A drawing and expanding tire builder

Abstract

The utility model discloses a kind of tire drawing and expanding type tire building machines, belong to hub assembly technical field.The device includes work platform, expansion die core and pulling device.Work platform middle part is equipped with hole;Expansion die core movably penetrates hole, its outer surface is the annular guide surface that gradually shrinks from top to bottom, and the inner side of upper end forms hub placement end surface;Pulling device is set below work platform, and its power output end is detachably connected with expansion die core lower part.The utility model is pulled expansion die core downwards, utilizes its gradually shrinks annular guide surface to make tire steady, evenly radially expansion, make tire automatically set on hub under the action of its own resilience, replace the traditional laborious and easily damaged product manual operation, with easy operation, time-saving and labor-saving, assembly efficiency is high, product yield is good and strong universality and other outstanding advantages.

Description

Technical Field

[0001] This utility model belongs to the field of wheel hub assembly technology, and in particular relates to a stretching type tire mount. Background Technology

[0002] With the booming development of the electric bicycle industry, the market has placed higher demands on the efficiency and automation level of wheel hub production. Among these demands, assembling the tire onto the wheel hub (commonly known as "tire installation") is one of the key processes in wheel hub assembly production. Currently, this process still heavily relies on traditional manual labor in many production scenarios. Operators use simple tools such as pry bars, relying on experience and physical strength to forcibly pry the tire bead into the rim groove of the wheel hub. This operational mode constitutes a bottleneck for accelerating production lines and automating their transformation, making it difficult to adapt to the needs of modern large-scale production.

[0003] The aforementioned traditional manual operation methods have many inherent drawbacks. First, their automation level is extremely low, relying entirely on manpower, resulting in low production efficiency and high labor intensity, which has become a key factor restricting capacity improvement. Second, during the rough prying process, hard tools can easily scratch the tire bead or the paint and coating of the wheel rim, causing damage to the product's appearance and even potential internal structural problems, directly affecting product yield and quality. Furthermore, this process demands high skill and physical strength from the operators, making it difficult to maintain consistent assembly quality and posing a certain risk of workplace injuries. Although some semi-automated tire mounting equipment exists on the market, it is often complex in structure, expensive, or fails to fundamentally optimize the core "tire expansion-mounting" action principle, thus its applicability and economy remain significantly limited. Therefore, there is an urgent need in this field for a wheel rim tire mounting device that is structurally sound, easy to operate, and can significantly improve assembly efficiency and quality. Utility Model Content

[0004] In view of the problems of low automation, reliance on manual labor, low assembly efficiency, easy damage to products and unstable assembly quality in existing technologies, this utility model provides a stretching and spreading type upper parting device.

[0005] This utility model is implemented as follows: a tire expander for mounting a tire onto a wheel hub, characterized by comprising a working platform, an expander core, and a pulling device; the working platform has a horizontal work surface with a central hole allowing the expander core to pass through; the expander core movably passes through the hole, its outer surface forming a tapering annular guide surface from top to bottom, and the inner side of the upper end of the expander core forming a hub placement end face for supporting the wheel hub; when the wheel hub is placed on the hub placement end face, the upper outer periphery of the expander core is used to expand the tire; the pulling device is located below the working platform, and its power output end is detachably connected to the lower part of the expander core, for providing a downward pulling force to the expander core.

[0006] In the above technical solution, preferably, the upper part of the expansion mold core is provided with a vertical circumferential section of equal diameter.

[0007] In the above technical solution, preferably, the annular guide surface is an inverted conical surface.

[0008] In the above technical solution, preferably, the pulling device is a manual scissor jack.

[0009] In the above technical solution, preferably, the pulling device is connected to the expansion mold core through a plug-in quick-release connector assembly.

[0010] In the above technical solution, preferably, the pulling device is fixed to the bottom of the work platform by a mounting bracket.

[0011] Compared to existing technologies, this tire expansion type assembly machine represents a significant advancement and offers substantial practical value. Its core advantage lies in its ingenious utilization of the gradually contracting annular guide surface of the expansion mold core and the downward linear pulling motion. This transforms the traditional, laborious, and unstable radial prying operation into a smooth and controllable vertical unidirectional stroke. This fundamentally simplifies operation and efficiently transmits force, allowing a single person to easily complete the heavy manual labor that previously required multiple people, greatly improving assembly efficiency and reducing labor intensity. In particular, the uniform-diameter circumferential portion on the upper part of the expansion mold core provides stable and uniform pre-expansion before the tire is removed, ensuring that the tire's inner diameter is always larger than the rim's outer diameter. This design guarantees that the tire, under its own recoil elasticity, can be accurately and smoothly fitted onto the rim, effectively avoiding problems such as tire damage, jamming, or rim paint scratches caused by uneven force in traditional operations. This significantly improves the first-time success rate of assembly and the product yield. In addition, the use of plug-in quick-release connectors to connect the expansion mold core and the pulling device allows the operation of changing different specifications of mold cores to adapt to various models of wheel hubs to be completed by hand in a few seconds without any tools, which greatly enhances the versatility of the equipment and the flexibility of the production line.

