CN204471668U - Separated type spring air-casing - Google Patents

Abstract

The utility model belongs to the technical field of tire vulcanization, in particular to a split-type spring air sleeve used for exhausting the cavity of a tire vulcanization mold. The utility model includes a valve casing and a mandrel, on which a spring part is sheathed, and one end of the mandrel is coaxially arranged with a conical truncated part, and the cavity of the valve casing is in the shape of a two-stage stepped hole, and its relatively large-diameter end is provided with an inner inversion. Angle, the conical surface of the above-mentioned truncated cone part and the inner chamfer can form a surface-fitting sealing fit in the axial direction; the other end of the shaft body that is relatively fixed to the truncated cone part is provided with a stop part, and the stop part and the valve The small aperture end of the shell cavity forms a one-way notch stop fit; the mandrel is provided with a notch at the top of the notch to form a multi-lobed structure of the notch, and the notch extends axially along the mandrel to its axis. Body; the hole end of the cavity of the valve housing that matches the spigot portion and the shoulder of the inner hole are all provided with a chamfering structure that is convenient for the mandrel to be pulled out of the cavity of the valve housing. Its maintenance and replacement are fast and convenient, and the maintenance cost can also be effectively reduced.

Description

Split spring air sleeve

technical field

The utility model belongs to the technical field of tire vulcanization, in particular to a split-type spring air sleeve used for exhausting the cavity of a tire vulcanization mold.

Background technique

To form a molded tire from the green tire manufactured in the state of raw rubber, it needs to be vulcanized at high temperature and high pressure by a vulcanizer. The vulcanizing machine usually includes a mold with a cavity, and a bladder is arranged in the center of the cavity of the mold. When in use, an external tire loading and unloading device is used to center the green tire on the bladder to achieve its heating and pressing effect. Since the green tire is placed in the mold cavity, there is initially a gap between the outer wall of the green tire and the wall of the mold cavity. After the green tire is heated and expanded, how to remove the air in the gap without affecting the molding effect of the green tire, so as to ensure the smooth expansion of the green tire to the wall of the cavity for final molding becomes a problem.

For overcoming above-mentioned situation, the appearance of spring air sleeve becomes inevitable. The structure of the spring air sleeve usually includes a sleeve-shaped valve housing as the outer shell, and a columnar mandrel is coaxially sleeved in the valve housing, and a spring is sleeved on the mandrel. The bottom of the mandrel and one end of the valve casing form a one-way gear fit, and the top end of the mandrel and the other end of the valve housing have a sealing mating surface that can form a one-way gear fit. The limit of the above two one-way gear fits The directions are arranged opposite to each other. In actual application, use the through mold opened on the mold to connect the cavity and the exhaust hole of the external exhaust equipment, insert the spring air sleeve into the exhaust hole with interference, and make the end of the sealing mating surface of the valve housing and the mold The cavity wall is set flush. During the vulcanization process, the green tire is heated and expanded, and the gap between the green tire and the cavity wall of the mold is gradually reduced. Due to the action of the spring, the sealing mating surface of the mandrel and the valve casing is in an open state, so the air in the above-mentioned gap overflows along the gap of the aforementioned sealing mating surface, and is removed by the external exhaust device. Until the tire is completely vulcanized, there is no gap between the tire and the cavity wall of the mold. At this time, the sealing mating surface of the mandrel and the valve housing is squeezed by the tire, so that the above sealing mating surface is completely fitted and sealed. After the tire is vulcanized and taken out, under the action of elasticity, the mandrel is reset, and a new round of vulcanization operation can be prepared.

When the above-mentioned spring air sleeve is used in practice, the existing problems are as follows: First, as a pneumatic part, the inner spring of the spring air sleeve is often stuck and damaged due to factors such as rubber penetration or elastic fatigue. Vent holes, that is, the number of installations of spring air sleeves is very large, which leads to a very high cost of replacing them one by one, and the maintenance and installation are also extremely cumbersome. Secondly, because the vulcanization process is bound to be accompanied by high temperature, as a metal spring, it is prone to elastic failure after being affected by high temperature, resulting in a sharp decrease in the service life of the spring, which has an adverse effect on the actual use effect of the spring air sleeve. How to find a spring air jacket with a simple structure and a convenient replacement function, so as to reduce its actual replacement cost and improve the market competitiveness of vulcanization enterprises, is a technical problem to be solved urgently in this field in recent years.

