Forming machine joint double pressure roller joint stapler

Abstract

The utility model discloses a kind of forming machine joint double-pressing roller joint staplers, including rack and first pressing mechanism and second pressing mechanism being installed in parallel on rack. First pressing mechanism is made of first shaft, multiple first independent roll pieces of independent float and first elastic support component;Second pressing mechanism is made of second shaft, multiple second independent roll pieces of independent float and second elastic support component;The roll piece of two pressing mechanisms is staggered arrangement, and completely eliminates pressing blind area.Each roll piece can adapt to fit forming camber, ensure that the pressure of tire joint area is evenly distributed, effectively solve the material slip, joint warping and pressing not real etc. Quality problems existing in traditional single-pressing roller.

Description

Technical Field

[0001] This utility model relates to the field of tire manufacturing machinery technology, specifically to a joint double pressure roller joint sewing machine for tire forming process. Background Technology

[0002] In the molding process of semi-steel radial tires, the pressing quality of the tire joint area is crucial to the performance of the finished tire. Traditional joint pressing processes generally use a single pressure roller structure, specifically the multi-plate rollers described in CN213006682U. Due to the physical gaps between the rollers, when the beveled cut surface of thin materials such as the inner liner falls precisely at the gap, it can lead to incomplete pressing in that area, resulting in serious quality defects such as joint lifting, spray fluid residue, and eventual separation (OJS). Traditional single-stage high-pressure pressing methods, if high pressure is applied directly, can easily cause the soft inner liner material to slip or twist; if the pressure is insufficient, the bonding strength of the joint cannot be guaranteed. This one-press shaping process cannot meet the gradient pressure requirements of the joint area, which requires precise positioning followed by strong compaction. Integral pressure rollers cannot effectively conform to the curved surface of the molding drum and the uneven surface caused by the superposition of multiple materials, resulting in uneven pressure distribution and problems such as uneven sidewall thickness (TG). Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a double pressure roller joint sewing device for forming machine joints, including:

[0004] frame;

[0005] The first pressing mechanism and the second pressing mechanism are mounted on the frame in parallel and side by side;

[0006] The first pressing mechanism includes a first shaft, a plurality of first independent rollers, and a first elastic support assembly; the plurality of first independent rollers are rotatably mounted on the outside of the first shaft and arranged close together along the axial direction, with a first gap formed between adjacent first independent rollers; a first floating space is formed between the first independent rollers and the first shaft, and the first elastic support assembly is disposed in the first floating space, so that each first independent roller can float up and down independently relative to the first shaft;

[0007] The second pressing mechanism includes a second shaft, a plurality of second independent rollers, and a second elastic support assembly; the plurality of second independent rollers are rotatably mounted on the second shaft and arranged close together along the axial direction, with a second gap formed between adjacent second independent rollers; a second floating space is formed between the second independent rollers and the second shaft, and the second elastic support assembly is disposed in the second floating space, so that each second independent roller can float up and down independently relative to the second shaft.

[0008] In some embodiments, the rollers of the first pressing mechanism and the second pressing mechanism are staggered in the axial direction, such that the axial projection of the second independent roller covers the first gap, and the axial projection of the first independent roller covers the second gap.

[0009] In some embodiments, the staggered arrangement is half the width of a roller.

[0010] In some embodiments, the suture device includes a pressure control device for controlling the pressure of the first pressing mechanism and the second pressing mechanism.

[0011] In some embodiments, the pressure control device includes a first pressure preset component and a second pressure preset component, which are respectively used to adjust the pressing pressure of the first pressing mechanism and the second pressing mechanism.

[0012] In some embodiments, both the first pressure preset component and the second pressure preset component include a cylinder and a proportional valve, and the piston rod of the drive cylinder is adapted to be connected to the first pressing mechanism and the second pressure mechanism.

[0013] In some embodiments, the first elastic support component includes a sponge, and the second elastic support component includes a spring.

