CN117587353B - Thermal spraying device - Google Patents

Abstract

The invention relates to the technical field of thermal spraying, and discloses a thermal spraying device, which includes a flame gun. The flame gun includes a gun base and a gun rod. An oxygen pipe and a fuel pipe are provided at the bottom of the gun base. A mixing chamber is provided inside, and the upper ends of the oxygen pipe and the fuel pipe are connected to the mixing chamber. Both oxygen and fuel are transported to the mixing chamber and mixed in the mixing chamber; the thermal spray device passes through the oxygen pipe. A trigger plate one, a blocking plate two and a trigger plate two and a blocking plate one are respectively provided in the and fuel pipes, which can realize the linked transportation of oxygen and gaseous fuel. At the same time, the air pressure in the mixing chamber is used to control the relationship between the baffle, the powder feeding pipe and the air inlet pipe. to change the relative positional relationship between the baffle and the powder feeding pipe and the air inlet pipe. The baffle is used to control the opening and closing of the powder pipe and the air inlet pipe, which can avoid the waste of powder, thereby realizing the realization of oxygen, gaseous fuel and Linked conveying of powder.

Description

A thermal spraying device

Technical field

The invention relates to the technical field of thermal spraying, specifically a thermal spraying device.

Background technique

Thermal spraying is a technology that deposits fine and dispersed metallic or non-metallic coating materials onto the surface of the workpiece substrate in a molten or semi-melted state, including arc spraying, plasma spraying, and flame spraying. Flame spraying is the The gaseous fuel mixed with the coating powder is ignited, the powder is melted by the flame, and the melted coating material is deposited on the surface of the workpiece substrate with the help of the flame.

The oxygen, gaseous fuel and powder inside the flame gun for flame spraying are fed through separate conveying channels. The oxygen, gaseous fuel and powder feeding conveying channels in the traditional flame gun are not related to each other and have separate controls. The valve controls the transportation. During use, if the oxygen transportation is interrupted, the gaseous fuel will be transported alone, which will cause the gaseous fuel to be burned insufficiently, and the hot melt treatment of the powder will not be completed. At the same time, the gaseous fuel will diffuse into the surrounding environment. In addition, when the gas fuel supply is insufficient, the continuous transportation of powder will not only fail to effectively deposit the powder on the surface of the workpiece, but will also cause continuous waste of powder.

Contents of the invention

In order to solve the above problem that the oxygen, gaseous fuel and powder transportation channels in the traditional flame gun are not related to each other. If the oxygen transportation is interrupted, the gaseous fuel will not be fully burned, and the hot melt treatment of the powder will not be completed. At the same time, the gaseous fuel will Diffusion into the surrounding environment. When the supply of gaseous fuel is insufficient, not only the powder cannot be effectively deposited on the surface of the workpiece, but also the problem of continuous waste of powder will be caused. The present invention is realized through the following technical solutions: a thermal spraying device, including Flame gun. The flame gun includes a gun base, a gun rod and an electronic igniter installed inside the gun rod. An oxygen pipe and a fuel pipe are provided at the bottom of the gun base. The pipe fitting for transporting oxygen is connected to the oxygen pipe to transport gaseous fuel. The pipe fitting is connected to the fuel pipe. A mixing chamber is provided inside the gun seat. The upper ends of the oxygen pipe and the fuel pipe are both connected to the mixing chamber. Oxygen and fuel are transported to the mixing chamber and mixed in the mixing chamber. medium mix;

A trigger plate 1 is installed inside the oxygen pipe, and the trigger plate 1 is rotated and installed inside the oxygen pipe along the axial direction. A blocking plate 1 is installed inside the fuel pipe, and the blocking plate 1 is installed slidingly in the radial direction;

When the oxygen pipe transports oxygen gas flow, the air flow can push the trigger plate to rotate, and the trigger plate will linkage to drive the blocking plate to move, so that the blocking plate is separated from the fuel pipe;

When there is no oxygen in the oxygen pipe, the trigger plate does not rotate, the blocking plate and the fuel pipe are in a matching state, and the pipeline inside the fuel pipe is in a closed state. At this time, the fuel pipe cannot be used to transport gaseous fuel to the mixing chamber. .

The side surface of the gun base is provided with a powder feeding pipe and an air inlet pipe, and the inside of the gun base is provided with a feeding cavity. The powder feeding pipe and the air inlet pipe are both connected to the inside of the feeding cavity. The powder feeding pipe A baffle is installed and slid simultaneously in the radial direction of the air inlet pipe. The air pressure in the mixing chamber is used to control the position of the baffle. The sliding of the baffle is used to control the internal pipelines of the powder feeding pipe and the air inlet pipe. opening and closing;

When the gas delivered by the oxygen pipe or fuel pipe is insufficient, the air pressure inside the mixing chamber is low. At this time, the position of the baffle will close the pipelines of the powder feeding pipe and the air inlet pipe, and the powder feeding pipe cannot transport powder.

