CN209944328U - Cutting torch for injection-suction machine - Google Patents
Cutting torch for injection-suction machine Download PDFInfo
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- CN209944328U CN209944328U CN201920483171.2U CN201920483171U CN209944328U CN 209944328 U CN209944328 U CN 209944328U CN 201920483171 U CN201920483171 U CN 201920483171U CN 209944328 U CN209944328 U CN 209944328U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses a jet-suction type cutting torch for machine, it includes the cutting torch main part, be provided with the gas pipeline in the cutting torch main part, preheat the oxygen pipeline, cutting oxygen pipeline and hybrid chamber, preheat the oxygen pipeline and mix in the hybrid chamber with the gas pipeline, preheat the oxygen pipeline and drawn forth an auxiliary branch road, inwards seted up the valve body passageway from the surface in the cutting torch main part, the head end of valve body passageway sets up to binding off toper and awl point intercommunication to cutting oxygen pipeline, the lateral wall switch-on of auxiliary branch road and valve body passageway, be provided with cutting torch protection valve in the valve body passageway, the toper head end that the valve body passageway was plugged up to the head of cutting torch protection valve forms sealedly, its afterbody forms sealedly with the passway of valve body passageway, a little strand of preheating oxygen of preheating the oxygen pipeline gets into cutting oxygen. The preheating oxygen and the fuel gas in the cutting torch are fully mixed, the combustion rate is high, and a small strand of preheating oxygen is introduced into the cutting oxygen pipeline, so that the phenomenon that sundries block a cutting oxygen channel is avoided, and the defect that the injection type cutting torch has the tempering problem is overcome.
Description
Technical Field
The utility model relates to a metal cutting welding technology field especially relates to a formula is shot and is inhaled cutting torch for machine.
Background
The cutting torch is a main tool for gas cutting, and has the functions of mixing combustible gas and oxygen inside to form a preheating flame with certain heat energy and shape, and jetting high-pressure oxygen flow at the center of the preheating flame to perform gas cutting.
For the cutting torch for machine, in order to facilitate the mechanical control, the equal-pressure cutting torch is generally adopted, the equal-pressure cutting torch refers to a cutting torch in which gas is conveyed into a cutting nozzle through respective gas conveying pipes by virtue of the pressure of the gas and preheating oxygen, the structure requires that the gas pressure is equivalent to the preheating oxygen, however, in the actual use process, the gas pressure is smaller than the pressure of the preheating oxygen and pressure difference exists, so that the flow of the gas is relatively small, the conditions of insufficient mixing of the gas and the preheating oxygen and low gas utilization rate occur, and the cutting is influenced.
The principle of the jet-suction type cutting torch is that the preheated oxygen is sprayed at a high speed to generate negative pressure, the fuel gas is sucked into the jet suction pipe to mix the fuel gas and the oxygen, and the mixed gas flows through a longer channel, so that the flow rate and the pressure of the preheated oxygen and the fuel gas tend to be consistent, the fuel gas and the oxygen are fully mixed, and the combustion rate of the fuel gas is improved. However, the jet-suction type cutting torch has the disadvantages of complicated structure, easy tempering phenomenon, low safety relative to the equal-pressure type cutting torch and short service life of the cutting nozzle. Therefore, the injection-suction type structure is not common abroad generally and is also widely used for manual cutting torches at home.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a penetrate and inhale formula cutting torch for machine, to above-mentioned problem, solve current isobaric cutting torch burning oxygen and mix the problem that the tempering easily takes place for traditional penetrating and inhaling formula cutting torch.