A mesh frame screen welding device and a method for welding a mesh frame screen using the same

Abstract

The application discloses a kind of net rack screen welding device and the method for welding net rack screen using the device, and the positioning disc assembly is equipped above welding support, and lifting mechanism for driving positioning disc assembly vertical movement is equipped on welding support;Welding support is movably connected with support frame, support frame is equipped with screen pressing plate, and screen pressing plate can be compacted to the outer edge of screen laid on annular net rack;Support frame is equipped with welding mechanism, and welding mechanism includes eccentric rotating arm rotatably arranged on support frame;Two ends of eccentric rotating arm are connected with roller welding unit, and the welding roller of two side ends roller welding unit respectively rolls and abuts with the outer circle welding surface and the inner circle welding surface of net rack screen;The application has the advantages of simultaneously completing continuous welding to the inner and outer two annular welding surfaces of net rack screen, high welding processing efficiency, high welding processing quality and the like.

Description

Technical Field

[0001] This invention relates to the field of wire mesh welding technology, specifically to a wire mesh welding device and a method for welding wire mesh using the device. Background Technology

[0002] Vibrating screens are widely used material grading equipment in industries such as mining, metallurgy, and chemicals. The screen mesh, as its core working component, requires the woven metal mesh to be welded onto a ring-shaped frame. Currently, the welding of the frame and the screen mesh is mainly accomplished using roll welding equipment.

[0003] In existing technologies, such as the automatic roll welding machine for mesh screens disclosed in patent publication number CN119566488A, a single welding wheel is used to weld the screen and the mesh frame. During welding, a rotating mechanism drives the entire hollow platform and mesh frame to rotate, and the radial feed of the welding wheel completes the welding of the annular weld. However, the above-mentioned existing technology still has the following shortcomings: its single welding wheel can only weld one annular welding surface at a time. When the mesh screen has both outer and inner circular welding surfaces, welding needs to be performed in two stages—first completing the welding of one annular surface, and then adjusting the position of the welding wheel to complete the welding of the other annular surface. It is impossible to achieve synchronous welding of the inner and outer circular welding surfaces, which not only leads to low welding efficiency, but also easily causes positional deviations between the two welding operations, affecting the relative positional accuracy and consistency of the inner and outer circular welds. In addition, this roll welding machine lacks an active adjustment function for the screen tension, and the screen is prone to loosening or wrinkling during the welding process, affecting the welding quality. Summary of the Invention

[0004] The technical problem this invention aims to solve is to overcome the shortcomings of existing methods and provide a welding device for mesh frames and a method for welding mesh frames using this device. This device can simultaneously and continuously weld the inner and outer annular welding surfaces of the mesh frame, resulting in high welding efficiency and quality. It avoids positional deviations caused by the need for repositioning during secondary welding of the mesh frame, ensuring the relative positional accuracy and consistency of the weld seams on the inner and outer circles of the mesh frame. Furthermore, it allows for adjustment of the mesh tension, ensuring uniform tension on the annular mesh frame and effectively preventing wrinkles, loosening, or displacement of the mesh during welding, further guaranteeing welding quality. This invention effectively solves the problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a wire mesh welding device, comprising a welding bracket, a support plate on the welding bracket, a positioning disk assembly for positioning and supporting an annular wire mesh frame above the support plate, and a lifting mechanism for driving the positioning disk assembly to move vertically on the support plate; the welding bracket also comprises a cover plate assembly, the cover plate assembly comprising a support frame movably mounted on the welding bracket, a wire mesh pressing plate on the support frame, the wire mesh pressing plate being able to press the outer edge of the wire mesh laid on the annular wire mesh frame, and a telescopic cylinder for driving the support frame to move between the support frame and the welding bracket; the support frame is provided with a welding mechanism for welding the wire mesh and the annular wire mesh frame, and the welding... The connecting mechanism includes an eccentric rotating arm rotatably mounted on a support frame. The rotation center of the eccentric rotating arm corresponds to the center of the annular mesh frame, and the two ends of the eccentric rotating arm have different lengths from their rotation center. Both ends of the eccentric rotating arm are connected to roller welding units, which are equipped with welding rollers. The welding roller of one end of the roller welding unit rolls and abuts against the outer circular welding surface of the mesh frame screen, while the welding roller of the other end of the roller welding unit rolls and abuts against the inner circular welding surface of the mesh frame screen. When the eccentric rotating arm rotates one revolution, the welding rollers at both ends can complete the welding of the outer and inner circular welding surfaces of the mesh frame screen. The support frame is also equipped with a drive motor for driving the eccentric rotating arm to rotate.

[0006] Furthermore, one side of the support frame is movably connected to the welding bracket via a pin, and the telescopic cylinder can drive the support frame to rotate up and down; the screen plate is fixedly set at the bottom of the support frame, and the screen plate is provided with a clearance hole at the corresponding positioning plate assembly, the diameter of the clearance hole being larger than the outer diameter of the annular screen frame.

