CN101898161A - Thread-free floating type supporting bar - Google Patents
Thread-free floating type supporting bar Download PDFInfo
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- CN101898161A CN101898161A CN2009100721150A CN200910072115A CN101898161A CN 101898161 A CN101898161 A CN 101898161A CN 2009100721150 A CN2009100721150 A CN 2009100721150A CN 200910072115 A CN200910072115 A CN 200910072115A CN 101898161 A CN101898161 A CN 101898161A
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- support bar
- main body
- supporting bar
- bar main
- central tube
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Abstract
The invention relates to a thread-free floating type supporting bar, in particular to a construction member used for fixing a spiral propeller onto a coal mill barrel in a BBD steel ball coal mill. The invention solves the problems that the existing supporting bar is inconvenient for maintenance, has poor strength and is easy to break and compensatory is poor. The shaft sleeve of the supporting bar main body penetrates a hole opened on the side wall of a central tube and is fixedly connected with the central tube, one end of the supporting bar main body is inserted and arranged in one end of the supporting bar main body shaft sleeve outside the central tube, a disk spring is arranged in the other end of the supporting bar main body shaft sleeve inside the central tube, one end of the supporting bar main body is connected with the disk spring by contact, and the other end of the supporting bar main body shaft sleeve is connected with a gland by a connecting piece in a dismountable way. The invention has simple and feasible mounting, can be dismounted and can be repeatedly used; clearance compensation changes the stress state of the supporting bar, thus improving the strength of the supporting bar; and different axiality compensation between the spiral propeller and the barrel optimizes the working condition of the spiral propeller.
Description
Technical field
The present invention relates to a kind of support bar, be specifically related to be used in a kind of BBD low speed coal mill spiral propeller is fixed on member on the coal pulverizer cylindrical shell.
Background technology
One, the effect of support bar
Spiral propeller is the vitals (see figure 1) of carrying raw coal in the BBD low speed coal mill, and spiral propeller is fixed on the coal pulverizer cylindrical shell by four support bars, and when cylindrical shell rotated, moment of torsion was delivered to propeller by support bar, and propeller is rotated synchronously with cylindrical shell.In this process, the helical blade on the spiral propeller pushes cylindrical shell with raw coal.This shows the important function of support bar in the BBD low speed coal mill.
Two, the structure of existing support bar
For the axiality that guarantees spiral propeller center line and cylindrical shell center line meets the demands, must adjust the position of spiral propeller according to actual conditions during installation, the structure of former support bar is as shown in Figure 2.The end that support bar 11 is connected with spiral propeller central tube 12 is threaded, during installation, earlier axle sleeve 3 and central tube 12 are welded, outer nut 1 welds with axle sleeve 3, adjust the position of spiral propeller by rotation support bar 11 again with respect to cylindrical shell 17, after axiality meets the demands, tighten inner nut 2, and weld with axle sleeve 3.
Three, the deficiency of existing support bar existence
1, maintenance is inconvenient
When liner plate, hollow tube damage or the propeller self of coal pulverizer damage,, must pull out cylindrical shell to propeller in order to change and keep in repair impaired parts.Because support bar is one with the propeller weldering, can't not have the dismounting of damage, can only destructiveness dismantle-cut off support bar.When reinstalling, outer nut 1 originally, axle sleeve 3, inner nut 2 etc. also can't utilize again, must more renew, the adjustment program the when rejuvenate of laying equal stress on is installed.This process has not only been wasted an originally intact cover support bar, and wastes time and energy.
