Flame control system for flame spraying

Abstract

The invention discloses a flame control system for flame spraying, which comprises an air branch, an oxygen branch, an acetylene branch and a mixed gas anti-backfire device, and the oxygen branch and the acetylene branch are respectively communicated with the mixed gas anti-backfire device; the gas mixing anti-backfire device comprises a shell, a gas mixing assembly and a speed reducer, the shell comprises a gas inlet end and a gas outlet end, the gas inlet end comprises an oxygen inlet communicated with an oxygen branch and an acetylene inlet communicated with an acetylene branch, and the gas outlet end is close to an outlet of an air branch; the oxygen inlet and the acetylene inlet are respectively provided with a first one-way valve; the gas mixing assembly and the speed reducer are arranged in the shell in the direction from the gas inlet end to the gas outlet end. According to the gas mixing anti-backfire device, the gas mixing assembly is used for fully mixing acetylene and oxygen, the speed reducer is used for limiting the speed of mixed gas, meanwhile, the speed reducer can greatly reduce backflow impact caused by abnormal conditions at the front end of the spray gun, and the safety of operators is protected.

Description

Technical Field

[0001] The invention relates to the technical field of flame spraying, and in particular to a flame control system for flame spraying. Background Art

[0002] As an important branch of surface coating technology, flame spraying technology is widely used in aerospace, automobile manufacturing, energy and chemical industries. The danger of traditional flame spray guns using the method of mixing air in the gun body is that once an explosion occurs, the explosion point is the mixing point, which is too close to the operator, and the safety of the operator is difficult to guarantee. At the same time, traditional flame spray guns have limitations in improving production efficiency and coating quality, such as uneven spraying, poor flame stability, high energy consumption, and especially safety issues. Summary of the invention

[0003] The purpose of the present invention is to provide a flame control system for flame spraying, so as to solve the problem that the safety of operators is difficult to ensure when flashback and deflagration occur in the existing flame spraying method.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] A flame control system for flame spraying, comprising: an air branch, an oxygen branch, an acetylene branch and a mixed gas anti-flashback device, wherein the oxygen branch and the acetylene branch are respectively connected to the mixed gas anti-flashback device;

[0006] The gas mixing backfire prevention device comprises a shell, a gas mixing component and a reducer. The shell comprises an air inlet end and an air outlet end. The air inlet end comprises an oxygen inlet port connected to the oxygen branch and an acetylene inlet port connected to the acetylene branch. The air outlet end is close to the outlet of the air branch. The oxygen inlet port and the acetylene inlet port are respectively provided with a first one-way valve. The gas mixing component and the reducer are arranged in the shell along the direction from the air inlet end to the air outlet end.

[0007] Furthermore, the above-mentioned reducer has a cylindrical structure, and an axial hole is opened axially on the inner side; a plurality of U-shaped holes are opened on the inner wall of the reducer, and the U-shaped holes are inclined toward the air outlet end, and the inlet of the U-shaped hole is located on the side close to the air inlet end relative to the outlet of the U-shaped hole.

[0008] Furthermore, the above-mentioned gas mixing assembly includes a connecting shaft and a plurality of gas mixing plates arranged on the connecting shaft, the gas mixing plates are vertically arranged inside the shell, and the outer edges of the gas mixing plates are in contact with the inner side walls of the shell, and the gas mixing plates are provided with a plurality of flow holes.

[0009] Furthermore, an air mixing fan is slidably arranged on the connecting shaft, and a limit ring and a ratchet ring are fixedly arranged at positions of the connecting shaft on both sides of the air mixing fan, and the limit ring and the ratchet ring are respectively close to the air outlet end and the air inlet end, and the air mixing fan is provided with ratchet teeth meshing with the ratchet ring;

[0010] When the forward airflow is greater than the reverse airflow, the air mixing fan contacts the limit ring, and when the reverse airflow is greater than the forward airflow, the ratchet teeth mesh with the ratchet ring.

[0011] Furthermore, it also includes a first high-pressure air branch and a second high-pressure air branch, the first high-pressure air branch is connected to the acetylene branch through a first horizontal pipe, and the second high-pressure air branch is connected to the oxygen branch through a first vertical pipe, a second horizontal pipe, and a second vertical pipe in sequence;

[0012] The second high-pressure air branch is connected to the acetylene inlet through the first straight pipe and the third horizontal pipe in sequence, and the first straight pipe is connected to the first vertical pipe.

