Cutting part and excavator
By using a combination of double-row tapered roller bearings, thrust bearings, and roller bearings in the cutting section of the tunneling machine, the problem of easy damage to traditional tunneling machine bearings has been solved, and the axial force bearing capacity and equipment reliability have been improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SANY HEAVY EQUIP CO LTD
- Filing Date
- 2025-08-01
- Publication Date
- 2026-07-21
AI Technical Summary
In traditional tunneling machines, the main cutting bearings subjected to axial force are prone to damage or reduced lifespan, especially when the feed force exceeds the bearing's axial force limit.
The bearing assembly uses a combination of double-row tapered roller bearings, thrust bearings, and roller bearings. The thrust bearings are specifically designed to bear axial loads and prevent axial movement of the cutting spindle, while the roller bearings bear radial forces, enhancing the overall reliability of the machine.
It improves the axial force bearing capacity of the cutting section and the whole machine, prevents bearing damage, extends equipment life, and reduces maintenance costs.
Smart Images
Figure CN224532715U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of tunneling machine technology, specifically relating to a cutting section and a tunneling machine. Background Technology
[0002] Traditional tunneling machine cutting main bearings subjected to axial force are double-row roller bearings or paired angular contact ball bearings. When the tunneling machine is performing tunneling operations, it relies on the power provided by the hydraulic cylinders of the traveling section or telescopic section to perform forward feeding. When the feeding force exceeds the axial force limit of the bearing, it is easy to cause bearing damage or reduced life. Utility Model Content
[0003] The embodiments of this application are intended to at least improve one of the technical problems existing in the prior art or related art.
[0004] In view of this, the object of the embodiments of this application is to provide a cutting portion.
[0005] Another object of embodiments of this application is to provide a tunneling machine.
[0006] To achieve the above objectives, a cutting section is provided according to the first aspect of this application, comprising: a cutting spindle; a cutting head coaxially connected to one end of the cutting spindle; a cantilever cylinder sleeved on the cutting spindle; and a bearing assembly disposed between the cutting spindle and the cantilever cylinder, the bearing assembly comprising a double-row tapered roller bearing, a thrust bearing, and a roller bearing, the double-row tapered roller bearing, the thrust bearing, and the roller bearing being sequentially spaced apart along the direction away from the cutting head on the cutting spindle.
[0007] The cutting section provided in this application includes a cutting main shaft, a cutting head, a cantilever cylinder, and a bearing assembly. The cutting main shaft is the core transmission component of the cutting section of the tunneling machine, responsible for transmitting the motor torque to the cutting head, driving it to rotate to break coal and rock. The cantilever cylinder is sleeved outside the main shaft, supporting the rotation of the main shaft through the bearing assembly, and also bearing the bending moment during the cutting process. The bearing assembly is located between the cutting spindle and the cantilever cylinder. The bearing assembly includes double-row tapered roller bearings, thrust bearings, and roller bearings. The double-row tapered roller bearings, thrust bearings, and roller bearings are arranged sequentially and at intervals along the direction away from the cutting head of the cutting spindle. The double-row tapered roller bearings are closer to the cutting head end to increase axial freedom, so that all axial forces are applied to the thrust bearing. The thrust bearing is specifically designed to bear axial loads and prevent the cutting spindle from axially moving, thereby avoiding damage to the double-row tapered roller bearings caused by excessive axial force, improving the ability of the cutting part to withstand axial force, and thus improving the reliability of the whole machine. The roller bearings are farther away from the cutting head end and mainly bear radial force, which can help limit the swing of the cutting spindle.
[0008] In some technical solutions, optionally, the outer ring of the thrust bearing is located on the cantilever cylinder, and the inner ring of the thrust bearing is located on the cutting spindle.
[0009] In this technical solution, the outer ring of the thrust bearing is located on the cantilever cylinder, and the inner ring of the thrust bearing is located on the cutting spindle. By setting the thrust bearing between the cutting spindle and the cantilever cylinder, the ability of the cutting part to withstand axial force can be improved, thereby improving the reliability of the whole machine.
[0010] In some technical solutions, the cutting section may optionally include an oil seal, located between the cutting spindle and the cantilever cylinder, and on the side of the roller bearing away from the cutting head.
