Molding drum locking device and molding drum

Abstract

The application provides a forming drum locking device and a forming drum. The forming drum locking device comprises a rubber ring, an expansion and contraction mechanism and a supporting mechanism, which are arranged around a main shaft. The expansion and contraction mechanism is sleeved on the main shaft and located at the inner side of the rubber ring, so as to lift the rubber ring in the radial direction of the main shaft through expansion and contraction movement. The supporting mechanism is sleeved on the main shaft and located at the inner side of the rubber ring. The supporting mechanism is arranged at one side of the expansion and contraction mechanism in the axial direction of the main shaft, and the supporting mechanism is arranged to be expandable and contractible in the radial direction of the main shaft, so as to support the toe of the tire. The forming drum locking device of the application solves the problem of high tire defective rate in the production of the forming drum for producing safety tires in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tire manufacturing technology, in particular to a forming drum locking device and a forming drum. BACKGROUND

[0002] Since the tire side of the run-flat tire (i.e. safety tire) needs to increase a layer of thick support rubber to increase the thickness and rigidity of the tire side, the support rubber needs to be attached to the locking head of the run-flat tire forming drum, and the locking head assembly of the run-flat forming drum is usually arranged with a concave curved groove. After the inner liner is attached, the support rubber is attached to the curved groove position, and then the cord is attached and the reverse package forming is performed.

[0003] At present, there is a run-flat forming drum on the market, and the curved groove of the locking head can be radially expanded and contracted. After the groove is expanded, the drum surface is flat and supports the rubber material, which can ensure the attachment of the inner liner. However, a major drawback of this kind of tire is that it will cause bubbles at the toe of the green tire during production, resulting in unqualified products and affecting the quality of the tire. SUMMARY

[0004] The main purpose of the present application is to provide a forming drum locking device and a forming drum to solve the problem of high tire substandard rate in the production of safety tire forming drum in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a forming drum locking device is provided, comprising: a rubber ring arranged around a main shaft; an expansion and contraction mechanism arranged on the main shaft and located inside the rubber ring, so as to lift the rubber ring along the radial direction of the main shaft by expansion and contraction movement; a support mechanism arranged on the main shaft and located inside the rubber ring, wherein the support mechanism is arranged on one side of the expansion and contraction mechanism along the axial direction of the main shaft, and the support mechanism is arranged to be expandable and contractable along the radial direction of the main shaft, so as to support the toe of the tire.

[0006] Further, the expansion and contraction mechanism comprises: a plurality of expansion and contraction plate assemblies arranged around the main shaft and respectively movably extended and contracted along the radial direction of the main shaft; a driving assembly drivingly connected with the plurality of expansion and contraction plate assemblies respectively, so as to simultaneously drive the plurality of expansion and contraction plate assemblies to move.

[0007] Further, the driving assembly comprises: a driving ring movably sleeved on the main shaft along the axial direction of the main shaft, wherein the outer side of the driving ring is provided with a first inclined taper surface arranged obliquely relative to the radial direction of the main shaft, and the plurality of expansion and contraction plate assemblies are arranged around the first inclined taper surface, and the driving ring moves to push each expansion and contraction plate assembly to move along the radial direction of the main shaft through the first inclined taper surface.

[0008] Further, the locking device further comprises a first cavity and a second cavity respectively located at two sides of the driving ring in the axial direction of the main shaft, wherein the driving ring is driven to move towards the support mechanism by inflating the first cavity and exhausting the second cavity, or the driving ring is driven to move away from the support mechanism by inflating the second cavity and exhausting the first cavity.

[0009] Further, the expansion and contraction mechanism further comprises a guide sleeve, the guide sleeve is sleeved on the main shaft, wherein a plurality of guide holes are arranged on the guide sleeve, the guide holes extend along the radial direction of the main shaft, and a plurality of expansion and contraction plate assemblies are movably inserted into the guide holes to move along the extension direction of the guide holes.

[0010] Further, the expansion and contraction plate assembly comprises a guide rod and a supporting plate arranged perpendicularly, the guide rod is slidably inserted into the guide hole, wherein a first inclined surface is arranged at one end of the guide rod to abut against the first inclined conical surface, and the supporting plate is arranged perpendicularly at the end of the guide rod away from the first inclined conical surface to abut against the inner side of the rubber ring.

