CN114576274A - Sliding bearing structure of hobbing cutter for breaking rock of extremely hard rock - Google Patents
Sliding bearing structure of hobbing cutter for breaking rock of extremely hard rock Download PDFInfo
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- CN114576274A CN114576274A CN202210149736.XA CN202210149736A CN114576274A CN 114576274 A CN114576274 A CN 114576274A CN 202210149736 A CN202210149736 A CN 202210149736A CN 114576274 A CN114576274 A CN 114576274A
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- oil hole
- end cover
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- 239000011435 rock Substances 0.000 title claims abstract description 48
- 238000007789 sealing Methods 0.000 claims abstract description 56
- 239000012530 fluid Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 7
- 238000005096 rolling process Methods 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 53
- 239000010687 lubricating oil Substances 0.000 description 14
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N37/00—Equipment for transferring lubricant from one container to another
- F16N37/003—Equipment for transferring lubricant from one container to another for filling bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention discloses a hobbing cutter sliding bearing structure for breaking rock of extremely hard rock, which comprises a cutter shell, a main shaft, a first end cover and a second end cover, wherein the cutter shell is coaxially sleeved on the main shaft, the first end cover and the second end cover are respectively installed at two ends of the cutter shell and are respectively in sealing fit with two ends of the main shaft, bearing seats are respectively arranged in two ends of the cutter shell, bearing bushes are respectively sleeved at two ends of the surface of the main shaft, the bearing bushes are in running fit in the corresponding bearing seats, and the inner walls of the bearing bushes are in running fit with the surface of the main shaft. According to the invention, the two bearing bushes and the bearing block are arranged and supported in a sliding support mode, so that compared with the traditional rolling bearing, the running stability under high load accompanied with vibration impact is greatly improved, and the overall service life is prolonged; the length of the bearing bush at the large-diameter end of the cutter shell is larger than that of the bearing bush at the small-diameter end of the cutter shell, so that the cutter shell can stably bear the positive pressure of rock breaking of the hob and the thrust for driving the hob to rotate.
Description
Technical Field
The invention relates to the technical field of rock breaking hobs. In particular to a sliding bearing structure of a hobbing cutter for breaking extremely hard rock.
Background
The rock breaking hob is a core component for mechanical rock breaking. A plurality of rock breaking hobs are arranged on a reamer head of a raise boring machine, under the combined action of the driving of the reamer head and the contact of bottom-hole rocks and hob cutter teeth, the hobs rotate around cutter shafts, the cutter teeth of the hobs impact, extrude and scrape the rocks in sequence, the rocks are broken, and fragments are separated from the rocks to form a cylindrical space structure of the raise boring machine.
The existing hob shell and the hob shaft are usually connected by a rolling bearing, and the hob is subjected to a large load accompanied with impact and vibration in the drilling process of a hard rock stratum. Under the repeated action of contact stress, failure modes such as pitting corrosion, fatigue peeling and the like are easy to occur on the surface of the rolling bearing ring and the surface of the rolling body, so that the service life and the working progress of the hob are influenced.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a sliding bearing structure of a hobbing cutter for breaking rock of extremely hard rock, which has high bearing capacity and stable and reliable work.
In order to solve the technical problems, the invention provides the following technical scheme: a sliding bearing structure of a hobbing cutter for breaking rock of extremely hard rock comprises a cutter shell, a main shaft, a first end cover and a second end cover, wherein the cutter shell is coaxially sleeved on the main shaft, the first end cover and the second end cover are respectively installed at two ends of the cutter shell and are respectively in sealing fit with two ends of the main shaft, bearing seats are respectively arranged in two ends of the cutter shell, bearing bushes are respectively sleeved at two ends of the surface of the main shaft and are in rotating fit in the corresponding bearing seats, the inner wall of each bearing bush is in rotating fit with the surface of the main shaft, a gap between the inner wall of each bearing bush and the main shaft is smaller than a gap between the outer wall of each bearing bush and each bearing seat, and a wear-resistant material is arranged at a loaded position where the surface of the main shaft is contacted with the bearing bushes; an axial oil hole is formed in the main shaft along the axial direction of the main shaft, the axial oil hole is communicated with space fluid between the cutter shell and the main shaft, a movable piston column is arranged in the axial oil hole, and the side wall of the piston column is in sliding sealing fit with the inner side wall of the axial oil hole.
