Welding device for local precise connection of sheet metal parts of sweeper

Abstract

The invention relates to the technical field of welding, and discloses a welding device for local precise connection of sweeper sheet metal parts, the welding device comprises a welding part and a positioning part, the positioning part comprises an upper clamp and a lower clamp, the lower clamp comprises a positioning plate, a rotating part is arranged at the bottom end of the positioning plate, and an inner supporting part is arranged in the middle of the top end of the positioning plate. The upper clamp comprises a positioning frame connected with the outer wall of the positioning plate in a clamped mode, an outer pressing piece is arranged at the upper section position of the inner wall of the positioning frame, and the outer pressing piece and the inner supporting piece jointly cooperate to position the sheet metal part. According to the device, the inner supporting piece and the outer pressing piece are arranged, after a sheet metal part is placed on the surface of the positioning plate to be preliminarily fixed, the controller controls the telescopic rod to stretch, the telescopic rod drives the abutting plate to move till the abutting plate makes contact with the side edge of the sheet metal part, the inner supporting piece provides supporting force from the interior, and the outer pressing piece applies pressure from the exterior; and the sheet metal part can be effectively prevented from being deformed due to uneven stress.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, and particularly relates to a welding device for local precision connection of sheet metal parts of a floor sweeper. Background Art

[0002] By applying advanced welding technology, local welding operations are carried out on various sheet metal parts of the floor sweeper to ensure that the connection parts have extremely high precision and reliability, enabling it to meet the requirements of high-quality connection between sheet metal parts under complex structures and strict performance requirements of the floor sweeper, and laying a solid foundation for the stability of the overall structure of the floor sweeper and the normal realization of various functions. Due to the characteristics of thin walls, low stiffness and high thermal conductivity of the sheet metal parts of the floor sweeper, the heat capacity is small. During the welding process, the welding heat is easily conducted and concentrated quickly, thus causing deformation or dislocation of the thin-walled sheet metal parts. Once such deformation and dislocation problems occur, it will greatly affect the subsequent assembly accuracy of the floor sweeper, making the components unable to fit accurately, and may then lead to a series of problems such as decreased sealing performance, unstable structure, and increased component wear during the operation of the floor sweeper, seriously affecting the overall performance and service life of the floor sweeper. Summary of the Invention

[0003] Technical Problems to be Solved Aiming at the above-mentioned disadvantages of the prior art, the present invention provides a welding device for local precision connection of sheet metal parts of a floor sweeper, which can effectively solve the problem of easy deformation of local welding of sheet metal parts in the prior art.

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: The present invention provides a welding device for local precision connection of sheet metal parts of a floor sweeper, including: A welding machine, and a positioning part for positioning a plurality of sheet metal parts to be welded is arranged at the bottom end of the welding machine; The positioning part includes an upper fixture and a lower fixture. The lower fixture includes a positioning plate, a rotating part is arranged at the bottom end of the positioning plate, and an inner support part is arranged in the middle of the top end of the positioning plate. The upper fixture includes a positioning frame that is snap-fitted to the outer wall of the positioning plate, and an outer pressing part is arranged at the upper section of the inner wall of the positioning frame. The outer pressing part and the inner support part cooperate to position the sheet metal parts; Among them, the inner support part includes a resisting plate that fits against the side of the sheet metal part, and a rubber block is rotatably connected to the inner wall of the resisting plate.

[0005] Furthermore, a plurality of convex blocks are arranged on the inner wall of the positioning plate, and elastic sheets are elastically connected to the bottom ends of the convex blocks.

[0006] Further, the inner support member further includes a fixing frame located in the middle of the top end of the positioning plate. A controller is provided in the middle of the fixing frame. The controller is electrically connected to the telescopic rods symmetrically arranged inside the fixing frame. The other end of the telescopic rod is fixedly connected to the middle of the pressing plate.

[0007] Further, the outer wall of the pressing plate is equidistantly provided with limiting grooves. Rubber blocks are rotatably connected to the inner walls of the limiting grooves. A scraper group is provided on the outer wall of the limiting grooves.