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a cutting torch for injection-suction machine comprises a cutting torch body, wherein one end of the cutting torch body is provided with three pipeline joints, the other end of the cutting torch body is led with a mixed gas channel and a cutting oxygen channel, a gas pipeline, a preheating oxygen pipeline, a cutting oxygen pipeline and a mixing cavity are arranged in the cutting torch body, the three pipelines are respectively correspondingly communicated with the three pipeline joints, the bottom of the mixing cavity is closed and communicated with the mixed gas channel, the cutting oxygen pipeline is communicated with the cutting oxygen channel, an injection pipe and a flow guide column are arranged in the mixing cavity, the outer wall of the flow guide column is sealed by being attached to the side wall of the mixing cavity, a first fluid channel is arranged in the flow guide column, one end opening of the first fluid channel is positioned at the head end of the flow guide column, the other end opening is positioned on the side face of the flow guide column, the preheating oxygen pipeline is communicated with the side face opening of the first fluid channel, the injection pipe is, a first central flow passage opening at one end of the injection suction pipe is communicated with a head end opening of the first fluid passage in a sealing way, the other end of the injection suction pipe is provided with a conical head, the gas pipeline is communicated with the first fluid gap, an auxiliary branch is led out from the preheating oxygen pipeline, a valve body passage is arranged on the cutting torch main body from the outer surface to the inside, the head end of the valve body passage is provided with a closing-up cone and a conical tip is communicated with the cutting oxygen pipeline, the auxiliary branch is communicated with the side wall of the valve body passage, a cutting nozzle protection valve is arranged in the valve body passage, and the head of the cutting nozzle protection valve blocks the conical, the tail part of the cutting torch is sealed with a channel opening of the valve body channel, a second fluid gap is formed between the middle part of the cutting torch and the side wall of the valve body channel, the cutting torch protection valve is internally provided with a second fluid channel, one end opening of the second fluid channel is positioned at the top end of the head part of the cutting torch protection valve, and the other end opening is positioned on the surface of the middle part of the cutting torch protection valve.
Wherein, still include barrel and cutting torch subassembly, the barrel cover is located outside mist passageway, the cutting oxygen passageway, and its one end connection cutting torch main part, and the cutting torch subassembly is connected to the other end, thereby mist passageway extends to cutting torch subassembly department and spouts the required gas of burning and the mist of oxygen, thereby cutting oxygen passageway extends to cutting torch subassembly department and spouts the required high pressure oxygen of gas cutting.
The cutting torch assembly comprises a cutting torch head, a cutting torch sleeve and a cutting torch seat, the cutting torch head and the cutting torch sleeve are connected to the cutting torch seat in a threaded mode, the cutting torch sleeve is sleeved outside the cutting torch head in a clearance mode, a third fluid gap is formed between the cutting torch head and the cutting torch sleeve, a second central flow channel is formed in the cutting torch head, the mixed gas channel is connected to the cutting torch seat and communicated with the third fluid gap, and the cutting oxygen channel is connected to the cutting torch seat and communicated with the second central flow channel.
Wherein, the outer wall of the gun barrel is provided with a rack.
Wherein, all be provided with the pneumatic valve on the three pipeline joint, the pneumatic valve includes valve body and valve rod, be provided with in the valve body and block the chamber, it has two water conservancy diversion passageways outwards to block the chamber, two water conservancy diversion passageways form two flow path holes on blocking the wall in chamber, the valve rod stretches into and blocks in the chamber, it is provided with the stroke screw thread on blocking the wall in chamber, it is provided with the external screw thread to correspond the stroke screw thread on the valve rod, spherical groove has been seted up to the head end of valve rod, the embedding has the sealed steel ball that can free rotation in the spherical groove, the diameter of sealed steel ball is greater than the bore of flow path hole, thereby compress tightly and form sealedly.
Wherein, block the chamber opening and form connection port on the valve body, wear to be equipped with gland nut on the valve rod, gland nut and connection port threaded connection, still the cover is equipped with first packing ring and second packing ring on the valve rod, press from both sides between first packing ring and the second packing ring and be equipped with the polytetrafluoroethylene sealing ring, spacing recess has been seted up on the connection port, first packing ring, the outside of second packing ring corresponds spacingly by spacing recess and gland nut respectively, and the outer lane of polytetrafluoroethylene sealing ring closely pastes with the lateral wall of spacing recess and leans on, the inner circle closely pastes with the surface of valve rod and leans on.
