A welding device for local precision connection of sheet metal parts of a sweeper

Abstract

The present invention relates to the field of welding technology, and discloses a welding device for local precision connection of sheet metal parts of a sweeper, comprising a welding part and a positioning part, the positioning part comprising an upper clamp and a lower clamp, the lower clamp comprising a positioning plate, a rotating part is provided at the bottom end of the positioning plate, an internal support part is provided at the middle part of the top end of the positioning plate, the upper clamp comprises a positioning frame that is engaged with the outer wall of the positioning plate, an external pressure part is provided at the upper section of the inner wall of the positioning frame, and the external pressure part and the internal support part cooperate to position the sheet metal part. The invention is provided with an internal support part and an external pressure part, after the sheet metal part is placed on the surface of the positioning plate for preliminary fixation, a controller controls the extension of the telescopic rod, and the telescopic rod drives the abutment plate to move until the abutment plate contacts the side of the sheet metal part, the internal support part provides support force from the inside, and the external pressure part applies pressure from the outside, and the two cooperate with each other to effectively prevent the sheet metal part from being deformed due to uneven force.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and in particular to a welding device for local precision connection of sheet metal parts of a sweeping machine. Background Art

[0002] By applying advanced welding technology, local welding operations are performed on various sheet metal parts of the sweeper to ensure that the connection parts have extremely high precision and reliability, so that it can meet the needs of high-quality connections between sheet metal parts under the complex structure and strict performance requirements of the sweeper, laying a solid foundation for the stability of the overall structure of the sweeper and the normal realization of various functions.

[0003] Because vacuum cleaner sheet metal components are generally thin-walled, low in rigidity, and have high thermal conductivity, resulting in a relatively small heat capacity, welding heat can easily conduct and accumulate during the welding process, causing deformation or misalignment of thin-walled sheet metal components. Once such deformation and misalignment occur, they can significantly impact the subsequent assembly accuracy of the vacuum cleaner, preventing accurate fit between components. This can lead to a series of problems during operation, such as reduced sealing, structural instability, and increased component wear, seriously impacting the overall performance and service life of the vacuum cleaner. Summary of the Invention

[0004] Technical problems solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a welding device for local precision connection of sheet metal parts of a sweeper, which can effectively solve the problem of easy deformation of local welding of sheet metal parts in the prior art.

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

[0007] The present invention provides a welding device for local precision connection of sheet metal parts of a sweeping machine, comprising:

[0008] A welding machine, wherein the bottom end of the welding machine is provided with a positioning portion for positioning a plurality of sheet metal parts to be welded;

[0009] The positioning portion includes an upper clamp and a lower clamp, the lower clamp includes a positioning plate, a rotating member is provided at the bottom end of the positioning plate, an internal support member is provided at the middle of the top end of the positioning plate, the upper clamp includes a positioning frame that is engaged with the outer wall of the positioning plate, an external pressure member is provided at the upper section of the inner wall of the positioning frame, and the external pressure member and the internal support member cooperate to position the sheet metal part;

[0010] Wherein, the inner support member includes an abutment plate that fits against the side of the sheet metal member, and the inner wall of the abutment plate is rotatably connected to a rubber block;

[0011] The outer wall of the abutment plate is provided with limiting grooves at equal intervals, the inner wall of the limiting groove is rotatably connected to the rubber block, and the outer wall of the limiting groove is provided with a scraper group;

[0012] The bottom end of the rubber block adopts an arc-shaped design.

[0013] Furthermore, a plurality of protrusions are provided on the inner wall of the positioning plate, and the bottom ends of the protrusions are elastically connected to springs.

[0014] Furthermore, the inner support member also includes a fixed frame located in the middle of the top of the positioning plate, and a controller is provided in the middle of the fixed frame. The controller is electrically connected to the telescopic rod symmetrically arranged inside the fixed frame, and the other end of the telescopic rod is fixedly connected to the middle of the support plate.

[0015] Furthermore, when the rubber block is close to the sheet metal part, it applies a stable and uniform downward pressure to the protrusion.

[0016] Furthermore, the rubber block is designed to be spherical.

[0017] Furthermore, the top of the protrusion is designed to be arc-shaped, and a rubber layer is provided at a portion of the protrusion that is higher than the surface of the positioning plate in an initial state.

