Electric heating device for nitrogen gas in tire vulcanizing machine

Abstract

The utility model relates to a kind of tire vulcanizing machine inner temperature nitrogen electric heating device, including the center mechanism of tire vulcanizing machine, the center mechanism includes upper chuck, lower chuck and annular sealing seat, lower chuck is connected with nitrogen inlet pipe and nitrogen outlet pipe, the annular sealing seat inside is equipped with the annular gas distribution chamber that is communicated with nitrogen inlet pipe, annular sealing seat upper outer circumferential side is equipped with several upper air injection hole spaced distribution and with annular gas distribution chamber communication, annular sealing seat upper portion rotationally connected with the shunt turbine located in the periphery of upper air injection hole, annular sealing seat lower portion is equipped with electric heating coil pipe outside sleeve.The utility model tire vulcanizing machine inner temperature nitrogen electric heating device structure is novel, and it is reasonable in design, and practicality is strong, with heating speed fast, heating efficiency is high, energy-saving and other advantages, accelerate the heating speed of vulcanization inner cavity, improve the vulcanization efficiency, guarantee vulcanization quality.

Description

Technical Field

[0001] This utility model relates to the field of tire vulcanizing machines, and in particular to a nitrogen electric heating device for the internal temperature of a tire vulcanizing machine. Background Technology

[0002] The vulcanization processes of tires require heating at both the inner and outer temperatures. The inner temperature is particularly important, as it's where the vulcanizing medium heats and pressurizes the tire blank through the vulcanizing bladder. Currently, tire vulcanizing machines use a steam-nitrogen heating method for both internal temperature and pressure. This method inevitably increases fuel consumption and the need for steam boilers, resulting in high investment, high labor costs, high energy consumption, and low utilization. Many tire manufacturers are now adopting a pure nitrogen electric heating vulcanization process. However, in tire factory trials and production, the following problems have arisen: nitrogen is supplied from the main power line to the electric heating pressure vessel for electric heating, and then the heated nitrogen is directly supplied to the vulcanizing bladder through the central mechanism of the tire vulcanizing mold (this is a single-stage nitrogen electric heating vulcanization method). This heating method has the following problems: the temperature of the heated nitrogen delivered to the vulcanizing bladder is unstable and drops significantly; the inner temperature rises slowly, and there is a large temperature difference between the top and bottom. These problems affect the quality of tire vulcanization and increase energy consumption. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a nitrogen electric heating device for a tire vulcanizing machine, which accelerates the heating rate of the vulcanizing capsule cavity, ensures uniform temperature and small temperature difference, improves vulcanization efficiency, and guarantees vulcanization quality.

[0004] This utility model is achieved by the following scheme: a nitrogen electric heating device for a tire vulcanizing machine, comprising a central mechanism of the tire vulcanizing machine, the central mechanism comprising an upper clamping plate, a lower clamping plate and an annular sealing seat, the lower clamping plate being connected to a nitrogen inlet pipe and a nitrogen outlet pipe, the annular sealing seat having an annular gas distribution chamber communicating with the nitrogen inlet pipe inside, the upper outer periphery of the annular sealing seat having a plurality of upper jet holes spaced circumferentially and communicating with the annular gas distribution chamber, the upper part of the annular sealing seat being rotatably connected to a flow-dividing turbine located around the upper jet holes, and the lower part of the annular sealing seat being fitted with an electric heating coil.

[0005] Furthermore, the annular sealing seat has an annular plate located between the split turbine and the electric heating coil on its upper part, and the annular plate has several lower jet holes that are circumferentially spaced and communicate with the annular air distribution chamber on its outer periphery.

[0006] Furthermore, the upper jet nozzle has a jet angle of 25° to 35° with the tangent direction in the circumferential direction; the lower jet nozzle has a jet angle of 50° to 60° with the tangent direction in the circumferential direction.

[0007] Furthermore, the upper air jet holes are divided into three groups in the vertical direction with different angles to the horizontal direction, and are alternately distributed along the circumference of the annular sealing seat. The first group is obliquely upward, the second group is set horizontally, and the third group is obliquely downward.

[0008] Furthermore, the lower clamp is provided with a nitrogen recovery port; the electric heating coil is multi-layered spiral.

[0009] Furthermore, a barrier plate is provided between two adjacent layers of the electric heating coil, and the outer edge of the barrier plate extends out of the outer side of the electric heating coil.