[0013] Furthermore, the second vertical pipe is connected to the first straight pipe and the third horizontal pipe through the first curved pipe and the second curved pipe in sequence;

[0014] The first elbow and the second elbow are connected to the acetylene branch through the third vertical pipe, and the third vertical pipe is located close to the third horizontal pipe.

[0015] Furthermore, the first vertical pipe is connected to the first high-pressure air branch and the first horizontal pipe through a third curved pipe, and the curved portion of the third curved pipe is located above the first straight pipe, and the straight portion of the third curved pipe is parallel to the first straight pipe.

[0016] Furthermore, it also includes an outer shell, the interior of the outer shell is hollow, and the air branch, oxygen branch, acetylene branch, mixed gas backfire prevention device, first high-pressure air branch and second high-pressure air branch are all arranged on the inner bottom wall of the outer shell; the top of the outer shell is respectively provided with pipe joints connected to the air inlet of the air branch, the air inlet of the oxygen branch, and the air inlet of the acetylene branch, and the side wall of the outer shell is provided with outlet joints connected to the air outlet and the outlet end of the air branch respectively.

[0017] Furthermore, the air branch, oxygen branch and acetylene branch are each provided with a first control valve, a flow meter and a second one-way valve in sequence; a control display module is provided at the front end of the housing; the first control valve and the flow meter are respectively connected to the control display module for communication;

[0018] A filter is provided on the oxygen branch, and the filter is located between the flow meter on the oxygen branch and the second one-way valve, and the second vertical pipe is located between the filter on the oxygen branch and the second one-way valve;

[0019] The first transverse pipe is located between the second one-way valve on the acetylene branch and the acetylene inlet;

[0020] An anti-flashback valve is also provided on the acetylene branch line, and the anti-flashback valve is located between the connection between the first transverse pipe and the acetylene branch line and the acetylene inlet.

[0021] Furthermore, the first high-pressure air branch and the second high-pressure air branch are respectively provided with a second control valve and a third one-way valve, and the second control valve is communicatively connected with the control and display module.

[0022] The present invention has the following beneficial effects:

[0023] 1. The flame control system for flame spraying of the present invention is provided with a gas mixing anti-flashback device at the end of the flame control system (i.e., the end of a traditional flame spray gun), wherein the gas mixing component is used to fully mix acetylene with oxygen, and the reducer is used to limit the velocity of the mixed gas. The reducer can also greatly reduce the backflow impact caused by abnormal conditions at the front end of the spray gun, thereby protecting the safety of the operator, and the gas mixing component and the reducer are integrated into one, thereby better ensuring the air tightness; the provision of the gas mixing anti-flashback device allows oxygen and acetylene to be mixed and used immediately, away from the operator holding the gun, and even if flashback and deflagration occur, the probability of injury to the operator is greatly reduced, thereby greatly improving the operational safety, and at the same time, the provision of the first one-way valve can effectively prevent the position of the flashback and deflagration from being close to the operator, thereby greatly improving the operational safety.

[0024] 2. The gas mixing assembly of the present invention is provided with a plurality of flow holes on the gas mixing plate, so that oxygen and acetylene can be fully mixed when flowing through the gas mixing plate; at the same time, the gas mixing fan can rotate through the mixed gas under normal working conditions, which is not only convenient for gas mixing, but also convenient for gas discharge to the gas outlet end. When the airflow enters in the reverse direction (that is, when the airflow flows back from the gas outlet end to the gas inlet end), the airflow blows the gas mixing fan and makes the ratchet teeth of the gas mixing fan engage with the ratchet ring. At this time, the gas mixing fan cannot rotate, and the gas flowing in in the reverse direction will be hindered, which plays a role in weakening the airflow, thereby slowing down the degree of backfire burning the first one-way valve and spreading to the gun body, thereby improving safety.