[0018] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0019] The present invention is provided with an internal support member and an external pressure member. After the sheet metal is placed on the surface of the positioning plate and initially fixed, the controller controls the telescopic rod to extend, and the telescopic rod drives the anti-plate to move until the anti-plate contacts the side of the sheet metal. The internal support member provides support force from the inside, and the external pressure member applies pressure from the outside. The two cooperate with each other to effectively prevent the sheet metal from being deformed due to uneven force.

[0020] The present invention is provided with a rotating part, which drives the positioning plate to rotate at multiple angles. The positioning plate drives the sheet metal parts that are evenly limited under the joint action of the internal support parts and the external pressure parts to move synchronously. During the welding process, the welding part can be accurately placed within the working range of the welding machine.

[0021] The present invention is provided with a support plate, the bottom end of which adopts an arc-shaped design. During the extension process of the internal support member, the curved side can achieve smooth and precise contact with the bump 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 bump, ensuring that stable and uniform downward pressure is applied to the bump. This uniform pressure distribution avoids local stress concentration, allowing the rubber layer on the surface of the bump and the spring at the bottom end to undergo elastic deformation within a reasonable stress range, effectively storing elastic potential energy. Compared with traditional flat designs, the curved side can better fit the surface of the bump, greatly improving the efficiency of pressure transmission and providing a solid energy storage foundation for subsequent cleaning actions.

[0022] The present invention includes a spherical rubber block that consistently maintains good contact with the inner wall of the sheet metal component, ensuring a precise positioning effect. The contact points between the multiple spherical rubber blocks and the inner wall of the sheet metal component are more dispersed, effectively reducing stress concentration. The rotation of the rubber block reduces friction with the inner wall of the sheet metal component, reducing wear. The rotation of the spherical rubber block allows each portion of its surface to sequentially contact the scraper assembly, ensuring comprehensive cleaning coverage. The scraping action of the scraper assembly directly destroys the bonding force between the welding slag and the surface of the rubber ball, stripping the welding slag from the rubber ball surface.

[0023] The present invention is provided with a protrusion. When the inner support part contracts, the restriction of the protrusion by the anti-plate is released, and the spring piece at the bottom end of the protrusion quickly restores its elastic deformation. At this time, the elastic force generated by the spring piece acts on the anti-plate in an efficient and precise manner. This elastic force causes the anti-plate to vibrate. The vibration causes the welding slag attached to the surface of the anti-plate and the outer wall of the inner support part to loosen due to the continuous inertial force. In particular, for those tiny powdered welding slags that are difficult to remove by conventional means, high-frequency vibration can effectively destroy their adhesion to the surface, causing them to fall off the surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0025] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the positioning portion structure of an embodiment of the present invention;

[0027] Figure 3 Schematic diagram of the upper clamp structure according to an embodiment of the present invention;

[0028] Figure 4 Schematic diagram of the lower clamp according to an embodiment of the present invention;

[0029] Figure 5 For the embodiment of the present invention Figure 4 A in the middle is an enlarged structural diagram;

[0030] Figure 6 This is a schematic diagram of the expansion and contraction of a support member according to an embodiment of the present invention;

[0031] Figure 7Schematic diagram of the split structure of the support member according to an embodiment of the present invention.

[0032] The numbers in the figure represent: 1. welding machine; 2. positioning part; 21. upper clamp; 211. positioning frame; 212. external pressure piece; 22. lower clamp; 221. positioning plate; 222. protrusion; 223. spring; 225. inner support; 2251. fixing frame; 2252. controller; 2253. telescopic rod; 2255. abutment plate; 2256. rubber block; 2257. limiting groove; 2258. scraper group; 23. rotating part. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] The present invention will be further described below with reference to the embodiments.

[0035] Example:

[0036] See also Figure 1-Figure 7 The present invention provides a technical solution for a welding device for local precision connection of sheet metal parts of a sweeping machine:

[0037] refer to Figure 1 The welding device includes a welding machine 1 for welding sheet metal, and a positioning part 2 for positioning multiple sheet metal parts to be welded is provided at the bottom end of the welding machine 1.

