Assembly structure for preventing eccentric wear of cutting pick

Abstract

The utility model discloses an assembly structure for preventing eccentric wear of a cutting pick, which comprises a pick holder, the cutting pick and a double-row tapered roller bearing, and the bottom of the pick holder is provided with a counter bore; the double-row tapered roller bearing is embedded in the counter bore; the handle part of the cutting tooth is arranged on the inner ring of the double-row tapered roller bearing, and the end part of the cutting tooth upwards extends out of the tooth holder and is limited by a clamping ring. According to the utility model, the double-row tapered roller bearing is arranged in the counter bore of the tooth holder, and the cutting teeth are arranged in the double-row tapered roller bearing, so that the cutting system can bear larger radial and axial loads, and the cutting teeth can keep higher precision and rigidity in the rotating process; the probability that the cutting teeth are broken off due to uneven stress and the end face of the tooth holder is axially pressed to be insufficient is reduced, the stability and reliability of a cutting system are improved, and the complex stress requirement in coal mining operation is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal mining technical field especially relates to a kind of assembly structure of preventing pick eccentric wear. BACKGROUND

[0002] Cutting system plays a key role in coal mining operation, and is the direct cutting structure of spiral drum of coal winning machine to strip coal wall. Among them, pick is the core cutter to cut coal wall, tooth sleeve plays the role of auxiliary installation pick and protection tooth seat, and tooth seat is the installation carrier of entire cutting system.

[0003] Pick is a consumable product, which will gradually fail and need to be replaced during use. At present, the commonly used cutting system has various configurations, which can select the combination of pick, tooth sleeve and tooth seat, or the system composed of pick and tooth seat (without tooth sleeve), and in the cutting system with tooth sleeve, tooth sleeve with different inner hole sizes can be selected to assemble different types of picks on the same tooth seat.

[0004] However, regardless of the above configuration, pick is usually designed to be able to rotate freely, which aims to evenly distribute the wear of pick when cutting materials, and at the same time, offset part of the cutting resistance, thereby prolonging the service life of pick. However, in actual operation, the free rotation of pick faces many problems. During rotation, the handle part and shoulder end face of pick will generate large friction force with the inner hole side wall and inner hole end face of tooth sleeve or with the inner hole side wall and inner hole end face of tooth seat. This friction force not only hinders the free rotation of pick, but also aggravates the wear and failure of tooth sleeve or tooth seat.

[0005] In order to further improve the self-rotation ability of pick, part of the cutting system with tooth sleeve is designed to be able to rotate freely in the inner hole of tooth seat. Although this design reduces the situation that the powder of cutting materials enters the gap between pick, tooth sleeve and tooth seat and hinders the rotation of pick, due to the large friction resistance, the effect of free rotation of pick still does not reach the ideal state, which easily leads to pick eccentric wear and premature failure. SUMMARY

[0006] The utility model aims at at least one of the above technical problems in the technical field.

[0007] To achieve the above purpose, the utility model discloses a kind of assembly structure of preventing pick eccentric wear, including: tooth seat, pick and double-row tapered roller bearing, wherein the bottom of the tooth seat is provided with counterbore;Double-row tapered roller bearing is embedded in the counterbore;The handle part of the pick is arranged in the inner ring of the double-row tapered roller bearing, and the end part of the pick extends to the outside of the tooth seat upward, and is limited by snap ring.

[0008] In addition, the assembly structure for preventing the cutting tooth from eccentric wear can have the following additional technical features.

[0009] As a further description of the above technical solution: the double-row tapered roller bearing comprises an inner ring, an outer ring, double-row tapered rollers and a retainer, wherein the double-row tapered rollers are arranged between the inner ring and the outer ring through the retainer; the inner ring is matched with the handle portion of the cutting tooth; and the outer ring is matched with the counterbore of the tooth seat.

[0010] As a further description of the above technical solution: a reserved groove is arranged at the counterbore of the tooth seat, and the reserved groove is used to realize mechanical disassembly of the double-row tapered roller bearing.