[0007] Furthermore, the welding mechanism is located above the screen pressure plate, and the eccentric rotating arm is rotatably connected to the bottom surface of the top frame plate of the support frame through a slewing bearing. The output shaft of the drive motor is equipped with a drive gear, and the drive gear meshes with the gear ring of the slewing bearing.

[0008] Furthermore, the roller welding unit also includes a vertical plate fixed to the end of the eccentric rotating arm. The top and bottom of the vertical plate are respectively provided with a top plate and a bottom plate. A guide shaft is provided between the top plate and the bottom plate. A sliding plate is slidably connected to the guide shaft via a slider. The welding roller is set on the sliding plate. Both sides of the top of the sliding plate are provided with upper ear plates, and both sides of the bottom plate are provided with lower ear plates. A tension spring is provided between the upper ear plate and its corresponding lower ear plate. A lifting cylinder is vertically provided on the vertical plate. A protrusion is provided on the back of the sliding plate. The telescopic end of the lifting cylinder passes through the protrusion downward and is threadedly connected to a limit nut.

[0009] Furthermore, the welding support includes a working ring platform, with multiple legs arranged along its circumference on the bottom surface of the working ring platform. The support plate is a disc-shaped structure and is fixedly disposed between the multiple legs. One end of the support frame is movably connected to the working ring platform of the welding support, and the telescopic cylinder two is movably connected between the working ring platform and the support frame through a connecting seat. After the telescopic end of the telescopic cylinder two retracts, the bottom surface of the screen pressing plate can be tightly fitted with the top surface of the working ring platform. The working ring platform includes a support ring and a fixed frame plate arranged around it. The inner walls of each frame of the fixed frame plate are fixedly fitted with the outer circular surface of the support ring.

[0010] Furthermore, the lifting mechanism is a worm gear lift, and the lifting mechanism is located at the center of the support plate; multiple pressing mechanisms are provided on the upper surface of the support plate around the circumference of the lifting mechanism, and the pressing mechanism includes a telescopic cylinder 1 movably disposed on the top surface of the support plate, the telescopic end of the telescopic cylinder 1 facing the outside of the support plate and movably connected to a pressing plate; the pressing plate has an F-shaped structure, the telescopic end of the telescopic cylinder 1 is movably connected to the bottom end of the vertical plate of the pressing plate, and a hinge seat is provided on the working ring platform at the corresponding pressing plate, and the middle horizontal plate of the pressing plate is movably connected to the working ring platform through the hinge seat; the top horizontal plate of the pressing plate is provided with a pressing elbow, and when the telescopic end of the telescopic cylinder 1 extends, it pushes the pressing plate to swing upward, and the pressing plate can press the screen pressing plate attached to the working ring platform through the pressing elbow.

[0011] Furthermore, the positioning plate assembly includes a lifting plate, the bottom surface of which is fixedly connected to the lifting end of the lifting mechanism. A support plate is provided with multiple guide rods that can slide vertically, and the guide rods are fixedly connected to the bottom surface of the lifting plate. An insulating plate is fixedly provided on the top surface of the lifting plate, and a positioning ring is fixedly provided on the upper surface of the insulating plate. Multiple positioning pins are provided at equal intervals along the circumference of the top surface of the positioning ring. The annular mesh frame can be placed on the positioning ring, and the positioning pins are all in contact with the inner ring surface of the annular mesh frame. Two grounding terminals are also provided on the positioning ring.

[0012] Furthermore, it also includes a rotation angle limiting unit, which includes a limiting sensor 1 and a limiting sensor 2 disposed on the outer edge of the slewing bearing. The limiting sensor 1 and the limiting sensor 2 are located on a straight line, and the length of the limiting sensor 1 is greater than the length of the limiting sensor 2. A lifting cylinder is fixedly installed on the top frame plate of the support frame at the position corresponding to the limiting sensor 1 via a connecting plate. The extension end of the lifting cylinder is vertically downward and connected to a proximity switch sensor 1. A proximity switch sensor 2 is connected on the top frame plate of the support frame at the position corresponding to the limiting sensor 2 via a connecting plate.

