A heating element bending device

Abstract

The utility model provides a kind of resistance wire hot bending device, belong to resistance wire technical field.The resistance wire hot bending device, including hot bending main body and two recesses from having on the surface of hot bending main body two ends, it is characterized by: two recesses inside portion is equipped with two conductor heads, two conductor heads are equipped with resistance wire, resistance wire two ends are fixedly connected by two positioning components, hot bending main body inner side wall is inserted with object plate, and inside two ends are equipped with two transformers, object plate surface is provided with resistance wire, two transformers are electrically connected with two conductor heads fixed end respectively, wherein, by two positioning components, the resistance wire placed on the surface of object plate two ends are positioned on two conductor heads, can use the plug-in cooperation structure of positioning component and conductor head, effectively solve the pain point that traditional device resistance wire replacement is difficult.

Description

Technical Field

[0001] This application relates to the field of resistance wire technology, and more specifically, to a resistance wire hot bending device. Background Technology

[0002] In the field of industrial production and processing, resistance wire hot bending equipment plays an important role in the local hot bending forming process of materials such as plastics and thin metals due to its significant characteristics of concentrated heating and strong temperature control. It is widely used in many scenarios such as right-angle bending of acrylic display racks, processing of PVC pipe elbows, and shaping of small metal brackets.

[0003] Currently, the wear and tear of the core component, the resistance wire, in existing resistance wire hot bending devices is a significant problem during long-term use. The resistance wire undergoes frequent heating and cooling cycles, which generate repeated thermal expansion and contraction stresses, leading to material fatigue. Simultaneously, under high-temperature operating conditions, the resistance wire readily oxidizes with oxygen in the air, forming an oxide layer that significantly weakens its structural strength. These combined factors make the resistance wire prone to brittleness and breakage. In existing devices, the resistance wire is typically fixed with bolts. This method inherently has drawbacks, which become fully apparent when the resistance wire becomes brittle or breaks due to the aforementioned heating / cooling cycles and oxidation, requiring replacement. Operators must use tools to remove the bolts, a cumbersome and labor-intensive process that not only consumes considerable time and manpower but also risks damaging other components at the connection point during disassembly and reinstallation, further impacting the device's lifespan and operational stability. Utility Model Content

[0004] To overcome the above deficiencies, this application provides a resistance wire hot bending device to solve the problem mentioned in the background art where resistance wires are difficult to replace due to bolt fixing.

[0005] To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problem is as follows:

[0006] A resistance wire hot bending device includes a hot bending body and two grooves on both ends of the surface of the hot bending body. The device is characterized in that: two conductor heads are respectively provided inside the two grooves, and the resistance wire is sleeved on the two conductor heads. The two ends of the resistance wire are fixedly connected by two positioning components. A carrying plate is inserted into the inner wall of the hot bending body, and two transformers are provided at both ends inside the carrying plate. The resistance wire is placed on the surface of the carrying plate, and the two transformers are electrically connected to the fixed ends of the two conductor heads.

[0007] Furthermore, the junction between the outer wall of the conductor head and the surface of the groove is arc-shaped and matches the bottom of the positioning component.

[0008] Furthermore, the resistance wire is in a planar unfolded shape and placed on the surface of the carrier plate. The two ends of the resistance wire have collars, and the inner ring of the collar is sleeved with the outer end of the conductor head.

[0009] Furthermore, the positioning assembly includes a bottom pad ring, a top pad ring, an elliptical hole, a positioning cover, a plug-in post, and several spring plates. The bottom pad ring has an outward arc shape at its bottom end, which matches the arc groove, and its inner ring is sleeved with the outer wall of the conductor head, with its surface fitting against the bottom of the sleeve ring. The inner ring of the top pad ring is sleeved with the outer wall of the conductor head, and its bottom is fitting against the surface of the sleeve ring. The elliptical hole is formed on the surface of the conductor head. The top of the positioning cover is integrally formed with the top of the plug-in post. Several spring plates are welded to the outer wall of the plug-in post, and several spring plates are inserted into the elliptical hole.