In the sliding bearing structure of the hob for breaking rock of the extremely hard rock, the shape of the cutter shell is frustum-shaped, and the length of the bearing bush positioned in the end with the larger outer diameter of the cutter shell is larger than that positioned in the end with the smaller outer diameter of the cutter shell; the bearing seat length is greater than the bearing seat length in the smaller end of the outer diameter of the cutter shell, the first end cover is arranged on the smaller end of the outer diameter of the cutter shell, and the second end cover is arranged on the larger end of the outer diameter of the cutter shell.
According to the sliding bearing structure of the hobbing cutter for breaking the rock of the extremely hard rock, the threaded plug with the hole is hermetically installed in one end of the axial oil hole, the plunger is hermetically installed in the other end of the axial oil hole, the shoulder tip cone is coaxially fixed on one end of the plunger, which is located in the axial oil hole, and the diameter of the shoulder tip cone is smaller than the inner diameter of the axial oil hole; the piston column is coaxially arranged in the axial oil hole, a sealing ring is sleeved on the piston column, the outer wall of the sealing ring is in sealing fit with the inner wall of the axial oil hole, and a threaded hole is formed in the end face, close to the first end cover, of the piston column; a radial oil hole is formed in the main shaft along the radial direction of the main shaft, the radial oil hole is close to the second end cover, the axis of the radial oil hole is opposite to the middle of the shoulder tip cone, one end of the radial oil hole is in fluid communication with the axial oil hole, and the other end of the radial oil hole is in fluid communication with a space between the cutter shell and the main shaft; an air outlet is formed in the side wall of the first end cover, fluid is conducted between the air outlet and the space between the cutter shell and the main shaft, and a sealing plug is installed in the air outlet.
According to the sliding bearing structure of the hob for breaking the extremely hard rock, the gap between the inner wall of the bearing bush and the main shaft is 0.1-0.2mm smaller than the gap between the outer wall of the bearing bush and the bearing block.
Above-mentioned rock hobbing cutter sliding bearing structure is broken to extremely hard rock, seted up the crescent moon groove on the lateral wall face of main shaft, wear-resisting material is filled in the crescent moon groove.
Above-mentioned broken rock hobbing cutter sliding bearing structure of extremely hard rock, the centre of main shaft is provided with the bearing circular bead, the main shaft is located thrust bearing is all installed, two on the both sides of bearing circular bead the outside wall of thrust bearing supports respectively two a side wall that the bearing frame is close to each other.
According to the sliding bearing structure of the hobbing cutter for breaking the rock of the extremely hard rock, the spherical teeth are distributed on the conical surface of the cutter shell, and the flat teeth are distributed on one end of the cutter shell with the larger outer diameter.
In the sliding bearing structure of the hobbing cutter for breaking the extremely hard rock, the end with the larger outer diameter of the cutter shell is internally provided with the threaded sleeve, and the second end cover is arranged in the threaded sleeve; end face sealing rings are respectively lapped on the end faces, far away from each other, of the two bearing blocks, a second sealing ring is in sealing fit between the first end cover and one end face sealing ring, and a second sealing ring is also in sealing fit between the second end cover and the other end face sealing ring; the two ends of the main shaft are respectively matched with first sealing rings in a sealing mode, one first sealing ring is pressed between the first end cover and the corresponding bearing bush, and the other first sealing ring is pressed between the second end cover and the corresponding bearing bush.
The technical scheme of the invention achieves the following beneficial technical effects:
1. by arranging the two bearing bushes and the bearing block and supporting in a sliding supporting mode, compared with the traditional rolling bearing, the high-load vibration-impact-combined rolling bearing greatly improves the operation stability under high load and vibration impact, and prolongs the whole service life; the length of the bearing bush at the large-diameter end of the cutter shell is larger than that of the bearing bush at the small-diameter end of the cutter shell, so that the cutter shell can stably bear the positive pressure of rock breaking of the hob and the thrust for driving the hob to rotate.
