A guide structure of a tension spring assembly device

Abstract

The utility model provides a kind of guiding structure of tension spring assembly device, belong to tension spring automation assembly technical field, the guiding structure of this tension spring assembly device is used to position guiding to tension spring in tension spring assembly process, including guide seat and guide rod, the guide seat is provided with guide channel, the entrance end of the guide channel is flared structure of horn, the outlet end of the guide channel is cylindrical through-hole structure, the guide rod is conical rod body structure, the conical end of the guide rod is towards the entrance end of guide channel and is set, the maximum outer diameter of the conical end of the guide rod is less than the inner diameter of guide channel outlet end cylindrical through-hole, the axis of the guide rod coincides with the central axis of guide channel;The utility model can solve the technical problem that tension spring is difficult to accurately enter predetermined assembly position in tension spring assembly process due to insufficient guiding precision.

Description

Technical Field

[0001] This utility model belongs to the field of automated assembly technology of tension springs, and more specifically, it relates to a guide structure for a tension spring assembly device. Background Technology

[0002] Tension springs, as a commonly used elastic element, are widely used in many fields such as machinery, automobile manufacturing, and home appliances. In the production and application of tension springs, assembly is a critical process that directly affects product quality and production efficiency. Currently, tension spring assembly mainly employs manual or semi-automatic methods. In manual assembly, operators need to accurately hook or insert the end hooks or coils of the tension spring into the designated assembly positions. Due to the elasticity of the tension spring and its small end structure, operators often find it difficult to accurately grasp the position and posture of the spring during assembly, resulting in a high failure rate and low efficiency. Prolonged repetitive operations can also easily cause worker fatigue and occupational injuries. To improve assembly efficiency, some companies have adopted semi-automatic assembly equipment. Semi-automatic assembly equipment typically uses simple positioning fixtures or guide grooves to guide tension springs into the assembly position. However, these guide structures are often simply designed with insufficient guiding accuracy, making them prone to tension spring misalignment and jamming. Especially when handling tension springs of different specifications, the existing guide structures have poor adaptability, requiring frequent replacement or adjustment of the guide devices, which increases equipment debugging time and production costs. In addition, existing guide structures often have obvious geometric abrupt changes or sharp edges during the tension spring's entry process, causing the tension spring to be subjected to impact when passing through, which can easily cause deformation of the tension spring end or peeling of the surface coating, affecting the performance and appearance quality of the tension spring. Therefore, there is an urgent need for a tension spring assembly guide structure that can provide high-precision guidance, smooth transition, strong adaptability, and reliable structure to solve the above technical problems. Utility Model Content

[0003] In view of this, the present invention provides a guide structure for a tension spring assembly device, which can solve the technical problem that insufficient guiding accuracy during tension spring assembly makes it difficult for the tension spring to accurately enter the predetermined assembly position.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a guide structure for a tension spring assembly device, used to position and guide the tension spring during the assembly process. It includes a guide seat and a guide rod. The guide seat has a guide channel with an inlet flared structure and an outlet cylindrical through-hole structure. The guide rod has a tapered rod structure with its tapered end facing the inlet of the guide channel. The maximum outer diameter of the tapered end of the guide rod is smaller than the inner diameter of the cylindrical through-hole at the outlet of the guide channel. The axis of the guide rod coincides with the central axis of the guide channel.

[0006] The technical advantages of the guide structure of the tension spring assembly device provided by this utility model are as follows: Through the cooperation structure of the guide seat and the guide rod, and the gradual design of the guide channel from the flared opening to the cylindrical through hole, the tension spring can be gradually guided and accurately positioned during the assembly process. The tapered end structure of the guide rod and the flared opening structure at the entrance of the guide channel form a dual guiding mechanism, which effectively expands the fault tolerance range when the tension spring initially enters. At the same time, the coincidence design of the central axis of the guide rod and the guide channel ensures the axial stability of the tension spring throughout the guiding process, avoiding the phenomenon of skewing or jamming during the assembly of the tension spring, and significantly improving the success rate and assembly efficiency of tension spring assembly.

