An on-line automatic gunning machine for electric furnaces

Abstract

The present application belongs to the technical field of refractory gunning, and is especially an on-line automatic gunning machine for electric furnace, comprising an automatic feeder, a gunning manipulator and an electric control cabinet, wherein the gunning manipulator is installed on a platform at one side of the electric furnace, the electric control cabinet and the gunning manipulator are respectively installed at one side of the gunning manipulator, the automatic feeder is composed of a pressure tank, a hopper, a vibrator, a pneumatic actuator and a weighing instrument, and the gunning manipulator is composed of a support, a manipulator rotary mechanism, a four-link cantilever, a lifting oil cylinder, a rotary drive mechanism, a pitch drive mechanism, a positioning column, a gun, a refractory rotary joint, a composite rotary joint, a hydraulic power unit and a feeding pipeline. The present application adopts semi-dry gunning, the feeder is a pressure tank type pneumatic conveying, the mixed water is filtered industrial water of the factory, and the electric control system is PLC industrial control or wireless remote control, so that automatic gunning or manual gunning operation can be realized, and the present application has the characteristics of high efficiency and flexible application control mode.

Description

Technical Field

[0001] This invention relates to the field of refractory spraying technology, specifically to an online automatic spraying machine for electric furnaces. Background Technology

[0002] A spraying machine is a construction tool that sprays unshaped refractory materials onto the lining of thermal equipment. It is used for spraying or repairing the lining of thermal equipment and has advantages such as simple construction, reduced labor intensity, and extended equipment service life.

[0003] Spraying machines can generally be divided into three types: wet spraying machines, dry spraying machines, and flame spraying machines. Wet spraying machines are suitable for wet spraying. They use compressed air to propel refractory powder of a certain consistency from a hopper onto the lining of thermal equipment through a spray gun. Because the refractory powder has a high moisture content, the temperature of the masonry drops sharply during repair, easily causing further damage to the original masonry, resulting in poor spraying effects. Dry spraying machines, on the other hand, are suitable for dry spraying. They use compressed air to blow dry refractory powder from a hopper to the front of the spray gun, where it mixes with water to become moist before being sprayed onto the lining. Because the refractory powder has a suitable moisture content, the spraying effect is better.

[0004] Traditional spraying machines, whether wet or dry, mostly rely on manual spraying operations, which are difficult to operate, inefficient, and have limited and flexible control methods.

[0005] Therefore, we propose an online automatic spraying machine for electric furnaces to solve the above problems. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this invention provides an online automatic spraying machine for electric furnaces, which solves the problems of traditional spraying machines, whether wet or dry spraying, which mostly rely on manual spraying operations, resulting in difficulties in operation, low efficiency, and limited and inflexible application control methods.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0010] An online automatic spraying machine for electric furnaces includes an automatic feeder, a spraying robot, and an electrical control cabinet. The spraying robot is installed on a platform on one side of the electric furnace. The electrical control cabinet and the spraying robot are respectively installed on one side of the spraying robot, and the distance between the automatic feeder and the spraying robot is no more than 12 meters.

[0011] The automatic feeder consists of a pressure tank, a hopper, a vibrator, a pneumatic actuator, and a weighing instrument.

[0012] The spraying robot consists of a support, a robot rotation mechanism, a four-bar cantilever, a lifting cylinder, a rotation drive mechanism, a pitch drive mechanism, a positioning column, a spray gun, a refractory rotary joint, a composite rotary joint, a hydraulic power unit, and a feeding pipeline.

[0013] Furthermore, the hopper is located at the top inlet of the pressure tank, and a screen is installed inside the hopper. A bag breaker is installed in the middle of the top of the screen. The vibrator is installed on the outer wall of the hopper, and a feed valve is provided at the bottom of the hopper. The feed valve is driven by a pneumatic actuator to control the opening and closing of the hopper's outlet. A feeding solenoid valve and a speed regulating valve are installed on the air supply line of the pneumatic actuator. The pressure tank is mounted on a weighing instrument, and a discharge valve is provided at the bottom outlet of the pressure tank. A spray chamber is connected to the outlet of the discharge valve, and a conveying pipe is connected to the outlet of the spray chamber.

