CN108466038A - A kind of new automatic mine car Press Fit Device for Wheelset and wheel are to filling method - Google Patents
A kind of new automatic mine car Press Fit Device for Wheelset and wheel are to filling method Download PDFInfo
- Publication number
- CN108466038A CN108466038A CN201810709988.7A CN201810709988A CN108466038A CN 108466038 A CN108466038 A CN 108466038A CN 201810709988 A CN201810709988 A CN 201810709988A CN 108466038 A CN108466038 A CN 108466038A
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- Prior art keywords
- shaft
- wheel
- telescopic shaft
- jack
- hollow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims description 9
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000009434 installation Methods 0.000 claims description 6
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 235000014121 butter Nutrition 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims 1
- 239000003921 oil Substances 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
- B23P19/027—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same using hydraulic or pneumatic means
Abstract
The invention discloses new automatic mine car Press Fit Device for Wheelset, including pedestal, the both sides on pedestal top are symmetrically fixed with two telescopic shaft jack mounting bases, it is mounted on telescopic shaft jack in two telescopic shaft jack mounting bases, it is equipped with hollow oil cylinder jack on the inside of two telescopic shaft jack, the middle part of hollow oil cylinder jack is equipped with hollow shaft, telescopic shaft stretches into hollow shaft, the middle part on pedestal top is symmetrically fixed with two wheel shaft positioning seats, wheel shaft is installed on two wheel shaft positioning seats, the both sides of wheel shaft are cased with wheel pair, inner bearing is installed in inner bearing mounting groove, the outside of two wheels pair is equipped with outer bearing.The new automatic mine car Press Fit Device for Wheelset of this kind of the present invention, by being equipped with each one group of telescopic shaft jack and hollow oil cylinder on both sides, during press fitting, bearing, wheel are first put into designated position to, axis, then start telescopic shaft jack, wheel shaft is locked, restarts hollow oil cylinder and is once pressed, efficiency of assembling can be largely improved, is reduced labor intensity.
Description
Technical field
The present invention relates to mine car production technical field, specially new automatic mine car Press Fit Device for Wheelset.
Background technology
Mine car, also referred to as mini train are the main means of transport travelled in mine, in mine construction rail, for mini train
The wheel of walking, mine car is steel wheel.
Usually all it is own equipment department oneself assembling in mine, in order to realize the flat of mine car since mine car usage amount is big
Steady operation, the necessary specification of wheel installation of mine car, standard.
Since the track of mine construction is standard mine rail, the wheel of mine car is also usually standard-sized vehicle
Wheel, so the mine car of equipment department assembling is all the mine tram wheel of standard.
The press fitting of existing standard mine tram wheel, bearing, it is mainly by hand or simple and mechanical, do not realize automation, it is whole
Body, the prior art are that most of use is equipped with by hand, or is assembled using simple and mechanical auxiliary, and labor intensity is big, and efficiency is low,
It does not realize mass production, simultaneously as excessive is manually assembled, installation accuracy can be caused low, installation process is not changed inherently,
Mine tram wheel installation quality caused by meeting is relatively low.
Therefore we it is necessary to improvement is made to this.
Invention content
It being equipped with to solve of the existing technology use, or is assembled using simple and mechanical auxiliary by hand, labor intensity is big,
Efficiency is low, does not realize that the defect produced in enormous quantities, the present invention provide new automatic mine car Press Fit Device for Wheelset and wheel to peace
Dress method.
In order to solve the above technical problem, the present invention provides the following technical solutions：
New automatic mine car Press Fit Device for Wheelset provided by the invention, by pedestal, the wheel shaft positioning seat of the middle of the base, and
One group of jack assembly that pedestal both ends are respectively placed is constituted.
The jack assembly is horizontal positioned, and fixed part is set on the base, and telescopic movable part corresponds to bottom
Seat middle part.
The telescopic movable part is constituted by the telescopic shaft at center and with the hollow shaft being sleeved on outside telescopic shaft, telescopic shaft
It can individually activity with hollow shaft；The telescopic shaft of the jack assembly at the pedestal both ends, hollow shaft are coaxial line.
