Integrated load limiting valve and actuator with mechanically adjustable output force

Abstract

The invention provides a load limiting integrated valve and an actuator with mechanically adjustable output force. The load limiting integrated valve comprises a valve body and has the specialness that a first pilot overflow valve and a second pilot overflow valve are installed on the valve body; an oil drainage outlet of the first pilot overflow valve communicates with an oil inlet of the second pilot overflow valve; and an oil drainage outlet of the second pilot overflow valve communicates with an oil inlet of the first pilot overflow valve. Through the load limiting integrated valve, the influence of change of load pressure on the control precision is eliminated, the precision is high, and self-excited vibration is not liable to occur.

Description

technical field [0001] The patent of the invention relates to a mechanically adjustable load limiting integrated valve for controlling the output force of a servo actuator, which belongs to the technical field of servo loading systems. Background technique [0002] The servo loading system is used for static or fatigue tests of various test pieces. In most cases, the test piece is expensive and the test period is long. Abnormal damage to the test piece is not allowed during the test, otherwise it will cause great losses. This requires The loading system has a reliable protection function for the test piece. [0003] The servo loading system can generally set protection functions in the three links of hydraulic source, electrical control system and actuator-servo actuator, by cutting off the power source, changing the action and unloading of the servo actuator, etc. protection of. Among them, installing a protection module on the servo actuator is the best protection method...

AI Technical Summary

Problems solved by technology

[0006] 1. Complex structure and high cost;

[0007] 2. Large size and inconvenient installation;

[0008] 3. Direct-acting pressure regulation, easy to self-excited vibration, difficult to adjust the load limit value, low control accuracy;

[0009] 4. The area ratio of the pressure regulating valve core at both ends of the valve corresponds to the area ratio of the two chambers of the actuator one by one, and there is no interchangeability and versatility

[0010] In view of the above deficiencies, this load limiting valve has not been widely accepted by the market

[0011] So far, although there is a great market demand for load limiting valves, there are no available products

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