[0011] Further, the locking device further comprises a limiting block assembly, the limiting block assembly is adjustably arranged along the axial direction of the main shaft to limit the movement range of the driving ring by stopping the driving ring.

[0012] Further, the support mechanism comprises a plurality of support plate assemblies, the plurality of support plate assemblies are arranged around the main shaft and are movably arranged along the radial direction of the main shaft to support the toe of the tire by supporting the rubber ring.

[0013] Further, the locking device further comprises a third cavity and a fourth cavity respectively located at two sides of the support plate assembly in the radial direction of the main shaft, wherein the plurality of support plate assemblies are driven to move outwardly by inflating the third cavity and exhausting the fourth cavity, or the plurality of support plate assemblies are driven to move towards the main shaft by inflating the fourth cavity and exhausting the third cavity.

[0014] Further, the forming drum locking device further comprises a bead locking mechanism, the bead locking mechanism comprises a plurality of locking block assemblies, the plurality of locking block assemblies are arranged around the main shaft and are movably arranged along the radial direction of the main shaft to lock the bead of the tire by supporting the rubber ring, wherein the expansion and contraction mechanism, the support mechanism and the bead locking mechanism are arranged in sequence along the axial direction of the main shaft.

[0015] Further, the bead locking mechanism further comprises a piston, the piston is sleeved on the main shaft and is movably arranged along the axial direction of the main shaft, wherein a second inclined conical surface is arranged on the outer side of the piston to be inclined relative to the radial direction of the main shaft, and a second inclined surface is arranged on the inner side of the locking block assembly to abut against the second inclined conical surface, the piston is moved to push each locking block assembly to move along the radial direction of the main shaft through the second inclined conical surface.

[0016] Further, the forming drum locking device further comprises a stretching mechanism movably arranged on the main shaft, the stretching mechanism being connected with one end of the rubber ring to drive the rubber ring to stretch along the axial direction of the main shaft, wherein the stretching mechanism, the expansion and contraction mechanism and the supporting mechanism are sequentially arranged along the axial direction of the main shaft.

[0017] Further, the stretching mechanism comprises a telescopic sleeve movably sleeved on the main shaft, wherein the locking device further comprises a fifth cavity and a sixth cavity respectively located on both sides of the telescopic sleeve in the axial direction, wherein the telescopic sleeve is driven to move close to the expansion and contraction mechanism to contract the rubber ring by inflating the fifth cavity and exhausting the sixth cavity, or the telescopic sleeve is driven to move away from the expansion and contraction mechanism to stretch the rubber ring by inflating the sixth cavity and exhausting the fifth cavity.

[0018] According to another aspect of the present application, a forming drum is provided, comprising a main shaft, two side drum bodies and two forming drum locking devices, wherein the two side drum bodies are sequentially arranged on the main shaft, and the two forming drum locking devices are respectively arranged at one end of the two side drum bodies close to each other, and the forming drum locking device is the above-mentioned forming drum locking device.

[0019] The forming drum locking device of the technical scheme of the present application is mainly applied to the forming drum for producing safety tires, and the locking device comprises a rubber ring, an expansion and contraction mechanism and a supporting mechanism, and the rubber ring is arranged around the main shaft; the rubber ring has a certain elasticity, the expansion and contraction mechanism is sleeved on the main shaft and located on the inner side of the rubber ring to lift the rubber ring to expand and contract along the radial direction of the main shaft by expansion and contraction. When the inner liner needs to be attached, the expansion and contraction mechanism is expanded outward to push the rubber ring to expand, so that the outer side of the rubber ring is flush with the outer surface of the side drum body, ensuring that the inner liner will not be suspended when attached, and problems such as poor attachment or wrinkles will not occur. After the inner liner is attached, in order to increase the thickness of the tire side, the supporting rubber needs to be attached at the rubber ring, at this time, the expansion and contraction mechanism needs to be contracted, and the rubber ring is contracted inward under the elastic restoring force of itself to form a groove, which can accommodate the supporting rubber to increase the thickness of the tire side during the reverse wrapping. In addition, in order to avoid the generation of air bubbles at the toe of the green tire during the attachment of the material, the supporting mechanism of the present application is sleeved on the main shaft and located on the inner side of the rubber ring, wherein the supporting mechanism is arranged on one side of the expansion and contraction mechanism along the axial direction of the main shaft, and the supporting mechanism is arranged to be expandable and contractable along the radial direction of the main shaft to support the toe of the tire by lifting the rubber ring corresponding to the toe position, thereby avoiding the problem of air bubbles at the toe. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0021] Figure 1Fig. 1 shows a schematic view of an embodiment of a forming drum according to the present application;

