CN109501343B - Internal mold assembly, use method of internal mold assembly and tire mold - Google Patents

Abstract

The invention particularly relates to an inner mold assembly, a using method of the inner mold assembly of a tire mold and the tire mold. An inner mold assembly includes a bladder and a core assembly including a plurality of first cores and a plurality of second cores. The first and second cores are circumferentially staggered such that the core assembly is movable radially between an open condition and a closed condition; in the open state, the core assembly is disengaged from the tire or green tire; in the closed state, the core assembly supports the tire or green tire, and the outer edge profile of the core assembly corresponds to the inner edge profile of the tire or green tire; in the closed state or transition from the open state to the closed state, the core assembly is urged to move radially outwardly by the expansion of the capsule, thereby driving the core assembly from the open state to the closed state.

Description

Internal mold assembly, use method of internal mold assembly and tire mold

Technical Field

The invention relates to the field of tire molds, in particular to an inner mold assembly, a using method of the inner mold assembly of the tire mold and the tire mold.

Background

When the tire is vulcanized, the tire is often supported or stretched by an inner mold. For example, a tire bladder is a frequently used tire curing internal mold, which is mainly used for filling compressed air, nitrogen or superheated water in the tire curing process. Stretching the rubber blank to support the rubber blank to form the internal pressure vulcanized tire.

Disclosure of Invention

Objects of the present invention include providing an inner mold assembly that can be positioned outside of an inflation bladder and inside of a tire product; the core assembly is in a multi-piece split mode, so that the diameter-changing purpose can be realized, a tire blank can be conveniently assembled and a finished product can be conveniently taken out, the applicability of the core assembly to vulcanization of tires of different types and specifications can be obviously improved, and the large-scale production line production is facilitated.

Another object of the present invention is to provide a method of using the above-described tire mold inner mold assembly, such that the inner mold assembly can be used conveniently.

Another object of the present invention is to provide a tire mold comprising the above inner mold assembly, which has high precision, stable structure, and superior economic efficiency.

The embodiment of the invention is realized by the following technical scheme:

an inner mold assembly for mating with an outer mold assembly of a tire mold, comprising:

a capsule;

and a core assembly comprising a plurality of first cores and a plurality of second cores;

the first and second cores are circumferentially staggered such that the core assembly is movable radially between an open condition and a closed condition; in the open state, the core assembly is disengaged from the tire or green tire; in the closed state, the core assembly supports the tire or green tire, and the outer edge profile of the core assembly corresponds to the inner edge profile of the tire or green tire;

in the closed state or transition from the open state to the closed state, the core assembly is urged to move radially outwardly by the expansion of the capsule, thereby driving the core assembly from the open state to the closed state.

The invention continues to use the quick and convenient inflation capsule, and designs a set of core components to be arranged at the outer side of the inflation capsule and the inner side of the tire product; the core assembly is in a multi-piece split mode, so that the purpose of reducing can be realized, and the tire blank can be conveniently assembled and the finished product can be conveniently taken out. The inflation bladder is used as a power source and a heating source for driving the core assembly, so that the core assembly can be closed, and the tire blank can be stretched in a standard annular shape in the closed state. The inflation capsule acts rapidly, the travel is large, the roundness of the core assembly is good, the travel is small, and the defects of low production efficiency, low roundness and the like of the tire are overcome by combining the inflation capsule with the core assembly. The two strokes are driven by different modes and do not interfere with each other, the structure is simple, and the existing vulcanizing machine does not need to be changed.

In one embodiment of the invention:

the upper part of the first core and/or the second core is provided with a first driving mechanism;

a first drive mechanism is coupled to the central rod to drive the first mandrel and/or the second mandrel radially outwardly.

In one embodiment of the invention:

the first driving mechanism is a driving ring;

the radial outer peripheral surface of the driving ring is provided with a driving surface which is arranged on at least part of the area of the driving ring;

the inner side surface of the upper part of the first core and/or the second core is provided with a matching surface, and the matching surface and the driving surface are matched with each other in the transition process from the open state to the closed state so as to push the upper parts of the first core and the second core to move outwards in the radial direction;

preferably, the driving surface is a conical surface or an inclined surface.

