Shield machine cutterhead diameter reducing device

Abstract

This invention relates to a cutterhead diameter changing device for a tunnel boring machine (TBM), comprising a cutterhead body. The device is characterized in that the rolling cutter trajectory of the cutterhead body is a spiral; the outer ring between the panel and the edge scraper of the cutterhead body is disconnected; the panel and the ring rib of the cutterhead body are disconnected; the spokes of the cutterhead body are welded according to the dimensions after panel positioning, allowing for a smooth transition of the outer circle of the cutterhead body; all panels are radially increased by a first preset length; the outermost edge of the edge scraper of the cutterhead body forms an arc; the tearing blade on the panel is moved outward by a second preset length, and the spoke tearing blade is moved outward by a third preset length. The advantages of this invention are: 1. It achieves cutterhead diameter changing with similar diameters, saving raw materials. 2. It reduces product costs and shortens the development cycle of new cutterheads. 3. It can promote the serialization, modularization, and parametric design of TBM products.

Description

Technical Field

[0001] This invention relates to a cutterhead diameter changing device for a tunnel boring machine, belonging to the field of cutterheads. Background Technology

[0002] The common cutterhead diameter range for tunnel boring machines (TBMs) is 3-15m. In rail and subway construction, a diameter of around 6m is most commonly used. With a segment outer diameter of 6m, and considering the TBM construction process, the required cutterhead excavation diameter is 6.3m. With a segment diameter of 6.2m, and considering the TBM construction process, the required cutterhead excavation diameter is 6.5m. One segment diameter corresponds to one type of cutterhead, thus requiring two types of cutterheads (6m and 6.2m). The cost of manufacturing a new cutterhead is approximately 2 million RMB. The design and manufacturing cycle is six months, and some TBM cutterheads have only excavated four or five kilometers, far from reaching their service life. Therefore, modifying the cutterhead design for similar diameters is particularly important. This can save raw materials, reduce product costs, shorten the development cycle of new cutterheads, and promote the serialization, modularization, and parametric design of TBM products.

[0003] In soft rock shield tunneling, the excavation diameter is controlled by the radial dimensions of the cutterhead body and the cutting tools mounted on it. Regarding research on variable-diameter cutterheads, the most relevant work is the theoretical research on variable-diameter shield tunneling technology by Tang Yajun of China Railway 14th Bureau Group Co., Ltd., which only provides an overall overview of the various aspects involved in shield diameter variation. Li Jianbin of China Railway Tunnel Equipment Manufacturing Co., Ltd. achieved small-range diameter variation in soft rock shield tunnels, with a variation range of approximately 50mm, through a telescopic variable scraper design. It can be concluded that small-range cutterhead diameter variation can be achieved by replacing cutting tools, adjusting the cutter head height, and using a hydraulically controlled remote-controlled excavation cutter (diameter change within 100mm). Larger diameter variations using these methods result in severe wear on the cutterhead. However, research on diameter variation through modification of the cutterhead body itself has not yet emerged. Summary of the Invention

[0004] This invention enables the transformation of the cutterhead body to achieve cutterhead diameter variations with similar diameters, saving raw materials, reducing product costs, shortening the development cycle of new cutterheads, promoting the serialization, modularization, and parametric design of tunnel boring machine products, quickly meeting market demands, and saving raw materials.

[0005] This invention provides a tunnel boring machine cutterhead diameter changing device. The technical solution of this invention is as follows:

[0006] A tunnel boring machine cutterhead diameter changing device includes a cutterhead body with a spiral trajectory for the cutterhead body. The outer ring between the cutterhead body's panel and the edge scraper is disconnected; the cutterhead body's panel is disconnected from the ring rib; the spokes of the cutterhead body are welded according to the dimensions after panel positioning, so that the outer circle of the cutterhead body can smoothly transition; all panels are radially increased by a first preset length; the outermost edge of the cutterhead body's edge scraper forms an arc; the tearing blade on the panel is moved outward by a second preset length, and the spoke tearing blade is moved outward by a third preset length; after the center line of the spoke tearing blade is rotated clockwise or counterclockwise by a preset angle position, an annular block is welded in place.

