Safety pressure relief protection system for central mechanism of vulcanizing machine

Abstract

The utility model relates to a safety pressure relief protection system for a central mechanism of a vulcanizing machine, and belongs to the field of tire vulcanizing devices. A branch pipeline is installed on a central mechanism lifting power water main pipeline, a central mechanism lifting stop valve and a central mechanism lifting pneumatic valve are connected to the branch pipeline in series, and the branch pipeline is communicated with an inner cavity of the central mechanism through a central mechanism lifting power branch water pipe. A central mechanism power lowering branch water pipe, a central mechanism power lowering pneumatic valve and a central mechanism power lowering stop valve are communicated with a central mechanism power lowering water main pipeline, and branch pipelines are installed on the two sides of a central mechanism power lowering pneumatic valve in parallel and additionally provided with a set of central mechanism power lowering overflow valves. A set of branch pipeline is installed on a central mechanism lifting power branch water pipe connected with a central mechanism lifting pneumatic valve and a central mechanism inner cavity in parallel, and a central mechanism drop safety pressure relief stop valve and a central mechanism drop safety pressure relief explosion valve are installed on the branch pipeline in series. And the central mechanism safety relief explosion valve is connected with the central mechanism safety relief emptying pipe.

Description

Technical Field

[0001] This utility model relates to the field of tire vulcanizing equipment, specifically a safety pressure relief protection system for the central mechanism of a type B vulcanizing machine. Background Technology

[0002] As is well known, in the field of vulcanizing equipment during tire manufacturing, the tire shaping vulcanizing machine is a crucial piece of equipment, primarily used for the vulcanization and shaping of hollow tires. According to the traditional bladder operation structure, there are three main types (Type A, Type B, and Type AB), with other types being modifications of these three basic types. The Type B vulcanizing machine's bladder operation structure mainly consists of a central mechanism. The operation of the Type B central mechanism is primarily hydraulically driven, with some designs also employing hydraulic or mechanical mechanisms. The advantages of the Type B central mechanism are good centering and accurate shaping, making it widely used in tire factories. If the problem stems from improper pipeline design, flawed programming, or operational malfunctions, especially noticeable in B-type vulcanizing machines of 88 inches and above, during normal production operation, a failure in the central mechanism's downcomer pipeline can prevent backflow. As the upper mold assembly descends, the external force of mold closing presses down the central rod of the central mechanism, causing the piston to descend. Simultaneously, the kinetic water within the central mechanism cannot be properly discharged, leading to increased pressure. This can easily cause cylinder rupture due to increased internal pressure, posing a significant safety hazard. Furthermore, it results in tire scrapping during production, prolonged equipment downtime for maintenance, and reduced production efficiency, leading to substantial cost waste. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a safety pressure relief protection system for the central mechanism of a vulcanizing machine, which protects the safe operation of the central mechanism and completely solves the huge safety hazard caused by the increased internal pressure of the central mechanism and the rupture of the cylinder when the central mechanism cannot form backflow due to pipeline failure.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a safety pressure relief protection system for the central mechanism of a vulcanizing machine, comprising a lower mold assembly, a movable upper mold assembly on top of the lower mold assembly, an upper mold steel ring positioning ring in the middle of the upper mold assembly, a central mechanism in the middle of the lower mold assembly, an exposed portion of the central mechanism comprising a central mechanism central rod and a clamping positioning ring on the capsule, which are connected to the piston of the central mechanism central rod, a central mechanism central rod conduit inside the central mechanism, the upper end of the central mechanism central rod conduit inserted into the inner cavity of the central mechanism central rod, the lower end of the central mechanism central rod conduit connected to the central mechanism depressurization branch water pipe, and a branch pipe installed on the central mechanism lift water main pipe. The branch pipeline is connected in series with a central mechanism lifting stop valve and a central mechanism lifting pneumatic valve. After being connected to the central mechanism's internal cavity through the central mechanism lifting power branch water pipe, it is connected to the central mechanism's reducing power branch water pipe, central mechanism reducing pneumatic valve, and central mechanism reducing stop valve to the central mechanism's reducing power main pipeline. A set of central mechanism reducing overflow valves is installed in parallel on branch pipelines on both sides of the central mechanism lifting pneumatic valve. A set of branch pipelines is installed in parallel on the central mechanism lifting power branch water pipe connecting the central mechanism lifting pneumatic valve and the central mechanism's internal cavity. A central mechanism reducing safety pressure relief stop valve and a central mechanism reducing safety pressure relief burst valve are installed in series on the branch pipeline. The central mechanism reducing safety pressure relief burst valve is connected to the central mechanism reducing safety pressure relief drain pipe.