[0013] To achieve the above objectives, the present invention also provides the following technical solution: a method for welding a mesh frame screen using the aforementioned mesh frame welding device, comprising the following steps: S1. Place the ring-shaped mesh frame on the positioning plate assembly, and use the positioning plate assembly to position and support the ring-shaped mesh frame. After laying the screen on the ring-shaped mesh frame, a mesh frame screen to be welded is formed. S2. The retraction of the telescopic cylinder pulls the support frame to flip and press down, so that the screen pressure plate fits against the working ring table and presses the outer edge of the screen tightly. S3. The positioning plate assembly and the ring screen frame are raised a certain distance by the lifting mechanism, so that the screen is in a tensioned and flat state on the ring screen frame; at this time, the welding rollers of the roller welding unit roll and abut against the welding surface of the screen frame. S4. The drive motor drives the eccentric rotating arm to rotate. When the eccentric rotating arm rotates, the welding roller of one end of the roller welding unit welds the outer circle welding surface of the mesh frame screen, and the welding roller of the other end of the roller welding unit welds the inner circle welding surface of the mesh frame screen. The eccentric rotating arm stops rotating after rotating one revolution. The welding rollers at both ends simultaneously complete the welding of the outer circle welding surface and the inner circle welding surface of the mesh frame screen. S5. After the mesh frame screen is welded, the positioning plate assembly and the ring mesh frame are lowered to the original position by the lifting mechanism; at the same time, the drive motor drives the eccentric rotating arm to rotate in the opposite direction to the original position; then the telescopic cylinder extends to drive the cover plate assembly to flip up and open, and take away the welded mesh frame screen; follow the above steps to weld the next mesh frame screen.

[0014] Further, in step S1, the annular mesh frame is placed on the positioning ring, and the inner ring surface of the annular mesh frame is positioned in contact with the multiple positioning pins arranged circumferentially on the positioning ring; in step S2, after the screen pressure plate is in contact with the working ring platform, the telescopic cylinder extends and pushes the pressing plate to swing upward, so that the pressing elbow at the top of the pressing plate presses the screen pressure plate; in step S3, the telescopic end of the lifting cylinder extends, and the lower ear plate pulls the upper ear plate and the sliding plate downward through the tension spring, so that the welding roller rolls and abuts against the welding surface of the mesh frame screen; in step S4, when the welding roller starts welding the mesh frame screen, the telescopic end of the lifting cylinder is in the retracted state, and the proximity switch sensor is lifted and cannot sense the limit sensor; at the beginning of welding, the eccentric rotating arm is in the original zero position, and the proximity switch Sensor 2 can detect limit sensor 2. The drive motor drives the gear ring of the slewing bearing to rotate, causing the eccentric rotating arm to rotate. The welding roller welds the screen frame. During the welding process, the lifting cylinder extends and pushes the proximity switch sensor 1 to descend. After the eccentric rotating arm rotates one revolution, the proximity switch sensor 1 detects limit sensor 1, and the drive motor stops driving the eccentric rotating arm to continue rotating in the current direction. In step S5, the drive motor drives the eccentric rotating arm to rotate in the opposite direction. At the same time, the lifting cylinder retracts and pulls the proximity switch sensor 1 up, increasing the sensing distance between it and the limit sensor 1 to the point where it cannot be detected. After the eccentric rotating arm rotates one revolution, the proximity switch sensor 2 detects limit sensor 2, and the drive motor stops driving the eccentric rotating arm to continue rotating in the opposite direction.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. High welding efficiency: By setting two ends of different lengths at both ends of the eccentric rotating arm, the two welding rollers can keep rolling contact with the outer and inner circular welding surfaces of the mesh frame screen, respectively; one rotation of the eccentric rotating arm can simultaneously complete the continuous welding of the inner and outer annular welding surfaces of the mesh frame screen; the synchronous welding of the inner and outer circular welding surfaces of the mesh frame screen greatly improves production efficiency, ensures the relative positional accuracy and consistency of the welds on the inner and outer circles of the mesh frame screen, and guarantees the welding quality; it also significantly shortens the welding cycle.

[0016] 2. Ensure weld flatness: The lifting mechanism drives the positioning plate assembly and the annular mesh frame to rise, which, together with the screen pressure plate, presses the outer edge of the screen. The relative movement between the two allows the screen to obtain uniform tension on the annular mesh frame, enabling active adjustment of the screen tension and effectively preventing wrinkles, loosening, or displacement of the screen during welding. Multiple circumferentially arranged pressing mechanisms ensure that the outer edge of the screen is firmly fixed, preventing loosening during screen tensioning or welding, and further ensuring the quality of welding.

[0017] 3. Adaptive floating welding rollers ensure welding stability: The welding rollers are mounted on a sliding plate that can slide along the guide shaft and are always subjected to elastic pressure by a tension spring. When there are manufacturing tolerances or local unevenness on the welding surface of the annular grid, the welding rollers can adaptively adjust their height according to the undulation of the welding surface under the action of the tension spring, always maintaining a close fit with the welding surface, ensuring stable transmission of welding pressure and welding current, and improving welding quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the welding device of the present invention; Figure 2 This is a side view of the welding apparatus of the present invention; Figure 3 This is a schematic diagram of the welding device cover plate of the present invention in the open state; Figure 4 This is a schematic diagram of the welding bracket structure of the present invention; Figure 5 This is a schematic diagram of the positioning disk assembly structure of the present invention; Figure 6 This is a schematic diagram of the positioning ring structure of the present invention; Figure 7 This is a schematic diagram of the pressing mechanism of the present invention; Figure 8 This is a schematic diagram of the cover plate assembly structure of the present invention; Figure 9 This is a schematic diagram of the welding mechanism structure of the present invention; Figure 10 This is a schematic diagram of the rotation angle limiting unit structure of the present invention; Figure 11 This is a schematic diagram of the roller welding unit structure of the present invention; Figure 12 This is a side view of the roller welding unit of the present invention.