[0025] 3. In the flame control system for flame spraying of the present invention, the first high-pressure air branch and the second high-pressure air branch are connected to the external compressed air, and have a "pipeline connection" function. In case of emergency, such as flashback, explosion, abnormal flow ratio, system emergency stop, etc., the first high-pressure air branch and the second high-pressure air branch are connected to the oxygen branch and the acetylene branch through compressed air to ensure that the acetylene and oxygen gases are quickly discharged from the pipeline, thereby achieving the effect of fire extinguishing and avoiding flashback.

[0026] 4. The present invention sets the first straight pipe and the third transverse pipe. Since the compressed air of the first straight pipe and the second high-pressure air branch has the same flow direction, the airflow on the first straight pipe and the third transverse pipe is the largest. Therefore, when backfire and deflagration occur, they can play a major role in extinguishing the fire.

[0027] 5. The first horizontal pipe, the first vertical pipe, the second horizontal pipe, the second vertical pipe, the first straight pipe, the third horizontal pipe, the first elbow, the second elbow, the third vertical pipe, and the third elbow of the present invention, the inner diameters of the pipes on the first high-pressure air branch, the pipes on the second high-pressure air branch, the first straight pipe, the first vertical pipe, and the third elbow are all larger than the main pipe. The branch pipes on the first high-pressure air branch are more numerous and have more corners than the branch pipes on the second high-pressure air branch. Therefore, the gas flow on the first straight pipe, the first vertical pipe, and the third elbow is larger than the flow on other branch pipes. By arranging the first elbow, the second elbow, and the third vertical pipe, the inner diameters of the first elbow and the second elbow are smaller than those of other pipes. The first elbow and the second elbow can introduce a small part of the airflow, reduce the flow velocity in the main pipe, thereby reducing the turbulence intensity and improving the airflow stability. The branching and confluence of the first elbow and the second elbow can play a buffering role, which helps to reduce the pressure fluctuation in the main pipe. In the first elbow and the second elbow, the turbulence is partially dissipated due to the smaller inner diameter, and the gas flow is more uniform when re-converging.

[0028] 6. The present invention sets a first elbow and a second elbow. When the airflow impacts in the reverse direction, the existence of the first elbow and the second elbow can disperse a part of the gas flow, thereby reducing the backflow intensity and speed in the main pipeline. This buffering effect can reduce the energy of the backflow impact; the first elbow and the second elbow can guide part of the airflow to flow into other pipelines, thereby reducing the pressure wave amplitude in the main pipeline and reducing the intensity of the backflow fluctuation; in the first elbow and the second elbow, when the high-speed airflow passes through a smaller inner diameter, the turbulent part is dissipated, and the impact is weakened when it re-converges.

[0029] 7. The present invention can protect the air branch, oxygen branch, acetylene branch, mixed gas backfire prevention device, first high-pressure air branch and second high-pressure air branch by providing a shell and integrating the control display module on the shell; the control display module is used to monitor the flame spraying and adjust the spraying parameters, so as to adapt to the spraying requirements of different workpieces and materials, and can preset a variety of spraying modes, which is convenient for one-key switching of different spraying modes according to usage requirements, thereby improving the convenience and accuracy of operation; the filter on the oxygen branch can remove impurities in the gas, ensure the smooth flow of the pipeline during long-term operation, and avoid flame abnormalities caused by internal pipeline blockage or excessive moisture in the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the flame control system of the present invention;

[0031] Figure 2 It is a schematic diagram of the internal structure of the flame control system of the present invention;

[0032] Figure 3It is a schematic diagram of the specific structure of the flame control system of the present invention;

[0033] Figure 4 It is a schematic diagram of the cross-sectional structure of the gas mixture anti-flashback device;

[0034] Figure 5 is a schematic diagram of the cross-sectional structure of the reducer;

[0035] Figure 6 for Figure 4 A schematic diagram of the enlarged structure at point A;

[0036] Figure 7 It is a schematic diagram of the specific structure of the branch pipeline of the flame control system of the present invention.