[0005] The beneficial effect of this utility model is that it protects the safe operation of the central mechanism and achieves normal mold-closing production conditions, thereby achieving the dual protection purpose of the pipeline system. Attached Figure Description

[0006] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0007] Figure 1 This is a schematic diagram of the structure of the present invention in the mold-open state.

[0008] Figure 2 This is a schematic diagram of state 1 of the mold closing process of this utility model.

[0009] Figure 3 This is a schematic diagram of state 2 of the mold closing process of this utility model.

[0010] Figure 4 This is a schematic diagram showing the mold closing position of this utility model.

[0011] In the diagram: 1. Lower mold assembly, 2. Upper mold assembly, 3. Upper mold steel ring positioning ring, 4. Central mechanism, 5. Central mechanism center rod, 6. Capsule upper clamp positioning ring, 7. Central mechanism center rod piston, 8. Central mechanism center rod conduit, G1. Central mechanism lifting power main water pipe, G2. Central mechanism lifting stop valve, G3. Central mechanism lifting pneumatic valve, G4. Central mechanism lifting power branch water pipe, G5. Central mechanism lowering power branch water pipe, G6. Central mechanism lowering pneumatic valve, G7. Central mechanism lowering stop valve, G8. Central mechanism lowering power main water pipe, G9. Central mechanism lowering overflow valve, G10. Central mechanism lowering safety pressure relief stop valve, G11. Central mechanism lowering safety pressure relief burst valve, G12. Central mechanism lowering safety pressure relief drain pipe. Detailed Implementation

[0012] In the figure, this utility model includes a lower mold assembly 1, a movable upper mold assembly 2 on the upper part of the lower mold assembly 1, an upper mold steel ring positioning ring 3 in the middle of the upper mold assembly 2, a central mechanism 4 in the middle of the lower mold assembly 1, a central mechanism central rod 5 and a capsule upper clamping positioning ring 6 on the exposed part of the central mechanism 4, which are connected to the central mechanism central rod piston 7, and a central mechanism central rod conduit 8 is provided inside the central mechanism 4. The upper end of the central mechanism central rod conduit 8 is inserted into the inner cavity of the central mechanism central rod 5. The lower end of pipe 8 is connected to the central mechanism's power-reducing branch water pipe G5. A branch pipe is installed on the central mechanism's power-raising main water pipe G1. The branch pipe is connected in series with the central mechanism's power-raising shut-off valve G2 and the central mechanism's power-raising pneumatic valve G3. After connecting to the inner cavity of the central mechanism 4 through the central mechanism's power-raising branch water pipe G4, it is connected to the central mechanism's power-reducing branch water pipe G5, the central mechanism's power-reducing pneumatic valve G6, and the central mechanism's power-reducing shut-off valve G7, and is connected to the central mechanism's power-reducing main water pipe G8. A set of central mechanism power-raising pneumatic valve G3 is installed in parallel on both sides of the central mechanism's power-raising pneumatic valve G3. The overflow valve G9 of the mechanism is connected in parallel to a branch pipe on the central mechanism lifting pneumatic valve G3 and the central mechanism lifting power branch water pipe G4, which connects the inner cavity of the central mechanism 4. A central mechanism safety pressure relief shut-off valve G10 and a central mechanism safety pressure relief burst valve G11 are connected in series on this branch pipe and connected to a trench via a central mechanism safety pressure relief vent pipe G12 to allow ventilation to the atmosphere. When the central mechanism 4 is pressed down by the external force of mold closing, causing the central mechanism central rod 5 to descend and driving the central mechanism central rod piston 7 to descend, due to the internal dynamic... When the water cannot be discharged normally, the pressure increases. When the pressure reaches the set pressure of the overflow valve G9, the overflow valve G9 automatically opens to overflow and reduce the internal pressure. When the overflow of the overflow valve G9 cannot meet the pressure relief and the internal pressure continues to rise, when the pressure reaches the set pressure of the safety pressure relief burst valve G11, the valve gasket of the safety pressure relief burst valve G11 opens, connecting the central mechanism 4 to the atmosphere through the central mechanism safety pressure relief vent pipe G12, protecting the safe operation of the central mechanism 4, and achieving normal mold closing production conditions, thereby achieving the dual protection purpose of the pipeline system.