[0007] Based on the above technical solution, the guide structure of the tension spring assembly device of this utility model can be further improved as follows:

[0008] The flaring angle of the flared structure at the entrance end of the guide channel is 30°~45°.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by limiting the flaring angle of the flared structure at the entrance of the guide channel to the range of 30°~45°, it ensures that the guide entrance area is large enough to facilitate the rapid entry of the tension spring into the guide system, and avoids the problem of decreased guide accuracy caused by excessive flaring angle. This angle range allows the tension spring to be effectively captured and smoothly guided to the correct position when it approaches the guide channel from any angle, balancing the relationship between guide efficiency and guide accuracy, and ensuring the stability and reliability of the tension spring assembly process.

[0010] Furthermore, the cone angle of the tapered end of the guide rod is greater than the flaring angle of the flared structure at the entrance of the guide channel.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by making the cone angle of the tapered end of the guide rod greater than the flaring angle of the flared structure at the entrance of the guide channel, a progressive guide contraction mechanism is formed. The tension spring is first captured by the flared structure of the guide channel for initial positioning, and then precisely positioned again by the tapered end of the guide rod. This double-tapered design makes the radial constraint force on the tension spring gradually increase rather than suddenly increase during the guiding process, effectively reducing the impact and friction between the tension spring and the guide structure, reducing the risk of tension spring deformation and guide structure wear, and improving the smoothness of the guiding process and the service life of the guide structure.

[0012] Furthermore, the outer surface of the guide seat is provided with a plurality of reinforcing ribs, which are evenly distributed along the circumference of the guide seat and are in the form of radially extending plate-like structures.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting multiple radially extending plate-shaped reinforcing ribs evenly distributed along the circumference on the outer surface of the guide seat, the overall rigidity and deformation resistance of the guide seat structure are significantly enhanced. These reinforcing ribs effectively disperse the radial and axial forces generated during the assembly of the tension spring, preventing the guide seat from deforming or cracking due to stress concentration during long-term use. At the same time, the uniform distribution design of the reinforcing ribs ensures the balance of mechanical properties in all directions of the guide seat, avoids the occurrence of local weak points, and ensures that the guide channel maintains a precise geometric shape and stable guiding accuracy throughout the entire service life.

[0014] Furthermore, the guide rod has a smooth polished surface, and the tapered end of the guide rod is connected to the cylindrical connecting section by an arc transition surface.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by smoothing the surface of the guide rod and using an arc transition surface to connect the tapered end and the cylindrical connecting section, the micro-roughness and macro-geometric abrupt changes of the guide rod surface are eliminated, which greatly reduces the frictional resistance experienced by the tension spring when sliding along the guide rod. The smooth polished surface reduces the wear of the coating on the tension spring surface, and the arc transition surface design avoids the tension spring from getting stuck or scratching at the junction of the tapered and cylindrical sections, ensuring the continuity and smoothness of the tension spring guiding process. At the same time, it reduces noise and vibration during the guiding process, and improves assembly quality and operational comfort.

[0016] Furthermore, the inner wall surface of the flared structure of the guide channel is connected to the inner wall surface of the cylindrical through hole structure by a rounded transition surface, the radius of which is 2mm~5mm.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By setting a rounded transition surface with a radius of 2mm to 5mm between the inner wall surface of the flared structure of the guide channel and the inner wall surface of the cylindrical through hole structure, the sharp transition edge inside the guide channel is eliminated, which effectively prevents the impact and stress concentration caused by the geometric change when the tension spring enters the cylindrical through hole section from the flared section. The rounded transition surface makes the radial constraint force borne by the tension spring smoothly and gradually change rather than suddenly, reducing the risk of deformation or damage to the hook or coil at the end of the tension spring. At the same time, the presence of the rounded transition surface improves the stress distribution state inside the guide channel and improves the fatigue strength and reliability of the guide seat structure.

