheating air inlet chamber and the preheating air premixing chamber are uniformly distributed on the second sealing cone in a penetrating manner, and a plurality of second preheating air channels communicated with the preheating air premixing chamber and the preheating air mixing chamber are uniformly distributed on the third sealing cone in a penetrating manner.

5. A powder metallurgy cutting tip for a machine torch as set forth in claim 4, wherein: the first preheating gas channels and the second preheating gas channels correspond to each other one by one to form a plurality of groups of preheating gas channels, and the axes of the corresponding first preheating gas channels and the second preheating gas channels in the same group of preheating gas channels are superposed and vertically arranged; the aperture of the second preheating gas channel is larger than that of the first preheating gas channel.

6. A powder metallurgy cutting tip for a machine torch as set forth in claim 5, wherein: the preheating gas premixing chamber is internally provided with mutually separated preheating gas negative pressure cavities, each preheating gas negative pressure cavity corresponds to each group of the first preheating gas channel, and the first preheating gas channel and the second preheating gas channel in the same group are communicated with the corresponding preheating gas negative pressure cavities.

7. A powder metallurgy cutting tip for a machine torch as set forth in claim 1, wherein: and the rear part of the cutting nozzle core rod is integrally provided with a rotational flow device positioned in the preheating gas mixing chamber.

8. A powder metallurgy cutting tip for a machine torch as set forth in claim 7, wherein: the cyclone device is a cyclone, the cyclone is a columnar cyclone body in clearance fit with the cutting nozzle outer sleeve, and a plurality of spiral cyclone air channels are uniformly arranged at the periphery of the columnar cyclone body.

9. A powder metallurgy cutting tip for a machine torch as set forth in claim 1, wherein: the rear end of the cutting nozzle core rod is provided with an outer conical surface, the center of the front end of the cutting nozzle main body is provided with an inner conical hole which is matched and installed with the outer conical surface, and the outer conical surface is matched and fastened in the inner conical hole; the cutting torch core rod is welded and fixed with the outer end of the matching surface of the cutting torch main body.

10. A powder metallurgy cutting tip for a machine cutting torch according to any one of claims 1 to 9, wherein: the cutting torch outer sleeve, the cutting torch core rod and the cutting torch main body are of an integrally formed powder metallurgy structure respectively.

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