Compound cutter head and small diameter tunneling machine

Abstract

The application provides a combined cutter head and a small-diameter tunneling machine. The combined cutter head comprises a cutter head body, a pipeline arm group arranged on a non-working surface side of the cutter head body, and each pipeline arm group being communicated with the cutter head body; a tool changing channel movable element arranged on a side of the pipeline arm group away from the cutter head body, the tool changing channel movable element being communicated with the pipeline arm group and a rotary joint to form a closed cavity isolated from a soil tank, and used for isolating the soil tank from a rear part of a partition plate. The small-diameter tunneling machine comprises a cutter head, a shield body, a main drive arranged in the shield body and located at a circumferential edge position of the shield body, and a screw machine arranged at a bottom of the shield body and used for conveying out spoil. The combined cutter head and the small-diameter tunneling machine provided by the application can be adapted to a geological condition of an unstable front working face or a project needing to be excavated in a pressure balance state.

Description

Technical Field

[0001] This application relates to the technical field of tunneling equipment, and more particularly to a composite cutterhead and a small-diameter tunneling machine. Background Technology

[0002] With the continuous acceleration of urban construction, there is an increasing number of underground gas pipelines being laid, underground sewage projects being constructed, and power and water conservancy pipelines being built or renovated. Small-diameter tunneling machines have advantages such as safety, reliability, high construction efficiency, and minimal impact on the surrounding environment, making them a popular choice for construction equipment in many engineering projects.

[0003] The shield body has vertical partitions inside, and a soil chamber is formed between the partitions and the cutterhead. A rotary joint is installed in the middle of the partitions, and various pipelines for soil improvement are arranged inside the rotary joint. In other words, the rotary joint connects the soil chamber with the space behind the shield body partitions, and the soil chamber is not sealed.

[0004] For complex or hard rock geology, pressure-maintaining tunneling is required when conducting fully enclosed tunneling. However, when encountering unstable geological conditions at the tunnel face or projects that require tunneling in a state of pressure balance, the soil chamber is not enclosed, making it difficult for the soil chamber to stabilize the tunnel face or maintain a state of pressure balance during the tunneling process through the cutterhead. Summary of the Invention

[0005] This application provides a composite cutterhead and a small-diameter tunneling machine that isolates the soil chamber from the space behind the shield body partition, making the soil chamber a closed space, which can adapt to unstable geology at the front face or projects that need to be tunneled in a state of maintaining pressure balance.

[0006] In a first aspect, this application provides a composite cutter head, comprising:

[0007] Cutterhead body;

[0008] Pipeline arm assembly is disposed on the non-working surface side of the cutter head body, and all pipeline arm assemblies are connected to the cutter head body;

[0009] A tool changing channel movable component is disposed on the side of the pipeline arm assembly opposite to the cutter head body. The tool changing channel movable component is connected to the end of the pipeline arm assembly opposite to the cutter head body. The tool changing channel movable component is used to connect with a rotary joint.

[0010] The pipeline arm assembly, the cutter change channel movable component, and the rotary joint (500) together form a closed cavity that is isolated from the soil chamber of the small-diameter tunneling machine. The closed cavity is located inside the soil chamber and is used to isolate the rear part of the partition (120) of the small-diameter tunneling machine from the soil chamber.

[0011] In one of the above-mentioned optional technical solutions for a composite cutter head, the movable component of the tool changing channel includes a tool changing channel cylinder, a rear cover plate, and a front cover plate;

[0012] Both ends of the tool changing channel cylinder are open, and the cylinder body of the tool changing channel cylinder is connected to the pipeline arm assembly;

[0013] The rear cover plate is detachably and sealed to the end of the tool changing channel cylinder that is away from the tool disc body;

[0014] The front cover plate is detachably and sealed to the end of the tool changing channel cylinder facing the tool disc body.

[0015] In one of the above-mentioned optional technical solutions for a composite cutter head, the tool changing channel cylinder is configured as a regular polygon or a cylinder.

