CN209867629U

CN209867629U - Acetylene cutting torch

Info

Publication number: CN209867629U
Application number: CN201920596997.XU
Authority: CN
Inventors: 陈松炳
Original assignee: Ningbo Fenghua Yizhou Welding And Cutting Tools Co Ltd
Current assignee: Ningbo Fenghua Yizhou Welding And Cutting Tools Co Ltd
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2019-12-31
Anticipated expiration: 2029-04-28

Abstract

The utility model discloses an acetylene cutting torch, one end of which is provided with an air inlet end, the other end of which is provided with an air outlet end, the air inlet end is provided with an air inlet mechanism, the air outlet end is provided with a flame spraying mechanism, the cutting torch also comprises an oxygen flow mechanism, and the oxygen flow mechanism is communicated with the air inlet end and the air outlet end; the acetylene cutting nozzle comprises an outer nozzle and an inner nozzle, the inner nozzle is sleeved in the outer nozzle, a mixed gas cavity is arranged between the inner nozzle and the outer nozzle, and the mixed gas cavity is communicated with the gas inlet mechanism and the flame spraying mechanism; the oxygen flow mechanism is penetratingly arranged in the inner nozzle; outer mouth and interior mouth cooperation back have formed first sealed end and the sealed end of second, and the mechanism that spouts a fire sets up in the sealed end department of second. The acetylene cutting nozzle takes a copper bar as a raw material, a prefabricated part of the outer nozzle and the inner nozzle is obtained by cold heading processing, and the outer nozzle and the inner nozzle are sleeved and then forged and processed to be integrated into an integral structure. The utility model is easy to process, and the flame spraying pressure is more uniform; has the characteristics of less feeding and high processing speed, and reduces the production cost.

Description

Acetylene cutting torch

Technical Field

The utility model relates to a gas flame cutting especially relates to an acetylene cutting torch for gas flame cutting.

Background

Gas cutting is to preheat metal to a molten state by utilizing high temperature generated by mixing and burning combustible gas and oxygen, and simultaneously to form a gas cutting seam by means of blowing and cutting of high-pressure cutting oxygen flow, thereby achieving the purpose that the metal is cut. The gas cutting technology is widely applied to the field of metal cutting in various manufacturing industries and other industries, wherein a cutting nozzle is used as a key part and is very important for influencing the performance of the whole cutting.

The traditional cutting nozzle is generally prepared by brass or red copper, for example, the utility model patent with the patent number of CN200910155486.5, "a cutting torch cutting nozzle and processing method thereof" discloses a processing method of the cutting nozzle, which comprises a plurality of steps of penetrating steel wires and pulling out the steel wires, the cutting nozzle for general oxygen-acetylene cutting is mostly of an integral structure and is manufactured by drawing/processing after punching, and for the red copper material, the micro-holes and deep holes are drilled on the cutting nozzle which are all very difficult, thereby causing the problems of time waste, labor waste and material waste, high cost and serious raw material waste. The processing and production of the current acetylene cutting nozzle have high requirements on the technological operation of technicians, so that the acetylene cutting nozzle is not suitable for automatic production and manufacturing, and the process is carried out for a long time.

The split cutting nozzle structure combination is widely applied to the existing oxygen-propane cutting nozzle and has the advantage of convenient production. Because the explosion upper limit of acetylene is 8.4 times of that of propane, the flame propagation speed is higher than that of propane, the danger is far higher than that of propane, and because the split type components are not precise enough, the tempering explosion phenomenon is easy to generate for oxygen-acetylene cutting, and the potential safety hazard is brought to the operation, so the acetylene cutting torch is generally produced by the process of integrally processing the red copper rod. In addition, the mixed gas channel in the acetylene cutting nozzle on the market is usually small in size, the mixed gas is firstly mixed outside and then flows into the cutting nozzle, and the gas in the cutting nozzle is easy to be uneven due to the narrow inner cavity.

Therefore, those skilled in the art have devoted themselves to develop an acetylene cutting torch which has the advantages of easy processing and production, low processing cost, less raw material consumption of products, more sufficient and uniform gas mixing during use, and higher safety.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is that the small volume of the air mixture cavity leads to mixing inadequately in the cutting torch of the cutting of the oxygen-acetylene cutting of red copper material processing difficulty, production.

