Welding equipment for rotary cultivator cutter shafts with different sizes

Abstract

The invention relates to the technical field of welding, in particular to welding equipment for rotary cultivator cutter shafts with different sizes, which comprises a welding machine, a threaded rod is rotatably mounted in the welding machine, two groups of first threaded sleeves are slidably connected to the threaded rod, and clamps are fixedly mounted on the two groups of first threaded sleeves; an auxiliary assembly is installed on the welding machine, the auxiliary assembly comprises a first reciprocating lead screw fixedly connected with one side of the welding machine through an installation frame, and a second threaded sleeve is installed on the first reciprocating lead screw in a sliding mode. The threaded disc extrudes hot air in the piston pipe, the hot air in the piston pipe is transmitted into the circulating pipe to be circulated, the rotary tillage shaft is preheated, the situation that the cooling speed of the welding portion of the rotary tillage shaft is too high due to low temperature in winter is prevented, cracks are generated due to the fact that residual stress in a welding seam cannot be released in time is avoided, and it is ensured that the strength and toughness of a welding joint are consistent.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to a welding device for rotary tiller cutter shafts of different sizes. Background Technology

[0002] Rotary tiller cutter shaft welding equipment is an automated welding system designed for rotary tiller cutter shafts. Through mechanical motion control, welding process parameter optimization and automated feeding technology, it replaces traditional manual welding, solves problems such as high labor intensity, large welding position deviation and unstable quality, and improves production efficiency and product consistency. During winter rotary tiller welding operations, the welded joint between the rotary tiller and the blade holder is prone to excessive cooling due to low temperatures. This can cause residual stress in the weld to be unable to be released in time, resulting in cracks, which affect the strength and toughness of the welded joint, and make it difficult to ensure that the welding quality meets the requirements. Summary of the Invention

[0003] The purpose of this invention is to provide a welding device for rotary tiller blade shafts of different sizes. The second reciprocating screw drives the threaded disc to move back and forth inside the piston tube. The threaded disc compresses the hot air inside the piston tube, and the hot air inside the piston tube is transferred to the circulation pipe for circulation, preheating the rotary tiller shaft. This prevents the welding part of the rotary tiller shaft from cooling too quickly due to the low temperature in winter, avoids cracks caused by the inability to release residual stress in the weld in time, and ensures that the strength and toughness of the welded joint meet the requirements.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a welding device for rotary tiller blade shafts of different sizes, comprising a welding machine, wherein a threaded rod is rotatably mounted inside the welding machine, and two sets of first threaded sleeves are slidably connected to the threaded rod, and clamps are fixedly mounted on both sets of first threaded sleeves; an auxiliary component is mounted on the welding machine, the auxiliary component including a first reciprocating screw fixedly connected to one side of the welding machine via a mounting frame, a second threaded sleeve is slidably mounted on the first reciprocating screw, and a feeding robotic arm and a welding robotic arm are fixedly mounted on the second threaded sleeve; The first reciprocating lead screw is connected to a second reciprocating lead screw via a synchronous belt. A threaded disc is slidably connected to the second reciprocating lead screw. A piston tube is installed on the outer surface of the threaded disc. A protective frame is fixedly installed on one side of the piston tube. A heating rod is fixedly installed inside the protective frame. A circulation pipe is connected to the other side of the piston tube. The circulation pipe is located inside the welding machine. The exhaust port of the circulation pipe is connected to a collection box. A hose is connected inside the collection box. One end of the hose is fixedly connected to the welding point of the welding robot arm. A transmission pipe is connected to one end of the piston tube. Multiple sets of nozzles are provided on one side of the transmission pipe.

[0005] Preferably, a first motor is fixedly installed on the welding machine, one end of the threaded rod passes through the inside of the welding machine, and one end of the threaded rod is fixedly connected to the output end of the first motor. The two sets of first threaded sleeves are connected to the threaded rod through ball nut pairs.

[0006] Preferably, a second motor is fixedly mounted on one side of the welding machine via a mounting bracket, and the output end of the second motor is fixedly connected to one end of the first reciprocating lead screw. The first reciprocating lead screw and the second threaded sleeve are connected via a ball nut pair.

[0007] Preferably, one end of the second reciprocating screw passes through the other end of the piston tube, and the second reciprocating screw rotates inside the piston tube, while the threaded disc is slidably connected to the inside of the piston tube.

[0008] Preferably, the second reciprocating screw is connected to the threaded disc via a ball nut pair, the piston tube has a groove inside, and the threaded disc has a protrusion on one side that slides inside the groove.

