A boom supported segmental roadheader cutting device
Patent Information
- Application Number
- CN202522539265.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-10-20
- Estimated Expiration
- 2035-11-28
AI Technical Summary
[0003]然而，受结构限制，装载机构位于截割头后部，无法及时清理巷道迎头，掘进机截割过程中产生的煤岩物料在巷道底部易堆积
本装置采用悬臂支撑分段式结构，依次设置主轴、悬臂段和截割头，悬臂段内筒和外筒通过两个轴承转动连接，主轴与截割头花键连接带动其旋转，内筒独立于主轴旋转并与固定端连接。通过内筒固定和外筒旋转的设计，减少了悬臂段主轴的弯矩和扭矩的叠加效应；通过后置独立的润滑油路，保证了供油稳定和人员安全；这种结构使得截割装置各部分分工明确，结构紧凑合理，便于安装、维护，提高了截割装置整体的工作稳定性和可靠性，能够更好地适应掘进作业环境。
Smart Images
Figure CN224871266U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mining equipment technology, specifically to a cantilevered segmented tunneling machine cutting device. Background Technology
[0002] Currently, tunnel boring machines (TBMs) are mainly used for tunneling in coal mines. Their cutting section, driven by lifting and rotating hydraulic cylinders, can swing up and down and left and right. The cantilever section and cutting head, as the core cutting components, are located at the front end of the cutting section. The cutting head is bolted to the outside of the cantilever section. After the cutting motor drives the cutting reducer to reduce speed and increase torque, the torque is transmitted to the cutting head via the main shaft of the cantilever section. The cutting teeth mounted on the cutting head break up the coal and rock during rotation and swinging.
[0003] However, due to structural limitations, the loading mechanism is located at the rear of the cutting head, making it impossible to clear the roadway face in a timely manner. Coal and rock materials generated during the cutting process tend to accumulate at the bottom of the roadway. When cutting lower coal and rock, because the cutting head is short, the entire head rotates inside the material, and the guide plate can only reach the last cutting tooth at the tail end of the cutting head, causing material to accumulate at the tail. The large diameter and high linear velocity at the tail end of the cutting head make the tooth seats extremely prone to wear and breakage. This wear gradually extends to the front end, eventually leading to the scrapping of the cutting head. Furthermore, the short cutting head cannot prevent bottom plate material from entering the interior through the gap between the tail and the cantilever section. Long-term wear of coal and rock particles on the edge of the cantilever section's outer cylinder and seals causes seal failure and oil leakage. The cantilever section and cutting head are not integrated; the cutting head needs to wrap around the cantilever section and leave a rotational clearance, resulting in an increased diameter and reduced rock-breaking capacity. The main shaft, as the main load-bearing component, must withstand torque, bending moment, and the load connecting the cantilever and cutting head; its complex shape makes it difficult to manufacture. The distance between the two bearing discs in the cantilever section is relatively large, and the swing amplitude is large during tunneling, which can easily cause damage to the bearings and seals on one side due to poor lubrication. Utility Model Content
[0004] To address existing problems, this utility model provides a cantilever-supported segmented tunneling machine cutting device. Through a design that fixes the inner cylinder and rotates the outer cylinder, the cumulative effect of bending moment and torque on the main shaft of the cantilever section is reduced. A rear-mounted independent lubrication circuit ensures stable oil supply and personnel safety. A spiral guide plate on the outer wall rotates with the main shaft, discharging material as the cutting head advances, effectively reducing material accumulation and cutting head wear. O-rings are installed at the beginning and end of the gap between the protective cylinder and the outer cylinder, and at the junction of the cutting head and the outer cylinder, to prevent coal and rock from entering and maintain a seal. A floating oil seal is located at the tail of the cantilever section, away from material accumulation areas, extending its service life. The integrated design of the outer cylinder and the cutting head reduces the cutting head diameter and increases cutting force. The overall structure optimizes the shortcomings of traditional tunneling machine cutting devices, improving rock-breaking efficiency and equipment durability.
