Composite material rod tube

Abstract

This utility model discloses a composite material rod-tube, including an alloy component in the shape of a cylinder with an axially penetrating hollow cylindrical cavity. An iron rod is coaxially disposed within the cylindrical cavity, and a circular boss is formed at each end of the iron rod. An annular welding space is formed between the outer peripheral wall of each circular boss and the corresponding end face of the alloy component. The annular welding space is used to accommodate solder to achieve a fixed connection between the alloy component and the iron rod. By coaxially embedding the iron rod within the alloy component, the two work together to form an annular welding space, providing a carrier for the solder. During brazing, the molten solder fully wets the annular welding space under capillary action. After the solder cools, it forms a positioning and connection strengthening structure, rigidly connecting the alloy component and the iron rod. This effectively avoids the interlayer slippage problem that occurs when the aluminum alloy-clad iron rod is subjected to long-term high-frequency reciprocating motion, meeting the structural strength requirements of printer / copier components under high-frequency motion scenarios.

Description

Technical Field

[0001] This utility model relates to the field of parts processing technology for printers / copiers, and in particular to a composite material rod tube. Background Technology

[0002] The core moving parts of office equipment such as printers and copiers are mainly made of iron. However, the processing solutions for iron parts of these devices have obvious defects: although the strength of a single iron part meets the standards, the surface needs to be electroplated or phosphated to prevent rust. Such processing processes generate pollutants such as waste liquid containing heavy metals and acids and alkalis, which harm the natural and social environment. In order to solve the above problems, some solutions adopt a composite structure of "aluminum alloy-clad iron rod". The core processing technology is as follows: after the iron rod is inserted into the inner hole of the aluminum tube, the aluminum-iron assembly is cold-drawn by a cold drawing die, so that the aluminum alloy is tightly clad on the surface of the iron rod to form a composite material rod and tube.

[0003] Although this process avoids direct exposure of iron by using aluminum alloy cladding and does not require additional rust prevention treatment to meet environmental protection requirements, the existing cold drawing cladding solution still has shortcomings: it lacks targeted positioning and connection reinforcement structures, and the aluminum alloy clad iron rod may slip relative to the iron rod under long-term high-frequency movement, thereby affecting the service life of the component and the operating accuracy of the equipment, making it difficult to fully adapt to the stringent usage requirements of the core components of printers and copiers. Utility Model Content

[0004] The purpose of this invention is to provide a composite material rod tube that partially solves or alleviates the above-mentioned deficiencies in the prior art, and can improve the overall strength of the alloy-coated iron rod to meet the stringent usage requirements of the core components of printers and copiers. Technical solution

[0005] A composite material rod-tube, characterized in that it comprises: The alloy component is cylindrical in shape and has an axially continuous hollow cylindrical cavity inside. An iron rod is coaxially disposed in the cylindrical inner cavity. A circular boss is formed at each end of the iron rod. An annular welding space is formed between the outer peripheral wall of each circular boss and the corresponding end face of the alloy component. The annular welding space is used to accommodate the solder to achieve a fixed connection between the alloy component and the iron rod.

[0006] Furthermore, in some embodiments, the axial end face of each of the circular bosses is coplanar with the axial end face of the corresponding end of the alloy component.

[0007] Furthermore, in some embodiments, the alloy component is made of aluminum alloy, magnesium alloy, or titanium alloy.

[0008] Furthermore, in some embodiments, friction stripes are formed on the outer peripheral wall of the iron rod.

[0009] Furthermore, in some embodiments, the inner wall of the alloy component is provided with at least two limiting members spaced apart circumferentially, and the outer peripheral wall of the iron rod is provided with a number of movable grooves corresponding to the limiting members. The movable grooves extend axially along the iron rod, and the cross-sectional shape of the movable grooves is adapted to the cross-sectional shape of the limiting members. The limiting members are embedded in the corresponding movable grooves. The movable grooves are used to assist the iron rod in moving along the extension direction of the limiting members, and the limiting members are used to restrict the circumferential rotation of the iron rod.

[0010] Furthermore, in some embodiments, the cross-sectional shape of the limiting member is semi-circular or rectangular.

[0011] Furthermore, in some embodiments, the axial length of the limiting member is less than the axial length of the movable groove.

[0012] Furthermore, in some embodiments, each of the circular bosses has at least two slots.

[0013] Furthermore, in some embodiments, the two corresponding end faces of the alloy component are respectively provided with welding grooves, and the radial positions of the welding grooves correspond to the slots and the annular welding space, forming a through-type solder flow channel.

[0014] Furthermore, in some embodiments, the weld groove is an annular groove or a rectangular groove.