[0009] Preferably, the output end and exhaust port of the circulation pipe both penetrate the interior of the welding machine, and the output end of the circulation pipe is connected to one side of the piston pipe, while the exhaust port of the circulation pipe is connected to one side of the collection box.

[0010] Preferably, an air pump is fixedly installed inside the collection box, a hose is fixedly connected to the output end of the air pump, an air inlet pipe is provided on the other side of the piston tube, and a one-way valve is provided on the air inlet pipe.

[0011] Preferably, one end of the piston tube is connected to a connecting pipe, one end of which passes through the inside of the protective frame and one side of the welding machine in sequence, and one end of the connecting pipe is connected to the transmission pipe, and a solenoid valve is provided on the connecting pipe.

[0012] Compared with the prior art, the beneficial effects of the present invention are: In this invention, the first reciprocating screw drives the second reciprocating screw to rotate via a synchronous belt. The second reciprocating screw drives the threaded disc to move back and forth inside the piston tube. The threaded disc compresses the hot air inside the piston tube, which is then transferred to the circulation pipe for circulation. This preheats the rotary tiller shaft, preventing the welded parts from cooling too quickly due to low winter temperatures. This avoids cracks caused by the inability to release residual stress in the weld in time, ensuring that the strength and toughness of the welded joint meet the requirements.

[0013] This invention uses an air pump to extract hot air collected inside a collection box and transfers the hot air to a flexible hose. Since one end of the hose is fixedly connected to one side of the welding robotic arm, the hose sprays the hot air inside onto the welding joint between the blade holder and the rotary tiller shaft as it moves with the welding robotic arm. This assists in the transfer of hot air into the circulation pipe to preheat the rotary tiller shaft. This ensures that the rotary tiller shaft is preheated before welding, preventing defects such as cracks and porosity in the weld metal due to rapid cooling, and also reducing welding stress concentration.

[0014] In this invention, the second reciprocating screw drives the threaded disc to compress the gas inside the piston tube. Part of the gas circulates through the circulation pipe to dissipate heat from the rotating shaft, while the other part of the gas is transmitted to the transmission pipe through the connecting pipe. The gas inside the transmission pipe is sprayed onto the rotating shaft through multiple sets of nozzles to assist the circulation pipe in dissipating heat from the rotating shaft. This prevents the welding area of ​​the rotary tiller shaft from overheating due to high temperatures in summer, avoids coarsening of the weld metal grains which reduces mechanical properties, and reduces welding deformation and residual stress. Attached Figure Description

[0015] Figure 1 This is one of the overall structural schematic diagrams of the present invention; Figure 2 This is a second schematic diagram of the overall structure of the present invention; Figure 3 This is a cross-sectional view of the welding machine structure of the present invention; Figure 4 This is a schematic diagram of the auxiliary component structure of the present invention; Figure 5 This is a cross-sectional view of the auxiliary component structure of the present invention; Figure 6 This is a cross-sectional view of the piston tube structure of the present invention; Figure 7 This is a cross-sectional view of the collection box structure of the present invention.

