CN209920573U - Rigid core and tire mold - Google Patents

Abstract

The utility model relates to a tire technical field, concretely and relate to rigidity core and tire mould. The rigid core includes a central mechanism, a plurality of first cores, a plurality of second cores, and a plurality of fixedly disposed first drive portions and a plurality of fixedly disposed second drive portions. The radial inner sides of the first mold core and the second mold core are movably connected with the central mechanism, the radial outer sides of the first driving part and the second driving part are provided with driving surfaces, and the radial inner sides of the first mold core and the second mold core are provided with matching surfaces; the drive face and/or the mating face being inclined radially outwardly; when in the open state, the first core and the second core are mutually staggered in the radial direction; when in the closed state, the first core and the second core enclose an annular structure, and the second core reaches the closed state before the first core.

Description

Rigid core and tire mold

Technical Field

The utility model relates to a tire technical field particularly, relates to a rigidity core and tire mould.

Background

The capsules currently used for vulcanizing vehicle outer tires are generally soft pneumatic capsules of rubber material, in addition to various mechanical hard capsules.

However, the rubber inflatable bladder is often replaced by other rigid hard capsules on high-grade tires due to various defects of uneven wall thickness, uneven movement stroke, uneven heat transfer and the like.

As one of the solving measures, the rigid hard mechanical capsule can solve the problems of uneven wall thickness, uneven heat transfer and the like; however, in the mold closing process of the existing rigid mechanical bladder, mutual collision and collision are easy to occur, and the problem of interference caused by difficulty in coordination of the mold closing action sequence is caused, so that the probability of failure of the mechanical bladder is high, the tire is out of round and runs out of rubber, and the quality of the tire is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rigidity core, it can improve among the prior art when vulcanizer cylinder stroke change is great, is difficult to the not problem in place of mechanical capsule compound die that the effective control leads to because of the stroke.

Another object of the present invention is to provide a tire mold including the above rigid core.

The embodiment of the utility model discloses a realize through following technical scheme:

a rigid core, comprising:

the core mechanism comprises a center mechanism, a plurality of first cores, a plurality of second cores, a plurality of fixedly arranged first driving parts and a plurality of fixedly arranged second driving parts;

the first mold cores and the second mold cores are the same in quantity, and are uniformly distributed in the circumferential direction and sequentially arranged at intervals; the bottom of the first core and the bottom of the second core are both configured to be movably arranged on the base along the radial direction of the base of the tire mold;

the first driving parts are the same in number and correspond to the first cores one by one, and the second driving parts are the same in number and correspond to the second cores one by one;

the radial outer side of the first driving part and the radial outer side of the second driving part are both provided with driving surfaces, the radial inner side of the first mold core and the radial inner side of the second mold core are both provided with matching surfaces, the driving surfaces are matched with the matching surfaces, and the driving surfaces and/or the matching surfaces are obliquely arranged;

the rigid mold core has an open state and a closed state;

when in the open state, the first core and the second core are mutually staggered in the radial direction;

the first core and the second core are arranged in a ring-shaped configuration when in the closed state;

the second core has a drive surface with a drive structure that allows the second core to reach a closed position in a closed state before the first core.

By adopting the mode to open and close the die, the die structure is more stable; meanwhile, the rigid mold core is driven without a complex mechanical structure, and a complex driving mechanism of the vulcanizing machine is not required to act, so that the space is saved, and the equipment cost is reduced. The rigid mold core is simple in structure, convenient to operate, capable of obviously improving the efficiency of the tire mold, convenient to manufacture and beneficial to large-scale flow line production.

In an embodiment of the present invention:

the central mechanism comprises a first mechanism, a second mechanism and an intermediate elastic piece;

the second mechanism is arranged above the first mechanism, and the first mechanism and the second mechanism are axially connected through an intermediate elastic piece;

the first connecting mechanism is movably connected with the first mechanism, and the second connecting mechanism is movably connected with the second mechanism;

preferably, the intermediate elastic member is a compression spring.

In an embodiment of the present invention:

two ends of the first connecting mechanism are movably connected with the first mold core and the central mechanism respectively; the second connecting mechanism comprises a second stretching elastic piece, and two ends of the second connecting mechanism are movably connected with the second core and the central mechanism respectively;

the connecting position of the second connecting mechanism and the central mechanism is higher than that of the first connecting mechanism and the central mechanism;

and/or the first connecting mechanism comprises a first stretching elastic piece, and two ends of the first connecting mechanism are movably connected with the first mold core and the central mechanism respectively; the second connecting mechanism comprises a second stretching elastic piece, and two ends of the second connecting mechanism are movably connected with the second core and the central mechanism respectively; preferably, the first tensile elastic member and the second tensile elastic member are both tension springs.

In an embodiment of the present invention:

the first connecting mechanism further comprises a first connecting part arranged on the inner side of the first mold core, the first connecting part comprises first connecting holes arranged along the axial direction, one end of a first stretching elastic piece is movably connected with any one first connecting hole, and the other end of the first stretching elastic piece is movably connected with the central mechanism;

the second connecting mechanism further comprises a second connecting part arranged on the inner side of the second mold core, the second connecting part comprises second connecting holes arranged along the axial direction, one end of a second stretching elastic piece is movably connected with any one of the second connecting holes, and the other end of the second stretching elastic piece is movably connected with the central mechanism;

preferably, the first connecting mechanism further comprises a first matching part arranged on the central mechanism, the first matching part comprises first matching holes arranged along the axial direction, one end of the first stretching elastic piece is movably connected with any one of the first connecting holes, and the other end of the first stretching elastic piece is movably connected with any one of the first matching holes;

preferably, the second connecting mechanism further comprises a second matching part arranged on the central mechanism, the second matching part comprises second matching holes arranged along the axial direction, one end of the second stretching elastic piece is movably connected with any one of the second connecting holes, and the other end of the second stretching elastic piece is movably connected with any one of the second matching holes;

preferably, the height of the first mating hole is higher than the height of the second mating hole.

In an embodiment of the present invention:

the first connecting mechanism comprises a first hinge mechanism, and two ends of the first hinge mechanism are movably connected with the first mold core and the central mechanism respectively;

and/or the second connecting mechanism comprises a second hinge mechanism, and two ends of the second hinge mechanism are movably connected with the second core and the central mechanism respectively.

