Mine equipment cutting device

Abstract

The present application relates to the technical field of mine exploitation machinery, in particular to a mine equipment cutting device, comprising a cutter head, a roller, a cutter head shaft, an eccentric mass and a driving member; the eccentric mass is rotatably installed inside the cutter head shaft, the driving member is installed inside the cutter head shaft and is drivingly connected to the eccentric mass, and a hollow cavity is arranged inside the eccentric mass; the roller is connected to the outer periphery of the cutter head shaft, and the cutter head is fixed to the front end of the cutter head shaft; the cutter head shaft and the roller are provided with a centralized lubrication structure. The eccentric mass with the hollow cavity can effectively reduce the volume of the oil stirring area, reduce the power loss caused by oil resistance, and improve the energy utilization efficiency of the equipment; the centralized lubrication structure improves the lubrication reliability, and solves the technical problems that the excitation force of the structure of the cutting assembly of the existing hard rock mine equipment is transmitted to the cutter head, which causes great damage, and the split lubrication structure causes insufficient oil film thickness.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine exploitation machinery, in particular to a mine equipment cutting device. BACKGROUND

[0002] As the core functional component of hard rock breaking operation, the eccentric mass block carried inside the hard rock mine equipment cutting assembly rotates at high speed under the drive of the hydraulic motor, and the excitation force is transmitted to the drill bit through the bearing; at the same time, the cutting assembly is pushed by the thrust of the push cylinder, so that the drill bit applies dynamic and static coupling load to the rock, thereby breaking through the tensile strength limit of the rock and realizing efficient rock breaking operation.

[0003] The current market mainstream hard rock mine equipment cutting assembly generally adopts "eccentric mass block rear layout", that is, the eccentric mass block is arranged behind the cutter head shaft, and two independent bearings are used to support the eccentric mass block and the cutter head shaft. Due to the short distance from the excitation force acting point to the center of the large arm rotation, according to the torque balance principle, the excitation force transmitted to the cutter head will be greatly reduced. Secondly, due to the spatial arrangement of the eccentric mass block, the two bearings can only adopt a split lubrication scheme: the bearing supporting the high-speed rotation of the eccentric mass block is configured with a circulating oil lubrication system, while the bearing supporting the cutter head shaft can only adopt a grease lubrication method due to the installation space limitation. However, the working condition of the cutter head shaft supporting bearing is extremely poor. In high temperature environment, the lubricating grease is difficult to quickly penetrate into the contact interface of the bearing rolling body and the raceway, which easily causes insufficient oil film thickness and significantly increases the risk of direct friction between metals. In addition, the lubricating grease itself has low thermal conductivity and poor flowability, and cannot timely conduct the heat generated during bearing operation. Under high load working condition, the continuous accumulation of heat will cause the lubricating grease to oxidize and deteriorate, and even cause bearing ablation failure in severe cases. SUMMARY

[0004] The main purpose of the present application is to provide a mine equipment cutting device, which aims to solve the technical problems of the existing hard rock mine equipment cutting assembly structure that the excitation force transmitted to the cutter head will be greatly reduced and the split lubrication structure will cause insufficient oil film thickness.

[0005] To achieve the above purpose, the present application provides a mine equipment cutting device, which comprises a cutter head, a roller, a cutter head shaft, an eccentric mass block and a driving member. The eccentric mass block is rotatably installed inside the cutter head shaft, the driving member is installed inside the cutter head shaft and is drivingly connected to the eccentric mass block, and the eccentric mass block is internally provided with a hollow cavity. The roller is connected to the outer periphery of the cutter head shaft, and the cutter head is fixed to the front end of the cutter head shaft. The cutter head shaft and the roller are internally provided with a centralized lubrication structure.

[0006] The mine equipment cutting device of the present application is further improved in that a first supporting bearing is connected between the cutter head shaft and the roller.

[0007] The mining equipment cutting device further improves that a stepped washer for adjusting the axial clearance range of the first support bearing is sleeved on the cutter shaft.

[0008] The mining equipment cutting device further improves that the first support bearing is a tapered roller bearing.

[0009] The mining equipment cutting device further improves that the second support bearing is installed between the two ends of the eccentric mass and the cutter shaft.

[0010] The mining equipment cutting device further improves that the second support bearing is a spherical roller bearing.

[0011] The mining equipment cutting device further improves that the centralized lubrication structure comprises a first oil inlet flow channel, a first oil return flow channel, a second oil inlet flow channel and a second oil return flow channel, the first oil inlet flow channel is arranged at the lower part of the cutter shaft, the first oil return flow channel is arranged at the upper part of the cutter shaft, and the first oil inlet flow channel is provided with an outlet opposite to the first support bearing; the second oil inlet flow channel is arranged at the lower part of the drum, and the second oil return flow channel is arranged at the upper part of the drum.

