A protective device for robot welding

Abstract

The present invention relates to the field of mechanical welding technology, and specifically to a protective device for robot welding, including a mechanical arm, on which an air pump and a welding head are provided, and also including: a protective component, the protective component including a protective cover connected to the air pump and a baffle arranged on the welding head, the protective cover is provided with an inner cavity for gas circulation and an air extraction groove connected to the inner cavity, the inner wall of the protective cover is provided with an arc-shaped guide bar located in the inner cavity, and the arc-shaped guide bar is arranged corresponding to the air extraction groove, and the baffle is provided with a scraper matched with the arc-shaped guide bar, and the scraper is used to guide the protective cover to rotate so that the air extraction groove and the baffle are misaligned. The present invention effectively reduces the damage to workers caused by the strong light and harmful gases generated by welding, improves protection, prevents metal particles from contacting the filter when they are not completely cooled and causing the filter to be blocked, and maintains the continuous and stable filtering performance of the filter; automatically controls the opening and closing of the air extraction pump, reduces energy consumption, and is energy-saving and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical welding, and in particular to a protective device used for robot welding. Background Art

[0002] Welding robots are widely used in automobile manufacturing, which greatly improves the processing efficiency of automobile parts and ensures the quality.

[0003] At present, most of the automobile parts welding manipulators on the market will generate strong light due to strong current during welding. If there are construction workers on site, the strong light flashes, and the construction workers are affected by the strong light for a long time, which will inevitably cause damage to the eyes of the construction workers. For this reason, the China Patent Network has disclosed a publication number of CN111015032B, and the name is a welding manipulator for automobile parts with protective function. Through the provided rotating ring, connecting plate, sliding rod, card block, limit spring, protective cover and fixed block, when the welding head is welding, the protective cover will block the welding part, and at the same time, the protective cover will filter out infrared and ultraviolet rays harmful to human eyes generated by electric welding, and at the same time, the strong light will be weakened to weak light that human eyes can bear, effectively protecting people's eyes, and having a good protective effect. On the other hand, through the provided processing box, filter plate, fan, air inlet pipe, air outlet pipe, air outlet and activated carbon plate, the exhaust gas generated by welding can be recycled and processed to avoid the threat of harmful gases to the life safety of construction workers and avoid pollution of the environment.

[0004] There are still some deficiencies in the above-mentioned public documents: First, since a large amount of molten metal particles and harmful fumes will be generated during the welding process, they will be directly spattered onto the workpiece during welding. After these metal particles come into contact with the workpiece before they are completely cooled, they will adhere to the surface of the workpiece. For welding workpieces with high precision requirements, the metal particles generated by welding will directly affect the welding quality, cause welding defects, and reduce welding efficiency. On the other hand, during welding, the exhaust gas treatment device only extracts gas through the suction hood on one side of the top of the protective device. The gas extraction is insufficient, and it needs to be kept open, which increases the energy consumption during welding. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a protective device for robot welding, which can effectively solve the problem in the prior art that the metal particles generated during welding cannot be effectively removed, which easily affects the welding quality.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a protective device for robot welding, comprising a robot arm, wherein the robot arm is provided with an air extraction pump and a welding head, and further comprising:

[0008] A protective component, the protective component includes a protective cover connected to an exhaust pump and a baffle plate arranged on the welding head, the protective cover is provided with an inner cavity for gas circulation and an exhaust groove connected to the inner cavity, the inner wall of the protective cover is provided with an arc-shaped guide bar located in the inner cavity, and the arc-shaped guide bar is arranged corresponding to the exhaust groove, and the baffle plate is provided with a scraper matched with the arc-shaped guide bar, and the scraper is used to guide the protective cover to rotate so that the exhaust groove and the baffle plate are misaligned.

[0009] Furthermore, the protective cover is connected to the vacuum pump through an exhaust pipe, and a filter screen is provided in the inner cavity of the protective cover, and the filter screen is located below the exhaust pipe, and the exhaust pipe is used to filter metal particles generated during welding.

[0010] Furthermore, the baffles are provided in multiple groups and distributed in a circular array on the welding head, the number of inner cavities on the protective cover is the same as the number of baffles, and the width of the baffles is greater than or equal to the width of the inner cavities.

[0011] Furthermore, the distance from the bottom end of the baffle to the bottom end of the protective cover is greater than the distance from the bottom end of the welding head to the bottom end of the protective cover.

[0012] Furthermore, the scraper is arranged on the baffle through a movable column, and the movable column is rotatably connected to the baffle.

[0013] Furthermore, the arc-shaped guide bars are provided in a plurality of groups and correspond to the baffles, and each group is provided with two arc-shaped guide bars, and the arc-shaped guide bars are obliquely arranged on the inner wall of the protective cover.