[0038] Resistance spot welding is usually used for local welding of sheet metal parts. However, the positioning technology of the prior art usually adopts a combination of positioning pins and fixed clamps to position the process holes set on the sheet metal parts. It is suitable for flat or simple bent parts, but cannot adapt to curved or special-shaped sheet metal parts, and will hinder the welding gun from entering the concave area. Switching between multiple varieties requires stopping the machine for manual adjustment, and rigid pressing causes local plastic deformation of thin-walled parts. In view of this, the present invention adopts the positioning part 2 design.

[0039] refer to Figure 2 、 Figure 4 and Figure 5The positioning part 2 of the present invention includes an upper clamp 21 and a lower clamp 22. The lower clamp 22 includes a positioning plate 221. The inner wall of the positioning plate 221 is provided with multiple protrusions 222. The bottom end of the protrusion 222 is elastically connected with a spring piece 223. The top of the protrusion 222 adopts an arc-shaped design, and in the initial state, the part where the protrusion 222 is higher than the surface of the positioning plate 221 is provided with a rubber layer. The multiple protrusions 222 can perform primary limiting on sheet metal parts of different shapes and sizes placed on the positioning plate 221.

[0040] refer to Figure 2 and Figure 3 , a rotating part 23 is provided at the bottom end of the positioning plate 221, and the rotating part 23 includes, the rotating part 23 drives the positioning plate 221 to rotate at multiple angles, and the positioning plate 221 drives the sheet metal parts that are uniformly limited under the joint action of the inner support part 225 and the external pressure part 212 to move synchronously, so that the welding part can be accurately placed within the working range of the welding machine 1 during the welding process; at the same time, when performing multi-pass welding, the welding position can be quickly switched by rotating the positioning plate 221, thereby 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 part 225 and the external pressure part 212 can be better fitted with the inner and outer walls of the sheet metal parts, 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 the operator with greater operating space and flexibility. When installing and disassembling sheet metal parts, the sheet metal parts can be adjusted to a position that is more convenient for operation by rotating the positioning plate 221, thereby reducing the difficulty of operation and labor intensity.

[0041] refer to Figure 6 、 Figure 3 and Figure 4 The upper clamp 21 includes a positioning frame 211, the lower section of the inner wall of the positioning frame 211 is engaged with the outer wall of the positioning plate 221, an external pressure piece 212 is provided at the upper section of the inner wall of the positioning frame 211, an internal support piece 225 is provided at the middle of the top of the positioning plate 221, the internal support piece 225 includes a fixed frame 2251 located in the middle of the top 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 rod 2253 symmetrically arranged inside the fixed frame 2251, and the other end of the telescopic rod 2253 is provided with a support plate 2255.

[0042] The extension principle and structure of the internal support member 225 are the same as the extension principle and structure of the external pressure member 212. After the sheet metal is placed on the surface of the positioning plate 221 and initially fixed, the controller 2252 controls the telescopic rod 2253 to extend, and the telescopic rod 2253 drives the support plate 2255 to move until the support plate 2255 contacts the side of the sheet metal. The internal support member 225 provides support force from the inside, and the external pressure member 212 applies pressure from the outside. The two cooperate with each other to effectively prevent the sheet metal from being deformed due to uneven force.

[0043] The bottom end of the support plate 2255 is set to an arc shape. During the process of the inner support member 225 extending to contact the inner wall of the sheet metal, the support plate 2255 gradually approaches the protrusion 222 on the inner wall of the positioning plate 221 and squeezes the protrusion 222 at a relatively slow speed. During this process, the spring piece 223 at the bottom end of the protrusion 222 undergoes elastic deformation due to the action of external force, converting mechanical energy into elastic potential energy and storing it. Since the top of the protrusion 222 is semicircular, it can provide a stable and uniform reaction force when squeezed, ensuring the smooth movement of the inner support member 225 during the extension process, while also maintaining good contact with the inner wall of the sheet metal to be welded, providing precise positioning for subsequent welding operations. The elastic deformation ability of the rubber layer on the surface of the protrusion 222 enables it to adapt to the dimensional tolerance of the inner wall of the sheet metal, thereby ensuring the consistency of the positioning accuracy of different batches of workpieces;

[0044] During the extension of the inner support member 225, the curved side can achieve smooth and precise contact with the bump 222 within 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 bump 222, ensuring that the bump 222 is applied with stable and uniform downward pressure. This uniform pressure distribution avoids local stress concentration, allowing the rubber layer on the surface of the bump 222 and the spring 223 at its bottom to undergo elastic deformation within a reasonable stress range, effectively storing elastic potential energy. Compared with traditional flat designs, the curved side can better conform to the surface of the bump 222, greatly improving the efficiency of pressure transmission and providing a solid energy reserve foundation for subsequent cleaning operations.

