CN113085235B - Stepped tire direct pressure vulcanization inner mold - Google Patents

Abstract

The invention relates to an inner die of a tire direct-pressure vulcanizing machine, belonging to the field of tire production equipment. The telescopic mechanism comprises a wide tile, a wide tile electromagnetic plate, a wide tile bracket, a narrow tile electromagnetic plate and a narrow tile bracket. The transmission mechanism comprises a piston inner rod, a piston outer rod, an end cover, a clamping ring, a sleeve, a threaded sleeve, a wide tile wedge block, a wide tile sliding rail, a wide tile sliding block, a narrow tile wedge block, a narrow tile sliding rail, a narrow tile sliding block, a novel sliding block and a bottom plate limiting plate. The novel sliding block designed by the invention consists of a bearing seat, a bearing shaft, an elastic retainer ring and a deep groove ball bearing, wherein the bearing seat is divided into an upper part and a lower part, and is fixedly connected to the bottom ends of a narrow tile bracket and a wide tile bracket through connecting bolts. According to the invention, the inner space is reserved in a mode of axially moving upwards after the radial contraction of the narrow tile is completed, so that the expansion and contraction ratio of the inner die of the tire is improved, and the tire specification range applicable to the inner die of the tire is enlarged.

Description

Stepped tire direct pressure vulcanization inner mold

Technical Field

The invention relates to the field of tire production equipment, and in particular to an inner mold of a tire direct pressure vulcanizer.

Background Art

Vulcanization is a key process in tire manufacturing, and tire vulcanization technology mainly relies on tire shaping vulcanizers. The inner mold of the traditional shaping vulcanizer is a capsule, which uses steam or nitrogen to provide vulcanization temperature and vulcanization pressure. However, the capsule is a flexible material, and the vulcanization pressure is insufficient. It cannot repair the defect of uneven distribution of tire rubber. The finished tires manufactured have poor precision, and the capsule has poor thermal conductivity, short life and frequent replacement. Patent ZL20131057519 mentions a tire vulcanization inner mold, which realizes radial expansion of the mold through a rigid mechanical mechanism, replaces the flexible capsule to vulcanize the tire, has high mechanical precision, can greatly increase the vulcanization pressure, can improve the flow distribution of the rubber in the molten state, and solves the problem of frequent replacement of the capsule. However, the inner mold can only be adapted to tire models with large tire size and low cross-section, and cannot achieve vulcanization of tires with smaller size and higher cross-section. The reason is that the wide tiles and narrow tiles of the inner mold need to shrink into the same layer of space, thus limiting the expansion and contraction ratio of the direct pressure vulcanization inner mold. The expansion-contraction ratio of the inner mold is the ratio of the radius of the inner mold expansion limit position to the radius of the circumscribed circle of the inner mold contraction limit position. It indicates the extent to which the drum shell can move freely in the radial direction and is a parameter indicator to measure the applicable range of the inner mold for direct pressure vulcanization. The larger the expansion-contraction ratio of the inner mold, the better the elasticity of the metal inner mold and the wider the applicable tire specification range. The central mechanism of the tire vulcanization inner mold of patent ZL20131057519 is a whole wedge-shaped seat with a complex structure, difficult processing, and no adjustability. When the central mechanism fails, it cannot be solved by replacing parts, and it is difficult to adapt to the complex and changeable working environment of the factory.