[0022] Figure 2 Fig. 2 shows a cross-sectional view of two forming drum locking devices in an embodiment of the forming drum of the present application;

[0023] Figure 3 Fig. 3 shows a schematic view of an embodiment of the forming drum locking device of the present application in which the expansion mechanism is expanded;

[0024] Figure 4 Fig. 4 shows a schematic view of an embodiment of the forming drum locking device of the present application in which the stretching mechanism is contracted;

[0025] Figure 5 Fig. 5 shows a schematic view of an embodiment of the forming drum locking device of the present application in which the supporting mechanism is jacked up.

[0026] In the above drawings, the following reference signs apply:

[0027] 10, main shaft; 11, rubber ring; 20, expansion mechanism; 21, driving ring; 211, first inclined taper surface; 22, first cavity; 23, second cavity; 24, guide sleeve; 241, guide hole; 25, guide rod; 251, first inclined surface; 26, supporting plate; 30, supporting mechanism; 31, supporting plate assembly; 311, third cavity; 312, fourth cavity; 50, locking block assembly; 501, second inclined surface; 51, piston; 511, second inclined taper surface; 60, telescopic sleeve; 61, fifth cavity; 62, sixth cavity; 63, mounting disc; 64, cover plate; 65, limiting screw; 66, limiting block assembly; 70, side drum body; 71, cylinder body. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] In order to solve the problem of high tire defective rate in the production of the forming drum for producing safety tires in the prior art, the present application provides a forming drum locking device and a forming drum.

[0030] Please refer to Figures 1 to 5 The forming drum locking device of the present application is mainly applied to the forming drum for producing safety tires, and the locking device comprises a rubber ring 11, an expansion mechanism 20 and a supporting mechanism 30. The rubber ring 11 is arranged around the main shaft 10. The rubber ring 11 has a certain elasticity. The expansion mechanism 20 is sleeved on the main shaft 10 and located on the inner side of the rubber ring 11, so as to jack up the rubber ring 11 along the radial direction of the main shaft 10 by expansion and contraction movement.

[0031] When the inner liner needs to be attached, the expansion and contraction mechanism 20 expands outward to push the rubber ring 11 to expand, so that the outer side of the rubber ring 11 is flush with the outer surface of the side drum body 70, ensuring that the inner liner will not be suspended during attachment, and the problems of poor attachment or wrinkles will not occur.

[0032] When the inner liner is attached, in order to increase the thickness of the side, support rubber needs to be attached at the rubber ring 11, at which time the expansion and contraction mechanism 20 needs to be contracted, and the rubber ring 11 is contracted inward under the elastic restoring force of itself to form a groove, which can accommodate the support rubber to increase the thickness of the side during the turning.

[0033] In addition, in order to avoid air bubbles at the toe of the green tire during the attachment of the material, the support mechanism 30 of the present application is sleeved on the main shaft 10 and located on the inner side of the rubber ring 11, wherein the support mechanism 30 is arranged on one side of the expansion and contraction mechanism 20 along the axial direction of the main shaft 10, and the support mechanism 30 is arranged to be expandable and contractable along the radial direction of the main shaft 10, so as to support the toe of the tire by jacking up the rubber ring 11 corresponding to the toe position, thereby avoiding the problem of air bubbles at the toe.

[0034] The expansion and contraction mechanism 20 includes a plurality of expansion and contraction plate assemblies and a driving assembly, the plurality of expansion and contraction plate assemblies are arranged around the main shaft 10 and are respectively movably extended and contracted along the radial direction of the main shaft 10; the driving assembly is respectively drivingly connected with the plurality of expansion and contraction plate assemblies to simultaneously drive the plurality of expansion and contraction plate assemblies to move.

