Method for reinforcing a washing drum bellows, reinforcing structure and washing drum bellows
By using methods such as shaping, welding, and reinforcing ribs, the problem of fatigue failure of the corrugated pipe of the washing machine drum was solved, the structural strength and fatigue resistance were enhanced, the equipment life was extended, downtime and filter replacement were reduced, and production continuity was ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ASIA SYMBOL SHANDONG PULP & PAPER
- Filing Date
- 2026-05-21
- Publication Date
- 2026-07-24
Smart Images
Figure CN122442299A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of washing machine equipment, specifically relating to a method for reinforcing the corrugated pipe of a washing machine drum, a reinforcing structure, and the corrugated pipe of the drum. Background Technology
[0002] As a core piece of equipment in the pulp and paper industry, the pulp washer is mainly used for washing and concentrating pulp. The drum is a key component of the washer, and its surface is typically covered with a corrugated structure to increase the filtration area and guide pulp flow. In actual operation, the drum is subjected to complex conditions of high-speed rotation, media scouring, and pulp friction. Because the corrugated pipes are usually welded from thin steel plates, their structural strength is relatively weak, making them highly susceptible to fatigue failure under alternating stress.
[0003] The existing technology for dealing with the damage to the corrugated pipe of the pulp washing machine drum adopts the method of replacing the whole pipe. However, this method cannot solve the problems of production line downtime, output loss, and environmental hazards during the replacement of materials, and it is difficult to meet the needs of continuous, efficient and environmentally friendly pulp production. Summary of the Invention
[0004] To address at least one of the technical problems existing in the background art, this application provides a method for reinforcing the corrugated pipe of a washing machine drum. By combining shaping, welding, and installing reinforcing ribs, the method effectively solves the problems of easy breakage and warping of the corrugated pipe leading to machine shutdown, significantly enhances the structural strength and fatigue resistance of the drum, thereby greatly extending the service life of the equipment and ensuring the continuous and stable operation of the washing machine.
[0005] The technical solution adopted in this application is as follows: The first aspect of this application provides a method for reinforcing the corrugated pipe of a washing machine drum, including: a) Shaping step: Use mechanical shaping tools to press and correct the warped edge of the bellows, so that the warped edge is restored to flatness and fits into the drum body; b) Repair welding steps: The weld gap between the pressure bar and the corrugated pipe is repaired by manual electric arc welding to form a repair weld layer; c) Strengthening step: Install reinforcing ribs at the broken or unwelded parts of the bellows. One end of the reinforcing rib is fully welded to the drum body, and the other end is fully welded to the broken part of the bellows to form axial or circumferential support for the broken part.
[0006] According to the method for reinforcing the corrugated pipe of the washing machine drum provided in the first aspect of this application, through a three-step coordinated process of "shaping - welding repair - reinforcement", not only is the geometric accuracy of the corrugated pipe restored by mechanical shaping, eliminating the hidden danger of mesh wear caused by edge warping, but also, by introducing reinforcing ribs at the fracture or weld opening and using a full welding process to form a rigid connection with the drum body and the corrugated pipe, the stress state of the original weld is changed. The alternating stress that was originally borne solely by the strength of the thin-walled corrugated pipe itself is transformed into a composite support structure jointly borne by the reinforcing ribs and the drum body, thereby significantly improving the overall structural strength and fatigue resistance of the drum. It effectively solves the defects of insufficient weld strength and easy re-fracture after simple welding repair in the prior art, greatly extends the service life of the washing machine drum, reduces unplanned downtime caused by equipment failure, ensures production continuity, and also avoids frequent replacement of expensive filter screens.
[0007] According to one embodiment of this application, in the shaping step, the fit error between the corrugated pipe edge and the drum body and pressure strip is controlled to be between 0.3mm and 0.5mm.
[0008] According to one embodiment of this application, in the repair welding step, the welding current is controlled to be between 100A and 110A, and the welding voltage is between 22V and 23V. After the repair welding is completed, the thickness of the repair weld layer is consistent with the thickness of the pressure strip.
[0009] According to one embodiment of this application, after the welding repair step, the weld repair layer is ground with a grinding wheel so that the surface of the weld repair layer is flush with the surface of the corrugated pipe.
[0010] According to one embodiment of this application, the width of the reinforcing rib is 12mm to 15mm and the thickness is 4mm to 5mm.
