Spray gun head with multi-state switching function and flame spray gun

Abstract

The utility model discloses a spray gun head with a multi-state switching function and a flame spray gun, relates to the technical field of flame spray guns, and solves the problems that the flame spray gun is non-uniform in combustion oxygen mixing and cannot automatically close a combustion oxygen channel. The spray gun head with the multi-state switching function comprises a gun head shell provided with a discharging channel and an air chamber which are communicated with each other, a fuel gas channel, an oxygen channel and an air channel which are communicated with the air chamber are arranged in the gun head shell, and the spray gun head further comprises a state control mechanism for controlling the gun head to achieve multi-state switching. The state control mechanism comprises a control valve element capable of rotating to an initial station, an air-fuel station and a working station along the axis of the state control mechanism, and the control valve element is arranged on a fuel gas channel, an oxygen channel and an air channel of the gun head shell. At the initial station, the fuel gas channel, the oxygen channel and the air channel are all disconnected from the gas chamber; in the air-fuel station, only the fuel gas channel and the oxygen channel are communicated with the gas chamber; and the working station, the fuel gas channel, the oxygen channel and the air channel are all communicated with the gas chamber.

Description

Technical Field

[0001] The utility model relates to the technical field of flame spray guns, in particular to a spray gun head with a multi-state switching function and a flame spray gun. Background Art

[0002] The spraying tools currently used on the market are roughly divided into flame spraying and plasma spraying.

[0003] Plasma spraying is a spraying technology that uses plasma arc as a heat source to melt solid materials such as metals and ceramics and spray them onto the surface of the processed object. However, the coating thickness is relatively thin, it cannot be sprayed on a large area, and the cost of use is high, and it requires a high level of operating technology.

[0004] Flame spraying uses methane, oxygen and other gases to generate high temperatures to melt solid materials, and then sprays the melted materials onto the surface of the object being processed with compressed gas. This spraying method has low cost, low operating technology requirements, fast spraying speed, high spraying quality and reliable thickness.

[0005] The flame spraying tools on the market usually include an integrated gun head and gun body, which are troublesome to maintain and difficult to replace parts. In addition, the current flame spraying tools usually only have an off state and a working state: the working state is: after turning on the switch, gas, oxygen and spraying materials are supplied at the same time to carry out the spraying work, but once the machine is turned on, gas, oxygen and spraying materials are supplied at the same time, and there is an uneven mixing of gas and oxygen, resulting in incomplete melting of solid materials, making it easy for small unmelted nodes to appear during the spraying process, affecting the spraying quality. At the same time, the existing common flame spraying tools have another defect: after the operator turns on its working state, it is in the working state regardless of whether the operator holds the spraying tool, and there is no function to automatically shut down its working state. Without the supervision of the operator, the continuous supply of mixed gas and oxygen is dangerous.

[0006] Based on this, the inventor has designed a spray gun head and a flame spray gun with a multi-state switching function on the original basis to solve at least one of the above problems, and thus proposed the present application. Utility Model Content

[0007] The purpose of this application is to provide a spray gun head and a flame spray gun with a multi-state switching function to solve the problems that the current flame spray tools have no standby state, uneven fuel-oxygen mixing, and cannot spontaneously close the fuel-oxygen channel, which poses a certain risk.

[0008] In order to solve the above technical problems, the utility model adopts the following solutions:

[0009] The present application discloses a spray gun head with a multi-state switching function, comprising a gun head housing with a discharge channel and an air chamber provided therein, the discharge channel and the air chamber being connected, a gas channel, an oxygen channel and an air channel connected to the air chamber being provided in the gun head housing, and a state control mechanism for controlling the gun head to realize multi-state switching, the state control mechanism comprising a control valve core which can rotate along its axis to an initial position, an air-fuel position and a working position, and the control valve core is arranged on the gas channel, the oxygen channel and the air channel of the gun head housing;

[0010] At the initial position, the gas channel, oxygen channel and air channel are disconnected from the gas chamber;

[0011] In the air-fuel position, only the fuel gas channel and the oxygen channel are connected to the gas chamber;

[0012] At the working station, the fuel gas channel, the oxygen channel and the air channel are all connected with the gas chamber.