[0014] In some embodiments, the first support assembly further includes an auxiliary compression spring disposed between the square shaft and the frame.

[0015] Another objective of this embodiment is to provide a double-roller joint sewing device for a forming machine joint, comprising a frame, a first pressing mechanism, and a second pressing mechanism. The first pressing mechanism and the second pressing mechanism are mounted parallel to and side-by-side on the frame. The first pressing mechanism includes a first shaft and a plurality of first independent rollers. The plurality of first independent rollers are rotatably mounted on the first shaft and arranged adjacent to each other along the axial direction, with a first gap formed between adjacent first independent rollers. The second pressing mechanism includes a second shaft and a plurality of second independent rollers. The plurality of second independent rollers are rotatably mounted on the second shaft and arranged adjacent to each other along the axial direction, with a second gap formed between adjacent second independent rollers. The plurality of first independent rollers and the plurality of second independent rollers are arranged in an alternating manner along the axial direction, such that the axial projection of the second independent rollers covers the first gap, and the axial projection of the first independent rollers covers the second gap.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This utility model uses two pressing mechanisms. By staggering the rollers of the double pressure rollers, the pressing trajectory of the first pressure roller can cover the gap of the second pressure roller, completely eliminating the pressing blind zone that exists in the traditional single pressure roller and ensuring seamless pressing in the joint area.

[0018] 2. In this invention, each roller floats independently via a sponge or spring beneath it. The rollers can adaptively conform to the curved surface of the molding drum and the uneven surface of the material, independently compressing or rebounding, thereby ensuring uniform pressure distribution throughout the joint area and effectively solving the problem of localized incomplete pressing caused by uneven surfaces. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the suture provided in one embodiment of the present invention; Figure 2 This is a top view of the suture device according to one embodiment of this invention;

[0020] Figure 3 This is a schematic diagram of the structure of the suture provided in one embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of a suture provided in another embodiment of the present invention;

[0022] Figure 5 This is a cross-sectional view of the first pressing mechanism provided in this embodiment; Figure 6 This is a cross-sectional view of the second pressing mechanism provided in this embodiment;

[0023] The components corresponding to the various reference numerals in the attached drawings are:

[0024] 3 - Frame; 31 - Base; 33 - First plate; 32 - Second plate; 34 - Base plate; 12 - First pressing mechanism; 16 - Second pressing mechanism; 17 - Guide; 26 - Drive cylinder; 31 - Base; 5 - Adjusting block; 120 - Compression spring; 121 - First independent roller; 122 - First shaft; 123 - First gap; 125 - First floating space; 13 - First elastic support assembly; 14 - Second shaft; 161 - Second independent roller; 162 - Second gap; 163 - Second floating space; 19 - Second elastic support assembly; 35 - First base; 36 - Second base; 37, 38 - Drive cylinder; 18 - Bearing; 15 - Copper sleeve. Detailed Implementation

[0025] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. The following examples are merely illustrative and do not constitute a limitation on the scope of protection.

[0026] The double-roller joint sewing machine of this utility model can be mounted on a first linear guide rail, which is arranged along the extension direction of the tire joint, i.e., the left and right direction, so that the joint sewing machine can move along this direction and achieve full sewing of the joint area by reciprocating left and right.

[0027] Please see Figures 1-3 The joint sewing machine includes a frame 3, a first pressing mechanism 12, and a second pressing mechanism 16. The frame 3 is slidably connected to a linear guide rail 17 via a bottom slider. The guide rail 17 is arranged perpendicularly to the first linear guide rail, i.e., the guide rail 17 extends in the front-to-back direction. The joint sewing machine can move back and forth along the guide rail 17. During tire molding, the joint position and the horizontal dimension of the molding drum differ for different tire models. The sewing machine adjusts its relative position to the molding drum / joint by moving on the linear guide rail 17 to ensure that the rollers are aligned with the area to be pressed. During tire loading and unloading, the sewing machine moves along the linear guide rail 17 to the side away from the molding drum to avoid interference. During operation, it moves back to the designated pressing position along the guide rail to complete the reset, thus avoiding interference between the pressing mechanism and other components such as the molding drum and the feeding mechanism.