[0011] According to one embodiment of this application, when the fracture length of the corrugated pipe is ≤50cm, a reinforcing rib is provided along the axial direction of the corrugated pipe, and the length of the reinforcing rib is consistent with the extension length of the fractured part of the corrugated pipe.
[0012] According to one embodiment of this application, when the fracture length of the corrugated pipe is greater than 50 cm, multiple reinforcing ribs are provided at intervals along the circumference of the corrugated pipe.
[0013] A second aspect of this application provides a reinforcement structure for the corrugated pipe of a washing machine drum, used to implement the reinforcement method for the corrugated pipe of a washing machine drum as described in any of the first aspects above, including: Drum body, bellows, pressure strip, weld repair layer and reinforcing ribs; The bellows is fixedly installed on the drum body, and the pressure strip is attached and fixed to the edge of the bellows; The reinforcing ribs are arranged along the axial or circumferential direction of the corrugated pipe and are fixedly connected to the drum body and the broken part of the corrugated pipe respectively by full welding process.
[0014] According to one embodiment of this application, the reinforcing rib is a steel plate.
[0015] The third aspect of this application provides a corrugated pipe for a washing machine drum, including the corrugated pipe reinforcement structure for a washing machine drum as described in any of the second aspects above. Attached Figure Description
[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic flowchart illustrating the method for reinforcing the corrugated pipe of a washing machine drum provided in an embodiment of this application. Detailed Implementation
[0017] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.
[0018] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.
[0019] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0020] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0021] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.
[0022] like Figure 1 As shown, the first aspect of this application provides a method for reinforcing the corrugated pipe of a washing machine drum, comprising: a) Shaping step: Use mechanical shaping tools to press and correct the warped edge of the bellows, so that the warped edge is restored to flatness and fits into the drum body; b) Repair welding steps: The weld gap between the pressure bar and the corrugated pipe is repaired by manual electric arc welding to form a repair weld layer; c) Strengthening steps: Install reinforcing ribs at the broken or unwelded parts of the bellows. One end of the reinforcing rib is fully welded to the drum body, and the other end is fully welded to the broken part of the bellows to form axial or circumferential support for the broken part.
[0023] Specifically, in the shaping step, mechanical shaping tools are used to physically press and correct the edges of the corrugated pipe that have warped due to stress deformation or welding defects. This process aims to eliminate the gap between the warped edges and the drum body, restoring them to a flat and tight fit, thereby preventing scratching or wear on the washing machine's filter screen during high-speed operation and providing a flat and well-fitting foundation for subsequent welding operations.
[0024] In the repair welding step, manual arc welding is used to specifically repair areas where there are open or incomplete welds between the pressure strip and the bellows. By selecting matching welding rods and precisely controlling welding parameters, a uniform and continuous repair weld layer is formed, firmly reconnecting the pressure strip and the bellows, restoring their sealing properties and basic structural strength, and preventing slurry or washing liquid from seeping into the interior and causing further corrosion or structural damage.
[0025] In the reinforcement process, specially designed reinforcing ribs are installed at severely fractured or extensively welded areas on the bellows. One end of the reinforcing rib is fully welded to the drum body, while the other end is tightly fitted and fully welded to the fracture site of the bellows, forming an axial or circumferential rigid support. This measure greatly distributes the alternating stress and centrifugal force borne by the bellows, effectively preventing further propagation of the fracture and significantly improving the overall structural stability and fatigue life of the drum.
[0026] According to the method for reinforcing the corrugated pipe of the washing machine drum provided in the first aspect of this application, through a three-step coordinated process of "shaping - welding repair - reinforcement", not only is the geometric accuracy of the corrugated pipe restored by mechanical shaping, eliminating the hidden danger of mesh wear caused by edge warping, but also, by introducing reinforcing ribs at the fracture or weld opening and using a full welding process to form a rigid connection with the drum body and the corrugated pipe, the stress state of the original weld is changed. The alternating stress that was originally borne solely by the strength of the thin-walled corrugated pipe itself is transformed into a composite support structure jointly borne by the reinforcing ribs and the drum body, thereby significantly improving the overall structural strength and fatigue resistance of the drum. It effectively solves the defects of insufficient weld strength and easy re-fracture after simple welding repair in the prior art, greatly extends the service life of the washing machine drum, reduces unplanned downtime caused by equipment failure, ensures production continuity, and also avoids frequent replacement of expensive filter screens.
[0027] In some embodiments of this application, during the shaping step, the fit error between the corrugated pipe edge and the drum body and pressure strip is controlled to be between 0.3 mm and 0.5 mm.
