Tire vulcanization system

Abstract

The utility model relates to a tire vulcanization system, which is used for dual-mode tire vulcanization and comprises a left capsule, a right capsule and a pipeline system, steam inlet ends of the left capsule and the right capsule are respectively connected with a shaping nitrogen inlet pipe, and a communication pipeline is arranged between the steam inlet ends of the left capsule and the right capsule. The communicating pipeline is respectively connected with a high-temperature steam inlet pipe and a high-pressure nitrogen inlet pipe; the discharge ends of the left capsule and the right capsule are respectively connected with a group of discharge pipelines, the two groups of discharge pipelines are mutually independent, and each group of discharge pipelines comprises a main discharge pipeline, a high-pressure nitrogen recovery pipe, a steam condensate discharge pipe and a vacuumizing pipe. According to the scheme, the inlet pipeline and the discharge pipeline are independent, and the discharge pipelines of the left capsule and the right capsule are independent, so that the problems of in-mold temperature difference and single-side capsule bottom can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to tire vulcanization technical field especially relates to a tire vulcanization system. BACKGROUND

[0002] Traditional tire vulcanization mainly adopts steam + nitrogen gas vulcanization process, mainly including the following steps:

[0003] 1. Shaping: opening shaping valve, control shaping nitrogen gas to fill into tire capsule at process pressure, shape to embryo;

[0004] 2. High temperature steam in: opening high temperature steam in valve, control high temperature and high pressure steam to fill into tire capsule, make capsule temperature reach process required temperature;

[0005] 3. High pressure nitrogen gas in: opening high pressure nitrogen gas in valve, control high pressure nitrogen gas to fill into tire capsule, make capsule internal pressure reach process required pressure;

[0006] 4. Nitrogen gas recovery: after vulcanization, opening nitrogen gas recovery valve, recover nitrogen gas;

[0007] 5. Exhaust: opening exhaust valve, exhaust remaining gas and condensate in system;

[0008] 6. Vacuumizing: opening vacuumizing valve, extract inside system to vacuum.

[0009] The pipeline system in vulcanization machine includes multiple gas inlet, exhaust pipeline and multiple electromagnetic valves such as shaping valve, high temperature steam in valve, high pressure nitrogen gas in valve, nitrogen gas recovery valve, exhaust valve and vacuumizing valve set on these pipelines, realize above-mentioned steps through pipeline system cooperation.

[0010] Figure 1The pipe system diagram used in the prior art is used for double mold tire vulcanization, simultaneously controlling left and right active molds and left and right capsules used in cooperation with the left and right active molds. The steam inlet ends of the left and right capsules are respectively connected to one way of shaping nitrogen inlet pipe (about 0.2Mpa), and a first communication pipe is arranged between the steam inlet ends of the left and right capsules. The bottom end of the first communication pipe is respectively connected to one way of high-temperature steam inlet pipe (about temperature 200℃, pressure 1.7Mpa), one way of high-pressure nitrogen inlet pipe (about 2.5Mpa), one way of main exhaust pipe and one way of vacuumizing pipe. A second communication pipe is arranged between the exhaust ends of the left and right capsules, and the bottom end of the second communication pipe is respectively connected to one way of nitrogen recovery pipe, one way of steam condensate exhaust pipe, one way of shaping exhaust pipe and one way of vacuumizing pipe. One way of vacuumizing pipe is arranged on the inlet side and the exhaust side of the above-mentioned pipe respectively, and when the vulcanization ends and proceeds to the vacuumizing step, the inlet side and the exhaust side of the pipe are simultaneously vacuumized to accelerate the vacuumizing speed. One way of main exhaust pipe is arranged on the inlet side and the exhaust side of the pipe respectively to exhaust the remaining gas on the inlet side and the exhaust side. The remaining pipes on the inlet side and the exhaust side are single pipes.