In order to realize the aim, the utility model provides an acetylene cutting torch, one end of the cutting torch is provided with an air inlet end, the other end of the cutting torch is provided with an air outlet end, the air inlet end is provided with an air inlet mechanism, the air outlet end is provided with a flame spraying mechanism, the cutting torch also comprises an oxygen flow mechanism, and the oxygen flow mechanism is communicated with the air inlet end and the air outlet end; the acetylene cutting nozzle comprises an outer nozzle and an inner nozzle, the inner nozzle is sleeved in the outer nozzle, a mixed gas cavity is arranged between the inner nozzle and the outer nozzle, and the mixed gas cavity is communicated with the gas inlet mechanism and the flame spraying mechanism; the oxygen flow mechanism is penetratingly arranged in the inner nozzle; outer mouth and interior mouth cooperation back have formed first sealed end and the sealed end of second, and the mechanism that spouts a fire sets up in the sealed end department of second.

Preferably, the outer nozzle and the inner nozzle are both made of red copper. The red copper has high melting point and good heat conductivity, can better radiate heat, and molten iron splashed during gas cutting cannot be adhered to the cutting torch to damage the cutting torch, so that the service life of the cutting torch is prolonged.

Furthermore, the two ends of the cutting nozzle are subjected to plastic processing to enable the first sealing end and the second sealing end to be tightly attached, and the outer nozzle and the inner nozzle are integrated into an integral structure. The first and second sealed ends between the outer and inner mouths are sealed except for the flame ejection mechanism formed at the second sealed end.

Furthermore, the inner nozzle is recessed near the air inlet end to form an air groove, the air groove is communicated with the air inlet mechanism, and the lower side of the air groove is provided with a protruding part. Through the air duct, the mechanism of admitting air can fully switch on the gas mixture chamber, and the protruding portion makes the middle part of interior mouth keep higher intensity and realize the uniformity of current product to the burning torch on the matching.

Furthermore, the outer nozzle is provided with a connecting groove at the air inlet end, the inner nozzle is provided with a connecting table at the air inlet end, the connecting groove is matched with the connecting table, and the connecting table is embedded into the connecting groove and compressed to form a first sealing end. Particularly, the connecting groove is in interference fit with the connecting table, so that the sealing property and the bonding strength are ensured.

Furthermore, the air inlet mechanism comprises a plurality of air inlets which are uniformly distributed along the circumferential direction of the connecting platform, and the air inlets penetrate through the connecting platform and are communicated with the mixed air cavity. Preferably, the number of the air intake holes is 6.

Furthermore, the oxygen flow mechanism is composed of a plurality of sections of oxygen flow channels from the air inlet end to the air outlet end in sequence, the inner diameter of each oxygen flow channel is reduced from the air inlet end to the air outlet end in sequence, and the effect of adjusting the air flow is achieved by adjusting the inner diameter of the oxygen flow mechanism.

Furthermore, the flame projecting mechanism comprises a plurality of flame projecting holes which are evenly distributed, and the flame projecting holes are communicated with the mixed gas cavity. Preferably, the number of the flame ejection holes is set to 6.

In the preferred embodiment of the present invention, the flame hole is formed by inserting a steel wire into a milled groove formed in the outer wall of the inner nozzle and then forging the steel wire. Alternatively, the milled groove is milled into the outer wall of the inner nozzle or is formed by punching a hole at the second sealing end. Specifically, the implementation method comprises the following steps: the end of giving vent to anger at interior mouth follows the setting for position milling flutes of bocca along the outer wall, with interior mouth and outer mouth assembly, penetrates the steel wire back according to cutting torch mouth number specification in the milling flutes, through forging and pressing shaping, the outer mouth and the interior mouth joint of the end of giving vent to anger and make the aperture of milling flutes reduce to the steel wire size and form the bocca. The second implementation method comprises the following steps: the inner nozzle and the outer nozzle are assembled, the inner nozzle is punched along the set position of the second sealing end according to the fire spraying hole, a steel wire penetrates into the punched hole, and the outer nozzle and the inner nozzle are closed to form the second sealing end through forging, so that the punched hole diameter is reduced to form the fire spraying hole.