[0028] By strictly limiting the fit error to within the range of 0.3mm to 0.5mm, a tight and uniform contact can be effectively ensured between the corrugated pipe edge and the drum body and pressure strip. This precision requirement is not arbitrarily set, but is based on the characteristics of the high-speed operation of the pulp washing machine: if the fit error is too large, the warped edge of the corrugated pipe will generate high-frequency vibration under the action of centrifugal force, which will not only aggravate the stress concentration at the weld, causing premature cracking of the repair weld layer, but may also directly scratch the filter screen of the pulp washing machine, causing serious consequences such as filter screen damage and pulp leakage; while controlling the error between 0.3mm and 0.5mm can ensure that the edge of the shaped corrugated pipe achieves "zero gap" fit with the drum body and pressure strip, providing a flat welding base for subsequent repair welding, and can also avoid local deformation or stress concentration of the corrugated pipe due to excessive pressing, thus achieving a balance between repair efficiency and structural reliability.
[0029] For example, the bellows of a rotating drum developed multiple warping edges due to long-term operation, with the maximum warping height reaching 2mm, far exceeding the allowable fit error range. First, a specialized mechanical shaping tool (such as a hydraulic pressing device with a pressure sensor) was used to press and correct the warped areas point by point. After each press, a feeler gauge was used to measure the gap between the warped edge and the drum body and pressure strip. Through multiple fine adjustments to the pressing position and pressure, the fit error of each part was finally controlled to approximately 0.4mm. After shaping, not only were the edges of the bellows completely fitted with the drum body and pressure strip without any visible gaps, but in subsequent welding and reinforcement steps, no defects such as porosity or slag inclusions caused by poor fit appeared in the welds. Furthermore, no filter screen scratches occurred after the equipment was put into operation, effectively extending the service life of the rotating drum.
[0030] In some embodiments of this application, during the repair welding step, the welding current is controlled to be between 100A and 110A, and the welding voltage is controlled to be between 22V and 23V. After the repair welding is completed, the thickness of the repair weld layer is consistent with the thickness of the pressure strip.
[0031] In the repair welding process, selecting low-carbon steel welding rods and precisely controlling welding parameters are crucial for ensuring the strength and appearance quality of the repaired area. Using a welding current of 100A to 110A and a welding voltage of 22V to 23V ensures stable arc combustion while preventing the corrugated pipe's thin wall from burning through due to excessive current, or defects such as incomplete fusion and slag inclusions due to insufficient current. Maintaining the same weld thickness as the pressure strip ensures both structural strength and operational safety: firstly, a uniform weld thickness effectively transfers the pressure strip's clamping force on the corrugated pipe, preventing stress concentration due to thickness differences during operation; secondly, a smooth weld surface prevents scratching the washing machine screen, extending its service life.
[0032] For example, with a pressure strip thickness of 4mm, maintenance personnel selected a 3.2mm diameter low-carbon steel welding rod and set the current to 105A and the voltage to 22.5V for repair welding. During the welding process, short arc operation (arc length controlled at around 3mm) and uniform rod movement were used to ensure the uniform spread of the molten pool. After the repair welding was completed, the thickness of the repair layer was measured with a weld inspection ruler. It was found that the thickness in some areas was 3.8mm, slightly lower than the thickness of the pressure strip. A second repair welding was then performed and the area was ground to make the thickness of the repair layer completely consistent with that of the pressure strip. Penetrant testing showed no defects such as cracks or porosity in the weld, and no weld cracking or mesh scratches occurred after the equipment was put into operation.
[0033] In some embodiments of this application, after the welding repair step, the weld repair layer is polished with a grinding wheel to make the surface of the weld repair layer flush with the surface of the corrugated pipe.
[0034] After the welding repair is completed, the weld repair layer is finely ground with a grinding wheel. This is a crucial step in achieving a smooth transition and restoring function at the repaired area. The core of this operation lies in using mechanical grinding to remove weld excess, slag, and surface unevenness defects generated during the welding process. This ensures that the surface of the weld repair layer is completely flush with the surface of the corrugated pipe substrate, while simultaneously ensuring that the surface roughness after grinding is controlled within a reasonable range (typically Ra≤12.5μm). During grinding, a low-speed grinding wheel (speed controlled below 3000r / min) should be used with even force to avoid over-grinding, which could lead to thinning of the corrugated pipe wall or localized depressions. Simultaneously, insufficient grinding must be avoided to prevent the formation of raised burrs, which could affect the operation of subsequent equipment.