[0011] As shown in Figures 2-4 , the above-mentioned pipe system has the following problems when used for double mold tire vulcanization in actual use:

[0012] Problem 1, the temperature difference between the left and right molds in the high-pressure steam filling stage is greater than 5℃;

[0013] Problem 2, the temperature difference between the left and right molds at the end of vulcanization is greater than 30℃;

[0014] Problem 3, the pressure of the left and right molds cannot be controlled separately in the pressure maintaining stage (the poor pressure maintaining of one side affects the other side);

[0015] Problem 4, the pressure is instantaneously too high during the process from one-time shaping to mold closing (0.03~0.20MPa) and is not controlled;

[0016] Problem 5, there is water accumulation at the lowest point of the single-side inner capsule (the temperature difference between the lowest point of the inner liner in the left and right molds and the surface of the highest point is large, causing the temperature difference between the inner surfaces of the upper and lower tire sides to be large).

[0017] After analysis, the skilled person found that the reasons for the above-mentioned problems are mainly as follows:

[0018] 1, regarding the problems of mold temperature difference and water accumulation at the bottom of the single-side capsule, the left and right molds are only provided with one way of steam condensate exhaust pipe, the lengths of the left and right mold condensate exhaust pipes are different, the condensate exhaust effects and condensate exhaust times of the two capsules are different, and the inner temperature difference is caused (problems 1, 2 and 5).

[0019] 2. Since the communication pipeline is arranged between the discharge ends of the left capsule and the right capsule, if the discharge pipeline of the single-side capsule leaks in the pressure maintaining stage, the other side will leak, and finally the qualified rate of both sides will be affected due to the insufficient pressure maintaining (problem 3). Content of the utility model

[0020] In order to solve the above problems, the utility model aims at providing a tire vulcanization system, which is improved in the pipeline system.

[0021] A tire vulcanization system for double-mode tire vulcanization, comprising a left capsule, a right capsule and a pipeline system, the steam inlet ends of the left capsule and the right capsule are respectively connected with one way of shaping nitrogen inlet pipe, and a communication pipeline is arranged between the steam inlet ends of the left capsule and the right capsule, the communication pipeline is respectively connected with one way of high-temperature steam inlet pipe and one way of high-pressure nitrogen inlet pipe; the discharge ends of the left capsule and the right capsule are respectively connected with one group of discharge pipelines, the two groups of discharge pipelines are independent of each other, and each group of discharge pipelines comprises one way of main discharge pipeline, one way of high-pressure nitrogen recovery pipe, one way of steam condensate discharge pipe and one way of vacuumizing pipe.

[0022] Preferably, each group of discharge pipelines further comprises one way of shaping nitrogen discharge pipe, and the shaping nitrogen discharge pipe is provided with a shaping nitrogen discharge valve.

[0023] Preferably, the nitrogen pressure maintaining valve is arranged on the confluence section of the capsule to which all the pipelines in each group of discharge pipelines are connected.

[0024] Preferably, the orifice diameter of the throttle orifice plate on the steam condensate discharge pipeline is 3-5 mm.

[0025] The above scheme separates the inlet pipeline and the discharge pipeline, and separates the discharge pipelines of the left capsule and the right capsule. On the one hand, the discharge pipelines of the two-side capsules are independent, which can avoid the problems caused by the inconsistent pipeline length due to the shared pipeline in the condensate discharge stage, can ensure that the condensate discharge effects of the two-side capsules are the same, and solves the problems of in-mold temperature difference and single-side capsule bottom. Moreover, the two-side discharge pipelines are independent of each other, so that even if the pipeline of the single-side capsule leaks in the pressure maintaining stage, the qualified rate of the other-side capsule will not be affected. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the pipeline system of the vulcanization machine in the prior art;

[0027] Figure 2 It is one of the schematic diagrams for problem analysis in the prior art;

[0028] Figure 3 It is the second of the schematic diagrams for problem analysis in the prior art;

[0029] Figure 4 It is the third of the schematic diagrams for problem analysis in the prior art;

[0030] Figure 5 A schematic diagram of the pipeline system of the present application is shown in Figure 1.

[0031] Figure 6 A comparison diagram of the curing curve of the prior art is shown in Figure 2.

[0032] Figure 7 A comparison diagram of the shaping pressure curve of the prior art is shown in Figure 3.

[0033] Figure 8 A comparison diagram of the improvement of the problem of large amount of water accumulation on one side of the tire side of the prior art is shown in Figure 4.

