Roller bit bearing and roller bit

Abstract

The utility model relates to a roller bit bearing and a roller bit, and the roller bit bearing comprises a large shaft neck, and the periphery of the large shaft neck is sleeved with a floating sleeve; and the small shaft neck is fixed to the large shaft neck, and a bit leg thrust block is fixed to the end, away from the large shaft neck, of the small shaft neck. By arranging the floating sleeve on the periphery of the large shaft neck in a sleeving mode, the contact area between the cone and the large shaft neck can be increased, stress of the cone can act on the large shaft neck in a dispersed mode through the floating sleeve, and the situation that the service life of the cone leg is affected due to the fact that local stress of the large shaft neck is too large is effectively prevented. And the tooth palm thrust block is mounted at one end of the small shaft neck, so that the friction speed between the tooth wheel and the small shaft neck can be effectively reduced, and the technical problem that the service life of the tooth palm is affected due to the fact that stress acting on the tooth palm shaft neck from the tooth wheel is relatively concentrated in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the fields of oil and gas drilling and mine drilling, and particularly relates to a roller bit bearing and a roller bit. Background Art

[0002] A roller bit is a drilling device, mostly used in large open-pit mines. It is an important tool in the mining field, having advantages such as a large drilling hole diameter and high perforation efficiency, and has become a commonly used perforation device in large and medium-sized open-pit mines. Under medium and heavy load conditions, the service life of the roller bit may be affected due to the friction temperature rise and relatively high friction speed between the roller cone and the bit leg during use.

[0003] In related technologies, in order to reduce the friction between the roller cone and the bit leg during the use of the roller bit, rollers are provided between the journal of the bit leg and the roller cone. However, the load-bearing capacity of the rollers is limited. When the roller bit is used in heavy load conditions, the stress acting on the journal of the bit leg from the roller cone is relatively concentrated, affecting the service life of the bit leg. Summary of the Invention

[0004] The present application provides a roller bit bearing and a roller bit, which can solve the technical problem that in related technologies, the load-bearing capacity of the rollers is limited, and when the roller bit is used in heavy load conditions, the stress acting on the journal of the bit leg from the roller cone is relatively concentrated, affecting the service life of the bit leg.

[0005] In a first aspect, an embodiment of the present application provides a roller bit bearing, which is characterized in that it includes: a large journal, a floating sleeve is sleeved on the outer periphery of the large journal; a small journal, the small journal is fixed to the large journal, and a bit leg thrust block is fixed to one end of the small journal away from the large journal.

[0006] In combination with the first aspect, in an embodiment, a seal is further sleeved on the outer periphery of the large journal, and the large journal has a stepped shaft, the stepped shaft and the seal are arranged at intervals along the axial direction of the large journal, and the floating sleeve is installed on the stepped shaft.

[0007] In combination with the first aspect, in an embodiment, the floating sleeve is made of non-ferrous metal materials including but not limited to beryllium bronze.

[0008] In combination with the first aspect, in an embodiment, the bit leg thrust block is made of cemented carbide material or high-speed steel.

[0009] In combination with the first aspect, in an embodiment, the roller bit bearing is provided with a perforation, and the bit leg thrust block is provided with a through groove, and the through groove is communicated with the perforation.

[0010] In combination with the first aspect, in one embodiment, a ring groove is formed on one side of the large journal near the small journal. The ring groove surrounds the outer circumference of the large journal, and balls are installed in the ring groove. The balls are arranged at an axial interval from the floating sleeve along the large journal.

[0011] In combination with the first aspect, in one embodiment, the large journal is further provided with a pin hole which communicates with the ring groove, and a plug pin is arranged in the pin hole.

[0012] In combination with the first aspect, in one embodiment, the palm thrust block is of a polygonal structure.

[0013] In a second aspect, an embodiment of the present application provides a roller bit, which includes the above-mentioned roller bit bearing. The roller bit further includes a roller, the roller is installed on the roller bit bearing, and a roller thrust block which cooperates with the palm thrust block is fixed on the roller.

[0014] In combination with the second aspect, in one embodiment, the roller thrust block is made of cemented carbide material or high-speed steel.