[0035] First, the flush weld surface completely eliminates the potential risk of scratching the filter screen in the pulp washing machine. When the machine is running at high speed, any protrusions in the weld layer will act like a "blade," continuously rubbing against the screen and causing rapid wear or even breakage. The smooth surface after grinding allows for "zero-damage" contact with the screen, significantly extending its lifespan and reducing production costs. Second, the smooth weld surface reduces the retention and adhesion of media (such as slurry and washing liquid) at the weld, preventing further cracking due to localized corrosion (such as crevice corrosion and electrochemical corrosion), thus improving the corrosion resistance of the repaired area. Furthermore, grinding improves the appearance of the weld, facilitating subsequent visual inspection or non-destructive testing (such as penetrant testing) to ensure the welding quality meets standards and guarantees long-term stable operation of the equipment.
[0036] In some embodiments of this application, the width of the reinforcing rib is 12mm to 15mm, and the thickness is 4mm to 5mm. This size range ensures that the reinforcing rib has sufficient section modulus to withstand the alternating stress during drum operation, while avoiding localized stress concentration or welding deformation due to excessive size. Specifically, a width of 12mm to 15mm provides sufficient lateral support to the fracture site without obstructing the effective filtration area of the bellows; while a thickness of 4mm to 5mm ensures the bending strength of the reinforcing rib itself, enabling it to form a stable "triangular support" structure with the drum body and bellows after full welding, effectively dispersing the stress peak at the fracture point.
[0037] The reasonable combination of width and thickness significantly improves the load-bearing capacity of the reinforcing ribs, preventing the fractured area from expanding further due to centrifugal force during high-speed operation of the equipment, thus solving the industry problem of repeated cracking after corrugated pipe repair welding. Secondly, the 4mm to 5mm thickness matches the thickness of conventional pressure strips (usually around 4mm), facilitating a smooth transition between the surface of the reinforcing ribs and the surface of the corrugated pipe during subsequent grinding, avoiding filter screen wear due to height differences. In addition, the narrow width design of 12mm to 15mm reduces the amount of welding heat input, lowers the risk of deformation of the drum body due to localized heating, and saves welding material costs, achieving a dual optimization of repair efficiency and economy.
[0038] For example, in a paper mill, after repairing the drum with reinforcing ribs 13mm wide and 4.5mm thick, the drum ran continuously for 6 months without any new cracks. In contrast, the control group without reinforcing ribs of this size cracked again after only 2 months of operation, which fully verified the rationality of this size range.
[0039] In some embodiments of this application, when the fracture length of the corrugated pipe is ≤50cm, a reinforcing rib is provided along the axial direction of the corrugated pipe, and the length of the reinforcing rib is consistent with the extension length of the fractured part of the corrugated pipe.
[0040] The axially arranged reinforcing ribs can provide longitudinal tensile force in the direction of centrifugal force of the rotating drum, effectively resisting the radial expansion stress generated by the high-speed rotation of the drum and preventing the fracture crack from opening further under the action of centrifugal force. Setting the length of the reinforcing ribs to be consistent with the extension length of the fractured part achieves "precise coverage" of the damaged area, avoiding support blind spots caused by excessively short reinforcing ribs, and preventing material waste and unnecessary welding heat input caused by excessively long reinforcing ribs, ensuring a smooth transition between the repaired and unrepaired areas.
[0041] The beneficial effects of this solution are mainly reflected in two aspects: "stress matching" and "economic efficiency." Firstly, for small-to-medium-sized fractures (≤50cm), the axial stiffeners act like "miniature bridges" across the cracks, directly transferring the tensile load at the fracture point and significantly reducing the stress concentration factor at the weld root, thereby effectively inhibiting crack propagation. Secondly, the equal-length design minimizes the obstruction of the corrugated pipe's effective filtration area by the stiffeners, ensuring that the dewatering efficiency of the washing machine is not affected. Simultaneously, this targeted local reinforcement method significantly shortens welding time, reduces the size of the heat-affected zone, and lowers the risk of thermal deformation of the drum, achieving cost minimization and time optimization while ensuring repair quality.
[0042] In some embodiments of this application, when the fracture length of the corrugated pipe is greater than 50 cm, multiple reinforcing ribs are provided at intervals along the circumference of the corrugated pipe.
[0043] Specifically, a reinforcing rib can be installed every 25cm.