2, intensity difference
In BBD low speed coal mill when work,, support bar should bear the weight of spiral propeller, transmit again moment of torsion just spiral propeller rotate synchronously with cylindrical shell, so support bar bears axially and shock loading radially simultaneously, see shown in Figure 3.Axial load F
1, F
2The stress that produces is very little, radial load F
3Root at support bar produces maximal bending moment, so the stress of Chan Shenging is also maximum herein.On the other hand, the screw thread place is because the unexpected variation in cross section produces very big stress and concentrates, and this significantly reduces the static strength of support bar root and fatigue strength simultaneously.Use SOLIDWORKS and carry out stress analysis, diameter is that 62mm junction screw thread is the support bar of M62, when being subjected to the 200kg radial load, maximum stress is 116.1MPa, and under the equal operating mode, diameter is that the maximum stress that 62mm does not have a screw thread support bar only is to see Fig. 4 by 47MPa.This shows that screw thread is big to the influence of support bar intensity, this also is one of support bar major cause of failure.
3, compensatory poor
After initial installation is adjusted, the central tube weldering of support bar and spiral propeller is one, this work is carried out under the unloaded normal temperature of coal pulverizer, during the coal pulverizer operation, pack in the cylindrical shell 80～100 tons steel ball and raw coal, temperature surpasses 200 ℃ in the cylindrical shell, so after operation a period of time, reasons such as relative position variation owing to barrel distortion, liner plate the gap certainly will occur between support bar 11 and the shell liner 16.Under the gravity effect, spiral propeller will offset downward, and side-play amount equates with the gap.Because the existence in gap, to produce harmful shock and vibration when cylindrical shell and spiral propeller rotation, and after the gap acquires a certain degree, the gravity G that script is axially born by support bar, transfer to support bar radially, the radial load of this moment (is seen Fig. 5 a) than the original G/2 that increases; Increase (seeing Fig. 5 b) greatly than original gravity G under the extreme case, the radial load that this moment, support bar bore is increased to original 16～32 times, and this is another main cause of fracture.
In addition, the gap also will cause the malalignment of spiral propeller and cylindrical shell to increase, and cause improper contact the between helical blade 14 and the hollow tube 13, cause the life-span of blade and hollow tube greatly to be reduced; This malalignment also will shorten the service life of bearing 15.
Because the restriction of supporting bar structure can't be carried out any compensation and correction to the gap.
Summary of the invention
There is the problem of overhauling inconvenience, intensity difference, easy fracture and compensatory difference in the present invention in order to solve existing support bar, and then a kind of thread-free floating type supporting bar is provided.
The present invention solves the problems of the technologies described above the technical scheme of taking to be: thread-free floating type supporting bar of the present invention is by the support bar main body, support bar main body axle sleeve, disk spring, gland and at least two connectors constitute, described support bar body shaft cover passes hole that the central tube sidewall has and affixed with central tube, support bar main body one end is inserted into support bar main body axle sleeve one end that is positioned at the central tube outside, disk spring is installed in the support bar main body axle sleeve other end that is positioned at central tube inside, described support bar main body one end face is connected with the disk spring contact, and the support bar main body axle sleeve other end and the gland that are positioned at central tube inside removably connect by connector.
The invention has the beneficial effects as follows:
The present invention has structurally made the change of essence, makes support bar complicated and non-dismountable by original installation, and it is simple to become installation, detachable, reusable; The compensation in gap is changed the stress of support bar, thereby increased the intensity of support bar; To the compensation optimizing of malalignment between spiral propeller and the cylindrical shell working condition of spiral propeller, this is very favourable to the life-span of improving spiral propeller.
Concrete advantage of the present invention is mainly reflected in the following aspects:
One, owing to is that float, dismountable between support bar of the present invention and the axle sleeve, so when needs are pulled out propeller when overhauling outside the cylindrical shell, as long as the bolt that screws off on the gland can separate support bar with propeller, need not destroy any one part, and dismounting and install very simple and convenient.
Two, cancelled screw thread, avoided stress to concentrate, the static strength and the fatigue strength of support bar are greatly improved.The variation of structure has changed the position of support bar dangerouse cross-section, has reduced the moment of flexure that radial load produces, thereby the bulk strength of support bar is further improved.Be example with the 200kg radial load equally, the maximum stress of novel support bar is 43MPa only, and vision intensity is greatly improved.
