CN220429348U - Tire mold and tire vulcanizing device - Google Patents

Abstract

The present disclosure relates to a tire mold comprising: a mold body, the mold may include a circumferential portion; and a plurality of electric heating units disposed around the circumferential portion, and spaced apart from each other in the circumferential direction. In this way, by a plurality of electric heating units arranged at intervals in the circumferential direction, zoned heating and zoned temperature control of the circumferential portion of the die body can be achieved, so that the heating temperature is more uniform and controllable. In addition, the present disclosure also relates to a tire curing apparatus.

Description

Tire mold and tire vulcanizing device

Technical Field

The application belongs to the technical field of equipment for tire production, and relates to a tire mold and a tire vulcanizing device comprising the tire mold.

Background

In industrial production, vulcanization is often employed to increase the overall hardness of certain materials. For example, tire vulcanization refers to vulcanization of a tire casing by a mold pressurization method. Before vulcanization, the tire is a plastic rubber with viscoelasticity, is easy to deform, has low strength and no use value, and is cured into a high-elasticity rubber with use value through vulcanization.

At present, a tire mold generally adopts a steam heating mode to provide a high-temperature and high-pressure environment in the vulcanization process, but steam is generated by burning fossil energy or heating by using electric energy, so that the tire mold is long in transmission pipeline, large in occupied space, low in conversion efficiency and high in energy waste rate; the existing electric heating tire mold is mostly heated by adopting resistance type, and the electric heating pipe is arranged on the outer side of the mold to heat the tire mold, so that the heating efficiency is low, the energy efficiency ratio is low, the heating speed is low, and the temperature uniformity is poor.

Accordingly, there is a strong need to provide an improved tire mold that overcomes one or more of the shortcomings of the prior art.

Disclosure of Invention

The present disclosure aims to provide a tire mold, particularly an electrically heated tire mold, which can realize zone heating and zone temperature control, and has high heating efficiency, high energy efficiency ratio, high heating speed and good temperature uniformity.

According to one aspect of the present disclosure, a tire mold is provided that may include:

a mold body, which may include a circumferential portion; and

a plurality of electric heating units, which may be arranged around the circumferential portion, and which are spaced apart from each other in the circumferential direction,

wherein each of the electric heating units may include an electrically conductive coil, and the electrically conductive coil is electrically connected to an alternating power source such that an alternating magnetic field is inductively generated in the electrically conductive coil to inductively heat the mold body.

In this way, by a plurality of electric heating units arranged at intervals in the circumferential direction, zoned heating and zoned temperature control of the circumferential portion of the die body can be achieved, so that the heating temperature is more uniform and controllable, and by means of induction heating, the heating rate of the die body is made fast and the heating efficiency is higher.

According to the above aspect of the present disclosure, preferably, the mold body may include a plurality of grooves arranged around the circumferential portion with spaces between adjacent grooves in the circumferential direction, wherein the electric heating unit is disposed in the grooves. Through setting up the recess, on the one hand reserves installation space, and the installation arrangement of conductive coil of being convenient for can protect the coil better, on the other hand, can have better heating effect to heating efficiency has further been improved.

According to the above aspect of the present disclosure, preferably, the tire mold may further include a plurality of blocks provided inside the circumferential portion, wherein the number of the plurality of grooves is N times the number of the blocks, wherein N is an integer ranging from 1 to 10. With this arrangement, the block, and thus the unvulcanized green tire inside thereof, can be heated better to facilitate vulcanization of the green tire. Preferably, the grooves may be circumferentially equally spaced. The arrangement can prevent the adjacent coils from being too close, thereby avoiding the unenergized working coil from being influenced by surrounding energized working coils to generate reverse electromotive force, influencing a circuit and damaging circuit components.

According to the above aspect of the present disclosure, preferably, in order to further improve the heating efficiency, the number of the plurality of grooves may be 2 times the number of the blocks, and two grooves equally spaced in the circumferential direction are provided at positions corresponding to each block.

According to the above aspect of the present disclosure, in order to make it easier to install and arrange the electric heating unit on the circumferential portion and to facilitate subsequent repair/maintenance, it is preferable that the plurality of grooves are rectangular, circular or oval (or elliptical) in shape and are equally spaced in the circumferential direction.

