Numerical control frame type over travel protective device for main cylinder of hydraulic machine
A technology of protection device and hydraulic machine, which is applied in the field of hydraulic machinery, can solve problems such as damage to the hydraulic components of the main oil cylinder, personal safety accidents of operators, etc., and achieve the effect of protecting hydraulic components, ensuring personal safety, and improving the operating safety factor
Inactive Publication Date: 2011-11-23
TIANJIN TIANDUAN PRESS CO LTD
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Problems solved by technology
If an operation failure occurs during the pressurization process of the hydraulic press, and the stroke of the main cylinder of the press exceeds the lower limit, the main cylinder will continue to descend due to the pressure in the upper cavity, which will cause damage to the main cylinder and related hydraulic components. In severe cases It may even cause personal safety accidents for operators.
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[0014] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:
[0015] see Figure 1-Figure 3 , the overtravel protection device for the main cylinder of the CNC frame hydraulic press, including the oil cylinder composed of the main cylinder 6 of the press, the pump unit 1, the return cylinder 7, the pressure regulating valve 3 of the main cylinder, the overtravel valve block 4 and the integrated control valve block 2 Main cylinder pressure release circuit when descending pressurization circuit and oil cylinder overtravel during normal work, be installed on the collision block 5 on the both sides of hydraulic machine guide column 10, upper limit limit collision block 11, lower limit limit collision block 12 and be installed on Limit limit switch on master cylinder. The limit limit switches include: an up...
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The invention relates to a numerical control frame type over travel protective device for a main cylinder of a hydraulic machine. The numerical control frame type over travel protective device for the main cylinder of the hydraulic machine is characterized by comprising a downlink pressurizing loop while an oil cylinder works normally and a main cylinder pressure releasing loop while the oil cylinder exceeds the travel, collision blocks mounted on the two sides of a hydraulic machine guide column and an extreme limiting switch mounted on the main cylinder, wherein the oil cylinder is formed by connecting a press main cylinder, a return cylinder, a pumping set, a main cylinder pressure regulating valve, an over travel valve block and an integrated control valve block. The numerical control frame type over travel protective device for the main cylinder of the hydraulic machine has the following advantages that: through the additionally arranged over travel valve block connected with the main cylinder pressure regulating valve in parallel, the collision blocks can collide the over travel valve block while electric operation is out of control and the press main cylinder exceeds a lower travel limit to continue to move downwards so that a roller reversing valve is reversed to release the pressure at a main cylinder upper chamber of the hydraulic machine; therefore, accidents caused by over travel of the main cylinder with pressure can be avoided to realize the purpose of protecting the press main cylinder and other hydraulic elements; moreover, the safety coefficient in operation can be also largely increased to assure the personal safety of the operators.
Description
technical field [0001] The invention belongs to the technical field of hydraulic machinery, and in particular relates to an overtravel protection device for a main cylinder of a numerical control frame hydraulic machine. Background technique [0002] The main cylinder is the main actuator in the hydraulic press. During work, the main cylinder needs to run up and down continuously to complete the pressing and forming of the workpiece. Under normal circumstances, the hydraulic machine is equipped with a mechanical limit limit switch outside the stroke range required by the user. Through interlocking with the electrical, when the main oil cylinder moves to the upper limit or lower limit, the hydraulic machine will be cut off to protect the safety of the press. If an operation failure occurs during the pressurization process of the hydraulic press, and the stroke of the main cylinder of the press exceeds the lower limit, the main cylinder will continue to descend due to the pres...
Claims
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IPC IPC(8): B30B15/28
CPCB30B15/285
Inventor 管亚彬
Owner TIANJIN TIANDUAN PRESS CO LTD