A spike for puncturing a tire blank for tire manufacture

Abstract

A tire manufacturing puncture-proof tire blank spike is characterized in that it comprises a handle, a sheath and a spike, one end of the spike is a pointed end, the other end is fixedly connected with a screw rod, the spike and the screw rod are penetrated into the hollow sheath, are threadedly connected with the end of the sheath, the pointed end of the spike can be extended out of the sheath, a filler is arranged between the spike and the sheath, the end face of the end of the sheath close to the pointed end of the spike is an inclined face, the inclination angle of the inclined face is adapted to the inclination angle of the tire surface to be punctured, the end of the sheath away from the pointed end of the spike is extended into the handle, and the side of the handle is provided with a top screw for fixing the sheath. The end face of the sheath is arranged as an inclined face with a certain inclination angle, the inclined face of the end face of the sheath is closely attached to the surface of the punctured tire blank when the worker punctures the tire blank obliquely, the tire blank is avoided from being mistakenly penetrated, the oblique puncture can improve the exhaust effect and the operation convenience, the tire blank forming quality and consistency are improved, the air leakage risk of the finished tire is reduced, and the safety and reliability of the tire use are ensured.

Description

Technical Field

[0001] This utility model belongs to the field of tire manufacturing auxiliary tools, specifically relating to an awl for preventing punctures in tire blanks during tire manufacturing. Background Technology

[0002] In tire manufacturing, tire blank forming is a crucial process, as its quality directly impacts the performance and safety of the final tire. Tire blanks are typically composed of multiple layers of rubber, plywood, and steel wires laminated together. During lamination, air bubbles or gaps can easily form between the layers due to residual air. If these are not promptly removed, problems such as localized rubber defects, delamination, or insufficient strength may occur after tire vulcanization. Therefore, puncturing and venting the tire blank is a necessary step in the forming process—operators use a specialized tool (a traditional awl) to puncture small holes at specific locations on the tire blank surface. External force is then applied to expel air from the interlayers through these holes, followed by subsequent rolling or lamination operations to ensure a tight bond between the layers.

[0003] Traditional tire blank puncture operations primarily rely on ordinary metal awls (such as steel or carbide awls), which consist of a single sharp needle with no protective design and uncontrollable penetration depth. In practice, operators must rely on experience to judge the puncture force and depth: firstly, the tire blank is composed of multiple materials of varying thicknesses, with significant differences in the total thickness between layers at different locations; secondly, operators' skill levels vary, and the fast production pace and high labor intensity make it easy for excessive force or angle deviation to cause the awl to penetrate too deeply, directly piercing the outermost rubber protective layer of the tire blank, and even damaging the internal ply layer or steel wire structure. More seriously, once the awl punctures the tire blank, it leaves a penetrating hole in the rubber layer. Although subsequent processes may temporarily seal the hole through rolling, the high temperature and pressure environment during vulcanization causes the rubber molecular chains to rearrange, and the stress concentration area around the penetrating hole is difficult to completely repair, ultimately forming a hidden defect inside the finished tire. Such defects can cause the pores to expand due to changes in internal air pressure or external impacts during tire use (especially at high speeds or under heavy loads), leading to slow air leakage (manifested as slow tire deflator). In severe cases, it can even cause sudden loss of tire pressure, threatening driving safety.

[0004] Furthermore, the fixed, sharp structure of traditional awls lacks guiding and limiting functions, requiring complete manual control of the insertion angle during operation, further increasing the difficulty of operation and the risk of misoperation. Although some companies have attempted to improve the situation through training or by adding simple limiting blocks, the effects have been limited and the problem of puncture has not been fundamentally solved.