[0005] To achieve the above objectives, the present invention provides the following technical solution.
[0006] This utility model provides a cantilever-supported segmented tunneling machine cutting device, which sequentially includes a main shaft connected to the power input, a cantilever section, and a cutting head. The cantilever section includes an inner cylinder and an outer cylinder. The main shaft is disposed inside the inner cylinder, and the inner cylinder is disposed inside the outer cylinder. The inner cylinder and the outer cylinder are rotatably connected by bearings. The main shaft is splinedly connected to the cutting head, and the rotation of the main shaft drives the cutting head. The inner cylinder is connected to the fixed end of the tunneling machine, and the movement or stillness of the inner cylinder is independent of the rotation of the main shaft. The cutting head is connected to the outer cylinder by screws, and the outer cylinder rotates with the rotation of the main shaft.
[0007] As a further improvement of this utility model, the inner cylinder is provided with a first lubricating oil passage and a second lubricating oil passage that are independent of each other, for lubricating the first bearing and the second bearing, respectively.
[0008] As a further improvement of this utility model, the opening of the first lubricating oil passage is located on the side of the inner cylinder away from the cutting head, and a first oil filling plug is provided at the opening; the opening of the second lubricating oil passage is located on the side of the inner cylinder away from the cutting head, and a second oil filling plug is provided at the opening; the first lubricating oil passage and the second lubricating oil passage are 180° apart along the circumference of the inner cylinder.
[0009] As a further improvement of this utility model, the cutting head includes a cutting head body, a tooth seat provided on the cutting head body, cutting teeth provided on the tooth seat, and a protective cylinder connected to the tail of the cutting head body; the protective cylinder is sleeved on the outer wall of the outer cylinder.
[0010] As a further improvement of this utility model, a spiral guide plate is provided on the outer wall of the protective cylinder.
[0011] As a further improvement of this utility model, a groove is formed in the body of the cutting head, and a spring is provided in the groove. The spring is used to axially limit the spindle.
[0012] As a further improvement of this utility model, O-rings are provided at both ends of the gap between the protective cylinder and the outer cylinder; the tail of the cutting head body is fitted with the inner edge of the outer cylinder, and an O-ring is provided at the fitting point.
[0013] As a further improvement of this utility model, a reducer is axially connected to the tail of the inner cylinder, and the reducer is splinedly connected to the main shaft.
[0014] As a further improvement of this utility model, oil seals are provided on both sides of the first bearing and the second bearing along the axial direction of the outer cylinder.
[0015] As a further improvement of this utility model, the oil seal on the side of the first bearing near the tail of the inner cylinder is a floating oil seal.
[0016] Compared with the prior art, the present invention has the following beneficial effects: This device adopts a cantilevered segmented structure, with the main shaft, cantilever section, and cutting head arranged sequentially. The inner and outer cylinders of the cantilever section are rotatably connected by two bearings. The main shaft is splinedly connected to the cutting head, driving its rotation. The inner cylinder rotates independently of the main shaft but is connected to a fixed end. This design, with a fixed inner cylinder and a rotating outer cylinder, reduces the cumulative effect of bending moment and torque on the cantilever section's main shaft. A rear-mounted independent lubrication circuit ensures stable oil supply and personnel safety. This structure allows for clear division of labor among the various parts of the cutting device, resulting in a compact and rational structure that facilitates installation and maintenance. It also improves the overall operational stability and reliability of the cutting device, enabling it to better adapt to tunneling environments.
[0017] Preferably, the inner cylinder is equipped with independent first and second lubrication oil circuits to lubricate the first and second bearings respectively. This provides precise and sufficient lubrication for the two bearings, effectively reducing bearing wear, lowering the bearing temperature during operation, and extending the bearing service life. This ensures the long-term stable operation of the cutting device and improves the overall reliability and working efficiency of the equipment.