[0012] In summary, this utility model combines high efficiency, labor saving, stability, versatility and reliability, and comprehensively solves all the pain points of the traditional tire mounting process. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a diagram showing the usage state of this utility model; Figure 3 This is a schematic diagram of the upper end of the expansion mold core of this utility model. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0015] To overcome the shortcomings of existing technologies, this utility model provides a stretching-type tire attaching device. To further illustrate the structure of this utility model, a detailed description is provided below in conjunction with the accompanying drawings: Please see Figures 1-3 The core components of this tire expander include a working platform 1 that provides a stable assembly reference, an expander core 2 that performs the key tire expansion action, and a pulling device 3 that provides power. The working platform 1 has a horizontal surface with a hole in the center. The size of this hole is specially designed so that its diameter is larger than the maximum outer diameter of the expander core 2 but smaller than the inner diameter of the tire bead, thus ensuring that the expander core 2 can pass smoothly from top to bottom while providing effective support for the tire placed on it.

[0016] The expansion mold core 2, as the core functional component of this device, has an outer surface constructed as a gradually tapering annular guide surface from top to bottom. In a preferred embodiment, this annular guide surface is specifically an inverted conical surface. The upper inner side of the expansion mold core 2 extends inward to form a stepped or annular hub placement end face, used to support the hub during assembly. The key to its design is that when the hub is placed on this end face, the upper outer circumference of the expansion mold core 2 can precisely intersect between the tire and the hub, providing space for subsequent expansion actions. To optimize the expansion process, a vertical, equal-diameter circular section is specially provided on the upper part of the expansion mold core 2. This design brings unexpected technical benefits: during the pulling process, the equal diameter section can perform a stable and uniform pre-expansion of the tire, so that its inner diameter is reliably expanded and maintained at a constant value. This ensures that at the moment the tire separates from the mold core, its retraction path is highly consistent with the outer edge of the wheel hub, which significantly reduces the risk of the tire getting stuck or damaged due to local stress concentration or uneven rebound, and greatly improves the success rate and stability of the first assembly.

[0017] The pulling device 3 is fixed to the bottom of the work platform 1 by a sturdy mounting bracket 5, with its power output end extending upwards. This power output end is detachably connected to the lower part of the expansion mold core 2. In this embodiment, a plug-in quick-release connector assembly 4 is preferably used for this connection. This quick-release connector assembly 4 is a component that can be constructed using existing technology (e.g., a PC4 series pneumatic quick-connect connector). Specifically, it consists of a plug located at the lower end of the expansion mold core 2 and a socket located on the power output end of the pulling device 3. The socket is equipped with a quick-opening and closing latch. This connection method significantly improves operational efficiency: it allows operators to complete disassembly and assembly within seconds without using any tools when changing expansion mold cores of different specifications to fit various wheel models, achieving rapid production changeover. This is a practical breakthrough for flexible operations on the production line.

[0018] The working process of this invention is as follows: The operator first places the tire 6 flat on the work platform 1, aligning its tire cavity with the platform hole; then, the expansion mold core 2 is passed through the tire from top to bottom, so that its lower end passes through the platform hole and is quickly connected to the pulling device 3 below via the quick-release connector assembly 4; next, the wheel hub 7 is securely placed on the wheel hub placement end face at the upper end of the expansion mold core 2; the pulling device 3 is activated (e.g., manually operated scissor jack), and its power output end continues to move downward, pulling the expansion mold core 2 downward synchronously; during this process, the tire bead, limited by the edge of the platform hole, interacts with the gradually shrinking annular guide surface and the equal-diameter circumferential part of the expansion mold core 2 from top to bottom, and is uniformly and controllably radially expanded; when the tire is expanded to the point where its inner diameter is larger than the outer diameter of the wheel hub, and moves to the moment when it detaches from the upper end of the expansion mold core 2, the tire, under the strong recoil elasticity of its own rubber material, will quickly and accurately rebound and tightly fit onto the wheel hub, thus completing the assembly.

[0019] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tire-expanding type tire mounter for mounting a tire onto a wheel hub, characterized in that, include: The working platform (1) has a horizontal work surface, and the middle part is provided with a hole that allows the expansion mold core to pass through; The expansion mold core (2) is movably penetrating the hole, and its outer surface forms an annular guide surface that gradually shrinks from top to bottom. The inner side of the upper end of the expansion mold core (2) forms a hub placement end face for supporting the hub. When the hub is placed on the hub placement end face, the upper outer periphery of the expansion mold core (2) is used to expand the tire. Pulling device (3) is located below the working platform (1), and its power output end is detachably connected to the lower part of the expansion mold core (2) to provide downward pulling force to the expansion mold core (2).

2. The stretching-type tire-mounting device according to claim 1, characterized in that, The upper part of the expansion mold core (2) is provided with a vertical circumferential section of equal diameter.

3. The stretching-type tire-mounting device according to claim 1, characterized in that, The annular guide surface is an inverted conical surface.

4. The stretching-type tire-mounting device according to claim 1, characterized in that, The pulling device (3) is a manual scissor jack.

5. The stretching-type tire-mounting device according to claim 1, characterized in that, The pulling device (3) is connected to the expansion mold core (2) via a plug-in quick-release connector assembly (4).

6. The stretching-type tire-mounting device according to claim 1, characterized in that, The pulling device (3) is fixed to the bottom of the working platform (1) by the mounting bracket (5).

Images