[0019] In the diagram: 1. Welding bracket; 11. Working ring platform; 12. Support leg; 13. Support plate; 14. Support ring; 15. Fixed frame plate; 2. Lifting mechanism; 3. Positioning plate assembly; 31. Lifting plate; 32. Insulating plate; 33. Positioning ring; 331. Positioning pin; 332. Grounding terminal; 34. Guide rod; 4. Clamping mechanism; 41. Telescopic cylinder one; 42. Hinge seat; 43. Clamping plate; 431. Clamping elbow; 5. Cover plate assembly; 51. Screen clamping plate; 511. Clearance hole; 52. Support frame; 53. Telescopic cylinder two; 6. Welding mechanism; 61. Slewing bearing; 62. Eccentric rotating arm; 63. Drive motor; 64. Drive gear; 7. Roller welding unit; 71. Welding roller; 72. Vertical plate; 721. Top plate; 722. Bottom plate; 723. Guide shaft; 73. Slider; 74. Slide plate; 741. Protrusion; 75. Upper ear plate; 76. Lower ear plate; 77. Tension spring; 78. Lifting cylinder; 781. Limit nut; 8. Rotation angle limit unit; 81. Limit sensor one; 82. Proximity switch sensor one; 83. Limit sensor two; 84. Proximity switch sensor two; 85. Lifting cylinder; 9. Circular grid frame. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1 Please see Figure 1-3 and Figure 8-9 A wire mesh welding device includes a welding support 1, which includes a working ring platform 11. Multiple legs 12 are provided on the bottom surface of the working ring platform 11 along its circumference. A disc-shaped support plate 13 is provided between the multiple legs 12. A positioning disk assembly 3 for positioning and supporting the annular wire mesh 9 is provided above the support plate 13. A lifting mechanism 2 for driving the positioning disk assembly 3 to move vertically is provided on the support plate 13. In this embodiment, the lifting mechanism 2 is a worm gear lift, and the lifting mechanism 2 is located at the center of the support plate 13. In this embodiment, the working ring platform 11 includes a support ring 14 and a fixed frame plate 15 surrounding it. The inner walls of each frame of the fixed frame plate 15 are fixedly fitted to the outer circular surface of the support ring 14.

[0022] The welding bracket 1 is also equipped with a cover plate assembly 5. The cover plate assembly 5 includes a support frame 52 movably mounted on the welding bracket 1. One end of the support frame 52 is movably connected to the welding bracket 1 via a pin. A telescopic cylinder 53 is movably connected between the support frame 52 and the working ring platform 11 of the welding bracket 1 via a connecting seat. The telescopic cylinder 53 can drive the support frame 52 to rotate up and down. A screen pressing plate 51 is fixedly mounted on the bottom end of the support frame 52. After the telescopic end of the telescopic cylinder 53 retracts, the bottom surface of the screen pressing plate 51 can be tightly fitted with the top surface of the working ring platform 11, so that the screen pressing plate 51 presses the outer edge of the screen laid on the annular mesh frame 9. Furthermore, the screen pressing plate 51 is provided with a clearance hole 511 at the corresponding positioning plate assembly 3. The diameter of the clearance hole 511 is larger than the outer diameter of the annular screen frame 9. The cover plate assembly 5 is driven to flip by the telescopic cylinder 2 53, so that the screen pressing plate 51 presses the outer edge of the screen. The lifting mechanism 2 causes the positioning plate assembly 3 to drive the annular screen frame 9 to rise, so that the screen gets a uniform tension on the annular screen frame 9, effectively avoiding wrinkles or loosening of the screen during welding and ensuring the flatness of the welding surface. The clearance hole 511 can prevent the screen pressing plate 51 from interfering with the rising positioning plate assembly 3 and the annular screen frame 9, and facilitates the arrangement of welding equipment and the welding of the screen frame.

[0023] The support frame 52 is equipped with a welding mechanism 6 for welding the screen and the annular mesh frame 9. The welding mechanism 6 is located above the screen pressure plate 51. The welding mechanism 6 includes an eccentric rotating arm 62, which is rotatably connected to the bottom surface of the top frame plate of the support frame 52 through a slewing bearing 61. The rotation center of the eccentric rotating arm 62 corresponds to the center of the annular mesh frame 9. The two ends of the eccentric rotating arm 62 have different lengths from their rotation center. Both ends of the eccentric rotating arm 62 are connected to roller welding units 7. The roller welding units 7 are equipped with welding rollers 71. The welding rollers 71 of one end of the roller welding unit 7 roll and abut against the outer circular welding surface of the mesh frame screen, and the welding rollers 71 of the other end of the roller welding unit 7 roll and abut against the inner circular welding surface of the mesh frame screen. The support frame 52 is also equipped with a drive motor 63 for driving the eccentric rotating arm 62 to rotate. The output shaft of the drive motor 63 is equipped with a drive gear 64, and the drive gear 64 meshes with the gear ring of the slewing bearing 61.