2. The inner wall and the main shaft sliding fit of axle bush, the outer wall of axle bush and the inner wall sliding fit of bearing frame form two friction pairs, and conventional axle bush only has a friction surface, and the cutter housing rotates the round, and the axle bush also can rotate the round, and the axle bush in this patent is owing to have two friction surfaces, and the cutter housing rotates the round, and the axle bush only rotates the half-turn, greatly reduced the vice relative slip speed of friction, reduce the wearing and tearing volume to very big improvement life.
3. The clearance between the inner wall of the bearing bush and the main shaft is smaller than the clearance between the outer wall of the bearing bush and the bearing seat, and because the torque applied to the inner and outer friction surfaces of the bearing bush is different, the friction force capable of balancing the inner and outer friction surfaces is set, so that the service lives of the two surfaces of the bearing bush are close, and the condition of eccentric wear or excessive wear of one side is avoided.
4. The main shaft and the two sides of the cutter shell are sealed, lubricating oil is injected through the axial oil hole to sequentially lubricate gaps among the main shaft, the bearing bush and the bearing block, so that the friction force among friction surfaces is greatly reduced, and the service life is prolonged; when lubricating oil expend with heat and contract with cold, can utilize the displacement balance lubricating oil's of piston post pressure, prevent effectively that lubricating oil from revealing or lubricated not enough, further improve life.
5. And the wear-resistant material is surfacing-welded on the stressed side of the main shaft, so that the wear resistance of the stressed contact surface of the main shaft and the bearing bush is ensured when the hob works, and the service life of the main shaft is prolonged.
Drawings
FIG. 1 is a schematic front sectional view of the present invention;
FIG. 2 is a schematic cross-sectional view of the present invention.
In the figures, the reference numbers are given by: 1-a knife shell; 2-flat teeth; 3-spherical teeth; 4-a main shaft; 5, bearing bush; 6, bearing seats; 7-a first sealing ring; 8-a first end cap; 9-a second sealing ring; 10-end face sealing ring; 11-a plug screw with a hole; 12-a piston column; 13-a plunger; 131-shoulder tip cone; 14-axial oil holes; 15-a thrust bearing; 16-a threaded sleeve; 17-a second end cap; 18-a wear resistant material; 19-an exhaust port; and 20-radial oil hole.
Detailed Description
In this embodiment, as shown in fig. 1 and 2, the sliding bearing structure of the extremely hard rock breaking hob comprises a hob case 1, a main shaft 4, a first end cover 8 and a second end cover 17, wherein the hob case 1 is coaxially sleeved on the main shaft 4, the first end cover 8 and the second end cover 17 are respectively installed at two ends of the hob case 1 and are respectively in sealing fit with two ends of the main shaft 4, bearing seats 6 are respectively arranged in two ends of the hob case 1, bearing bushes 5 are respectively sleeved at two ends of the surface of the main shaft 4, the bearing bushes 5 are rotatably fitted in the corresponding bearing seats 6, the inner wall of each bearing bush 5 is rotatably fitted with the surface of the main shaft 4, and the bearing bushes and the bearing seats are slidably supported by providing two bearing bushes, so that compared with a conventional rolling bearing, the sliding bearing structure greatly improves the operation stability under high load and accompanied with vibration impact, and the whole service life is prolonged; the length of the bearing bush at the large-diameter end of the cutter shell is larger than that of the bearing bush at the small-diameter end of the cutter shell, so that the cutter shell can stably bear the positive pressure of the hob for breaking rock and the thrust for driving the hob to rotate; the inner wall and the main shaft sliding fit of axle bush, the outer wall of axle bush and the inner wall sliding fit of bearing frame form two friction pairs, and conventional axle bush only has a friction surface, and the sword shell rotates the round, and the axle bush also can rotate the round, and the axle bush in this patent is owing to have two friction surfaces, and the sword shell rotates the round, and the axle bush only rotates half a circle, greatly reduced the vice relative sliding velocity of friction, reduce the wearing and tearing volume to very big improvement life.