[0016] In one of the above-mentioned optional technical solutions for a composite cutter head, the pipeline arm assembly includes multiple pipeline arms, each pipeline arm having its two ends connected to the cutter head body and the tool changing channel cylinder, respectively, and all the pipeline arms are evenly distributed circumferentially about the axis of the tool changing channel cylinder.

[0017] In one of the above-mentioned optional technical solutions for a composite cutter head, the position where the cutter changing channel cylinder connects to the pipeline arm is set as a planar boss.

[0018] In one of the above-mentioned optional technical solutions for a composite cutter head, the end of the pipeline arm used to connect with the tool changing channel cylinder is provided with a limiting groove, and the cylinder body of the tool changing channel cylinder is fixedly locked inside the limiting groove.

[0019] In one of the above-mentioned optional technical solutions for a composite cutter head, sealing rings are provided between the joints of the tool changing channel cylinder and the rear cover plate and the front cover plate, as well as between the joint of the tool changing channel cylinder and the pipeline arm.

[0020] In one of the above-mentioned optional technical solutions for a composite cutter head, the working surface of the cutter head body is provided with a plurality of circumferentially distributed cutter head steel components, each of which is provided with a plurality of rolling cutters, cutting blades and edge scrapers; each of the cutter head steel components is also provided with a pipeline channel, and each of the pipeline channels is connected to a corresponding pipeline arm.

[0021] Secondly, this application provides a small-diameter tunneling machine, comprising:

[0022] shield;

[0023] The main drive is located inside the shield body, at the circumferential edge of the shield body;

[0024] A rotary joint is located inside the shield body, at the center of the shield body's radial direction;

[0025] Also includes:

[0026] In the aforementioned composite cutter head body, the rotary joint is connected to the movable component of the tool changing channel.

[0027] In one of the above-mentioned optional technical solutions for a small-diameter tunneling machine, the rotary joint includes a stator and a rotor that are rotatably connected to each other;

[0028] The shield body has a vertically arranged partition plate located on the side of the rear cover plate. The partition plate has a through hole for the rotor to pass through. The side of the partition plate opposite to the rear cover plate has a connecting flange, and the stator is fixedly connected to the connecting flange.

[0029] The rear cover plate has a connection hole for connecting with the rotor. The rotor passes through the connection hole and is fixedly connected to the rear cover plate. The rotor is in communication with the inside of the tool changing channel cylinder.

[0030] This application provides a composite cutterhead and a small-diameter tunneling machine. By setting a pipeline arm assembly and a cutter change channel movable component on the non-working face side of the cutterhead body, the rotary joint, the cutter change channel movable component and the pipeline arm assembly form a closed cavity and are combined with the shield body partition to isolate the soil chamber from the rear of the shield body. During tunneling, the soil chamber, in turn, applies pressure to the tunnel face through the cutterhead body, realizing pressure-maintaining tunneling. At the same time, the tunneling process can also be carried out in a state of maintaining pressure balance.

[0031] The pipe arm assembly and the cutterhead changing channel can serve as a transport channel for various pipelines (hydraulic oil pipelines, foam liquid pipelines, water pipes, etc.). Before cutting, grout or bentonite is injected into the working face through the cutterhead body to temporarily stabilize the working face and prevent collapse. After disconnecting the cutterhead changing channel from the rotary joint, the pipe arm assembly and the cutterhead changing channel can also serve as a cutterhead changing channel for operators. Operators can enter and exit the soil chamber of the tunneling machine through the pipe arm assembly and the cutterhead changing channel to carry out cutter replacement operations. The pipe arm assembly and the cutterhead changing channel achieve a dual technical effect.