[0024] The two ends of the eccentric rotating arm 62 have different lengths from their rotation center, and the lengths from the two ends of the eccentric rotating arm 62 to their rotation center correspond to the outer circle welding surface radius and the inner circle welding surface radius (i.e., the outer circle welding surface radius and the inner circle welding surface radius of the mesh screen) of the annular mesh frame 9, respectively. This allows the welding rollers 71 at both ends of the eccentric rotating arm 62 to roll and contact the outer circle welding surface and the inner circle welding surface of the mesh screen respectively when the eccentric rotating arm 62 rotates one revolution under the drive motor 63, and to simultaneously complete the continuous welding of the two annular welding surfaces. This combines the process that originally needed to be completed in two or more steps into one rotation action, greatly improving the welding efficiency and ensuring the consistency of the inner and outer ring welds.

[0025] Please see Figure 9-12 The roller welding unit 7 further includes a vertical plate 72 fixed to the end of the eccentric rotating arm 62. The top and bottom of the vertical plate 72 are respectively provided with a top plate 721 and a bottom plate 722. A guide shaft 723 is provided between the top plate 721 and the bottom plate 722. A slide plate 74 is slidably connected to the guide shaft 723 via a slider 73. The welding roller 71 is set on the slide plate 74. Both sides of the top of the slide plate 74 are provided with upper ear plates 75, and both sides of the bottom plate 722 are provided with lower ear plates 76. A tension spring 77 is provided between the upper ear plate 75 and its corresponding lower ear plate 76. A lifting cylinder 78 is vertically provided on the vertical plate 72. A protrusion 741 is provided on the back of the slide plate 74. The telescopic end of the lifting cylinder 78 passes through the protrusion 741 downward and is threadedly connected to a limit nut 781. When the welding roller 71 is pressed down and rolls against the mesh screen, the telescopic end of the lifting cylinder 78 extends, and the lower ear plate 76 pulls the upper ear plate 75 and the sliding plate 74 down through the tension spring 77, so that the welding roller 71 rolls against the welding surface of the mesh screen; when the welding roller 71 is lifted and disengaged from rolling against the mesh screen, the telescopic end of the lifting cylinder 78 retracts, and the sliding plate 74 is lifted by the limit nut 781, so that the welding roller 71 disengages from the welding surface.

[0026] Please see Figure 2 , Figure 4 and Figure 7The upper surface of the support plate 13 is provided with multiple pressing mechanisms 4 around the circumference of the lifting mechanism 2. Each pressing mechanism 4 includes a telescopic cylinder 41 movably disposed on the top surface of the support plate 13. The telescopic end of the telescopic cylinder 41 faces outward from the support plate 13 and is movably connected to a pressing plate 43. The pressing plate 43 has an F-shaped structure. The telescopic end of the telescopic cylinder 41 is movably connected to the bottom end of the vertical plate of the pressing plate 43. A hinge seat 42 is provided on the working ring platform 11 at the corresponding pressing plate 43. The middle horizontal plate of the pressing plate 43 is connected to the working ring platform 11 through the hinge seat 42. The clamping plate 43 is connected to the top horizontal plate of the clamping plate 43, which is equipped with a clamping elbow 431. Utilizing the lever principle, when the telescopic end of the telescopic cylinder 41 extends, it pushes the clamping plate 43 to swing upward around the hinge seat 42. The clamping plate 43 can also clamp the screen clamping plate 51 that is attached to the working ring table 11 through the clamping elbow 431. Additional pressure is applied on the basis of the screen clamping plate 51 being attached to the working ring table 11, further ensuring that the outer edge of the screen is firmly fixed. Through multiple circumferentially arranged clamping mechanisms 4, loosening during the tensioning or welding of the screen is prevented.

[0027] Please see Figure 4-6 The positioning disk assembly 3 includes a lifting disk 31, the bottom surface of which is fixedly connected to the lifting end of the lifting mechanism 2. A support plate 13 has multiple vertically sliding guide rods 34, which are fixedly connected to the bottom surface of the lifting disk 31. An insulating disk 32 is fixedly mounted on the top surface of the lifting disk 31. In this embodiment, the insulating disk 32 is made of wood. A positioning ring 33 is fixedly mounted on the upper surface of the insulating disk 32. Multiple positioning pins 331 are evenly spaced along the circumference of the top surface of the positioning ring 33. The outer diameter of the positioning ring 33 matches the outer diameter of the annular mesh frame 9. The annular mesh frame 9 can be placed on the positioning ring 33, and the positioning pins 331 are all in contact with the inner ring surface of the annular mesh frame 9. Two grounding terminals 332 are also provided on the positioning ring 33. The insulating disk 32 is used to electrically isolate the positioning ring 33 from the lifting disk 31.

