CN207795848U - It is a kind of without the big cone angle double-row conical pivoting support of soft band - Google Patents
It is a kind of without the big cone angle double-row conical pivoting support of soft band Download PDFInfo
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- CN207795848U CN207795848U CN201820193326.4U CN201820193326U CN207795848U CN 207795848 U CN207795848 U CN 207795848U CN 201820193326 U CN201820193326 U CN 201820193326U CN 207795848 U CN207795848 U CN 207795848U
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- soft band
- inner ring
- soft
- band
- pivoting support
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The utility model discloses a kind of without the big cone angle double-row conical pivoting support of soft band,Including without soft band outer ring,Size it is equal without the first inner ring of soft band and without the second inner ring of soft band,No the first inner ring of soft band with without the second inner ring of soft band be symmetrical arranged and be attached by bolt,No the first inner ring of soft band combines to form inner ring structure with without the second inner ring of soft band,The no soft week with outer ring, there are two symmetrical and what is be obliquely installed rolls working face without soft band first inwardly,The outer circumferential setting soft rolling working face with outer ring of being and not being of inner ring structure is corresponding,And no soft band second rolls working face,The utility model is simple in structure,Reasonable design,It can make outer ring,Soft region is not present on the work raceway of first inner ring and the second inner ring,It is effectively increased the intensity of pivoting support lasso,Extend the service life of the pivoting support.
Description
Technical field
The utility model belongs to pivoting support technical field, and in particular to a kind of to be returned without the big cone angle double-row conical of soft band
Turn bearing.
Background technology
Big cone angle double-row conical pivoting support bearing is can to bear to integrate by what Internal and external cycle and rolling element etc. were constituted
The large size bearing of load can bear larger axial direction, radial load and tilting moment simultaneously.Pivoting support is applied to various works
Journey machinery and rotary table, are the important components of engineering machinery swing mechanism, are had to its raceway quenching quality very high
Requirement, generally require its surface to have higher hardness and wearability, and the material inside raceway still keeps original toughness group
It knits.For the method for the pivoting support generally use mid-frequency induction hardening of major diameter, since mid-frequency induction hardening has heating speed
Degree is fast, efficient, pollution-free and be widely used in the surface induction hardening of pivoting support.Traditional raceway face intermediate frequency sense
Although answering quenching mechanism type various, advantage is also different, can not solve the problems, such as the soft band of impewdance matching always.
Quench soft band be quenching apparatus inductor start between the initial position and end position of quenching existing one it is blind
Area, the soft region that raceway face caused by reheating is cracked without being formed by quenching in order to prevent.Due to
Existing technique can not avoid quenching the generation of soft band, and the direction of load is must take into consideration when pivoting support is installed, it is therefore desirable to
Soft band position is placed on non-staple bearing area as possible, prevents soft band and the transition in moving load bearing process of roller contact region
It wears and the entirety of pivoting support is caused to be scrapped, but such mode of operation limits the use scope of pivoting support, also drops
The low service life of pivoting support, increases the later maintenance cost of equipment, becomes and restricts China's pivoting support enterprise development
Key factor.
In the prior art in order to avoid occurring quenching soft band, after Workpiece clamping is fixed, mid-frequency induction hardening is utilized
Device carries out heating quenching along specific guide rail to pivoting support outer surface, and this working method needs to spend a large amount of prepare
Working time, working efficiency is low, can not solve present in big cone angle double-row conical pivoting support heat treatment process
Soft band problem, causes the service life of pivoting support bearing of short duration, increases enterprise's maintenance cost.
Invention content
In order to solve the above-mentioned technical problem the utility model, provides a kind of without soft band three-row cylinder roller pivoting support axis
It holds, the working surface of the Internal and external cycle of big cone angle double-row conical bearing is quenched using the utility model, solves biography
There is soft band in system large diameter pivoting support, improve the efficiency and quality of pivoting support heat treatment, be conducive to pivoting support
The extension of bearing service life.