[0018] Preferably, the openings of the first and second lubrication oil passages are located on the side of the inner cylinder away from the cutting head, and each is equipped with a lubrication plug, making it convenient for operators to perform lubrication operations from a relatively safe and easy-to-operate position away from the cutting head; at the same time, the two lubrication oil passages are 180° apart along the circumference of the inner cylinder. This layout makes the lubrication operation more convenient and ensures that the lubricating oil is evenly distributed to the two bearings, further optimizing the lubrication effect.
[0019] Preferably, the cutting head includes a cutting head body, a tooth base, cutting teeth, and a protective sleeve, with the protective sleeve fitted onto the outer cylinder wall. The protective sleeve protects the internal components, such as the outer cylinder, preventing direct impact and wear from external materials during tunneling, extending the service life of the outer cylinder and related components, and also helping to maintain the overall stability of the cutting device.
[0020] Preferably, a spiral guide plate is provided on the outer wall of the protective cylinder. During the rotation of the cutting head, the spiral guide plate can guide the material to flow in a specific direction, realize the material conveying and guiding functions, help improve the material discharge efficiency in tunneling operations, reduce the impact of material accumulation on cutting operations, and improve overall work efficiency.
[0021] Preferably, a groove is formed in the body of the cutting head and a spring is set for axially limiting the main shaft. This can effectively prevent the main shaft from moving in the axial direction, ensure the stability of the spline connection between the main shaft and the cutting head, avoid problems such as loose connection and transmission failure caused by main shaft movement, and improve the accuracy and reliability of the cutting device transmission.
[0022] Preferably, O-rings are provided at both ends of the gap between the protective cylinder and the outer cylinder, and O-rings are also provided at the fitting point between the tail of the cutting head and the inner edge of the outer cylinder. These O-rings can play a good sealing role, preventing dust, moisture and other impurities from entering the cutting device during the tunneling process, protecting the internal bearings, main shaft and other key components from contamination and corrosion, extending the service life of the equipment and ensuring normal operation of the equipment.
[0023] Preferably, the tail end of the inner cylinder is axially connected to a reducer, and the reducer is splined to the main shaft. The reducer can reduce the speed and increase the torque of the power input from the main shaft, so that the cutting head can obtain a speed and torque more suitable for tunneling operations, meet the cutting force requirements under different geological conditions, and improve the adaptability and working efficiency of the cutting device.
[0024] Preferably, oil seals are provided on both sides of the first and second bearings along the axial direction of the outer cylinder, which can effectively prevent lubricating oil from leaking from both sides of the bearings, ensure that the bearings are always in a good lubricated state, and at the same time prevent external impurities from entering the bearings, reduce bearing wear, extend bearing service life, and improve the reliability and stability of the cutting device.
[0025] Preferably, the floating oil seal can achieve continuous sealing of the gap under vibration conditions. In particular, the tail end of the cantilever may accumulate sand and dust that have moved backward during tunneling. Using a floating oil seal helps to prevent external impurities from entering the gap between the inner and outer cylinders and even contaminating the first bearing. Attached Figure Description
[0026] The accompanying drawings described herein are for illustrative purposes only and do not limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a cross-sectional view of a cantilevered segmented tunneling machine cutting device in Embodiment 1; Figure 2 This is a diagram showing the connection keyway between the connecting keyway at the tail of the cutting head and the connecting key of the protective cylinder in Example 1.
[0027] The components are as follows: 1. Reducer; 2. Inner cylinder; 3. Bolt; 4. Main shaft; 5. First oil filler plug; 6. Floating oil seal; 7. First O-ring; 8. First bearing; 9. Second oil seal; 10. Protective cylinder; 11. Outer cylinder; 12. Spiral guide plate; 13. Third oil seal; 14. Second bearing; 15. Fourth oil seal; 16. Locking nut; 17. Locking washer; 18. Screw; 19. Gear seat; 20. Cutting tooth; 21. Cutting head body; 22. Spring; 23. Second O-ring; 24. Third O-ring; 25. Connecting keyway; 26. Connecting key; 27. Fourth O-ring; 28. Retaining ring; 29. Second oil filler plug. Detailed Implementation
[0028] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.
