Cutting mechanism and heading machine

Abstract

The embodiment of the utility model provides a cutting mechanism and a heading machine, and relates to the technical field of underground heading equipment. Wherein the cutting mechanism comprises a cutting speed reducer, a cutting roller and a sealing assembly, the cutting speed reducer comprises a main shaft and a rack, and the main shaft rotates relative to the rack; the cutting roller sleeves the main shaft and synchronously rotates with the main shaft; the cutting roller, the rack and the main shaft jointly define a mounting cavity; the sealing assembly is arranged in the mounting cavity, the sealing assembly comprises a floating sealing piece, a dustproof sealing piece and two sealing seats, the two sealing seats are arranged on the opposite faces of the main shaft and the rack respectively and are arranged on the floating sealing piece, a channel assembly is formed between the sealing seats and the cutting roller, the dustproof sealing piece is arranged in the channel assembly, and the dustproof sealing piece is arranged in the channel assembly. The dustproof sealing piece is used for preventing impurities from moving to the floating sealing piece from the interior of the channel assembly, the sealing effect is enhanced, and the situation that dust enters the floating sealing piece to cause abrasion or function failure is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground tunneling equipment, and particularly relates to a cutting mechanism and a tunneling machine. BACKGROUND

[0002] The tunneling machine is a heavy mechanical equipment used for tunneling and underground engineering construction, mainly used for tunneling and excavating underground space in mines, subways, railways, highways and water conservancy projects. The cutting mechanism as a core component of the tunneling machine is crucial to avoid cutting dust from entering the inside of the tunneling machine during the tunneling process and improve the service life.

[0003] In the related art, the cutting mechanism includes a cutting reducer, a cutting drum and a sealing structure. The cutting drum is sleeved on the main shaft of the cutting reducer and rotates relative to the frame of the cutting reducer for cutting. The sealing structure includes a floating seal and two floating seal seats. The main shaft and the frame are connected through the floating seal. The two floating seal seats are arranged on the floating seal, and the two floating seal seats are connected with the main shaft and the frame respectively. At the same time, the two floating seal seats are riveted to each other to prevent dust and oil gas from the outside from entering the inside of the cutting part.

[0004] However, the two floating seal seats will rotate relatively to adaptively compensate the displacement, and a gap will be left between the two floating seal seats, so that the dust from the outside is easy to enter the floating seal through the gap, the sealing effect is poor, and the floating seal is damaged. Invention content

[0005] The cutting mechanism and the tunneling machine provided by the embodiments of the present application can overcome the problem in the prior art that the two floating seal seats will rotate relatively to adaptively compensate the displacement, a certain gap will be left between the two floating seal seats, the dust from the outside is easy to enter the floating seal through the gap, the sealing effect is poor, and the floating seal is damaged.

[0006] In a first aspect, the embodiments of the present application provide a cutting mechanism, which comprises: a cutting reducer, the cutting reducer comprising a main shaft and a frame, the main shaft rotating relative to the frame; a cutting drum, the cutting drum being sleeved on the main shaft and synchronously rotating with the main shaft, the cutting drum, the frame and the main shaft collectively forming an installation cavity; and a sealing assembly, the sealing assembly being arranged in the installation cavity, the sealing assembly comprising a floating seal, a dustproof seal and two sealing seats, the two sealing seats being arranged on opposite surfaces of the main shaft and the frame respectively, and the two sealing seats being arranged on the floating seal, a channel assembly being formed between the sealing seats and the cutting drum, the dustproof seal being arranged in the channel assembly, and the dustproof seal being used to prevent impurities from moving from the channel assembly to the floating seal.

[0007] In a possible implementation, the channel assembly comprises a first channel and a second channel, the first channel is formed between opposite surfaces of the two sealing seats, the second channel is formed between one of the two sealing seats and the inner wall of the cutting drum, the first channel is in communication with the floating seal, and the dustproof seal is arranged in at least one of the first channel and the second channel.

[0008] In a possible implementation, the two sealing seats are respectively a first sealing seat and a second sealing seat, the first sealing seat is connected to the main shaft, the second sealing seat is connected to the rack, and the second channel is formed between the second sealing seat and the cutting drum.

