CN111765464A - Powder metallurgy cutting nozzle for acetylene cutting torch - Google Patents

Abstract

The invention discloses a powder metallurgy cutting torch for an acetylene cutting torch, which comprises a cutting torch outer sleeve, wherein a cutting torch core rod is arranged in the cutting torch outer sleeve, a cutting torch rod seat is arranged at the rear part of the cutting torch core rod, the cutting torch rod seat is arranged at the rear end of the cutting torch outer sleeve in a conical surface fit manner, a cutting torch core head is arranged at the front end of the cutting torch core rod, the cutting torch core head is coaxially fixed at the front end of the cutting torch outer sleeve, and the cutting torch core rod, the cutting torch rod seat and the cutting torch core head are integrally formed to form a cutting torch core sleeve; the invention has simple structure and reasonable design, is convenient to process by adopting an integrally formed structure, and is more convenient to install by conical surface matching; in addition, the coaxiality of the front end and the rear end of the cutting nozzle core rod can be ensured, the air outlet is ensured to be smoother, the air outlet speed is improved, and the cutting quality is ensured; meanwhile, the powder metallurgy process is adopted for forming design, the cutting torch has the advantages of low processing cost, long service life of the cutting torch and the like, the processing efficiency is obviously improved, and the batch production of products is facilitated.

Description

Powder metallurgy cutting nozzle for acetylene cutting torch

Technical Field

The invention relates to the technical field of acetylene cutting torches, in particular to a powder metallurgy cutting torch for the acetylene cutting torch.

Background

The gas cutting is performed by: a mixed gas obtained by mixing fuel gas and oxygen is injected from a gas cutting nozzle, a preheating flame obtained by combustion preheats a workpiece such as a steel plate, cutting oxygen is injected to the sufficiently preheated workpiece 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. The acetylene gas mainly adopts an annular cutting nozzle, and the liquefied petroleum gas or natural gas mainly adopts a plum blossom type cutting nozzle.

The conventional annular cutting torch generally comprises a cutting torch outer sleeve, a cutting torch core and a cutting torch seat, wherein the three parts are connected in a threaded fit manner, and fig. 10 shows an annular cutting torch commonly used in the prior art. After the cutting nozzle connected through the threads is expanded by high temperature, the threaded connection part is easy to deform and loosen, on one hand, the phenomenon of tempering caused by air leakage is caused, and on the other hand, the original airflow order is disturbed, so that the cutting quality is reduced; in addition, the cutting torch core among the prior art is only through threaded connection on the cutting torch seat to have annular gas outlet channel between cutting torch core and the cutting torch overcoat front end, so lead to the outer end of cutting torch core and formed the cantilever structure owing to do not have the location, long-time high temperature cutting back, the cutting torch core can produce certain deformation, lead to no longer coaxial between cutting torch core and the cutting torch overcoat, make gaseous annular gas outlet channel between cutting torch core and the cutting torch overcoat give vent to anger inhomogeneous, cause the cutting quality not good.

Disclosure of Invention

The technical problem to be solved by the invention is to provide the powder metallurgy cutting nozzle for the acetylene cutting torch, which has the advantages of simple structure, convenient processing, no gas leakage and higher coaxiality.

In order to solve the technical problems, the technical scheme of the invention is as follows: the powder metallurgy cutting torch for the acetylene cutting torch comprises a cutting torch outer sleeve, wherein a cutting torch core rod is installed in the cutting torch outer sleeve, a cutting torch rod seat is arranged at the rear end of the cutting torch core rod, an outer conical surface is arranged on the periphery of the cutting torch rod seat, an inner conical hole matched with the outer conical surface is formed in the rear end of the cutting torch outer sleeve, and a rod seat fixing structure is also arranged between the cutting torch rod seat and the cutting torch outer sleeve; the front end of the cutting torch core rod is provided with a cutting torch core head, and the cutting torch core rod, the cutting torch rod seat and the cutting torch core head are integrally formed to form a cutting torch core sleeve;

an oxygen channel penetrates through the center of the cutting nozzle core sleeve; a mixed gas channel is arranged between the cutting torch core rod and the cutting torch outer sleeve, a plurality of mixed gas inlets communicated with the mixed gas channel are arranged between the cutting torch rod seat and the cutting torch outer sleeve, the rear end of the cutting torch core head is coaxially fixed in the cutting torch outer sleeve, and a mixed gas annular gas outlet channel communicated with the mixed gas channel is arranged between the front end of the cutting torch core head and the cutting torch outer sleeve.

Preferably, the holder fixing structure includes a self-locking taper surface between the outer taper surface and the inner taper hole and/or a welding portion disposed between the cutting torch outer sleeve and the cutting torch holder.

According to the preferable technical scheme, a plurality of mixed gas inlet grooves are formed in the periphery of the cutting torch rod seat, and the mixed gas inlet grooves and the cutting torch outer sleeve are enclosed to form the mixed gas inlet.