[0010] Furthermore, the outer wall of the positioning cover is provided with an anti-slip groove, and the bottom end is in close contact with the surface of the top pad ring.

[0011] Furthermore, the carrier plate is made of ceramic fiber or high-temperature resistant composite material, and its surface is covered with a high-temperature resistant, insulating and moderately thermally conductive material, and is inserted into the two notches on both sides of the hot bending body.

[0012] Furthermore, the outer wall of the hot bending body has two connector seats on both sides, and the two connector seats are electrically connected to the two transformers and the two conductor heads respectively.

[0013] This utility model has the following beneficial effects:

[0014] 1. This utility model abandons the traditional bolt fixing method and adopts a plug-in mating structure between the positioning component and the conductor head. The bottom pad ring is first fitted onto the outer end of the conductor head, and then the collars at both ends of the resistance wire are fitted onto the outer end of the conductor head. The top pad ring clamps the collars from both ends. Finally, the plug-in post of the positioning cover carries the spring plate and is inserted into the elliptical hole of the conductor head, thus completing the rapid fixing of the resistance wire. When the resistance wire becomes brittle or breaks due to frequent hot and cold cycles or oxidation, the fixing can be released simply by pulling out the positioning cover, achieving "second-level replacement" of the resistance wire. The entire process requires no tools, greatly shortening the operation time and effectively solving the pain point of difficult resistance wire replacement in traditional devices.

[0015] 2. The arc-groove design at the connection between the outer wall of the conductor head and the groove of this utility model precisely matches the outer arc-shaped bottom pad ring at the bottom of the positioning component, which can ensure that the resistance wire collar is subjected to uniform force during clamping and avoid poor contact caused by local stress concentration. At the same time, the elastic resistance of the spring sheet in the elliptical hole can ensure a tight connection between the positioning component and the conductor head, reduce contact resistance, ensure stable current transmission, thereby maintaining the consistency of the heating temperature of the resistance wire and improving the accuracy of hot bending.

[0016] 3. The carrier plate of this utility model is made of ceramic fiber or high-temperature resistant composite material, and its surface is covered with a high-temperature resistant, insulating and moderately thermally conductive material. This can effectively block the heat of the resistance wire from being transferred to the hot bending body, protecting the internal components of the device (such as the transformer) from high temperature, and also prevent operators from being burned when they come into contact with the carrier plate. In addition, the connector seat integrates the electrical connection between the transformer and the conductor head, reducing exposed wires, lowering the risk of leakage or short circuit, and further improving the safety performance of the device.

[0017] 4. The planar unfolded resistance wire design of this utility model, combined with the pluggable and replaceable carrier plate, allows for flexible adjustment of the resistance wire shape or replacement of the appropriate carrier plate according to different hot bending requirements (such as bending path and material type), thus expanding the applicability of the device; the anti-slip groove design on the outer wall of the positioning cover further enhances the ease of operation and meets the ergonomic requirements of actual production. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the resistance wire hot bending device provided in the embodiments of this application;

[0020] Figure 2 A schematic diagram of the carrier plate extraction structure provided in the embodiments of this application;

[0021] Figure 3 A schematic diagram of the connection structure between the hot bending body and the conductor head, the transformer, and the connector seat provided for the embodiments of this application;

[0022] Figure 4 A schematic diagram of the resistance wire structure provided for an embodiment of this application;

[0023] Figure 5 Provided for the implementation of this application Figure 2Enlarged structural diagram at point A in the middle;

[0024] Figure 6 Provided for the implementation of this application Figure 3 Enlarged structural diagram at point B;

[0025] Figure 7 A schematic diagram of the internal structure of the positioning cover provided for an embodiment of this application;

[0026] Figure 8 A schematic diagram of the top pad ring structure provided for an embodiment of this application;

[0027] Figure 9 A schematic diagram of the bottom ring structure provided for an embodiment of this application.