[0009] In a possible implementation, an outer surface of at least one of the first sealing seat and the second sealing seat has an annular positioning groove, the dustproof seal is arranged in the annular positioning groove, and a top end of the dustproof seal protrudes from the outer surface of the first sealing seat and the second sealing seat to block the opening and closing of the channel assembly.

[0010] In a possible implementation, the dustproof seal is arranged in at least two, a connecting piece is arranged between adjacent dustproof seals, the connecting piece has an oil channel between the two dustproof seals, and the oil channel is filled with a lubricant.

[0011] In a possible implementation, at least one observation hole is arranged on the cutting drum, and the observation hole corresponds to the oil channel.

[0012] In a possible implementation, the dustproof seal is a one-way seal, and the dustproof seal allows one-way flow from the first channel to the second channel.

[0013] In a possible implementation, opposite surfaces of one of the first sealing seat and the second sealing seat have an annular groove, the other of the first sealing seat and the second sealing seat is fitted into the annular groove, and the first sealing seat and the second sealing seat are clearance-fitted to form the first channel.

[0014] In a possible implementation, the floating seal comprises a floating seal ring and a sealing ring, the floating seal ring has a sealing gap, the sealing ring is mounted in the sealing gap, and the sealing ring is in contact with the two sealing seats.

[0015] In a second aspect, the embodiments of the present application provide a tunneling machine, comprising a cutting head, a cutting arm, and any of the cutting mechanisms provided in the first aspect, the cutting head is connected to the cutting drum of the cutting mechanism, and the cutting arm is connected to the rack of the cutting mechanism.

[0016] The cutting mechanism and the tunneling machine provided by the embodiment of the application, wherein the cutting mechanism is provided with a dustproof sealing piece in the channel assembly, in the process of synchronous rotation of the cutting drum and the main shaft for cutting, cutting dust impurities enter the channel assembly and move towards the direction of the floating sealing piece, and can be blocked by the dustproof sealing piece, thereby enhancing the sealing effect and avoiding wear or functional failure of the floating sealing piece due to dust entering. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings incorporated by reference in the specification and forming a part of the specification, show embodiments consistent with the present application, and together with the specification serve to explain the principles of the present application.

[0018] Figure 1 The structural schematic diagram of the cutting mechanism provided by the application is shown in the figure.

[0019] Figure 2 The detailed enlarged sectional view of the cutting mechanism provided by the application is shown in the figure. Figure 1

[0020] Explanation of reference signs:

[0021] 100 - cutting reduction machine; 110 - main shaft; 120 - rack; 200 - cutting drum; 300 - sealing assembly; 310 - floating sealing piece; 311 - floating sealing ring; 312 - sealing ring; 320 - dustproof sealing piece; 330 - sealing seat; 331 - first sealing piece; 332 - second sealing piece; 400 - channel assembly; 410 - first channel; 420 - second channel; 500 - connecting piece; 600 - oil channel; 700 - annular groove.

[0022] In order to facilitate the understanding of the scheme of the embodiment of the application, the spline curve and the arrow used in the reference signs in the drawings are explained here: the component indicated by the spline curve without the arrow can be a solid component, i.e. a component with a solid structure; the component indicated by the spline curve with the arrow can be a virtual component, i.e. a component without a solid structure; in some cases, the component indicated by the spline curve with the arrow can also be an assembly with a solid structure or a virtual structure.

[0023] Through the above drawings, the specific embodiments of the application have been shown, and more detailed descriptions will be given hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the application by any means, but to illustrate the concept of the application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0024] ​The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless the context clearly dictates otherwise. The following description is not intended to represent all embodiments in accordance with the present application. Rather, they merely represent typical embodiments in accordance with a portion of the application, as detailed in the appended claims.

[0025] The terms "first", "second", "third", etc. (if any) in the description, claims, and drawings of the present application, and the above-described terms "inner", "outer", "first direction", "second direction", etc. are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0026] Secondly, it should be noted that in the description of the present application, the terms "inner", "outer", "first direction", "second direction", etc. indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or member must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0027] In addition, it should be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] As shown in the background, in the related art, the cutting mechanism includes a cutting reducer, a cutting drum and a sealing structure. The cutting drum is sleeved on the main shaft of the cutting reducer and rotates relative to the frame of the cutting reducer to cut. The sealing structure includes a floating seal and two floating seal seats. The main shaft and the frame are connected through the floating seal. The two floating seal seats are arranged on the floating seal, and the two floating seal seats are connected with the main shaft and the frame respectively. At the same time, the two floating seal seats are riveted to each other to avoid dust and oil gas from the outside entering the inside of the cutting part.