A feeding channel is provided inside the gun rod, and both the mixing chamber and the feeding chamber are connected with the feeding channel.

After the gas transported in the air inlet pipe transports the powder transported by the powder feeding pipe to the feeding channel, the oxygen and gaseous fuel are mixed with the gas and powder in the feeding channel. After the gaseous fuel is ignited, the powder will be heated at high temperature. , and then spray the heated and melted powder on the surface of the workpiece to be sprayed.

Further, a trigger plate 2 is installed inside the fuel pipe. The trigger plate 2 is installed inside the fuel pipe to rotate along the axis direction. A blocking plate 2 is installed inside the oxygen pipe. The blocking plate 2 is installed in a radial sliding manner. The blocking plate two is located on the side of the triggering plate one close to the mixing chamber, and the triggering plate two is located on the side of the blocking plate one close to the mixing chamber;

When the fuel pipe transports fuel airflow, the airflow can push the trigger plate 2 to rotate, and the trigger plate 2 will linkage the blocking plate 2 to move, so that the blocking plate 2 is separated from the oxygen pipe. When there is no gas in the fuel pipe When fuel is transported, the trigger plate 2 does not rotate, the blocking plate 2 and the oxygen pipe are in a matching state, and the pipeline inside the oxygen pipe is closed. At this time, the oxygen pipe cannot be used to transport oxygen into the mixing chamber.

Furthermore, the trigger plate one and the blocking plate one and the trigger plate two and the blocking plate two are connected by a pull rope, and the oxygen pipe and the fuel pipe are equipped with fixed positioning for guide ropes inside. Pulley, when the air flow pushes the trigger plate one or the trigger plate two to rotate, the pull rope pulls the corresponding blocking plate one or the blocking plate two to slide along the radial direction of the oxygen pipe or fuel pipe;

Compression springs are provided between the first and second blocking plates and the inner wall of the gun seat. The compression springs are used to reset the blocking plates one or two. The blocking plates one and two are close to the Balls are installed in the inner wall of the slideway on one side of the mixing chamber to reduce the frictional resistance of blocking plate one or blocking plate two when sliding.

Further, two through holes are provided on the surface of the baffle, and the two through holes are respectively adapted to the powder feeding pipe and the air inlet pipe. When the baffle slides, the two through holes simultaneously Separate or cooperate with the powder feeding pipe and air inlet pipe;

A cylinder is installed inside the gun seat, and a piston rod is installed in a sealing and sliding manner inside the cylinder. The piston rod is fixedly connected to the baffle, and a return spring is provided between the piston plate of the piston rod and the cylinder. The space inside the cylinder on one side of the piston plate communicates with the mixing chamber.

The air pressure in the mixing chamber is used in conjunction with the return spring to control the position of the piston rod, and then the position of the baffle. By controlling the position of the baffle, the opening and closing of the internal channels of the powder feeding pipe and the air inlet pipe can be adjusted.

Further, a pressure stabilizing chamber is provided on the upper side of the mixing chamber, and a pressure valve is installed between the pressure stabilizing chamber and the mixing chamber;

A mixing plate 2 is installed and slidably sealed inside the mixing chamber. A spring is provided between the mixing plate 2 and the inner wall of the mixing chamber for resetting the mixing plate 2. A mixing plate 1 is fixedly installed inside the mixing chamber. The mixing plate one and the mixing plate two are respectively located on both sides of the pressure valve;

The fuel pipe is connected to the space on the side of the mixing plate one away from the mixing plate two. The gaseous fuel transported by the fuel pipe is transported into this space. The oxygen pipe and the mixing plate two are far away from the mixing plate. The space on one side is connected, and the oxygen transported by the oxygen pipe is transported to this space. Several conduits are installed on the surface of the mixing plate one. The conduits penetrate the mixing plate two. The conduits extend to the mixing plate two away from the mixing plate. There are pores on the surface of the tube body in the space on one side of the plate, which can increase the diffusion range of gaseous fuel in the space where oxygen is located, which is beneficial to improving the mixing effect of gaseous fuel and oxygen. The gaseous fuel on one side of the mixing plate is transported through the conduit. to the space on the side of mixing plate two away from mixing plate one, and mix with oxygen;

A number of through pipes are installed inside the mixing plate two. The through pipes extend into the space between the mixing plate one and the mixing plate two. The mixing plate two moves toward the mixing plate under the action of air pressure. When plate one slides in the direction, the channel inside the pipe is opened.

The gaseous fuel is transported to the space where the oxygen is located through the conduit and mixed with the oxygen. At this time, when the air pressure in the space on the side of the mixing plate one and the mixing plate two away from the pressure valve increases to the set threshold, the air pressure of the mixing plate two is Under the action of the pressure valve, the sliding of the mixing plate 2 triggers the opening of the through pipe. After the through pipe is opened, the gas after the oxygen and gaseous fuel are mixed enters the space where the lower end of the pressure valve is, and enters the stabilized pressure through the pressure valve. in the cavity.

