Automatic welding device for heavy fan mesh enclosure and welding method thereof

Abstract

The automatic welding device comprises an upper mounting platform and a lower mounting platform, an upper welding electrode is arranged on the upper mounting platform, a lower welding electrode is arranged on the lower mounting platform, and the heavy fan mesh enclosure is arranged between the upper welding electrode and the lower welding electrode. The camera shoots an image of the heavy fan mesh enclosure and sends the image to the control unit, and the number of welding points and welding positions are determined according to the image; the lower mounting platform is provided with a cold air output device, the cold air output device is used for rapidly cooling a welding area after welding, and heat accumulation and local stress are reduced; the upper mounting platform is provided with the infrared temperature measuring device which can monitor temperature distribution data of the heavy fan mesh enclosure cooled by cold air, and the control unit determines the position of the next welding point according to the temperature distribution data output by the infrared temperature measuring device, so that the influence of heat accumulation of the previous welding point on the next welding point is avoided.

Description

Technical Field

[0001] The invention relates to the field of automatic arc welding, in particular to an automatic welding device and a welding method for a heavy-duty fan mesh cover. Background Art

[0002] Heavy-duty fan guards are usually composed of multiple components (such as grids, frames, reinforcement ribs, etc.). When welding, it is necessary to ensure accurate docking between the components to avoid misalignment or gaps.

[0003] However, the heat generated during arc welding can cause the material to expand and contract, which can easily cause deformation of the mesh. Especially for large meshes, the deformation problem is more prominent. In the prior art, it is necessary to control the deformation through reasonable welding sequence, fixture fixation, and preheating / post-heat treatment, but the effect is not good and affects the welding efficiency and welding quality. Summary of the invention

[0004] The present invention designs an automatic welding device and a welding method for a heavy-duty fan mesh cover, which solves the technical problem that the heat generated during the welding process of the heavy-duty fan mesh cover in the prior art will cause the material to expand and contract, easily causing the mesh cover to deform, and the traditional control process has the problems of low welding efficiency and poor welding quality.

[0005] In order to solve the above-mentioned technical problems, the present invention adopts the following solutions:

[0006] An automatic welding device for a heavy-duty fan mesh cover comprises an upper mounting platform and a lower mounting platform, wherein an upper welding electrode is arranged on the upper mounting platform, and a lower welding electrode is arranged on the lower mounting platform, and a heavy-duty fan mesh cover is arranged between the upper welding electrode and the lower welding electrode, a camera captures an image of the heavy-duty fan mesh cover and sends it to a control unit, and the control unit determines the number of welding points and welding positions according to the image; the lower mounting platform is provided with a cold air output device, and the cold air output device is used to quickly cool down the welding area after welding to reduce heat accumulation and local stress; the upper mounting platform is provided with an infrared temperature measuring device capable of monitoring the temperature distribution data of the heavy-duty fan mesh cover after cold air cooling, and the control unit determines the position of the next welding point according to the temperature distribution data output by the infrared temperature measuring device, thereby avoiding the influence of the heat accumulation of the previous welding point on the next welding point.

[0007] Preferably, the upper mounting platform includes a first upper movable member and a second upper movable member, the first upper movable member is provided with a vertically arranged first upper rack, the second upper movable member is provided with a vertically arranged second upper rack, the parallelly arranged first upper rack and the second upper rack are connected by an upper transmission gear, and the transmission gear is connected to the rotating shaft of the upper motor through a transmission mechanism or directly to realize clockwise or counterclockwise rotation; an upper welding electrode is provided at the bottom of the first upper movable member, and an infrared temperature measuring device is provided at the second upper movable member; when the rotating shaft of the upper motor rotates clockwise, the upper welding electrode is close to the heavy-duty fan mesh cover, and the infrared temperature measuring device is away from the heavy-duty fan mesh cover; when the rotating shaft of the upper motor rotates counterclockwise, the upper welding electrode is away from the heavy-duty fan mesh cover, and the infrared temperature measuring device is close to the heavy-duty fan mesh cover.