[0029] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0031] Example 1 like Figure 1 As shown, this embodiment provides a cantilever-supported segmented tunneling machine cutting device, which includes a main shaft 4 connected to the power input, a cantilever section, and a cutting head.
[0032] The cantilever section includes an inner cylinder 2 and an outer cylinder 11. The main shaft 4 is disposed inside the inner cylinder 2, and the inner cylinder 2 is disposed inside the outer cylinder 11. The inner cylinder 2 and the outer cylinder 11 are rotatably connected by a first bearing 8 and a second bearing 14 arranged in parallel. The two bearings are disposed at both ends of the gap between the inner cylinder 2 and the outer cylinder 11. The first bearing 8 is located near the rear end of the device and is clamped and limited by a shoulder on the outside of the inner cylinder 2 and a boss on the inside of the outer cylinder 11. The second bearing 14 is located near the front end of the device and is fixed on one side by a boss on the inner cylinder 2 and on the other side by a retaining ring 28 and two locking nuts 16 that clamp a locking washer 17. A second O-ring 23 is provided between the retaining ring 28 and the inner cylinder 2 to achieve a seal at the contact surface.
[0033] A first O-ring 7 and a floating oil seal 6 are installed on the rear side of the first bearing 8. The floating oil seal 6 can achieve continuous sealing of the gap under vibration conditions. In particular, sand and dust that have moved backward during tunneling may accumulate at the tail end of the cantilever section. The floating oil seal 6 helps prevent external impurities from entering the gap between the inner cylinder 2 and the outer cylinder 11, and even contaminating the first bearing 8. At the same time, the floating oil seal is located at the tail end of the cantilever section, away from the material accumulation area, thus extending its service life. A second oil seal 9 is installed on the front side of the first bearing 8 to ensure that the bearing lubricating oil remains inside the first bearing 8 and does not overflow from the other side.
[0034] The second bearing 14 is provided with a third oil seal 13 and a fourth oil seal 15 on its rear and front sides, respectively, to prevent lubricating oil from overflowing from the second bearing 14 from both sides and to avoid one-sided sealing.
[0035] The main shaft 4 is splinedly connected to the cutting head, which stably transmits the rotational speed of the main shaft 4 to the cutting head, thereby driving the cutting head to tunnel into the ore layer.
[0036] like Figure 1 As shown, the cutting head is connected to the outer cylinder 11 by screws 18, and the outer cylinder 11 rotates with the main shaft 4. This design, where the inner cylinder 2 is independent of the outer cylinder 11, helps the inner cylinder 2 maintain stable support for the cantilever section to share the stress caused by bending moment, avoids the superimposed bending and torsional stress encountered when a cantilever beam rotates, improves the shape design of the main shaft 4, and reduces the processing difficulty. The integrated design of the outer cylinder and the cutting head reduces the diameter of the cutting head and increases the cutting force.
[0037] The inner cylinder 2 is equipped with independent first and second lubrication oil circuits, which are used to lubricate the first bearing 8 and the second bearing 14, respectively. Separate oil supply to the two bearings ensures that their operating conditions and lubrication status do not affect each other, facilitating efficient lubrication, improving lubrication, and preventing insufficient oil supply from causing poor lubrication, temperature rise, and affecting the smooth and stable rotation between the inner cylinder 2 and the outer cylinder 11.
[0038] like Figure 1 As shown, the opening of the first lubricating oil passage is located on the side of the inner cylinder 2 away from the cutting head, i.e., the rear end of the device, and a first oil filling plug 5 is provided at the opening. The opening of the second lubricating oil passage is located on the side of the inner cylinder 2 away from the cutting head, i.e., the rear end of the device, and a second oil filling plug 29 is provided at the opening. The first lubricating oil passage and the second lubricating oil passage are 180° apart along the circumference of the inner cylinder 2. The first oil filling plug 5 and the second oil filling plug 29 are arranged at the rear end of the device to prevent accidental damage from the cutting teeth 20 during lubrication operation.
