Intelligent mixing device for water-rich sandstone interbedded shield machine soil bin

Abstract

The utility model relates to long distance big longitudinal slope sand and mudstone interbedded shield fast tunneling key technical field especially relates to a kind of water-rich sand and mudstone interbedded shield machine soil bin intelligent mixing device, solve the problem such as the limited stirring range in soil bin, low mud circulation rate, increase the rubber stick range in soil bin, improve mud circulation rate, including along the soil bin intelligent mixing device of fixed shield machine axial, the soil bin intelligent mixing device is connected with shield machine control system, the soil bin intelligent mixing device includes variable frequency motor, telescopic link, transmission shaft and initiative mixing device;The variable frequency motor is fixed on the back side wall of soil bin, the output of the variable frequency motor is connected the telescopic link, the front end of the telescopic link is connected the transmission shaft, the front end of the transmission shaft is installed with fender, multiple initiative mixing devices are equipped on the front side of the fender;When slag in soil bin is more accumulation, shield machine control system drives telescopic link to lengthen, increase stirring range.

Description

Technical Field

[0001] This utility model relates to the key technology of rapid tunneling of long-distance, steep-slope sand and mudstone interbedded shield tunnels, and in particular to an intelligent mixing device for the soil chamber of a water-rich sand and mudstone interbedded shield tunnel. Background Technology

[0002] With the gradual commencement of large-scale subway construction in my country, the research and development of urban underground engineering construction technologies has become crucial. Shield tunneling, with its green and environmentally friendly characteristics, has attracted widespread attention. The long distances between stations in urban rail transit construction mean that the efficiency of shield tunneling directly impacts the construction cycle and the opening date. The amount of slag removed per ring increases exponentially compared to smaller diameter shields, drastically increasing the demands on internal logistics and transportation. Equipment power capabilities are being upgraded, and various parties are employing innovative methods to reduce costs and improve economic efficiency. The shield tunneling method has undergone decades of development, effectively controlling the stability of the tunneling face and surface deformation.

[0003] Timely discharge and control of the medium within the tunnel boring machine (TBM) soil chamber is a core issue in the TBM control system. To control the pressure of the excavated soil in the soil chamber for smooth circulation and maintain the stability of the tunneling face, the quality of the excavated soil improvement directly affects whether the TBM is operating normally. The main problem with intelligent mixing devices in the soil chamber of TBMs with interbedded sandstone and mudstone is that the complex geological conditions of these layers mean that existing mixing devices can only mix a single, fixed area. This results in a limited mixing range, low mud circulation rate, extended construction period, increased construction costs, and higher project risks. Utility Model Content

[0004] This utility model provides an intelligent mixing device for the soil chamber of a water-rich sand and mudstone interbedded shield tunneling machine, which solves the problems of limited mixing range and low mud circulation rate in the soil chamber, increases the range of rubber rods in the soil chamber, and improves the mud circulation rate.

[0005] This utility model is achieved through the following technical solution: A water-rich sandstone-mudstone interbedded shield tunneling machine soil chamber intelligent mixing device includes a soil chamber intelligent mixing device fixed along the shield tunneling machine axis, the soil chamber intelligent mixing device is connected to the shield tunneling machine control system, and the soil chamber intelligent mixing device includes a variable frequency motor, a telescopic rod, a transmission shaft and an active mixing device. The variable frequency motor is fixed on the rear side wall of the soil chamber. The output end of the variable frequency motor is connected to the telescopic rod. The front end of the telescopic rod is connected to the drive shaft. A mud baffle is installed at the front end of the drive shaft. Multiple active stirring devices are provided on the front side of the mud baffle. When there is a large amount of slag and soil accumulated in the soil chamber, the tunnel boring machine control system drives the telescopic rod to extend, increasing the mixing range.

[0006] Furthermore, a cylindrical transparent cover is fixed to the outside of the drive shaft, and the transparent cover is made of high-strength PVC material.

[0007] Furthermore, the telescopic rod is an electric push rod, the base of which is fixedly connected to the output end of the variable frequency motor, and the front end of the movable rod of the electric push rod is connected to the drive shaft through a coupling.

[0008] Furthermore, both the coupling and the drive shaft are made of Q345 steel.

[0009] Furthermore, a torque sensor is provided between the telescopic rod and the transmission rod.

[0010] Furthermore, the mudguard has holes equal in number to the active stirring device. The active stirring device includes a stirring shaft and a stirring motor. The stirring shaft is assembled in the holes via a ball bearing assembly. The front end of the stirring shaft has multiple circumferentially distributed active stirring arms, and the active stirring arms are provided with active stirring teeth.

[0011] Furthermore, an admixture port is provided on the rear side wall of the earthen chamber.