According to the above aspect of the present disclosure, preferably, a magnetic conductive member may be provided radially outside the conductive coil; and/or a magnetic conduction plate is arranged on the inner side wall of the groove. The arrangement enables induction heating to mainly heat the inner wall of the groove, and by arranging the magnetic conduction component, the effect of shielding and converging magnetic induction lines can be achieved, the influence on the work of other coils is further reduced, and the external ferromagnetic part is prevented from being additionally heated, so that the energy consumption is saved, and the external temperature of the circumferential part (or the guide ring) can be prevented from being too high.

According to the above aspect of the present disclosure, preferably, the magnetically permeable member is shaped as a cross-shaped plate body, and the size of the cross-shaped plate body is matched with the size of the groove of the mold body to cover the groove. In this way, the magnetically permeable member may be used to secure the electrically conductive coil within the recess, avoiding damage to the coil during operation.

According to the above aspect of the present disclosure, preferably, the conductive coil may be fixed to the magnetically permeable member, and the magnetically permeable member is detachably fixed to the groove. In this way, the electrically conductive coil and magnetically permeable member may be removed as a unit, further facilitating the mounting of the electrical heating unit to the tire mold and facilitating subsequent repair/maintenance.

According to the above aspects of the present disclosure, in order to achieve better heating efficiency and to facilitate the partition temperature control, it is preferable that the conductive coils are connected in parallel or in series, or that the conductive coils are connected in parallel or in series at intervals.

According to another aspect of the present disclosure, a tire curing device is provided that may include the tire mold of the above aspect, the tire mold being disposed so as to be openable and closable and positioned outside of a curing bladder, and defining a curing chamber with the curing bladder.

The tire mold according to the present disclosure may have beneficial technical effects including, but not limited to, the following:

(1) The conductive coil can realize the zone heating of the tire mold through different wiring modes, and the zone temperature control is more uniform.

(2) The power-on/power-off control can be performed on a certain area, so that the power-on heating of the area which does not reach the preset temperature is realized, and energy is saved.

(3) The conductive coil is simple and convenient to install and arrange, and is easy to maintain and convenient to repair;

(4) The induction heating speed is high, and the heating efficiency is high.

Thus, the tire mold of the present disclosure can meet the use requirements, overcome the drawbacks of the prior art and achieve the intended purpose.

Drawings

For a further clear description of a tire mold according to the present disclosure, the present disclosure will be described in detail below with reference to the attached drawing figures and the detailed description, wherein:

FIG. 1 is a schematic cross-sectional view of a tire curing apparatus according to a non-limiting embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view of a tire mold according to a non-limiting embodiment of the present disclosure;

FIG. 3 is a schematic perspective view of the tire mold shown in FIG. 2, showing the electrical heating units disposed on the circumferential portion;

FIG. 4 is an enlarged view of a portion of the circumferential portion of the tire mold shown in FIG. 3;

FIG. 5 is a schematic top view of a circumferential portion of the tire mold shown in FIG. 1;

FIG. 6 shows a schematic diagram of a magnetically permeable member according to a non-limiting embodiment of the present disclosure; and

fig. 7 is another schematic perspective view of the tire mold shown in fig. 2, showing the electrical connection relationship of the electrical heating unit.

The figures are merely schematic and are not drawn to scale.

List of reference numerals in the figures and examples:

1000-tire curing apparatus comprising:

100-tire mold, comprising:

10-die body, comprising:

11-a circumferential portion;

10A-mold cavity;

20-an electrical heating unit comprising:

21-a conductive coil;

22-a magnetic conductive component;

23-conducting wires;

30-grooves;

40-pattern blocks;

200-vulcanizing the capsule;

300-center mechanism, comprising:

301-ring seat;

302-a central rod;

303-supporting a ring cylinder;

304-internal heating means;

305-an agitation device;

306-a drum;

400-clamping device;

500-heating the plate;

600-lower hot plate.