Three, after support bar installed, disk spring was in state of applanation, and when the gap occurring between support bar and the liner plate, the disk spring elongation compensates the gap, thereby had stopped the generation of harmful shock and vibration.Because support bar withstands liner plate all the time,, and can not affact radially so angle of rake weight also acts on the axial of support bar all the time.This structural change the stress of support bar, reduced the maximum radial force that support bar may bear, from another angle the intensity of support bar is significantly improved.
Four, disk spring also has the malalignment of a pair of propeller of another one important function and cylindrical shell to compensate except can compensating the gap between support bar and the liner plate, sees Fig. 7 a, Fig. 7 b and Fig. 7 c.When the gap occurs, above the load P of disk spring
1With angle of rake weight G's and greater than the limit load P of following disk spring
2, the spring elongation above this moment, following spring still is in state of applanation, and propeller will offset downward.When the gap is arrived to a certain degree greatly, P
1+ G=P
2, reaching critical point, the gap continues to increase afterwards, and last lower spring extends simultaneously, and propeller no longer offsets downward.Gap length by can determine critical point to the design of spring the time makes it satisfy axiality requirement between propeller and the cylindrical shell, and this point is very important to protection helical blade 14, hollow tube 13 and bearing.
Description of drawings
Fig. 1 is the structural representation of spiral propeller; Fig. 2 be existing support bar structure and with the annexation schematic diagram of central tube 12; Fig. 3 is that existing support bar bears axially and the schematic diagram of shock loading radially simultaneously; Fig. 4 uses demonstration that SOLIDWORKS software carries out stress analysis to support bar figure as a result; Fig. 5 a is the force analysis figure behind the generation gap between support bar 11 and the shell liner 16 (radial load is than the original G/2 of increasing), and Fig. 5 b is the force analysis figure behind the generation gap between support bar 11 and the shell liner 16; Fig. 6 is a structural representation of the present invention; Fig. 7 a utilizes the present invention that spiral propeller is fixed on original state figure (P in the coal pulverizer cylindrical shell
1Be the load of superposed disk spring, P
2Load for the disk spring that is positioned at the bottom, G is the power that spiral propeller acts on pole point), Fig. 7 b is the state diagram when utilizing the present invention that spiral propeller is fixed on critical point δ in the coal pulverizer cylindrical shell, and Fig. 7 c is the state diagram when utilizing the present invention that spiral propeller is fixed on gap delta in the coal pulverizer cylindrical shell＞δ 1.
The specific embodiment
The specific embodiment one: as shown in Figure 6, the described thread-free floating type supporting bar of present embodiment is by support bar main body 21, support bar main body axle sleeve 22, disk spring 23, gland 24 and at least two connectors 25 constitute, described support bar main body axle sleeve 22 passes hole 12-1 that central tube 12 sidewalls have and affixed with central tube 12, support bar main body 21 1 ends are inserted into support bar main body axle sleeve 22 1 ends that are positioned at central tube 12 outsides, disk spring 23 is installed in support bar main body axle sleeve 22 other ends that are positioned at central tube 12 inside, described support bar main body 21 1 end faces are connected with disk spring 23 contacts, and support bar main body axle sleeve 22 other ends and the gland 24 that are positioned at central tube 12 inside removably connect by connector 25.Support bar main body 21 other ends are connected with the coal pulverizer cylinder inboard wall by liner plate.Spiral propeller is connected with the coal pulverizer cylindrical shell by four support bars of the present invention.
The specific embodiment two: as shown in Figure 6, the described connector 25 of present embodiment is bolts.So be provided with, be convenient to dismounting.Cancelled screw thread on the support bar, disk spring can be connected by bolt (connector 25) the compensation and the described gland 24 in gap between support bar and the shell liner, has dismoutability.Other composition and annexation are identical with the specific embodiment one.