[0014] Specifically, the pressure tank has an air inlet on the outer wall at the top of its inner cavity, a first auxiliary blowing port on the outer wall at the bottom of its inner cavity, and a second auxiliary blowing port on the injection chamber. The air inlet is connected to the air source pipeline via an air inlet pipe, the first auxiliary blowing port is connected to the air source pipeline via a first auxiliary blowing pipe, and the second auxiliary blowing port is connected to the air source pipeline via a second auxiliary blowing pipe.

[0015] Specifically, the gas source pipeline includes an oil-water separator connected to the gas source. The exhaust port of the oil-water separator is connected to the inlet pipeline, the first auxiliary blowing pipeline and the second auxiliary blowing pipeline through the first gas supply pipeline. The first gas supply pipeline is equipped with a two-position two-way reversing valve. The inlet pipeline, the first auxiliary blowing pipeline and the second auxiliary blowing pipeline are all equipped with pressure reducing valves, pressure gauges and check valves. The first auxiliary blowing pipeline is also equipped with a ball valve.

[0016] Furthermore, the four-bar cantilever is fixedly mounted on the support via a robotic arm rotation mechanism. The four-bar cantilever consists of a first cantilever, a second cantilever, a third cantilever, and a fourth cantilever. One end of the first cantilever is fixed to the robotic arm rotation mechanism. The second cantilever is rotatably connected to the other end of the first cantilever. The lifting cylinder is rotatably connected to the side wall of the first cantilever. The piston rod end of the lifting cylinder is rotatably connected to the second cantilever. The third cantilever is rotatably connected to the end of the second cantilever away from the first cantilever. The fourth cantilever is rotatably connected to the end of the third cantilever away from the second cantilever. The first cantilever and the third cantilever are fixed together by a fixing rod. The rotation drive mechanism is mounted on the third cantilever. The fourth cantilever is driven to rotate by the rotation drive mechanism. The spray gun is fixedly mounted on the end of the fourth cantilever away from the third cantilever via a positioning column. The pitch drive mechanism is rotatably connected to the fourth cantilever. The positioning column is driven by the pitch drive mechanism to make the spray gun pitch.

[0017] The feeding pipeline is connected to the automatic feeder's conveying pipeline. The feeding pipeline includes a front section, a middle section, and a rear section. The hydraulic power unit is connected in series on the front section. The front section is also equipped with a mixing connector, which is connected to an external water source. The hydraulic power unit is connected in series on the water source pipeline. The hydraulic power unit is used to supply filtered industrial water to the feeding pipeline. The front section and the middle section are rotatably connected via a refractory rotary joint. The front section is fixed to a support, and the middle section is fixed to a second cantilever. The refractory rotary joint works in conjunction with the robotic arm's rotary mechanism, ensuring that the front section of the four-bar cantilever remains fixed during rotation, while the middle and rear sections of the pipe rotate around the centerline of the support. The middle and rear sections of the pipe are rotatably connected via a composite rotary joint, which works in conjunction with the rotary drive mechanism, ensuring that the middle section of the fourth cantilever remains fixed during rotation, while the rear section of the pipe rotates with the fourth cantilever. The end of the rear section of the pipe furthest from the middle section is connected to the spray gun's inlet.

[0018] Specifically, the refractory rotary joint includes a first fixed joint, a first sleeve joint, a first pipeline connection joint, and a first connecting sleeve. The first fixed joint is fixed at the centerline of the support. The feed end of the first fixed joint is connected to the discharge end of the front pipeline. The first sleeve joint is fixedly installed on the first cantilever by a bolt assembly. The first pipeline connection joint is sealed and connected to the first moving joint. When the first cantilever rotates under the drive of the robotic arm rotation mechanism, the first pipeline connection joint rotates synchronously with the first cantilever. The first pipeline connection joint is connected to the middle pipeline through the first connecting sleeve.

[0019] The composite rotary joint includes a second connecting sleeve, a second fixed joint, a second sleeve joint, and a third connecting sleeve. The middle section of the pipeline is connected to the second fixed joint via the second connecting sleeve. The second sleeve joint is sleeved outside the second fixed joint and is rotatably connected to the second fixed joint. The second sleeve joint is fixed on the fourth cantilever. The rear section of the pipeline is connected to the second fixed joint via the third connecting sleeve. The bottom end of the fourth cantilever is provided with a two-way connecting seat. The end of the rear section of the pipeline away from the third connecting sleeve is rotatably connected to the two-way connecting seat. The other interface of the two-way connecting seat is connected to a support rotary joint. The support rotary joint includes a fixed joint and a moving joint. The fixed joint is fixedly connected to the fourth cantilever. The moving joint is rotatably connected to the fixed joint. The positioning column is fixed on the moving joint. The refractory outlet of the moving joint is connected to the refractory inlet of the spray gun.

