Inverter type direct-current arc welding machine with high temporary load rate

Abstract

The invention relates to the technical field of inverter arc welding machines and discloses an inverter type direct-current arc welding machine with the high temporary load rate. The inverter type direct-current arc welding machine comprises a machine box, a plurality of air outlets are formed in the two sides of the machine box, a dehumidification device is installed on the rear side of the machine box and comprises a box body, and the box body is fixedly connected to the rear side of the machine box; an alternate dehumidification assembly is installed in the box body, a plugging device is installed in the case, and the air outlet is plugged by the plugging device; when the cooling fan blows air to cool the interior of the case, external air needs to enter the first cavity of the case body firstly and then enter the interior of the case after being dehumidified by the alternate dehumidification assembly, so that damage such as corrosion or short circuit of circuit elements in the case caused by humid air is avoided, the safety is high, and the service life of a machine can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of inverter arc welders, and in particular to an inverter DC arc welder with a high duty cycle. Background Art

[0002] An inverter DC arc welder is an inverter stick arc welder that uses MOSFET field-effect power tubes as switching elements. A large amount of heat will be generated inside the device during operation, so it is necessary to dissipate heat in time to ensure the normal operation of the device and avoid damage due to high temperature and reduced service life.

[0003] After retrieval, Chinese Patent No. CN103624364A discloses an inverter DC arc welder with a high duty cycle, which includes a housing and a circuit board and electrical components arranged inside the housing. The front and rear plates of the housing are respectively provided with an air inlet and an air outlet. A fan is installed at the air inlet located on the rear plate. An insulating partition parallel to the circuit board is also arranged inside the housing. Two power radiators and an output rectifier radiator are respectively arranged between the insulating partition and the circuit board. The two ends of the two power radiators and the two output rectifier radiators are respectively installed at the upper and lower ends of the insulating partition and the circuit board. The two power radiators, the two output rectifier radiators and the insulating partition enclose a heat dissipation channel for dissipating heat of electrical components.

[0004] The device in the above-mentioned disclosed document realizes the efficient heat dissipation of the device by installing a fan at the air inlet and cooperating with structures such as a heat dissipation channel surrounded by power radiators, output rectifier radiators and an insulating partition. However, in actual use, when the fan sucks external air from the air inlet into the device, if the air is humid, it will also cause the humidity of the cooling air entering the device to be relatively high, and long-term use is likely to cause corrosion, short circuit and other damages to circuit components.

[0005] To solve the above problems, the present application proposes an inverter DC arc welder with a high duty cycle. Summary of the Invention

[0006] The present invention provides an inverter DC arc welder with a high duty cycle to solve the above technical problems.

[0007] To solve the above technical problems, an inverter DC arc welder with a high duty cycle provided by the present invention includes a chassis. A plurality of air outlets are opened on both sides of the chassis. A dehumidifying device is installed at the rear of the chassis. The dehumidifying device includes a box body fixedly connected to the rear of the chassis. An alternating dehumidifying component is installed inside the box body. A blocking device is installed inside the chassis, and the blocking device blocks the air outlets.

[0008] Preferably, the chassis is composed of a casing, a base, a front cover, a rear cover and a cooling fan. The casing is fixedly connected to the top of the base by bolts. The front cover and the rear cover are respectively fixedly connected to the front and rear sides of the casing by screws. The cooling fan is embedded and connected to the rear cover, and a plurality of air outlets are respectively located on both sides of the casing.

[0009] Preferably, a partition is fixedly connected inside the box body. The partition divides the inside of the box body into a first chamber and a second chamber. The first chamber is located above the second chamber. The cooling fan is communicated with the inside of the first chamber. The alternative dehumidification component is located inside the first chamber and extends into the second chamber. An opening is formed at the rear side of the box body, and the opening is communicated with the first chamber. A first protective net is fixedly connected inside the opening.

[0010] Preferably, the alternative dehumidification component includes two activated carbon boxes distributed front and back and two motors distributed left and right. The two activated carbon boxes are respectively located inside the first chamber and the second chamber. The motors are fixedly connected to the bottom of the box body. The output shaft of the motor is fixedly connected with a threaded rod. The threaded rod is located inside the second chamber, and the top of the threaded rod and the bottom of the partition are movably connected through bearings. The bottom of the activated carbon box is fixedly connected with a connecting plate. The threaded rod penetrates through the connecting plate, and the connecting plate is in threaded connection with the threaded rod.