The specific production process of the acetylene cutting nozzle comprises the following steps:

(1) the method comprises the following steps of processing a copper bar serving as a raw material into an outer nozzle prefabricated part and an inner nozzle prefabricated part respectively, wherein the outer nozzle prefabricated part is of a sleeve structure with a connecting groove, the inner nozzle prefabricated part is of a cylindrical structure with a connecting table, and the outer diameter of the inner nozzle prefabricated part with an air inlet end and an air outlet end is smaller than the inner diameter of the outer nozzle prefabricated part;

(2) sleeving the processed inner nozzle prefabricated part into the outer nozzle prefabricated part, and punching the connecting table into the connecting groove in an interference fit manner at the air inlet end to form a whole to form a first sealing end;

(3) forging and molding the outer nozzle prefabricated member and the inner nozzle prefabricated member at the air outlet end to form a second sealing end to obtain a primary finished product of the cutting nozzle;

(4) and (3) performing finish machining on the primary finished product according to the product requirements, flatting and chamfering the air inlet end and the air outlet end, turning an outer circle on the outer wall of the primary finished product, processing an oblique angle on the air outlet end to form a cutting nozzle mouth with the head part having the reduced outer diameter, enabling the external parameters to meet the design requirements, polishing the outer surface, cleaning and drying to obtain the final product.

Further, high-precision equipment (such as a machining center) is selected for machining the inner nozzle prefabricated part, the center is communicated with the oxygen flow mechanism, and air inlet holes are uniformly punched at the air inlet end along the circumferential direction.

Optionally, when the inner nozzle prefabricated member is processed by cold heading, a joint connected with the gas circuit is processed at the gas inlet end.

Preferably, the raw material used for the production is a copper bar.

Further, in the step (1), an air groove is cut inwards along the outer wall at the lower side of the connecting platform of the inner nozzle prefabricated member, the air groove is communicated with the air inlet mechanism, and a protruding part is formed at the lower side of the air groove.

Further, in the step (1), the oxygen flow mechanism is processed into a channel formed by a plurality of sections of oxygen flow channels, and the inner diameter of each oxygen flow channel is reduced from the air inlet end to the air outlet end in sequence.

In one embodiment of the utility model, a hole is punched at the air outlet end along the closed surface between the inner nozzle prefabricated member and the outer nozzle prefabricated member, a steel wire is penetrated along the hole according to the specification of the nozzle number, the steel wire is further subjected to fine forging to form a fire spraying hole, and then the steel wire is pulled out to obtain a primary finished product of the nozzle;

in a preferred embodiment, a long groove is milled in advance at the air outlet end of the inner nozzle prefabricated member along the outer wall according to the set position of the flame-spraying hole, in the step (3), after steel wires penetrate into the long groove according to the specification of the cutting nozzle, the outer nozzle prefabricated member and the inner nozzle prefabricated member are jointed through forging and pressing, and the diameter of the long groove is reduced to the size of the steel wires to form the flame-spraying hole. The method provided by the embodiment is simple and feasible in processing the inner nozzle outer wall, is beneficial to quick positioning of the flame-throwing hole, can not cause the deformation of a pore channel due to repeated processing along with the generation of the flame-throwing hole by the sealing surface, reduces a plurality of traditional procedures, does not need to generate the flame-throwing hole through complicated punching operation, and improves the processing efficiency and the processing precision.

Similar to the preferred embodiment, optionally, a hole is drilled at the air outlet end of the inner nozzle prefabricated member according to the set position of the flame hole, a steel wire is penetrated into the drilled hole, the inner nozzle prefabricated member and the outer nozzle prefabricated member are assembled and combined, and then the outer nozzle prefabricated member and the inner nozzle prefabricated member are closed to form a second sealing end through forging and beating, and simultaneously the hole diameter of the drilled hole is reduced to form the flame hole.

In another preferred embodiment, an elongated slot is pre-machined in the inner wall of the outer nozzle prefabricated member, in the step (3), a steel wire is selected, the steel wire penetrates through a hole of the elongated slot at the air outlet end, the outer nozzle prefabricated member and the inner nozzle prefabricated member are combined at the air outlet end through forging and pressing, and the hole diameter of the elongated slot is deformed and reduced to form the flame hole. The method provided by the embodiment is used for processing the outer nozzle prefabricated member in advance, and has the advantages of simplicity, practicability and high efficiency.