[0020] Both the robotic arm rotation mechanism and the rotation drive mechanism use a combination of motors and gear sets to achieve load rotation.

[0021] (III) Beneficial Effects

[0022] Compared with the prior art, the present invention provides an online automatic spraying machine for electric furnaces, which has the following beneficial effects:

[0023] This invention employs a semi-dry spraying method, with a pressure tank-type pneumatic conveyor for the feeder, filtered industrial water from the factory for the mixing, and a PLC industrial control or wireless remote control system. It can realize automatic or manual spraying operations and features high efficiency and flexible and diverse application control methods. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the automatic feeder in this invention;

[0026] Figure 3 This is a schematic diagram of the pneumatic conveying pipeline of the pressure tank in this invention;

[0027] Figure 4 This is a schematic diagram of the overall structure of the spray patching robot in this invention;

[0028] Figure 5 This is a side view of the four-bar cantilever in this invention;

[0029] Figure 6 This is a schematic diagram of the refractory rotary joint in this invention;

[0030] Figure 7 This is a schematic diagram of the composite rotary joint in this invention;

[0031] Figure 8 This is a side view of the spraying robot in operation according to the present invention;

[0032] Figure 9 This is a top view of the spraying robot in this invention.

[0033] In the diagram: 1. Automatic feeder; 101. Pressure tank; 102. Hopper; 103. Vibrator; 104. Pneumatic actuator; 105. Weighing instrument; 106. Screen; 107. Bag breaker; 108. Feed valve; 109. Feeding solenoid valve; 110. Speed ​​control valve; 111. Discharge valve; 112. Spray chamber; 113. Conveying pipe; 2. Spraying robot; 201. Support; 202. Robot rotation mechanism; 203. Four-bar linkage; 204. Lifting cylinder; 205. Rotary drive mechanism; 206. Pitch drive. 207. Motion mechanism; 208. Positioning column; 209. Spray gun; 209. Refractory rotary joint; 2091. First fixed joint; 2092. First sleeve joint; 2093. First pipeline connection joint; 2094. First connecting sleeve; 210. Composite rotary joint; 2101. Second connecting sleeve; 2102. Second fixed joint; 2103. Second sleeve joint; 2104. Third connecting sleeve; 211. Hydraulic power unit; 212. Feeding pipeline; 213. Mixing water joint; 214. Support rotary joint; 3. Electrical control cabinet. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example

[0036] like Figure 1-9 As shown, an embodiment of the present invention proposes an online automatic spraying machine for electric furnaces, including an automatic feeder 1, a spraying robot 2, and an electrical control cabinet 3. The electrical control cabinet 3 is set up to realize electrical control and includes a PLC, a touch screen, a start button, an end button, a feeding button, a discharging button, a weighing display instrument and other power switches, a rotary encoder, a frequency converter, a wireless remote control system, etc. The spraying robot 2 is installed on a platform on one side of the electric furnace 4, and the electrical control cabinet 3 is installed near the spraying robot 2. The automatic feeder 1 can be installed near the spraying robot 2 for convenient material feeding, and the distance is no more than 12 meters.

[0037] The automatic feeder 1 consists of a pressure tank 101, a hopper 102, a vibrator 103, a pneumatic actuator 104, and a weighing instrument 105;

[0038] The spraying robot 2 consists of a support 201, a robot rotation mechanism 202, a four-bar cantilever 203, a lifting cylinder 204, a rotation drive mechanism 205, a pitch drive mechanism 206, a positioning column 207, a spray gun 208, a refractory rotary joint 209, a composite rotary joint 210, a hydraulic power unit 211, and a feeding pipeline 212.