[0037] In the figure: 10, air branch; 20, oxygen branch; 30, acetylene branch; 40, mixed gas backfire prevention device; 41, shell; 411, air inlet; 412, air outlet; 413, oxygen inlet; 414, acetylene inlet; 415, first one-way valve; 42, mixed gas assembly; 421, connecting shaft; 422, mixed gas plate; 423, mixed gas fan; 424, limit ring; 425, ratchet ring; 426, ratchet; 43, reducer; 431, U-shaped hole; 50, first high-pressure air branch; 51, first Control valve; 52, flow meter; 53, second one-way valve; 54, filter; 55, anti-backfire valve; 60, second high-pressure air branch; 70, first horizontal pipe; 71, first vertical pipe; 72, second horizontal pipe; 73, second vertical pipe; 74, first straight pipe; 75, third horizontal pipe; 76, first elbow; 77, second elbow; 78, third vertical pipe; 79, third elbow; 80, second control valve; 81, third one-way valve; 90, housing; 91, pipe joint; 92, air outlet joint; 93, control display module. DETAILED DESCRIPTION

[0038] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0039] like Figures 2 to 6As shown, in an embodiment of the present invention, a flame control system for flame spraying is provided, comprising: an air branch 10, an oxygen branch 20, an acetylene branch 30 and a mixed gas anti-flashback device 40; the oxygen branch 20 and the acetylene branch 30 are respectively connected to the mixed gas anti-flashback device 40, and the outlet of the air branch 10 is close to the outlet of the mixed gas anti-flashback device 40. The air branch 10, the oxygen branch 20 and the acetylene branch 30 are sequentially provided with a first control valve 51, a flow meter 52 and a second check valve 53. The mixed gas anti-flashback device 40 is used to fully mix oxygen and acetylene and to limit the velocity of the mixed gas. Oxygen and acetylene are used immediately after mixing, and the mixed gas is located at the front end of the flame spray gun, away from the operator holding the gun. Even if flashback and deflagration occur, the probability of injury to the operator will be greatly reduced, and the operation safety will be greatly improved.

[0040] Specifically, the gas mixture backfire prevention device 40 includes a shell 41, a gas mixture component 42 and a reducer 43. The shell 41 includes an air inlet end 411 and an air outlet end 412. The air inlet end 411 includes an oxygen inlet port 413 connected to the oxygen branch 20 and an acetylene inlet port 414 connected to the acetylene branch 30. The air outlet end 412 is close to the outlet of the air branch 10. The mixed gas of oxygen and acetylene is mixed with air and then burned. In order to prevent the gas from flowing back to the rear end of the flame spray gun, in this embodiment, the oxygen inlet port 413 and the acetylene inlet port 414 are respectively provided with a first one-way valve 415. The gas mixture component 42 and the reducer 43 are arranged in the shell 41 along the direction from the air inlet end 411 to the air outlet end 412.

[0041] Among them, the mixing component 42 includes a connecting shaft 421 and a plurality of mixing plates 422 arranged on the connecting shaft 421, all the mixing plates 422 are respectively arranged at intervals on the connecting shaft 421, the mixing plates 422 are vertically arranged inside the shell 41, and the outer edges of the mixing plates 422 are in contact with the inner wall of the shell 41, and the mixing plates 422 are provided with a plurality of flow holes, and the flow holes can be arranged in a matrix arrangement or a ring array lamp manner; due to the presence of the mixing plates 422, oxygen and acetylene can be fully mixed in the shell 41.

[0042] In order to better mix oxygen and acetylene, in the present embodiment, a mixing fan 423 is slidably provided on the connecting shaft 421, and a limiting ring 424 and a ratchet ring 425 are fixedly provided at positions on both sides of the mixing fan 423 of the connecting shaft 421, and the limiting ring 424 and the ratchet ring 425 are respectively close to the air outlet end 412 and the air inlet end 411, and a ratchet 426 meshing with the ratchet ring 425 is provided on the mixing fan 423; when the forward airflow is greater than the reverse airflow, the mixing fan 423 contacts with the limiting ring 424, and when the reverse airflow is greater than the forward airflow, the ratchet 426 meshes with the ratchet ring 425.

[0043] When oxygen and acetylene enter the shell 41, the connecting shaft 421 and the mixing plate 422 will not move. The mixing fan 423 will rotate and move under the influence of the airflow under normal operation, and move to contact with the limit ring 424, which is not only convenient for gas mixing, but also convenient for gas discharge. When the gas enters in the reverse direction, the airflow blows the mixing fan 423, and makes the ratchet 426 of the mixing fan 423 engage with the ratchet ring 425. At this time, the mixing fan 423 cannot rotate, and the gas flowing in the reverse direction will be hindered, which has the effect of weakening the airflow, thereby slowing down the degree of backfire burning the first one-way valve 415 and spreading to the gun body, thereby improving safety.