The utility model has the following technical characteristics:

(1) in the acetylene cutting nozzle structure, two ends between the outer nozzle and the inner nozzle are sealed to form a mixed gas cavity, and the mixed gas cavity is further forged into an integral structure, so that the acetylene cutting nozzle has larger volume of the mixed gas cavity compared with the traditional product, can fully mix gas, and uniformly sets 6-hole flame spraying pressure more uniformly;

(2) the production process of the acetylene cutting nozzle adopts a mode of respectively cold-heading the outer nozzle and the inner nozzle and then forging the parts into a whole, has the characteristics of less feeding and high processing speed, reduces the production cost and solves the problem of difficult processing of the traditional red copper material flame-spraying hole.

(3) To the acetylene cutting torch product of traditional outer round pin, the cutting torch acceptance of integral type processing is higher, and the utility model discloses a forge integrative structure, do not have the difference in the outward appearance with the integral product on the market, easily promote.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Drawings

Fig. 1 is a schematic structural view of an acetylene cutting torch according to a preferred embodiment of the present invention.

Fig. 2 is a schematic view of the structure of the gas inlet end of the acetylene cutting torch shown in fig. 1.

Fig. 3 is a schematic view of the structure of the gas outlet end of the acetylene cutting torch shown in fig. 1.

Fig. 4 is a schematic view showing a structure of a reference example of the acetylene cutting torch shown in fig. 1.

Fig. 5 is a schematic structural view of another embodiment of the acetylene cutting nozzle of the present invention.

Fig. 6 is a schematic structural view of another embodiment of the acetylene cutting nozzle of the present invention.

In the figure, 100 outer nozzles, 110 connecting grooves, 200 inner nozzles, 210 oxygen flow mechanisms, 211 first oxygen flow channels, 212 second oxygen flow channels, 213 third oxygen flow channels, 220 connecting tables, 230 air grooves, 240 protrusions, 300 mixed air cavities, 400 air inlet ends, 410 air inlet mechanisms, 500 air outlet ends and 510 flaming mechanisms.

Detailed Description

Fig. 1 shows an embodiment of the acetylene cutting torch provided by the present invention, which comprises an outer torch 100 and an inner torch 200, wherein the outer torch 100 and the inner torch 200 are made of red copper, the inner torch 200 is sleeved in the outer torch 100, one end of the cutting torch is provided with an air inlet 400, and the other end is provided with an air outlet 500. The air intake end of the inner nozzle 200 has a cylindrical joint.

A mixing gas chamber 300 is provided between the inner nozzle 200 and the outer nozzle 100, and the specific shape thereof is, for example, that the outer nozzle 100 is a sleeve-shaped structure, the inner nozzle 200 is a long column shape, and the combination of the two forms an annular mixing gas chamber 300 therebetween. The air inlet end 400 is provided with an air inlet mechanism 410, the air inlet mechanism 410 is communicated with the air inlet end 400 and the mixed air cavity 300, the air outlet end 500 is provided with a flaming mechanism 510, and the flaming mechanism 510 is communicated with the mixed air cavity 300 and the air outlet end 500. The cutting torch further comprises an oxygen flow mechanism 210, wherein the oxygen flow mechanism 210 penetrates through the inner torch 200 and is communicated with the air inlet end 400 and the air outlet end 500.

The outer nozzle 100 and the inner nozzle 200 are respectively fitted at the inlet end 400 and the outlet end 500 to form a first sealed end and a second sealed end between which the mixing air chamber 300 is sealed. More specifically, in the acetylene cutting torch of the present invention, the first and second sealing ends between the outer nozzle 100 and the inner nozzle 200 are sealed except for the flaming mechanism 510. In a preferred embodiment, the two ends of the cutting tip are forged to make the first sealing end and the second sealing end closely contact with each other, so that the outer tip 100 and the inner tip 200 are integrated into a single structure.

