CN116021819B - Tyre building machine adopting mechanical drum - Google Patents

Abstract

The invention relates to the technical field of tire building, in particular to a tire building machine adopting a mechanical drum, which comprises: and a spindle assembly disposed at an outer periphery of the spindle assembly and rotating around a circumferential direction by a driving of the spindle assembly, the forming drum including: the barrel that is overlapped in main shaft subassembly periphery and is locked with main shaft subassembly circumference, around the barrel periphery, and the multiple sets of anti-package subassembly of mutual alignment in axial, anti-package subassembly is thereby along the axial removal of barrel with support position and retracted position under the drive of first drive assembly to anti-package subassembly is carried out the anti-package of side wall in the in-process from retracted position to support position, anti-package subassembly includes: the support plate moves outwards along the radial direction of the cylinder body in the process of the turn-up assembly from the retracted position to the supporting position, a support platform is provided for the tire sidewall, and an included angle between the support plate and the horizontal plane is 10-20 degrees in the supporting position. The invention optimally designs the elevation angle of the supporting position of the supporting plate, and solves the problem of rebound of the side wall.

Description

Tyre building machine adopting mechanical drum

Technical Field

The invention relates to the technical field of tire building, in particular to a tire building machine adopting a mechanical drum.

Background

The existing drum turn-up structure is generally divided into two forms: a capsule drum turn-up capsule structure and a mechanical drum turn-up rod structure. The former turn-up height is uniform, but the turn-up speed is low, the pressure of the turn-up capsule on the side wall is small, the side wall is poor in adhesion with the carcass and the triangular glue, and the quality problem is easily caused by void; meanwhile, the anti-wrapping press roller is easy to touch the capsule when extending into the space between the side wall and the capsule to carry out anti-wrapping press on the side wall, so that the service life of the capsule is greatly influenced, and the manufacturing cost of the tire is increased. The latter adopts the metal vaulting pole to realize the side wall and turns up the package process, turns up the pole and props up the highest point position and locate in tire shoulder department, props up highly too high, makes the compression side wall position size warp greatly, leads to the side wall limit portion to form circumference wavy after the embryo shaping, and is great to the influence of tire dynamic balance homogeneity.

Chinese patent application (CN 113681957a, publication No. 2021.11.23) discloses a machine drum suspension-pulling anti-wrapping forming structure, which comprises a main shaft assembly and a rear pressing carriage, wherein the rear pressing carriage is opposite to the main shaft assembly, the machine drum suspension-pulling anti-wrapping forming structure further comprises a lock ring assembly and anti-wrapping assemblies arranged on the main shaft assembly, the number of the anti-wrapping assemblies is two, the two anti-wrapping assemblies are symmetrically arranged at two sides of the lock ring assembly, and the anti-wrapping assemblies comprise: the plurality of the anti-wrapping structures are arranged at intervals around the circumference of the spindle assembly and are provided with supporting positions and withdrawing positions; the support plates are in one-to-one correspondence with the plurality of anti-wrapping structures and are arranged on the corresponding anti-wrapping structures; the first driving assembly is arranged on the main shaft assembly and is in driving connection with the plurality of anti-packet structures; in the process that the anti-package structure moves from the supporting position to the withdrawing position, the suspension arm of the rear pressing vehicle can extend into the space between the side wall and the anti-package structure and drive the side wall to move along the direction away from the anti-package structure. In this patent, when the backup pad is in the supporting position, the side wall receives the support of backup pad and is in by tensile state, but unvulcanized rubber has certain elasticity, and when the backup pad was reset from the supporting position and is got back to the retracted position, the side wall part that is not rolled by the turn-up structure can rebound thereupon, causes the side wall to roll over the phenomenon, and the back compression roller of back press car will not stretch into between the side wall after the resilience and the turn-up structure this moment to can't roll over the side wall of resilience.

Disclosure of Invention

In order to solve the technical problems of the Chinese patent application CN 113681957A, the invention aims to provide a tire building machine adopting a mechanical drum, which optimally designs the elevation angle of the supporting position of a supporting plate, so that the supporting plate forms pretension to the sidewall, and the pretension enables the sidewall part supported by the supporting plate to generate plastic deformation, thereby solving the problem of rebound of the sidewall.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

a tire building machine employing a mechanical drum, comprising:

a main shaft assembly, a main shaft assembly and a main shaft assembly,

a forming drum disposed at an outer periphery of the spindle assembly and rotated around a circumferential direction by a drive of the spindle assembly, the forming drum comprising:

a cylinder body sleeved on the periphery of the main shaft assembly and circumferentially locked with the main shaft assembly,

a plurality of turn-up assemblies surrounding the outer circumference of the cylinder and axially aligned with each other, the turn-up assemblies being moved in the axial direction of the cylinder by a first driving assembly to have a supporting position and a retracted position, and turn-up the sidewalls during the course of moving from the retracted position to the supporting position,

the anti-packet assembly includes: a support plate which moves outwards along the radial direction of the cylinder body in the process of the turnup assembly from the retracted position to the support position to provide a support platform for the sidewall,

At the supporting position, the included angle between the supporting plate and the horizontal plane is 10-20 degrees.

Preferably, in the support position, the support plate has a length exceeding the sidewall edge. The end position of the supporting plate is covered on the side edge of the tire, so that the rebound of the side edge of the tire due to no pretension is avoided.

Preferably, the end of the supporting plate, which is close to the side wall, is provided with a turn-up pinch roller, the turn-up pinch roller rolls the side wall from a retracted position to a supporting position in the turn-up assembly, turn-up is achieved, and the upper end face of the supporting plate is not lower than the upper end point of the turn-up pinch roller in the supporting position. The starting position of the pre-stretching sidewall is from the highest point of the turnup wheel, so that the sidewall is prevented from bending at the highest point of the turnup wheel.

Preferably, the unpacking assembly further comprises: the connecting rod seat is connected with the output end of the first driving assembly, so that the connecting rod seat can axially move on the cylinder body, the lower end of the connecting rod seat is respectively hinged with the anti-package main rod and the anti-package auxiliary rod, the supporting plate is hinged to the upper ends of the anti-package main rod and the anti-package auxiliary rod, along with the axial movement of the connecting rod seat, the anti-package main rod and the anti-package auxiliary rod correspondingly swing, and further the supporting plate is driven to prop up or fall in the radial direction, and in a supporting position, the upper end of the anti-package auxiliary rod is higher than the anti-package main rod, so that an included angle is formed between the supporting plate and a horizontal plane.

Preferably, the turnup main lever and the turnup auxiliary lever are arranged side by side, and the turnup auxiliary lever is longer than the turnup main lever. The invention realizes the elevation angle of the supporting plate through the length difference of the turn-up auxiliary rod and the turn-up rod.

Preferably, the anti-package assembly further comprises a limiting connecting rod, one end of the limiting connecting rod is hinged with the anti-package auxiliary rod, the other end of the limiting connecting rod is provided with a second driving assembly, and the second driving assembly drives the other end of the limiting connecting rod to axially move, so that the limiting connecting rod limits the position of the supporting plate in the process from the retracted position to the supporting position of the anti-package assembly. The invention can drive the limit connecting rod to move through the axial movement of the second driving component, realize that the anti-wrapping wheel is close to or far away from the side wall, provide the pressure between the anti-wrapping wheel and the side wall, and simultaneously ensure that the supporting plate cannot move in the supporting position.

Preferably, the first driving assembly includes: the annular driving sleeve is sleeved on the periphery of the cylinder and can axially move on the cylinder, a plurality of fixing positions are arranged on the periphery of the annular driving sleeve, and the connecting rod seat is fixedly arranged in the corresponding fixing positions so as to axially move on the cylinder along with the annular driving sleeve. The invention can drive the connecting rod seat to reciprocate through the movement of the annular driving sleeve on the cylinder body, so that the anti-bag assembly moves in the supporting position and the retraction position.