In an embodiment of the present invention:

the inclination angle of the driving surface of the second driving part is larger than that of the driving surface of the first driving part, so that the second core reaches the closed state before the first core.

In an embodiment of the present invention:

the second driving part comprises a body and a front driving bulge, the front driving bulge is arranged at the bottom of the body, and the front driving bulge extends outwards in the radial direction; the surfaces of the leading projections and the surfaces of the body together form drive surfaces to cause the second core to reach a closed condition before the first core.

In an embodiment of the present invention:

one side of the second core close to the driving surface of the second driving part is provided with a vertical downward sliding groove; when the front drive lug is in a closed state, the front drive lug is embedded and matched with the sliding groove.

In an embodiment of the present invention:

when the mold is closed, the lower outer side of the second driving part pushes the matching surface of the inner side of the second mold core to move outwards in the radial direction; the second core is provided with a matching surface matched with the second driving part;

preferably, the inclination angle of the portion of the mating face of the second core is larger than the inclination angle of the mating face of the first core, and the inclination angle of the upper portion of the mating face inside the second core is larger than the inclination angle of the lower portion of the mating face, so that the second core reaches the closed state before the first core.

In an embodiment of the present invention:

the rigid mold core further comprises a radial guide mechanism;

the first core and the second core are slidably connected to the guide mechanism, respectively, in a radial direction of the base.

In an embodiment of the present invention:

the radial guide mechanism comprises a hinge seat and a pin shaft;

the hinge seat is provided with a sliding groove extending along the radial direction of the tire mold base;

the first mold core and the second mold core are slidably arranged in the sliding groove through the pin shaft respectively.

In an embodiment of the present invention:

the rigid core also comprises an adjusting device; the adjusting device comprises an adjusting bolt and a first elastic piece; the first elastic piece is sleeved on the screw rod of the adjusting bolt;

when the first driving part and the second driving part are both detachably connected with the upper cover, the adjusting bolt is arranged between the first driving part and the upper cover, and the adjusting bolt is arranged between the second driving part and the upper cover;

when the above-mentioned first drive portion and second drive portion are both detachably connected with the upper side plate, the adjusting bolt is provided between the first drive portion and the upper cover, and the adjusting bolt is provided between the second drive portion and the upper cover.

The embodiment of the utility model provides a beneficial effect is:

the utility model provides a cooperation that rigid core passes through first core and first drive division to and the cooperation of second core and second drive division has realized the compound die of mould, and makes the second core reach the closure state earlier than first core, thereby has ensured that rigid core can reach the closure state steadily in order to accomplish the compound die, and has avoided interference and collision. The first core and the second core are mutually staggered in the radial direction to reach an opening state through mutual cooperation of the center mechanism, the first connecting mechanism and the second connecting mechanism so as to complete mold opening. Thus, the rigid core solves the problem that the rigid core cannot be closed due to incomplete opening and return interference in the prior art. By adopting the mode to open the die, the die structure is more stable; meanwhile, the rigid mold core is driven without a complex mechanical structure, and a complex driving mechanism of the vulcanizing machine is not required to act, so that the space is saved, and the equipment cost is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a closed state of a tire mold according to an embodiment of the present invention;

fig. 2 is a top view structural diagram of a ring mechanism in a closed state of a core of a tire mold according to an embodiment of the present invention;

fig. 3 is a schematic view of an open state of a tire mold according to an embodiment of the present invention;

fig. 4 is a top view structural view of a core open state of a tire mold according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a core provided in an embodiment of the present invention;

fig. 6 is a schematic structural view of a hinge seat portion provided in an embodiment of the present invention;

fig. 7 is another schematic structural diagram of a hinge base portion according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an adjusting device according to an embodiment of the present invention;

fig. 9 is a schematic view of the fitting surfaces of different cores having different inclination angles according to the second embodiment of the present invention;

fig. 10 is a first structural schematic view of a second core according to a third embodiment of the present invention;

fig. 11 is a second structural schematic diagram of a second core according to a third embodiment of the present invention;

fig. 12 is a schematic structural diagram of a center mechanism according to a fourth embodiment of the present invention.

Icon: 10-a rigid core; 100-a central mechanism; 110 — a first mechanism; 111-a first recess; 120-a second mechanism; 121-a first protrusion; 130-a connecting rod; 140-an intermediate elastic member; 210-a first core; 220-a second core; 222-a sliding groove; 310-a first tensile elastic member; 320-a second tensile elastic; 410-a first drive; 420-a second drive section; 422-precursor bump; 430-a drive face; 431-mating face; 441-a first inclined segment; 442-a second inclined section; 500-a regulating device; 510-adjusting bolts; 520-a first elastic member; 530-mounting holes; 601-connecting hole; 602-mating holes; 611-a first connection; 612-a first mating portion; 621-a second connecting portion; 622-second mating portion; 710-a hinge mount; 711-a chute; 720-pin shaft; 20-a tire mold; 21-upper cover; 22-a base; 23-upper side plate; 24-lower side plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, the description is only for convenience of description and simplification, but the indication or suggestion that the device or element to be referred must have a specific position, be constructed and operated in a specific position, and thus, cannot be understood as a limitation of the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed" and "mounted" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

Fig. 1 is a schematic structural view of a closed state of a tire mold 20 according to an embodiment of the present invention, and fig. 2 is a top structural view of a ring mechanism in a core closed state; fig. 3 is a schematic view of an open state of a tire mold 20 according to an embodiment of the present invention, and fig. 4 is a top view structural view of a core open state;

referring to fig. 1 to 4, a rigid core 10 is shown, which includes a center mechanism 100, a plurality of first cores 210, a plurality of second cores 220, a plurality of fixedly disposed first driving portions 410 and a plurality of fixedly disposed second driving portions 420.