Summary of the invention

The purpose of the present invention is to propose a new type of stepped direct pressure vulcanization inner mold to address the defects of the existing direct pressure vulcanization inner mold, such as small application range, large friction during movement, and complex processing of the central mechanism. The present invention adopts a stepped structure, and through the axial upward movement of the narrow tile after radial contraction, the internal space is released to provide space for the contraction of the wide tile, and the applicable tire flatness is increased from 30% to 55%, which significantly improves the expansion and contraction ratio of the tire inner mold, expands the tire specification range applicable to the tire direct pressure vulcanization inner mold, and fundamentally solves the problem that the components of the original inner mold are easy to interfere with each other during the contraction process, and the expansion and contraction ratio is too small to adapt to general tire models. The new slider designed in the present invention is fixedly connected to the bottom of the narrow tile bracket and the wide tile bracket by connecting bolts. When the wide tile or the narrow tile shrinks, the new slider changes the original surface contact into line contact, and the rolling of the bearing reduces the friction and wear when the inner mold shrinks. When the finished tire is demolded and the narrow tile mechanism needs to be lowered back to the same plane as the wide tile, the new slider makes the process of connecting the narrow tile bracket back to the T-shaped guide rail of the bottom plate limit plate smoother, ensuring that the entire movement process of the mechanism is smooth and fluent. The central mechanism of the present invention is divided into four main components: the piston inner rod, the piston outer rod, the wide tile wedge block and the narrow tile wedge block, which reduces the overall complexity, solves the problem of complex structure of the central mechanism, and improves the adaptability of the stepped direct pressure vulcanization inner mold.

The technical solution adopted by the present invention to solve its technical problems is: a stepped tire direct pressure vulcanization inner mold, including a telescopic mechanism and a transmission mechanism, the telescopic mechanism includes a wide tile, a wide tile electromagnetic plate, a wide tile bracket, a narrow tile, a narrow tile electromagnetic plate and a narrow tile bracket. The transmission mechanism includes a piston inner rod, a piston outer rod, an end cover, a clamping ring, a sleeve, a threaded sleeve, a wide tile wedge, a wide tile slide rail, a wide tile slider, a narrow tile wedge, a narrow tile slide rail, a narrow tile slider, a new slider and a bottom plate limit plate, and the bottom plate limit plate is fixed on the base of the tire shaping vulcanizer; the piston inner rod is coaxial with the piston outer rod, and the spline part at the top of the piston inner rod is 7 large teeth and 7 small teeth arranged evenly spaced in the circumferential direction, the spline large teeth are fixedly connected to the wide tile wedge, and the spline small teeth are matched with the inner groove of the piston outer rod. The piston outer rod has 7 centripetal skeletons, the spacing distance is consistent with the width of the spline large teeth of the piston inner rod, and the outer side of the centripetal skeleton is fixedly connected to the narrow tile wedge. The end cover is connected to the narrow tile wedge block by bolts, and the end cover is fixed to the piston outer rod by a clamp ring; the wide tile and the narrow tile are fixed to the wide tile bracket and the narrow tile bracket respectively, and the wide tile bracket and the narrow tile bracket are in contact with the bottom plate limit plate through a specially designed new slider, and the drum tile bracket and the drum tile wedge block are in contact through a guide slider. The specially designed new slider consists of a socket, a bearing shaft, a circlip and a deep groove ball bearing. The socket is divided into two parts, upper and lower, and is fixed to the bottom of the narrow tile bracket and the wide tile bracket by connecting bolts.

The present invention can be implemented in the following manner: the number of wide tiles and narrow tiles is consistent (the number of wide tiles and narrow tiles is not limited to 7, and the number of matching parts connected thereto is the same as the number of wide tiles and narrow tiles, and the number is determined according to the size of the processed tire, and is generally an odd number), the wide tiles and narrow tiles are arranged alternately along the circumferential direction, and when the inner mold is in the maximum expansion state, all the wide tiles and narrow tiles together form an appearance consistent with the contour of the inner cavity of the finished tire; when in the minimum contraction state, the wide tiles and narrow tiles are distributed in a stepped manner, with the narrow tiles on the top and the wide tiles on the bottom, and both are within the diameter of the bead opening of the finished tire.

The piston inner rod is composed of a smooth axis part and a spline part. The spline part consists of 7 large teeth and 7 small teeth arranged evenly spaced in the circumferential direction. The large spline teeth are fixedly connected to the wide tile wedge to transmit power for the wide tile movement; the small spline teeth cooperate with the guide rail on the inner side of the piston outer rod to prevent the center mechanism from rotating during movement.