[0032] This application provides a composite cutterhead and a small-diameter tunneling machine. First, the rotary joint, the movable part of the cutter change channel, and the pipeline arm assembly form a closed cavity, which, combined with the shield body partition, isolates the soil chamber from the rear of the shield body. During tunneling, the soil chamber, in turn, applies pressure to the tunnel face through the cutterhead body, achieving pressure-maintaining tunneling. At the same time, the tunneling process can also be carried out in a state of maintaining pressure balance. Second, the pipeline arm assembly and the movable part of the cutter change channel can provide a smooth cutter change channel to meet the needs of cutter change for long-distance tunneling. Third, the main drive is arranged on the circumferential edge of the shield body. The enlarged main drive can also provide a sufficiently large driving force. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0034] Figure 1 This is a schematic diagram of a composite cutter head provided in an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the structure of a small-diameter tunneling machine provided in an embodiment of this application;

[0036] Figure 3 A schematic diagram of the assembly structure of the tool changing channel movable component and pipeline arm assembly in a composite tool head provided in this application embodiment;

[0037] Figure 4 A front view of a movable component of a tool changing channel in a composite tool turret, provided as an embodiment of this application;

[0038] Figure 5 for Figure 4 Sectional view along the AA direction.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100-shield;

[0041] 110 - Main drive;

[0042] 120-partition;

[0043] 130 - Connecting flange;

[0044] 200-Cutterhead body;

[0045] 210 - Cutterhead steel component;

[0046] 220-Hoop cutter;

[0047] 230 - Cutting blade;

[0048] 240 - Edge scraper;

[0049] 250 - Pipeline access;

[0050] 300-pipeline arm assembly;

[0051] 310 - Pipe arm;

[0052] 400 - Tool changer channel moving part;

[0053] 410 - Tool changer channel cylinder;

[0054] 420 - Rear cover;

[0055] 421 - Connection hole;

[0056] 430 - Front cover;

[0057] 500-rotary joint;

[0058] 600-Screw Conveyor.

[0059] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0060] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0061] Terminology Explanation: The tunnel face, also known as the working face, is a term used in tunnel construction. It refers to the working face that is continuously advanced during the excavation of tunnels (in coal mining, mining, or tunnel engineering).

[0062] As described in the background section, with the continuous acceleration of urban construction, there is an increasing number of underground gas pipelines being laid, underground sewage projects being constructed, and power and water conservancy pipelines being built or renovated. Small-diameter tunneling machines have advantages such as safety, reliability, high construction efficiency, and minimal impact on the surrounding environment, making them a popular choice for construction equipment in many engineering projects.

[0063] For complex or hard rock geology, the main drive diameter is increased and an open tunneling method is adopted. The central area serves as a muck removal channel and a passage for workers to enter and exit. However, existing small-diameter tunneling machines are difficult to adapt to unstable geology at the face or projects that require tunneling in a state of pressure balance.

[0064] To address the aforementioned technical problems, this application provides a composite cutterhead and a small-diameter tunneling machine. By installing a pipe arm assembly and a cutter change channel movable component on the non-working face side of the cutterhead body, firstly, the rotary joint, the cutter change channel movable component, and the pipe arm assembly form a closed cavity, which, combined with the shield body partition, isolates the soil chamber from the rear of the shield body. During tunneling, the soil chamber, in turn, applies pressure to the tunnel face through the cutterhead body, achieving pressure-maintaining tunneling. Simultaneously, the tunneling process can maintain a pressure balance. Secondly, the pipe arm assembly and the cutter change channel movable component provide a smooth cutter change channel to meet the needs of long-distance tunneling cutter changes. Thirdly, the main drive is arranged at the circumferential edge of the shield body; the increased main drive size can provide sufficiently large driving force.

[0065] The technical solution of this application and how it solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The following will be combined with the appendix... Figure 1-5 The embodiments of this application will be described below.

[0066] Figure 1 This is a schematic diagram of a composite cutter head provided in an embodiment of this application. Figure 2 This is a structural schematic diagram of a small-diameter tunneling machine provided in an embodiment of this application. Figure 3 This is a schematic diagram of the assembly structure of the movable component of the tool changing channel and the pipeline arm assembly in a composite tool head, provided in an embodiment of this application. Figure 4 This is a front view of a movable component in a tool changing channel of a composite tool turret, provided in an embodiment of this application. Figure 5 for Figure 4 Sectional view along the AA direction.