[0039] like Figure 2 and 3 As shown, in some embodiments, a hopper 102 is located at the top inlet of the pressure tank 101. A screen 106 is installed inside the hopper 102, and a bag breaker 107 is installed at the top center of the screen 106. A vibrator 103 is installed on the outer wall of the hopper 102. A feed valve 108 is provided at the bottom of the hopper 102. The feed valve 108 is driven by a pneumatic actuator 104 to control the opening and closing of the outlet of the hopper 102. A feeding solenoid valve 109 and a speed regulating valve 110 are installed on the air supply line connecting the pneumatic actuator 104. The feeding solenoid valve 109 and the speed regulating valve 110 are used by the pneumatic actuator. 104 Opening and closing control and valve closing speed control; pressure tank 101 is installed on weighing instrument 105; the weighing instrument 105 can measure the total weight of pressure tank 101 and refractory material, and the weight of pressure tank 101 is subtracted to obtain the weight of refractory material delivered; auxiliary spray port is used to connect to air source to assist spraying of refractory material and prevent blockage of discharge port; discharge valve 111 is provided on the bottom discharge port of pressure tank 101, and spray chamber 112 is connected to the discharge port of discharge valve 111. Spray chamber 112 uses air jet to transport refractory material through pipeline, and conveying pipeline 113 is connected to the discharge port of spray chamber 112.

[0040] like Figure 3 As shown, in the above embodiment, the outer wall at the top of the inner cavity of the pressure tank 101 is provided with a tank air inlet, the outer wall at the bottom of the inner cavity of the pressure tank 101 is provided with a first auxiliary blowing port, and the injection chamber 112 is provided with a second auxiliary blowing port. The tank air inlet is connected to the air source pipeline through an air inlet pipeline, the first auxiliary blowing port is connected to the air source pipeline through a first auxiliary blowing pipeline, and the second auxiliary blowing port is connected to the air source pipeline through a second auxiliary blowing pipeline. The air source pipeline includes an oil-water separator connected to the air source. The exhaust port of the oil-water separator is connected to the air inlet pipeline, the first auxiliary blowing pipeline, and the second auxiliary blowing pipeline through a first air supply pipeline. A two-position two-way reversing valve is provided on the first air supply pipeline. A pressure reducing valve, a pressure gauge, and a check valve are provided on the air inlet pipeline, the first auxiliary blowing pipeline, and the second auxiliary blowing pipeline. A ball valve is also provided on the first auxiliary blowing pipeline.

[0041] like Figure 4 and 5As shown, in some embodiments, the four-bar cantilever 203 is fixedly mounted on the support 201 via a robotic arm rotation mechanism 202. The four-bar cantilever 203 consists of a first cantilever, a second cantilever, a third cantilever, and a fourth cantilever. One end of the first cantilever is fixed to the robotic arm rotation mechanism 202. The second cantilever is rotatably connected to the other end of the first cantilever. The lifting cylinder 204 is rotatably connected to the side wall of the first cantilever. The piston rod end of the lifting cylinder 204 is rotatably connected to the second cantilever. The third cantilever is rotatably connected to the second cantilever away from the first cantilever. At one end of the cantilever, the fourth cantilever is rotatably connected to the end of the third cantilever away from the second cantilever. The first cantilever and the third cantilever are fixed together by a fixing rod. The rotary drive mechanism 205 is installed on the third cantilever. The fourth cantilever is driven to rotate by the rotary drive mechanism 205. The spray gun 208 is fixedly installed on the end of the fourth cantilever away from the third cantilever by the positioning column 207. The pitch drive mechanism 206 is rotatably connected to the fourth cantilever. The positioning column 207 is driven by the pitch drive mechanism 206 to make the spray gun 208 pitch.

[0042] like Figure 4 As shown, the feeding pipeline 212 is connected to the conveying pipeline of the automatic feeder 1. The feeding pipeline 212 includes a front section pipeline, a middle section pipeline, and a rear section pipeline. The hydraulic power unit 211 is connected in series to the front section pipeline. The front section pipeline is also equipped with a mixing connector 213, which is connected to an external water source. The water source is filtered industrial water from the factory. The hydraulic power unit 211 is connected in series to the water source pipeline for conveying filtered industrial water to the feeding pipeline 212. The front section pipeline and the middle section pipeline are rotatably connected by a refractory swivel joint 209. The front section pipeline is fixed on the support 201, and the middle section pipeline is fixed on the second cantilever. The rotary joint 209 is linked with the robotic arm rotary mechanism 202, so that the front section of the four-bar cantilever 203 remains fixed during rotation, while the middle and rear sections of the pipe rotate around the centerline of the support 201 with the four-bar cantilever 203. The middle and rear sections of the pipe are rotatably connected by the composite rotary joint 210. The composite rotary joint 210 is linked with the rotary drive mechanism 205, so that the middle section of the pipe remains fixed during rotation, while the rear section of the pipe rotates with the fourth cantilever. The end of the rear section of the pipe away from the middle section of the pipe is connected to the feed port of the spray gun 208.