[0011] As a further description of the above technical solution: a first sealing gasket is arranged between the shoulder end face of the cutting tooth and the end face of the double-row tapered roller bearing, and the thickness of the first sealing gasket is 0.5mm-1.5mm, so as to block dust and impurities.

[0012] As a further description of the above technical solution: a second sealing gasket is arranged between the other end face of the double-row tapered roller bearing and the counterbore of the tooth seat, and the thickness of the second sealing gasket is 0.8mm-2mm.

[0013] As a further description of the above technical solution: the double-row tapered roller bearing is filled with lubricating grease.

[0014] As a further description of the above technical solution: the cutting tooth and the double-row tapered roller bearing are in interference fit, so as to prevent the cutting tooth from loosening or displacement in the double-row tapered roller bearing.

[0015] According to the assembly structure for preventing the cutting tooth from eccentric wear, the double-row tapered roller bearing is arranged in the counterbore of the tooth seat, and the cutting tooth is installed in the double-row tapered roller bearing, so that the cutting system can effectively bear larger radial and axial loads, the cutting tooth can maintain higher precision and rigidity during rotation, the probability of breaking the cutting tooth and the axial compression of the tooth seat end face due to uneven stress is reduced, the stability and reliability of the cutting system are improved, and the complex stress requirement in the coal mining operation is met.

[0016] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0018] Fig. 1 is a structural schematic diagram of the assembly structure for preventing wear of a cutting tooth according to one embodiment of the present application;

[0019] Fig. 2 is a structural schematic diagram of the assembly structure for preventing wear of a cutting tooth according to another embodiment of the present application;

[0020] Fig. 3 is an internal schematic diagram of the assembly structure for preventing wear of a cutting tooth according to one embodiment of the present application;

[0021] As shown in the figure:

[0022] 100, tooth seat; 101, counterbore; 102, reserved groove; 200, cutting tooth; 201, shank; 202, shoulder; 300, double-row tapered roller bearing; 400, snap ring. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0024] The assembly structure for preventing wear of a cutting tooth according to the embodiments of the present application is described below in conjunction with the drawings.

[0025] As shown in the figure: Figs. 1 to 3 The assembly structure for preventing wear of a cutting tooth according to the embodiments of the present application can include a tooth seat 100, a cutting tooth 200, and a double-row tapered roller bearing 300, wherein the tooth seat 100 has a counterbore 101 formed at the bottom, the double-row tapered roller bearing 300 is embedded in the counterbore 101, the shank 201 of the cutting tooth 200 is arranged in the inner ring of the double-row tapered roller bearing 300, and the end of the cutting tooth 200 extends upward to the outside of the tooth seat 100 and is limited by a snap ring 400.

[0026] The cutting tooth 200 and the double-row tapered roller bearing 300 are in interference fit to prevent the cutting tooth 200 from loosening or displacing in the double-row tapered roller bearing 300.

[0027] It should be noted that the coal mining environment is harsh, and the cutting tooth 200 needs to bear a huge radial and axial load when cutting the coal wall, and the double-row tapered roller bearing 300 has a large radial and axial load capacity, which can better adapt to this high-strength stress environment.

[0028] For example, when the cutting tooth 200 penetrates into the coal seam for cutting, it will be subjected to strong radial resistance from the coal wall and axial force due to the change of the cutting angle, and the ordinary bearing can be deformed and damaged under such heavy load, resulting in that the cutting tooth 200 cannot work normally, while the double-row tapered roller bearing 300 can stably bear the load, ensuring the normal operation of the cutting system.

[0029] To clearly illustrate the above embodiment, in an embodiment of the present application, the double-row tapered roller bearing 300 comprises an inner ring, an outer ring, double-row tapered rollers and a retainer.

[0030] The double-row tapered rollers are arranged between the inner ring and the outer ring through the retainer, the inner ring is matched with the shank portion 201 of the cutting tooth 200, and the outer ring is matched with the counterbore 101 of the tooth seat 100.