In one embodiment of the invention:

a second driving mechanism is arranged at the lower part of the first core and/or the second core;

the second driving mechanism drives the lower part of the first core and/or the second core to move inwards in the radial direction through the second driving mechanism; the second driving mechanism is arranged on the base of the die.

In one embodiment of the invention:

the second driving mechanism comprises a lower clamping ring seat,

the first elastic piece is arranged at one end of the first core close to the base, and the first elastic piece provides elastic force for enabling the first core to be close to the center rod;

and/or a second elastic member, the second elastic member being disposed at an end of the second core near the base, the second elastic member providing an elastic force in a direction of approaching the second core to the center rod;

preferably, there are at least 2 elastic members per core;

optionally, the lower clamping ring seat is circumferentially arranged with a spring cavity extending in a radial direction, and the elastic member is arranged in the spring cavity.

In one embodiment of the invention:

the first elastic member includes a first spring and a first connecting rod,

one end of the first connecting rod is fixed on the first core, and the other end of the first connecting rod is movably arranged in a spring cavity on the first core;

the second elastic piece comprises a second spring and a second connecting rod,

one end of the second connecting rod is fixed on the second core, and the other end of the second connecting rod is movably arranged in a spring cavity on the second core;

preferably, the device further comprises a limiting protrusion;

the limiting bulge is arranged on the first connecting rod and is positioned at one end of the first connecting rod, which is arranged in the spring cavity;

the limiting bulge is arranged on the second connecting rod and is positioned at one end of the second connecting rod, which is arranged in the spring cavity; one end of the elastic piece is propped against the outer side wall of the spring cavity, and the other end of the elastic piece is propped against the limiting protrusion.

In one embodiment of the invention:

the lower part of the first core and/or the second core is provided with a guide mechanism;

the guide mechanism enables the first core and the second core to move along the radial direction of the internal mold assembly;

preferably, the guide mechanism comprises a pin, a guide hole arranged in the lower clamping ring seat, and a matching hole arranged corresponding to the guide pin holes of the first core and the second core;

the two ends of the pin are respectively and movably arranged in the guide hole and the matching hole or one of the guide hole and the matching hole;

or,

the guide mechanism is a guide rail mechanism.

In one embodiment of the invention:

the inner mold assembly comprises a capsule clamping mechanism;

the capsule clamping mechanism comprises an upper clamping ring, an upper clamping ring cone seat, a lower clamping ring and a lower clamping ring seat;

the upper clamping ring is assembled with the upper clamping ring conical seat to clamp the upper end of the inflatable capsule, and is arranged on the central rod of the vulcanizing machine; the lower clamping ring is assembled with the lower clamping ring seat to clamp the lower end of the inflatable capsule;

preferably, the drive ring is configured as an upper clamping ring.

A method of using an inner mold assembly based on the inner mold assembly of any one of the above;

in the open state, the core assembly is separated from the tire or the green tire so as to smoothly load the green tire into the tire and take out the finished tire; the center rod moves downward to drive the core assembly radially outward;

the core assembly is urged to move radially outwardly by the expansion of the capsule, thereby driving the core assembly from the open condition to the closed condition;

after the tire is vulcanized, the central rod moves upwards, and simultaneously the inflation capsule is deflated and contracted, and the core assembly is contracted inwards in the radial direction; the core assembly is separated from the tire and generates a certain hole due to the movement stroke, so that the tire can be conveniently and smoothly taken down.

A tire mold further comprising an inner mold assembly of any of the above;

preferably, the upper cover and the base are provided with annular bulges, and in a closed state, the end surfaces of the annular bulges, the pattern blocks and the outer peripheral surface of the core assembly jointly define an inner cavity of the vulcanized tire or the tire blank;

or a supporting structure is arranged between the core assembly and the pattern block, the supporting structure comprises a telescopic spring hole and a supporting seat, and the supporting seat and the spring are arranged in the spring hole; in the mold opening state, the supporting seat extends out of the spring hole under the action of the spring and supports the tread; in the mold closed state, the supporting seat is pressed to retract into the spring hole.