[0043] like Figure 6As shown, in some embodiments, the refractory rotary joint 209 includes a first fixed joint 2091, a first sleeve joint 2092, a first pipeline connection joint 2093, and a first connecting sleeve 2094. The first fixed joint 2091 is fixed at the centerline position of the support 201. The feed end of the first fixed joint 2091 is connected to the discharge end of the front pipeline. The first sleeve joint 2092 is fixedly installed on the first cantilever by bolt assembly. The first pipeline connection joint 2093 is sealed and connected to the first moving joint 2092. When the first cantilever rotates under the drive of the robot arm rotary mechanism 202, the first pipeline connection joint 2093 rotates synchronously with the first cantilever. The first pipeline connection joint 2093 is connected to the middle pipeline through the first connecting sleeve 2094.

[0044] like Figure 7 As shown, the composite rotary joint 210 includes a second connecting sleeve 2101, a second fixed joint 2102, a second sleeve connector 2103, and a third connecting sleeve 2104. The middle section of the pipeline is connected to the second fixed joint 2102 via the second connecting sleeve 2101. The second sleeve connector 2103 is sleeved outside the second fixed joint 2102 and is rotatably connected to the second fixed joint 2102. The second sleeve connector 2103 is fixed on the fourth cantilever. The downstream pipeline is connected via the third connecting sleeve 2104. The sleeve 2104 is connected to the second fixed connector 2102. The bottom end of the fourth cantilever is provided with a two-way connector. The end of the rear pipeline away from the third connecting sleeve 2104 is rotatably connected to the two-way connector. The other interface of the two-way connector is connected to the support rotary connector 214. The support rotary connector 214 includes a fixed connector and a moving connector. The fixed connector is fixedly connected to the fourth cantilever. The moving connector is rotatably connected to the fixed connector. The positioning column 207 is fixed on the moving connector. The refractory outlet of the moving connector is connected to the refractory inlet of the spray gun 208.

[0045] Both the robotic arm rotation mechanism 202 and the rotation drive mechanism 205 use a combination of motor and gear set to achieve load rotation. Specifically, taking the robotic arm rotation mechanism 202 as an example, the robotic arm rotation mechanism 202 includes a rotation motor, a drive gear and a fixed gear. The drive gear is connected to the output shaft end of the rotation motor, and the fixed gear is installed at the top middle position of the support 201. The rotation motor is installed on the chassis of the first cantilever. The chassis is rotatably connected to the fixed gear, and the chassis is fixedly connected to the outer wall of the first sleeve joint 2092. The drive gear meshes with the fixed gear. When the rotation motor drives the drive gear to rotate, it drives the first cantilever and the rotation motor to move around the fixed gear, thereby driving the spray gun 208 to rotate around the fixed gear.

[0046] like Figure 5As shown, the rotary drive mechanism 205 and the robotic arm rotary mechanism 202 have roughly the same structure. The difference is that in the rotary drive mechanism 205, the fixed gear is replaced with the driven gear. The rotary motor drives the active gear to rotate, which in turn drives the driven gear meshing with the active gear to rotate, thereby driving the fourth cantilever fixed at the bottom of the driven gear to rotate.

[0047] In this embodiment, the pitch drive mechanism 206 is also driven by a hydraulic cylinder. The extension end of the hydraulic cylinder is connected to the moving joint of the support rotary joint 214. The positioning column 207 is fixed on the moving joint. During operation, the extension and retraction of the hydraulic cylinder rod drives the support rotary joint 214 to rotate around the fixed joint of the support rotary joint 214.