[0067] Please refer to Figure 1 This application provides a composite cutter head, including: a cutter head body 200, the working surface of which is provided with a plurality of circumferentially distributed cutter head steel components 210. In this embodiment, as shown... Figure 1 As shown, three cutter head steel components 210 are provided. Each cutter head steel component 210 is equipped with multiple roller cutters 220, cutting blades 230, and edge scrapers 240. The roller cutters 220 are installed on the front of the cutter head steel component 210, the cutting blades 230 are installed on both sides of the cutter head steel component 210, and the edge scrapers 240 are installed on both sides of the cutter head steel component 210 and located at the edge of the cutter head body 200. Each cutter head steel component 210 is also provided with a pipe channel 250, which is installed on the front of the cutter head steel component 210.

[0068] Please refer to Figure 2In some embodiments provided in this application, exemplarily, a pipeline arm assembly 300 is connected to the non-working side of the cutterhead body 200, and all pipeline arm assemblies 300 are in communication with the cutterhead body 200. A tool change channel movable component 400 is provided on the side of the pipeline arm assembly 300 opposite to the cutterhead body 200, and the tool change channel movable component 400 is in communication with the pipeline arm assembly 300. Various pipelines are provided within the tool change channel movable component 400 and the pipeline arm assembly 300, including hydraulic oil pipelines, foam liquid pipelines, water pipelines, etc. The tool change channel movable component 400 and the pipeline arm assembly 300 form a whole, used to connect to the partition 120 inside the small-diameter tunneling machine, separating the soil chamber from the rear part of the small-diameter tunneling machine.

[0069] Specifically, the rotary joint 500, the cutterhead channel movable part 400 and the pipeline arm assembly 300 form a closed cavity and are combined with the shield body 100 partition plate 120 to isolate the soil chamber from the rear of the shield body 100. During tunneling, the soil chamber, in turn, applies pressure to the tunnel face through the cutterhead body 200, realizing pressure-maintaining tunneling. At the same time, the tunneling process can also be carried out in a state of maintaining pressure balance.

[0070] The pipeline arm assembly 300 can serve as a conveying channel for various pipelines, and can also mix the soil excavated by the cutter head body 200, reducing the possibility of mud cake forming in the middle of the cutter head body 200.

[0071] Before cutting tool replacement, grout or bentonite is injected into the tunnel face through the cutterhead body 200 to temporarily stabilize the tunnel face and prevent collapse. After disconnecting the cutting tool replacement channel movable part 400 from the rotary joint 500, the pipeline arm assembly 300 and the cutting tool replacement channel movable part 400 can also serve as a cutting tool replacement channel for operators. Operators can enter and exit the soil chamber of the tunneling machine through the pipeline arm assembly 300 and the cutting tool replacement channel movable part 400 to carry out cutting tool replacement operations. The pipeline arm assembly 300 and the cutting tool replacement channel movable part 400 achieve a dual technical effect.

[0072] Please refer to Figure 3 , Figure 4 and Figure 5 In some embodiments provided in this application, the tool changer movable component 400, exemplarily, includes a tool changer cylinder 410, a rear cover plate 420, and a front cover plate 430. Both ends of the tool changer cylinder 410 are open, and the cylinder body of the tool changer cylinder 410 is connected to the pipeline arm assembly 300. The rear cover plate 420 is detachably and sealed to the end of the tool changer cylinder 410 facing away from the cutter head body 200 by bolts. The front cover plate 430 is detachably and sealed to the end of the tool changer cylinder 410 facing the cutter head body 200 by bolts. The tool changer cylinder 410 can be configured as a regular polygon to facilitate operator movement inside the tool changer cylinder 410. Alternatively, the tool changer cylinder 410 can be configured as a cylinder to make it easier to manufacture.

[0073] Please refer to Figure 2 and Figure 3 In some embodiments provided in this application, the pipeline arm assembly 300 exemplarily includes a plurality of pipeline arms 310. In this embodiment, for example... Figure 3 As shown, the pipeline arm assembly 300 includes three pipeline arms 310. The two ends of each pipeline arm 310 are connected to the cutter head body 200 and the tool changing channel cylinder 410, respectively. All pipeline arms 310 are evenly distributed circumferentially about the axis of the tool changing channel cylinder 410. Each pipeline channel 250 is connected to the corresponding pipeline arm 310.