[0045] refer to Figure 6 and Figure 7 The outer wall of the stop plate 2255 is provided with a plurality of limiting grooves 2257 , the inner wall of the limiting groove 2257 is rotatably connected to the rubber block 2256 , the rubber block 2256 adopts a spherical design, and the outer wall of the limiting groove 2257 is provided with a scraper group 2258 .

[0046] When the inner support 225 contracts, the restraint on the bump 222 by the plate 2255 is released, and the spring 223 at the bottom of the bump 222 quickly recovers its elastic deformation. At this time, the elastic force generated by the spring 223 acts on the plate 2255 in an efficient and precise manner. This elastic force causes the plate 2255 to vibrate, causing the welding slag attached to the surface of the plate 2255 and the outer wall of the inner support 225 to loosen due to the continuous inertial force. Especially for those tiny powdered welding slag that are difficult to remove by conventional methods, the high-frequency vibration can effectively destroy their adhesion to the surface, causing them to fall off. This vibration-based cleaning method is not only efficient, but also covers every corner of the plate 2255 and the outer wall of the inner support 225, achieving a comprehensive and complete cleaning effect. Even on complex curved surfaces, the welding slag can be shaken off by sufficient vibration, ensuring the consistency of the cleaning effect after welding for sheet metal parts of different shapes and structures, and improving the stability of product quality.

[0047] At the same time, as the bump 222 elastically deforms and moves with the shrapnel 223, it can also exert a force on the spherical rubber block 2256. This force causes the spherical rubber block 2256 to start rotating. The surface of the rotating spherical rubber block 2256 is in close contact with the scraper assembly 2258. The scraper assembly 2258, with its precise angle and sharp edge, mechanically scrapes the surface of the spherical rubber block 2256. In this process, the scraper assembly 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 allows each part of its surface to contact the scraper assembly 2258 in turn, ensuring comprehensive cleaning coverage. The scraping action of the scraper assembly 2258 directly destroys 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.

[0048] During the welding process, welding slag easily remains on the cutting edge of the scraper assembly 2258, such as molten droplets formed by carbon steel splashes. This residual welding slag can affect the subsequent cleaning effect of the scraper assembly 2258 and even cause the scraper assembly 2258 to clog. The vibration of the abutment plate 2255 can cause the welding slag on the cutting edge of the scraper assembly 2258 to fall off into the collection tank, thus avoiding the problem of clogging the scraper assembly 2258, extending the service life of the scraper assembly 2258, and significantly reducing maintenance costs.

[0049] The vibration cleaning of the abutment plate 2255 and the rotational cleaning of the spherical rubber block 2256 are not isolated processes, but rather synergistic and mutually reinforcing. The high-frequency vibration of the abutment plate 2255 not only removes welding slag from its own surface and the outer wall of the inner support member 225, but also, through vibration transmission, further destroys the adhesion between the welding slag and the surface of the spherical rubber block 2256, creating more favorable conditions for the rotational cleaning of the spherical rubber block 2256. The rotational cleaning of the spherical rubber block 2256 shakes off any welding slag that may remain on the scraper assembly 2258, preventing clogging of the scraper assembly 2258 and ensuring that the scraper assembly 2258 maintains good scraping performance, thereby enhancing the vibration cleaning effect of the abutment plate 2255. This synergistic effect makes the entire cleaning process more efficient, effectively dealing with welding slag of various types and sizes, and significantly improving the quality and efficiency of cleaning.