[0028] This embodiment aims to overcome the defects of uneven pressure distribution and blind spots in the single-roller structure of the prior art. To this end, an improved pressing structure is provided on the frame 3, which includes a first pressing mechanism 12 and a second pressing mechanism 16 arranged in parallel. The two work together to be responsible for the preliminary pre-pressing and final compaction of the joint, respectively.

[0029] Please see Figures 5-6The first pressing mechanism 12 and the second pressing mechanism 16 are mounted parallel to and side by side on the frame 3. The first pressing mechanism 12 includes a first shaft 122, a plurality of first independent rollers 121 and a first elastic support assembly 13. The plurality of first independent rollers 121 are rotatably fitted around the first shaft 122. The plurality of first independent rollers 121 are arranged close together along the axial direction, and a first gap 123 is formed between adjacent first independent rollers 121. A first floating space 125 is formed between the first independent rollers 121 and the first shaft 122. The first elastic support assembly 13 is disposed in the first floating space 125, so that each first independent roller 121 can float up and down independently relative to the first shaft 122. The second pressing mechanism 16 includes a second shaft 14, a plurality of second independent rollers 161, and a second elastic support assembly 19; the plurality of second independent rollers 161 are rotatably fitted around the second shaft 14 and are arranged adjacent to each other along the axial direction to form a second gap 162; a second floating space 163 is formed between the second independent rollers 161 and the second shaft 14, and the second elastic support assembly 19 is disposed in the second floating space 163, so that each second independent roller 161 can float up and down independently relative to the second shaft 14.

[0030] In this way, the first and second independent rollers can float up and down independently through the first and second elastic support components. The floating structure can fit the drum surface of the molding drum and the uneven material after the drum is bonded to the material. It can adaptively fit irregular surfaces and solve the problem of uneven pressure caused by rigid contact in traditional integral pressure rollers.

[0031] In some embodiments of the present invention, the rollers of the first pressing mechanism 12 and the second pressing mechanism 16 are staggered in the axial direction, such that the axial projection of the second independent roller 161 covers the first gap 123, and the axial projection of the first independent roller 121 covers the second gap 162. In this embodiment, the staggered arrangement is half the width of a roller. Thus, the pressing gap of the first pressing mechanism 12 is effectively covered by the rollers of the second pressing mechanism 16, eliminating the pressing blind zone of traditional single-roller pressing mechanisms. The absence of a pressing gap ensures that any point in the tire joint area, especially the cut bevel of the inner liner, can be effectively pressed, fundamentally solving quality problems such as joint lifting, spray residue, and eventual detachment caused by pressing blind zones.

[0032] Specifically, the first pressing mechanism 12 and the second pressing mechanism 16 are disposed within the base 31 of the frame 3; the first shaft 122 and the second shaft 14 are both square shafts. The first elastic support assembly 13 includes a sponge filling the first floating space 125. In this example, the second shaft 14 is fixed to the base 31 by screws. The second independent roller 161 is provided with a bearing 18 inside. The inner ring of the bearing 18 is fixed to the copper sleeve 15, and the outer ring of the bearing 18 is connected to the second independent roller 161. The second elastic support assembly 19 is disposed in the cavity reserved in the copper sleeve 15 and the second shaft 14. The copper sleeve 15 can slide smoothly in the vertical direction along the cavity.