The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:

the inflation bladder is used as a power source and a heating source for driving the core assembly, so that the core assembly can be closed, and the tire blank can be stretched in a standard annular shape in the closed state. The inflation capsule acts rapidly, the travel is large, the roundness of the core assembly is good, the travel is small, and the defects of low production efficiency, low roundness and the like of the tire are overcome by combining the inflation capsule with the core assembly. The driving mode is simple in structure, and the existing vulcanizing machine does not need to be changed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of a tire mold according to an embodiment of the present invention;

FIG. 2 is a top view block diagram of a core component according to an embodiment of the present invention;

FIG. 3 is a schematic view of an embodiment of the mold in an open state;

FIG. 4 is a top view of an embodiment of the mold in an open state;

FIG. 5 is a schematic view of an elastic member according to an embodiment of the present invention;

FIG. 6 is a schematic view of a lower clamping ring base according to an embodiment of the present invention;

FIG. 7 is a schematic view of the structure of the upper and lower side plates according to the embodiment of the present invention;

fig. 8 is a schematic structural diagram of a second driving mechanism according to an embodiment of the present invention.

Icon: 10-an inner mold assembly; 100-a first core; 200-a second core; 310-a first elastic member; 320-a second elastic member; 330-limit bump; 411-upper clamping ring; 412-upper clamping ring cone seat; 521-lower clamping ring; 522-lower clamping ring seat; 600-guiding mechanism; 610-guide pin holes; 700-spring chamber; 20-a die; 21-an upper cover; 22-upper side plate; 23-a base; 24-lower side plate; 25-center rod; 26-pattern blocks; 27-a tire; 28-capsule.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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 apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention 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 invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following 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", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhang" and the like, if any, do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

To overcome the above problems, an inner mold assembly 10 is provided in the following embodiments.

Referring to fig. 1, fig. 1 is a cross-sectional view of a tire mold 20 (including an inner mold assembly 10) according to an embodiment of the present invention. From fig. 1, an inner mold assembly 10 is seen which includes a bladder 28 and a core assembly of a plurality of first cores 100 and a plurality of second cores 200.

The first and second cores 100, 200 are circumferentially staggered such that the core assembly is movable radially between an open state and a closed state; in the open state, the core assembly is disengaged from the tire 27 or green tire; in the closed state, the core assembly supports the tire 27 or green tire, and the outer edge profile of the core assembly corresponds to the inner edge profile of the tire 27 or green tire;

in the closed state or transition from the open state to the closed state, the core assembly is urged to move radially outwardly by the expansion of the bladder 28, thereby driving the core assembly from the open state to the closed state.

The embodiment of the invention continues to use the quick and convenient inflation bladder 28, and designs a set of core assemblies to be arranged at the outer side of the inflation bladder 28 and the inner side of the tyre 27 product; the core assembly is in a multi-piece split mode, so that the purpose of reducing can be realized, and the tire blank can be conveniently assembled and the finished product can be conveniently taken out. The inflation bladder 28 serves as a power source and a heat source for driving the core assembly to close the core assembly and to open the green tire in a standard annular configuration in the closed position. The inflation bladder 28 acts rapidly, the travel is large, the roundness of the core assembly is good, the travel is small, the combination of the two solves the defects of low production efficiency, low roundness and the like of the tire 27, and the structure is simple, so that the existing vulcanizing machine does not need to be changed.

With continued reference to fig. 1-8 for further details.

Further, in the open condition (as shown in fig. 3), the bladder 28 is not inflated, the core assembly is moved toward the center rod 25 and remains offset from each other, while the outer diameter of the core is smaller than the inner diameter of the tire 27 or green tire, so that the tire 27 or green tire can be freely installed or removed.

In the closed condition (as in fig. 1), bladder 28 is inflated, driving the core radially outwardly to the closed condition, thereby conforming the core to the inner wall of tire 27 or green tire; the continued inflation of bladder 28 causes the core to open the green tire in a closed state in a standard annular configuration. The bladder 28 provides a stable source of heat for curing during curing; at the same time, the stability of inflation also allows bladder 28 to continue to extend tire 27 outwardly during curing.

Further, in curing the tread structure, the lower side plate 24 is provided with annular projections, the upper end of which supports the sidewalls of the tire 27.