[0016] In the diagram: 1. Welding machine; 101. First motor; 102. Threaded rod; 103. First threaded sleeve; 104. Fixture; 2. Auxiliary components; 201. Second motor; 202. First reciprocating lead screw; 203. Feeding robotic arm; 204. Welding robotic arm; 205. Synchronous belt; 206. Second reciprocating lead screw; 207. Threaded disc; 208. Piston tube; 209. Circulation pipe; 210. Collection box; 211. Air pump; 212. Hose; 213. Protective frame; 214. Heating rod; 215. Connecting pipe; 216. Solenoid valve; 217. Transmission pipe; 218. Second threaded sleeve; 219. Nozzle. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] See Figures 1 to 4 As shown, the present invention provides a welding device for rotary tiller blade shafts of different sizes, including a welding machine 1. A threaded rod 102 is rotatably installed inside the welding machine 1. Two sets of first threaded sleeves 103 are slidably connected to the threaded rod 102. A clamp 104 is fixedly installed on each of the two sets of first threaded sleeves 103. An auxiliary component 2 is installed on the welding machine 1. The auxiliary component 2 includes a first reciprocating screw 202 fixedly connected to one side of the welding machine 1 through a mounting frame. A second threaded sleeve 218 is slidably installed on the first reciprocating screw 202. A feeding robotic arm 203 and a welding robotic arm 204 are fixedly installed on the second threaded sleeve 218. The operator places the rotary tiller shaft into the welding machine 1, and then starts the first motor 101. Since the threaded rod 102 is connected to the two sets of first threaded sleeves 103 through ball nut pairs, the first motor 101 drives the threaded rod 102 to rotate. The threaded rod 102 drives the clamp 104 to move through the two sets of first threaded sleeves 103, adjusting the size of the rotary tiller shaft to fit different sizes. Then, the two sets of clamps 104 are started to hold the rotary tiller shaft. The operator starts the second motor 201, which drives the first reciprocating screw 202 to rotate. Since the first reciprocating screw 202 is connected to the second threaded sleeve 218 through ball nut pairs, the first reciprocating screw 202 drives the loading robot arm 203 and the welding robot arm 204 to move through the second threaded sleeve 218. The loading robot arm 203 picks up the blade holder, and the welding robot arm 204 welds the connection between the blade holder and the rotary tiller shaft. See Figures 5 to 7As shown, the first reciprocating screw 202 is connected to the second reciprocating screw 206 via the synchronous belt 205. A threaded disc 207 is slidably connected to the second reciprocating screw 206. A piston tube 208 is installed on the outer surface of the threaded disc 207. A protective frame 213 is fixedly installed on one side of the piston tube 208. A heating rod 214 is fixedly installed inside the protective frame 213. A circulation pipe 209 is connected to the other side of the piston tube 208. The circulation pipe 209 is located inside the welding machine 1. The exhaust port of the circulation pipe 209 is connected to a collection box 210. A hose 212 is connected inside the collection box 210. One end of the hose 212 is fixedly connected to the welding point of the welding robot arm 204. One end of the piston tube 208 is connected to a transmission pipe 217. Multiple sets of nozzles 219 are provided on one side of the transmission pipe 217. When welding machine 1 is performing welding work on the blade holder and rotary tiller shaft in winter, the operator activates the heating rod 214 inside the protective frame 213. The heating rod 214 heats the air inside the piston tube 208, and then starts the second motor 201. The second motor 201 drives the first reciprocating lead screw 202 to rotate. However, at this time, the first reciprocating lead screw 202 will drive the welding robotic arm 204 and the first threaded sleeve 103 to move through the second threaded sleeve 218. The operator does not start the welding robotic arm 204 and the feeding robotic arm 203 to work. The first reciprocating lead screw 202 drives the second reciprocating lead screw 206 to rotate through the synchronous belt 205. Because the second reciprocating lead screw 206... The threaded disc 207 is connected to the threaded disc 207 via a ball nut pair, and the protrusion on one side of the threaded disc 207 slides on the groove inside the piston tube 208. Therefore, the second reciprocating screw 206 drives the threaded disc 207 to reciprocate inside the piston tube 208. The threaded disc 207 compresses the hot air inside the piston tube 208. Since the solenoid valve 216 on the connecting pipe 215 is closed at this time, the hot air inside the piston tube 208 is transferred to the circulation pipe 209 for circulation, preheating the rotary tiller shaft. This prevents the welding part of the rotary tiller shaft from cooling too quickly due to the low temperature in winter, avoids cracks caused by the inability to release residual stress in the weld in time, and ensures that the strength and toughness of the welded joint meet the requirements. While the hot air inside the piston tube 208 is circulated inside the circulation tube 209, the hot air is also collected inside the second motor 201 through the exhaust port of the circulation tube 209. When the welding work begins, the operator starts the air pump 211. The air pump 211 draws the hot air collected inside the collection box 210 and transfers the hot air to the hose 212. Since one end of the hose 212 is fixedly connected to one side of the welding robot arm 204, the hose 212 sprays the hot air inside onto the welding joint of the blade holder and the rotary tiller shaft as it moves with the welding robot arm 204. This helps the hot air to circulate inside the circulation tube 209 and preheat the rotary tiller shaft. This ensures that the rotary tiller shaft is preheated and prevents defects such as cracks and porosity in the weld metal due to rapid cooling during welding. It also reduces welding stress concentration. When welding machine 1 is performing welding work on the cutter holder and rotary tiller shaft in summer, the construction personnel start the first reciprocating screw 202. Simultaneously, the first reciprocating screw 202 drives the feeding robotic arm 203 and welding robotic arm 204 to move via the second threaded sleeve 218. At the same time, the first reciprocating screw 202 drives the second reciprocating screw 206 to rotate via the synchronous belt 205. Since the heating rod 214 is not activated at this time, it does not heat the air inside the piston tube 208, and the solenoid valve 216 on the connecting pipe 215 is in the open state. Therefore, the second reciprocating screw 206 drives the threaded disc 207 to compress the gas inside the piston tube 208. Part of the gas circulates through the circulation pipe 209 to dissipate heat from the rotating shaft, while the other part of the gas is transmitted to the transmission pipe 217 through the connecting pipe 215. The gas inside the transmission pipe 217 is sprayed onto the rotating shaft through multiple sets of nozzles 219 to assist the circulation pipe 209 in dissipating heat from the rotating shaft, preventing the welding area of ​​the rotary tiller shaft from overheating due to high summer temperatures, avoiding coarsening of the weld metal grains and reducing mechanical properties, and reducing welding deformation and residual stress. Additionally, an intake pipe on one side of the piston tube 208 is used to allow outside air to flow into the piston tube 208 and replenish the gas inside the piston tube 208. A one-way valve on the intake pipe prevents the gas inside the piston tube 208 from leaking to the outside through the intake pipe.

