Anti-overflow device

Abstract

The present invention belongs to the field of tire manufacturing, and in particular, relates to a device for preventing glue overflow suitable for tire active molds or two-half molds. The device is used to close the parting surface of the mold that is not completely closed and the parting surface to be matched in advance, including a closing part fixed on the parting surface, which closes the gap between the two mold surfaces to be matched in advance; and a limiting part, which limits the stroke of the closing part. The closing part of the present invention can automatically compensate for the wear gap caused by daily wear of the mold by the extrusion part, which reduces the mold maintenance cost, extends the mold maintenance cycle, greatly reduces the mold maintenance frequency, and is convenient to maintain and simple to operate; it can also reduce the consumption of tire raw materials, improve the appearance quality of the tire, reduce waste and defective products, and will not have an adverse effect on the quality and performance of the finished tire.

Description

Technical Field

[0001] The invention belongs to the field of tire manufacturing, and in particular relates to a rubber overflow prevention device suitable for a tire active mold or a two-half mold. Background Art

[0002] At present, there are mainly two types of vulcanization molds for tires: flexible molds and two-half molds. Flexible molds are composed of pattern blocks, mold sleeves, and side panels, and there are gaps between each part; the two-half molds are composed of upper molds and lower molds, and there is also a gap between the two. During the mold closing process, due to the shaping pressure, mold closing force, and as the mold closing is approaching the end, the space of the semi-finished tire embryo in the mold is reduced. During this process, some rubber will be squeezed into the matching gaps of various parts, thus forming rubber edges. Or because the matching gaps between various parts of the mold become larger due to wear or other reasons, during the mold closing and vulcanization process, the rubber has a certain fluidity. After the mold is closed, there are gaps between the various parts of the mold, so the rubber will flow to the gaps, causing overflow and forming rubber edges. When the rubber edge appears, the trimming process must be carried out, which wastes manpower, material resources and time, and seriously affects the appearance quality of the tire.

[0003] In the prior art, the formation of the glue edge is generally controlled by the following aspects:

[0004] 1. By adjusting the embryo size: the smaller the embryo size, the less rubber edge, but reducing the embryo size will have an adverse effect on product quality and performance;

[0005] 2. Control the raised position of the tire wing rubber during lamination by the molding machine: the smoother the lamination, the less rubber edge there is, but the lamination effect is often poor and time-consuming, and it can only reduce the rubber edge to a certain extent, but cannot prevent the formation of rubber edge;

[0006] 3. Adjust the molding height by reducing the vulcanization molding pressure: the smaller the molding pressure, the less the extrusion on the tire blank and the less the rubber edge. However, it can only reduce the rubber edge to a certain extent, but cannot prevent the formation of the rubber edge. In addition, too small molding pressure will have an adverse effect on product quality.

[0007] 4. Repair the clearance of various parts of the mold: The maintenance cost is high, the maintenance takes a long time, and the maintenance process is demanding. It is easy to cause slight deformation of the mold, which has an adverse effect on product quality and performance; and as the use time increases, wear and tear and bumps of the mold will reappear, requiring repeated maintenance, which greatly increases the cost.

[0008] Therefore, it is urgent to develop a device that is simple to operate and easy to maintain, and can prevent various factors from squeezing the tire blank during the mold closing process, resulting in the formation of tire rubber edges, as well as the formation of tire rubber edges due to large gaps between mold mating surfaces. Summary of the invention

[0009] In view of the above-mentioned technical problem of the existing mold glue edge, the present invention provides a mold expansion and contraction device which can prevent the formation of the glue edge.

[0010] In order to achieve the above object, the technical solution adopted by the present invention is:

[0011] A glue overflow prevention device, characterized in that it is used to close the parting surface of the mold that is not completely closed and the parting surface to be matched in advance, including

[0012] The closing part is fixed on the parting surface to close the gap between the parting surface and the parting surface to be matched in advance;

[0013] A limiting portion, for limiting the travel of the closing portion;

[0014] The extrusion part provides a pressing force for the closing part toward the parting surface to be matched so that the gap between the parting surface and the parting surface to be matched is closed in advance.

[0015] Preferably, the extrusion portion is arranged between the closing portion and the parting surface.

[0016] Preferably, the extrusion portion is a retractable structure, which uses the elastic force during compression to provide displacement power for the closing portion, so that it closes with the parting surface to be matched at the other end of the closing portion, and automatically compensates for the gap between the two parting surfaces.