[0015] This utility model has the following advantages: By coaxially embedding the iron rod within the alloy component, the two work together to form an annular welding space that provides a carrier for the solder. During brazing, the molten solder fully wets the annular welding space under capillary action. After the solder cools, it forms a positioning and connection reinforcement structure, achieving a rigid connection between the alloy component and the iron rod. This effectively avoids the interlayer slippage problem that occurs when the aluminum alloy-clad iron rod is subjected to long-term high-frequency reciprocating motion, ensuring the service life of the component and the operating accuracy of the equipment, and meeting the structural strength requirements of printer / copier parts under high-frequency motion scenarios. The composite material rod tube, through the structural design of the alloy component tightly encasing the iron rod, significantly reduces the overall weight of the composite material rod tube, achieving a lightweight design.

[0016] By tightly encasing the iron rod in aluminum alloy, a physical protective layer is formed that isolates it from air and moisture. This fundamentally replaces the electroplating and phosphating processes required for traditional iron parts. This design completely avoids the damage to soil, water and atmospheric environment caused by heavy metal waste liquid and acid and alkali pollutants generated during electroplating / phosphating. It also reduces the investment and operating costs of environmental protection equipment during production, meeting the environmental protection requirements of green manufacturing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an exemplary embodiment of the present invention.

[0018] Figure 2 This is a cross-sectional structural diagram of an exemplary embodiment of the present invention.

[0019] Figure 3 This is an enlarged structural schematic diagram of A, an exemplary embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of another exemplary embodiment of the present invention.

[0021] Figure 5 This is a cross-sectional structural schematic diagram of another exemplary embodiment of the present invention.

[0022] Figure 6 This is an enlarged structural schematic diagram of B, which is another exemplary embodiment of the present invention.

[0023] In the above attached figures: 1: alloy component, 2: iron rod, 3: circular boss, 4: annular cavity, 5: limiting component, 61: slot, 62: annular groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0025] like Figures 1 to 3The illustration shows one embodiment of a composite material rod tube according to the present invention. This composite material rod tube is applicable to the field of component processing technology for printers / copiers. Specifically, it includes an alloy component 1 with a wall thickness of 1.5mm, which is integrally formed from high-strength aluminum alloy and has a cylindrical structure with both ends through. The interior forms a hollow cylindrical cavity that runs through the axis. An iron rod 2 is coaxially embedded in the cylindrical cavity. The diameter of the iron rod 2 is 7.8mm and it is made of high-strength iron rod. In addition, friction stripes are formed on the outer peripheral wall of the iron rod 2. A circular boss 3 is formed at each end of the iron rod 2. The maximum outer diameter of the circular boss 3 is equal to the outer diameter of the iron rod 2. An annular welding space is formed between the outer peripheral wall of each circular boss 3 and the corresponding end face of the alloy component 1. The annular welding space is used to accommodate solder to achieve a fixed connection between the alloy component 1 and the iron rod 2, so as to meet the connection strength requirements of printer / copier components in high-frequency motion scenarios.

[0026] In this embodiment, alloy component 1 and iron rod 2 need to be welded together to form a composite material rod tube. First, the iron rod 2 is coaxially embedded into the hollow cylindrical cavity of alloy component 1, and the end faces of the circular bosses 3 at both ends of alloy component 1 and iron rod 2 are set in a coplanar manner. The friction stripes on the outer peripheral wall of iron rod 2 are used to increase the contact friction between it and the inner wall of alloy component 1, so as to achieve pre-fixation after assembly, effectively preventing axial movement or circumferential rotation before welding, and facilitating subsequent welding processes.

[0027] During welding, brazing is used to weld the assembled alloy component 1 to the iron rod 2. The solder is heated to a molten state, allowing it to fully wet the inner wall of the annular welding space under capillary action and completely fill the gaps in the annular welding space. After the solder cools and solidifies, a high-strength metallurgical bonding surface is formed, achieving a rigid connection between the alloy component 1 and the iron rod 2. This effectively avoids the interlayer slippage problem that occurs when the aluminum alloy-clad iron rod is subjected to long-term high-frequency reciprocating motion, ensuring the service life of the component and the operating accuracy of the equipment, and meeting the structural strength requirements of printer / copier components under high-frequency motion scenarios. The composite material rod and tube, through its structural design of tightly encasing an iron rod with aluminum alloy, significantly reduces the overall weight of the composite material rod and tube, achieving a lightweight design. The circumferential tight encasing of the iron rod with aluminum alloy forms a physical protective layer that isolates air and moisture, fundamentally replacing the electroplating, phosphating, and other rust prevention processes required for traditional iron components. This design completely avoids the damage to soil, water, and atmospheric environments caused by heavy metal waste liquid and acid and alkali pollutants generated during electroplating / phosphating, and also reduces the investment and operating costs of environmental protection equipment during the production process, meeting the environmental protection requirements of green manufacturing.