[0013] Preferably, the control valve core is provided with an in-core gas passage, an in-core oxygen passage, an in-core air passage arranged side by side and at intervals, and a first mixed gas passage and a second mixed gas passage respectively connected to the in-core gas passage and the in-core oxygen passage, wherein:

[0014] At the initial position, the gas channel is disconnected from the gas channel in the core and the first mixed gas channel, the oxygen channel is disconnected from the oxygen channel in the core and the second mixed gas channel, and the air channel in the core is disconnected from the air channel;

[0015] In the air-fuel position, the first mixed gas channel and the second mixed gas channel are connected to the gas channel and the oxygen channel respectively, and the oxygen channel in the core and the gas channel in the core, as well as the air channel in the core are disconnected from the gas channel, the oxygen channel and the air channel respectively;

[0016] At the working station, the gas channel, oxygen channel and air channel in the core are connected with the gas channel, oxygen channel and air channel respectively, and the first mixed gas channel and the second mixed gas channel are disconnected with the gas channel and oxygen channel respectively.

[0017] Preferably, the control valve core is an integrated valve core;

[0018] The connecting line of the gas inlet and outlet ports of the gas channel in the core and the connecting line of the gas inlet and outlet ports of the oxygen channel in the core are parallel to each other;

[0019] The inlet and outlet ports of the first mixed gas passage are respectively located on the same longitudinal section of the control valve core as the inlet and outlet ports of the gas passage in the core;

[0020] The inlet and outlet ports of the second mixed gas passage are respectively located on the same longitudinal section of the control valve core as the inlet and outlet ports of the oxygen passage in the core;

[0021] The air passage in the core comprises a long axis passage whose two port connection lines are parallel to the inlet and outlet port connection lines of the gas passage in the core.

[0022] Preferably, the air channel in the core further includes a short axis channel which is in a straight line and connected to the long axis channel, and the long axis channel and the short axis channel after being connected are in a T shape;

[0023] The gun head housing is also provided with an air outlet passage for communicating with the air inlet passage of the gun body;

[0024] At the initial station and the working station, the external compressed air is in communication with the air outlet passage through the air passage in the core.

[0025] Preferably, the long axis channels of the core gas channel, the core oxygen channel, the first mixed gas channel, the second mixed gas channel and the core air channel are all in a straight line shape;

[0026] The included angle between the axes of the first mixed gas passage and the second mixed gas passage after being connected with the fuel gas passage and the oxygen passage in the core respectively is an acute angle or an obtuse angle.

[0027] Preferably, at least two of the first mixing air passages and the second mixing air passages are provided, and the two or more first mixing air passages and the second mixing air passages are evenly distributed along the circumference of the control valve core;

[0028] The channel cross-sectional areas of the first mixed gas channel and the second mixed gas channel are both smaller than the channel cross-sectional areas of the in-core fuel gas channel and the in-core oxygen channel.

[0029] Preferably, the state control mechanism further includes a rebound component for driving the control valve core to rotate from the working position to the initial position, and the rebound component includes:

[0030] A rebound torsion spring and a rebound shell are mounted on the control valve core, and a valve core end cover is fixed to the end of the control valve core. The valve core end cover is fixedly connected to the rebound shell, and the rebound shell is rotatably connected to the gun head shell. One end of the rebound torsion spring is clamped on the rebound shell, and the other end is clamped on the gun head shell.

[0031] Preferably, it also includes a safety buckle rotatably connected to the gun head housing, and a switch wrench fixedly connected to the safety buckle, and the rotation axis of the safety buckle and the gun head housing is arranged parallel to the control valve core;

[0032] One end of the safety buckle away from the switch wrench is transmission connected with the rebound housing.