Further, a plurality of push rods are fixedly installed on the surface of the mixing plate one side close to the mixing plate two, and the push rods correspond to the through pipes;

The inside of the through pipe is provided with a plug and a plug, and a spring is provided between the plug and the inner wall of the pipe for resetting the plug. When the mixing plate two slides in the direction of the mixing plate one, The ejector pin can push the blocking block to slide to separate the blocking block from the blocking opening.

Further, an annular cavity is provided inside the gun seat, the annular cavity is connected to the pressure stabilizing chamber through a connecting channel, and an air channel is provided between the cylinder and the connecting channel;

A plurality of gas pipes are provided between the annular cavity and the material conveying channel. After the gas mixed with oxygen and gaseous fuel enters the pressure stabilizing cavity, it will enter the annular cavity through the connecting channel, and then enter through the gas pipes. At the same time, a part of the mixed gas enters the cylinder through the air channel. The piston rod moves under the action of the internal air pressure of the cylinder and drives the baffle to slide, so that the two through holes on the surface of the baffle are connected with the powder feeding pipe and the inlet respectively. Tracheal fit.

Further, a feeding cylinder is fixedly installed inside the feeding chamber, and a feeding port is provided on the surface of the feeding cylinder. The powder feeding tube is connected to the feeding port and the powder feeding tube is used to transport the powder to the feeding chamber. in the barrel;

A feeding screw is installed in the inner rotation of the feeding barrel, and a transmission gear set is installed on the surface of the feeding screw. The gears in the transmission gear set are driven and rotated by a motor installed inside the gun seat. The rotation of the feeding screw is used to control the incoming material. The powder inside the barrel is transported, and the inside of the shaft of the feeding screw is a hollow tube, and the hollow tube is connected with the air inlet pipe;

A guide tube is rotatably installed inside the feeding tube. The guide tube is located on the side of the feeding screw away from the air inlet pipe. The guide tube is funnel-shaped and has a channel inside the guide tube. At the same time, it is connected with the hollow pipe and the material conveying channel;

Several guide plates are installed on the inner wall of the funnel-shaped end of the guide tube, and fan blades are fixedly installed inside the channel of the guide tube.

The feeding screw transports the powder to the inside of the guide barrel. When the air inlet pipe is connected to the air flow, the airflow drives the guide barrel to rotate through the fan blades. When the guide barrel rotates, under the guidance of the guide plate, the powder flows into the guide barrel. It slides in the axial direction, and as the airflow continues to flow, it continues to mix into the airflow.

The design of the feeding screw and guide barrel in the feeding chamber can realize uniform transportation of powder and facilitate the uniform mixing of powder in the gas.

Further, an annular heat dissipation cavity is provided inside the gun shaft, and a water inlet pipe and a water outlet pipe are installed on the outer surface of the gun shaft. Both the water inlet pipe and the water outlet pipe are connected with the heat dissipation cavity, and the water inlet pipe and the water outlet pipe are used to cooperate. , continuously add coolant to the heat dissipation cavity to cool down the gun barrel.

Further, a tapered nozzle is fixedly installed on the surface of the gun rod on the side away from the gun seat, and the feeding channel axially penetrates the nozzle. Oxygen, gaseous fuel and powder are mixed in the feeding channel. The gaseous fuel After being ignited, it is sprayed out from the nozzle, the powder is heated and melted, and the molten powder is sprayed on the surface of the workpiece to be sprayed.

Compared with the prior art, the present invention has the following beneficial effects:

1. This thermal spraying device can realize the linked transportation of oxygen and gaseous fuel by arranging trigger plate one, blocking plate two and trigger plate two and blocking plate one in the oxygen pipe and fuel pipe respectively. When one of the gases is interrupted, , promptly interrupt the delivery of another gas, and at the same time use the air pressure in the mixing chamber to control the relative position between the baffle, the powder feeding pipe and the air inlet pipe. When the delivery of oxygen or gaseous fuel is interrupted, the drop in air pressure inside the mixing chamber is used to Change the relative position between the baffle and the powder feed pipe and the air inlet pipe, and use the baffle to close the channels inside the powder feed pipe and the air inlet pipe, thereby avoiding the waste of powder and realizing the linked feeding and transportation of oxygen, gaseous fuel and powder. .

2. This thermal spraying device, through the combined design of the conduit and ejector on the first surface of the mixing plate in the mixing chamber and the second and through pipes of the mixing plate, can fully mix oxygen and gaseous fuel in the mixing chamber under pressure to improve the efficiency of oxygen and gas. The mixing effect of the fuel is conducive to improving the stability of gaseous fuel combustion and avoiding local deflagration in the flame.

3. This thermal spraying device, by arranging a feeding cylinder, feeding screw and guide cylinder in the feeding chamber, and through the matching design of the powder feeding tube and the feeding cylinder, the air inlet pipe and the feeding screw, can uniformly spray the powder Conveying, and can evenly mix the powder into the air flow of compressed air conveyed by the air inlet pipe, which is beneficial to improving the effect of powder feeding.