[0029] However, the two floating seal seats will rotate relative to each other to adapt to displacement compensation. A gap will be left between the two floating seal seats, which will cause dust from the outside to easily enter the floating seal through the gap, resulting in poor sealing effect and further damage to the floating seal.

[0030] To solve the above technical problems, the embodiment of the present application provides a cutting mechanism and a heading machine. The cutting mechanism comprises a cutting speed reducer, a cutting drum and a sealing assembly. The cutting speed reducer comprises a main shaft and a rack. The main shaft rotates relative to the rack. The cutting drum is sleeved on the main shaft and rotates synchronously with the main shaft. The cutting drum, the rack and the main shaft jointly enclose a mounting cavity. The sealing assembly is arranged in the mounting cavity. The sealing assembly comprises a floating sealing piece, a dustproof sealing piece and two sealing seats. The two sealing seats are arranged on opposite surfaces of the main shaft and the rack respectively, and are arranged on the floating sealing piece. A channel assembly is formed between the sealing seat and the cutting drum. The dustproof sealing piece is arranged in the channel assembly. The dustproof sealing piece is used to prevent impurities from moving from the channel assembly to the floating sealing piece, thereby enhancing the sealing effect and avoiding wear or functional failure of the floating sealing piece due to dust entering. The heading machine comprises a cutting head, a cutting arm and the above cutting mechanism. The cutting head is connected to the cutting drum. The cutting arm is connected to the rack. The cutting drum rotates to drive the cutting head to rotate, so as to rotateally cut and excavate the tunnel. The cutting direction is controlled by the cutting arm.

[0031] The technical solutions of the present application and how the technical solutions solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other. The same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0032] In a first aspect, the embodiment of the present application provides a cutting mechanism, which refers to Figure 1 and Figure 2 The cutting mechanism comprises a cutting speed reducer 100, a cutting drum 200 and a sealing assembly 300. The cutting speed reducer 100 comprises a main shaft 110 and a rack 120. The main shaft 110 rotates relative to the rack 120.

[0033] The cutting drum 200 is sleeved on the main shaft 110 and rotates synchronously with the main shaft 110. The cutting drum 200, the rack 120 and the main shaft 110 jointly enclose a mounting cavity.

[0034] The sealing assembly 300 is arranged in the mounting cavity. The sealing assembly 300 comprises a floating sealing piece 310, a dustproof sealing piece 320 and two sealing seats 330. The two sealing seats 330 are arranged on opposite surfaces of the main shaft 110 and the rack 120 respectively, and are arranged on the floating sealing piece 310. A channel assembly 400 is formed between the sealing seat 330 and the cutting drum 200. The dustproof sealing piece 320 is arranged in the channel assembly 400. The dustproof sealing piece 320 is used to prevent impurities from moving from the channel assembly 400 to the floating sealing piece 310.

[0035] It can be understood that a tunneling machine comprises a cutting head, a cutting arm and any one of the cutting mechanisms provided in the first aspect, the cutting head is connected to the cutting drum 200 of the cutting mechanism, and the cutting arm is connected to the rack 120 of the cutting mechanism.

[0036] The main shaft 110 of the cutting reduction machine is rotatably connected with the rack 120, that is, the main shaft 110 can rotate relative to the rack 120, thereby driving the cutting drum 200 to rotate synchronously, and the cutting head is sleeved outside the cutting drum 200. The cutting teeth can be arranged on the outer circumferential surface of the cutting head. Under the driving of the main shaft 110 of the cutting reduction machine, the cutting head can rotate to cut the tunnel rock and coal mine. The cutting part has the functions of stretching and swinging, has high flexibility and freedom, and can drive the cutting head to swing to different cutting angles under different working conditions, can cope with complex underground working conditions, and improves the tunneling efficiency.

[0037] During the tunneling of the tunnel coal mine by the tunneling machine, a large amount of dust and impurities will be generated, and because the tunnel coal mine is relatively hard, the cutting head and the cutting drum will be subjected to a large recoil force during cutting. There is a gap (passage assembly 400) between the cutting drum 200 and the sealing seat 330, and impurities can easily enter the floating seal 310 through the passage assembly 400.