[0011] In this technical solution, the cutting section also includes an oil seal, which is located between the cutting spindle and the cantilever cylinder, and on the side of the roller bearing away from the cutting head, that is, at the junction of the cutting spindle and the cantilever cylinder, forming the last sealing barrier to prevent external coal dust and mud from entering the bearing cavity, while preventing internal lubricating grease from leaking.
[0012] In some technical solutions, the cutting section may optionally include a floating seal seat, which is sleeved on the cutting spindle and connected to one end of the cutting spindle and the cantilever cylinder, respectively.
[0013] In this technical solution, the cutting section also includes a floating seal seat, which is sleeved on the cutting main shaft and connected to one end of the cutting main shaft and the cantilever cylinder respectively to form a sealed cavity. By fixing the floating seal seat to the cantilever cylinder, the axial movement of the main shaft can be restricted, while bearing the propulsion reaction force of the cutting head.
[0014] In some technical solutions, the cutting section may optionally include a floating seal, disposed between the floating seal seat and the cutting spindle, and located on the side of the double-row tapered roller bearing near the cutting head.
[0015] In this technical solution, the cutting section also includes a floating seal. The floating seal is located between the floating seal seat and the cutting spindle, and is situated on the side of the double-row tapered roller bearing near the cutting head. When the spindle rotates, the elastic deformation of the floating seal compensates for axial and radial deviations, preventing coal dust and mud from entering the bearing cavity. The floating seal can also absorb vibrations and impacts during the operation of the cutting head, protecting the double-row tapered roller bearing from instantaneous overload.
[0016] In some technical solutions, the cutting section may optionally include a connector for connecting the floating seal seat and the cantilever cylinder.
[0017] In this technical solution, the cutting section also includes a connector for connecting the floating seal seat and the cantilever cylinder.
[0018] In some technical solutions, the connector may optionally include bolts.
[0019] In this technical solution, the connecting components include bolts. By fixing the floating seal seat and the cantilever cylinder with bolts, it can be ensured that the two do not undergo relative displacement during cutting vibration.
[0020] In some technical solutions, the roller bearing may optionally include a cylindrical roller bearing.
[0021] In this technical solution, the roller bearings include cylindrical roller bearings. The rollers and raceways of the cylindrical roller bearings are in line contact, which significantly improves their radial load capacity compared to ball bearings.
[0022] In some technical solutions, the cutting section may optionally include: multiple cutting teeth, which are located on the cutting head.
[0023] In this technical solution, the cutting section also includes multiple cutting teeth, which are located on the cutting head. Through impact, pressing and cutting, the teeth directly crush the coal or rock and remove it from the working face, thereby achieving efficient coal mining or tunnel excavation.
[0024] To achieve the second objective of this application, the technical solution of the second aspect of this application provides a tunneling machine, including: a cutting section as described in any of the technical solutions of the first aspect of this application.
[0025] The tunneling machine provided by the technical solution of this application includes a cutting section as described in any of the technical solutions in the first aspect of this application, and therefore has all the beneficial effects of the cutting section as described in any of the technical solutions in the first aspect of this application, which will not be repeated here.
[0026] Additional aspects and advantages of embodiments of this application will become apparent in the following description or may be learned by practice of embodiments of this application. Attached Figure Description
[0027] Figure 1 This is a cross-sectional structural diagram of the cut portion according to an embodiment provided in this application.
[0028] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows:
[0029] 10: Cutting section; 110: Cutting spindle; 120: Cutting head; 122: Cutting teeth; 130: Cantilever cylinder; 140: Bearing assembly; 142: Double row tapered roller bearing; 144: Thrust bearing; 146: Roller bearing; 150: Oil seal; 160: Floating seal seat; 170: Floating seal element; 180: Connecting element. Detailed Implementation
[0030] To better understand the above-mentioned objects, features, and advantages of the embodiments according to this application, the embodiments according to this application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the features of the embodiments according to this application can be combined with each other.
[0031] Numerous specific details are set forth in the following description in order to provide a full understanding of the embodiments according to this application. However, the embodiments according to this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection provided by the embodiments according to this application is not limited to the specific embodiments disclosed below.
[0032] The following reference Figure 1 Some embodiments provided in this application are described.