As a preferred technical scheme, the mixed gas inlet grooves on two sides of the cutting torch rod seat are symmetrically arranged, the openings of the mixed gas inlet grooves on the same side face the same direction, and the openings of the mixed gas inlet grooves on two sides are opposite in direction; the mixed gas inlet groove is a groove convenient for outward demoulding.

As a preferred technical scheme, the rear end of the cutting torch core head is provided with a core head positioning section coaxially fixed in the cutting torch outer sleeve, the front end of the cutting torch core head is provided with a core head outlet section in clearance fit with the cutting torch outer sleeve, and the mixed gas annular gas outlet channel is arranged between the core head outlet section and the cutting torch outer sleeve.

As an optimized technical scheme, a plurality of mixed gas guide strips in an annular array are arranged on the periphery of the core head positioning section, a mixed gas guide groove is formed between every two adjacent mixed gas guide strips, and the mixed gas guide grooves enable the mixed gas annular gas outlet channel to be communicated with the mixed gas channel.

Preferably, the outer peripheries of all the mixed gas guide bars jointly form a core print positioning surface for fastening on the cutting nozzle outer sleeve.

As a preferred technical scheme, the peripheries of at least three uniformly arranged mixed gas guide bars jointly form a core head positioning surface for being fastened on the cutting nozzle outer sleeve, and the rest mixed gas guide bars are in clearance fit with the cutting nozzle outer sleeve.

As a preferred technical scheme, a positioning shoulder is correspondingly arranged on the matching surface of the outer conical surface and the inner conical hole.

According to the preferable technical scheme, the cutting nozzle outer sleeve is a powder metallurgy outer sleeve, and the cutting nozzle core sleeve is a powder metallurgy core sleeve.

By adopting the technical scheme, the powder metallurgy cutting torch for the acetylene cutting torch comprises a cutting torch outer sleeve, wherein a cutting torch core rod is installed in the cutting torch outer sleeve, a cutting torch rod seat is arranged at the rear end of the cutting torch core rod, an outer conical surface is arranged on the periphery of the cutting torch rod seat, an inner conical hole which is matched with the outer conical surface is formed in the rear end of the cutting torch outer sleeve, and a rod seat fixing structure is also arranged between the cutting torch rod seat and the cutting torch outer sleeve; the front end of the cutting torch core rod is provided with a cutting torch core head, and the cutting torch core rod, the cutting torch rod seat and the cutting torch core head are integrally formed to form a cutting torch core sleeve;

an oxygen channel penetrates through the center of the cutting nozzle core sleeve; a mixed gas channel is arranged between the cutting torch core rod and the cutting torch outer sleeve, a plurality of mixed gas inlets communicated with the mixed gas channel are arranged between the cutting torch rod seat and the cutting torch outer sleeve, the rear end of the cutting torch core head is coaxially fixed in the cutting torch outer sleeve, and a mixed gas annular gas outlet channel communicated with the mixed gas channel is arranged between the front end of the cutting torch core head and the cutting torch outer sleeve;

the invention has the beneficial effects that:

(1) the rear end of the cutting torch core sleeve is installed at the rear end of the cutting torch outer sleeve in a conical surface fit mode through the cutting torch rod seat, coaxiality between the cutting torch rod seat and the cutting torch outer sleeve is guaranteed, and the front end of the cutting torch core sleeve is coaxially fixed at the front end of the cutting torch outer sleeve through the cutting torch core head, so that coaxiality between the cutting torch core head and the cutting torch outer sleeve is guaranteed; the coaxiality of the front end and the rear end of the cutting torch core sleeve is guaranteed, particularly the coaxiality of the cutting torch core head is guaranteed, after the cutting torch core head is cut at high temperature for a long time, the cutting torch core head is heated and even deforms, the coaxiality of the cutting torch core head and the cutting torch outer sleeve can still be kept, the mixed gas is uniformly discharged from an annular gas outlet channel between the cutting torch core head and the cutting torch outer sleeve all the time, the gas is smoothly discharged, and the problems that the gas is not uniformly discharged due to the fact that different shafts are matched in threaded connection in the traditional design and the like are effectively avoided;

(2) the cutting torch rod seat is arranged on the cutting torch outer sleeve through the rod seat fixing structure, a torch rod is not connected on the outer sleeve through threads as in the prior art, the matching installation mode is simple, the quick installation effect can be realized, the connection stability between the cutting torch rod seat and the cutting torch outer sleeve can be ensured, and the problem that the use safety is influenced by connection falling off and the like is avoided;

(3) the cutting torch core rod, the cutting torch rod seat and the cutting torch core head are integrally formed to form the cutting torch core sleeve, the torch core is not connected to the core rod through threads as in the prior art, the integrally formed structure of the device is formed at one time through a die, the processing mode is more convenient, the cost is lower, and mass production can be realized; in addition, threads do not need to be machined for matching after respective machining as in the prior art, so that the interchangeability between the cutting nozzle core sleeve and the cutting nozzle outer sleeve of the device is high, and the matching degree is good; when oxygen passes through the oxygen channel, a connecting seam generated by thread matching does not exist, airflow resistance is small, smoothness and stability of oxygen flowing can be effectively guaranteed, gas is discharged quickly and stably, formed cutting seams have consistency, and cutting quality is effectively improved; in addition, because the core head and the core rod of the cutting nozzle are integrated, when oxygen passes through, the phenomenon of air leakage cannot occur, and the safety is better;