The clearance between the inner wall of the bearing bush 5 and the main shaft 4 is smaller than the clearance between the outer wall of the bearing bush 5 and the bearing seat 6, the clearance between the inner wall of the bearing bush 5 and the main shaft 4 is smaller than the clearance between the outer wall of the bearing bush 5 and the bearing seat 6 by 0.1-0.2mm, the clearance between the inner wall of the bearing bush and the main shaft is smaller than the clearance between the outer wall of the bearing bush and the bearing seat, and because the moments of the inner friction surface and the outer friction surface of the bearing bush are different, the friction force capable of balancing the inner friction surface and the outer friction surface is set, so that the service lives of two surfaces of the bearing bush are close, and the condition of eccentric wear or excessive wear of one side is avoided; a wear-resistant material 18 is arranged at a loaded position where the surface of the main shaft 4 is in contact with the bearing bush 5, a crescent groove is formed in the side wall surface of the main shaft 4, the wear-resistant material 18 is filled in the crescent groove, and the wear-resistant material is subjected to surfacing welding on the loaded side of the main shaft, so that the wear resistance of the loaded contact surface of the main shaft and the bearing bush is ensured when the hob works, and the service life of the main shaft is prolonged; an axial oil hole 14 is formed in the main shaft 4 along the axial direction of the main shaft, the axial oil hole 14 is communicated with space fluid between the cutter shell 1 and the main shaft 4, a piston column 12 is movably arranged in the axial oil hole 14, the side wall of the piston column 12 is in sliding sealing fit with the inner side wall of the axial oil hole 14, the main shaft and the two sides of the cutter shell are both arranged in a sealing mode, lubricating oil is injected through the axial oil hole to sequentially lubricate gaps among the main shaft, a bearing bush and a bearing seat, so that the friction force among friction surfaces is greatly reduced, and the service life is prolonged; when lubricating oil expend with heat and contract with cold, can utilize the displacement balance lubricating oil's of piston post pressure, prevent effectively that lubricating oil from revealing or lubricated not enough, further improve life.
A bearing shoulder is arranged in the middle of the main shaft 4, thrust bearings 15 are respectively installed on two sides of the main shaft 4, which are positioned on the bearing shoulder, and the outer side wall surfaces of the two thrust bearings 15 are respectively used for supporting one side wall surface of the two bearing seats 6, which are close to each other; spherical teeth 3 are distributed on the conical surface of the cutter shell 1, and flat teeth 2 are distributed on one end of the cutter shell 1 with larger outer diameter.
The cutter shell 1 is in a frustum shape, and the length of the bearing bush 5 positioned in the end with the larger outer diameter of the cutter shell 1 is larger than that of the bearing bush positioned in the end with the smaller outer diameter of the cutter shell 1; the length of the bearing seat 6 positioned in the end with the larger outer diameter of the cutter housing 1 is greater than that of the bearing seat 6 positioned in the end with the smaller outer diameter of the cutter housing 1, the first end cover 8 is arranged on the end with the smaller outer diameter of the cutter housing 1, and the second end cover 17 is arranged on the end with the larger outer diameter of the cutter housing 1; a threaded plug 11 with a hole is hermetically installed in one end of the axial oil hole 14, a plunger 13 is hermetically installed in the other end of the axial oil hole 14, a shoulder tip cone 131 is coaxially fixed on one end of the plunger 13 located in the axial oil hole 14, and the diameter of the shoulder tip cone 131 is smaller than the inner diameter of the axial oil hole 14; the piston column 12 is coaxially installed in the axial oil hole 14, a sealing ring is sleeved on the piston column 12, the outer wall of the sealing ring is in sealing fit with the inner wall of the axial oil hole 14, and a threaded hole is formed in the end face, close to the first end cover 8, of the piston column 12; a radial oil hole 20 is formed in the main shaft 4 along the radial direction of the main shaft, the radial oil hole 20 is close to the second end cover 17, the axis of the radial oil hole 20 is opposite to the middle of the shoulder tip cone 131, one end of the radial oil hole 20 is in fluid communication with the axial oil hole 14, and the other end of the radial oil hole 20 is in fluid communication with the space between the cutter housing 1 and the main shaft 4; an air outlet 19 is formed in the side wall of the first end cover 8, the air outlet 19 is communicated with space fluid between the cutter housing 1 and the spindle 4, and a sealing plug is installed in the air outlet 19.