Preferably, the first driving assembly further comprises: the inner end cover is fixedly connected with the annular driving sleeve and extends around the circumference of the cylinder body, the outer end cover is arranged at the outer end of the circumference of the inner end cover and can axially move on the outer circumference of the cylinder body, the first cylinder barrel is fixedly arranged between the inner end cover and the outer end cover and surrounds an annular area formed between the outer circumference of the cylinder body and the cylinder body, and the first annular piston is positioned in the annular area and fixedly arranged on the cylinder body, the radial outer end of the first annular piston is connected with the inner wall of the first cylinder barrel in a sealing way, so that chambers are respectively formed at two sides of the first annular piston, and the inner end cover, the first cylinder barrel and the outer end cover are controlled to axially move on the cylinder body by changing the air pressure in the chambers.

Preferably, the two sides of the first annular piston are respectively provided with air inlet and outlet holes communicated with the corresponding chambers, the inside of the cylinder is provided with a gas channel communicated with the corresponding air inlet and outlet holes, and the end part of the gas channel extends to a flange plate arranged at the end part of the cylinder.

Preferably, the second driving assembly includes: the second cylinder barrel surrounds the periphery at first actuating assembly to with first actuating assembly fixed connection, set up between first actuating assembly and second cylinder barrel and along axial displacement's second annular piston, the second annular piston is kept away from the end of side wall and is provided with the piston chamber, is provided with the air inlet and outlet that the gas business turn over in the piston chamber, the fixed driving ring that is provided with of that second annular piston is towards the end of side wall, the driving ring is provided with the connector of arranging around circumference towards the side wall, is provided with the articulated shaft in the connector, the other end of spacing connecting rod articulated on the articulated shaft.

By adopting the technical scheme, the elevation angle of the supporting position of the supporting plate is optimally designed, so that the supporting plate forms pretension to the side wall, and the pretension enables the side wall part supported by the supporting plate to generate plastic deformation, thereby solving the problem of rebound of the side wall. Further, the starting position of the pre-stretching sidewall is from the highest point of the turnup wheel, so that the sidewall is prevented from bending at the highest point of the turnup wheel; the end position of the supporting plate is covered to the side edge, so that the side edge is prevented from rebounding due to the fact that the side edge is not pretensioned. In addition, the invention also discloses an implementation structure of the first driving mechanism and the second driving mechanism, which is convenient to control and implement.

Drawings

Fig. 1 is a perspective view of a tire building apparatus of a tire building machine.

Fig. 2 is an exploded view of a tire building apparatus of a tire building machine, including a spindle assembly, a first building drum, and a second building drum after disassembly.

Fig. 3 is an exploded view of the spindle assembly.

Fig. 4 is a schematic view of a first building drum.

Fig. 5 is a schematic view of the lock ring assembly and the second drive assembly on the first building drum after being hidden, i.e. only the cylinder, the turn-up assembly and the first drive assembly are shown.

Fig. 6 is an exploded view of the cartridge, the turn-up assembly and the first drive assembly.

Fig. 7 is a perspective view of the first forming drum cut away in a longitudinal plane passing through the cylinder centerline.

Fig. 8 is a cross-sectional view of the cartridge and shows in the figure the gas channels contained inside the cartridge.

Fig. 9 is a schematic view of the first forming drum with the second drive assembly exploded.

Fig. 10 is a perspective view of the first forming drum cut away in a longitudinal plane passing through the centerline of the cylinder.

Fig. 11 is an exploded view of the lock collar assembly.

FIG. 12 is a schematic view of a lock collar assembly in longitudinal section.

Fig. 13 is a schematic view of a lock collar piston and lock collar block.

FIG. 14 is a schematic view of the support plate in the turnup assembly in a retracted position during tire building.

FIG. 15 is a schematic view of the support plate in the turnup assembly in a support position during tire building.

Detailed Description

The following describes the embodiments of the present invention in detail with reference to the drawings.

The tyre forming machine is a special tyre producing equipment for forming tyre blank by combining semi-finished parts (such as tread, sidewall, crown, tyre body, tyre bead, etc.) according to technological requirements. The tire forming machine comprises a tire forming device arranged at the front end, a plurality of conveying devices arranged at the rear end and used for conveying different semi-finished products, and a rear pressing device arranged above the tire forming device, wherein the rear pressing device is mainly used for further rolling the tire side when the tire forming device performs the reverse packing action of the tire side. The structure of the rear vehicle pressing device is shown in China patent application CN113681957A.

Fig. 1 shows a schematic view of a tire building apparatus in this embodiment, which includes a spindle assembly 10 disposed in the center of the apparatus and having an elongated cylindrical shape with an axis extending in the horizontal direction, and two first and second building drums 20 and 20 disposed in a left-right distribution on the outer periphery of the spindle assembly 10 and both capable of rotating around the circumferential direction in synchronization with the spindle assembly 10, in this embodiment, both the first and second building drums 20 and 20 are mechanical drums, the first and second building drums 20 and 20 are cylindrical in shape, and the first and second building drums 20 and 20 are left-right symmetrical, respectively, for building one side of a tire blank.

When the tire blank is formed, the head ends of the multiple layers of rubber materials forming the tire blank are respectively lapped on a tire forming device through respective conveying devices, specifically, the right end of each layer of rubber material is connected to the first forming drum 20, and the left end of each layer of rubber material is connected to the second forming drum; the main shaft assembly 10 drives the first forming drum 20 and the second forming drum to rotate at a high speed, so that the rubber material is rapidly wound on the outer surfaces of the first forming drum 20 and the second forming drum; after winding, the rubber material is annular, the left end and the right end of the rubber material transversely span between the first forming drum 20 and the second forming drum, and a closed cavity is formed in the rubber material; the spindle assembly 10 then inflates the region within the rubber material, thereby causing the rubber material to expand radially outwardly, initially forming a tire bead; meanwhile, the first molding drum 20 and the second molding drum turn up the positions of the sidewalls close to the radial inner side of the tire blank, so that the sidewalls are attached to the outer surface of the tire body after bypassing the tire bead and extend outwards again in the radial direction, after the sidewalls are initially turned up, the non-turned up sidewalls are rolled by the post-rolling device until the sidewalls are completely attached to the tire body, and the tire molding process is completed.

Since the structures of the first forming drum 20 and the second forming drum are bilaterally symmetrical, the specific structures of the two forming drums are hereinafter illustrated by way of example with the first forming drum 20, and the structure of the second forming drum will not be described again.

As shown in fig. 2, in order to achieve that the spindle assembly 10 drives the first forming drum 20 and the second forming drum to rotate around the circumferential direction, the following structure is adopted: the spindle assembly 10 includes a long rod-shaped spindle 11 disposed in a transverse direction, the outer surface of the spindle 11 being a smooth, flat cylindrical surface, and a first protrusion 113 and a second protrusion 114 being provided on the cylindrical surface, wherein the first protrusion 113 is relatively close to the right end of the spindle 11, the second protrusion 114 is relatively close to the left end of the spindle 11, and both the first protrusion 113 and the second protrusion 114 protrude outward in a radial direction of the spindle 11, thereby forming a protrusion on the outer surface of the spindle 11. Corresponding to the protrusions, the first forming drum 20 and the second forming drum are respectively provided with a first connection hole 211 and a second connection hole (view reason is not shown, and is set with reference to the first connection hole 211), the first connection hole 211 is matched with the first protrusion 113, the second connection hole is matched with the second protrusion 114, more precisely, the radial outer end of the first protrusion 113 is inserted into the first connection hole 211, and the radial outer end of the second protrusion 114 is inserted into the second connection hole, so that when the external driving source drives the main shaft 11 to rotate, the first protrusion 113 and the second protrusion 114 respectively drive the first forming drum 20 and the second forming drum to rotate circumferentially.