The flow channel hole at the inlet side is positioned at the bottom of the blocking cavity, and is positioned on the same axis with the valve rod and the sealing steel ball, the flow channel hole at the outlet side is positioned on the side wall of the blocking cavity, and the tail end of the valve rod is provided with an adjusting hand wheel.
Wherein, the head end of the valve body channel is set to be conical, and the head of the cutting torch protection valve is set to be hemispherical.
Wherein, the aperture of the opening at the top end of the head part of the cutting nozzle protection valve is 0.1 mm.
Wherein, the cutting torch protection valve is connected with the cutting torch main body by screw thread.
To sum up, the beneficial effects of the utility model are that, compared with the prior art, the formula is inhaled with the cutting torch to the injection formula adopts the injection principle, will preheat oxygen and jet out at a high speed and form the negative pressure to the hybrid chamber, thereby the gas is inhaled, through longer mist passageway, the velocity of flow and the pressure of preheating oxygen and gas tend to unanimity, so that both intensive mixing, the combustion rate of gas is improved, in addition, in preheating the stage with a little burst of preheating oxygen introduction cutting oxygen pipeline, this burst of preheating oxygen is when combustion-supporting preheating flame, the debris cutting torch cutting oxygen passageway has been avoided plugging up, and the cutting oxygen passageway has microthermal preheating oxygen cooling, the cutting torch has effectively been protected, service life is prolonged, overcome and the formula of the injection has the defect of tempering problem.
Drawings
Fig. 1 is a schematic overall structure diagram of a cutting torch for an injection and suction machine according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of a cutting torch for an injection-suction machine according to an embodiment of the present invention;
fig. 3 is a first schematic cross-sectional view of a cutting torch body of a cutting torch for an injector-suction machine according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional view of a cutting torch body of a cutting torch for an injector-suction machine according to an embodiment of the present invention;
fig. 5 is an exploded view of the gas valve of the cutting torch for the jet-suction machine according to the embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of a gas valve of a cutting torch for an injector-type machine according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Referring to fig. 1-6, the present embodiment provides a torch for a jet-type machine, which includes a torch body 1, a barrel 19, and a cutting tip assembly.
The one end of cutting torch main part 1 is provided with three pipeline joint 2, and the other end has drawn forth mixed gas passageway 3 and cutting oxygen passageway 4, is provided with gas pipeline 5, preheating oxygen pipeline 6, cutting oxygen pipeline 7 and hybrid chamber 8 in the cutting torch main part 1, and three pipeline corresponds the intercommunication with three pipeline joint 2 respectively, and the bottom binding off of hybrid chamber 8 communicates with mixed gas passageway 3, and cutting oxygen pipeline 7 communicates with cutting oxygen passageway 4.
The mixing cavity 8 is internally provided with an injection pipe 9 and a flow guide column 10, the outer wall of the flow guide column 10 is attached to and sealed with the side wall of the mixing cavity 8, a first fluid channel 11 is arranged in the flow guide column 10, one end opening of the first fluid channel 11 is positioned at the head end of the flow guide column 10, the other end opening is positioned on the side surface of the flow guide column 10, the preheating oxygen pipeline 6 is communicated with the side opening of the first fluid channel 11, the injection pipe 9 is provided with a first central flow passage 12, a first fluid gap 13 is arranged between the outer wall of the first fluid channel 11 and the side wall of the mixing cavity 8, the opening of the first central flow passage 12 at one end of the injection pipe 9 is communicated with the head end opening of the first fluid channel 11 in a sealing manner, the other end of the injection pipe 9 is set to.
High-pressure preheated oxygen is ejected at high speed through the nozzle of the injection suction pipe 9 to form a low-pressure area in the mixing cavity 8, and fuel gas is continuously sucked under the action of air pressure, so that the flow speed is accelerated, the problem of pressure difference between the high-pressure preheated oxygen and the fuel gas is solved, and the mixing is more sufficient.