The number of the first cores 210 is the same as that of the second cores 220, and the first cores 210 and the second cores 220 are circumferentially uniformly distributed and sequentially arranged at intervals; the bottom of first core 210 and the bottom of second core 220 are each configured to be movably disposed on base 22 in a radial direction of base 22 of tire mold 20;

the first driving parts 410 are the same in number and correspond to the first cores 210 one by one, and the second driving parts 420 are the same in number and correspond to the second cores 220 one by one;

the radial outer side of the first driving part 410 and the radial outer side of the second driving part 420 are respectively provided with a driving surface 430, the radial inner side of the first core 210 and the radial inner side of the second core 220 are respectively provided with a matching surface 431, the driving surface 430 is matched with the matching surface 431, and the driving surface 430 and/or the matching surface 431 are obliquely arranged, so that the first core 210 and the second core 220 can move outwards in the radial direction through the action of the driving surface 430 and the matching surface 431 in the mold closing process;

the rigid core 10 has an open state and a closed state;

when in the open state, the first core 210 and the second core 220 are offset from each other in the radial direction;

when in the closed state, the first core 210 and the second core 220 are arranged in a ring-shaped configuration;

specifically, when the open state is transited to the closed state, the first driving portion 410 and the first core 210 are engaged with each other, and the second driving portion 420 and the second core 220 are engaged with each other, so that the first core 210 and the second core 220 are radially outwardly moved and arranged in an annular structure centering on the center mechanism 100;

the driving surface 430 of the second core 220 has a driving structure thereon, so that the second core 220 reaches a closed position in a closed state before the first core 210.

The "inclination" of the "driving surface 430 and/or the engagement surface 431 are obliquely arranged" means that the cross section in the axial direction (i.e., the extending direction of the center mechanism 100) is inclined.

Specifically, as shown in fig. 1, the radially inner side of the driving surface 430 of the driving portion (the first driving portion 410 and the second driving portion 420) is a vertical plane, and the radially outer side is disposed obliquely. Further, the radially outer side of the core gradually decreases in cross section in the direction from the upper cover 21 to the base 22.

Accordingly, the mating surfaces 431 of the cores (the first core 210 and the second core 220) are arranged in a vertical plane on the radially outer side and in an inclined manner on the radially inner side. Further, the cross section of the radially outer side of the core gradually increases in the direction from the upper cover 21 to the base 22.

It will be appreciated that the drive surface 430 and/or the mating surface 431 may also be tapered here. As long as the driving surface 430 and the mating surface 431 can be mated with each other to achieve the closed position in which the second core 220 reaches the closed state earlier than the first core 210.

It should be noted that, in the present embodiment, by the center mechanism 100, not only the closed position where the two cores reach the closed state earlier than the first core 210 can be realized, but also the first core 210 can be opened earlier than the second core 220. Specifically, how the above-described functions are realized by the center mechanism 100 will be described in detail later.

Please continue to refer to fig. 1 to 8 for further structural details.

In this embodiment, the drive face 430 and the mating face 431 are both inclined radially outwardly. It will be appreciated that in other embodiments, the drive surface 430 may simply be inclined radially outwardly or the engagement surface 431 may be inclined radially outwardly, as long as the second core 220 reaches the closed condition before the first core 210.

As can be seen from the figure, in the present embodiment, the first driving portion 410 and the second driving portion 420 are detachably disposed on the upper side plate 23 of the mold by bolts, and the upper side plate 23 is connected to the upper cover 21. In other embodiments, the first and second driving parts 410 and 420 may be directly provided on the upper cap 21 as long as the driving parts are fixedly provided to cooperate with the cores to bring the second cores 220 into the closed state first.

The first mold core 210 and the second mold core 220 preferably have the same central included angle, which is beneficial to the design and manufacture of blanks, and the difference between the two is that the included angles of the contact surfaces on the two sides are different; the angle between the side of the first core 210 and the central plane of the outer peripheral surface of the second core 220 is 0 ° or more, preferably 0 to 30 °. The side of the second core 220 is engaged with the side of the first core 210.

Optionally, the rigid core 10 further comprises a plurality of reinforcing structures; reinforcing structures are provided on the cores to ensure that the cores (the first core 210 and the second core 220) are as lightweight as possible with sufficient support.

As can also be seen in the figure, alternatively, the number of the first cores 210 is the same as the number of the second cores 220, and the first cores 210 are sequentially spaced apart from the second cores 220. When in the open state, the first core 210 and the second core 220 are mutually offset in the radial direction of the rigid core 10; when in the closed state, the plurality of first cores 210 and the plurality of second cores 220 are arranged in an annular configuration centered on the center mechanism 100.

In this embodiment, the driving surface 430 is a bevel, and the driving surface 430 is used to move the cores (including the first core 210 and the second core 220, the same applies below) radially outward, thereby driving the first core 210 and the second core 220 to be closed, i.e., to reach a closed state. The inclination angle (angle from the vertical) of the inclined surface is preferably any one of 10 °, 15 °, 18 ° and 20 °.

Alternatively, the shape of the first and second driving parts 410 and 420 is preferably a trapezoidal shape, and the slope serves as a main structure of the driving core. The first driving parts 410 and the second driving parts 420 are equal in number and are circumferentially arranged at intervals; the number may be 2-10, preferably 3-5.

The second driving part 420 may be such that the second driving part 420 can drive the second core 220 to the preset mold clamping position (closed state) in advance when the two driving parts (the first driving part 410 and the second driving part 420) make driving movements downward at the same time, as compared to the first driving part 410. This may be accomplished by providing different angles for the drive surfaces 430, or by providing different radial positions for the first and second drive members 420, in combination with different drive surface 430 shapes.

In the present embodiment, the radial positions of the first driving portion 410 and the second driving portion 420 are the same, which facilitates the processing and assembling. Further, the second driving part 420 includes a body and a front protrusion 422, the front protrusion 422 is disposed at the bottom of the body, and the front protrusion 422 extends radially outward; the surface of the precursor projection 422 and the surface of the body together form a drive surface 430 to cause the second core 220 to reach a closed condition before the first core 210.

In the present embodiment of the invention, a vertically downward sliding groove 222 is formed on a side of the second core 220 close to the driving surface 430 of the second driving part 420; when in the closed state, the front protrusion 422 is engaged with the sliding groove 222 to form a closed curved surface. Such that when the mold is in a closed condition, the first core 210 and the second core 220 move radially outwardly into an annular configuration centered on the centering mechanism 100 such that the outermost turn of the annular configuration forms a closed curved surface closely fitting the tread of the tire.