It should be noted that the number of the first protruding blocks 113 and the second protruding blocks 114 may vary, for example, in this embodiment, two first protruding blocks 113 and two second protruding blocks 114 are respectively provided (two corresponding first through grooves 111 and two second through grooves 112) and are disposed on the outer surface of the main shaft 11 in a radially opposite manner, so that not only the connection strength between the main shaft 11 and the forming drum can be improved, but also the centrifugal force can be balanced during the rotation of the forming drum, and smooth rotation is ensured.

Furthermore, it is noted that tires of different gauges often have different widths, which during tire building is mainly reflected by different distances between the left and right beads, i.e. different axial spacing between the first building drum 20 and the second building drum for the tire building device. It is therefore also necessary to adjust the axial distance of the first forming drum 20 and the second forming drum on the spindle 11 when producing tyres of different gauges. For this, as shown in fig. 3, the inside of the main shaft 11 is provided in a hollow structure, a first through groove 111 and a second through groove 112 communicating with the inner cavity are provided on the outer surface of the main shaft 11, the first through groove 111 is relatively close to the right side of the main shaft 11, the second through groove is relatively close to the left side of the main shaft 11, and both the first through groove 111 and the second through groove 112 extend along the axis of the main shaft 11, thereby forming a long strip shape. The first protrusion 113 is slidably disposed in the first through groove 111, the second protrusion 114 is slidably disposed in the second through groove 112, and for driving the first protrusion 113 and the second protrusion 114 to axially move in the first through groove 111 and the second through groove 112, respectively, a screw rod 12 is concentrically disposed in the main shaft 11, both ends of the screw rod 12 extend to positions where the first through groove 111 and the second through groove 112 are disposed, respectively, and threads on left and right sides of the screw rod 12 are rotated in opposite directions, and a first screw 13 and a second screw 14 are disposed on right and left peripheries of the screw rod 12 by screw connection rotation, respectively, wherein the first screw 13 is fixedly connected with the first protrusion 113, the second nut 14 is fixedly connected with the second bump 114, when the screw rod 12 rotates, the first nut 13 drives the first bump 113 to axially move in the first through groove 111, the second nut 14 drives the second bump 114 to axially move in the second through groove 112, and because the threads on the left side and the right side of the screw rod 12 rotate oppositely, the first nut 13 and the second nut 14 are mutually close to each other at the same speed or are mutually far away from each other at the same speed, and further the first bump 113 and the second bump 114 are mutually close to or far away from each other, so that the first forming drum 20 and the second forming drum correspondingly axially move on the main shaft 11, and the interval between the first forming drum 20 and the second forming drum is adjusted.

When the spindle assembly 10 is used as follows, when the axial distance between the left bead and the right bead needs to be enlarged, the screw rod 12 is driven to rotate only by a driving element such as a motor, so that the first screw 13 and the second screw 14 move towards the outer end of the spindle 11 along the axial direction of the screw rod 12 in opposite directions, and further the first lug 113 and the second lug 114 move towards the outer end in the axial direction in the first through groove 111 and the second through groove 112 respectively, and finally the axial distance between the first forming drum 20 and the second forming drum is enlarged. Conversely, when the drive element drives the screw 12 in reverse rotation, the axial distance between the first forming drum 20 and the second forming drum is reduced.

As one of the modes of the fixed connection between the nut and the bump, as shown in fig. 3, an annular fixing sleeve 15 is sleeved on the outer side of the first nut 13 in the circumferential direction, the right end surface of the fixing sleeve 15 is fixedly connected with the flange surface of the right end of the first nut 13 through bolts, a plurality of mounting grooves 151 are uniformly formed in the periphery of the fixing sleeve 15, threaded holes are formed in each mounting groove 151, radial extending through holes for the bolts to pass through are formed in the first bump 113, and thus the first bump 113 can be fixedly arranged in one of the mounting grooves 151 through the bolts, so that the relative fixation between the first bump 113 and the first nut 13 is realized. It is ensured that the first screw 13 and the first projection 113 can be axially moved along the guide of the first through groove 111 when the screw 12 is rotated. The connection between the second nut 14 and the second bump 114 refers to the above structure, and will not be described herein.

As described above, the tire building process is also required to perform air blowing, and for this purpose, as shown in fig. 3, the outer surface of the middle part of the spindle 11 is provided with air blowing holes 116, in this embodiment, two air blowing holes 116 (only the air blowing holes facing the observer are shown in fig. 3 for viewing angle reasons) are provided at diametrically opposite ends on the outer surface of the spindle 11 to achieve rapid and uniform inflation of the inside of the tire. The right end of the main shaft 11 is provided with a blowing flange 117 for connecting an external air source, the blowing hole 116 is communicated with the blowing flange 117 through an air passage (not shown) arranged in the main shaft 11, when the tire blank is required to be inflated, an external air source (such as an air storage tank) supplies air to the blowing flange 117, so that compressed air enters the air passage and finally is blown out from the blowing hole 116, and each layer of rubber material forming the tire blank expands radially outwards to realize preliminary molding of the tire blank.

After the above-described structure of the spindle 11 is clarified, the axial direction of the spindle 11 is hereinafter referred to as the axial direction, and the middle portion near the axial direction of the spindle 11 is referred to as the inner end, whereas the both ends near the axial direction of the spindle 11 are referred to as the outer ends. The radial direction of the main shaft 11 is defined as the radial direction, and the radial inner end (sometimes referred to as the lower end) is defined as the axis near the main shaft 11, whereas the radial outer end (sometimes referred to as the upper end) is defined as the axis far from the main shaft 11. With the circumferential direction around the spindle 11 as the circumferential direction.

Fig. 4 shows a schematic view of the first forming drum 20, the first forming drum 20 includes a cylinder 21 disposed at the center of the first forming drum 20 and disposed laterally, the cylinder 21 has a cylindrical shape with a hollow interior and open left and right ends, an inner surface of the cylinder 21 is disposed on an outer surface of the main shaft 11 in an axially sliding manner, more precisely, the inner surface of the cylinder 21 is a cylindrical surface corresponding to a diameter of the outer surface of the main shaft 11, and thus the cylinder 21 can axially translate on the main shaft 11. The first connecting hole 211 is located on the cylinder 21 (see fig. 6), so that when the first lug 113 in the spindle assembly 10 moves axially, the cylinder 21 is driven to move axially on the spindle 11, and thus the first forming drum 20 moves axially on the spindle 11 as a whole.

As shown in fig. 4, an inner end (represented as a left end in fig. 4) of the cylinder 21 is fixedly provided with an annular lock ring assembly 22, and the lock ring assembly 22 is used for fixing the positions of beads during tire building, thereby defining the width of the green tire.

As shown in fig. 4, a plurality of sets (only two sets are shown as an example in fig. 4, and actually 30 to 40 sets) of turn-up members 23 are uniformly arranged around the circumference of the middle portion of the cylinder 21 at intervals, and in the axial direction, the turn-up members 23 are aligned with each other, that is, two axial ends of the turn-up member 23 are located on one circumference. The turnup assembly 23 has a support position and a retracted position, and in the inactive condition the turnup assembly 23 is in the retracted position, i.e. the position shown in fig. 4; in the working state (specifically, when the sidewall is reversely wrapped), the reversely wrapping component 23 is driven by the first driving component 24 to move leftwards along the axial direction of the cylinder 21, is switched to a supporting position, reversely wraps part of the sidewall in the process from the retracted position to the supporting position, and provides a supporting platform for the other part of the sidewall.