[0013] The central mechanism overflow valve G9 and the central mechanism safety pressure relief burst valve G11 are both connected in parallel with the central mechanism pneumatic valve G3 to ensure that any set of pipelines can effectively relieve pressure and ensure safe operation.

[0014] The set pressure of the central mechanism relief valve G9 is 0.2 MPa higher than the highest operating pressure in the system, so as to ensure that the relief valve acts as the first safety control valve during normal production and ensure safe operation.

[0015] The set pressure of the central mechanism's safety pressure relief burst valve G11 is 0.2 MPa higher than the maximum operating pressure of the central mechanism's overflow valve, so as to ensure that the safety pressure relief burst valve acts as a second safety control valve during normal production and ensures safe operation.

[0016] Manual operation of the capsule's normal straightening and contraction process: Manually open the central mechanism's lifting switch. The program automatically starts and opens the central mechanism's lifting pneumatic valve G3 and lowering pneumatic valve G6. Power water flows from the central mechanism's lifting power water main pipe G1 through the central mechanism's lifting stop valve G2 and lifting pneumatic valve G3, and then enters the central mechanism 4's inner cavity through the central mechanism's lifting power water branch pipe G4. This pushes the central mechanism's central rod piston 7 upward, causing the capsule's clamping positioning ring 6 to rise and straighten the capsule. During the rising process, the water in the upper cavity of the central mechanism's central rod piston 7 flows through the central mechanism's lowering power water branch pipe G5, lowering pneumatic valve G6, and lowering stop valve G7 into the central mechanism's lowering power water main pipe G8, forming a circulation backflow and completing the straightening function. Conversely, when the central mechanism lowering switch is manually opened, the program automatically activates the central mechanism lowering pneumatic valve G6 and the central mechanism raising pneumatic valve G3. Power water enters the upper cavity of the central mechanism 4 through the central mechanism lowering power water main pipe G8, the central mechanism lowering stop valve G7, the central mechanism lowering pneumatic valve G6, the central mechanism lowering power water branch pipe G5, and the central mechanism central rod conduit 8. As the central mechanism central rod piston 7 presses down, it drives the clamp positioning ring 6 on the capsule to descend and retract the capsule. During the descent, the water in the lower cavity of the central mechanism central rod piston 7 enters the central mechanism raising power water main pipe G1 through the central mechanism raising power water branch pipe G4, the central mechanism raising pneumatic valve G3, and the central mechanism raising stop valve G2 to form a circulation backflow, completing the capsule retraction function.