The front driving protrusion 422 may cause the first driving part 410 and the second driving part 420 to simultaneously drive the cores downward, so that the second driving part 420 contacts the second core 220 in advance, and drives the second core 220 to move, thereby preventing the first core 210 and the second core 220 from colliding with each other when moving. The protrusion height of the front protrusion 422 is the same as the difference in the opening sliding stroke of the first core 210 and the second core 220, and in connection with the structure of the second core 220, the second core 220 is provided with a sliding groove 222 at a position corresponding to the front protrusion 422, and the sliding groove 222 is preferably a vertical groove, and may be a diagonal groove having a small inclination. The control is more convenient and easier to process through the front driving projection 422.

When the front-driving protrusion 422 falls, it first contacts with the mating surface 431 of the second core 220 to push the second core 220 to move outward, and then enters the sliding groove 222 to directly push the second core 220 to the mold closing position of the second core 220 in the closed state. At this time, closing the first driving portion 410 will continue to move the first core 210 gradually outward along the mating surface 431 of the first core 210, so that the second core 220 is moved to the mold closing position first, and the first core 210 is moved to the mold closing position later, thereby avoiding interference between the two cores during the mold closing movement, and avoiding or reducing friction and even abrasion of the two cores during the mold closing movement.

Alternatively, the front protrusion 422 may be disposed at an upper portion of the second core 220, and the driving surface 430 of the second driving part 420 may be provided with the sliding groove 222.

Further, the center mechanism 100 includes a first mechanism 110, a second mechanism 120, and an intermediate elastic member 140; the second mechanism 120 is disposed above the first mechanism 110, and the first mechanism 110 and the second mechanism 120 are axially (in the axial direction of the mold, i.e., the extending direction of the center mechanism 100, the same applies hereinafter) connected by an intermediate elastic member 140; the radial inner side of the first core 210 is movably connected with the central mechanism 100 through a first connecting mechanism, and the radial inner side of the second core 220 is movably connected with the central mechanism 100 through a second connecting mechanism; the first linkage is movably coupled to the first mechanism 110 and the second linkage is movably coupled to the second mechanism 120. When in the open state, the centering mechanism 100, the first connecting mechanism and the second connecting mechanism interact to displace the first core 210 and the second core 220 from each other in a radial direction.

It should be noted that in the present embodiment, the connecting mechanism (including the first connecting mechanism and the second connecting mechanism) is rotatably connected to the movable connecting mechanism of the core, as follows. In other embodiments, the connection mechanism and the core may be connected in other manners as long as the above-described functions are achieved.

Alternatively, in other embodiments, the first mechanism 110 and the second mechanism 120 are integrally connected.

When the mold is opened, the first mechanism 110 moves upwards along the axis direction, and the first mechanism 110 drives the first mold core 210 to move inwards in the radial direction through the first connecting mechanism; the first mechanism 110 continues to move upward along the axial direction, because of the buffering effect of the intermediate elastic element 140, after the first mechanism 110 moves a predetermined distance, the second mechanism 120 moves upward along the axial direction, and at this time, the second mechanism 120 drives the second core 220 to move radially inward through the second connecting mechanism. Therefore, the first mold core 210 completes mold opening compared with the second mold core 220, the mold core is ensured to be opened step by step, and the problem of unsmooth capsule mold opening in the prior art is solved. It is understood that in other embodiments of the present invention, the change in mold opening sequence may be accomplished by coupling the first core 210 with the second mechanism 120 and coupling the second core 220 with the first mechanism 110.

Specifically, the center mechanism 100 further includes a connecting rod 130. A first concave hole 111 is formed at the end of the first mechanism 110, the second mechanism 120 is provided with a first protrusion 121, one end of the connecting rod 130 is arranged at the bottom of the first concave hole 111, and the first protrusion 121 is movably arranged at the other end of the connecting rod 130 in a penetrating manner; the middle elastic member 140 is sleeved on the connecting rod 130, and the first protrusion 121 abuts against the first concave hole 111 through the middle elastic member 140; the intermediate elastic member 140 is configured to provide an elastic force that moves the first protrusion 121 and the first concave hole 111 away from each other.

Preferably, the first mechanism 110 and the second mechanism 120 are axially connected by an intermediate elastic member 140;

preferably, the intermediate elastic member 140 is a spring. In the present embodiment, the intermediate elastic member 140 is a compression spring. In the present embodiment of the present invention, two ends of the first connecting mechanism are movably connected to the first core 210 and the central mechanism 100, respectively; the second connecting mechanism comprises a second stretching elastic element 320, and two ends of the second connecting mechanism are movably connected with the second core 220 and the central mechanism 100 respectively;

the connection position of the second connection mechanism to the center mechanism 100 is higher than the connection position of the first connection mechanism to the center mechanism 100;

and/or the first connecting mechanism comprises a first stretching elastic piece 310, and two ends of the first connecting mechanism are movably connected with the first mold core 210 and the central mechanism 100 respectively; the first tensile elastic member 310 is configured to provide a tensile force, preferably an elastic force, that moves the first core 210 toward the center mechanism 100;

the second connecting mechanism comprises a second stretching elastic element 320, and two ends of the second connecting mechanism are movably connected with the second core 220 and the central mechanism 100 respectively; the second tensile elastic member 320 is configured to provide a pulling force, preferably an elastic force, that moves the second core 220 toward the center mechanism 100.

The first tensile elastic member 310 provides an elastic force that always moves the first core 210 toward the center mechanism 100, and the second tensile elastic member 320 provides an elastic force that always moves the second core 220 toward the center mechanism 100. Under the action of the first and second tensile elastic members 310 and 320,

further, the first tensile elastic member 310 and the second tensile elastic member 320 are both tensile springs. It is understood that the first and second elastic members 310 and 320 may have other structures as well, and it is only necessary that the first elastic member 310 has a pulling elastic force to pull the core toward the center mechanism 100, which is merely an example.