Contents of the invention

The purpose of the utility model is to provide a split-type spring air jacket with simple structure, which is fast and convenient to maintain and replace, and the maintenance cost can be effectively reduced, so as to meet the low-cost and high-efficiency production requirements of vulcanization enterprises.

In order to achieve the above object, the utility model adopts the following technical solutions:

Split-type spring air sleeve, including a cylindrical valve housing and a mandrel coaxially sleeved in the cavity of the valve housing. One end of the mandrel is coaxially arranged with a truncated cone, and the small-diameter end of the truncated cone forms a fixed end that is affixed to the shaft body of the mandrel. The cavity of the valve housing is a two-stage stepped hole shape and its The inner chamfer is set relative to the large-diameter end, and the conical surface of the above-mentioned truncated cone part and the inner chamfer can form a sealing fit in the axial direction; The mouth part and the small aperture end of the valve housing cavity form a one-way stop gear fit, the gear direction of the mouth part is opposite to the sealing and closing direction of the frustum part; the spring part is a compression spring , the two ends of the spring part form abutting fit with the small diameter end of the truncated cone part and the shoulder of the cavity of the valve housing respectively; the mandrel is provided with more than one notch on the top of the mouth part along its axial direction. Groove, the notch groove runs through the entire shaft body in the radial direction of the mandrel to form a multi-lobed structure of the mouth part, and the notch groove extends axially along the mandrel to the shaft body; The end of the matching hole and the shoulder of the inner hole are provided with a chamfering structure which is convenient for the mandrel to be pulled out of the cavity of the valve housing.

The shape of the shaft body is in the shape of a straight cylinder, the shape of the spigot part is a cylindrical structure with a frustum-shaped top, and the bottom end of the spigot part opposite to the top end is arranged coaxially with the corresponding end of the shaft body; The notched groove is a sunken groove structure, the groove bottom is perpendicular to the axis of the mandrel, and the groove walls on both sides are symmetrically arranged along the axis of the mandrel.

When the conical surface of the frustum of the mandrel forms a sealing fit with the inner chamfer of the large-diameter end of the valve housing cavity, the distance between the seam and the small-diameter end surface of the valve housing cavity is 0.15mm.

The large-diameter end face on the truncated cone part for contacting the tire surface is arranged in conformity with the contour of the mold cavity where it is installed.

The material used for the spring part is a high temperature resistant material with a heat resistance temperature higher than 175°C.

The beneficial effects of the utility model are:

1) On the one hand, continue to use the traditional cylindrical valve casing with the mandrel structure with spring part, so that through the reciprocating movement of the mandrel along the valve casing, the inner diameter of the mandrel to the large-aperture end surface of the cylindrical valve casing is realized. The opening and closing sealing purpose of the chamfer. On the other hand, compared with the traditional air sleeve structure, a notch groove is opened at the mandrel, and a chamfer structure is provided on the matching part on the valve housing, so as to realize the quick and easy assembly of the mandrel based on the valve housing. Axial plugging purpose. In actual use, once the spring part, which is an extremely fragile part, is damaged or stuck, directly press the petal-shaped stop part in the radial direction to shrink this part of the mandrel to reduce its diameter, so that it stops. The mouth can be axially withdrawn from the valve housing along the above chamfer structure of the valve housing, and then replace the new mandrel or spring part and insert it back in the same way, so as to achieve the purpose of rapid replacement and maintenance. It is purely for the replacement of the mandrel, and the operation is simple, quick and efficient; the split structure can effectively reduce the cost of maintenance and replacement, which is obviously very suitable for the low-cost and high-efficiency production needs of vulcanization enterprises.

2) The actual shape and number of notch grooves can be varied, or two or more straight grooves arranged in parallel or staggered can be used to form a three-lobed or even multi-lobed structure at the end of the mandrel. Or as described in the present invention, through a single arrangement of the sinker structure, that is, the mouth part of the mandrel presents a two-lobed open shaft structure. The structure of the spigot portion is either a square block structure, or a truncated conical structure described in the utility model, and only needs to realize its spigot fit with the valve housing. In this way, the spigot portion and the valve housing form a spigot stop structure under normal conditions, and due to the existence of the notch groove, when the two-petal type spigot portion is radially pressed, the caliber of the spigot portion can be smoothly realized. The reduction function is used to achieve the effect of smoothly passing through the cavity of the valve housing, and its operation is extremely reliable and convenient.