New automatic mine car Press Fit Device for Wheelset as described above, illustrate further for, the jack assembly by
One hollow oil cylinder jack and a telescopic shaft jack are constituted；The telescopic shaft is the telescopic shaft of telescopic shaft jack, empty
Mandrel is the hollow shaft of hollow oil cylinder jack；Telescopic shaft passes through hollow shaft, and corresponds to the middle of the base.
New automatic mine car Press Fit Device for Wheelset as described above, illustrates further as the bottom of the pedestal is equipped with
Lower margin, and lower margin is the zinc-plated adjustable foot of carbon steel；The telescopic shaft jack is fixed on pedestal by telescopic shaft jack mounting base
On, the both sides of telescopic shaft jack mounting base are equipped with reinforced seat；Hollow oil cylinder jack hollow oil cylinder jack mounting base is fixed
On pedestal.
New automatic mine car Press Fit Device for Wheelset as described above, illustrates further as the end of the telescopic shaft is set
There is internal thread.
New automatic mine car Press Fit Device for Wheelset as described above, illustrates further as the wheel shaft positioning seat is by extremely
Few two pack supports are fixed on the base, and each pedestal upper end, which is both provided with, props up wheel shaft arc groove, props up the center of wheel shaft arc groove
Line and the telescopic shaft, hollow shaft are coaxial line.
New automatic mine car Press Fit Device for Wheelset as described above illustrates further as the holder is riser, riser
Upper end setting prop up wheel shaft arc groove；It props up and is equipped with abrasion-proof rubber cushion in the slot of wheel shaft arc groove.
The wheel of new automatic mine car Press Fit Device for Wheelset provided by the invention to fill method, specifically as follows into
Row：
(1), bearing will be installed in the central shaft hole inside and outside wheel, axletree both ends is placed on and prop up wheel shaft arc
In slot, make axletree and telescopic shaft, the equal centring of hollow shaft.
(2), it is mounted with that the wheel of bearing is placed on the both sides of axletree by two.
(3), the telescopic shaft for starting the telescopic shaft jack of pedestal both sides, makes telescopic shaft sequentially pass through hollow shaft, axletree
Then interior bearing is docked with wheel shaft end head；The telescopic shaft of both sides holds out against axletree both ends.
(4), make bearing and axletree coaxial line.
(5) while starting the hollow shaft at both ends, so that hollow shaft is pushed wheel, the bearing at both ends, bearing is made to be inserted in wheel
Axis completes wheel to dress.
The wheel of new automatic mine car Press Fit Device for Wheelset as described above is to filling method, specifically, by inside and outside wheel two
In the central shaft hole of side after installation bearing, the coating butter between two bearings.
It is described that telescopic shaft is made to sequentially pass through hollow shaft, the bearing in axletree, then docked with wheel shaft end head；Specifically
The external screw thread of axletree end is inserted in for the internal thread that the end of, telescopic shaft is equipped with.
Compared with prior art, the present invention has the advantages that：
This kind of new automatic mine car Press Fit Device for Wheelset, by being equipped with each one group of telescopic shaft jack and hollow thousand on both sides
Bearing, wheel are first put into designated position to, axis, then start telescopic shaft jack, by wheel shaft lock by jin top during press fitting
Extremely, restart hollow jack to be once pressed, can largely improve efficiency of assembling, reduce labor intensity, convenient for real
Now produce in enormous quantities, improves installation quality.
Description of the drawings
Fig. 1 is the structural schematic diagram of the new automatic mine car Press Fit Device for Wheelset of the present invention；
Fig. 2 is the partial structural diagram of the new automatic mine car Press Fit Device for Wheelset of the present invention.
In figure：1, pedestal；2, telescopic shaft jack；3, telescopic shaft；4, hollow oil cylinder jack；5, wheel shaft positioning seat；6、
Telescopic shaft jack mounting base；7, hollow oil cylinder jack mounting base；8, hollow shaft；9, mine tram wheel；10, wheel shaft；11, inner shaft
It holds；12, inner bearing mounting groove；13, outer bearing mounting groove；14, outer bearing；15, lower margin.
Specific implementation mode
To make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand, with reference to
Specific implementation mode, the present invention is further explained.