An auxiliary branch 14 is led out from the preheating oxygen pipeline 6, a valve body channel 15 is arranged on the cutting torch body 1 from the outer surface to the inner part, the head end of the valve body channel 15 is set to be in a closing conical shape, preferably in a conical shape, the cone tip is communicated with the cutting oxygen pipeline 7, the auxiliary branch 14 is communicated with the side wall of the valve body channel 15, a cutting torch protective valve 16 is arranged in the valve body channel 15, the cutting torch protective valve 16 is arranged outside the cutting torch main body 1, is connected with the cutting torch body 1 by screw thread, the head of the cutting torch protective valve 16 blocks the conical head end of the valve body channel 15 to form sealing, the tail part of the cutting torch is sealed with a passage port of the valve body passage 15, a second fluid gap 17 is formed between the middle part of the cutting torch and the side wall of the valve body passage 15, a second fluid passage 18 is arranged in the cutting torch protection valve 16, one end opening of the second fluid passage 18 is positioned at the top end of the head part of the cutting torch protection valve 16, and the other end opening is positioned on the surface of the middle part of the cutting torch protection valve 16. One strand of the preheated oxygen in the preheated oxygen pipeline 6 sequentially passes through the auxiliary branch 14, the second fluid gap 17 and the second fluid channel 18 to be merged into the cutting oxygen pipeline 7, and finally flows out of the cutting oxygen channel 4.
The opening diameter of the head top end of the cutting torch protection valve 16 is preferably 10 filaments, that is, 0.1mm, and a stable flow rate is maintained, so that the original supply of the preheated oxygen is ensured, and the jet of the cutting oxygen is not influenced.
The gun tube 19 is covered outside the mixed gas channel 3 and the cutting oxygen channel 4, one end of the gun tube 19 is connected with the cutting torch body 1, the other end of the gun tube is connected with the cutting nozzle component, and a rack 20 is arranged on the outer wall of the gun tube 19. The mixed gas channel 3 extends to the cutting nozzle assembly to spray the mixed gas of fuel gas and oxygen required by combustion, and the cutting oxygen channel 4 extends to the cutting nozzle assembly to spray high-pressure oxygen required by gas cutting.
The cutting torch component comprises a cutting torch head 21, a cutting torch sleeve 22 and a cutting torch seat 23, the cutting torch head 21 and the cutting torch sleeve 22 are connected to the cutting torch seat 23 through threads, the cutting torch sleeve 22 is sleeved outside the cutting torch head 21 in a clearance mode, a third fluid clearance 24 is formed between the cutting torch head 21 and the cutting torch sleeve 22, a second central flow passage 25 is formed in the cutting torch head 21, the mixed gas passage 3 is connected to the cutting torch seat 23 and communicated with the third fluid clearance 24, and the cutting oxygen passage 4 is connected to the cutting torch seat 23 and communicated with the second central flow passage 25.
In addition, in order to realize accurate control of three gases, namely fuel gas, preheated oxygen and cutting oxygen, the three pipeline joints 2 are all provided with air valves 26, each air valve 26 comprises a valve body 27 and a valve rod 28, a blocking cavity 29 is arranged in each valve body 27, two guide channels 30 are led out from the blocking cavity 29, the two guide channels 30 form two flow channel holes on the wall of the blocking cavity 29, each valve rod 28 extends into the blocking cavity 29, the wall of the blocking cavity 29 is provided with a stroke thread, the valve rod 28 is provided with an external thread corresponding to the stroke thread, the head end of each valve rod 28 is provided with a spherical groove, sealing steel balls 31 capable of freely rotating are embedded into the spherical grooves, the diameter of each sealing steel ball 31 is larger than the caliber of each flow channel hole, and therefore the sealing is formed on the flow channel holes. The flow passage hole at the inlet side is positioned at the bottom of the blocking cavity 29 and is positioned on the same axis with the valve rod 28 and the sealing steel ball 31, the flow passage hole at the outlet side is positioned on the side wall of the blocking cavity 29, and the tail end of the valve rod 28 is provided with an adjusting hand wheel 32.