[0044] The reducer 43 is a cylindrical structure, and an axial hole is opened on its inner side along the axial direction; a plurality of U-shaped holes 431 are opened on the inner wall of the reducer 43, and the U-shaped holes 431 are inclined toward the direction of the gas outlet end 412, and the inlet of the U-shaped hole 431 is located on the side close to the gas inlet end 411 relative to the outlet of the U-shaped hole 431. Specifically, the inlet and outlet of the U-shaped hole 431 are both located on the inner wall of the reducer 43, wherein the inlet is closer to the side of the gas inlet end 411 than the outlet, and the outlet is closer to the side of the gas outlet end 412 than the inlet. In normal operation, the mixed gas enters from the orifice of the U-shaped hole 431 close to the gas inlet end 411 and is ejected from the orifice close to the gas outlet end 412, and the mixed gas ejected from the U-shaped hole 431 interacts with the mixed gas ejected outward from the middle of the reducer 43, thereby reducing the overall flow rate of the mixed gas.

[0045] like Figure 7 As shown, another embodiment of the present invention provides a flame control system for flame spraying, which also includes a first high-pressure air branch 50 and a second high-pressure air branch 60. The first high-pressure air branch 50 is connected to the acetylene branch 30 through a first transverse pipe 70, and the second high-pressure air branch 60 is connected to the oxygen branch 20 through a first vertical pipe 71, a second transverse pipe 72, and a second vertical pipe 73 in sequence; the first high-pressure air branch 50 and the second high-pressure air branch 60 are respectively provided with a second control valve 80 and a third one-way valve 81; the first high-pressure air branch 50 and the second high-pressure air branch 60 are respectively connected to an external air compressor pipe. In case of emergency, such as flashback, abnormal flow ratio, system emergency stop, etc., the first high-pressure air branch 50 and the second high-pressure air branch 60 are connected to the oxygen branch 20 and the acetylene branch 30 through compressed air, so as to ensure that the acetylene and oxygen gases are quickly discharged from the pipeline, so as to achieve the effect of fire extinguishing and avoid flashback.

[0046] The second high-pressure air branch 60 is connected to the acetylene inlet 414 through the first straight pipe 74 and the third transverse pipe 75 in sequence, and the first straight pipe 74 is connected to the first vertical pipe 71. The second vertical pipe 73 is connected to the first straight pipe 74 and the third transverse pipe 75 through the first elbow pipe 76 and the second elbow pipe 77 in sequence; the first elbow pipe 76 and the second elbow pipe 77 are connected to the acetylene branch 30 through the third vertical pipe 78, and the third vertical pipe 78 is located near the third transverse pipe 75.

[0047] The first vertical pipe 71 is connected to the first high-pressure air branch 50 and the first horizontal pipe 70 through the third curved pipe 79, and the curved portion of the third curved pipe 79 is located above the first straight pipe 74, and the straight portion of the third curved pipe 79 is parallel to the first straight pipe 74. In this embodiment, the pipes are connected by three-way pipe joints.

[0048] In order to prevent the pipeline on the oxygen branch 20 from being blocked or the flame from being abnormal due to excessive moisture in the gas on the oxygen branch 20, a filter 54 is provided on the oxygen branch 20, and the filter 54 is located between the flow meter 52 on the oxygen branch 20 and the second one-way valve 53. At the same time, a filter 54 (not shown) can also be provided on the acetylene branch 30 to avoid affecting the flame temperature.

[0049] In this embodiment, the second vertical pipe 73 is located between the filter 54 and the second one-way valve 53 on the oxygen branch 20; the first horizontal pipe 70 is located between the second one-way valve 53 and the acetylene inlet 414 on the acetylene branch 30. In order to further prevent backfire, an anti-backfire valve 55 is also provided on the acetylene branch 30. The anti-backfire valve 55 adopts an existing backfire preventer and is located between the connection between the first horizontal pipe 70 and the acetylene branch 30 and the acetylene inlet 414.

