Novel anti-tempering welding and cutting torch

Abstract

The utility model relates to the technical field of machinery, and discloses a novel anti-backfire welding and cutting torch which comprises a pressure reducing pipe, one end of the pressure reducing pipe is fixedly connected with one end of a connecting pipe, the other end of the connecting pipe is fixedly connected with a cutting nozzle, the other end of the pressure reducing pipe is fixedly connected with a gas conveying pipe, and the gas conveying pipe is fixedly connected with a gas inlet pipe. A control valve is fixedly installed on the surface of the gas conveying pipe, and an anti-backfire mechanism is arranged in the pressure reducing pipe. According to the novel anti-backfire welding and cutting torch, when the backfire phenomenon occurs, high-temperature gas impacts the interior of the pressure reducing pipe along the gas outlet hole, so that the ball body moves to block the pipe opening of the gas conveying pipe, flame retrogradation is prevented, meanwhile, due to the fact that the gas pressure of the high-temperature gas in the pressure reducing pipe is increased, the disc moves towards the interior of the pressure dividing pipeline, and the backfire phenomenon is prevented. And a trapezoidal block on a hollow rod is moved, gas is discharged from the interior of a pressure dividing hole, pressure relief is conducted on the internal gas, and damage to an internal mechanism is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of machinery, in particular to a novel anti-backfire welding cutting torch. Background Art

[0002] Welding and cutting is a metal machining process that requires the help of welding and cutting equipment. The suction welding and cutting torch is one of the main equipment commonly used by people. It is generally composed of oxygen pipe, mixed gas pipe, cutting oxygen regulating valve, preheating oxygen regulating valve, oxygen valve, gas valve, handle, gas guide pipe, cutting nozzle, middle body and rear body. In normal operation, the gas flame burns outside the cutting nozzle. When the gas pressure is insufficient, the welding nozzle is blocked, the welding nozzle is too close to the weldment or the welding nozzle is overheated, the gas flame will enter the nozzle and burn in reverse, resulting in flashback.

[0003] According to a new type of anti-flashback welding and cutting torch (publication number: CN 103047650 B) disclosed in the above application, the jet-suction type is combined with the setting of the fire-blocking section, the structure is simple and ingenious, so that the flashback phenomenon can be easily eliminated in the tube soon after passing through the cutting nozzle, the anti-flashback function is stable and effective, and the overall structural design does not change the original classic welding and cutting torch appearance.

[0004] However, in actual use of the above equipment, the effect of reducing the inner diameter of the fire-blocking section set by the mechanism to prevent flashback is not very good. The reduction in inner diameter may not completely reduce the possibility of flashback, and the flame may burn back along the gas and cause an explosion. In view of this, we propose a new type of anti-flashback welding and cutting torch. Summary of the invention

[0005] The utility model aims to provide a novel anti-backfire welding cutting torch to solve the problems raised in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical solutions: a novel anti-flashback welding and cutting torch, comprising a pressure reducing tube, one end of which is fixedly connected to one end of a connecting tube, the other end of which is fixedly connected to a cutting nozzle, the other end of which is fixedly connected to a gas pipeline, a control valve is fixedly installed on the surface of the gas pipeline, an anti-flashback mechanism is arranged inside the pressure reducing tube, a protective mechanism is arranged inside the pressure reducing tube, and the anti-flashback mechanism comprises:

[0007] An air outlet pipe, one end of the connecting pipe close to the pressure reducing pipe is fixedly connected to the air outlet pipe, an air outlet hole is opened on the surface of the air outlet pipe, the surface of the air outlet pipe is fixedly connected to a limiting sleeve, a cavity is arranged inside the air outlet pipe, a fixing rod is fixedly installed inside the cavity, one end of the air outlet pipe is fixedly connected to one end of a telescopic spring, the other end of the telescopic spring is fixedly connected to a sphere, a pressure dividing pipe is opened on the inner wall of the pressure reducing pipe, the inner wall of the pressure reducing pipe is slidably connected to a disc, the lower surface of the disc is fixedly connected to one end of a reset spring, the other end of the reset spring is fixedly connected to the inner wall of the pressure dividing pipe, the upper surface of the disc is fixedly connected to a hollow rod, and the upper surface of the hollow rod is fixedly connected to a trapezoidal block.