The piston outer rod structure is composed of 7 centripetal skeletons extending from a cylindrical base. The centripetal skeletons are evenly arranged in the circumferential direction. The interval width between two centripetal skeletons is consistent with the width of the large spline teeth on the piston inner rod, ensuring that the piston inner rod can move up and down inside the piston outer rod; there is a layer of steps on the outside of the centripetal skeleton, which cooperates with the steps on the narrow washer wedge block to support the narrow washer wedge block, reducing the stress on the connecting bolts between the narrow washer wedge block and the piston outer rod, making the overall force more reasonable; an inner groove is opened on the inside of the centripetal skeleton as a guide rail that cooperates with the small spline teeth of the piston inner rod.

The sleeve and the threaded sleeve are respectively installed on the inner side and the outer side of the bottom of the piston outer rod, and play the role of supporting the piston outer rod and enhancing the ability of the piston outer rod to withstand radial force.

The upper side surface of the narrow tile wedge block is fixedly connected to the end cover and is fixedly connected to the inner rod of the piston through a clamp ring and connecting bolts.

The guide rail is fixedly connected to the narrow tile wedge block and the wide tile wedge block by connecting bolts. The end of the guide rail on the narrow tile wedge block is provided with a limit plate to limit the movement of the slider on the guide rail. By cooperating with the piston outer rod, the overall axial movement of the narrow tile mechanism is realized to make room for the internal space for the contraction of the wide tile.

The new slider is composed of a socket, a bearing shaft, an elastic retaining ring and a deep groove ball bearing. The socket is divided into two parts, the upper and lower parts. The new slider is fixed to the bottom of the narrow tile bracket and the wide tile bracket by connecting bolts. When the wide tile or the narrow tile shrinks, the new slider changes the original surface contact into line contact, and the rolling of the bearing reduces the friction and wear during shrinkage. When the finished tire is demoulded and the narrow tile mechanism needs to be lowered back to the same plane as the wide tile, the new slider makes the process of connecting the narrow tile bracket back to the T-shaped guide rail of the bottom plate limit plate smoother, ensuring that the entire movement process of the mechanism is smooth and smooth.

The beneficial effects of the present invention are as follows: adopting a stepped direct pressure vulcanization inner mold structure, the inner space is freed by moving axially upward after the radial contraction of the narrow tile is completed, providing space for the contraction of the wide tile, solving the problem of interference between the components during the contraction of the inner mold, improving the expansion and contraction ratio of the tire direct pressure vulcanization inner mold, and expanding the tire specification range applicable to the tire inner mold. The rigid mechanical mechanism of the stepped direct pressure vulcanization inner mold realizes the radial expansion of the mold, has high mechanical precision, can greatly improve the vulcanization pressure, and thus improve the uniformity and dynamic balance of the finished tire. The structure is stable and has high strength, and the tire vulcanization manufacturing can be carried out for a long time, solving the problem of short capsule life and frequent replacement in the original process. The central mechanism of the stepped direct pressure vulcanization inner mold is decomposed into four main parts: the piston inner rod, the piston outer rod, the wide tile wedge and the narrow tile wedge, which reduces the complexity of the central mechanism and improves the adaptability of the stepped direct pressure vulcanization inner mold.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a cross-sectional view of the stepped tire direct pressure vulcanization inner mold of the present invention in an expanded state.

2 is a cross-sectional view of the stepped tire direct pressure vulcanization inner mold in a contracted state according to the present invention.

FIG3 is an external view of the stepped tire direct pressure vulcanization inner mold of the present invention in an expanded state.

FIG. 4 is an external view of the narrow shoe of the inner mold for direct pressure vulcanization of the stepped tire of the present invention in a contracted state.

5 is an external view of the narrow shoe of the inner mold for direct pressure vulcanization of the stepped tire of the present invention in a raised state.

FIG. 6 is an external view of the stepped tire direct pressure vulcanization inner mold of the present invention in a fully contracted state.

FIG. 7 is a diagram showing the piston outer rod of the stepped tire direct pressure vulcanization inner mold of the present invention.

FIG8 is a diagram of the inner piston rod of the stepped tire direct pressure vulcanization inner mold of the present invention.

FIG. 9 is a new type of slider of the stepped tire direct pressure vulcanization inner mold of the present invention.

