Single screw servo turn-up mechanical forming drum

Abstract

The present invention discloses a single-screw servo turn-up mechanical forming drum, which mainly includes a side drum, a hollow main shaft, a screw, a servo motor, a nut, a connecting key, a turn-up rod group, a positioning device and a locking device. Among them, the positioning device is designed with two structures and both can realize the locking between the turn-up rod group and the side drum, and the locking device can realize the locking between the side drum and the hollow main shaft. By adjusting the locking state of the positioning device and the locking device, the flat width adjustment and turn-up operation of the unvulcanized tire can be completed. Moreover, the positioning device has a compact structure, stable locking and a self-centering effect, which can make up for the accumulated walking error of the servo system in the process of driving the turn-up rod to perform the turn-up operation; the locking device cleverly uses the amplifying effect of the three-level inclined wedge surface force to hold the bearing tightly on the hollow main shaft, thereby realizing the locking of the side drum and the hollow main shaft, and its structure is compact, the realization process is simple, easy to maintain, and the locking is stable.

Description

Technical Field

[0001] The invention relates to the technical field of tire molding equipment, in particular to a single-screw servo turn-up mechanical molding drum. Background Art

[0002] A Chinese patent application (publication number: CN102036810B, publication date: 2013.04.03) discloses a tire building drum for building unvulcanized tires. The side drum is connected to the turn-up rod group by means of cylinder compression, and the side drum is locked by means of a toothed piston meshing with the main shaft. Since the minimum positioning accuracy is constrained by the size of the tooth shape, the teeth need to be made small enough. However, when the piston pressure is insufficient, the small teeth will slip and wear severely, and the connection reliability is poor. In addition, when the side drum is installed, the teeth on the outer wall of the main shaft will affect the sealing of the side drum.

[0003] A Chinese patent application (publication number: CN110549661A, publication date: 2019.12.10) discloses a locking device and a tire building drum. Among them, the side drum, the turn-up rod group and the main shaft are all locked by the friction force generated by the hydraulic brake. The hydraulic brake can only generate the required locking friction force through a sufficiently large positive pressure. When the brake on the main shaft sleeve acts, its excessive positive pressure will cause the main shaft sleeve to deform, and then cause it to be easily locked with the main shaft, or cause it to be worn with the main shaft. The pressure is small and not enough to generate enough friction. As mentioned above, the pressure of its force transmission medium can reach hundreds of MPa, and the corresponding seal life will be affected by this. In addition, the locking device described therein is difficult to implement, and special requirements are required for materials, seals, etc., and it is difficult to maintain.

[0004] In addition, although the servo-driven lead screw performs precise walking positioning, a small walking error will still occur each time. After multiple walking positioning, the relative position of the side drum and the turn-up rod group will be offset, which will cause the forming drum to be unable to complete the corresponding process. Summary of the invention

[0005] The purpose of the present invention is to make up for the shortcomings of the prior art and provide a single-screw servo turn-up mechanical forming drum with good locking effect and self-centering function.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A single-screw servo turn-up mechanical forming drum, comprising a side drum, a hollow main shaft, a screw, a servo motor, a nut, a turn-up rod group, a connecting key and a locking device, wherein the side drum has two sets and is symmetrically slidably sleeved on the hollow main shaft and is used to lock the unvulcanized tire, the screw coaxially passes through the interior of the hollow main shaft and is driven to rotate by the servo motor, the nut has two and is symmetrically connected to the two sides of the screw in opposite directions, the turn-up rod group has two sets and is symmetrically sleeved on the two sets of the side drums one by one and is used to realize the turn-up operation of the unvulcanized tire, the connecting key has two sets and is used to realize the two nuts and the two sets of The reverse rod groups are connected one by one, and the locking devices are two sets, which are symmetrically installed on the two sets of side drums one by one and are used to achieve locking between the two sets of side drums and the hollow main shaft; each of the locking devices includes a second annular shell, a second annular piston, a second steel ball, a wedge sleeve and a bearing; in the same locking device, the second annular shell is matched and slidably mounted on the hollow main shaft and fixedly connected to the shaft sleeve of one of the side drums, and an annular opening is also opened on the inner wall of the second annular shell; in the same locking device, the second annular piston is slidably mounted inside the second annular shell and fixes the second annular The inner cavity of the outer shell is divided into a second left air cavity and a second right air cavity, the second left air cavity and the second right air cavity are both connected to a second air pump, and a second annular piston cone surface is also formed on the inner wall of the second annular piston; in the same locking device, there are multiple bearing shells and they are evenly distributed circumferentially on the outer wall of the hollow main shaft, there are two wedge sleeves, and the two wedge sleeves and multiple bearing shells are also placed in the annular opening of the second annular outer shell, the two wedge sleeves respectively use the wedge sleeve inner cone surfaces on their respective inner walls to press symmetrically on the bearing shell cone surfaces on both sides of the outer walls of each bearing shell, a wedge sleeve side cone surface is also formed on one side surface of the wedge sleeve, and the wedge sleeve An annular groove is also formed between the side cone surface and the side wall of the annular opening; in the same locking device, there are multiple second steel balls and they are evenly distributed circumferentially between the annular groove and the second annular piston cone surface; in the same locking device, the second annular piston is driven to slide in the second annular outer shell by the second air pump; the second annular piston cone surface is used to squeeze each of the second steel balls to move, and push the two wedge sleeves to jointly squeeze each of the bearing shells to hold the hollow main shaft; or the squeezing of each of the second steel balls is released, and then the squeezing of the two wedge sleeves on the bearing shells is released to loosen the hollow main shaft.

[0008] Furthermore, each of the locking devices also includes two elastic rubber rings. In the same locking device, a wing plate is provided on the outer side of each bearing shell. The two elastic rubber rings are both expanded outward and are arranged on the inner side of the wing plate of each bearing shell to drive each bearing shell to loosen the hollow main shaft when the clamping of the hollow main shaft is released.