[0017] Preferably, the shape of the end surface of the closing portion facing the parting surface to be matched is adapted to the shape of the parting surface to be matched, so that the closing portion and the parting surface to be matched are seamlessly closed to prevent the rubber from overflowing and forming a rubber edge.

[0018] Preferably, a mounting hole for placing the extrusion portion is provided at one end of the closing portion away from the parting surface to be matched.

[0019] Preferably, a limiting hole is provided on the outer side of the closing portion, and the displacement length of the closing portion is controlled by the length of the limiting hole.

[0020] Preferably, a limiting rod is provided in the middle of the limiting portion, and the limiting rod is located in the limiting hole.

[0021] Preferably, a limiting block is protruding from the outer side of the closing portion, which can lock the closing portion to prevent it from moving out from the side of the parting surface.

[0022] Preferably, two ends of the limiting part are provided with bolt holes to fix the limiting part on the mold.

[0023] Preferably, the limiting portion is a limiting screw.

[0024] The number of the anti-glue overflow device installed on the mold is at least one.

[0025] Compared with the prior art, the advantages and positive effects of the present invention are:

[0026] 1. The arrangement of the closing portion in the present invention can close the mold parting surface and the parting surface to be matched in advance when the mold is not completely closed, thereby preventing the generation of tire rubber edges due to the extrusion of the tire blank by various factors during the mold closing process and the generation of tire rubber edges due to the large gap between the mold matching surfaces;

[0027] 2. The limiter is used to control the displacement stroke of the closing part to meet the different requirements of different molds for displacement stroke;

[0028] 3. The extrusion part can provide enough force for the closing part to close with the parting surface to be matched, and automatically compensate the gap between the parting surface and the parting surface to be matched by telescoping;

[0029] 4. The present invention completely improves the tire rubber edge problem of the finished product from the mold aspect, saving a lot of manpower, material resources and time.

[0030] 5. The closing part of the present invention can automatically compensate for the wear gap of the mold due to daily wear, thereby reducing the mold maintenance cost, extending the mold maintenance cycle, greatly reducing the mold maintenance frequency, and convenient maintenance and simple operation.

[0031] 6. The present invention can also reduce the consumption of tire raw materials, improve the appearance quality of tires, reduce waste and defective products, and will not have an adverse effect on the quality and performance of finished tires. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 This is a schematic structural diagram of a closing portion of a first embodiment of the present invention;

[0034] Figure 2 This is a schematic structural diagram of a position limiting portion according to an embodiment of the present invention;

[0035] Figure 3 It is a schematic diagram of the structure of the extrusion part of Embodiments 1 and 2 of the present invention;

[0036] Figure 4 It is a schematic structural diagram of the anti-glue overflow device of the first embodiment of the present invention when the mold is not completely closed;

[0037] Figure 5 This is a schematic structural diagram of a closing portion of a second embodiment of the present invention;

[0038] Figure 6 This is a schematic structural diagram of a position limiting portion in a second embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of the structure of a connection block according to a second embodiment of the present invention;

[0040] Figure 8 It is a schematic structural diagram of the anti-glue overflow device of the second embodiment of the present invention when the mold is not completely closed;

[0041] In the above figures: 1. closing part; 11. mounting hole; 12. limiting hole; 13. limiting block; 2. limiting part; 21 limiting rod; 22. bolt hole; 3. extrusion part; 4. pattern block; 5. side plate; 6. bolt; 7. lower mold parting surface; 8. upper mold parting surface; 9. connecting block; 91. bolt hole. DETAILED DESCRIPTION

[0042] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0043] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Embodiment 1

[0047] like Figure 1-3 FIG. 1 is an embodiment of the anti-overflow glue device of the present invention, which is used to close the parting surface of the mold that is not completely closed and the parting surface to be matched in advance, such as Figure 4 As shown, when applied to an active mold, each pattern block is installed with one or more of the above-mentioned anti-overflow glue devices, the pattern block 4 serves as a parting surface, and the side plate 5 serves as a parting surface to be matched.

[0048] The mold closing device includes a closing portion 1 fixed on the pattern block 4, such as Figure 1 As shown, the closing portion 1 closes the gap between the pattern block 4 and the side plate 5; and also includes a limiting portion 2, which limits the travel of the closing portion 1, such as Figure 2 As shown; in order to further achieve close fit and reduce manual operation, an extrusion portion 3 is provided between the closing portion 1 and the pattern block 4. The extrusion portion 3 provides a pressing force for the closing portion 1 toward the parting surface to be matched so that the gap between the pattern block 4 and the side plate 5 is closed in advance. In this embodiment, the extrusion portion 3 is a retractable spring. The spring provides displacement power for the closing portion 1, so that it automatically closes with the side plate 5 located at the other end of the closing portion 1, and automatically compensates for the gap between the pattern block 4 and the side plate 5. The extrusion portion 3 can also be other components with a retractable structure.