[0012] The beneficial effects achieved by this utility model compared with the prior art are as follows: (1) The design of the telescopic rod in this utility model controls the movement of the mud baffle plate back and forth, thereby ensuring that the active mixing device in the soil chamber can move freely, overcoming the problem that the existing mixing device can only mix a single fixed area and the mixing range is fixed, greatly improving the mud circulation rate, shortening the construction period, and reducing construction costs and engineering risks. (2) An admixture port is provided on the rear side wall of the soil chamber. The admixture port can be used to add slag soil improvement materials. With the addition of a stirring device that can move back and forth, the slag soil and slag soil improvement materials can be fully mixed evenly to prevent mud cake from forming. (3) By setting up a mudguard, this utility model can effectively prevent damage to the internal machinery of the tunnel boring machine if it encounters water-rich and high-pressure conditions during tunnel construction, thus effectively ensuring construction safety and rapid tunneling. (4) The active mixing device includes a mixing shaft and a mixing motor. The mixing shaft is assembled in the hole through a ball bearing assembly. The front end of the mixing shaft is provided with multiple circumferentially distributed active mixing arms. The active mixing arms are provided with active mixing teeth. The multiple active mixing devices are selected to operate in different quantities according to the different geological conditions of sand and mudstone interbedded layers, so as to ensure that the slag has good fluidity and improve the stratum excavation rate. Attached Figure Description

[0013] Figure 1 A schematic diagram of the intelligent mixing device for the soil chamber of a tunnel boring machine provided in this embodiment of the utility model; Figure 2 A schematic diagram of the working state of the active stirrer provided in this embodiment of the utility model; Figure 3 This is a schematic diagram of the earth pressure balance shield machine structure provided for an embodiment of the present utility model.

[0014] In the diagram: 1. Soil chamber, 2. Additive inlet, 3. Telescopic rod, 4. Variable frequency motor, 5. Active stirring device, 6. Mud baffle, 7. Coupling, 8. Ball bearing assembly, 9. Transparent cover, 10. Rubber seal, 11. Drive shaft, 12. Active stirring arm, 13. Active stirring teeth, 14. Intelligent sensor probe. Detailed Implementation

[0015] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0016] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0017] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship of the various parts or elements of this utility model and do not specifically refer to any part or element in this utility model. They should not be construed as limiting this utility model.

[0018] In this utility model, terms such as "fixed", "connected", and "linked" should be interpreted broadly, indicating that it can be a fixed connection, an integral connection, or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. For relevant scientific researchers or technicians in this field, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0019] This embodiment discloses an intelligent mixing device for the soil chamber of a water-rich sandstone-mudstone interbedded shield tunneling machine, such as... Figure 1 , Figure 2 , Figure 3As shown, the device includes an intelligent mixing device for the soil chamber, fixed along the axial direction of the tunnel boring machine (TBM). The intelligent mixing device is connected to the TBM control system and includes a variable frequency motor 4, a telescopic rod 3, a drive shaft 11, a transparent cover 9, and an active mixing device 5. In this embodiment, an admixture inlet 2 is provided on the rear side wall of the soil chamber 1 for adding soil amendment materials into the soil chamber 1.

[0020] A variable frequency motor 4 is fixed to the rear wall of the soil chamber 1. The output end of the variable frequency motor 4 is fixedly connected to the telescopic rod 3. The telescopic rod 3 is an electric push rod, which is driven by its own motor to extend and retract its movable rod. The movable rod can be a hexagonal / rectangular telescopic rod to effectively resist or transmit torque. The bottom of the base of the electric push rod is fixedly connected to the output end of the variable frequency motor 4. The front end of the movable rod of the electric push rod is connected to the drive shaft 11 through a coupling 7 and a torque sensor. A mudguard 6 is installed at the front end of the drive shaft 11, and the drive shaft 11 and the mudguard 6 are fixedly connected by rivets 8. Multiple active stirring devices 5 are installed on the front side of the mudguard 6.

[0021] The key to the intelligent mixing device of the shield machine soil chamber is to intelligently adjust the speed and number of rotations of the active mixing device 5 according to the turning slope and angle of the shield machine and the sand and mudstone interlayer. The geological conditions of the sand and mudstone interlayer can be divided into the following types: (1) According to the degree of weathering of the rock layer, it is divided into S1 strong weathered rock, the rock mass is divided into blocks by the joint fissures; most of the rock mass structure is destroyed, the structural bedding is not clear, and the mineral composition has changed significantly; the hammering sound is dull, the broken rock can be broken by hand, dry drilling is not easy to drill, and it can be excavated with a pickaxe; S2 weak weathered rock, the rock material is fresh, there are traces of iron and manganese along the joint surface or slight discoloration, there are a small amount of weathering traces, there is no loose material, and the mineral and rock structure has not changed much; (1) According to the sand and mudstone ratio, it is divided into S3 more sand and less mud, sand% mud%; S4 less sand and more mud, sand% mud%.

[0022] like Figure 1 As shown, a cylindrical transparent cover 9 is fixed to the outside of the drive shaft 11. The transparent cover 9 is made of high-strength PVC material to facilitate observation of the working status of the drive shaft. Flanges are fixed at both ends of the transparent cover 9, and rivet interfaces are provided on the flanges. The two ends of the transparent cover 9 are respectively installed on the mudguard 6 and the coupling 7 by means of rivets. The joints between the two ends of the transparent cover 9 and the drive shaft 11 are sealed with rubber sealing rings 10.