Technical solution used by the utility model is：It is a kind of without the big cone angle double-row conical pivoting support of soft band, packet
Include without it is soft with outer ring, size it is equal without the first inner ring of soft band and without the second inner ring of soft band, without the first inner ring of soft band and nothing
The second inner ring of soft band is symmetrical arranged and is attached by bolt, and no the first inner ring of soft band to be formed with being combined without the second inner ring of soft band
Inner ring structure, the no soft week with outer ring, there are two symmetrical and what is be obliquely installed rolls working face, inner ring without soft band first inwardly
The outer circumferential setting soft rolling working face with outer ring of being and not being of structure is corresponding to roll working face without soft band second, without soft band
First rolling working face and without soft band second roll working face between rolling unit is installed.
The rolling unit includes the first retainer washer, roller, pillar and the second retainer washer, the outer diameter point of roller
Working face not being rolled with without soft band first and being in contact without the rolling working face of soft band second, the first retainer washer and second is kept
Frame washer is located at two endface positions of roller, the first retainer washer and the second retainer washer by through roller
The pillar at center is connected.
It is described without being provided through on the soft thickness direction with outer ring around without the equally distributed mounting hole in soft band outer ring axle center.
It is described to be more than without the soft thickness with outer ring with the total height after being combined without the second inner ring of soft band without the first inner ring of soft band.
It is described without soft band outer ring, without the first inner ring of soft band and without the second inner ring of soft band be 42GrMo materials, the material category
In unimach, there is high intensity and toughness, quenching degree is preferable, without apparent temper brittleness, after by surface hardening
The performance that pivoting support can be improved keeps bearing operation reliable and stable, extends its service life, reduce repair and safeguard at
This.
The utility model also provide a kind of outer ring without the big cone angle double-row conical pivoting support of soft band, the first inner ring with
And second inner ring process for quenching, include the following steps：
Step 1: the positioning of workpiece：The outer ring of pivoting support, the first inner ring, the second inner ring are horizontally arranged at machine respectively
On the workbench of bed, and it is fixed；
Step 2: determining the center location of workpiece：Distance measuring sensor is installed on machine tool chief axis, utilizes distance measuring sensor pair
The external peripheral surface of workpiece or the different location of inner circumferential surface carry out range measurement, the central coordinate of circle of workpiece are determined, by coordinate
Value is recorded and stored in machine tool control system, and start position, the final position of induction heater are determined according to the coordinate value
And the moving radius of induction heater；
Step 3: the heating and cooling of workpiece：In initial position, two sensing heatings being mounted on machine tool movement device
Device is located at leading zero's simultaneously, and the distance between two induction heaters are 2mm, and induction heater is quenched close to raceway face
When fiery, two induction heaters are powered simultaneously, and two induction heaters are from dead-center position respectively in the opposite direction with identical
Speed moves to terminal, and in moving process, two induction heaters move the midpoint of circular arc and the center of circle of workpiece keeps concentric,
When reaching home, two induction heaters stop mobile and two induction heaters at a distance of 2mm；In induction heater to raceway table
During face is heated, two cooling devices on lathe are mounted on movement locus same as two induction heaters
Heated raceway face is cooled down simultaneously, the heating of every bit and cooling time interval are homogeneous in raceway face
Deng；After two groups of induction heaters are heated to final position and withdraw raceway face, induction heater power-off stops heating,
After two cooling devices cool down raceway face in final position, raceway face is withdrawn, the entire of pivoting support is completed and quenches
Fiery process to get to without soft band outer ring, without the first inner ring of soft band, without the second inner ring of soft band.
Distance measuring sensor in the step 2 is that ultrasonic distance-measuring sensor, laser range sensor or infrared distance measurement pass
Sensor, control system are PLC programing systems.
Raceway face in the step 3 is that the first rolling working face or second roll working face.
Induction heater in the step 3 is intermediate frequency inductor, and heated current frequency is 2500-8000Hz, and induction adds
Hot device is 2-3mm at a distance from workpiece raceway face.
In the step 3, the cooling medium of cooling device is water, aqueous solution or mineral oil.