[0028] In the diagram: 1-Hot bending body; 2-Groove; 3-Conductor head; 4-Resistance wire; 5-Positioning component; 6-Carrier plate; 7-Transformer; 41-Collar ring; 51-Bottom pad ring; 52-Top pad ring; 53-Oval hole; 54-Positioning cover; 55-Plug-in post; 56-Spring sheet; 8-Connector seat. Detailed Implementation

[0029] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0030] Example:

[0031] Please see Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 A resistance wire hot bending device includes a hot bending body 1 and two grooves 2 on both ends of the surface of the hot bending body 1; and two connector seats 8 on both sides of the outer wall of the hot bending body 1.

[0032] The hot-bending body 1 is made of non-conductive and high-temperature resistant material and is used to support the functional components of the equipment. Its diagonal ends are chamfered to improve operational safety; the bottom is equipped with anti-slip pads to effectively suppress equipment displacement and ensure operational stability.

[0033] The hot bending body 1 has grooves 2 at both ends of its surface, each groove being two-thirds the length of the body and 20mm deep. This design allows the resistance wire 4 to be embedded in the conductor head 3 via the positioning component 5, ensuring that the resistance wire 4 is below the surface of the hot bending body 1. This structure not only facilitates the user's hot bending operation on the material to be processed using the resistance wire 4, but also provides effective protection for the resistance wire 4.

[0034] The hot bending body 1 has two connector seats 8 on both sides of its outer wall, both of which are aviation plug cores with waterproof caps. The connector seats 8 are connected to an external power source and the input terminals of the two transformers 7 via wires, respectively, to supply power to the transformers 7. Both connector seats 8 are fixed to the outer walls of the hot bending body 1 on both sides with bolts, and their interfaces are sealed to provide a certain degree of dust and water resistance.

[0035] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 A resistance wire hot bending device includes two grooves 2, each containing two conductor heads 3. A resistance wire 4 is fitted onto each conductor head 3. The two ends of the resistance wire 4 are fixedly connected by two positioning components 5. A carrying plate 6 is inserted into the inner wall of the hot bending body 1, and two transformers 7 are provided at both ends inside. The resistance wire 4 is placed on the surface of the carrying plate 6. The two transformers 7 are electrically connected to the fixed ends of the two conductor heads 3 respectively. The resistance wire 4 has collars 41 at both ends. The positioning components 5 include a bottom pad ring 51, a top pad ring 52, an elliptical hole 53, a positioning cover 54, an insertion post 55, and several spring plates 56.

[0036] The conductor head 3 is made of highly conductive copper. Its transverse section, near the end of the groove 2, has an arc-shaped groove structure that smoothly transitions into the surface of the groove 2. The conductor head 3 is electrically connected to the transformer 7, enabling efficient conduction of the safe voltage output from the transformer 7 to the resistance wire 4.

[0037] The resistance wire 4 is made of a high-resistivity, high-temperature resistant alloy wire, such as nickel-chromium alloy wire. Its main body is planar and arranged in a serpentine pattern to provide a uniform heating area. The resistance wire 4 is laid flat on the upper surface of the carrier plate 6 to ensure efficient heat conduction when in contact with the material being processed. Both ends of the resistance wire 4 are integrally formed or firmly welded with metal collars 41. These collars 41 are made of materials with good conductivity and high temperature resistance, such as copper or stainless steel. The inner ring size of the collar 41 precisely matches the outer end size of the conductor head 3. During installation, the outer end of the conductor head 3 is tightly fitted into the inner ring of the collar 41, forming a reliable mechanical connection and electrical contact. This connection method not only ensures low-resistance and efficient current conduction from the conductor head 3 to the resistance wire 4, but also facilitates the installation, positioning, and replacement of the resistance wire 4. Furthermore, the design of the collar 41 effectively protects the ends of the resistance wire 4, preventing damage from bending or stress during installation and use, significantly improving the service life and operational reliability of the resistance wire 4.