[0015] The beneficial effects brought by the technical solution provided by the embodiment of the present application include:

[0016] By sleeving a floating sleeve on the outer circumference of the large journal, the contact area between the roller and the large journal can be increased, so that the stress of the roller can act on the large journal more dispersedly through the floating sleeve, effectively preventing the service life of the palm from being affected due to excessive local stress of the large journal. And installing a palm thrust block at one end of the small journal can effectively reduce the friction speed between the roller and the small journal, solving the technical problem in the related art that the stress acting on the palm journal from the roller is relatively concentrated and affects the service life of the palm. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a partial structural schematic diagram of the roller bit provided by the embodiment of the present application;

[0019] Figure 2 It is a structural schematic diagram of the roller bit bearing provided by the embodiment of the present application;

[0020] Figure 3 It is a three-dimensional structural schematic diagram of the palm thrust block provided by the embodiment of the present application;

[0021] Figure 4 Schematic three-dimensional structure diagram of the cone thrust block provided by the embodiment of the present application;

[0022] Figure 5 Schematic three-dimensional structure diagram of the floating sleeve provided by the embodiment of the present application;

[0023] Figure 6 Schematic diagram of the sealing structure using a rubber seal provided by the embodiment of the present application;

[0024] Figure 7 Schematic diagram of the sealing structure using a metal seal provided by the embodiment of the present application.

[0025] In the figure:

[0026] 1. Large journal; 11. Step shaft; 12. Ring groove; 13. Pin hole;

[0027] 2. Small journal;

[0028] 3. Floating sleeve;

[0029] 4. Bit leg thrust block; 41. Through groove;

[0030] 5. Seal;

[0031] 6. Ball;

[0032] 7. Plug pin;

[0033] 8. Cone;

[0034] 9. Cone thrust block. Detailed implementation manners

[0035] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0036] The embodiment of the present application provides a cone bit bearing, which can solve the technical problem that the load-bearing capacity of the rollers in the related art is limited, and when the cone bit is applied in heavy load working conditions, the stress acting on the bit leg journal from the cone is relatively concentrated, affecting the service life of the bit leg.

[0037] See Figure 2 and Figure 5As shown, a roller drill bit bearing provided in an embodiment of the present application may include: a large journal 1, the outer peripheral sleeve of the large journal 1 is provided with a floating sleeve 3, a roller 8 may be installed on the roller drill bit bearing, and a part of the roller 8 is spaced apart from the large journal 1 by the floating sleeve 3; a small journal 2, the small journal 2 is fixed to the large journal 1, and a tooth palm thrust block 4 is fixed to the end of the small journal 2 away from the large journal 1, and preferably, the tooth palm thrust block 4 can be fixed at the center position of the small journal 2.

[0038] The embodiment of the present application can increase the contact area between the gear 8 and the large shaft neck 1 by sleeve-arranging a floating sleeve 3 on the outer periphery of the large shaft neck 1, so that the stress of the gear 8 can act on the large shaft neck 1 in a relatively dispersed manner through the floating sleeve 3, that is, the gear 8 transmits the stress to the floating sleeve 3, and then transmits it from the floating sleeve 3 to the large shaft neck 1, and the friction pair between the floating sleeve 3 and the large shaft neck 1 at this time is a sliding pair, which can increase the bearing capacity of the large shaft neck 1 compared with the rolling pair, and the floating sleeve 3 changes the one pair of friction pairs acting on the large shaft neck 1 by the gear 8 into two pairs of friction pairs, thereby reducing the friction of the bearing under medium and heavy load conditions. The friction temperature rises, and the bearing capacity of the roller drill bit bearing is greatly increased, which effectively prevents the service life of the tooth palm from being affected by the excessive local stress of the large shaft neck 1. In addition, a high-hardness tooth palm thrust block 4 is installed at one end of the small shaft neck 2, which can effectively reduce the friction speed and wear rate between the roller 8 and the small shaft neck 2. When the roller 8 is installed on the roller drill bit bearing, the roller 8 and part of the small shaft neck 2 are rubbed through the tooth palm thrust block 4, which can have a higher bearing capacity, and solves the technical problem in the related technology that the stress acting from the roller 8 on the tooth palm shaft neck is relatively concentrated, affecting the service life of the tooth palm.

[0039] In some optional embodiments, the outer periphery of the large journal 1 is also sleeved with a seal 5, and the large journal 1 has a stepped shaft 11, the stepped shaft 11 and the seal 5 are spaced apart along the axial direction of the large journal 1, the floating sleeve 3 is installed on the stepped shaft 11, and the diameter of the large journal 1 where the floating sleeve 3 is installed is smaller than the diameter of the large journal 1 where the seal 5 is installed. In the embodiment of the present application, the floating sleeve 3 and the seal 5 are spaced apart by the stepped shaft 11 to reduce the contact between the floating sleeve 3 and the seal 5 as much as possible, and when the floating sleeve 3 is squeezed and deformed by the cone 8 and the large journal 1, it is also prevented from interfering with the seal 5 as much as possible. Installing the floating sleeve 3 on the outer periphery of the stepped shaft 11 can increase the installation space of the floating sleeve 3, further enhance the working stability of the cone drill bit bearing, and refer to Figure 6 and Figure 7As shown, the seal 5 can be a rubber seal 5 or a metal seal 5, etc. When a rubber seal 5 is used, a rectangular seal groove can be opened at the large journal 1, and the O-ring rubber seal is installed in the rectangular seal groove; when a metal seal 5 is used, it can be a single-metal seal or a double-metal seal. When a double-metal seal is used, two O-ring rubber energy supply rings and two metal seal rings can be provided.