Further, in the present embodiment of the present invention, the first connecting mechanism further includes a first connecting portion 611 disposed inside the first core 210, the first connecting portion 611 includes a first connecting hole 601 axially arranged (along the axial direction of the mold, i.e. the extending direction of the central mechanism 100, the same applies hereinafter), one end of the first elastic stretching member 310 is movably connected to any one of the first connecting holes 601, and the other end of the first elastic stretching member 310 is movably connected to the central mechanism 100. By adjusting the connection of the first stretch elastic member 310 to any one of the plurality of first connection holes 601, the first stretch elastic member 310 has a different stretch elastic force to pull the first core 210 toward the center mechanism 100. It should be noted that the connection of the first elastic member 310 to the center mechanism 100 is rotatable or pivotal.

The second connecting mechanism further includes a second connecting portion 621 provided inside the second core 220, the second connecting portion 621 includes second connecting holes 601 arranged in an axial direction (in an axial direction of the mold, i.e., an extending direction of the core mechanism 100, the same applies below), one end of the second tensile elastic member 320 is movably connected to any one of the second connecting holes 601, and the other end of the second tensile elastic member 320 is movably connected to the core mechanism 100. By adjusting the connection of the second stretching elastic member 320 to any one of the plurality of second connection holes 601, the second stretching elastic member 320 has a different stretching elastic force to pull the second core 220 toward the center mechanism 100. It should be noted that the connection of the second elastic stretching member 320 to the central mechanism 100 is rotatable or pivotal.

As can be seen from the figure, further, the first connecting mechanism further includes a first fitting portion 612 provided on the first mechanism 110, the first fitting portion 612 includes first fitting holes 602 arranged in the axial direction (in the axial direction of the mold, i.e., the extending direction of the central mechanism 100, the same applies hereinafter), one end of the first elastic stretching member 310 is movably connected to any one of the first connecting holes 601, and the other end of the first elastic stretching member 310 is movably connected to any one of the first fitting holes 602. By adjusting the attachment of the first tensile elastic member 310 to any of the plurality of first mating holes 602, the first tensile elastic member 310 has a different tensile force to pull the first core 210 toward the center mechanism 100.

Further, the second connecting mechanism further includes a second matching portion 622 disposed on the second mechanism 120, the second matching portion 622 includes second matching holes 602 disposed along the axial direction (along the axial direction of the mold, i.e. the extending direction of the central mechanism 100, the same applies below), one end of the second stretching elastic member 320 is movably connected with any one of the second connecting holes 601, and the other end of the second stretching elastic member 320 is movably connected with any one of the second matching holes 602. By adjusting the connection of the second elastic member 320 to any one of the plurality of second engaging holes 602, the second elastic member 320 has a different elastic force to pull the second core 220 toward the central mechanism 100.

Preferably, the height of the first mating hole 602 is higher than the height of the second mating hole 602. With this arrangement, when the center mechanism 100 is raised, the first core 210 can be pulled back to open the mold.

The connecting hole 601 and the matching hole 602 are matched with each other to adjust the position of the stretching elastic element, so that the conditions that the pulling force on the core (the first core 210 and the second core 220) is too large and too small caused by different strokes of the cylinder or overtravel during the movement of the cylinder are better adapted, and the problems of forced stretching, impact and the like of the first core 210 and the second core 220 under the abnormal movement condition of the cylinder are protected, so that the precision of the core is not damaged.

Further, in other embodiments of the present invention, the first connecting mechanism includes a first hinge mechanism, and two ends of the first hinge mechanism are movably connected to the first core 210 and the central mechanism 100, respectively; and/or the second connecting mechanism comprises a second hinge mechanism, and two ends of the second hinge mechanism are movably connected with the second core 220 and the central mechanism 100 respectively.

Specifically, the central mechanism 100 is an integral water cylinder ring seat, and the first connecting mechanism and the second connecting mechanism are respectively hinged to the water cylinder ring seat (as in the solution of patent document No. 201710103482.7). The first core 210 has a first through hole, and the first hinge mechanism is movably disposed in the first through hole by a pin 720, and moves in a radial direction along an extending direction of the first through hole; the second core 220 has a second through hole, and the second hinge mechanism is movably disposed in the second through hole by a pin 720, and moves radially along the extending direction of the second through hole. The first core 210 and the second core 220 are staggered in the radial direction when the mold is in the open state due to the different through holes and the different pin 720.

It should be noted that, in other embodiments of the present invention, the first connecting mechanism and the second connecting mechanism may both be elastic members, and the first connecting mechanism and the second connecting mechanism may both be hinge structures; or one of the first connecting mechanism and the second connecting mechanism is a hinge structure, and the other is an elastic member structure, as long as the first core 210 and the second core 220 are staggered in the radial direction when the mold is in the open state.

As can also be seen, in other embodiments of the present invention, the inclination angle of the driving surface 430 of the second driving part 420 is greater than the inclination angle of the driving surface 430 of the first driving part 410, so that the second core 220 reaches the closed state before the first core 210. Such that when in the closed condition, the first core 210 and the second core 220 move radially outwardly into an annular configuration centered on the centering mechanism 100, the outermost turn of the annular configuration forming a closed curve that closely matches the tread of the tire, and the second core 220 reaching the closed condition before the first core 210.

Further, the rigid core 10 also comprises radial guide means; the first core 210 and the second core 220 are slidably coupled with the guide mechanisms, respectively, in a radial direction of the base 22.

Optionally, in this embodiment of the present invention, the radial guiding mechanism includes a hinge seat 710 and a pin 720; the hinge base 710 includes a slide groove 711 extending in the radial direction of the base 22 of the tire mold 20; the first core 210 and the second core 220 are slidably disposed in the slide groove 711 by a pin 720, respectively. Therefore, the movement of the core in the radial direction is more stable and reliable.

The first mold core 210 and the second mold core 220 are assembled with pin shafts 720 and slide in the slide grooves 711 on the hinge base 710, the width of the working groove of the hinge base 710 can limit the left and right deflection of the mold cores (the first mold core 210 and the second mold core 220) during movement, a platform designed at the bottom of the hinge base 710 is in clearance fit with the bottom of the mold core, the clearance is designed to be 0.05-0.15mm, and the up and down swing of the mold cores (the first mold core 210 and the second mold core 220) during movement can be limited, so that the mold cores can only move along an axial straight line.