Fig. 14 shows a schematic view of the non-turnup sidewall 30 in the tire building and the turnup assembly 23 in the retracted position, in which the left end of the turnup assembly 23 is resting against the right end face of the lock ring assembly 22, the turnup assembly 23 being in a "lay down" condition overall, the sidewall 30 not being attached to the turnup assembly 23.

Fig. 15 shows a schematic view of the turnup assembly 23 in a supporting position, and it is obvious that the turnup assembly 23 is moved inward by a distance along the axial direction of the cylinder 21 under the action of the first driving assembly 24, and the turnup assembly 23 is further displaced radially outward during the movement, and the turnup assembly 23 is in an "upright" state as a whole, so that the top of the turnup assembly 23 contacts the bottom of the sidewall 30 and holds the sidewall 30 from below, and the inner end of the sidewall 30 is gradually attached to the carcass 40 as the turnup assembly 23 gradually moves radially outward (this action is the turnup), while the outer end of the sidewall 30 is at least partially in contact with the turnup assembly 23, i.e., in the supporting position, the turnup assembly 23 can also support the sidewall 30 that is not turnup, so as to avoid dropping of the sidewall 30. This portion of the sidewall 30 that is not deblocked will be subsequently deblocked by the post-press apparatus.

Referring back to fig. 4, the axially outer end (right end in fig. 4) of the turn-up assembly 23 is provided with a first driving assembly 24, the first driving assembly 24 surrounds the outer periphery of the cylinder 21, and the output end of the first driving assembly 24 can slide axially on the cylinder 21, so that the lower end of the turn-up assembly 23 connected with the output end is driven to move axially inside and outside on the cylinder 21, and the switching between the supporting position and the retracted position is realized. In addition, a second driving assembly 25 is further disposed on the outer periphery of the first driving assembly 24, and an inner end (a left end in fig. 4, as an output end of the second driving assembly 25) of the second driving assembly 25 is also connected to the turn-up assembly 23, when the turn-up assembly 23 performs the turn-up action, the second driving assembly 25 limits the turn-up assembly 23, ensures that the turn-up assembly 23 moves along a predetermined track, so that the left end of the turn-up assembly 23 applies a pressure required for turn-up to the sidewall, and when the turn-up assembly 23 is in the supporting position, the second driving assembly 25 can always maintain the turn-up assembly in the supporting position without movement.

In use, with reference to fig. 4, 14 and 15, the first building drum 20 is first connected to the outer periphery of the lock ring assembly 22 at one end of a bead, carcass or the like of rubber material constituting a green tyre; then the main shaft 11 drives the cylinder 21 to rotate, so that the rubber material is wound on the lock ring assembly 22; the outer periphery of the lock collar assembly 22 then expands radially outwardly, thereby securing the ends of the rubber material; then the air blowing holes 116 on the main shaft 11 blow air to the inner side of the rubber material, so that the rubber material is radially expanded to form the outline of the tire blank (the section is shown in fig. 14), and the tire sidewall 30 is still not attached to the tire body 40 and is in a flat state; the first drive assembly 24 then drives the turnup assembly 23 axially inwardly of the drum 21 such that the left end of the turnup assembly 23 engages the bead location and gradually moves upwardly along the carcass 40, during which the left end of the turnup assembly 23 will also contact the sidewalls 30 to engage the sidewalls 30 against the carcass 40 until the turnup assembly 23 moves to a support position (see fig. 15) at which time the left end of the turnup assembly 23 is at its highest and the turnup assembly 23 is maintained in the support position by the second drive assembly 25.

Fig. 6 shows a schematic view of the cylinder 21, the cylinder 21 being a cylindrical part, hollow in the interior, open at both ends and having a relatively large axial length, the cylinder 21 serving as a reference for the installation of the entire first forming drum 20. The middle portion of the barrel 21 has a first annular piston 244 in the shape of a circle, and the first annular piston 244 will act as a piston for the first drive assembly 24, the specific function of which will be described in detail later. The right end of the cylinder 21 is provided with the first connecting hole 211, as can be seen from fig. 6, the first connecting hole 211 is a through hole penetrating through the inner wall and the outer wall of the cylinder 21, and the right end surface of the first connecting hole 211 is defined by a flange 212 installed at the right end of the cylinder 21, so that the cylinder 21 can be conveniently installed on the periphery of the spindle 11 as long as the flange 212 is detached, the first protruding block 113 can be connected inside the first connecting hole 211, and then the flange 212 is fixed at the right end of the cylinder 21 through a bolt, so that the first protruding block 113 can be matched with the first connecting hole 211, and then the cylinder 21 and the spindle 11 can be coaxially connected, so that the cylinder 21 can rotate around the axis of the spindle 11 and can translate along the axis of the spindle 11.

As shown in fig. 4 and 5, each of the turn-up assemblies 23 is identical in structure and aligned in the axial direction, except that the respective turn-up assemblies 23 are located at different positions in the circumferential direction of the cylinder 21. The turn-up assembly 23 includes a link seat 231 provided on the outer circumference of the cylinder 21 and movable in and out of the axial direction by the driving of the first driving assembly 24, the link seat 231 having a substantially rectangular parallelepiped shape and extending in the longitudinal direction of the rectangular parallelepiped along the axial direction of the cylinder 21, the inner circumferential surface of the link seat 231 being slightly arcuate to be fitted to the circumferential surface. The left and right ends of the link seat 231 are respectively provided with a hinge joint, a connecting shaft is rotatably provided in the hinge joint, and lower ends of the anti-packet main rod 232 and the anti-packet auxiliary rod 233 are mounted on the connecting shaft so as to be pivotable in the hinge joint. In this embodiment, the turn-up main bar 232 and the turn-up sub bar 233 are straight bars, but in other embodiments, curved lines (e.g., arcs, fold lines) may be used. The upper ends of the turn-up main rod 232 and the turn-up auxiliary rod 233 are also rotatably provided with a support plate 234 through shaft connection, and the length direction of the support plate 234 extends along the axial direction of the cylinder 21, so that a plane four-rod mechanism is formed among the connecting rod seat 231, the turn-up main rod 232, the turn-up auxiliary rod 233 and the support plate 234, when the connecting rod seat 231 moves axially on the cylinder 21, the turn-up main rod 232 and the turn-up auxiliary rod 233 swing around the lower ends of the support plate 234, and then the support plate 234 is upwards supported or fallen, and when the support plate 234 is upwards supported, the support position is obtained; when the support plate 234 is lowered, it is in the retracted position. The left end of the support plate 234 (which may also be considered as a position toward the sidewall) is rotatably provided with a turn-up pinch roller 235, and during the upward supporting of the turn-up main lever 232 and the turn-up auxiliary lever 233, the left end of the turn-up pinch roller 235 will abut against the sidewall, and with the gradual increase of the supporting angle, the turn-up pinch roller 235 will gradually roll radially outwardly along the sidewall, thereby fitting the sidewall to the carcass.

Referring to fig. 14 and 15, in use, the first drive assembly 24 drives the linkage seat 231 to move leftward relative to the cylinder 21 so that the turn-up pinch roller 235 will exert a leftward force on the bottom of the sidewall 30 and at the same time the turn-up pinch roller 235 will be subjected to a rightward reaction force, causing the turn-up main lever 232 and the turn-up sub lever 233 to oscillate clockwise about their respective lower end points, whereby the turn-up pinch roller 235 will roll further upward by virtue of the oscillations of the turn-up main lever 232 and the turn-up sub lever 233 while the support plate 234 is also moved upward so as to prop up the otherwise flat sidewall 30 so that the sidewall 30 is supported on the upper end surface of the support plate 234 until the linkage seat 231 is moved to a predetermined position, at which time the support plate 234 is held in the support position (see fig. 15) so as to hold the sidewall 30, providing a support platform for the sidewall 30. After the unpacking is completed, the first driving assembly 24 drives the link seat 231 to move rightward relative to the cylinder 21, and the support plate 234 falls down again, i.e., returns to the retracted position.