Detailed Description

It is to be understood that the present disclosure may assume various alternative orientations and step sequences, except where expressly specified to the contrary. It should be further understood that the specific devices illustrated in the accompanying drawings and described in the specification are simply exemplary embodiments of the inventive concepts disclosed and defined herein. Thus, unless explicitly stated otherwise, the particular orientations, directions, or other physical characteristics to which the various embodiments disclosed relate should not be considered limiting.

Fig. 1 is a schematic cross-sectional view of a tire curing apparatus 1000 according to a non-limiting embodiment of the present disclosure. As shown, the tire vulcanizing apparatus 1000 may mainly include a tire mold 100, a curing bladder 200, a center mechanism 300, a clamping device 400, and the like.

The tire mold 100 is a mold for tire curing, and may be a segmented tire mold or a two-part tire mold having an openable and closable arrangement, the interior of which may be enclosed to form a mold cavity. The curing bladder 200 may be a hollow thin-walled rubber article that the curing bladder 200 may be collapsed to facilitate placement inside an unvulcanized green tire or removal from a vulcanized tire. The curing bladder 200 may be expanded to mate with the tire mold 100. For example, the tire mold 100 may be positioned outside of the expanded curing bladder 200, defining a curing chamber with the curing bladder 200. An unvulcanized green tire may be placed in the vulcanization chamber and the heat required for vulcanization of the green tire is supplied by heating the tire mold 100 and the curing bladder 200. In addition, the pressure required for vulcanizing the green tire is supplied together by pressurizing the vulcanization bladder 200 from the inside and pressurizing the tire mold 100 from the outside. Details of the tire mold 100 according to the present disclosure will be described in further detail below.

The central mechanism 300 may mainly include a ring holder 301, a central rod 302, a support ring drum 303, a heating device 304, an agitating device 305, a drum 306, and a rotation driving part (e.g., a motor not shown in fig. 1), etc.

The ring seat 301 may be provided inside the tire mold 100 for supporting the corresponding rotating components (e.g., bearings, drums, etc.), and providing a gas passage for a heating medium (e.g., nitrogen, etc.) to enter or leave the curing bladder 200. The ring seat 301 may be provided with a central opening with which the support ring cylinder 303 may cooperate to support the ring seat 301.

The central rod 302 extends through this central opening in the ring seat 301 and is movable up and down. The upper end of the central rod 302 is fixed to the curing bladder 200 by means of a clamping device 400 to enable the curing bladder 200 to be folded or expanded as the central rod 302 moves up and down.

The support ring drum 303 is used to support the various parts of the central mechanism 300 and its hollow part is used for the passage of the central rod 302 and possibly the rotation transmission components (e.g. drums etc.).

The heating device 304 may be provided in the curing bladder 200 and heat the heating medium. In this embodiment, the heating device 304 is built-in. By way of example, the heating device 304 may be an annular heating source, such as an inductive or resistive heating element disposed circumferentially about the central rod 302, or a combination thereof.

The stirring device 305 may be disposed adjacent to the heating device 304, and the medium heated by the heating device 304 is stirred by the stirring device 305, so that the temperature of the medium is homogenized inside the curing bladder 200. The agitation device 305 may be, for example, an impeller, a fan, or the like. The stirring device 305 may be driven to rotate by a rotation driving part not shown in the drawings. The rotary drive component may be, for example, an electric motor and comprises a stator and a rotor, wherein the rotor is directly or indirectly coupled to the agitation device 305.

The clamping device 400 may comprise an upper clamping assembly and a lower clamping assembly, which clamp the upper and lower clamping edges of the curing bladder 200, respectively, wherein the lower clamping assembly may be fixed outside the ring seat 301 and fixed to the upper end of the central rod 302 at the top of the central mechanism 300.

Fig. 2 is a schematic cross-sectional view of a tire mold 100 according to a non-limiting embodiment of the present disclosure. As shown and as a non-limiting example, a tire mold 100 according to the present disclosure may mainly include a mold body 10 and a plurality of electric heating units 20, thereby being an electrically heated tire mold. In the embodiment shown in fig. 2, the mold body 10 may include a circumferential portion 11. The die body 10 may be a guide ring or a die sleeve of a die and have a generally cylindrical shape.