In the figure: 1-narrow tile, 2-narrow tile electromagnetic plate, 3-narrow tile bracket, 4-narrow tile slider, 5-narrow tile slide rail, 6-narrow tile wedge, 7-end cover, 8-clamp ring, 9-piston outer rod, 10-piston inner rod, 11-wide tile wedge, 12-wide tile slide rail, 13-wide tile slider, 14-wide tile bracket, 15-wide tile electromagnetic plate, 16-wide tile, 17-new slider, 18-bottom plate limit plate, 19-threaded sleeve, 20-sleeve, 21-upper bearing seat, 22-bearing shaft, 23-elastic retaining ring, 24-lower bearing seat, 25-deep groove ball bearing.

DETAILED DESCRIPTION

The step-type tire direct pressure vulcanization inner mold of the present invention includes a telescopic mechanism and a transmission mechanism, as shown in Figures 1 and 2, wherein the telescopic mechanism is mainly composed of a narrow tile telescopic mechanism and a wide tile telescopic mechanism. The narrow tile telescopic mechanism includes: a narrow tile 1, a narrow tile electromagnetic plate 2 and a narrow tile bracket 3; the wide tile telescopic mechanism includes: a wide tile 16, a wide tile electromagnetic plate 15, and a wide tile bracket 14. The transmission mechanism includes: a piston inner rod 10, a piston outer rod 9, an end cover 7, a clamping ring 8, a sleeve 20, a threaded sleeve 19, a wide tile wedge 11, a wide tile slide rail 12, a wide tile slider 13, a narrow tile wedge 6, a narrow tile slide rail 5, a narrow tile slider 4, a new slider 17 and a bottom plate limit plate 18. The bottom plate limit plate 18 is fixed on the base of the tire shaping vulcanizer; the piston inner rod 10 is coaxial with the piston outer rod 9; the end cover 7 is connected to the narrow tile wedge block 6 by bolts, the end cover 7 is fixed to the piston outer rod 9 by the clamp ring 8, and the piston outer rod 9 is fixed to the narrow tile wedge block 6 by bolts; the wide tile wedge block 11 is connected and fixed to the piston inner rod 10 by welding; the wide tile 16 and the narrow tile 1 are distributed and fixed on the wide tile bracket 14 and the narrow tile bracket 3; the wide tile bracket 14 and the narrow tile bracket 3 are in contact with the bottom plate limit plate 18 through a specially designed new slider 17, and the drum tile bracket is in contact with the drum tile wedge block by a guide slider.

The piston outer rod 9 moves axially upward, driving the narrow tile wedge 6 to move upward, and the T-shaped guide rail of the bottom plate limit plate 18 limits the vertical upward movement of the narrow tile bracket 3, and the narrow tile bracket 3 drives the narrow tile 1 to shrink radially, as shown in Figure 4. After the shrinkage is completed, the narrow tile bracket 3 is freed from the restriction of the T-shaped guide rail of the bottom plate limit plate 18, and is driven by the piston outer rod 9 to continue to move axially upward to make room for the internal space, as shown in Figure 5. Then the piston inner rod 10 drives the wide tile wedge 11 to move axially upward, and similarly, the T-shaped guide rail of the bottom plate limit plate 18 limits the vertical upward movement of the wide tile bracket 14, and the wide tile bracket 14 drives the wide tile 16 to shrink radially on the T-shaped guide rail of the bottom plate limit plate 18, completing the shrinkage process of the narrow tile 1 and the wide tile 16 of the entire inner mold, as shown in Figure 6.

When the narrow shoe 1 shrinks to the limit position, the narrow shoe bracket 3 loses the limiting effect of the T-shaped guide rail of the bottom plate limit plate 18, and the narrow shoe slider 4 reaches the end of the narrow shoe slide rail 5. There is a limit plate at the end of the narrow shoe slide rail 5, which prevents the narrow shoe slider 4 from continuing to slide downward. Driven by the piston outer rod, the entire narrow shoe mechanism moves axially upward.