[0008] Preferably, the protective mechanism includes a pressure dividing hole, the inner wall of the pressure reducing tube is provided with a pressure dividing hole, the inner wall of the pressure dividing hole is fixedly connected to a fixed shaft, the arc surface of the fixed shaft is rotatably connected to a rotating blade, and the outer opening of the pressure dividing hole is fixedly connected to a guide tube.

[0009] Preferably, the cross-sectional shape of the inner opening of the pressure dividing hole is matched with the cross-sectional shape of the trapezoidal block, so that the pressure relief can be completed by a slight movement of the trapezoidal block.

[0010] Preferably, one end of the pressure-dividing pipeline is opened on the inner wall of the gas transmission pipe, and the other end of the pressure-dividing pipeline is opened on the inner wall of the pressure-reducing pipe, and the diameter of the opening at the other end of the pressure-dividing pipeline is matched with the diameter of the disc.

[0011] Preferably, the diameter of the sphere matches the diameter of the opening of the gas delivery pipe, and the diameter of the sphere matches the diameter of the limiting sleeve.

[0012] Preferably, the number of the rotating blades is set to be several, and the several rotating blades are installed on the surface of the fixed shaft in a circular rotation, and the surface of the rotating blades is provided with circular holes, and the circular holes are opened on the surface of the rotating blades in a filling array.

[0013] Compared with the prior art, the utility model provides a new type of anti-backfire welding cutting torch, which has the following beneficial effects:

[0014] 1. The new anti-backfire welding and cutting torch is provided with an anti-backfire mechanism. When backfire occurs, the high-temperature gas impacts the inside of the pressure reducing tube along the gas outlet, so that the sphere moves to block the pipe opening of the gas pipe to prevent the flame from reversing. At the same time, the pressure of the high-temperature gas inside the pressure reducing tube becomes stronger, so that the disc moves toward the inside of the pressure dividing pipe, and the trapezoidal block on the hollow rod moves, so that the gas is discharged from the inside of the pressure dividing hole, the internal gas is depressurized, and damage to the internal mechanism is prevented.

[0015] 2. The new anti-backfire welding torch is equipped with a protective mechanism. The depressurized gas is diverted through the circular holes on the rotating blades to form a turbulent flow phenomenon to buffer the pressure of the gas discharge, and then discharged through the guide pipe to prevent damage to personnel outside the machine, thereby further improving the safety of pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the structure of the utility model;

[0017] Figure 2 It is a three-dimensional schematic diagram of the cross section of the structure of the utility model;

[0018] Figure 3 It is a three-dimensional schematic diagram of part of the structure of the utility model;

[0019] Figure 4 It is a three-dimensional schematic diagram of the rotating blade of the utility model structure.

[0020] In the figure: 1. pressure reducing pipe; 2. connecting pipe; 3. anti-backfire mechanism; 301. air outlet pipe; 302. telescopic spring; 303. sphere; 304. air outlet hole; 305. fixing rod; 306. pressure dividing pipe; 307. limiting sleeve; 308. reset spring; 309. disc; 310. hollow rod; 311. trapezoidal block; 4. protection mechanism; 401. pressure dividing hole; 402. rotating blade; 403. fixed shaft; 404. guide tube; 405. round hole; 5. cutting nozzle; 6. control valve; 7. air supply pipe. DETAILED DESCRIPTION

[0021] like Figure 1-Figure 4 As shown, the utility model provides a technical solution: a novel anti-backfire welding cutting torch, comprising a pressure reducing tube 1, one end of the pressure reducing tube 1 is fixedly connected to one end of a connecting tube 2, the other end of the connecting tube 2 is fixedly connected to a cutting nozzle 5, the other end of the pressure reducing tube 1 is fixedly connected to a gas supply pipe 7, a control valve 6 is fixedly installed on the surface of the gas supply pipe 7, an anti-backfire mechanism 3 is arranged inside the pressure reducing tube 1, a protective mechanism 4 is arranged inside the pressure reducing tube 1, and the anti-backfire mechanism 3 comprises an outlet pipe 301, a telescopic spring 302, a sphere 303, an outlet hole 304, a fixed rod 305, a pressure dividing tube 306, a limiting sleeve 307, a reset spring 308, a disc 309, a hollow rod 310, and a trapezoidal block 311.