[0008] Preferably, the infrared temperature measuring device is hidden in the second upper movable part through the position control mechanism when the cold air output device is working; after the cold air output device has finished working, the infrared temperature measuring device is located outside the second upper movable part through the position control mechanism.

[0009] Preferably, the position control mechanism comprises an electromagnet, a magnetic body and a stainless steel spring, the second upper moving member is provided with an installation cavity, the left side of the installation cavity close to the first upper moving member is an opening, the right side of the installation cavity is a closing plate, a magnetic body is provided on the right side of the infrared temperature measuring device, a stainless steel spring is provided between the magnetic body and one side of the closing plate, and an electromagnet is provided on the other side of the closing plate;

[0010] When the electromagnet is started, the electromagnet attracts the magnetic body to make the infrared temperature measuring device move toward the closing plate and compress the stainless steel spring at the same time; when the electromagnet is turned off, the stainless steel spring releases the elastic force to push the infrared temperature measuring device out of the installation cavity and locate under the first upper moving part to collect the temperature of the heavy-duty fan mesh cover after the cold air is cooled.

[0011] Preferably, the lower mounting platform includes a first lower moving member and a second lower moving member, the first lower moving member is provided with a vertically arranged first lower rack, the second lower moving member is provided with a vertically arranged second lower rack, the parallelly arranged first lower rack and the second lower rack are connected by a lower transmission gear, and the transmission gear is connected to the rotating shaft of the lower motor through a transmission mechanism or directly to realize clockwise or counterclockwise rotation; a lower welding electrode is provided on the top of the first lower moving member, and a cold air output device is provided on the top of the second lower moving member; when the rotating shaft of the lower motor rotates clockwise, the lower welding electrode is close to the heavy-duty fan mesh cover, and the cold air output device is away from the heavy-duty fan mesh cover; when the rotating shaft of the lower motor rotates counterclockwise, the lower welding electrode is away from the heavy-duty fan mesh cover, and the cold air output device is close to the heavy-duty fan mesh cover.

[0012] Preferably, the upper mounting platform and the lower mounting platform are respectively provided with an X-axis driving device and a Y-axis driving device to achieve arbitrary horizontal positioning, so that the upper welding electrode and the lower welding electrode can reach any welding point of the heavy-duty fan mesh cover.

[0013] Preferably, it also includes a supporting bracket, on which the heavy fan grille is placed, and the supporting bracket can be driven by a rotating motor to achieve 360° rotation.

[0014] A welding method for an automatic welding device for a heavy-duty fan grille comprises the following steps:

[0015] Step 1: The camera captures the image of the heavy fan grille and sends it to the control unit, which determines the number and positions of the welding points according to the image;

[0016] Step 2, the control unit controls the X-direction drive device and the Y-direction drive device of the upper mounting platform and the lower mounting platform according to the positions of the upper welding electrode and the lower welding electrode, so that the upper welding electrode and the lower welding electrode are respectively located directly above and directly below the Nth welding point, where N is a natural number ≥ 1;

[0017] Step 3, start the upper motor to move the upper welding electrode downward to contact the Nth welding point, start the lower motor to move the lower welding electrode upward to contact the Nth welding point, and the upper welding electrode and the lower welding electrode generate an arc to weld the Nth welding point;

[0018] Step 4, after welding, start the lower motor, so that the lower welding electrode is away from the heavy-duty fan mesh cover, the cold air output device is close to the heavy-duty fan mesh cover, and the cold air output device outputs cold air to cool the heavy-duty fan mesh cover for A seconds, A>0;

[0019] Step 5, turn off the lower motor and the cold air output device, turn on the upper motor, make the upper welding electrode away from the heavy-duty fan mesh cover, and the infrared temperature measuring device close to the heavy-duty fan mesh cover;

[0020] Step 6, the infrared temperature measuring device is located outside the second upper moving member (22) through the position control mechanism, and is also located below the first upper moving member to collect the temperature of the heavy-duty fan screen after the cold air is cooled;

[0021] Step 7: The control unit calculates the safe distance from the Nth welding point according to the temperature distribution data output by the infrared temperature measuring device, thereby determining the coordinates of the Mth welding point, M=N+1.