[0005] Chinese Patent Publication No. CN219006314U discloses an eye-piercing tool, including a connecting handle, an adjusting component, and an eye-piercing needle. The connecting handle has a movable hole, and at least one end of the movable hole extends to one end face of the connecting handle along its length. The eye-piercing needle is located within the movable hole and can be connected to the adjusting component. The adjusting component drives the eye-piercing needle to extend or retract within the movable hole along its length and can fix the relative position of the eye-piercing needle and the connecting handle. An marking portion is provided on the eye-piercing needle or the connecting handle to indicate the length of the eye-piercing needle extending beyond the movable hole. While the eye-piercing tool provided by this invention facilitates accurate adjustment of the eye-piercing depth by providing the marking portion, the eye-piercing needle's extension and retraction within the movable hole creates a gap between the needle and the wall of the movable hole, causing the needle to wobble during operation and affecting the eye-piercing effect. In addition, since the end face of the connecting handle is used to contact the object being punctured for limiting, as can be seen from the figure, the end face of the connecting handle is flat. Therefore, to ensure the puncture depth, the puncture needle must be inserted straight into the tire bead or tire shoulder. If it is inserted at an angle, it is difficult to ensure the puncture depth. If the puncture needle is inserted straight into the tire bead or tire shoulder, it can only puncture the air bubbles in a straight line, and the air venting effect is generally poor.

[0006] In response to the actual need for venting air from punctures in the tire manufacturing process, there is an urgent need for a special awl that can prevent punctures to the tire blank and has a better venting effect. Summary of the Invention

[0007] To address the aforementioned problems in the existing technology, this utility model provides an awl for preventing punctures in tire blanks during tire manufacturing. Using this awl can improve the air venting effect and effectively solve the problem of tire leakage caused by punctures.

[0008] The objective of this utility model is achieved by the following means: A puncture-resistant awl for tire manufacturing, characterized in that: it includes a handle, a sheath and a needle, one end of the needle is a tip and the other end is fixedly connected to a screw, the needle and the screw are inserted into the hollow sheath together and are threaded to the end of the sheath, the tip of the needle can extend out of the sheath, a filler is provided between the needle and the sheath, the end face of the sheath near the tip of the needle is a bevel, the inclination angle of the bevel is adapted to the inclination angle of the tire tread to be punctured, the end of the sheath away from the tip of the needle extends into the handle (1), and a set screw for fixing the sheath is provided on the side of the handle.

[0009] The bevel angle of the end face of the sheath is 30~45°.

[0010] The junction between the beveled surface of the sheath and the outer circumference of the sheath is rounded.

[0011] The handle is made of nylon.

[0012] The sheath is made of aluminum alloy.

[0013] The filler is nylon.

[0014] Compared to existing technologies, this invention optimizes the structure of existing awls by setting the end face of the sheath as a slope with a certain angle. When workers puncture the tire blank at an angle, the slope of the end face of the sheath is in close contact with the surface of the tire blank being punctured, avoiding accidental puncture of the tire blank. At the same time, the angled puncture can improve the air release effect and the ease of operation, improve the tire blank forming quality and consistency, reduce the risk of air leakage in the finished tire, and ensure the safety and reliability of tire use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is the appearance drawing of this utility model.

[0017] Figure 3 This is a partial view of the present invention. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the contents of the present invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present invention.

[0019] like Figures 1-3 As shown, an awl for preventing punctures in tire manufacturing includes a handle 1, a sheath 2, and a puncture needle 3. One end of the puncture needle 3 is a pointed tip, and the other end is fixedly connected to a screw 5. The puncture needle 3 and the screw 5 are inserted into the hollow sheath 2 and threaded to the end of the sheath 2. The tip of the puncture needle 3 can extend out of the sheath 2. A filler 6 is provided between the puncture needle 3 and the sheath 2. The end face of the sheath near the tip of the puncture needle is a bevel, and the inclination angle of the bevel is adapted to the inclination angle of the tire tread to be punctured. The inclination angle α of the end face of the sheath is preferably 30~45°. The end of the sheath away from the tip of the puncture needle extends into the handle 1, and a set screw 4 for fixing the sheath is provided on the side of the handle.

[0020] The needle 3 and screw 5 are inserted together into the hollow sheath 2 and threadedly connected to the end of the sheath 2. Specifically, a nut 7 can be installed at the end of the sheath 2, and the screw 5 can be threadedly connected to the nut. The extension length of the needle 3 within the sheath 2 can be adjusted by turning the screw 5; this extension length can be adjusted according to the thickness of the tire blank material. To adjust the extension length of the needle 3, first unscrew the set screw 4 that secures the sheath on the side of the handle, remove the handle, adjust the needle 3, and then insert the end of the sheath 2 containing the needle 3 and screw 5 into the handle, securing the sheath with the set screw 4. To improve the locking effect, two set screws 4 can be symmetrically installed on the side of the handle.