[0033] Preferably, the state control mechanism also includes a control wrench fixedly connected to the control valve core.

[0034] Preferably, a forward convex structure is further provided at the bottom of the gun head housing, and a support tube is provided at the bottom of the forward convex structure.

[0035] Preferably, a gas pipe connection seat for connecting an external gas pipe, an oxygen pipe, and a compressed air pipe is also provided, and the gas pipe connection seat is detachably arranged at the bottom of the gun head housing;

[0036] The gas pipe connecting seat comprises a gas connecting port, an oxygen connecting port and a compressed air connecting port which are respectively used to communicate with the gas channel, the oxygen channel and the air channel.

[0037] Another aspect of the present application provides a flame spray gun with a multi-state switching function, comprising any one of the above-mentioned spray gun heads with a multi-state switching function, and also comprising a gun body, the gun body being detachably connected to the gun head housing;

[0038] A discharge pipe is arranged in the gun head housing, a discharge channel is located in the discharge pipe, and an air chamber is located between the gun head housing and the discharge pipe;

[0039] It also includes a discharge pipe which is detachably connected to the discharge pipe. One end of the discharge pipe which is away from the discharge pipe extends into the gun body.

[0040] Beneficial effects of the utility model:

[0041] 1. The present application sets a state control mechanism, and the control valve core of the state control mechanism can be rotated to the initial position, the air-fuel position and the working position, so that the flame spray gun head of the present application has multiple states that can be switched and adjusted; when the control valve core is rotated to the air-fuel position, only the fuel gas channel and the oxygen channel are connected to the gas chamber, so the fuel gas and oxygen can enter the gas chamber to be fully mixed, fill the gas chamber and the discharge channel in advance, and can be ignited at the gun nozzle of the gun head to form an air-fuel state without melting of the sprayed solid material. Therefore, the nozzle of the present application adds an air-fuel state before the formal spraying working state on the original basis by setting the control valve core of the state control mechanism, thereby solving the problem of spraying particles caused by uneven fuel-oxygen mixing and substandard temperature rise in the initial stage of melting of the sprayed solid material.

[0042] Second, in the non-initial state, since the gas channel and the oxygen channel are in a connected state, there is a certain danger. However, the present application sets a rebound component, a safety buckle and a switch wrench, so that the use of the entire gun body and the state switching of the gun head can be coordinated and linked, ensuring that the flame spray gun of the present application can continuously supply oxygen and gas only when the staff continuously presses the switch wrench in their hands, which can further eliminate safety hazards.

[0043] 3. The gun head shell and the gun body of the present application are fixedly connected in a detachable manner, which reduces the difficulty of disassembling the gun head and the gun body, thereby reducing the difficulty of maintenance and parts replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the three-dimensional structure of Example 1 of the present application.

[0045] Figure 2 This is a schematic diagram of the three-dimensional structure from another viewing angle of Example 1 of the present application.

[0046] Figure 3 This is a schematic diagram of the cross-sectional structure of Example 1 of the present application.

[0047] Figure 4 This is a schematic diagram of the cross-sectional structure from another viewing angle of Example 1 of the present application.

[0048] Figure 5 It is a schematic diagram of the three-dimensional structure of the state control mechanism in Example 1 of the present application.

[0049] Figure 6 This is a schematic diagram of the three-dimensional structure of the control valve core in Example 1 of the present application.

[0050] Figure 7 This is a schematic diagram of the channel connection of the control valve core in three working positions in Example 1 of the present application.

[0051] Figure 8 This is a structural diagram of Example 2 of the present application.