The inner nozzle 200 is provided with a connecting platform 220 at the air inlet end 400, as shown in fig. 1, the connecting platform 220 is an annular step structure protruding outwards from the outer wall of the inner nozzle 200 and is used for being matched and connected with the end of the outer nozzle 100. Corresponding to the structure of the connection platform 220, the connection groove 110 is formed in the air inlet end 400 of the outer nozzle 100, the connection groove 110 is specifically an annular groove formed in the end of the outer nozzle 100, and the inner diameter of the connection groove 110 is slightly larger than the inner diameter of the middle of the inner nozzle 200, so that the lower end of the connection groove 110 has a tapered transition surface extending to the middle of the inner nozzle 200. When the inner nozzle 200 is sleeved in the outer nozzle 100, the connecting table 220 is embedded in the connecting groove 110, the connecting table 220 is in interference fit with the connecting groove 110 (wire passing, the size of the connecting table is only slightly larger than that of the connecting groove), and the connecting table 220 is tightly attached to the inner wall of the connecting groove 110 by extrusion and is tightly pressed to form a first sealing end; preferably, the depth of the connecting slot 110 is the same as the embedding depth of the connecting platform 220, so that the top and the bottom of the connecting slot 110 are connected with the outer wall of the connecting platform 220 after the two are combined; specifically, the top of the connecting groove 110 is connected with a step surface concavely formed by the connecting table 220, the bottom of the connecting groove 110 is abutted against the lower end surface of the connecting table 220, and a sealing opening is formed because the connecting groove 110 is a downward tapered transition surface with a reduced inner diameter. Through the matching connection of the connecting platform 220 and the connecting groove 110, the connection sealing performance of the inner nozzle 200 and the outer nozzle 100 is enhanced, and the structural strength of the air inlet end is increased.

The air intake mechanism 410 of the inner nozzle 200 penetrates the connecting table 220 to communicate with the air mixture chamber 300, and a plurality of air intake holes are uniformly distributed along the circumference of the connecting table 220, as shown in fig. 2. The number of the air intake holes is preferably set to 6. The outer wall of the inner nozzle 200 is optionally cut inwards to form a concave air groove 230 at a position below the connecting table 220 near the air inlet end of the inner nozzle 200, an annular groove is cut from the lower part of the connecting table 220, corresponds to the conical surface at the lower side of the connecting groove 110 and is communicated with the air inlet hole, and the beneficial effect is that the volume of the mixed air cavity is increased, and the uniform mixing of air is facilitated. However, the provision of the gas groove 230 reduces the material consumption of the inner nozzle, which reduces the weight of the cutting nozzle of the present invention relative to the cutting nozzle of the prior art, as shown in fig. 4 as a reference example. For guaranteeing the utility model discloses an equal product intensity can be maintained to the cutting torch to keep other cutting torches of current and the uniformity of cutting torch on matching degree, load, the downside of the gas tank 230 of interior mouth 200 is a protruding portion 240, and protruding portion 240 is located the middle section of interior mouth 200, and from the gas tank 230 lower extreme, through a conical surface transition, the external diameter progressively increases the cylindricality structure that forms. The other effect of above-mentioned structure is that, when gas reachs the gas mixture intracavity through air inlet mechanism, produce the disturbance effect through the protruding portion, aggravated the mixture of air current, make it through having reached the effect of further mixing gas simultaneously, improve the air feed quality of venthole.

The oxygen flow mechanism 210 is a flow channel penetrating through the inner nozzle 200, and is composed of a first oxygen flow channel 211, a tapered section and a second oxygen flow channel 212 in sequence from the gas inlet end 400 to the gas outlet end 500, the inner diameter of the first oxygen flow channel 211 is larger than that of the second oxygen flow channel 212, the first oxygen flow channel 211 is transitionally connected to the second oxygen flow channel 212 through the tapered section, and the second oxygen flow channel 212 is directly communicated with the gas outlet end.

The gas outlet end 500 of the cutting torch is formed with a plurality of uniformly distributed fire-ejecting holes to constitute a fire-ejecting mechanism 510, and the fire-ejecting holes are communicated with the mixed gas chamber 300. The flame-spraying hole is formed between the wall parts of the inner nozzle 200 and the outer nozzle 100 after the inner nozzle is forged at the gas outlet end 500 and is integrally formed, and the inner nozzle 200 and the outer nozzle 100 are combined into a second sealing end after the gas outlet end 500 is forged. The number of the flame ejection holes is preferably 6 as shown in fig. 3.