[0018] Furthermore, the bottom of the guide seat is provided with a mounting base plate, and the mounting base plate has multiple mounting holes. The mounting holes are circular and are evenly distributed along the edge of the mounting base plate.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By setting a mounting base plate with multiple evenly distributed circular mounting holes along the edge at the bottom of the guide seat, a stable and reliable installation foundation and flexible installation methods are provided for the guide structure. The even distribution of multiple mounting holes ensures the balanced force of the guide seat after installation, effectively disperses the force transmitted to the mounting surface during assembly, and prevents the guide seat from tilting or displacing. The design of the circular mounting holes facilitates quick installation and disassembly using standard bolts. At the same time, the mounting base plate increases the contact area between the guide seat and the mounting surface, improves the overall installation stability and vibration resistance of the guide structure, and ensures that the guiding accuracy is not affected by external interference.

[0020] Furthermore, the guide rod is made of stainless steel, and the guide seat is made of aluminum alloy.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by using stainless steel to make the guide rod and aluminum alloy to make the guide seat, the optimal match between the material properties of each component of the guide structure and the usage requirements is achieved. Stainless steel provides the guide rod with excellent surface hardness and wear resistance, ensuring that the guide rod maintains surface smoothness and dimensional accuracy during long-term contact and friction with the tension spring. Aluminum alloy provides the guide seat with a good strength-to-weight ratio and processing performance, reducing the overall weight while ensuring structural strength, making it easy to install and move. The reasonable combination of the two materials not only meets the functional requirements of the guide structure but also achieves the goals of cost optimization and lightweight design.

[0022] Furthermore, the outer diameter of the cylindrical connecting section of the guide rod remains constant along the axial direction, and the length of the tapered end of the guide rod is greater than the length of the cylindrical connecting section.

[0023] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by keeping the outer diameter of the cylindrical connecting section of the guide rod constant along the axial direction and making the length of the tapered end greater than the length of the cylindrical connecting section, a sufficiently long tapered guiding stroke and a stable cylindrical positioning stroke are provided for the tension spring. The longer tapered end ensures that the tension spring has sufficient distance to complete the guiding process from initial contact to precise alignment. The cylindrical connecting section with a constant outer diameter provides a reliable axial positioning reference for the tension spring. This length ratio design makes the guiding process divided into a clear guiding stage and a positioning stage, avoiding the problems of insufficient guidance or unstable positioning, and improving the consistency of the tension spring assembly position and the stability of the assembly quality.

[0024] Furthermore, the ratio of the length of the cylindrical through-hole structure of the guide channel to the thickness of the guide seat along the axial direction is 3:2 to 2:1, and the ratio of the minimum outer diameter of the tapered end of the guide rod to the outer diameter of the cylindrical connecting section is 1:3 to 1:2.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By limiting the ratio of the length of the cylindrical through-hole structure of the guide channel to the axial thickness of the guide seat to the range of 3:2 to 2:1, and limiting the ratio of the minimum outer diameter of the tapered end of the guide rod to the outer diameter of the cylindrical connecting section to the range of 1:3 to 1:2, a reasonable proportional relationship between the key dimensions of the guide structure is established. These proportional relationships ensure that the guide channel has sufficient guiding depth to provide stable support, while avoiding the increase in frictional resistance and processing difficulty caused by excessive channel length. The diameter ratio between the tapered end of the guide rod and the cylindrical section ensures that the tapered section has sufficient taper to achieve effective guidance while avoiding insufficient strength caused by excessive taper. The optimized design of these dimensional ratios enables the guide structure to achieve the best balance between guiding efficiency, structural strength and manufacturing.