[0031] It should be noted that the cutting tooth 200 needs to maintain high rotation accuracy and rigidity during the working process to ensure the cutting quality and efficiency, the double-row tapered roller bearing 300 can provide higher accuracy when rotating, and the contact mode between the double-row tapered rollers and the raceways of the inner and outer rings is beneficial to maintaining the concentricity and perpendicularity of the shaft.

[0032] During the high-speed rotating cutting process of the coal mining machine, the ordinary bearing can cause the cutting tooth 200 to jump and swing due to insufficient accuracy, affecting the cutting effect, while the double-row tapered roller bearing 300 can make the cutting tooth 200 rotate more stably, improve the cutting accuracy, and at the same time, the high rigidity can reduce the deformation when subjected to force, ensuring the position accuracy of the cutting tooth 200 under various complex working conditions.

[0033] In addition, the friction coefficient of the double-row tapered roller bearing 300 is relatively small, and the smaller frictional resistance makes the cutting tooth 200 more easily self-rotate during the cutting process, thereby better uniform wear and prevent the occurrence of eccentric wear. In the dust environment of the coal mine, the ordinary bearing is more prone to wear due to the large friction caused by the dust entering, resulting in poor rotation, while the double-row tapered roller bearing 300 can reduce such influence to a certain extent and maintain good working performance.

[0034] In an embodiment of the present application, the counterbore 101 of the tooth seat 100 is provided with a reserved groove 102, and the reserved groove 102 is used to realize the mechanical disassembly of the double-row tapered roller bearing 300.

[0035] It should be noted that when the double-row tapered roller bearing 300 structure needs to be disassembled for maintenance or replacement, the relevant staff can use a special tool to insert the reserved slot 102 in the inner hole of the tooth holder 100, and by applying appropriate force, the tool contacts the bearing outer ring and is lifted out of the counterbore 101 of the tooth holder 100. After the bearing is removed, the cutting tooth 200, the tooth sleeve, and the tooth holder 100 can be inspected, repaired, or replaced, and then reassembled according to the installation process to restore the cutting system to normal working condition.

[0036] In an embodiment of the present application, a first sealing gasket is provided between the end face of the shoulder 202 of the cutting tooth 200 and the end face of the double-row tapered roller bearing 300, and the thickness of the first sealing gasket is 0.5mm-1.5mm, to block dust and impurities.

[0037] In addition, a second sealing gasket is provided between the other end face of the double-row tapered roller bearing 300 and the counterbore 101 of the tooth holder 100, and the thickness of the second sealing gasket is 0.8mm-2mm.

[0038] As a possible case, the first sealing gasket is made of wear-resistant rubber material with a Shore hardness of 60-80A, which can adapt to a certain degree of vibration and displacement during rotation of the cutting tooth 200, and always maintains close contact with the cutting tooth 200 and the end face of the double-row tapered roller bearing 300, thereby effectively blocking impurities from entering, while the hardness range can ensure sealing performance without causing excessive resistance to rotation of the cutting tooth 200. For example, when the hardness is 60A, the rubber is relatively soft, the sealing performance is good, but the wear resistance is relatively weak; when the hardness is 80A, the wear resistance is improved, but the flexibility decreases slightly, and in actual application, it needs to be selected according to the specific working conditions.

[0039] The second sealing gasket is made of polytetrafluoroethylene material, which has a very low friction coefficient to ensure the self-rotation performance of the cutting tooth 200, and at the same time, polytetrafluoroethylene has excellent corrosion resistance and chemical stability, which can maintain stable performance for a long time in harsh environments such as moisture and corrosive gases in coal mines, effectively preventing the sealing performance from being reduced due to chemical corrosion, thereby prolonging the service life of the sealing gasket and further improving the reliability and stability of the entire cutting system.

[0040] In an embodiment of the present application, the double-row tapered roller bearing 300 is filled with lubricating grease.

[0041] It should be noted that the double-row tapered roller bearing 300 is pre-filled with lubricating grease before installation, and the lubricating grease is lithium-based lubricating grease, and the filling amount is 1 / 3-1 / 2 of the internal space of the bearing, to ensure good lubrication of the double-row tapered roller bearing 300 during work.