Fig. 5 shows another embodiment of the acetylene cutting torch provided by the present invention. The embodiment is different from the embodiment shown in fig. 1 in that the air inlet hole 410 of the air inlet mechanism obliquely penetrates the connection stage 220 and connects the air mixture chamber 330 on the lower side of the connection stage 220, and in order to increase the air mixture space of the air mixture chamber 330, the end of the inner nozzle 200 near the air outlet end 500 is lathed to have its outer wall recessed inward so as to increase the gap with the inner wall of the outer nozzle 100 for mixing air. In addition, preferably, the oxygen flow mechanism 210 in the inner nozzle 200 is formed by connecting a first oxygen flow channel 211, a second oxygen flow channel 212 and a third oxygen flow channel 213 from the air inlet end to the air outlet end in sequence, and the inner diameters of the first oxygen flow channel 211, the second oxygen flow channel 212 and the third oxygen flow channel 213 are reduced in sequence to adjust the flow rate of the oxygen flow therein, and the oxygen flow channels are connected in a transition manner by a conical section.

Fig. 6 shows another embodiment of the acetylene cutting torch provided by the present invention. This embodiment differs from the embodiment shown in fig. 1 in that the inner mouth 200 is configured as a joint platform at the air inlet end 400 and is embedded in the connecting groove 110 as a connecting step 220.

The production process of the acetylene cutting torch of the present invention is specifically described below by way of examples.

Example 1

The embodiment provides a production process of an acetylene cutting torch, which comprises the following steps:

(1) the method comprises the following steps of (1) respectively manufacturing an outer nozzle prefabricated member and an inner nozzle prefabricated member by using a cold header according to a set external dimension and shape by taking a red copper bar as a raw material, wherein the outer nozzle prefabricated member forms a connecting table after being subjected to cold heading, and the outer nozzle prefabricated member forms a sleeve structure with a connecting groove after being subjected to cold heading;

(2) further processing the inner nozzle prefabricated part, punching the center of the inner nozzle prefabricated part to obtain an oxygen flow mechanism, uniformly punching air inlet holes at the air inlet end of the inner nozzle, and cutting an air outlet groove inwards along the outer wall of the inner nozzle to be communicated with the air inlet holes;

(3) sleeving the processed inner nozzle prefabricated part into the outer nozzle prefabricated part, embedding the connecting table into the connecting groove, and punching the connecting table into the connecting groove in an interference manner through punching processing to form a whole so as to form a first sealing end;

(4) penetrating a steel wire into the air outlet end along the space between the inner nozzle prefabricated member and the outer nozzle prefabricated member according to the specification of the cutting nozzle, penetrating the steel wire into a channel opening of the oxygen flow mechanism according to a set specification, then, combining the outer nozzle prefabricated member and the inner nozzle prefabricated member into a whole at the air outlet end through forging and pressing to form a second sealing end, forming a mixed air cavity in the two sealing ends, penetrating the steel wire to form a fire spraying hole, and then, pulling out the steel wire to obtain a primary finished product of the cutting nozzle;

(5) performing metalworking on the primary finished product of the cutting nozzle according to the product requirement, wherein the metalworking comprises flat head, chamfering, cylindrical turning and angle turning;

(6) and (4) polishing the outer surface, cleaning and air-drying to finally obtain the cutting nozzle.

Example 2

(2) further processing the inner nozzle prefabricated member, punching the center of the inner nozzle prefabricated member to obtain an oxygen flow mechanism, uniformly punching 6 air inlet holes at the air inlet end of the inner nozzle to penetrate through the connecting table, cutting an air groove inwards along the outer wall of the inner nozzle under the connecting table to be communicated with the air inlet holes, uniformly milling 6 long grooves along the outer wall of the air outlet end in the circumferential direction, wherein the aperture of each long groove is larger than that of a set fire spraying hole;

(3) sleeving the processed inner nozzle prefabricated part into the outer nozzle prefabricated part, embedding the connecting table into the connecting groove in an interference manner, and then punching along the axial direction to integrate the connecting table and the connecting groove into a whole to form a first sealing end;