[0008] Further, the bottom end of the rubber block is designed in an arc shape. When the rubber block approaches the sheet metal part, it exerts a stable and uniform downward pressure on the convex block.

[0009] Further, the rubber block is designed in a spherical shape.

[0010] Further, the top end of the convex block is designed in a circular arc shape, and a rubber layer is provided at the part where the convex block is higher than the surface of the positioning plate in the initial state.

[0011] The technical solution provided by the present invention has the following beneficial effects compared with the prior art: The present invention is provided with an inner support member and an outer pressing member. After the sheet metal part is placed on the surface of the positioning plate for preliminary fixation, the controller controls the telescopic rod to extend. The telescopic rod drives the pressing plate to move until the pressing plate contacts the side of the sheet metal part. The inner support member provides a supporting force from the inside, and the outer pressing member applies a pressure from the outside. The two cooperate with each other to effectively prevent the sheet metal part from deforming due to uneven stress.

[0012] The present invention is provided with a rotating member. The rotating member drives the positioning plate to rotate at multiple angles. The positioning plate drives the sheet metal part evenly limited under the combined action of the inner support member and the outer pressing member to move synchronously. During the welding process, the welding part can be accurately placed within the working range of the welding machine.

[0013] The present invention is provided with a pressing plate. The bottom end of the pressing plate is designed in an arc shape. During the extension process of the inner support member, the arc-shaped side can achieve smooth and accurate contact with the convex block in the positioning plate. Due to the unique geometric shape of the arc, it can automatically adjust the contact angle and pressure distribution according to the specific position and shape of the convex block, ensuring a stable and uniform downward pressure on the convex block. This uniform pressure distribution avoids local stress concentration, enabling the rubber layer on the surface of the convex block and the elastic sheet at its bottom end to undergo elastic deformation within a reasonable stress range, effectively storing elastic potential energy. Compared with the traditional planar design, the arc-shaped side can better fit the surface of the convex block, greatly improving the efficiency of pressure transmission and providing a solid energy reserve foundation for subsequent cleaning actions.

[0014] The present invention is provided with rubber blocks, which are designed in a spherical shape and always maintain good contact with the inner wall of the sheet metal part to ensure the limiting effect. The contact points of multiple spherical rubber blocks with the inner wall of the sheet metal part are more dispersed, which can effectively reduce the stress concentration phenomenon. The rotation of the rubber blocks can reduce the friction between the rubber blocks and the inner wall of the sheet metal part and reduce the wear degree. The rotation of the spherical rubber blocks enables all parts of its surface to come into contact with the scraper group in turn, ensuring comprehensive cleaning coverage. The scraping action of the scraper group directly destroys the bonding force between the welding slag and the surface of the rubber ball and peels off the welding slag from the surface of the rubber ball.

[0015] The present invention is provided with bumps. When the inner support member contracts, the restriction of the abutting plate on the bumps is released, and the elastic piece at the bottom end of the bumps quickly recovers its elastic deformation. At this time, the elastic force generated by the elastic piece acts on the abutting plate in an efficient and precise manner. This elastic force causes the vibration of the abutting plate, and the vibration makes the welding slag attached to the surface of the abutting plate and the outer wall of the inner support member loosen due to the continuous inertial force. Especially for those small powdery welding slags that are difficult to remove by conventional methods, the high-frequency vibration can effectively break their adhesion to the surface and make them fall off from the surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present invention; Figure 2 It is a schematic diagram of the split structure of the positioning part of the embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of the upper fixture of the embodiment of the present invention; Figure 4 It is a schematic diagram of the lower fixture of the embodiment of the present invention; Figure 5 For the embodiment of the present invention Figure 4 The enlarged schematic diagram at position A; Figure 6 It is a schematic diagram of the telescopic change of the support member of the embodiment of the present invention; Figure 7 It is a schematic diagram of the split structure of the support member of the embodiment of the present invention.