As depicted in figs. 1 and 2, the both sides of new automatic mine car Press Fit Device for Wheelset, including pedestal 1,1 top of pedestal are symmetrical
Two telescopic shaft jack mounting bases 6 are fixed with, telescopic shaft jack is mounted in two telescopic shaft jack mounting bases 6
2, the inside of two telescopic shaft jack 2 is equipped with hollow oil cylinder jack 4, and hollow oil cylinder jack 4 passes through hollow oil cylinder thousand
Jin top mounting base 7 is fixedly mounted on the top of pedestal 1, and the middle part of hollow oil cylinder jack 4 is equipped with hollow shaft 8, and telescopic shaft is very heavy
The output end on top 2 is sequentially connected with telescopic shaft 3, and telescopic shaft 3 stretches into hollow shaft 8, and the middle part on 1 top of pedestal is symmetrically fixed with
Two wheel shaft positioning seats 5, are equipped with wheel shaft 10 on two wheel shaft positioning seats 5, and the both sides of wheel shaft 10 are cased with mine tram wheel 9, two
The inside of mine tram wheel 9 offers inner bearing mounting groove 12, and inner bearing 11, two mine tram wheels are equipped in inner bearing mounting groove 12
9 outside offers outer bearing mounting groove 13, and the outside of two mine tram wheels 9 is equipped with outer bearing 14, and outer bearing 14 is set in wheel
On axis 10.
Wherein, the bottom of pedestal 1 is equipped with lower margin 15, and lower margin 15 is the zinc-plated adjustable foot of carbon steel, convenient for each lower margin 15
It is adjusted, convenient for making pedestal 1 be horizontal.
Wherein, 10 end of wheel shaft is equipped with screw thread, the end of telescopic shaft 3 be equipped with the matched screw thread in 10 end of wheel shaft, make
Telescopic shaft 3 is combined by hollow oil cylinder jack 4 with the ends screw of wheel shaft 10, and two telescopic shafts 3 is made to be pressed wheel shaft 10
It is fixed.
Wherein, the centre position of inner bearing 11 and outer bearing 14 is coated with lubricating oil, and telescopic shaft is made to pass through hollow oil cylinder thousand
Jin top 4 ensures press fitting precision when the ends screw of wheel shaft 10 is combined while ensureing not damage screw thread.
Wherein, the both sides of telescopic shaft jack mounting base 6 are equipped with reinforced seat, keep telescopic shaft jack 2 more firm, ensure
Stability when work.
Wherein, wheel shaft positioning seat 5 and the contact position of wheel shaft 10 are equipped with abrasion-proof rubber cushion, prevent wheel shaft positioning seat 5 and wheel
Axis 10 rubs, and causes the abrasion of wheel shaft 10.
The wheel of new automatic mine car Press Fit Device for Wheelset provided by the invention to fill method, specifically as follows into
Row：
(1), bearing will be installed in the central shaft hole inside and outside wheel, axletree both ends is placed on and prop up wheel shaft arc
In slot, make axletree and telescopic shaft, the equal centring of hollow shaft.Meticulous meter will be carried out by propping up the height design of wheel shaft arc groove
It calculates, it is desirable that the central horizontal height one with telescopic shaft is to prop up the arc lowest point height calculation basis of wheel shaft arc groove
For：The central horizontal height of telescopic shaft subtracts axletree radius.Therefore, it is propped up in wheel shaft arc groove when axletree both ends are placed on
Afterwards, axletree and telescopic shaft, hollow shaft are coaxial.
(2), it is mounted with that the wheel of bearing is placed on the both sides of axletree by two.
(3), the telescopic shaft for starting the telescopic shaft jack of pedestal both sides, makes telescopic shaft sequentially pass through hollow shaft, axletree
Then interior bearing is docked with wheel shaft end head；The telescopic shaft of both sides holds out against axletree both ends.
(4), make bearing and axletree coaxial line.
(4) while starting the hollow shaft at both ends, so that hollow shaft is pushed wheel, the bearing at both ends, bearing is made to be inserted in wheel
Axis completes wheel to dress.