[0026] Compared with existing technologies, the beneficial effects of the guide structure of the tension spring assembly device provided by this utility model are as follows: This utility model, through its structural design of a guide seat and guide rod working together, and its unique geometric shape of the guide channel gradually changing from a flared opening to a cylindrical through hole, combined with the precise positioning method of aligning the tapered end of the guide rod with the axis of the guide channel, fundamentally solves the problem of insufficient guide accuracy in tension spring assembly in existing technologies. This guide structure first utilizes the flared opening to provide a large area for capturing the tension spring, then gradually narrows the constraint range through the gradually changing channel geometry and the tapered guiding effect of the guide rod, ultimately precisely guiding the tension spring to the predetermined assembly position. The entire guiding process is smooth, continuous, and impact-free, effectively avoiding… This invention eliminates the problems of misalignment, jamming, and deformation damage during tension spring assembly, significantly improving the success rate and efficiency of tension spring assembly. Furthermore, through reasonable material selection and optimized structural design, the guide structure exhibits excellent wear resistance and service life. The design of reinforcing ribs and mounting base plate further enhances the stability and reliability of the structure. The application of rounded transition surfaces and smooth polished surfaces reduces frictional resistance and wear. Optimization of the proportional relationships between key dimensions achieves an optimal balance between guiding efficiency, structural strength, and manufacturing cost. Compared to existing technologies, this invention not only improves the precision and efficiency of tension spring assembly but also reduces the tension spring damage rate and equipment maintenance costs, demonstrating significant technological advancement and practical value. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A front view of the guide structure of a tension spring assembly device;

[0029] Figure 2 A cross-sectional view of the guide structure of a tension spring assembly device;

[0030] Figure 3 A top view of the guide structure of a tension spring assembly device;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Guide seat; 20. Guide rod; 21. Conical end; 22. Cylindrical connecting section; 30. Guide channel; 40. Mounting base plate. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figure 1-3 The diagram shows an embodiment of a guide structure for a tension spring assembly device provided by this utility model. In this embodiment, it is used to position and guide the tension spring during the assembly process. It includes a guide seat 10 and a guide rod 20. The guide seat is provided with a guide channel 30. The entrance end of the guide channel has a flared structure, and the exit end of the guide channel has a cylindrical through hole structure. The guide rod has a tapered rod structure. The tapered end 21 of the guide rod is set towards the entrance end of the guide channel. The maximum outer diameter of the tapered end of the guide rod is smaller than the inner diameter of the cylindrical through hole at the exit end of the guide channel. The axis of the guide rod coincides with the central axis of the guide channel.

[0035] In the above technical solution, the flaring angle of the flared structure at the entrance of the guide channel is 30°~45°.

[0036] Furthermore, in the above technical solution, the cone angle of the tapered end 21 of the guide rod is greater than the flaring angle of the flared structure at the entrance end of the guide channel.

[0037] Furthermore, in the above technical solution, the outer surface of the guide seat is provided with multiple reinforcing ribs, which are evenly distributed along the circumference of the guide seat and have a radially extending plate-like structure.

[0038] Furthermore, in the above technical solution, the surface of the guide rod has a smooth polished surface, and the tapered end of the guide rod is connected to the cylindrical connecting section 22 through an arc transition surface.

[0039] Furthermore, in the above technical solution, the inner wall surface of the flared structure of the guide channel and the inner wall surface of the cylindrical through hole structure are connected by a rounded transition surface, the radius of which is 2mm~5mm.

[0040] Furthermore, in the above technical solution, the bottom of the guide seat is provided with a mounting base plate 40, and the mounting base plate has multiple mounting holes with a circular structure, and the multiple mounting holes are evenly distributed along the edge of the mounting base plate.

[0041] Furthermore, in the above technical solution, the guide rod is made of stainless steel and the guide seat is made of aluminum alloy.

[0042] Furthermore, in the above technical solution, the outer diameter of the cylindrical connecting section of the guide rod remains constant along the axial direction, and the length of the tapered end of the guide rod is greater than the length of the cylindrical connecting section.

[0043] Furthermore, in the above technical solution, the ratio of the length of the cylindrical through-hole structure of the guide channel to the thickness of the guide seat along the axial direction is 3:2 to 2:1, and the ratio of the minimum outer diameter of the tapered end of the guide rod to the outer diameter of the cylindrical connecting section is 1:3 to 1:2.