[0007] The length values ​​of the first preset length, the second preset length, and the third preset length are all 100mm.

[0008] A single-edged hob and a double-edged hob are mounted on the cutter head body.

[0009] The single-edged hob is located at the 180° spoke of the cutter head body.

[0010] The advantages of this invention are:

[0011] 1. Achieve diameter variation of cutter heads with similar diameters, saving raw materials.

[0012] 2. Reduce product costs and shorten the development cycle of new cutter heads.

[0013] 3. It can promote the serialization, modularization, and parametric design of tunnel boring machine products. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of the present invention.

[0015] Figure 2 yes Figure 1 A schematic diagram of the structure of a medium-arc scraper. Implementation

[0016] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as a result. However, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solutions of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0017] See Figure 1 and Figure 2This invention relates to a tunnel boring machine cutterhead diameter changing device, comprising a cutterhead body 1, wherein the rolling trajectory of the cutterhead body 1 is a spiral (practice has proven that the spiral has strong rock-breaking and soil-breaking capabilities); the outer ring between the panel 3 and the edge scraper of the cutterhead body 1 is disconnected; the panel 3 and the ring rib 2 of the cutterhead body 1 are disconnected; the spokes of the cutterhead body 1 are welded according to the dimensions after the panel 3 is positioned, so that the outer circle of the cutterhead body 1 can be smoothly transitioned; all panels 3 are increased radially by a first preset length; the outermost edge of the edge scraper of the cutterhead body 1 forms an arc; the tearing blade on the panel is moved outward by a second preset length, and the spoke tearing blade is moved outward by a third preset length; after the center line of the spoke tearing blade is rotated clockwise or counterclockwise by a preset angle position, an annular block is welded in place.

[0018] The length values ​​of the first preset length, the second preset length, and the third preset length are all 100mm.

[0019] A single-edged hob and a double-edged hob are mounted on the cutter head body 1.

[0020] The single-edged hob is located at the 180° spoke of the cutter head body 1.

[0021] The working principle of the present invention is:

[0022] By incorporating this invention, two single-edged rolling cutters are added, and the trajectories of the rolling cutter, scraper, and tearing cutter are redesigned. Then, welding processes are used to ensure the rigidity and strength of the cutterhead. By varying the diameter of the cutterhead body, cutterheads of similar diameters can be made, saving raw materials, reducing product costs, shortening the development cycle of new cutterheads, and promoting the serialization, modularization, and parametric design of tunnel boring machine products.

[0023] By changing the diameter of the cutter head body, market demands can be quickly met, raw materials can be saved, product costs can be reduced, and the development cycle of new cutter heads can be shortened.

[0024] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A tunnel boring machine cutterhead diameter changing device, comprising a cutterhead body, characterized in that, The hobbing trajectory of the cutter head body is a spiral line. The outer ring between the panel and the edge scraper of the cutter head body is broken; the panel and the ring rib of the cutter head body are broken; the spokes of the cutter head body are welded according to the dimensions after the panel is positioned, so that the outer circle of the cutter head body can be smoothly transitioned; all panels are increased radially by a first preset length; the outermost edge of the edge scraper of the cutter head body forms an arc; the tearing blade on the panel is moved outward by a second preset length, and the spoke tearing blade is moved outward by a third preset length; after the center line of the spoke tearing blade is rotated clockwise or counterclockwise by a preset angle position, an annular block is welded in place. The length values ​​of the first preset length, the second preset length, and the third preset length are all 100mm; A single-edged hob and a double-edged hob are mounted on the cutter head body.

2. The shield tunneling machine cutterhead diameter changing device according to claim 1, characterized in that, The single-edged hob is located at the 180° spoke of the cutter head body.

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