[0017] The specific production operation process is as follows: all media shut-off valves are opened before production; during the production process, the mold is in the open state ( Figure 1 ) Start the switch to raise the center rod 5 of the central mechanism. The pneumatic valve G3 of the central mechanism opens. Power water flows from the main power water pipe G1 of the central mechanism through the stop valve G2 and the pneumatic valve G3 of the central mechanism, and then enters the inner cavity of the central mechanism 4 through the power water branch pipe G4 of the central mechanism. This pushes the piston 7 of the center rod of the central mechanism to rise, which drives the positioning ring 6 of the clamp on the capsule to rise and straighten the capsule. After the embryo is loaded between the capsule and the mold by the robot, the shaping switch is manually started. The capsule is filled with shaping internal pressure. During the internal pressure filling process, the capsule expands and fills the inner cavity of the embryo for embryo shaping. The automatic mold closing switch is manually started. The upper mold assembly 2 moves down at the concentric position with the lower mold assembly 1 under the drive of external force. When the positioning ring 3 of the upper mold steel ring contacts the positioning ring 6 of the clamp on the capsule, ( Figure 2Under the action of external force, it continues to move downward. During the downward movement, the pressure inside the embryo cavity increases and the piston 7 of the center rod of the upper mold assembly 2 descends under the downward pressure. Figure 3 To prevent the central rod 5 from driving the positioning ring 6 on the capsule to descend too quickly after the central mechanism's lifting pneumatic valve G3 opens, thus causing the embryo to fail to solidify, the program is set to automatically close the mold without activating the central mechanism's lifting pneumatic valve G3 and lowering pneumatic valve G6. This creates a certain pressure within the central mechanism's cavity, generating a reaction force. When the pressure inside the central mechanism 4 increases and reaches the set pressure of the central mechanism's lowering overflow valve G9, the valve automatically opens to overflow and reduce the internal pressure. When the overflow from the central mechanism's lowering overflow valve G9 is insufficient to relieve pressure, causing the internal pressure to continue rising, and reaching the set pressure of the central mechanism's lowering safety pressure relief burst valve G11, the valve gasket of the central mechanism's lowering safety pressure relief burst valve G11 opens, connecting the central mechanism 4 to the atmosphere through the central mechanism's lowering safety pressure relief vent pipe G12. This protects the safe operation of the central mechanism 4 and ensures normal mold closing and production conditions. Figure 4 The system begins normal vulcanization, thus achieving dual protection for the pipeline system. This completely resolves the significant safety hazard posed by increased internal pressure in the central mechanism due to pipeline malfunctions preventing backflow, which could lead to cylinder rupture. Furthermore, it addresses issues such as tire scrapping during production, prolonged equipment downtime for maintenance, reduced production efficiency, and substantial cost waste.

Claims

1. A vulcanizing machine center mechanism safety pressure relief protection system, provided with a lower mold assembly, a movable upper mold assembly is arranged on the upper part of the lower mold assembly, an upper mold steel ring positioning ring is arranged in the middle of the upper mold assembly, a center mechanism is arranged in the middle of the lower mold assembly, the exposed part of the center mechanism is provided with a center mechanism center rod and a capsule upper clamp positioning ring, and is connected with a center mechanism center rod piston, a center mechanism center rod guide pipe is arranged in the center mechanism, the upper end of the center mechanism center rod guide pipe is inserted into the inner cavity of the center mechanism center rod, and the lower end of the center mechanism center rod guide pipe is connected with a center mechanism power reduction branch water pipe, characterized in that, Install branch pipeline on the central mechanism lift power water main, the branch pipeline is connected with central mechanism lift stop valve and central mechanism lift pneumatic valve, through the central mechanism lift power branch water pipe and central mechanism inner cavity, through central mechanism drop power branch water pipe, central mechanism drop pneumatic valve, central mechanism drop stop valve and central mechanism drop power water main, install a set of central mechanism drop overflow valve on both sides of central mechanism lift pneumatic valve, install a set of branch pipeline on the parallel connection of central mechanism lift pneumatic valve and central mechanism inner cavity connection central mechanism lift power branch water pipe, install central mechanism drop safety pressure relief stop valve and central mechanism drop safety pressure relief burst valve in series on the branch pipeline, and the central mechanism drop safety pressure relief burst valve is connected with central mechanism drop safety pressure relief exhaust pipe.

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