[0018] The reference numerals in the figure respectively represent: 1, welding machine; 2, positioning part; 21, upper fixture; 211, positioning frame; 212, external pressing part; 22, lower fixture; 221, positioning plate; 222, convex block; 223, elastic piece; 225, inner support part; 2251, fixed frame; 2252, controller; 2253, telescopic rod; 2255, abutting plate; 2256, rubber block; 2257, limiting groove; 2258, scraping plate group; 23, rotating part. Detailed implementation manners

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] The present invention will be further described below with reference to the embodiments.

[0021] Embodiment: Please refer to Figures 1 - 7 , the present invention provides a technical solution for a welding device for local precision connection of a sheet metal part of a floor sweeper: Referring to Figure 1 , the welding device includes a welding machine 1 for welding the sheet metal, and a positioning part 2 for positioning a plurality of sheet metal parts to be welded is arranged at the bottom end of the welding machine 1.

[0022] When locally welding the sheet metal parts, the resistance spot welding method is usually adopted. However, the positioning in the prior art usually adopts the combination of positioning pins and fixed clamping jaws to position the process holes arranged on the sheet metal parts, which is applicable to flat or simple bent parts, cannot adapt to curved or special-shaped sheet metal parts, and will prevent the welding torch from entering the concave area. When switching between multiple varieties, it is necessary to stop the machine and manually adjust. The rigid pressing causes local plastic deformation of the thin-walled parts. In view of this, the present invention adopts the design of the positioning part 2.

[0023] Referring to Figure 2 , Figure 4 and Figure 5 , the positioning part 2 of the present invention includes an upper fixture 21 and a lower fixture 22. The lower fixture 22 includes a positioning plate 221. A plurality of convex blocks 222 are arranged on the inner wall of the positioning plate 221. The bottom ends of the convex blocks 222 are elastically connected with elastic pieces 223. The top ends of the convex blocks 222 are designed in a circular arc shape, and a rubber layer is arranged at the part where the convex blocks 222 are higher than the surface of the positioning plate 221 in the initial state. The plurality of convex blocks 222 can perform primary limiting on sheet metal parts with different shapes and sizes placed on the positioning plate 221.

[0024] Referring toFigure 2 and Figure 3 At the bottom end of the positioning plate 221, a rotating member 23 is provided. The rotating member 23 includes... The rotating member 23 drives the positioning plate 221 to rotate at multiple angles. The positioning plate 221 drives the sheet metal part that is uniformly limited under the combined action of the inner support member 225 and the outer pressing member 212 to move synchronously. During the welding process, the welding part can be accurately placed within the working range of the welding machine 1. At the same time, when performing multi-pass welds, the welding position can be quickly switched by rotating the positioning plate 221, improving production efficiency. For some sheet metal parts with complex shapes, such as parts with curved, inclined, or irregular shapes, by adjusting the angle of the positioning plate 221, the inner support member 225 and the outer pressing member 212 can better fit the inner and outer walls of the sheet metal part, achieving more accurate positioning, which helps to improve the processing accuracy and quality of sheet metal parts with complex shapes. The rotatable positioning plate 221 also provides greater operating space and flexibility for the operator. When installing and disassembling the sheet metal part, the sheet metal part can be adjusted to a more convenient operating position by rotating the positioning plate 221, reducing the operation difficulty and labor intensity.

[0025] Reference Figure 6 、 Figure 3 and Figure 4 The upper fixture 21 includes a positioning frame 211. The lower part of the inner wall of the positioning frame 211 is engaged with the outer wall of the positioning plate 221. An outer pressing member 212 is provided at the upper part of the inner wall of the positioning frame 211. In the middle of the top end of the positioning plate 221, an inner support member 225 is provided. The inner support member 225 includes a fixed frame 2251 located in the middle of the top end of the positioning plate 221. A controller 2252 is provided in the middle of the fixed frame 2251. The controller 2252 is electrically connected to the telescopic rods 2253 symmetrically arranged inside the fixed frame 2251. The other end of the telescopic rod 2253 is provided with a pressing plate 2255.