(4) through the structural design of the mixed gas inlet groove, the mixed gas inlet of the cutting nozzle rod seat is simple in processing and forming mode, the die can be used repeatedly, the formed mixed gas inlet groove has good consistency, additional processing is not needed in other auxiliary tools or hole processing modes, the processing efficiency is obviously improved, and the batch production of products is facilitated;

(5) the coaxial fixed installation of the cutting nozzle core head is realized by arranging the core head positioning section, so that the phenomenon of uneven air outlet caused by the non-coaxial core heads can be effectively avoided, and meanwhile, the core head positioning section also has the function of enabling the air flow to be more stable and ordered, so that the annular air flow discharged from the mixed gas annular air outlet channel is stable and the movement flow rate is high, the formed flame is longer, and the preheating and cutting speeds are improved;

(6) the invention has simple structure and reasonable design, is convenient to process by adopting an integrally formed structure, and is more convenient to disassemble and assemble through conical surface matching; in addition, the coaxiality of the front end and the rear end of the cutting nozzle core rod can be ensured, the air outlet is ensured to be smoother, the air outlet speed is improved, and the cutting quality is ensured; meanwhile, due to the special design of the cutting torch rod seat, the cutting torch core head structure and the like, the processing efficiency of the cutting torch is obviously improved, and the batch production of products is facilitated.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is a schematic diagram of the structure of the first embodiment of the present invention;

FIG. 3 is a schematic structural view of a core sleeve of a cutting torch in accordance with an embodiment of the present invention;

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

FIG. 5 is an enlarged schematic view at C in FIG. 3;

FIG. 6 is an enlarged sectional view taken along line A-A of FIG. 2;

FIG. 7 is an enlarged view of a section taken in the direction B of FIG. 2;

FIG. 8 is a schematic view of the engagement of a core head and a cutting torch outer sleeve of a second cutting torch embodiment of the present invention;

FIG. 9 is a schematic diagram of the structure of a third embodiment of the present invention;

FIG. 10 is a schematic diagram of a background art structure;

in the figure: 1-cutting nozzle jacket; 2-cutting nozzle core bar; 3-cutting nozzle rod seat; 31-outer conical surface; 32-mixed gas inlet groove; 33-a parting surface; 34-left mold half; 35-right half mould; 4-cutting a nozzle core head; 41-mixed gas guide groove; 42-mixed gas guide bar; 43-core print positioning surface; 44-core print positioning section; 45-core outlet section; 5-oxygen channel; 6-a mixed gas channel; 7-a mixed gas inlet; 8-mixed gas annular gas outlet channel; 9-positioning shoulders.

Detailed Description

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

The first embodiment is as follows:

as shown in fig. 1 to 7, the powder metallurgy cutting tip for acetylene cutting torch is mainly used for acetylene gas; the structure comprises a cutting torch outer sleeve 1, wherein a cutting torch core rod 2 is installed in the cutting torch outer sleeve 1, a cutting torch rod seat 3 is arranged at the rear end of the cutting torch core rod 2, the cutting torch rod seat 3 is installed at the rear end of the cutting torch outer sleeve 1 in a conical surface fit mode, a cutting torch core head 4 is arranged at the front end of the cutting torch core rod 2, and a rod seat fixing structure is further arranged between the cutting torch rod seat and the cutting torch outer sleeve; the cutting torch core rod 2, the cutting torch rod seat 3 and the cutting torch core head 4 are integrally formed to form a cutting torch core sleeve.

An oxygen channel 5 penetrates through the center of the cutting nozzle core sleeve, and oxygen is introduced into the oxygen channel 5 to realize the cutting effect; the cutting torch is characterized in that a mixed gas channel 6 is arranged between the cutting torch core rod 2 and the cutting torch outer sleeve 1, a plurality of mixed gas inlets 7 communicated with the mixed gas channel 6 are arranged between the cutting torch rod seat 3 and the cutting torch outer sleeve 1, a cylindrical hole used for installing the cutting torch core head 4 is formed in the front end of the cutting torch outer sleeve 1, the rear end of the cutting torch core head 4 is coaxially fixed in the cutting torch outer sleeve 1, a mixed gas annular gas outlet channel 8 communicated with the mixed gas channel 6 is arranged between the front end of the cutting torch core head 4 and the cutting torch outer sleeve 1, mixed gas enters the mixed gas channel 6 from the mixed gas inlets 7, and then is discharged from the mixed gas annular gas outlet channel 8, and the mixed gas refers to mixed gas of acetylene gas and oxygen.