[0022] Preferably, when the Mth welding point needs to be welded, steps 2 to 7 are repeated, wherein the value of N is replaced by M+1, and when all welding points are welded, the welding is completed.

[0023] Preferably, in step 1, the camera captures the image of the heavy fan grille, and determines the number of welding points and welding positions by image processing technology, and the specific steps are:

[0024] Image acquisition: Use a high-resolution camera to capture clear images of heavy-duty fan grilles; Image preprocessing: Improve image quality by removing noise and enhancing contrast; Feature extraction: Use edge detection and template matching technology to identify welding points and positions; Positioning and recognition: Determine the exact position of the welding point through image analysis algorithms; Verification and calibration: Compare with the actual position to ensure recognition accuracy.

[0025] Compared with the prior art, the automatic welding device and welding method for heavy-duty fan grille have the following beneficial effects:

[0026] (1) The present invention detects the temperature of the previous welding point using an infrared temperature measuring device, thereby determining the position of the next welding point based on a safe distance, thereby preventing the heat generated during arc welding from causing material expansion and contraction and causing deformation of the mesh cover.

[0027] (2) The present invention uses an infrared temperature measuring device and a cold air output device to cooperate with each other, quickly cools down the welding area through the cold air output device, and uses an infrared temperature measuring device to check the cooling effect, thus changing the traditional disadvantage of wasting time waiting for cooling, and greatly improving the welding efficiency.

[0028] (3) The sensor of the infrared temperature measuring device of the present invention is sensitive to temperature. If its own temperature changes, it may cause measurement errors. Therefore, it is hidden in the second upper moving part to avoid temperature measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 : A schematic diagram of a first state of an automatic welding device for a heavy-duty fan grille according to the present invention;

[0030] Figure 2 : A schematic diagram of a second state of the automatic welding device for a heavy-duty fan grille according to the present invention;

[0031] Figure 3 : A schematic diagram of a third state of the automatic welding device for a heavy-duty fan grille according to the present invention;

[0032] Figure 4 : Hidden schematic diagram of the infrared temperature measuring device in the present invention;

[0033] Figure 5 : Schematic diagram of the infrared temperature measuring device exposed in the present invention;

[0034] Figure 6 : Schematic diagram of the mobile guiding structure of the infrared temperature measuring device in the present invention.

[0035] Description of reference numerals:

[0036] 1—heavy-duty fan grille; 2—upper mounting platform; 21—first upper moving member; 211—first upper rack; 22—second upper moving member; 221—second upper rack; 222—mounting cavity; 223—guide member; 23—upper transmission gear; 24—upper welding electrode; 3—lower mounting platform; 31—first lower moving member; 311—first lower rack; 32—second lower moving member; 321—second lower rack; 33—lower transmission gear; 34—lower welding electrode; 35—cold air output device; 4—infrared temperature measuring device; 41—electromagnet; 42—magnetic body; 43—stainless steel spring. DETAILED DESCRIPTION

[0037] Combine the following Figures 1 to 6 , the present invention is further described:

[0038] like Figure 1-3 As shown, the automatic welding device for a heavy-duty fan mesh cover of the present invention comprises an upper mounting platform 2 and a lower mounting platform 3, an upper welding electrode 24 is provided on the upper mounting platform 2, a lower welding electrode 34 is provided on the lower mounting platform 3, a heavy-duty fan mesh cover 1 is provided between the upper welding electrode 24 and the lower welding electrode 34, a camera captures an image of the heavy-duty fan mesh cover 1 and sends it to a control unit, and the control determines the number of welding points and welding positions according to the image; the lower mounting platform 3 is provided with a cold air output device 35, and the cold air output device 35 is used to quickly cool down the welding area after welding to reduce heat accumulation and local stress; the upper mounting platform 2 is provided with an infrared temperature measuring device 4 capable of monitoring the temperature distribution data of the heavy-duty fan mesh cover 1 after cold air cooling, and the control unit determines the position of the next welding point according to the temperature distribution data output by the infrared temperature measuring device 4, thereby avoiding the influence of heat accumulation of the previous welding point on the next welding point.