[0026] The extension principle and structure of the inner support member 225 are the same as those of the outer pressing member 212. After the sheet metal part is initially fixed on the surface of the positioning plate 221, the controller 2252 controls the telescopic rod 2253 to extend. The telescopic rod 2253 drives the pressing plate 2255 to move until the pressing plate 2255 contacts the side of the sheet metal part. The inner support member 225 provides a supporting force from the inside, and the outer pressing member 212 applies a pressure from the outside. The two cooperate with each other to effectively prevent the sheet metal part from deforming due to uneven stress.

[0027] The bottom end of the abutting plate 2255 is set to be arc-shaped. During the process of the inner support member 225 extending and contacting the inner wall of the sheet metal part, the abutting plate 2255 gradually approaches the convex block 222 on the inner wall of the positioning plate 221 and squeezes the convex block 222 at a relatively slow speed. During this process, the elastic sheet 223 at the bottom end of the convex block 222 undergoes elastic deformation due to the external force, converting mechanical energy into elastic potential energy and storing it. Since the top end of the convex block 222 is semi-circular, it can provide a stable and uniform reaction force when being squeezed, ensuring the smooth movement of the inner support member 225 during the extension process and maintaining good contact with the inner wall of the sheet metal part to be welded, providing precise positioning for the subsequent welding operation. The elastic deformation ability of the rubber layer on the surface of the convex block 222 enables it to adapt to the dimensional tolerance of the inner wall of the sheet metal part, thus ensuring the consistency of the positioning accuracy of workpieces in different batches; During the extension process of the inner support member 225, the arc-shaped side can achieve smooth and precise contact with the convex block 222 in the positioning plate 221. Due to the unique geometric shape of the arc, it can automatically adjust the contact angle and pressure distribution according to the specific position and shape of the convex block 222, ensuring a stable and uniform downward pressure on the convex block 222. This uniform pressure distribution avoids local stress concentration, enabling the rubber layer on the surface of the convex block 222 and the elastic sheet 223 at its bottom end to undergo elastic deformation within a reasonable stress range and effectively store elastic potential energy. Compared with the traditional planar design, the arc-shaped side can better fit the surface of the convex block 222, greatly improving the efficiency of pressure transmission and providing a solid energy storage basis for the subsequent cleaning action.

[0028] Reference Figure 6 and Figure 7 As shown in the figure, multiple limiting grooves 2257 are provided on the outer wall of the abutting plate 2255. Rubber blocks 2256 are rotatably connected to the inner walls of the limiting grooves 2257. The rubber blocks 2256 are designed in a spherical shape, and a scraper group 2258 is provided on the outer wall of the limiting grooves 2257.

[0029] When the inner support member 225 contracts, the restriction of the abutment plate 2255 on the bump 222 is released. The elastic piece 223 at the bottom end of the bump 222 quickly recovers its elastic deformation. At this time, the elastic force generated by the elastic piece 223 acts on the abutment plate 2255 in an efficient and precise manner. This elastic force causes the vibration of the abutment plate 2255, and the vibration makes the welding slag attached to the surface of the abutment plate 2255 and the outer wall of the inner support member 225 loosen due to the continuous inertial force. Especially for those small powdery welding slags that are difficult to remove by conventional methods, the high-frequency vibration can effectively break their adhesion to the surface and make them fall off the surface. This vibration-based cleaning method is not only efficient but also can cover all corners of the abutment plate 2255 and the outer wall of the inner support member 225, achieving a comprehensive and dead-angle-free cleaning effect. Even on complex curved surface structures, the welding slag can be shaken off under sufficient vibration, ensuring the consistency of the cleaning effect of sheet metal parts with different shapes and structures after welding and improving the stability of product quality.