[0052] Description of reference numerals: 1-gun head housing, 11-gun head connecting hole, 12-front convex structure, 121-support tube, 131-air outlet, 132-gas channel, 133-air channel, 134-oxygen channel, 21-control wrench, 22-control valve core, 221-gas channel in the core, 222-oxygen channel in the core, 223-air channel in the core, 224-first mixed gas channel, 225-second mixed gas channel, 31-air pipe connection seat, 311-gas connection port, 312-oxygen connection port, 313-compressed air connection port, 32-air pipe in the shell, 4-rebound assembly, 41-rebound torsion spring, 42-rebound shell, 43-valve core end cover, 51-switch wrench, 52-safety buckle, 6-gun nozzle, 7-discharge pipe, 8-discharge main pipe, 81-discharge channel, 801-air chamber, 9-gun body, 901-air inlet. DETAILED DESCRIPTION

[0053] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0054] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0055] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "open", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0057] Embodiment 1:

[0058] like Figures 1 to 7 As shown, this embodiment provides a spray gun head with a multi-state switching function, including a gun head housing 1 with a discharge channel 81 and an air chamber 801 provided therein, the discharge channel 81 and the air chamber 801 being communicated with, a gas channel 132, an oxygen channel 134 and an air channel 133 being communicated with the air chamber 801 being further provided in the gun head housing 1, and also including a state control mechanism for controlling the gun head to realize multi-state switching, the state control mechanism including a control valve core 22 which can rotate along its axis to an initial position, an air-fuel position and a working position, and the control valve core 22 is arranged on the gas channel 132, the oxygen channel 134 and the air channel 133 of the gun head housing 1;

[0059] In the initial position, the gas channel 132, the oxygen channel 134 and the air channel 133 are all disconnected from the gas chamber 801;

[0060] In the air-fuel position, only the fuel gas channel 132 and the oxygen channel 134 are connected to the gas chamber 801;

[0061] At the working station, the fuel gas channel 132 , the oxygen channel 134 and the air channel 133 are all connected to the gas chamber 801 .

[0062] In this embodiment, a state control mechanism is provided, and the control valve core 22 of the state control mechanism can be rotated to the initial position, the air-fuel position and the working position, so that the flame spray gun head of the present application has multiple states that can be switched and adjusted; when the control valve core 22 is rotated to the air-fuel position, only the gas channel 132 and the oxygen channel 134 are connected to the gas chamber 801, so the gas and oxygen can enter the gas chamber 801 to be fully mixed, fill the gas chamber 801 and the discharge channel 81 in advance, and can be ignited at the gun nozzle 6 of the gun head to form an air-fuel state without melting of the sprayed solid material;

[0063] After the air-fuel state of the gun nozzle 6 is maintained for a period of time and the fuel and oxygen are evenly mixed, the valve core 22 can be controlled to rotate to the working state. At this time, the spray solid material is continuously delivered to the gun head. After the spray solid material is fully melted at high temperature, it is accelerated and sprayed out under the pressure of compressed air, which is the spraying action.

[0064] Therefore, the nozzle of the present application adds an air-fuel state before the formal spraying working state on the basis of the original state by setting the control valve core 22 of the state control mechanism, thereby solving the problem of spraying particles caused by uneven mixing of fuel and oxygen and failure to meet the temperature rise standard in the initial stage of melting of sprayed solid materials.

[0065] There are three air chambers 801 in this embodiment, which are respectively connected to the gas channel 132, the oxygen channel 134 and the air channel 133, and are isolated from each other by sealing rings. The three air chambers 801 are all connected to the discharge channel 81, and the three air chambers 801 respectively connected to the gas channel 132, the oxygen channel 134 and the air channel 133 are distributed in sequence in the opposite direction of the traveling direction of the sprayed solid material.

[0066] In this embodiment, the control valve core 22 is provided with an inner core gas passage 221, an inner core oxygen passage 222, an inner core air passage 223, and a first mixed gas passage 224 and a second mixed gas passage 225 which are respectively connected to the inner core gas passage 221 and the inner core oxygen passage 222, wherein:

[0067] At the initial position, the gas channel 132 is disconnected from the gas channel 221 in the core and the first mixed gas channel 224, the oxygen channel 134 is disconnected from the oxygen channel 222 in the core and the second mixed gas channel 225, and the air channel 223 in the core is disconnected from the air channel 133;