[0033] Traditional tunneling machine cutting main bearings subjected to axial force are double-row roller bearings or paired angular contact ball bearings. When the tunneling machine is performing tunneling operations, it relies on the power provided by the hydraulic cylinders of the traveling section or telescopic section to perform forward feeding. When the feeding force exceeds the axial force limit of the bearing, it is easy to cause bearing damage or reduced life.
[0034] like Figure 1 As shown, a cutting section 10 according to an embodiment of this application includes a cutting spindle 110, a cutting head 120, a cantilever cylinder 130, and a bearing assembly 140. Specifically, the cutting head 120 is coaxially connected to one end of the cutting spindle 110. The cantilever cylinder 130 is sleeved on the cutting spindle 110. The bearing assembly 140 is disposed between the cutting spindle 110 and the cantilever cylinder 130, and the bearing assembly 140 includes a double-row tapered roller bearing 142, a thrust bearing 144, and a roller bearing 146, which are arranged sequentially at intervals along the direction away from the cutting head 120 from the cutting spindle 110.
[0035] The cutting section 10 provided in this embodiment includes a cutting main shaft 110, a cutting head 120, a cantilever cylinder 130, and a bearing assembly 140. The cutting main shaft 110 is the core transmission component of the tunneling machine cutting section 10, responsible for transmitting the motor torque to the cutting head 120, driving it to rotate to break coal and rock. The cantilever cylinder 130 is sleeved on the outside of the main shaft, supporting the rotation of the main shaft through the bearing assembly 140, and also bearing the bending moment during the cutting process. The bearing assembly 140 is located between the cutting spindle 110 and the cantilever cylinder 130. The bearing assembly 140 includes a double-row tapered roller bearing 142, a thrust bearing 144, and a roller bearing 146. These bearings are arranged sequentially and at intervals along the direction away from the cutting head 120 from the cutting spindle 110. The double-row tapered roller bearing 142 is closer to the cutting head 120 end, increasing axial freedom and transferring all axial forces to the thrust bearing 144. The thrust bearing 144 specifically bears the axial load, preventing axial movement of the cutting spindle 110 and thus avoiding damage to the double-row tapered roller bearing 142 due to excessive axial force. This improves the ability of the cutting section 10 to withstand axial forces, thereby enhancing the overall reliability of the machine. The roller bearing 146, located away from the cutting head end, primarily bears radial forces and helps limit the oscillation of the cutting spindle 110.
[0036] In some embodiments, the outer ring of the thrust bearing 144 is optionally disposed on the cantilever cylinder 130, and the inner ring of the thrust bearing 144 is disposed on the cutting spindle 110, ensuring that the axial force is directly transmitted to the spindle. By providing the thrust bearing 144 between the cutting spindle 110 and the cantilever cylinder 130, the ability of the cutting part 10 to withstand axial force can be improved, thereby improving the reliability of the whole machine.
[0037] In some embodiments, the cutting section 10 may optionally include an oil seal 150, which is disposed between the cutting spindle 110 and the cantilever cylinder 130 and is located on the side of the roller bearing 146 away from the cutting head 120, i.e. at the junction of the cutting spindle 110 and the cantilever cylinder 130, forming a final sealing barrier to prevent external coal dust and mud from entering the bearing cavity, while preventing internal lubricating grease from leaking.
[0038] In some embodiments, the cutting section 10 may optionally include a floating sealing seat 160, which is sleeved on the cutting spindle 110 and connected to one end of the cutting spindle 110 and the cantilever cylinder 130 to form a sealed cavity. By fixing the floating sealing seat 160 to the cantilever cylinder 130, the axial movement of the spindle can be restricted, while bearing the pushing reaction force of the cutting head 120.
[0039] In some embodiments, the cutting section 10 may optionally include a floating seal 170, which is disposed between the floating seal seat 160 and the cutting spindle 110 and located on the side of the double-row tapered roller bearing 142 near the cutting head 120. When the spindle rotates, the elastic deformation of the floating seal 170 compensates for axial and radial deviations, preventing coal dust and mud from entering the bearing cavity. The floating seal 170 can also absorb the vibration and impact during the operation of the cutting head 120, protecting the double-row tapered roller bearing 142 from instantaneous overload.
[0040] In some embodiments, the cutting portion 10 may optionally include a connector 180 for connecting the floating sealing seat 160 and the cantilever cylinder 130.