Description of the drawings

Figure 1 is a schematic structural diagram of the flame gun of the present invention;

Figure 2 is a perspective view of the internal structure of the flame gun of the present invention;

Figure 3 is a perspective view of the internal installation structure of the internal mixing chamber and feeding chamber of the flame gun of the present invention;

Figure 4 is a front view of the internal installation structure of the mixing chamber and feeding chamber of the flame gun of the present invention;

Figure 5 is a schematic diagram of the partial structure below the feeding chamber in Figure 4 of the present invention;

Figure 6 is a three-dimensional view of the surface structures of mixing plate one and mixing plate two according to the present invention;

Figure 7 is a front view of the surface structures of mixing plate one and mixing plate two according to the present invention;

Figure 8 is a perspective view of the internal structure of the feeding barrel in the feeding cavity of the present invention;

Figure 9 is a perspective view of the guide tube structure of the present invention;

Figure 10 is a schematic diagram of the upper part of the gun seat in Figure 4 of the present invention;

Figure 11 is a schematic diagram of the matching structure of the baffle, powder feeding pipe and air inlet pipe according to the present invention.

In the picture: 1. Gun seat; 2. Oxygen pipe; 3. Fuel pipe; 4. Trigger plate one; 41. Blocking plate one; 5. Trigger plate two; 51. Blocking plate two; 6. Pull rope; 61. Compression Spring; 7. Mixing chamber; 71. Mixing plate one; 711. Conduit; 712. Ejector; 72. Mixing plate two; 721. Pipe; 722. Block; 8. Stabilizing chamber; 81. Pressure valve; 9 , annular cavity; 91, connecting channel; 92, gas pipe; 10, gun rod; 101, feeding channel; 102, heat dissipation cavity; 11, nozzle; 12, feeding chamber; 121, feeding barrel; 1211, feeding port; 122. Feeding screw; 1221. Transmission gear set; 123. Guide cylinder; 1231. Guide plate; 1232. Fan blades; 13. Powder feeding pipe; 14. Air inlet pipe; 15. Baffle; 151. Piston rod; 152 , cylinder; 16. water inlet pipe; 17. water outlet pipe.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Examples of the thermal spray device are as follows:

Referring to Figures 1 to 11, a thermal spray device includes a flame gun. The flame gun includes a gun base 1, a gun rod 10 and an electronic igniter installed inside the gun rod 10. The bottom of the gun base 1 is provided with an oxygen tube 2 and fuel. Pipe 3. The pipe fitting for transporting oxygen is connected to the oxygen pipe 2. The pipe fitting for transporting gaseous fuel is connected to the fuel pipe 3. A mixing chamber 7 is provided inside the gun base 1. The upper ends of the oxygen pipe 2 and the fuel pipe 3 are both connected to the mixing chamber 7. , both oxygen and fuel are delivered to the mixing chamber 7 and mixed in the mixing chamber 7 .

A trigger plate 4 is installed inside the oxygen pipe 2. The trigger plate 4 is rotated and installed inside the oxygen pipe 2 along the axial direction. A blocking plate 41 is installed inside the fuel pipe 3. The blocking plate 41 is installed slidingly in the radial direction. When the oxygen pipe 2 delivers oxygen gas flow, the air flow can push the trigger plate 4 to rotate, and the trigger plate 4 will linkage the blocking plate 41 to move, so that the blocking plate 41 is separated from the fuel pipe 3.

A trigger plate 2 5 is installed inside the fuel pipe 3. The trigger plate 2 5 is installed inside the fuel pipe 3 to rotate along the axial direction. A blocking plate 2 51 is installed inside the oxygen pipe 2. The blocking plate 2 51 is installed to slide radially. The second plate 51 is located on the side of the trigger plate 1 4 close to the mixing chamber 7, and the trigger plate 5 is located on the side of the blocking plate 1 41 close to the mixing chamber 7.

The trigger plate one 4 and the blocking plate one 41 and the trigger plate two 5 and the blocking plate two 51 are connected by a pull rope 6, and the oxygen pipe 2 and the fuel pipe 3 are both equipped with fixed pulleys for guiding the pull rope 6. , when the airflow pushes the trigger plate one 4 or the trigger plate two 5 to rotate, the pull rope 6 pulls the corresponding blocking plate one 41 or the blocking plate two 51 to slide along the radial direction of the oxygen pipe 2 or the fuel pipe 3 .

A compression spring 61 is provided between the blocking plate one 41 and the blocking plate two 51 and the inner wall of the gun seat 1. The compression spring 61 is used to reset the blocking plate one 41 or the blocking plate two 51. The blocking plate one 41 and the blocking plate two 51 Balls are installed in the inner wall of the slideway close to the side of the mixing chamber 7 to reduce the frictional resistance of the first blocking plate 41 or the second blocking plate 51 when sliding.