[0011] Preferably, the activated carbon box is composed of a solid frame and two mesh plates. The mesh plates are fixedly connected inside the solid frame. The inside of the activated carbon box is filled with activated carbon. The activated carbon is located between the two mesh plates. The connecting plate is fixed to the bottom of the solid frame.

[0012] Preferably, two fitting grooves one adapted to the top of the solid frame are formed on the inner top wall of the box body. Fitting grooves two adapted to both sides of the solid frame are formed on both sides inside the box body. The activated carbon box is slidably connected inside the box body through the fitting grooves two. Two through holes are formed on the top of the partition. The activated carbon box penetrates through the through holes.

[0013] Preferably, a communication port is formed at the front side of the bottom of the base. A partition net is fixedly connected inside the communication port. The dehumidification device further includes a duct. The duct is fixedly connected to the bottom of the base and extends to the rear side of the chassis. The end of the duct penetrates through the box body and extends into the second chamber. The duct is located in front of the alternative dehumidification component. The communication port is located above the duct. The duct is communicated with the inside of the chassis through the communication port. A notch is formed at the rear side of the base. The duct penetrates through the notch. A lower air duct is fixedly connected to the rear side of the bottom of the box body. The lower air duct is communicated with the inside of the second chamber. A second protective net is fixedly connected inside the lower air duct.

[0014] Preferably, the plugging device includes a baffle located directly in front of the cooling fan. One L-shaped bracket is fixedly connected to each side of the baffle. A tension spring is fixedly connected between the L-shaped bracket and the rear machine cover. A push rod is fixedly connected to the front side of the end of the tension spring. A grille plate is fixedly connected to the front side of the push rod. The two grille plates are respectively slidably connected to both sides inside the casing to block the air outlet.

[0015] Preferably, a plurality of sliding seats are sleeved on the outer end of the push rod. The sliding seats are fixedly connected to the inner side wall of the casing. The push rod is slidably connected to the inner side wall of the casing through the sliding seats. Two vertically distributed limiting sliding sleeves are respectively fixedly connected to both sides inside the casing. The air outlet is located between two adjacent upper and lower limiting sliding sleeves. The grille plate is slidably connected to the inner side wall of the casing through two adjacent upper and lower limiting sliding sleeves.

[0016] Preferably, the grille plate is composed of a frame and a plurality of plugging plates. The plugging plates are fixedly connected inside the frame, and the frame blocks the air outlet.

[0017] Compared with the related art, an inverter DC arc welder with a high duty cycle provided by the present invention has the following beneficial effects:

[0018] 1. When the cooling fan blows air into the chassis for heat dissipation, the external air needs to enter the first chamber of the box body and be dehumidified by the alternating dehumidification component before entering the chassis, thus avoiding damage such as corrosion or short circuit of the circuit components in the chassis caused by humid air, with high safety and improving the service life of the machine;

[0019] 2. Through the communication port and the air duct, a part of the hot air inside the chassis can be discharged. This part of the hot air will enter the second chamber to dry the activated carbon in one of the activated carbon boxes of the alternating dehumidification component located inside it, and finally be discharged through the lower air duct. This process enables the alternating dehumidification component to always have available dry activated carbon to dehumidify the air, without the need to take it out and replace it, which is very convenient to use;

[0020] 3. Most of the hot air inside the chassis can be discharged through the air outlet. When the machine stops running and does not need heat dissipation, the grille plate in the plugging device will block the air outlet to prevent the external air from entering the inside through the air outlet, which can also avoid the entry of humid air or dust into the chassis, with high protection. When running, the cooling fan will blow the plugging device to move, exposing the air outlet for exhaust, adapting to work, and being very convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure from the first perspective of the present invention;

[0022] Figure 2Schematic diagram of the overall structure from the second perspective of the present invention;

[0023] Figure 3 Explosion diagram of the chassis of the present invention;

[0024] Figure 4 Schematic diagram of the front view sectional structure of the dehumidification device of the present invention;

[0025] Figure 5 Schematic diagram of the front view sectional structure of the box body of the present invention;

[0026] Figure 6 Schematic diagram of the structure of the alternating dehumidification component of the present invention;

[0027] Figure 7 Schematic diagram of the structure of the plugging device located inside the chassis of the present invention;

[0028] Figure 8 Schematic diagram of the structure of the plugging device of the present invention;

[0029] Figure 9 Schematic diagram of the structure of the plugging plate of the present invention.