[0038] The positioning component 5 is a key structure ensuring precise positioning, reliable clamping, and a stable electrical connection between the conductor head 3 and the end collar 41 of the resistance wire 4. The bottom ring 51 and top ring 52 are made of high-strength, high-temperature resistant material. The bottom end of the bottom ring 51 is designed with an outward arc shape, which precisely matches the arc groove at the end of the transverse section of the conductor head 3, ensuring that the bottom ring 51 can stably fit within the arc groove. Its inner ring size fits tightly against the outer wall of the conductor head 3, achieving radial positioning. Its upper surface is designed as a flat surface to tightly fit against the bottom of the end collar 41 of the resistance wire 4, providing bottom support and insulation. The inner ring size of the top ring 52 also fits tightly against the outer wall of the conductor head 3, achieving radial positioning. Its lower surface is designed as a flat surface to tightly fit against the top surface of the end collar 41 of the resistance wire 4, providing top clamping and insulation. The elliptical hole 53 is directly formed on the surface of the conductor head 3. The hole is elliptical, and its major axis is usually aligned with the axial direction of the conductor head 3 or set as needed. It is used to accommodate and guide the insertion post 55 and spring plate 56 of the positioning cover 54. The positioning cover 54 and the insertion post 55 are made of the same material as the bottom gasket ring 51. The top of the inner part of the positioning cover 54 and the top of the insertion post 55 are integrally molded to ensure structural strength and connection reliability. The main function of the positioning cover 54 is to provide an operating handle and cover protection. The outer diameter of the insertion post 55 is designed to be inserted into the elliptical hole 53 on the conductor head 3. The insertion post 55 is the core component for transmitting clamping force and achieving positioning. The spring plate 56 is made of a thin metal sheet with good elasticity and conductivity, such as phosphor bronze or beryllium copper. Several spring plates 56, usually 2-4 pieces, are evenly distributed around the circumference and firmly fixed to the outer wall of the insertion post 55 by welding. The spring plates 56 are slightly open outward in the free state. In addition, the outer wall of the positioning cover 54 can be provided with anti-slip grooves of different shapes according to actual conditions or user preferences, which can increase the friction between the user's fingers and the positioning cover 54 and improve the user experience.

[0039] The basic positioning process involves first embedding the bottom ring 51 into the arc groove of the conductor head 3 with its outer arc-shaped bottom end, while its inner ring is fitted onto the outer wall of the conductor head 3. The collar 41 at the end of the resistance wire 4 is then fitted onto the outer end of the conductor head 3, allowing its bottom to naturally rest on the upper surface of the bottom ring 51. Next, the top ring 52 is fitted onto the outer wall of the conductor head 3, with its lower surface pressed against the top surface of the collar 41. At this point, the bottom ring 51 and the top ring 52 clamp and fix the collar 41 from both above and below, ensuring it remains coaxial and in close contact with the conductor head 3, providing a foundation for low-resistance electrical connection. Finally, the positioning cover 54, along with its integrally formed plug post 55 and the spring plate 56 welded to the plug post 55, is aligned with the elliptical hole 53 on the surface of the conductor head 3 and inserted downwards. During insertion, the spring plate 56 is elastically deformed inwards by the pressure of the elliptical hole 53 wall. When the plug post 55 is inserted into place, and the spring plate 56 has fully passed through the elliptical hole 53 or reached the predetermined depth, the spring plate 56 springs outward due to its own elastic restoring force, and its outer edge locks into the lower edge of the elliptical hole 53 or a specific locking position. At the same time, the lower surface of the positioning cover 54 presses against the upper surface of the top pad ring 52, applying additional downward pressure, further strengthening the clamping force of the bottom pad ring 51 and the top pad ring 52 on the collar 41, and locking the entire assembly.