[0021] Handle 1 is for the operator to grip and is the handheld part of the entire awl. The rear end of the sheath 2 is inserted into the handle and fixed with a set screw to prevent movement of the needle and sheath during puncture operations. The front end of the sheath 2 is designed with a 30-45° bevel, which is in close contact with the surface of the tire blank to be punctured (the tire blank surface is beveled), making it easier for the worker to insert the needle at an angle into the tire blank, avoiding accidental puncture and ensuring air release effect. The puncture area of ​​the needle inserted at an angle into the tire blank is larger than that of a straight puncture, which can puncture air bubbles in a larger area and achieve better air release effect. The needle 3 is located inside the sheath, and the needle body is filled and fixed with filler material 6 to stabilize the position of the needle 3 and prevent it from shaking or deviating inside the sheath 2. The length of the needle tip extending out of the sheath can be adjusted by the threaded screw at the tail end to precisely control the puncture depth.

[0022] The handle 1 is preferably made of nylon, the sheath 2 is preferably made of lightweight and corrosion-resistant aluminum alloy, and the filler 6 is preferably made of nylon, which has excellent wear resistance and ultra-high toughness.

[0023] The front end of the sheath 2 is designed with a bevel. Workers must puncture the tire at the bevel angle of the front end of the sheath 2 to ensure it is in complete contact with the surface of the tire, guaranteeing the needle penetrates fully into the tire and achieves the intended puncture depth. Therefore, the beveled design of the front end of the sheath 2 also helps to standardize worker procedures.

[0024] If the worker does not puncture according to the bevel angle at the front end of the sheath 2, the bevel tip will touch the surface of the tire blank, scratching the surface of the green tire, and failing to achieve the required puncture depth and effect. To avoid the bevel tip scratching the surface of the green tire, the junction between the bevel of the sheath and the outer circumference of the sheath is rounded.

[0025] This invention optimizes the structure of existing awls, limiting the piercing depth. The end face of the sheath is set as a slope with a certain angle. When the worker pierces the tire blank at an angle, the slope of the end face of the sheath is in close contact with the surface of the tire blank being pierced, avoiding accidental piercing of the tire blank. At the same time, the angled piercing can improve the air release effect and the ease of operation, improve the tire blank forming quality and consistency, reduce the risk of air leakage of finished tires, and ensure the safety and reliability of tire use.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. An awl for preventing punctures in tire blanks during tire manufacturing, characterized in that: Includes a handle (1), a sheath (2) and a needle (3). One end of the needle (3) is a pointed tip, and the other end is fixedly connected to a screw (5). The needle (3) and the screw (5) are inserted into the hollow sheath (2) and threaded to the end of the sheath (2). The tip of the needle (3) can extend out of the sheath (2). Filler (6) is provided between the needle (3) and the sheath (2). The end face of the sheath near the tip of the needle is a bevel. The angle of the bevel is adapted to the angle of the tire tread to be punctured. The end of the sheath away from the tip of the needle extends into the handle (1). A set screw (4) for fixing the sheath is provided on the side of the handle.

2. The awl for puncture-resistant tire blanks in tire manufacturing according to claim 1, characterized in that: The bevel angle of the end face of the sheath is 30~45°.

3. The awl for puncture-resistant tire blanks in tire manufacturing according to claim 1 or 2, characterized in that: The junction between the beveled surface of the sheath and the outer circumference of the sheath is rounded.

4. The awl for puncture-resistant tire blanks in tire manufacturing according to claim 1, characterized in that: The handle (1) is made of nylon.

5. The awl for puncture-resistant tire blanks in tire manufacturing according to claim 1, characterized in that: The sheath (2) is made of aluminum alloy.

6. The awl for puncture-resistant tire blanks in tire manufacturing according to claim 1, characterized in that: The filler (6) is nylon.

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