[0014] Furthermore, a trigger switch electrically connected to the vacuum pump is provided at the top of the arc-shaped guide bar. In the initial state, the scraper on the baffle presses against the trigger switch to turn off the vacuum pump. During welding, the baffle drives the scraper to descend to cancel the squeezing of the trigger switch, thereby turning on the vacuum pump.

[0015] Furthermore, a counterweight bottom cover is provided at the bottom of the protective cover, and the counterweight bottom cover is threadedly connected to the protective cover. The counterweight bottom cover is used to pull the protective cover and the baffle out of position and protect the welding head in the initial state. Beneficial Effects

[0016] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects:

[0017] 1. The protective cover contacts the workpiece, and cooperates with the baffle plate set on the welding head and the arc-shaped guide bar set obliquely in the protective cover, so that the baffle plate rotates while being relatively displaced with the protective cover, exposing the exhaust slot, and cooperates with the exhaust pump to generate negative pressure in the inner cavity, adsorbing and treating the waste gas and particles generated during welding, and cooperates with multiple sets of exhaust slots to draw the gas and metal particles generated during welding of the welding head into the inner cavity, effectively reducing the damage to the workers caused by the strong light and harmful gases generated by welding, and improving protection;

[0018] Second, the arc-shaped guide bar arranged in an inclined manner in the protective cover can prevent the gas from directly passing through the filter, increase the flow path of the gas and metal particles, make the gas and metal particles cool more fully, prevent the metal particles from contacting the filter when they are not completely cooled and causing the filter to be blocked, and maintain the filter's continuous and stable filtering performance;

[0019] 3. When the baffle moves, the scraper is driven to slide on the arc-shaped guide bar to cancel the squeezing of the trigger switch and resist the trigger switch to automatically control the opening and closing of the vacuum pump, so that the equipment turns on the vacuum pump during welding work and turns off the vacuum pump during non-welding work, thereby reducing energy consumption and being energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

[0022] Figure 2 It is a schematic diagram of the explosion structure of the protection component of the present invention;

[0023] Figure 3 For the present invention Figure 2 A in the enlarged view;

[0024] Figure 4 A partial cross-sectional view of the protective cover of the present invention;

[0025] Figure 5 A schematic diagram of the connection between the scraper and the arc-shaped guide strip in the initial state of the present invention;

[0026] Figure 6 For the present invention Figure 5 The enlarged view of point B in the middle;

[0027] Figure 7 It is a schematic diagram of the connection between the scraper and the arc-shaped guide bar in the working state of the present invention.

[0028] Figure numerals: 1. Robotic arm; 11. Vacuum pump; 12. Welding head; 13. Vacuum pipe; 2. Protective assembly; 21. Protective cover; 211. Inner cavity; 212. Vacuum groove; 213. Arc guide bar; 214. Trigger switch; 22. Filter; 23. Counterweight bottom cover; 24. Baffle; 241. Scraper; 242. Movable column. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The present invention will be further described below in conjunction with the embodiments. Example

[0031] A protective device for robot welding, see attached Figure 1-7 , including a robot arm 1, on which is provided an air pump 11 and a welding head 12, and further comprising:

[0032] The protective component 2 is used to prevent the laser generated by welding from causing damage to human eyes and cool down and remove the metal particles generated during welding. The protective component 2 includes a protective cover 21 connected to the vacuum pump 11 and a baffle 24 arranged on the welding head 12. The protective cover 21 is cylindrical, and the welding head 12 and the baffle 24 are located inside the protective cover 21. The protective cover 21 is connected to the vacuum pump 11 through the vacuum pipe 13. The gas in the protective cover 21 is extracted by the vacuum pump 11, so that negative pressure is generated in the protective cover 21, and then the welding gas around the welding head 12 is fully extracted and removed, reducing or even eliminating the escape of harmful gases during welding, and improving the protective effect. The protective cover 21 is provided with an inner pipe for gas flow and extraction. The cavity 211 and the exhaust groove 212 connected to the inner cavity 211, multiple groups of exhaust grooves 212 are extracted at the same time, and when multiple groups of exhaust grooves 212 are set, the aperture of a single exhaust groove 212 can be reduced, the speed of gas extraction can be increased, and the welding gas can be further prevented from escaping. The gas generated during welding is sucked into the inner cavity 211 through the exhaust groove 212, wherein the protective cover 21 is provided with a filter screen 22 located in the inner cavity 211, and the filter screen 22 is located below the exhaust pipe 13. The exhaust pipe 13 is used to filter the metal particles generated during welding, prevent the cooled metal particles from entering the exhaust pipe 13 and the exhaust pump 11, prevent the exhaust pipe 13 from being blocked, and maintain the efficient operation of the exhaust pump 11 and the exhaust pipe 13. The baffles 24 are provided in multiple groups and are distributed in a circular array on the welding head 12. The number of inner cavities 211 on the protective cover 21 is the same as the number of baffles 24, and the width of the baffles 24 is greater than or equal to the width of the inner cavity 211. The baffles 24 are used to cover the exhaust grooves 212 in the initial state. In addition, the distance from the bottom end of the baffle 24 to the bottom end of the protective cover 21 is greater than the distance from the bottom end of the welding head 12 to the bottom end of the protective cover 21, so as to prevent the welding head 12 from driving the baffles 24 to descend and colliding with the workpiece, thereby ensuring that the welding head 12 will not be interfered with by the baffles 24 during welding. On the other hand, a counterweight bottom cover 23 is provided at the bottom of the protective cover 21, and the counterweight bottom cover 23 is threadedly connected to the protective cover 21, and the counterweight bottom cover 23 is threadedly connected to the protective cover 21. The heavy bottom cover 23 can be separated from the protective cover 21, so as to facilitate the cleaning of the inner cavity 211 on the protective cover 21 and remove the metal particles accumulated in the inner cavity 211. At the same time, the counterweight bottom cover 23 is also used to increase the weight of the protective cover 21. The weight of the protective cover 21 is greater than the friction between the baffle 24 and the arc-shaped guide bar 213. That is, in the initial state, the protective cover 21 will drop and move relative to the baffle 24. At the same time, the scraper 241 arranged on the baffle 24 resists the trigger switch 214 to turn off the vacuum pump 11. When the protective cover 21 and the baffle 24 are misaligned, the welding head 12 can also be hidden in the protective cover 21 to protect the welding head 12 and prevent it from being damaged by bumps during movement.

[0033] The inner wall of the protective cover 21 is provided with an arc-shaped guide bar 213 located in the inner cavity 211, and the arc-shaped guide bar 213 is arranged corresponding to the air extraction groove 212, wherein the arc-shaped guide bar 213 is provided with multiple groups and corresponds to the baffle 24, and each group is provided with two arc-shaped guide bars 213, and the arc-shaped guide bars 213 are arranged obliquely on the inner wall of the protective cover 21. The obliquely arranged arc-shaped guide bars 213 can increase the flow path of the gas in the inner cavity 211, so that the movement path of the metal particles mixed in the gas is increased, and the metal particles are fully cooled before contacting the filter screen 22, so as to prevent the molten metal particles from adhering to the filter screen 22 due to insufficient cooling, thereby reducing the probability of the filter screen 22 being blocked and maintaining the stable filtering of the filter screen 22. Performance, the baffle 24 is provided with a scraper 241 that cooperates with the arc-shaped guide bar 213, and the scraper 241 is stuck on the arc-shaped guide bar 213. The scraper 241 cooperates with the arc-shaped guide bar 213 to guide the protective cover 21 and the baffle 24 to rotate relative to each other, so that the exhaust groove 212 and the baffle 24 are misaligned and opened. Further, the scraper 241 is set on the baffle 24 through a movable column 242, and the movable column 242 is rotatably connected to the baffle 24. The scraper 241 rotatably installed on the baffle 24 can better cooperate with the arc-shaped guide bar 213, which greatly reduces the occurrence of jamming, and the mutual cooperation between the baffle 24 and the protective cover 21 is smoother.

[0034] In addition, a trigger switch 214 electrically connected to the vacuum pump 11 is provided at the top of the arc-shaped guide bar 213. The trigger switch 214 turns off the vacuum pump 11 when it is under pressure, and turns on the vacuum pump 11 when the trigger switch 214 is not under pressure. In the initial state, the scraper 241 on the baffle 24 presses against the trigger switch 214 to turn off the vacuum pump 11, that is, in the non-welding state, the vacuum pump 11 does not work. During welding, that is, when the protective cover 21 and the baffle 24 are relatively displaced, the baffle 24 drives the scraper 241 to descend to cancel the squeezing of the trigger switch 214, thereby turning on the vacuum pump 11 for auxiliary welding.