[0019] In an optional embodiment, a first motor 101 is fixedly installed on the welding machine 1, one end of the threaded rod 102 penetrates the interior of the welding machine 1, and one end of the threaded rod 102 is fixedly connected to the output end of the first motor 101. Two sets of first threaded sleeves 103 are connected to the threaded rod 102 through ball nut pairs.

[0020] It should be noted that since the threaded rod 102 is connected to the two sets of first threaded sleeves 103 through ball nut pairs, the first motor 101 drives the threaded rod 102 to rotate, and the threaded rod 102 drives the clamp 104 to move through the two sets of first threaded sleeves 103, thereby adjusting the size of the rotary tiller shaft of different sizes.

[0021] In an optional embodiment, a second motor 201 is fixedly mounted on one side of the welding machine 1 via a mounting bracket. The output end of the second motor 201 is fixedly connected to one end of the first reciprocating lead screw 202. The first reciprocating lead screw 202 is connected to the second threaded sleeve 218 via a ball nut pair.

[0022] It should be noted that since the first reciprocating screw 202 and the second threaded sleeve 218 are connected by a ball nut pair, the first reciprocating screw 202 drives the feeding robot arm 203 and the welding robot arm 204 to move through the second threaded sleeve 218. The feeding robot arm 203 picks up the tool holder, and the welding robot arm 204 welds the connection between the tool holder and the rotary tiller shaft.

[0023] In an optional embodiment, one end of the second reciprocating screw 206 passes through the other end of the piston tube 208, and the second reciprocating screw 206 rotates inside the piston tube 208, while the threaded disc 207 is slidably connected to the inside of the piston tube 208.

[0024] It should be noted that the first reciprocating screw 202 drives the second reciprocating screw 206 to rotate via the synchronous belt 205, and the second reciprocating screw 206 drives the threaded disc 207 to reciprocate inside the piston tube 208.

[0025] In an optional embodiment, the second reciprocating screw 206 is connected to the threaded disc 207 via a ball nut pair, the piston tube 208 has a groove inside, and the threaded disc 207 has a protrusion on one side that slides inside the groove.

[0026] It should be noted that, since the second reciprocating screw 206 is connected to the threaded disc 207 through a ball nut pair, and the protrusion on one side of the threaded disc 207 slides on the groove inside the piston tube 208, the second reciprocating screw 206 drives the threaded disc 207 to reciprocate inside the piston tube 208.

[0027] In an optional embodiment, the output end and the exhaust port of the circulation pipe 209 both penetrate the interior of the welding machine 1, and the output end of the circulation pipe 209 is connected to one side of the piston pipe 208, while the exhaust port of the circulation pipe 209 is connected to one side of the collection box 210.

[0028] It should be noted that the hot air is transferred to the inside of the second motor 201 for collection through the exhaust port of the circulation pipe 209.

[0029] In an optional embodiment, an air pump 211 is fixedly installed inside the collection box 210, and a hose 212 is fixedly connected to the output end of the air pump 211. An air inlet pipe is provided on the other side of the piston tube 208, and a one-way valve is provided on the air inlet pipe.

[0030] It should be noted that the air pump 211 draws the hot air collected inside the collection box 210 and transfers the hot air to the inside of the hose 212. The air inlet pipe on one side of the piston tube 208 is used for the flow of outside air into the piston tube 208 to replenish the gas inside the piston tube 208. The one-way valve on the air inlet pipe prevents the gas inside the piston tube 208 from leaking to the outside through the air inlet pipe.