3) The large-diameter end face of the truncated cone is used as the direct contact surface with the surface of the expanded tire after pressurization and heating. Obviously, depending on the conformity between its outer contour and the contour of the mold cavity where it is installed, it can be more Ensure the tire surface molding effect at this place well, so as to avoid the problem of tire molding defects caused by too many mold cavities protruding abruptly from the frustum.

4) Most of the spring parts in the industry have extremely low service life at present, and are often used as wearing parts. In fact, using the high-temperature-resistant material above 175°C described in the present invention is more conducive to increasing the strength of the spring portion during use, and its service life can be significantly improved. By adopting the above materials, the service life of the spring part, which is originally a wearing part, can be greatly extended, and the corresponding mandrel pull-out and maintenance cycle will be correspondingly increased, and the maintenance and replacement cost will be further reduced indirectly, which is beneficial to vulcanization enterprises The actual economic benefits can have a favorable impact.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the sealing mating surface formed by the frustum of the utility model and the inner chamfer of the valve housing in an open state;

Fig. 2 is a structural schematic diagram of the sealing mating surface formed by the frustum of the utility model and the inner chamfer of the valve housing in a closed state;

Fig. 3 is the schematic cross-sectional view of the structure of the mandrel;

FIG. 4 is a top view of FIG. 3 .

The corresponding relationship between each label in the figure and the name of the specific parts of the utility model is as follows:

10-valve housing 11-inner chamfer

20-mandrel 21-conical truncated part 22-shaft body 23-sealing part 23a-notch groove

30-spring part

Detailed ways

For ease of understanding, here in conjunction with Fig. 1-4 concrete structure of the present utility model and work flow are described as follows:

The specific structure of the utility model is shown in FIGS. 1-4 , which includes a valve casing 10 with a straight cylindrical shape, and a mandrel 20 is arranged inside the valve casing 10 . The cavity of the valve housing 10 is a two-stage stepped hole structure. One end of the shaft body 22 of the mandrel 20 is coaxially arranged with a frustum 21 , and the other end of the shaft body 22 is arranged with a notch portion 23 of a groove 23a to be notched. The conical inclined surface of the truncated cone portion 21 and the inner chamfer 11 at the large-diameter end of the cavity of the valve housing 10 form a sealing surface fit. The spigot part 23 forms a unidirectional spigot fit with the small-diameter end face of the cavity of the valve housing 10 . The above-mentioned frustum portion 21 , shaft body 22 and spigot portion 23 are sequentially arranged along the axis to form a three-stage stepped shaft structure in which both ends of the mandrel 20 have a thicker diameter and a middle section has a thinner diameter. In order to facilitate the rapid insertion and maintenance of the mandrel 20 based on the valve casing 10 , chamfering structures are arranged at the small diameter end of the valve casing 10 and the shoulder of the cavity of the valve casing 10 .

In fact, when the notch groove 23a is actually provided, the groove portion has also been considered to be provided on the valve casing 10, so as to rely on the outward expansion of the valve casing 10 to ensure that the mandrel 20 can be pulled out along the valve casing 10. However, in actual use, it is found that since the vent hole on the mold and the outer wall of the valve housing 10 are usually an interference fixed fit, how to ensure that the valve housing 10 has enough room for movement when the mandrel 20 needs to be pulled out to make the valve The outward expansion action of the shell 10 becomes a difficult problem. Although a special vent structure can be pre-designed to ensure the above-mentioned action margin, it will indirectly increase its actual design and production costs, and the stability of the cooperation between the vent hole and the valve housing 10 may also be due to the gap between the two. There are many problems caused by the matching gap. The utility model adopts the groove petal structure of the stopper part 23, the valve housing 10 itself still presents a complete straight cylindrical structure, and its own working stiffness and stability are not affected at all, and the self-structure of the vent hole only needs to meet the requirements of the valve housing. The stable interference fit between 10 is the standard, and the design is extremely simple. During replacement and maintenance, only through the deformation of the mandrel 20 itself and the pre-arranged chamfering structure at the valve housing 10, the quick disassembly and assembly requirements can be realized, the realization cost is lower, the working performance is more reliable, and the disassembly and assembly efficiency is improved. It is also evident that exact guarantees can be obtained.