[0050] In this embodiment, the inner diameters of the pipes on the first high-pressure air branch 50, the pipes on the second high-pressure air branch 60, the first straight pipe 74, the first vertical pipe 71 and the third curved pipe 79 are larger than the inner diameter of the pipes on the main pipe, among which the pipes on the air branch 10, the pipes on the oxygen branch 20 and the pipes on the acetylene branch 30 are main pipes.

[0051] During normal operation:

[0052] (1) The first high-pressure air branch 50 and the second high-pressure air branch 60 are closed;

[0053] (2) The oxygen in the oxygen branch 20 enters the mixed gas anti-flashback device 40 from the oxygen inlet 413, and the acetylene in the acetylene branch 30 enters the mixed gas anti-flashback device 40 from the acetylene inlet 414. The oxygen and acetylene are mixed and then sprayed outward, and then mixed with the air sprayed from the air branch 10 and ignited to perform flame spraying;

[0054] Among them, oxygen will be diverted to the first elbow 76 through the second vertical pipe 73, and acetylene will be diverted to the second elbow 77 through the third vertical pipe 78. A small part of the airflow is introduced to reduce the flow velocity in the main pipeline, thereby reducing the turbulence intensity and improving the airflow stability. The branching and confluence of the branch pipes can play a buffering role and help reduce the pressure fluctuations in the main pipeline.

[0055] Emergency stop or fire extinguishing state:

[0056] (1) closing the first control valve 51 on the oxygen branch 20 and the acetylene branch 30, and opening the second control valve 80 on the first high-pressure air branch 50 and the second high-pressure air branch 60;

[0057] (2) The first high-pressure air branch 50 delivers compressed air to the first transverse pipe 70 to the acetylene branch 30, so that the acetylene remaining on the acetylene branch 30 can be blown into the mixed air anti-flashback device 40;

[0058] (3) The second high-pressure air branch 60 delivers compressed air to the oxygen branch 20 through the first vertical pipe 71, the second horizontal pipe 72 and the second vertical pipe 73 in sequence, thereby blowing the residual oxygen on the oxygen branch 20 into the mixed air anti-flashback device 40;

[0059] (4) The second high-pressure air branch 60 simultaneously blows the compressed air into the mixed air anti-backfire device 40 through the first straight pipe 74 and the third transverse pipe 75 in sequence. Since the compressed air of the first straight pipe 74 and the second high-pressure air branch 60 have the same flow direction, the airflow on the first straight pipe 74 and the third transverse pipe 75 is the largest. Therefore, when backfire and deflagration occur, they can play a major role in extinguishing the fire. At this time, the first curved pipe 76 and the second curved pipe 77 play a role in stabilizing the flow.

[0060] In case of accidental deflagration:

[0061] (1) Fire extinguishing does not work: The airflow will first be offset by the internal reducer 43 and the air mixing assembly 42 in the mixing anti-backfire device 40 to partially offset the strong airflow impact. Most of the airflow that is not blocked in the mixing anti-backfire device 40 enters the third horizontal pipe 75, and is then diverted by the first straight pipe 74 and the second elbow 77. A small part of the airflow that is not blocked in the mixing anti-backfire device 40 enters the tail end of the acetylene branch 30 and is diverted by the third vertical pipe 78 and the first elbow 76. The airflow impact is basically alleviated;

[0062] (2) Fire extinguishing: Once deflagration occurs, the flow meter 52 will immediately sense the air flow abnormality, and the first high-pressure air branch 50 and the second high-pressure air branch 60 will immediately deliver compressed air to the acetylene branch 30 and the oxygen branch 20, thereby achieving fire extinguishing.