[0044] First, the guide structure is bolted to the predetermined position on the tension spring assembly equipment through the mounting holes on the mounting base plate, ensuring that the guide seat is firmly installed and the axis of the guide rod is aligned with the assembly axis of the tension spring. After installation, check that the inside of the guide channel is clean and free of debris, and that the surface of the guide rod is smooth and free of scratches. At the start of the assembly operation, the operator or automatic feeding mechanism moves the tension spring to be assembled to the vicinity of the entrance end of the guide channel, so that the end hook or ring of the tension spring faces the direction of the flared opening. Due to the large entrance area and flaring angle of 30°~45° of the flared opening, the end of the tension spring can easily enter the capture area of ​​the guide channel. Then, an appropriate thrust is applied along the axial direction of the tension spring. Guided by the inclined surface of the flared opening, the tension spring automatically moves towards the center of the guide channel. As the tension spring continues to penetrate, its inner hole begins to connect with the tapered end of the guide rod. Upon contact, the tapered surface of the guide rod expands outwards, guiding the tension spring through its inner hole. Combined with the contraction of the guide channel from a trumpet shape to a cylinder, the tension spring quickly completes axial alignment and radial positioning. Continuing to advance the tension spring, it slides along the tapered end of the guide rod to the cylindrical connecting section. At this point, the tension spring is fully inserted into the cylindrical through-hole of the guide channel and precisely positioned at the predetermined assembly location. The entire guiding process is smooth, continuous, and without jamming. The operator then completes the assembly and connection of the tension spring with other components. After assembly, the assembled component is removed from the guide structure in the opposite direction. Because the guide rod surface is smooth and each transition surface uses a rounded corner design, the removal process is also smooth and resistance-free. For tension springs of different specifications, simply changing the guide structure according to the spring's dimensions allows for quick switching. The entire process is simple, efficient, and reliable.

[0045] The following is a specific embodiment 1 of this utility model: This embodiment provides a guide structure for assembling tension springs with a diameter of 8mm to 12mm. The guide seat is made of 6061 aluminum alloy and integrally formed by CNC machining center. The guide seat is in the shape of a cylindrical frustum. The outer diameter of the upper cylindrical section is 60mm and the height is 40mm. The lower part is a square mounting base plate with a side length of 80mm and a thickness of 10mm. The guide channel runs through the guide seat axially. The flared structure at the entrance of the guide channel is made of conical surface and the flaring angle is 38°. The maximum inner diameter of the flared section is 30mm and the minimum inner diameter is 14mm. The axial length of the flared section is 1. The guide channel has a cylindrical through-hole with an inner diameter of 13mm and an axial length of 25mm. The inner wall of the flared opening is connected to the inner wall of the cylindrical through-hole by a 3mm radius fillet transition surface. This fillet transition surface is precision machined with a ball end mill to ensure a smooth, stepless transition. Four reinforcing ribs are evenly distributed circumferentially on the outer surface of the guide seat. Each reinforcing rib has a radially extending rectangular plate structure with a radial height of 8mm, a thickness of 5mm, and an axial length of 35mm. A 9mm diameter circular mounting hole is opened at each of the four corners of the mounting base plate, with the center of the mounting hole 20mm from the edge of the base plate. The guide rod is made of 304 stainless steel and machined... The guide rod is machined and shaped with a total length of 50mm, a tapered end length of 30mm, a tapered angle of 50°, a minimum outer diameter of 4mm, and a maximum outer diameter (i.e., the outer diameter of the cylindrical connecting section) of 12mm. The cylindrical connecting section is 20mm long. The tapered end and the cylindrical connecting section are connected by a 2mm radius arc transition surface. The guide rod surface is precision machined and then polished to a surface roughness of Ra 0.4 micrometers. The guide rod is pressed into the positioning hole at the bottom of the guide seat through an interference fit. The positioning hole depth is 15mm. After pressing, the tapered end of the guide rod extends into the guide channel, with the apex of the tapered end 5mm away from the surface of the flared inlet end. The coaxiality deviation between the axis of the guide and the center axis of the guide channel is controlled within 0.02mm. During use, the guide structure is fixed to the assembly workbench with M8 bolts. The tension spring is inserted from the flared end. Under the dual guidance of the guide channel and the guide rod, the tension spring can quickly and accurately complete axial alignment and positioning. The entire guiding process is smooth and without jamming. The assembly success rate of the tension spring is increased to over 98%, the assembly time is shortened by 40%, and the deformation rate of the tension spring end is reduced to below 1%. After 100,000 assembly cycles of continuous use, the guide channel and guide rod surfaces still maintain a good condition with no obvious wear or dimensional changes, and the guiding accuracy remains stable.