[0068] In the air-fuel position, the first mixed gas channel 224 and the second mixed gas channel 225 are connected to the gas channel 132 and the oxygen channel 134 respectively, and the oxygen channel 222 in the core and the gas channel 221 in the core, as well as the air channel 223 in the core are disconnected from the gas channel 132, the oxygen channel 134 and the air channel 133 respectively;

[0069] At the working station, the gas channel 221, the oxygen channel 222 and the air channel 223 in the core are connected with the gas channel 132, the oxygen channel 134 and the air channel 133 respectively, and the first mixed gas channel 224 and the second mixed gas channel 225 are disconnected from the gas channel 132 and the oxygen channel 134 respectively.

[0070] In this embodiment, the in-core gas passage 221, in-core oxygen passage 222, and in-core air passage 223 of the control valve core 22 are independent gas passages. The in-core gas passage 221, in-core oxygen passage 222, and in-core air passage 223 are all arranged perpendicular to the axis of the control valve core 22. The first mixed gas passage 224 is connected to the in-core gas passage 221, and the second mixed gas passage 225 is connected to the in-core oxygen passage 222.

[0071] Specifically, in this embodiment, if Figure 6 As shown, the control valve core 22 is an integrated valve core;

[0072] The gas inlet and outlet ports of the gas channel 221 in the core and the gas inlet and outlet ports of the oxygen channel 222 in the core are connected to each other in parallel, so that the gas channel 221 in the core and the oxygen channel 222 in the core are connected or disconnected with the gas channel 132 and the oxygen channel 134 at the same time, ensuring that the gas channel 132 and the oxygen channel 134 are unblocked or blocked at the same time, and preventing the gas channel 132 or the oxygen channel 134 from being connected alone;

[0073] The inlet and outlet ports of the first mixed gas passage 224 are respectively located on the same longitudinal section of the control valve core 22 as the inlet and outlet ports of the in-core gas passage 221;

[0074] The inlet and outlet ports of the second mixed gas passage 225 are respectively located on the same longitudinal section of the control valve core 22 as the inlet and outlet ports of the oxygen passage 222 in the core;

[0075] The special position design of the first mixed gas channel 224 and the second mixed gas channel 225 makes it impossible for the first mixed gas channel 224 and the second mixed gas channel 225 to form a passage independently when the in-core gas channel 221 and the in-core oxygen channel 222 are connected with the gas channel 132 and the oxygen channel 134, and the in-core gas channel 221 and the in-core oxygen channel 222 are also unable to form a passage independently when the first mixed gas channel 224 and the second mixed gas channel 225 are connected with the gas channel 132 and the oxygen channel 134;

[0076] The air channel 223 in the core includes a long axis channel whose two port connection lines are respectively parallel to the inlet and outlet port connection lines of the gas channel 221 in the core. The long axis channel of the air channel 223 in the core is parallel to the inlet and outlet port connection lines of the gas channel 221 in the core, so that when the gas channel 221 in the core and the oxygen channel 222 in the core are connected to the gas channel 132 and the oxygen channel 134, the air channel 223 in the core is connected to the air channel 133.

[0077] Specifically, in this embodiment, the core air channel 223 further includes a short axis channel which is in a straight line and connected to the long axis channel, and the connected long axis channel and the short axis channel are in a T shape;

[0078] The gun head housing 1 is also provided with an air outlet 131 for communicating with the air inlet 901 of the gun body 9;

[0079] At the initial position and the working position, the external compressed air is in communication with the air outlet 131 through the air channel 223 in the core. Figure 7 As shown, a T-shaped inner core air passage 223 having three ports is provided, so that compressed air can enter the gun body 9 when the control valve core 22 is in the initial position and the working position.