[0009] Furthermore, the single-screw servo turn-up mechanical forming drum is also provided with a positioning device, which can be two sets of symmetrically arranged first positioning devices, each of which is respectively mounted on one of the side drums, and each of which is also respectively connected to one of the turn-up rod groups through the connecting key, and each of the first positioning devices includes a third annular shell, a third annular piston and a third steel ball; in the same first positioning device, the third annular shell is matched and slidably mounted on a sleeve of the side drum, and a plurality of circular holes are also circumferentially evenly distributed on the inner wall of the third annular shell; in In the same first positioning device, the third annular piston is slidably installed inside the third annular shell and divides the inner cavity of the third annular shell into a third left air cavity and a third right air cavity, the third left air cavity and the third right air cavity are both connected to a third air pump, and a third annular piston conical surface is also formed on the inner wall of the third annular piston; in the same first positioning device, the third steel balls are multiple and one-to-one correspondingly installed in the multiple circular holes, and the sleeve of each side drum is also circumferentially evenly provided with multiple conical grooves, and the multiple conical grooves and the multiple third steel balls are one-to-one correspondingly. The third steel balls are used in conjunction with each other, and the plurality of the third steel balls are also arranged between the tapered surface of the third annular piston and the outer wall of the corresponding sleeve or between the tapered surface of the third annular piston and each tapered groove; in the same first positioning device, the third annular piston is driven to slide in the third annular housing by the third air pump; the tapered surface of the third annular piston is used to press each of the third steel balls into the corresponding tapered groove, so that each of the third steel balls is pressed between the tapered surface of the third annular piston and the corresponding tapered groove, so as to lock the first positioning device in the corresponding first positioning device. or release the squeezing of each of the third steel balls, and when the first positioning device slides along the corresponding sleeve driven by the corresponding connecting key, each of the third steel balls rolls from the corresponding conical groove to the outer wall of the corresponding sleeve, so that each of the third steel balls is pressed between the conical surface of the third annular piston and the outer wall of the corresponding sleeve, so as to release the lock between the first positioning device and the corresponding sleeve, and further release the lock between the sleeve and the corresponding sleeve.

[0010] Furthermore, a plurality of support grooves are evenly distributed circumferentially on the outer wall of the third annular shell in each of the first positioning devices. In the same first positioning device, each of the support grooves is used to support each turn-up rod in the corresponding turn-up rod group one by one.

[0011] Furthermore, the single-screw servo turn-up mechanical forming drum is also provided with a positioning device, which can also be two sets of second positioning devices, the two sets of second positioning devices are symmetrically mounted on the hollow main shaft, and each of the second positioning devices is also fixedly connected to a sleeve, each of the second positioning devices comprises a fourth annular shell, a fourth annular piston, a hinged rod and a sliding latch; in the same second positioning device, the fourth annular shell is slidingly mounted on the hollow main shaft in a matching manner, one end of the fourth annular shell is formed with an inner cavity, and the other end is provided with an annular plate, and a plurality of radially arranged guide rails are evenly distributed circumferentially on the side end surface of the annular plate, and a sliding latch is slidably installed on each of the guide rails, and each of the sliding latches is used in conjunction with a slot, wherein a plurality of the slots are evenly distributed circumferentially on the inner wall of the end portion of the turn-up rod base of a turn-up rod group; in the same second positioning device, the fourth annular piston is a sleeve-shaped device with a step formed on the outer wall. The fourth annular piston is slidably mounted on the fourth annular shell, and the large-diameter end of the fourth annular piston divides the inner cavity of the fourth annular shell into a fourth left air cavity and a fourth right air cavity, both of which are connected to a fourth air pump, and the small-diameter end of the fourth annular piston penetrates the inner cavity of the fourth annular shell and extends to one side of the annular plate; in the same second positioning device, each of the sliding latches is hinged to the small-diameter end of the fourth annular piston through a hinge rod; in the same second positioning device, the fourth annular piston is driven to slide on the fourth annular shell by the fourth air pump, so as to drive each of the sliding latches to perform radial expansion and contraction movement along the corresponding guide rails, and then each of the sliding latches is inserted into the corresponding slots or pulled out from the corresponding slots, so as to realize the locking or unlocking between the turn-up rod group and the corresponding shaft sleeve.

[0012] Furthermore, each of the side drums includes a shaft sleeve and a tire support mechanism, and each of the tire support mechanisms includes a first annular shell, a first annular piston, a connecting rod and a locking block; in the same side drum, the shaft sleeve is slidingly mounted on the hollow main shaft in a matching manner; in the same side drum, the first annular shell is fixedly connected to the shaft sleeve, and a guide ring groove is also provided on the outer wall of the first annular shell; in the same side drum, the first annular piston is slidably installed inside the first annular shell and divides the inner cavity of the first annular shell into a first left air cavity and a first right air cavity, and the first left air cavity and the first right air cavity are both connected to a first air pump; in the same side drum, there are multiple locking blocks and they are evenly distributed circumferentially in the guide ring groove, and each of the locking blocks is hinged to the first annular piston through a connecting rod; in the same side drum, the first annular piston is driven by the first air pump to slide in the first annular shell to drive each of the locking blocks to perform radial expansion and contraction movement along the guide ring groove to achieve locking or unlocking of the unvulcanized tire.

[0013] Furthermore, the hollow main shaft and the two sleeves are provided with guide grooves for the connecting keys to pass through, and one end of each connecting key is fixedly connected to the corresponding nut, and the other end is fixedly connected to a turn-up rod base.