[0034] Figure 9 A verification diagram of the bubble cutting test for the problem of large amount of water accumulation on one side of the tire side is shown in Figure 5.

[0035] Figure 10 A comparison diagram of the temperature rising time of the orifice plate with a hole diameter of 3mm, 4mm and 5mm in the pipeline system of the present embodiment is shown in Figure 6.

[0036] The figure shows: left capsule 1, right capsule 2, shaping nitrogen inlet pipe 31, communication pipeline 32, high-temperature steam inlet pipe 33, high-pressure nitrogen inlet pipe 34, main discharge pipeline 41, high-pressure nitrogen recovery pipe 42, steam condensate discharge pipe 43, vacuumizing pipe 44, shaping nitrogen discharge pipe 45, nitrogen shaping balance valve 5, orifice plate 6. DETAILED DESCRIPTION

[0037] The embodiments of the present application will be described in detail below.

[0038] The present embodiment provides a tire vulcanization system, which comprises a left capsule 1, a right capsule 2 and a pipeline system. Figure 5 As shown in the figure, the steam inlet ends of the left capsule 1 and the right capsule 2 are respectively connected to a shaping nitrogen inlet pipe 31, and a communication pipeline 32 is arranged between the steam inlet ends of the left capsule 1 and the right capsule 2, and the communication pipeline 32 is respectively connected to a high-temperature steam inlet pipe 33 and a high-pressure nitrogen inlet pipe 34; the discharge ends of the left capsule 1 and the right capsule 2 are respectively connected to a group of discharge pipelines, and the two groups of discharge pipelines are independent of each other, and each group of discharge pipelines comprises a main discharge pipeline 41, a high-pressure nitrogen recovery pipe 42, a steam condensate discharge pipe 43 and a vacuumizing pipe 44.

[0039] The present embodiment mainly improves the pipeline system, and separates the inlet pipeline and the discharge pipeline, and separates the discharge pipelines of the left capsule 1 and the right capsule 2. On the one hand, the discharge pipelines of the two capsules are independent, which can avoid the problem of inconsistent pipeline length caused by sharing the pipeline during the condensate discharge stage, and can ensure that the condensate discharge effects of the two capsules are the same, and solve the problem of in-mold temperature difference and single-side capsule bottom. Moreover, the two discharge pipelines are independent of each other, and even if the pipeline of the single-side capsule leaks during the pressure maintaining stage, it will not affect the qualification rate of the other capsule.

[0040] In this embodiment, a nitrogen pressure-maintaining valve is installed at the manifold of all pipes connecting to the capsule in each group of discharge pipes. Installing the nitrogen pressure-maintaining valve at this location further ensures the pressure-maintaining effect of the capsule discharge pipes on both sides.

[0041] like Figure 5 As shown, in this embodiment, a high-temperature steam inlet valve is provided on the high-temperature steam inlet pipe 33, a steam condensation valve is provided on the steam condensation outlet pipe 43, a nitrogen inlet valve is provided on the high-pressure nitrogen inlet pipe 34, and a nitrogen pressure-maintaining valve is provided at the junction of the outlet pipes. A medium switching valve is provided on the connecting pipe 32 of the high-temperature steam inlet pipe 33 and the high-pressure nitrogen inlet pipe. The medium switching valve switches between the high-temperature steam inlet valve and the nitrogen inlet valve to allow either high-temperature steam or high-pressure nitrogen to enter the capsules on both sides. A main outlet valve is provided on the main outlet pipe, a vacuum valve is provided on the vacuum pipe 44, a nitrogen recovery valve is provided on the high-pressure nitrogen recovery pipe 42, and a nitrogen shaping balance valve 5 is provided on the shaping nitrogen inlet pipe 31. The controller in the vulcanization system controls the opening and closing states of the solenoid valves on each pipeline to achieve the entry and exit of the medium into the left and right capsules at each stage.