A threaded sleeve 16 is arranged in one end of the cutter shell 1 with larger outer diameter, and a second end cover 17 is arranged in the threaded sleeve 16; end face sealing rings 10 are respectively lapped on the end faces, far away from each other, of the two bearing blocks 6, a second sealing ring 9 is in sealing fit between the first end cover 8 and one end face sealing ring 10, and a second sealing ring 9 is also in sealing fit between the second end cover 17 and the other end face sealing ring 10; the two ends of the main shaft 4 are respectively matched with a first sealing ring 7 in a sealing way, one first sealing ring 7 is tightly pressed between the first end cover 8 and the corresponding bearing bush 5, and the other first sealing ring 7 is tightly pressed between the second end cover 17 and the corresponding bearing bush 5.
The working principle is as follows: during oil injection, firstly, a threaded plug 11 with a hole is screwed off, then a screw rod is inserted into the axial oil hole 14, then the end part of the screw rod is screwed into a threaded hole on the end surface of the piston column 12 to realize connection, the piston column 12 is pulled out by drawing the screw rod, an oil injection pipe of the oil injection equipment is connected with the axial oil hole 14, the oil injection equipment is started, lubricating oil is injected into the axial oil hole 14 and flows into a space between the cutter housing 1 and the main shaft 4 through the radial oil hole 20, under the action of oil pressure, permeation and lubrication are carried out between the bearing bush 5 and the main shaft 4 and between the bearing bush 5 and the bearing seat 6, and when the exhaust port 19 continuously and uniformly flows out in the exhaust port 19, the lubricating oil is fully injected, and the oil injection is stopped;
after the oil injection is finished, an oil injection pipe of the oil injection device is detached, then the piston column 12 is installed in the axial oil hole 14 through the screw rod, the piston column 12 is pushed to a position close to the middle of the main shaft 4, then the screw rod is rotated, the screw rod is taken down and pulled out, and the screw plug 11 with the hole is installed on the axial oil hole 14 again; when the hob works, along with continuous friction, the temperature of lubricating oil rises, the volume increases, the piston column 12 is pushed to move towards the first end cover 8 side, when the temperature decreases, the volume of the lubricating oil decreases, the piston column 12 is pulled to move towards the second end cover 17 side, along with continuous consumption of the lubricating oil, the piston column 12 can be continuously close to the second end cover 17 until the piston column 12 abuts against the shoulder tip cone 131, the shoulder tip cone 131 can prevent the piston column 12 from crossing the radial oil hole 20, a limiting effect is achieved, the lubricating oil is prevented from reversely leaking through the radial oil hole 20, and external dirt is prevented from entering the lubricating surface; when the hob is operated in a rotating manner, the pressure applied to the hob housing 1 acts on the main shaft 4, and the wear-resistant material 18 is located at the friction position, so that the service life is prolonged.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.
Claims (8)
1. The utility model provides a broken rock hobbing cutter sliding bearing structure of extreme hard rock, its characterized in that, includes cutter housing (1), main shaft (4), first end cover (8) and second end cover (17), cutter housing (1) coaxial cover is in on main shaft (4), first end cover (8) and second end cover (17) are installed respectively on the both ends of cutter housing (1) and respectively with the both ends sealing fit of main shaft (4), all be provided with bearing frame (6) in the both ends of cutter housing (1), all overlap on the surperficial both ends of main shaft (4) and have axle bush (5), axle bush (5) normal running fit is in corresponding in bearing frame (6), the inner wall of axle bush (5) with the surperficial normal running fit of main shaft (4), the clearance between axle bush (5) inner wall and main shaft (4) is less than the clearance between axle bush (5) outer wall and bearing frame (6), a wear-resistant material (18) is arranged at a loaded position where the surface of the main shaft (4) is contacted with the bearing bush (5); an axial oil hole (14) is formed in the main shaft (4) along the axial direction of the main shaft, the axial oil hole (14) is communicated with space fluid between the cutter shell (1) and the main shaft (4), a piston column (12) is movably arranged in the axial oil hole (14), and the side wall of the piston column (12) is in sliding sealing fit with the inner side wall of the axial oil hole (14).