It should be noted that the present invention is new automatic mine car Press Fit Device for Wheelset, when specific works, lower margin is first adjusted
15, keep pedestal 1 horizontal, inner bearing 11 is installed in mine tram wheel 9, wheel shaft 10 is put on wheel shaft positioning seat 5, then will install interior
Mine tram wheel 9, the outer bearing 14 of bearing 11 are put on wheel shaft 10, and lubrication is coated in the centre position of inner bearing 11 and outer bearing 14
Oil starts telescopic shaft jack 2, telescopic shaft 3 is made to be combined with the ends screw of wheel shaft 10 by hollow oil cylinder jack 4,
Guarantee ensures press fitting precision while not damaging screw thread, close telescopic shaft jack 2, is ensureing what telescopic shaft jack 2 stopped
Under the premise of, start hollow press fitting oil 4, while outer bearing 14 being pressed into the outer bearing mounting groove 13 in mine tram wheel 9, by mine tram wheel
Corresponding position on 9 indentation wheel shafts 10, then be pressed completion, unclamp hollow oil cylinder jack 4 and telescopic shaft jack 2 successively,
It is recycled into subsequent work.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
When control box monitors that improper displacement occurs in car by elevator controlling mainboard or accelerometer, control box control
The power-off of electromagnet 4 release processed, branch rod 5 protruding promotion brake arm 1, braking under the action of spring 6 at 4 both ends of electromagnet
Arm 1 makes the clamping of safety tongs 2, the upper contract block group on safety tongs 2 as fulcrum using the hinged place with brake casing 8 under leverage
3 prevention cars move down, and the lower contract block group 7 on safety tongs 2 prevents car from moving up.
The above embodiment is used for illustrating the present invention, rather than limits the invention, in the spirit of the present invention
In scope of the claims, to any modifications and changes that the present invention makes, protection scope of the present invention is both fallen within.
Claims (9)
1. new automatic mine car Press Fit Device for Wheelset, which is characterized in that by pedestal, the wheel shaft positioning seat of the middle of the base and bottom
One group of jack assembly that seat both ends are respectively placed is constituted；
The jack assembly is horizontal positioned, and fixed part is set on the base, and telescopic movable part corresponds in pedestal
Portion；
The telescopic movable part is constituted by the telescopic shaft at center and with the hollow shaft being sleeved on outside telescopic shaft, telescopic shaft and sky
Mandrel can individually activity；The telescopic shaft of the jack assembly at the pedestal both ends, hollow shaft are coaxial line.
2. new automatic mine car Press Fit Device for Wheelset according to claim 1, which is characterized in that the jack assembly
It is made of a hollow oil cylinder jack and a telescopic shaft jack；The telescopic shaft is the telescopic shaft of telescopic shaft jack,
Hollow shaft is the hollow shaft of hollow oil cylinder jack；Telescopic shaft passes through hollow shaft, and corresponds to the middle of the base.
3. new automatic mine car Press Fit Device for Wheelset according to claim 1, which is characterized in that the bottom of the pedestal is set
There is lower margin, and lower margin is the zinc-plated adjustable foot of carbon steel；The telescopic shaft jack is fixed on bottom by telescopic shaft jack mounting base
On seat, the both sides of telescopic shaft jack mounting base are equipped with reinforced seat；Hollow oil cylinder jack hollow oil cylinder jack mounting base is solid
It is scheduled on pedestal.
4. new automatic mine car Press Fit Device for Wheelset according to claim 2, which is characterized in that the end of the telescopic shaft
Equipped with internal thread.
5. new automatic mine car Press Fit Device for Wheelset according to claim 1, which is characterized in that the wheel shaft positioning seat by
At least two groups holder is fixed on the base, and each pedestal upper end, which is both provided with, props up wheel shaft arc groove, props up in wheel shaft arc groove
Heart line and the telescopic shaft, hollow shaft are coaxial line.
6. new automatic mine car Press Fit Device for Wheelset according to claim 5, which is characterized in that the holder is riser,
The upper end setting of riser props up wheel shaft arc groove；It props up and is equipped with abrasion-proof rubber cushion in the slot of wheel shaft arc groove.
7. the wheel of the new automatic mine car Press Fit Device for Wheelset as described in claim 1-7 is to filling method, which is characterized in that press
Following steps carry out：
(1), bearing will be installed in the central shaft hole inside and outside wheel, axletree both ends is placed on and prop up wheel shaft arc groove
It is interior, make axletree and telescopic shaft, the equal centring of hollow shaft；
(2), it is mounted with that the wheel of bearing is placed on the both sides of axletree by two；Start the telescopic shaft jack of pedestal both sides,
So that telescopic shaft is sequentially passed through hollow shaft, the bearing in axletree, is then docked with wheel shaft end head；The telescopic shaft of both sides is to wheel
Axis both ends are held out against；
(3), make bearing and axletree coaxial line；
(4) while starting the hollow shaft at both ends, so that hollow shaft is pushed wheel, the bearing at both ends, bearing is made to be inserted in axletree, it is complete
At wheel to dress.