As can be seen from fig. 15, when the supporting plate 234 is at the supporting position, the included angle α between the supporting plate 234 and the horizontal direction is 10-20 °, and under the action of the included angle, the supporting plate 234 forms a pretension to the non-turnup sidewall 30, and the pretension makes the portion of the sidewall 30 supported by the supporting plate 234 generate plastic deformation, so as to solve the problem of sidewall rebound.

Referring to fig. 15, in order to achieve the above-described inclination of the support plate 234, it is necessary to ensure that the upper end point of the turn-up main lever 232 is lower than the upper end point of the turn-up sub lever 233 in the support position, so that the outer end of the support plate 234 is relatively higher than the inner end, i.e., the support plate 234 as a whole exhibits an inclined arrangement. Further, in this embodiment, when the support plate 234 is in the support position, the turn-up main rod 232 and the turn-up sub rod 233 are parallel to each other, and the heights of the lower ends of the turn-up main rod 232 and the turn-up sub rod 233 are the same, in which case, in order to achieve that the upper end face of the turn-up main rod 232 is lower than the upper end point of the turn-up sub rod 233, it is necessary to ensure that the length of the turn-up sub rod 233 is slightly longer than the length of the turn-up main rod 232, so that when both the turn-up main rod 232 and the turn-up sub rod 233 are "standing", the upper end of the turn-up sub rod 233 will be slightly higher than the upper end of the turn-up main rod 232, and further the right end of the support plate 234 will be slightly higher than the left end of the support plate 234, i.e., the support plate 234 is embodied as an inclined arrangement. As for the angle of inclination, the length of the turn-up sub-lever 233 can be adaptively changed to perform fine adjustment to meet actual production needs.

Furthermore, the inventors have noted that the start of the pre-stretching should start from the highest point of the turn-up pinch roller 235, since this avoids bending of the sidewalls at the highest point of the turn-up pinch roller 235. More specifically, in the supporting position, the upper end surface of the supporting plate 234 should be not lower than the upper end point of the turn-up pinch roller 235 as a whole, and as can be seen in fig. 15, the upper end surface of the supporting plate 234 in this embodiment is located above the highest point of the turn-up pinch roller 235, so that the sidewalls are closely attached to the upper end surface of the supporting plate 234 after bypassing the highest point of the turn-up pinch roller 235, and thus each position of the portion of the sidewalls 30 is pre-stretched from the supporting plate 234.

In addition, the trailing end (right end in fig. 15) of the support plate 234 should be covered to the sidewall edge, that is, in the support position, the right end of the support plate 234 needs to be at least at the edge of the sidewall, preferably the right end of the support plate 234 exceeds the edge of the sidewall, so that the sidewall edge is prevented from springing back due to no pretension, and various positions of the sidewall at the upper end surface of the support plate 234 are ensured to be pretensioned.

As shown in fig. 4, a plurality of groups of rollers 236 are further arranged in the length direction of the supporting plate 234, the roller 236 at the most distal end is located at the outer side of the sidewall edge, and the upper end point of the roller 236 is located at least at the upper end surface of the supporting plate 234, so that the sidewall and the roller 236 can relatively slide in the gradual supporting process of the supporting plate 234, and mechanical overstretching of the sidewall in the process is avoided.

Furthermore, although the upper end surface of the support plate 234 in the present embodiment is a plane extending straight, the possibility of using a curved surface is not excluded, for example, in some embodiments, the upper end surface of the support plate 234 is an arc surface slightly raised upward or a curved surface formed by connecting a plurality of stages of fold lines, but whatever shape is adopted, it is necessary to ensure that the upper surface of the support plate 234 is inclined as a whole.

In order to ensure that the support plate 234 does not move easily when in the propped-up position, as shown in fig. 4, the planar four-bar mechanism needs to be limited, so in this embodiment, the middle part of the sub-wrapping rod 233 is further hinged with a limiting link 237, the outer end of the limiting link 237 is connected to the second driving assembly 25, and the second driving assembly 25 can drive the outer end of the limiting link 237 to move axially along the cylinder 21, so that the sub-wrapping rod 233 is correspondingly controlled to swing, and thus, when the support plate 234 moves to the supporting position, the second driving assembly 25 can fix the position of the sub-wrapping rod 233, so that the support plate 234 is always kept in the supporting position, and the support plate 234 is prevented from moving. The structure of the second driving assembly 25 will be described later, and will not be described here.

As shown in fig. 6 and 7, the first driving unit 24 is of a cylinder structure, and specifically includes an inner end cover 241 and an outer end cover 242 that form both end covers inside and outside the cylinder, a first cylinder tube 243 fixedly connected between the inner end cover 241 and the outer end cover 242 to form a cylinder side wall, and a first annular piston 244 as a cylinder piston, as described above in the present embodiment, the first annular piston 244 is fixedly provided on the outer circumferential surface of the cylinder body 21, so that the inner end cover 241, the outer end cover 242, and the first cylinder tube 243 will move axially on the cylinder body 21 when the cylinder is operated.

Specifically, as shown in fig. 7, the radially inner end of the first annular piston 244 is integrally formed on the outer surface of the cylinder 21, and the radially outer end of the first annular piston 244 is in sealing fit with the inner wall of the first cylinder 243 through a sealing ring, so that the inside of the first cylinder 243 is divided into two chambers which are not communicated, namely a left chamber 243a and a right chamber 243b, respectively, and therefore, only the air pressure in the left chamber 243a and the right chamber 243b needs to be controlled to realize the relative axial movement between the first annular piston 244 and the first cylinder 243, namely the inner end cover 241, the outer end cover 242 and the first cylinder 243 axially move on the cylinder 21.

As shown in fig. 8, in order to control the air pressure in the left chamber 243a and the right chamber 243b, a left air inlet and outlet hole 244a for air inlet and outlet is provided in the left chamber 243a, and a right air inlet and outlet hole 244b for air inlet and outlet is provided in the right chamber 243 b. For example, when the air pressure in the left chamber 243a needs to be increased, compressed air is only required to be ejected from the left air inlet/outlet hole 244a, and air in the right chamber 243b is only required to be ejected from the right air inlet/outlet hole 244 b; when the air pressure in the right chamber 243b needs to be increased, compressed air is ejected from the right air inlet/outlet hole 244b, and the air in the left chamber 243a is discharged.

Specifically, as shown in fig. 8, the left air inlet and outlet hole 244a is provided on the left side surface of the piston body 2442 so as to face the left chamber 243a, and at the same time, the inside of the cylinder 21 is provided with a first gas passage 213 communicating with the left air inlet and outlet hole 244a, and the gas inlet of the first gas passage 213 is located on the flange 212 at the end of the cylinder 21 so as to facilitate the subsequent connection with the gas line. Similarly, the right air inlet and outlet hole 244b is provided on the right side surface of the piston body 2442 so as to face the right chamber 243b, and the inside of the cylinder 21 is also provided with a second air passage 214 communicating with the right air inlet and outlet hole 244b, and the air inlet of the second air passage 214 is located on the flange 212 at the end of the cylinder 21 so as to be connected with the air pipe later.

The pressure in the left chamber 243a and the right chamber 143b can be freely controlled by the gas passage provided in the cylinder 21, so that the inner cover 241 is controlled to move axially on the cylinder 21, and the unpacking operation of the unpacking unit 23 is realized.