[0014] Furthermore, each of the turn-up rod groups comprises a turn-up rod base and a plurality of turn-up rods evenly distributed circumferentially around the hollow main shaft, each of the turn-up rod bases is slidably mounted on the corresponding sleeve in a matching manner, one end of each of the turn-up rods is hinged to the corresponding turn-up rod base, and a turn-up roller is installed on the other end.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: two positioning devices and locking devices are designed in the present invention, wherein the two positioning devices are compact in structure, firmly locked and have self-centering effect, and can compensate for the accumulated walking errors of the servo system in the process of driving the turn-up rod to perform the turn-up operation; the locking device has a compact structure, a simple process, is easy to maintain and firmly locked, and it cleverly utilizes the amplifying effect of the force of the three-stage inclined wedge surface to clamp the bearing shell on the hollow main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the advantages of the present invention more easily understood, the present invention briefly described above will be described in more detail by referring to the specific embodiments shown in the accompanying drawings. It is understood that these drawings only depict typical embodiments of the present invention and therefore should not be considered as limiting the scope of protection thereof, and the present invention is explained by the accompanying drawings with additional characteristics and detailed descriptions.

[0017] Figure 1 This is a schematic diagram of the main cutaway structure of Embodiment 1 of the present invention;

[0018] Figure 2 This is a schematic diagram of the main cutaway structure of Example 1 of the present invention in the reverse packaging operation state;

[0019] Figure 3 is a schematic structural diagram of a first positioning device in Embodiment 1 of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of the locking device in Example 1 of the present invention;

[0021] Figure 5 This is a schematic diagram of the main cutaway structure of Embodiment 2 of the present invention;

[0022] Figure 6 This is a schematic diagram of the main cutaway structure of Example 2 of the present invention in the reverse packaging operation state;

[0023] Figure 7 Schematic diagram of the structure of the second positioning device in Example 2 of the present invention.

[0024] Among them, 1-side drum, 11-shaft sleeve, 111-conical groove, 12-tire support mechanism, 121-first annular shell, 122-first annular piston, 123-connecting rod, 124-locking block, 2-hollow main shaft, 21-guide groove, 3-screw, 4-nut, 5-connecting key, 6-turn-up rod group, 61-turn-up rod base, 611-slot, 62-turn-up rod, 63-turn-up roller, 7-first positioning device, 71-third annular shell, 72- The third annular piston, 73-the third steel ball, 74-the supporting groove, 8-the second positioning device, 81-the fourth annular shell, 82-the fourth annular piston, 83-the hinge rod, 84-the sliding latch, 85-the annular plate, 9-the locking device, 91-the second annular shell, 92-the second annular piston, 93-the bearing, 94-the wing plate, 95-the left wedge sleeve, 96-the right wedge sleeve, 97-the second steel ball, 98-the elastic rubber ring, 99-the annular groove, 10-the unvulcanized tire. DETAILED DESCRIPTION

[0025] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the embodiments of the present invention, some technical features well known in the art are not described.

[0026] In order to fully understand the embodiments of the present invention, detailed structures will be presented in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0027] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0028] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0029] Example 1

[0030] See also Figures 1 to 4 The present embodiment provides a single-screw servo turn-up mechanical forming drum, which mainly includes a side drum 1, a hollow main shaft 2, a screw 3, a servo motor (not shown in the figure), a nut 4, a connecting key 5, a turn-up rod group 6, a first positioning device 7 and a locking device 9. Among them, there are two sets of side drums 1 and they are symmetrically installed on the hollow main shaft 2. The two sets of side drums 1 are mainly used to lock the unvulcanized tire 10; the hollow main shaft 2 is fixed to the frame of the forming drum as a support for the entire forming drum; the screw 3 coaxially passes through the interior of the hollow main shaft 2 and rotates under the drive of the servo motor; there are two nuts 4 and they are used in conjunction with the screw 3. The two nuts 4 are symmetrically installed on the screw 3 with opposite rotation directions, and each nut 4 is also connected with a set of connecting keys 5 respectively; there are two sets of connecting keys 5 and they are used in conjunction with the two nuts 4 one by one. The two sets of connecting keys 5 are symmetrically arranged and radially pass through the corresponding hollow main shaft 2 and the shaft sleeves 11 of the two side drums 1. Correspondingly, symmetrical openings are made on the shaft sleeves 11 of the hollow main shaft 2 and the two side drums 1 There is a guide groove 21, which can be used for the connecting key 5 to pass through and serves as a guide for the connecting key 5; there are two sets of turn-up rod groups 6, which are hinged to the two sets of connecting keys 5 one by one, and the two sets of turn-up rod groups 6 are symmetrically arranged and used to turn up the unvulcanized tire 10; there are two sets of first positioning devices 7, which are fixedly connected to the two sets of connecting keys 5 one by one, and the connecting keys 5, turn-up rod groups 6 and first positioning devices 7 used in conjunction with the same side drum 1 are fixed together, and the first positioning device 7 is mainly used for locking between the side drum 1 and the turn-up rod group 6, and has a centering effect; there are two sets of locking devices 9, which are fixedly connected to the two sets of side drums 1 one by one, and are mainly used to achieve locking between the two sets of side drums 1 and the hollow main shaft 2.

[0031] like Figure 1 and Figure 2As shown, in this embodiment, the two sets of side drums 1 have consistent structures and are symmetrically arranged. Now, taking one side drum 1 as an example, its structure is described in detail: the side drum 1 includes a shaft sleeve 11 and a tire support mechanism 12.

[0032] The sleeve 11 is matched and mounted on the hollow main shaft 2 and can be matched and slid on the hollow main shaft 2. When the first positioning device 7 is in a locked state and the locking device 9 is in an unlocked state, the servo motor drives the lead screw 3 to rotate, and then the driving force can be transmitted to the sleeve 11 through the nut 4, the connecting key 5 and the first positioning device 7, and the sleeve 11 and the locking device 9 can be driven to slide along the hollow main shaft 2.