[0039] The upper mounting platform 2 includes a first upper moving member 21 and a second upper moving member 22, the first upper moving member 21 is provided with a vertically arranged first upper rack 211, the second upper moving member 22 is provided with a vertically arranged second upper rack 221, the first upper rack 211 and the second upper rack 221 arranged in parallel are connected by an upper transmission gear 23, and the transmission gear 23 is connected to the rotating shaft of the upper motor through a transmission mechanism or directly to realize clockwise or counterclockwise rotation; an upper welding electrode 24 is provided at the bottom of the first upper moving member 21, and an infrared temperature measuring device 4 is provided at the second upper moving member 22; when the rotating shaft of the upper motor rotates clockwise, the upper welding electrode 24 is close to the heavy-duty fan mesh cover 1, and the infrared temperature measuring device 4 is away from the heavy-duty fan mesh cover 1; when the rotating shaft of the upper motor rotates counterclockwise, the upper welding electrode 24 is away from the heavy-duty fan mesh cover 1, and the infrared temperature measuring device 4 is close to the heavy-duty fan mesh cover 1.

[0040] The lower mounting platform 3 comprises a first lower moving member 31 and a second lower moving member 32. The first lower moving member 31 is provided with a vertically arranged first lower rack 311, and the second lower moving member 32 is provided with a vertically arranged second lower rack 321. The first lower rack 311 and the second lower rack 321 arranged in parallel are connected by a lower transmission gear 33. The transmission gear 33 is connected to the rotating shaft of the lower motor through a transmission mechanism or directly to realize clockwise or counterclockwise rotation; a lower welding electrode 34 is provided on the top of the first lower moving member 31, and a cold air output device 35 is provided on the top of the second lower moving member 32; when the rotating shaft of the lower motor rotates clockwise, the lower welding electrode 34 is close to the heavy-duty fan mesh cover 1, and the cold air output device 35 is away from the heavy-duty fan mesh cover 1; when the rotating shaft of the lower motor rotates counterclockwise, the lower welding electrode 24 is away from the heavy-duty fan mesh cover 1, and the cold air output device 35 is close to the heavy-duty fan mesh cover 1.

[0041] The upper mounting platform 2 and the lower mounting platform 3 are respectively provided with an X-direction driving device and a Y-direction driving device to achieve arbitrary horizontal positioning, so that the upper welding electrode 24 and the lower welding electrode 34 can reach any welding point of the heavy-duty fan mesh cover 1.

[0042] It also includes a support bracket, on which the heavy fan mesh cover 1 is placed, and the support bracket can be driven by a rotating motor to achieve 360° rotation.

[0043] like Figure 4 and Figure 5 As shown, the infrared temperature measuring device 4 is hidden in the second upper moving member 22 through the position control mechanism when the cold air output device 35 is working; after the cold air output device 35 is finished working, the infrared temperature measuring device 4 is located outside the second upper moving member 22 through the action of the position control mechanism. The sensor of the infrared temperature measuring device is sensitive to temperature. If its own temperature changes, that is, it is affected by the cold air output device 35, which may cause measurement errors.