[0030] Reference numerals in the figure: 1, chassis; 11, housing; 111, air outlet; 12, base; 121, communication port; 122, notch; 123, partition net; 13, front cover; 14, rear cover; 15, cooling fan; 2, dehumidification device; 21, box body; 22, partition board; 23, first chamber; 24, second chamber; 25, lower air duct; 26, first embedding groove; 27, second embedding groove; 29, through hole; 210, activated carbon box; 2101, solid frame; 2102, mesh board; 211, activated carbon; 212, connecting plate; 213, threaded rod; 214, motor; 215, air guide pipe; 216, first protection net; 217, second protection net; 3, plugging device; 31, baffle; 32, L-shaped bracket; 33, tension spring; 34, push-pull rod; 35, sliding seat; 36, grille board; 361, frame; 362, plugging plate; 37, limit sliding sleeve. Detailed implementation manners

[0031] Example 1, given by Figures 1-9 The present invention includes a chassis 1, a plurality of air outlets 111 are provided on both sides of the chassis 1, a dehumidification device 2 is installed at the rear of the chassis 1, the dehumidification device 2 includes a box body 21, the box body 21 is fixedly connected to the rear of the chassis 1, an alternating dehumidification component is installed inside the box body 21, a plugging device 3 is installed inside the chassis 1, the plugging device 3 blocks the air outlets 111, during the operation of the device, through the heat dissipation treatment of the cooling fan 15, and then through the cooperation of the dehumidification device 2 and the plugging device 3, the device can have a long service life.

[0032] The chassis 1 is composed of a chassis housing 11, a base 12, a front cover 13, a rear cover 14 and a cooling fan 15. The chassis housing 11 is fixedly connected to the top of the base 12 by bolts. The front cover 13 and the rear cover 14 are respectively fixedly connected to the front and rear sides of the chassis housing 11 by screws. The cooling fan 15 is embedded and connected to the rear cover 14. A plurality of air outlets 111 are respectively located on both sides of the chassis housing 11. The chassis 1 formed by the chassis housing 11, the base 12, the front cover 13 and the rear cover 14 is a conventional chassis structure, so it will not be elaborated here. The cooling fan 15 is suitable for dissipating heat from the circuit components inside the chassis 1.

[0033] A partition 22 is fixedly connected inside the box body 21. The partition 22 divides the interior of the box body 21 into a first chamber 23 and a second chamber 24. The first chamber 23 is located above the second chamber 24. The cooling fan 15 is in communication with the interior of the first chamber 23. The alternating dehumidification component is located inside the first chamber 23 and extends into the second chamber 24. An opening is provided at the rear side of the box body 21. The opening is in communication with the first chamber 23, and a first protective net 216 is fixedly connected inside the opening. The opening enables external air to be sucked by the cooling fan 15 into the first chamber 23 to be dehumidified by the alternating dehumidification component, and the first protective net 216 can prevent mosquitoes, dust, etc. from entering the first chamber 23 and affecting.

[0034] The alternating dehumidification component includes two activated carbon boxes 210 distributed front and rear and two motors 214 distributed left and right. The two activated carbon boxes 210 are respectively located inside the first chamber 23 and the second chamber 24. The motor 214 is fixedly connected to the bottom of the box body 21. The output shaft of the motor 214 is fixedly connected with a threaded rod 213. The threaded rod 213 is located inside the second chamber 24, and the top of the threaded rod 213 and the bottom of the partition 22 are movably connected by bearings. The bottom of the activated carbon box 210 is fixedly connected with a connecting plate 212. The threaded rod 213 penetrates through the connecting plate 212, and the connecting plate 212 is threadedly connected with the threaded rod 213. The cooperation of the two motors 214, the two threaded rods 213 and the two connecting plates 212 can drive the two activated carbon boxes 210 to move up and down alternately, so that the activated carbon 211 in the two activated carbon boxes 210 can be respectively located in the first chamber 23 to dehumidify the air, and located in the second chamber 24 to be dried by hot air.