As shown in fig. 6, in the present embodiment, the inner end cap 241 is disposed on the side facing the turn-up assembly 23, and thus corresponds to the inner end cap 241 as the output end of the first driving assembly 24 for driving the link seat 231 to axially move on the cylinder 21. In order to smoothly fix the link seat 231 on the inner end cover 241, a cylindrical annular driving sleeve 245 is integrally formed at the inner end (left end in fig. 6) of the inner end cover 241, the inner circumferential surface of the annular driving sleeve 245 is slidably disposed on the outer surface of the cylinder 21, and the link seat 231 is fixedly disposed on the outer surface of the annular driving sleeve 245 through bolts, so that when the air pressure in the right chamber 243b is increased and the air pressure in the left chamber 243a is reduced, the inner end cover 241 drives the annular driving sleeve 245 to move leftwards on the cylinder 21, and the annular driving sleeve 245 drives the link seat 231 to move leftwards, thereby realizing switching of the supporting plate 234 from the retracted position to the supporting position.

As shown in fig. 5, a plurality of fixing locations are formed on the outer surface of the annular driving sleeve 245 around the circumferential direction, and the above-mentioned connecting rod seat 231 is fixedly disposed in the fixing locations, specifically, in this embodiment, the circumferential direction of the annular driving sleeve 245 is provided with an annular boss 2451 protruding radially outwards, and a plurality of mounting holes are circumferentially distributed on the annular boss 2451, and the positions where the mounting holes are located are the fixing locations. The bottom of connecting rod seat 231 is provided with the recess with annular boss 2451 adaptation, is provided with the connecting hole that corresponds with the mounting hole on the connecting rod seat 231, and the bolt passes connecting hole threaded connection in the mounting hole to fix connecting rod seat 231 on annular boss 2451.

As shown in fig. 4, a plurality of accommodating grooves 2411 with open ends are uniformly arranged on the circumferential direction of the inner end cover 241, the positions of the accommodating grooves 2411 and the positions of the anti-wrapping components 23 are in one-to-one correspondence, the middle part of the limiting connecting rod 237 is arranged inside the accommodating groove 2411, specifically, the limiting connecting rod 237 is in a circular arc shape with the middle part protruding radially outwards, and when the second driving component 25 drives the right end of the limiting connecting rod 237 to axially move, the middle part of the limiting connecting rod 237 is axially displaced in the accommodating groove 2411.

As shown in fig. 7, in order to facilitate assembly between the inner end cover 241, the outer end cover 242 and the first cylinder 243, axially protruding annular shoulders 2411, 2421 are provided on the inner walls of the inner end cover 241 and the outer end cover 242, respectively, the left end of the first cylinder 243 is fitted on the shoulder 2411 and fixedly connected with the inner wall of the inner end cover 241 by bolts, and the right end of the first cylinder 243 is fitted on the shoulder 2421 and fixedly connected with the inner wall of the outer end cover 242 by bolts.

Further, it is noted that when the three are axially moved on the cylinder 21, necessary limitation is required in the circumferential direction to avoid circumferential rotation during the axial movement. For this reason, in this embodiment, a stop rod 246 (see fig. 6) extending along the axial direction is fixedly disposed between the inner wall of the inner end cover 241 and the inner wall of the outer end cover 242, and the middle portion of the stop rod 246 is inserted into the stop hole 2441 of the first annular piston 244, so that when the inner end cover 241, the first cylinder 243 and the outer end cover 242 move together axially, the stop rod 246 will be drawn in the stop hole 2441 of the first annular piston 244, thereby preventing the inner end cover 241, the first cylinder 243 and the outer end cover 242 from rotating around the circumferential direction.

As shown in fig. 7, in order to facilitate the manufacture of the first annular piston 244, in this embodiment, the first annular piston 244 includes a piston body 2442 integrally formed on the cylinder 21 and a piston ring 2443 detachably mounted on the piston body 2442, and the piston body 2442 and the piston ring 2443 are fixedly connected by bolts, and after the connection, the two are formed into a complete first annular piston 244. By manufacturing the first annular piston 244 separately, machining difficulties are reduced.

The first drive assembly 24 is used as follows: when the connecting rod seat 231 needs to be driven to move leftwards to realize the anti-packing action, external compressed air enters from the first air channel 213 and is discharged from the left air inlet and outlet hole 244a, so that the air pressure in the left cavity 243a is increased and is larger than the air pressure in the right cavity 243b, and the air in the right cavity 243b is discharged to the outside from the right air inlet and outlet hole 244b, so that the inner end cover 241, the first cylinder 243 and the outer end cover 242 are driven to integrally move leftwards on the cylinder 21, and the annular driving sleeve 245 moves leftwards accordingly, namely the left movement of the connecting rod seat 231 is realized; when the rod seat 231 needs to be driven to move rightward for resetting, external compressed air enters from the second air channel 214 and is discharged from the right air inlet and outlet hole 244b, so that the air pressure in the right chamber 243b is increased and is larger than that in the left chamber 243a, and the air in the left chamber 243a is discharged to the outside from the left air inlet and outlet hole 244a, so that the inner end cover 241, the first cylinder 243 and the outer end cover 242 are driven to move rightward on the cylinder 21 integrally, and the annular driving sleeve 245 moves rightward accordingly, so that resetting of the rod seat 231 is realized.

As shown in fig. 7, it is clearly observed that the radially outer end 2422 of the outer cap 242 is located outside the outer surface of the first cylinder 243, i.e., the outer ring diameter of the outer cap 242 is larger than the second cylinder 243, thereby forming an L-shaped stepped surface at the junction of the second cylinder 243 and the outer cap 242, which will be one of the wall surfaces of the piston chamber 253 of the second drive assembly 25 hereinafter. Fig. 9 shows an exploded view of the second driving assembly 25, and it can be seen from the drawing that the second driving assembly 25 includes a second annular piston 251 slidably disposed on the outer circumferential surface of the first cylinder 243 in the axial direction, and a second cylinder 252 fixedly connected to the right end of the outer cap 242 and integrally surrounding the outer circumference of the first cylinder 243, and as shown in fig. 10, the radially outer end of the second annular piston 251 is sealingly connected to the inner wall of the second cylinder 252 by a sealing ring, so that a sealed piston chamber 253 is defined between the right side surface of the second annular piston 251, the inner wall of the second cylinder 252, the above-mentioned L-shaped step surface, and the outer wall of the first cylinder 243, and the second annular piston 251 can be driven to move axially within the annular region defined by the first cylinder 243 and the second cylinder 252 by controlling the air pressure inside the piston chamber 253.

As shown in fig. 9 and 10, the second driving assembly 25 further includes a driving ring 254 having a ring shape and fixedly coupled to the left side of the second ring piston 251, the driving ring 254 is sleeved on the outer surface of the first cylinder 243, and is axially movable along the outer surface of the first cylinder 243 by the driving of the second ring piston 251, and as can be seen from the drawing, the left end of the second cylinder 252 is opened, so that the left end of the driving ring 254 can be coupled to the outside, i.e., the driving ring 254 serves as an output member of the second driving assembly 25 for coupling with the limit link 237.

In this embodiment, as shown in fig. 9, the side of the driving ring 254 facing the unpacking assembly 23 is provided with a plurality of connection ports 2541 arranged around the circumference, the connection ports 2541 are provided with hinge shafts, and the right ends of the above limit links 237 are hinged on the hinge shafts, so that when the driving ring 254 moves axially, the limit links 237 can be driven to move axially, and the position of the unpacking auxiliary rod 233 is controlled, and in this embodiment, the driving ring is mainly used for keeping the unpacking auxiliary rod 233 in a supporting position to avoid the offset thereof.

As shown in fig. 9, a plurality of connecting rods 255 are provided between the driving ring 254 and the second annular piston 251, and the driving ring 254 is fixedly connected to the second annular piston 251 through the connecting rods 255.