[0044] The position control mechanism includes an electromagnet 41, a magnetic body 42 and a stainless steel spring 43. The second upper movable member 22 is provided with an installation cavity 222. The installation cavity 222 is open on the left side close to the first upper movable member 21. The right side of the installation cavity 222 is a closed plate. A magnetic body 42 is provided on the right side of the infrared temperature measuring device 4. A stainless steel spring 43 is provided between the magnetic body 42 and one side of the closed plate. An electromagnet 41 is provided on the other side of the closed plate. When the electromagnet 41 is started, the electromagnet 41 attracts the magnetic body 42 so that the infrared temperature measuring device 4 moves toward the closed plate and compresses the stainless steel spring 43 at the same time. When the electromagnet 41 is turned off, the stainless steel spring 43 releases its elastic force to push the infrared temperature measuring device 4 out of the installation cavity 222 and is located below the first upper movable member 21 to collect the temperature of the heavy-duty fan mesh cover 1 after the cold air is cooled.

[0045] like Figure 6As shown, a guide groove 223 is further provided at the bottom of the installation cavity 222, and a matching guide groove is provided at the bottom of the infrared temperature measuring device 4 to ensure that the infrared temperature measuring device 4 can stably move horizontally.

[0046] The welding method of the automatic welding device for heavy-duty fan grille of the present invention comprises the following steps:

[0047] Step 1: The camera captures an image of the heavy-duty fan grille 1 and sends it to the control unit, which determines the number and positions of the welding points based on the image.

[0048] Step 2, the control unit controls the X-axis drive device and the Y-axis drive device of the upper mounting platform 2 and the lower mounting platform 3 according to the positions of the upper welding electrode 24 and the lower welding electrode 34, so that the upper welding electrode 24 and the lower welding electrode 34 are respectively located directly above and directly below the Nth welding point, where N is a natural number ≥1.

[0049] Step 3, start the upper motor to move the upper welding electrode 24 downward to contact the Nth welding point, start the lower motor to move the lower welding electrode 34 upward to contact the Nth welding point, and the upper welding electrode 24 and the lower welding electrode 34 generate an arc to weld the Nth welding point.

[0050] Step 4, after welding is completed, start the lower motor, so that the lower welding electrode 24 is away from the heavy-duty fan mesh cover 1, and the cold air output device 35 is close to the heavy-duty fan mesh cover 1, and the cold air output device 35 outputs cold air to cool the heavy-duty fan mesh cover 1 for A seconds, A>0.

[0051] Step 5, turn off the lower motor and the cold air output device 35, turn on the upper motor, so that the upper welding electrode 24 is away from the heavy-duty fan mesh cover 1, and the infrared temperature measuring device 4 is close to the heavy-duty fan mesh cover 1.

[0052] Step 6: The infrared temperature measuring device 4 is located outside the second upper moving member 22 through the position control mechanism, and is also located below the first upper moving member 21 to collect the temperature of the heavy-duty fan mesh cover 1 after the cold air is cooled.

[0053] Step 7: The control unit calculates the safe distance from the Nth welding point according to the temperature distribution data output by the infrared temperature measuring device 4, thereby determining the coordinates of the Mth welding point, M=N+1.

[0054] For example: when the temperature of the first welding point is T℃, the area outside the distance L from the first welding point is the safety distance. In the area outside the safety distance, a nearest welding point is selected as the second welding point.

[0055] When the Mth welding point needs to be welded, steps 2 to 7 are repeated, wherein the value of N is replaced by M+1. When all welding points are welded, the welding is completed.

[0056] In step 1, the camera captures the image of the heavy-duty fan mesh cover 1, and determines the number of welding points and welding positions through image processing technology. The specific steps are: image acquisition: use a high-resolution camera to capture a clear image of the heavy-duty fan mesh cover 1; image preprocessing: improve image quality by denoising and enhancing contrast; feature extraction: use edge detection and template matching technology to identify welding points and positions; positioning and identification: determine the precise position of the welding point through image analysis algorithm; verification and calibration: compare with the actual position to ensure recognition accuracy.