[0035] The activated carbon box 210 is composed of a solid frame 2101 and two mesh plates 2102. The mesh plates 2102 are fixedly connected inside the solid frame 2101. The activated carbon box 210 is filled with activated carbon 211. The activated carbon 211 is located between the two mesh plates 2102. The connecting plate 212 is fixed to the bottom of the solid frame 2101. The fixing method of the mesh plate 2102 on the solid frame 2101 can be screw fixation or snap fixation. This fixing method is detachable to facilitate the replacement of the activated carbon 211 filter material in the later stage. In addition to the activated carbon 211, filter materials such as silica gel that do not affect air circulation and can also dehumidify can also be used. After fixed assembly, it can be used to hold the activated carbon 211. The characteristics of the activated carbon 211 enable it to adsorb the humid moisture in the air to achieve the dehumidification treatment of the air. At the same time, its structure is loose and does not affect the air circulation.

[0036] Two fitting grooves one 26 adapted to the top of the solid frame 2101 are provided on the inner top wall of the box body 21. Fitting grooves two 27 adapted to both sides of the solid frame 2101 are provided on both sides inside the box body 21. The activated carbon box 210 is slidably connected inside the box body 21 through the fitting grooves two 27. Two through holes 29 are provided at the top of the partition plate 22. The activated carbon box 210 passes through the through holes 29. The fitting grooves one 26 and the fitting grooves two 27 can make the activated carbon box 210 fit tightly with the inner wall of the first chamber 23, avoiding air passing through the side of the activated carbon box 210 and not being dehumidified and filtered by the activated carbon 211 inside. At the same time, the fitting groove 27 can also limit and guide the up and down movement of the activated carbon box 210 to prevent it from tilting. At the same time, it can also limit its maximum downward movement stroke, so that when the activated carbon box 210 moves down to the maximum distance, its top can just block the through hole 29, and the top wall of the activated carbon box 210 is flush with the bottom wall of the first chamber 23, which can not only prevent the air in the first chamber 23 from entering the second chamber 24 through the through hole 29, but also prevent the air flowing in the first chamber 23 from being disturbed.

[0037] A communication port 121 is provided at the front side of the bottom of the base 12. A partition net 123 is fixedly connected inside the communication port 121. The dehumidification device 2 further includes a duct 215. The duct 215 is fixedly connected to the bottom of the base 12 and extends to the rear side of the chassis 1. The end of the duct 215 penetrates the box body 21 and extends into the second chamber 24. The duct 215 is located in front of the alternating dehumidification component. The communication port 121 is located above the duct 215. The duct 215 is communicated with the inside of the chassis 1 through the communication port 121. A notch 122 is provided at the rear side of the base 12. The duct 215 penetrates the notch 122. A lower air duct 25 is fixedly connected to the rear side of the bottom of the box body 21. The lower air duct 25 is communicated with the inside of the second chamber 24. A second protective net 217 is fixedly connected inside the lower air duct 25. The cooperation of the communication port 121 and the duct 215 can discharge a part of the hot air in the chassis 1 and introduce it into the second chamber 24 for drying the activated carbon 211. The partition net 123 can prevent the components in the chassis 1 from falling and entering the duct 215 through the communication port 121 and causing blockage. The setting of the notch 122 can prevent the duct 215 from interfering with the base 12. The lower air duct 25 can discharge the hot air in the second chamber 24 downward below the box body 21, avoiding large-area mixing with the air entering the first chamber 23 and resulting in high air temperature and affecting the heat dissipation effect. The second protective net 217 can prevent mosquitoes and other foreign objects from entering the pipeline and the inside of the device through the lower air duct 25 when the device is not operating.