[0022] In one embodiment of the utility model, one end of the connecting pipe 2 close to the pressure reducing pipe 1 is fixedly connected to the air outlet pipe 301, an air outlet hole 304 is provided on the surface of the air outlet pipe 301, a limit sleeve 307 is fixedly connected to the surface of the air outlet pipe 301, a cavity is provided inside the air outlet pipe 301, a fixing rod 305 is fixedly installed inside the cavity, one end of the air outlet pipe 301 is fixedly connected to one end of the telescopic spring 302, the other end of the telescopic spring 302 is fixedly connected to the sphere 303, a pressure dividing pipe 306 is provided on the inner wall of the pressure reducing pipe 1, a disc 309 is slidably connected to the inner wall of the pressure reducing pipe 1, the lower surface of the disc 309 is fixedly connected to one end of the reset spring 308, the other end of the reset spring 308 is fixedly connected to the inner wall of the pressure dividing pipe 306, the upper surface of the disc 309 is fixedly connected to the hollow rod 310, and the upper surface of the hollow rod 310 is fixedly connected to the trapezoidal block 311.

[0023] In addition, the protective mechanism 4 includes a pressure dividing hole 401, the inner wall of the pressure reducing tube 1 is provided with a pressure dividing hole 401, the inner wall of the pressure dividing hole 401 is fixedly connected to the fixed shaft 403, the arc surface of the fixed shaft 403 is rotatably connected to the rotating blade 402, the outer opening of the pressure dividing hole 401 is fixedly connected to the guide tube 404, the cross-sectional shape of the inner opening of the pressure dividing hole 401 is adapted to the cross-sectional shape of the trapezoidal block 311, the diameter of the sphere 303 is adapted to the diameter of the opening of the gas pipe 7, the diameter of the sphere 303 is adapted to the diameter of the limit sleeve 307, the number of rotating blades 402 is set to be several, and several rotating blades 402 are installed on the surface of the fixed shaft 403 in a circular rotation, and the surface of the rotating blade 402 is provided with a circular hole 405, and the circular hole 405 is provided on the surface of the rotating blade 402 in a filling array.

[0024] In the embodiment of the utility model, one end of the pressure-dividing pipeline 306 is opened on the inner wall of the gas delivery pipe 7, and the other end of the pressure-dividing pipeline 306 is opened on the inner wall of the pressure-reducing pipe 1. The diameter of the opening at the other end of the pressure-dividing pipeline 306 is adapted to the diameter of the disc 309. At the same time, the surface of the disc 309 is provided with a protrusion, and the interior of the pressure-reducing pipe 1 is provided with a sliding groove, which facilitates the movement of the disc 309 on the surface of the sliding groove and prevents the disc 309 from falling off the straight line of the ball 303 of the pressure-dividing pipeline 306. The diameter of the sphere 303 is matched with the diameter of the limiting sleeve 307, the diameter of one end of the hollow rod 310 is matched with the diameter of the air outlet 304, and the diameter of the other end of the hollow rod 310 is smaller than the diameter of the air outlet 304. The hollow rod 310 passes through the fixing rod 305, and the interior of the fixing rod 305 is provided with a through cavity matched with the surface of the hollow rod 310, so that the hollow rod 310 fills the interior of the through cavity, so that the hollow rod 310 can move easily.

[0025] In the utility model, during use, when backfire occurs, the high-temperature gas impacts the inside of the pressure reducing tube 1 along the gas outlet 304, causing the sphere 303 to move and block the pipe opening of the gas pipe 7 to prevent the flame from reversing. At the same time, the pressure of the high-temperature gas inside the pressure reducing tube 1 becomes stronger, causing the disc 309 to move toward the inside of the pressure dividing pipe 306, causing the trapezoidal block 311 on the hollow rod 310 to move, allowing the gas to be discharged from the inside of the pressure dividing hole 401, depressurizing the internal gas to prevent damage to the internal mechanism.

