Pneumatic rotary valve independent device of giant tire forming machine

Abstract

The invention discloses a pneumatic rotary valve independent device of a giant tire forming machine, which comprises a main shaft, a coaxial annular air chamber is arranged in a shaft body of the main shaft, a rotary valve group which is arranged on a left bracket and a right bracket and is coaxial with the main shaft is arranged, and the rotary valve group comprises a plurality of rotary valves which are tightly arranged left and right along the axial direction; each rotary valve is provided with one or a left pipe joint and a right pipe joint; a steel sleeve is installed between the rotary valve set and the main shaft in a matched mode, the steel sleeve and the main shaft are fixedly connected through a key, and the steel sleeve and the rotary valve set are rotationally connected through a left bearing and a right bearing. And each pipe joint is communicated with the annular air chamber through each rotary valve, the steel sleeve and an air passage correspondingly formed in the main shaft. According to the structure, the steel sleeve is installed on the main shaft and rotates along with the main shaft, the rotary valve sealing ring makes contact with the steel sleeve, and the steel sleeve can be replaced after abrasion; multiple sets of standby sealing ring grooves are designed in the rotary valve, the positions of sealing rings can be replaced after abrasion, and the service life of the steel sleeve is prolonged.

Description

Technical Field

[0001] The invention relates to a component structure of a tire building machine, in particular to an independent pneumatic rotary valve device for a giant tire building machine. Background Art

[0002] The pneumatic rotary valve of the existing giant tire building machine is used to connect high-pressure gas to the rotating main shaft to realize various drum movements. To prevent the high-pressure gas from leaking between the rotary valve and the main shaft, the sealing ring inside the rotary valve is directly installed on the main shaft. After long-term operation and friction, grooves will form on the shaft body of the main shaft, causing air leakage. The replacement of the main shaft is expensive and the cycle is long. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention proposes an independent pneumatic rotary valve device for a giant tire building machine, which protects the main shaft from wear.

[0004] The pneumatic rotary valve independent device for giant tire building machine can solve the existing technical problems. Its technical solution includes a main shaft, and a coaxial annular air chamber is opened in the shaft body of the main shaft. The difference is:

[0005] 1. A rotary valve group is coaxially provided with the main shaft and is installed on the left and right brackets. The rotary valve group includes multiple rotary valves closely arranged on the left and right sides along the axial direction. Each rotary valve is provided with one or two pipe joints on the left and right sides.

[0006] 2. A steel sleeve is installed between the rotary valve group and the main shaft. The steel sleeve and the main shaft are fixedly connected by a key, and the steel sleeve and the rotary valve group are rotatably connected by left and right bearings.

[0007] 3. Each pipe joint is connected to the annular air chamber through each rotary valve, steel sleeve and the corresponding air passage opened inside the main shaft.

[0008] Furthermore, a structure of each air channel includes an annular air groove opened on the inner wall of each rotary valve, and a through hole I and a through hole II opened in the same radial direction on the main shaft and the steel sleeve.

[0009] In order to further improve the sealing performance, a dynamic sealing assembly is provided between the rotary valve and the steel sleeve on the left and right sides of each annular air groove; a static sealing assembly is provided between the rotary valve and the steel sleeve on the left and right sides of each through hole.

[0010] In order to further increase the service life of the steel sleeve, one structure of the dynamic sealing assembly includes a dynamic sealing ring and two or more left and right dynamic sealing grooves opened on the inner hole of the rotary valve. The dynamic sealing ring is installed in one dynamic sealing groove, and the remaining dynamic sealing grooves are used as spares; one structure of the static sealing assembly includes a static sealing ring installed in the static sealing groove, and the static sealing groove is opened on the shaft body of the main shaft.

[0011] Furthermore, the multiple rotary valves are axially tightened by tie rod assemblies that are evenly distributed around the circumference.

[0012] Beneficial effects of the present invention:

[0013] 1. In the structure of the independent pneumatic rotary valve device of the giant tire building machine of the present invention, a steel sleeve is installed between the main shaft and the rotary valve group. The steel sleeve rotates with the main shaft, and the dynamic sealing ring of the rotary valve contacts the steel sleeve. When the passive sealing ring of the steel sleeve is worn, the steel sleeve can be replaced, thereby protecting the main shaft from wear.

[0014] 2. In the structure of the present invention, multiple dynamic sealing rings (one for main use and the rest for backup) can be designed in each rotary valve. When one sealing position of the steel sleeve is worn out, the dynamic sealing ring can be replaced at another position and the steel sleeve can continue to be used, thereby extending the service life of the steel sleeve.

[0015] 3. The structure of the present invention is simple and reliable, with low manufacturing cost, convenient installation and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of an embodiment of the present invention.

[0017] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0018] Figure number identification: 1. Main shaft; 1-1. Annular air chamber; 1-2. Center shaft hole; 2. Rotary valve; 2-1. Dynamic sealing groove; 3. Pipe joint; 4. Steel sleeve; 5. Static sealing ring; 6. Dynamic sealing ring; 7. Air duct; 7-1. Annular air groove; 7-2. Through hole I; 7-3. Through hole II; 8. Bracket; 9. Key; 10. Bearing; 11. Pull rod assembly. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0020] The pneumatic rotary valve independent device of the giant tire building machine of the present invention comprises a steel sleeve 4 and a rotary valve group arranged based on the main shaft 1 of the building machine. The main shaft 1 is provided with a central shaft hole 1-2 and an annular air chamber 1-1 coaxial from the inside to the outside. Figure 1 shown.