As shown in fig. 10, in order to control the air pressure in the piston chamber 253, an air inlet and outlet 2531 for air inlet and outlet is provided in the piston chamber 253, and in this embodiment, the air inlet and outlet 2531 is provided on the outer end cover 243, more precisely, the air inlet and outlet 2531 is provided on the L-shaped step surface, so that the air pressure in the piston chamber 253 can be controlled only by connecting the nipple in the air pipe to the air inlet and outlet 2531. For example, by injecting compressed air into the inlet/outlet port 2531, the air pressure in the piston chamber 253 increases, so that the second annular piston 251 moves toward the left end, whereas, by pumping air out of the piston chamber 253, the air pressure in the piston chamber 253 decreases, so that the second annular piston 251 moves toward the right end under the action of the external atmospheric pressure.

The second drive assembly 25 is used as follows: in the process of the turn-up assembly 23 from the retracted position to the supporting position, the air in the piston cavity 253 is pumped out from the air inlet and outlet 2531, so that the air pressure in the piston cavity 253 is smaller than the external atmospheric pressure, the second annular piston 251 moves rightward along the outer surface of the first cylinder 243, and further drives the right end of the limit connecting rod 237 to move rightward, so that the right end of the limit connecting rod 237 is accommodated in the annular area surrounded by the first cylinder 243 and the second cylinder 252, and the position of the limit connecting rod 237 is ensured not to move, and the turn-up assembly 23 is ensured to be kept at the supporting position all the time. Conversely, when compressed air is filled into the piston chamber 253 through the air inlet/outlet 2531, the air pressure of the piston chamber 253 is higher than the external atmospheric pressure, so that the second annular piston 251 moves leftwards, the limit connecting rod 237 moves leftwards, and the turn-up assembly 23 is switched to the retracted position.

As shown in fig. 11 and 12, the lock ring assembly 22 includes an inner case 221 fixedly provided at an inner end of the cylinder 21, an outer case 222 provided opposite to the right side of the inner case 221 and forming an annular mounting port 223 with the inner case 221, a lock ring piston 224 provided between the inner case 221 and the outer case 222 slidably in an axial direction, and a lock ring block 225 provided on an outer periphery of the lock ring piston 224 and located in the mounting port 223, the lock ring block 225 radially extending or retracting in the mounting port 223 when the lock ring piston 224 moves axially inward and outward. It should be noted that there are a plurality of lock ring blocks 225, and they are uniformly distributed around the circumferential direction, and only one is shown as a schematic in fig. 11.

As shown in fig. 12, the inner case 221 includes a first end cap 2211 as a left end surface and a first circumferential wall 2212 provided at a right end of the first end cap 2211 and extending around a circumference to form a side wall, a center of the first end cap 2211 is formed with a through hole having a diameter corresponding to an opening of a left end of the cylinder 21 so that the cylinder 21 can be assembled to an outer circumference of the spindle 11 after the lock ring assembly 22 is mounted to the cylinder 21. The first end cap 2211 is fixedly connected with the left end of the cylinder 21 through bolts, and the inner shell 221 is fixedly installed on the cylinder 21. The right end periphery of the first circumferential wall 2212 is provided with a radially outwardly extending first ring 2213, the first ring 2213 constitutes a left side wall of the mounting opening 223, and the first ring 2213 is adapted to be fixedly connected with the outer housing 222, thereby relatively fixedly mounting the outer housing 222 on the cylinder 21.

As shown in fig. 12, the outer case 222 includes a second end cover 2221 as a right end surface and a second peripheral wall 2222 provided at a left end of the second end cover 2221 and extending around a circumference to form a side wall, the second peripheral wall 2222 having a smaller diameter than the first peripheral wall 2212, a second ring body 2223 extending radially outward being provided on an outer circumference of the second peripheral wall 2222, the second ring body 2223 being provided opposite to the first ring body 2213 with a distance therebetween to form the mounting port 223 therebetween. As shown in fig. 11, a plurality of fixing rods 226 (only one is shown in fig. 11, and 20-30 fixing rods are actually uniformly arranged around the circumferential direction) extending in the axial direction are arranged between the first ring body 2213 and the second ring body 2223 in the mounting opening 223, and the second ring body 2223 is fixedly connected to the first ring body 2213 through the fixing rods 226, namely, the outer shell 222 is fixedly connected to the inner shell 221.

With continued reference to fig. 12, an axial space is left between the inner casing 221 and the outer casing 222, in which space the lock ring piston 224 is disposed, and the inner surface of the lock ring piston 224 is slidably connected to the outer surface of the cylinder 21, the left end of the lock ring piston 224 is sealingly connected to the inner wall of the first peripheral wall 2212, the right end of the lock ring piston 224 is sealingly connected to the inner wall of the second peripheral wall 2222, so that a first chamber 224a is formed at the left end of the lock ring piston 224, a second chamber 224b is formed at the right end of the lock ring piston 224, and by controlling the air pressure of the first chamber 224a and the second chamber 224b, the axial movement of the lock ring piston 224 can be controlled correspondingly, for example, when the air pressure in the first chamber 224a is smaller than that in the second chamber 224b, the lock ring piston 224 will move to the left to the first working position, and the left end of the lock ring piston 224 abuts against the inner wall of the first end cap 2212, and the lock ring block 225 is in a contracted state; conversely, when the air pressure in the first chamber 224a is greater than the air pressure in the second chamber 224b, the lock ring piston 224 will move to the right to the second operating position, wherein the right end of the lock ring piston abuts against the inner wall of the second end cap 2222, and the lock ring block 225 is in an expanded state. By the above-described axial reciprocation of the lock ring piston 224 between the inner housing 221 and the outer housing 222, radial reciprocation of the lock ring block 225 in the mounting port 223 can be achieved, and since the two working positions of the lock ring piston 224 are defined by the inner housing 221 and the outer housing 222, respectively, the starting position and the ending position of the lock ring block 225 are determined, so that it can be ensured that the lock ring block 225 can provide uniform radial tension after expansion, thereby ensuring that the bead is stably expanded everywhere.

As shown in fig. 12, in order to realize the air pressure change of the first chamber 224a and the second chamber 224b, a first air inlet and outlet hole 2151 is provided on the outer surface of the cylinder 21 at a position corresponding to the first chamber 224a, a second air inlet and outlet hole 2161 is provided on the outer surface of the cylinder at a position corresponding to the second chamber 224b, a first air inlet and outlet channel 215 and a second air inlet and outlet channel 216 which are respectively communicated with the first air inlet and outlet hole 2151 and the second air inlet and outlet hole 2161 are provided inside the cylinder 21, and the right ends of the first air inlet and outlet channel 215 and the second air inlet and outlet channel 216 are air pipe interfaces connected with an external air source, in this embodiment, the air pipe interfaces are located on a flange 212 at the right end of the cylinder 21.

Fig. 13 shows a schematic view of a lock ring piston 224 and a lock ring block 225, and it can be seen from the figure that a plurality of mounting seats 2241 are fixedly arranged on the circumference of the lock ring piston 224 through bolts, connecting shafts are arranged on the mounting seats 2241, and the lock ring block 225 is connected with the connecting shafts through lock ring connecting rods 2251, so that the lock ring connecting rods 2251 drive the lock ring block 225 to move radially when the lock ring piston 224 moves axially. Specifically, as shown in fig. 11, a plurality of guide bars 2224 extending along a radial straight line are disposed on the left end surface of the second ring body 2223 around the circumferential direction, and corresponding to the guide bars 2224, guide grooves 2252 extending along a radial straight line are disposed on the lock ring block 225, and the guide grooves 2252 are slidably fitted on the guide bars 2224, so that when the lock ring block 225 is displaced in the radial direction, good guide is received without being deviated.