[0035] The driving assembly includes a driving ring 21, which is a conical table structure with a through hole in the middle, the driving ring 21 is sleeved on the main shaft 10, one end of the inner side of the driving ring 21 is provided with a ring of protrusions, the protrusions are in sealing sliding connection with the main shaft 10, the driving ring 21 is movably sleeved on the main shaft 10 along the axial direction of the main shaft 10, wherein the outer side of the driving ring 21 is provided with a first inclined conical surface 211 which is arranged inclined to the radial direction of the main shaft 10, the plurality of expansion and contraction plate assemblies are arranged around the first inclined conical surface 211, and the driving ring 21 is moved to push each expansion and contraction plate assembly to move along the radial direction of the main shaft 10 through the first inclined conical surface 211.

[0036] The locking device further includes a first cavity 22 and a second cavity 23 respectively located on both sides of the axial direction of the driving ring 21, wherein the driving ring 21 is driven to move towards the direction close to the support mechanism 30 by inflating the first cavity 22 and exhausting the second cavity 23, or the driving ring 21 is driven to move away from the direction away from the support mechanism 30 by inflating the second cavity 23 and exhausting the first cavity 22.

[0037] The expansion and contraction mechanism 20 further comprises a guide sleeve 24 sleeved on the main shaft 10, the guide sleeve 24 can also be fixed on the cylinder barrel 71, the supporting plate 26, the guide sleeve 24 and the driving ring 21 are sequentially arranged from outside to inside along the radial direction of the main shaft 10, wherein the guide sleeve 24 is provided with a plurality of guide holes 241, the plurality of guide holes 241 are arranged in one-to-one correspondence with a plurality of guide rods 25 to be described below, wherein the guide holes 241 extend along the radial direction of the main shaft 10, and a plurality of expansion and contraction plate assemblies are movably inserted into the guide holes 241 to move along the extension direction of the guide holes 241.

[0038] The expansion and contraction plate assembly comprises the guide rod 25 and the supporting plate 26 arranged perpendicularly to each other, the guide rod 25 is slidably penetrated into the guide hole 241, wherein one end of the guide rod 25 is provided with a first inclined surface 251 for abutting against the first inclined conical surface 211, and the supporting plate 26 is perpendicularly arranged at the end of the guide rod 25 away from the first inclined conical surface 211 for abutting against the inner side of the rubber ring 11.

[0039] The expansion and contraction function of the rubber ring 11 is realized by the expansion and contraction mechanism 20 described above, and the specific implementation process is as follows:

[0040] A plurality of supporting plates 26 are uniformly distributed in the circumferential direction of the drum, and are connected to a plurality of guide rods 25 by screws, and the plurality of guide rods 25 pass through the guide sleeve 24 and cooperate with the driving ring 21. The main box gas circuit charges the first cavity 22, and the second cavity 23 discharges, the driving ring 21 axially slides towards the direction close to the cylinder barrel 71, drives the guide rod 25 to radially expand through the guide sleeve 24, and the plurality of supporting plates 26 radially expand to support the rubber ring 11. At this time, the outer cylindrical surface of the forming drum forms a complete cylinder, which can provide strong support when the inner lining layer is attached.

[0041] Conversely, the main box gas circuit charges the second cavity 23, and the first cavity 22 discharges, the driving ring 21 axially slides away from the cylinder barrel 71, drives the guide rod 25 to radially contract, and the guide rod 25 drives the supporting plate 26 to form a groove. Space is left for the tire side support rubber.

[0042] The locking device further comprises a limiting block assembly 66, which is adjustably arranged along the axial direction of the main shaft 10, so as to limit the movement range of the driving ring 21 by stopping the driving ring 21 from moving.

[0043] A plurality of limiting screws 65 and limiting block assemblies 66 are uniformly distributed in the circumferential direction of the drum, the limiting screws 65 are fixed on the limiting block assemblies 66, and the travel of the driving ring 21 is limited. The cover plate 64 is fixed on the mounting disc 63 by screws. When it is necessary to adjust the depth of the groove formed by the inward contraction of the rubber ring 11, the cover plate 64 screws are removed, the cover plate 64 is removed, and different lengths of limiting screws 65 are replaced, so that the axial travel of the driving ring 21 can be adjusted, and the depth of the groove is changed.

[0044] The support mechanism 30 comprises a plurality of support plate assemblies 31 arranged around the main shaft 10 and respectively telescopically movable along the radial direction of the main shaft 10 to support the toe of the tire by supporting the bead 11. The locking device further comprises a third cavity 311 and a fourth cavity 312 respectively located on both sides of the support plate assembly 31 in the radial direction of the main shaft 10, wherein the plurality of support plate assemblies 31 are simultaneously driven to move outward by inflating the third cavity 311 and exhausting the fourth cavity 312, or the plurality of support plate assemblies 31 are simultaneously driven to move close to the main shaft 10 by inflating the fourth cavity 312 and exhausting the third cavity 311.