[0012] The mining equipment cutting device further improves that the front end of the cutter shaft is fixed with a sealing plate, a first sealing assembly is arranged between the sealing plate and the cutter shaft, and a second sealing assembly is arranged between the sealing plate and the drum.

[0013] The mining equipment cutting device further improves that a bushing is installed between the rear part of the drum and the cutter shaft, a third sealing assembly is installed between the bushing and the drum, and a fourth sealing assembly is installed between the bushing and the cutter shaft.

[0014] The mining equipment cutting device further improves that a dustproof ring is installed between the rear part of the drum and the cutter shaft and outside the bushing.

[0015] The technical scheme of the present application has the following beneficial effects:

[0016] The mine equipment cutting device provided by the application can effectively reduce the volume of the oil stirring area, reduce the power loss caused by oil resistance, and improve the energy utilization efficiency of the device; the centralized lubrication structure integrated in the drum and the cutter head shaft reduces the complexity of pipeline arrangement, reduces the risk of pipeline leakage, enhances the bearing heat dissipation effect, ensures that the lubricating oil fully fills the bearing gap, realizes full-contact lubrication between the bearing rolling body and the raceway, effectively improves the lubrication reliability, solves the technical problems that the excitation force of the structure of the cutting assembly of the existing hard rock mine equipment is transmitted to the cutter head and the oil film thickness is insufficient due to the split lubrication structure, improves the reliability and safety of the cutting assembly, and prolongs the fault-free operation time of the device. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings shown.

[0018] Figure 1 FIG. 1 is a longitudinal sectional view of the mine equipment cutting device of the present application;

[0019] Figure 2 FIG. 6 is a schematic view of the internal structure of the eccentric mass block of the mine equipment cutting device of the present application.

[0020] Explanation of reference numerals:

[0021] 1-cutter head; 2-seal plate; 21-first sealing assembly; 3-rolling drum; 31-second sealing assembly; 32-second oil inlet flow channel; 33-second oil return flow channel; 4-gasket; 5-cutter head shaft; 51-first oil inlet flow channel; 52-first oil return flow channel; 6- eccentric mass block; 61-fan-shaped solid area; 62-fan-shaped hollow area; 63-key shaft; 7-bushing; 71-third sealing assembly; 72-fourth sealing assembly; 8-dustproof ring; 9-first support bearing; 10-second support bearing; 11-motor mounting flange; 12-hydraulic motor. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0023] It should be noted that all the direction indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the direction indications will also change accordingly.

[0024] In addition, the descriptions such as "first", "second" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0025] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. 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.

[0026] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

[0027] As shown in Figure 1 and Figure 2 The present application proposes a mine equipment cutting device, which comprises a cutter head 1, a roller 3, a cutter head shaft 5, an eccentric mass 6 and a driving member. The eccentric mass 6 is rotatably installed inside the cutter head shaft 5, the driving member is installed inside the cutter head shaft 5 and is drivingly connected to the eccentric mass 6, and the eccentric mass 6 is internally provided with a hollow cavity. The roller 3 is connected to the outer periphery of the cutter head shaft 5, and the cutter head 1 is fixed to the front end of the cutter head shaft 5. The cutter head shaft 5 and the roller 3 are internally provided with a centralized lubrication structure.

[0028] Specifically, the cutter head 1 and the roller 3 are fixedly connected through a plurality of groups of high-strength bolts uniformly distributed in the circumferential direction. Bolts with sufficient strength grade are selected to ensure the stability and reliability of the cutting torque in the transmission process and avoid operation failure caused by loose connection. The eccentric mass block 6 is arranged in the hollow cavity of the cutter shaft 5, and the eccentricity thereof is adaptively designed according to the excitation force demand to generate sufficient excitation force to break the rock mass. By reasonably designing the eccentricity, the overall vibration of the equipment caused by excessive excitation force can be avoided while the breaking effect is ensured. In order to avoid power loss caused by oil stirring of the eccentric mass block 6 during rotation, as shown in Figure 2 the eccentric mass block 6 preferably adopts a hollow fan-shaped structure, and the eccentric mass block 6 comprises a fan-shaped solid area 61, a fan-shaped hollow area 62 and a spline shaft 63. The hollow fan-shaped structure can effectively reduce the volume of the oil stirring area, reduce the power loss caused by oil resistance and improve the energy utilization efficiency of the equipment. On the other hand, the problem of increasing the complexity of arrangement caused by the increase in the number of pipelines in the split lubrication scheme is avoided, and the risk of pipeline failure is reduced.