Wherein in step 1, it is to make the central axis of workpiece and workbench protect that workpiece, which is carried out horizontal positioned purpose,
It holds vertically, to make induction heater be moved in the same horizontal line always in the process of work, reduces staff
The time it takes in programming process both ensure that working efficiency or reduce the work difficulty of staff, and can make
Workpiece is heated and cooling uniform, in subsequent heating and cooling technique to reach the excellent properties in final products.
Wherein in step 2, the purpose that distance measuring sensor is arranged is to quickly find out the center of circle of workpiece, determine the center of circle
Actual coordinate value, in conjunction with workpiece raceway radius to be quenched to obtain the position of induction heater, it is fast in control system
The program for being incorporated into two induction heater movement locus of speed, reaches in quenching process, induction heater and surface to be quenched
Between the thick-and-thin purpose of spacing, be conducive to improve quenching efficiency and quenching quality, also for make workpiece rear
Continuous heating and cooling technique is heated and cooling uniform, to reach the excellent properties in final products.
Wherein step 3 be by two induction heaters leading zero's position simultaneously impewdance matching, in terminal encountered location
Impewdance matching simultaneously, from the off instead of traditional single induction heater, after the circle of working surface one, terminal and starting point it
Between existence time difference and existing soft band problem not will produce without soft band since the utility model heats and cooling is carried out at the same time
Region, therefore will not be cracked because of raceway face caused by reheating, also without the soft area by quenching formation
Domain.
Wherein in step 3, when quenching, two induction heaters are powered simultaneously, and two induction heaters are from dead-center position point
It is not moved to terminal with identical speed in the opposite direction, in moving process, the midpoint of two induction heaters movement circular arcs
Keep concentric with the center of circle of workpiece；The purpose being arranged in this way is：It can make induction heater in moving process apart from raceway table
The distance between face remains equal, induction heater be powered after, can to the quenching of raceway face, in quenching process,
Since the movement speed of induction heater is identical, the distance apart from raceway face is equal, can ensure two induction heaters
Move angle and apart from equal, keeps the time that raceway face every bit is heated equal, raceway hardened face is made to be heated evenly, from
And ensure that the hardness after quenching on every bit position is identical, improve the quality of quenching.
Wherein in step 3, during induction heater heats the raceway of pivoting support, it is mounted on lathe
On two cooling devices heated raceway face is carried out simultaneously with movement locus same as two induction heaters
Cooling, the time interval of the heating and cooling of every bit is equal on raceway；The purpose being arranged in this way is：Can with it is identical when
Between be spaced heated raceway face cooled down, improve cooling effect, keep raceway heated with it is cooling synchronous and uniform,
To be conducive to entirely quench the raising of quality.
Wherein in step 3, two induction heaters being mounted on machine tool movement device are located at leading zero's simultaneously, and
The distance between two induction heaters are 2mm；When reaching home, two induction heaters stop mobile and two inductions and add
Hot device is at a distance of 2mm；The purpose being arranged in this way be in order to prevent two induction heater hypotelorisms and cause equipment recurring structure
On collision, reduce the difficulty of operation, still further aspect is after being more than 2mm due to distance, due between two induction heaters
Distance far apart, the blind area of heating can be made to increase, when especially encountering large size bearing, heat can not pass to the blind of heating
The requirement of quenching is just not achieved then if the temperature of bearing herein is inadequate in area, and the quality of quenching is difficult to ensure, to influence
The quality of final products.
The beneficial effects of the utility model：
The utility model simple structure and reasonable design can make on the work raceway of outer ring, the first inner ring and the second inner ring
There is no soft regions, are effectively increased the intensity of pivoting support lasso, extend the service life of the pivoting support.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model pivoting support bearing；
Fig. 2 is the utility model pivoting support bearing without the soft schematic cross-section with outer ring；
Fig. 3 is the schematic cross-section of the utility model pivoting support bearing inner ring structure；
Fig. 4 is the schematic diagram that first inner ring of pivoting support bearing of the utility model quenches；
Fig. 5 is the sectional view before first inner ring of slewing bearing of the utility model quenches；
Fig. 6 is the schematic diagram that the pivoting support bearing outer ring of the utility model quenches；
Fig. 7 is the sectional view before the slewing bearing outer ring of the utility model quenches.