[0074] Please refer to Figure 3 In some embodiments provided in this application, for example, the position where the tool change channel cylinder 410 connects to the pipeline arm 310 is set as a planar boss, which can ensure the tightness of the connection between the tool change channel cylinder 410 and the pipeline arm 310.

[0075] In some embodiments provided in this application, for example, the end of the pipeline arm 310 that connects to the tool change channel cylinder 410 is provided with an annular limiting groove, and the cylinder body of the tool change channel cylinder 410 is fixedly engaged inside the limiting groove. Specifically, this structure can further strengthen the connection between the pipeline arm 310 and the tool change channel cylinder 410.

[0076] Please refer to Figure 2 In some embodiments provided in this application, sealing rings are provided, exemplarily, between the joints of the tool changing channel cylinder 410 and the rear cover plate 420 and the front cover plate 430, and between the tool changing channel cylinder 410 and the pipeline arm 310. Specifically, the sealing rings enhance the sealing performance between the tool changing channel cylinder 410 and the rear cover plate 420 and the front cover plate 430, and also enhance the sealing performance between the tool changing channel cylinder 410 and the pipeline arm 310.

[0077] Please refer to Figure 2 This application also provides a small-diameter tunneling machine, including: a shield body 100, a main drive 110 disposed inside the shield body 100, the main drive 110 being located at the circumferential edge of the shield body 100 and at the top of the shield body 100. A rotary joint 500 is disposed inside the shield body 100, the rotary joint 500 being located at the radial center of the shield body 100. The small-diameter tunneling machine also includes the aforementioned composite cutterhead body 200, and the rotary joint 500 is connected to the cutter change channel movable component 400.

[0078] Please refer to Figure 2 and Figure 5In some embodiments provided in this application, the rotary joint 500 includes a stator and a rotor that are rotatably connected to each other; a partition 120 is vertically fixedly connected inside the shield body 100, the partition 120 is located on this side of the rear cover plate 420, the partition 120 has a through hole for the rotor to pass through, and a connecting flange 130 is integrally formed on the side of the partition 120 away from the rear cover plate 420, the stator and the connecting flange 130 are fixedly connected by bolts; a connecting hole 421 for connecting with the rotor is opened on the rear cover plate 420, the rotor passes through the connecting hole 421 and is fixedly connected with the rear cover plate 420 by bolts, and the rotor communicates with the inside of the cutter changing channel cylinder 410.

[0079] Please refer to Figure 2 Inside the shield body 100, there is also a screw conveyor 600. The screw conveyor 600 is set at an inclination, and the feed end of the screw conveyor 600 is located inside the soil chamber. The feed end of the screw conveyor 600 is the lowest.

[0080] In summary, the composite cutterhead and small-diameter tunneling machine provided in this application, firstly, the rotary joint 500, the cutter change channel movable part 400 and the pipeline arm assembly 300 form a closed cavity and are combined with the shield body 100 partition plate 120 to isolate the soil chamber from the rear of the shield body 100. During tunneling, the soil chamber, in turn, applies pressure to the tunnel face through the cutterhead body 200, realizing pressure-maintaining tunneling. At the same time, the tunneling process can also be carried out in a state of maintaining pressure balance.

[0081] Secondly, the pipe arm assembly 300 and the cutterhead changing channel movable part 400 can serve as a conveying channel for various pipelines (hydraulic oil pipelines, foam liquid pipelines, water pipes, etc.). Before cutting, grout or bentonite is injected into the working face through the cutterhead body 200 to temporarily stabilize the working face and prevent collapse. After disconnecting the connection between the cutterhead changing channel movable part 400 and the rotary joint 500, the pipe arm assembly 300 and the cutterhead changing channel movable part 400 can also serve as a cutterhead changing channel for operators. Operators can enter and exit the soil chamber of the tunneling machine through the pipe arm assembly 300 and the cutterhead changing channel movable part 400 to carry out cutterhead changing operations. The pipe arm assembly 300 and the cutterhead changing channel movable part 400 achieve a dual technical effect.