The rear end of the cutting torch core sleeve is installed at the rear end of the cutting torch outer sleeve 1 through the cutting torch rod seat 3 in a conical surface fit mode, coaxiality between the cutting torch rod seat 3 and the cutting torch outer sleeve 1 is guaranteed, and the front end of the cutting torch core sleeve is used for ensuring coaxiality between the cutting torch core head 4 and the cutting torch outer sleeve 1 by coaxially fixing the cutting torch core head 4 at the front end of the cutting torch outer sleeve 1; the coaxiality of the front end and the rear end of the cutting torch core sleeve is guaranteed, particularly, the coaxiality of the cutting torch core head 4 is guaranteed, after the cutting torch core head 4 is cut at high temperature for a long time, the cutting torch core head 4 is heated and even can deform, the coaxiality between the cutting torch outer sleeves 1 can still be kept, mixed gas is discharged from a gap between the cutting torch core head 4 and the cutting torch outer sleeves 1 and is kept uniform all the time, the gas is discharged smoothly, and the problems that the gas is not uniformly discharged due to the fact that the air is not matched through threaded connection in the traditional design are effectively avoided.

The cutting torch rod seat 3 is arranged on the cutting torch outer sleeve 1 through the rod seat fixing structure, a torch rod is not connected on the outer sleeve through threads as in the prior art, the matching installation mode is simple, and the quick installation effect can be realized; meanwhile, the stability of connection between the cutting torch rod seat 3 and the cutting torch outer sleeve 1 can be ensured, and the problem that the connection is dropped and the like to influence the use safety is avoided.

The cutting torch core rod 2, the cutting torch rod seat 3 and the cutting torch core head 4 are integrally formed to form a cutting torch core sleeve, the torch core is not connected to the core rod through threads as in the prior art, the integrally formed structure of the device is formed at one time through a die, the processing mode is more convenient, the cost is lower, and mass production can be realized; in addition, as in the prior art, threads are not required to be processed and matched after being processed respectively, so that the interchangeability between the cutting nozzle core sleeve and the cutting nozzle outer sleeve 1 of the device is high, and the matching degree is good; when oxygen passes through the oxygen channel 5, a connecting seam generated by thread matching does not exist, airflow resistance is small, smoothness and stability of oxygen flowing can be effectively guaranteed, gas is discharged quickly and stably, formed cutting seams have consistency, and cutting quality is effectively improved; in addition, because the cutting nozzle core head 4 and the cutting nozzle core rod 2 are of an integrated structure, when oxygen passes through, the phenomenon of air leakage cannot occur, and the safety is better.

The invention has simple structure and reasonable design, is convenient to process by adopting an integrally formed structure, and is more convenient to disassemble and assemble through conical surface matching; in addition, the coaxiality of the front end and the rear end of the cutting nozzle core rod can be ensured, the air outlet is ensured to be smoother, the air outlet speed is improved, and the cutting quality is ensured; meanwhile, due to the special designs of the cutting torch rod seat, the cutting torch core head structure and the like, the processing efficiency of the cutting torch is obviously improved, and the batch production of products is facilitated.

The front end of the cutting torch core head 4 is flush with the front end of the cutting torch outer sleeve 1, and the structure of the cutting torch is the same as that of an annular cutting torch for acetylene in the prior art.

The oxygen channel 5 is formed by the transition of a large-diameter cylindrical channel from back to front through a conical surface, so that a small-diameter cylindrical channel is formed, when oxygen enters the small-diameter cylindrical channel from the large-diameter cylindrical channel, the diameter is suddenly reduced, the flow velocity of the oxygen is suddenly increased, and the quick air outlet effect can be realized; mix gas passageway 6 and pass through the conical surface transition by major diameter ring passageway from back forward and form minor diameter ring passageway, mix the gas and get into to minor diameter ring passageway by major diameter ring passageway when, because the diameter diminishes suddenly for mix the gas velocity of flow increase suddenly, can realize giving vent to anger the effect fast.

Referring to fig. 3, the outer circumference of the cutting torch rod base 3 is provided with an outer conical surface 31, the rear end of the cutting torch outer sleeve 1 is provided with an inner conical hole which is matched with the outer conical surface 31, and 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 high coaxiality and can be quickly installed.

The rod seat fixing structure comprises a self-locking conical surface between the outer conical surface 31 and the inner conical hole and/or a welding part arranged between the cutting nozzle outer sleeve 1 and the cutting nozzle rod seat 3. The welding part can be spot welding or seam welding, adopts seam welding in this embodiment, not only can realize stable installation, can further guarantee the sealed effect of fitting surface department simultaneously.