[0044] When the fracture area is large, simple axial repair is insufficient to resist the complex alternating stress generated during drum operation. In this case, arranging reinforcing ribs along the circumferential direction (i.e., perpendicular to the drum axis) is equivalent to adding multiple "ring hoops" to the outside of the tube, which can significantly enhance the ring stiffness of the drum and effectively restrain the radial expansion deformation of the tube under the action of high-speed rotational centrifugal force. Setting the spacing of the reinforcing ribs to 25 cm ensures that there are sufficiently dense support points in the long fracture area, preventing the corrugated pipe between adjacent reinforcing ribs from bulging or secondary tearing due to the large span, while also avoiding excessive welding and material waste caused by overly dense reinforcing ribs.
[0045] First, the circumferential reinforcing ribs transform the original linear fracture repair into planar structural reinforcement. Multiple ring supports divide the long crack into several controlled small areas, significantly dispersing stress concentration at the fracture site and preventing further expansion of the damage area. Second, the 25-centimeter equidistant design creates a uniform stress grid, ensuring that the deformation of the drum wall is strictly controlled within a safe range when subjected to slurry pressure and centrifugal force, effectively restoring the drum's roundness and dynamic balance. Furthermore, this circumferential reinforcement method complements the original axial corrugated structure, significantly improving the overall fatigue resistance of the drum and ensuring long-term stable operation without structural failure after large-area repair.
[0046] The second aspect of this application provides a reinforcement structure for the corrugated pipe of a washing machine drum, used to implement the reinforcement method for the corrugated pipe of a washing machine drum in any of the embodiments of the first aspect, including: Drum body, bellows, pressure strip, weld repair layer and reinforcing ribs; The bellows is fixedly installed on the drum body, and the pressure strip is attached to the edge of the bellows; The reinforcing ribs are set along the axial or circumferential direction of the corrugated pipe and are fixedly connected to the drum body and the broken part of the corrugated pipe by full welding process.
[0047] While retaining the basic components such as the drum body, bellows, and pressure strip, this structure integrates a repair weld layer and a specially arranged reinforcing rib: the fit error between the warped edge of the bellows and the drum body and pressure strip is controlled between 0.3mm and 0.5mm; the repair weld layer fills the weld gaps between the pressure strip and the bellows using a manual arc welding process, and its thickness is consistent with that of the pressure strip, and its surface is flush with the surface of the bellows after being ground with a grinding wheel; the reinforcing ribs are arranged axially or circumferentially according to the fracture length (≤50cm or >50cm), and are firmly connected to the fractured parts of the drum body and the bellows simultaneously through a full welding process.
[0048] The precise shaping and uniform thickness grinding of the repair weld layer first restores the smoothness of the drum surface and eliminates the risk of filter screen scratches; while the targeted arrangement of reinforcing ribs transforms the stress state of the fractured part from a fragile "thin-walled connection" to a strong "rigid support". Whether it is axial linear support or circumferential grid constraint, it can effectively disperse centrifugal force and slurry pressure, significantly improve the overall structural strength and fatigue resistance of the drum, thereby greatly extending the service life of the equipment and reducing unplanned downtime.
[0049] In some embodiments of this application, the reinforcing ribs are made of steel plates. Specifically, low-carbon steel plates are selected. Low-carbon steel has excellent plasticity and toughness, and excellent weldability. During full welding, it is less prone to hardening or cold cracking, ensuring a dense and strong metallurgical bond between the reinforcing ribs and the drum body and bellows. Simultaneously, the strength of the low-carbon steel plate is sufficient to withstand the alternating stress during drum operation, and its moderate hardness facilitates subsequent grinding, allowing the surface of the reinforcing ribs to smoothly transition to the bellows substrate, avoiding damage to the filter screen.
[0050] First, the low carbon content of low-carbon steel significantly reduces the brittleness of the weld heat-affected zone, effectively preventing cracks in the reinforcing ribs due to stress concentration during welding, thus ensuring the long-term stability of the reinforced structure from the root. Second, the mechanical properties of low-carbon steel plates are similar to those of carbon steel or low-alloy steel commonly used in washing machine drums. The two have good matching in parameters such as coefficient of thermal expansion and modulus of elasticity, which can avoid welding defects of dissimilar steels (such as electrochemical corrosion and thermal stress cracking) caused by material differences. This ensures that the reinforced parts and the drum body work together under complex working conditions such as high-speed operation and temperature changes, further improving the overall durability and operational safety of the equipment.