[0028] After welding, the two ends of the composite material rod are mechanically polished to remove excess solder, slag and burrs from the end face, so that the flatness error of the end face is controlled within 0.01mm, forming a flat and smooth assembly reference surface, avoiding interference with other parts of the printer / copier during subsequent assembly, and ensuring the stability of equipment operation.

[0029] In some embodiments, the axial end face of each circular boss 3 is coplanar with the axial end face of the corresponding end of the alloy component 1. In this embodiment, the coplanar structure of each circular boss 3 and the alloy component 1 can form a flat and uniform assembly reference surface, thereby reducing the positioning deviation when assembling the composite material rod tube with other parts of the printer / copier, reducing the difficulty of assembly alignment, and avoiding assembly interference caused by the height difference of the end faces, thus improving the overall assembly efficiency and connection accuracy. Alternatively, in other embodiments, the axial end face of the circular boss 3 may be lower than the axial end face of the corresponding end of the alloy component 1. The advantage of this structure is that it can form a larger welding space, completely covering both ends of the iron rod, preventing the iron rod from rusting, thereby completely blocking the contact path between the iron rod end and air and moisture. Combined with the circumferential coating of the iron rod with aluminum alloy, a comprehensive anti-corrosion system of "circumferential coating + end welding sealing" is formed, maximizing the reduction of the risk of iron rod corrosion.

[0030] In some embodiments, the alloy component 1 is made of aluminum alloy, magnesium alloy, or titanium alloy. In this embodiment, the alloy component 1 can be made of any one of aluminum alloy, magnesium alloy, or titanium alloy, and the iron rod 2 is made of high-strength iron. Through this material combination design, the alloy component 1 and the iron rod 2 are welded and fixed by a brazing process to form an integrated composite material rod tube. This composite material rod tube utilizes the low-density characteristics of aluminum alloy, magnesium alloy, or titanium alloy to achieve lightweighting, meeting the weight reduction requirements of the moving parts of the printer / copier. This allows the outer lightweight alloy and the inner high-rigidity iron to complement each other, effectively adapting to the high-frequency reciprocating motion usage scenarios of the printer / copier, while taking into account both equipment operating efficiency and component lifespan.

[0031] In some embodiments, to further enhance the strength of the alloy component 1 and the iron rod 2 after assembly and to meet the high-frequency movement requirements of printer / copier parts, at least two limiting members 5 are evenly spaced along the circumferential direction on the inner wall of the alloy component 1. The outer circumferential wall of the iron rod 2 is provided with a number of movable grooves corresponding to the limiting members 5. The movable grooves extend along the axial direction of the iron rod 2, and the cross-sectional shape of the movable grooves is adapted to the cross-sectional shape of the limiting members 5 to ensure that the two fit tightly after being installed. The limiting members 5 are embedded in the corresponding movable grooves. The movable grooves are used to assist the iron rod 2 in moving along the extension direction of the limiting members 5. The limiting members 5 are used to restrict the circumferential rotation of the iron rod 2.

[0032] In this embodiment, during assembly, the limiting member 5 is correspondingly embedded in each movable groove to form a composite fit structure of axial guidance and circumferential stop: on the one hand, the movable groove provides a precise guiding path for the axial movement of the iron rod 2 relative to the alloy component 1, ensuring that the iron rod 2 slides smoothly along the axial direction, which is convenient for coaxial positioning before welding; on the other hand, the contour matching structure of the limiting member 5 and the movable groove can form a rigid circumferential stop, which directly restricts the iron rod 2 from circumferentially rotating relative to the alloy component 1, and avoids the relative displacement between the two during the welding process from affecting the welding accuracy.

[0033] In some embodiments, the cross-sectional shape of the limiting member 5 is semi-circular or rectangular. The semi-circular structure can reduce the guiding resistance during assembly, while the rectangular structure has stronger circumferential stopping rigidity. The specific shape can be flexibly selected according to the requirements.