[0045] The forming drum locking device further comprises a bead locking mechanism comprising a plurality of lock block assemblies 50 arranged around the main shaft 10 and respectively telescopically movable along the radial direction of the main shaft 10 to lock the bead of the tire by supporting the bead 11, wherein the inflation and contraction mechanism 20, the support mechanism 30 and the bead locking mechanism are sequentially arranged in the axial direction of the main shaft 10. The bead locking mechanism further comprises a piston 51 arranged on the main shaft 10 and telescopically movable in the axial direction of the main shaft 10, wherein the outer side of the piston 51 is provided with a second inclined conical surface 511 arranged obliquely to the radial direction of the main shaft 10, and the inner side of the lock block assembly 50 is provided with a second inclined surface 501 for abutting against the second inclined conical surface 511, and the piston 51 is moved to push each lock block assembly 50 to move along the radial direction of the main shaft 10 by the second inclined conical surface 511.

[0046] The operation principle of the above-mentioned support mechanism 30 and bead locking mechanism is as follows:

[0047] When the tire is inflated and formed, the piston 51 is axially slid to the direction close to the support plate assembly 31, the plurality of lock block assemblies 50 are radially expanded to lock the bead, the main box gas circuit is inflated to the third cavity 311 and exhausted to the fourth cavity 312, the plurality of support plate assemblies 31 are radially expanded to support the bead 11 and tightly adhere to the toe of the tire, and the toe of the tire can be supported to avoid bubbles during the forming process.

[0048] When the tire is inflated and formed, the piston 51 is axially slid to the direction close to the support plate assembly 31, the plurality of lock block assemblies 50 are radially expanded to lock the bead, the main box gas circuit is inflated to the third cavity 311 and exhausted to the fourth cavity 312, the plurality of support plate assemblies 31 are radially expanded to support the bead 11 and tightly adhere to the toe of the tire, and the toe of the tire can be supported to avoid bubbles during the forming process.

[0049] The forming drum locking device further comprises a stretching mechanism movably arranged on the main shaft 10, and connected with one end of the rubber ring 11 to drive the rubber ring 11 to stretch or shrink along the axial direction of the main shaft 10, wherein the stretching mechanism, the expansion and contraction mechanism 20 and the supporting mechanism 30 are arranged in sequence along the axial direction of the main shaft 10. The stretching mechanism comprises a telescopic sleeve 60 movably sleeved on the main shaft 10, wherein the locking device further comprises a fifth cavity 61 and a sixth cavity 62 respectively located on both sides of the axial direction of the telescopic sleeve 60, wherein the telescopic sleeve 60 is driven to move close to the expansion and contraction mechanism 20 to shrink the rubber ring 11 by inflating the fifth cavity 61 and exhausting the sixth cavity 62, or the telescopic sleeve 60 is driven to move away from the expansion and contraction mechanism 20 to stretch the rubber ring 11 by inflating the sixth cavity 62 and exhausting the fifth cavity 61.

[0050] According to one embodiment of the present application, the width direction of the rubber ring 11 can also be adjusted to adapt to the fitting of rubber materials of different widths, specifically:

[0051] The mounting disc 63 is fixed on the telescopic sleeve 60 by screws, the main box gas circuit inflates the fifth cavity 61 and exhausts the sixth cavity 62, the telescopic sleeve 60 drives the mounting disc 63 to axially slide towards the direction close to the cylinder body 71 of the air cylinder, and the axial width of the groove is reduced. At this time, the two side drums respectively slide towards the center, and a smaller over-sized size can be reached.

[0052] Conversely, the main box gas circuit inflates the sixth cavity 62 and exhausts the fifth cavity 61, the telescopic sleeve 60 drives the mounting disc 63 to axially slide away from the direction of the cylinder body 71 of the air cylinder, and the axial width of the groove is increased. The two side drums respectively slide away from the center, and the initial flat width size can be reached.