In other embodiments, the lower side plate 24 may be provided with a telescoping support on the outer side wall of the core to support the sidewalls of the tire 27 during curing of the tread structure. The telescopic supporting seat comprises a supporting seat, a spring is fixedly connected to the radial inner side of the supporting seat, and the spring and a part of the supporting seat are arranged in the supporting hole in a telescopic mode. Or in the case of a vulcanized green tire structure, the upper surface of the lower side plate 24 is provided with a sidewall pattern of the vulcanized tire 27.

As can be seen from the figures, the cross sections of the first core 100 and the second core 200 are fanned, and the fanned area of the first core 100 is smaller than the fanned area of the second core 200. The opening angle of the first core 100 is directed to the outside of the circle of the first core 100, and the opening angle of the second core 200 is directed to the center of the circle of the second core 200. One side of the first core 100 and the side of the adjacent one of the second cores 200 are in contact with each other.

The included angles of the two side surfaces of the core (including the first core 100 and the second core 200, which will be the same below) have a certain angle, and the two side surfaces are set as required, so long as interference or self-locking does not occur during the movement process.

Further, in the present embodiment, a first driving mechanism is provided at an upper portion of the first core 100 and/or the second core 200; a first drive mechanism is coupled to the central rod 25 to drive the first core 100 and/or the second core 200 radially outwardly.

Optionally, the first core 100 and/or the second core 200 are moved axially by the central rod 25 to effect expansion or contraction of the cores in the radial direction.

The first driving mechanism is matched with the pushing action of the capsule, so that the radial outward movement action of the core assembly in the transition process from the opening state to the closing state can be better realized, the efficiency is better, and the roundness of the core assembly is better ensured.

Further, the first driving mechanism is a driving ring; the radial outer peripheral surface of the driving ring is provided with a driving surface which is arranged on at least part of the area of the driving ring; the inner side surfaces of the upper parts of the first core 100 and/or the second core 200 are provided with matching surfaces, and the matching surfaces and the driving surfaces are matched with each other in the transition process from the open state to the closed state so as to push the upper parts of the first core 100 and the second core 200 to move outwards in the radial direction. In this embodiment, the drive ring is moved up and down by the central rod 25 to effect the driven radial movement.

Preferably, the driving surface is a conical surface or an inclined surface. The driving surface may be a tapered surface on the entire outer circumferential surface of the driving ring, or may be a tapered surface or an inclined surface at a position corresponding to each of the first core 100 and the second core 200. (only a part of the region may protrude, and the outer end surface of the protruding structure may be the tapered surface or the inclined surface.)

Correspondingly, the radial inner side surface of the core is an inner conical surface matched with the driving surface. In the closed state, the driving surface part is firstly contacted with the inner conical surface of the mold core, and the conical surfaces of the driving surface are firstly contacted with the conical surfaces of the first mold core 100 due to different strokes of the first mold core 100 and the second mold core 200, so that the first mold core 100 is driven to move outwards, and the first mold core 100 simultaneously drives the second mold core 200 to move outwards. The driving mode of the driving surface has the characteristics of simplicity, rapidness and controllable cost.

In the present embodiment of the present invention, the lower portion of the first core 100 and/or the second core 200 is provided with a second driving mechanism; the second driving mechanism drives the lower part of the first core 100 and/or the second core 200 to move radially inwards through the second driving mechanism; the second drive mechanism is provided on the base 23 of the mould 20. The radially inward movement of the core assembly during the transition from the closed state to the open state can be accomplished by the second drive mechanism.

Further, the second driving mechanism includes a lower clamping ring seat 522, and a first elastic member 310, where the first elastic member 310 is disposed at an end of the first core 100 near the base 23, and the first elastic member 310 provides an elastic force for making the first core 100 approach the center rod 25; and/or a second elastic member 320, the second elastic member 320 being disposed at an end of the second core 200 near the base 23, the second elastic member 320 providing an elastic force in a direction of approaching the second core 200 to the center rod 25. The elastic driving structure is simpler.

The core is continuously forced adjacent to the lower clamp ring mount 522 by the elastic members (first elastic member 310 and second elastic member 320, hereinafter the same) provided thereto.