[0046] The following is another specific embodiment 2 of this utility model: This embodiment 2 is an improvement on embodiment 1, designed for the assembly needs of larger-sized tension springs. It is suitable for assembling tension springs with diameters of 15mm to 20mm. The outer diameter of the upper cylindrical section of the guide seat is increased to 80mm, and the height is increased to 50mm. The side length of the mounting base plate is enlarged to 100mm. The maximum inner diameter of the flared guide channel is increased to 45mm, and the minimum inner diameter is 22mm. The inner diameter of the cylindrical through hole is enlarged to 21mm. The outer diameter of the cylindrical connecting section of the guide rod is increased to 20mm, and the minimum outer diameter of the tapered end is increased to 7mm. This is to enhance the large-sized guide structure. The rigidity has been improved, with the number of reinforcing ribs increased to 6 and the radial height and thickness of each rib increased to 12mm and 7mm respectively. At the same time, an annular reinforcing ring structure has been added around the guide channel inside the guide seat. This annular reinforcing ring is located on the outside of the cylindrical through hole section of the guide channel and has a thickness of 8mm. This effectively improves the guide channel's resistance to deformation when subjected to the assembly force of large-sized tension springs. The connection between the guide rod and the guide seat has been changed to a threaded connection, which facilitates quick replacement of the guide rod according to different tension spring specifications. This improved guide structure exhibits excellent guiding stability and structural reliability when handling large-sized tension springs, meeting the requirements for use under heavy-load conditions.

[0047] The following is another specific embodiment 3 of this utility model: This embodiment 3 is an optimization and improvement based on embodiment 1, specifically for the application scenario of high-speed automated assembly lines. A vibration damping ring is added to the flared inlet end of the guide seat. This vibration damping ring is made of rubber material and is fixed to the edge of the flared inlet by a slot. It has a thickness of 3mm and is used to absorb the impact vibration generated by the collision between the tension spring and the guide structure during high-speed feeding, thereby reducing noise and protecting the guide structure. At the same time, a titanium nitride coating with a thickness of 0.05mm is coated on the tapered end surface of the guide rod. This coating has extremely high surface hardness and extremely low friction. The coefficient further enhances the wear resistance and friction reduction of the guide rod, enabling it to adapt to high-speed assembly frequencies of over 200 times per minute. In addition, a guide limiting step with a height of 2mm is added to the cylindrical through-hole outlet end of the guide channel to precisely control the assembly depth of the tension spring and prevent it from overshooting due to inertia during high-speed assembly. These optimizations and improvements for high-speed automated applications enable the guide structure to maintain high-precision guiding performance while possessing stronger impact resistance, wear resistance, and position control capabilities, meeting the stringent requirements of modern production lines for high efficiency and high reliability of assembly equipment.