When the fuel pipe 3 delivers fuel airflow, the airflow can push the trigger plate 2 5 to rotate, and the trigger plate 2 5 is linked to drive the blocking plate 2 51 to move, so that the blocking plate 2 51 is separated from the oxygen pipe 2. When there is no oxygen in the oxygen pipe 2, The trigger plate 4 does not rotate, the blocking plate 41 and the fuel pipe 3 are in a matching state, and the pipeline inside the fuel pipe 3 is in a closed state. At this time, the fuel pipe 3 cannot be used to transport gaseous fuel to the mixing chamber 7. When the fuel When there is no gaseous fuel to be transported in the tube 3, the trigger plate 2 5 does not rotate, the blocking plate 2 51 and the oxygen tube 2 are in a matching state, and the pipeline inside the oxygen tube 2 is closed. At this time, the oxygen tube 2 cannot be used to transport oxygen. into the mixing chamber 7.

A pressure stabilizing chamber 8 is provided on the upper side of the mixing chamber 7, and a pressure valve 81 is installed between the pressure stabilizing chamber 8 and the mixing chamber 7; a mixing plate 72 is installed in the internal seal of the mixing chamber 7, and the mixing plate 72 is connected to the mixing chamber. A spring is provided between the inner walls of the mixing chamber 7 for resetting the second mixing plate 72. A mixing plate 71 is fixedly installed inside the mixing chamber 7. The first mixing plate 71 and the second mixing plate 72 are located on both sides of the pressure valve 81 respectively.

The fuel pipe 3 is connected to the space on the side of the mixing plate one 71 away from the mixing plate two 72. The gaseous fuel transported by the fuel pipe 3 is transported to this space. The oxygen pipe 2 and the mixing plate two 72 are away from the space on the side of the mixing plate one 71. connected, the oxygen transported by the oxygen pipe 2 is transported to this space. Several conduits 711 are installed on the surface of the mixing plate one 71. The conduits 711 penetrate the mixing plate two 72. The conduits 711 extend to the mixing plate two 72 away from the mixing plate one 71. There are pores on the surface of the tube body in the space on the side, which can increase the diffusion range of the gaseous fuel in the space where the oxygen is, which is beneficial to improving the mixing effect of the gaseous fuel and oxygen. The gaseous fuel on one side of the mixing plate 71 is transported to the Mixing plate two 72 is in the space on one side away from mixing plate one 71, and is mixed with oxygen.

A number of through pipes 721 are installed inside the mixing plate two 72. The through pipes 721 extend into the space between the mixing plate one 71 and the mixing plate two 72. The mixing plate two 72 slides in the direction of the mixing plate one 71 under the action of air pressure. When , the channel inside the pipe 721 is opened.

The gaseous fuel is transported to the space where the oxygen is located through the conduit 711 and mixed with the oxygen. As the fuel gas and oxygen in the mixing chamber 7 continue to increase, the air pressure in the mixing chamber 7 continues to increase. When the mixing plate 71 and the mixing When the air pressure in the space on the side of the second plate 72 away from the pressure valve 81 increases to the set threshold, the second mixing plate 72 slides in the direction of the pressure valve 81 under the action of air pressure. The sliding of the second mixing plate 72 triggers the opening of the through pipe 721, and the passage After the pipe 721 is opened, the gas mixed with oxygen and gaseous fuel enters the space where the lower end of the pressure valve 81 is located, and enters the pressure stabilizing chamber 8 through the pressure valve 81 .

Several ejector pins 712 are fixedly installed on the surface of the first mixing plate 71 close to the second mixing plate 72. The ejector pins 712 correspond to the through pipes 721; the through pipes 721 are provided with plugs and blocking blocks 722 inside, and the blocking blocks 722 and A spring is provided between the inner walls of the pipe 721 for resetting the blocking block 722. When the second mixing plate 72 slides in the direction of the first mixing plate 71, the push rod 712 can push the blocking block 722 to slide, so that the blocking block 722 is in contact with the blocking opening. separation.

An annular cavity 9 is provided inside the gun seat 1, and the annular cavity 9 is connected with the pressure stabilizing chamber 8 through a connecting channel 91.

The side surface of the gun base 1 is provided with a powder feeding pipe 13 and an air inlet pipe 14. The inside of the gun base 1 is provided with a feeding cavity 12. The powder feeding pipe 13 and the air inlet pipe 14 are both connected with the inside of the feeding cavity 12. The inside of the gun shaft 10 is provided with There is a feeding channel 101. The ignition end of the electronic igniter is located inside the feeding channel 101. The mixing chamber 7 and the feeding chamber 12 are both connected to the feeding channel 101.

A plurality of gas delivery pipes 92 are provided between the annular chamber 9 and the material conveying channel 101. After the gas mixed with oxygen and gaseous fuel enters the pressure stabilizing chamber 8, it will enter the annular cavity 9 through the connecting channel 91, and then pass through the conveying channel 91. The air pipe 92 enters the material conveying channel 101.