[0048] Feeding operation: Press the feeding button on the electrical control cabinet 3. The automatic feeder 1 first opens the discharge valve 111 (also known as the exhaust valve), and then opens the feed valve 108 on the hopper 102. The bag breaker 107 on the hopper 102 punctures the refractory bag, and the refractory is added into the pressure tank 101 through the screen 106. Turn on the pneumatic vibrator 103 on the hopper 102 to accelerate the feeding by vibration. After feeding is completed, the weighing display instrument on the electrical control cabinet 3 will display the weight of the refractory. Pressing the end button will automatically close the feed valve 108 and the discharge valve 111.

[0049] Spraying operation: 1) Open the main air inlet valve and check whether the pressure in the pressure tank 101, the auxiliary spraying pressure, and the spraying chamber 112 on the automatic feeder 1 are normal; at this time, compressed air will be blown out from the nozzle of the spray gun 208, and the remaining refractory material in the spraying tube will also be blown out and cleaned.

[0050] 2) Select automatic or manual operation mode on the electrical control cabinet 3 or the wireless remote control, and press the start button. The lifting cylinder 204 extends and retracts, the spray gun 208 is raised and tilted upward under the drive of the pitch drive mechanism 206; the robotic arm rotation mechanism 202 rotates to the center of the electric furnace 4. At this time, the solenoid valve on the water supply pipeline opens, and the spray gun sprays water mist. After confirming the area to be sprayed, press the discharge button. The spraying machine will automatically spray the refractory onto the refractory melting area in the electric furnace 4 and sinter it at high temperature in the furnace. If manual spraying is selected, the spraying robotic arm 2 will be operated by the dual joysticks on the remote control to complete the spraying operation. When the spraying is finished, press the end button. The electrical control system will automatically close the discharge valve, raise the spray gun 208, rotate it to the standby position, close the solenoid valve on the water supply pipeline, and then close the main blow solenoid valve.

[0051] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An online automatic spraying machine for electric furnaces, characterized in that: It includes an automatic feeder (1), a spraying robot (2) and an electrical control cabinet (3). The spraying robot (2) is installed on a platform on one side of the electric furnace (4). The electrical control cabinet (3) and the spraying robot (2) are respectively installed on one side of the spraying robot (2), and the distance between the automatic feeder (1) and the spraying robot (2) is no more than 12 meters. The automatic feeder (1) consists of a pressure tank (101), a hopper (102), a vibrator (103), a pneumatic actuator (104), and a weighing instrument (105); The hopper (102) is located at the top inlet of the pressure tank (101). A screen (106) is installed inside the hopper (102). A bag breaker (107) is installed in the middle of the top of the screen (106). A vibrator (103) is installed on the outer wall of the hopper (102). A feed valve (108) is provided at the bottom of the hopper (102). The feed valve (108) is driven by a pneumatic actuator (104) to control the flow of the feed from the hopper (102). The material inlet is controlled to open and close. The pneumatic actuator (104) is equipped with a feeding solenoid valve (109) and a speed regulating valve (110) on the connecting air pipe. The pressure tank (101) is installed on the weighing instrument (105). The bottom outlet of the pressure tank (101) is equipped with a discharge valve (111). The outlet of the discharge valve (111) is connected to a spray chamber (112). The outlet of the spray chamber (112) is connected to a conveying pipe (113). The spraying robot (2) consists of a support (201), a robot rotation mechanism (202), a four-bar cantilever (203), a lifting cylinder (204), a rotation drive mechanism (205), a pitch drive mechanism (206), a positioning column (207), a spray gun (208), a refractory rotary joint (209), a composite rotary joint (210), a hydraulic power unit (211), and a feeding pipeline (212); The four-bar cantilever (203) is fixedly mounted on the support (201) via a robotic arm rotation mechanism (202). The four-bar cantilever (203) consists of a first cantilever, a second cantilever, a third cantilever, and a fourth cantilever. One end of the first cantilever is fixed to the robotic arm rotation mechanism (202), and the second cantilever is rotatably connected to the other end of the first cantilever. The lifting cylinder (204) is rotatably connected to the side wall of the first cantilever, and the piston rod end of the lifting cylinder (204) is rotatably connected to the second cantilever. The third cantilever is rotatably connected to the end of the second cantilever away from the first cantilever. The fourth cantilever is rotatably connected to the end of the third cantilever away from the second cantilever. The first cantilever and the third cantilever are fixed together by a fixing rod. The rotary drive mechanism (205) is installed on the third cantilever. The fourth cantilever is driven to rotate by the rotary drive mechanism (205). The spray gun (208) is fixedly installed on the end of the fourth cantilever away from the third cantilever by a positioning column (207). The pitch drive mechanism (206) is rotatably connected to the fourth cantilever. The positioning column (207) is driven by the pitch drive mechanism (206) to make the spray gun (208) pitch. The feeding pipeline (212) is connected to the conveying pipeline of the automatic feeder (1). The feeding pipeline (212) includes a front section pipeline, a middle section pipeline and a rear section pipeline. The hydraulic power unit (211) is connected in series to the front section pipeline. The front section pipeline is also provided with a mixing connector (213). The mixing connector (213) is connected to an external water source. The hydraulic power unit (211) is connected in series to the water source pipeline. The hydraulic power unit (211) is used to convey filtered industrial water to the feeding pipeline (212). The front section pipeline and the middle section pipeline are rotatably connected through a refractory rotary joint (209). The front section pipeline is fixed on the support (201). The middle section pipeline is fixed on the second cantilever. The middle section pipeline and the rear section pipeline are rotatably connected through a composite rotary joint (210). The end of the rear section pipeline away from the middle section pipeline is connected to the feed port of the spray gun (208).