Preferably, there are at least 2 elastic members per core. The elastic pieces are circumferentially and uniformly distributed, so that the elastic force provided by the elastic pieces can uniformly act on the mold core.

Alternatively, the lower clamp ring mount 522 is circumferentially arranged with a spring cavity 700 extending in a radial direction, and the resilient member is disposed in the spring cavity 700.

Further, in the present embodiment of the invention, the first elastic member 310 includes a first spring and a first connecting rod, one end of the first connecting rod is fixed on the first core 100, and the other end of the first connecting rod is movably disposed in the spring cavity 700 on the first core 100; the second elastic member 320 includes a second spring and a second connection rod, one end of which is fixed to the second core 200, and the other end of which is movably disposed in a spring cavity 700 formed in the second core 200.

Optionally, the first connecting rod and the second connecting rod are screws.

The scheme has simple structure and convenient manufacture, and can provide stable elastic acting force.

The spring cavity 700 communicates with the outside through screw holes or slots, and springs (including first and second springs, hereinafter the same) are disposed within the spring cavity 700 to provide a continuous force to the core adjacent the lower clamp ring mount 522 through the action of the springs. One side of the spring screw is provided with a spring limiting end, and the other side of the spring screw penetrates through the screw hole or the groove to be fixed on the mold core. The spring is threaded onto the spring screw with one side of the spring abutting against the inner wall of the spring cavity 700 and the other side abutting against the spring stop.

Preferably, the device further comprises a limit protrusion 330; the limiting protrusion 330 is disposed on the first connecting rod and is located at one end of the first connecting rod disposed in the spring cavity 700; and the limit protrusion 330 is arranged on the second connecting rod and is positioned at one end of the second connecting rod which is arranged in the spring cavity 700; one end of the elastic member abuts against the outer side wall of the spring cavity 700, and the other end of the elastic member abuts against the limit projection 330. Specifically, one end of the spring member abuts a radially outward sidewall of the spring cavity 700. The limiting projection 330 is used for locking the screw to prevent loosening in use, and simultaneously, the extension length of the spring screw can be adjusted to adjust the pressure of the spring.

Optionally, the limiting protrusion 330 is a nut.

In the present embodiment of the present invention, the first core 100 and/or the second core 200 are provided with a guide mechanism 600 at a lower portion thereof; the guide mechanism 600 moves the first core 100, the second core 200 in the radial direction of the inner mold assembly 10. The guide mechanism 600 can ensure that the movement is more stable during the conversion of the cores between the open and closed states.

Preferably, the guide mechanism 600 includes pins, guide holes provided in the lower clamp ring holder 522, and mating holes provided in correspondence with the guide pin holes 610 of the first core 100 and the second core 200; the two ends of the pin are respectively movably arranged in the guide hole and the matching hole or one of the guide hole and the matching hole. While one end of the pin is movably disposed in one of the guide hole or the mating hole, the other end of the pin is fixed to the core or the base 23 or the lower clamp ring seat 522. Specifically, the connecting rod is fixedly connected through threads.

The guide pins are fixed to the lower clamp ring seat 522 of the lower driving device by set screws, and the guide pins are inserted into the guide holes of the first core 100 and the second core 200, so that the first core 100 and the second core 200 can only move along the axial direction of the guide pins. The two side surfaces of the first core 100 and the second core 200 are always contacted during the movement, and the travel of the first core 100 limits the travel of the second core 200.

In this embodiment of the present invention, the inner mold assembly 10 includes a capsule 28 clamping mechanism; the capsule 28 clamping mechanism comprises an upper clamping ring 411, an upper clamping ring conical seat 412, a lower clamping ring 521 and a lower clamping ring seat 522; the upper clamping ring 411 and the upper clamping ring cone seat 412 are assembled together to clamp the upper end of the inflation capsule 28, and the upper clamping ring 411 is installed on the central rod 25 of the vulcanizing machine; preferably, the drive ring is configured as an upper clamping ring 411.

The upper clamping ring 411 is assembled with the upper clamping ring conical seat 412 to clamp the upper end of the inflation bladder 28, while the upper clamping ring 411 is mounted on the center rod 25 of the vulcanizing machine. The outer conical structure of the upper clamping ring conical seat 412 can drive the first core 100 and the second core 200 to move, and simultaneously limit and restore the first core 100 and the second core 200 into a circular ring shape.