A baffle 15 is slidably installed in the radial direction of the powder feeding pipe 13 and the air inlet pipe 14 at the same time. The air pressure in the mixing chamber 7 is used to control the position of the baffle 15. The sliding movement of the baffle 15 is used to control the powder feeding pipe 13 and the air inlet pipe. 14. Opening and closing of internal pipelines.

There are two through holes on the surface of the baffle 15. The two through holes are respectively adapted to the powder feeding pipe 13 and the air inlet pipe 14. When the baffle 15 slides, the two through holes are connected to the powder feeding pipe 13 and the air inlet pipe 14 at the same time. Separate or fit.

A cylinder 152 is installed inside the gun base 1, and an air passage is provided between the cylinder 152 and the connecting channel 91. A piston rod 151 is installed in a sealed and sliding manner inside the cylinder 152. The piston rod 151 is fixedly connected to the baffle 15, and the piston of the piston rod 151 There is a return spring between the plate and the cylinder 152. The space inside the cylinder 152 on one side of the piston plate is connected with the mixing chamber 7. The air pressure in the mixing chamber 7 is used to cooperate with the return spring to control the position of the piston rod 151 and then control the baffle. 15, part of the mixed gas entering the connecting channel 91 enters the cylinder 152 through the air channel. The piston rod 151 moves under the action of the internal air pressure of the cylinder 152 and drives the baffle 15 to slide, causing the two passages on the surface of the baffle 15 to slide. The holes are matched with the powder feeding pipe 13 and the air inlet pipe 14 respectively.

When the gas delivered by the oxygen pipe 2 or the fuel pipe 3 is insufficient, the air pressure inside the mixing chamber 7 is low. At this time, the position of the baffle 15 will close the powder feeding pipe 13 and the air inlet pipe 14, and the powder feeding pipe 13 cannot Conveying powder.

A feeding cylinder 121 is fixedly installed inside the feeding chamber 12. A feeding port 1211 is provided on the surface of the feeding cylinder 121. The powder feeding tube 13 is connected to the feeding port 1211 and the powder feeding tube 13 is used to transport powder to the feeding cylinder 121. .

A feeding screw 122 is installed for rotation inside the feeding barrel 121, and a transmission gear set 1221 is installed on the surface of the feeding screw 122. The gears in the transmission gear set 1221 are driven and rotated by a motor installed inside the gun base 1, and the rotation of the feeding screw 122 is used. , to transport the powder entering the inside of the feeding barrel 121, the inside of the shaft of the feeding screw 122 is a hollow tube, and the hollow tube is connected with the air inlet pipe 14.

A guide tube 123 is installed inside the feeding barrel 121. The guide tube 123 is located on the side of the feeding screw 122 away from the air inlet pipe 14. The guide tube 123 is funnel-shaped, and the channel inside the guide tube 123 is connected to the hollow tube at the same time. It is connected with the conveying channel 101; several guide plates 1231 are installed on the inner wall of the funnel-shaped end of the guide tube 123, and fan blades 1232 are fixedly installed inside the channel of the guide tube 123.

The feeding screw 122 transports the powder to the inside of the guide barrel 123. When the air inlet pipe 14 is connected to the air flow, the airflow drives the guide barrel 123 to rotate through the fan blades 1232. When the guide barrel 123 rotates, the guiding plate 1231 plays a guiding role. Down, the powder slides in the axial direction of the guide barrel 123, and as the air flow continues to flow, it is continuously mixed into the air flow. The design of the feeding screw 122 and the guide barrel 123 in the feeding chamber 12 can achieve uniform transportation of the powder. It is convenient to mix the powder evenly in the gas.

An annular heat dissipation cavity 102 is provided inside the gun barrel 10. A water inlet pipe 16 and a water outlet pipe 17 are installed on the outer surface of the gun barrel 10. Both the water inlet pipe 16 and the water outlet pipe 17 are connected with the heat dissipation cavity 102. The water inlet pipe 16 is used to cooperate with the water outlet pipe 17. Coolant is continuously added to the heat dissipation cavity 102 to cool down the gun barrel 10 .

After the gas transported in the air inlet pipe 14 transports the powder transported by the powder feeding pipe 13 to the feeding channel 101, the gas and powder after the oxygen and gaseous fuel are mixed are mixed in the feeding channel 101. After the gaseous fuel is ignited, it will The powder is heated at high temperature, and then the heated and melted powder is sprayed on the surface of the workpiece to be sprayed.

A cone-shaped nozzle 11 is fixedly installed on the surface of the gun rod 10 on the side away from the gun seat 1. The feeding channel 101 axially penetrates the nozzle 11. Oxygen, gaseous fuel and powder are mixed in the feeding channel 101. The gaseous fuel is ignited and ejects from the nozzle. Spray out at 11 points, heat and melt the powder, and spray the molten powder on the surface of the workpiece to be sprayed.