[0028] Please see Figure 8-10 It also includes a rotation angle limiting unit 8, which includes a limiting sensor 1 81 and a limiting sensor 2 83 disposed on the outer edge of the slewing bearing 61. The limiting sensor 1 81 and the limiting sensor 2 83 are located on a straight line, and the length of the limiting sensor 1 81 is greater than the length of the limiting sensor 2 83. A lifting cylinder 85 is fixedly provided on the top frame plate of the support frame 52 at the position corresponding to the limiting sensor 1 81 by a connecting plate. The extension end of the lifting cylinder 85 is vertically downward and connected to a proximity switch sensor 1 82. A proximity switch sensor 2 84 is connected on the top frame plate of the support frame 52 at the position corresponding to the limiting sensor 2 83 by a connecting plate. In this embodiment, the proximity switch sensor 1 82 is normally open and the proximity switch sensor 2 84 is normally closed.

[0029] Example 2 Please see Figure 1-12 A method for welding a wire mesh frame using the aforementioned wire mesh welding device includes the following steps: S1. Place the annular mesh frame 9 on the positioning ring 33 of the positioning disk assembly 3, and make the inner ring surface of the annular mesh frame 9 fit and position with the multiple positioning pins 331 arranged circumferentially on the positioning ring 33, so that the positioning disk assembly 3 provides positioning support for the annular mesh frame 9, and the screen is laid on the annular mesh frame 9 to form the mesh frame screen to be welded. S2, the telescopic cylinder 2 53 retracts and pulls the support frame 52 to flip and press down, so that the screen pressure plate 51 fits against the working ring table 11 and presses the outer edge of the screen; the telescopic cylinder 1 41 extends and pushes the pressure plate 43 to swing upward, so that the pressure elbow 431 at the top of the pressure plate 43 presses the screen pressure plate 51. S3. The positioning plate assembly 3 and the annular screen frame 9 are driven to rise a certain distance by the lifting mechanism 2, so that the screen is in a tensioned and flat state on the annular screen frame 9. At this time, the telescopic end of the lifting cylinder 78 is extended, and the lower ear plate 76 pulls the upper ear plate 75 and the sliding plate 74 down through the tension spring 77, so that the welding roller 71 rolls and abuts against the welding surface of the screen frame. S4. Drive motor 63 drives eccentric rotating arm 62 to rotate. When eccentric rotating arm 62 rotates, the welding roller 71 of one end of roller welding unit 7 welds the outer circle welding surface of the mesh frame screen, and the welding roller 71 of the other end of roller welding unit 7 welds the inner circle welding surface of the mesh frame screen. When the welding roller 71 starts welding the mesh frame screen, the extension end of the lifting cylinder 85 is in the retracted state, and the proximity switch sensor 1 82 is lifted and cannot sense the limit sensor 1 81. At the start of welding, eccentric rotating arm 62 is in the original zero position, and proximity switch sensor 2 84 can sense... When the limit sensor 83 is activated, the drive motor 63 drives the gear ring of the slewing bearing 61 to rotate, causing the eccentric rotating arm 62 to rotate. The welding roller 71 welds the mesh frame screen. During the welding process of the welding roller 71 on the mesh frame screen, the lifting cylinder 85 extends and pushes the proximity switch sensor 82 to descend. After the eccentric rotating arm 62 rotates one revolution, the proximity switch sensor 82 senses the limit sensor 81, and the drive motor 63 stops driving the eccentric rotating arm 62 to continue rotating in the current rotation direction. The welding rollers 71 at both ends simultaneously complete the welding of the outer circle welding surface and the inner circle welding surface of the mesh frame screen. S5. After the mesh frame screen welding is completed, the lifting cylinder 78 retracts and pulls the slide plate 74 and welding roller 71 upward through the limit nut 781, so that the welding roller 71 is disengaged from the mesh frame screen; the lifting mechanism 2 drives the positioning plate assembly 3 and the annular mesh frame 9 to descend to the original position; at the same time, the drive motor 63 drives the eccentric rotating arm 62 to rotate in the opposite direction, and the lifting cylinder 85 retracts and pulls the proximity switch sensor 1 82 upward, so that the sensing distance between it and the limit sensor 1 81 increases to the point that it cannot be sensed. After the eccentric rotating arm 62 rotates one revolution, the proximity switch sensor 2 84 senses the limit sensor 2 83, and the drive motor 63 stops driving the eccentric rotating arm 62 to continue to reverse; then the telescopic cylinder 2 53 extends and drives the cover plate assembly 5 to flip upward and open, and remove the welded mesh frame screen (the excess screen edge of the mesh frame screen can be cut off by external cutting equipment); the above steps are followed to weld the next mesh frame screen.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wire mesh welding device, comprising a welding support, characterized in that: The welding bracket is equipped with a support plate, and above the support plate is a positioning disk assembly for positioning and supporting the annular mesh frame. The support plate is equipped with a lifting mechanism for driving the positioning disk assembly to move vertically. The welding bracket also includes a cover plate assembly, which comprises a support frame movably mounted on the welding bracket. A screen pressing plate is mounted on the support frame, which can press the outer edge of the screen laid on the annular mesh frame. A telescopic cylinder is provided between the support frame and the welding bracket for driving the movement of the support frame. The support frame is equipped with a welding mechanism for welding the screen and the annular mesh frame. The welding mechanism includes an eccentric rotor rotatably mounted on the support frame. The rotating arm, specifically the eccentric rotating arm, has its rotation center corresponding to the center of the annular mesh frame. The two ends of the eccentric rotating arm have different lengths from their rotation centers. Both ends of the eccentric rotating arm are connected to roller welding units, each equipped with welding rollers. The welding roller of one end of the roller welding unit rolls and abuts against the outer circular welding surface of the mesh frame screen, while the welding roller of the other end rolls and abuts against the inner circular welding surface of the mesh frame screen. As the eccentric rotating arm rotates one revolution, the welding rollers at both ends can complete the welding of both the outer and inner circular welding surfaces of the mesh frame screen. The support frame is also equipped with a drive motor for driving the eccentric rotating arm to rotate.