[0023] In this embodiment, both the coupling 7 and the drive shaft 11 are made of Q345 steel. The end of the drive shaft 11 is equipped with an intelligent sensing probe 14. The intelligent sensing probe 14 mainly includes conventional detection elements such as pressure sensors and image sensors. The pressure sensor measures soil pressure, and the image sensor measures soil composition. It can be used to intelligently identify the medium condition in the soil chamber, thereby facilitating the selective adjustment of the number of rotations and rotation speed of the active mixing device 5.

[0024] like Figure 2 As shown, the mudguard 6 has an equal number of holes as the active stirring devices 5. Each active stirring device includes a stirring shaft and a stirring motor. The stirring shaft is assembled in the hole via a ball bearing assembly 8. The front end of the stirring shaft has multiple circumferentially distributed active stirring arms 12, and each active stirring arm 12 has active stirring teeth 13 capable of stirring the slag. The stirring motor is installed on the rear side of the mudguard 6, and the output end of the stirring motor is connected to the rear end of the stirring shaft.

[0025] The specific working process of the intelligent mixing device for the soil chamber of the shield tunneling machine with interbedded water-rich sandstone and mudstone is as follows: When it is necessary to mix the excavated soil in the soil chamber, the variable frequency motor controls the mudguard to reciprocate within a 180° range (which can be set to 60° or 90° as needed) via the telescopic rod and drive shaft. Simultaneously, the intelligent sensor 14 intelligently identifies the medium conditions within the soil chamber and selectively adjusts the number and speed of the active mixing device 5. When the shield tunneling speed is 0-30 mm / min, the number of rotations of the active mixing device is 3; when the shield tunneling speed is 30 mm / min-50 mm / min, the number of rotations is 5. When the sandstone content is 0%-40%, the speed of the active mixer is 100-200 rpm; when the sandstone content is 40%-100%, the speed of the active mixer is 40-100 rpm.

[0026] The telescopic rod is driven by its own motor to extend and retract, controlling the forward and backward movement of the mud-blocking disc. This ensures that the active mixing device inside the soil chamber can move freely, allowing for thorough mixing within the chamber. This overcomes the limitations of existing mixing devices, which can only mix a single fixed area and have a fixed mixing range. It significantly improves the mud circulation rate, shortens the construction period, and reduces construction costs and project risks. Additives can be added through the admixture port, and the ability of the forward and backward-moving mixing device ensures thorough and uniform mixing of the excavated soil and the additives, preventing the formation of mud cakes.

Claims

1. An intelligent mixing device for the soil chamber of a water-rich sandstone-mudstone interbedded shield tunneling machine, characterized in that, The system includes an intelligent soil mixing device fixed along the axial direction of the tunnel boring machine (TBM). The intelligent soil mixing device is connected to the TBM control system and includes a variable frequency motor, a telescopic rod, a transmission shaft, and an active mixing device. The variable frequency motor is fixed on the rear side wall of the soil chamber. The output end of the variable frequency motor is connected to the telescopic rod. The front end of the telescopic rod is connected to the drive shaft. A mud baffle is installed at the front end of the drive shaft. Multiple active stirring devices are provided on the front side of the mud baffle. When the excavated soil accumulates in the soil chamber, the tunnel boring machine's control system drives the telescopic rod to extend, increasing the mixing range.

2. The intelligent mixing device for the soil chamber of a shield tunneling machine with interbedded water-rich sandstone and mudstone as described in claim 1, characterized in that, A cylindrical transparent cover made of high-strength PVC material is fixed to the outside of the drive shaft.

3. The intelligent mixing device for the soil chamber of a shield tunneling machine with interbedded water-rich sandstone and mudstone as described in claim 1, characterized in that, The telescopic rod is an electric push rod. The bottom of the base of the electric push rod is fixedly connected to the output end of the variable frequency motor, and the front end of the movable rod of the electric push rod is connected to the transmission shaft through a coupling.

4. The intelligent mixing device for the soil chamber of a shield tunneling machine with interbedded water-rich sandstone and mudstone as described in claim 3, characterized in that, Both the coupling and the drive shaft are made of Q345 steel.

5. The intelligent mixing device for the soil chamber of a shield tunneling machine with interbedded water-rich sandstone and mudstone as described in claim 1, characterized in that, A torque sensor is installed between the telescopic rod and the transmission rod.

6. The intelligent mixing device for the soil chamber of a shield tunneling machine with interbedded water-rich sandstone and mudstone as described in any one of claims 1-5, characterized in that, The mudguard has holes equal in number to the number of active stirring devices. The active stirring device includes a stirring shaft and a stirring motor. The stirring shaft is assembled in the holes via a ball bearing assembly. The front end of the stirring shaft has multiple circumferentially distributed active stirring arms, and the active stirring arms are provided with active stirring teeth.

7. The intelligent mixing device for the soil chamber of a shield tunneling machine with interbedded water-rich sandstone and mudstone as described in any one of claims 1-5, characterized in that, An admixture port is provided on the rear wall of the earthen silo.

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