[0010] Furthermore, it also includes an electrically heated pressure vessel and a nitrogen recovery and vacuuming device. The outlet of the electrically heated pressure vessel is connected to the nitrogen inlet pipe via a nitrogen supply pipe. The nitrogen outlet pipe is connected to the nitrogen recovery and vacuuming device via a nitrogen return pipe A. The nitrogen recovery and vacuuming device is connected to the inlet of the electrically heated pressure vessel via a nitrogen return pipe B.

[0011] Furthermore, the nitrogen recovery vacuum device includes a piston cylinder and a reciprocating hydraulic cylinder for driving the piston cylinder. The front port and rear tongue of the piston cylinder are respectively connected to the nitrogen return pipe A through a nitrogen return branch pipe A. A one-way valve A is provided on the nitrogen return branch pipe A to control the gas to enter the piston cylinder in only one direction. The front port and rear tongue of the piston cylinder are respectively connected to the nitrogen return pipe B through a nitrogen return branch pipe B. A one-way valve B is provided on the nitrogen return branch pipe B to control the gas to flow out of the piston cylinder in only one direction.

[0012] Furthermore, the piston cylinder is a double piston rod cylinder, and the reciprocating cylinder is a double piston rod cylinder. The two ends of the piston rod of the reciprocating cylinder are connected to the two ends of the piston rod of the piston cylinder through connecting plates.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The internal temperature nitrogen electric heating device of the tire vulcanizing machine of the present invention has a novel structure, reasonable design, and strong practicality. It has the advantages of fast heating speed, high heating efficiency, and energy saving. It accelerates the heating speed of the vulcanizing capsule cavity, with uniform temperature and small temperature difference, thereby improving vulcanization efficiency and ensuring vulcanization quality.

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this utility model;

[0016] Figure 2 This is a partial structural diagram of the central mechanism in an embodiment of this utility model;

[0017] Figure 3 yes Figure 2 Sectional view of AA;

[0018] Figure 4 yes Figure 2 BB section view;

[0019] Figure 5 yes Figure 2 CC section view;

[0020] Figure 6 This is a schematic diagram of the nitrogen recovery vacuum device according to an embodiment of this utility model;

[0021] The following are the labels in the diagram: 100-Tire vulcanizing mold, 200-Central mechanism, 210-Upper clamping plate, 220-Lower clamping plate, 221-Nitrogen recovery port, 230-Annular sealing seat, 231-Annular gas distribution chamber, 232-Upper jet hole, 233-Annular plate, 234-Lower jet hole, 240-Nitrogen inlet pipe, 250-Nitrogen outlet pipe, 260-Diverter turbine, 270-Electric heating coil, 280-Blocking plate, 300-Electric heating pressure vessel, 400-Nitrogen recovery vacuum device, 410-Piston cylinder, 420-Reciprocating cylinder, 430-Nitrogen return branch pipe A, 440-One-way valve A, 450-Nitrogen return branch pipe B, 460-One-way valve B, 470-Connecting plate. Detailed Implementation

[0022] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] like Figures 1-6As shown, a nitrogen electric heating device for a tire vulcanizing machine includes a central mechanism 200 of a tire vulcanizing mold 100. The central mechanism includes an upper clamping plate 210, a lower clamping plate 220, and an annular sealing seat 230. The lower clamping plate is connected to a nitrogen inlet pipe 240 and a nitrogen outlet pipe 250. The annular sealing seat has an annular gas distribution chamber 231 that communicates with the nitrogen inlet pipe. The upper outer periphery of the annular sealing seat has several upper air jet holes 232 that are circumferentially spaced and communicate with the annular gas distribution chamber. The upper part of the annular sealing seat is rotatably connected to a split turbine 260 located around the upper air jet holes. The lower part of the annular sealing seat is covered with an electric heating coil 270.

[0025] In this embodiment, the split turbine 260 includes an annular base plate rotatably connected to the upper end of the annular sealing seat by ball bearings. The annular base plate is rotatably connected above the upper jet hole 232. Several guide vanes are spaced apart on the lower side of the annular base plate, with the positions of the guide vanes corresponding to the upper jet hole 232. The split turbine 260 rotates flexibly with very low rotational resistance and minimal nitrogen pressure loss. Employing a passive turbine split structure, heated nitrogen is injected onto the guide vanes of the split turbine 260. The split turbine 260 rotates automatically under the pressure of the nitrogen, ensuring that the heated nitrogen can be rapidly and evenly ejected within the vulcanizing capsule. This results in a rapid and uniform temperature rise within the vulcanizing cavity, both vertically and horizontally, with minimal temperature difference. This significantly accelerates the heating rate of the cavity and improves vulcanization efficiency.