[0026] Furthermore, the depressurized gas is diverted through the circular hole 405 on the rotating blade 402, forming a turbulent flow phenomenon to buffer the pressure of the discharged gas, and is discharged through the guide pipe 404 to prevent damage to personnel outside the machine, thereby further improving the safety of pressure relief.

[0027] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A novel anti-tempering welding torch, comprising a pressure reducing tube (1), one end of the pressure reducing tube (1) is fixedly connected to one end of a connecting tube (2), the other end of the connecting tube (2) is fixedly connected to a cutting nozzle (5), the other end of the pressure reducing tube (1) is fixedly connected to a gas supply pipe (7), a control valve (6) is fixedly installed on the surface of the gas supply pipe (7), characterized in that: The interior of the pressure reducing pipe (1) is provided with an anti-flashback mechanism (3), and the interior of the pressure reducing pipe (1) is provided with a protection mechanism (4), and the anti-flashback mechanism (3) comprises: An air outlet pipe (301), one end of the connecting pipe (2) close to the pressure reducing pipe (1) is fixedly connected to the air outlet pipe (301), an air outlet hole (304) is provided on the surface of the air outlet pipe (301), a limiting sleeve (307) is fixedly connected to the surface of the air outlet pipe (301), a cavity is provided inside the air outlet pipe (301), a fixing rod (305) is fixedly installed inside the cavity, one end of the air outlet pipe (301) is fixedly connected to one end of a telescopic spring (302), and the other end of the telescopic spring (302) is fixedly connected to the air outlet pipe (301). The end of the pressure reducing tube (1) is fixedly connected to a spherical body (303), the inner wall of the pressure reducing tube (1) is provided with a pressure dividing tube (306), the inner wall of the pressure reducing tube (1) is slidably connected to a disc (309), the lower surface of the disc (309) is fixedly connected to one end of a return spring (308), the other end of the return spring (308) is fixedly connected to the inner wall of the pressure dividing tube (306), the upper surface of the disc (309) is fixedly connected to a hollow rod (310), and the upper surface of the hollow rod (310) is fixedly connected to a trapezoidal block (311).

2. The novel anti-tempering welding cutting torch according to claim 1 is characterized in that: The protection mechanism (4) comprises a pressure dividing hole (401), the inner wall of the pressure reducing tube (1) is provided with the pressure dividing hole (401), the inner wall of the pressure dividing hole (401) is fixedly connected to a fixed shaft (403), the arc surface of the fixed shaft (403) is rotatably connected to a rotating blade (402), and the outer opening of the pressure dividing hole (401) is fixedly connected to a guide tube (404).

3. The novel anti-tempering welding cutting torch according to claim 2 is characterized in that: The cross-sectional shape of the inner opening of the pressure dividing hole (401) is compatible with the cross-sectional shape of the trapezoidal block (311).

4. The novel anti-tempering welding cutting torch according to claim 1 is characterized in that: One end of the pressure-dividing pipeline (306) is opened on the inner wall of the gas transmission pipe (7), and the other end of the pressure-dividing pipeline (306) is opened on the inner wall of the pressure-reducing pipe (1). The diameter of the opening at the other end of the pressure-dividing pipeline (306) is matched to the diameter of the disc (309).

5. The novel anti-tempering welding cutting torch according to claim 1 is characterized in that: The diameter of the sphere (303) matches the diameter of the opening of the gas delivery pipe (7), and the diameter of the sphere (303) matches the diameter of the limiting sleeve (307).

6. The novel anti-tempering welding cutting torch according to claim 2 is characterized in that: The number of the rotating blades (402) is set to be a plurality, and the plurality of rotating blades (402) are mounted on the surface of a fixed shaft (403) in a circular rotation manner. Circular holes (405) are provided on the surface of the rotating blades (402), and the circular holes (405) are provided on the surface of the rotating blades (402) in a filling array.

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