[0080] Specifically, in this embodiment, the long axis channels of the core gas channel 221, the core oxygen channel 222, the first mixed gas channel 224, the second mixed gas channel 225 and the core air channel 223 are all in a straight line shape;

[0081] The included angle between the axes of the first mixed gas passage 224 and the second mixed gas passage 225 after they are connected with the gas passage 221 and the oxygen passage 222 in the core is an acute angle or an obtuse angle. In this embodiment, the included angle between the axes of the first mixed gas passage 224 and the second mixed gas passage 225 after they are connected with the gas passage 221 and the oxygen passage 222 in the core is an acute angle, which facilitates the rapid rotation of the control valve core 22 to reach its position.

[0082] Specifically, in this embodiment, if Figure 5 and Figure 6 As shown, at least two first mixing air passages 224 and second mixing air passages 225 are provided, and the two or more first mixing air passages 224 and second mixing air passages 225 are evenly distributed along the circumference of the control valve core 22;

[0083] The channel cross-sectional areas of the first mixed gas channel 224 and the second mixed gas channel 225 are both smaller than the channel cross-sectional areas of the core gas channel 221 and the core oxygen channel 222, which can avoid excessive gas flow and oxygen flow, and prevent the gas chamber 801 from being filled up too quickly and overflowing with fuel and oxygen, causing safety hazards.

[0084] Specifically, in this embodiment, the state control mechanism further includes a rebound component 4 for driving the control valve core 22 to rotate from the working position to the initial position, and the rebound component 4 includes:

[0085] A rebound torsion spring 41 and a rebound shell 42 are mounted on the control valve core 22, and a valve core end cover 43 is fixed to the end of the control valve core 22. The valve core end cover 43 is fixedly connected to the rebound shell 42. The rebound shell 42 is rotatably connected to the gun head shell 1. One end of the rebound torsion spring 41 is clamped on the rebound shell 42, and the other end is clamped on the gun head shell 1.

[0086] In the non-initial state, since the gas channel 132 and the oxygen channel 134 are in a connected state, there is a certain danger. However, the present application provides a rebound component 4, which can make the control valve core 22 return to the initial position when it is in a non-stressed state, disconnect the fuel and oxygen channels, and eliminate safety hazards.

[0087] Specifically, in this embodiment, it also includes a safety buckle 52 rotatably connected to the gun head housing 1, and a switch wrench 51 fixedly connected to the safety buckle 52, and the rotation axis of the safety buckle 52 and the gun head housing 1 is arranged parallel to the control valve core 22;

[0088] The end of the safety buckle 52 away from the switch wrench 51 is in transmission connection with the resilient housing 42. By providing the safety buckle 52 and the switch wrench 51, the use of the entire gun body 9 can be coordinated with the state switching of the gun head, ensuring that the flame spray gun of the present application can continuously supply oxygen and fuel gas only when the switch wrench 51 is continuously pressed in the hands of the staff, and the safety hazards are eliminated while the gun head is kept normal and easy to operate.

[0089] Specifically, in this embodiment, the state control mechanism further includes a control wrench 21 fixedly connected to the control valve core 22. By providing the control wrench 21, the control valve core 22 can be conveniently controlled. In this embodiment, a limit top post (not shown in the figure) is provided on the side of the gun head housing 1 facing the control wrench 21, and a card slot adapted to the limit top post is provided on the end surface of the control wrench 21 facing the gun head housing 1.

[0090] Specifically, in this embodiment, a forward convex structure 12 is further provided at the bottom of the gun head housing 1, and a support tube 121 is provided at the bottom of the forward convex structure 12. The support tube 121 is provided to facilitate the placement of the flame spray gun.

[0091] Specifically, in this embodiment, a gas pipe connection seat 31 for connecting an external gas pipe, an oxygen pipe, and a compressed air pipe is also provided, and the gas pipe connection seat 31 is detachably provided at the bottom of the gun head housing 1;

[0092] The gas pipe connection seat 31 includes a gas connection port 311, an oxygen connection port 312 and a compressed air connection port 313 respectively used to communicate with the gas channel 132, the oxygen channel 134 and the air channel 133. In this embodiment, three in-shell gas pipes 32 are respectively located on the gas channel 132, the oxygen channel 134 and the air channel 133, and the gas pipe connection seat 31 is connected thereto. In this embodiment, the gas pipe connection seat 31 is provided to facilitate the subsequent connection and installation with the external gas pipe, oxygen pipe, and compressed air pipe.