When the utility model is actually used, on the one hand, the high temperature resistance requirement in the vulcanization process is realized through the high temperature resistant material of the spring part 30 itself, so as to improve its actual service life. On the other hand, when the spring part 30 or even the mandrel 20 is stuck and damaged, the two-lobed notch part 23 is directly pressed, and under the effect of the notch groove 23a at the notch part 23, the notch part 23 The phenomenon of radial shrinkage can be produced, and combined with the chamfered structure that facilitates the passage of the mouth part 23, the entire mandrel 20 can slide out of the cavity of the valve housing 10 through the small diameter end of the valve housing 10 in the axial direction. Ultimately, the purpose of quickly taking out the mandrel 20 and the spring part 30 is achieved. Then according to the situation, replace the new mandrel 20 or spring part 30 and get final product.

The utility model is convenient to assemble and disassemble, has high efficiency, and works reliably and stably. While ensuring the service life of the spring part 30, it can reduce its actual maintenance and replacement costs. Obviously, it is very in line with the low-cost and high-efficiency production needs of vulcanization enterprises, and its market prospects broad.

Claims (5)

1. Separated type spring air-casing, comprise the valve casing (10) of tubular and coaxial sleeve and be connected to mandrel (20) in valve casing (10) vestibule, described mandrel (20) is arranged with for making mandrel (20) produce the spring (30) of axial reciprocating linearly operating along valve casing (10) vestibule, the coaxially arranged prismoid section in one end (21) of mandrel (20), the smaller diameter end of prismoid section (21) forms the fixed connecting end affixed with the axle body (22) of mandrel (20), valve casing (10) vestibule is that the ladder of two-period form is poroid and its relative large aperture end arranges interior chamfering (11), what the taper surface of above-mentioned prismoid section (21) and this interior chamfering (11) can form that face fits in the axial direction is sealed and matched, the other end of the relatively affixed prismoid section (21) of axle body (22) arranges seam portion (23), described seam portion (23) and the small-bore end of valve casing (10) vestibule form unidirectional seam gear and coordinate, and the gear direction of seam portion (23) and the seal closure direction of prismoid section (21) are oppositely arranged, spring (30) is Compress Spring, and the two ends of spring (30) form against coordinating with the smaller diameter end of prismoid section (21) and the shoulder place, hole of valve casing (10) vestibule respectively, it is characterized in that: described mandrel (20) is provided with more than one gap slot (23a) on seam portion (23) top along its axial indent, gap slot (23a) runs through whole axis body to form the multi-clove type structure in seam portion (23) along mandrel (20) radial direction, and this gap slot (23a) axially extends to its axle body (22) place along mandrel (20), described valve casing (10) vestibule coordinate nose end and its endoporus shoulder place all to offer to be convenient to seam portion (23) chamfering structure that mandrel (20) plug goes out valve casing vestibule.

2. Separated type spring air-casing according to claim 1, it is characterized in that: described axle body (22) profile is straight circular cylinder type, seam portion (23) profile constructs in the cylindrical shape possessing frustum top, the bottom affixed layout coaxial with axle body (22) respective end on its top relative of seam portion (23); Described gap slot (23a) is deep gouge structure, and its bottom land vertical spindle (20) axis and its both sides cell wall are arranged along mandrel (20) axis for axis symmetry.

3. Separated type spring air-casing according to claim 1 and 2, it is characterized in that: the interior chamfering (11) of prismoid section (21) conical surface of described mandrel (20) and the large aperture end of valve casing (10) vestibule forms when being sealed and matched, seam portion (23) are 0.15mm with the small-caliber end end distance a of valve casing (20) vestibule.

4. Separated type spring air-casing according to claim 1 and 2, is characterized in that: coincideing for the larger diameter end end face and its installation place mold cavity appearance profile contacting surface of tyre in described prismoid section (21) is arranged.

5. Separated type spring air-casing according to claim 1 and 2, is characterized in that: described spring (30) material used is heat resisting temperature higher than the exotic material of 175 DEG C.