[0033] The tire supporting mechanism 12 includes a first annular housing 121 , a first annular piston 122 , a connecting rod 123 and a locking block 124 . Among them, the first annular shell 121 is annular as a whole and is fixed to one end of the sleeve 11 close to the unvulcanized tire 10. The first annular shell 121 and the sleeve 11 can be made into one piece or welded together; an inner cavity is formed inside the first annular shell 121, and a first annular piston 122 is slidably installed in the inner cavity, and the first annular piston 122 divides the inner cavity into a first left air cavity and a first right air cavity. The first left air cavity and the first right air cavity are both connected to a first air pump, and the first annular piston 122 can be driven to move left and right by filling and discharging air into the first left air cavity and the first right air cavity through the first air pump; a guide ring groove is also opened on the outer wall of the first annular shell 121, and the guide ring groove is not connected with the first left air cavity and the first right air cavity under the blocking effect of the first annular piston 122, and a plurality of locking blocks 124 are distributed circumferentially in the guide ring groove, and each locking block 124 is also hinged to the first annular piston 122 through a connecting rod 123. The first air pump can drive the first annular piston 122 to slide in the first annular housing 121, thereby driving the connecting rods 123 to move, and then the connecting rods 123 drive the locking blocks 124 to expand and contract along the radial direction of the guide ring groove. When the locking blocks 124 expand outward, the unvulcanized tire 10 can be locked to facilitate the subsequent processes of the unvulcanized tire 10. When the locking blocks 124 shrink inward, the lock of the unvulcanized tire 10 can be released to facilitate the removal of the unvulcanized tire 10.

[0034] like Figure 1 and Figure 2As shown, in the present embodiment, the two sets of connecting keys 5 have the same structure and are symmetrically arranged. Now, taking one set of connecting keys 5 as an example, its structure is described in detail: one set of connecting keys 5 includes two guide rods, which are symmetrically arranged up and down, and the first ends of the two guide rods are respectively fixed to the nut 4, and the second ends respectively pass through the hollow main shaft 2 and the guide grooves 21 opened on the sleeve 11 and extend outward, wherein the widths of the guide rods and the guide grooves 21 are consistent, and driven by the nut 4, the two guide rods can move left and right (i.e., axial movement) along the guide grooves 21, and the second ends of the two guide rods are also connected to the first positioning device 7 and the turn-up rod group 6, thereby driving the first positioning device 7 and the turn-up rod group 6 to move left and right.

[0035] like Figure 1 and Figure 2 As shown, in this embodiment, the two sets of turn-up rod groups 6 have the same structure and are symmetrically arranged. Now, taking one set of turn-up rod group 6 as an example, its structure is described in detail: the turn-up rod group 6 includes a turn-up rod base 61, a plurality of turn-up rods 62 and a turn-up roller 63 uniformly arranged around the hollow main shaft 2 in the circumferential direction. The turn-up rod base 61 is matched and slidably sleeved on the shaft sleeve 11. The turn-up rod base 61 is also fixedly connected to the connecting key 5. One end of each turn-up rod 62 is hinged to the turn-up rod base 61, and the other end is equipped with a turn-up roller 63. The turn-up rod group 6 is mainly used to realize the turn-up operation. When the first positioning device 7 is in the unlocked state and the locking device 9 is in the locked state, driven by the connecting key 5, each turn-up rod 62 in the turn-up rod group 6 swings around the hinge point on the turn-up rod base 61, and the turn-up roller 63 on each turn-up rod 62 can perform a rolling operation along the sidewall of the unvulcanized tire 10.

[0036] like Figures 1 to 3 As shown, in this embodiment, the two sets of first positioning devices 7 have the same structure and are symmetrically arranged. Now, taking one set of first positioning devices 7 as an example, its structure is described in detail: the first positioning device 7 includes a third annular shell 71, a third annular piston 72 and a third steel ball 73.

[0037] The third annular shell 71 is matchedly mounted on the shaft sleeve 11 of the side drum 1, and the outer portion of the third annular shell 71 is also fixedly connected to the connecting key 5. Driven by the connecting key 5, the third annular shell 71 can slide on the shaft sleeve 11; an inner cavity is formed inside the third annular shell 71, and a third annular piston 72 is slidably installed in the inner cavity, and the third annular piston 72 divides the inner cavity into a third left air cavity and a third right air cavity. The third left air cavity and the third right air cavity are both connected to a third air pump, and the third annular piston 72 can be driven to move left and right by charging and discharging air into the third left air cavity and the third right air cavity through the third air pump; the lower portion of the third annular piston 72 is shaped A conical surface is formed and defined as the conical surface of the third annular piston 72; a plurality of circular holes are evenly distributed circumferentially on the inner wall of the third annular shell 71, and the diameter of each circular hole is greater than its own height. A third steel ball 73 is placed in each circular hole, and the diameter of the third steel ball 73 is the same as the diameter of the circular hole. The third steel ball 73 can move in the circular hole, and the upper part of the third steel ball 73 placed in the circular hole contacts the conical surface of the third annular piston 72. Correspondingly, a plurality of conical grooves 111 are evenly distributed circumferentially on each sleeve 11, and the number of the conical grooves 111 is consistent with the number of the third steel balls 73, and the two are used in a one-to-one corresponding manner.