[0049] Among them, the shape of the side plate 5 of the closing part 1 facing the parting surface to be matched is adapted to the shape of the side plate 5. The shape of the end face needs to be processed according to the size of the side plate 5 and the curve of the pattern circle, so that the closing part and the side plate 5 are seamlessly closed to prevent the rubber from overflowing and forming a rubber edge. The remaining end faces of the closing part 1 are selected according to the size of the sharp angle formed when cutting the pattern block 4 to select whether to use a straight plane or a plane with different angles. The inclination angle is to minimize the thin sharp angle formed by cutting the pattern block 4, so that the sharp angle has a certain thickness and maintains a certain strength. The closing part 1 needs to be processed by precision CNC lathe. Depending on the material, the processing tolerance is required to be ≤0.1mm and the surface finish Ra≤1.6.

[0050] The end of the closing portion 1 which is away from the side plate 5 to be matched with the parting surface is provided with a mounting hole 11 for placing the extrusion portion 3. The number of the mounting holes 11 varies according to the size of the pattern block 4, such as Figure 1 As shown, in this embodiment, there are 6 mounting holes 11. According to the size of the tread block 4 in practice, the number of mounting holes can also be a natural number such as 1, 2, 3, etc. The distribution principle is that the extrusion part 3 placed in the mounting hole 11 can provide sufficient elastic force so that the closing part can be uniformly ejected and compressed. The extrusion part 3 is a retractable component. In this embodiment, a spring is used. The depth and number of the mounting holes 11 need to be determined by comprehensively considering the size and elastic strength of the selected spring.

[0051] A limiting hole 12 is provided on the outer side of the closing part 1, and a limiting rod 21 is provided in the middle of the limiting part 2. The limiting rod 21 is located in the limiting hole 12. The displacement length of the closing part 1 is controlled by the length of the limiting hole 12. In order to further limit the limiting part 2, a limiting block 13 is protruded from the outer side of the closing part 1.

[0052] When the present embodiment is used, the extrusion part 3 is first installed into the hole reserved in advance in the pattern block 4, and the closing part 1 is installed on the pattern block 4, so that the other end of the extrusion part 3 is inserted into the installation hole 11 on the closing part 1, and the limiting part 2 is fixed to the pattern block 4 by the bolt 6, and the limiting rod 21 on the limiting part 2 is inserted into the limiting hole 12 of the closing part 1. The length of the limiting hole 12 controls the length of the closing part. At the same time, the limiting blocks 13 fixed at both ends of the pattern block 4 can lock the closing part to prevent it from moving out from the side of the pattern block 4. When the mold is not closed, the closing part 1 Under the action of the extrusion part 3 and the limiting part 2, the tread block 4 always protrudes a certain distance from the mating surface of the mold. When the tread block 4 begins to move to the closing part 1 and contacts with the mating surface of the side plate 5, the mold is closed in advance due to the existence of the closing part. In the subsequent mold closing process, no matter how the mold squeezes the tire blank, the rubber cannot flow out of the gap because the mold is closed in advance. During the entire mold closing process until the mold is completely closed, the extrusion part 3 will always apply an outward pressure to the closing part, forcing the closing part 1 to remain closed with the mold side plate 5 throughout the process, so that the rubber can flow out without a gap to form a rubber edge.

[0053] Embodiment 2

[0054] like Figure 5-8 FIG. 2 is another embodiment of the anti-overflow glue device of the present invention, which is used to close the parting surface of the two half molds that are not completely closed and the parting surface to be matched in advance, such as Figure 5 As shown, the lower mold parting surface 7 serves as the parting surface, and the upper mold parting surface 8 serves as the parting surface to be matched.