Further, in order to solve the disadvantages of low heating efficiency and uneven heating of the rubber bladder, the core (the first core 210 and the second core 220) may be designed with a structure such as a steam chamber or holes for other heating methods, so that the rigid core can directly heat the tire blank; the heat exchange efficiency is improved, and the manufacturing cost of the tire is saved. The steam chamber is preferably formed by drilling holes, and the holes are communicated with each other so that hot steam can be introduced to heat the tire; a thermocouple can also be installed for heating.

The first and second driving parts 410 and 420 are connected to the upper side plate 23 (or the upper cover 21) of the mold, respectively, and the first and second driving parts 410 and 420 can be raised or lowered with the mold. The pressure and/or the stroke of the hydraulic cylinder of the mold are not completely consistent every time the vulcanizing machine opens and closes, so that the first core 210 and the second core 220 are excessively driven to be damaged by the first driving part 410 and the second driving part 420 due to the stroke overtravel; or the first and second driving parts 410 and 420 do not have enough strokes to completely drive the first and second cores 210 and 220 to the closed state.

In order to improve the above problem, an adjusting device 500 is installed between the driving part (including the first and second driving parts 410 and 420) and the upper side plate 23 or the upper cover 21, the adjusting device 500 can perform a fine adjustment function on the stroke of the driving part, and can prevent the cores (including the first and second cores 210 and 220) from being excessively pressed and deformed when the driving part exceeds the stroke.

Further, in the present embodiment of the present invention, the rigid core 10 further includes an adjusting device 500; the adjusting device 500 includes an adjusting bolt 510 and a first elastic member 520; the first elastic member 520 is fitted over the screw of the adjusting bolt 510. Optionally, in this embodiment, the upper ends of the first driving part 410 and the second driving part 420 are provided with mounting holes 530. The adjusting device 500 is disposed in the mounting hole 530, and the adjusting bolt 510 is used to abut the first elastic member 520 on the upper cover 21. It should be noted that, in other embodiments, the mounting hole 530 may be disposed on the upper side plate 23.

Optionally, the first elastic member 520 is a compression spring or a belleville spring, and the ascending adjustment function is achieved by adjusting the tightness of the bolt 510. The elastic piece can ensure the stable operation of the opening and closing processes of the die.

The beneficial effects of the first elastic member 520 (compression spring or belleville spring) include: the driving plates (the first driving part 410 and the second driving part 420) can be accurately positioned and installed; secondly, the stroke and the driving force for closing the first driving part 410 and the second driving part 420 can be compensated when the stroke of the vulcanizing machine is changed, so that the closing effect of the first mold core 210 and the second mold core 220 is good; thirdly, the compression of the spring can protect the first and second cores 210 and 220 from being pressed excessively when the first and second driving parts 410 and 420 are closed, so as not to damage and deform the first and second cores 210 and 220.

When the vulcanizing machine cylinder moves upwards, the first mechanism 110 is driven to move upwards, the stretching elastic piece is pulled to enable the first mold core 210 to contract inwards firstly, a gap is formed between the first mold core 210 and the second mold core 220, the vulcanizing machine cylinder continues to move upwards, the middle elastic piece 140 in the first mechanism 110 is stressed to drive the second mechanism 120 to move upwards synchronously, and the second mechanism 120 drives the stretching elastic piece to pull the second mold core 220 to contract inwards; the different movement sequences of the first mechanism 110 and the second mechanism 120 ensure that the first mold core 210 and the second mold core 220 move in the same sequence, and avoid the interference and collision between the first mold core and the second mold core.

After the vulcanization work is finished, the vulcanizing machine moves upwards to open the mold; meanwhile, the first driving portion 410 and the second driving portion 420 are driven to move upwards, and at this time, contact surfaces of different included angles at two sides of the first mold core 210 and the second mold core 220 are in a mutually balanced state under the compression of the contraction force of the tire, and do not move. Then, the central cylinder of the vulcanizing machine moves upwards to drive the first mechanism 110 and the second mechanism 120 to drive the first mold core 210 and the second mold core 220 to contract inwards to a state (namely an opening state) smaller than the inner diameter of the tire, so that the tire can be taken out smoothly; in this state, the green tire of the new tire can be relatively easily loaded. And then the central cylinder moves downwards to drive the first mechanism 110 and the second mechanism 120 to move downwards, and the stretching elastic piece is changed into a loose state from a tensioned state, so that the forced movement of the first mold core 210 and the second mold core 220 is not caused, and the original contraction state is maintained. When the mold descends to enter a contraction state, the first driving part 410 and the second driving part 420 drive and expand the first core 210 and the second core 220 before the mold is closed, the boss is driven in advance at the end of the second driving part 420, so that the second core 220 moves outwards before the first core 210, the mold continues to descend, the first driving part 410 contacts the first core 210 again, and at the moment, the first core 210 and the second core 220 can move synchronously; at this time, the driving boss on the second driving part 420 is closed to slide into the sliding groove 222 of the second core 220, preventing the second core 220 from being damaged. After the first core 210 and the second core 220 are restored to the annular state, the tire blank is spread (i.e. closed state); when the mold is fully closed, the tire enters a state of vulcanization production.

The embodiment of the utility model provides a beneficial effect is:

1. the stretching elastic piece is used as a driving piece, has larger stroke change, has buffer effect in movement, and can better adapt to the unstable stroke state of the movement of the cylinder of the vulcanizing machine; the phenomenon that the rubber leakage phenomenon occurs when the closing precision is influenced because the mold core is damaged due to forced stretching when the stroke of the rigidly connected cylinder exceeds the specified stroke is avoided. The elastic piece can ensure the stable operation of the opening and closing processes of the die.

2. The inner space of the mold core is large, the rigidity of the mechanical structure is sufficient, a temperature measuring device can be arranged, and the vulcanization temperature and time can be better adjusted.

3. The utility model discloses do not change by a wide margin current vulcanizer and mould, better be applicable to all kinds of steamer formulas, hot plate formula vulcanizer and mould, the transformation cost and the cycle of reducible mould and vulcanizer are applied to production fast.

