Bolt screw sleeve lever type extractor for cutter head center cutter box of earth pressure shield tunneling machine

Abstract

The utility model relates to the technical field of shield tunneling, in particular to an earth pressure shield tunneling machine cutterhead center cutter box bolt thread sleeve lever type extractor which comprises a cylindrical thread sleeve support, an extractor lever is arranged on the lateral upper portion of the cylindrical thread sleeve support, and the front end of the extractor lever is connected with a lifting ring of a rotating lifting ring screw. The rotary lifting ring screw downwards penetrates through a round hole in the center of the top of the cylindrical screw sleeve bracket; according to the utility model, the rotary lifting ring screw above the cylindrical bracket is screwed into the central screw hole at the top end of the screw sleeve, and then the lever handle is pressed downwards by utilizing the lever principle, so that the screw sleeve moves until the screw sleeve is completely lifted out; the device has the advantages of being easy to operate, flexible to use, low in cost, high in efficiency and capable of preventing falling.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machine (TBM) technology, and in particular to a lever-type extractor for the bolt thread sleeve of the cutterhead center cutter box of an earth pressure shield machine. Background Technology

[0002] The cutterhead cutters of a tunnel boring machine (TBM) are one of the key components. The wear of the cutterhead cutters directly affects the tunneling efficiency of the TBM. In some complex geological formations, the cutters are prone to wear and often need to be inspected and replaced under high-pressure conditions.

[0003] Due to the high risks associated with pressurized tunneling operations, the inspection and replacement of cutterheads must be completed as quickly as possible. Because of the limited working space within the tunnel boring machine's chamber and the complexity of the central cutterhead structure, disassembly and installation are time-consuming, especially when encountering minor deformation of the cutterhead box, worn cutterhead bolts, or broken threads. Sometimes, it is also necessary to replace the threaded sleeves of the cutterhead box bolts. These operations, to some extent, affect the overall construction progress of the tunnel boring machine. To ensure both safety and timeliness, there is an urgent need for safer, more convenient, and faster tools for replacing threaded sleeves.

[0004] The most widely used tool in existing technology is to use a long screw and nut, relying on washers to slowly unscrew the threaded sleeve. Its disadvantages include: limited operating space in the cutter box; long operation time; and the tool is prone to slipping and being lost in the high-temperature and high-humidity environment of the tunnel boring machine. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a lever-type extractor for the bolt thread sleeve of the cutterhead center cutter box of an earth pressure shield machine.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An earth pressure shield tunneling machine cutterhead center cutter box bolt threaded lever type extractor includes a cylindrical threaded sleeve bracket, an extractor lever is provided on the upper side of the cylindrical threaded sleeve bracket, and a lifting eye of a rotating lifting eye screw is connected to the front end of the extractor lever. The rotating lifting eye screw passes downward through the circular hole in the center of the top of the cylindrical threaded sleeve bracket.

[0008] The cylindrical thread sleeve holder is placed vertically above the thread sleeve in the middle of the tool box wall, and the rotating eye screw is aligned with the center screw hole at the top of the thread sleeve.

[0009] Furthermore, in a preferred configuration, the ring of the rotating eyelet screw can rotate freely when connected to the front end of the extractor lever.

[0010] In addition, a preferred configuration is that the handle end of the extractor lever is provided with a safety hole for attaching a safety rope to prevent it from falling.

[0011] Furthermore, in a preferred configuration, the inner diameter of the cylindrical threaded sleeve support is larger than the diameter of the threaded sleeve.

[0012] Furthermore, in a preferred configuration, the rotating eye screw matches the threads of the central screw hole at the top of the threaded sleeve.

[0013] In addition, the preferred structure is that the entire material of the wire sleeve extractor is high-strength stainless steel, whose high strength and corrosion resistance are suitable for the high temperature and high humidity environment inside the tunneling chamber of the tunnel boring machine.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. The lever-type thread sleeve extractor of this utility model has a simple, convenient and ingenious structure, making the thread sleeve replacement operation safer, more convenient and faster.

[0016] 2. This utility model uses a rotating lifting eye screw on the top of a cylindrical bracket to screw into the center screw hole at the top of the threaded sleeve. Then, by using the lever principle, the lever handle is pressed down to displace the threaded sleeve until it is completely lifted out. This utility model has the characteristics of simple operation, flexible use, low cost, high efficiency, and preventing falling. Attached Figure Description

[0017] Figure 1 A schematic diagram showing the structure when a rotating eye bolt is screwed into a threaded insert;

[0018] Figure 2 This is a schematic diagram showing the structure when the bolt threaded sleeve is removed.

[0019] Figure 3 This is a schematic diagram of the working state of the central cutter box sleeve and cutter bolts of an earth pressure shield machine cutterhead.