Block the cavity 29 opening and form the connection port on valve body 27, wear to be equipped with gland nut 33 on the valve rod 28, gland nut 33 and connection port threaded connection, still the cover is equipped with first packing ring 34 and second packing ring 35 on the valve rod 28, press from both sides between first packing ring 34 and the second packing ring 35 and be equipped with polytetrafluoroethylene sealing ring 36, the spacing recess has been seted up on the connection port, the outside of first packing ring 34, second packing ring 35 corresponds spacing by spacing recess and gland nut 33 respectively, and the outer lane of polytetrafluoroethylene sealing ring 36 closely pastes with the lateral wall of spacing recess, the inner circle closely pastes with the surface of valve rod 28 and leans on. Wherein, polytetrafluoroethylene sealing ring 36 adopts 360 sealed of portable face nature, and the gas tightness is strong.
In addition, a small strand of preheating oxygen is introduced into a cutting oxygen pipeline in the preheating stage, and the strand of preheating oxygen assists in supporting combustion and preheating flame, prevents sundries from blocking a cutting oxygen channel of the cutting nozzle, cools the cutting oxygen channel by low-temperature preheating oxygen, effectively protects the cutting nozzle, prolongs the service life, and overcomes the defect that the injection type cutting torch has the tempering problem.
The above embodiments have been merely illustrative of the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and does not depart from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A cutting torch for an injection-type machine is characterized by comprising a cutting torch main body, wherein one end of the cutting torch main body is provided with three pipeline joints, the other end of the cutting torch main body is led out with a mixed gas channel and a cutting oxygen channel, a gas pipeline, a preheating oxygen pipeline, a cutting oxygen pipeline and a mixing cavity are arranged in the cutting torch main body, the three pipelines are respectively correspondingly communicated with the three pipeline joints, the bottom of the mixing cavity is closed and communicated with the mixed gas channel, the cutting oxygen pipeline is communicated with the cutting oxygen channel,
the mixing cavity is internally provided with an injection pipe and a flow guide column, the outer wall of the flow guide column is sealed by being attached to the side wall of the mixing cavity, a first fluid channel is arranged in the flow guide column, one end opening of the first fluid channel is positioned at the head end of the flow guide column, the other end opening is positioned on the side surface of the flow guide column, the preheating oxygen pipeline is communicated with the side opening of the first fluid channel, the injection pipe is provided with a first central flow channel, a first fluid gap exists between the outer wall of the injection pipe and the side wall of the mixing cavity, the first central flow channel opening at one end of the injection pipe is communicated with the head end opening of the first fluid channel in a sealing way, the other end of the injection pipe is provided with a conical head, and the gas pipeline is communicated with the first fluid gap,
an auxiliary branch is led out from the preheating oxygen pipeline, a valve body channel is arranged on the cutting torch main body from the outer surface inwards, the head end of the valve body channel is in a closing conical shape, a conical tip is communicated with the cutting oxygen pipeline, the auxiliary branch is communicated with the side wall of the valve body channel, a cutting torch protection valve is arranged in the valve body channel, the head of the cutting torch protection valve is blocked by the conical head end of the valve body channel to form sealing, the tail of the cutting torch protection valve is sealed with a channel opening of the valve body channel, a second fluid gap is formed between the middle of the cutting torch protection valve and the side wall of the valve body channel, a second fluid channel is arranged in the cutting torch protection valve, an opening at one end of the second fluid channel is located at the top end of the head of the cutting torch protection valve, and an opening at the.
2. The cutting torch for a jet-suction machine according to claim 1, wherein: still include barrel and cutting torch subassembly, the barrel casing is located outside mist passageway, the cutting oxygen passageway, and its one end is connected the cutting torch main part, the other end is connected the cutting torch subassembly, thereby mist passageway extends to thereby the required gas of blowout burning and the mist of oxygen of cutting torch subassembly department, thereby the cutting oxygen passageway extends to thereby the required high pressure oxygen of blowout gas cutting of cutting torch subassembly department.