The mold body 10 may enclose a mold cavity 10A, which mold cavity 10A may be used to house a tire as well as a curing bladder. In addition, the tire mold 10 may also include blocks 40 (or sectors) or the like. For example, the blocks 40 may be of a petal-type structure, and adjacent blocks 40 can be moved closer or farther apart relative to one another to vary the size of the chambers enclosed therein to facilitate placement and removal of the tire.

With continued reference to fig. 2, a plurality of electric heating units 20 may be provided on the mold body 10 for heating the mold body 10 using electric power. In addition, the tire vulcanizing apparatus 1000 may further include an upper hot plate 500 and a lower hot plate 600.

In the embodiment of fig. 2, a plurality of electric heating units are arranged around the circumferential portion 11, and adjacent electric heating units are spaced apart in the circumferential direction. In this way, a plurality of electrically heated cells are formed on the circumferential portion 11 of the die body 10.

Each electric heating unit 20 comprises an electrically conductive coil 21 with an insulating layer and the electrically conductive coil is electrically connected to an alternating power source such that an alternating magnetic field is inductively generated or induced in the electrically conductive coil 21 to inductively heat the mould body 10.

The conductive coil 21 may be arranged in an arcuate surface, such as wound on an arcuate surface, to closely conform to the outer surface of the circumferential portion 11, or the conductive coil 21 may be arranged in a substantially flat winding plane for ease of manufacture and installation. As another example, the conductive coil 21 may be a coiled separate component and may optionally fit into a groove 30 on the outer surface of the circumferential portion 11.

As shown in fig. 3, grooves 30 may be provided on the mold body 10, and a plurality of grooves 30 may be arranged around the circumferential portion 11 with spaces between adjacent grooves in the circumferential direction. Preferably, each groove is equally spaced and has substantially the same shape and size.

Fig. 4 is an enlarged view of a portion of the circumferential portion 11 of the tire mold 10 shown in fig. 3. As best shown in fig. 4, the conductive coil 21 is disposed in the recess 30 and has corresponding electrical connection terminals.

According to a preferred embodiment of the present disclosure, the number and location of grooves 30 may correspond to blocks 40. For example, N grooves 30 are arranged in the corresponding sector of each block 40, where N is an integer, such as 1, 2, 3 … …, etc.

Fig. 5 is a schematic top view of the circumferential portion 11 of the tire mold 10 shown in fig. 1.

As shown, the tire mold 10 has 8 blocks 40, the blocks 40 may be of a petal configuration, and adjacent blocks 40 can be moved toward and away from each other to vary the size of the chamber enclosed therein to facilitate placement and removal of the tire. In the example of fig. 5, the number of grooves 30 is the same as the number of blocks 40, and is also 8, i.e., each block 40 corresponds to 1 groove 30. In an alternative embodiment, the number of grooves 30 is 2 times the number of blocks 40, and two grooves 20 spaced apart in the axial direction (or in the thickness direction of the tire mold 10) are provided at positions corresponding to each block 40, each groove 20 crossing the sector area corresponding to the block 40.

Alternatively, two grooves 20 equally spaced in the circumferential direction may be provided at positions corresponding to each block 40, each groove 20 having a circumferential span of about half the span of the sector area to which the block 40 corresponds. The arrangement can prevent the adjacent coils from being too close, thereby avoiding the unenergized working coil from being influenced by surrounding energized working coils to generate reverse electromotive force, influencing a circuit and damaging circuit components.

As another alternative embodiment, as shown in fig. 3, in the sector area to which each block 40 corresponds, 3 grooves 30 spaced apart in the circumferential direction may be provided, each groove 30 being substantially rectangular. Of course, other shapes of the grooves 30 are conceivable by those skilled in the art, such as circular, oblong, oval, etc., and their intervals in the circumferential direction may be the same or different.

According to the present disclosure, a magnetically permeable member may be provided radially outward of the electrically conductive coil 21. Fig. 6 shows a schematic view of a magnetically permeable member 22 according to a non-limiting embodiment of the present disclosure.

As shown and as a non-limiting example, the magnetically permeable member 22 may be shaped as a cross-shaped plate body, and the dimensions of the cross-shaped plate body match the dimensions of the recess 30 of the die body 10 to close the recess. The description "cover" as used herein means that the length and width of the cross-shaped plate body is greater than the length and width of the groove 30 so as to be able to be snapped outside the groove 30 without entering the groove 30. For example, as shown in the drawings, the cross-shaped magnetically permeable member 22 is tightly fitted to four sides of the recess 30.