2. The mesh frame welding device according to claim 1, characterized in that: One end of the support frame is movably connected to the welding bracket via a pin. The telescopic cylinder can drive the support frame to rotate up and down. The screen plate is fixedly set at the bottom of the support frame, and the screen plate is provided with a clearance hole at the corresponding positioning plate assembly. The diameter of the clearance hole is larger than the outer diameter of the annular screen frame.

3. The mesh frame welding device according to claim 1, characterized in that: The welding mechanism is located above the screen pressure plate. The eccentric rotating arm is rotatably connected to the bottom surface of the top frame plate of the support frame through a slewing bearing. The output shaft of the drive motor is equipped with a drive gear, and the drive gear meshes with the gear ring of the slewing bearing.

4. The mesh frame welding device according to claim 1, characterized in that: The roller welding unit also includes a vertical plate fixed to the end of the eccentric rotating arm. The top and bottom of the vertical plate are respectively provided with a top plate and a bottom plate. A guide shaft is provided between the top plate and the bottom plate. A sliding plate is slidably connected to the guide shaft via a slider. The welding roller is set on the sliding plate. Both sides of the top of the sliding plate are provided with upper ear plates, and both sides of the bottom plate are provided with lower ear plates. A tension spring is provided between the upper ear plate and its corresponding lower ear plate. A lifting cylinder is vertically provided on the vertical plate. A protrusion is provided on the back of the sliding plate. The telescopic end of the lifting cylinder passes through the protrusion downward and is threadedly connected to a limit nut.

5. The mesh frame welding device according to claim 1, characterized in that: The welding support includes a working ring platform, with multiple legs along its circumference on the bottom surface of the working ring platform. A support plate is a disc-shaped structure and is fixedly installed between the multiple legs. One end of the support frame is movably connected to the working ring platform of the welding support, and a telescopic cylinder is movably connected between the working ring platform and the support frame through a connecting seat. After the telescopic end of the telescopic cylinder retracts, the bottom surface of the screen pressing plate can be tightly fitted with the top surface of the working ring platform. The working ring platform includes a support ring and a fixed frame plate around it. The inner walls of each frame of the fixed frame plate are fixedly fitted with the outer circular surface of the support ring.

6. The mesh frame welding device according to claim 1, characterized in that: The lifting mechanism is a worm gear lift, and it is located at the center of the support plate. Multiple pressing mechanisms are located on the upper surface of the support plate around the circumference of the lifting mechanism. Each pressing mechanism includes a telescopic cylinder 1 movably mounted on the top surface of the support plate. The telescopic end of the telescopic cylinder 1 faces outwards from the support plate and is movably connected to a pressing plate. The pressing plate has an F-shaped structure. The telescopic end of the telescopic cylinder 1 is movably connected to the bottom end of the vertical plate of the pressing plate. A hinge seat is provided on the working ring platform at the corresponding pressing plate location. The middle horizontal plate of the pressing plate is movably connected to the working ring platform through the hinge seat. The top horizontal plate of the pressing plate has a pressing elbow. When the telescopic end of the telescopic cylinder 1 extends, it pushes the pressing plate upwards, and the pressing plate can press the screen plate against the working ring platform through the pressing elbow.