[0038] The movement of the third annular housing 71 is achieved by the servo motor driving the lead screw 3, and the position of the third annular housing 71 can be accurately given by the servo system. Figure 3As shown, when the circular hole on the third annular housing 71 is aligned with the tapered groove 111 on the sleeve 11, the third air pump inflates the third right air chamber, the third annular piston 72 moves to the left, and the third annular piston 72 conical surface presses the third steel ball 73 into the tapered groove 111 on the sleeve 11. At this time, the third annular housing 71 will be locked on the sleeve 11. Since the connecting key 5 and the turn-up rod group 6 are both fixedly connected to the third annular housing 71, the connecting key 5 and the turn-up rod group 6 are also locked on the sleeve 11. Thanks to the appropriate small angle of the conical surface of the third annular piston 72, the mechanism has a certain self-locking performance, and providing a small inflation pressure to the third right air chamber can provide a stable positioning for the third annular housing 71; and the positioning of the first positioning device 7 has a self-centering effect, which can compensate for the cumulative error in the repeated walking process of the servo system, and can always position the third annular housing 71 at the same position of the corresponding sleeve 11, so as to ensure that the turn-up rod group 6 always has the same initial position on the corresponding sleeve 11. When the third air pump inflates the third left air chamber, the third annular piston 72 moves to the right. At this time, the first positioning device 7 enters a non-positioning state (i.e., an unlocked state). Since there is just enough space between the sleeve 11 and the third annular piston 72 to accommodate the third steel ball 73 (the space is not connected to the third left air chamber and the third right air chamber), when the third annular shell 71 moves in either direction, the third steel ball 73 will naturally be pushed up along the inclined wall of the conical groove 111 and enter the space accommodating the third steel ball 73. Then, the third annular shell 71 can move freely and unhindered in the axial direction, so that the turn-up rod group 6 can move relative to the sleeve 11, thereby providing conditions for the turn-up rod group 6 to perform the turn-up operation.

[0039] Furthermore, a plurality of support grooves 74 are evenly distributed circumferentially on the outer wall of the third annular shell 71. The number of the support grooves 74 is consistent with the number of the turn-up rods 62 in the turn-up rod group 6. Each support groove 74 is used in conjunction with each turn-up rod 62 in a one-to-one correspondence. Each support groove 74 is used to accommodate and support each turn-up rod 62 in the turn-up rod group 6 in a retracted state.

[0040] Furthermore, in order to ensure that the third annular piston 72 can be smoothly installed in the third annular housing 71 , the third annular housing 71 may be reasonably divided, and the sealing assembly may be performed after the third annular piston 72 is installed.

[0041] like Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the two sets of locking devices 9 have the same structure and are symmetrically arranged. Now, taking one set of locking devices 9 as an example, its structure is described in detail: the locking device 9 includes a second annular housing 91, a second annular piston 92, a bearing 93, a wedge sleeve, a second steel ball 97 and an elastic rubber ring 98.

[0042] The second annular shell 91 is matchedly mounted on the hollow main shaft 2, and the exterior of the second annular shell 91 is also fixedly connected to the sleeve 11 of the side drum 1 and the second annular shell 91 is located at the end of the sleeve 11 away from the tire support mechanism 12, and the second annular shell 91 can slide on the hollow main shaft 2 together with the sleeve 11; an inner cavity is formed inside the second annular shell 91, and a second annular piston 92 is slidably installed in the inner cavity, and the second annular piston 92 divides the inner cavity into a second left air cavity and a second right air cavity, and the second left air cavity and the second right air cavity are both connected to a second air pump, and the second annular piston 92 can be driven to move left and right by filling and discharging air into the second left air cavity and the second right air cavity by the second air pump; a conical surface is formed on the inner wall of the second annular piston 92 and is defined as the second annular piston conical surface; an annular opening is also opened on the inner wall of the second annular shell 91, and the annular opening is blocked by the second annular piston 92 and is connected to the second left air cavity and The second right air cavity is not connected, and a second steel ball 97, a wedge sleeve and a bearing 93 are placed in the annular opening; there are multiple bearings 93 and they are evenly distributed on the outer wall of the hollow main shaft 2 in the circumferential direction, and there is a certain gap between each bearing 93, so that each bearing 93 can have space to accommodate the deformation of the bearing 93 when it is compressed, and two conical surfaces are symmetrically formed on the outer wall of each bearing 93 and are defined as the conical surfaces of the bearing 93, and the two conical surfaces of the bearing 93 located on the same bearing 93 are formed on both sides of the outer wall of the bearing 93, and the middle part of the outer wall of each bearing 93 also protrudes outward to form a wing plate 94; there are two wedge sleeves and they are all annular structures, and a conical surface is also formed on the inner wall of each wedge sleeve and is defined as the inner conical surface of the wedge sleeve, and the two wedge sleeves use their own inner conical surfaces of the wedge sleeve to symmetrically press on the two conical surfaces of the bearing 93 on the outer wall of each bearing 93, and the two wedge sleeves are defined as the left wedge sleeve 95 and the right wedge sleeve 96, respectively. Figure 4 As shown, a partition is further provided between the second right air cavity and the annular opening, and the right wedge sleeve 96 is positioned and assembled at the angle formed by the inner wall of the partition and a side wall of the annular opening. A conical surface is formed on the side of the left wedge sleeve 95 away from the bearing 93 and is defined as the wedge sleeve side conical surface. The wedge sleeve side conical surface and the other side wall of the annular opening form an annular groove 99, wherein the other side wall of the annular opening is a conical surface and the cross-section of the annular groove 99 is trapezoidal; the second steel balls 97 are multiple and circumferentially evenly distributed between the annular groove 99 and the second annular piston cone surface; there are two elastic rubber rings 98 and they are separately disposed on the inner wall of the wing plate 94 of each bearing 93, and the two elastic rubber rings 98 are in a state of expanding outwards. When the clamping of the hollow main shaft 2 is released, each bearing 93 can be expanded outwards to loosen the hollow main shaft 2.

[0043] like Figure 4As shown, the working principle of the locking device 9 is as follows: when the second air pump inflates the second left air chamber, the second annular piston 92 moves to the right, and the conical surface of the second annular piston squeezes the second steel ball 97 to move inward, pushing the left wedge sleeve 95 to move to the right, so that each bearing 93 hugs the hollow main shaft 2 under the joint extrusion of the left wedge sleeve 95 and the right wedge sleeve 96, and the side drum 1 and the hollow main shaft 2 are relatively fixed by the locking of the locking device 9. When the second air pump inflates the second right air chamber, the second annular piston 92 moves to the left, and the squeezing of the second steel ball 97 is released at this time, so that each bearing 93 expands under the action of the elastic rubber ring 98 and releases the hollow main shaft 2, so as to release the locking of the locking device 9. At the same time, the elastic rubber ring 98 can ensure that each bearing 93 is always in an expanded state under natural conditions, making it more convenient to disassemble and assemble the locking device 9 as a whole. According to the amplifying effect of the inclined surface force, when the driving force given by the second annular piston 92 is transmitted to the bearing 93, it undergoes three levels of amplification, so that the bearing 93 can generate a positive pressure of a hundred times the piston pressure on the hollow main shaft 2. According to the principle of static friction, the locking device 9 can firmly hold the hollow main shaft 2.