[0033] In a further preferred embodiment of the invention, the invention achieves preliminary positioning and bonding of the joint by first using low-pressure pre-stitching, and then achieving final tight bonding by high-pressure final compaction, fundamentally avoiding the material slippage or joint distortion caused by traditional single-stage high-pressure pressing. In the pre-pressing stage, the pressure roller applies extremely low pressure to the tire joint for the first pressing. This process aims at positioning and preliminary bonding, not final compaction. Its function is to ensure that the multi-layer joint material is gently smoothed and aligned, achieving preliminary bonding and establishing a stable, displacement-free foundation for subsequent high-pressure operations. This gentle initial contact avoids slippage, misalignment, or joint area distortion that may occur due to direct application of high pressure. After pre-pressing, the pressure roller immediately applies higher process pressure to the same joint area that has been initially fixed for a second pressing. Since the material position has been stabilized through low-pressure pre-pressing, this high pressure is evenly and fully transmitted to the entire joint cross-section, achieving deep compaction and strengthening. This stage achieves the final tight bonding of the joint, greatly improving its bonding strength and density.

[0034] Existing pressure preset components include, but are not limited to, installing micro-cylinders within each roller and square shaft, and then controlling the pressure of the micro-cylinders via proportional valves to sequentially control the pressure in zones. Please refer to... Figure 3In some embodiments, the first pressing mechanism 12 and the second pressing mechanism 16 are jointly mounted on a base 31 consisting of a first plate 33, a second plate 32, and a base plate 34. The base plate 34 of the base 31 is directly connected to the piston rod of a drive cylinder 26. The overall downward pressure of the first pressing mechanism 12 and the second pressing mechanism 16 can be controlled integrally through this single drive cylinder 26. In this configuration, the PLC controls the output force of the drive cylinder 26 via a proportional valve. For example, during the forward stroke of the sewing machine, the cylinder outputs a smaller total pressure, allowing the two pressing mechanisms to perform initial positioning and bonding of the joint with a common low pressure; during the return stroke, the PLC switches commands to cause the cylinder to output a larger total pressure, allowing the two pressing mechanisms to then perform final compaction of the pre-pressed joint with a common high pressure. This scheme has a relatively simple structure and, through the timing control of a single power source and the direction of movement, can achieve the effect of low-pressure pre-sewing and high-pressure compaction, thus avoiding the material slippage problem of traditional single-stage high-pressure pressing to a certain extent. In some preferred embodiments, the present invention employs an independent pressure control scheme. Please refer to [link / reference]. Figure 4 The frame 3 can be equipped with independent first and second seats 35 and 36, or functional isolation can be achieved within a single seat 31, where the first pressing mechanism 12 and the second pressing mechanism 16 are respectively installed. One pressure preset assembly includes a drive cylinder 37, whose piston rod is connected to the seat or base plate supporting the first pressing mechanism 12, forming the first pressure preset assembly. This drive cylinder is controlled by a proportional valve, and the PLC can independently set the required low pressure (e.g., 0.1-0.4 Bar) for the first pressing mechanism 12 by adjusting the proportional valve. Similarly, this suture device is equipped with a second pressure preset assembly, which includes another independent cylinder 38 (not shown in the drawings for simplicity) and its control proportional valve. This cylinder is connected to the seat or base plate supporting the second pressing mechanism 16 and is used to independently set a high pressure (e.g., 2.5-3.5 Bar) for the second pressing mechanism 16. Thus, during a single unidirectional movement of the stitching machine, the pressing mechanism (whether the first or second mechanism) located at the front of the movement direction operates at low pressure for pre-pressing; the pressing mechanism immediately following behind operates at high pressure for final compaction. This achieves the complete process of positioning and compaction without interruption during a single movement. This implementation achieves seamless connection between pre-pressing and final pressing. Because the first and second pressing mechanisms are arranged adjacent to each other in the movement direction, a single movement of the stitching machine allows any point on the tire joint to undergo pre-pressing and final pressing sequentially in a very short time, improving production efficiency. It virtually eliminates the process interval between the two pressing operations, ensuring that the joint material is immediately compacted after alignment and positioning, avoiding the adverse effects on the final bond strength that might result from material springback, rubber cooling, or stress relaxation caused by the interval, thereby further ensuring the ultimate stability and reliability of the joint pressing quality.

