Safety device for actively controlling descending speed of suction cup of segment crane of shield tunneling machine

Abstract

The utility model belongs to the field of shield construction, and particularly relates to a safety device for actively controlling the descending speed of a suction cup of a segment crane of a shield tunneling machine, which comprises the segment crane and an ultrasonic ranging sensor arranged on the segment crane. The ultrasonic distance measuring sensor is electrically connected with the PLC; and the PLC is used for controlling the lowering speed of the segment crane. According to the safety device for actively controlling the descending speed of the suction cup of the segment crane of the shield tunneling machine, the ultrasonic distance measuring sensor is additionally arranged on the segment crane, active control over the descending speed of the vacuum suction cup of the segment crane of the shield tunneling machine can be achieved, the speed is reduced within a short distance, operation safety is guaranteed, the speed of the crane is not affected outside the control distance, and the safety is improved. The device not only improves the overall hoisting work efficiency of the duct piece, but also effectively avoids the time delay risk caused by the damage of a sealing system and the quality risk caused by the damage of the duct piece.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of shield construction, and particularly relates to a safety device for actively controlling the lowering speed of a shield machine segment crane suction cup. BACKGROUND

[0002] With the increasing ground traffic pressure of domestic cities, underground railway engineering gradually shoulders the heavy traffic duty, especially shield machine tunnel construction, which has the characteristics of high automation degree, safety and environmental protection, energy saving and high efficiency, stable quality, small climate influence, controllable surrounding building and ground subsidence and no influence on ground traffic.

[0003] For shield tunnels, prefabricated segments are used as lining structures instead of complicated support, anchoring and spraying protection processes, so that the shield machine can continuously construct and the tunneling speed is greatly improved. Meanwhile, prefabricated segments are mass-produced in factories, effectively ensuring the quality of permanent engineering components.

[0004] In the shield construction process, the transportation and installation of lining segments are very important and directly affect the construction progress, quality and safety. After the concrete segments are transported to the site, they are first lifted by a gantry crane or other vertical transportation equipment to the segment transportation plate car of the electric car group, then horizontally transported to the bottom of the shield machine No. 1 supporting trolley, and finally transported to the segment assembly area by the segment crane.

[0005] After the segments are transported to the bottom of the crane, the segment crane suction cup is lowered, the positioning pin is accurately inserted into the reserved hole of the concrete segment, the weight of the crane is used for pressing down, then the vacuum pump is started to remove the air between the rubber sealing washer and the surface of the concrete segment, the segment is lifted by atmospheric pressure, and the last step of horizontal transportation is realized.

[0006] However, due to the large weight of the segment crane, the shaking of the steel wire rope, and the fast lowering speed of the crane, the positioning pin cannot be effectively inserted into the reserved hole of the segment, the flexible rubber sealing washer is often damaged, the vacuum system is invalid, the entire flexible rubber sealing washer must be replaced for continuous construction, and the segment corner is damaged by the crane in serious cases, which needs to be pulled out and replaced, seriously affecting the construction progress. INVENTION CONTENTS

[0007] The utility model aims at overcoming the defects in the prior art and provides a safety device for actively controlling the lowering speed of a shield machine segment crane suction cup.

[0008] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0009] The utility model provides a safety device of initiative control shield segment crane suction disc descending speed, including segment crane and the ultrasonic ranging sensor of setting on segment crane, ultrasonic ranging sensor with PLC controller electricity is connected, the PLC controller controls segment crane lowering speed.

[0010] Segment crane includes crane main part and the crane vacuum chuck of setting in the bottom of crane main part, the bottom of crane vacuum chuck is provided with rubber sealing washer, and the empty groove for placing ultrasonic ranging sensor is arranged on the crane vacuum chuck.

[0011] The crane main part is connected with the crane vacuum chuck through the reinforcing rope.

[0012] The crane vacuum chuck is provided with the suction pipeline connected with vacuum pump, and the vacuum pressure gauge and control valve are arranged on the suction pipeline.

[0013] The bottom of the crane vacuum chuck is provided with a positioning pin matched with the segment prefabricated hole.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The safety device of initiative control shield segment crane suction disc descending speed (hereinafter referred to as device) of the application can realize the initiative control of the descending speed of the vacuum chuck of the segment crane by adding the ultrasonic ranging sensor on the segment crane, reduce the speed within a short distance to ensure the operation safety, and the speed of the crane is not affected outside the control distance. The device not only improves the overall segment hoisting efficiency, but also effectively avoids the time delay risk caused by the damage of the sealing system and the quality risk caused by the damage of the segment.

[0016] The device does not affect the sealing system of the crane vacuum chuck itself, is easy to install, does not cause additional burden to the worker's production task, and the ranging control system is automatically operated throughout the process, without the need for workers to execute commands, effectively avoiding the influence of human factors.

[0017] The signal transmission principle of the device is clear, simple and reasonable, has high safety factor, is flexible and fast to disassemble and assemble, has high practicability and controllability, has high adaptability, reasonable position, simple wiring, clear instructions, is not easy to damage, has good transformability, accurate distance control, fast signal transmission, and good user experience after installation. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the whole structure schematic diagram of the safety device of initiative control shield segment crane suction disc descending speed. DETAILED DESCRIPTION

[0019] In order to make the technical personnel in the technical field better understand the technical scheme of the utility model, the utility model will be further explained in detail below in combination with the drawings and the best embodiment.