[0044] Furthermore, in order to ensure that the second annular piston 92 can be smoothly installed in the second annular housing 91, the second annular housing 91 can be reasonably divided, and the sealing assembly can be performed after the second annular piston 92 is installed.

[0045] The working principle of this embodiment is as follows: when working, first install the unvulcanized tire 10 between the two sets of side drums 1 and lock them using the two tire support mechanisms 12, adjust the first positioning device 7 to be in a locked state (that is, the nut 4, connecting key 5, first positioning device 7, side drum 1, locking device 9 and turn-up rod group 6 used in conjunction with each other can be relatively fixed), and the locking device 9 is in an unlocked state (that is, the side drum 1 and the hollow main shaft 2 used in conjunction with each other can be unlocked), the servo motor drives the lead screw 3 to rotate, and then drives the two nuts 4 to move apart and together (that is, the two nuts 4 move toward or away from each other synchronously), and because the first positioning device 7 is in a locked state, the two sets of connecting keys 5 will synchronously drive the two sets of side drums 1 and the two sets of side drums 1 along their respective guide grooves 21. The turn-up rod group 6 moves with the two nuts 4 to adjust the distance between the two tire support mechanisms 12, thereby completing the flat width adjustment of the unvulcanized tire 10; then the first positioning device 7 is adjusted to be in an unlocked state, and the locking device 9 is in a locked state, and the servo motor drives the screw 3 to rotate, thereby driving the two nuts 4 to move apart and together. Since the first positioning device 7 is in an unlocked state, the two sets of connecting keys 5 will synchronously drive the two sets of turn-up rod groups 6 to move along their respective guide grooves 21 along the two nuts 4, and each turn-up rod 62 in the two sets of turn-up rod groups 6 will swing along the corresponding turning point on the turn-up rod base 61, and make the turn-up roller 63 roll on both sides of the unvulcanized tire 10, thereby completing the turn-up operation of the unvulcanized tire 10.

[0046] Example 2

[0047] The difference between this embodiment and the first embodiment is that the installation position of the locking device 9 is different and the structure and principle of the positioning device are different.

[0048] The two sets of locking devices 9 in Example 1 are symmetrically fixed to the ends of the two shaft sleeves 11 away from the tire support mechanism 12, while in this embodiment, each locking device 9 is respectively fixed between the corresponding shaft sleeve 11 and the tire support mechanism 12. This design helps to provide sufficient installation space for the second positioning device and will not interfere with the second positioning device.

[0049] In this embodiment, the two sets of first positioning devices 7 in Embodiment 1 are replaced by two sets of second positioning devices 8. Figures 5 to 7 As shown, the two sets of second positioning devices 8 have the same structure and are symmetrically arranged. Now, taking one set of second positioning devices 8 as an example, its structure is described in detail: the second positioning device 8 includes a fourth annular shell 81, a fourth annular piston 82, a hinge rod 83 and a sliding latch 84.

[0050] The fourth annular shell 81 is matchedly mounted on the hollow main shaft 2. The outside of the fourth annular shell 81 is also fixedly connected to the sleeve 11 of the side drum 1 and the fourth annular shell 81 is located at the end of the sleeve 11 away from the tire support mechanism 12. The fourth annular shell 81 can slide on the hollow main shaft 2 together with the sleeve 11.

[0051] An inner cavity is formed at one end of the fourth annular shell 81, and an annular plate 85 is provided at the other end. A plurality of radially arranged guide rails are evenly distributed circumferentially on the side end surface of the annular plate 85. The number of the guide rails is consistent with the number of the sliding pins 84, and the two are installed together in a one-to-one matching manner. Specifically, a sliding groove is formed on each sliding pin 84, and each sliding pin 84 is slidably installed on the corresponding guide rail using its own sliding groove. Each sliding pin 84 is also used in conjunction with a slot 611, wherein the number of the slots 611 is consistent with the number of the sliding pins 84, and a plurality of slots 611 are evenly distributed circumferentially on the inner wall of the end of an anti-wrapped rod base 61.

[0052] The fourth annular piston 82 is a sleeve-like structure with a stepped outer wall. The fourth annular piston 82 is slidably installed on the fourth annular outer shell 81, and the large diameter end of the fourth annular piston 82 divides the inner cavity of the fourth annular outer shell 81 into a fourth left air cavity and a fourth right air cavity. The fourth left air cavity and the fourth right air cavity are both connected to a fourth air pump. The fourth annular piston 82 can be driven to move left and right by filling and discharging air into the fourth left air cavity and the fourth right air cavity through the fourth air pump. The small diameter end of the fourth annular piston 82 passes through the inner cavity of the fourth annular outer shell 81 and extends to one side of the annular plate 85.

[0053] Each sliding latch 84 is also hinged to the small diameter end of the fourth annular piston 82 via a hinged rod 83 , that is, one end of each hinged rod 83 is hinged to a sliding latch 84 , and the other end is hinged to the small diameter end of the fourth annular piston 82 .