[0041] In some embodiments, the connector 180 may optionally include bolts. By securing the floating seal 160 and the cantilever cylinder 130 with bolts, it is possible to ensure that the two do not undergo relative displacement during cutting vibrations.
[0042] In some embodiments, the roller bearing 146 may optionally include a cylindrical roller bearing 146, wherein the rollers of the cylindrical roller bearing 146 are in line contact with the raceway, and its radial load capacity is significantly improved compared to a ball bearing.
[0043] In some embodiments, the cutting section 10 may optionally include a plurality of cutting teeth 122, which are disposed on the cutting head 120 and directly crush coal or rock by means of impact, pressing and cutting, and strip it off from the working face, thereby achieving efficient coal mining or tunnel excavation.
[0044] An embodiment of the second aspect of this application provides a tunneling machine, including a cutting section 10 as described in any of the above embodiments.
[0045] The tunneling machine provided according to the embodiments of this application includes the cutting section 10 as described in any of the above embodiments, and thus has all the beneficial effects of the cutting section 10 as described in any of the above embodiments, which will not be repeated here.
[0046] like Figure 1 As shown, in a specific embodiment of the present application, the cutting section 10 has a thrust bearing 144 added to the cutting spindle 110 to improve the ability of the cutting section 10 to withstand axial force, thereby improving the reliability of the whole machine.
[0047] like Figure 1 As shown, the double-row tapered roller bearing 142 increases the axial degree of freedom, so that all axial forces are applied to the thrust bearing 144, thereby avoiding damage to the double-row tapered roller bearing 142 due to excessive axial force.
[0048] In summary, the beneficial effects of the embodiments of this application are as follows:
[0049] 1. Reduce the axial force on other bearings and improve equipment reliability.
[0050] 2. Lowering the strength requirements for bearings can reduce equipment maintenance costs.
[0051] In the embodiments according to this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments according to the specific circumstances.
[0052] In the description of the embodiments according to this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments according to this application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments according to this application.
[0053] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example according to this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0054] The above are merely preferred embodiments according to this application and are not intended to limit the embodiments according to this application. For those skilled in the art, various modifications and variations can be made to the embodiments according to this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments according to this application should be included within the protection scope of the embodiments according to this application.
Claims
1. A cutting assembly comprising: include: Cutting spindle (110); The cutting head (120) is coaxially connected to one end of the cutting spindle (110); A cantilever cylinder (130) is sleeved on the cutting spindle (110); A bearing assembly (140) is disposed between the cutting spindle (110) and the cantilever cylinder (130). The bearing assembly (140) includes a double-row tapered roller bearing (142), a thrust bearing (144), and a roller bearing (146). The double-row tapered roller bearing (142), the thrust bearing (144), and the roller bearing (146) are arranged sequentially at intervals along the direction away from the cutting head (120) of the cutting spindle (110).
2. The cutting portion according to claim 1, characterized in that, The outer ring of the thrust bearing (144) is disposed on the cantilever cylinder (130), and the inner ring of the thrust bearing (144) is disposed on the cutting spindle (110).
3. The cutting assembly of claim 1, wherein, Also includes: An oil seal (150) is disposed between the cutting spindle (110) and the cantilever cylinder (130), and is located on the side of the roller bearing (146) away from the cutting head (120).
4. The cutting assembly of claim 1, wherein, Also includes: A floating seal seat (160) is sleeved on the cutting spindle (110) and connected to one end of the cutting spindle (110) and the cantilever cylinder (130), respectively.
5. The cutting portion according to claim 4, characterized in that, Also includes: A floating seal (170) is disposed between the floating seal seat (160) and the cutting spindle (110), and is located on the side of the double-row tapered roller bearing (142) near the cutting head (120).
6. The cutting assembly of claim 4, wherein, Also includes: A connector (180) is used to connect the floating sealing seat (160) and the cantilever cylinder (130).
7. The cutting portion according to claim 6, characterized in that, The connector (180) includes bolts.
8. The cutting portion according to any one of claims 1 to 7, characterized in that, The roller bearing (146) includes a cylindrical roller bearing.
9. The cutting portion according to any one of claims 1 to 7, characterized in that, Also includes: Multiple cutting teeth (122) are provided on the cutting head (120).
10. A heading machine characterized by include: The cutting portion as described in any one of claims 1 to 9.