[0029] The present application optimizes the structure design and lubrication path planning to realize synchronous and efficient lubrication of the two groups of bearings, significantly reduces the machining cost and pipeline complexity, effectively improves the operation reliability and operation safety of the cutting device, prolongs the fault-free operation time of the equipment, and adapts to the harsh working condition demand in the hard rock tunneling process.

[0030] Preferably, as shown in Figure 1 the first support bearing 9 is connected between the cutter shaft 5 and the roller 3. The first support bearing 9 is arranged in the axial direction of the cutter shaft 5 to provide reliable radial positioning and stable axial support for the cutter shaft 5, thereby ensuring the structural stability of the cutter head 1 during rotation and cutting. The cutter shaft 5 is sleeved on the inner ring of the first support bearing 9. This cooperation not only facilitates assembly, but also leaves reasonable space for the normal operation of the bearing to avoid excessive operating resistance caused by interference fit.

[0031] Preferably, the cutter shaft 5 is sleeved with a stepped washer 4 for adjusting the axial play range of the first support bearing 9. The washer 4 is made of a material with good rigidity (the material can be selected from 65Mn and a material with a hardness of HRC 35-45), the thickness tolerance of the washer 4 is controlled within a precise range (the thickness tolerance is less than 3 microns), and the surface flatness meets the high-precision requirement. Through precise size control, the axial play of the bearing is adjusted to an adaptive range to ensure that the bearing is in the best working state and reduce vibration and noise during operation.

[0032] Since the first support bearing 9 needs to bear the radial cutting force, axial thrust and overturning moment transmitted by the cutter head 1 during operation, the stress state is complex and the working condition is harsh, preferably, the first support bearing 9 adopts a tapered roller bearing, which is arranged in a back-to-back structure. This type of bearing can effectively bear radial force and axial force at the same time through special roller way angle design. The contact angle is adapted according to actual bearing requirements, which can maintain good working stability and excellent bearing capacity under complex and variable working conditions, prolonging the service life of the bearing.

[0033] Preferably, the second support bearing 10 is installed between the two ends of the eccentric mass 6 and the cutter shaft 5 to form a stable rotating structure.

[0034] Since the second support bearing 10 needs to bear the huge centrifugal force (which can reach several times the weight of the cutting device) generated by the high-speed rotation of the eccentric mass 6, and the working speed of the eccentric mass 6 is in the adaptive high-speed range, preferably, the second support bearing 10 adopts a spherical roller bearing, which has a centering function, and the radial clearance grade is selected from the adaptive model, which can effectively compensate for the influence of installation errors and shaft deformation. The outer ring of the spherical roller bearing near the cutter head 1 side and the outer wall of the cutter shaft 5 inner cavity adopt interference fit to ensure that the outer ring does not rotate during operation; the inner ring of the spherical roller bearing and the front end shaft of the eccentric mass 6 adopt clearance fit, which is convenient for assembly and lubricating medium circulation; the outer ring of the spherical roller bearing far away from the cutter head 1 side and the inner wall of the motor mounting flange 11 adopt interference fit, and the inner ring of the bearing and the rear shaft of the eccentric mass 6 adopt clearance fit, which ensures the stable operation of the bearing through reasonable matching.

[0035] Preferably, the centralized lubrication structure comprises a first oil inlet flow channel 51, a first oil return flow channel 52, a second oil inlet flow channel 32 and a second oil return flow channel 33, the first oil inlet flow channel 51 is arranged at the lower part of the cutter shaft 5, the first oil return flow channel 52 is arranged at the upper part of the cutter shaft 5, and the first oil inlet flow channel 51 is provided with an outlet opposite to the first support bearing 9; the second oil inlet flow channel 32 is arranged at the lower part of the drum 3, and the second oil return flow channel 33 is arranged at the upper part of the drum 3. Specifically, the second oil inlet flow channel 32 and the second oil return flow channel 33 are both radially arranged, and the diameters of the flow channels on the drum 3 and the flow channels on the cutter shaft 5 are the same (8mm-12mm). The integrated design of the flow channels and the structure reduces the use of external pipelines, reduces the complexity of pipeline arrangement, and also reduces the leakage points. During the flow of the lubricating oil, a first lubricating cavity is formed in the front part of the cutter shaft 5, and a second lubricating cavity is formed between the drum 3 and the cutter shaft 5. The outlet of the first oil inlet flow channel 51 on the cutter shaft 5 is communicated with the bearing seat oil injection port of the first support bearing 9 through a radial branch flow channel and a rotary joint, and the inlet is communicated with the second lubricating cavity; the inlet of the first oil return flow channel 52 is communicated with the first lubricating cavity, and the outlet is communicated with the second lubricating cavity, forming a series lubrication circuit, which greatly reduces the number of external pipelines. The series circuit design can realize the sequential lubrication of multiple lubrication points, ensure that each lubrication part can obtain sufficient lubricating medium, and also reduce the complexity of pipeline arrangement and the risk of pipeline leakage from the root; at the same time, the machining process flow is simplified, and the machining cost is significantly reduced.