3. The cutting torch for a jet-suction machine according to claim 2, wherein: the cutting torch component comprises a cutting torch head, a cutting torch sleeve and a cutting torch seat, wherein the cutting torch head and the cutting torch sleeve are in threaded connection with the cutting torch seat, the cutting torch sleeve is sleeved outside the cutting torch head in a clearance mode, a third fluid gap is formed between the cutting torch head and the cutting torch sleeve, a second central flow channel is formed in the cutting torch head, the mixed gas channel is connected to the cutting torch seat and communicated with the third fluid gap, and the cutting oxygen channel is connected to the cutting torch seat and communicated with the second central flow channel.
4. The cutting torch for a jet-suction machine according to claim 2, wherein: and a rack is arranged on the outer wall of the gun barrel.
5. The cutting torch for a jet-suction machine according to claim 1, wherein: the three pipeline connector is provided with an air valve, the air valve comprises a valve body and a valve rod, a blocking cavity is arranged in the valve body, two flow guide channels are outwards led out from the blocking cavity, the two flow guide channels form two flow channel holes on the wall of the blocking cavity, the valve rod stretches into the blocking cavity, a stroke thread is arranged on the wall of the blocking cavity, the valve rod corresponds to the stroke thread, an external thread is arranged on the stroke thread, a spherical groove is formed in the head end of the valve rod, a sealing steel ball capable of rotating freely is embedded into the spherical groove, and the diameter of the sealing steel ball is larger than the caliber of the flow channel hole, so that the sealing is formed on the flow channel hole in a pressing mode.
6. The cutting torch for a jet-suction machine according to claim 5, wherein: block the chamber opening and in form connection port on the valve body, wear to be equipped with gland nut on the valve rod, gland nut with connection port threaded connection, it is equipped with first packing ring and second packing ring still to overlap on the valve rod, first packing ring with press from both sides between the second packing ring and be equipped with the polytetrafluoroethylene sealing ring, spacing recess has been seted up on the connection port, the outside of first packing ring, second packing ring respectively by spacing recess with gland nut corresponds spacingly, just the outer lane of polytetrafluoroethylene sealing ring with the lateral wall of spacing recess closely pastes and leans on, the inner circle with the surface of valve rod closely pastes and leans on.
7. The cutting torch for a jet-suction machine according to claim 5, wherein: the runner hole of the inlet side is positioned at the bottom of the blocking cavity and is positioned on the same axis with the valve rod and the sealing steel ball, the runner hole of the outlet side is positioned on the side wall of the blocking cavity, and the tail end of the valve rod is provided with an adjusting hand wheel.
8. The cutting torch for a jet-suction machine according to claim 1, wherein: the head end of the valve body channel is set to be conical, and the head of the cutting torch protection valve is hemispherical.
9. The cutting torch for a jet-suction machine according to claim 1, wherein: the aperture of the opening at the top end of the head part of the cutting nozzle protection valve is 0.1 mm.
10. The cutting torch for a jet-suction machine according to claim 1, wherein: the cutting torch protection valve is in threaded connection with the cutting torch main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920483171.2U CN209944328U (en) | 2019-04-10 | 2019-04-10 | Cutting torch for injection-suction machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920483171.2U CN209944328U (en) | 2019-04-10 | 2019-04-10 | Cutting torch for injection-suction machine |
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| CN209944328U true CN209944328U (en) | 2020-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109855097A (en) * | 2019-04-10 | 2019-06-07 | 无锡翔征焊割机械有限公司 | A kind of jet absorption type machine cutting torch |
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2019
- 2019-04-10 CN CN201920483171.2U patent/CN209944328U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109855097A (en) * | 2019-04-10 | 2019-06-07 | 无锡翔征焊割机械有限公司 | A kind of jet absorption type machine cutting torch |
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