Cutting torch pole socket 3 passes through pole socket fixed knot constructs fixed mounting in cutting torch overcoat 1, pole socket fixed knot constructs including three kinds of structures, is respectively: the rod seat fixing structure comprises a self-locking conical surface fit between an outer conical surface 31 and an inner conical hole, the fitting surface of the outer conical surface 31 and the inner conical hole can form a self-locking conical surface, the outer conical surface 31 is installed in the inner conical hole in a fit mode during installation, the self-locking conical surface fit is utilized to realize fixed installation between the outer conical surface and the inner conical hole, the inner conical hole and the outer conical surface 31 are in interference fit, the cutting nozzle rod seat 3 is installed in the inner conical hole through extrusion and then is stably installed by utilizing a self-locking principle instead of a sleeve fit mode in the prior art, a certain coaxiality can be guaranteed in the sleeve fit mode, the effect is poorer than that of the invention, and in addition, the sleeve fit mode cannot accurately guarantee the stability and the sealing performance of connection between the outer conical surface and the inner conical hole; the rod seat fixing structure comprises a welding part arranged between the cutting torch outer sleeve 1 and the cutting torch rod seat 3, and at the moment, after the outer conical surface 31 is installed in the inner conical hole in a matching mode, the outer end of the matching surface of the cutting torch rod seat 3 and the cutting torch outer sleeve 1 is welded and fixed, so that the fixed installation between the outer conical surface and the inner conical hole is realized; and thirdly, the rod seat fixing structure comprises an outer conical surface 31 and a self-locking conical surface between the inner conical holes, and also comprises a welding part arranged between the cutting torch outer sleeve 1 and the cutting torch rod seat 3, wherein the cutting torch rod seat 3 and the cutting torch outer sleeve 1 are combined and fixed in two modes. In order to ensure the use effect of the cutting torch, the cutting torch core sleeve and the cutting torch outer sleeve 1 are installed when the cutting torch is delivered from a factory, 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 rod seat 3 is installed on the cutting torch outer sleeve 1 in a matched mode through the self-locking conical surface before the cutting torch is delivered from the factory, and the rear end face of the cutting torch rod seat 3 is flush with the rear end face of the cutting torch outer sleeve 1 after the installation is completed; however, in order to avoid the phenomenon that the cutting torch core sleeve is separated from the cutting torch outer sleeve 1 due to bumping or collision in the transportation process and also avoid the damage caused by the fact that the cutting torch core head 4 is collided once separated, welding and fixing are carried out on the matching surface of the cutting torch rod seat 3 and the cutting torch outer sleeve 1, namely, a layer of installation guarantee is further added on the basis of self-locking fixing installation.

In the prior art, the traditional design of the mixed gas inlet 7 is that a through hole is formed in the non-peripheral side in the rod seat, so that additional processing is required to be performed on a mixed gas hole, the operation is more complicated, one processing mode of the through hole is mainly that a rod which is beneficial to forming the through hole is additionally arranged for forming the through hole when a die is formed, the mode of forming the through hole by utilizing the rod increases the complexity and difficulty of die manufacturing, and the positioning of the rod is more complicated; the other processing mode is mainly characterized in that after the product is molded or machined by a product mold, other hole processing modes are adopted for machining, and the processing mode is complex in operation, so that the working efficiency is low and flaws are easy to form. The periphery of the cutting torch rod seat 3 is provided with a plurality of mixed gas inlet grooves 32, and the mixed gas inlet grooves 32 and the cutting torch outer sleeve 1 are enclosed to form the mixed gas inlet 7. The processing mode of the mixed gas inlet groove 32 is simpler, the mixed gas inlet groove 32 is arranged on the outer peripheral side of the cutting nozzle rod seat 3, although the mixed gas inlet groove 32 cannot achieve the function of introducing mixed gas in a separated mode, the mixed gas inlet groove and the cutting nozzle outer sleeve 1 are enclosed together, and a hole structure which is the same as that of the mixed gas inlet 7 in the prior art is formed between the mixed gas inlet groove and the cutting nozzle outer sleeve 1.

Referring to fig. 4, the mixed gas inlet grooves 32 on both sides of the cutting torch rod base 3 are symmetrically arranged, the openings of the mixed gas inlet grooves 32 on the same side face the same direction, and the openings of the mixed gas inlet grooves 32 on both sides face opposite directions; the mixed gas inlet groove 32 is a groove convenient for outward demoulding, and the mixed gas inlet groove 32 can be a curved groove, a rectangular groove, a trapezoidal groove, a triangular groove or a combined groove and the like which are convenient for demoulding; and the mixed gas inlet groove 32 is a straight groove along the axial direction of the cutting nozzle rod seat 3, which is convenient for processing and demoulding, and is shown in figure 3.

Taking the direction shown in fig. 4 as an example, the left and right mixed gas inlet grooves 32 are symmetrical, that is, a symmetrical plane is formed on the cutting torch holder 3, and the symmetrical plane is a parting plane 33 of the left half mold 34 and the right half mold 35; the mixed gas inlet groove 32 is formed when the cutting torch core rod 2 is molded, at the moment, a rod which is beneficial to hole forming is not required to be added into the mold, but an arc-shaped bulge which is beneficial to forming the mixed gas inlet groove 32 is added on the surface of the mold, referring to figure 4, when the cutting torch rod seat 3 is molded, a left half mold 34 and a right half mold 35 are respectively adopted on the left side and the right side by taking a mold parting surface 33 as a boundary, therefore, when demolding is carried out, only the left half mold 34 is opened towards the left side, referring to the direction I in figure 4, the right half mold 35 is opened towards the right side, referring to the direction II in figure 4, by adopting the molding and demolding mode, the processing and molding mode of the mixed gas inlet 7 is simpler, the mold can be repeatedly used, the structure of the formed mixed gas inlet groove 32 has good consistency, and no other auxiliary tools or additional processing is required by the hole processing, is beneficial to the mass production of products. The mixed gas inlet channel 32 is avoided from being arranged on the parting plane 33 when designing the mould.