[0036] The oil injection mode of the application strictly adopts the gravity circulation principle of "low-position oil inlet and high-position oil return", the oil inlet position is lower than the center of the bearing rolling body by a proper distance, and the oil return position is higher than the center of the bearing rolling body by a proper distance. Through this position design, it is ensured that the lubricating oil can fully fill the bearing gap under the joint action of gravity and pressure difference, realize full-contact lubrication between the bearing rolling body and the raceway, and guarantee the lubrication effect. The lubricating oil flow is controlled within the range meeting the lubrication demand, which not only ensures sufficient lubricating medium supply, but also avoids energy loss and medium waste caused by excessive flow.

[0037] Preferably, the front end of the cutter head shaft 5 is fixed with a sealing plate 2, the sealing plate 2 is provided with a first sealing assembly 21 between the sealing plate 2 and the cutter head shaft 5, and the sealing plate 2 is provided with a second sealing assembly 31 between the sealing plate 2 and the roller 3. Specifically, the sealing plate 2 and the cutter head shaft 5 are fixedly connected through a flange surface bolt, the bolt is distributed at a reasonable proportion of the diameter of the cutter head shaft 5 to ensure the uniform distribution of the connection strength. And the axis of the sealing plate 2, the axis of the cutter head shaft 5 and the axis of the cutter head 1 are strictly collinear, and the coaxiality error is controlled within the allowable range, thereby reducing the additional load generated by eccentric operation and reducing the wear rate of the parts. The first sealing assembly 21 and the second sealing assembly 31 adopt a combined structure of double-lip skeleton oil seal and O-ring, the double-lip skeleton oil seal can effectively realize axial sealing, and the O-ring is responsible for radial sealing, through the double sealing design, the sealing performance is significantly improved, and the leakage of lubricating medium and the invasion of external impurities into the lubricating cavity are prevented.

[0038] Preferably, a bushing 7 is installed between the rear part of the roller 3 and the cutter head shaft 5, a third sealing assembly 71 is installed between the bushing 7 and the roller 3, and a fourth sealing assembly 72 is installed between the bushing 7 and the cutter head shaft 5. In the embodiment, the bushing 7 is made of tin bronze which has good friction reduction and wear resistance. This material not only reduces the friction coefficient between the cooperating parts and reduces energy loss, but also maintains good wear resistance during long-term use, prolonging the replacement cycle of the bushing 7. The third sealing assembly 71 and the fourth sealing assembly 72 both adopt a U-shaped sealing ring made of polyurethane material. This material has excellent elasticity and oil resistance, and through a reasonable pre-compression amount, the stability of the sealing performance is ensured, the sealing effect inside the lubricating cavity is ensured, and the leakage of lubricating medium is avoided. The sealing assembly of the present application is different from the structure of the split type lubrication which needs to set a rotary seal on the rotor shaft. All the seals are arranged in the stator or the rotor part with very low linear velocity. This design avoids the leakage risk caused by rotary seal from the root, thereby further reducing the maintenance cost and failure rate during equipment operation.

[0039] Preferably, a dustproof ring 8 is installed between the rear part of the roller 3 and the cutter head shaft 5 and outside the bushing 7. In the embodiment, the dustproof ring 8 is made of nitrile rubber and has a J-shaped structure. The dustproof ring 8 is sleeved on the second stepped surface of the cutter head shaft 5 and tightly abuts against the bushing 7. The nitrile rubber has good oil resistance and wear resistance, and the J-shaped structure design can effectively block the invasion of external dust, rock debris and other impurities into the bearing cavity, providing a good working environment for the bearing and reducing wear and failure caused by impurities.

[0040] Preferably, the driving member is a hydraulic motor 12, a motor mounting flange 11 for mounting the hydraulic motor 12 is sleeved on the inside of the cutter head shaft 5, and the output shaft of the hydraulic motor 12 is connected to the eccentric mass 6. The motor mounting flange 11 is positioned and tightly attached to the stepped surface on the inside of the cutter head shaft 5 through an end face, and the axial position of the motor mounting flange 11 is fixed through this positioning mode, thereby providing a stable reference for the installation of the hydraulic motor 12.