[0039] The cutting head includes a cutting head body 21, a toothed seat 19 on the cutting head body 21, cutting teeth 20 on the toothed seat 19, and a protective cylinder 10 connected to the tail of the cutting head body 21. Multiple screws 18 are evenly spaced circumferentially on the cutting head body 21 to fix the cutting head body 21 to the outer cylinder 11. The integrated design of the outer cylinder and the cutting head reduces the diameter of the cutting head and increases the cutting force. The front end of the cutting head body 21 is capsule-shaped, and the rear end is circumferentially fitted with teeth for axially embedding into the gap between the outer cylinder 11 and the inner cylinder 2 before the second bearing 14. The tail of the cutting head body 21 fits into the inner edge of the outer cylinder 11, and a third O-ring 24 is provided at the fitting point. Several toothed seats 19 are evenly arranged on the toothed seat 19, and each toothed seat 19 is fixedly or rotatably connected to a cutting tooth 20. The protective sleeve 10 is fitted onto the outer wall of the outer sleeve 11, and a fourth O-ring 27 is provided at both ends of the gap between the protective sleeve 10 and the outer sleeve 11. The above-mentioned O-rings mainly prevent external dust and moisture from entering the mating surfaces and causing corrosion, and ensure a good seal at the connection surface of moving and stationary parts, which can avoid seal wear failure and oil leakage damage.
[0040] like Figure 2 As shown, the connecting keyway 25 at the tail of the cutting head body 21 is connected to the connecting key 26 of the protective cylinder 10 to achieve an axial fixed connection. The curved connecting surface of the connecting key 26 not only helps with sealing but also enhances the stability of the transmission at high speeds on the radial outer side, overcoming the problem of the cutting head easily loosening during the cutting process. The traditional approach is to wrap the cutting head around the outside of the cantilever section with a certain rotational clearance, resulting in a larger cutting head diameter and a lower rock-breaking capacity under the same power output conditions.
[0041] A spiral guide plate 12 is installed on the outer wall of the protective cylinder 10. The spiral guide plate 12 can rotate with the protective cylinder 10 (as the cutting head rotates), thereby guiding the coal and rock material excavated during the tunneling process backward. This helps to improve the material discharge efficiency during tunneling operations, reduce the impact of material accumulation on the cutting operation, improve overall work efficiency, and leave space for the cutting teeth 20 to advance. It also reduces the wear and resistance of the cutting head. The length of the protective cylinder 10 can cover the cantilever section, overcoming the problem of limited material guiding space and congestion caused by a short cutting head, which increases the wear of the cutting head.
[0042] A groove is formed in the cutting head body 21, and a spring 22 is installed in the groove. The spring 22 is used to axially limit the main shaft 4 and dampen vibration, prevent the main shaft 4 from moving in the axial direction, ensure the stability of the spline connection between the main shaft 4 and the cutting head, avoid problems such as loose connection and transmission failure caused by the movement of the main shaft 4, and improve the accuracy and reliability of the cutting device transmission.
[0043] The tail end of the inner cylinder 2 is axially connected to the output end of the reducer 1 via bolts 3, and the input end of the reducer 1 is splinedly connected to the main shaft 4. The movement of the inner cylinder 2 is independent of the rotation of the main shaft 4.
[0044] A method for using a cutting device for a cantilevered segmented tunneling machine includes the following steps: The cutting device is fixedly installed on the head of the tunneling machine through the inner cylinder 2; Lubricating oil is added to the first bearing 8 and the second bearing 14 through the first lubrication oil passage and the second lubrication oil passage, respectively. Start the power source so that power is input through the main shaft 4, and the main shaft 4 drives the cutting head to rotate through a spline connection; The outer cylinder 11 rotates with the cutting head under the support of the bearing, and realizes the conveying and guiding of materials through the cooperation between its outer wall and the protective cylinder 10 and the function of the spiral guide plate 12.