[0063] like Figure 1As shown, another embodiment of the present invention provides a flame control system for flame spraying, which also includes a shell 90, the interior of the shell 90 is hollow, and the air branch 10, the oxygen branch 20, the acetylene branch 30, the mixed gas backfire prevention device 40, the first high-pressure air branch 50 and the second high-pressure air branch 60 are all arranged on the inner bottom wall of the shell 90; the shell 90 plays a protective role. In addition, an inner shell is respectively covered on the oxygen branch 20 and the acetylene branch 30, and the first high-pressure air branch 50 and the second high-pressure air branch 60, and the inner shell is located on the inner bottom wall of the shell 90 for further protection. The top of the shell 90 is respectively provided with a pipe joint 91 connected to the air inlet of the air branch 10, the air inlet of the oxygen branch 20, and the air inlet of the acetylene branch 30, and the side wall of the shell 90 is provided with an outlet joint 92 respectively connected to the air outlet of the air branch 10 and the outlet end 412; the front end of the shell 90 is provided with a control display module 93. The first control valve 51 and the flow meter 52 are respectively connected to the control display module 93 in communication; the second control valve 80 is connected to the control display module 93 in communication. The control display module 93 includes a touch screen and a control chip embedded in the back panel of the touch screen, and the specific model of the control chip is tpc-312-R833A; the control display module 93 is used to monitor the flame spraying and adjust the spraying parameters, so as to meet the spraying requirements of different workpieces and materials, and can preset multiple spraying modes, so as to facilitate one-key switching of different spraying modes according to the use requirements, thereby improving the convenience and accuracy of operation.

[0064] The flame spray gun safety control method of the flame control system for flame spraying based on this embodiment is as follows:

[0065] S1: Air, oxygen and acetylene enter the air branch 10, oxygen branch 20 and acetylene branch 30 respectively through the first control valve 51;

[0066] S2: The flow meter 52 obtains and feeds back the flow rates of air, oxygen and acetylene, and determines whether the flow rate ratio is within the fluctuation range. If the flow rate ratio is outside the fluctuation range, the process proceeds to step S3; if the flow rate ratio is within the fluctuation range, the process proceeds to step S4;

[0067] S3: All first control valves 51 are closed, and compressed air enters the first high-pressure air branch 50 and the second high-pressure air branch 60, taking over the oxygen branch 20 and the acetylene branch 30, and quickly discharging oxygen and acetylene to the outside;

[0068] S4: judging the relationship between the temperature data fed back by the thermocouples provided in the gas mixture anti-flashback device 40 and the flame spray gun body and the set temperature threshold, if the temperature data is less than or equal to the set temperature threshold, proceeding to step S5, if the temperature data is greater than the set temperature threshold, proceeding to step S6;

[0069] S5: Normal operation;

[0070] S6: All first control valves 51 are closed, and compressed air enters the first high-pressure air branch 50 and the second high-pressure air branch 60, taking over the oxygen branch 20 and the acetylene branch 30, and quickly discharges oxygen and acetylene to the outside.

[0071] The method can be implemented by controlling the display module 93 and manually operated in conjunction with the touch screen therein.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flame control system for flame spraying, characterized in that: include: An air branch (10), an oxygen branch (20), an acetylene branch (30) and a mixed gas anti-flashback device (40), wherein the oxygen branch (20) and the acetylene branch (30) are respectively connected to the mixed gas anti-flashback device (40); The mixed gas backfire prevention device (40) comprises a shell (41), a mixed gas component (42) and a reducer (43); the shell (41) comprises an air inlet end (411) and an air outlet end (412); the air inlet end (411) comprises an oxygen inlet port (413) in communication with the oxygen branch (20) and an acetylene inlet port (414) in communication with the acetylene branch (30); the air outlet end (412) is close to the outlet of the air branch (10); the oxygen inlet port (413) and the acetylene inlet port (414) are respectively provided with a first non-return valve (415); the mixed gas component (42) and the reducer (43) are arranged in the shell (41) along the direction from the air inlet end (411) to the air outlet end (412).

2. The flame control system for flame spraying according to claim 1, characterized in that: The reducer (43) is in a cylindrical structure, and an axial hole is provided on its inner side along the axial direction; a plurality of U-shaped holes (431) are provided on the inner wall of the reducer (43), and the U-shaped holes (431) are inclined toward the direction of the air outlet end (412), and the inlet of the U-shaped hole (431) is located on a side close to the air inlet end (411) relative to the outlet of the U-shaped hole (431).

3. The flame control system for flame spraying according to claim 1, characterized in that: The gas mixing assembly (42) comprises a connecting shaft (421) and a plurality of gas mixing plates (422) arranged on the connecting shaft (421); the gas mixing plates (422) are vertically arranged inside the shell (41), and the outer edges of the gas mixing plates (422) are in contact with the inner side walls of the shell (41); and the gas mixing plates (422) are provided with a plurality of flow holes.