[0054] like Figure 7 As shown, when the fourth air pump inflates the fourth right air chamber, the fourth annular piston 82 can be pushed to move to the left, and then the sliding pins 84 are driven to expand and move outward along their corresponding guide rails through a plurality of hinged rods 83, and each sliding pin 84 is inserted into its corresponding slot 611, so as to realize locking between the turn-up rod base 61 and the second positioning device 8, and then realize locking between the turn-up rod group 6 and the sleeve 11; and the positioning of the second positioning device 8 has a self-centering effect, which can ensure that the turn-up rod group 6 always has the same initial position on the corresponding sleeve 11. When the fourth air pump inflates the fourth left air chamber, the fourth annular piston 82 can be pushed to move to the right, and then the sliding pins 84 are driven to retract and move inward along their corresponding guide rails through a plurality of hinged rods 83, and each sliding pin 84 is pulled out from its corresponding slot 611, thereby releasing the lock between the turn-up rod base 61 and the second positioning device 8, and then releasing the lock between the turn-up rod group 6 and the sleeve 11; allowing the turn-up rod group 6 to move relative to the sleeve 11, thereby providing conditions for the turn-up rod group 6 to perform a turn-up operation.

[0055] The working principle of this embodiment is as follows: when working, first install the unvulcanized tire 10 between the two sets of side drums 1 and lock them using the two tire support mechanisms 12, adjust the second positioning device 8 to be in a locked state (that is, the nut 4, connecting key 5, second positioning device 8, side drum 1, locking device 9 and turn-up rod group 6 used in conjunction with each other can be relatively fixed), and the locking device 9 is in an unlocked state (that is, the side drum 1 and the hollow main shaft 2 used in conjunction with each other can be unlocked), the servo motor drives the lead screw 3 to rotate, and then drives the two nuts 4 to move apart and together (that is, the two nuts 4 move toward or away from each other synchronously), and because the second positioning device 8 is in a locked state, the two sets of connecting keys 5 will synchronously drive the two sets of side drums 1 and the two sets of side drums 1 along their respective guide grooves 21. The turn-up rod group 6 moves with the two nuts 4 to adjust the distance between the two tire support mechanisms 12, thereby completing the flatness and width adjustment of the unvulcanized tire 10; then the second positioning device 8 is adjusted to be in an unlocked state, and the locking device 9 is in a locked state, and the servo motor drives the screw 3 to rotate, thereby driving the two nuts 4 to move apart and together. Since the second positioning device 8 is in an unlocked state, the two sets of connecting keys 5 will synchronously drive the two sets of turn-up rod groups 6 to move along their respective guide grooves 21 along the two nuts 4, and each turn-up rod 62 in the two sets of turn-up rod groups 6 will swing along the corresponding turning point on the turn-up rod base 61, and make the turn-up roller 63 roll on both sides of the unvulcanized tire 10, thereby completing the turn-up operation of the unvulcanized tire 10.

[0056] In summary, the content of the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can propose other embodiments within the technical guiding idea of ​​the present invention, but these embodiments are all included in the scope of the present invention.

Claims

1. A single-screw servo turn-up mechanical forming drum, comprising side drums, a hollow main shaft, a screw, a servo motor, a nut, a turn-up rod group, a connecting key and a locking device, wherein the side drums are in two sets and are symmetrically slidably mounted on the hollow main shaft and used to lock the unvulcanized tire, the screw coaxially passes through the interior of the hollow main shaft and is driven to rotate by the servo motor, the nut is in two sets and is symmetrically connected to the two sides of the screw in opposite directions, the turn-up rod group is in two sets and is symmetrically mounted on the two sets of the side drums one by one and is used to realize the turn-up operation of the unvulcanized tire, the connecting key is in two sets and is used to realize the one-to-one connection between the two screw nuts and the two sets of the turn-up rod groups, the locking device is in two sets and is symmetrically installed on the two sets of the side drums one by one and is used to realize the locking between the two sets of the side drums and the hollow main shaft; characterized in that Each of the locking devices comprises a second annular housing, a second annular piston, a second steel ball, a wedge sleeve and a bearing bush; In the same locking device, the second annular shell is matched and slidably sleeved on the hollow main shaft and fixedly connected to a shaft sleeve of the side drum, and an annular opening is also formed on the inner wall of the second annular shell; In the same locking device, the second annular piston is slidably mounted inside the second annular housing and divides the inner cavity of the second annular housing into a second left air cavity and a second right air cavity, the second left air cavity and the second right air cavity are both connected to a second air pump, and a second annular piston conical surface is also formed on the inner wall of the second annular piston; In the same locking device, there are multiple bearing shells which are evenly distributed circumferentially on the outer wall of the hollow main shaft, there are two wedge sleeves, and the two wedge sleeves and the multiple bearing shells are also placed in the annular opening of the second annular shell, and the two wedge sleeves respectively use the inner conical surfaces of the wedge sleeves on their respective inner walls to symmetrically press on the bearing shell conical surfaces on both sides of the outer walls of each bearing shell, a wedge sleeve side conical surface is also formed on one side surface of one of the wedge sleeves, and an annular groove is also formed between the wedge sleeve side conical surface and the side wall of the annular opening; In the same locking device, the second steel balls are multiple and evenly distributed circumferentially between the annular groove and the second annular piston conical surface; In the same locking device, the second annular piston is driven by the second air pump to slide in the second annular shell; the conical surface of the second annular piston is used to squeeze each of the second steel balls to move, and the two wedge sleeves are pushed to jointly squeeze each of the bearing shells to hold the hollow main shaft tightly; or the squeezing of each of the second steel balls is released, and then the squeezing of the two wedge sleeves on the bearing shells is released to loosen the hollow main shaft.

2. The single-screw servo turn-up mechanical forming drum according to claim 1, characterized in that: Each of the locking devices also includes two elastic rubber rings. In the same locking device, a wing plate is provided on the outer side of each bearing shell. The two elastic rubber rings are expanded outward and are arranged on the inner side of the wing plate of each bearing shell to drive each bearing shell to loosen the hollow main shaft when the clamping of the hollow main shaft is released.