[0030] Meanwhile, during the process of the bump 222 moving with the elastic deformation of the elastic piece 223, it can also exert a force on the spherical rubber block 2256, which prompts the spherical rubber block 2256 to start rotating. The surface of the rotating spherical rubber block 2256 is in close contact with the scraper group 2258. The scraper group 2258 mechanically scrapes the surface of the spherical rubber block 2256 with its precise angle and sharp cutting edge. In this process, the scraper group 2258 and the rotating spherical rubber block 2256 cooperate with each other to form an efficient cleaning mechanism. The rotation of the spherical rubber block 2256 enables all parts of its surface to come into contact with the scraper group 2258 in turn, ensuring comprehensive cleaning coverage. The scraping action of the scraper group 2258 directly breaks the bonding force between the welding slag and the surface of the rubber ball, peeling the welding slag off the surface of the rubber ball.

[0031] During the welding process, welding slag is likely to remain on the cutting edge of the scraper group 2258, such as the molten droplets formed by carbon steel spatter. These residual welding slags will affect the subsequent cleaning effect of the scraper group 2258 and even cause the blockage of the scraper group 2258. However, the vibration of the abutment plate 2255 can make the welding slag on the cutting edge of the scraper group 2258 fall into the collection tank, avoiding the blockage problem of the scraper group 2258, increasing the service life of the scraper group 2258, and greatly reducing the maintenance cost.

[0032] The vibration cleaning of the backing plate 2255 and the rotary cleaning of the spherical rubber blocks 2256 are not isolated processes, but rather cooperate and promote each other. The high-frequency vibration of the backing plate 2255 can not only remove the welding slag on its own surface and the outer wall of the inner support 225, but also, through vibration transmission, further break the adhesion of the welding slag to the surface of the spherical rubber blocks 2256, creating more favorable conditions for the rotary cleaning of the spherical rubber blocks 2256. The rotary cleaning of the spherical rubber blocks 2256, on the other hand, can shake off the welding slag that may remain on the scraper group 2258, prevent the scraper group 2258 from being blocked, ensure that the scraper group 2258 always maintains good scraping performance, and thus improve the vibration cleaning effect of the backing plate 2255. This synergistic effect makes the entire cleaning process more efficient, capable of effectively dealing with various types and sizes of welding slag, and significantly improving the quality and efficiency of cleaning.

[0033] The rubber blocks 2256 can better fit the inner wall through their own deformation, providing a more uniform supporting force. The rubber blocks 2256 can rotate flexibly within the limit slots 2257, always maintaining good contact with the inner wall of the sheet metal part to ensure the limiting effect. Whether the sheet metal part is arc-shaped, has corners, or other irregular shapes, it can play a stable role. During the welding process of the sheet metal part, various stresses and deformations may occur. The rotatably connected rubber blocks 2256 can freely rotate according to the deformation of the sheet metal part while the backing plate 2255 limits the inner wall of the sheet metal part, making the force between the backing plate 2255 and the sheet metal part more uniform, effectively buffering the welding stress, reducing the deformation or damage of the sheet metal part caused by local stress concentration, and improving the welding quality and precision of the sheet metal part.

[0034] Compared with planar fitting, the contact points of multiple spherical rubber blocks 2256 with the inner wall of the sheet metal part are more dispersed, which can effectively reduce the stress concentration phenomenon. This is particularly important for some thin-walled or easily deformed sheet metal parts, and can avoid the damage of the sheet metal part caused by excessive local stress. During the welding process, when the sheet metal part undergoes small displacements or vibrations, the rotation of the rubber blocks 2256 can reduce the friction with the inner wall of the sheet metal part, reduce the wear degree, help extend the service life of the rubber blocks 2256 and the backing plate 2255, and avoid the adverse effects of the heat generated by excessive friction on the sheet metal part and the welding quality.

[0035] Both the outer walls of the backing plate 2255 and the rubber blocks 2256 are provided with rubber layers. The rubber layers have good elasticity and buffering performance, and can play a role in buffering and shock absorption when contacting the inner wall of the sheet metal part, reducing the impact force between the inner support 225 and the sheet metal part, reducing the noise and vibration generated by collisions, protecting the surface of the sheet metal part from damage. The rubber layers can closely fit the inner wall of the sheet metal part, improve the support stability of the inner support 225, and prevent the sheet metal part from sliding during the positioning process.