[0055] When in use, first install the extrusion part 3 into the hole reserved in advance on the lower mold parting surface 7, and then install the closing part 1 into the hole reserved in advance on the lower mold parting surface 7, so that the other end of the extrusion part 3 is inserted into the mounting hole 11 on the closing part 1; since the gap between the upper mold and the lower mold in the two half molds is a complete circle, multiple closing parts 1 need to be connected together, and two adjacent closing parts 1 are connected by a connecting block 9, and bolt holes 91 are provided at both ends of the connecting block, and the two closing parts 1 are fixedly connected by bolts. In order to fix multiple closing parts 1 into one by bolts, in this embodiment, the limiting part 2 is a limiting bolt, which is inserted into the limiting hole 12 of the closing part 1 from the outer edge of the lower mold, and the length of the limiting hole 12 is used to control the extension and contraction length of the closing part 1 to prevent it from moving out of the lower mold. When the mold is not closed, the closing part 1 always protrudes a certain distance from the lower mold parting surface 7 under the action of the extrusion part 3 and the limiting part 2. When the upper mold begins to move to contact the closing part 1, the mold is closed in advance due to the existence of the closing part 1. In the subsequent mold closing process, no matter how the mold squeezes the tire blank, the rubber cannot flow out of the gap because the mold is closed in advance. During the entire mold closing process until the mold is completely closed, the extrusion part 3 will always give the closing part an outward pressure, forcing the closing part 1 to remain closed with the upper mold parting surface 8 throughout the entire process, so that the rubber can flow out without a gap to form a rubber edge.

[0056] The closing portion 1 of the present invention can automatically compensate for the wear gap of the mold due to daily wear and tear by the extrusion portion 3, thereby reducing the mold maintenance cost, extending the mold maintenance cycle, greatly reducing the mold maintenance frequency, and convenient maintenance and simple operation; it can also reduce the consumption of raw materials for a single tire, improve the appearance quality of the tire, reduce waste and defective products, and will not have an adverse effect on the quality and performance of the finished tire.

[0057] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An anti-overflow glue device is arranged between the parting surface of the mold and the parting surface to be matched, and closes the parting surface of the mold and the parting surface to be matched that are not completely closed in advance, characterized in that: include: The closing part is fixed on the parting surface to close the gap between the parting surface and the parting surface to be matched in advance; the end of the closing part away from the parting surface to be matched is provided with a mounting hole for placing the extrusion part; a limiting hole is provided on the outer side of the closing part; and a limiting block is provided on the outer side of the closing part; A limiting part is used to limit the stroke of the closing part; a limiting rod is arranged in the middle of the limiting part, the limiting rod is located in the limiting hole, and bolts are fixed at both ends of the limiting part to fix the limiting part on the parting surface; An extrusion part, providing a pressing force for the closing part toward the parting surface to be matched, so that the gap between the parting surface and the parting surface to be matched is closed in advance; When applied to the active mold, each pattern block is installed with one or more of the above-mentioned anti-overflow glue devices. The pattern block serves as the parting surface, and the side plate serves as the parting surface to be matched. When in use, the extrusion part is first installed in the hole reserved in advance in the pattern block, and the closing part is installed on the pattern block, so that the other end of the extrusion part is inserted into the installation hole on the closing part, and the limiting part is fixed to the pattern block by bolts, and the limiting rod on the limiting part is inserted into the limiting hole of the closing part. The length of the limiting hole is used to control the extension and contraction length of the closing part. At the same time, the limiting blocks fixed at both ends of the pattern block can lock the closing part to prevent it from being removed from the pattern block. Lateral movement: When the mold is not closed, the closing part always protrudes a certain distance from the matching surface of the mold pattern block under the action of the extrusion part and the limiting part. When the pattern block begins to move to the closing part and contacts the matching surface of the side plate, the mold is closed in advance due to the existence of the closing part. In the subsequent mold closing process, no matter how the mold squeezes the tire blank, the rubber cannot flow out of the gap because the mold is closed in advance. During the entire mold closing process until the mold is completely closed, the extrusion part will always give the closing part an outward pressure, forcing the closing part to remain closed with the mold side plate throughout the process, so that the rubber flows out without gaps to form a rubber edge. The extrusion part is a retractable spring, which provides displacement power for the closing part, so that it automatically closes with the side plate located at the other end of the closing part, and automatically compensates for the gap between the pattern block and the side plate; the closing part can automatically compensate for the wear gap caused by daily wear of the mold.

2. The anti-glue overflow device according to claim 1, characterized in that: The extrusion portion is arranged between the closing portion and the parting surface.

3. The anti-glue overflow device according to claim 1, characterized in that: The shape of the end surface of one end of the closing portion facing the parting surface to be matched is adapted to the shape of the parting surface to be matched.

4. The anti-glue overflow device according to claim 1, characterized in that: The limiting part is a limiting screw.

Images