[0057] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An automatic welding device for a heavy-duty fan screen, comprising an upper mounting platform (2) and a lower mounting platform (3), wherein an upper welding electrode (24) is disposed on the upper mounting platform (2), and a lower welding electrode (34) is disposed on the lower mounting platform (3), and a heavy-duty fan screen (1) is disposed between the upper welding electrode (24) and the lower welding electrode (34), wherein: The camera captures an image of the heavy-duty fan grille (1) and sends it to a control unit, which determines the number of welding points and welding positions based on the image; The lower mounting platform (3) is provided with a cold air output device (35), and after welding, the cold air output device (35) is used to quickly cool the welding area to reduce heat accumulation and local stress; The upper mounting platform (2) is provided with an infrared temperature measuring device (4) capable of monitoring the temperature distribution data of the heavy-duty fan mesh cover (1) after cooling by cold air, and the control unit determines the position of the next welding point according to the temperature distribution data output by the infrared temperature measuring device (4), thereby avoiding the influence of heat accumulation of the previous welding point on the next welding point.

2. The automatic welding device for heavy-duty fan grille according to claim 1 is characterized in that: The upper mounting platform (2) comprises a first upper moving member (21) and a second upper moving member (22); the first upper moving member (21) is provided with a first upper rack (211) arranged vertically, and the second upper moving member (22) is provided with a second upper rack (221) arranged vertically; the first upper rack (211) and the second upper rack (221) arranged in parallel are connected via an upper transmission gear (23); the transmission gear (23) is connected to the rotating shaft of the upper motor via a transmission mechanism or directly to realize clockwise rotation or counterclockwise; an upper welding electrode (24) is provided at the bottom of the first upper moving member (21), and an infrared temperature measuring device (4) is provided at the second upper moving member (22); when the rotating shaft of the upper motor rotates clockwise, the upper welding electrode (24) is close to the heavy-duty fan mesh cover (1), and the infrared temperature measuring device (4) is away from the heavy-duty fan mesh cover (1); when the rotating shaft of the upper motor rotates counterclockwise, the upper welding electrode (24) is away from the heavy-duty fan mesh cover (1), and the infrared temperature measuring device (4) is close to the heavy-duty fan mesh cover (1).

3. The automatic welding device for heavy-duty fan grille according to claim 2 is characterized in that: When the cold air output device (35) is working, the infrared temperature measuring device (4) is hidden in the second upper movable member (22) through the position control mechanism; after the cold air output device (35) has finished working, the infrared temperature measuring device (4) is located outside the second upper movable member (22) through the action of the position control mechanism.

4. The automatic welding device for heavy-duty fan grille according to claim 3 is characterized in that: The position control mechanism comprises an electromagnet (41), a magnetic body (42) and a stainless steel spring (43); the second upper movable member (22) is provided with an installation cavity (222); the installation cavity (222) is open on the left side close to the first upper movable member (21); the installation cavity (222) is on the right side of a sealing plate; the magnetic body (42) is provided on the right side of the infrared temperature measuring device (4); a stainless steel spring (43) is provided between the magnetic body (42) and one side of the sealing plate; and an electromagnet (41) is provided on the other side of the sealing plate; When the electromagnet (41) is started, the electromagnet (41) attracts the magnetic body (42) so that the infrared temperature measuring device (4) moves toward the closing plate and compresses the stainless steel spring (43) at the same time; when the electromagnet (41) is turned off, the stainless steel spring (43) releases its elastic force to push the infrared temperature measuring device (4) out of the installation cavity (222) and is located below the first upper moving member (21) to collect the temperature of the heavy-duty fan mesh cover (1) after the cold air is cooled.

5. The automatic welding device for heavy-duty fan grille according to claim 4 is characterized in that: The lower mounting platform (3) comprises a first lower moving member (31) and a second lower moving member (32); the first lower moving member (31) is provided with a first lower rack (311) arranged vertically, and the second lower moving member (32) is provided with a second lower rack (321) arranged vertically; the first lower rack (311) and the second lower rack (321) arranged in parallel are connected via a lower transmission gear (33); the transmission gear (33) is connected to the rotating shaft of the lower motor through a transmission mechanism or directly to realize clockwise or counterclockwise rotation. The needle rotates; a lower welding electrode (34) is provided on the top of the first lower moving member (31), and a cold air output device (35) is provided on the top of the second lower moving member (32); when the rotating shaft of the lower motor rotates clockwise, the lower welding electrode (34) is close to the heavy-duty fan mesh cover (1), and the cold air output device (35) is away from the heavy-duty fan mesh cover (1); when the rotating shaft of the lower motor rotates counterclockwise, the lower welding electrode (24) is away from the heavy-duty fan mesh cover (1), and the cold air output device (35) is close to the heavy-duty fan mesh cover (1).