[0082] Third, the main drive 110 is arranged around the circumferential edge of the shield body 100. The enlargement of the main drive 110 can also provide a sufficiently large driving force.

[0083] Other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the technical solutions disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0084] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A composite cutter head, characterized in that, include: Cutterhead body (200); Pipe arm assembly (300) is disposed on the non-working side of the cutter head body (200), and the pipe arm assembly (300) is connected to the cutter head body (200); A tool change channel movable component (400) is disposed on the side of the pipeline arm assembly (300) away from the cutter head body (200). The tool change channel movable component (400) is connected to the end of the pipeline arm assembly (300) away from the cutter head body (200). The tool change channel movable component (400) is used to communicate with a rotary joint (500). The pipeline arm assembly (300), the cutter change channel movable part (400), and the rotary joint (500) together form a closed cavity that is isolated from the soil chamber of the small diameter tunneling machine. The closed cavity is located inside the soil chamber and is used to isolate the rear part of the partition (120) of the small diameter tunneling machine from the soil chamber. The tool change channel movable component (400) includes a tool change channel cylinder (410), a rear cover plate (420), and a front cover plate (430); Both ends of the tool changing channel cylinder (410) are open, and the cylinder body of the tool changing channel cylinder (410) is connected to the pipeline arm assembly (300); The rear cover plate (420) and the end of the tool changing channel cylinder (410) opposite to the tool disc body (200) are detachably and sealed together. The front cover plate (430) and the end of the tool changing channel cylinder (410) facing the tool disc body (200) are detachably and sealingly connected; The pipeline arm assembly (300) includes multiple pipeline arms (310), each pipeline arm (310) having its two ends connected to the cutter head body (200) and the tool changing channel cylinder (410) respectively, and all the pipeline arms (310) are evenly distributed circumferentially about the axis of the tool changing channel cylinder (410).

2. The composite cutter head according to claim 1, characterized in that, The tool change channel cylinder (410) is configured as a regular polygon or a cylinder.

3. A composite cutter head according to claim 1, characterized in that, The position where the tool change channel cylinder (410) connects to the pipeline arm (310) is set as a planar boss.

4. A composite cutter head according to claim 1, characterized in that, The end of the pipeline arm (310) that is connected to the tool change channel cylinder (410) is provided with a limiting groove, and the cylinder body of the tool change channel cylinder (410) is fixedly locked inside the limiting groove.

5. A composite cutter head according to claim 1, characterized in that, Sealing rings are provided between the joints of the tool changing channel cylinder (410) and the rear cover plate (420), the front cover plate (430), and between the joint of the tool changing channel cylinder (410) and the pipeline arm (310).

6. A composite cutter head according to claim 1, characterized in that, The working surface of the cutter head body (200) is provided with a plurality of circumferentially distributed cutter head steel components (210), each of the cutter head steel components (210) being provided with a plurality of hobbing cutters (220), cutting cutters (230) and edge scrapers (240); each of the cutter head steel components (210) is also provided with a pipeline channel (250), each of the pipeline channels (250) being connected to the corresponding pipeline arm (310).

7. A small-diameter tunneling machine, characterized in that, include: Shield(100); The main drive (110) is disposed inside the shield body (100) and located at the circumferential edge of the shield body (100); A rotary joint (500) is disposed inside the shield body (100) and located in the radial center of the shield body (100); Also includes: A composite cutter head according to any one of claims 1-6, wherein the rotary joint (500) is connected to the tool changing channel movable part (400).

8. A small-diameter tunneling machine according to claim 7, characterized in that, The rotary joint (500) includes a stator and a rotor that are rotatably connected to each other; The shield body (100) has a vertically arranged partition (120) inside. The partition (120) is located on the side of the rear cover plate (420). The partition (120) has a through hole for the rotor to pass through. The side of the partition (120) away from the rear cover plate (420) has a connecting flange (130). The stator is fixedly connected to the connecting flange (130). The rear cover plate (420) has a connection hole (421) for connecting with the rotor. The rotor passes through the connection hole (421) and is fixedly connected to the rear cover plate (420). The rotor is in communication with the inside of the tool changing channel cylinder (410).

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