2. The online automatic spraying machine for electric furnaces according to claim 1, characterized in that: The pressure tank (101) has an air inlet on the outer wall at the top of its inner cavity, a first auxiliary blowing port on the outer wall at the bottom of its inner cavity, and a second auxiliary blowing port on the injection chamber (112). The air inlet is connected to the air source pipeline via an air inlet pipe, the first auxiliary blowing port is connected to the air source pipeline via a first auxiliary blowing pipe, and the second auxiliary blowing port is connected to the air source pipeline via a second auxiliary blowing pipe.

3. The online automatic spraying machine for electric furnaces according to claim 2, characterized in that: The gas source pipeline includes an oil-water separator connected to the gas source. The exhaust port of the oil-water separator is connected to the inlet pipeline, the first auxiliary blowing pipeline and the second auxiliary blowing pipeline through the first gas supply pipeline. The first gas supply pipeline is equipped with a two-position two-way reversing valve. The inlet pipeline, the first auxiliary blowing pipeline and the second auxiliary blowing pipeline are all equipped with pressure reducing valves, pressure gauges and check valves. The first auxiliary blowing pipeline is also equipped with a ball valve.

4. The online automatic spraying machine for electric furnaces according to claim 1, characterized in that: The refractory rotary joint (209) includes a first fixed joint (2091), a first sleeve joint (2092), a first pipeline connection joint (2093), and a first connecting sleeve (2094). The first fixed joint (2091) is fixed at the center line of the support (201). The feed end of the first fixed joint (2091) is connected to the discharge end of the front pipeline. The first sleeve joint (2092) is fixedly installed on the first cantilever by bolt assembly. The first pipeline connection joint (2093) is sealed and connected to the first sleeve joint (2092). The first pipeline connection joint (2093) is connected to the middle pipeline through the first connecting sleeve (2094). The composite rotary joint (210) includes a second connecting sleeve (2101), a second fixed joint (2102), a second sleeve joint (2103), and a third connecting sleeve (2104). The middle section of the pipeline is connected to the second fixed joint (2102) via the second connecting sleeve (2101). The second sleeve joint (2103) is sleeved outside the second fixed joint (2102) and is rotatably connected to the second fixed joint (2102). The second sleeve joint (2103) is fixed on the fourth cantilever. The rear section of the pipeline is connected via the third connecting sleeve (2104). The connecting sleeve (2104) is connected to the second fixed connector (2102). The bottom end of the fourth cantilever is provided with a two-way connector. The end of the rear pipeline away from the third connecting sleeve (2104) is rotatably connected to the two-way connector. The other interface of the two-way connector is connected to a support rotary connector (214). The support rotary connector (214) includes a fixed connector and a moving connector. The fixed connector is fixedly connected to the fourth cantilever. The moving connector is rotatably connected to the fixed connector. The positioning column (207) is fixed on the moving connector. The refractory outlet of the moving connector is connected to the refractory inlet of the spray gun (208). Both the robotic arm rotation mechanism (202) and the rotation drive mechanism (205) use a combination of motor and gear set to achieve load rotation.

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