Thermal spray device working principle:

Connect the pipe fitting for transporting oxygen to the oxygen pipe 2, connect the pipe fitting for transporting gaseous fuel to the fuel pipe 3, connect the pipe fitting for transporting powder to the powder feeding pipe 13, connect the compressed air pipe fitting to the air inlet pipe 14, and both oxygen and gaseous fuel are connected. After being transported to the mixing chamber 7, the gaseous fuel enters the space on the side of the second mixing plate 72 away from the first mixing plate 71 through the conduit 711, and is mixed with oxygen.

When the air pressure in the space on the side of the first mixing plate 71 and the second mixing plate 72 away from the pressure valve 81 increases to the set threshold, the second mixing plate 72 slides in the direction of the pressure valve 81 under the action of air pressure, and the second mixing plate 72 drives the passage The tube 721 moves together, and when the push rod 712 enters the inside of the through tube 721, it will contact the blocking block 722 and push the blocking block 722 to move, so that the blocking block 722 is separated from the blocking opening. At this time, the spaces on both sides of the mixing plate 72 are connected. The gas after oxygen and gaseous fuel are mixed enters the space where the lower end of the pressure valve 81 is located, and enters the pressure stabilizing chamber 8 through the pressure valve 81 .

After the gas mixed with oxygen and gaseous fuel enters the pressure stabilizing chamber 8, it enters the annular chamber 9 through the connecting channel 91, and then enters the feeding channel 101 through the gas transmission pipe 92. At the same time, a part of the mixed gas enters through the air channel. In the cylinder 152, the piston rod 151 moves under the action of the internal air pressure of the cylinder 152, and drives the baffle 15 to slide, so that the two through holes on the surface of the baffle 15 cooperate with the powder feeding pipe 13 and the air inlet pipe 14 respectively.

The powder feeding pipe 13 transports the powder to the feeding cylinder 121. The motor drives the feeding screw 122 to rotate. The feeding screw 122 transports the powder to the feeding cylinder 123. When the air inlet pipe 14 is connected to the air flow, the air flow is driven by the fan blades 1232. The guide tube 123 rotates. When the guide tube 123 rotates, under the guiding action of the guide plate 1231, the powder slides in the axial direction of the guide tube 123, and as the air flow continues to flow, it continues to mix into the air flow.

Oxygen, gaseous fuel and powder are mixed in the feeding channel 101. The gaseous fuel is ignited and sprayed from the nozzle 11, and the powder is heated and melted, and the molten powder is sprayed on the surface of the workpiece to be sprayed.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, and substitutions can be made to these embodiments without departing from the principles and spirit of the invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (8)

1. A thermal spraying device comprising a flame gun comprising a gun holder (1), a gun rod (10) and an electronic igniter mounted inside the gun rod (10), characterized in that: the oxygen pipe (2) and the fuel pipe (3) are arranged at the bottom of the gun seat (1), a mixing cavity (7) is arranged in the gun seat (1), and the upper ends of the oxygen pipe (2) and the fuel pipe (3) are communicated with the mixing cavity (7);

a first trigger plate (4) is arranged in the oxygen pipe (2), and a first blocking plate (41) is arranged in the fuel pipe (3);

when the oxygen pipe (2) conveys oxygen flow, the flow can push the first trigger plate (4) to rotate, and the first trigger plate (4) is linked to drive the first blocking plate (41) to move so as to separate the first blocking plate (41) from the fuel pipe (3);

the powder feeding device is characterized in that a powder feeding pipe (13) and an air inlet pipe (14) are arranged on the side surface of the gun seat (1), a feeding cavity (12) is arranged in the gun seat (1), the powder feeding pipe (13) and the air inlet pipe (14) are communicated with the inside of the feeding cavity (12), a baffle plate (15) is simultaneously and slidably arranged in the radial direction of the powder feeding pipe (13) and the air inlet pipe (14), the position of the baffle plate (15) is controlled by the air pressure in the mixing cavity (7), and the opening and closing of the inner pipelines of the powder feeding pipe (13) and the air inlet pipe (14) are controlled by the sliding of the baffle plate (15);

a material conveying channel (101) is arranged in the gun rod (10), and the mixing cavity (7) and the material conveying cavity (12) are communicated with the material conveying channel (101);

a second trigger plate (5) is arranged in the fuel pipe (3), a second blocking plate (51) is arranged in the oxygen pipe (2), the second blocking plate (51) is positioned on one side, close to the mixing cavity (7), of the first trigger plate (4), and the second trigger plate (5) is positioned on one side, close to the mixing cavity (7), of the first blocking plate (41);

when the fuel pipe (3) conveys fuel gas flow, the gas flow can push the second trigger plate (5) to rotate, and the second trigger plate (5) is linked to drive the second blocking plate (51) to move so as to separate the second blocking plate (51) from the oxygen pipe (2);

two through holes are formed in the surface of the baffle plate (15), the two through holes are respectively matched with the powder feeding pipe (13) and the air inlet pipe (14), and when the baffle plate (15) slides, the two through holes are simultaneously separated from or matched with the powder feeding pipe (13) and the air inlet pipe (14);

the gun seat is characterized in that an air cylinder (152) is arranged in the gun seat (1), a piston rod (151) is arranged in the air cylinder (152) in a sealing sliding manner, the piston rod (151) is fixedly connected with the baffle plate (15), a reset spring is arranged between a piston plate of the piston rod (151) and the air cylinder (152), and a space inside the air cylinder (152) at one side of the piston plate is communicated with the mixing cavity (7).