[0050] The rubber block 2256 can better fit the inner wall through its own deformation, providing more uniform supporting force. The rubber block 2256 can flexibly rotate in the limiting groove 2257, always maintaining good contact with the inner wall of the sheet metal to ensure the limiting effect. Regardless of whether the sheet metal is arc-shaped, corner-shaped or other irregular shapes, it can play a stabilizing role; during the welding process of sheet metal parts, stresses and deformations in various directions may be generated. The rotatably connected rubber block 2256 can limit the inner wall of the sheet metal part with the support plate 2255, and at the same time, it can rotate freely according to the deformation of the sheet metal part, so that the force between the support plate 2255 and the sheet metal part is 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 accuracy of the sheet metal parts.

[0051] Compared with flat fitting, the contact points between the multiple spherical rubber blocks 2256 and the inner wall of the sheet metal are more dispersed, which can effectively reduce stress concentration. This is especially important for some thin-walled or easily deformed sheet metal parts, and can avoid damage to the sheet metal parts due to excessive local stress. During the welding process, when the sheet metal part undergoes slight displacement or vibration, the rotation of the rubber block 2256 can reduce the friction between the rubber block 2256 and the inner wall of the sheet metal part, reduce the degree of wear, and help extend the service life of the rubber block 2256 and the abutment plate 2255, and avoid the heat generated by excessive friction from having adverse effects on the sheet metal parts and welding quality.

[0052] The outer walls of the support plate 2255 and the rubber block 2256 are both provided with a rubber layer. The rubber layer has good elasticity and cushioning properties, and can play a role in buffering and shock absorption when contacting the inner wall of the sheet metal, reducing the impact force between the inner support member 225 and the sheet metal, reducing the noise and vibration caused by the collision, and protecting the surface of the sheet metal from damage. The rubber layer can fit tightly to the inner wall of the sheet metal, improve the supporting stability of the inner support member 225, and prevent the sheet metal from sliding during the positioning process.

[0053] The curved side design of the abutment plate 2255 and the elastic deformation recovery process of the protrusion 222 both provide excellent adaptability and cushioning properties. This structure effectively absorbs and disperses stress during the repeated expansion and contraction cycles of the internal support member 225, reducing wear and fatigue between components. Furthermore, the improved cleaning effect reduces erosion and damage to components by welding slag, extending the service life of each component. Furthermore, the tight and precise fit between the various components of this structure maintains stable performance even in complex operating environments, ensuring the long-term and reliable operation of the system.

[0054] The entire cleaning process relies entirely on the expansion and contraction of the internal support member 225 and the elastic deformation of the protrusion 222, eliminating the need for additional power sources such as motors or pneumatic devices. This not only reduces energy consumption, aligning with the trend of energy conservation and environmental protection, but also reduces equipment complexity and potential failure points. Compared to traditional cleaning methods, this structure significantly reduces energy costs and improves energy efficiency, bringing significant economic benefits to businesses.

[0055] Each component of the structure, such as the abutment plate 2255, the bump 222, and the rubber block 2256, is modular in design, making it easy to disassemble and replace. If a component becomes worn or damaged, it can be quickly replaced individually, eliminating the need for extensive repairs to the entire device. This modular design significantly reduces equipment downtime and improves production efficiency.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various 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 portion (2) includes an upper clamp (21) and a lower clamp (22), the lower clamp (22) includes a positioning plate (221), a rotating member (23) is provided at the bottom end of the positioning plate (221), an inner support member (225) is provided at the middle of the top end of the positioning plate (221), the upper clamp (21) includes a positioning frame (211) that is engaged with the outer wall of the positioning plate (221), an external pressure member (212) is provided 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); The outer wall of the abutment plate (2255) is provided with limiting grooves (2257) at equal intervals, the inner wall of the limiting groove (2257) is rotatably connected to the rubber block (2256), and the outer wall of the limiting groove (2257) is provided with a scraper group (2258); The bottom end of the rubber block (2256) is designed to be arc-shaped, and the rubber block (2256) is designed to be spherical; 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 pieces (223); 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) being provided in the middle of the fixed frame (2251), the controller (2252) being electrically connected to a telescopic rod (2253) symmetrically arranged inside the fixed frame (2251), and the other end of the telescopic rod (2253) being fixedly connected to the middle of the abutment 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 rubber block (2256) applies a stable and uniform downward pressure to the protrusion (222) when it is close to the sheet metal part.

3. The welding device for local precision connection of sheet metal parts of a sweeping machine according to claim 1, 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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