[0035] In the above technical solution, in the initial state and when the welding head 12 leaves the workpiece, the counterweight bottom cover 23 will pull the protective cover 21 downward under the factor of gravity, so that the baffle 24 and the welding head 12 are misaligned in the vertical direction, and the welding head 12 retracts into the protective cover 21. At this time, the baffle 24 moves with the welding head 12, and the scraper 241 on the baffle 24 cooperates with the arc-shaped guide bar 213, so that the baffle 24 and the protective cover 21 rotate relative to each other, thereby blocking the exhaust groove 212. At the same time, the scraper 241 presses against the trigger switch 214 to turn off the exhaust pump 11. On the contrary, when welding is performed, the protective cover 21 first contacts the workpiece As the welding head 12 descends, the baffle 24 and the protective cover 21 arranged on the welding head 12 are misaligned, and the scraper 241 arranged on the baffle 24 slides on the arc guide bar 213 and cancels the squeezing of the trigger switch 214. At this time, the baffle 24 and the protective cover 21 rotate relative to each other to expose the exhaust groove 212. At the same time, the exhaust pump 11 starts to exhaust to extract the harmful gas generated during welding. When the welding head 12 switches between the welding and non-welding states, the scraper 241 on the baffle 24 will circulate on the arc guide bar 213, thereby removing the particles generated by the welding that are adhered to the arc guide bar 213.

[0036] Working principle: The robot arm 1 drives the welding head 12 to the welding position for welding. When welding, the welding head 12 descends. At this time, the protective cover 21 contacts the workpiece first, and then the welding head 12 continues to descend until it contacts the workpiece for welding. In the process that the protective cover 21 abuts the workpiece and the welding head 12 continues to descend, the baffle 24 arranged on the welding head 12 moves relative to the protective cover 21. At this time, the scraper 241 arranged on the baffle 24 slides on the arc-shaped guide bar 213. Since the arc-shaped guide bar 213 is inclined, the baffle 24 rotates while being relatively displaced with the protective cover 21, exposing the exhaust groove 212. At the same time, the scraper 241 cancels When the trigger switch 214 is squeezed, the vacuum pump 11 starts working and cooperates with the vacuum pipe 13 to extract the gas in the protective cover 21. A negative pressure is generated in the inner cavity 211, and cooperates with the multiple groups of vacuum grooves 212 to extract the gas generated by the welding head 12 during welding. While exhausting the gas, the metal particles and harmful smoke generated by welding are sucked into the inner cavity 211. At this time, the inclined arc guide bar 213 can prevent the gas from directly passing through the filter 22, increase the flow path of the gas and metal particles, and make the gas and metal particles cool more fully, prevent the metal particles from contacting the filter 22 when they are not completely cooled, causing the filter 22 to be blocked, and maintain the continuous and stable filtering performance of the filter 22.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A protective device for robot welding, comprising a robot arm (1), wherein the robot arm (1) is provided with an air extraction pump (11) and a welding head (12), characterized in that: Also includes: A protection component (2), the protection component (2) comprising a protection cover (21) connected to an air extraction pump (11) and a baffle (24) arranged on a welding head (12); the protection cover (21) is provided with an inner cavity (211) for gas circulation and an air extraction groove (212) connected to the inner cavity (211); the protection cover (21) is connected to the air extraction pump (11) via an air extraction pipe (13); and the protection cover (21) is provided with a filter screen (22) located in the inner cavity (211); the filter screen (22) is located below the air extraction pipe (13); and the air extraction pipe (13) is used to filter gas generated during welding. The protective cover (21) has an inner wall provided with an arc-shaped guide bar (213) located in the inner cavity (211), and the arc-shaped guide bar (213) is arranged corresponding to the air extraction groove (212), and the baffle (24) is provided with a scraper (241) matched with the arc-shaped guide bar (213), and the scraper (241) is used to guide the protective cover (21) to rotate so that the air extraction groove (212) and the baffle (24) are misaligned, and the baffle (24) is provided with a plurality of groups and distributed in an annular array on the welding head (12), the number of the inner cavities (211) on the protective cover (21) is the same as the number of the baffles (24), and the baffles ( The width of the baffle (24) is greater than or equal to the width of the inner cavity (211); the distance between the bottom end of the baffle (24) and the bottom end of the protective cover (21) is greater than the distance between the bottom end of the welding head (12) and the bottom end of the protective cover (21); the scraper (241) is arranged on the baffle (24) through a movable column (242), and the movable column (242) is rotatably connected to the baffle (24); the arc-shaped guide strips (213) are provided in a plurality of groups corresponding to the baffle (24), and each group is provided with two; the arc-shaped guide strips (213) are obliquely arranged on the inner wall of the protective cover (21); the top end of the arc-shaped guide strips (213) is provided with a draw bar The air pump (11) is electrically connected to a trigger switch (214); in an initial state, a scraper (241) on the baffle (24) presses against the trigger switch (214) to turn off the air pump (11); during welding, the baffle (24) drives the scraper (241) to descend to cancel the squeezing of the trigger switch (214), thereby turning on the air pump (11); a counterweight bottom cover (23) is provided at the bottom of the protective cover (21), and the counterweight bottom cover (23) is threadedly connected to the protective cover (21); the counterweight bottom cover (23) is used to pull the protective cover (21) and the baffle (24) out of position in the initial state and protect the welding head (12).

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