2. A sliding bearing structure of a hob cutter for breaking rock of extremely hard rock according to claim 1, characterized in that the shape of the cutter housing (1) is frustum-shaped, and the length of the bearing bush (5) located in the end of the cutter housing (1) with larger outer diameter is larger than the length of the bearing bush located in the end of the cutter housing (1) with smaller outer diameter; be located in the great one end of sword shell (1) external diameter bearing frame (6) length is greater than and is located in the less one end of sword shell (1) external diameter bearing frame (6) length, install first end cover (8) are served in the less one of sword shell (1) external diameter, install second end cover (17) are served in the great one of sword shell (1) external diameter.
3. The sliding bearing structure of the extremely hard rock breaking hob according to claim 2, characterized in that a perforated plug screw (11) is hermetically installed in one end of the axial oil hole (14), a plunger (13) is hermetically installed in the other end of the axial oil hole (14), a shoulder tip cone (131) is coaxially fixed on one end of the plunger (13) located in the axial oil hole (14), and the diameter of the shoulder tip cone (131) is smaller than the inner diameter of the axial oil hole (14); the piston column (12) is coaxially arranged in the axial oil hole (14), a sealing ring is sleeved on the piston column (12), the outer wall of the sealing ring is in sealing fit with the inner wall of the axial oil hole (14), and a threaded hole is formed in the end face, close to the first end cover (8), of the piston column (12); a radial oil hole (20) is formed in the main shaft (4) along the radial direction of the main shaft, the radial oil hole (20) is close to the second end cover (17), the axis of the radial oil hole (20) is opposite to the middle of the shoulder tip cone (131), one end of the radial oil hole (20) is in fluid communication with the axial oil hole (14), and the other end of the radial oil hole (20) is in fluid communication with a space between the cutter shell (1) and the main shaft (4); an air outlet (19) is formed in the side wall of the first end cover (8), the air outlet (19) is communicated with space fluid between the cutter shell (1) and the main shaft (4), and a sealing plug is installed in the air outlet (19).
4. A roller cutter sliding bearing structure for breaking rock in extremely hard rock according to claim 1, characterized in that the clearance between the inner wall of the bearing shell (5) and the main shaft (4) is 0.1-0.2mm smaller than the clearance between the outer wall of the bearing shell (5) and the bearing housing (6).
5. The sliding bearing structure of the hobbing cutter for breaking the extremely hard rock according to claim 1, characterized in that a crescent groove is formed on the side wall surface of the main shaft (4), and the wear-resistant material (18) is filled in the crescent groove.
6. The sliding bearing structure of the hob for breaking the extremely hard rock according to claim 1, characterized in that a bearing shoulder is arranged in the middle of the main shaft (4), thrust bearings (15) are mounted on both sides of the bearing shoulder of the main shaft (4), and the outer side wall surfaces of the two thrust bearings (15) are respectively supported on one side wall surface of the two bearing seats (6) close to each other.
7. The sliding bearing structure of the hobbing cutter for breaking the extremely hard rock according to claim 2, characterized in that spherical teeth (3) are distributed on the conical surface of the cutter shell (1), and flat teeth (2) are distributed on one end of the cutter shell (1) with larger outer diameter.