[0038] Therefore, in combination with Figure 1 and Figure 2 It is shown that the cutting mechanism sets the dustproof seal 320 in the passage assembly 400. During synchronous rotation of the cutting drum 200 and the main shaft 110 for cutting, cutting dust and impurities enter the passage assembly 400 and move towards the floating seal 310. When the dustproof seal 320 is blocked, the sealing effect is enhanced, and the floating seal 310 is prevented from being worn or functionally disabled due to the entry of dust.

[0039] In one possible implementation, referring to Figure 2 It is shown that the passage assembly 400 comprises a first passage 410 and a second passage 420. The first passage 410 is formed between the opposite surfaces of the two sealing seats 330, and the second passage 420 is formed between one of the two sealing seats 330 and the inner wall of the cutting drum 200. The first passage 410 is in communication with the floating seal 310, and the dustproof seal 320 is arranged in at least one of the first passage 410 and the second passage 420.

[0040] It can be understood that, referring to Figure 2As shown, two sealing seats 330 are arranged on opposite surfaces of the spindle 110 and the frame 120 respectively, and the spindle 110 rotates relative to the frame 120, so that one of the two sealing seats 330 can rotate synchronously. In order to avoid friction between the two sealing seats 330, a gap is required between the two sealing seats 330 to form a first channel 410. In addition, the cutting drum 200 rotates synchronously with the spindle 110, so that in order to avoid wear between the cutting drum 200 and the sealing seat 330, one of the two sealing seats 330 needs to be gap-fitted with the inner wall of the cutting drum 200 to form a second channel 420. Therefore, in order to prevent impurities from entering the floating seal 310 through the second channel 420 and then entering the first channel 410, a dustproof seal 320 can be arranged in at least one of the first channel 410 and the second channel 420.

[0041] Further, the dustproof seal 320 can be arranged in the second channel 420 to block the impurities from entering and prevent the impurities from entering the floating seal 310.

[0042] In addition, in a possible implementation manner, as shown in Figure 2 The two sealing seats 330 are respectively a first seal 331 and a second seal 332, the first seal 331 is connected to the spindle 110, the second seal 332 is connected to the frame 120, and the second channel 420 is formed between the second seal 332 and the cutting drum 200.

[0043] Specifically, referring to Figure 2 The first seal 331 is connected to the spindle 110 and can rotate synchronously under the driving of the spindle 110, and the second seal 332 is fixedly connected to the frame 120. The cutting drum 200 can be sleeved outside the relatively fixed second seal 332, and the second channel 420 can be formed between the second seal 332 and the cutting drum 200 to avoid sliding friction therebetween.

[0044] Of course, in other implementation manners, the first seal 331 and the cutting drum 200 can also be arranged to form the second channel 420, without specific limitation. However, in order to facilitate assembly, it is preferred that the cutting drum 200 is sleeved outside the relatively fixed second seal 332, and the second channel 420 is formed between the second seal 332 and the cutting drum 200.

[0045] In the embodiment, as shown in Figure 2As shown, the first seal 331 can be connected to the spindle 110 via a first fastener, and the second seal 332 can be connected to the frame 120 via a second fastener. Both the first and second fasteners can be bolts. Of course, in other embodiments, the first and second fasteners can also be pins, etc., as long as it ensures that the two sealing seats 330 can be securely connected to the spindle 110 and the frame 120 respectively. In addition, the connection between the first seal 331 and the spindle 110, and the connection between the second seal 332 and the frame 120, can also be fixed by welding or other methods, without specific limitations.

[0046] Among them, such as Figure 2 As shown, at least one of the first seal 331 and the second seal 332 has an annular positioning groove on its outer surface. The dustproof seal 320 is disposed in the annular positioning groove, and the top end of the dustproof seal 320 protrudes from the outer surface of the first seal 331 and the second seal 332 to block the channel assembly 400.

[0047] Specifically, such as Figure 2 As shown, an annular positioning groove can be formed on the second seal 332, and the dustproof seal 320 is installed in the annular positioning groove and fits against the cutting roller 200 to block the opening and closing of the second channel 420; of course, an annular positioning groove can also be formed on the first seal 331, or an annular positioning groove can also be formed on the opposite surface of the second seal 332 and the first seal 331, and the dustproof seal 320 is installed in the annular positioning groove and fits against the first seal 331 or the second seal 332 to block the first channel 410.