The new slider 17 is composed of an upper receiving seat 21, a lower receiving seat 24, a bearing shaft 22, an elastic retaining ring 23 and a deep groove ball bearing 25, as shown in Figure 9. The upper receiving seat 21 and the lower receiving seat 24 are connected to the bottom of the narrow tile bracket 3 and the wide tile bracket 14 by connecting bolts. The upper receiving seat 21 has a square shape, and the lower receiving seat 24 has a semicircular shape. The bearing shaft 22 is clamped between the upper receiving seat 21 and the lower receiving seat 24. When the wide tile 16 or the narrow tile 1 shrinks, the new slider 17 changes the original surface contact into a line contact, and the rolling of the bearing reduces the friction and wear during shrinkage. When the finished tire is demoulded and the narrow tile mechanism needs to be lowered back to the same plane as the wide tile 16, the new slider makes the process of connecting the narrow tile bracket 3 back to the T-shaped guide rail of the bottom plate limit plate 18 smoother, ensuring that the entire movement process of the mechanism is smooth and smooth.

The piston inner rod 10 is composed of a smooth axis part and a spline part. The spline part consists of 7 large teeth and 7 small teeth evenly spaced in the circumferential direction, as shown in Figure 8. The large spline teeth are fixedly connected to the wide shoe wedge 11 to transmit power for the movement of the wide shoe 16; the small spline teeth cooperate with the guide rail on the inner side of the piston outer rod 9 to prevent the center mechanism from rotating during movement.

The structure of the piston outer rod 9 is that 7 centripetal skeletons extend from a cylindrical base, and the centripetal skeletons are evenly arranged in the circumferential direction. The interval width between two centripetal skeletons is consistent with the width of the large spline teeth on the piston inner rod 10, as shown in Figure 7, ensuring that the piston inner rod 10 can move up and down inside the piston outer rod 9; there is a layer of steps on the outside of the centripetal skeleton, which cooperates with the steps on the narrow washer wedge block 6 to support the narrow washer wedge block 6, thereby reducing the stress on the connecting bolts between the narrow washer wedge block 6 and the piston outer rod 9, making the overall force more reasonable; an inner groove is opened on the inner side of the centripetal skeleton, which serves as a guide rail for cooperating with the small spline teeth of the piston inner rod 10.

The stepped direct pressure vulcanization inner mold of the present invention has tiles composed of wide tiles 16 and narrow tiles 1 arranged alternately along the circumferential direction. When the inner mold is in the maximum expansion state, all tiles together form an appearance consistent with the contour of the inner cavity of the finished tire, as shown in Figure 3; when in the minimum contraction state, the tiles overlap each other in a limited space and are all within the diameter of the bead opening of the finished tire to facilitate tire unloading. Electromagnetic induction heating components are arranged on the inner side of the narrow tile 1 and the wide tile 16. During vulcanization, high-frequency alternating current passes through the components, causing eddy current effects to be generated inside the narrow tile 1 and the wide tile 16, thereby achieving heating of the inner mold tiles. The number of wide tiles 16 is the same as that of narrow tiles 1, and the total number of tiles is 14.

The specific steps of vulcanizing the tire using the present invention are:

1) Tire loading: The limit plate is at a certain height from the lower steel ring to ensure that the bottom of the drum shoe does not interfere with the lower steel ring when the mold expands or contracts. At the same time, the inner mold of the present invention is in a fully contracted state, and the tire to be vulcanized is placed on the vulcanizing machine.

2) Shaping: The limit plate and the base of the center mechanism remain stationary, the inner rod 10 of the central mechanism piston descends, and after reaching the limit position, the outer rod 9 of the piston descends, and the wide tile wedge block 11 and the narrow tile wedge block 6 move with the piston inner rod 10 and the piston outer rod 9 respectively, and drive the telescopic mechanism to expand radially through the cooperation of the guide rail and the slider, and stop the action when the wide tile 16 and the narrow tile 1 are fully opened. At this time, the tire blank is supported and fixed by the drum tile, and then the central mechanism moves down, and the inner mold together with the tire blank is placed on the lower steel ring.