7. The mesh frame welding device according to claim 1, characterized in that: The positioning plate assembly includes a lifting plate, the bottom surface of which is fixedly connected to the lifting end of the lifting mechanism. A support plate is provided with multiple vertically sliding guide rods, which are fixedly connected to the bottom surface of the lifting plate. An insulating plate is fixedly provided on the top surface of the lifting plate, and a positioning ring is fixedly provided on the upper surface of the insulating plate. Multiple positioning pins are provided at equal intervals along the circumference of the top surface of the positioning ring. An annular mesh frame can be placed on the positioning ring, and the positioning pins are all in contact with the inner ring surface of the annular mesh frame. Two grounding terminals are also provided on the positioning ring.

8. The mesh frame welding device according to claim 3, characterized in that: It also includes a rotation angle limiting unit, which includes a limiting sensor 1 and a limiting sensor 2 disposed on the outer edge of the slewing bearing. The limiting sensor 1 and the limiting sensor 2 are located on a straight line, and the length of the limiting sensor 1 is greater than the length of the limiting sensor 2. A lifting cylinder is fixedly installed on the top frame plate of the support frame at the position corresponding to the limiting sensor through a connecting plate. The extension end of the lifting cylinder is vertically downward and connected to a proximity switch sensor 1. A proximity switch sensor 2 is connected to the top frame plate of the support frame at the position corresponding to the limiting sensor 2 through a connecting plate.

9. A method for welding a wire mesh frame screen using the wire mesh welding device according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Place the ring-shaped mesh frame on the positioning plate assembly, and use the positioning plate assembly to position and support the ring-shaped mesh frame. After laying the screen on the ring-shaped mesh frame, a mesh frame screen to be welded is formed. S2. The retraction of the telescopic cylinder pulls the support frame to flip and press down, so that the screen pressure plate fits with the working ring table and presses the outer edge of the screen tightly. S3. The positioning plate assembly and the ring screen frame are raised a certain distance by the lifting mechanism, so that the screen is in a tensioned and flat state on the ring screen frame; at this time, the welding rollers of the roller welding unit roll and abut against the welding surface of the screen frame. S4. The drive motor drives the eccentric rotating arm to rotate. When the eccentric rotating arm rotates, the welding roller of one end of the roller welding unit welds the outer circle welding surface of the mesh frame screen, and the welding roller of the other end of the roller welding unit welds the inner circle welding surface of the mesh frame screen. The eccentric rotating arm stops rotating after rotating one revolution. The welding rollers at both ends simultaneously complete the welding of the outer circle welding surface and the inner circle welding surface of the mesh frame screen. S5. After the mesh frame screen is welded, the positioning plate assembly and the ring mesh frame are lowered to the original position by the lifting mechanism; at the same time, the drive motor drives the eccentric rotating arm to rotate in the opposite direction to the original position; then the telescopic cylinder extends to drive the cover plate assembly to flip up and open, and take away the welded mesh frame screen; follow the above steps to weld the next mesh frame screen.

10. A method for welding a wire mesh frame screen using a wire mesh frame welding device according to claim 9, characterized in that: In step S1, the annular mesh frame is placed on the positioning ring, and the inner ring surface of the annular mesh frame is positioned in contact with the multiple positioning pins arranged circumferentially on the positioning ring. In step S2, after the screen plate is in contact with the working ring platform, the telescopic cylinder extends and pushes the pressing plate to swing upward, so that the pressing elbow at the top of the pressing plate presses the screen plate. In step S3, the telescopic end of the lifting cylinder extends, and the lower ear plate pulls the upper ear plate and the sliding plate downward through the tension spring, so that the welding roller rolls and abuts against the welding surface of the mesh frame. In step S4, when the welding roller starts welding the mesh frame, the telescopic end of the lifting cylinder is in the retracted state, and the proximity switch sensor is lifted and cannot sense the limit sensor. At the start of welding, the eccentric rotating arm is in the original zero position, and the proximity switch sensor... Device 2 can sense limit sensor 2. The drive motor drives the gear ring of the slewing bearing to rotate, causing the eccentric rotating arm to rotate. The welding roller welds the screen frame. During the welding process, the lifting cylinder extends and pushes the proximity switch sensor 1 to descend. After the eccentric rotating arm rotates one revolution, the proximity switch sensor 1 senses limit sensor 1, and the drive motor stops driving the eccentric rotating arm to continue rotating in the current direction. In step S5, the drive motor drives the eccentric rotating arm to rotate in the opposite direction. At the same time, the lifting cylinder retracts and pulls the proximity switch sensor 1 up, increasing the sensing distance between it and the limit sensor 1 to the point where it cannot be sensed. After the eccentric rotating arm rotates one revolution, the proximity switch sensor 2 senses limit sensor 2, and the drive motor stops driving the eccentric rotating arm to continue rotating in the opposite direction.

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