Further, as shown in fig. 13, the lock ring block 225 in the present embodiment includes a first lock ring block 225a and a second lock ring block 225b, the first lock ring block 225a and the second lock ring block 225b are alternately arranged in the circumferential direction to form a complete circle, and as is apparent from the figure, the first lock ring block 225a is much larger in size than the second lock ring block 225b, and in fact the arc length of the first lock ring block 225a is about three times that of the second lock ring block 225b, so designed because: after the radially outward expansion of the collar segments 225, a complete circle must be formed, and if all the collar segments 225 have the same dimensions, radial contraction cannot be achieved, for which purpose at least two collar segments 225 of different profile are required, for example in this embodiment, the diameter of the second collar segment 225b will be smaller than the diameter of the first collar segment 225a, i.e. the second collar segment 225b will be received between two adjacent first collar segments 225 a. In addition, radial contraction and expansion is more easily achieved when the arc length of one lock collar block 225 is relatively small.

As shown in fig. 13, in order to better accommodate the above-described expanding and contracting motions, the boundary line of the first lock ring block 225a is inclined, and is shown as being larger in the circumferential direction of the outer end closer to the radial direction, and correspondingly, the boundary line of the second lock ring block 225 is inclined in the opposite direction, and is shown as being smaller in the circumferential direction of the outer end closer to the proceeding direction.

In addition, since the length and the connection position of the lock ring link 2251 on the first lock ring block 225a and the lock ring link 225b are slightly different, it is possible to realize different diameters when they are contracted and the same diameter when they are expanded.

As shown in fig. 11 and 12, when the lock ring assembly 22 is in use, external compressed air enters the first air inlet and outlet channel 215 and enters the first chamber 224a from the first air inlet and outlet channel 2151, and the air pressure of the first chamber 224a is higher than that of the second chamber 224b, so that the lock ring piston 224 moves rightward, and as the lock ring piston 224 moves rightward, the lock ring connecting rod 2251 on the mounting seat 2241 swings around the lower end, so that the lock ring block 225 expands radially outwards along the guide bar 2224; conversely, when the external compressed air enters the second air inlet and outlet channel 216 and enters the second chamber 224b from the second air inlet and outlet hole 2161, the air pressure of the second chamber 224b is higher than that of the first chamber 224a, so that the lock ring piston 224 moves leftwards, the lock ring connecting rod 2251 on the mounting seat 2241 swings around the lower end, and the lock ring block 225 contracts radially inwards along the guide bar 2224.

In summary, the beneficial effects of the invention are as follows: when the turnup assembly 23 is in the supporting position, an included angle is formed between the supporting plate 234 and the horizontal direction, so that the supporting plate 234 forms pretension to the sidewall, and the pretension causes plastic deformation of the sidewall portion supported by the supporting plate 234, so that the problem of rebound of the sidewall is solved.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art. The generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A tire building machine employing a mechanical drum, comprising:

a spindle assembly (10),

a forming drum disposed at an outer periphery of a spindle assembly (10) and rotated around a circumferential direction by a drive of the spindle assembly (10), the forming drum comprising:

a cylinder (21) which is sleeved on the periphery of the main shaft assembly (10) and is locked with the main shaft assembly (10) in the circumferential direction,

a plurality of turn-up assemblies (23) surrounding the outer circumference of the cylinder (21) and axially aligned with each other, the turn-up assemblies (23) being driven by a first driving assembly (24) to move along the axial direction of the cylinder (21) so as to have a supporting position and a retracted position, and the turn-up assemblies (23) turn-up the sidewalls during the course from the retracted position to the supporting position,

The turn-up assembly (23) comprises: a support plate (234), the support plate (234) moving radially outwardly of the cylinder (21) during the return package assembly (23) from the retracted position to the support position to provide a support platform for the sidewall,

it is characterized in that the method comprises the steps of,

in the supporting position, the included angle between the supporting plate (234) and the horizontal plane is 10-20 degrees; the end, close to the side wall, of the supporting plate (234) is provided with a turn-up pinch roller (235), the turn-up pinch roller (235) rolls the side wall to realize turn-up in the process of the turn-up assembly (23) from a retracted position to a supporting position, and the upper end face of the supporting plate (234) is not lower than the upper end point of the turn-up pinch roller (235) in the supporting position;

the unpacking component (23) further comprises: the lower end of the connecting rod seat (231) is hinged with the connecting rod seat (231), the upper ends of the supporting plate (234) are hinged with the upper ends of the anti-wrapping main rod (232) and the anti-wrapping auxiliary rod (233), along with the axial movement of the connecting rod seat (231), the anti-wrapping main rod (232) and the anti-wrapping auxiliary rod (233) correspondingly swing, and then the supporting plate (234) is driven to prop up or fall in the radial direction, and in a supporting position, the upper end of the anti-wrapping auxiliary rod (233) is higher than the anti-wrapping main rod (232), so that an included angle is formed between the supporting plate (234) and a horizontal plane;

The anti-bag assembly (23) further comprises a limit connecting rod (237), one end of the limit connecting rod (237) is hinged with the anti-bag auxiliary rod (233), a second driving assembly (25) is arranged at the other end of the limit connecting rod (237), and the second driving assembly (25) drives the other end of the limit connecting rod (237) to axially move, so that the limit connecting rod (237) limits the position of the supporting plate (234) in the process of the anti-bag assembly (23) from the retracted position to the supporting position;

the second drive assembly (25) comprises: the second cylinder barrel (252) is arranged between the first driving assembly (24) and the second cylinder barrel (252) and moves along the axial direction, a piston cavity (253) is formed in the end, away from the side wall, of the second annular piston (251), an air inlet (2531) for air to enter and exit is formed in the piston cavity (253), a driving ring (254) is fixedly arranged at the end, facing the side wall, of the second annular piston (251), a connecting port (2541) which is arranged around the circumferential direction is formed in the side, facing the side wall, of the driving ring (254), a hinge shaft is arranged in the connecting port (2541), and the other end of the limiting connecting rod (237) is hinged on the hinge shaft.

2. Tyre building machine with mechanical drum according to claim 1, wherein in the supporting position the length of the supporting plate (234) exceeds the sidewall edge.

3. Tyre building machine with mechanical drum according to claim 1, characterized in that the turnup main bar (232) and the turnup sub bar (233) are arranged side by side and that the turnup sub bar (233) has a length greater than the turnup main bar (232).

4. Tyre building machine with mechanical drum according to claim 1, wherein the first drive assembly (24) comprises: the connecting rod seat (231) is fixedly arranged in the corresponding fixed position, so as to axially move on the cylinder body (21) along with the annular driving sleeve (245).

5. Tyre building machine with mechanical drum according to claim 4, wherein the first drive assembly (24) further comprises: an inner end cover (241) fixedly connected with the annular driving sleeve (245) and extending circumferentially around the cylinder body (21), an outer end cover (242) arranged at the outer end of the inner end cover (241) circumferentially and capable of axially moving on the outer periphery of the cylinder body (21), a first cylinder barrel (243) fixedly arranged between the inner end cover (241) and the outer end cover (242) and surrounding an annular area formed between the outer periphery of the cylinder body (21) and the cylinder body (21), and a first annular piston (244) positioned in the annular area and fixedly arranged on the cylinder body (21), wherein the radially outer end of the first annular piston (244) is hermetically connected to the inner wall of the first cylinder barrel (243), so that chambers (243 a;243 b) are respectively formed at two sides of the first annular piston (244), and the inner end cover (241), the first cylinder barrel (243) and the outer end cover (242) are controlled to axially move on the cylinder body (21) by changing the air pressure in the chambers (243a; 243 b).

6. Tyre building machine with mechanical drum according to claim 5, wherein the first annular piston (244) is provided on both sides with respective air inlet and outlet holes (244 a;244 b) communicating with the respective chambers (244 a;244 b), the drum (21) being internally provided with air channels (213; 214) communicating with the respective air inlet and outlet holes (244 a;244 b), the ends of the air channels (213; 214) extending onto a flange (212) provided at the end of the drum (21).

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