[0040] In some alternative embodiments, the floating sleeve 3 is made of non-ferrous metal materials including but not limited to beryllium bronze. Using non-ferrous metal materials such as beryllium bronze can effectively enhance the strength and durability of the floating sleeve 3 and extend the service life of the roller bit bearing.

[0041] In some alternative embodiments, the bearing pad 4 of the roller cone is made of cemented carbide or high-speed steel. Using cemented carbide or high-speed steel for the bearing pad 4 of the roller cone can enhance the wear resistance of the bearing pad 4 and maintain the stability of the installation space of floating components such as the bearing pad 4, avoiding extrusion deformation of the floating sleeve 3 in the case of bearing wear and swing, and comprehensively improving the service life of the roller bit bearing.

[0042] See Figure 3 As shown, in some alternative embodiments, the roller bit bearing is provided with a perforation, and the bearing pad 4 of the roller cone is provided with a through groove 41. The through groove 41 communicates with the perforation. When the drill bit is installed in the roller bit bearing, lubricating oil can be poured into the bearing pad 4 from the perforation and the through groove 41, so that the relative sliding between the bearing pad 4 and the roller 8 can be smoother, and the friction between the bearing pad 4 and the roller 8 can be further reduced.

[0043] In some alternative embodiments, a ring groove 12 is formed on one side of the large journal 1 close to the small journal 2. The ring groove 12 surrounds the outer periphery of the large journal 1, and a ball 6 is installed in the ring groove 12. The ball 6 and the floating sleeve 3 are arranged at intervals along the axial direction of the large journal 1. The balls 6 can be arranged in a complete circle around the outer periphery of the large journal 1. The arrangement of the balls 6 can lock the large journal 1 and the cone 8 to prevent relative displacement and reduce swing. In the embodiments of the present application, the number of the balls 6 is set to 16. Since the large journal 1 is provided with a stepped shaft 11, the seal 5, the floating sleeve 3 and the ring groove 12 can be regarded as being respectively arranged on different stepped platforms. The side of the stepped shaft 11 where the floating sleeve 3 is close to the seal 5 is regarded as the first boss, then a second boss can also be provided on the stepped shaft 11 on the side where the floating sleeve 3 is close to the ring groove 12. The first boss and the second boss can have the same height so that the floating sleeve 3 can be accommodated between the first boss and the second boss. Preferably, the distance between the first boss and the second boss is not less than the width of the floating sleeve 3 along the axial direction of the large journal 1. In the embodiments of the present application, the width of the floating sleeve 3 is set to 27.4 mm, and the distance between the first boss and the second boss is set to 27.8 mm.

[0044] In some alternative embodiments, the large journal 1 is further provided with a pin hole 13. The pin hole 13 communicates with the ring groove 12, and a plug pin 7 is arranged in the pin hole 13. Both ends of the pin hole 13 can be through holes. The balls 6 can be assembled into the ring groove 12 through the pin hole 13 so that the balls 6 will not fall out of the ring groove 12 from the side far from the large bearing, and the balls 6 can be assembled relatively easily. After the balls 6 are loaded, the plug pin 7 can be inserted to prevent the balls 6 from slipping out of the ring groove 12 through the pin hole 13 again, and lubricating oil can also be poured into the balls 6 through the pin hole 13.

[0045] Preferably, the cone thrust block 4 has a polygonal structure, and the small journal 2 can be matched with it by using a cylindrical hole. The polygonal edges on the outer periphery of the cone thrust block 4 and the cylindrical hole are fixed by interference fit, reducing the possibility of relative sliding between the two and making the cone bit bearing work more stably.

[0046] See Figure 1 As shown, the embodiments of the present application further provide a cone bit, which includes the cone bit bearing as described above. The cone bit further includes a cone 8. The cone 8 is installed on the cone bit bearing, and a cone thrust block 9 that cooperates with the cone thrust block 4 is fixed on the cone 8. See Figure 4As shown, the cone thrust block 9 can also be set as a polygonal structure to achieve the same effect as the leg thrust block 4. The cone thrust block 9 is also fixed at the center of the cone 8. When the cone 8 is installed on the cone bit bearing, the cone thrust block 9 cooperates with the leg thrust block 4, which can have a lower friction speed and wear rate, and has a higher load-bearing capacity. It can effectively delay the wear of key parts such as the thrust surface of the cone bit bearing, the ball 6, and the annular groove 12, ensure the continuous stability of the installation space of the floating sleeve 3, and reduce the possibility of reducing the sealing life between the cone bit bearing and the cone 8 caused by early swing of the cone bit bearing, extrusion deformation of the end face of the floating sleeve 3, etc.