[0020] Figure 4 A schematic diagram of the central cutter box threaded sleeve of an earth pressure shield tunneling machine;

[0021] Figure 5 A schematic diagram of the structure of the bolt sleeve extractor for the central cutter box of an earth pressure shield machine cutterhead;

[0022] In the diagram: 1. Extractor lever, 1-1. Safety hole, 2. Rotary eyelet screw, 3. Cylindrical threaded sleeve bracket, 4. Threaded sleeve, 41. Center screw hole at the top of the threaded sleeve, 42. Center tool box bolt hole, 5. Tool box wall, 6. Center tool bolt. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Reference Figure 1-5 An earth pressure shield machine cutterhead center cutter box bolt threaded lever type extractor includes a cylindrical threaded sleeve bracket 3, and an extractor lever 1 is provided on the upper side of the cylindrical threaded sleeve bracket 3.

[0025] A rotating eye screw 2 is connected to the front end of the extractor lever 1. The rotating eye screw 2 passes downward through the round hole in the center of the top of the cylindrical threaded sleeve bracket 3. The eye of the rotating eye screw 2 can rotate freely when connected to the front end of the extractor lever 1. The safety hole 1-1 at the handle end of the extractor lever 1 is used to attach a safety rope to prevent falling.

[0026] Furthermore, the inner diameter of the cylindrical threaded sleeve bracket 3 is slightly larger than the diameter of the threaded sleeve 4; and the rotating eye screw 2 matches the threads of the screw hole 41 at the top center of the threaded sleeve.

[0027] Among them, the wire sleeve extractor is made of high-strength stainless steel, and its high strength and corrosion resistance are suitable for the high temperature and high humidity environment inside the tunnel boring machine's tunneling chamber.

[0028] In this embodiment, when the lever-type extractor for the bolt thread sleeve of the center cutter box of the earth pressure shield machine is used, the center cutter bolt 6 is first removed from the cutter box and the center cutter box bolt hole 42 is rinsed with clean water; the threads of the thread sleeve at the top center screw hole 41 are rinsed until the threads are clean and free of impurities.

[0029] Then, tie the safety rope to the safety hole 1-1 of the handle of the extractor lever 1 and connect it to the fixed structure inside the work chamber, ensuring that it does not affect normal operation; place the cylindrical threaded sleeve bracket 3 of the bolt threaded sleeve extractor above the threaded sleeve 4 to be removed, and rotate the lifting eye screw 2 to align with the center screw hole 41 at the top of the threaded sleeve to be removed;

[0030] Tighten the rotating eye screw 2 into the center screw hole 41 at the top of the threaded sleeve until the extractor lever 1 reaches its lowest limit; the operator holds the cylindrical bracket 3 firmly with one hand and slowly applies pressure to the handle of the extractor lever 1 with the other hand, so that the threaded sleeve 4 moves outward until the threaded sleeve 4 is pulled out of the threaded sleeve hole.

[0031] The extractor is made of high-strength stainless steel, and its high strength and corrosion resistance make it suitable for the high-temperature and high-humidity environment inside the tunnel boring machine's excavation chamber.

[0032] This utility model uses a rotating lifting screw 2 on the top of a cylindrical bracket 3 to screw into the central screw hole 41 at the top of the threaded sleeve. Then, by using the lever principle, pressure is applied downward to the handle of the extractor lever 1 to displace the threaded sleeve 4 until it is completely removed. This utility model is characterized by simple operation, flexible use, low cost, high efficiency, and prevention of falling.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A lever-type extractor for the bolted sleeve of the cutterhead center cutter box of an earth pressure shield machine, comprising a cylindrical sleeve support (3), characterized in that, The cylindrical thread sleeve bracket (3) is provided with an extractor lever (1) on its upper side. The front end of the extractor lever (1) is connected to the ring of the rotating eye screw (2). The rotating eye screw (2) passes downward through the round hole in the center of the top of the cylindrical thread sleeve bracket (3). The cylindrical thread sleeve bracket (3) is placed vertically above the replacement thread sleeve (4) in the middle of the tool box wall (5), and the rotating eye screw (2) is aligned with the center screw hole (41) on the top of the thread sleeve (4).

2. The lever-type extractor with threaded bolt sleeve for the center cutter box of an earth pressure shield machine according to claim 1, characterized in that, The ring of the rotating eyelet screw (2) can rotate freely when connected to the front end of the extractor lever (1).

3. The lever-type extractor with threaded bolt sleeve for the center cutter box of an earth pressure shield machine according to claim 1, characterized in that, The handle end of the extractor lever (1) is provided with a safety hole (1-1), which is used to attach a safety rope to prevent falling.

4. The lever-type extractor with threaded bolt sleeve for the center cutter box of an earth pressure shield machine according to claim 1, characterized in that, The inner diameter of the cylindrical wire sleeve bracket (3) is larger than the diameter of the wire sleeve (4).

5. The lever-type extractor with threaded bolt sleeve for the center cutter box of an earth pressure shield machine according to claim 1, characterized in that, The rotating eye screw (2) matches the threads of the screw hole (41) at the top center of the threaded sleeve.

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