Preferably, the conductive coil 21 may be fixed to the magnetically permeable member 22, and the magnetically permeable member 22 may be detachably fixed to the recess 30. For example, an engagement groove may be provided on the side of the groove 30, and the magnetic conductive member 22 may be engaged with the groove 30 through the engagement groove. In alternative embodiments, the magnetically permeable member 22 may also be bolted directly to the recess 30, such as by threaded fasteners or the like. At this time, it is further preferable that a magnetic conductive plate (not shown in the drawing) may be provided on the inner side wall of the groove 30. The magnetic conductive plate and the magnetic conductive component 22 can respectively or jointly restrict the magnetic induction line, so that heat is mainly concentrated on the inner wall of the groove, and the heat is better transferred to the die body.

The material of the magnetic conductive member 22 and the magnetic conductive plate may be a material having high magnetic permeability and high electric resistivity, and may be ferrite, multi-piece silicon steel, or the like. Through setting up magnetic conduction part 22, play the effect of shielding and beam converging magnetic induction line, prevent to carry out extra heating to outside ferromagnetic part, save the energy consumption, and can prevent that the outside temperature of guide ring is too high. Meanwhile, as described above, the magnetic conductive member 22 may also function to fix the conductive coil 21 in the groove 30. As an example, the magnetically permeable plate may be a thin sheet structure and conform to the shape of the inner sidewall of the groove 30 to better fit into the groove 30.

Fig. 7 is another schematic perspective view of the tire mold 100 shown in fig. 2, showing an electrical connection relationship of the electric heating unit 20.

In the embodiment shown in fig. 7, the conductive coils 21 are connected in series at intervals via wires 23. For example, the conductive coils 21 may be connected in series with each other as shown, or the conductive coils 21 may be connected in series with each other with an interval of about 90 degrees in the circumferential direction. It should be noted that the arrangement of the wires 23 shown in the drawings is merely illustrative for explaining the connection relationship between the conductive coils 21.

According to the present disclosure, each of the conductive coils 21 may be electrically connected to an alternating power source, such as a high frequency alternating power source, after being connected in series or parallel via the wires 23. In this way, an alternating current is formed in the conductive coil 21, which generates an alternating magnetic field, thereby inducing eddy currents in nearby components, thereby heating or transferring heat to components such as the mold body 10 and the blocks 40 to raise the temperature of the tire mold 100 to a desired temperature. In this way, it is possible to achieve heating of the tire from the outside in an electromagnetic induction manner to cooperate with the curing bladder 200, thereby completing curing of the tire.

In an embodiment in which the conductive coils 21 are connected in parallel, the temperature of each region may be detected and may be switched by a relay or solenoid valve to energize the corresponding conductive coil 21. Alternatively, a plurality of high frequency elements may be used to calculate the difference between this zone temperature and the set temperature to adjust the heating power (including but not limited to PFM, PDM, PWM, adjustment ranging between 5% -100%). For example, the control system can be regulated by a PLC or an industrial computer or a single chip microcomputer, and the reaction time can be controlled at microsecond level, so that the temperature of the die body 10 can be controlled more accurately. Meanwhile, the system can set different temperatures at different positions, so that zonal heating is realized.

In an embodiment in which the conductive coils 21 are connected in series, it is possible to ensure uniform heating when heating by means of the conductive coils 21. The electric conduction coil 21 is mainly characterized in that each electric conduction coil 21 passes through the same current, so that the inductance, the power and the heating value of each electric conduction coil 21 are the same, even heating is realized, the number of temperature measuring elements and corresponding temperature conversion modules can be reduced, and meanwhile, the requirement on a control element is reduced due to the reduction of the data processing load. For example, accurate control can be achieved by means of a single-chip microcomputer. In addition, PLC, industrial computer etc. can also realize more accurate control.

It can be seen that the conductive coil 21 according to the present disclosure can realize zone heating by different wiring modes, zone temperature control is more uniform, and local overheating which may occur in the individual connection can be avoided.