4. An adjusting device 500 can be arranged between the connection of the driving parts (the first driving part 410 and the second driving part 420) and the upper side plate 23 or the upper cover 21, and the pressure of the vulcanizing machine can be adjusted when changed, so that the damage of insufficient stroke or overtravel stroke to the mold core is avoided.

5. The hinge seat 710 is used as an important connecting part and also has the functions of guiding and positioning, and the phenomenon that the core swings when moving to cause the gap tolerance of individual vertical joints after uneven wear and further cause glue leakage is avoided; meanwhile, the hinge seat 710 and the hinge shaft are easily damaged parts with simple structures and low cost, and maintenance can be performed by replacing the hinge seat 710 and the hinge shaft, so that the later maintenance cost is reduced.

6. Because the core contained angle is different, the core motion sequence need strictly go on according to the design intention when opening and shutting the motion, and the utility model discloses first drive division 410 and second drive division 420 structure slightly differ, has solved first core 210 and second core 220 motion sequence problem, and the structure that second drive division 420 tip exceeds first drive division 410 can make first drive division 410 not contact first core 210 yet, and second drive division 420 has promoted second core 220 outward movement in advance, has guaranteed that the core can not take place the motion collision and interfere; when the core movement no longer interferes, the driving portion drives the core movement at the same time, and the sliding groove 222 of the second core 220 is designed to just allow the precursor structure of the second driving portion 420 to slide into the groove, and no longer plays a major role.

7. The inside whole chamber that becomes of general core design, the core just can not process the gas pocket so and be favorable to tire exhaust gas when vulcanizing, and the utility model discloses a core with cross drilling stroke heating medium's return circuit or directly at downthehole heating, the exhaust hole can be processed to the distance between the heating hole, is that the gas between tire and the core can discharge, and the tire quality of vulcanizing is higher.

8. The core is used as an independent part, the shape of the core can be designed into a contour which is consistent with the shape of the inner cavity of the tire, and the core can also be designed into a straight surface or a curved surface, and the core is respectively suitable for tires with different purposes, such as inflatable tires, inflation-free tires, retreaded tires and the like.

9. The attachment holes 601 and mating holes 602 allow for adjustment of spring tension and travel, allowing for better mating of the components.

10. By adopting the mode to open the die, the die structure is more stable; meanwhile, the rigid mold core is driven without a complex mechanical structure, and a complex driving mechanism of the vulcanizing machine is not required to act, so that the space is saved, and the equipment cost is reduced.

Example 2

Referring to fig. 9, it can be seen that the present embodiment of the invention provides a rigid core 10, which is substantially the same as the first embodiment, except that in the present embodiment, the front protrusion 422 is not provided on the second core 220, and the sliding groove 222 is not provided on the first driving portion 410.

In the present embodiment, the mating face 431 of the second core 220 has a larger inclination angle than the mating face 431 of the first core 210, so that the second core 220 reaches the closed state before the first core 210. Such an arrangement is simple in structure and convenient to process, and can ensure that the second core 220 reaches the closed state before the first core 210 when the second core is in the closed state.

Example 3

Referring to fig. 10 and 11, it can be seen that the present embodiment of the invention provides a rigid core 10, which is substantially the same as the first embodiment, except that in the present embodiment, the second core 220 is not provided with the front protrusion 422, and the second driving portion 420 is not provided with the sliding groove 222.

In the present embodiment, the lower outside driving surface 430 of the second driving portion 420 pushes the mating surface 431 of the inside of the second core 220 to move radially outward at the time of mold clamping. The inclination angle of the mating surface 431 of the second core 220 is greater than that of the mating surface 431 of the first core 210, and the inclination angle of the upper portion of the mating surface 431 inside the second core 220 is greater than that of the lower portion of the mating surface 431, so that the second core 220 reaches a closed state before the first core 210.

Specifically, the mating surface 431 is a surface that mates with the driving surface 430. As seen in the drawings, the mating surface 431 of the second core 220 in this embodiment is not a single bevel, but includes a first inclined section 441 and a second inclined section 442 connected to each other, as compared to the first embodiment. Wherein the first inclined section 441 is located at an upper portion of the second core 220, and the second inclined section 442 is located at a lower portion of the first inclined section 441. The inclination angle of the first inclined section 441 is greater than that of the second inclined section 442. This ensures that the second core 220 reaches the closed state before the first core 210 when in the closed state.

Example 4

Referring to fig. 12, it can be seen that the present embodiment of the invention provides a rigid core, which is substantially the same as the first embodiment, except that in the present embodiment, the first mechanism 110 and the second mechanism 120 are integrally connected.

Specifically, the first core 210 has a first through hole, and the first hinge mechanism is movably disposed in the first through hole through a pin shaft, and moves in a radial direction along an extending direction of the first through hole; the second core 220 has a second through hole, and the second hinge mechanism is movably disposed in the second through hole by a pin shaft, and moves in a radial direction along an extending direction of the second through hole.

The height of the second through hole relative to the base is higher than that of the first through hole relative to the base, or the first mold core 210 and the second mold core 220 are staggered in the radial direction when the mold is in an open state through the configuration difference between different through holes and different pin shafts.

Further, as shown in fig. 12, the first core 210 and the second core 220 are at the same level; the connection point of the first hinge mechanism to the first core 210 and the connection point of the second hinge mechanism to the second core 220 are at the same level; the height of the connection point of the second chain mechanism to the center mechanism 100 is greater than the height of the connection point of the first chain mechanism to the center mechanism 100. And the heights of the first core 210 and the second core 220 are the same.

Example 5

The present embodiment of the present invention provides a tire mold 20, which comprises an upper cover 21, a base 22 and the above-mentioned rigid core 10; the first driving part 410 and the second driving part 420 are both provided on the upper cover 21; the first core 210 and the second core 220 are each disposed movably on the base 22 in a radial direction of the base 22.

Optionally, a mold includes an upper side plate 23, a lower side plate 24, a pattern portion, a guide, an upper cover 21, a base 22, and the like, and the cavity portions of the upper side plate 23 and the lower side plate 24 are in accordance with the tire sidewall requirement; the upper side plate 23 is connected with the first driving part 410 and the second driving part 420 respectively; the lower side plate 24 is connected with the hinge base 710; the rigid mold core is mechanical, and a clamp for clamping the rubber capsule is not needed.