[0093] The fuel gas used in this embodiment is acetylene.

[0094] Embodiment 2:

[0095] On the basis of the above embodiment 1, this embodiment provides a flame spray gun with a multi-state switching function, comprising any one of the above described spray gun heads with a multi-state switching function, and also comprising a gun body 9, which is detachably connected to the gun head housing 1;

[0096] A discharge pipe 8 is arranged in the gun head housing 1, a discharge channel 81 is located in the discharge pipe 8, and an air chamber 801 is located between the gun head housing 1 and the discharge pipe 8;

[0097] The gun body 9 also includes a discharge pipe 7 detachably connected to the discharge pipe 8 , and one end of the discharge pipe 7 away from the discharge pipe 8 extends into the gun body 9 .

[0098] In this embodiment, a gun head connecting hole 11 for installing screws is provided on the gun head housing 1, and the gun head housing 1 and the gun body 9 are detachably fixedly connected by means of screws, so that the difficulty of disassembling the gun head and the gun body 9 is reduced, thereby reducing the difficulty of maintenance and parts replacement.

[0099] The gun body in this embodiment is an existing gun body and will not be described in detail here.

[0100] The rest of the structure of this embodiment is the same as that of the above-mentioned embodiment 1 and will not be described in detail here.

[0101] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A spray gun head with a multi-state switching function, comprising a gun head housing (1) with a discharge channel (81) and an air chamber (801) provided therein, the discharge channel (81) and the air chamber (801) being connected, and the gun head housing (1) is further provided with a gas channel (132), an oxygen channel (134) and an air channel (133) connected to the air chamber (801), characterized in that: It also includes a state control mechanism for controlling the gun head to achieve multi-state switching, the state control mechanism including a control valve core (22) that can rotate along its axis to an initial position, an air-fuel position, and a working position, the control valve core (22) being arranged on a fuel gas channel (132), an oxygen channel (134), and an air channel (133) of the gun head housing (1); At the initial position, the fuel gas channel (132), the oxygen channel (134) and the air channel (133) are all disconnected from the gas chamber (801); In the air-fuel position, only the fuel gas channel (132) and the oxygen channel (134) are connected to the gas chamber (801); At the working station, the fuel gas channel (132), the oxygen channel (134) and the air channel (133) are all connected to the gas chamber (801).

2. The spray gun head with multi-state switching function according to claim 1, characterized in that: The control valve core (22) is provided with an inner core gas passage (221), an inner core oxygen passage (222), an inner core air passage (223) arranged side by side and at intervals, and a first mixed gas passage (224) and a second mixed gas passage (225) respectively connected to the inner core gas passage (221) and the inner core oxygen passage (222), wherein: At the initial position, the gas channel (132) is disconnected from the gas channel (221) in the core and the first mixed gas channel (224); the oxygen channel (134) is disconnected from the oxygen channel (222) in the core and the second mixed gas channel (225); and the air channel (223) in the core and the air channel (133) are disconnected; At the air-fuel position, the first mixed gas channel (224) and the second mixed gas channel (225) are in a connected state with the fuel gas channel (132) and the oxygen channel (134), respectively, and the oxygen channel (222) and the fuel gas channel (221) in the core, as well as the air channel (223) in the core are in a disconnected state with the fuel gas channel (132), the oxygen channel (134), and the air channel (133), respectively; At the working station, the gas channel (221) in the core, the oxygen channel (222) in the core and the air channel (223) in the core are connected to the gas channel (132), the oxygen channel (134) and the air channel (133) respectively, and the first mixed gas channel (224) and the second mixed gas channel (225) are disconnected from the gas channel (132) and the oxygen channel (134) respectively.