[0021] The rotary valve group is coaxially sleeved on a section of the main shaft 1, and the rotary valve group includes four coaxial rotary valves 2 that can work independently. The four rotary valves 2 are tightly arranged in the left and right directions to form a whole and are axially locked by multiple tie rod assemblies 11 evenly distributed around the circumference. The two rotary valves 2 on the left and right are fixedly installed on the left and right brackets 8. The left and right brackets 8 are installed on the main box of the molding machine. Each rotary valve 2 is installed with two radially arranged left and right pipe joints 3. Corresponding to each pipe joint 3, a coaxial annular air groove 7-1 is opened on the valve hole of each rotary valve 2. Each annular air groove 7-1 is connected to the radial pipe hole of the corresponding pipe joint 3, such as Figure 1 shown.

[0022] The steel sleeve 4 is coaxially arranged between the rotary valve group and the main shaft 1. The steel sleeve 4 and the main shaft 1 are fixedly connected by a (flat) key 9. The steel sleeve 4 and the rotary valve group are rotatably connected by left and right bearings 10. That is, the main shaft 1 drives the steel sleeve 4 to rotate in the valve hole of the rotary valve group. Corresponding to each pipe joint 3, a connected through hole I7-2 and a through hole II7-3 are opened on the main shaft 1 and the steel sleeve 4 in the same radial direction. The through hole I7-2 and the through hole II7-3 are connected to the annular air chamber 1-1 and the annular air groove 7-1 respectively. That is, each pipe joint 3 is connected to the annular air chamber 1-1 through the air channel 7 formed by the annular air groove 7-1, the through hole I7-2 and the through hole II7-3. Figure 1 、 Figure 2 shown.

[0023] Static sealing components are provided between the steel sleeves 4 on the left and right sides of each through hole and the main shaft 1. The static sealing components include static sealing rings 5. Each static sealing ring 5 is provided in a static sealing groove corresponding to the shaft body of the main shaft 1. Figure 1 、 Figure 2 shown.

[0024] Two left and right dynamic sealing grooves 2-1 are provided on the valve holes of the rotary valves 2 on the left and right sides of each annular air chamber 1-1. A dynamic sealing ring 6 is provided in one dynamic sealing groove 2-1 to seal on the steel sleeve 4 to form a dynamic sealing assembly. The other dynamic sealing groove 2-1 is used as a spare. When the steel sleeve 4 at the position where the dynamic sealing ring 6 is located is worn out, a dynamic sealing ring 6 can be provided in the spare dynamic sealing groove 2-1 to form a new dynamic sealing assembly, so that the steel sleeve 4 can continue to be used, thereby extending the service life of the steel sleeve 4. Figure 1 、 Figure 2 shown.

[0025] The operation mode of the present invention is:

[0026] The central axis hole 1-2 of the main shaft 1 is keyed to a rotating shaft. Driven by the rotating shaft, the steel sleeve 4 and the main shaft 1 rotate, and the two pipe joints 3 on each rotary valve 2 are connected to the high-pressure gas. The high-pressure gas enters the annular air chamber 1-1 through multiple air channels 7 composed of the pipe joints 3, the annular gas groove 7-1, the through hole I 7-2 and the through hole II 7-3, thereby achieving the purpose of connecting the high-pressure gas to the rotating main shaft 1.

Claims

1. A pneumatic rotary valve independent device for a giant tire building machine, comprising a main shaft (1), wherein a coaxial annular air chamber (1-1) is provided in the shaft body of the main shaft (1), characterized in that: A rotary valve group is coaxially provided with the main shaft (1) and is mounted on left and right brackets (8). The rotary valve group includes a plurality of rotary valves (2) closely arranged on the left and right sides along the axial direction. Each rotary valve (2) is provided with one or two pipe joints (3) on the left and right sides. A steel sleeve (4) is fitted between the rotary valve assembly and the main shaft (1), the steel sleeve (4) and the main shaft (1) are fixedly connected via a key (9), and the steel sleeve (4) and the rotary valve assembly are rotatably connected via left and right bearings (10); Each pipe joint (3) is connected to the annular air chamber (1-1) through each rotary valve (2), the steel sleeve (4) and the corresponding air passage (7) opened inside the main shaft (1).

2. The pneumatic rotary valve independent device for a giant tire building machine according to claim 1, characterized in that: Each air channel (7) comprises an annular air groove (7-1) opened on the inner wall of each rotary valve (2), and a through hole I (7-2) and a through hole II (7-3) opened in the same radial direction on the main shaft (1) and the steel sleeve (4).

3. The pneumatic rotary valve independent device for a giant tire building machine according to claim 2, characterized in that: A dynamic sealing assembly is provided between the rotary valve (2) and the steel sleeve (4) on the left and right sides of each annular air groove (7-1); and a static sealing assembly is provided between the rotary valve (2) and the steel sleeve (4) on the left and right sides of each through hole.

4. The pneumatic rotary valve independent device for a giant tire building machine according to claim 3, characterized in that: The dynamic sealing assembly comprises a dynamic sealing ring (6) and two or more left and right dynamic sealing grooves (2-1) formed on the inner hole of the rotary valve (2); the dynamic sealing ring (6) is fitted in one of the dynamic sealing grooves (2-1), while the remaining dynamic sealing grooves (2-1) serve as backup. The static seal assembly comprises a static seal ring (5) fitted in a static seal groove, wherein the static seal groove is provided on the shaft body of the main shaft (1).

5. The pneumatic rotary valve independent device for a giant tire building machine according to any one of claims 1 to 4, characterized in that: The plurality of rotary valves (2) are axially tightened by pull rod assemblies (11) uniformly distributed around the circumference.

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