[0035] In this embodiment, the first pressing mechanism 12 serves as a pre-pressing unit, employing a first independent roller 121 with a smaller diameter. (See also...) Figure 5 The floating space between the first independent roller 121 and the first shaft 122 is filled with a sponge 13 as an elastic medium. The small-diameter roller generates higher pressure under the same pressure, easily overcoming the surface tension of the material; the sponge 13 is extremely soft in the initial stage, achieving large-area contact and initial adhesion with minimal pressure of 0.1-0.4 Bar, perfectly avoiding material displacement; as the compression increases, its stiffness gradually increases, providing a smooth transition of pressure for the material. (See also...) Figure 6 The second pressing mechanism 16 serves as the final pressing unit, employing a second independent roller 161 with a larger diameter. A spring 19 is installed between the roller 161 and the second shaft 14 as a second elastic support assembly. The large-diameter roller provides a smoother compaction surface, effectively preventing wrinkles in the material under high pressure. The spring pressure is proportional to the compression amount, stable and predictable, and can provide a huge and stable rebound force to achieve high-pressure deep compaction.

[0036] Furthermore, in the specific implementation of the first pressing mechanism 12, in addition to the sponge 13 within the first floating space 125, an auxiliary support assembly is also provided between the seat 31 and the first shaft 122. This assembly includes a compression spring 120 and an adjustable adjustment block 5. The preload of the compression spring 120 acts directly on the first shaft 122, thereby providing additional support for the entire first pressing mechanism 12. During the normal low-pressure pre-pressing stage, the sponge 13 undergoes compression deformation to provide the required compliant fit, at which point the compression spring 120 is essentially in a non-primary load-bearing state. When the sponge 13 is compressed to near its material limit due to process requirements such as high-pressure final pressure stroke or abnormal thickening of the joint area, the compression spring 120 begins to intervene and bear the load. This effectively prevents the sponge from undergoing permanent deformation or failure due to over-compression. At the same time, by rotating the adjustment block 5 to adjust the preload of the compression spring 120, the timing at which it begins to provide significant support force can be set, allowing the system to flexibly adapt to different process pressures and stroke requirements.

[0037] The first pressing mechanism 12 uses a smaller gap width to ensure a dense distribution of pressing points during the pre-pressing stage, achieving precise initial positioning; the second pressing mechanism 16 uses a larger gap width, which not only ensures reasonable flow space for the material under high pressure, but also ensures the integrity of the pressing coverage through precise staggered layout.

[0038] As mentioned above, the second independent roller 161 is connected to the copper sleeve 15 through a deep groove ball bearing 18: under high pressure pressing conditions, the outer ring of the bearing 18 can rotate freely while the inner ring remains relatively fixed, which solves the problem of material stretching or joint misalignment caused by static friction in traditional structures, ensuring that the roller can rotate freely with the material surface; at the same time, the larger second gap 162 provides the necessary movement space for the rotation of the second independent roller 161, avoiding interference with adjacent rollers during rotation.

[0039] Exemplarily, a dual-cylinder driven stitcher is provided herein ( Figure 4 The joint stitching process (as shown) includes the following steps:

[0040] 1. Synchronized movement and positioning:

[0041] Pressure preset and positioning: According to process requirements, the PLC sets high and low pressure reference forces for the drive cylinder 37 (first pressure preset component) and the other cylinder 38 (second pressure preset component) respectively through proportional valves. The sewing machine moves radially to align with the joint area via linear guide 17.

[0042] 2. Pre-compression stage: bonding Figure 5 The sewing machine moves along the joint direction. The first pressing mechanism 12 first contacts the joint under a preset low pressure, and the sponge 13 gently conforms it. Each first independent roller 121 floats adaptively, completing the precise positioning and initial bonding of the joint.

[0043] 3. Final pressing stage: Following this, the bonding... Figure 6 The second pressing mechanism 16 rolls the same joint area that has been positioned under a preset high pressure. The spring 19 provides stable force, and each second independent roller 161 further compacts the material. Due to the staggered arrangement, this high-pressure compaction completely covers the gap of the previous low-pressure pre-compression.