[0038] The two activated carbon boxes 210 in the alternating dehumidification component alternately enter the first chamber 23 and the second chamber 24. For the activated carbon box 210 located in the first chamber 23, the activated carbon 211 inside can be used to dehumidify the air flowing through the first chamber 23. After long-term use, the water content of the activated carbon 211 inside gradually increases, resulting in a decrease in its dehumidification effect. Therefore, it can be replaced into the second chamber 24 and dried by the hot air introduced from the duct 215. Among the two activated carbon boxes 210 in the alternating dehumidification component, the activated carbon 211 in one activated carbon box 210 is always in a usable state. There is no need to manually disassemble and replace the activated carbon 211. Furthermore, during the operation of the device, the dehumidification device 2 can work continuously, and the working efficiency is higher.

[0039] Embodiment 2. On the basis of Embodiment 1, the blocking device 3 includes a baffle 31 which is located directly in front of the cooling fan 15. One L-shaped bracket 32 is fixedly connected to each side of the baffle 31. A tension spring 33 is fixedly connected between the L-shaped bracket 32 and the rear cover 14. A push-pull rod 34 is fixedly connected to the front side of the end of the tension spring 33. A grille plate 36 is fixedly connected to the front side of the push-pull rod 34. The two grille plates 36 are respectively slidably connected to both sides inside the casing 11 to block the air outlet 111. The baffle 31 is small in volume but is located directly in front of the cooling fan 15. Therefore, when the cooling fan 15 operates, the baffle 31 will be blown first, but it will not block all the air blown out by the cooling fan 15, so the heat dissipation effect will not be affected. When the baffle 31 drives the L-shaped bracket 32 to be blown, the tension spring 33 will be stretched to generate an elastic force. The push-pull rod 34 can push the grille plate 36 to move or pull the grille plate 36 back to its original position.

[0040] A plurality of sliding seats 35 are sleeved on the outer end of the push-pull rod 34. The sliding seats 35 are fixedly connected to the inner side wall of the casing 11. The push-pull rod 34 is slidably connected to the inner side wall of the casing 11 through the sliding seats 35. Two upper and lower distributed limit sliding sleeves 37 are respectively fixedly connected to both sides inside the casing 11. The air outlet 111 is located between two adjacent upper and lower limit sliding sleeves 37. The grille plate 36 is slidably connected to the inner side wall of the casing 11 through two adjacent upper and lower limit sliding sleeves 37. The sliding seats 35 can support the push-pull rod 34 while not affecting its forward and backward push-pull movement. The limit sliding sleeves 37 can support the forward and backward sliding of the grille plate 36 while restricting the maximum forward and backward displacement stroke thereof, so that the grille plate 36 can move forward just to expose the air outlet 111 and can just block the air outlet 111 later.

[0041] The grille plate 36 is composed of a frame 361 and a plurality of blocking plates 362. The blocking plates 362 are fixedly connected inside the frame 361, and the frame 361 blocks the air outlet 111. The plurality of blocking plates 362 exactly correspond to the plurality of openings of the air outlet 111 and have a width adaptation.

[0042] When the cooling fan 15 is running, the baffle 31 in the blocking device 3 is blown by the wind and will drive the grille plate 36 to move through the connection between the L-shaped bracket 32 ​​and the push-pull rod 34. When the grille plate 36 moves, the blocking plate 362 used to block the air outlet 111 is offset and no longer blocks the air outlet 111, so that most of the hot air inside the chassis 1 is discharged from the air outlet 111. When the equipment stops running and the cooling fan 15 is not working, the baffle 31 is no longer blown by the wind, and the tension spring 33 will pull the L-shaped bracket 32 ​​so that the baffle 31, the push-pull rod 34 and the grille plate 36 return to their original positions, and the grille plate 36 will block the air outlet 111 again, so that the outside air cannot enter the chassis 1 from the air outlet 111, thereby preventing dust and humid air from entering.