The lower clamping ring 521 is assembled with the lower clamping ring seat 522 to clamp the lower end of the inflatable capsule 28; while the spring cavity 700 of the lower clamp ring mount 522 is used to receive and secure the springs assembled with the first and second cores 100, 200. The size of the spring cavity 700 is related to the travel of the spring screw, and typically the length of the spring cavity 700 is greater than the travel of the spring screw. The spring cavity 700 and the guide pin hole 610 of the lower clamp ring mount 522 correspond to the guide pin hole 610 and the spring screw position of the first core 100 and the second core 200, and different corresponding planes are respectively processed according to the structural differences of the first core 100 and the second core 200.

In use, when the first and second cores 100, 200 are in the contracted state, the outer circles of the first and second cores 100, 200 are smaller than the green tire 27 so as to smoothly load and unload the finished tire 27. After the green tire is loaded, the center rod 25 moves downwards, the conical surface part of the upper clamping ring conical seat 412 is firstly contacted with the inner conical surfaces of the first core 100 and the second core 200, and because the strokes of the first core 100 and the second core 200 are different, the conical surface of the upper clamping ring conical seat 412 is firstly contacted with the conical surface of the first core 100 to drive the first core 100 to move outwards, the first core 100 simultaneously drives the second core 200 to move outwards,

when the first core 100 and the second core 200 are moved outwards until the outer circles of the first core 100 and the second core 200 are in contact with the inner hole walls of the lower side plate 24, the first core 100 and the second core 200 are restored to be circular, and the movement of the first core 100 and the second core 200 enables the green tire to be circular until the conical surface of the upper clamping ring conical seat 412 moves to be in full contact with the conical surfaces of the first core 100 and the second core 200 until the central rod 25 moves to be in full contact with the conical surfaces of the first core 100 and the second core 200, the vulcanizing machine moves downwards, the pattern blocks 26 are folded to compress the green tire, and the upper side plate 22 compresses the lateral surface of the green tire to fix the first core 100 and the second core 200. The inflation bladder 28 is inflated with hot fluid to heat the first core 100 and the second core 200 into the vulcanization production stage of the tire 27, and at the same time, the internal pressure of the inflation bladder 28 is balanced with the internal pressure given to the tire 27 from the outside by the block 26, and the precise annular state of the first core 100 and the second core 200 is maintained until the vulcanization is completed.

After the tire 27 is vulcanized, the center rod 25 moves upward, and the inflation bladder 28 is deflated and contracted, and the inner walls of the first core 100 and the second core 200 lose support force, and at this time, the upper springs mounted on the first core 100 and the second core 200 serve as driving force sources to force the first core 100 and the second core 200 to contract inward. The first core 100 and the second core 200 are separated from the tire 27 and are contracted inwards, so that the tire 27 can be removed smoothly.

The inflation bladder 28 is important in this configuration as a power source for driving the first and second cores 100, 200 closed and a source for providing heat. However, other types of mechanisms can be used to drive the first and second cores 100, 200 open, the bladder 28 can be eliminated, and hot steam can be directly introduced as a heat source for directly vulcanizing the tire 27, where the wall thickness of the first and second cores 100, 200 or the selected material is required to have sufficient strength so that the blocks 26 do not deform and lose precision when the green tire is compressed.

The springs in this structure serve to drive the first core 100, the second core 200 to open, and the structure thereof is not limited to compression springs, belleville springs, gas springs, hydraulic cylinders, and the like.

Example 2

The present embodiment provides an inner mold assembly (not shown) that is substantially identical to the inner mold assembly 10 of the first embodiment, except that the guide mechanism 600 of the present embodiment is a guide rail mechanism.

Specifically, a guide rail mechanism is provided between the first core 100, the second core 200, and the lower side plate 24, for example, a T-shaped guide bar is provided on the first core 100 or the second core 200, a T-shaped guide groove is provided on the lower side plate 24, and the T-shaped guide bar moves radially in the T-shaped guide groove.