[0048] In one possible implementation, combining Figure 2 As shown, at least two dustproof seals 320 are provided, and a connector 500 is provided between adjacent dustproof seals 320. An oil passage 600 is provided between the connector 500 and the two dustproof seals 320, and the oil passage 600 is filled with lubricant.

[0049] Specifically, such as Figure 2 As shown, at least two dustproof seals 320 can be provided to enhance the sealing effect and prevent kerosene, dust, and other impurities from passing through. The two sides of the connector 500 respectively abut against two adjacent dustproof seals 320 to fix the dustproof seals 320 and prevent them from moving or misaligning, which would affect the sealing effect. (Refer to...) Figure 2 As shown, the height of the connector 500 is lower than the height of the dust seal 320, that is, the connector 500 and the two adjacent dust seals 320 together form an oil passage 600, which can be filled with lubricant to further prevent impurities from entering.

[0050] Lubricant can be added manually or by opening an oil channel on the sealing seat 330 with an annular positioning groove and adding lubricant into the oil channel through an oil pump, thereby delivering the lubricant into the oil channel 600. The specific addition method can be adjusted according to the actual working conditions and is not subject to specific restrictions.

[0051] Furthermore, the lubricant can be butter or other lubricating oil.

[0052] In one possible implementation, the cutting roller 200 is provided with at least one observation hole, which corresponds to the oil passage 600. This arrangement allows for observation of whether the oil level has been reached when lubricant is added to the oil passage 600, preventing overfilling. Furthermore, the observation hole allows for monitoring the movement of the lubricant within the oil passage 600, ensuring that any impurities entering the channel assembly 400 are detected promptly and preventing them from entering the floating seal 310, which could lead to wear and seal failure.

[0053] The observation hole is equipped with a transparent observation window, which seals the observation hole, allowing the lubricant in the oil passage 600 to flow out through the observation hole.

[0054] In one possible implementation, the dust seal 320 is a one-way seal that allows one-way flow from the first channel 410 toward the second channel 420.

[0055] Understandably, the dust seal 320 can be a one-way seal, allowing only unidirectional flow from the first channel 410 to the second channel 420. This prevents external dust and impurities from entering the first channel 410 through the second channel 420, thus avoiding damage to the floating seal 310. Furthermore, the lubricant in the oil passage 600 can be discharged through the dust seal 320 to the second channel 420, thereby removing impurities from the second channel 420 during the discharge process, further enhancing the sealing effect.

[0056] And, as Figure 2 As shown, the opposite surfaces of one of the first seal 331 and the second seal 332 have an annular groove 700, and the other of the first seal 331 and the second seal 332 is assembled into the annular groove 700, and the first seal 331 and the second seal 332 are clearance-fitted to form a first channel 410.

[0057] Specifically, one of the first seal 331 and the second seal 332 can have an annular groove 700 on the opposite surface, and the other of the first seal 331 and the second seal 332 is smaller than the size of the annular groove 700, so that the first seal 331 and the second seal 332 can be fitted with a clearance fit, facilitating the synchronous rotation of the seal seat 330 connected with the main shaft 110, and avoiding the sliding friction damage between the first seal 331 and the second seal 332. The gap between the first seal 331 and the second seal 332 can be the first channel 410.

[0058] In one possible implementation, as shown in Figure 2 The floating seal 310 includes a floating seal ring 311 and a sealing ring 312. The floating seal ring 311 has a sealing gap, and the sealing ring 312 is installed in the sealing gap and abuts against the two seal seats 330.

[0059] Specifically, in combination with ​ As shown in the figure, the floating seal ring 311 can be provided with two, one of which is installed below the first seal 331, and the other of which is installed below the second seal 332. Both floating seal rings 311 are provided with sealing gaps, and the two sealing gaps have mutually symmetrical inclined pressure surfaces. The lower part of the two seal seats 330 is respectively provided with a groove matched with the two sealing gaps, and the two grooves form two accommodating cavities with the two sealing gaps. The sealing ring 312 can be provided with two, which are respectively installed in the two accommodating cavities and abut against the seal seat 330 and the floating seal ring 311, so as to ensure that the sealing ring 312 will not fall off from the floating seal ring 311.