[0034] In some embodiments, the axial length of the limiting member 5 is less than the axial length of the movable groove, thus forming a reserved space in the movable groove that is not occupied by the limiting member 5. This reserved space can accommodate molten solder during the brazing process. After the molten solder fills the reserved space, it can cooperate with the solder in the annular welding space to more fully fix the iron rod 2 and the alloy component 1. Combined with the original circumferential stop of the limiting member 5, the iron rod 2 is double-positioned and fixed, which further enhances the strength of the composite material rod tube, significantly improves the structural stability and service life of the product, and can meet the high-frequency movement requirements of printer / copier parts. Example 2

[0035] like Figures 4 to 6As shown, this embodiment is similar to embodiment one, except that each circular boss 3 is provided with at least two slots 61, and the two corresponding end faces of the alloy component 1 are respectively provided with welding grooves. The radial position of the welding groove corresponds to the slots 61 and the annular welding space, forming a through-type solder flow channel. The welding groove is an annular groove 62 or a rectangular groove. The slot 61 has a dual function. On the one hand, during assembly before welding, the slot 61 can serve as a clamping and positioning station, facilitating the clamping equipment to accurately clamp the iron rod 2, achieving stable insertion of the iron rod 2 into the inner cavity of the alloy component 1, and improving assembly alignment efficiency. On the other hand, during the welding process, the friction stripes on the outer peripheral wall of the iron rod 2 are pre-set to increase the contact friction between it and the inner wall of the alloy component 1, completing the pre-fixation after assembly and preventing axial movement or circumferential displacement of the iron rod 2 before welding. Subsequently, the brazing process is used to heat the solder. Under the action of capillary action and gravity, the molten solder fully wets and fills the three connected channels formed by the annular welding space, the slot 61, and the annular groove 62. After the solder cools and solidifies, an integrated welding clamp is formed. This welding clip not only firmly connects the alloy component 1 to the iron rod 2, but its contour-fitting structure with the slot 61 and the annular groove 62 can also form a circumferential stop, effectively restricting the iron rod 2 from rotating circumferentially relative to the alloy component 1, further improving the stability and torsional resistance of the connection between the two, and adapting to the mechanical requirements of high-frequency reciprocating motion scenarios of printer / copier parts.

[0036] Alternatively, in other embodiments, to optimize the processing technology and reduce production costs, the annular groove 62 on the end face of the alloy component 1 can be replaced with a pair of rectangular grooves symmetrically opened along the circumference of the end face. During welding, the molten solder can also flow smoothly into the slot 61, the rectangular grooves and the annular welding space, and form an integrated welding clamp after cooling. While ensuring the connection strength between the iron rod 2 and the alloy component 1, the material loss and labor cost of the groove processing are reduced, taking into account both product performance and economy.

[0037] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A composite material rod-tube, characterized in that, include: The alloy component is cylindrical in shape and has an axially continuous hollow cylindrical cavity inside. An iron rod is coaxially disposed in the cylindrical inner cavity. A circular boss is formed at each end of the iron rod. An annular welding space is formed between the outer peripheral wall of each circular boss and the corresponding end face of the alloy component. The annular welding space is used to accommodate the solder to achieve a fixed connection between the alloy component and the iron rod.

2. The composite material rod-tube according to claim 1, characterized in that, The axial end face of each of the circular bosses is coplanar with the axial end face of the corresponding end of the alloy component.

3. The composite material rod-tube according to claim 1, characterized in that, The alloy components are made of aluminum alloy, magnesium alloy, or titanium alloy.

4. The composite material rod-tube according to claim 1, characterized in that, The outer peripheral wall of the iron rod is provided with friction stripes.

5. A composite material rod-tube according to claim 1, characterized in that, The inner wall of the alloy component is provided with at least two limiting members spaced apart circumferentially. The outer peripheral wall of the iron rod is provided with a number of movable grooves corresponding to the limiting members. The movable grooves extend along the axial direction of the iron rod, and the cross-sectional shape of the movable grooves is adapted to the cross-sectional shape of the limiting members. The limiting members are embedded in the corresponding movable grooves. The movable grooves are used to assist the iron rod in moving along the extension direction of the limiting members. The limiting members are used to restrict the circumferential rotation of the iron rod.

6. A composite material rod-tube according to claim 5, characterized in that, The cross-sectional shape of the limiting member is semi-circular or rectangular.

7. A composite material rod-tube according to claim 6, characterized in that, The axial length of the limiting member is less than the axial length of the movable groove.

8. A composite material rod-tube according to claim 1, characterized in that, Each of the circular bosses has at least two slots.

9. A composite material rod-tube according to claim 8, characterized in that, Weld grooves are respectively provided on two corresponding end faces of the alloy component. The radial position of the weld grooves corresponds to the slot and the annular welding space, forming a through-type weld flow channel.

10. A composite material rod-tube according to claim 9, characterized in that, The weld groove is an annular groove or a rectangular groove.

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