[0044] After completing a single pressing stroke, the suture device can return to the starting point. During the return stroke, the pressure output of the two preset pressure components can be quickly switched via PLC control, realizing the dynamic interchange of pressing functions and performing the next gradient pressing, forming an efficient and continuous operation cycle.

Claims

1. A double-pressure roller joint sewing device for a forming machine joint, characterized in that, include: frame; The first pressing mechanism and the second pressing mechanism are mounted on the frame in parallel and side by side; The first pressing mechanism includes a first shaft, a plurality of first independent rollers, and a first elastic support assembly; the plurality of first independent rollers are rotatably mounted on the outside of the first shaft and arranged close together along the axial direction, with a first gap formed between adjacent first independent rollers; a first floating space is formed between the first independent rollers and the first shaft, and the first elastic support assembly is disposed in the first floating space, so that each first independent roller can float up and down independently relative to the first shaft; The second pressing mechanism includes a second shaft, a plurality of second independent rollers, and a second elastic support assembly; the plurality of second independent rollers are rotatably mounted on the second shaft and arranged close together along the axial direction, with a second gap formed between adjacent second independent rollers; a second floating space is formed between the second independent rollers and the second shaft, and the second elastic support assembly is disposed in the second floating space, so that each second independent roller can float up and down independently relative to the second shaft.

2. The molding machine joint double pressure roller joint sewing device according to claim 1, characterized in that, The plurality of first independent rollers and the plurality of second independent rollers are arranged in an alternating manner in the axial direction, such that the axial projection of the second independent rollers covers the first gap, and the axial projection of the first independent rollers covers the second gap.

3. The molding machine joint double pressure roller joint sewing device according to claim 2, characterized in that, The misalignment of the staggered arrangement is half the width of the roller.

4. The molding machine joint double pressure roller joint sewing device according to claim 1, characterized in that, The suture device includes a pressure control device for controlling the pressure of the first pressing mechanism and the second pressing mechanism.

5. The molding machine joint double pressure roller joint sewing device according to claim 4, characterized in that, The pressure control device includes a first pressure preset component and a second pressure preset component, which are respectively used to adjust the pressing pressure of the first pressing mechanism and the second pressing mechanism.

6. The molding machine joint double pressure roller joint sewing device according to claim 5, characterized in that, Both the first pressure preset component and the second pressure preset component include a drive cylinder and a proportional valve, and the piston rod of the drive cylinder is adapted to be connected to the first pressing mechanism and the second pressing mechanism.

7. The molding machine joint double pressure roller joint sewing device according to claim 1, characterized in that, The first elastic support component includes a sponge, and the second elastic support component includes a spring.

8. The molding machine joint double pressure roller joint sewing device according to claim 1, characterized in that, The first elastic support assembly also includes an auxiliary compression spring disposed between the first shaft and the frame.

9. The molding machine joint double pressure roller joint sewing device according to claim 1, characterized in that, The diameter of the first independent roller is smaller than the diameter of the second independent roller, and the width of the second gap is greater than the width of the first gap.

10. A double-pressure roller joint sewing device for a forming machine joint, characterized in that, The device includes a frame, a first pressing mechanism, and a second pressing mechanism. The first pressing mechanism and the second pressing mechanism are mounted parallel to and side-by-side on the frame. The first pressing mechanism includes a first shaft and a plurality of first independent rollers. The plurality of first independent rollers are rotatably mounted on the first shaft and arranged adjacent to each other along the axial direction, with a first gap between adjacent first independent rollers. The second pressing mechanism includes a second shaft and a plurality of second independent rollers. The plurality of second independent rollers are rotatably mounted on the second shaft and arranged adjacent to each other along the axial direction, with a second gap between adjacent second independent rollers. The plurality of first independent rollers and the plurality of second independent rollers are arranged in an alternating manner along the axial direction, such that the axial projection of the second independent rollers covers the first gap, and the axial projection of the first independent rollers covers the second gap.

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