2. The thermal spray device of claim 1, wherein: the first trigger plate (4) and the first blocking plate (41) and the second trigger plate (5) and the second blocking plate (51) are connected through a pull rope (6), and when the first trigger plate (4) or the second trigger plate (5) is pushed by air flow to rotate, the pull rope (6) pulls the corresponding first blocking plate (41) or the second blocking plate (51) to slide along the radial direction of the oxygen pipe (2) or the fuel pipe (3);

compression springs (61) are arranged between the first blocking plate (41) and the second blocking plate (51) and the inner wall of the gun seat (1), and balls are arranged in the inner walls of the sliding ways, which are close to one side of the mixing cavity (7), of the first blocking plate (41) and the second blocking plate (51).

3. The thermal spray device of claim 1, wherein: the upper side of the mixing cavity (7) is provided with a pressure stabilizing cavity (8), and a pressure valve (81) is arranged between the pressure stabilizing cavity (8) and the mixing cavity (7);

the inside of the mixing cavity (7) is hermetically and slidably provided with a mixing plate II (72), a mixing plate I (71) is fixedly arranged in the mixing cavity (7), and the mixing plate I (71) and the mixing plate II (72) are respectively positioned at two sides of the pressure valve (81);

the fuel pipe (3) is communicated with the space of the side, far away from the mixing plate II (72), of the mixing plate I (71), the oxygen pipe (2) is communicated with the space of the side, far away from the mixing plate I (71), of the mixing plate II (72), a plurality of guide pipes (711) are arranged on the surface of the mixing plate I (71), and the guide pipes (711) penetrate through the mixing plate II (72);

the inside of the mixing plate II (72) is provided with a plurality of through pipes (721), the through pipes (721) extend into the space between the mixing plate I (71) and the mixing plate II (72), and when the mixing plate II (72) slides towards the mixing plate I (71) under the action of air pressure, the channels inside the through pipes (721) are opened.

4. A thermal spray apparatus as claimed in claim 3, wherein: a plurality of ejector rods (712) are fixedly arranged on the surface of the first mixing plate (71) close to one side of the second mixing plate (72), and the ejector rods (712) correspond to the through pipes (721);

and a blocking mouth and a blocking block (722) are arranged in the through pipe (721), and when the second mixing plate (72) slides towards the first mixing plate (71), the ejector rod (712) can push the blocking block (722) to slide so as to separate the blocking block (722) from the blocking mouth.

5. A thermal spray apparatus as claimed in claim 3, wherein: an annular cavity (9) is formed in the gun seat (1), the annular cavity (9) is communicated with the pressure stabilizing cavity (8) through a connecting channel (91), and an air passage is formed between the air cylinder (152) and the connecting channel (91);

a plurality of air delivery pipes (92) are arranged between the annular cavity (9) and the material delivery channel (101).

6. The thermal spray device of any one of claims 1-5, wherein: a feeding barrel (121) is fixedly arranged in the feeding cavity (12), a feeding hole (1211) is formed in the surface of the feeding barrel (121), and the powder feeding pipe (13) is connected with the feeding hole (1211);

a feeding screw (122) is rotatably arranged in the feeding barrel (121), a hollow pipe is arranged in a shaft lever of the feeding screw (122), and the hollow pipe is communicated with the air inlet pipe (14);

a guide cylinder (123) is rotatably arranged in the material conveying cylinder (121), the guide cylinder (123) is positioned at one side of the material conveying screw (122) away from the air inlet pipe (14), the guide cylinder (123) is funnel-shaped, and a channel in the guide cylinder (123) is simultaneously communicated with the hollow pipe and the material conveying channel (101);

the inner wall of the funnel-shaped end of the guide cylinder (123) is provided with a plurality of guide plates (1231), and the inside of a channel of the guide cylinder (123) is fixedly provided with fan blades (1232).

7. The thermal spray device of claim 6, wherein: annular heat dissipation cavity (102) has been seted up to stock (10) inside, the surface mounting of stock (10) has inlet tube (16) and outlet pipe (17), inlet tube (16) and outlet pipe (17) all with heat dissipation cavity (102) intercommunication.

8. The thermal spray device of claim 7, wherein: the surface of the gun rod (10) far away from one side of the gun seat (1) is fixedly provided with a conical nozzle (11), and the material conveying channel (101) axially penetrates through the nozzle (11).