[0047] Preferably, the cone thrust block 9 is made of cemented carbide or high-speed steel, and both the leg thrust block 4 and the cone thrust block 9 are made of cemented carbide or high-speed steel materials, which can enhance the wear resistance between the leg thrust block 4 and the cone thrust block 9 and effectively delay the wear of the thrust surface part.

[0048] In the embodiment of the present application, by setting the floating sleeve 3, the leg thrust block 4, and the cone thrust block 9, the axial wear resistance of the cone bit bearing can be improved. The large journal 1 of the cone bit bearing adopts the floating sleeve 3 structure, which can improve the radial load-bearing capacity of the cone bit bearing. The leg thrust block 4 at the end face of the small journal 2 cooperates with the floating sleeve 3 of the large journal 1, which can effectively delay the wear of parts such as the thrust surface and the annular groove 12, ensure the continuous stability of the installation space of the floating sleeve 3, and avoid the reduction of the cone bit bearing and the sealing life caused by early swing of the cone bit bearing and extrusion deformation of the end face of the floating sleeve 3 by the axial pressure of the cone bit bearing.

[0049] In the embodiment of the present application, a thrust-strengthened floating sleeve 3 cone bit bearing with a drill bit diameter of 250.83 mm (9 7 / 8") is set. The floating sleeve 3 is made of beryllium bronze. During the use of the cone bit, first connect the thread on the upper part of the drill bit with the thread on the drill tool such as the drill pipe or the screw drill. Drive the cone bit with a rotary table or a top drive, or drive the cone bit with downhole tools such as a screw drill. The cone bit rotates and moves along a predetermined route. Under the action of the axial pressure of the drill tool, the cutting teeth on the cone 8 continuously impact the rock, and then break the rock to form the required wellbore. The rock generates a reaction force on the cone 8. The cone 8 rotates under the drive of the cone bit bearing, and the rotation direction of the cone 8 is opposite to the rotation direction of the cone bit bearing. The large journal 1, the small journal 2, and the thrust surface of the cone bit bearing transfer the load. The large journal 1 bears most of the load, and the mutual friction surface of the cone thrust block 9 and the leg thrust block 4 is a complete plane.

[0050] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0051] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0052] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A roller drill bit bearing, characterized in that: It includes: A large journal (1), wherein the outer peripheral sleeve of the large journal (1) is provided with a floating sleeve (3); A small journal (2) is fixed to the large journal (1), and a tooth palm thrust block (4) is fixed to one end of the small journal (2) away from the large journal (1).

2. The roller drill bit bearing according to claim 1, characterized in that: The outer periphery of the large journal (1) is also sleeved with a seal (5), and the large journal (1) has a stepped shaft (11), the stepped shaft (11) and the seal (5) are spaced apart along the axial direction of the large journal (1), and the floating sleeve (3) is installed on the stepped shaft (11).

3. The roller drill bit bearing according to claim 1, characterized in that: The floating sleeve (3) is made of non-ferrous metal materials including but not limited to beryllium bronze.

4. The roller drill bit bearing according to claim 1, characterized in that: The tooth palm thrust block (4) is made of hard alloy material or high-speed steel.

5. The roller drill bit bearing according to claim 1, characterized in that: The roller drill bit bearing is provided with a through hole, and the tooth palm thrust block (4) is provided with a through groove (41), and the through groove (41) is communicated with the through hole.

6. The roller drill bit bearing according to claim 1, characterized in that: A ring groove (12) is provided on one side of the large journal (1) close to the small journal (2). The ring groove (12) is arranged around the outer circumference of the large journal (1), and a ball (6) is installed in the ring groove (12). The ball (6) and the floating sleeve (3) are arranged at intervals along the axial direction of the large journal (1).

7. The roller drill bit bearing according to claim 6, characterized in that: The large journal (1) is also provided with a pin hole (13), the pin hole (13) is communicated with the annular groove (12), and a plug pin (7) is provided in the pin hole (13).

8. The roller drill bit bearing according to claim 1, characterized in that: The tooth palm thrust block (4) is a polygonal structure.

9. A roller cone (8) drill bit, characterized in that: It comprises a roller drill bit bearing as claimed in any one of claims 1 to 8, The roller cone (8) drill bit also includes a roller cone (8), the roller cone (8) is mounted on the roller cone drill bit bearing, and the roller cone (8) is fixed with a roller cone thrust block (9) that cooperates with the tooth palm thrust block (4).

10. The roller cone (8) drill bit according to claim 9, characterized in that: The gear thrust block (9) is made of hard alloy material or high-speed steel.

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