8. A sliding bearing structure of a hob for breaking rock of extremely hard rock according to claim 2, characterized in that a threaded sleeve (16) is installed in one end of the cutter housing (1) with larger outer diameter, and the second end cover (17) is installed in the threaded sleeve (16); end face sealing rings (10) are respectively lapped on the end faces, far away from each other, of the two bearing blocks (6), a second sealing ring (9) is in sealing fit between the first end cover (8) and one end face sealing ring (10), and a second sealing ring (9) is also in sealing fit between the second end cover (17) and the other end face sealing ring (10); the two ends of the main shaft (4) are respectively matched with a first sealing ring (7) in a sealing mode, one first sealing ring (7) is pressed between the first end cover (8) and the corresponding bearing bush (5), and the other first sealing ring (7) is pressed between the second end cover (17) and the corresponding bearing bush (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210149736.XA CN114576274B (en) | 2022-02-18 | 2022-02-18 | Sliding bearing structure of rock-breaking hob for extremely hard rock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210149736.XA CN114576274B (en) | 2022-02-18 | 2022-02-18 | Sliding bearing structure of rock-breaking hob for extremely hard rock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114576274A true CN114576274A (en) | 2022-06-03 |
| CN114576274B CN114576274B (en) | 2024-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210149736.XA Active CN114576274B (en) | 2022-02-18 | 2022-02-18 | Sliding bearing structure of rock-breaking hob for extremely hard rock |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002213248A (en) * | 2001-01-16 | 2002-07-31 | Nippon Soken Inc | Bearing device of turbocharger |
| WO2008030205A1 (en) * | 2006-09-05 | 2008-03-13 | Igor Aleksandrovich Kupchinsky | Drill bit provided with a sealed bearing support |
| CN201884033U (en) * | 2010-11-02 | 2011-06-29 | 北京中煤矿山工程有限公司 | Constant-pressure compound sealing structure of mining deep well rock breaking hob cutter |
| CN202148870U (en) * | 2011-07-21 | 2012-02-22 | 洛阳九久技术开发有限公司 | Three-ring hob device of raise boring machine |
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| CN109281684A (en) * | 2018-10-25 | 2019-01-29 | 北京中煤矿山工程有限公司 | A kind of anti-well drilling machine inserted tooth hob of quick-detachable sliding bearing |
| CN109488211A (en) * | 2018-10-25 | 2019-03-19 | 北京中煤矿山工程有限公司 | Anti- well drilling machine inserted tooth hob with hydraulic drilling |
| CN110331942A (en) * | 2019-07-23 | 2019-10-15 | 中交第三航务工程局有限公司 | A kind of hobboing cutter on clean-out machine for breaking extremely hard rock |
-
2022
- 2022-02-18 CN CN202210149736.XA patent/CN114576274B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002213248A (en) * | 2001-01-16 | 2002-07-31 | Nippon Soken Inc | Bearing device of turbocharger |
| WO2008030205A1 (en) * | 2006-09-05 | 2008-03-13 | Igor Aleksandrovich Kupchinsky | Drill bit provided with a sealed bearing support |
| CN201884033U (en) * | 2010-11-02 | 2011-06-29 | 北京中煤矿山工程有限公司 | Constant-pressure compound sealing structure of mining deep well rock breaking hob cutter |
| CN202148870U (en) * | 2011-07-21 | 2012-02-22 | 洛阳九久技术开发有限公司 | Three-ring hob device of raise boring machine |
| CN103352706A (en) * | 2013-05-30 | 2013-10-16 | 大连理工大学 | Method for designing center bigeminal hobs of heading machine |
| CN107076198A (en) * | 2014-10-24 | 2017-08-18 | 川崎重工业株式会社 | Floating bush bearing and ship exhaust steam turbine |
| CN206220866U (en) * | 2016-11-30 | 2017-06-06 | 洛阳九久科技股份有限公司 | A kind of anti-well hob-cutter structure of 12 cun of heavily loaded double containment |
| CN109281684A (en) * | 2018-10-25 | 2019-01-29 | 北京中煤矿山工程有限公司 | A kind of anti-well drilling machine inserted tooth hob of quick-detachable sliding bearing |
| CN109488211A (en) * | 2018-10-25 | 2019-03-19 | 北京中煤矿山工程有限公司 | Anti- well drilling machine inserted tooth hob with hydraulic drilling |
| CN110331942A (en) * | 2019-07-23 | 2019-10-15 | 中交第三航务工程局有限公司 | A kind of hobboing cutter on clean-out machine for breaking extremely hard rock |
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|---|---|
| CN114576274B (en) | 2024-03-26 |
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