[0042] Specifically, when the screw drum of the coal mining machine drives the cutting pick 200 to rotate to cut the coal wall, the cutting pick 200 is subjected to the reaction force of the coal wall, and since the cutting pick 200 and the double-row tapered roller bearing 300 are in interference fit, the cutting pick 200 can stably transmit the force to the double-row tapered roller bearing 300, and effectively transmit the radial and axial loads of the cutting pick 200 to the tooth holder 100 through the double-row tapered roller bearing 300.

[0043] The double-row tapered roller bearing 300 has good load bearing capacity and can bear large radial and axial loads, so that the stable operation of the cutting pick 200 in the cutting process can be ensured, and since the double-row tapered roller bearing 300 has a small friction coefficient, the cutting pick 200 is subjected to small frictional resistance in the rotating process, so that the self-rotation of the cutting pick 200 can be more easily generated in the case of uneven force (such as when cutting into a rock wall), so that the wear of the cutting pick 200 is more uniform, and the occurrence of the eccentric wear condition is avoided.

[0044] In summary, according to the assembling structure for preventing the eccentric wear of the cutting pick according to the embodiment of the utility model, the double-row tapered roller bearing 300 is arranged in the counterbore 101 of the tooth holder 100, and the cutting pick 200 is installed in the double-row tapered roller bearing 300, so that the large radial and axial loads that the cutting system can bear are effectively ensured, the cutting pick 200 can maintain high precision and rigidity in the rotating process, the probability of the breaking of the cutting pick 200 and the axial compression of the end surface of the tooth holder 100 due to uneven force is reduced, the stability and reliability of the cutting system are improved, and the complex force requirement in the coal mining operation is met.

[0045] In the description of the present specification, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include 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.

[0046] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0047] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that those skilled in the art can make changes, modifications, substitutions and variations to the above-described embodiments within the scope of the present application.

Claims

1. An assembly structure for preventing uneven wear of cutting teeth, characterized in that, include: Gear seat (100), cutting gear (200), and double-row tapered roller bearing (300), wherein, The tooth holder (100) has a countersunk hole (101) at its bottom; The double-row tapered roller bearing (300) is fitted into the countersunk hole (101); The shank of the cutting tooth (200) is disposed in the inner ring of the double-row tapered roller bearing (300), and the end of the cutting tooth (200) extends upward to the outside of the tooth seat (100) and is limited by a retaining ring (400).

2. The assembly structure for preventing uneven wear of cutting teeth according to claim 1, characterized in that, The double-row tapered roller bearing (300) includes an inner ring, an outer ring, double-row tapered rollers, and a cage, wherein, The double-row tapered rollers are disposed between the inner ring and the outer ring by a cage; The inner ring is adapted to the shank (201) of the cutting tooth (200); The outer ring is adapted to the countersunk hole (101) of the gear seat (100).

3. The assembly structure for preventing uneven wear of cutting teeth according to claim 1, characterized in that, A pre-reserved groove (102) is provided at the countersunk hole (101) of the gear seat (100), and the pre-reserved groove (102) is used to realize the mechanical disassembly of the double-row tapered roller bearing (300).

4. The assembly structure for preventing uneven wear of cutting teeth according to claim 1, characterized in that, A first sealing gasket is provided between the shoulder (202) end face of the cutting tooth (200) and the end face of the double-row tapered roller bearing (300). The thickness of the first sealing gasket is 0.5mm-1.5mm to block dust and impurities.

5. The assembly structure for preventing uneven wear of cutting teeth according to claim 1, characterized in that, A second sealing gasket is provided between the other end face of the double-row tapered roller bearing (300) and the countersunk hole (101) of the gear seat (100), and the thickness of the second sealing gasket is 0.8mm-2mm.

6. The assembly structure for preventing uneven wear of cutting teeth according to claim 1, characterized in that, The double-row tapered roller bearing (300) is filled with grease.

7. The assembly structure for preventing uneven wear of cutting teeth according to claim 1, characterized in that, The cutting teeth (200) are interference-fitted with the double-row tapered roller bearing (300) to prevent the cutting teeth (200) from loosening or shifting within the double-row tapered roller bearing (300).

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