(4) selecting a steel wire according to the specification of a cutting torch nozzle, penetrating the steel wire from an air outlet end along a hole of an elongated slot and a channel opening of an oxygen flow mechanism in the middle, combining an outer nozzle prefabricated member and an inner nozzle prefabricated member into a whole at the air outlet end through forging and pressing to form a second sealing end, forming a mixed air cavity in the two sealing ends, deforming and reducing the aperture of 6 elongated slots to the size of the steel wire to form 6 flame spraying holes, and then pulling out the steel wire to obtain a primary finished product of the cutting torch;

(5) according to the requirements of products, further finish machining such as flat head, chamfering, turning the outer circle, turning the angle and the like is carried out on the primary finished product of the cutting torch;

Example 3

(1) the method comprises the following steps of (1) respectively manufacturing a red copper bar into an outer nozzle prefabricated member and an inner nozzle prefabricated member by using a cold header according to a set external dimension and shape, wherein the outer nozzle prefabricated member is subjected to cold heading to form a connecting table, the outer nozzle prefabricated member is subjected to cold heading to form a sleeve structure with a connecting groove, 6 long grooves are milled at the air outlet end of the outer nozzle prefabricated member along the inner wall of the outer nozzle prefabricated member in the circumferential direction, and the aperture of each long groove is larger than that of a set flame spraying hole;

(4) selecting a steel wire according to the specification of a cutting nozzle, inserting the steel wire into a gap of a long groove which is pre-manufactured along the inner wall of an outer nozzle from an air outlet end and a channel opening of an oxygen flow mechanism in the middle, then, combining the outer nozzle prefabricated member and the inner nozzle prefabricated member into a whole at the air outlet end through forging and pressing to form a second sealing end, forming a mixed air cavity in the two sealing ends, deforming and reducing the aperture of the long groove to the size of the steel wire to form a fire spraying hole, and then, pulling out the steel wire to obtain a primary finished product of the cutting nozzle;

Comparative example

The production process of the common integrated acetylene cutting nozzle comprises the following steps:

(1) cutting a blank according to the material consumption of a product by taking a red copper bar as a raw material, and marking the position of a mixed gas channel on one end face of the red copper bar; (2) punching the blank by a punching machine to obtain a mixed gas channel which is uniformly distributed in the circumferential direction, wherein the mixed gas channel penetrates through two ends of the blank to form an air inlet hole and a fire spraying hole;

(3) carrying out rough heading on the blank, and preliminarily processing a structure of the air inlet end, such as a joint;

(4) primarily turning the blank, flattening two ends of the blank, and cutting the outer wall of the blank to form a long column shape;

(5) sequentially punching central holes at the air inlet end and the air outlet end of the blank, and forming a channel of the oxygen flow mechanism after the holes at the two ends are communicated;

(6) inserting a steel wire into the initially punched flame-throwing hole, stretching the air outlet end by finish forging to reduce the flame-throwing hole, pulling out the steel wire, repeating the operation to gradually reduce the flame-throwing hole, selecting the steel wire to insert according to the specification of the cutting torch mouth, pulling out the steel wire after the processed flame-throwing hole reaches the aperture required by the specification, and obtaining a cutting torch preform;

(7) the two ends of the cutting nozzle preform are flat-headed, finish turning is carried out to ensure that the cutting nozzle preform reaches the outer diameter required by the product, and metalworking such as chamfering, turning outer circle, turning angle and the like is carried out;

(8) and (4) polishing the outer surface, cleaning and air-drying to finally obtain the cutting nozzle.

And (3) product performance test:

1. resistance to tempering test

According to the specification of the 6.1.4 tempering resistance test in JB/T6970-. The end face of the cutting nozzle is parallel to the surface of the copper plate with the groove, and the distance between the cutting nozzle and the copper plate is 1.5 mm. Igniting the cutting torch, adjusting to a neutral flame in a standard state after ignition, placing the cutting torch above a rotating copper plate after 30s, wherein the rotating speed of the copper plate is 10r/min, the test radius is 165mm, the flame is not allowed to be adjusted in the test process, and the cutting torch rotates for 5 circles in each test. After the cutting torch is subjected to the test, no continuous tempering phenomenon occurs, and the test is qualified.