[0060] The sealing ring 312 can be a rubber ring, which can play the role of sealing and elastic compensation, and ensure that the sealing ring 312 can always maintain close contact with the first seal 331 when the first seal 331 connected with the main shaft 110 rotates. Of course, in other embodiments, the sealing ring 312 can also be made of other elastic materials, as long as it can play the role of sealing and elastic compensation.

[0061] Finally, it should be noted that other embodiments of the application will be readily apparent to those skilled in the art upon considering the description and practice of the application disclosed herein. The application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the application pertains and encompasses. The scope of the application is limited only by the claims that follow, and equivalents thereof.

Claims

1. A cutting mechanism, characterized in that, include: A cutting reducer (100) includes a main shaft (110) and a frame (120), the main shaft (110) rotating relative to the frame (120); A cutting roller (200) is sleeved on the main shaft (110) and rotates synchronously with the main shaft (110). The cutting roller (200), the frame (120), and the main shaft (110) together form an installation cavity. A sealing assembly (300) is disposed within the mounting cavity. The sealing assembly (300) includes a floating seal (310), a dustproof seal (320), and two sealing seats (330). The two sealing seats (330) are respectively disposed on the opposite surfaces of the main shaft (110) and the frame (120), and the two sealing seats (330) are disposed on the floating seal (310). A channel assembly (400) is formed between the sealing seat (330) and the cutting roller (200). The dustproof seal (320) is disposed within the channel assembly (400) and is used to prevent impurities from moving from the channel assembly (400) to the floating seal (310).

2. The cutting mechanism according to claim 1, characterized in that, The channel assembly (400) includes a first channel (410) and a second channel (420). The first channel (410) is formed between the opposing surfaces of the two sealing seats (330), and the second channel (420) is formed between one of the two sealing seats (330) and the inner wall of the cutting roller (200). The first channel (410) communicates with the floating seal (310), and the dustproof seal (320) is disposed in at least one of the first channel (410) and the second channel (420).

3. The cutting mechanism according to claim 2, characterized in that, The two sealing seats (330) are a first sealing element (331) and a second sealing element (332), respectively. The first sealing element (331) is connected to the main shaft (110), and the second sealing element (332) is connected to the frame (120). The second sealing element (332) and the cutting drum (200) form the second channel (420).

4. The cutting mechanism according to claim 3, characterized in that, At least one of the first seal (331) and the second seal (332) has an annular positioning groove on its outer surface. The dustproof seal (320) is disposed in the annular positioning groove. The top end of the dustproof seal (320) protrudes from the outer surfaces of the first seal (331) and the second seal (332) to block the opening and closing of the channel assembly (400).

5. The cutting mechanism according to claim 4, characterized in that, At least two dustproof seals (320) are provided, and a connector (500) is provided between adjacent dustproof seals (320). An oil passage (600) is provided between the connector (500) and the two dustproof seals (320), and the oil passage (600) is filled with lubricant.

6. The cutting mechanism according to claim 5, characterized in that, At least one observation hole is provided on the cutting drum (200), and the observation hole corresponds to the oil passage (600).

7. The cutting mechanism according to claim 2, characterized in that, The dustproof seal (320) is a one-way seal that allows one-way flow from the first channel (410) toward the second channel (420).

8. The cutting mechanism according to claim 4, characterized in that, One of the first seal (331) and the second seal (332) has an annular groove (700) on its opposite surface. The other of the first seal (331) and the second seal (332) is fitted into the annular groove (700), and the first seal (331) and the second seal (332) are clearance-fitted to form the first channel (410).

9. The cutting mechanism according to any one of claims 1-8, characterized in that, The floating seal (310) includes a floating sealing ring (311) and a sealing ring (312). The floating sealing ring (311) has a sealing notch, and the sealing ring (312) is installed in the sealing notch and fits against the two sealing seats (330).

10. A tunneling machine, characterized in that, It includes a cutting head, a cutting arm, and a cutting mechanism according to any one of claims 1-9, wherein the cutting head is connected to the cutting drum (200) of the cutting mechanism, and the cutting arm is connected to the frame (120) of the cutting mechanism.

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