[0031] In an optional embodiment, one end of the piston tube 208 is connected to a connecting tube 215, one end of the connecting tube 215 passes through the inside of the protective frame 213 and one side of the welding machine 1 in sequence, and one end of the connecting tube 215 is connected to the transmission tube 217. A solenoid valve 216 is provided on the connecting tube 215.

[0032] It should be noted that when the solenoid valve 216 is closed in winter, the hot air in the piston tube 208 preheats the rotary tiller shaft through the circulation pipe 209, preventing the weld from cooling too quickly due to low temperature, which can cause cracks and porosity, and reducing stress concentration. When the solenoid valve 216 is opened in summer, part of the gas in the piston tube 208 is cooled through the circulation pipe 209, and part is sprayed through the connecting pipe 215 and the nozzle 219 to assist in cooling, preventing the weld metal grains from coarsening due to high temperature, reducing mechanical properties, and reducing deformation and residual stress. At the same time, the one-way valve in the air inlet pipe can prevent gas leakage and ensure stable operation of the system.

[0033] Working principle: The operator places the rotary tiller shaft into the welding machine 1, and then starts the first motor 101. Since the threaded rod 102 is connected to the two sets of first threaded sleeves 103 through ball nut pairs, the first motor 101 drives the threaded rod 102 to rotate. The threaded rod 102 drives the clamp 104 to move through the two sets of first threaded sleeves 103 to adjust the size of the rotary tiller shaft to the appropriate size. Then, the two sets of clamps 104 are started to hold the rotary tiller shaft. The operator starts the second motor 201, which drives the first reciprocating screw 202 to rotate. Since the first reciprocating screw 202 is connected to the second threaded sleeve 218 through ball nut pairs, the first reciprocating screw 202 drives the loading robot arm 203 and the welding robot arm 204 to move through the second threaded sleeve 218. The loading robot arm 203 picks up the blade holder, and the welding robot arm 204 welds the connection between the blade holder and the rotary tiller shaft. When welding machine 1 is performing welding work on the blade holder and rotary tiller shaft in winter, the operator activates the heating rod 214 inside the protective frame 213. The heating rod 214 heats the air inside the piston tube 208, and then starts the second motor 201. The second motor 201 drives the first reciprocating screw 202 to rotate. However, at this time, the first reciprocating screw 202 will drive the welding robotic arm 204 and the first threaded sleeve 103 to move through the second threaded sleeve 218. The operator does not start the welding robotic arm 204 and the feeding robotic arm 203 to work. The first reciprocating screw 202 is driven by the synchronous belt. 205 drives the second reciprocating screw 206 to rotate. Since the second reciprocating screw 206 is connected to the threaded disc 207 through a ball nut pair, and the protrusion on one side of the threaded disc 207 slides on the groove inside the piston tube 208, the second reciprocating screw 206 drives the threaded disc 207 to reciprocate inside the piston tube 208. The threaded disc 207 compresses the hot air inside the piston tube 208. Since the solenoid valve 216 on the connecting pipe 215 is closed at this time, the hot air inside the piston tube 208 is transferred to the circulation pipe 209 for circulation, preheating the rotary tiller shaft. While the hot air inside the piston tube 208 is circulated inside the circulation tube 209, the hot air is also collected inside the second motor 201 through the exhaust port of the circulation tube 209. When the welding work begins, the operator starts the air pump 211. The air pump 211 draws the hot air collected inside the collection box 210 and transfers the hot air to the hose 212. Since one end of the hose 212 is fixedly connected to one side of the welding robot arm 204, the hose 212 sprays the hot air inside onto the welding joint of the blade holder and the rotary tiller shaft as it moves with the welding robot arm 204, assisting in the transfer of hot air to the circulation tube 209 for circulation and preheating the rotary tiller shaft. When welding machine 1 is performing welding work on the blade holder and rotary tiller shaft in summer, the construction personnel start the first reciprocating screw 202. The first reciprocating screw 202 drives the feeding mechanical arm 203 and the welding mechanical arm 204 to move through the second threaded sleeve 218. At the same time, the first reciprocating screw 202 drives the second reciprocating screw 206 to rotate through the synchronous belt 205. Since the heating rod 214 is not activated at this time, the heating rod 214 does not heat the air inside the piston tube 208, and the solenoid valve 216 on the connecting pipe 215 is in the open state. Therefore, the second reciprocating screw 206 drives the threaded disc 207 to compress the gas inside the piston tube 208. Part of the gas circulates through the circulation pipe 209 to dissipate heat from the rotating shaft, and the other part of the gas is transmitted to the transmission pipe 217 through the connecting pipe 215. The gas inside the transmission pipe 217 is sprayed onto the rotating shaft through multiple sets of nozzles 219 to assist the circulation pipe 209 in dissipating heat from the rotating shaft.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding device for rotary tiller blade shafts of different sizes, comprising a welding machine (1), wherein a threaded rod (102) is rotatably mounted inside the welding machine (1), and two sets of first threaded sleeves (103) are slidably connected on the threaded rod (102), and clamps (104) are fixedly mounted on both sets of first threaded sleeves (103), characterized in that, The welding machine (1) is equipped with an auxiliary component (2). The auxiliary component (2) includes a first reciprocating screw (202) fixedly connected to one side of the welding machine (1) via a mounting bracket. A second threaded sleeve (218) is slidably mounted on the first reciprocating screw (202). A feeding robot arm (203) and a welding robot arm (204) are fixedly mounted on the second threaded sleeve (218). The first reciprocating screw (202) is connected to the second reciprocating screw (206) via a synchronous belt (205). A threaded disc (207) is slidably connected to the second reciprocating screw (206). A piston tube (208) is installed on the outer surface of the threaded disc (207). A protective frame (213) is fixedly installed on one side of the piston tube (208). A heating rod (214) is fixedly installed inside the protective frame (213). A circulation pipe (209) is connected to the other side of the piston tube (208). The circulation pipe (209) is located inside the welding machine (1). The exhaust port of the circulation pipe (209) is connected to a collection box (210). A hose (212) is connected inside the collection box (210). One end of the hose (212) is fixedly connected to the welding point of the welding robot arm (204). One end of the piston tube (208) is connected to a transmission pipe (217). Multiple sets of nozzles (219) are provided on one side of the transmission pipe (217).