[0051] The third aspect of this application provides a corrugated pipe for a washing machine drum, including the corrugated pipe reinforcement structure for a washing machine drum in any of the second aspects described above.
[0052] The corrugated pipe for the washing machine drum provided in the third aspect of this application integrates the reinforcement structure of any of the embodiments in the second aspect, forming a fully functional repair unit. This corrugated pipe not only retains its original filtration and support functions, but also pre-strengthens vulnerable parts through a pre-designed reinforcement structure (including the shaped fitting area, an equal-thickness repair weld layer, and fully welded reinforcing ribs). This deep integration of the repair process with the corrugated pipe body transforms it from a simple spare part into a composite component with high structural strength and long service life.
[0053] On the one hand, the corrugated pipe with integrated reinforcement structure has completed the shaping, welding and reinforcement of key parts before installation, which greatly reduces the complexity of on-site maintenance and the operation time, and reduces the dependence on the on-site construction environment and personnel technical level. On the other hand, the factory-prefabricated reinforcement structure can more strictly control the shaping and fitting degree, the thickness of the welding layer and the welding quality of the reinforcing ribs, ensuring the reliability and consistency of the repaired parts, improving the overall operating stability of the drum from the source, and providing a more reliable core component guarantee for the continuous and efficient production of the washing machine.
[0054] For any parts not mentioned in this application, existing technologies may be used or referenced.
[0055] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.
[0056] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A method for reinforcing the corrugated pipe of a washing machine drum, characterized in that, include: a) Shaping step: Use mechanical shaping tools to press and correct the warped edge of the bellows, so that the warped edge is restored to flatness and fits into the drum body; b) Repair welding steps: The weld gap between the pressure bar and the corrugated pipe is repaired by manual electric arc welding to form a repair weld layer; c) Strengthening step: Install reinforcing ribs at the broken or unwelded parts of the bellows. One end of the reinforcing rib is fully welded to the drum body, and the other end is fully welded to the broken part of the bellows to form axial or circumferential support for the broken part.
2. The method for reinforcing the corrugated pipe of the washing machine drum according to claim 1, characterized in that, During the shaping process, the fit error between the corrugated pipe edge and the drum body and pressure strip is controlled to be between 0.3mm and 0.5mm.
3. The method for reinforcing the corrugated pipe of the washing machine drum according to claim 1, characterized in that, During the repair welding process, the welding current should be controlled between 100A and 110A, and the welding voltage between 22V and 23V. After the repair welding is completed, the thickness of the repair weld layer is consistent with the thickness of the pressure strip.
4. The method for reinforcing the corrugated pipe of the washing machine drum according to claim 3, characterized in that, After the welding repair step, the weld repair layer is ground with a grinding wheel to make the surface of the weld repair layer flush with the surface of the corrugated pipe.
5. The method for reinforcing the corrugated pipe of the washing machine drum according to claim 1, characterized in that, The width of the reinforcing rib is 12mm to 15mm, and the thickness is 4mm to 5mm.
6. The method for reinforcing the corrugated pipe of the washing machine drum according to claim 5, characterized in that, When the fracture length of the corrugated pipe is ≤50cm, a reinforcing rib is provided along the axial direction of the corrugated pipe, and the length of the reinforcing rib is consistent with the extension length of the fractured part of the corrugated pipe.
7. The method for reinforcing the corrugated pipe of the washing machine drum according to claim 5, characterized in that, When the fracture length of the corrugated pipe is greater than 50cm, multiple reinforcing ribs are installed at intervals along the circumference of the corrugated pipe.
8. A reinforcing structure for the corrugated pipe of a washing machine drum, used to implement the reinforcing method for the corrugated pipe of a washing machine drum as described in any one of claims 1 to 7, characterized in that, include: Drum body, bellows, pressure strip, weld repair layer and reinforcing ribs; The bellows is fixedly installed on the drum body, and the pressure strip is attached and fixed to the edge of the bellows; The reinforcing ribs are arranged along the axial or circumferential direction of the corrugated pipe and are fixedly connected to the drum body and the broken part of the corrugated pipe respectively by full welding process.
9. The corrugated pipe reinforcement structure for the washing machine drum according to claim 8, characterized in that, The reinforcing ribs are made of steel plates.
10. A corrugated pipe for a washing machine drum, characterized in that, Including the corrugated pipe reinforcement structure of the washing machine drum as described in claim 8 or 9.