3. The single-screw servo turn-up mechanical forming drum according to claim 1, characterized in that: It also includes two sets of symmetrically arranged first positioning devices, each of which is respectively mounted on one of the side drums, and each of which is also respectively connected to one of the turn-up rod groups through the connecting key, and each of which includes a third annular housing, a third annular piston and a third steel ball; In the same first positioning device, the third annular shell is matched and slidably sleeved on a shaft sleeve of the side drum, and a plurality of circular holes are evenly distributed circumferentially on the inner wall of the third annular shell; In the same first positioning device, the third annular piston is slidably mounted inside the third annular housing and divides the inner cavity of the third annular housing into a third left air cavity and a third right air cavity, the third left air cavity and the third right air cavity are both connected to a third air pump, and a third annular piston conical surface is also formed on the inner wall of the third annular piston; In the same first positioning device, the third steel balls are multiple and are installed in the multiple circular holes one by one. The sleeve of each side drum is also circumferentially evenly provided with multiple tapered grooves, and the multiple tapered grooves and the multiple third steel balls are used in a one-to-one correspondence. The multiple third steel balls are also arranged between the conical surface of the third annular piston and the outer wall of the corresponding sleeve or between the conical surface of the third annular piston and each of the tapered grooves. In the same first positioning device, the third annular piston is driven by the third air pump to slide in the third annular shell; the third annular piston conical surface is used to press each of the third steel balls into the corresponding conical groove, so that each of the third steel balls is pressed between the third annular piston conical surface and the corresponding conical groove, so as to lock the first positioning device on the corresponding sleeve, thereby realizing the locking of the sleeve and the corresponding turn-up rod group; or the squeezing of each of the third steel balls is released, and when the first positioning device slides along the corresponding sleeve driven by the corresponding connecting key, each of the third steel balls rolls from the corresponding conical groove to the outer wall of the corresponding sleeve, so that each of the third steel balls is pressed between the third annular piston conical surface and the outer wall of the corresponding sleeve, so as to release the lock between the first positioning device and the corresponding sleeve, thereby releasing the lock between the sleeve and the corresponding turn-up rod group.

4. The single-screw servo turn-up mechanical forming drum according to claim 3, characterized in that: A plurality of support grooves are evenly distributed circumferentially on the outer wall of the third annular shell in each of the first positioning devices. In the same first positioning device, each of the support grooves is used to support each turn-up rod in the corresponding turn-up rod group one by one.

5. The single-screw servo turn-up mechanical forming drum according to claim 1, characterized in that: It also includes two sets of second positioning devices, which are symmetrically mounted on the hollow main shaft, and each of the second positioning devices is also fixedly connected to one of the shaft sleeves, and each of the second positioning devices includes a fourth annular shell, a fourth annular piston, a hinge rod and a sliding latch; In the same second positioning device, the fourth annular shell is matched and slidably mounted on the hollow main shaft, one end of the fourth annular shell is formed with an inner cavity, and the other end is provided with an annular plate, a side end surface of the annular plate is circumferentially evenly provided with a plurality of radially arranged guide rails, each of the guide rails is slidably mounted with a sliding latch, each of the sliding latches is used in conjunction with a slot, wherein a plurality of the slots are circumferentially evenly formed on the inner wall of the end of the turn-up rod base of a turn-up rod group; In the same second positioning device, the fourth annular piston is a sleeve-shaped structure with a stepped outer wall, the fourth annular piston is slidably mounted on the fourth annular shell, and the large-diameter end of the fourth annular piston divides the inner cavity of the fourth annular shell into a fourth left air cavity and a fourth right air cavity, the fourth left air cavity and the fourth right air cavity are both connected to a fourth air pump, and the small-diameter end of the fourth annular piston penetrates the inner cavity of the fourth annular shell and extends to one side of the annular plate; In the same second positioning device, each of the sliding latches is hinged to the small diameter end of the fourth annular piston through a hinge rod; In the same second positioning device, the fourth annular piston is driven by the fourth air pump to slide on the fourth annular shell, so as to drive each sliding pin to move radially along the corresponding guide rail, and then each sliding pin is inserted into the corresponding slot or pulled out from the corresponding slot to achieve locking or unlocking between the turn-up rod group and the corresponding sleeve.

6. The single-screw servo turn-up mechanical forming drum according to claim 1, characterized in that: Each of the side drums comprises a shaft sleeve and a tire support mechanism, and each of the tire support mechanisms comprises a first annular shell, a first annular piston, a connecting rod and a locking block; In the same side drum, the sleeve is matched and slidably mounted on the hollow main shaft; In the same side drum, the first annular shell is fixedly connected to the shaft sleeve, and a guide ring groove is also formed on the outer wall of the first annular shell; In the same side drum, the first annular piston is slidably mounted inside the first annular shell and divides the inner cavity of the first annular shell into a first left air cavity and a first right air cavity, and the first left air cavity and the first right air cavity are both connected to a first air pump; In the same side drum, there are multiple locking blocks which are evenly distributed in the guide ring groove in the circumferential direction, and each locking block is hinged to the first annular piston through a connecting rod; In the same side drum, the first air pump drives the first annular piston to slide in the first annular shell, so as to drive each locking block to perform radial expansion and contraction movement along the guide ring groove, so as to lock or unlock the unvulcanized tire.

7. The single-screw servo turn-up mechanical forming drum according to claim 6, characterized in that: The hollow main shaft and the two shaft sleeves are both provided with guide grooves for the connecting keys to pass through. One end of each connecting key is fixedly connected to the corresponding nut, and the other end is fixedly connected to a turn-up rod base.

8. The single-screw servo turn-up mechanical forming drum according to claim 7, characterized in that: Each of the turn-up rod groups comprises a turn-up rod base and a plurality of turn-up rods uniformly distributed circumferentially around the hollow main shaft. Each of the turn-up rod bases is slidably mounted on the corresponding sleeve in a matching manner. One end of each of the turn-up rods is hinged to the corresponding turn-up rod base, and a turn-up roller is installed on the other end.

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