In this embodiment, each mixed gas inlet groove 32 is a curved groove, specifically, each mixed gas inlet groove 32 includes an arc-shaped groove hole with an opening facing outward, two opening ends of the arc-shaped groove hole are provided with mold release surfaces beneficial for mold release, the openings of the arc-shaped groove holes of the mixed gas inlet grooves 32 on the same side face outward, and the mold release surfaces of the mixed gas inlet grooves 32 on the same side are the same and parallel to the side direction; the demoulding face of all left mixed gas air inlet grooves 32 all is perpendicular with parting face 33, and the demoulding face of all mixed gas air inlet grooves 32 on same right side all is perpendicular with parting face 33, and the arc slotted hole of mixed gas air inlet groove 32 all is tangent with the demoulding face, and left mixed gas air inlet groove 32's opening and edge all face left side, right side promptly mixed gas air inlet groove 32's opening and edge all face the right side, do not appear the curved surface of colluding back. Referring to fig. 4, the left side and the right side are respectively provided with three mixed gas inlet grooves 32, the mixed gas inlet groove 32 in the middle is vertically symmetrical, and the mixed gas inlet grooves 32 in the upper part and the lower part are vertically symmetrical, so that the processing of the die is facilitated.

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 nozzle outer sleeve 1 is a powder metallurgy outer sleeve, and the cutting nozzle core sleeve is a powder metallurgy core sleeve. The cutting torch outer sleeve 1 and the cutting torch core sleeve are processed and manufactured by adopting a powder metallurgy process, and the processing comprises the following specific steps:

(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 mold for injection molding according to the size and the structure of the cutting nozzle outer sleeve 1 and the cutting nozzle core sleeve, and injecting the raw materials into the mold by using an injection molding machine for molding;

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

The cutting torch core sleeve is complex in structure and comprises a cutting torch core rod 2, a cutting torch rod seat 3 and a cutting torch core head 4, and in order to ensure that demoulding is more convenient and smooth, a combined die is adopted during processing of the cutting torch core sleeve, namely a left half die 34, a right half die 35 and a lower half die, wherein the lower half die is used for forming the cutting torch core head 4, and the left half die 34 and the right half die 35 are matched for forming the cutting torch core rod 2 and the cutting torch rod seat 3; during forming and demolding, the left half die 34 is opened towards the left side, see direction I in fig. 3, the right half die 35 is opened towards the right side, see direction II in fig. 3, the lower half die is opened towards the front end, see direction III in fig. 3, a finished product formed by the method does not need to additionally process holes or gas guide grooves and the like, the processing method is simpler, the production efficiency is high, the consistency of the produced cutting nozzle is better, and each cutting nozzle core sleeve and the cutting nozzle outer sleeve 1 can be replaced mutually in the cutting nozzle assembling process; in addition, the cutting nozzle formed by the invention is a stainless steel cutting nozzle, the hardness, the wear resistance and the like of the structure are good, the deformation is not easy, and the service life is long.

Referring to fig. 3, 5, 6 and 7, the rear end of the cutting torch core head 4 is provided with a core head positioning section 44 coaxially fixed in the cutting torch outer sleeve 1, the front end of the cutting torch core head 4 is provided with a core head outlet section 45 in clearance fit with the cutting torch outer sleeve 1, and the mixed gas annular gas outlet channel 8 is arranged between the core head outlet section 45 and the cutting torch outer sleeve 1. The periphery of core head positioning segment 44 is provided with a plurality of mixed gas conducting strips 42 that are the annular array, and adjacent two be provided with mixed gas guide slot 41 between the mixed gas conducting strip 42, mixed gas guide slot 41 extends along the axis direction, mixed gas guide slot 41 will mixed gas annular gas outlet channel 8 with communicate between the mixed gas passageway 6. Referring to fig. 2, the rear end of the mixed gas guide groove 41 is located behind the matching position between the mixed gas guide strip 42 and the cutting torch outer sleeve 1, that is, the rear end of the mixed gas guide groove 41 is not matched with the cutting torch outer sleeve 1 but is communicated with the mixed gas channel 6 for realizing gas flow conduction, and the front end of the mixed gas guide groove 41 extends forward to the mixed gas annular outlet channel 8, so that the mixed gas in the mixed gas channel 6 firstly enters the mixed gas guide groove 41 through the rear end of the mixed gas guide groove 41, then moves forward along the mixed gas guide groove 41, and is discharged from the front end of the mixed gas annular outlet channel 8.