[0043] Working principle:

[0044] When in use, the cooling fan 15 is started to blow air into the chassis 1 to dissipate heat therein, and the air blown into the chassis 1 is finally mainly discharged through the air outlet 111, and a part of it also enters the air guide 215 through the connecting port 121;

[0045] After the cooling fan 15 is started, the external air enters the first chamber 23 through the open port at the rear side of the chassis 1, and then the air passes through the activated carbon box 210 and is filtered and dehumidified by the activated carbon 211 filled therein, and then the dehumidified air is sucked by the cooling fan 15 and blown to the inside of the chassis 1. As the activated carbon 211 inside one of the activated carbon boxes 210 continues to adsorb and dehumidify, its dehumidification capacity will gradually decrease. At this time, the two motors 214 can be started respectively to drive the two threaded rods 213 to rotate, and finally, through the transmission of the connecting plate 212, the activated carbon box 210 located in the first chamber 23 enters the second chamber 24, and vice versa, the activated carbon box 210 originally in the second chamber 24 will enter the first chamber 23, and the activated carbon 211 inside the activated carbon box 210 newly entering the first chamber 23 is in the best working state, and the air can continue to be dehumidified.

[0046] The air inside the chassis 1 is firstly dry, and secondly, it is also hot when it is discharged because it is used for heat dissipation, that is, the air discharged from the chassis 1 is hot air. After the hot air inside the chassis 1 is discharged into the air duct 215 through the connecting port 121, it will eventually enter the second chamber 24, and then be discharged downward from the second chamber 24 through the lower air outlet duct 25. During this period, the activated carbon 211 in the activated carbon box 210 located in the first chamber 23 will be dehydrated by the flowing hot air, so that the activated carbon 211 in the two activated carbon boxes 210 in the alternating dehumidification assembly is always dry and can be used for adsorption and dehumidification.

[0047] When the cooling fan 15 starts to blow air into the chassis 1, the air blown by the cooling fan 15 will first blow the baffle 31 to move it forward, and then the baffle 31 will drive the push-pull rod 34 through the L-shaped bracket 32 to push the grille plate 36 forward until the plugging plate 362 in the grille plate 36 moves away from the inner side of the air outlet 111 and no longer plugs the air outlet 111, so that the hot air in the chassis 1 can be discharged from the air outlet 111. During this period, when the L-shaped bracket 32 moves forward, it will stretch the tension spring 33 to generate elastic force. Therefore, when the device stops working and the cooling fan 15 no longer operates to blow air, there is no wind to push the baffle 31. At this time, the tension spring 33 will pull the L-shaped bracket 32 to move it back to its original position. During this period, the baffle 31, the push-pull rod 34 and the grille plate 36 will all move back to their original positions, and the plugging plate 362 in the grille plate 36 will plug the air outlet 111 again, so that the inside of the chassis 1 is no longer connected to the outside. Therefore, the humid moisture in the air outside the chassis 1 cannot enter the inside of the chassis 1 through the air outlet 111, playing a moisture-proof role.

Claims

1. An inverter direct current arc welding machine with a high duty cycle, characterized in that: It includes a chassis (1), and a plurality of air outlets (111) are provided on both sides of the chassis (1). A dehumidifying device (2) is installed at the rear side of the chassis (1). The dehumidifying device (2) includes a box body (21), the box body (21) is fixedly connected to the rear side of the chassis (1), an alternating dehumidifying component is installed inside the box body (21), and a blocking device (3) is installed inside the chassis (1), and the blocking device (3) blocks the air outlets (111).

2. The inverter DC arc welding machine with a high duty cycle according to claim 1, characterized in that, The chassis (1) is composed of a casing (11), a base (12), a front cover (13), a rear cover (14) and a cooling fan (15). The casing (11) is fixedly connected to the top of the base (12) by bolts. The front cover (13) and the rear cover (14) are respectively fixedly connected to the front and rear sides of the casing (11) by screws. The cooling fan (15) is embedded and connected to the rear cover (14), and a plurality of air outlets (111) are respectively located on both sides of the casing (11).

3. The inverter DC arc welding machine with a high duty cycle according to claim 2, characterized in that, A partition board (22) is fixedly connected inside the box body (21). The partition board (22) divides the interior of the box body (21) into a first chamber (23) and a second chamber (24). The first chamber (23) is located above the second chamber (24). The cooling fan (15) is communicated with the inside of the first chamber (23). The alternating dehumidifying component is located inside the first chamber (23) and extends into the second chamber (24). An opening is provided at the rear side of the box body (21), and the opening is communicated with the first chamber (23), and a first protective net (216) is fixedly connected inside the opening.