8. the wheel of new automatic mine car Press Fit Device for Wheelset as claimed in claim 7 is to filling method, which is characterized in that by vehicle
In central shaft hole inside and outside wheel after installation bearing, the coating butter between two bearings.
9. the wheel of new automatic mine car Press Fit Device for Wheelset as claimed in claim 7 is to filling method, which is characterized in that described
So that telescopic shaft is sequentially passed through hollow shaft, the bearing in axletree, then docked with wheel shaft end head；Specifically, telescopic shaft
The internal thread that end is equipped with is inserted in the external screw thread of axletree end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810709988.7A CN108466038A (en) | 2018-07-02 | 2018-07-02 | A kind of new automatic mine car Press Fit Device for Wheelset and wheel are to filling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810709988.7A CN108466038A (en) | 2018-07-02 | 2018-07-02 | A kind of new automatic mine car Press Fit Device for Wheelset and wheel are to filling method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108466038A true CN108466038A (en) | 2018-08-31 |
Family
ID=63259755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810709988.7A Pending CN108466038A (en) | 2018-07-02 | 2018-07-02 | A kind of new automatic mine car Press Fit Device for Wheelset and wheel are to filling method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108466038A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3810293A (en) * | 1972-09-08 | 1974-05-14 | M Brandenburgsky | Horizontal hydraulic press |
| CN201257586Y (en) * | 2008-08-08 | 2009-06-17 | 鄂州市合强机械发展有限公司 | Motor train set train double head oil cylinder wheel pair pressing machine |
| CN101653907A (en) * | 2009-09-14 | 2010-02-24 | 喻国锋 | Railway full-automatic bearing press |
| RU2402414C1 (en) * | 2009-05-13 | 2010-10-27 | Открытое акционерное общество Научно-исследовательский и конструкторско-технологический институт подвижного состава (ОАО "ВНИКТИ") | Method of mounting railway wheel pairs |
| CN102294580A (en) * | 2011-08-05 | 2011-12-28 | 鄂州市合强机械发展有限公司 | Central hole positioning wheel pair press mounting machine |
| CN202622304U (en) * | 2012-06-26 | 2012-12-26 | 鄂州市合强机械发展有限公司 | Bearing press fitting machine |
| CN204711532U (en) * | 2015-06-30 | 2015-10-21 | 范娜 | A kind of Press Fit Device for Wheelset |
| CN208663003U (en) * | 2018-07-02 | 2019-03-29 | 四川广旺能源发展（集团）有限责任公司机械制造分公司 | A kind of new automatic mine car Press Fit Device for Wheelset |
-
2018
- 2018-07-02 CN CN201810709988.7A patent/CN108466038A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3810293A (en) * | 1972-09-08 | 1974-05-14 | M Brandenburgsky | Horizontal hydraulic press |
| CN201257586Y (en) * | 2008-08-08 | 2009-06-17 | 鄂州市合强机械发展有限公司 | Motor train set train double head oil cylinder wheel pair pressing machine |
| RU2402414C1 (en) * | 2009-05-13 | 2010-10-27 | Открытое акционерное общество Научно-исследовательский и конструкторско-технологический институт подвижного состава (ОАО "ВНИКТИ") | Method of mounting railway wheel pairs |
| CN101653907A (en) * | 2009-09-14 | 2010-02-24 | 喻国锋 | Railway full-automatic bearing press |
| CN102294580A (en) * | 2011-08-05 | 2011-12-28 | 鄂州市合强机械发展有限公司 | Central hole positioning wheel pair press mounting machine |
| CN202622304U (en) * | 2012-06-26 | 2012-12-26 | 鄂州市合强机械发展有限公司 | Bearing press fitting machine |
| CN204711532U (en) * | 2015-06-30 | 2015-10-21 | 范娜 | A kind of Press Fit Device for Wheelset |
| CN208663003U (en) * | 2018-07-02 | 2019-03-29 | 四川广旺能源发展（集团）有限责任公司机械制造分公司 | A kind of new automatic mine car Press Fit Device for Wheelset |
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