When the mixed gas in the mixed gas channel 6 enters the mixed gas guide groove 41, the movement direction of the gas flow is disordered and disordered due to the change of the movement path of the mixed gas, if no measures are taken, the gas flow continues to move in the disordered way, so that the discharged gas flow has the phenomena of unstable gas outlet, unsmooth gas outlet and the like, and the preheating effect is influenced; in order to solve the problem, the peripheries of all the mixed gas guide bars 42 jointly form a core head positioning surface 43 which is fastened on the cutting torch outer sleeve 1, and all the mixed gas guide bars 42 and the cutting torch outer sleeve 1 are in interference fit, namely all the mixed gas guide bars 42 jointly form a positioning structure which is fastened in the cutting torch outer sleeve 1 and is used for ensuring the mounting coaxiality between the cutting torch core head 4 and the cutting torch outer sleeve 1; in this section, because all the mixed gas guide bars 42 and the cutting nozzle outer sleeve 1 have no gap, any two adjacent mixed gas guide grooves 41 in this section are separated by the mixed gas guide bar 42 positioned in the middle, so the mixed gas passing through the mixed gas guide grooves 41 in the core head positioning section 44 is mutually independent, a separate gas beam is formed in each mixed gas guide groove 41 in the core head positioning section 44, the mixed gas moving to the core head positioning section 44 from the mixed gas channel is forcedly separated into dispersed gas flows, the overall disordered and disordered gas flow is divided into a plurality of small gas flows, then the gas flows move along each mixed gas guide groove 41, in the moving process, because the gas flows in each mixed gas guide groove 41 are not interfered with each other, and each gas flow moves for a section of stroke independently, the gas flows in each mixed gas guide groove 41 can become orderly and stable rapidly, at the moment, the airflow entering the mixed gas annular air outlet channel 8 tends to be stable, and the stability of the airflow discharged to the outside of the cutting nozzle is obviously better than that of the prior art; the mixed gas annular gas outlet channel 8 of the core head outlet section 45 is of an annular structure, so that the section has no positioning function; in addition, the mixed gas entering the core head outlet section 45 is not forcibly separated any more, but forms a continuous annular gas flow, and is discharged along the annular mixed gas outlet channel 8 in an annular shape, which is beneficial to preheating a cutting piece; in the invention, the coaxial fixed installation of the cutting nozzle core head 4 is realized by arranging the core head positioning section 44, the phenomenon of uneven air outlet caused by non-coaxial core heads can be effectively avoided, and meanwhile, the core head positioning section 44 also has the function of enabling the air flow to be more stable and orderly, so that the annular air flow discharged from the mixed gas annular air outlet channel 8 is stable and has high movement flow rate, the formed flame is longer, and the preheating and cutting speed is improved.

In this embodiment, all the mixed gas guide bars 42 have the same structure, and the core positioning surface 43 formed by the core positioning section 44 is a cylindrical surface, so that the processing is convenient, and the core positioning surface 43 can also be a conical positioning surface which is retracted towards the front end, so that the core positioning surface can be more conveniently positioned with the cylindrical hole of the cutting torch outer sleeve 1; the core head outlet section 45 is also arranged to be in a cylindrical structure, so that a gap formed between the core head outlet section and a cylindrical hole formed by the cutting nozzle outer sleeve 1 is not changed, and the movement of air flow can be ensured to be stable; of course, the core head outlet section 45 may also be in a conical structure, and the gap between the outer wall of the core head outlet section 45 and the cutting nozzle outer sleeve 1 is gradually increased.

The number of the mixed gas guide strips 42 is at least 3, and the mixed gas guide strips are used for having a coaxial fixed mounting effect, the more the number of the mixed gas guide strips 42 is, the better the fixed mounting effect is, and the more dispersed the gas flow is, the more stable the gas flow is after passing; the number of the mixed gas guide strips 42 is set according to actual use requirements, but the number is not excessive, and the excessive number can influence the rapid passing of the gas flow, so that the gas flow movement resistance is excessive. In the present embodiment, eight uniformly arranged mixed gas bars 42 are provided.

Example two:

the second embodiment is basically the same as the first and third embodiments, and the difference is mainly the structure of the cutting nozzle core head 4: referring to fig. 8, the peripheries of at least three uniformly arranged mixed gas guide bars 42 in the core print positioning section 44 together form a core print positioning surface 43 for fastening on the cutting torch outer sleeve 1, and the rest of the mixed gas guide bars 42 are in clearance fit with the cutting torch outer sleeve 1. The total number of the mixed gas guide bars 42 is at least six, wherein at least three of the mixed gas guide bars are used for coaxial fixation; referring to fig. 8, in the present embodiment, eight mixed gas guide bars 42 are provided, and the peripheries of four uniformly provided mixed gas guide bars 42 form core positioning surfaces 43, which together form a positioning structure for fastening in the cutting torch outer sleeve 1, so as to ensure the coaxiality of the connection between the cutting torch core 4 and the cutting torch outer sleeve 1; meanwhile, the mixed gas guide strip 42 has a positioning function, and has the same function as the mixed gas guide strip 42 in the first embodiment because the mixed gas guide strip separates continuous gas flow, so that the gas flow is dispersed and the order and the stability of the gas flow are improved; in order to avoid the problem that the resistance is too large due to the large number of the mixed gas guide strips 42, which causes the reduction of the gas flow rate and the poor preheating effect, in the first embodiment, gaps are formed between the rest of the mixed gas guide strips 42 and the cutting torch outer sleeve 1, which has no positioning function and only has a flow guiding function, and since the two mixed gas guide strips 41 are not completely separated, the movement resistance between the gas flow and the preheating gas guide groove is reduced, the gas flow rate is relatively high, the formed flame is long, and thus the preheating and cutting speeds are increased.

