Pneumatic safety device

Abstract

The invention discloses a pneumatic safety device comprising a mechanically-controlled two position three-way valve and a pneumatically-controlled two position three-way valve; the mechanically-controlled two position three-way valve comprises an air inlet, an air outlet and a control valve rod; the pneumatically-controlled two position three-way valve comprises an air inlet, an air outlet and a control opening; and the air outlet of the mechanically-controlled two position three-way valve is communicated with the control opening of the pneumatically-controlled two position three-way valve. When the pneumatic safety device is in working, the control valve rod of the mechanically-controlled two position three-way valve is in transmission connection with a fault part, the air outlet of the mechanically-controlled two position three-way valve is communicated with the control opening of the pneumatically-controlled two position three-way valve, and the air outlet of the pneumatically-controlled two position three-way valve is communicated with an air inlet of an effected part, thus, the mechanical movement of the fault part can control whether the air outlet of the mechanically-controlled two position three-way valve gets air or not through the control valve rod, and then control whether the air outlet of the pneumatically-controlled two position three-way valve gets air or not and control whether the air inlet of the effected part gets air or not, and finally, a linkage relationship is established between the mechanical movement of the fault part and the normal movement of the effected part.

Description

technical field [0001] The invention relates to a pneumatic safety device. Background technique [0002] In industrial production, in many cases, some (pieces) of components (hereinafter referred to as "failure components") will affect other certain (pieces of) components or the whole machine (hereinafter referred to as "affected components") if they do not work properly. Therefore, it is necessary to set up safety devices between these components, and turn off the affected components in time when the faulty components are not working properly. In a system using pneumatic control, whether some "faulty parts" have failed can be judged by the mechanical movement of the part, how to easily compare the mechanical movement (or open or not) of these "faulty parts" "It has always been a technical problem to establish a linkage relationship between the normal operation of the system. For example, the load-bearing mechanisms currently used between the upper and lower derricks of oi...

AI Technical Summary

Problems solved by technology

For example, the load-bearing mechanisms currently used between the upper and lower derricks of oil workover rigs mainly include mechanical load-bearing mechanisms and pneumatic load-bearing mechanisms; The upper derrick falls on the bearing block; the pneumatic bearing mechanism is that the operator visually confirms that the upper derrick is in place, and then stretches the bearing block through the cylinder, so that the upper derrick falls on the bearing block; in the actual use process, the two bearing mechanisms are possible There is a situation that the bearing block is not opened, because the bearing block and the drum are not linked, if the bearing block is not opened, the upper derrick cannot fall on the bearing block normally, and the drum continues to rotate, it will inevitably cause safety problems

In the above-mentioned oil workover rig, the "faulty part" is the bearing block, and the fault phenomenon is that the bearing block is not fully opened and has not reached the position of the normal bearing upper derrick

The "affected part" is the drum clutch. If the drum is running normally at this time, the upper derrick will cause safety problems because it cannot fall on the bearing block normally.

At present, there is no pneumatic safety device on the market that can establish a linkage relationship between the mechanical movement of the "faulty part" and the normal operation of the "affected part"

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