[0040] The substrate of the support plate 6 is made of ceramic fiberboard or high-temperature resistant composite material. This ensures that it will not deform or pulverize at high temperatures. It effectively prevents heat from being conducted to the lower bending body 1, improving thermal efficiency and protecting the main structure. The surface of the support plate 6 is also covered with a high-temperature resistant, insulating material with moderate thermal conductivity. Compared with pure ceramic fiberboard, it has better impact resistance and load-bearing capacity, is less prone to breakage, and extends the service life of the support plate 6.

[0041] Transformer 7 is the core power control component of the hot bending equipment, responsible for converting the externally input high-voltage AC power into the low-voltage, high-current required by the resistance wire 4, thus achieving precise and safe heating control. Two transformers 7 are installed at both ends inside the hot bending body 1 and electrically connected to the conductor head 3 and connector seat 8, which increases the safety of the device.

[0042] It should be noted that the specific models and specifications of the resistance wire 4, transformer 7, and connector 8 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0043] The power supply and operating principle of the resistance wire 4, transformer 7, and connector 8 are clear to those skilled in the art and will not be described in detail here.

[0044] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A resistance wire hot bending device, comprising a hot bending body (1) and two grooves (2) on both ends of the surface of the hot bending body (1), characterized in that: Two conductor heads (3) are respectively provided inside the two grooves (2), and resistance wires (4) are sleeved on the two conductor heads (3). The two ends of the resistance wires (4) are fixedly connected by two positioning components (5). A carrying plate (6) is inserted into the inner wall of the hot bending body (1), and two transformers (7) are provided at both ends inside. The resistance wires (4) are placed on the surface of the carrying plate (6), and the two transformers (7) are electrically connected to the fixed ends of the two conductor heads (3) respectively.

2. The resistance wire hot bending device according to claim 1, characterized in that, The outer wall of the conductor head (3) is arc-shaped at the connection with the surface of the groove (2) and matches the bottom of the positioning component (5).

3. The resistance wire hot bending device according to claim 2, characterized in that, The resistance wire (4) is in a planar unfolded shape and is placed on the surface of the carrier plate (6). The two ends of the resistance wire (4) are equipped with collars (41), and the inner ring of the collar (41) is sleeved with the outer end of the conductor head (3).

4. The resistance wire hot bending device according to claim 3, characterized in that, The positioning component (5) includes a bottom pad ring (51), a top pad ring (52), an elliptical hole (53), a positioning cover (54), a plug-in post (55), and several spring pieces (56). The bottom pad ring (51) has an outward arc shape at its bottom end, which matches the arc groove. Its inner ring is sleeved with the outer wall of the conductor head (3), and its surface is in contact with the bottom of the collar (41). The inner ring of the top pad ring (52) is sleeved with the outer wall of the conductor head (3), and its bottom is in contact with the surface of the collar (41). The elliptical hole (53) is opened on the surface of the conductor head (3). The top of the positioning cover (54) is integrally formed with the top of the plug-in post (55). Several spring pieces (56) are welded to the outer wall of the plug-in post (55), and the plug-in post (55) carries several spring pieces (56) to be inserted into the elliptical hole (53).

5. The resistance wire hot bending device according to claim 4, characterized in that, The outer wall of the positioning cover (54) is provided with an anti-slip groove, and the bottom end is in close contact with the surface of the top pad ring (52).

6. The resistance wire hot bending device according to claim 5, characterized in that, The carrier plate (6) is made of ceramic fiber or high temperature resistant composite material, and its surface is covered with a high temperature resistant, insulating and moderately thermally conductive material, and is inserted into the two notches on both sides of the hot bending body (1).

7. The resistance wire hot bending device according to claim 6, characterized in that, The hot bending body (1) has two connector seats (8) on both sides of its outer wall. The two connector seats (8) are electrically connected to the two transformers (7) and the two conductor heads (3) respectively.

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