Example three:

the third embodiment is basically the same as the first and second embodiments, wherein the third embodiment is that another vertical positioning structure is added on the basis of other embodiments, as shown in fig. 10, the outer circumference of the cutting torch rod seat 3 is provided with an outer conical surface 31, and the rear end of the cutting torch outer sleeve 1 is provided with an inner conical hole which is matched with the outer conical surface 31; the outer conical surface 31 with still correspond on the fitting surface of interior taper hole and be provided with location circular bead 9, when can guaranteeing the installation through location circular bead 9, what cutting torch rod seat 3 can be accurate installs in cutting torch overcoat 1, make things convenient for installer to operate.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. The powder metallurgy cutting torch for the acetylene cutting torch comprises a cutting torch outer sleeve, and is characterized in that: a cutting torch core rod is installed in the cutting torch outer sleeve, a cutting torch rod seat is arranged at the rear end of the cutting torch core rod, an outer conical surface is arranged on the periphery of the cutting torch rod seat, an inner conical hole matched with the outer conical surface is formed in the rear end of the cutting torch outer sleeve, and a rod seat fixing structure is further arranged between the cutting torch rod seat and the cutting torch outer sleeve; the front end of the cutting torch core rod is provided with a cutting torch core head, and the cutting torch core rod, the cutting torch rod seat and the cutting torch core head are integrally formed to form a cutting torch core sleeve;

an oxygen channel penetrates through the center of the cutting nozzle core sleeve; a mixed gas channel is arranged between the cutting torch core rod and the cutting torch outer sleeve, a plurality of mixed gas inlets communicated with the mixed gas channel are arranged between the cutting torch rod seat and the cutting torch outer sleeve, the rear end of the cutting torch core head is coaxially fixed in the cutting torch outer sleeve, and a mixed gas annular gas outlet channel communicated with the mixed gas channel is arranged between the front end of the cutting torch core head and the cutting torch outer sleeve.

2. A powder metallurgy cutting tip for an acetylene cutting torch as set forth in claim 1, wherein: the rod seat fixing structure comprises a self-locking conical surface between the outer conical surface and the inner conical hole, and/or a welding part arranged between the cutting torch outer sleeve and the cutting torch rod seat.

3. A powder metallurgy cutting tip for an acetylene cutting torch as set forth in claim 1, wherein: the periphery of the cutting torch rod seat is provided with a plurality of mixed gas inlet grooves, and the mixed gas inlet grooves and the cutting torch outer sleeve are surrounded to form the mixed gas inlet.

4. A powder metallurgy cutting tip for an acetylene cutting torch as set forth in claim 3, wherein: the mixed gas inlet grooves on two sides of the cutting nozzle rod seat are symmetrically arranged, the openings of the mixed gas inlet grooves on the same side face the same direction, and the opening directions of the mixed gas inlet grooves on two sides are opposite; the mixed gas inlet groove is a groove convenient for outward demoulding.

5. A powder metallurgy cutting tip for an acetylene cutting torch as set forth in claim 1, wherein: the rear end of the cutting torch core head is provided with a core head positioning section coaxially fixed in the cutting torch outer sleeve, the front end of the cutting torch core head is provided with a core head outlet section in clearance fit with the cutting torch outer sleeve, and the mixed gas annular gas outlet channel is arranged between the core head outlet section and the cutting torch outer sleeve.

6. A powder metallurgy cutting tip for an acetylene cutting torch as set forth in claim 5, wherein: the periphery of core head location section is provided with a plurality of mixed gas conducting strips that are the annular array, adjacent two be provided with the mixed gas guide slot between the mixed gas conducting strip, the mixed gas guide slot will mixed gas annular gas outlet channel with communicate between the mixed gas passageway.

7. A powder metallurgy cutting tip for an acetylene cutting torch as set forth in claim 6, wherein: the peripheries of all the mixed gas guide bars jointly form a core head positioning surface which is used for being fastened on the cutting nozzle outer sleeve.

8. A powder metallurgy cutting tip for an acetylene cutting torch as set forth in claim 5, wherein: the peripheries of at least three uniformly arranged mixed gas guide bars jointly form a core head positioning surface which is used for being fastened on the cutting torch outer sleeve, and the rest mixed gas guide bars are in clearance fit with the cutting torch outer sleeve.

9. A powder metallurgy cutting tip for an acetylene cutting torch as set forth in claim 1, wherein: and a positioning shoulder is correspondingly arranged on the matching surface of the outer conical surface and the inner conical hole.

10. A powder metallurgy cutting tip for an acetylene cutting torch according to any of claims 1 to 9, characterized in that: the cutting nozzle outer sleeve is a powder metallurgy outer sleeve, and the cutting nozzle core sleeve is a powder metallurgy core sleeve.

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