The specific embodiment three: as shown in Figure 6, the described support bar main body 21 of present embodiment is made by Fine Steel Casting iron 45# steel or low-alloy steel Q345 material.Originally the support bar material is medium alloy steel 34CrNi3Mo, because the change of structure, present embodiment has not only improved intensity but also greatly reduce material cost.Other composition and annexation are identical with the specific embodiment one or two.
The specific embodiment four: as shown in Figure 6, the described disk spring 23 of present embodiment is made by the spring steel 50CrVA material that is adapted at using under the higher temperature.Through reasonably design, make reach infinite life in service life of disk spring, avoided since disk spring lost efficacy bring stop grinding consequence.Other composition and annexation are identical with the specific embodiment three.
Claims (4)
1. thread-free floating type supporting bar, it is characterized in that: described support bar is by support bar main body (21), support bar main body axle sleeve (22), disk spring (23), gland (24) and at least two connectors (25) constitute, described support bar main body axle sleeve (22) passes hole (12-1) that central tube (12) sidewall has and affixed with central tube (12), support bar main body (21) one ends are inserted into and are positioned at outside support bar main body axle sleeve (22) one ends of central tube (12), disk spring (23) is installed in and is positioned at inner support bar main body axle sleeve (22) other end of central tube (12), described support bar main body (21) one end faces are connected with disk spring (23) contact, are positioned at central tube (12) inner support bar main body axle sleeve (22) other end and gland (24) and removably connect by connector (25).
2. the described thread-free floating type supporting bar of root root claim 1, it is characterized in that: described connector (25) is a bolt.
3. root root claim 1 or 2 described thread-free floating type supporting bars, it is characterized in that: described support bar main body (21) is made by Fine Steel Casting iron 45# steel or low-alloy steel Q345 material.
4. the described thread-free floating type supporting bar of root root claim 3, it is characterized in that: described disk spring (23) is made by spring steel 50CrVA material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100721150A CN101898161A (en) | 2009-05-25 | 2009-05-25 | Thread-free floating type supporting bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100721150A CN101898161A (en) | 2009-05-25 | 2009-05-25 | Thread-free floating type supporting bar |
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| CN101898161A true CN101898161A (en) | 2010-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100721150A Pending CN101898161A (en) | 2009-05-25 | 2009-05-25 | Thread-free floating type supporting bar |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438109A (en) * | 2013-08-21 | 2013-12-11 | 北矿机电科技有限责任公司 | Self-lubricating bearing and adjusting and fixing device thereof, vertical mill |
| CN108545553A (en) * | 2018-06-22 | 2018-09-18 | 张家港市利佳纺织有限公司 | A kind of backlash compensation structure of spandex thread winch spool |
| CN114111439A (en) * | 2021-12-15 | 2022-03-01 | 中国科学院合肥物质科学研究院 | Clearance eliminating device for outer circle of target correcting lens and inner wall of gun barrel |
-
2009
- 2009-05-25 CN CN2009100721150A patent/CN101898161A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438109A (en) * | 2013-08-21 | 2013-12-11 | 北矿机电科技有限责任公司 | Self-lubricating bearing and adjusting and fixing device thereof, vertical mill |
| CN103438109B (en) * | 2013-08-21 | 2016-02-10 | 北矿机电科技有限责任公司 | The adjustment fixing device of self oiling bearing, self oiling bearing and vertical mill |
| CN108545553A (en) * | 2018-06-22 | 2018-09-18 | 张家港市利佳纺织有限公司 | A kind of backlash compensation structure of spandex thread winch spool |
| CN114111439A (en) * | 2021-12-15 | 2022-03-01 | 中国科学院合肥物质科学研究院 | Clearance eliminating device for outer circle of target correcting lens and inner wall of gun barrel |
| CN114111439B (en) * | 2021-12-15 | 2023-08-08 | 中国科学院合肥物质科学研究院 | Gap eliminating device for outer circle of target correcting mirror and inner wall of gun barrel |
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Effective date of abandoning: 20101201 |
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