It is marked in figure：1, without soft band outer ring；1-1, outer ring；2, without the first inner ring of soft band；2-1, the first inner ring；3, without soft band
Second inner ring；3-1, the second inner ring；4, roller；5, the first retainer washer；6, the second retainer washer；7, pillar；8, it installs
Hole；9, working face is rolled without soft band first；9-1, first roll working face；10, working face is rolled without soft band second；10-1,
Two roll working face；11, induction heater；12, cooling device.
Specific implementation mode
Specific embodiment of the present utility model is described in further detail below in conjunction with attached drawing.
Embodiment one,
As shown in Figs. 1-3, a kind of without the big cone angle double-row conical pivoting support of soft band, including without soft band outer ring 1, size
It is equal-sized without the first inner ring of soft band 2 and without the second inner ring of soft band 3, without soft band outer ring 1, without the first inner ring of soft band 2 and without soft
The second inner ring of band 3 is 42GrMo materials, no the first inner ring of soft band 2 with without the second inner ring of soft band 3 be symmetrical arranged and pass through bolt
It is attached, no the first inner ring of soft band 2 combines to form inner ring structure with without the second inner ring of soft band 3, and the thickness of inner ring structure is more than
Without the soft thickness with outer ring 1, the no soft week with outer ring 1, there are two symmetrical and what is be obliquely installed rolls work without soft band first inwardly
Make face 9, the outer circumferential setting soft rolling working face with outer ring 1 of being and not being of inner ring structure is corresponding to roll work without soft band second
Make face 10, no soft band first rolls working face 9 and without rolling unit is symmetrically installed between the rolling working face 10 of soft band second, rolls
Moving cell includes the first retainer washer 5, roller 4, pillar 7 and the second retainer washer 6, the outer diameter of roller 4 respectively with without soft
Band first rolls working face 9 and rolls working face 10 without soft band second and is in contact, the first retainer washer 5 and the second retainer pad
Two endface positions that circle 6 is located at roller 4, the first retainer washer 5 and the second retainer washer 6 are by through roller
The pillar 7 at 4 centers is connected.
It is described without being provided through around without the equally distributed installation in soft 1 axle center of band outer ring on the soft thickness direction with outer ring 1
Hole 8.
As illustrated in figures 4-5, a kind of quenching side of the first inner ring 2-1 without the big cone angle double-row conical pivoting support of soft band
Method includes the following steps：
Step 1: the positioning of workpiece：First inner ring 2-1 of pivoting support is horizontally arranged on the workbench of lathe,
And it is fixed；
Step 2: determining the center location of workpiece：Distance measuring sensor is installed, distance measuring sensor is ultrasound on machine tool chief axis
Wave distance measuring sensor surveys the external peripheral surface of workpiece or the different location of inner circumferential surface into row distance using distance measuring sensor
Amount, determines the central coordinate of circle of workpiece, coordinate value is recorded and stored in machine tool control system, and control system is PLC programming controls
System processed determines the fortune of the start position of induction heater 11, final position and induction heater 11 according to the coordinate value
Dynamic radius；
Step 3: the heating and cooling of workpiece：In initial position, two sensing heatings being mounted on machine tool movement device
Device 11 is located at the positions leading zero's a simultaneously, and the distance between two induction heaters 11 are 2mm, and induction heater 11 is close
Raceway face, which is second to roll working face 10-1, and spacing is 2mm between raceway face, when quenching, two
Induction heater 11 is powered simultaneously, and heated current frequency is 2500Hz, belongs to intermediate frequency inductor, two induction heaters 11 from zero
The positions point a are respectively in the opposite direction with identical speed movement b to terminal, and in moving process, two induction heaters 11 are moved
The midpoint of dynamic circular arc and the center of circle of workpiece keep concentric, when reaching home the positions b, two induction heaters 11 stop moving and
Two induction heaters 11 are at a distance of 2mm；During induction heater 11 heats raceway face, it is mounted on lathe
Two cooling devices 12 with movement locus same as two induction heaters 11 simultaneously to heated raceway face into
Row cooling, the medium of cooling device 12 are water, and the time interval of the heating and cooling of every bit is equal in raceway face；Two groups
After induction heater 11 is heated to the positions terminal b and withdraws raceway face, induction heater 11 powers off, and stops heating, and two
After a cooling device 12 cools down raceway face in the positions terminal b, raceway face is withdrawn, the entire of pivoting support is completed and quenches
Fiery process is to get to without the first inner ring of soft band 2.