In addition, through adjusting the mode of connection, can carry out on-off control to a certain region, can only be to the region electrical heating that does not reach predetermined temperature, energy saving.

In another embodiment, the conductive coils 21 may be connected in parallel at intervals. Of course, the person skilled in the art can directly connect the conductive coils 21 in parallel or in series without spacing.

It can be seen that the arrangement of the conductive coil 21 is easy to achieve and the maintenance is convenient according to the embodiment of the present disclosure. In addition, since the conductive coil 21 can realize induction heating, the mold temperature rise speed is high and the heating efficiency is high.

The terms "upper", "lower", and the like, as used herein to indicate orientation or orientation, are merely for better understanding of the concepts of the present disclosure as shown in the preferred embodiments by those of ordinary skill in the art, and are not intended to limit the present disclosure. Unless otherwise indicated, all orders, orientations, or orientations are used solely for the purpose of distinguishing one element/component/structure from another element/component/structure, and do not denote any particular order, order of operation, direction, or orientation unless otherwise indicated. For example, in alternative embodiments, the "upper portion" may be the "lower portion" and the "first end" may alternatively refer to the "second end".

In view of the foregoing, tire mold 100 according to embodiments of the present disclosure overcomes the shortcomings of the prior art and achieves the intended inventive objectives.

While the tire mold of the present disclosure has been described in connection with a preferred embodiment, it will be appreciated by those of ordinary skill in the art that the foregoing examples are intended to be illustrative only and are not to be construed as limiting the present disclosure. Accordingly, various modifications and variations of the present disclosure may be made within the spirit of the claims, and such modifications and variations are intended to be within the scope of the claims of the present disclosure.

Claims (10)

1. A tire mold (100), characterized in that it comprises:

-a mould body (10) comprising a circumferential portion (11); and

a plurality of electric heating units (20) arranged around the circumferential portion (11) with spaces between adjacent electric heating units in the circumferential direction,

wherein each of the electric heating units (20) comprises an electrically conductive coil (21) and the electrically conductive coils are electrically connected to an alternating power source such that an alternating magnetic field is inductively generated in the electric heating unit (20) to inductively heat the mould body (10).

2. Tyre mould (100) according to claim 1, wherein the mould body (10) comprises a plurality of grooves (30) arranged around the circumferential portion (11) and spaced apart in a circumferential direction between adjacent grooves (30), wherein the electrically conductive coil (21) is arranged in the grooves (30).

3. The tire mold (100) according to claim 2, wherein the tire mold (100) further comprises a plurality of blocks (40) disposed inside the circumferential portion (11), wherein the number of the plurality of grooves (30) is N times the number of the blocks (40), wherein N is an integer ranging from 1 to 10.

4. A tire mold (100) according to claim 3, wherein the number of the plurality of grooves (30) is 2 times the number of the blocks (40), and two grooves (30) equally spaced in the circumferential direction are provided at positions corresponding to each block (40).

5. Tyre mould (100) according to claim 2, wherein said plurality of grooves (30) are rectangular, circular or oval in shape and are equally spaced in the circumferential direction.

6. Tyre mould (100) according to any one of claims 2 to 5, wherein a magnetically permeable member (22) is provided radially external to said electrically conductive coil (21);

and/or a magnetic conductive plate is arranged on the inner side wall of the groove (30).

7. The tire mold (100) of claim 6, wherein the magnetically permeable member (22) is shaped as a cross-shaped plate and the cross-shaped plate is sized to mate with the size of the recess (30) of the mold body (10) to cover the recess (30).

8. Tyre mould (100) according to claim 7, wherein said electrically conductive coil (21) is fixed to said magnetically conductive member (22) and said magnetically conductive member is removably fixed to said recess (30).

9. Tyre mould (100) according to any one of claims 1 to 5, wherein said conductive coils (21) are connected in parallel or in series or wherein said conductive coils (21) are connected in parallel or in series at intervals.

10. Tyre vulcanisation apparatus, comprising a tyre mould (100) according to any of claims 1-9, which is arranged to be openable and closable and is positioned outside a vulcanisation bladder, defining together with said vulcanisation bladder a vulcanisation chamber.