[0020] Figure 1 The utility model discloses a kind of safety devices for actively controlling shield machine segment crane suction cup lowering speed, including segment crane and the ultrasonic ranging sensor 9 being arranged on the segment crane;The ultrasonic ranging sensor is electrically connected with PLC controller 12;The PLC controller controls the segment crane lowering speed.The selection of ultrasonic ranging sensor of the embodiment can be: brand LORDDOM, model UB1000, metal material, detection distance 60-1000mm, output signal PNP, size 18*18*60mm, working current 0.2A, working voltage 24V.The selection of PLC controller 12 can be: brand VOKM, model YK3U-16L, working voltage 24V.

[0021] The segment crane includes crane main body and the vacuum suction cup 3 being arranged at the bottom of the crane main body;The bottom of the vacuum suction cup is provided with rubber sealing washer 6;The vacuum suction cup is provided with empty groove for placing ultrasonic ranging sensor 9.First, the center position of vacuum suction cup 3 panel is opened Φ18mm round hole, ultrasonic ranging sensor 9 is inserted and fixed by its nut, if there is reserved round hole, it can be directly installed, pay attention to nut needs to set rubber pad to guarantee sealing effect;The connecting wire 10 of ultrasonic ranging sensor 9 and PLC controller 12 is routed through the cavity inside vacuum suction cup 3, and PLC controller 12 is installed on the top of vacuum suction cup 3 and firmly fixed;

[0022] The crane main body is connected with the vacuum suction cup 3 by reinforcing rope 8.

[0023] The vacuum suction cup 3 is provided with suction pipeline connected with vacuum pump;Vacuum pressure gauge 7, vacuum sensor 4 and control valve (not shown) are arranged on the suction pipeline.

[0024] The bottom of the vacuum suction cup 3 is provided with positioning pin 5 matched with segment prefabricated hole.

[0025] The key points of the device are: first, the optimization of vacuum suction cup 3 function, on the basis of original vacuum system, increase ultrasonic ranging sensor 9, its released ultrasonic signal 11 is used for real-time detection of the relative distance between vacuum suction cup 3 and concrete segment 2 (arranged on segment transport board car 1) surface, when the distance between the two is close (generally 0~0.3m range), forcedly reduce crane lowering speed, avoid damaging rubber sealing washer 6 due to too fast speed.

[0026] Second, the optimization of the crane vacuum chuck 3 structure, in the center of the crane vacuum chuck 3, rubber sealing gasket 6 inside the reserved transceiver integrated ultrasonic ranging sensor 9 installation groove, wire 10 through the slot with the crane itself wiring system common wiring.

[0027] Third, the connection wire 10 end and PLC controller 12 connected, programmable logic control, the distance signal into a control signal, in the crane chuck 3 and concrete segment 2 distance in 0 ~ 0.3 m range, to achieve the function of active control of the descent speed.

[0028] Fourth, the ranging sensor is transceiver integrated ultrasonic ranging sensor 9, such sensors in the concrete segment 2 inner arc surface usually exist in the flushing water conditions, and in the negative pressure state is also applicable, and the protection level is high and not easy to damage.

[0029] The device design principle: segment crane by vacuum chuck 3, vacuum sensor 4, positioning pin 5, rubber sealing gasket 6, vacuum pressure gauge 7, steel wire rope 8 and other key components, segment transport to the crane below, put down the segment crane vacuum chuck 3, through the positioning pin 5 accurately inserted into the concrete segment 2 reserved hole, and use the crane weight down, and then start the vacuum pump, the rubber sealing gasket 6 and the surface between the concrete segment 2 air is removed, using atmospheric pressure to lift the segment, realize the last step of horizontal transportation.

[0030] The method fully considers the operability of the shield segment crane in the process of operation and the shield segment in the hoisting construction process, reduces the influence of human factors and design defects of the equipment itself, considers the site operation condition, the installability of the control system and the simplicity of the worker operation, eliminates the safety hidden danger and guarantees the engineering quality.

[0031] The above content is only the preferred embodiment of the present application, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, the content of the specification should not be understood as the limitation of the present application.

Claims

1. A safety device for actively controlling the speed of descent of a shield machine segment lifter suction cup, characterised in that, Including pipe piece hoist and be provided with ultrasonic ranging sensor on pipe piece hoist, ultrasonic ranging sensor with PLC controller electricity is connected, PLC controller controls pipe piece hoist lower speed.

2. The safety device for actively controlling the shield machine segment crane suction cup lowering speed according to claim 1, characterized in that, Pipe piece hoist includes hoist body and the hoist vacuum chuck of setting in the bottom of hoist body, the bottom of hoist vacuum chuck is provided with rubber sealing washer, and the empty groove for placing ultrasonic ranging sensor is provided on the hoist vacuum chuck.

3. The safety device for actively controlling the shield machine segment crane suction cup lowering speed according to claim 2, characterized in that, The hoist body is connected with the hoist vacuum chuck through the steel rope.

4. The safety device for actively controlling the shield machine segment crane suction cup lowering speed according to claim 2, characterized in that, The hoist vacuum chuck is connected with the vacuum pump through the suction pipeline, and the vacuum pressure gauge and the control valve are arranged on the suction pipeline.

5. The safety device for actively controlling the shield machine segment crane suction cup lowering speed according to claim 2, characterized in that, The bottom of the hoist vacuum chuck is provided with a positioning pin matched with the pipe piece precast hole.

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