6. The automatic welding device for heavy-duty fan grille according to claim 5 is characterized in that: The upper mounting platform (2) and the lower mounting platform (3) are respectively provided with an X-direction driving device and a Y-direction driving device to achieve arbitrary positioning in the horizontal direction, thereby enabling the upper welding electrode (24) and the lower welding electrode (34) to reach any welding point of the heavy-duty fan mesh cover (1).

7. The automatic welding device for heavy-duty fan grille according to claim 6 is characterized in that: It also includes a support bracket, on which a heavy fan screen (1) is placed, and the support bracket can be driven by a rotary motor to achieve 360° rotation.

8. A welding method for an automatic welding device for a heavy-duty fan grille according to any one of claims 6 to 7, comprising the following steps: Step 1: A camera captures an image of a heavy-duty fan grille (1) and sends the image to a control unit, which determines the number and positions of welding points based on the image; Step 2, the control unit controls the X-direction drive device and the Y-direction drive device of the upper mounting platform (2) and the lower mounting platform (3) according to the positions of the upper welding electrode (24) and the lower welding electrode (34), so that the upper welding electrode (24) and the lower welding electrode (34) are respectively located directly above and directly below the Nth welding point, where N is a natural number ≥ 1; Step 3, starting the upper motor so that the upper welding electrode (24) moves downward to contact the Nth welding point, starting the lower motor so that the lower welding electrode (34) moves upward to contact the Nth welding point, and the upper welding electrode (24) and the lower welding electrode (34) generate an arc to weld the Nth welding point; Step 4: After welding is completed, the lower motor is started, so that the lower welding electrode (24) is away from the heavy-duty fan mesh cover (1), and the cold air output device (35) is close to the heavy-duty fan mesh cover (1). The cold air output device (35) outputs cold air to cool the heavy-duty fan mesh cover (1) for A seconds, where A>0; Step 5, turn off the lower motor and the cold air output device (35), turn on the upper motor, so that the upper welding electrode (24) is away from the heavy-duty fan mesh cover (1), and the infrared temperature measuring device (4) is close to the heavy-duty fan mesh cover (1); Step 6, the infrared temperature measuring device (4) is located outside the second upper moving member (22) through the position control mechanism, and is also located below the first upper moving member (21) to collect the temperature of the heavy-duty fan screen (1) after the cold air is cooled; Step 7: The control unit calculates the safe distance from the Nth welding point according to the temperature distribution data output by the infrared temperature measuring device (4), thereby determining the coordinates of the Mth welding point, M=N+1.

9. The welding method of the automatic welding device for heavy-duty fan grille according to claim 8, characterized in that: When the Mth welding point needs to be welded, steps 2 to 7 are repeated, wherein the value of N is replaced by M+1. When all welding points are welded, the welding is completed.

10. The welding method of the automatic welding device for heavy-duty fan grille according to claim 8, characterized in that: In step 1, the camera captures an image of the heavy fan grille (1), and determines the number of welding points and welding positions through image processing technology. The specific steps are as follows: Image acquisition: Use a high-resolution camera to capture a clear image of the heavy fan grille (1); Image preprocessing: Improve image quality by removing noise and enhancing contrast; Feature extraction: Use edge detection and template matching technology to identify welding points and positions; Positioning and identification: Determine the exact location of the welding point through image analysis algorithms; Verification and calibration: Compare with actual position to ensure recognition accuracy.

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