[0045] Example 2 The difference between this embodiment and Embodiment 1 is that: 1) The inner cylinder 2 is connected to the fixed end of the tunneling machine, and the stationary state of the inner cylinder 2 is independent of the rotation of the main shaft 4.
[0046] When the inner cylinder 2 is connected to the fixed end of the tunneling machine, the inner cylinder 2 is completely stationary, which can provide static support for the cantilever section and the cutting head. It is suitable for tunneling machines when the speed of power transmission to the main shaft 4 is low, without speed reduction and torque increase.
[0047] The above embodiments are merely one of the implementation methods to achieve the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model.
Claims
1. A cutting device for a cantilevered segmented tunneling machine, characterized in that, The machine comprises a main shaft (4) for power input, a cantilever section, and a cutting head. The cantilever section includes an inner cylinder (2) and an outer cylinder (11). The main shaft (4) is located inside the inner cylinder (2), and the inner cylinder (2) is located inside the outer cylinder (11). The inner cylinder (2) and the outer cylinder (11) are rotatably connected by bearings. The main shaft (4) is spline-connected to the cutting head, and the rotation of the main shaft (4) drives the cutting head. The inner cylinder (2) is connected to the fixed end of the tunneling machine, and the movement or stillness of the inner cylinder (2) is independent of the rotation of the main shaft (4). The cutting head is connected to the outer cylinder (11) by screws (18), and the outer cylinder (11) rotates with the rotation of the main shaft (4). The inner cylinder (2) is provided with independent first and second lubrication oil circuits, which are used to lubricate the first bearing (8) and the second bearing (14), respectively.
2. The cantilever-supported segmented tunneling machine cutting device according to claim 1, characterized in that, The opening of the first lubricating oil passage is located on the side of the inner cylinder (2) away from the cutting head, and a first oil filling plug (5) is provided at the opening. The opening of the second lubricating oil passage is located on the side of the inner cylinder (2) away from the cutting head, and a second oil filling plug (29) is provided at the opening. The first lubricating oil passage and the second lubricating oil passage are 180° apart along the circumference of the inner cylinder (2).
3. The cantilever-supported segmented tunneling machine cutting device according to claim 1, characterized in that, The cutting head includes a cutting head body (21), a tooth seat (19) provided on the cutting head body (21), cutting teeth (20) provided on the tooth seat (19), and a protective cylinder (10) connected to the tail of the cutting head body (21); the protective cylinder (10) is sleeved on the outer wall of the outer cylinder (11).
4. The cantilever-supported segmented tunneling machine cutting device according to claim 3, characterized in that, A spiral guide plate (12) is provided on the outer wall of the protective cylinder (10).
5. A cantilever-supported segmented tunneling machine cutting device according to claim 3, characterized in that, A groove is provided in the cutting head body (21), and a spring (22) is provided in the groove. The spring (22) is used to axially limit the spindle (4).
6. The cantilever-supported segmented tunneling machine cutting device according to claim 3, characterized in that, O-rings are provided at both ends of the gap between the protective cylinder (10) and the outer cylinder (11); the tail of the cutting head (21) is fitted with the inner edge of the outer cylinder (11), and an O-ring is provided at the fitting point.
7. A cantilever-supported segmented tunneling machine cutting device according to claim 1, characterized in that, The tail end of the inner cylinder (2) is axially connected to a reducer (1), and the reducer (1) is splinedly connected to the main shaft (4).
8. The cantilever-supported segmented tunneling machine cutting device according to claim 1, characterized in that, Oil seals are provided on both sides of the first bearing (8) and the second bearing (14) along the axial direction of the outer cylinder (11).
9. A cantilever-supported segmented tunneling machine cutting device according to claim 8, characterized in that, The oil seal on the side of the inner cylinder (2) of the first bearing (8) is a floating oil seal.