Example 3

The present embodiment of the present invention provides a method for using the inner mold assembly 10, which is based on the inner mold assembly of the first embodiment or the second embodiment. The using method comprises the following steps:

in the open condition, the core assembly is disengaged from the tire 27 or green tire for smooth loading and unloading of the finished tire 27; the center rod 25 moves downwardly to drive the core assembly radially outwardly;

the core assembly is urged radially outwardly by the expansion of the bladder 28 to thereby drive the core assembly from the open condition to the closed condition;

after the tire 27 is cured, the center rod 25 is moved upward while the inflation bladder 28 is deflated and the core assembly is retracted radially inwardly; the core assembly is disengaged from the tire 27 and creates a void due to the travel path, facilitating smooth removal of the tire 27.

Example 4

The present embodiment of the present invention provides a tire mold 20 based on the inner mold assembly of the first or second embodiment described above.

A tire mold 20 further comprising an inner mold assembly of any of the above;

preferably, the upper cover 21 and the base 23 are provided with annular bulges, and in a closed state, the end surfaces of the annular bulges, the pattern blocks 26 and the outer peripheral surface of the core assembly jointly define an inner cavity of the vulcanized tire 27 or the tire blank;

or, a supporting structure is arranged between the core assembly and the pattern block 26, the supporting structure comprises a telescopic spring hole and a supporting seat, and the supporting seat and the spring are arranged in the spring hole; in the open state of the mold 20, the supporting seat extends out of the spring hole under the action of the spring and supports the tread; the mold 20 is closed and the support is compressed to retract into the spring bore.

The technical scheme of one embodiment of the invention has at least the following advantages and beneficial effects:

the core assembly is spring-driven and the inflation bladder 28 serves as a power source and a heating source for driving the core assembly to close the core assembly and to open the green tire in a standard annular configuration in the closed position. The inflation bladder 28 acts rapidly with a large stroke while the core assembly has good roundness and the first drive mechanism has a small stroke, and the combination of the two solves the problem of low production efficiency of the tire 27. The two strokes are driven by different modes and do not interfere with each other, the structure is simple, and the existing vulcanizing machine does not need to be changed. In particular, the method comprises the steps of,

1. the mechanical core formed by the first core 100 and the second core 200 has the characteristics of good roundness, uniform heat transfer, uniform wall thickness of the vulcanized tire 27 and good dynamic balance.

2. The invention does not greatly change the existing vulcanizing machine and tyre mould 20, is well suitable for various steamer-type vulcanizing machines and hot plate-type vulcanizing machines and moulds 20, can reduce the transformation cost and period of the tyre mould 20 and the vulcanizing machine, and is quickly applied to production.

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

Claims (13)

1. An inner mold assembly for mating with an outer mold assembly of a tire mold, comprising:

a capsule;

and a core assembly comprising a plurality of first cores and a plurality of second cores;

the first and second cores are circumferentially staggered such that the core assembly is movable radially between an open state and a closed state; in the open state, the core assembly is disengaged from the tire or green tire; in the closed state, the core assembly supports the tire or green tire, and an outer edge profile of the core assembly corresponds to an inner edge profile of the tire or green tire;

in the closed state or in the open state transition to the closed state, the core assembly is urged to move radially outwardly by the expansion of the capsule, thereby driving the core assembly from the open state to the closed state;

the lower part of the first core and/or the second core is provided with a second driving mechanism, and the second driving mechanism comprises a lower clamping ring seat, a first elastic piece and/or a second elastic piece;

at least 2 elastic pieces are arranged on each core;

a spring cavity extending towards the radial direction is circumferentially arranged on the lower clamping ring seat, and the elastic piece is arranged in the spring cavity;

the first elastic member includes a first spring and a first connecting rod,

one end of the first connecting rod is fixed on the first core, and the other end of the first connecting rod is movably arranged in a spring cavity on the first core;

the second elastic piece comprises a second spring and a second connecting rod,

one end of the second connecting rod is fixed on the second core, and the other end of the second connecting rod is movably arranged in a spring cavity on the second core;

the device also comprises a limit bulge;

the limiting protrusion is arranged on the first connecting rod and is positioned at one end of the first connecting rod, which is arranged in the spring cavity;

the limiting protrusion is arranged on the second connecting rod and is positioned at one end of the second connecting rod, which is arranged in the spring cavity;

one end of the elastic piece abuts against the outer side wall of the spring cavity, and the other end of the elastic piece abuts against the limiting protrusion.