3. The spray gun head with multi-state switching function according to claim 2, characterized in that: The control valve core (22) is an integrated valve core; The connecting line of the inlet and outlet ports of the gas channel (221) in the core and the connecting line of the inlet and outlet ports of the oxygen channel (222) in the core are parallel to each other; The inlet and outlet ports of the first mixed gas passage (224) are respectively located on the same longitudinal section of the control valve core (22) as the inlet and outlet ports of the in-core gas passage (221); The inlet and outlet ports of the second mixed gas passage (225) are respectively located on the same longitudinal section of the control valve core (22) as the inlet and outlet ports of the oxygen passage (222) in the core; The in-core air channel (223) comprises a long axis channel whose two port connection lines are parallel to the inlet and outlet port connection lines of the in-core gas channel (221).

4. The spray gun head with multi-state switching function according to claim 3, characterized in that: The air channel (223) in the core also includes a short-axis channel which is in a straight line and connected to the long-axis channel, and the long-axis channel and the short-axis channel are in a T-shape after being connected; The gun head housing (1) is also provided with an air outlet passage (131) for communicating with the air inlet passage (901) of the gun body (9); At the initial position and the working position, external compressed air is in communication with the air outlet passage (131) through the air passage (223) in the core.

5. The spray gun head with multi-state switching function according to claim 3, characterized in that: The long axis channels of the core gas channel (221), the core oxygen channel (222), the first mixed gas channel (224), the second mixed gas channel (225) and the core air channel (223) are all in a straight line shape; The included angle between the axes of the first mixed gas passage (224) and the second mixed gas passage (225) after being connected to the in-core fuel gas passage (221) and the in-core oxygen passage (222) respectively is an acute angle or an obtuse angle.

6. The spray gun head with multi-state switching function according to claim 5, characterized in that: At least two of the first mixed air passages (224) and the second mixed air passages (225) are provided, and the two or more first mixed air passages (224) and the second mixed air passages (225) are evenly distributed along the circumference of the control valve core (22); The channel cross-sectional areas of the first mixed gas channel (224) and the second mixed gas channel (225) are both smaller than the channel cross-sectional areas of the in-core fuel gas channel (221) and the in-core oxygen channel (222).

7. The spray gun head with multi-state switching function according to claim 1, characterized in that: The state control mechanism further comprises a rebound component (4) for driving the control valve core (22) to rotate from the working position to the initial position, and the rebound component (4) comprises: A rebound torsion spring (41) and a rebound housing (42) are mounted on the control valve core (22), and a valve core end cover (43) is fixed to the end of the control valve core (22). The valve core end cover (43) is fixedly connected to the rebound housing (42). The rebound housing (42) is rotatably connected to the gun head housing (1). One end of the rebound torsion spring (41) is clamped on the rebound housing (42), and the other end is clamped on the gun head housing (1).

8. The spray gun head with multi-state switching function according to claim 7, characterized in that: It also includes a safety buckle (52) rotatably connected to the gun head housing (1), and a switch wrench (51) fixedly connected to the safety buckle (52), wherein the rotation axis of the safety buckle (52) and the gun head housing (1) is arranged parallel to the control valve core (22); One end of the safety buckle (52) away from the switch wrench (51) is transmission-connected to the resilient housing (42).

9. The spray gun head with multi-state switching function according to claim 1, characterized in that: The state control mechanism also includes a control wrench (21) fixedly connected to the control valve core (22).

10. A flame spray gun with a multi-state switching function, comprising a spray gun head with a multi-state switching function as claimed in any one of claims 1 to 9, characterized in that: It also comprises a gun body (9), which is detachably connected to the gun head housing (1); A discharge pipe (8) is arranged inside the gun head housing (1), a discharge channel (81) is located inside the discharge pipe (8), and an air chamber (801) is located between the gun head housing (1) and the discharge pipe (8); It also includes a discharge pipe (7) detachably connected to the discharge pipe (8), and one end of the discharge pipe (7) away from the discharge pipe (8) extends into the gun body (9).

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