[0053] The present application also provides a forming drum comprising a main shaft 10, two side drum bodies 70 and two forming drum locking devices, wherein the two side drum bodies 70 are sequentially arranged on the main shaft 10, and the two forming drum locking devices are arranged at one end of the two side drum bodies 70 close to each other, and the forming drum locking device is the above-mentioned forming drum locking device.

[0054] In addition, the two side drum bodies 70 are movably arranged to respectively fit tires of different sizes.

[0055] The forming drum of the present application can not only make run-flat tires by arranging the above-mentioned forming drum locking device, but also make ordinary tires by supporting the rubber ring groove of the material through the expansion and contraction mechanism to only expand but not shrink, realizing the effect of one drum for multiple purposes.

[0056] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0057] The forming drum locking device of the application can realize the expansion and contraction of the rubber ring 11, provide support for the inner liner during the material sticking, and can also arrange the inner support assembly to avoid the bubble problem at the sub-port part, and the rubber ring 11 can advance and retreat along the axial direction of the main shaft 10 to adjust the length of the forming drum and reduce the over-sized size.

[0058] The forming drum locking device of the application controls the radial expansion and contraction of the rubber ring 11 by the cylinder and the driving ring 21, and the piston 51 and the locking block assembly 50 can also be replaced by a connecting rod or other mechanical devices.

[0059] The forming drum locking device of the application controls the advance and retreat of the rubber ring 11 by the cylinder to change the width of the rubber ring 11 and adjust the axial length of the locking head of the forming drum, and when the width is unchanged, a smaller over-sized size can be obtained.

[0060] The forming drum locking device of the application can control the stroke of the driving ring 21 by the limiting screw 65 without disassembling the drum, and then change the depth of the radial contraction of the rubber ring 11.

[0061] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of the features, steps, operations, devices, components and / or combinations thereof.

[0062] Unless otherwise specifically stated, the relative arrangements of parts and steps, numerical expressions, and numerical values set forth in these embodiments are not meant to limit the scope of the present application. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods and devices known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the techniques, methods and devices should be considered as part of the authorized specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0063] In the description of the application, it should be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0064] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0065] In addition, it should be noted that the use of "first", "second" and the like to define parts only facilitates the differentiation of corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the application.

[0066] The above only describes the preferred embodiments of the application and is not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the scope of protection of the application.

Claims

1. A molding drum locking device, characterized in that, include: A rubber ring (11) is arranged around the main shaft (10); An expansion and contraction mechanism (20) is sleeved on the main shaft (10) and located inside the rubber ring (11) to lift the rubber ring (11) by expansion and contraction movement in the radial direction of the main shaft (10); A support mechanism (30) is sleeved on the main shaft (10) and located inside the rubber ring (11). The support mechanism (30) is disposed on one side of the expansion and contraction mechanism (20) along the axial direction of the main shaft (10), and the support mechanism (30) is expandable and contractible along the radial direction of the main shaft (10) to support the toe of the tire.

2. The molding drum locking device according to claim 1, characterized in that, The expansion and contraction mechanism (20) includes: Multiple expansion and contraction plate assemblies are arranged around the main shaft (10) and are retractably movable in the radial direction of the main shaft (10); A driving component is provided, which is connected to a plurality of expansion and contraction plate assemblies to drive the plurality of expansion and contraction plate assemblies to move simultaneously.

3. The molding drum locking device according to claim 2, characterized in that, The driving component includes: A drive ring (21) is movably sleeved on the main shaft (10) along the axial direction of the main shaft (10). The outer side of the drive ring (21) is provided with a first oblique cone surface (211) that is inclined relative to the radial direction of the main shaft (10). A plurality of expansion and contraction plate assemblies are arranged around the first oblique cone surface (211). The drive ring (21) moves to push each of the expansion and contraction plate assemblies to move along the radial direction of the main shaft (10) through the first oblique cone surface (211).

4. The molding drum locking device according to claim 3, characterized in that, The locking device further includes a first cavity (22) and a second cavity (23) located on both sides of the drive ring (21) in the axial direction. The drive ring (21) is driven to move toward the support mechanism (30) by inflating the first cavity (22) and venting the second cavity (23), or the drive ring (21) is driven to move away from the support mechanism (30) by inflating the second cavity (23) and venting the first cavity (22).