2. The inner mold assembly of claim 1, wherein the first core and/or the second core are provided with a first drive mechanism at an upper portion thereof;

the first drive mechanism is coupled to the central rod to drive the first mandrel and/or the second mandrel radially outwardly.

3. The inner die assembly of claim 2, wherein the first drive mechanism is a drive ring;

the radial outer peripheral surface of the driving ring is provided with a driving surface, and the driving surface is arranged on at least part of the area of the driving ring;

the inner side surfaces of the upper parts of the first core and/or the second core are provided with matching surfaces, and the matching surfaces and the driving surfaces are matched with each other in the transition process from the open state to the closed state so as to push the upper parts of the first core and the second core to move outwards in the radial direction.

4. An inner die assembly as claimed in claim 3, wherein the drive surface is a conical or inclined surface.

5. The inner mold assembly of claim 1,

the second driving mechanism drives the first core and/or the lower part of the second core to move inwards in the radial direction through the second driving mechanism; the second driving mechanism is arranged on the base of the die.

6. The inner mold assembly of claim 5,

the first elastic piece is arranged at one end of the first core close to the base, and the first elastic piece provides elastic force for enabling the first core to be close to the center rod;

the second elastic piece is arranged at one end, close to the base, of the second core, and the second elastic piece provides elastic force in the direction that the second core is close to the center rod.

7. The inner mold assembly of claim 1,

the lower part of the first core and/or the second core is provided with a guide mechanism;

the guide mechanism moves the first core and the second core in the radial direction of the inner mold assembly.

8. The inner mold assembly of claim 7, wherein the guide mechanism comprises pins, guide holes provided in the lower clamp ring holder, and mating holes provided corresponding to the guide pin holes of the first and second cores;

the pin is movably arranged in one or both of the guide hole and the matching hole;

or,

the guide mechanism is a guide rail mechanism.

9. An inner die assembly as in claim 3 wherein the inner die assembly includes a capsule gripping mechanism;

the capsule clamping mechanism comprises an upper clamping ring, an upper clamping ring conical seat, a lower clamping ring and a lower clamping ring seat;

the upper clamping ring is assembled with the upper clamping ring conical seat to clamp the upper end of the inflatable capsule, and is arranged on the central rod of the vulcanizing machine;

the lower clamping ring is assembled with the lower clamping ring seat to clamp the lower end of the inflatable capsule.

10. The inner die assembly of claim 9, wherein the drive ring is configured as an upper clamp ring.

11. The application method of the internal mold assembly is characterized by comprising the following steps of:

the method of use is based on the inner mold assembly of any of claims 1-10;

in the open state, the core assembly is disengaged from the tire or green tire for smooth loading and unloading of the finished tire; the center rod moves downward to drive the core assembly radially outward;

the core assembly is urged to move radially outwardly by the expansion of the capsule, thereby driving the core assembly from the open condition to the closed condition;

after the tire is vulcanized, the central rod moves upwards, and simultaneously the inflation capsule is deflated and contracted, and the core assembly is contracted inwards in the radial direction; the core assembly is separated from the tire and generates a certain hole due to the movement stroke, so that the tire can be conveniently and smoothly taken down.

12. A tire mold, characterized in that:

the tire mold further comprising the inner mold assembly of any one of claims 1-10.

13. A tyre mould as claimed in claim 12, wherein the upper cover and the base are provided with annular projections, and wherein in the closed condition, the end surfaces of the annular projections and the outer circumferential surfaces of the blocks and the core assembly together define the inner cavity of the cured tyre or tyre blank;

or a supporting structure is arranged between the core assembly and the pattern block, the supporting structure comprises a telescopic spring hole and a supporting seat, and the supporting seat and the spring are arranged in the spring hole; in the mold opening state, the supporting seat extends out of the spring hole under the action of the spring and supports the tread; in the mold closed state, the supporting seat is pressed to retract into the spring hole.