[0042] like Figures 6-9 It can be seen that the dual-row pipeline of this embodiment has significant improvements over the pipeline system scheme in the prior art in the following aspects: Improvement 1: Temperature difference between the left and right molds during the high-pressure steam filling stage < 5℃; Improvement 2: Temperature difference between the left and right molds after vulcanization < 30℃; Improvement 3: Pressure of the left and right molds is individually controlled during the pressure holding stage (without mutual interference); Improvement 4: Pressure is controlled from the moment of initial shaping to the moment of mold closing (0.03~0.10MPa); Improvement 5: No water accumulation at the bottom of the bladder (small temperature difference between the upper and lower surfaces of the inner lining layer on the sidewall of the left and right molds). Referring to the experimental results in Table 1 below, it can be seen that using the pipeline system of this application significantly reduces the incidence of problems such as low high-pressure steam filling temperature, inconsistent initial pressure holding, uneven tire lining, reduced vulcanization cycles, and process non-compliance rate.

[0043]

[0044] Table 1. Comparison Test Results of Problem Occurrence Rate Based on F30# Model

[0045] In the prior art, the orifice diameter of the throttling plate used in a single-path condensate drain pipe is 7mm. In this embodiment, after dividing into a dual-path condensate drain pipe, the orifice diameter of the orifice plate 6 on the steam condensate drain pipe 43 is 4mm. The dual-path condensate drain orifice Φ4 is combined into the single-path condensate drain orifice diameter calculation:

[0046] πR² = 2πr², where r is the radius of one of the two condensate drain holes in the dual-path condensate drain pipe, r = 2 mm, and R is the radius after merging into the single-path condensate drain hole.

[0047] It can be concluded that after being merged into a single channel, it is equivalent to a single channel condensate discharge hole with an orifice diameter of Φ5.656, which is 7mm smaller than the orifice diameter of the throttling plate in the prior art, thereby reducing the loss of high-temperature steam.

[0048] Theoretical calculations show the following savings in high-temperature steam:

[0049] When the single-row condenser hole Φ7 is changed to a double-row condenser hole Φ4, the steam saving is 12.9 kg / H·unit - 8.4 kg / H·unit = 4.5 kg / H·unit;

[0050] When the double-row condenser holes with diameter Φ3 are modified, steam savings of 12.9 kg / H·unit - 4.7 kg / H·unit = 8.2 kg / H·unit are achieved.

[0051] Based on the above calculations, although setting the orifice plate 6 on the steam exhaust pipe 43 with a diameter of 3mm would be more energy-efficient, if... Figure 10 As shown, for the F03# vulcanizing machine, the heating time of the orifice plate 6 on the steam exhaust pipe 43 with orifice diameters of 3mm, 4mm, and 5mm is about 30 seconds slower with orifice diameter of 3mm than with orifice diameter of 4mm under the same conditions. Therefore, although orifice diameters between 3 and 5mm can balance energy saving and heating time, orifice diameter of 4mm is optimal.

[0052] In this embodiment, the vulcanization system includes a shaping nitrogen discharge pipe 45 in each set of discharge pipelines, and a shaping nitrogen discharge valve is installed on the shaping nitrogen discharge pipe 45. After the shaping nitrogen discharge valve is installed, the control method shown in Embodiment 1 is used to control each capsule.

[0053] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A tire vulcanization system for dual-mode tire vulcanization, comprising a left bladder, a right bladder, and a piping system, characterized in that, The left and right capsules are each connected to a shaped nitrogen inlet pipe, and a connecting pipe is provided between the left and right capsules. The connecting pipe is connected to a high-temperature steam inlet pipe and a high-pressure nitrogen inlet pipe, respectively. The left and right capsules are each connected to a set of discharge pipes. The two sets of discharge pipes are independent of each other. Each set of discharge pipes includes a main discharge pipe, a high-pressure nitrogen recovery pipe, a steam condensate discharge pipe, and a vacuum pipe.

2. The tire vulcanization system according to claim 1, characterized in that, Each set of discharge pipelines also includes a shaped nitrogen discharge pipe, which is equipped with a shaped nitrogen discharge valve.

3. The tire vulcanization system according to claim 1, characterized in that, Each set of discharge pipelines is equipped with a nitrogen pressure-maintaining valve at the manifold section connecting all pipelines to the capsule.

4. A tire vulcanization system according to claim 1, characterized in that, The orifice diameter on the throttling orifice plate of the steam exhaust pipe is 3-5mm.

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