3) Mold closing: The flexible mold is closed. At this time, the upper cover of the flexible mold presses the upper end surface of the clamp ring to limit the center mechanism to prevent excessive surface pressure on the wide tile 16 and the narrow tile 1 during vulcanization, which causes the piston inner rod 10 and the piston outer rod 9 to rise and cause the wide tile 16 and the narrow tile 1 to shrink. The upper steel ring clamps the upper surface of the wide tile 16 and the narrow tile 1 and the tire blank, so that the tire blank is in the closed space formed by the wide tile 16, the narrow tile 1, the flexible mold, the upper steel ring and the lower steel ring.

Claims (3)

1. A stepped tire direct pressure vulcanization inner mold, characterized in that it includes a telescopic mechanism and a transmission mechanism, the telescopic mechanism includes a wide tile, a wide tile electromagnetic plate, a wide tile bracket, a narrow tile, a narrow tile electromagnetic plate and a narrow tile bracket, the transmission mechanism includes a piston inner rod, a piston outer rod, an end cover, a clamping ring, a sleeve, a threaded sleeve, a wide tile wedge, a wide tile slide rail, a wide tile slider, a narrow tile wedge, a narrow tile slide rail, a narrow tile slider, a slider and a bottom plate limit plate, the bottom plate limit plate is fixed on the base of the tire shaping vulcanizer; the piston inner rod and the piston outer rod are the same The piston inner rod is composed of a smooth axis part and a spline part. The spline part at the top of the piston inner rod is composed of 7 large teeth and 7 small teeth arranged evenly in the circumferential direction. The large spline teeth are fixedly connected to the wide tile wedge to transmit power for the wide tile movement; the small spline teeth cooperate with the guide rail on the inner side of the piston outer rod to prevent the center mechanism from rotating during movement; the piston outer rod structure is composed of 7 centripetal skeletons extending from the cylindrical base. The centripetal skeletons are evenly arranged in the circumferential direction. The interval width of the two centripetal skeletons is consistent with the width of the large spline teeth on the piston inner rod, ensuring the piston The inner rod moves up and down inside the piston outer rod; the outer side of the centripetal frame is fixedly connected to the narrow tile wedge block, and the outer side of the centripetal frame has a step, which cooperates with the step on the narrow tile wedge block to support the narrow tile wedge block, reducing the stress on the connecting bolts between the narrow tile wedge block and the piston outer rod, making the overall force more reasonable; an inner groove is opened on the inner side of the centripetal frame as a guide rail that cooperates with the spline teeth of the piston inner rod; the sleeve and the threaded sleeve are respectively installed on the inner and outer sides of the bottom of the piston outer rod, supporting the piston outer rod and reinforcing The piston outer rod is subjected to the action of radial force; the end cover is connected to the narrow tile wedge block by bolts, and the end cover is fixed to the piston outer rod by a clamping ring; the wide tile and the narrow tile are fixed to the wide tile bracket and the narrow tile bracket respectively, the wide tile bracket and the narrow tile bracket are in contact with the bottom plate limit plate through the designed slider, and the drum tile bracket and the drum tile wedge block are in contact with the guide rail slider; the designed slider is composed of a socket, a bearing shaft, an elastic retaining ring and a deep groove ball bearing, and the socket is divided into two parts, which are fixed to the bottom end of the narrow tile bracket and the wide tile bracket by connecting bolts. 2. The stepped tire direct pressure vulcanization inner mold according to claim 1 is characterized in that the upper side surface of the narrow tile wedge block is fixedly connected to the end cover and is fixedly connected to the piston inner rod through a clamp ring and connecting bolts. 3. The stepped tire direct pressure vulcanization inner mold according to claim 1 is characterized in that: the guide rail is fixedly connected to the narrow tile wedge block and the wide tile wedge block by connecting bolts, and there is a limit plate at the end of the guide rail on the narrow tile wedge block to limit the movement of the slider on the guide rail. By cooperating with the piston outer rod, the overall axial movement of the narrow tile mechanism is realized to make room for the internal space for the contraction of the wide tile.