2. The welding equipment for rotary tiller cutter shafts of different sizes according to claim 1, characterized in that, The welding machine (1) is fixedly installed with a first motor (101), one end of the threaded rod (102) penetrates the inside of the welding machine (1), and one end of the threaded rod (102) is fixedly connected to the output end of the first motor (101). The two sets of first threaded sleeves (103) are connected to the threaded rod (102) through ball nut pairs.

3. The welding equipment for rotary tiller cutter shafts of different sizes according to claim 1, characterized in that, The welding machine (1) has a second motor (201) fixedly installed on one side by a mounting bracket. The output end of the second motor (201) is fixedly connected to one end of the first reciprocating screw (202). The first reciprocating screw (202) is connected to the second threaded sleeve (218) by a ball nut pair.

4. The welding equipment for rotary tiller cutter shafts of different sizes according to claim 1, characterized in that, One end of the second reciprocating screw (206) passes through the other end of the piston tube (208), and the second reciprocating screw (206) rotates inside the piston tube (208). The threaded disc (207) is slidably connected to the inside of the piston tube (208).

5. The welding equipment for rotary tiller cutter shafts of different sizes according to claim 1, characterized in that, The second reciprocating screw (206) is connected to the threaded disc (207) through a ball nut pair. The piston tube (208) has a groove inside, and the threaded disc (207) has a protrusion on one side that slides inside the groove.

6. The welding equipment for rotary tiller cutter shafts of different sizes according to claim 1, characterized in that, The output end and exhaust port of the circulation pipe (209) both penetrate the inside of the welding machine (1), and the output end of the circulation pipe (209) is connected to one side of the piston pipe (208), while the exhaust port of the circulation pipe (209) is connected to one side of the collection box (210).

7. The welding equipment for rotary tiller cutter shafts of different sizes according to claim 1, characterized in that, An air pump (211) is fixedly installed inside the collection box (210). A hose (212) is fixedly connected to the output end of the air pump (211). An air inlet pipe is provided on the other side of the piston tube (208). A one-way valve is provided on the air inlet pipe.

8. The welding equipment for rotary tiller cutter shafts of different sizes according to claim 1, characterized in that, One end of the piston tube (208) is connected to a connecting tube (215). One end of the connecting tube (215) passes through the inside of the protective frame (213) and the side of the welding machine (1) in sequence. One end of the connecting tube (215) is connected to the transmission tube (217). A solenoid valve (216) is provided on the connecting tube (215).

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