[0048] Specifically, the principle of this utility model is as follows: This utility model uses the technical principle of a progressive dual-guiding mechanism formed by the cooperation of a guide seat and a guide rod to solve the core technical problem of insufficient guiding accuracy in tension spring assembly. The basis of this technical principle lies in the synergistic effect of the gradual geometric shape of the guide channel from a flared opening to a cylindrical through hole and the conical end structure of the guide rod. When the tension spring approaches the guide structure, the flared opening, with its large entrance area and inclined inner wall surface, forms the first-level guiding capture area. No matter what angle the tension spring approaches from, it can be guided by the inclined surface of the flared opening and gradually move towards the central axis of the guide channel. The reasonable setting of the flared opening angle ensures a sufficient capture range while avoiding excessive dispersion of the guiding force. As the tension spring goes deeper into the guide channel, the flared opening gradually transitions to a cylindrical through hole. This gradual process makes the radial constraint force on the tension spring increase smoothly, avoiding the sudden geometric changes that could lead to... The impact is mitigated by the tapered end of the guide rod, which acts as a secondary guiding mechanism. The tapered angle of the guide rod's tapered end is greater than the flaring angle of the guide channel, allowing the tension spring to be constrained by the contraction of the guide channel while its inner hole is guided by the outward expansion of the tapered surface of the guide rod. This coordinated internal and external guiding force enables the tension spring to quickly and accurately find the correct axial position. The precise alignment of the guide rod and the guide channel's central axis ensures the coaxiality of the entire guiding process, avoiding assembly errors caused by eccentricity. The application of rounded transition surfaces eliminates stress concentration points, the smooth polished surface reduces frictional resistance, and the reinforcing ribs enhance structural rigidity and prevent deformation. The combined effect of these technical features ensures that the tension spring remains under control throughout the guiding process, smoothly and continuously transitioning from the initial contact position to the final assembly position. This fundamentally solves the core technical problem of insufficient guiding accuracy in existing technologies.

[0049] 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 scope of the claims.

Claims

1. A guide structure for a tension spring assembly device, used to position and guide the tension spring during the assembly process, comprising a guide seat and a guide rod, wherein the guide seat is provided with a guide channel, the inlet end of the guide channel is a flared structure in the shape of a trumpet, the outlet end of the guide channel is a cylindrical through hole structure, the guide rod is a tapered rod structure, the tapered end of the guide rod is positioned facing the inlet end of the guide channel, the maximum outer diameter of the tapered end of the guide rod is smaller than the inner diameter of the cylindrical through hole at the outlet end of the guide channel, and the axis of the guide rod coincides with the central axis of the guide channel.

2. The guide structure of the tension spring assembly device according to claim 1, characterized in that, The flaring angle of the flared structure at the entrance of the guide channel is 30°~45°.

3. The guide structure of the tension spring assembly device according to claim 2, characterized in that, The cone angle of the tapered end of the guide rod is greater than the flare angle of the flared structure at the entrance of the guide channel.

4. The guide structure of the tension spring assembly device according to claim 3, characterized in that, The outer surface of the guide seat is provided with a plurality of reinforcing ribs, which are evenly distributed along the circumference of the guide seat and are in the form of radially extending plate-like structures.

5. The guide structure of the tension spring assembly device according to claim 4, characterized in that, The guide rod has a smooth polished surface, and the tapered end of the guide rod is connected to the cylindrical connecting section by an arc transition surface.

6. The guide structure of the tension spring assembly device according to claim 5, characterized in that, The inner wall surface of the flared structure of the guide channel is connected to the inner wall surface of the cylindrical through hole structure by a rounded transition surface, the radius of which is 2mm~5mm.

7. The guide structure of the tension spring assembly device according to claim 6, characterized in that, The bottom of the guide seat is provided with a mounting base plate, and the mounting base plate has multiple mounting holes. The mounting holes are circular and are evenly distributed along the edge of the mounting base plate.

8. The guide structure of the tension spring assembly device according to claim 7, characterized in that, The guide rod is made of stainless steel, and the guide seat is made of aluminum alloy.

9. The guide structure of the tension spring assembly device according to claim 8, characterized in that, The outer diameter of the cylindrical connecting section of the guide rod remains constant along the axial direction, and the length of the tapered end of the guide rod is greater than the length of the cylindrical connecting section.

10. The guide structure of the tension spring assembly device according to claim 9, characterized in that, The ratio of the length of the cylindrical through-hole structure of the guide channel to the thickness of the guide seat along the axial direction is 3:2 to 2:1, and the ratio of the minimum outer diameter of the tapered end of the guide rod to the outer diameter of the cylindrical connecting section is 1:3 to 1:2.

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