In other embodiments, there may be a mold without side plates. The upper cover 21 is connected with the first driving part 410 and the second driving part 420; the base 22 is connected with the hinge base 710. In addition, the rigid core structure is independent and can be designed and matched according to the vulcanizing machine, and the rigid core is related to the internal structure of the tire, and does not need to be changed for the pattern part of the tire.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (18)

1. A rigid core, comprising:

the core mechanism comprises a center mechanism, a plurality of first cores, a plurality of second cores, a plurality of fixedly arranged first driving parts and a plurality of fixedly arranged second driving parts;

the first mold cores and the second mold cores are the same in quantity, and are uniformly distributed in the circumferential direction and sequentially arranged at intervals; the bottom of the first core and the bottom of the second core are both configured to be movably arranged on a base of a tire mold along a radial direction of the base;

the first driving parts are the same as and correspond to the first cores in number one by one, and the second driving parts are the same as and correspond to the second cores in number one by one; the radial outer side of the first driving part and the radial outer side of the second driving part are both provided with driving surfaces, the radial inner side of the first core and the radial inner side of the second core are both provided with matching surfaces, the driving surfaces are matched with the matching surfaces, and the driving surfaces and/or the matching surfaces are obliquely arranged, so that the first core and the second core can move outwards in the radial direction through the action of the driving surfaces and the matching surfaces in the mold closing process;

the rigid core has an open state and a closed state;

when in the open state, the first core and the second core are mutually staggered in a radial direction;

the first and second cores are arranged in a ring-shaped configuration when in the closed state;

the second core has a drive surface with a drive structure that enables the second core to reach a closed position in a closed state before the first core.

2. The rigid core of claim 1, wherein:

the central mechanism comprises a first mechanism, a second mechanism and an intermediate elastic piece;

the second mechanism is arranged above the first mechanism, and the first mechanism and the second mechanism are axially connected;

the radial inner side of the first mold core is movably connected with the central mechanism through a first connecting mechanism, and the radial inner side of the second mold core is movably connected with the central mechanism through a second connecting mechanism;

the first connecting mechanism is movably connected with the first mechanism, and the second connecting mechanism is movably connected with the second mechanism.

3. The rigid core of claim 2, wherein:

the first mechanism and the second mechanism are axially connected through the intermediate elastic member.

4. The rigid core of claim 2, wherein:

the middle elastic piece is a compression spring.

5. A rigid core according to any one of claims 2-4, characterized in that:

two ends of the first connecting mechanism are movably connected with the first mold core and the central mechanism respectively; the second connecting mechanism comprises a second stretching elastic piece, and two ends of the second connecting mechanism are movably connected with the second mold core and the central mechanism respectively;

the connecting position of the second connecting mechanism and the central mechanism is higher than that of the first connecting mechanism and the central mechanism;

and/or the first attachment mechanism comprises a first tensile elastic member.

6. The rigid core of claim 5, wherein:

the first tensile elastic member and the second tensile elastic member are both tension springs.

7. The rigid core of claim 5, wherein:

the first connecting mechanism further comprises a first connecting part arranged on the inner side of the first mold core, the first connecting part comprises first connecting holes arranged along the axial direction, one end of the first stretching elastic piece is movably connected with any one of the first connecting holes, and the other end of the first stretching elastic piece is movably connected with the central mechanism;

the second connecting mechanism further comprises a second connecting portion arranged on the inner side of the second mold core, the second connecting portion comprises second connecting holes arranged along the axial direction, one end of the second stretching elastic piece is movably connected with any one of the second connecting holes, and the other end of the second stretching elastic piece is movably connected with the central mechanism.

8. The rigid core of claim 7, wherein:

the first connecting mechanism further comprises a first matching portion arranged on the central mechanism, the first matching portion comprises first matching holes arranged along the axial direction, and the other end of the first stretching elastic piece is movably connected with any one of the first matching holes.

9. The rigid core of claim 8, wherein:

the second coupling mechanism is still including setting up second cooperation portion on the central mechanism, second cooperation portion includes the second mating holes of arranging along the axial, the other end of the tensile elastic component of second with arbitrary second mating holes movably connects.

10. The rigid core of claim 9, wherein:

the first mating hole has a height greater than a height of the second mating hole.

11. A rigid core according to any one of claims 2-4, characterized in that:

the first connecting mechanism comprises a first hinge mechanism, and two ends of the first hinge mechanism are movably connected with the first mold core and the central mechanism respectively; and/or the second connecting mechanism comprises a second hinge mechanism, and two ends of the second hinge mechanism are movably connected with the second core and the central mechanism respectively.

12. A rigid core according to any one of claims 1 to 4, wherein:

the driving surface is inclined radially outwardly, and an inclination angle of the driving surface of the second driving portion is larger than an inclination angle of the driving surface of the first driving portion, so that the second core reaches a closed state before the first core.

13. A rigid core according to any one of claims 1 to 4, wherein:

the second driving part comprises a body and a front driving bulge, the front driving bulge is arranged at the bottom of the body, and the front driving bulge extends outwards in the radial direction; the surface of the forward-drive projection and the surface of the body together form the drive surface such that the second core reaches a closed state before the first core.

14. The rigid core of claim 13, wherein:

a sliding groove is formed in one side, close to the driving surface of the second driving part, of the second core; when the front drive lug is in a closed state, the front drive lug is in embedded fit with the sliding groove.

15. The rigid core of claim 14, wherein:

the sliding groove is vertically arranged downwards.

16. A rigid core according to any one of claims 1 to 4, wherein:

when the mold is closed, the lower outer side of the second driving part pushes the inner side surface of the second mold core to move outwards in the radial direction.

17. The rigid core of claim 16, wherein:

the inclination angle of the matching surface of the second core is larger than that of the matching surface of the first core, and the inclination angle of the upper part of the matching surface at the inner side of the second core is larger than that of the lower part of the matching surface, so that the second core is in a closed state before the first core.

18. A tire mold, characterized by:

the tire mold comprising an upper cover, a base, and the rigid core of any one of claims 1-17; the first core and the second core are both arranged on the base movably along the radial direction of the base.

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