Conveyor belt vulcanizer design method and hydraulic basic circuit design principle

Conveyor belt vulcanizing machine is a device that uses hydraulic transmission skills for pressure processing. Compared with mechanical presses, it has pressure and speed that can be adjusted steplessly in a wide range. The vulcanizing machine can output all power in any position and maintain the required pressure. The structure of the vulcanizing machine is sensitive, the action of each actuator can easily reach the desired cooperative contact and many other advantages.

Most of the small and medium-sized vulcanizers now use mineral oil, such as hydraulic oil and mechanical oil. At the same time, most of them use single machine direct transmission. The vulcanizing machine planning is the same as any other mechanical planning, which is determined by the processing target-the technological requirements of the workpiece. Therefore, the entire planning process should first specifically analyze and restrict the movement of the workpiece to each actuator (including pressure, speed, relative azimuth connection and motion accuracy), working space and loading and unloading requirements.

The hydraulic components have a high degree of universal standardization characteristics, and the planning and manufacturing of the vulcanizing machine are relatively simple. Therefore, the vulcanizing machine is increasingly used in various sectors of the national economy, and according to the practical conditions of processing; refer to some typical structures of the vulcanizing machine plan and analyze and compare the collected reference materials such as the structural performance of similar products to confirm the overall plan of the vulcanizing machine The plan, then put forward specific requirements for the planning of the first parts and components and hydraulic systems, electrical systems, etc., and make specific calculations.

The semi-active direct transmission hydraulic system of the flat vulcanizing machine with a return cylinder. This system uses a combined oil pump. The oil pump is a vane-plunger combination. The vane pump outputs low-pressure oil for the rapid sealing of the flat vulcanizer and the plunger pump. The oil and plunger pump output high-pressure oil for the flat vulcanizing machine to reach the pressure required for normal vulcanization. The two pumps are driven by a double-shaft motor, and the oil pump is directly driven by the motor through the coupling. After the vulcanizing machine is vulcanized, the relay will be delayed. The operating oil of the low-pressure pump rises through the hydraulic control line to the hydraulic control check valve, and the main oil cylinder returns to the oil storage tank. At the same time, the pressure oil passes through the three-position four-way electro-hydraulic reversing valve, one-way travel speed control valve, and the shunt valve of the vulcanizing machine to the auxiliary cylinder to improve the speed of the platform. As the speed of the vulcanizing machine is accelerated, it will cause hydraulic shock. When the plug drops to a certain height, the limit switch controls the one-way travel speed regulating valve to save, and idle down the speed to achieve the purpose of buffering, and the remaining oil returns to the oil storage tank through the overflow valve.

In the process of vulcanizing machine planning, the problems we need to discuss and solve are as follows:

Analyze the requirements of the planning process to limit the technological process, and confirm the primary skill standard and action diagram of the vulcanizing machine.

Confirmation of the overall plan of the curing press. Calculation of strength and stiffness of primary components. Vulcanizing machine hydraulic system planning.

Vulcanizing machine electrical system planning. The electrical system of the vulcanizer is now driven by an AC motor, and the conventional relay circuit or transistor logic circuit is used as the control circuit.

When the vulcanization engine oil pump starts to work, the low-pressure oil hydraulic check valve is output through the three-position four-way electro-hydraulic directional valve, the one-way travel speed regulating valve, the three-position four-way electro-hydraulic directional valve, and the hydraulic control one-way valve to the main cylinder. At this moment, the hot plate of the flat vulcanizing machine is quickly closed. The oil in the output cylinder is returned to the oil storage tank by the shunt oil collection valve. After the hot plate is closed, the plunger pump operation is raised by the oil in the pipeline, the one-way valve of the vulcanizer is actively closed, the low pressure pump supplies high pressure oil, and the rest is returned to the storage through the overflow valve The mailbox and the high-pressure oil pass through the three-position four-way electro-hydraulic directional valve and the hydraulic control check valve to the main oil cylinder. When the pressure reaches 16Mpa, the vulcanized product needs modulus to deflate, then the voltage relay is operated. When the pressure of the conveyor vulcanization machine reaches the positive vulcanization pressure, the motor is closed.

On this basis, draw all work drawings and prepare all skill documents such as manufacturing acceptance skill conditions. So far, the planning stage is basically over. However, the correctness of the vulcanizing machine planning must be checked by practice, that is, the problems are found and solved after trial production and process testing, so that the planning meets all the expected requirements.