5. The molding drum locking device according to claim 3, characterized in that, The expansion and contraction mechanism (20) further includes: A guide sleeve (24) is sleeved on the main shaft (10). The guide sleeve (24) is provided with a plurality of guide holes (241). The guide holes (241) extend in the radial direction of the main shaft (10). A plurality of expansion and contraction plate assemblies are movably inserted into the guide holes (241) to move in the extending direction of the guide holes (241).

6. The molding drum locking device according to claim 5, characterized in that, The expansion and contraction plate assembly includes a guide rod (25) and a support plate (26) arranged perpendicularly to each other. The guide rod (25) is slidably inserted into the guide hole (241). One end of the guide rod (25) is provided with a first inclined surface (251) for abutting against the first inclined cone surface (211). The support plate (26) is arranged perpendicularly at the end of the guide rod (25) away from the first inclined cone surface (211) for abutting against the inner side of the rubber ring (11).

7. The molding drum locking device according to claim 3, characterized in that, The locking device further includes: A limiting block assembly (66) is adjustablely disposed along the axial direction of the main shaft (10) to limit the range of movement of the drive ring (21) by stopping the movement of the drive ring (21).

8. The molding drum locking device according to claim 1, characterized in that, The support mechanism (30) includes: Multiple support plate assemblies (31) are arranged around the main shaft (10) and are retractably movable in the radial direction of the main shaft (10) to support the toe of the tire by supporting the rubber ring (11).

9. The molding drum locking device according to claim 8, characterized in that, The locking device further includes a third cavity (311) and a fourth cavity (312) located on both sides of the support plate assembly (31) in the radial direction of the main shaft (10), wherein multiple support plate assemblies (31) are driven to move outward simultaneously by inflating the third cavity (311) and venting the fourth cavity (312), or multiple support plate assemblies (31) are driven to move towards the main shaft (10) simultaneously by inflating the fourth cavity (312) and venting the third cavity (311).

10. The molding drum locking device according to claim 1, characterized in that, The molding drum locking device also includes a bead locking mechanism, which includes a plurality of locking block assemblies (50). The plurality of locking block assemblies (50) are arranged around the main shaft (10) and are retractably movable along the radial direction of the main shaft (10) to lock the tire bead by supporting the rubber ring (11). The expansion and contraction mechanism (20), the support mechanism (30) and the bead locking mechanism are arranged sequentially along the axial direction of the main shaft (10).

11. The molding drum locking device according to claim 10, characterized in that, The bead locking mechanism also includes: A piston (51) is sleeved on the main shaft (10) and movably disposed along the axial direction of the main shaft (10). The outer side of the piston (51) is provided with a second inclined cone surface (511) that is inclined relative to the radial direction of the main shaft (10). The inner side of the locking block assembly (50) is provided with a second inclined surface (501) for abutting against the second inclined cone surface (511). The piston (51) moves to push each of the locking block assemblies (50) along the radial direction of the main shaft (10) through the second inclined cone surface (511).

12. The molding drum locking device according to claim 1, characterized in that, The molding drum locking device also includes: A stretching mechanism is movably mounted on the main shaft (10). The stretching mechanism is connected to one end of the rubber ring (11) to drive the rubber ring (11) to extend and retract along the axial direction of the main shaft (10). The stretching mechanism, the expansion and contraction mechanism (20), and the support mechanism (30) are arranged sequentially along the axial direction of the main shaft (10).

13. The molding drum locking device according to claim 12, characterized in that, The stretching mechanism includes a telescopic sleeve (60) which is movably sleeved on the main shaft (10). The locking device further includes a fifth cavity (61) and a sixth cavity (62) located on both sides of the telescopic sleeve (60) in the axial direction. The telescopic sleeve (60) is driven to move closer to the expansion and contraction mechanism (20) to shrink the rubber ring (11) by inflating the fifth cavity (61) and venting the sixth cavity (62), or the telescopic sleeve (60) is driven to move away from the expansion and contraction mechanism (20) to stretch the rubber ring (11) by inflating the sixth cavity (62) and venting the fifth cavity (61).

14. A molded drum, characterized in that, It includes a main shaft (10), two side drum bodies (70) and two forming drum locking devices, wherein the two side drum bodies (70) are sequentially mounted on the main shaft (10), and the two forming drum locking devices are respectively located at the relatively close ends of the two side drum bodies (70), and the forming drum locking devices are the forming drum locking devices according to any one of claims 1 to 13.

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