Embodiment two,
As shown in Figs. 1-3, a kind of without the big cone angle double-row conical pivoting support of soft band, including without soft band outer ring 1, size
It is equal-sized without the first inner ring of soft band 2 and without the second inner ring of soft band 3, without soft band outer ring 1, without the first inner ring of soft band 2 and without soft
The second inner ring of band 3 is 42GrMo materials, no the first inner ring of soft band 2 with without the second inner ring of soft band 3 be symmetrical arranged and pass through bolt
It is attached, no the first inner ring of soft band 2 combines to form inner ring structure with without the second inner ring of soft band 3, and the thickness of inner ring structure is more than
Without the soft thickness with outer ring 1, the no soft week with outer ring 1, there are two symmetrical and what is be obliquely installed rolls work without soft band first inwardly
Make face 9, the outer circumferential setting soft rolling working face with outer ring 1 of being and not being of inner ring structure is corresponding to roll work without soft band second
Make face 10, no soft band first rolls working face 9 and without rolling unit is symmetrically installed between the rolling working face 10 of soft band second, rolls
Moving cell includes the first retainer washer 5, roller 4, pillar 7 and the second retainer washer 6, the outer diameter of roller 4 respectively with without soft
Band first rolls working face 9 and rolls working face 10 without soft band second and is in contact, the first retainer washer 5 and the second retainer pad
Two endface positions that circle 6 is located at roller 4, the first retainer washer 5 and the second retainer washer 6 are by through roller
The pillar 7 at 4 centers is connected.
It is described without being provided through around without the equally distributed installation in soft 1 axle center of band outer ring on the soft thickness direction with outer ring 1
Hole 8.
As shown in fig. 6-7, a kind of outer ring 1-1 process for quenching without the big cone angle double-row conical pivoting support of soft band, packet
Include following steps：
Step 1: the positioning of workpiece：The outer ring 1-1 of pivoting support is horizontally arranged on the workbench of lathe, and will
It is fixed；
Step 2: determining the center location of workpiece：Distance measuring sensor is installed, distance measuring sensor is infrared on machine tool chief axis
Distance measuring sensor surveys the external peripheral surface of workpiece or the different location of inner circumferential surface into row distance using distance measuring sensor
Amount, determines the central coordinate of circle of workpiece, coordinate value is recorded and stored in machine tool control system, and control system is PLC programming controls
System processed determines the fortune of the start position of induction heater 11, final position and induction heater 11 according to the coordinate value
Dynamic radius；
Step 3: the heating and cooling of workpiece：In initial position, two sensing heatings being mounted on machine tool movement device
Device 11 is located at the positions leading zero's a simultaneously, and the distance between two induction heaters 11 are 2mm, and induction heater 11 is close
Raceway face, which is first to roll working face 9-1, and spacing is 3mm between raceway face, when quenching, two
Induction heater 11 is powered simultaneously, and heated current frequency is 5000Hz, belongs to intermediate frequency inductor；Two induction heaters 11 from zero
Point position is respectively in the opposite direction with identical speed movement b to terminal, and in moving process, two induction heaters 11 move
The midpoint of circular arc and the center of circle of workpiece keep concentric, and when reaching home the positions b, two induction heaters 11 stop movement and two
A induction heater 11 is at a distance of 2mm；During induction heater 11 heats raceway face, it is mounted on lathe
Two cooling devices 12 simultaneously carry out heated raceway face with movement locus same as two induction heaters 11
Cooling, the medium of cooling device 12 is mineral oil, in raceway face the heating of every bit be equal with the time interval cooled down；Two
After group induction heater 11 is heated to the positions terminal b and withdraws raceway face, induction heater 11 powers off, and stops heating,
After two cooling devices 12 cool down raceway face in the positions terminal b, raceway face is withdrawn, completes the entire of pivoting support
Quenching process is to get to without soft band outer ring 1.
