Open shield machine, support device, control system and control method thereof

Abstract

The invention discloses an open type shield machine, a support device and a control system and a control method of the support device. The control system can be used for controlling passive retraction of a slotting tool of the support device, and comprises a slotting tool oil cylinder with the slotting tool on a piston rod, a proportional overflow valve with an oil inlet communicated with a rodless cavity of the slotting tool oil cylinder and an oil outlet connected with an oil tank, a controller used for adjusting the pressure of the proportional overflow valve, and a displacement sensor which is used for detecting the extending displacement of the slotting tool and is connected with the controller. According to the control system, the passive retraction of the slotting tool can be achieved, so that the retraction speed of the slotting tool is basically the same as the forward speed of the shield machine and the stability of a soil body supported by the support device is kept; in addition, the control system does not need to be monitored in real time and operated by an operator, so that the labor intensity of the operator is reduced and the accident of soil body collapse caused by improper manual operation is reduced.

Description

Technical field [0001] The invention relates to the field of hydraulic control, in particular to an open shield machine, a supporting device, a supporting device control system and a control method. Background technique [0002] The open shield machine is suitable for the stratum with a certain self-stabilization ability on the excavation surface. There is no cutter head at the front end, and there is no closed partition between the excavation surface and the inner cabin, so that all the excavation surface conditions can be seen directly. In order to prevent soil and rock from collapsing or flowing back into the inner compartment of the shield machine, the open shield machine is equipped with a supporting device on the top of its front end. The supporting device is composed of a slotting knife and a supporting baffle. The slotting knife is used to insert the soil forward. In the layer, the soil above it is supported to prevent collapse, and the supporting baffle is used to suppor...

AI Technical Summary

Problems solved by technology

[0004] However, in the existing open-type shield machine structure, the retraction of the inserting knife is either manually set a pressure threshold, and when the resistance (the reaction force of the soil) received by the inserting knife is greater than the pressure threshold, the inserting knife will retract. However, the pressure threshold is a fixed value, which cannot adapt to the changeable formation structure; another way to realize the retraction of the thrusting knife is to monitor and operate the supporting device in real time by the operator, so as to ensure that the thrusting knife retracts as closely as possible. The shield machine advances forward to maintain synchronization, but it has high requirements for operators, which increases the workload of the operators, and it is very easy to operate improperly, causing the retraction of the inserting knife to be inconsistent with the advancing speed of the shield machine, causing soil collapse accidents

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