4. A high-duty-cycle inverter DC arc welding machine according to claim 3, characterized in that, The alternating dehumidifying component includes two activated carbon boxes (210) distributed front and rear and two motors (214) distributed left and right. The two activated carbon boxes (210) are respectively located inside the first chamber (23) and the second chamber (24). The motors (214) are fixedly connected to the bottom of the box body (21). The output shaft of the motor (214) is fixedly connected with a threaded rod (213). The threaded rod (213) is located inside the second chamber (24), and the top of the threaded rod (213) and the bottom of the partition board (22) are movably connected by bearings. The bottom of the activated carbon box (210) is fixedly connected with a connecting plate (212). The threaded rod (213) penetrates through the connecting plate (212), and the connecting plate (212) is in threaded connection with the threaded rod (213).

5. The inverter DC arc welding machine with a high duty cycle according to claim 4, characterized in that, The activated carbon box (210) is composed of a solid frame (2101) and two mesh plates (2102). The mesh plates (2102) are fixedly connected inside the solid frame (2101). Activated carbon (211) is filled inside the activated carbon box (210). The activated carbon (211) is located between the two mesh plates (2102). The connecting plate (212) is fixed to the bottom of the solid frame (2101).

6. The inverter DC arc welding machine with a high duty cycle according to claim 3, characterized in that, On the inner top wall of the box body (21), two first embedding grooves (26) adapted to the top of the entity frame (2101) are provided. On both sides inside the box body (21), second embedding grooves (27) adapted to both sides of the entity frame (2101) are provided. The activated carbon box (210) is slidably connected inside the box body (21) through the second embedding grooves (27). Two through ports (29) are provided at the top of the partition plate (22), and the activated carbon box (210) penetrates through the through ports (29).

7. A high-duty-cycle inverter DC arc welding machine according to claim 3, characterized in that, A communication port (121) is provided at the front side of the bottom of the base (12). A partition net (123) is fixedly connected inside the communication port (121). The dehumidifying device (2) further includes a duct (215). The duct (215) is fixedly connected to the bottom of the base (12) and extends to the rear side of the chassis (1). The end of the duct (215) penetrates through the box body (21) and extends into the second chamber (24). The duct (215) is located in front of the alternative dehumidifying assembly. The communication port (121) is located above the duct (215). The duct (215) is communicated with the inside of the chassis (1) through the communication port (121). A notch (122) is provided at the rear side of the base (12). The duct (215) penetrates through the notch (122). A lower air outlet duct (25) is fixedly connected to the rear side of the bottom of the box body (21). The lower air outlet duct (25) is communicated with the inside of the second chamber (24). A second protective net (217) is fixedly connected inside the lower air outlet duct (25).

8. The inverter DC arc welding machine with a high duty cycle according to claim 2, characterized in that, The blocking device (3) includes a baffle (31). The baffle (31) is located directly in front of the cooling fan (15). One L-shaped bracket (32) is fixedly connected to each side of the baffle (31). A tension spring (33) is fixedly connected between the L-shaped bracket (32) and the rear cover (14). A push-pull rod (34) is fixedly connected to the front side of the end of the tension spring (33). A grille plate (36) is fixedly connected to the front side of the push-pull rod (34). The two grille plates (36) are respectively slidably connected to both sides inside the casing (11) to block the air outlet (111).

9. A high-duty-cycle inverter DC arc welding machine according to claim 8, characterized in that, A plurality of sliding seats (35) are sleeved on the outer end of the push-pull rod (34). The sliding seats (35) are fixedly connected to the inner side wall of the casing (11). The push-pull rod (34) is slidably connected to the inner side wall of the casing (11) through the sliding seats (35). Two vertically distributed limiting sliding sleeves (37) are respectively fixedly connected to both sides inside the casing (11). The air outlet (111) is located between two adjacent upper and lower limiting sliding sleeves (37). The grille plate (36) is slidably connected to the inner side wall of the casing (11) through two adjacent upper and lower limiting sliding sleeves (37).

10. A high-duty-cycle inverter DC arc welding machine according to claim 8, characterized in that, The grille plate (36) is composed of a frame (361) and a plurality of blocking plates (362). The blocking plates (362) are fixedly connected inside the frame (361), and the frame (361) blocks the air outlet (111).

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