[0041] The output shaft of the hydraulic motor 12 is connected to the rear end shaft of the eccentric mass 6 through an involute spline, and the spline is of a high-precision grade to ensure the stability and reliability of power transmission and to transmit the torque meeting the operation requirements. The hydraulic motor 12 is fixed on the motor mounting flange 11 through flange bolts, the pre-tightening force of the bolts meets the requirements of relevant standards, and the hydraulic motor 12 will not be loosened during high-speed operation.

[0042] To prevent the high-frequency vibration of the eccentric mass 6 from being transmitted to the hydraulic motor 12 and causing fatigue damage of internal parts of the motor due to long-term vibration, further, the output shaft of the hydraulic motor 12 and the rear end shaft of the eccentric mass 6 can be connected through an elastic coupling instead of the spline connection structure. The elastic coupling has a certain elastic deformation capacity, can effectively reduce the vibration transmission rate, protects the hydraulic motor 12 from vibration damage, and prolongs the service life thereof.

[0043] The mine equipment cutting device of the present application can effectively reduce the volume of the oil stirring area, reduce the power loss caused by oil resistance, and improve the energy utilization efficiency of the equipment through the hollow cavity of the eccentric mass 6. The centralized lubrication structure integrated in the roller 3 and the cutter head shaft 5 reduces the complexity of pipeline arrangement, reduces the risk of pipeline leakage, enhances the bearing heat dissipation effect, ensures that the lubricating oil fully fills the bearing gap, realizes full-contact lubrication between the bearing rolling body and the raceway, effectively improves the lubrication reliability, solves the technical problems that the excitation force of the structure of the cutting assembly of the existing hard rock mine equipment is transmitted to the cutter head 1 and has a large loss, and the split type lubrication structure causes insufficient oil film thickness, improves the reliability and safety of the cutting assembly, and prolongs the fault-free operation time of the equipment.

[0044] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made under the inventive concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A cutting device for mining equipment, characterized in that, The device includes a cutter head (1), a roller (3), a cutter head shaft (5), an eccentric mass block (6), and a driving component. The eccentric mass block (6) is rotatably mounted inside the cutter head shaft (5), and the driving component is mounted inside the cutter head shaft (5) and driven by the eccentric mass block (6). The eccentric mass block (6) has a hollow cavity inside. The roller (3) is connected to the outer periphery of the cutter head shaft (5), and the cutter head (1) is fixed to the front end of the cutter head shaft (5). The cutter head shaft (5) and the roller (3) are provided with a centralized lubrication structure. A first support bearing (9) is connected between the cutter head shaft (5) and the roller (3). The centralized lubrication structure includes a first oil inlet channel (51), a first oil return channel (52), a second oil inlet channel (32), and a second oil return channel (33). The first oil inlet channel (51) is located at the lower part of the cutter head shaft (5), and the first oil return channel (52) is located at the upper part of the cutter head shaft (5). The first oil inlet channel (51) has an outlet directly opposite the first support bearing (9). The second oil inlet channel (32) is located at the lower part of the drum (3), and the second oil return channel (33) is located at the upper part of the drum (3).

2. The mining equipment cutting device as described in claim 1, characterized in that, The cutter head shaft (5) is fitted with a stepped washer (4) for adjusting the axial clearance range of the first support bearing (9).

3. The mining equipment cutting device as described in claim 1, characterized in that, The first support bearing (9) is a tapered roller bearing.

4. The mining equipment cutting device as described in claim 1, characterized in that, Second support bearings (10) are installed at both ends of the eccentric mass block (6) and the cutter head shaft (5).

5. The mining equipment cutting device as described in claim 4, characterized in that, The second support bearing (10) is a spherical roller bearing.

6. The mining equipment cutting device as described in claim 1, characterized in that, A sealing plate (2) is fixed at the front end of the cutter head shaft (5). A first sealing component (21) is provided between the sealing plate (2) and the cutter head shaft (5), and a second sealing component (31) is provided between the sealing plate (2) and the roller (3).

7. The mining equipment cutting device as described in claim 1, characterized in that, A bushing (7) is installed between the rear of the roller (3) and the cutter head shaft (5), a third sealing assembly (71) is installed between the bushing (7) and the roller (3), and a fourth sealing assembly (72) is installed between the bushing (7) and the cutter head shaft (5).

8. The mining equipment cutting device as described in claim 7, characterized in that, A dustproof ring (8) is installed between the rear of the roller (3) and the cutter head shaft (5) and outside the bushing (7).

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