[0036] The arc-shaped side design of the bottom plate 2255 and the elastic deformation recovery process of the bump 222 both have good self-adaptability and buffering performance. During multiple extension and contraction cycles of the inner support 225, this structure can effectively absorb and disperse stress, reducing wear and fatigue between components. At the same time, due to the improved cleaning effect, the erosion and damage of welding slag to components are reduced, extending the service life of each component. In addition, the cooperation between the components of this structure is tight and precise, enabling stable performance in complex working environments and ensuring the long-term reliable operation of the system.

[0037] The entire cleaning process is completely achieved by the extension and contraction movement of the inner support 225 and the elastic deformation of the bump 222, without the need for additional power sources such as motors and pneumatic devices. This not only reduces energy consumption, conforms to the development trend of energy conservation and environmental protection, but also reduces the complexity and failure points of the equipment. Compared with traditional cleaning methods, this structure can significantly reduce energy costs and improve energy utilization efficiency, bringing considerable economic benefits to enterprises.

[0038] Each component in the structure, such as the bottom plate 2255, the bump 222, and the rubber block 2256, adopts a modular design, which is convenient for disassembly and replacement. When a component is worn or damaged, it can be quickly replaced individually without large-scale maintenance of the entire equipment. This modular design greatly shortens the downtime of the equipment and improves production efficiency.

[0039] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and 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 welding device for local precision connection of sheet metal parts of a sweeping machine, characterized in that: include: A welding machine (1), wherein a positioning portion (2) for positioning a plurality of sheet metal parts to be welded is provided at the bottom end of the welding machine (1); The positioning part (2) comprises an upper clamp (21) and a lower clamp (22), the lower clamp (22) comprises a positioning plate (221), a rotating member (23) is arranged at the bottom end of the positioning plate (221), an inner support member (225) is arranged at the middle part of the top end of the positioning plate (221), the upper clamp (21) comprises a positioning frame (211) which is snap-fitted and connected to the outer wall of the positioning plate (221), an external pressure member (212) is arranged at the upper section of the inner wall of the positioning frame (211), and the external pressure member (212) and the inner support member (225) cooperate to position the sheet metal part; The inner support member (225) comprises a support plate (2255) fitted with a side edge of the sheet metal member, and a rubber block (2256) is rotatably connected to the inner wall of the support plate (2255).

2. The welding device for local precision connection of sheet metal parts of a sweeping machine according to claim 1, characterized in that: The inner wall of the positioning plate (221) is provided with a plurality of protrusions (222), and the bottom ends of the protrusions (222) are elastically connected to spring sheets (223).

3. The welding device for local precision connection of sheet metal parts of a sweeping machine according to claim 2, characterized in that: The inner support member (225) further comprises a fixed frame (2251) located in the middle of the top end of the positioning plate (221); a controller (2252) is arranged in the middle of the fixed frame (2251); the controller (2252) is electrically connected to a telescopic rod (2253) symmetrically arranged inside the fixed frame (2251); the other end of the telescopic rod (2253) is fixedly connected to the middle of the abutment plate (2255).

4. The welding device for local precision connection of sheet metal parts of a sweeping machine according to claim 3, characterized in that: The outer wall of the stop plate (2255) is provided with limit grooves (2257) at equal intervals, the inner wall of the limit groove (2257) is rotatably connected to the rubber block (2256), and the outer wall of the limit groove (2257) is provided with a scraper group (2258).

5. The welding device for local precision connection of sheet metal parts of a sweeping machine according to claim 4, characterized in that: The bottom end of the rubber block (2256) is designed to be arc-shaped, and when the rubber block (2256) is close to the sheet metal part, it applies a stable and uniform downward pressure to the protrusion (222).

6. A welding device for local precision connection of sheet metal parts of a sweeping machine according to claim 5, characterized in that: The rubber block (2256) is designed to be spherical.

7. The welding device for local precision connection of sheet metal parts of a sweeping machine according to claim 2, characterized in that: The top of the protrusion (222) is designed to be arc-shaped, and in the initial state, a rubber layer is provided at a portion of the protrusion (222) that is higher than the surface of the positioning plate (221).

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