1. Core Components and Working Principle
The hydraulic system of the slow pressure boosting device is primarily composed of a variable speed motor (5), a combination pump (1), a low-pressure relief valve (2), a high-pressure relief valve (3), a check valve (4), and pipelines.
Driving and Oil Supply: The combination pump (1) is driven by the variable speed motor (5) and draws oil from the original press's oil tank. The oil discharged by the combination pump enters the lower chamber of the intensifier via the check valve (4).
Start Timing: During the operation of the six-anvil press, the slow pressure boosting device is activated after the original system's oil pump stops working. This occurs after the no-load advance, fluid filling, and pressurization have reached a specific pressure value determined by the synthesis process (e.g., 50MPa). The oil then enters the lower chamber of the intensifier, causing the system pressure to rise slowly.

2. Precise Regulation of Pressure Boosting Speed
The key to precise control lies in using the variable speed motor to accurately control the flow rate of the combination pump, ensuring the system slowly boosts pressure according to process requirements.
Speed Adjustment Range: The variable speed motor (5) has a speed adjustment range of 125 to 1250 r/m.
 Accurate Flow Output: Correspondingly, the flow rate of the plunger pump can be adjusted within the range of 0.05 to 0.5 L/min.

Adaptation to Process Needs: This capability for flow regulation enables the hydraulic system to adapt to the needs of the superhard material synthesis process, ensuring that the pressure boosting process can proceed slowly according to process requirements.

3. Achieving Closed-Loop Control Accuracy
Although the device utilizes the more economical open-loop control method, it can still meet high-precision control requirements through careful design and coordination:
Accuracy Assurance: Due to the moderate displacement design of the pump, coupled with the appropriate adjustment of the rotation speed, the device can similarly achieve the accuracy of closed-loop control.
Pressure Stability: This design meets the process requirement for pressure stability, thereby significantly improving the synthesis quality of superhard materials.

4. High-Precision Pressure Holding Control
When the required pressure is reached and the system enters the pressure holding state, the device continues to operate at a lower speed to maintain the system pressure.
Pressure Holding Accuracy: The device can maintain the system's pressure holding accuracy within the range of ±0.2MPa until the pressure holding period ends.
Process Guarantee: This precise control not only ensures the fulfillment of process requirements during composite sheet production but also guarantees the precise control of pressure during the holding process.

Through these mechanisms, the hydraulic system achieves precise, slow, and stable control over the pressure during the synthesis of superhard materials (such as diamond, composite sheets, and cubic boron nitride), which helps improve product quality and synthesis quality.