Claims (3)
1. a kind of without the big cone angle double-row conical pivoting support of soft band, it is characterised in that：Including without soft band outer ring, size
It is equal without the first inner ring of soft band and without the second inner ring of soft band, no the first inner ring of soft band be symmetrical arranged without the second inner ring of soft band and
It is attached by bolt, no the first inner ring of soft band combines to form inner ring structure with without the second inner ring of soft band, without soft with outer ring
Week inwardly there are two symmetrical and what is be obliquely installed rolls working face without soft band first, the outer circumferential of inner ring structure be provided with
The no soft rolling working face with outer ring is corresponding to roll working face without soft band second, and no soft band first rolls working face and without soft band
Rolling unit is installed, rolling unit includes the first retainer washer, roller, pillar and the second guarantor between the second rolling working face
Frame washer is held, the outer diameter of roller rolls working face with without soft band first respectively and is in contact without the rolling working face of soft band second, the
One retainer washer and the second retainer washer are located at two endface positions of roller, and the first retainer washer and second protect
It holds frame washer by the pillar through roller centre to be connected, be provided through around without soft on the no soft thickness direction with outer ring
The equally distributed mounting hole in band outer ring axle center.
2. according to claim 1 a kind of without the big cone angle double-row conical pivoting support of soft band, it is characterised in that：Without soft
It is more than without the soft thickness with outer ring with the total height after being combined without the second inner ring of soft band with the first inner ring.
3. according to claim 1 a kind of without the big cone angle double-row conical pivoting support of soft band, it is characterised in that：Without soft
Band outer ring without the first inner ring of soft band and without the second inner ring of soft band is 42GrMo materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820193326.4U CN207795848U (en) | 2018-02-05 | 2018-02-05 | It is a kind of without the big cone angle double-row conical pivoting support of soft band |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820193326.4U CN207795848U (en) | 2018-02-05 | 2018-02-05 | It is a kind of without the big cone angle double-row conical pivoting support of soft band |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207795848U true CN207795848U (en) | 2018-08-31 |
Family
ID=63268946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820193326.4U Active CN207795848U (en) | 2018-02-05 | 2018-02-05 | It is a kind of without the big cone angle double-row conical pivoting support of soft band |
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| CN (1) | CN207795848U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108223566A (en) * | 2018-02-05 | 2018-06-29 | 洛阳新强联回转支承股份有限公司 | It is a kind of without the big cone angle double-row conical pivoting support of soft band |
| CN110285139A (en) * | 2019-07-01 | 2019-09-27 | 洛阳新强联回转支承股份有限公司 | A kind of super-huge double-row conical pivoting support of low friction |
| CN110285138A (en) * | 2019-07-01 | 2019-09-27 | 洛阳新强联回转支承股份有限公司 | A kind of super-huge double-row conical pivoting support with adjusting washer |
-
2018
- 2018-02-05 CN CN201820193326.4U patent/CN207795848U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108223566A (en) * | 2018-02-05 | 2018-06-29 | 洛阳新强联回转支承股份有限公司 | It is a kind of without the big cone angle double-row conical pivoting support of soft band |
| CN108223566B (en) * | 2018-02-05 | 2024-02-20 | 洛阳新强联回转支承股份有限公司 | Soft-belt-free large-cone-angle double-row tapered roller slewing bearing |
| CN110285139A (en) * | 2019-07-01 | 2019-09-27 | 洛阳新强联回转支承股份有限公司 | A kind of super-huge double-row conical pivoting support of low friction |
| CN110285138A (en) * | 2019-07-01 | 2019-09-27 | 洛阳新强联回转支承股份有限公司 | A kind of super-huge double-row conical pivoting support with adjusting washer |
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