[0026] In this embodiment, the upper part of the annular sealing seat is provided with an annular plate 233 located between the split turbine and the electric heating coil. The outer periphery of the annular plate is provided with a number of lower jet holes 234 that are distributed circumferentially and communicate with the annular air distribution chamber. A row of lower jet holes is provided below the upper jet holes, so that the injection area is expanded upward and the temperature and pressure difference between the upper and lower parts are more uniform.

[0027] In this embodiment, the upper jet nozzle sprays at an angle of 25° to 35° with the tangent in the circumferential direction, causing the nitrogen gas in the inner cavity to tumble and rotate; the lower jet nozzle sprays at an angle of 50° to 60° with the tangent in the circumferential direction.

[0028] In this embodiment, the upper jet nozzles are arranged in three groups at different angles to the horizontal in the vertical direction, alternating along the circumference of the annular sealing seat. The first group is angled upwards at a 30° angle to the horizontal; the second group is horizontal; and the third group is angled downwards at a 30° angle to the horizontal. The upper jet nozzles have three spray angles (upper, middle, and lower), ensuring that all three parts of the tire are sprayed. This ensures that the heated nitrogen gas is evenly ejected from the nozzles, resulting in rapid temperature rise, long heat retention time, uniform temperature and small temperature difference within the vulcanizing bladder, high heat transfer efficiency, and guaranteed vulcanization quality.

[0029] In this embodiment, the lower clamp is provided with a nitrogen recovery port 221, and the lower clamp is provided with an annular gas distribution chamber connecting the annular sealing seat and the nitrogen inlet pipe, as well as an outlet channel connecting the nitrogen recovery port 221 and the nitrogen outlet pipe; the electric heating coil is multi-layered spiral; at the same time, the electric heating coil is also a double-layer structure. The spiral electric heating tube structure greatly improves the overlap and efficiency of the heating nitrogen flow channels, and its advantages are small heating volume, high heating efficiency, and good heat conduction efficiency.

[0030] In this embodiment, a baffle plate 280 is provided between two adjacent layers of the electric heating coil. The outer edge of the baffle plate extends beyond the outer surface of the electric heating coil, and the baffle plate 280 is made of a heat-insulating material with high temperature resistance and low heat transfer efficiency. Because the electric heating coil has a very high temperature, when the vulcanizing capsule is evacuated, the vulcanizing capsule may approach or touch the electric heating coil, which would damage the vulcanizing capsule and reduce its lifespan. Therefore, by adding a high-temperature resistant, low-heat-transfer-efficiency baffle plate 280 to the heating spiral tube, the vulcanizing capsule is prevented from contacting the electric heating coil (it can only contact the baffle plate), reducing damage to the vulcanizing capsule and greatly extending its service life.

[0031] In this embodiment, an electrically heated pressure vessel 300 and a nitrogen recovery and vacuum device 400 are also included. The outlet of the electrically heated pressure vessel is connected to a nitrogen inlet pipe via a nitrogen supply pipe. The nitrogen outlet pipe is connected to the nitrogen recovery and vacuum device via a nitrogen return pipe A. The nitrogen recovery and vacuum device is connected to the inlet of the electrically heated pressure vessel via a nitrogen return pipe B. A two-stage internal temperature nitrogen electrically heated vulcanization process is adopted. Nitrogen is first heated once by the electrically heated pressure vessel 300 and then enters the vulcanization capsule for secondary heating using the electrically heated coil 270.

[0032] In this embodiment, the nitrogen recovery vacuum device 400 includes a piston cylinder 410 and a reciprocating hydraulic cylinder 420 for driving the piston cylinder. The front port and rear tongue of the piston cylinder are respectively connected to the nitrogen return pipe A through a nitrogen return branch pipe A430. A one-way valve A440 is provided on the nitrogen return branch pipe A to control the gas to enter the piston cylinder in only one direction. The front port and rear tongue of the piston cylinder are respectively connected to the nitrogen return pipe B through a nitrogen return branch pipe B450. A one-way valve B460 is provided on the nitrogen return branch pipe B to control the gas to flow out of the piston cylinder in only one direction.

[0033] A nitrogen recovery and vacuuming device (functioning similarly to a vacuum pump to extract nitrogen from the vulcanizing capsule) has been added. Its simple structure and easy installation improve nitrogen recovery rate and reduce the need for a separate vacuuming device in the main production power line. Firstly, it recovers nitrogen, significantly increasing its reuse rate and reducing production costs. Secondly, it functions as a vacuuming device, eliminating the need for a separate vacuuming pipeline in the main line, reducing auxiliary vulcanization time and improving production efficiency. Thirdly, the nitrogen recovery and vacuuming device accelerates nitrogen circulation within the vulcanizing capsule, rapidly increasing the nitrogen heating rate and shortening the nitrogen vulcanization heating time, thus improving vulcanization productivity and saving energy. The nitrogen recovery and vacuuming device uses a reciprocating hydraulic cylinder to drive a piston cylinder to recover nitrogen and vacuum the vulcanizing capsule. Its reciprocating speed depends on the pressure of the recovered nitrogen and the vacuum level within the capsule, ensuring high recovery speed, high utilization rate, and high vacuum level. The recovery rate reaches approximately 60%-70%, and the vacuum level can reach approximately 0.2-0.25, shortening the nitrogen vulcanization heating time by about 15%.