The products obtained according to the production process of the examples were subjected to a temper resistance test and the yield was recorded.

2. Flame stability test

According to the test specification of 6.2.6 in JB/T7950-2014. The cutting torch with the cutting nozzle is ignited and adjusted to be neutral flame, after the neutral flame is stabilized for 30s, the flame is perpendicular to the wind direction and is placed at the position with the wind speed of 10m/s, according to the test standard of 10s, the flame core of the cutting torch can normally burn at the wind speed, and the phenomena of fire extinguishing and tempering do not occur.

The product obtained according to the production process of each example was subjected to a flame stability test and the yield was recorded.

3. Combustion flame shape observation

According to the part of test 2, the cutting torch equipped with the cutting nozzle was ignited and adjusted to a neutral flame, and after stabilization for 30 seconds, the flame shape was observed to be uniform, and the cutting oxygen flow should be located in the center of the flame, and be straight, clear, and powerful.

4. Raw material loss statistics

The structure of fig. 1 was used to manufacture an acetylene cutting torch, and the weight of red copper raw material required for a single product was calculated by statistically comparing the amounts of raw materials used in the manufacturing processes of the respective examples and comparative examples.

Evaluation results of the examples:

the evaluation results of the performance tests of the above examples and comparative examples are shown in the following table:

as can be seen from the test results, the acetylene cutting torch produced by the novel process has the working performance equivalent to that of the traditional acetylene cutting torch; compared with the traditional process of the comparative example, the utility model has the advantages of the material of throwing reduces by a wide margin and is showing, has reduced about 40% material cost. In addition, because the processing step is simple, the utility model discloses an acetylene cutting torch's process velocity is about 40% faster than traditional handicraft, has saved a large amount of manpowers, reduces about 20% of labour cost, consequently has extensive application prospect.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. An acetylene cutting torch is characterized in that one end of the cutting torch is provided with an air inlet end, the other end of the cutting torch is provided with an air outlet end, the air inlet end is provided with an air inlet mechanism, the air outlet end is provided with a flaming mechanism, the cutting torch further comprises an oxygen flow mechanism, and the oxygen flow mechanism is communicated with the air inlet end and the air outlet end; it is characterized in that the preparation method is characterized in that,

the acetylene cutting nozzle comprises an outer nozzle and an inner nozzle, the inner nozzle is sleeved in the outer nozzle, a mixed gas cavity is arranged between the inner nozzle and the outer nozzle, and the mixed gas cavity is communicated with the gas inlet mechanism and the flame spraying mechanism;

the oxygen flow mechanism is penetratingly arranged in the inner nozzle;

outer mouth and interior mouth cooperation back have formed first sealed end and the sealed end of second, and the mechanism that spouts a fire sets up in the sealed end department of second.

2. The acetylene cutting head according to claim 1, wherein the outer head and the inner head are made of red copper.

3. The acetylene cutting head as claimed in claim 1, wherein the inner head is recessed near the gas inlet end to form a gas groove, the gas groove is communicated with the gas inlet mechanism, and the lower side of the gas groove is provided with a protrusion.

4. The acetylene cutting torch according to claim 1 wherein the outer torch is provided with a connecting slot at the inlet end, the inner torch is provided with a connecting table at the inlet end, the connecting slot is matched with the connecting table, and the connecting table is embedded in the connecting slot to form the first sealed end.

5. The acetylene cutting head according to claim 1, wherein the oxygen flow mechanism is composed of a plurality of segments of oxygen flow channels in sequence from the gas inlet end to the gas outlet end, and the inner diameter of each oxygen flow channel decreases in sequence from the gas inlet end to the gas outlet end.

6. The acetylene cutting torch according to claim 1 wherein the flame projecting mechanism comprises a plurality of flame projecting holes uniformly distributed, the flame projecting holes communicating with the mixed gas chamber.

7. The acetylene cutting head according to claim 6, wherein the flaming holes are formed by threading steel wires into milled grooves formed in the outer wall of the inner head and then forging the steel wires.

8. The acetylene cutting head of claim 7, wherein the milled grooves are milled into the outer wall of the inner head or are formed by drilling holes into the second sealed end.