4. The flame control system for flame spraying according to claim 3, characterized in that: An air mixing fan (423) is slidably provided on the connecting shaft (421), and a limit ring (424) and a ratchet ring (425) are fixedly provided on the connecting shaft (421) at positions on both sides of the air mixing fan (423), and the limit ring (424) and the ratchet ring (425) are respectively close to the air outlet end (412) and the air inlet end (411), and the air mixing fan (423) is provided with ratchet teeth (426) meshing with the ratchet ring (425); When the forward airflow is greater than the reverse airflow, the air mixing fan (423) contacts the limiting ring (424), and when the reverse airflow is greater than the forward airflow, the ratchet (426) meshes with the ratchet ring (425).

5. The flame control system for flame spraying according to any one of claims 1 to 4, characterized in that: It also includes a first high-pressure air branch (50) and a second high-pressure air branch (60), wherein the first high-pressure air branch (50) is connected to the acetylene branch (30) via a first transverse pipe (70), and the second high-pressure air branch (60) is connected to the oxygen branch (20) via a first vertical pipe (71), a second transverse pipe (72), and a second vertical pipe (73) in sequence; The second high-pressure air branch (60) is connected to the acetylene inlet (414) via a first straight pipe (74) and a third horizontal pipe (75) in sequence, and the first straight pipe (74) is connected to the first vertical pipe (71).

6. The flame control system for flame spraying according to claim 5, characterized in that: The second vertical pipe (73) is connected to the first straight pipe (74) and the third horizontal pipe (75) through a first curved pipe (76) and a second curved pipe (77) in sequence; The first curved pipe (76) and the second curved pipe (77) are connected to the acetylene branch (30) via a third vertical pipe (78), and the third vertical pipe (78) is located close to the third horizontal pipe (75).

7. The flame control system for flame spraying according to claim 5, characterized in that: The first vertical pipe (71) is connected to the first high-pressure air branch (50) and the first horizontal pipe (70) through a third curved pipe (79), and the curved portion of the third curved pipe (79) is located above the first straight pipe (74), and the straight portion of the third curved pipe (79) is parallel to the first straight pipe (74).

8. The flame control system for flame spraying according to claim 5, characterized in that: The invention also comprises an outer shell (90), the interior of the outer shell (90) is hollow, and the air branch (10), the oxygen branch (20), the acetylene branch (30), the mixed gas backfire prevention device (40), the first high-pressure air branch (50) and the second high-pressure air branch (60) are all arranged on the inner bottom wall of the outer shell (90); the top of the outer shell (90) is respectively provided with a pipe joint (91) connected to the air inlet of the air branch (10), the air inlet of the oxygen branch (20) and the air inlet of the acetylene branch (30); the side wall of the outer shell (90) is provided with an outlet joint (92) respectively connected to the air outlet of the air branch (10) and the air outlet end (412).

9. The flame control system for flame spraying according to claim 8, characterized in that: The air branch (10), the oxygen branch (20) and the acetylene branch (30) are each provided with a first control valve (51), a flow meter (52) and a second check valve (53) in sequence; a control display module (93) is provided at the front end of the housing (90); the first control valve (51) and the flow meter (52) are respectively connected to the control display module (93) in communication; A filter (54) is provided on the oxygen branch (20), and the filter (54) is located between the flow meter (52) and the second one-way valve (53) on the oxygen branch (20), and the second vertical pipe (73) is located between the filter (54) and the second one-way valve (53) on the oxygen branch (20); The first cross pipe (70) is located between the second one-way valve (53) on the acetylene branch (30) and the acetylene inlet (414); The acetylene branch (30) is also provided with an anti-flashback valve (55), and the anti-flashback valve (55) is located between the connection point between the first transverse pipe (70) and the acetylene branch (30) and the acetylene inlet (414).

10. The flame control system for flame spraying according to claim 9, characterized in that: The first high-pressure air branch (50) and the second high-pressure air branch (60) are each provided with a second control valve (80) and a third one-way valve (81) in sequence, and the second control valve (80) is communicatively connected to the control display module (93).

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