[0034] In this embodiment, the piston cylinder is a double piston rod cylinder, and the reciprocating cylinder is a double piston rod cylinder. The two ends of the piston rod of the reciprocating cylinder are connected to the two ends of the piston rod of the piston cylinder through a connecting plate 470.

[0035] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0036] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by integral molding using a casting process) (except where it is obviously impossible to use an integral molding process).

[0037] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0038] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A nitrogen electric heating device for a tire vulcanizing machine, comprising a central mechanism of the tire vulcanizing machine, the central mechanism including an upper clamping plate, a lower clamping plate, and an annular sealing seat, the lower clamping plate being connected to a nitrogen inlet pipe and a nitrogen outlet pipe, characterized in that: The annular sealing seat has an annular gas distribution chamber inside that communicates with the nitrogen inlet pipe. The upper outer periphery of the annular sealing seat has several upper jet holes that are spaced apart circumferentially and communicate with the annular gas distribution chamber. The upper part of the annular sealing seat is rotatably connected to a split turbine located around the upper jet holes. The lower part of the annular sealing seat is covered with an electric heating coil.

2. The nitrogen electric heating device for the tire vulcanizing machine according to claim 1, characterized in that: The annular sealing seat has an annular plate located between the split turbine and the electric heating coil on its upper part. The outer periphery of the annular plate has several lower jet holes that are circumferentially spaced and communicate with the annular air distribution chamber.

3. The nitrogen electric heating device for the tire vulcanizing machine according to claim 2, characterized in that: The upper jet nozzle sprays at an angle of 25° to 35° with the tangent in the circumferential direction; the lower jet nozzle sprays at an angle of 50° to 60° with the tangent in the circumferential direction.

4. The nitrogen electric heating device for the tire vulcanizing machine according to claim 1, characterized in that: The upper air jet holes are divided into three groups in the vertical direction with different angles to the horizontal direction, and are alternately distributed along the circumference of the annular sealing seat. The first group is obliquely upward, the second group is set horizontally, and the third group is obliquely downward.

5. The nitrogen electric heating device for the tire vulcanizing machine according to claim 1, characterized in that: The lower clamp is equipped with a nitrogen recovery port; the electric heating coil is multi-layered spiral.

6. The nitrogen electric heating device for the tire vulcanizing machine according to claim 5, characterized in that: A barrier plate is provided between two adjacent layers of the electric heating coil, and the outer edge of the barrier plate extends out of the outer side of the electric heating coil.

7. The nitrogen electric heating device for the tire vulcanizing machine according to claim 1, characterized in that: It also includes an electrically heated pressure vessel and a nitrogen recovery and vacuuming device. The outlet of the electrically heated pressure vessel is connected to the nitrogen inlet pipe through a nitrogen supply pipe. The nitrogen outlet pipe is connected to the nitrogen recovery and vacuuming device through a nitrogen return pipe A. The nitrogen recovery and vacuuming device is connected to the inlet of the electrically heated pressure vessel through a nitrogen return pipe B.

8. The nitrogen electric heating device for the tire vulcanizing machine according to claim 7, characterized in that: The nitrogen recovery vacuum device includes a piston cylinder and a reciprocating hydraulic cylinder for driving the piston cylinder. The front port and rear tongue of the piston cylinder are connected to the nitrogen return pipe A through a nitrogen return branch pipe A. A one-way valve A is installed on the nitrogen return branch pipe A to control the gas to enter the piston cylinder in one direction only. The front port and rear tongue of the piston cylinder are connected to the nitrogen return pipe B through a nitrogen return branch pipe B. A one-way valve B is installed on the nitrogen return branch pipe B to control the gas to flow out of the piston cylinder in one direction only.

9. The nitrogen electric heating device for the tire vulcanizing machine according to claim 8, characterized in that: The piston cylinder is a double piston rod cylinder, and the reciprocating cylinder is a double piston rod cylinder. The two ends of the piston rod of the reciprocating cylinder are connected to the two ends of the piston rod of the piston cylinder through connecting plates.

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